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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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
Development of Wireless Smart Sensing Framework for Structural Health Monitoring of High-speed Railway Bridges
Kim, Eunju ; Park, Jong-Woong ; Sim, Sung-Han ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 1~9
DOI : 10.5762/KAIS.2016.17.5.1
Railroad bridges account for 25% of the entire high-speed rail network. Railway bridges are subject to gradual structural degradation or fatigue accumulation due to consistent and repeating excitation by fast moving trains. Wireless sensing technology has opened up a new avenue for bridge health monitoring owing to its low-cost, high fidelity, and multiple sensing capability. On the other hand, measuring the transient response during train passage is quite challenging that the current wireless sensor system cannot be applied due to the intrinsic time delay of the sensor network. Therefore, this paper presents a framework for monitoring such transient responses with wireless sensing systems using 1) real-time excessive vibration monitoring through ultra-low-power MEMS accelerometers, and 2) post-event time synchronization scheme. The ultra-low power accelerometer continuously monitors the vibration and trigger network when excessive vibrations are detected. The entire network of wireless smart sensors starts sensing through triggering and the post-event time synchronization is conducted to compensate for the time error on the measured responses. The results of this study highlight the potential of detecting the impact load and triggering the entire network, as well as the effectiveness of the post-event time synchronized scheme for compensating for the time error. A numerical and experimental study was carried out to validate the proposed sensing hardware and time synchronization method.
Size and Dispersion Characteristics of Silver Nanoparticles Prepared Using Liquid Phase Reduction Method
Lee, Jong Jib ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 10~16
DOI : 10.5762/KAIS.2016.17.5.10
This work investigates the size and dispersion characteristics of silver nanoparticles synthesized by a liquid phase reduction method using PAA. The experimental variables were the molecular weight and doses of the PAA, reducing agent, dispersant, and organic solvent (ethanol-acetone). UV-visible spectrophotometer results confirm the formation of the silver particles, and SEM indicates size in the nanometer range. As the ultrasonication time increases, there is a tendency toward smaller agglomerates of nanoparticles. The agglomerates were dispersed into 1-5 agglomerates of particles by ultrasonication for 3 hours or more. Relatively spherical nanoparticles were produced with a completely homogeneous dispersion and size of 49.56-85.75 nm by ultrasonication using BYK-192, a dispersant containing copolymer with a pigment affinic group. The average size of the silver nanoparticles was increased to 36.82, 50.66, and 56.06 nm with increasing molecular weight of PAA. Also, the size of the nanoparticles increased with the capping of PAA on the surfaces of the nanoparticles when increasing the amount of PAA. The addition of hydrazine as a reducing agent produced relatively small particles because many nuclei were created by the reduction reaction. The ethanol-acetone solvent helped with the regular arrangement of the silver nanoparticles.
Characteristics of indoor air quality in the overground and underground railway stations
Namgung, Hyeong-Kyu ; Song, Ji-Han ; Kim, Soo-Yeon ; Kim, Hee-Man ; Kwon, Soon-Bark ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 17~25
DOI : 10.5762/KAIS.2016.17.5.17
In this study, the air quality of underground and overground railway stations was evaluated focusing on the degree of influence of the outside air quality. The measured components were particulate matter (
), carbon dioxide (
), carbon monoxide (CO), nitrogen dioxide (
), formaldehyde (HCHO), ozone (
), total airborne bacteria (TAB), total volatile organic carbon (TVOC), and Radon (Rn), which are included in the maintenance standards and recommended standards of the Indoor Air Quality Management Act. Also, the indoor/outdoor concentration ratios of
were calculated to estimate the influence of the outdoor air quality. The concentrations of
, and Rn in the underground stations were found to be higher than those in the overground stations. These results indicate that the (present) generation of contaminants are caused by the indoor source of the underground station. The ozone concentration of the overground stations was higher than that of the underground stations, which indicates that the outdoor ozone concentration influenced that of the overground stations directly. Thus, methods of improving the IAQ should take into consideration the types of contamination.
Dispersion Characteristics of Hydrogen Gas by the Effect of Leakage Hole Size in Enclosure Space
Choi, Jinwook ; Li, Longnan ; Park, Chul-Woo ; Lee, Seong Hyuk ; Kim, Daejoong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 26~35
DOI : 10.5762/KAIS.2016.17.5.26
As a potential clean energy resource, the production and consumption of hydrogen gas are expected to gradually increase, so that hydrogen related studies are also increasing. The thermal and chemical properties of hydrogen result in its high flammability; in particular, there is a high risk if leaks occur within an enclosed space. In this study, we applied the computational fluid dynamics method to conduct a numerical study on the leakage behavior of hydrogen gas and compared these numerical study results with an experimental study. The leakage hole diameter was selected as an important parameter and the hydrogen gas dispersion behavior in an enclosed space was investigated through various analytical methods. Moreover, the flammable regions were investigated as a function of the leakage time and leakage hole size. We found that the growth rate of the flammable region increases rapidly with increasing leakage hole size. We also investigated the relation between the mass flow rate and the critical time when the hydrogen gas reaches the ceiling. The analysis of the monitoring points showed that the hydrogen gas dispersion behavior is isotropic and independent of the geometry. We found that the concentration of gas in an enclosed space is affected by both the leakage flow rate and amount of gas accumulated in the enclosure.
Research on Coupling Control of Adjacent Buildings under Multiple Hazards
Kwag, Shinyoung ; Kim, Hyun-Su ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 36~41
DOI : 10.5762/KAIS.2016.17.5.36
In this study, numerical analyses were used to investigate the performance of a coupling control method for the dynamic responses of adjacent buildings under multiple hazards. Numerical simulations were done using the earthquake loads of regions with strong seismicity in Los Angeles, California, and the wind loads in regions with strong winds in Charleston, North Carolina. The artificial earthquake and wind loads were made using SIMQKE and Kaimal Spectrum based on ASCE 7-10. Ten-story and twenty-story adjacent buildings were selected as example structures, and nonlinear hysteretic dampers were used to connect them. The Bouc-Wen model was used to model the nonlinear hysteretic dampers. The results show that the proposed control method could effectively reduce the dynamic responses, and the optimal control designs were different for each hazard.
Metadata Design Based on Vector Type Geospatial Information Standard for the Collection and Management of Inundation Map
Sim, Gyu-Seong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 42~48
DOI : 10.5762/KAIS.2016.17.5.42
Inundation Maps are used to predict potential areas of flooding through the signs of past flooding and flood inundation analysis for flooding expected in the future, and this has led to the development of various forms of disaster-related services by governments. However, each institution has its own individual scenarios for making maps for spatial expression. Therefore, the type of spatial information is not standardized and has many forms and structures. In this study, we attempted to design the metadata that would allow Inundation Map information to be shared and used in various fields. The international standard, ISO 19115, and the domestic standards, KS X ISO 19115, TTAS.IS - 19115 and TTAS.KO - 10.0139/R1 of TTA, were used in the design to derive an appropriate standard for comparative analysis by dividing into maintenance, constraints, metadata, spatial reference system, identification, and distribution. It is expected that inundation maps will be easier to utilize and distribute among institutions and private companies by systematically collecting and managing them through the metadata design based vector space information standard developed in this study.
Characteristics Analysis of the CM and DM Noise Separator in EMI
Park, Chan-Soo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 49~55
DOI : 10.5762/KAIS.2016.17.5.49
To separate the CM and DM noise in the EMI generated in various electrical electronic systems, passive and active separators have been researched. These separators are an important part of an effective active EMI-filter. The passive separator has some advantages, in that it is easy to realize at a low price and its structure is very simple. However, its major drawback is that its accurate inductor realization and accurate core selection are very difficult. The active separator is smaller in size and more accurate, but its main drawback is that an op-amp which has a broad band frequency response is necessary, its cost is high, and a DC power circuit is required. This paper compares the characteristics of EMI filters which apply the existing passive separator and proposed active separator. It was concluded that an active separator is needed for expensive and accurate equipment, whereas a passive separator is sufficient for inexpensive and general purpose EMI filters.
Research on factors affecting the smartphone addiction of college students based on the GIA
Lim, Young-sook ; Lee, Young-joo ; Han, Suk-jung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 56~66
DOI : 10.5762/KAIS.2016.17.5.56
This study is a descriptive research study which attempts to determine the effects of self-efficacy, self-esteem, loneliness, stress, stress coping, and use expectancy on the smartphone addiction of university students based on the GIA model. Data was accumulated by means of questionnaire surveys from December 2015 to January 2016, which targeted 224 college students attending universities within Seoul and analyzed by descriptive statistical analysis, correlation analysis, and multiple regression analysis using SPSS 21.0. The average smartphone addiction score was
(1.2-4.9) and 125 students were in the normal category (55 %), 90 in the danger category (40.2%), and 9 in the addiction category (4%). The correlation analysis showed that loneliness and stress had positive correlations with use expectancy, while self-esteem had a negative correlation. Loneliness, stress, use expectancy, and self-esteem proved to be the major factors affecting smartphone addiction and it was concluded that the development and application of programs which strengthen self-esteem are necessary. This study contributed to the research application and availability of the GIA model by analyzing the factors affecting smartphone addiction based on the GIA model.
ICT based Wireless Power Transmission System Development
Lee, Jong-Hee ; Bang, Junho ; Chun, Hyun-Jun ; Seo, Beom-Geun ; Ryu, In-Ho ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 67~73
DOI : 10.5762/KAIS.2016.17.5.67
Recently, wireless power transmission has attracted much interest and is the subject of much research in industry and academia. As its name implies, it is a technology which involves transferring power without wires. This paper presents the design of an ICT-based wireless power transmission system. The proposed system consists of a wireless transceiver unit and high-efficiency coil unit, which can increase both the transmission efficiency and the effective power distance. In particular, the wireless transceiver unit was designed to work with the ICT technique to enable real-time remote monitoring. Also, studies were done relating to the effect of reducing the standby power. The optimal frequency of IGBT devices used in industrial wireless power systems of 20[KHz] was utilized. The values of
were selected for L and C, respectively, through many field experiments designed to optimize the system design. In addition, an output current controlling algorithm was developed for the purpose of reducing the standby power. The results presented in this paper represent a 75[%] to 85[%] higher power transmission efficiency with a 10[%] increase in the effective power transmission distance compared with the existing systems. As a result, the proposed system exhibits a lower standby power and maintenance costs. Also, the designed wireless transceiver unit facilitates fault detection by means of user acquired data with the development of the ICT applied program.
Design of Congestion Standardization System Based on IoT
Kim, Mi-Rye ; Cho, In-Ho ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 74~79
DOI : 10.5762/KAIS.2016.17.5.74
The Seoul Metropolitan Subway, which started operating in 1974, plays a major role in transporting 7,289 thousands passengers daily. This trend of a steadily increase in passengers from 2012 has increased the congestion rate because of the limited capacity and time. To solve this problem, Seoul city is consistently working on improving the subway facilities, such as the construction of a detour path. This project, however, has only a slight effect on improving the congestion rate and is too expensive to construct the facilities. Hence, this study suggests The Congestion Standardization System based on the IoT for improving the subway congestion rate. Based on the system, the expected effect analysis was performed, which resulted in a decrease in ride passengers from 34 to 20. In addition, this expected effect analysis shows that the number of subway vehicles can increase from 20 to 24. The suggested system will have a significant effect on the efficiency of the management system.
A study on the properties of the carbon long-fiber-reinforced thermoplastic composite material using LFT-D method
Park, Myung-Kyu ; Park, Si-Woo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 80~85
DOI : 10.5762/KAIS.2016.17.5.80
Carbon fiber-reinforced composite materials have been widely used in various industrial fields, but there are limits to increasing their strength and stiffness, because of the short-length fibers that are impregnated in them. In this study, a lab-scale small extruder system was developed with the capability to perform the carbon fiber impregnation and extrusion process in order to evaluate the properties of long-length carbon fiber reinforced thermoplastic composite materials molded by the LFT-D method. Specimens were made with the small extruder to press-mold long-length carbon fiber composite materials and evaluate their material properties. As a result, it was found that the carbon fiber length, press load and carbon fiber contents have a considerable influence on the strength and stiffness. Additional studies on such factors as the mixing screw design and coating of the carbon fiber are needed in order to improve the mechanical properties of carbon fiber composite materials.
Factors influencing empathy for the elderly in nursing students
Yang, Hyun Joo ; Kim, Hyun Jung ; Byun, Eun Kyung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 86~94
DOI : 10.5762/KAIS.2016.17.5.86
The purpose of this study was to investigate the factors influencing empathy with the elderly in student nurses and to provide the basic data on nursing education to improve empathy. Data were collected from 277 student nurses in B and C cities and analyzed by the t-test, ANOVA, Pearson correlation coefficients, and multiple regression using SPSS WIN 20.0. The degree of empathy with the elderly in the student nurses was
. There were positive correlations between empathy and attitude of the elderly (r=.224, p<.001) and between empathy and facilitative communication (r=.346, p<.001), and these factors explained 15.4% of the empathy with the elderly. These results indicated that it is necessary to develop a nursing education program and curriculum for increasing empathy in student nurses.
Ego resilience, Empathic Ability and Interpersonal relationship ability in Nursing Students
Chae, Myung-Ock ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 95~103
DOI : 10.5762/KAIS.2016.17.5.95
This study examines the relationships among ego resilience, empathic ability, and interpersonal relationship ability in nursing students. Data were collected through a self-reported questionnaire from November 2 to December 11, 2015. The subjects consisted of 299 nursing students who were selected using a convenience sampling method. Stepwise multiple regression revealed that ego resilience (
, p<.001) and empathic ability (
, p<.001) were significant predictors and accounted for 47.2% of interpersonal relationship ability. It is meaningful that ego resilience affects interpersonal relationship ability. Therefore, ego resilience and empathic ability need to be increased by efficient management and intervention to facilitate interpersonal relationship ability in nursing students.
A Study on the Relationship between Individual Patient Behavior, Medical Care Level and Therapeutic Compliance: Community Health Survey
Kim, Young-Ran ; Lee, Tae-Yong ; Park, Chang-Soo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 104~115
DOI : 10.5762/KAIS.2016.17.5.104
Objective: This study was conducted in order to investigate the effects of individual patient behavior regarding the health and medical care level on their therapeutic compliance for people diagnosed with high blood pressure by a physician, in order to evaluate the impact of treatment compliance. In this study, the therapeutic compliance was defined as the hypertension drug cure rate. The current blood pressure controls were persons about 30 years of age diagnosed with high blood pressure by their doctor one month fraction of the people who take more than 20 days (30 days). Methods: The data was analyzed by using the X2-test for different comparisons of the therapeutic compliance in the individual characteristics and using a two-stage multilevel logistic regression to identify the community variance of the related index of high blood pressure therapeutic compliance using the data from 229 adults over the age of 19 in a community health survey conducted in 2010. The Spss 18.0 statistical program was used with HLM 7 (hierarchical linear model) Results: It was found that the rate of therapeutic compliance was affected by the individual health behavior and health and medical care levels. Conclusion: In this study, although the odds ratio of the variable region of the high level of health care, I was able Unlike previous studies and focuses on the personal level of variation found variations in the local health care level was a significant. More studies on multilevel analysis are needed in the future considering regional level data.
Influence of Liquidity on the Housing Market before and after Macroeconomic Fluctuations
Lee, Young-Hoon ; Kim, Jae-Jun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 116~124
DOI : 10.5762/KAIS.2016.17.5.116
In the past, once apartments were built by housing construction companies, their presale went smoothly. Therefore, the developer and construction companies in Korea were extremely competitive in the housing market. However, when the 1997 foreign exchange crisis and 2008 global financial crisis occurred, the quantity of unsold new housing stocks rapidly increased, which caused construction companies to experience a serious liquidity crisis. This paper aims at analyzing the influence of Liquidity on the Housing Market before and after Macroeconomic Fluctuations using VECM. The periods from September 2001 to September 2008 and from October 2008 to October 2015, which were before and after the Subprime financial crisis, were set as Models 1 and 2, respectively. The results are as follows. First, it is important to develop a long-term policy for the housing transaction market to improve household incomes. Second, due to the shortage in the supply of jeonse housing, structural changes in the housing market have appeared. Thus, it is necessary to seek political measures to minimize the impact of transitional changes on the market.
The stress experience of nurses who are reemployed after career interruption
Soun, Eun-Jin ; Eom, Jae-Hyeon ; Nam, Eun-Sook ; Chae, Young-Ran ; Kil, Myung-Sook ; Park, Eun-Ha ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 125~136
DOI : 10.5762/KAIS.2016.17.5.125
The purpose of this study is to qualitatively examine the nature of the stress experience of nurses in reemployment after career interruption using a phenomenological method. The subjects were nurses who were reemployed after working in medical institutions and experiencing three years or more of career interruption. The collected data showed five categories of themes: "the gaps between reality and earlier expectations," "getting hurt because of the worsening relationship with younger superiors," "struggling to adapt oneself to the changing work environments," "getting exhausted as a supermom," and "struggling to survive as a professional." The findings suggest that career-interrupted nurses who are considering finding a new job should be educated to make decisions on where to work. They should be provided with the right information on the environments of hospitals and with educational programs before reemployment to establish their roles as professional nurses. In addition, it is important to increase the diversity and accessibility of retraining programs that can adapt to the changing healthcare environment. It is necessary to develop career break programs so that nurses can successfully adapt to reemployment, to promote professionalism in the work environment, and to look for ways that can inspire nurses who have experienced career interruption.
The Expression of Sublime in Gothic Novel - William Faulkner's A Rose for Emily
Ryu, Da-Young ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 137~145
DOI : 10.5762/KAIS.2016.17.5.137
We are accustomed to using the word 'beautiful' when we see something, but we don't use the word 'sublime' very often. In fact, these two words have totally different meanings and we can say 'sublime' only for special objects. The notions and objects of sublime have been studied by numerous philosophers ranging from Longinus to Burke and Kant. According to their studies, we can feel sublimity from objects which give us fear, because the sublime is inherent in fear. Therefore, in this study, we considered the sublime in the gothic novel, A Rose for Emily, in which we can find solemn sublimity in Emily's iron gray hair, her black suit, and a red rose which stands for blood. In addition, we can feel sublimity in the image of Emily who is waiting for Homer and the image of Homer's dead body. These kinds of images instill us with fear, but also show us tragic sublimity. The sublime exists in all kinds of literature and, therefore, more studies and analyses of the sublime in literature will likely be conducted.
A Study on Multi-Physics Analysis of High-Resolution Winding Type Resolver and Rotary Transformer
Shin, Young-Chul ; Kim, Ki-Chan ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 146~152
DOI : 10.5762/KAIS.2016.17.5.146
This paper describes a multi-physics analysis of a high resolution winding type resolver and rotary transformer using FEM (Finite Element Method). The rotary transformer boosts the input voltage to a high voltage which can be input into the rotor windings of the resolver. Through multi-physics models of the transformer and resolver, the characteristics of the output signals for the resolver system with high resolution can be derived. Moreover, the circuit model of the interface part between the transformer and resolver should be considered, because of the calculation of the input current to the resolver. The winding type resolver is composed of 32x and 1x stator windings for high resolution. Then, the output signals of the stator windings, which make sinusoidal SIN and COS waves with a
phase difference, are verified.
Development of Technology and Enterprise Assessment Model for Commercialization of Public Technology
Kim, Taeil ; Song, Joo-Young ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 153~163
DOI : 10.5762/KAIS.2016.17.5.153
Intellectual output, such as research papers and patents, has increased due to the consistent investment of the government R&D budget, however, the economical outcome leaves much to be desired. These unsatisfactory results originate from the lack of information sharing about the technology's business compatibility and enterprise's business capability between technology supplier and technology user. This study aims at investigating the decision making process of technology commercialization by proposing an assessment model of the technology's business compatibility and enterprise's business capability. The assessment model was completed by selecting the key index through a literature survey, field survey and consultation with experts. The technology assessment model can be effectively utilized for technology licensing, technology start-up and technology selection in R&BD projects. However, the assessment indexes required for the basic science are not investigated in this study and some assessment indexes are differently interpreted by the individual appraisers. The assessment model will be improved through field application and additional studies will be conducted to develop the assessment model of basic science.
Factors Influencing Health-related Quality of Life in Patients with Coronary Artery Bypass Graft
Kim, Jiyoung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 164~172
DOI : 10.5762/KAIS.2016.17.5.164
The purpose of this study was to determine the relationships among the social support, depression, and health-related quality of life and the factors affecting the health-related quality of life in patients with coronary artery bypass graft (CABG). The subjects consisted of 134 patients who had received CABG from S general hospitals in Seoul, Korea, and the results were analyzed using the SPSS Win 21.0 program. The physical component summary (PCS) was significantly different depending on the age (F=4.616, p=.004), gender (t=3.657, p<.001), education (F=7.688, p=.001), current job (t=-4.363, p<.001), spouse (t=-3.065, p=.003), and underlying disease (F=3.078, p=.030) of the subjects. There were differences in the scores for the mental component summary (MCS) according to their gender (t=2.243, p=.027) and monthly income (F=2.821, p=.041). A significant negative correlation was found between social support and depression (r=-.415, p<.001). Social support had a statistically significant positive correlation with the MCS (r=.261, p=.002). Significant negative correlations were found between depression and the PCS (r=-.459, p<.001) and MCS (r=-.554, p<.001). The depression and underlying disease accounted for 36.7% of the variance in the PCS. The depression accounted for 34.1% of the variance in the MCS. Based on these results, nurses should develop nursing intervention programs for patients who have undergone CABG which take into consideration their depression.
An Experimental Study for Longitudinal Resistance of Ballast Track on Bridge
Min, Kyung-Hwan ; Yun, Kyung-Min ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 173~178
DOI : 10.5762/KAIS.2016.17.5.173
When a ballast track of a high-speed train is constructed on a bridge, the displacement of the bridge decks can occur because they are not fixed to the rails. Moreover, relative displacements occur between the bridge and rails caused by temperature changes and external loads. The current longitudinal resistance criteria (UIC Code 774-3, KR C-08080) on ballast tracks with continuous welded rails (CWRs) do not take into account the longitudinal movement of the bridge and the frictional force between the ballast and slabs. In addition, the magnitude of the longitudinal resistance, k, is calculated somewhat conservatively and, (therefore?) it acts as an unfavorable element in the design of long span and continuous railway bridges. Thus, in order to replicate the actual behavior more effectively, the longitudinal resistance of CWRs should take into account the additional rigidity between the slab and track. In this study, the longitudinal resistances of the ballasted track on the bridge were analyzed by carrying out an experimental study with a test setup designed to simulate the deck and bed track. In the test results, the maximum longitudinal resistances of the tests were similar to the resistances of the current codes, however, the measured longitudinal stiffness designed to limit the displacement of the tests were much smaller in comparison with the longitudinal stiffness on the codes.
The Impacts of Speculative Trading on Commodity Prices After the Global Financial Crisis
Kim, Hwa-Nyeon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 179~185
DOI : 10.5762/KAIS.2016.17.5.179
This study verifies whether speculative trading in commodity markets acted as the primary cause of the increase in commodity prices after the global financial crisis using the Structural Vector Autoregressive (SVAR) model. The effects of speculative trading on commodity prices increased by a factor of 3 to 6 after the crisis compared to those before the crisis. Although the demand related variables, such as industrial production, affected commodity prices significantly before the crisis, their effects decreased after the crisis. Consequently, the rebound of commodity prices after the crisis was mainly caused by the increase in speculative money, fortified by the expansion of the global liquidity supply. The global liquidity may well increase in the future, because the U.S. Federal Reserve Board is likely to continue to increase its interest rate. This study claims that when global liquidity shrinks as a result of a change in the Fed's monetary policy stance, speculative trading will slow down, leading to a decline in commodity prices.
The emotional response that has an influence on achievement goal and ability to performance of senior citizen sport instructor
Park, Yeon-Hee ; Choi, Hwan-suk ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 186~194
DOI : 10.5762/KAIS.2016.17.5.186
This study was conducted to determine whether if the emotional response of participants influences senior citizens at a senior citizen center and to develop the qualities and skills of the instructors of the senior citizens. Not only will we provide effective materials but also provide basic materials as well. The emotional response of interpersonal relationships, achievement goal of ability to performance, and influence of orientating themselves. Additionally, the emotional response of interpersonal relationships, ability to concentrate, and confidence. Finally, the achievement goal of task orientation, concentration of ability to performance on orientating oneself, as well as confidence. Therefore, we will be able to determine if the emotional response of a participant influences achievement of a goal and of the effectiveness of senior citizen instructors. This will not only help with practical and cultural issues, but will close the distance between the instructors participants based on consideration of their situational aspects. Furthermore, the sports activities and continued participation of the elderly. Always need to be ready mentally, and rather than the consideration of others as well as the game results, it is important to have an interest in achieving their own standards. Instructors toned to lend support while setting goals for the participants so that they contribute to the personal development and overall quality of life of the participants.
A Evaluation of Direct Payment on Agricultural Income effect using Farm Manager Registration Information
Han, Suk-Ho ; Chae, Gwang-Seok ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 195~202
DOI : 10.5762/KAIS.2016.17.5.195
The government has run and managed various forms of direct payment systems, such as the paddy and field direct payment, to ease the instability of farm incomes with respect to market opening, and preserve farm income. Direct payments to the agricultural sector is a center in the key policy instrument that plays an important role in income stabilization. Despite the large amount of spending in the farm unit, the status of direct payment, and policy effects the analysis of direct payments, such as stability of income contribution, are insufficient. This paper, using the farm unit DB in 2014 and 2015, performed farm level analysis of direct payment, and derived the implications of the performance evaluation system. As a result, the distribution of direct payment showed considerable bias to the left side compared to the normal distribution curve. Approximately half of the farms (49.3%) in 2014 DB should receive below 100,000 won per year by a direct payment. A larger-scale farm showed a significantly increased income effect and income stabilizing effect because direct payments make higher contributions to farm income in proportional to the area. In the more elderly farmers, a high contribution by direct payment to farm income was found to be an advantage; however, in small-scale farms of less than 0.5ha, direct payment contribution on farm household income was only 3%. In large-scale farms, 10ha or more, the contribution to farm income were found to be 29.4%. The income of large farms was 10 times larger than small farmers, and the direct payment entitlements that were received were 110 times larger. Through this policy, direct payments are required for future improvements and modifications.
A study on the Prevention of Deep Vein Thrombosis and Skin Response of Patients after Intracranial Surgery : By Boots and Calf Intermittent Pneumatic Compression Device
Cho, Moo-Yong ; Kim, Boon-Han ; Kim, Ki-Sook ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 203~212
DOI : 10.5762/KAIS.2016.17.5.203
This study examined the prevention of deep vein thrombosis and skin response after the application of boots or calf intermittent pneumatic compression (IPC) devices in immobile patients with intracranial surgery. The subjects of this study included 60 patients in a surgical intensive care unit after receiving intracranial surgery from May to November in 2015. The blood flow velocity was measured daily to assess the deep vein thrombosis for 7 days, and the skin response of the legs was observed regularly. As a result, the boots IPC group showed an increased blood flow velocity over time compared to the calf IPC group. A significant statistical difference was observed in both the boots IPC group and calf IPC group over time (Right side; F=64.41, p<.001, Left side; F=58.21, p<.001). The dorsum circumference over time and the correlations between two groups (Right side; F=9.13, p <.001, left side; F=9.29, p<.001) also showed a significant difference. In addition, the boots IPC group showed no skin complications. In conclusion, the boots type IPC is a more effective method for preventing deep vein thrombosis for immobile patients with intracranial surgery.
A Study on the Creative Elements of Popular Music
Kim, Hye Jung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 213~218
DOI : 10.5762/KAIS.2016.17.5.213
Music copyright began in 1850 in France and, unlike other copyrighted works such as architecture or arts, which are based on visual conditions, copyrighted music is based the on trends of the times. The appropriate range of protection for musical works is not the entire music, but the part that is determined to be a creative expression deduced from the analysis of the musical structure. Concerning the issue of plagiarism in popular music, the determination of creativity plays an important role in whether a piece of music encroaches on the original copyrighted works or not. However, determining whether a work is an element of a previously copyrighted work should be achieved through a consensus formed by members of the relevant industry and academia rather than the court. The purpose of this study is to classify the creative and non-creative elements of popular music, in order to create a classification that can enable musical creators to provide a consensus on the elements of creative expression.
Issues of Income Tax on the Compensation for Employee Invention of the University
CHEE, Seonkoo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 219~226
DOI : 10.5762/KAIS.2016.17.5.219
There has been some controversy about imposing income tax on the compensation for university employees' inventions. In this research, various issues of taxation related to such compensation are examined, with Supreme Court Judgement 2014Du15559 as a means of understanding the confusion associated with this taxation. An amendment of the Income Tax Law is proposed based on the examination results, in order to promote research in the university field, which is able to make various types of compensation for employee inventions fall into the category of tax exemptions. It is concluded that if the Income Tax Law is amended to refer to the definition of technology in the Technology Transfer and Commercialization Promotion Act, instead of that of the Invention Promotion Act, the compensation resulting from newly emerging IPRs and technical know-how, which are currently taxed, can become tax exempt.
A Study on Influential Relations between Stress and Smartphone Addiction among College Students: With a Focus on the Mediating Effects of Depression and Self-Efficacy
Sim, Mi Young ; Lee, Dool Nyeo ; Kim, Eun Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 227~236
DOI : 10.5762/KAIS.2016.17.5.227
This study tested the effects of stress on smartphone addiction via depression and self-efficacy among college students, and the analysis results were as follows: setting mediator and extra variables significantly correlated with the criterion variable as covariates and applying the regression analysis and SPSS Macro as well as bootstrapping method, to verify the mediating effects of depression and self-efficacy in stress and smartphone addiction. This study analyzed the direct effects of stress on the depression, self-efficacy, and smartphone addiction of college students and found that stress had direct effects on their depression and self-efficacy and also indirect effects on their smartphone addiction via depression and self-efficacy. Both depression and self-efficacy had dual and partial mediating effects on the influences of stress on their smartphone addiction. Stress had significant dual mediating effects on their smartphone addiction via the indirect paths of depression and self-efficacy, and high stress also had significant direct effects on their smartphone addiction, thus validating the dual mediation model. These findings demonstrate the need to develop programs to mitigate the stress and depression of college students and enhance their self-efficacy in order to reduce their smartphone addiction.
Displacement Measurement of Cable Stayed Bridge using Digital Image Processing
Son, Byung Jik ; Jeon, Seung Gon ; Heo, Gwang Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 237~242
DOI : 10.5762/KAIS.2016.17.5.237
This paper introduces a method of measuring the displacement of a cable-stayed bridge using digital image processing (DIP). The validity of the DIP technique was confirmed by comparing the results with those obtained using a displacement meter and ANSYS analysis. The normalized cross-correlation (NCC) coefficient was used. 100 kgf and 200 kgf loading experiments were carried out, which showed that when the displacement is large, the reliability of the DIP technique is increased. That is, when the load was increased from 100 kgf to 200kgf, it decreased from 31% to 14% compared to the ANSYS results and from 14% to 4% compared to the displacement meter results. Therefore, the image processing method is able to measure the displacement sufficiently accurately.
Effects of Rhythm Exercise Training on Body Composition and Arterial Compliance in Elderly Females
Kim, Daeyeol ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 243~250
DOI : 10.5762/KAIS.2016.17.5.243
The body composition and arterial compliance with advanced age increase the risks of cardiovascular diseases, but the elderly can perform rhythm exercise easily, which may positively influence their body composition and arterial compliance. Therefore, this study examined the effects of rhythm exercise training on the body composition and arterial compliance in elderly females. The subjects (n=20) were assigned randomly to either an exercise group (n=10, EX) or non-exercise control group (n=10, CON). The rhythm exercise training for 12 weeks consisted of 3 sessions per week with 60 minutes per session. In addition, the intensity was set to 11-14 of the Borg scale (6-20). The body composition and arterial compliance (pulse wave velocity (PWV)) were measured before and after training. The skeletal muscle mass in the EX was increased significantly (p=0.04) and the right (p=0.002) and left side (p=0.02) of the PWV in the EX were decreased significantly, but the skeletal muscle and both sides of the PWV in the CON were not changed. Elderly females could easily perform rhythm exercise training, which resulted in improvements of the skeletal muscle mass and arterial compliance. Therefore, rhythm exercise training may prevent or delay sarcopenia and reduce the risk of cardiovascular diseases.
Characteristic of Mixing and DO Concentration Distribution in Aeration Tank by Microbubble Supply
Lim, Ji-young ; Kim, Hyun-Sik ; Park, Dae-Seok ; Cho, Young-Gun ; Song, Seung-Jun ; Park, Soo-Young ; Kim, Jin-Han ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 251~259
DOI : 10.5762/KAIS.2016.17.5.251
This study examined the DO concentration distribution and ORP distribution using microbubbles on pilot-scale aeration tanks. As a result of MLSS mixing and oxygen transfer phenomenon using microbubbles, different DO concentrations were observed depending on the circulation of the liquid with the microbubble supply location on the lateral of an aeration tank. The simulation results of CFD (computational fluid dynamics) program showed that MLSS mixed with a microbubble supply in the middle the reactor is much better than on the left side of the reactor. A single reactor containing an anaerobic, anoxic, and aerobic zone, was evaluated without partition according to the location of the microbubble supply based on the experiments and CFD analysis. MLSS was separated into solid-liquid by the microbubble supply in the aeration tank. Consequently, selecting the appropriate microbubble size is important for MLSS mixing and was maintained at the proper DO concentration for biological treatment.
Effects of Depression, and Physical Activity on Fatigue among Elderly with Chronic Disease
Lee, Eun-Ju ; Park, Euna ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 260~268
DOI : 10.5762/KAIS.2016.17.5.260
The objective of this study was to investigate the relationship among the variables and effects of depression and physical activity on fatigue in the elderly with chronic disease. A descriptive research design was employed in this study. In total, 500 elderly patients diagnosed with chronic disease were selected from 3 medical centers for the study. The measurements were used to examine their general characteristics, fatigue, depression, and physical activity. To analyze the data, statistical analyses, including ANOVA, t-test, Scheffe's test, Pearson's correlation coefficient, and hierarchical regression analysis, were conducted for the analysis of the data. The results indicated that the age, gender, and educational level in the first step model explained 6% of the effect on fatigue among the elderly with chronic disease. In addition, depression and physical activity in the second step model explained 16% of the effect on fatigue. These findings demonstrate the significance of (considering) depression and physical activity related to care plans when developing health-programs for decreasing fatigue and planning intervention strategies.
Development of Pulsating Type Electromagnetic Hammer Drive Systems
Ahn, Dong-Jun ; Nam, Hyun-Do ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 269~274
DOI : 10.5762/KAIS.2016.17.5.269
This paper proposes the development of a low frequency electronic hammer drive system that is used to prevent scaling or clogging in the hopper process. The electro-mechanical hammering driving method involves the generation of vibration and impact energy. The operation principles of the electromagnetic hammer were considered by parallel/series spring coefficient analysis and the amount of kinetic energy generated was calculated from the product of the equivalent spring constant, which is coupled with the E core and the gap of between the E core and I core. In addition, the Pulsation Driving algorithm was applied to the proposed electromagnetic hammer to obtain the maximizing kinetic energy. This algorithm was then implemented by a logical AND operation process and micro-controller (atmega128) built in functions with a timer interrupt and PWM generation function. The driving circuit of the electromagnetic hammer was designed using the H-bridge type IGBT circuit. The experimental test was performed by usefulness of the developed electromagnetic hammer systems with the acceleration measurement method. The experimental result showed that the proposed system has good kinetic energy generation performance and can be applied to the hopper process.
Quality Tests for the Knee-Orthosis Velcro and Locking System
Jung, Se-Wook ; Seo, Won-San ; Cho, KiHun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 275~283
DOI : 10.5762/KAIS.2016.17.5.275
In this study, three knee-orthoses (dial lock type, medium size, right side) were used for a quality level test (static bending test and solidity test of the locking system) of the knee-orthosis locking system. In the static bending test, a smaller maximum load was observed in samples A and C compared to the reference standard value (KS P 8408 standard value: 1000 N, sample A: 865 N, sample C: 833 N). In addition, in the solidity test of the locking system, a smaller maximum load was observed in the all samples compared to the referenced standard value (KS P 8411 standard value: 200 N, sample A: 41 N, sample B: 97 N, sample C: 54 N). Korean industrial standards for knee-orthoses and systematic test methods are lacking. Therefore, a systematic management plan for knee-orthoses is required. The result of the current study showed that a systematic management plan for the knee-orthosis locking system is required. In particular, the development of a quantitative and objective test method is needed. The findings of the current study may be useful for monitoring the quality of the knee-orthosis locking system and may provide foundational information for the development of a quantitative and objective test method.
Extensional Vibration Analysis of Curved Beams Including Rotatory Inertia and Shear Deformation Using DQM
Kang, Ki-Jun ; Park, Cha-Sik ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 284~293
DOI : 10.5762/KAIS.2016.17.5.284
One of the most efficient procedures for the solution of partial differential equations is the method of differential quadrature. The differential quadrature method (DQM) has been applied to a large number of cases to overcome the difficulties of complex algorithms of computer programming, as well as the excessive use of storage due to the conditions of complex geometry and loading. The in-plane vibrations of curved beams with extensibility of the arch axis, including the effects of rotatory inertial and shear deformation, are analyzed by the DQM. The fundamental frequencies are calculated for members with various slenderness ratios, shearing flexibilities, boundary conditions, and opening angles. The results are compared with the numerical results obtained by other methods for cases in which they are available. The DQM gives good mathematical precision even when only a limited number of grid points is used, and new results according to diverse variations are also suggested.
The Current Situation and Development Strategies of the Intermediary Agencies in the Private Sector -The Case of Industrial Councils in Chungnam Province-
Ko, Kyung-Ho ; Kim, Tae-Yeon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 294~304
DOI : 10.5762/KAIS.2016.17.5.294
This study aims at identifying the development strategies for capacity building of intermediary agencies from the survey and analysis of intermediary agencies in the private sector which play an important role in the economic development of Chungnam province. From the review of the literature, we defined the concept of intermediaries as an institute or program which builds and maintains the proper relationship among the various actors. In order to determine the current situation of intermediary agencies and their roles in Chungnam province, we selected nine private industrial institutes and carried out a questionnaire and interview survey. It was identified that they have very limited knowledge of the role of intermediaries, while mainly focusing on the traditional function of lobbying groups. Therefore, a policy needs be developed to allow them to participate in regional development projects, in order to improve their capability to facilitate network activities for regional economic development.
A study on the improvement of work flow and productivity in complex manufacturing line by employing the effective process control methods
Park, Kyungmin ; Jeong, Sukjae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 305~315
DOI : 10.5762/KAIS.2016.17.5.305
Due to the change from small volume production to small quantity batch production systems, individual companies have been attempting to produce a wide range of operating strategies, maximize their productivity, and minimize their WIP level by operating with the proper cycle time to defend their market share. In particular, using a complex workflow and process sequence in the manufacturing line has some drawbacks when it comes to designing the production strategy by applying analytical models, such as mathematical models and queueing theory. For this purpose, this paper uses three heuristic algorithms to solve the job release problem at the bottleneck workstation, product mix problem in multi-purpose machine(s), and batch size and sequence in batch machine(s). To verify the effectiveness of the proposed methods, a simulation analysis was performed. The experimental results demonstrated that the combined application of the proposed methods showed positive effects on the reduction of the cycle time and WIP level, and improvement of the throughput.
Inconsistent Parenting Attitude Research Trends and Reliability and Feasibility Analysis of Measurement Tool
Choi, Jin ; Kwon, Ho-Jang ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 316~324
DOI : 10.5762/KAIS.2016.17.5.316
The purpose of this study is to review existing research trends to find highly reliable tools for measuring inconsistencies in parenting attitudes for adolescent children. We reveal factors that heavily affect reliability and feasibility of these tools and compose stable measurement items. We found a total of 37 items with high reliability and feasibility comprising six questions on affection, three questions on childcare, nine questions on interest, seven questions on demands, five questions on neglect, and seven questions on abuse. We surveyed first to third-year high school students in public and private schools nationwide and carried out statistical analysis for the 1,020 respondents. Upon analysis, questions were removed if they showed low factor loading (less than 0.6) for the father and mother in each of the 37 measurement items. Only questions that could be used for both the father and mother were extracted to carry out exploratory factor analysis. Eight questions were were deleted: five on interest, one on demands, one on neglect, and one on abuse. The final 29 questions were selected for the measurement tool. Cronbach's Alpha coefficient was used to analyze reliability, which showed high reliability values ranging from .857 to .931 for the father and mother. Therefore, these inspection tools for inconsistent parenting attitude were both reliable and feasible.
Flood fragility analysis of bridge piers in consideration of debris impacts
Kim, Hyunjun ; Sim, Sung-Han ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 325~331
DOI : 10.5762/KAIS.2016.17.5.325
This research developed a flood fragility curve of bridges considering the debris impacts. Damage and failures of civil infrastructure due to natural disasters can cause casualties as well as social and economic losses. Fragility analysis is an effective tool to help better understand the vulnerability of a structure to possible extreme events, such as earthquakes and floods. In particular, flood-induced failures of bridges are relatively common in Korea, because of the mountainous regions and summer concentrated rainfall. The main failure reasons during floods are reported to be debris impact and scour; however, research regarding debris impacts is considered challenging due to various uncertainties that affect the failure probability. This study introduces a fragility analysis methodology for evaluating the structural vulnerability due to debris impacts during floods. The proposed method describes how the essential components in fragility analysis are considered, including limit-state function, intensity measure of the debris impact, and finite element model. A numerical example of the proposed fragility analysis is presented using a bridge pier system under a debris impact.
Factors Influencing Posttraumatic Growth of North Korean Defectors in South Korea
Kim, Yun Ah ; Kim, MiYoung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 332~338
DOI : 10.5762/KAIS.2016.17.5.332
This study examined the posttraumatic growth of North Korean defectors, the relation between their characteristics and posttraumatic growth and the factors influencing their posttraumatic growth, and explored methods of improving their mental health status. 145 North Korean defectors, who were trained in B city and G city, participated in the survey from February 1 to March 10, 2016. The posttraumatic growth, resilience, self-esteem, deliberate rumination, and impact of the (traumatic) event were measured using the PTGI (Posttraumatic Growth Inventory), RS (Rumination Scale, Resilience Scale), SES (Self-esteem Scale) and ISR (Impact of Event). The data were analyzed using the t-test, ANOVA, Pearson correlation coefficient and stepwise multiple regression. The mean scores were 29.64 for posttraumatic growth. There were significant positive correlations between posttraumatic growth and resilience and between posttraumatic growth and rumination. The influence of the independent variables on the total posttraumatic growth was examined using regression analysis. Models including the variables (resilience, positive self-esteem, and rumination) explained 54.2% of the variance for the posttraumatic growth. These findings demonstrate that it is essential for nurses to continuously intervene and help North Korean defectors so as to promote their posttraumatic growth and resilience. Furthermore, it is also necessary for nurses to find ways to develop ideal interventions in order to activate deliberate rumination.
Mosaic Detection Based on Edge Projection in Digital Video
Jang, Seok-Woo ; Huh, Moon-Haeng ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 339~345
DOI : 10.5762/KAIS.2016.17.5.339
In general, mosaic blocks are used to hide some specified areas, such as human faces and disgusting objects, in an input image when images are uploaded on a web-site or blog. This paper proposes a new algorithm for robustly detecting grid mosaic areas in an image based on the edge projection. The proposed algorithm first extracts the Canny edges from an input image. The algorithm then detects the candidate mosaic blocks based on horizontal and vertical edge projection. Subsequently, the algorithm obtains real mosaic areas from the candidate areas by eliminating the non-mosaic candidate regions through geometric features, such as size and compactness. The experimental results showed that the suggested algorithm detects mosaic areas in images more accurately than other existing methods. The suggested mosaic detection approach is expected to be utilized usefully in a variety of multimedia-related real application areas.
Development and Application of Siphon Breaker Simulation Program
Lee, Kwon-Yeong ; Kim, Wan-Soo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 346~353
DOI : 10.5762/KAIS.2016.17.5.346
In the design conditions of some research reactors, the siphon phenomenon can cause continuous efflux of water during pipe rupture. A siphon breaker is a safety device that can prevent water efflux effectively. However, the analysis of the siphon breaking is complicated because many variables must be included in the calculation process. For this reason, a simulation program was developed with a user-friendly GUI to analyze the siphon breaking easily. The program was developed by MFC programming using Visual Studio 2012 in Windows 8. After saving the input parameters from a user, the program proceeds with three steps of calculation using fluid mechanics formulas. Bernoulli's equation is used to calculate the velocity, quantity, water level, undershooting, pressure, loss coefficient, and factors related to the two-phase flow. The Chisholm model is used to predict the results from a real-scale experiment. The simulation results are shown in a graph, through which a user can examine the total breaking situation. It is also possible to save all of the resulting data. The program allows a user to easily confirm the status of the siphon breaking and would be helpful in the design of siphon breakers.
Relationships between Knowledge, Attitude and Preventive Behavior about Tuberculosis in Service Workers
Kang, Seung-Rang ; Kim, Eun-Young ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 354~363
DOI : 10.5762/KAIS.2016.17.5.354
This study examined the relationships among levels of knowledge, attitude and preventive behavior regarding tuberculosis in service workers. The survey period was 1 - 7 October, 2015 with service workers who work in large scale stores in Jeonnam. The collected data were analyzed using an independent t-test, ANOVA, and Pearson's correlation coefficients using the SPSS WIN 12.0 program. The mean score for knowledge about tuberculosis was
, the mean score of attitude toward tuberculosis was
and the mean score of preventive behavior for tuberculosis was
. Preventive behavior was found to have significant relationships with gender, marital status, smoking, job satisfaction, and subjective health status. A slightly positive correlation was observed between the knowledge of tuberculosis and the attitudes toward tuberculosis. A positive correlation was noted between the attitude toward tuberculosis and preventive behavior for tuberculosis, while there was a negative correlation between the preventive behavior and age. Therefore, is necessary to consider the related factors for the development and implementation of systematic education programs that can encourage and promote preventive behavior for tuberculosis among service workers.
Prediction of Assistance Force for Opening/Closing of Automobile Door Using Support Vector Machine
Yang, Hac-Jin ; Shin, Hyun-Chan ; Kim, Seong-Kun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 364~371
DOI : 10.5762/KAIS.2016.17.5.364
We developed a prediction model of assistance force for the opening/closing of an automobile door depending on the condition of the parking ground. The candidates of the learning models for the operating assistance force were compared to determine the proper force according to the slope and user's force, etc. The reduced experimental model was developed to obtain learning data for the estimation model. The learning algorithm was composed to predict the assistance force to incorporate real assistance force data. Among these algorithms, an Artificial Neural Network (ANN) and Support Vector Machine(SVM) were applied and the adaptability was compared between these models. The SVM provided more adaptability for the learning process of the door assistance force prediction. This paper proposes a system for determining the assistance force to control a door motor to compensate for the deviation of required door force in the slope condition, as needed in the plane condition.
Investigation on Construction Process and Efficiency of Underwater Construction Equipment for Rubble Mound Leveling works
Won, Deokhee ; Jang, In-Sung ; Shin, Changjoo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 372~378
DOI : 10.5762/KAIS.2016.17.5.372
A mound was constructed to install a caisson and sofa blocks underwater. The mound riprap, which were of uniform grade, size, shape, and specific gravity, formed the foundation for the support superstructure. Also, rubble leveling works were performed before installing structures such as caissons. In this study, underwater construction equipment was developed with a remotely controlled operating system and underwater environment monitoring system for unmanned underwater rubble leveling work. The performance of the developed equipment was verified using on-land and underwater tests. In addition to the performance verification, the construction process and economic efficiency of the equipment should be checked before applying it to the real construction field for commercial purposes. In this paper, a construction process using the developed equipment was proposed and compared with the existing rubble leveling method. The results demonstrated that the new construction method has higher economic efficiency and safety than the existing construction method.
A Study on the Planning Technique of High-rised Housing Estates Applying Smart Green City Concept : Focus on Multi-functional Administrative City 2-1 Neighborhood
Lee, Seo-Jeong ; Lee, Eung-Hyun ; Oh, Deog-Seong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 379~387
DOI : 10.5762/KAIS.2016.17.5.379
The goal of this research is to identify the planning techniques of high-rise housing estates applying a smart green city concept in order to understand the necessity of integrating 'planning & building' planning techniques and 'smart system' planning techniques and to analyze the current status of application. For the research, firstl, the definition of smart green city was established and high-rise housing estates planning was categorized according to a three space hierarchy, seven planning directions and 17 major features through literature review. Second, 28 'planning & building' planning techniques and 'smart system' planning techniques were derived through literature review and FGI analysis. Last, four cases in Multi-functional Administrative City were analyzed for the current status of application of planning techniques. In conclusion, planning techniques in 'Transportation Network', 'Environment-friendly layout planning of housing', 'Revitalization of green transportation', 'Utilization of new & renewable energy', 'Crime prevention and accident reduction', 'Use of high performance, and efficiency facility' main feature were identified as important planning techniques for Smart Green City and its implications were estimated.
A Study on the Effects of Socioeconomic Traits on Local Resident Education in Slow City
Park, Hee-Jung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 388~396
DOI : 10.5762/KAIS.2016.17.5.388
The concept of the Slow City originates from the philosophy that seeks nature and a human-centric lifestyle. The objective of this study is to provide education for local residents in the socioeconomic traits of Slow City. For this study, 445 residents were surveyed about the concept of the Slow City. Using the survey results, t-test and regression analyses were conducted to find areas of improvement by considering the significance and effect level. The purpose of this study is to suggest a strategy of education for local residents based on the effect of socioeconomic traits on the residents' attitude and education satisfaction. The findings showed that local residence is more influential on the residents' attitude than age, income and education and that the number of participations in the education did not affect education satisfaction. This result suggests that more reinforced and improved local resident education should be offered for the Slow City education of residents. This study provides a convenient set of indicators for a strategic focus to develop education programming and policy for Slow City residents.
Improving the Stability of Gel Mass of Vegetable Soft Capsule
Lee, Yeon Hui ; Weon, Kwon Yeon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 397~404
DOI : 10.5762/KAIS.2016.17.5.397
The objective of this study is to determine the physical characteristics of the gel mass of vegetable soft capsules and to maintain their rheological stability for improving manufacturability. The effect of each capsule shell component on the viscosity of the gel mass was studied for 6 hours, and the effects of adding an alkalizer or electrolytes to neutralize the sulfate groups on the carrageenan molecule were also investigated. Carrageenan was identified as a major component that affects the viscosity of the gel mass, and it showed unstable properties with age. The viscosity and stability of the gel mass were remarkably improved when an alkalizer or electrolytes were added at 3.0% relative to the carrageenan. 3.6 M KCl showed the highest effect on increasing the viscosity. A stable gel mass composition for vegetable soft capsules was successfully developed, which can be considered to increase the application of the capsules in the pharmaceutical and food industries.
Study on the Determinant Factors of New Town Residents' Living Intention - Focused on the Residents of Bundang New Town
Kim, Yong-Jin ; Kim, Seong-Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 405~411
DOI : 10.5762/KAIS.2016.17.5.405
Given the importance of ensuring continued residency and maintenance of the 1st Planned New Town, which is the first of more than 20 such projects, this study aims to identify the factors determining the residents' living intention. The results show that age, gender, length of stay, and occupancy type are significant factors influencing their living intention. Among the environmental factors, the educational environment and shopping environment are crucial. This means that in order to achieve the "Ageing in Place" concept, it is necessary to improve the educational environment, provide a variety of commercial facilities and expand the living facilities. While it has no direct influence on the pros and cons of building remodeling, the results showed that when the living intention is used as a parameter, the transportation, educational, and shopping environment have an indirect influence on the pros and cons of building remodeling.
Effects of Open Laboratory Self-directed Practice on Knowledge, Self-confidence, and Skill Competency of Intramuscular Injection
Yun, So-Young ; Choi, Soon-Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 412~420
DOI : 10.5762/KAIS.2016.17.5.412
This study examined the effects of open laboratory self-directed practice on knowledge, self-confidence, and skill competency of intramuscular injection in nursing students. This was a quasi-experimental study using a non-equivalent control group pre-posttest design, and the participants were 32 students comprising an experimental group and 30 students comprising a control group. The experimental group was allowed to perform an open laboratory self-directed practice and traditional practice, and the control group performed traditional practice only. The score of knowledge of the control group was significantly higher than that of the experimental group (F=3.59, p=.019), and those of the self-confidence (F=2.26, p=.016) and skill competency (F=9.08, p<.001) of the experimental group were significantly higher than those of the control group. Open laboratory self-directed practice was effective in improving the nursing students' self-confidence and skill competency. Therefore, students should be encouraged to actively participate in open laboratory self-directed practice and the effective strategies should be developed.
The Effects of a gerontological nursing clinical practice course using action learning on undergraduate nursing students
Kwon, Sang Min ; Kwon, Mal-Suk ; Park, Jee-Yeon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 421~427
DOI : 10.5762/KAIS.2016.17.5.421
This study was conducted to examine the effects of a gerontological nursing clinical practice course using action learning on undergraduate nursing students. The subjects were 75 undergraduate nursing students from Y University. Data were analyzed using SPSS/Win 21.0. There were significant improvements in problem solving (t=3.58, p<.001) and communication (t=4.15, p<.000) in the experimental group compared to the control group. This study provides evidence that gerontological nursing courses improve undergraduate nursing students' problem solving and communication skills. Accordingly, this course would be a useful teaching and learning method in nursing programs of outcome based curriculum.
The Influence of Emotional Labor, Job Stress, and Burnout on Turnover Intention of Care Worker's at Long-Term Care Hospitals
Youn, Soon-Chul ; Kwon, Suhye ; Kang, Hyo-Jeong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 428~440
DOI : 10.5762/KAIS.2016.17.5.428
The purpose of this study was to identify the extent of and relationships among emotional labor, job stress, burnout and turnover intention and the factors influencing the turnover intention of care workers at long-term care hospitals. The study was approved by KUIRS, and the data were collected from August 12 to September 30, 2015, and analyzed using the SPSS WIN 18.0 program. The participants of this study were 200 care workers at ten different long-term care hospitals in B city and G province. Data were collected through self-reported questionnaires and analyzed by descriptive statistics, the t-test, ANOVA, Pearson's correlation coefficients, and Stepwise multiple regression. The turnover intention was significantly correlated with emotional labor (r=.372, p<.001), job stress (r=.471, p<.001), and burnout (r=.411, p<.001). In the multiple regression, job stress (
, p<.001), burnout (
, p<.001), type of employment (
, p<.001), and emotional labor (
, p=.017) were identified as factors influencing the turnover intention. These factors explained 32.6% of the total variance in the turnover intention. Based on the results, in order to reduce the turnover intention, the improvement of work environment and clear job-descriptions are needed to reduce the job stress, and the development and implementation of proactive psycho-social interventions are necessary to reduce burnout and emotional labor in care workers at long-term care hospitals.
Influence of Nursing Satisfaction, Self-Esteem and Depression on Adjustment of the Elderly in Long-term Care Hospital
Lee, Kyoung-Mi ; Jo, Eun-Joo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 441~451
DOI : 10.5762/KAIS.2016.17.5.441
This study was conducted to determine the influence of satisfaction, self-esteem, and depression on adjustment of elderly patients in long-term care hospitals. The subjects were 116 elderly patients in 15 long-term care hospitals in B and K city. Data were collected from February 14 to March 30, 2015, and analyzed by t-rest, ANOVA, Scheff's test, Pearson correlation coefficients, and stepwise multiple regression. According to the results, there were significant differences in adjustment by religion, marital status, economic status, and perceived level of difficult problems. Adjustment was positively related to satisfaction and self-esteem. In addition, a negative correlation was observed between adjustment and depression. Meaningful variables that influenced the adjustment of elderly patients were depression, satisfaction, self-esteem, and religion. These factors accounted for 53.5% of the total variance in adjustment of the elderly patients in long-term care hospitals, and depression was the most influential factor. In conclusion, development and implementation of effective programs and strategies to reduce depression and to increase satisfaction with care and self-esteem is needed in order to enhance the adjustment of elderly patients in long-term care hospitals.
A Study on Caregiver's Perception of Restraints
Kang, Hye-kyung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 452~458
DOI : 10.5762/KAIS.2016.17.5.452
This is a descriptive study on visiting caregivers' perception of restraint use. Data were collected from 113 caregivers working at long-term facilities using a structured questionnaire from Feb to March 2016. The caregivers' perception of restraint use was the medium score. The items they considered the most important reasons for the restraints was "Protecting an older person from falling out of bed", which was primarily intended to prevent accidents of the elderly. The score of the knowledge of restraint use was 11.23 points out of 18 and those affected were more than 50 years of age. The attitude score to the use restraints was 9.19, and caregivers thought it should be possible to refrain from using restraints. Work experience of 3 years or less were higher. The perception of using restraints is affected by the knowledge and attitudes of restraint use. This is very important for the elderly in long-term care facilities and is related to health and human rights. Therefore, it is important to provide continuous education related to the use of restraints and regulations on their management.
Different Patterns of Behavioral and Psychological Symptoms of Dementia and Caregiver Burden according to Dementia Type in Nursing Home Residents
Gang, Min-Suk ; Choi, Hyun-A ; Hyun, Jin-Sook ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 459~469
DOI : 10.5762/KAIS.2016.17.5.459
The purpose of this study was to examine different patterns of behavioral and psychological symptoms of dementia (BPSD) and caregiver burden according to dementia type. Data were collected from June 2014 to December 2014 from five nursing homes. In all, 214 patients [131 patients with Alzheimer's disease (AD) and 83 patients with Vascular dementia (VD)] were included in the study. BPSD and caregiver burden data were examined using NPI-NH (Neuropsychiatric Inventory Nursing Home Version). According to the results, both the AD and VD group showed the highest frequency in apathy/indifference and the frequency of anxiety, elation/euphoria, and irritability/lability was significantly higher in the AD group than in the VD group. The difference in total BPSD composite scores between the AD and VD groups was not significant but agitation/aggression was significantly higher in the AD group than in the VD group. The mean score for caregiver burden was significantly higher in the AD group than in the VD group, particularly in agitation/aggression. In conclusion, BPSD differed according to dementia type, and nurses should provide specific interventions to control BPSD; a program to reduce caregiver burden according to dementia type is also needed.
The Analysis of Research Trend about Utilization of Electronic Media in Early Childhood Education -based on Smart Device-
Hwang, Ji-Ae ; Kim, Sung-Jae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 470~477
DOI : 10.5762/KAIS.2016.17.5.470
This study analyzed the research trends concerning the use of smart devices by young children, such as smart phones, tablet PCs, interactive whiteboards and teacher assistant robots, which has begun to be mentioned relatively recently, and attempted to analyze the characteristics of the research trends and provide guidelines for the direction of future research. A search of articles related to the use of electronic media by young children using an Online Search DB revealed a total of 192 research papers, which were analyzed according to the subject of research, teaching-learning method, area of development and area of activity. It was found that the teaching-learning method, teacher education and professionalism were highly prevalent in the subject of research; the education method integrating play activity with literature activity were highly prevalent in the teaching-learning method; language development and social development were highly prevalent in the area of development; and language activity and social activity were highly prevalent in the area of activity.
An Impact Analysis of Idle Space Regeneration Types on Regional Revitalization
Choi, Jin-Wook ; Lee, Joo-Hyung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 478~489
DOI : 10.5762/KAIS.2016.17.5.478
Recently, there has been increasing interest in the remodecycling options of idle spaces around the central city through the urban regeneration. Various studies to create new added value through this way are ongoing. This study aims to analyze the impact relationship and structure on the regeneration of idle space by types affecting the quality of residents' life and local economy revitalization. The hypothesis was verified by a suitability test for setting the hypothesis and statistical significance test from the PLS 3.0 package. The results of this study drew 6 hypotheses from a total of 11 on the 'idle space regeneration of economy based type of PLS-SEM' and 4 hypotheses from a total of 11 on the 'idle space regeneration of neighborhood regeneration type PLS-SEM'. The results can be summarized into several parts. First, if cultural aspects should be considered, the regeneration of idle space (economy-based type and neighborhood-regeneration type) could meet 2 parts, such as the quality of residents' life and local economy revitalization at the same time. Second, improving the 'physical aspects' only affects the 'idle space regeneration of the economy-based type of PLS-SEM'. Third, improving the 'social aspects' only affects the 'idle space regeneration of neighborhood regeneration type of PLS-SEM'. This study has significance in that it provides the empirical analysis for the regeneration of idle space and there are differences according to types of PLS structural model.
A study on measurement of the pollution levels and disinfection of medical radiation shielding for lead apron
Kim, Hyeon-Ju ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 490~497
DOI : 10.5762/KAIS.2016.17.5.490
This study compared and analyzed the pollution levels of radiation shielding aprons and ways to sterilize them using 30 lead aprons. After collecting samples from the center of the lead apron, where contact is most frequent, experiments were conducted employing Coagula and Latex methods. Using the culture medium where bacteria grew, measurements of the pathogen count and identification were performed. The greatest number of pathogens were
, which were detected on the lead apron from general X-ray room #2, but there was no significant difference according to the facilities (p > 0.05). Compared to how many pathogens remained between using the disinfectant ethanol and tissue, the pathogens decreased by
(p < 0.05) after using disinfectant ethanol and by
(p < 0.05) after using disinfectant tissue. The Pearson correlation test revealed a significant correlation (-0.296, p < 0.05) between them. According to this research, there were pathogens on the lead aprons and the number of pathogens was determined by statistical analysis. It is expected that the rate of radiology technologists, patients, and medical equipment infected by pathogens will be reduced by the proper use of sterilization with a disinfectant ethanol.
Relationship of Academic Stress, Sociality and Self-Directed Learning in Nursing Students
KIM, EUN-HEE ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 498~505
DOI : 10.5762/KAIS.2016.17.5.498
The purpose of this study is to investigate the levels of academic stress, sociality, and self-directed learning in nursing students, and to examine the relationship between the variables. Data were collected using a self-administered questionnaire from 208 students in the first and second years of a nursing program. This study was performed from December 5 to December 10, 2015. The data were analyzed with SPSS WIN 18.0 software (SPSS Inc., Chicago, IL, USA). The results were as follows. The mean score of academic stress was
, that of sociality was
, and that of self-directed learning was
. There was a negative correlation between academic stress and self-directed learning (r=-0.16, p=0.024) and a positive correlation between sociality and self-directed learning (r=0.17, p=0.015). Higher academic stress correlated with lower self-directed learning, while higher sociality correlated with higher self-directed learning. The results indicate that the levels of academic stress, sociality, and self-directed learning in nursing students can influence the quality of nursing education. Thus, there is a need to develop programs to reduce academic stress and to help improve sociality and self-directed learning for nursing students.
Relating Factors on Depressive Symptoms among the Elderlies in Urban Areas
Baek, Jong-Tae ; Lee, Hu-Yeon ; Cho, Young-Chae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 506~515
DOI : 10.5762/KAIS.2016.17.5.506
The purpose of this study was to identify the factors associated with the levels of depression of the elderly (living in urban areas). Interviews were performed during the period from July 1, 2015 to August 31, 2015 of 386 elderly people in urban areas. The mean score of depressive symptoms was significantly higher in the subjects of higher age, lower educational level, living alone, having a lower monthly income, relying on government subsidy for their living expenses, having a chronic illness, lower state of subjective health, without regular exercise, poorer subjective sleeping time, lower frequency of going out, irregular eating habits, depending on some level of help for their ADL and IADL, and having lower self-esteem and social support. The depressive symptoms showed a meaningful positive correlation with ADL and IADL and a negative correlation with self-esteem and social support. On multiple regression analysis, the meaningful variables related to their depressive symptoms were their education, monthly income, subjective health status, ADL, self-esteem, and social support. Also, according to the variables was 54.1% of depressive symptoms. Therefore, it is considered that the practice of physical and mental health care, as well as social support, is required to reduce the level of depression in the elderly.
The study on the operation of fire fighting vehicle for a long railway tunnel
Kwon, Tae-Soon ; Park, Won-Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 516~521
DOI : 10.5762/KAIS.2016.17.5.516
In this study, we investigated the operation of railroad fire fighting vehicles against fires on trains in a long railway tunnel. In recent years, long railway tunnels (more than 10 km in length) have been built and the number of such tunnels, such as the Geumjeong tunnel (20.3 km in length) on the Gyeongbu high speed line, Solan tunnel (16.7 km in length) on the Yeongdong line and Yulhyeon tunnel (50.3 km in length) on the Suseo high speed line which is scheduled to be opened in the second half of 2016, is increasing. Significant damage is to be expected, due to the increased evacuation time and limited accessibility of fire services when the train is stopped by an urgent fire in the tunnel. Special fire fighting vehicles capable of running on rails have been developed and operated in overseas advanced countries. Therefore, a fire-response system using Unimog vehicles, which can run on road and rail, instead of road vehicles, is necessary. The characteristics of the railway tunnel and thermal environmental change caused by a train fire in a tunnel were analyzed in this study. Also, the operational requirements of the railroad fire fighting vehicles were evaluated by taking into account the specifications of the railroad fire fighting vehicles under development.
Effect of Backward Walking Exercise on ROM, VAS score and Proprioception in Anterior Cruciate Ligament Reconstruction Patients
Moon, Dae-Hyung ; Oh, Du-Hwan ; Zhang, Seok-Am ; Lee, Jang-Kyu ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 522~529
DOI : 10.5762/KAIS.2016.17.5.522
This study examined the effects of 4-weeks of backward walking exercise on ROM, VAS (Visual Analogue Scale) score and proprioception in anterior cruciate reconstruction patients. Fourteen subjects were randomly assigned to either a backward walking group (BWG, n=7) or a control group (CON, n=7) and then participated in rehabilitation program for 4 weeks. The ROM of the flexion significantly decreased in both groups (BWG, p<0.001 vs CON, p<0.01), while ROM of extension significantly decreased only in the BWG (p<.05) post exercise, but no significant difference was observed between groups. Additionally, VAS score decreased significantly in both groups (P<0.001) and BWG was lower than CON post exercise (p<0.001). Finally, proprioception decreased significantly in both groups (BWG, p<0.001 vs CON, p<0.05), but did not differ significantly between groups. These results suggest that the 4 week backward walking rehabilitation program improves ROM, VAS score, and proprioception and has positive effects on functional recovery of anterior cruciate ligament reconstruction patients.
Analysis of driver behavior related to frontal vehicle collision direction
Lee, Myung-Lyeol ; Kim, Ho-Jung ; Lee, Kang-Hyun ; Kim, Sang-Chul ; Lee, Hyo-Ju ; Choi, Hyo-Jueng ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 530~537
DOI : 10.5762/KAIS.2016.17.5.530
This study investigates frontal crashes, analyzes the driver's action related to the change of the collision direction and determines the severity of (bodily injury). This study was conducted from August, 2013, to January, 2014, and the data for the car damage and human body damage were collected by emergency medical teams. In terms of data collection, we collected the accident vehicle, crash direction, body damage, etc., based on the Korea In-depth Accident Study (KIDAS) and Injury Severity Score (ISS). We used Minitab 17 and SPSS 22.0 to do the frequency analysis and ANOVA. In the analysis results, the prevalence of frontal collisions was 55.8% and mostly occurred in the 12 o'clock direction. In the analysis of the frontal crash direction according to age, the average ages for the 11, 12 and 1 o'clock directions were
, respectively, so the older age drivers had a high probability of the accident occurring in the 1 o'clock direction. In the analysis of men's frontal collision direction according to age, the average ages in the 11, 12 and 1 o'clock directions were
, respectively, so older aged men had a high probability of having collisions in the 1 o'clock direction. However, the statistical analysis of the frontal crash direction according to age in women didn't show any meaningful trend. When comparing the ISS according to age of the men and women in the collision direction, the men were less likely to have a 12 o'clock collision when
and more likely to have a 1 o'clock collision when ISS<9. As a result, frontal crashes are more likely to occur in the 12 o'clock direction and the ISS decreases because the likelihood of frontal crashes in the 1 o'clock direction increases with increasing age. Therefore, when men recognize that they are heading for a 12 o'clock direction collision, they try to steer to the left to reduce the body damage.
An empirical study on the relationship of personal optimistic bias and information security awareness and behavior in the activity of information ethics
Choi, Jong-Geun ; Che, Myung-Shin ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 538~547
DOI : 10.5762/KAIS.2016.17.5.538
With respect to the factors affecting information security awareness and behavior, the study of the relevance of the concept of optimistic bias is actively used in psychology. In other words, this study examines whether the optimistic bias of individuals affects information security in the field. In this sense, this study attempted to demonstrate the relevance of optimistic bias in information security behavior and awareness. A questionnaire survey was conducted targeting 111 people engaged in domestic private enterprises. The survey results showed that this personalized optimistic bias exists because of empirical factors related to personal security. Optimistic bias affects the security awareness information. The greater the optimistic bias, the lower the awareness and recognition of information security. In other words, optimistic bias affects information security awareness. Reducing the effects of optimistic bias is expected to reduce information security incidents, such as information leakages. However, the variety of information related ethical activities of a company did not have any effect on the information security awareness. Most previous studies have only examined the effect optimistic bias in the field of health. Therefore, this study fills an important gap in research in IT.
Correlation between Subjective and Objective Cognitive-Linguistic Tests in Older Adults
Lee, Mi-Sook ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 548~556
DOI : 10.5762/KAIS.2016.17.5.548
Cognitive-linguistic changes that normally accompany aging are often simply an annoyance, but in some instances they may herald a more perilous course of decline to a state of neurological disease. This study investigated the correlation between subjective and objective tests on cognitive-linguistic abilities in older adults and the predictors of objective performances. Healthy elders over 65 years of age (n=63) and their informants (n=63) completed the subjective and objective cognitive-linguistic tests (ISCOLE and CAPTBI) from July of 2015 to February of 2016. The main findings were as follows: performance on the self-report test was not significantly different from that on the informant-report test. Additionally, eight domains in older adults group and 15 domains in the informants group were significantly associated with performance on the objective test. Finally, language on the informant-report test was a predictor of several abilities including problem solving and memory on the informant-report test predicted executive function and language. The present study demonstrates that two groups have significant differences in correlation between subjective and objective tests on the cognitive-linguistic abilities, and there are more relevant domains in rating by informants. These findings have implications for the use of cognitive-linguistic evaluation and preventive intervention in clinical settings.
Analysis of Influence for Breach Flow According to Asymmetry of Breach Cross-section
Kim, Sooyoung ; Choi, Seo-hye ; Lee, Seung Oh ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 557~565
DOI : 10.5762/KAIS.2016.17.5.557
The risk of collapse in hydraulic structures has become more elevated, due to the increased probability and scale of flooding caused by global warming and the resulting abnormal climatic conditions. When a levee, a typical hydraulic structure, breaks, an enormous breach flow pours into the floodplain and much flood damage then occurs. It is important to accurately calculate the breach discharge in order to predict this damage. In this study, the variation of the breach discharge with the asymmetry in the cross-section of the levee breach was analyzed. Through hydraulic experiments, the cross-section of the breach was analyzed during the collapse using the BASD (Bilateral ASymmetry Degree), which was developed to measure the degree of asymmetry. The relationship of the breach discharge was identified using the BASD. Additionally, the variation of the breach flow measured by the BASD was investigated through a 3-D numerical analysis under the same flow conditions as those in the experiment. It was found that the assumption of a rectangular breach cross-section, which is generally used for the estimation of the inundation area, can cause the breach discharge to be overestimated. According to the BASD, the breach flow is decreased by the interference effect in the breach section of the levee. If the breach flow is calculated while considering the BASD in the numerical analysis of the flooding, it is expected that the predicted inundation area can be estimated accurately.
The Study for Incidence Trends of Colorectal Cancer in Jeju-do
Chang, Weon-Young ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 566~573
DOI : 10.5762/KAIS.2016.17.5.566
The age-adjusted incidence rate (AAR) of colorectal cancer in Korea peaked in 2011 and then began to decline. However, the AAR of colorectal cancer in Jeju increased continually from 1999 to 2013. Compared with the 16 major cities in Korea, the inhabitants of Jeju-do have a low cancer screening program participation rate, high alcohol consumption rate and high BMI. The present study aimed to provide a statistical basis for the lowering of the incidence of colorectal cancer in Jeju-do. The Jeju regional cancer institute data from 1999 to 2013 was used to analyze the between Jeju-do and Korea using the Joinpoint Regression program (Statistical Methodology and Applications Branch, Surveillance Research Program, National Cancer Institute) Version 4.2.0 - April 2015. The AAR of colorectal cancer in Jeju-do has being increasing because of the increase in the rates of male colon cancer (average annual percent change 8.422%, p-value<0.000), female colon cancer (AAPC 6.136%, p-value<0.000), male rectal cancer (AAPC 4.221%, p-value 0.003) and colon cancer in people aged over 50 years (AAPC 7.986% p-value<0.000). The results of this study suggest that the treatment of precancerous lesions of the male rectum and lowering of the incidence of colon cancer in people aged over 50 years are necessary to reduce the colorectal cancer incidence rate in Jeju-do.
Feasibility of Exporting Korean major Non-Timber Forest Products in Japan Market
Bark, Ji-Eun ; Eun, Jong-Ho ; Koo, Ja-Choon ; Lee, Sang-Min ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 574~581
DOI : 10.5762/KAIS.2016.17.5.574
Exports of Korean non-timber forest products to the Japanese market decreased 46.3% from 17.54 million dollars in 2010 to 9.42 million dollars in 2014. This research aims to find the appropriate strategies for exporting Korean non-timber products, such as chestnut, shitake, persimmon, and wild ginseng. We applied conjoint analysis to investigate the preferences of Japanese homemakers for Korean non-timber products. The results are as follows: (1) There is a clear distinction in the preference for the attributes and levels of products; (2).Korean products are preferred to Chinese products, but have lower competitiveness than Japanese products; (3) Japanese homemakers responded sensitively, not to the forest product prices, but to changes in their specific attributes. These results can be used to promote the export of Korean non-timber products to the Japanese market.
Hemiplegic Experience after Stroke among Middle Aged Man
Oh, Soo-Yong ; Lee, Jeong-Seop ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 582~593
DOI : 10.5762/KAIS.2016.17.5.582
This study is a qualitative one that used a phenomenological study method to provide basic data for nursing practice by understanding the essence and meaning of middle aged men's hemiplegic experience after stroke. At D hospital which is located in S city, 8 hemiplegic participants who were hospitalized between 24th November, 2014, and 6th December, 2014, participated in in-depth interviews. The experiences of the participants were categorized into 6 criteria, viz. 'Thorny path on a long journey', 'Broken brakes', 'Crossroads of the mind', 'Burden of head of household', 'Signpost that lights the darkness', and 'Route to a second life', and 16 theme clusters were included in these categories. As the sequelae and complications, such as physical pain, psychological conflict and role disorder, due to stoke in middle aged men, seriously affect their quality of life, this study attempted to understand the effect of these problems and provide new insight into nursing practice. Also, it is important to prevent the recurrence of stroke in the patients, facilitate their recovery, and help them to maintain healthy lives through the reestablishment of their role in the home and society, including through the resolution of their physical and psychological problems.
Numerical Study on Characteristics of Gas Leakage in an Underground Combined Cycle Power Plant
Bang, Joo Won ; Sung, Kun Hyuk ; Ryou, Hong Sun ; Lee, Seong Hyuk ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 594~600
DOI : 10.5762/KAIS.2016.17.5.594
The present study numerically investigated the gas leakage characteristics in a simplified underground combined cycle power plant. The effect of obstacles near a crack location on the gas concentration in the confined space was analyzed by using the lower flammable limit (LFL) of methane gas. When the jet flow was close to the vertical walls, the longitudinal leakage distance increased by about 60% (when an obstacles was present) compared to the case without any obstacle, because these obstacles prevented transverse flows. In addition, when an air filter was installed near to the trajectory of the gas flow, the longitudinal leakage distance was similar to the distance between the crack and obstacle, whereas the transverse leakage distance increased up to 8 times compared to the case without any obstacle. As the jet flow impacts on the obstacle and changes its direction, the gas flows recirculate. Therefore, it is necessary to consider the effect of the structure and facility locations on the trajectory of the jet flow to propose an accident prevention system in confined spaces.
A Study on Isolation Performance of High Damping Rubber Bearing Through Shaking Table Test and Analysis
Kim, Hu-Seung ; Oh, Ju ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 601~611
DOI : 10.5762/KAIS.2016.17.5.601
The research, development and use of seismic isolation systems have been increasing with the gradual development of structure safety assurance methods for earthquakes. The High Damping Rubber Bearing (HDRB), one type of seismic isolation system, is a Laminated Rubber Bearing using special High Damping Rubber. However, as its damping function is slightly lower than that of the Lead Rubber Bearing, a similar seismic isolation system, its utilization has not been high. However, the HDRB has a superior damping force to the Natural Rubber Bearing, which has similar materials and shapes, and the existing Lead Rubber Bearing has a maleficence problem in that it contains lead. Thus, studies on HDRBs that do not use lead have increased. In this study, a test targeting the HDRB was done to examine its various dependence properties, such as its compressive stress, frequency and repeated loading. To evaluate the HDRB's seismic performance in response to several earthquake waves, the shaking table test was performed and the results analyzed. The test used the downscaled bridge model and the HDRB was divided into seismic and non-seismic isolation. Consequently, when the HDRB was applied, the damping effect was higher in the non-seismic case. However, its responses on weak foundations, such as in Mexico City, represented increased shapes. Thus, its seismic isolator.
Effects of Stray Light in Blue-light Blocking Lens on the Quality of Image
Yuk, Ju Sung ; Yang, Seok-Jun ; Kim, Yong Gwon ; Choi, Eun Jung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 612~618
DOI : 10.5762/KAIS.2016.17.5.612
The aim of this study is to investigate the effects of stray light originating from the blue-light blocking lens on the quality of the image. After designing the ideal spectacle lens, anti-reflection spectacle lens without internal reflection, anti-reflection spectacle lens with internal reflection, and blue-light blocking lens with internal reflection, the light intensity distribution and stray light distribution were derived. The designed spectacle lenses are meniscus lenses with a refractive power of 0.00 D, refractive index of 1.56, and a radius of 155.15 mm. The peaks of reflectance of the 4 types of blue-light blocking lenses are in the range between 430 nm and 440 nm, and their reflectances are 5%, 10%, 15%, and 20%, respectively. According to the analysis results, as the reflectance of the blue-light blocking lens increases, the light intensity in the center of the lens decreases and the intensity of the stray light in the center-periphery and periphery of the lens increases. This trend appeared to intensify with increasing reflectance of the blue-light blocking lenses. Because the increase in the reflectance of the blue-light blocking lens degrades the quality of the image by increasing the intensity of the stray light in the center-periphery and periphery of the lens, its reflectance needs to be adjusted by varying the blue-light blocking ratio and the luminous transmittance, in order to diminish the level of visual discomfort.
The Moderating Effects of Resilience and Social Support on the Relation between Job-seeking Stress and Depression/Psychological Well-being
Eom, Na Yeon ; Kim, Eunha ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 619~630
DOI : 10.5762/KAIS.2016.17.5.619
As the level of job-seeking stress increases among college students, increasing attention is being paid to the variables that would decrease its negative effects through brief intervention programs or counseling. As such, in the present study, we examined the effects of job-seeking stress on depression and psychological well-being, and whether resilience (internal variable) and social support (external variable) would moderate such effects. In other words, we tested whether the negative effects of job-seeking stress on depression and psychological well-being would be decreased by resilience and social support. A total of 264 fourth-year college students and unemployed 4-year college graduates, who were looking for jobs in private and public enterprises participated in this study. The results indicated that resilience moderated the relation between job-seeking stress and depression, while social support did not. In contrast, resilience did not moderate the relation between job-seeking stress and psychological well-being, whereas social support did. These results suggest that as resilience increases, the effect of job-seeking stress on depression decreases, whereas as social support increases, the effect of job-seeking stress on psychological well-being decreases.
Effect of Tai-Chi on Grip Power, Pain and Fear of Falling in Elderly Person
Oh, Chung-uk ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 631~636
DOI : 10.5762/KAIS.2016.17.5.631
The purpose of this study was to test the effects of Tai Chi exercises on the grip power, pain and fear of falling in elderly persons. A quasi-experimental design was used. This study included 37 subjects who were living in C city. The subjects were divided into the experiment group (n=18) trained in the Tai Chi technique for 6 weeks and the control group (n=19). The experimental group practiced the 24 posture simplified form of Tai Chi for 6 weeks (5 times per day for 60 minutes each time). The effect of the treatment was measured by determining the grip power, pain and fear of falling before and after the 6 weeks of intervention. The experimental group showed a significant increase in grip power (P<0.001) and decrease in pain (P<0.001) compared to the control group. The fear of falling in the experimental group decreased significantly (P<0.002). Tai Chi exercises may be an effective intervention to prevent falling. The Tai Chi technique would therefore be a good method of improving the pain and body health index in elderly persons.
Development of Tunnel-Environment Monitoring System and Its Installation III -Measurement in Solan Tunnel-
Park, Won-Hee ; Cho, Youngmin ; Kwon, Tae-Soon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 637~644
DOI : 10.5762/KAIS.2016.17.5.637
This paper is a follow-up to previous papers entitled, "Development of Tunnel-Environment Monitoring System and Its Installation" I  and II . The target tunnel of these studies is the Solan Tunnel, which is a loop-type, single-track, 16.7-km-long tunnel located in mountainous terrain and passing through the Baekdudaegan mountain range. It is an ordinary railway tunnel designed for both freight and passenger trains. We analyzed the environmental conditions of the tunnel using temperature and humidity data recorded over approximately one year. The data were recorded using the Tunnel Rough Environment Measuring System (TREMS), which measures environmental data in subway and high-speed train tunnels and is installed in three locations inside the tunnel. Previous studies analyzed environmental conditions inside tunnels located in or near a city, whereas the tunnel in this study is located in a mountainous area. The tunnel conditions were compared with those measured outside the tunnel for each month. Hourly changes during summer and winter periods were also analyzed, and the environmental conditions at different locations inside the tunnel were compared. The results are widely applicable in studies on the thermal environment and air quality of tunnels, as well as for computer analysis of tunnel airflow such as tunnel ventilation and fire simulations.
A Comparison Study on Statistical Modeling Methods
Noh, Yoojeong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 645~652
DOI : 10.5762/KAIS.2016.17.5.645
The statistical modeling of input random variables is necessary in reliability analysis, reliability-based design optimization, and statistical validation and calibration of analysis models of mechanical systems. In statistical modeling methods, there are the Akaike Information Criterion (AIC), AIC correction (AICc), Bayesian Information Criterion, Maximum Likelihood Estimation (MLE), and Bayesian method. Those methods basically select the best fitted distribution among candidate models by calculating their likelihood function values from a given data set. The number of data or parameters in some methods are considered to identify the distribution types. On the other hand, the engineers in a real field have difficulties in selecting the statistical modeling method to obtain a statistical model of the experimental data because of a lack of knowledge of those methods. In this study, commonly used statistical modeling methods were compared using statistical simulation tests. Their advantages and disadvantages were then analyzed. In the simulation tests, various types of distribution were assumed as populations and the samples were generated randomly from them with different sample sizes. Real engineering data were used to verify each statistical modeling method.
Antimicrobial resistance rates changes according to the amount of the antimicrobial agent in clinically important strain isolated from blood cultures
Kim, Jae-Jung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 653~659
DOI : 10.5762/KAIS.2016.17.5.653
The purpose of the study is to investigate the correlation between the amount of antimicrobial agent (Defined Daily Dose, DDD) and antimicrobial resistance rate (%). The treatment of infectious diseases is becoming increasingly difficult, due to the increase in the number of multi-drug resistant bacteria, making it a clinically significant problem. Among the various factors, antimicrobial abuse is a major cause of antimicrobial resistance. The study was conducted on inpatients in a secondary university hospital in the central region utilizing the hospital's computerized statistical data and microbiological program of laboratory medicine from January 2010 to December 2014 pertaining to the dose of antimicrobial drugs for Acinetobacter baumannii, Pseudomonas aeruginosa, Klebsiella pneumoniae, and Escherichia coli strains isolated from blood culture. We analyzed the antimicrobial resistance rate per dose with the Pearson correlation coefficient. A significant (positive?) correlation was detected between the cefepime dose and the resistance of E. coli (P<0.033; r=0.907), while a significant negative correlation was found between the tobramycin dose and the resistance of E.coli. (P<0.028; r=-0.917). The aminoglycoside resistance of A. baumannii showed a significant negative correlation (P<0.048; r=-0.881), and the aminoglycoside resistance of E. coli showed a significant negative correlation as well (P<0.001; r=-0.992). In conclusion, the amount of antimicrobial agent (Defined Daily Dose, DDD) (is partly related to) the bacterial strain and its antimicrobial resistance rate (%).
A study on Symptom Experience, Spiritual Well-Being, and Depression in Patients Undergoing Hemodialysis
Song, Ju Yeon ; Oh, Pok-Ja ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 660~670
DOI : 10.5762/KAIS.2016.17.5.660
This cross-sectional descriptive investigation attempted to identify the relationship among the symptoms, spiritual well-being, and depression experienced by patients undergoing hemodialysis. Data were collected from 146 patients at 6 hemodialysis clinics from October 15th, 2014 to January 15th, 2015. The Dialysis Symptom Index (DSI) was used to measure symptom experience, spiritual well-being was measured using the Spiritual Well-being Scale, and depression was assessed using the Center for Epidemiologic Studies Depression Scale (CES-D). The data were analyzed using ANOVA, the t-test, Scheffe's test, Pearson correlation, and hierarchical regression analysis. The mean score of the symptom experience was 26.43 (range: 0~85), the mean spiritual well-being score was 47.79 (range: 20~80), and the mean depression score was 10.56 (range: 0~35). It was found that greater existential well-being leads to lower depression (r=-.23, p=.004) and symptom experience (r=-.17, p=.045). Greater physical (B=.09) and emotional (B=.64) symptom experience leads to higher depression and the explanatory power of these factors was 52.1% (F=18.54, p<.001). Therefore, a comprehensive nursing intervention that can help reduce the symptom experience and increase the existential well-being in hemodialysis patients is needed to reduce their depression.
Basic Study on Bridge Asset Management Framework and LOS for Efficient Downtown Bridge Maintenance
Kim, Gyung-Hyun ; Kim, Dong-Jin ; Lim, Jong-Kwon ; Park, Mi-Yun ; Lee, Min-Jae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 671~679
DOI : 10.5762/KAIS.2016.17.5.671
Bridges, which constitute one of the key facilities in a social infrastructure, are easily accessed and used by users, so that keeping their performance above a certain level is essential. According to various cases in the U.S., Japan and Europe with a long construction history, it is expected that the maintenance cost of bridges in Korea will increase continuously in the future, so a rational decision making system based on engineering factors is necessary to optimize the performance of and maintain them by allocating the limited budget efficiently. This study is a preliminary basic study for the purpose of developing a common asset management system for managing all of the bridges and maintaining the level of service provided by them. The scope of this preliminary study is limited to bridges in urban areas. The bridge asset management system for bridges in urban areas, their level of service (LOS) and performance measure (PM) were developed by carrying out a workshop consisting of both experts and stakeholders. The analysis on the weights of the value and performance measure for each performance indicator was carried out by using the multi-attribute utility theory and the AHP method. In order to confirm the application of the weight of the performance measure and value of the performance indicator, six bridges in an example city were selected, LOS analysis was applied and its results were reviewed.
A Framework for Quality Improvement in Weapon System using Post-Logistics Support Data
Kim, Geun-Hyung ; Kim, Young-Kuk ; Park, Seung Hwan ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 680~687
DOI : 10.5762/KAIS.2016.17.5.680
Although advanced weapon system weapons with high-performance and various functions have been developed, weapon defects can be fatal in the weapons industry. Therefore, the army requires quality improvement to reduce the number of defects which occur during both the development and operation of the weapon system. Recently, many manufacturers, including weapons manufacturers, have conducted analyses using defect related big-data in order to improve the quality. However, there have been few data analyses, because it is difficult to obtain the data required for the analysis of the development phase. Therefore, this study summarizes the pattern of the weapon system, military organization, and defect types using the actual data of the Post-Logistics Support (PLS) phase. The PLS data, which is referred to as the data collected after force integration, includes information on requests for maintenance. Through this information, this study selects key variables and analyzes the selected variables. The analysis results show the critical factors to be considered during the development phase. Finally, this study proposes a framework for advanced PLS systems using the PLS data. The proposed framework enables the development time of weapon systems to be further shortened and their quality to be improved.
Characteristics of the 80MPa High Strength Concrete according to the Hot Weather Outside Temperature conditions
Jung, Yong-Wook ; Lee, Seung-Han ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 688~696
DOI : 10.5762/KAIS.2016.17.5.688
This paper evaluates the effect of hot weather conditions on the fresh concrete characteristics of 80-MPa high-strength concrete. The slump flow, packing ability, setting time, hydration heat, and compressive strength were evaluated under exterior temperatures of
. The slump flow, arrival speed of 500 mm, and their changes with the elapsed time were found to bring the occurrence of rapid slump loss forward by about 30 minutes when increasing the temperature by
. The initial and final setting times of the concrete at
were 7 hours and 12 hours, which were reduced by 1 hour and 3 hours at
and by 2 hours and 5 hours at
, respectively. The hydration heat characteristics at
were similar in terms of the highest temperature of the concrete casting depth and the time when the maximum temperature occurred. However, at
, the maximum temperature occurred about 4 hours earlier, and the highest temperature per the concrete casting depth increased by about
. Therefore, it is concluded that the characteristics can vary according to the exterior temperature. Thus, quality assurance should consider workability, temperature cracks due to hydration heat, the properties of strength development, and other characteristics.
A study on analysis model for real radio spectrum data correlation in High-Mountain Area
Han, In-Sung ; Sohn, Ju-Hang ; Park, Moo-Sung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 697~708
DOI : 10.5762/KAIS.2016.17.5.697
As the needs for fast wireless communication technology in various fields, including companies, individuals, etc., grows, many research projects related to the coverage of propagation are being carried out for plaining optimized communication services. On the other hand, there are some limitations in surveying and analyzing propagation in highland areas. To provide a better communication service of a new service, a range of radio environment conditions based on a wide radio bandwidth (selection of propagation model, correction of value in accordance with radio bandwidth, etc.) should be considered. In particular, radio environment conditions are becoming increasingly sophisticated. By the early detection of real-time changes in the radio spectrum, which is based on an examination and research of regional occupied band width condition, proper measures should be established. To make a proper solution of above, the basic real-time analysis of spectrum distribution status by regional groups is necessary. In addition, the establishment of prompt measures should be enable by stored or analyzed radio data. In an attempt to predict reliable propagation coverage, this thesis examines the limited propagation data with HTZ Warfare, which were collected from domestic high land sites faced with limited access. Furthermore, a comparative result value evaluation for an optimized propagation model was performed through testing simulations, and frequency-dependent and propagation model-dependent analysis.
Experimental Study on Corrosion Characteristics of 1.25Cr-0.5Mo in the 1
-mathanator reactor for Synthetic Natural Gas according to Gas Compositions
Kim, Jin-Hyun ; Cho, Honghyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 709~716
DOI : 10.5762/KAIS.2016.17.5.709
Recently, the operating conditions of the various mechanical structures have become more severe and the running time has become longer as the development of plant equipment increases with the introduction of high technology. Thus, the reliability of the system and its accessories is becoming a problem. Normally, synthetic natural gas (SNG) plants use 1.25Cr-0.5Mo or 2.25Cr-1Mo heat resistant steel according to the operating conditions. In this study, a lab-scale reactor was set up using 1.25Cr-0.5Mo steel, in order to carry out corrosion tests for producing synthetic natural gas. The corrosive characteristics were investigated under 1st-methanator operating conditions and fundamental data about the durability and reliability were obtained by using the experimental test. The analysis of results obtained on the durability of the reactor under emission and injection compositions showed that the hydrogen embrittlement caused by hydrogen and the oxidation corrosion caused by H2O had the most effect on the durability of 1.25Cr-0.5Mo steel in the SNG reactor. However, the hydrogen embrittlement and oxidation corrosion occurred simultaneously under emission conditions, so that the corrosion of the material increased suddenly after a long operating time. Besides, the corrosion of the 1.25Cr-0.5Mo steel under the injection composition was faster than that under the emission composition.
Current Limiting and Recovery Characteristics of Two Magnetically Coupled Type SFCL with Two Coils Connected in Parallel Using Dual Iron Cores
Ko, Seok-Cheol ; Lim, Sung-Hun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 717~722
DOI : 10.5762/KAIS.2016.17.5.717
In this paper, in order to support the peak current limiting function depending on the intensity of the fault current at the early stage of failure, a two magnetically coupled type superconducting fault current limiter (SFCL) is proposed, which includes high-Tc superconducting (HTSC) element 1, where the existing primary and secondary coils are connected to one iron core in parallel, and HTSC element 2, which is connected to the tertiary winding using an additional iron core. The results of the experiments in this study confirmed that the two magnetic coupling type SFCL having coil 1 and coil 2 connected in parallel using dual iron cores is capable of having only HTSC element 1 support the burden of the peak current when a failure occurs. The reason for this is that although HTSC element 1 was quenched and malfunctioned because the instantaneous factor of the initial fault current was large, the current flowing to coil 3 did not exceed the critical current, which would otherwise cause HTSC element 2 to be quenched and not function. In order to limit the peak current upon fault through the sequential HTSC elements, the design should allow it to have the same value as the low value of coil 1 while having coil 3 possess a higher self-inductance value than coil 2. In addition, a short-circuit simulation experiment was conducted to examine and validate the current limiting and recovery characteristics of the SFCL when the winding ratio between coil 1 and coil 2 was 0.25. Through the analysis of the short-circuit tests, the current limiting and recovery characteristics in the case of the additive polarity winding was confirmed to be superior to that of the subtractive polarity winding.
A study on the Optimal Configuration Algorithm for Modeling and Improving the Performance of PV module
Jeong, Jong-Yun ; Choi, Sung-Sik ; Choi, Hong-Yeol ; Ryu, Sang-Won ; Lee, In-Cheol ; Rho, Dae-Seok ;
Journal of the Korea Academia-Industrial cooperation Society, volume 17, issue 5, 2016, Pages 723~730
DOI : 10.5762/KAIS.2016.17.5.723
Solar cells in a PV module are connected in series and parallel to produce a higher voltage and current. The PV module has performance characteristics depending on solar radiation and temperature. In addition, the PV system causes power loss by special situations, including the shadows of the surrounding environment, such as nearby buildings and trees. In other words, an increase in power loss and a decrease in life cycle can occur because of the partial shadow and hot-spot effect. Therefore, this paper proposes the optimal configuration algorithm of a bypass diode to improve the output of a PV module and one of a PV array to minimize the loss of the PV array. In addition, this paper presents a model of a PV module and PV array based on the PSIM S/W. The simulation results confirmed that the proposed optimal configuration algorithms are useful tools for improving the performance of PV system.