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Journal of the Korea Academia-Industrial cooperation Society
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The Korea Academia-Industrial cooperation Society
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Volume & Issues
Volume 17, Issue 8 - Aug 2016
Volume 17, Issue 7 - Jul 2016
Volume 17, Issue 6 - Jun 2016
Volume 17, Issue 5 - May 2016
Volume 17, Issue 4 - Apr 2016
Volume 17, Issue 3 - Mar 2016
Volume 17, Issue 2 - Feb 2016
Volume 17, Issue 1 - Jan 2016
Selecting the target year
Design and fabrication of a 300A class general-purpose current sensor
Park, Ju-Gyeong ; Cha, Guee-Soo ; Ku, Myung-Hwan ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 1~8
DOI : 10.5762/KAIS.2016.17.6.1
Current sensors are used widely in the fields of current control, monitoring, and measuring. They have become more popular with the increasing demand for smart grids in a power network, generation of renewable energy, electric cars, and hybrid cars. Although open loop Hall effect current sensors have merits, such as low cost, small size, and weight, they have low accuracy. This paper describes the design and fabrication of a 300A open loop current sensor that has high accuracy and temperature performance. The core of the current sensor was calculated numerically and the signal conditioning circuits were designed using circuit analysis software. The characteristics of the manufactured open loop current sensor of 300 A class was measured at currents up to 300 A. According to the test of the current sensor, the accuracy error and linearity error were 0.75% and 0.19%, respectively. When the temperature compensation was carried out with the relevant circuit, the temperature coefficients were less than
at temperatures between
Development of High Purity Purification Method of Chondroitin Sulfate Extracted from Skate Cartilage
Jeong, Kap-Seop ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 9~17
DOI : 10.5762/KAIS.2016.17.6.9
A purification method was established for high-purity chondroitin sulfate from skate cartilage. Hydrolytic extraction of skate backbone cartilage was investigated with the proteases alcalase and protamex, and the extraction contents of chondroitin sulfate were measured with several physicochemical processes. The yield of extract from skate cartilage with
concentration was 23.3% with 2% alcalase hydrolysis, which was decreased to 8.47% and 3.37% with the first and second additional ethanol purifications, respectively. The yield was 16.62% with one ethanol purification after hydrolysis with a mixture of 1% alcalase and 1% protamex. The content of chondroitin sulfate was measured as 39.88-45.08% with different ratios of ethanol solvent. The content was 42.92% at a solvent ratio of 1:1 with alcalase protease and 45.08% with a ratio of 1:2 using a protease mixture of alcalase and protamex. The molecular weight range of chondroitin sulfate was about 110-310 thousand Da, and the purity of chondroitin sulfate was 24.87-49.92% with a mixture of alcalase and protamex in GPC analysis. The maximum purity of chondroitin sulfate was 53.93% after ultrafiltration. The odor strength of chondroitin sulfate was decreased by 33% and 38% after ethanol purification and additional filtration with activated carbon, respectively. The odor concentration of ammonia and TMA from chondroitin sulfate was decreased by 52.1% and 37.89% with activated carbon filtration and two ethanol purifications, respectively, but it was necessary to eliminate the odor components efficiently using additional physicochemical processes.
Performance Analysis of the Flooded Refrigerant Evaporators for Large Tonnage Compression-Type Refrigerators Using Alternative Refrigerants
Kim, Nae-Hyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 18~25
DOI : 10.5762/KAIS.2016.17.6.18
Enhanced tubes are used widely in the evaporators of large tonnage compression-type refrigerators. The evaporators consist of tube bundles, and the refrigerant properties are dependent on the locations in the tube bundles. In particular, the saturation temperatures of low pressure refrigerants (R-11, R-123) are strongly dependent on the locations due to the saturation temperature-pressure curve characteristics. Therefore, for the proper design of evaporators, local property predictions of the refrigerants are necessary. In this study, a computer program that simulates the flooded refrigerant evaporators was developed. The program incorporated theoretical models to predict the refrigerant shell-side boiling heat transfer coefficients and pressure drops across the tube bundle. The program adopted an incremental iterative procedure to perform row-by-row calculations over the specified incremental tube lengths for each water-side pass. The program was used to simulate the flooded refrigerant evaporator of the "T" company operating with R-123, which yielded satisfactory results. The program was extended to predict the performance of the flooded refrigerant evaporator operating with R-11, R-123, and R-134a. The effects of bundle aspect ratio are investigated.
The Study of Reliability Based Optimization Design for Connection
Shin, Soo-Mi ; Yun, Hyug-Gee ; Kim, Hye-Min ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 26~32
DOI : 10.5762/KAIS.2016.17.6.26
Usually, there are many uncertainties regarding the error of an assumed load, material properties, member size, and structure analysis in a structure, and it may have a direct influence on the qualities of optimal design of structures. Probabilistic analysis has developed rapidly into a desirable process and structural reliability analysis is an increasingly important tool that assists engineers to consider uncertainties during the design, construction and life of a structure to calculate its probability of failure. This study deals with the applications of two optimization techniques to solve the reliability-based optimization problem of structures. The reliability-based optimization problem was formulated as a minimization of the structural volume subject to the constraints on the values of componential reliability index determined by the AFOSM approach. This presented method may be a useful tool for the reliability-based design optimization of structures.
Developing Stereo-vision based Drone for 3D Model Reconstruction of Collapsed Structures in Disaster Sites
Kim, Changyoon ; Lee, Woosik ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 33~38
DOI : 10.5762/KAIS.2016.17.6.33
Understanding of current features of collapsed buildings, terrain, and other infrastructures is a critical issue for disaster site managers. On the other hand, a comprehensive site investigation of current location of survivors buried under the remains of a building is a difficult task for disaster managers due to the difficulties in acquiring the various information on the disaster sites. To overcome these circumstances, such as large disaster sites and limited capability of rescue workers, this study makes use of a drone (unmanned aerial vehicle) to effectively obtain current image data from large disaster areas. The framework of 3D model reconstruction of disaster sites using aerial imagery acquired by drones was also presented. The proposed methodology is expected to assist fire fighters and workers on disaster sites in making a rapid and accurate identification of the survivors under collapsed buildings.
Estimation of Modification Factor for Scale Effect of the Front of Flood Wave Propagation
Jeong, Seok-il ; Kim, Soo young ; Lee, Seung Oh ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 39~44
DOI : 10.5762/KAIS.2016.17.6.39
Recently, there has been increasing concern regarding the collapse of hydraulic structures due to abnormal climate conditions. Therefore, numerous studies of the collapse of hydraulic structures have been carried out. In particular, the velocity of the propagation of a flood wave-front is important for predicting the inundation safety and establishing an EAP (Emergency Action Plan). Although many hydraulic tests have been conducted for precise predictions of a flood wave-front, the scale effect from downsizing has not considered. In this study, the relationships between surface tension and the concentration of surfactant, between surface tension and the velocity of flood wave propagation, and between surface tension and the Weber Number were derived through hydraulic tests using a surfactant and image analysis equipment. Based on these relations, the modification factor for the scale effect of the front of flood wave propagation was suggested. The results highlight the necessity of a modification factor when the Weber Number is lower than 12.2, but the scale effect can be ignored when the Weber Number over 12.2.
A Research on Meaning of Conflict Experience in Cooperative Learning Activity of Pre-service Early Childhood Teachers
Ma, Ji-sun ; An, Ra-ri ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 45~52
DOI : 10.5762/KAIS.2016.17.6.45
The purpose of this study was to investigate the meaning of conflict experience in cooperative learning activities of pre-service early childhood teachers. The subjects were 85 pre-service early childhood teachers in W university. The data were collected through unstructured interviews and journal writings of the participants. The study results were as follow. First, pre-service early childhood teacher's conflict experiences in cooperative activity are team meeting, fair participation and evaluation, and conflict of the personal relations. Second, pre-service early childhood teacher's conflict resolution experiences in cooperative activity are autonomy of the team meeting time, reflective thinking, sentimental support, recognition of others, and solving problems by the time spending together. Third, the meanings of conflict experience in cooperative activity are formation of felt responsibility, self-growth through consideration of others, reciprocity, and recognition of the meaning of cooperation.
A Study on the Effects of Lifelong Educator's Emotional Intelligence on Job Performance
Bang, Hee-Bong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 53~60
DOI : 10.5762/KAIS.2016.17.6.53
This study examined the data from 300 Daejeon and Chungnam Province's lifelong educators to establish the mediated effects of emotional intelligence on job performance and the influential relation between them. A research model and hypothesis was conducted from preliminary research, and the main data was brought into statistical analysis with the SPSS 20.0. The statistical analysis was divided into frequency, primary factors, and reliability; the tools used were the Varimax rotation factor analysis, and Cronbach's alpha coefficient. The analysis was also performed using the Pearson correlation coefficient, where the hypothesis was proven through regression analysis. The results showed that first, emotional intelligence and all of its sub factors have a positive influence on job performance. Second, job satisfaction, a factor shown in emotional intelligence and job performance, appeared to have mediating effects on self-awareness, self-management, social recognition, and relationship management. The results suggest that systematic training and development programs for improving emotional intelligence will be needed to build the competence of lifelong educators.
Simulation analysis of AGV introduction in the convenience store logistics distribution centers
Kim, Jeonghoon ; Kim, Younjin ; Lee, Hongchul ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 61~69
DOI : 10.5762/KAIS.2016.17.6.61
Since 2000, the market of convenient stores in Korea has developed rapidly due to the explosive growth in single households but it still consists mainly of manual work due to the nature of the domestic industry. Hence the explosive increase in demand in the market is mostly due to workers. Therefore, the research aimed at encouraging efficiency via automation, which is carried out in manufacturing, such as electronic, cars and so on, is inadequate. This study performed a feasibility analysis of investment for introducing an automated system on brand A, which is domestic famous convenience store company. Productivity growth according to the introduction of an automated guided vehicle and the cost-benefits was studied with using a simulation for the picking process, which is most personnel and time consuming. As a result, the simulation showed that the equipment AGV introduced for choosing the process has the effects of cost saving and increased time efficiency for performing manual labor. Furthermore, appropriate numbers of AGV were forecasted considering the capacity of the distribution Center in the brand A convenient store, which has been growing steadily. There are increasing numbers of worker labor costs in the distribution industry these days. Before building a large new automate center, it is expected to provide a good information to investors who are considering increasing productivity through partial automation of each of unit process to achieve some cost reduction.
The Effect of Integrated Recreation Program on Mood State, Flexibility and Stress of Elderly Women
Park, In-Sook ; Kim, Nam Cho ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 70~80
DOI : 10.5762/KAIS.2016.17.6.70
This study was conducted to investigate the effects of an integrated recreation program on mood states, flexibility, and stress of elderly women. The integrated recreation program was applied to dance as a physical activity and songs and art as emotional activities in consideration of the characteristics of the elderly activities. The subjects were 50 elderly women aged 65 years or older who reside in K-do. The examination period was December 2 in 2014 to February 17 in 2015, during which time mood states, flexibilities, density of the salivary cortisol, variations in heartbeats, and stress were measured. The integrated recreation program had positive effects on mood, flexibility and stress reduction in elderly women. Based on these results, the integrated recreation program is considered to increase mood states and flexibility of elderly women while lowering stress. Therefore, the integrated recreation program developed in this study not only helps the physical and mental health of elderly women, but can also be widely utilized as a health promotion program for the elderly.
Quality of Life in Chungcheong area University Students according to their Sensory Processing Intervention
Lee, Ji-Hyun ; Lee, Tae-Yong ; Kim, Young-Ran ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 81~88
DOI : 10.5762/KAIS.2016.17.6.81
This research investigated the sensory processing ability and selected subjects who had sensory processing problems, and divided the subjects into an experimental group and control group. The experimental group was educated with sensory processing intervention on the activities of daily living to determine its influence on the quality of life. The study was based on 230 university students with similar majors in 3 universities of Chungcheong area in the beginning of May, 2013. From here, 32 subjects who had issues with their sensory processing ability were selected. The 230 students were given a survey on the quality of life, individual characteristics, and sensory processing ability. Later, the 32 subjects who had problems with their sensory processing ability were divided into an experimental group and control group. The control group performed sensory processing intervention, whereas the control group did not. After the sensory processing intervention method for 6 weeks, the quality of life was re-evaluated. As a result, the total score of the quality of life after intervention was 98.69 in the experimental group and 84.81 in the control group (p=0.001). The physical score was 16.43 in the experimental group and 14.64 in the control group (p=0.008). The psychological score was 14.71 in the experimental group and 11.75 in the control group (p<0.001). The social score was 14.67 in the experimental group and 13.17 in the control group (p=0.032). The environment score was 14.66 in the experimental group and 12.34 in the control group (p=0.006). The experimental group showed a significant increase in all areas of the quality of life, whereas the control group did not. Through this result, it can be seen that a sensory processing intervention method in daily life can increase the quality of life for subjects with problems in sensory processing ability. Overall, it will be necessary to apply a treatment of various sensory intervention programs for adults and promote a better quality of life.
Study of shortest time artillery position construction plan
Ahn, Moon-Il ; Choi, In-Chan ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 89~97
DOI : 10.5762/KAIS.2016.17.6.89
This paper addresses the problem of the construction planning of artillery positions, for which we present an optimization model and propose a heuristic algorithm to solve problems of practical size. The artillery position construction plan includes the assignment of engineers to support the artillery and the schedule of the support team construction sequence. Currently, in the army, managers construct the plan based on their experience. We formulate the problem as a mixed integer program and present a heuristic that utilizes the decomposition of the mixed integer model. We tested the efficacy of the proposed algorithm by conducting computational experiments on both small-size test problems and large-size practical problems. The average optimality gap in the small-size test problem was 6.44% in our experiments. Also, the average computation time to solve the large-size practical problems consisting of more than 200 artillery positions was 79.8 seconds on a personal computer. The result of our computational experiments shows that the proposed approach is a viable option to consider for practical use.
The effect of group sociality play in sociality of autistic adolescent
Woo, Hee-Soon ; Won, Sung-Yoon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 98~105
DOI : 10.5762/KAIS.2016.17.6.98
Group play for sociality is a therapeutic method involving a mixture of various factors, such as targeted activities, perceptions, and physical mobility required in daily life, through group activities to encourage self-expression for the purpose of facilitating sociality. This study was conducted in order to verify its effects by applying it to autistic adolescents who lack communicative ability with others and ultimately to improve their interpersonal relationships and sociality. This study applied a single pre- and post-test experiment design to 8 autistic adolescents with lack of sociality who use a daycare center in Daejeon. The group play for sociality program consisted of two sessions a week for 7 weeks from October to December 2013 for a total of 14 sessions. The sociality of the adolescents before and after the intervention was analyzed by the Wilcoxon signed-rank test. As a result of the study, the total grades of the E-CLAC and social maturity test showed significant changes from
, respectively. In detail, there were significant changes in the sub-items, such as adjustment in group, following guidance, and increasing behavioral frequency. In conclusion, it was shown that the combined effect of the group activities, including group play for sociality and play activities taking into consideration the developmental stage of the participants, led to a significant improvement in the sociality of the autistic adolescents.
Differences in the Direct Medical Expenditures among Physical Activity Levels of the Community Residents
Kwon, Wook-Dong ; Ko, Wisug ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 106~112
DOI : 10.5762/KAIS.2016.17.6.106
The purpose of this study was to examine the differences in the direct medical expenditure of community residents according to their physical activity level. The quota sampling method was used to select samples from a youth community center, senior center, community cultural center, and community recreational sports center in G city in Gyeongbuk-do. Of the 773 questionnaires distributed, 716 were completed. The questionnaires consisted of the demographic characteristics, regular exercise and physical activity levels, health status and medical costs. While the beneficial effect of regular exercise and physical activity on dental costs was not (significant), its effect on the costs of visiting hospital services was (significant). The mean differences in the total monthly direct medical expenditures on outpatient services and medicine for those with very high, high, moderate, low, and very low levels of physical activity were 7,500, 26,299, 47,517, 9,314, and 9,9978 won, respectively. The result of this study supported the findings of previous studies that regular exercise and physical activity. are not associated with the reduction of medical expenditure.
Knowledge and Performance Level of Infection Control Guidelines on Indwelling Urinary Catheter, Central Venous Catheter and Ventilator Among Intensive Care Nurses
Ha, Hyun-Jung ; Park, Jung-Ha ; Kim, Myung-Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 113~120
DOI : 10.5762/KAIS.2016.17.6.113
The purpose of this study is to identify the knowledge of and adherence to the infection control guidelines for indwelling urinary catheters, central venous catheters and ventilators among intensive care nurses. The subjects were 175 intensive care nurses working in 2 upper general hospitals and 3 general hospitals. Data were collected from July 1 to July 31, 2013. The collected data were analyzed by descriptive statistics, t-test and ANOVA using SPSS 18.0 for Windows. The mean scores of the knowledge of the infection control guidelines on indwelling urinary catheters, central venous catheters and ventilators were 0.87, 0.82 and 0.82 points, respectively. The average scores for the adherence to the infection control guidelines for indwelling urinary catheters, central venous catheters and ventilators were 4.18, 4.04 and 4.07 points, respectively. Statistically significant correlations were found between the knowledge of and adherence to the infection control guidelines for indwelling urinary catheters (r=.72, p<.00), central venous catheters (r=.54, p<.001) and ventilators (r=.30, p<.001). The knowledge of and adherence to the infection control guidelines for indwelling urinary catheters differed significantly according to gender, educational status, total career, number of patients, type of hospital, and attendance of seminar. The knowledge of and adherence to the infection control guidelines for central venous catheters differed significantly according to educational status, total career, number of patients, type of hospital, and attendance of seminar. The knowledge level of the infection control guidelines for the ventilator differed significantly according to the total career. The results of this study indicate that education and training programs for improving the knowledge of adherence to the infection control guidelines should be developed.
The Effects of CPR Education Program for Middle-aged Women
Jeong, Eun-Young ; No, Ji-Young ; Kong, Jeong-Hyeon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 121~128
DOI : 10.5762/KAIS.2016.17.6.121
This study was conducted to examine the effect of a CPR education program on middle-aged women's knowledge of and attitude toward CPR. It is a quasi-experimental study using a non-equivalent control group. 58 middle aged women who participated in a vocational education program in S city were divided into the experimental group (n=29) and control group (n=29). The experimental group participated in the CPR education program once a week for 4 weeks. The data collected were analyzed using the SPSS program, frequency, proportion, chi-square test, and paired t-test. After the application of the CPR education program, the experimental group showed a significantly significant increase in their knowledge (t=10.39, p<.001) and attitude (t=8.94, p<.001). The CPR education program improved the middle-aged women's knowledge of and attitude toward CPR.
The Comparative Study on Incentive System for Integrated Design of Low-Energy Buildings
Lee, Byungyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 129~139
DOI : 10.5762/KAIS.2016.17.6.129
The purpose of this paper was to comparatively investigate the efficient building incentives in Korea and foreign countries and to seek strategies to enhance low energy building integrated design market infrastructure in Korea. The structure of incentive policies were composed of four main component: 1) types of financial aids and beneficiaries, 2) energy performance criteria and verification methods, 3) supports for low energy building integrated design, and 4) funding sources for incentive programs. Every overseas incentive program has adopted a design team incentive along with building owners incentive and the range of target buildings have been extended from new construction to remodeling projects. The main system of the program is the performance standard through which projects were investigated and the level of incentive are decided. Initially, the integrated performance has been investigated through simulation methods, but the construction performance evaluation and energy monitoring methods are emerging. In addition, the direct support and educational support for integrated design has been provided to enhance the foundation of relative markets. Financial funding is also a key component of the program and more aggressive funding strategies have been adopted.
Self-Efficacy According to Economic Activities of the Disabled
Kim, Jeong-ok ; Kang, cha-sun ; Park, Jeong-hwan ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 140~146
DOI : 10.5762/KAIS.2016.17.6.140
A survey was conducted of the total of 57 adults with disabilities from 60 years old to more than 20 years old residing in Jeju Island in which they were interviewed three times in May 2015. Supplementary data was provided by one of the male adults with disability who acts as a lecturer and helped to improve our awareness of the disabilities. The following conclusions were drawn from this research: First, as regards the effect of the economic activity of the disabled on their self-efficacy, their economic activity does not have any significant effect on their self-regulating efficacy and task difficulty preference, but does have an effect on their self-confidence. Third, according to the
verification on the differences in the self-efficacy of the disabled depending on their economic activity, employment (M=23.48, p<.04) and lecturer activities (M=22.06, p<.04) (had a greater effect?) than unemployment (M=18.93, p=<.04) but no difference between their employment and lecturer activities was found.
Metabolic Syndromes Improvement and Its Related Factors among Health Checkup Examinees in a University Hospital
Jo, Mal-Suk ; Suh, Soon-Rim ; Kim, Keon-Yeop ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 147~156
DOI : 10.5762/KAIS.2016.17.6.147
The purpose of this study was to identify the factors associated with the improvement of metabolic syndrome, and provide basic data for the health management of clients. The subjects were 280 adults who were diagnosed with metabolic syndrome in 2013, and who were examined from January 2013 to December 2014. The data were analyzed by descriptive statistics, t-test,
-test, and logistic regression analysis with SPSS WIN 18. The change rate from 3 to 2 risk factors was 60.6% among those clients whose metabolic syndrome improved. The improvement group showed a decrease in their waist circumference, systolic blood pressure, triglycerides and increase in their HDL cholesterol in 2014 compared to 2013, as well as decreased drinking, increased exercise, proper calorie, protein and carbohydrate uptake, and increased consumption of a lipid lowering agent. Exercise, calorie uptake and maintenance of an oral hypoglycemic drug influenced the improvement of the metabolic syndrome. In conclusion, it is necessary to have an intervention program including exercise enhancement and diet modification and to reinforce the health education for continuing health management.
A Study on Modeling and Forecasting of Mobile Phone Sales Trends
Kim, Min-Jeong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 157~165
DOI : 10.5762/KAIS.2016.17.6.157
Among high-tech products, the mobile phone has experienced a rapid rate of innovation and a shortening of its product life cycle. The shortened product life cycle poses major challenges to those involved in the creation of forecasting methods fundamental to strategic management and planning systems. This study examined whether the best model applies to the entire diffusion life span of a mobile phone. Mobile phone sales data from a specific mobile service provider in Korea from March of 2013 to August of 2014 were analyzed to compare the performance of two S-shaped diffusion models and two non-linear regression models, the Gompertz, logistic, Michaelis-Menten, and logarithmic models. The experimental results indicated that the logistic model outperforms the other three models over the fitted region of the diffusion. For forecasting, the logistic model outperformed the Gompertz model for the period prior to diffusion saturation, whereas the Gompertz model was superior after saturation approaches. This analysis may help those estimate the potential mobile phone market size and perform inventory and order management of mobile phones.
Seismic Analysis of the Reflective Metal Insulation for Thermal Shielding of Main Equipments of Nuclear Power Plants
Kim, Seung-Hyeon ; Rhee, Huinam ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 166~172
DOI : 10.5762/KAIS.2016.17.6.166
This paper deals with the seismic qualification of the reflective metal insulation for thermal shielding that is installed on the outer surfaces of the main equipment of the primary coolant system of a nuclear power plant. A small-scale model of the reactor pressure vessel, which has equivalent dynamic characteristics, was designed to be tested in domestic seismic testing facilities in the future. In this study, seismic analysis of the small-scale model installed with metal insulation was performed using equivalent static analysis and response spectrum analysis. The required Response Spectrum for main equipment of the primary coolant system of APR-1400 plant were considered to establish the enveloping response spectrum, which was applied to the seismic analysis model. The results from two seismic analysis methods were compared to show the structural adequacy of the metal insulator design against a safe shutdown earthquake. This study will form the basis for the seismic testing to support the seismic qualification of the reflective metal insulator.
The Effect of Working Capital Management on Corporate Performance
Kam, Hyung Kyu ; Shin, Yong Jae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 173~180
DOI : 10.5762/KAIS.2016.17.6.173
This study examines the effect of firms' working capital management on their performance for a sample of non-financial companies listed on the Korea Exchange (KRX). The working capital and corporate performance are measured as the ratio of the net working capital to sales and return on assets, respectively. The results are as follows. First, there is no significant relationship between the working capital and corporate performance in the total sample. Second, the working capital is positively related to the firms' performance in the negative working capital group while the working capital is negatively related to the corporate performance in the positive working capital group. These findings indicate the existence of an optimal working capital level for firms. Third, the firms' financial constraints have no effects on the relationship between the working capital and corporate performance. This suggests that there are no interactive effects among the working capital, financial constraints, and profitability of the firms. This study implicates that managers should consider the different roles and impacts when developing an efficient working capital management strategy.
Effect of Exercise Type and Intensity on Insulin Resistance and Cardiovascular Disease Risk Factors in Obese Middle Aged Women
Lee, Dae-Hee ; Oh, Du-Hwan ; Zhang, Seok-Am ; Lee, Jang-Kyu ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 181~191
DOI : 10.5762/KAIS.2016.17.6.181
This study examined the effects of exercise intensity and type on insulin resistance, cardiovascular disease risk factors, and exercise time. Obese thirty-two subjects (>body fat 30%) were randomly assigned one of four experimental groups: VO2 max 50% aerobic exercise group (MAE, n=8), VO2 max 80% aerobic exercise group (VAE, n=8), VO2 max 50% + resistance exercise group (MARE, n=8), and VO2 max 80% + resistance exercise group (VARE, n=8). Body fat significantly decreased in all groups and insulin resistance decreased significantly in MARE and VARE (p<.05 & p<.01) after exercise. CRP and IL-6 were slightly reduced after exercise, although these did not reach statistical significance, whereas the IL-6 level of the VAE group decreased significantly (p<.05). TNF-
significantly decreased in the MAE group (p<.05) but significantly increased in the VARE group after exercise (p<.05). For exercise time, higher intensity exercise groups were significantly less than the lower intensity exercise groups (p<.001). These results suggest that body fat is affected by all kinds of exercise intensity and type while CRP is not. Insulin resistance and TNF-
were affected by exercise type, whereas IL-6, TNF-
, and exercise time were affected by exercise intensity.
The study on the effect of Brand image, Brand recognize, Relationship Quality in Food-Service on Industry
Seo, Gyeong-Do ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 192~198
DOI : 10.5762/KAIS.2016.17.6.192
The purpose of this study was to determine the relationship between the brand and awareness of the brand image relationship in a catering company in Gwangju quality(trust, satisfaction). Twenty adults aged 20 years or older residing in Gwangju were surveyed after setting a hypothesis as a convenience sampling method in order to achieve the research objectives via extraction of the sample survey and empirical analysis. Customers using the brand image of catering companies in a relationship significantly affected the quality of the relationship (trust) forming symbolic images, but the images that were empirically related significantly to the trust did not form a significant relationship for trust. Brand image quality significantly impacted the relationship(satisfaction) that is the symbolic image of relations forms a significant relationship between satisfaction. Empirically, however, the image did not form a significant relationship for satisfaction. Brand recognition is significant in relationship quality(trust) and a significant relationship brand recognition, as it has formed a significant relationship on trust. Brand recognition is the quality of the catering companies using the customer significant effect on the relationship (satisfaction) relationship of brand recognition was formed a significant relationship satisfaction. As a result, the catering company's brand image, brand perception and empirical validation suggested a relationship between the quality of the relationship that provided very significant implications in this regard. In the future, overcoming the limitations of this study will necessitate conducting a more in-depth and detailed study.
Design of a shoe rack for effective sterilization and deodorization of the shoes contaminated by various bacteria
Lee, Sam-Cheol ; Jang, Yong-Seok ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 199~206
DOI : 10.5762/KAIS.2016.17.6.199
The aim of this study was to establish the optimal conditions to design a shoe rack that could effectively sterilize and deodorize shoes contaminated by various bacteria. The manufacture and evaluation of a shoe rock was conducted for one year from October 2014 to September 2015. The antibacterial efficacies were evaluated using Escherichia coli and Staphylococcus aureus by JIS Z 2801:2010. The deodorization efficiency was identified by the standard method for deodorization efficiency evaluation of an indoor air cleaner established by Korea Air Cleaning Association, SPS-KACA002-132:2006. The results showed that antibacterial evaluation showed more than 99.9% of the sterilization effects on Escherichia coli and Staphylococcus aureus after exposure to ultraviolet (UV) light for 30 seconds. The average deodorization efficiency for the test gases was 42.5%. The temperature in the shoes and in the shoe rack was lower than
, respectively, when the UV lamp was turned on for 5 minutes and off for 25 minutes repeatedly. This was controlled by turning the UV lamp on and off to maintain the appropriate temperature in the shoes. In conclusion, the real deodorization efficiency is expected to be higher than the measured value because the internal volume of the shoe rack was smaller than the test chamber used to measure the deodorization efficiency. The deodorization effect could be increased further by the sterilization of bacteria causing bad odors in shoes. Further studies will be needed to determine the temperature deviations within the shoe rack to provide constant conditions.
Effects of Lespedeza Caneata ethanol extract on the Liver, Kidneys of Lead administered Mice
Chung, Kyoung-A ; Cheong, Min-Ju ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 207~214
DOI : 10.5762/KAIS.2016.17.6.207
This study determined the effect of Lespedeza Caneata extract on the livers and kidneys of lead-administered mice. The experimental groups were divided into a normal group, Pb 4W group, Pb-LC 4W group, Pb 8W group, and Pb-LC 8W group. The normal group was supplied single distilled water, and the pb group was provided distilled water in which lead acetate was dissolved at 1,000 ppm. The Pb-LC group was provided with lead as drinking water, and the Lespedeza Caneata was orally medicated at a concentration of 500 mg/kg daily. AST, ALT, and BUN enzyme activities and histological experiments on the livers and kidneys resulted in the following conclusions. AST, ALT, and BUN activities increased in the experimental group compared to the normal group and decreased more in the Pb-LC group than the pb group during the same period. The histological results reveal that portions of the livers and kidneys were deformed in the Pb 4W group, and most of the Pb 8W group experienced necrosis and deformation. pb-LC4W and Pb-LC 8W groups experienced less deformation than the Pb 4W and Pb 8W groups. During the same period, the Pb-LC group experienced less histological changes than the Pb group. These results suggest that Lespedeza Caneata extract may have some protective effect on hepatic tissue and renal tissue damage with lead-administered in mice.
Return-to-Work Experiences among Nurses after Receiving Cancer Treatment
Kim, Mi-Hye ; Kim, Jeong-Seon ; Kim, Han-Na ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 215~225
DOI : 10.5762/KAIS.2016.17.6.215
The purpose this study was to explore the return-to-work experience of nurses after receiving cancer treatment. The participants of this research were 6 registered nurses who were working when they were diagnosed with cancer. Data were collected by individual in-depth interviews from January 5 to January 29, 2016 and analyzed using phenomenological methodology by Colaizzi(1978). The study results revealed that the return-to-work experiences of nurses after receiving cancer treatment may be categorized as 'Enduring hardly', 'Living a balance in my turning point', 'Reborn' and may be identified with 9 theme clusters and 27 themes. Their experience of returning to work as a nurse after cancer treatment consisted of expressing difficulty in handling both work and treatment. Despite that, they came to live a more mature life after their disease and came to affirm their existence through their work. Thus, an improved working environment to manage both work and treatment and continual support and assistance from society is deemed necessary.
The Effects of Aquarobic Exercise Program on Body Composition and Blood Lipid Concentrations in Obese Elderly Females
Hwang, Yeon-Hee ; Kim, Dong-Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 226~232
DOI : 10.5762/KAIS.2016.17.6.226
In the elderly, a lower muscle mass and higher body fat mass are induced by a lower level of physical activity. A negatively changed body composition with an advanced age can lead to a higher falling risk and rate of diseases. On the other hand, aerobic-type exercise positively influences the body composition and hyperlipidemia in the elderly. Therefore, this study examined the effects of aquarobic training for 12 weeks on the body composition and blood lipid levels in obese old women. The subjects (n = 31, body fat: 33.42%) completed a 12 week water based aerobic training at 12 - 13 of Borg Scale of intensity (three times per week, each session: an hour). The body composition was measured by bioelectrical impedance analysis (Inbody 770-Biospace, Seoul, Korea) and the concentrations of blood lipids (high-density lipids cholesterol (HDL), low-density lipids cholesterol (LDL), triglyceride (TG) total cholesterol (TC)) were determined at pre and post training. A paired t-test was used for data analysis with
. In the results, the body composition (% body fat (p < 0.05) and waist circumference (p < 0.05)) were reduced significantly. The LDL (p < 0.05), TG (p < 0.001) and TC (p < 0.05) were reduced significantly. In conclusion, a 12 week aquarobic exercise program helps improve the body composition and concentrations of serum lipids. Therefore, aquarobic exercise can enhance lipolysis using fat as energy to induce an improvement of the body composition and induce hyperlipidemia.
Reliability of static balance abilities measure using a smartphone's acceleration sensor
Han, Seul-Ki ; Lee, In-Hak ; Park, Nu-Ri ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 233~238
DOI : 10.5762/KAIS.2016.17.6.233
The purpose of this study is to investigate the reliability of static balance measurements using a smartphone. Thirty subjects were selected among university students who had no fractures, history of operation, or inflammatory arthritis, and they had not started regular exercise during the past three months. The smartphone used in this study was a Galaxy S5LTE (SM-G900F, Samsung, Korea, 2014), and the application was a Sensor Kinetics Pro (Ver. 2.1.2, INNOVENTIONS Inc., US, 2015). Static balance ability was measured three times at one-day intervals between tests and retests. The first and second measurements used the same process. Analysis was done using the Wilcoxon signed rank test and intraclass correlation coefficient (ICC (2,1)). The results were as follows. With eyes opened, there was no significant difference (p>0.05), a high volume of correlation (r>0.75, p<0.05), and very high reliability (ICC>0.80) between the first measurement and second measurement. With eyes closed, there was also no significant difference (p>0.05), a high volume of correlation (r>0.75, p<0.05), and very high reliability (ICC>0.80) between the measurements. The results show that the smartphone is likely accurate for measuring static balance. This study will look forward to being the only basis for measuring future application development and the ability to balance.
Design and Analysis of a 12 V PWM Boost DC-DC Converter for Smart Device Applications
Na, Jae-Hun ; Song, Han-Jung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 239~245
DOI : 10.5762/KAIS.2016.17.6.239
In this study, a 12 V PWM boost converter was designed with the optimal values of the external components of the power stage was well as the compensation stage for smart electronic applications powered by a battery device. The 12 V boost PWM converter consisted of several passive elements, such as a resistor, inductor and capacitor with a diode, power MOS switch and control IC chip for the control PWM signal. The devices of the power stage and compensation stage were designed to maintain stable operation under a range of load conditions as well as achieving the highest power efficiency. The results of this study were first verified by a simulation in SPICE from calculations of the values of major external elements comprising the converter. The design was also implemented on the prototype PCBboard using commercial IC LM3481 from Texas Instruments, which has a nominal output voltage of 12 V. The output voltage, ripple voltage, and load regulation with the line regulation were measured using a digital oscilloscope, DMM tester, and DC power supply. By configuring the converter under the same conditions as in the circuit simulation, the experimental results matched the simulation results.
A Study on the Development of a Welding Carriage System for Vertical Weld
Byun, Hong-Seok ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 246~254
DOI : 10.5762/KAIS.2016.17.6.246
Thick-shell welding for super-sized oil storage tanks is currently done manually, which causes deterioration in quality and a lack of uniformity due to frequent rewelding. The limitations of the external environment must also be considered for manual welding. This paper describes the development of a carriage system for automatic vertical welding to increase reliability, reduce cost, and enhance productivity. The system consists of a welding platform, carriage device, and control unit, which were conceptually designed according to design specifications and manufactured with modular parts. In addition, the structure was analyzed for safety and to predict design problems in advance, and the results are reflected in reviewing the design. To evaluate the performance of the system, a tensile test, bending test, and weld time test were carried out, and the results were satisfactory. The time required for automatic weld was greatly improved by more than 87%, compared to the manual welding time.
Synthesis of Cubic and Rod Shapes CaCO3 by Hydrothermal Method
Kang, Kuk-Hyoun ; Jeon, Sang-Chul ; Hyun, Mi-Ho ; Lee, Dong-Kyu ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 255~261
DOI : 10.5762/KAIS.2016.17.6.255
was applied in various industries including rubber, plastics, paint, paper, food additives, and acid neutralizer, etc., owing to its excellent physical and chemical characteristics as well as various appearances of crystals and many reserves. In particular, research on controlling the structure and shape of
has attracted considerable attention recently, because the whiteness and physical characteristics of
depend on the size and shapes of the particles. In this study,
was synthesized using
, which has multi-shapes and structures, using a self-assembly method with a hydrothermal method. The structure and morphology of the
could be controlled by adjusting the pH and precursor concentration. In particular, the pH adjustment appeared to be a critical factor for the morphology and crystal form. In addition, the calcite and cubic shape were obtained at pH 7, while the mixed calcite, aragonite structure, and rod shapes appeared at pH 7 and over. Through an analysis of the particle formation process, the formation of the calcium carbonate particles was confirmed. The physicochemical properties of the synthesized
were analyzed by SEM, XRD, EDS, FTIR, and TG/DTA.
A Comparing and Analysis of Bel canto and Seth Riggs vocalization methods
Seo, Jeong Hwan ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 262~268
DOI : 10.5762/KAIS.2016.17.6.262
The in-country interest in vocalists is worthy of notice. However, the public, including experts, don't have sufficient information for their interest. In this situation, the popularity of Seth Riggs' books is surprising, because his major is vocal music, not popular music, although he is known as 'a great vocal trainer'. Therefore, we should analyze his vocalization methods and compare them with Bel Canto. His skills are (focused on) SLS (Speech-level singing). The unique styles he used are related to Bel Canto in vocal music, but with some differences. Nevertheless, both styles have something in common. For example, they are similar in that they continue to keep up with the times, so as to improve and evolve. Therefore, it is important for the selected passages to be investigated and presented, based on the individual body conditions and properties. Seth Riggs' vocalization method should be systematically examined too. This is because it has great influence on the public.
Effects of Academic Emotions and Interpersonal Relations on SNS Addiction Tendency by Gender Differences in College Students
Jeon, Hae Ok ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 269~277
DOI : 10.5762/KAIS.2016.17.6.269
This study aims to grasp the influence of a college student's academic emotions and the ability of interpersonal relations according to gender on the SNS addiction tendency. Data were collected through a self-reported structured questionnaire from 130 college students using convenient sampling methods from September 1 to October 31, 2015. The research result showed that in the case of male college students, only the ability of interpersonal relations (
, p=.009) was understood as a variable with an influence on the SNS addiction tendency, having approximately 16% power of explanation (F=2.26, p=.049) after controlling for age, daily average duration of using SNS, subjectively-perceived level of dependence on SNS, and one's own level of using SNS. In the case of female college students, it was understood that the daily average duration of using SNS (
, p<.001) and positive academic emotions(
, p=.010) were variables having an influence on the SNS addiction tendency, having approximately 28% power of explanation (F=5.19, p<.001). Accordingly, to solve the psycho-social health problems related to male and female students' SNS addiction based on this research, it might be helpful for planning a program by taking into account the differences between the related variables according to gender.
Effects of Change in Body Mass Index on Change in Serum Total Cholesterol Levels among Industrial Workers
Yoon, Seok-Han ; Lee, Myung-Jun ; Cho, Young-Chae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 278~290
DOI : 10.5762/KAIS.2016.17.6.278
The purpose of this study is to investigate the association of total cholesterol levels (TC) and the incidence of hypercholesterolemia in response to changes in BMI. The subjects included a total of 28,249 industrial workers (25,548 male and 2,701 female) aged 30-69 years old who had received regular medical check-ups at least once per year from 2002 to 2012 (over 11 years). Data from this period were categorized into a first term (2002-2005), middle term (2006-2009), and last term (2010-2012). Then, the average TC was stratified by BMI, which was obtained from the initial examination results of each individual. In addition, average changes in TC were analyzed by stratifying with changes in BMI over 10 years (starting in 2002). The annual occurrence rates of hypercholesterolemia stratified by BMI were further assessed in patients with normal ranges of TC. In all three terms, the average TC was significantly elevated in the obese group (
) compared to the low weight group (
) and the normal weight group (
). Similarly, the group with higher BMI presented elevated rates of hypercholesterolemia compared to the groups with low BMI. In addition, increased BMI over the 10 year period significantly influenced TC. Consequently, it is suggested that evaluation and intervention for obesity control may be needed in order to manage the risk of high serum lipid levels.
An Analysis on Support Facilities Which Consider User's Characteristics in High-tech Industrial Estate in Urban Area
Choi, Hyung-Ku ; Kim, Won-Pil ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 291~299
DOI : 10.5762/KAIS.2016.17.6.291
Recently, the knowledge industry center has played a role as a facility that creates economic added value because of the high-tech companies related to the knowledge industry, information, and communication. On the other hand, support facilities that are provided in the knowledge industry center are meant to support the company in the center and improve the working conditions of laborers. On the other hand, the support policy established by the government applies to some companies, and none of the support policy is carried out in supporting facilities in the knowledge industry center. In this study, multiple analysis was performed, focusing on the support facilities in the knowledge industry center that aims to improve the working environment of laborers. This study suggests the introduction of guidelines to secure adequate area, depending on the type of supporting facilities in the Knowledge Industrial Center. The sharing of facilities, such as cultural and commercial use for Knowledge Industrial Center, corresponding to poor provision, is recommended. Because the analysis of IPA indicates that the area of commercial support facilities are higher than others and cultural facilities are more important and preferred, it is necessary to compose support facilities that consider the user's individual characteristics. Facilities impacting the working environment need to be planned carefully through a district unit plan at the initial stages of development, thus assisting the production activity of workers.
The Effect of Motivation on Cyber Plagiarism in Using Social Media: The Focus of Subjective Norm's moderating Effect
Kang, Sora ; Han, Su Jin ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 300~307
DOI : 10.5762/KAIS.2016.17.6.300
The development of computer-based information technology has led to the quantitative and qualitative growth of social media which have two sides; a positive one such as the generation and sharing of information and a negative one which includes cyber plagiarism and cyber bullying. This study seeks to understand which factors can lead to cyber plagiarism, which is the most prevalent form of unethical cyber behavior. We expected that the intrinsic and extrinsic motivations for using social media would have different effects on unethical cyber intention and that this relation between motivation and cyber unethical behavior would be moderated by the subjective norm. In order to obtain a better understanding of the relationships among the individual motivation, unethical cyber intention, and cyber plagiarism, information was obtained from 564 social media users. The respondents provided details of their experiences and attitudes regarding social media usage behavior and unethical cyber behavior. The results confirmed that extrinsic motivation significantly increases unethical intention and further leads to high levels of cyber plagiarism. The subjective norm plays a moderating role in the relationships between extrinsic motivation and unethical cyber intention. Based on the results, the theoretical and practical implications of the research findings are discussed, and recommendations for future research are provided.
Majoring in social work Majors satisfaction, Career adaptability, Career identity, Employability, Ego-resilience research on the effect of Careers Stress : Focusing on the latent mean analysis by Gender
Yun, Il-Hyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 308~314
DOI : 10.5762/KAIS.2016.17.6.308
The aim of this study was to identify the factors affecting the social welfare of students and the Career Stress. This study verified the complete model equation through the structure. The differences between the groups according to gender were significant. Majors Satisfaction, Career adaptability, Career Identity, Employability, ego-resilience, and Career Stress were used as variables. From the Gwangju Regional Social Welfare, 246 people were college students. The analysis was performed using Structural Equation Modeling with Latent mean analysis. The Male and Female's Majors Satisfaction, Career adaptability, Career Identity, Employability, ego-resilience, and Career Stress were similar. The impact on the path of ego-resilience and Career Stress was also similar. The Female group had a stronger impact than the ego-resilience and Career Stress Male. The Social Welfare of Students Majors Satisfaction, Career adaptability, Career Identity, Employability, ego-resilience Career Stress were different in the male and female groups.
A Study on the Application Method of Munition's Quality Information based on Big Data
Jeon, Sooyune ; Lee, Donghun ; Bae, Manjae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 315~325
DOI : 10.5762/KAIS.2016.17.6.315
Due to the expansion of data and technical progress in the military industry, it is important to extract meaningful information for assuring quality and making policies. The analysis of trends and decision making based on big data is helpful for increasing productivity in business and finding new business opportunities. We propose an application to collect reliable quality information for munitions and build a big data platform for using the accumulated information and numerical data. We verified the proposed platform using the Test Report Information Service (TRIS) system and suggest a method that utilizes unstructured and semi-structured data accumulated by TRIS. Thus, we expect that the proposed platform will help in building infrastructure for military data, making efficient strategies, and analyzing trends for assuring munitions quality.
The Relationships in Emotional Intelligence, Job Satisfaction, and Quality of Nursing Service in Hospital Nurses
Jang, Ra-jin ; Kang, Young-Sil ; Kim, Yu-mi ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 326~337
DOI : 10.5762/KAIS.2016.17.6.326
This study was conducted to identify the relationships between emotional intelligence, job satisfaction, and quality of nursing service for hospital nurses, and to serve as a basis for improvement of nursing service and nursing resources management. All data were collected and conducted with the cooperation of the nursing service department in a tertiary general hospital and two general hospitals located in G province. Questionnaires were completed by 195 nurses who consented to participation in the study from 7 to 28 April 2014. Data were analyzed using SPSS 18.0. A highly positive relationship (r=0.624, p<0.001, r=0.612, p<0.001) was observed between emotional intelligence and quality of nursing service in the superior general hospitals and the general hospitals. Based on this study, quality of nursing service could be improved by a positive relationship between emotional intelligence and job satisfaction in the superior general hospitals and general hospitals (r=0.430, p<0.001). Therefore, it is important to provide a good occupational environment and develop educational programs to enhance the emotional intelligence of nurses, and a positive measure focused on less experienced and young nurses to improve emotional intelligence.
The Effect of the Health Education Program for Mothers with Developmental Disabled Children on Health Care Behavior and Parenting Stress
Kim, Hye-Young ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 338~346
DOI : 10.5762/KAIS.2016.17.6.338
This study was conducted to develop a health education program to help mother's cope with developmentally disabled children's health, and to test the effects of the program. The contents of the health education program were based on the results of a discussion with experts and previous studies. The program consisted of two parts, physical health and psychosocial health, which were measured over 4 weeks. The results of the study showed that the program helped mothers improve the level of health care and reduce parenting stress level. These findings suggest that studies for handicapped children's health should be conducted in the future using an interdisciplinary approach.
Study on Folklore Consciousness of Twelve Chinese Zodiac Animals Shown in Folk Painting
Lee, Jong kawn ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 347~359
DOI : 10.5762/KAIS.2016.17.6.347
People are destined to live according to the time and fate after they are born. Man is connected with the idea that is called the Chinese zodiac sign related to one out of 12 animals, regardless of one's thought. This paper was written with the expectation that it will be a new turning point understanding the mutual influence and its changing process by catching the ethnic belief and emotion as well as its cultural background in the Asian Zone by investigating the meaning of the 12 Chinese zodiac shown in the folk painting from the viewpoint of folk lore including "Chinese zodiac sign" culture rooted in our daily lives. The animal 'Rat' has been lived well human beings accompanied by the fable or the nature, while the animal 'Ox' has been living together with human history. The 'Tiger' has been considered the 'Power retreating disease or a devil' to humans, which is the most frightening but near at hand. The 'Rabbit' in the fable is inculcating hope and ideals to humans. The imaginary 'Dragon' is rooted in the deep national belief, which is seated as 'Guardian god' of farming culture and mankind, while the 'Snake' is playing a role in protecting humans as the 'Sea God' in Tsushima and Jeju Island, and has been believed and followed in the deep mind of humans. The 'Horse' in the nomad culture has been adorned as the basic creature of nomadic society in the character of a psychic medium between the human and god or their 'Guardian god'. The ancient Japanese regarded 'Monkey' as holy, being connected with treasure. It infers a human's desire to borrow wisdom from 'Monkey'. 'Chicken' includes the meaning of a lucky sign connecting the sky and the human world by arranging together with humans. The 'Dog' is believed and followed as performing the function of a messenger connecting this world with the afterlife in the next world tale of shamanism. The 'Pig' also lives well with humans, being interpreted as fecundity. Although the meaning of the 12 Chinese Zodiac animals has ethnic differences, all of them have been shared with humans, rooted in the human mind, being believed, and followed in human lives.
A Study on the Characteristics of Paul Rudolph's Florida house
Choi, Sung-woo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 360~371
DOI : 10.5762/KAIS.2016.17.6.360
Paul Rudolph's early work in Florida after World War II is a significant example of the regional transformation of typical Modern Architecture through the spatial composition based on the diversity and use of local material and construction methods. Paul Rudolph's concept of a Florida House design is the expression of regional material, construction, and structural system through the spatial extension & connection based on periodical, regional characteristics. The characteristics of the Florida works is the spatial extension & connection design based on the wood structural framework through the various design factors, such as a screen roof, open roof, and internal patio as the spatial extension and link method. Paul Rudolf designed the house using local materials, such as cypress wood and lime block produced near the Florida Area and provided details & technology considering the Florida climate and construction environment. Through studies of Paul Rudolph's Florida works, the Florida Houses can be a prototype of localization, and can be presented as the spatial & technical transformation of design by the historical, cultural, regional background.
System of Agricultural Land Monitoring Using UAV
Kang, Byung-Jun ; Cho, Hyun-Chan ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 372~378
DOI : 10.5762/KAIS.2016.17.6.372
The purpose of this study is to develop a system configuration for gathering data and building a database for agriculture. Some foreign agriculture-related companies have already constructed such a database for scientific agriculture. The hardware of this system is composed of automatic capturing equipment based on aerial photography using a UAV. The software is composed of parts for stitching images, matching GPS data with captured images, and building a database of collected weather information, farm operation data, and aerial images. We suggest a method for building the database, which can include information about the amount of agricultural products, weather, farm operation, and agricultural land images. The images of this system are about 5 times better than satellite images. Factors such as farm working and environmental factors can be basic data for analyzing the full impact of agriculture land. This system is expected to contribute to the scientific analysis of Korea's agriculture.
Relations between Multidimensional Perfectionism and Eating Disorder in High School and College Students Majoring in Dance
Hong, Go-Eun ; Kim, Dong-Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 379~388
DOI : 10.5762/KAIS.2016.17.6.379
High school and college students majoring in dance have different types of stress because of their different circumstances and goals. The purpose of this study was to investigate the relation between multidimensional perfectionism and eating disorder in high school and college students who are majoring in dance. Questionnaires for eating disorder (Eating Disorder Inventory-2(EDI-2) made by Garner (1990) and adapted by Lee (1998)) and multidimensional perfectionism (Multidimensional Perfectionism Scale(F-MPS) made by Frost (1990) and translated by Hyun (1992) were utilized after the sentences in the questionnaires were partially revised and (rendered more appropriate for?) the purpose of this study. The questionnaires were completed by all of the subjects (n=250), but 32 of them were excluded due to insincere answers. Thus, a total of 218 questionnaires were analyzed using SPSS version 21.0. The results showed that the students with a higher education level and who were more career oriented were more likely to suffer from multidimensional perfectionism and eating disorder. In addition, multidimensional perfectionism (concern about mistakes, constant personal and parental expectation) resulted in the development and maintenance of eating disorder for the students majoring in dance. In conclusion, higher education level and greater career orientation induce greater stress in dance major students and cause them to have an incorrect physical image. Thus, these factors may cause higher psychological pressure leading to multidimensional perfectionism and eating disorder. Therefore, these students need to know how to correctly manage their body weight and how to prevent eating disorder.
Analyses of Studies on Exercise Therapy for Middle-Age Women with Chronic Low Back Pain in Korea
Kwak, Hyeweon ; Kim, Nahyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 389~399
DOI : 10.5762/KAIS.2016.17.6.389
This study examined the status of studies on exercise interventions for middle-aged women with chronic low back pain that had been conducted over the past 10 years (2005-2014) in Korea. The existing reports were searched electronically using the database of RISS, National Assembly Library, KISS, and DBpia with the key words of middle-aged women, chronic low back pain, exercise, and exercise program. Finally, 12 articles were included in the review. One article was from nursing science, and 11 were from other disciplines. In a qualitative evaluation on the papers, 1 study scored 8 out of 10 points, 8 studies scored between 5-6 points, and 3 studies scored 3-4 points. Intervention sessions were conducted for 55 minutes, on average, each at a frequency of 3.1 sessions per week, for a total of 29.7 sessions. This study found that lumbar neuromuscular exercise, yoga exercise, and aquatic exercise were effective in rehabilitation in middle-aged women with chronic low back pain. In the future, these findings are expected to be used in nursing intervention for the establishment of the basis for evidence-based nursing practice.
A Study on the Function Improvement of the Serge Protection Device for Radar Control Unit
Jo, Hee-Jin ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 400~407
DOI : 10.5762/KAIS.2016.17.6.400
The purpose of this study is to propose a useful method of solving the problem of thermal stability in surge protection devices (SPDs). First of all, the existence of the problem in the developed SPDs was confirmed by experiment. After analyzing the problem, a useful method of solving it is proposed and implemented. An experiment is performed to verify the performance of the implemented device. The results of this study are as follows; it is revealed that the problem of the thermal stability results from the varistor, one of the components in the SPD. A varistor with a built-in thermal fuse is applied to the SPD for the purpose of solving the problem. The experimental results confirmed that the thermal stability was improved by replacing the varistor. As a result of this study, the reliability of radar control units is enhanced and the probability of malfunction is reduced.
Development of the 3D simulation for disaster prevention in the downtown soil erosion (I)
Shin, Bong Jin ; Youn, Sang Ho ; Lee, Gi Dong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 408~417
DOI : 10.5762/KAIS.2016.17.6.408
The frequent regional torrential or heavy rain and typhoon mostly caused by climate change has resulted in sediment disasters particularly in mountainous or hilly areas. More than 65% of South Korea is mountainous and development and rapid urbanization has brought lots of steep sloping industrial complexes, which are adjacent to cities. Such continuous urbanization and industrialization can result in an increase in serious damage to those places. Korea has very high population density so sediment disaster could result in a tremendous loss of property and life. A recent 10-year (2001~2010) study of the average annual loss shows 68 casualties and property loss of 1.7044 trillion Won(?), which indicates a 20% and 25% decrease for both life and property, respectively, but urban areas are experiencing increasing damage. In this paper, a comprehensive simulator composed by references, analyses, and the recent technologies was applied to visualize the scale of the damaged Woomyeon-san (Mt.) and verify the performance of the simulator.
Analyzing of Project Satisfaction and Intention of Participants about Public Management System Evaluation Indicators of Urban Redevelopment Projects
Lee, Jeong-Jae ; Kim, Gu-Hoi ; Lee, Joo-Hyung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 418~428
DOI : 10.5762/KAIS.2016.17.6.418
The participants in an urban and housing redevelopment project were categorized as construction companies, government employees, and housing cooperatives. This study analyzed how a public management system affects the continuous participation intention using comprehensive project satisfaction. The specific factors for the evaluation items of a public management system were composed using advanced research. A hypothesis and research model was set up and verified using the PLS-SEM model to analyse how the continuous participation intention is affected by the public management system via comprehensive projects satisfaction. Setting the project plan and selecting the project tool, as well as post management and sustainability affect the comprehensive projects satisfaction meaningfully in the case of construction companies. The participation of the user, and post management and sustainability affect the comprehensive project satisfaction meaningfully in the case of government employees. The operating organization and using and participation of the user affect the comprehensive project satisfaction meaningfully in the case of a housing cooperative. The comprehensive project satisfaction affects the continuity of the participation meaningfully in the case of all of project participants.
Factors Affecting the Drinking of Middle School Students from an Urban Area Populated with Low-Income Families
Do, Eun-Young ; Hong, Yeon-Ran ; Park, Hae-Ryoung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 429~437
DOI : 10.5762/KAIS.2016.17.6.429
This study investigated factors affecting drinking in middle school students from an urban area populated with low-income families to provide data necessary for drinking prevention. The subjects consisted of 1,192 middle school students. Analysis of collected data was carried out by descriptive statistics and stepwise multiple regression using SPSS 19.0 software. The proportion of students who had drinking experience was 44.1%, among which 57.2% first experienced drinking during elementary school or earlier. The highest motivation for student's drinking was encouragement by parents at 48.9% while 12.0% of parents were indifferent to drinking by their children and 21.5% permitted drinking. Scores for subjects' loneliness, father's parenting, and mother's parenting were 36.71, 40.07, and 50.87, respectively. Factors affecting drinking were identified as school life, parent's attitude to children's drinking, and father's parenting. These results suggest that it is necessary to develop drinking prevention programs for middle school students in urban areas with high populations of low-income families as well as follow-up studies over wider urban areas of low-income population.
Predictors of Weight Control Behavior According to College Students' BMI, Perception of Body Shape, Obesity Stress, and Self-Esteem
Kim, Jong-Im ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 438~448
DOI : 10.5762/KAIS.2016.17.6.438
This study was conducted to identify factors influencing the weight control behavior of college students. The subjects included college students in the C area, and data were collected through a self reported structured questionnaire from Dec 01 to 20 of 2015. Overall, 289 subjects were analyzed. Analyses consisted of descriptive statistics, t-tests, ANOVA, Pearson's correlation analysis, and stepwise multiple regression analysis. The findings showed a prominent distortion of college students' perceptions of their bodies based on evaluation by others and obesity stress, which had special impacts on their weight control behavior. Weight control behavior, body self-awareness (r=.31, p<0.001), assessment of body by others (r=.30, p<0.001), and obesity stress (r=.43, p<0.001) were closely related to their weight control behavior. Stepwise multiple regression revealed that their weight control behavior was closely influenced by obesity stress (
, p<0.001) and assessment of body by others (
, p=0.009). These variables accounted for 20% of the weight control behavior (F=37.30, p<0.001). Overall, assessment of body by others and obesity stress were found to be predictors of their weight control behavior. These findings indicate that it is necessary to develop and implement information programs and design appropriate prevention programs that can induce healthy weight control behaviors. Such programs should include health education, as well as intervention programs to identify such predictors and help college students judge and perceive their body shapes objectively so that they control their weight in a proper manner.
The Competence and Satisfaction on Inventory Management of the Operating Room Nurses
Son, Jeong-Sook ; Choi, kyung-Sook ; Kim, Hyun-Joo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 449~458
DOI : 10.5762/KAIS.2016.17.6.449
The study verified the work capacity (job performance, perception, knowledge) and satisfaction on managing the inventory of operating room nurses working in a more than 700-bed hospital. The purpose of this study was to provide basic data of education for work capacity and satisfaction and quality insurance by analyzing the scores between the three different operating rooms and the correlation between the work capacity and satisfaction by investigating the related factors. This study presented a structured and self-administered questionnaire to 181 nurses who had been working in the operating room more than six months. The mean and standard deviation of the job performance, perception, knowledge, and satisfaction were 4.2(
), and 3.4(
), respectively. The work capacity and satisfaction of each group did not show a statistically significant difference. The correlations between the job performance and knowledge, knowledge and perception, perception and satisfaction were positive (r=.627, p<0.01), (r=.663, p<0.01) and (r=.485, p<0.01), respectively. Among the factors related to the general characteristics of operating room nurses, only age significantly affected their job performance. This study provides basic data on the maintenance and improvement of their competence and satisfaction by being served as a resource for sustainable human resources management and training, and efficient management of the communication channel between hospitals.
The Relationship among Flow, Satisfaction, Service Quality, and Revisit Intention of College Ski Class Participants
Han, Gun-Soo ; Lee, Jung-Heun ; Ko, Wisug ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 459~468
DOI : 10.5762/KAIS.2016.17.6.459
The purpose of this study was to examine the relationship among flow, satisfaction, service quality, and revisiting intention of college ski class participants. By analyzing a total of 106 college students from a university in G city, this study found the following. First, the flow of ski classes had a positive influence on the satisfaction with the ski class. Second, the satisfaction with the ski classes had a positive influence on the service quality of the ski resort. Third, the service quality of the ski resort had a positive influence on the revisit intention. Fourth, the flow of the ski class had a positive influence on the service quality of the ski resort mediated by the satisfaction of the ski class. Fifth, the satisfaction of the ski class had a positive influence on the revisiting intention mediated by the service quality of the ski resort.
Analysis on the Factors Affecting Housing Tenure of Single-Person Households of Young Generation Employing the Multinomial Logit Model
Lee, Mu-Seon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 469~481
DOI : 10.5762/KAIS.2016.17.6.469
The number of single households in Korea has been sharply increasing due to dissolution of the family community and changes in housing culture. Therefore, there is a need to develop a plan for diagnosis of changes in the housing market in response to a rapid increase of single household to suggest a proper direction of housing policy. This study was conducted to clarify the factors influencing housing occupancy type targeting a single adult household. To accomplish this, a cross-sectional analysis was conducted using the multi-nominal logit model and the Korea Welfare Panel's 9th survey materials. Occupants of ingle households in their 20s and 30s were found to be much poorer than those in their 40s, or older. Additionally, single household in their 20s and 30s, the characteristic of a household having an influence on the choice of housing occupancy type showed a result in a different direction even from the same household characteristic of those in their 40s, or older. Finally, the characteristics of occupants of single households in their 20s and 30s showed room for improvement through public support. Overall, the results of this study implied the need to inquire into the government's periodic support in more diverse ways.
Longitudinal Trends(2004-2014) of the Use and Non-use of Information Technology among Older Adults
Kim, Myoung-Yong ; Jun, Hey Jung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 482~494
DOI : 10.5762/KAIS.2016.17.6.482
This study examines the longitudinal trends regarding awareness of informatization, Information Technology (IT) use, and attitudes towards IT among older adults aged 60 or over. Surveys were conducted in 2004 and 2014 at senior welfare centers in Seoul, Korea. The trends between 2004 and 2014 showed that the rate of Internet use increased among older adults who lived alone, were aged 70 or over, had middle education level, had low income, or were unemployed. Older adults had positive attitudes towards IT, and users were more positive than non-users. The levels of IT use were low among users, and their reasons for IT use were for psychological, emotional, and practical purposes. For non-users of IT, their passive tendencies toward IT use and informatization were amplified. As such, the state of IT use and attitudes toward it among older adults in Seoul were longitudinally different, and the differences in awareness and ability between users and non-users tended to increase.
The intervention effects of the Clean Diet program on the health promotion attitudes and the physiological indices of an elderly
Shin, So-Hong ; Kim, Hyun-Sil ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 495~509
DOI : 10.5762/KAIS.2016.17.6.495
In this study, 60 seniors aged at least 65 years who attended C Senior College in Daegu were selected and randomly allocated to test and control groups of 30 subjects each. The Clean Diet Program was only applied to the test group, and the differences in self-efficacy, depression, health behavior, subjective perception of health, wellness, and physiological indices (blood pressure, blood glucose levels, hyperlipidemia, and BMI) between the test and control groups were compared. The results show a significant difference in the test group exhibiting improved or mitigated self-efficacy (t=6.003, p<.001), depression (t=4.038, p<.001), health behavior (t=6.196, p<.001), subjective perception of health (t=6.624, p<.001), and wellness (t=7.069, p<.001). Among the physiological indices, there was a significant decrease in BMI (t=5.974, p<.001). The results demonstrate the mediation effects of the Clean Diet Program. Since the Clean Diet Program can be implemented through walking, simple exercises, and eating habits, it provides great economic efficiency and usefulness and provides a very reasonable intervention program for the elderly. Based on the results, we discuss how to improve the elderly's attitude toward health promotion and their quality of life.
A study of Relationship between Death Perception, Spiritual Well Being and Terminal Care Stress of Geriatric Hospital Nurses
Yang, Jin-Hee ; Shin, Sung-Rae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 510~520
DOI : 10.5762/KAIS.2016.17.6.510
The purpose of this study was to understand death perception, spiritual well-being, and terminal care stress in geriatric hospital nurses and analyze related factors affecting terminal care stress. The participants were 181 nurses working in six geriatric hospitals located in Seoul and Gyonggi Province, Korea. Data were gathered from July 16 to August 1, 2015. The data were analyzed using ANOVA, t-test, Duncan test, and logistic regression. Death perception of geriatric hospital nurses had an average score of 4.30, spiritual well-being 3.40, and terminal care stress 3.84. Terminal care stress in relation to general characteristics showed a meaningful difference in religion and total clinical career. The terminal care stress level was divided into two groups using average score as a standard, and the results revealed that spiritual well-being had a significant impact on terminal care stress of geriatric hospital nurses. These factors need to be considered when developing an educational program to reduce terminal care stress of nurses working in a geriatric hospital.
Research of Colonoscope Robot With Rotary Inertia Type Locomotion Mechanism
Lee, Jaewoo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 521~526
DOI : 10.5762/KAIS.2016.17.6.521
This paper suggests a new design that makes use of rotary inertia that can allow autonomous movement of an autonomous colonoscope robot in the colon of a patient as a locomotive mechanism. As commercial colonoscopy causes a lengthy time of pain and discomfort to the patients when colonoscopy patients are reluctant to receive surgery, there is a tendency to avoid the test in the early diagnosis of colorectal cancer. To solve this problem, research has been conducted on the next generation of robotic colonoscopes that can reduce the discomfort and pain by moving autonomously within the colon of the patients. In the driving mechanism utilizing the rotational inertia, a flywheel is driven by a motor to store energy and produce rotational inertia. By the energy stored and released by the flywheel, the stick phenomenon that occurs when the robot is running in the intestine can be overcome effectively. To do this, a controller that can control the velocity of the flywheel and is robust to high frequency noise was designed and implemented. The driving mechanism using the rotational inertia presented here showed that the structure is also effective and the experiment can be run easily compared to another mechanism.
Importance-Performance Analysis(IPA) of the selection attributes of functional cosmetics
Han, Do-Kyung ; Lee, Hyun-Jun ; Paik, Hyun-Dong ; Shin, Dong-Kyoo ; Park, Dae-Sub ; Hwang, Hye-Sun ; Hong, Wan-Soo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 527~536
DOI : 10.5762/KAIS.2016.17.6.527
This study aims to generate baseline data for vitalizing the sales of functional cosmetics through an Importance-Performance Analysis (IPA) of the selection attributes of functional cosmetics. From the analysis of consumers' selection criteria, the study will assist functional cosmetics companies in reflecting consumer demands and therefore securing competitiveness. For this, general consumers aged over 20 years were surveyed for 5 weeks from Feb 23 through Mar 30, 2015, and 447 empirical data (response rate 88.9%) were processed through SPSS WIN 21.0 program for analysis. To conduct gender difference analysis on the IPA of the selection attributes of functional cosmetics, 17 selection attributes were categorized into 4 factors: functionality, labeling, popularity, and product. Cronbach's alpha for all factors was 0.5, proving the internal consistency and reliability of the survey. The survey results showed that while the entire average came out significantly higher for females (5.89/7points) than for males (5.66/7points) (p<0.001), the selection attributes 'anti-wrinkling', 'whitening function', 'functionality', 'expiration date', 'full ingredient labeling system' and 'various promotional events' showed significant gender differences. IPA results pertaining to gender showed 'price', 'functionality', 'spreadability' and 'full ingredient labeling system' as 2nd quadrant attributes, whereas female consumers selected 'price', 'whitening function', 'anti-wrinkling', 'functionality' and 'full ingredient labeling system' as attributes. Results show that businesses in the field of cosmetics and related areas need to prioritize improving the following factors that received low satisfaction from all consumers: 'price', 'functionality', and 'total labeling.' In particular, the 'price' aspects are considered to require reasonable and affordable pricing.
Risk factors for the development of oral bacteria in workers according to oral environment
Hong, Min-Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 537~545
DOI : 10.5762/KAIS.2016.17.6.537
This research examined the oral environmental factors to identify the risk factors for oral bacteria detection. This study comprised of 60 office workers aged between 20 and 65 years, and was performed from January 15 to February 28, 2015. The study variables measured were the stimulated and unstimulated salivary flow rates, salivary buffering, saliva pH, dry mouth at the dorsum of the tongue and the sublingual region, halitosis, and the degree of tongue-coating as oral environmental factors. To identify the presence of oral bacteria, pathogens were detected by extracting the gDNA of the resting salivary flow rate. The risk of S.mutans detection was 15 times higher with smokers, 1.3~1.6 times higher when the resting or stimulated salivary flow rate was reduced by 1 mm. The risk of P.intermedia detection was 13 times higher in smokers, 4.3 times higher as the severity of oral dryness was lowered, and 4 times higher for adults with a tongue coating than those without. In addition, the risk of detecting TM7 was 5.5 times higher as sublingual dryness was decreased by 1mm. The oral bacterial count will be reduced considerably by smoking cessation education and habits that facilitate a salivary flow rate. Furthermore, adults with good and well-managed dental hygiene are anticipated to have less oral bacteria and fewer dental diseases.
The Influence of Stress Response, Physical Activity, and Sleep Hygiene on Sleep Quality of Shift Work Nurses
Jeong, Ji-Yeong ; Gu, Mee-Ock ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 546~559
DOI : 10.5762/KAIS.2016.17.6.546
This study was conducted to analyze the relationship between sleep quality, stress response, physical activity and sleep hygiene in shift work nurses and identify factors influencing sleep quality. The participants were 168 shift nurses from university hospitals and general hospitals located in C city, Gyeongnam. Data were collected from March 25 to 31, 2016. The study instrument use to the Pittsburgh Sleep Quality Index, Stress Response Inventory, Korean version of the International Physical Activity Questionnaire Short Form and Sleep Hygiene Scale. Date were analyzed by frequency, t-test, ANOVA, Pearson's correlation and hierarchical multiple regression using SPSS/win18.0. The sleep quality index was 7.35 (range 0-21), stress response was 2.20 (range 1-5), physical activity was 3986MET-min/week, and sleep hygiene was 2.73 (range 1-6 points). There were significant differences in sleep quality according to shift work experience, health status and circadian rhythm type. Factors influencing sleep quality included shift work experience, sleep hygiene, stress response and physical activity, which together explained 40% of the total variance of sleep quality. Therefore, it is recommended that sleep hygiene education be implemented as a strategy to reduce stress response, and that shift work nurses engage in a moderate level of physical activity to improve their sleep quality.
Short Selling and Predictability of Negative Sock Returns: Evidence from the Korean Stock Market
Yoo, Shiyong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 560~565
DOI : 10.5762/KAIS.2016.17.6.560
In this study, we empirically scrutinize the relationship between short selling transactions and stock price behaviors using the stock market data in Korea during the period from January 2005 to March 2016. We chose the short selling volume ratio (SVR), stock lending volume ratio (LVR), and stock lending open interest ratio (LIR) as variables of the short selling trading activities. We construct portfolios based on the percentile of the short selling volume ratio during the sample period; upper-10%-SVR portfolio, upper-25%-SVR portfolio, upper-50%-SVR portfolio. We estimate the monthly firm-specific return and monthly skewness of the daily firm-specific returns of each portfolio. The firm-specific return or skewness is specified as a dependent variable and the short selling activities as explanatory variables. The results show that all of the statistically significant estimates of the short selling activities for the firm-specific returns are negative and that all of the statistically significant estimates of the skewness of the short selling activities are positive. These results support the hypothesis that short selling activities cause the stock price to decrease.
Relationships between the Housing Market and Auction Market before and after Macroeconomic Fluctuations
Lee, Young-Hoon ; Kim, Jae-Jun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 566~576
DOI : 10.5762/KAIS.2016.17.6.566
It is known that the Real Estate Sales Market and Auction Market are closely interrelated with each other in a variety of respects and the media often mention the real estate auction market as a leading indicator of the real estate market. The purpose of this paper is to analyze the relationships between the housing market and auction market before and after macroeconomic fluctuations using VECM. The period from January 2002 to December 2008, which was before the financial crisis, was set as Model 1 and the period from January 2009 to November 2015, which was after the financial crisis, was set as Model 2. The results are as follows. First, the housing auction market is less sensitive to changes in the housing market than it is to fluctuations in the auction market. This means that changes in the auction market precede fluctuations in the housing market, which shows that the auction market as a trading market is activated. In this respect, public institutions need to realize the importance of the housing auction market and check trends in the housing contract price in the auction market. Also, investors need to ensure that they have expertise in the auction market.
A Study on the Effect of Transaction Justice on Project Performance with Mediating Effect of Partnership
Sim, Eun Taek ; Lee, Jae Kwang ; Jo, Hyeon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 577~587
DOI : 10.5762/KAIS.2016.17.6.577
The purpose of this study is to test the relationships between transaction justice and partnership, between transaction justice and project performance, and between partnership and project performance in the selection process in which a prime contract company chooses a subcontractor. For the empirical study, we chose a research model based on related studies and surveyed the real contractors in the field of construction. The results of this study are as follows. First, the partnership has a statistically significant positive effect on the interactional justice, procedural justice, and distributed justice. Second, the project performance is affected by the interactional justice and procedural justice. Finally, the transaction justice has a directly positive relation with the project performance and an indirectly positive relation with the project performance through partnership. In this study, we carried out empirical research into the relationship between transaction justice and project performance through partnership.
A Study on Increasing the Efficiency of Biogas Production using Mixed Sludge in an Improved Single-Phase Anaerobic Digestion Process
Jung, Jong-Cheal ; Chung, Jln-Do ; Kim, San ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 588~597
DOI : 10.5762/KAIS.2016.17.6.588
In this study, we attempted to improve the biogas production efficiency by varying the mixing ratio of the mixed sludge of organic wastes in the improved single-phase anaerobic digestion process. The types of organic waste used in this study were raw sewage sludge, food wastewater leachate and livestock excretions. The biomethane potential was determined through the BMP test. The results showed that the biomethane potential of the livestock excretions was the highest at
, and that the highest value of the composite sample, containing primary sludge, food waste leachate and livestock excretions at proportions of 50%, 30% and 20% respectively) was
. On the other hand, the optimal mixture ratio of composite sludge in the demonstration plant was 68.5 (raw sludge) : 18.0 (food waste leachate) : 13.5 (livestock excretions), which was a somewhat different result from that obtained in the BMP test. This difference was attributed to the changes in the composite sludge properties and digester operating conditions, such as the retention time. The amount of biogas produced in the single-phase anaerobic digestion process was
with a methane content of 62.8%. Considering the value of
of biogas produced as its design capacity, it was considered that this process demonstrated the maximum capacity. Also, through this study, it was shown that, in the case of the anaerobic digestion process, the two-phase digestion process is better in terms of its stable tank operation and high efficiency, whereas the existing single-phase digestion process allows for the improvement of the digestion efficiency and performance.
The Survey on the Influence of Clinical Nurse's Critical Thinking Disposition, Problem-solving Skill and Self-efficacy on Patients Safety Competencies
Kim, Hyo-Sun ; Han, Suk-Jung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 598~608
DOI : 10.5762/KAIS.2016.17.6.598
This study examined the relationships among patient safety competence, critical thinking disposition, problem-solving competence, and self-efficacy of clinical nurses to identify the factors influencing the patient safety competence. A convenience sample of 373 nurses working in 4 general hospitals in a Metropolitan area in Korea was selected. After obtaining IRB approval, data collection was done with a structured self-administered questionnaire from October 14th to November 4th, 2014. The data were analyzed using descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient and multiple regression analysis using the SPSS WIN 21.0 program. The participants showed a moderate level of patient safety competence (
), of critical thinking disposition (
), of problem solving competence (
), and of self-efficacy (
). The patient safety competence of the participants showed a significant correlation with the critical thinking disposition (r=.493, p<.001), problem solving competence (r=.616, p<.001), and self-efficacy (r=.475, p<.001). The significant factors influencing the patient safety competence were problem solving competence (
, p<.001), self-efficacy (
, p=.005), critical thinking disposition (
, p=.018), and having the experience of reporting patient safety accidents (
, p=.002). The results suggest that educational programs to enhance the critical thinking disposition, problem-solving competence, and self-efficacy would develop the patient safety competence of clinical nurses. In addition, more effort should be placed into reinforcing the patient safety competence by activating the report of patient safety accidents.
Study on Self-efficacy, Communication competency, Critical thinking disposition and Clinical performance ability of nursing students
Kim, Mi-Ok ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 609~617
DOI : 10.5762/KAIS.2016.17.6.609
This study examined the influence of self-efficacy, communication competency and critical thinking disposition on the clinical performance ability in nursing students. A convenience sample of 274 subjects were recruited from four colleges, and the survey was conducted from September 1st to 20th 2015. The data were collected by questionnaires and analyzed with the SPSS WIN 21 program, using descriptive statistics, Pearson's correlation coefficient and multiple regression. Significant positive correlations among the self-efficacy, communication competency, critical thinking disposition, and clinical performance ability were found. The regression model explained 40.8% of the clinical competency. Self-efficacy, communication competency, critical thinking disposition, and image for the nurse were factors influencing clinical performance ability. Therefore, it is necessary to develop an educational program to improve the self-efficacy, communication competency, and critical thinking disposition of nursing students.
Influence of Clinical practice stress and Communication skills on Ego-resilience of Nursing students
Jo, Eun-Joo ; Lim, Kyoung-Min ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 618~628
DOI : 10.5762/KAIS.2016.17.6.618
This study was conducted to identify the influence of clinical practice stress and communication skills on the ego-resilience of nursing students. The subjects were 122 nursing college seniors in B city who have experience in clinical practice. Data were collected from March 23 to 30, 2015, and analyzed by the t-test, ANOVA, Scheffe's test, Pearson's correlation coefficients and multiple regression. It was found that there were significant differences in the ego-resilience depending on the gender, satisfaction with nursing major and relationships among fellow students during clinical practice. There was a significant positive correlation between ego-resilience and communication skills. The meaningful variables which influence the ego-resilience were communication skills, satisfaction with nursing major, relationships among fellow students during clinical practice and gender. These factors were responsible for 38.9% of the total variance in the ego-resilience of the nursing students, and communication skills were the most influential factor. In conclusion, to increase the ego-resilience of nursing students, it is necessary to develop effective communication training programs and strategies to improve their satisfaction with the nursing major and relationships among fellow students during clinical practice.
Experiences on Block System Class in Nursing Students
Kim, Young-Sook ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 629~641
DOI : 10.5762/KAIS.2016.17.6.629
This study analyzed the use of the phenomenological method proposed by Colaizzi (1978) in order to understand the meaning of block system class experiences in nursing students. Furthermore, this study provides primal data to improve curriculum efficiency. The data were collected from 18 participants who were students at a nursing university in the city of G from 20th of June to 10th of July 2015. This study investigated nursing student's block system class experience. The study results show six theme clusters consisting of 'Discomfort', 'Unsystematic study', 'Holding back an urge', 'Ever intensifying relationship', 'New discovery', and 'Chance for development', 17 themes, and 42 sub themes, which are included in those clusters in 58 configured meanings. This demonstrates that nursing students could reestablish their resolve for personal betterment and realize the importance of managing time by finishing the procedure with their best efforts although they suffer from physical and psychological inconvenience due to massive amounts of learning and assignment. These results indicate the need for development of stress management and an emotional support program based on the experience of nursing students.
Meaning of instructional materials based on the daily work of class Kaon
Kim, Kyung-Chul ; Go, Jin-young ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 642~649
DOI : 10.5762/KAIS.2016.17.6.642
This study examined the meaning of instructional materials by observing the daily work of an infant class in a daycare center to make some suggestions on the accreditation and evaluation of instructional materials for early childhood education and educare. Ethnography was chosen to determine in detail what the instructional materials meant for the selected preschoolers. The activities that belonged to each area of free optional activities and made use of instructional materials were observed, and the eating time, nap time, and outdoor play were all observed. The data were gathered by visiting the selected daycare center. A participant observation and teacher interviews were conducted, and notes were taken on the spot. When their verbal expressions and nonverbal expressions needed to be observed owing to their unique characteristics, a camcorder was used to record their words to have a more profound understanding of them. All the collected data that included this researcher's observation note, the teacher interview data, the standard childcare curriculum manual, the daycare center's yearly, and the daily childcare plans and curriculum evaluation data were classified and categorized by performing an inductive analysis. As a result, the instructional materials had three meanings for the infants. The first was "friends who welcomed them and whom they could play with.' The second was "a cozy nest," and the third was "another teacher." Given the findings of the study, the preparation of standards for instructional materials for infants in childcare facilities is required, and even equipment that is used as instructional materials should be taken into consideration when instructional materials for infants are accredited.
Study on the Flow Characteristics of Urea-SCR Swirl Injector according to the Needle Lift Profile
Gwak, Eun-Jo ; Park, Sung-Young ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 650~655
DOI : 10.5762/KAIS.2016.17.6.650
In this study, a computational simulation of the internal flow characteristics was carried out for a Urea-SCR Injector. A single hole swirl injector with a swirl disk and slanted nozzle was used in this simulation. The maximum needle lift and opening velocity were selected as the design parameters. To analyze the unsteady internal flow characteristics of the Urea-SCR injector, the moving grid technique was applied to simulate the delicate needle movement. According to the simulation results, the injected mass flow rate from the Urea-SCR injector decreased with increasing needle opening velocity and maximum needle lift. This is because the Urea-solution tends to fill the empty space that the needle previously occupied. The swirl flow is decreased as the flow goes through the injector nozzle, because of the friction with the nozzle wall. Also, during the maximum needle lift period, the swirl coefficient and mean swirl coefficient increase with increasing needle lift. The results of this study may be used as the basic design data of related injectors.
The Estimation of Domestic Construction Technology Full-Text Services using Tobit Model
Jeong, Seong-Yun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 656~662
DOI : 10.5762/KAIS.2016.17.6.656
We have provided a variety of domestic construction technology related full-text services through the Construction Technology Digital Library system since 2001. CODIL is a system that services the database related to construction technology data. On the other hand, there is growing demand for DB every year, but the required budget is shrinking. Therefore, this study investigated the satisfaction to effectively service the construction technique-related full-text with a limited budget. The monetary value of full-text to express satisfaction with the quantified value was estimated using the Tobit model. The Tobit model is used as a contingent valuation method to estimate the value of non-market goods. This model is the limited dependent variable regression model to observations by censoring the limit of the left side or right side so that a biased outlier is not reflected in the willingness to pay. A survey was conducted by sampling 312 respondents. The mean, median, truncating the willingness of payment were calculated for the six types of the full-text services using the Tobit model. The statistically significant variables affecting the willingness to pay for the full-text services were identified. The mean value of per the full-text service was estimated to be 46,530 won. The significance of this study was to use the Tobit model to estimate the value of the construction technology-related full-text services for the first time in Korea.
Exploring the Effect of "Tag" on SNS - focus on tagging in Facebook
Bang, Jounghae ; Suh, Hyunju ; Lee, Jumin ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 663~669
DOI : 10.5762/KAIS.2016.17.6.663
This study explores the effect of tagging in Social Network Services, especially Facebook, which has become popular as a marketing platform. In Facebook, users generally make recommendations using 'Like', 'Share', or 'Tag'. 'Tag' is different from 'Like' or 'Share' in that it can be used to deliver certain messages directly to specific people based on their interests or characteristics. Tagging can be categorized into rewarded tagging and non-rewarded tagging. As a result of our exploratory research, we found that non-rewarded tagging by certain users can indicate that the people, who are tagged, are interested in the contents of the users and share the same interest as them. Also, tagging indicates that these users want to share these services, such as restaurants and tours, with their friends who are tagged in the contents. Therefore, this study sheds light on the importance of the tagging function, as well as 'Like' and 'Share'.
Thermal Properties of Polyurethane Elastomers Prepared with MBCA/DMTDA Mixture as Curing Agent
Ahn, Won Sool ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 670~675
DOI : 10.5762/KAIS.2016.17.6.670
Both melting temperature and enthalpy of MBCA/DMTDA mixtures were measured as a function of DMTDA compositions using DSC. The thermal properties of polyurethane elastomer samples prepared with MBCA, DMTDA, and 40/60 MBCA/DMTDA mixture as curing agents were also observed using TGA. MBCA and DMTDA showed good miscibility over the entire composition range, exhibiting individual DSC melting peaks. Peak temperatures were non-linearly reduced as DMTDA concentrations increased, being approximately
in the case of the 40/60 MBCA/DMTDA mixture. Furthermore, melting enthalpy of the mixture was calculated as 3.8 J/g, which was only 4.3% compared to 87.3 J/g of MBCA. Based on these results, crystallization of the mixture was considered to occur very slowly, and the fluidic gel-state of the mixture was visually confirmed to be maintained over 5 days at room temperature. Thermal decomposition of polyurethane elastomer prepared with 40/60 MBCA/DMTDA curative started at about
, which is similar to that observed for DMTDA, only except decomposition behavior over higher temperature of
A Study on the relationship analysis between the K-REITs loaning rate and interest rate variables
Kim, Sang-Jin ; Lee, Joo-Hyung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 676~686
DOI : 10.5762/KAIS.2016.17.6.676
This study analyzed the long term relationship between the K-REITs' lending rate and interest rate variables based on ARDL (autoregressive distributed lag) and also examined the short term relationship based on the ARDL-ECM model. In the results of the empirical test, there is a co-integration relationship among the K-REITs' lending rate, 3 year government bond (rate), 3 year government bond (rate), corporation bond (rate) (AA-, 3year) and general fund loan rate. This means that the K-REITs' lending rate is related to the long term interest rate. The corporate general fund loan rate has a significant correlation with the K-REITs' lending rate in the long term relation and short term adjustment process. The establishment of a management plan by the REITs considering the trends in the corporate general fund loan rate in the decision making process for finance sector borrowings can be practically helpful for the K-REITs.
Study of Engine Oil Jet System Effect on Engine Friction
Min, Sun-Ki ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 687~692
DOI : 10.5762/KAIS.2016.17.6.687
When turbochargers are applied to engines, the temperature of the engine becomes high, making the cooling of pistons very important. To solve this problem, an oil jet is used. The oil jet provides oil to the underside of piston for cooling. When an oil jet is used, oil pump size-up and oil cooler are needed because of the increased oil flow rate and higher oil temperature. On the other hand, these increase the friction torque of the engine. This study examined how much the friction torque of an engine increases by an oil jet, oil cooler, and oil pump size-up. In addition, the proportions of the friction torque of the engine increased by each part were measured by changing the engine assembly condition. At low speed, the oil pump and oil cooler had a larger effect on the friction torque than the other factors. At high speed, oil cooler had a larger effect than the other factors.
A Study of Shrinkage Characteristics of Low Shrinkage Normal Strength Concrete With Boundary Restraint Condition
Jeong, Jun-Young ; Min, Kyung-Hwan ; Lee, Dong-Gyu ; Choi, Hong-sik ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 693~699
DOI : 10.5762/KAIS.2016.17.6.693
In this study, the replacement effects of cementitious materials (fly ash, blast furnace slag, and blended mixtures) were assessed for normal strength concrete with very low shrinkage properties under
strain using a powder type shrinkage reducing agent. In addition, through mock-up tests of actual size walls restrained with four sides, the shrinkage characteristics using the power type shrinkage reducing agent were measured and the crack reducing ability was assessed. The slump and air contents were measured as the properties of fresh concrete, and the length changes of the prismatic specimens,
in size, were measured for the shrinkage characteristics. To reduce the shrinkage of concrete, the maximum replacing ratio of the fly ash is effective to 20 percent; however, the use of blast furnace slag and ternary mixtures did not reduce the shrinkage.
Research on the Decrease of Dud Ammunition Rate of 40mm Grenade(K200) Fuze through Quality Improvement
Ju, Jin-Chun ; Kim, Yong-Hwa ; Ahn, Nam-Su ; Kim, Sang-Min ; Ha, Su-Ra ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 700~707
DOI : 10.5762/KAIS.2016.17.6.700
Recently, ammunition malfunctions of the 40mm grenade were reported during live fire training. When 72 40mm grenades were fired by the army, 11 duds were encountered. The dud ammunition rate was approximately 15%. Because ammunition is used a long time after its manufacture, it is necessary to ensure its performance after long-term storage. In this study, we attempted to decrease the dud ammunition rate of 40mm grenade (K200) fuzes through quality improvement. First, it was determined by the detonator performance test that abnormal explosions occurred due to the degradation of the detonator as a result of its aging characteristics. Second, we improved the fuze quality of the 40mm grenade. Third, we tested its shelf life to estimate its life expectancy. The shelf life of the 40mm grenade fuze obtained using the Arrhenius equation was 6.5 years for the existing grenade fuze and 45.5 years for the improved grenade fuze. This showed that the shelf life of the improved grenade was increased approximately 7 times. Therefore, the improved 40mm grenade fuze contributes to the quality improvement of the 40mm grenade by decreasing the dud ammunition rate during long term storage.
Die Shift Measurement of 300mm Large Diameter Wafer
Lee, Jae-Hyang ; Lee, Hye-Jin ; Park, Sung-Jun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 708~714
DOI : 10.5762/KAIS.2016.17.6.708
In today's semiconductor industry, manufacturing technology is being developed for the purpose of processing large amounts of data and improving the speed of data processing. The packaging process in semiconductor manufacturing is utilized for the purpose of protecting the chips from the external environment and supplying electric power between the terminals. Nowadays, the WLP (Wafer-Level Packaging) process is mainly used in semiconductor manufacturing because of its high productivity. All of the silicon dies on the wafer are subjected to a high pressure and temperature during the molding process, so that die shift and warpage inevitably occur. This phenomenon deteriorates the positioning accuracy in the subsequent re-distribution layer (RDL) process. In this study, in order to minimize the die shift, a vision inspection system is developed to collect the die shift measurement data.
Design of a step-up DC-DC Converter using a 0.18 um CMOS Process
Lee, Ja-kyeong ; Song, Han-Jung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 715~720
DOI : 10.5762/KAIS.2016.17.6.715
This paper proposes a PWM (Pulse Width Modulation) voltage mode DC-DC step-up converter for portable devices. The converter, which is operated with a 1 MHz switching frequency, is capable of reducing the mounting area of passive devices, such as inductor and capacitor, and is suitable for compact mobile products. This step-up converter consists of a power stage and a control block. The circuit elements of the power stage are an inductor, output capacitor, MOS transistors Meanwhile, control block consist of OPAMP (operational amplifier), BGR (band gap reference), soft-start, hysteresis comparator, and non-overlap driver and some protection circuits (OVP, TSD, UVLO). The hysteresis comparator and non-overlapping drivers reduce the output ripple and the effects of noise to improve safety. The proposed step-up converter was designed and verified in Magnachip/Hynix 0.18um 1-poly, 6-metal CMOS process technology. The output voltage was 5 V with a 3.3 V input voltage, output current of 100 mA, output ripple less than 1% of the output voltage, and a switching frequency of 1 MHz. These designed DC-DC step-up converters could be applied to the Personal Digital Assistants(PDA), cellular Phones, Laptop Computer, etc.
A Study on Inflow Rate According to Shape of Dual Structure Perforated Pipe Applied to Seawater Intake System
Kim, Sooyoung ; Lee, Seung Oh ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 721~728
DOI : 10.5762/KAIS.2016.17.6.721
97% of water on earth exists in the form of seawater. Therefore, the use of marine resources is one of the most important research issues at present. The use of seawater is expanding in various fields (seawater desalination, cooling water for nuclear power plants, deep seawater utilization, etc.). Seawater intake systems utilizing sand filters in order to take in clean seawater are being actively employed. For the intake pipe used in this system, assuring equal intake flows through the respective holes is very important to improve the efficiency of the intake and filtering process. In this study, we analyzed the efficiency of the dual structure perforated pipe used in the seawater intake system using 3D numerical simulations and the inflow rate according to the gap of the up holes. In the case of decreasing gaps in the up holes toward the pipe end, the variation of the total inflow rate was small in comparison with the other cases. However, the standard deviation of the inflow rate through the up holes was the lowest in this case. Also, stable flow occurred, which can improve the efficiency of the intake process. In the future, a sensitivity analysis of the various conditions should be performed based on the results of this study, in order to determine the factors influencing the efficiency, which can then be utilized to derive optimal designs suitable for specific environments.
The Preparation and Practical Deinking Property of Liquid Deinking Agent for Recycling of Waste Paper
Chun, Yong-Jin ; Soh, Soon-Young ; Hong, Sang-Euy ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 729~736
DOI : 10.5762/KAIS.2016.17.6.729
It is necessary to recycle and reuse waste paper for preservation of the global environment. Instead of a solid deinking agent, liquid deinking agents have been made using various fatty acids with EO/PO added for higher deinking effect. The removal efficiency of ink on waste paper was evaluated by the ERIC and brightness properties after processes of recycling pulping (sample composition ONP: OMG = 5:5, concentration 15%, temperature
, pulping time 20 min.) and flotation (concentration 1%, temperature
, air flow 7 L/min, time 8 min.). Also, the ink reattachment of paper was evaluated by hyperwashing. The results show that it is effective for mass-preparation to saponify oleic acid with KOH at
and to add EO/PO. This deinking agent was used in a paper plant, and we evaluated the brightness, color, and ERIC. The deinking agent showed excellent performance.
Development of a new armor unit against high waves
Park, Young Hyun ; Youn, Daeok ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 737~743
DOI : 10.5762/KAIS.2016.17.6.737
Coastal hazards such as high waves are expected to increase due to global climate change. Therefore, we investigated new armor unit structures for disaster prevention. Recently, a concrete caisson has been used in many breakwaters against high waves in South Korea, but the demand for concrete armor unit has increased due to the high cost and many installation requirements. Though many new armor units have been developed over the world since Tetrapod in 1950, few have been used due to lack of systematical development. The representative armor units in current use have many advantages, but they cannot be applied to waves higher than 8 m. One of the new armor units developed by the design guide based on recent trend and hydraulic model experiments were conducted. The new armor unit was developed as a single layer due to cost effectiveness. However, the thickness is close to 1.5 times by overlapping the alphabet A and V. It showed higher overtopping compared to a double layer because of the thickness and the high packing density. It has a high interlocking vertically but low horizontally. It shows good stability at 9 m in model testing.
Computer Generated Hologram for Beam Control of LCOS based Wavelength Selective Switch
Lee, Yong-Min ; Han, Chang Ho ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 744~749
DOI : 10.5762/KAIS.2016.17.6.744
This paper presents the design of a computer-generated hologram for beam control of an LCOS-based wavelength selective switch, which is the core technology for next-generation ROADM. By introducing a computer-generated hologram instead of general grating patterns to control the LCOS device, we contribute to building a more efficient wavelength selective switch. With the use of phase modulation properties of LCOS devices, we designed the hologram for five-port output and a 40-channel wavelength selective switch. We applied a multi-level phase modulation technique with the Gerchberg-Saxton algorithm to produce the hologram, which is easily scalable to any different type of wavelength selective switch. With an experimental setup, we verified the usability of the hologram designed for five-port output. We also suggest a hologram design technique for beam control of a 40-channel wavelength selective switch.
Parametric Study on the tendency of Stiffness Variation using Variable Stiffness Mechanism
Ham, KiBeom ; Han, Jiho ; Jeon, JongKyun ; Park, YongJai ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 6, 2016, Pages 750~758
DOI : 10.5762/KAIS.2016.17.6.750
In general, a system can be stable when it is designed with a rigid material. However, the use of a rigid system can be limited, such as grasping a glass or using a small surgical instrument. To resolve this limitation, a variable stiffness mechanism was developed using a flexible material. Previous research verified the variable stiffness mechanism where flexible segments and rigid segments were connected alternately in series. However, research into the design parameters of the variable stiffness structure is needed to satisfy the desired stiffness. Therefore, a variable stiffness structure was tested by varying the design parameters to confirm the trend of the stiffness variation. When the radius of the structure becomes larger, the stiffness increases. The stiffness increased with decreasing length of the flexible segments. Under the same design parameters, the length of the flexible segments had a greater effect on the stiffness than the length of the rigid segments. In addition, the stiffness was estimated using the pseudo rigid body model and was compared with the experimental results. This parametric study can be used as a design guideline for designing the variable stiffness mechanism to satisfy the desired stiffness.