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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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Journal DOI :
The Korea Academia-Industrial cooperation Society
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Volume & Issues
Volume 15, Issue 12 - Dec 2014
Volume 15, Issue 11 - Nov 2014
Volume 15, Issue 10 - Oct 2014
Volume 15, Issue 9 - Sep 2014
Volume 15, Issue 8 - Aug 2014
Volume 15, Issue 7 - Jul 2014
Volume 15, Issue 6 - Jun 2014
Volume 15, Issue 5 - May 2014
Volume 15, Issue 4 - Apr 2014
Volume 15, Issue 3 - Mar 2014
Volume 15, Issue 2 - Feb 2014
Volume 15, Issue 1 - Jan 2014
Selecting the target year
Development of Non-Scallop Block Joint Welding Method
Kim, Ho-Kyeong ; Ko, Dae-Eun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5419~5424
DOI : 10.5762/KAIS.2014.15.9.5419
A weld scallop is a small quadrant or half circle type hole installed in the weld line cross area for easy welding operation. Many types of T-bars with a scallop can be welded in a block assembly stage in shipbuilding. The difficulties arise from the fact that scallops are to be filled by build-up welding after welding of the cross line is complete. In this study, a non-scallop block joint welding method was developed using special type CBM (ceramic backing material). The wedge shaped CBM was devised to insert a CBM into just the V groove of weld line cross area without weld scallop. A saw-toothed shape was adopted for easy cutting of the unnecessary part in the CBM fitting process. The applicability of the developed method was verified through welding experiments based on the yard welding conditions.
Theoretical Analysis on the Factors Affecting the Power Efficiency of the Kalina Cycle
Lee, Ki-Woo ; Chun, Won-Pyo ; Shin, Hyeon-Seung ; Park, Byung-Duck ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5425~5433
DOI : 10.5762/KAIS.2014.15.9.5425
This study examined the effects of the key parameters on the power efficiency of the waste heat power plant using the EES program to obtain data for the design of the 20kW Kalina power plant. The parameters include the ammonia mass fraction, vapor pressure, heat source temperature, and the cooling water temperature. According to the analyses, a lower ammonia mass fraction and a higher vapor pressure increase the efficiency, in general. On the other hand, this study shows that there is a specific region with a very low ammonia mass fraction, where the efficiency decreases with ammonia mass fraction. Regarding the vapor pressure at the turbine inlet, the power efficiency increases with increasing vapor pressure. In addition, it was found that the influence of the vapor pressure on the efficiency increases with increasing ammonia mass fraction. Finally, the optimal condition for the maximum power efficiency is defined in this study, i.e., the maximum efficiency was 15% with a 25bar vapor pressure,
heat source temperature,
cooling water temperature, and 0.4 ammonia mass fraction.
Development of a Precision Management System for Quality Control of Progressive die
Park, Jong-Nam ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5434~5439
DOI : 10.5762/KAIS.2014.15.9.5434
The surface management of metals was performed with a tool microscope or surface roughness measurement instruments. These methods were not efficient for checking the surface status of the die in the production field. For this reason, an analysis system or measurement system to monitor the wear, defects and surface status as a die ages is required. This study, developed surface analysis software for automatic analysis and standardization of a die or processed products. Software was designed to measure the basic features, such as circles, dots, and lines. The captured images were rendered as three-dimensional representations so that the depth of the grooves on the die and segmental profiles could be estimated. As a result of experimental analysis, the surface roughness was measured with an accuracy more than 93.2%, and the maximum deviation in the surface roughness for the brightness of the lighting was within
. The confidence in the device's precision was assured. These results show quality control through efficient surface analysis.
Sensor-based Recognition of Human's Hand Motion for Control of a Robotic Hand
Hwang, Myun Joong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5440~5445
DOI : 10.5762/KAIS.2014.15.9.5440
Many studies have examined robot control using human bio signals but complicated signal processing and expensive hardware are necessary. This study proposes a method to recognize a human's hand motion using a low-cost EMG sensor and Flex sensor. The method to classify movement of the hand and finger is determined from the change in output voltage measured through MCU. The analog reference voltage is determined to be 3.3V to increase the resolution of movement identification through experiment. The robotic hand is designed to realize the identified movement. The hand has four fingers and a wrist that are controlled using pneumatic cylinders and a DC servo motor, respectively. The results show that the proposed simple method can realize human hand motion in a remote environment using the fabricated robotic hand.
Study of Traffic Sign Auto-Recognition
Kwon, Mann-Jun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5446~5451
DOI : 10.5762/KAIS.2014.15.9.5446
Because there are some mistakes by hand in processing electronic maps using a navigation terminal, this paper proposes an automatic offline recognition for traffic signs, which are considered ingredient navigation information. Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA), which have been used widely in the field of 2D face recognition as computer vision and pattern recognition applications, was used to recognize traffic signs. First, using PCA, a high-dimensional 2D image data was projected to a low-dimensional feature vector. The LDA maximized the between scatter matrix and minimized the within scatter matrix using the low-dimensional feature vector obtained from PCA. The extracted traffic signs under a real-world road environment were recognized successfully with a 92.3% recognition rate using the 40 feature vectors created by the proposed algorithm.
Multi Degree of Freedom Linear Electric Generator for Structural Concerns and Electric Generation Improvement of the Linear Electric Generator in a Vehicle Suspension
Choi, Ji-Hyun ; Kim, Jin Ho ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5452~5459
DOI : 10.5762/KAIS.2014.15.9.5452
A resonance linear electric generator in a vehicle suspension is a system that performs self-electric generation by collecting the vibration energy when a vehicle runs on a road, and takes the resonance phenomenon to derive large electric generation from slight road surface vibrations. In this paper, the motions of an armature in three different electric generator structures were simulated and the actual generation quantity was calculated and compared with these results. Furthermore, when the vehicle runs on the road, the design improvement for a multi-degree of freedom electric generator was conducted to make the resonance respond to various excitation frequencies, and the change in the resonance points and generation quantity were identified.
A study on the hard surfacing Characteristics of STS420J2 by using Diode laser
Lee, Tae-Yang ; Lim, Byung-Chul ; Park, Sang-Heup ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5460~5466
DOI : 10.5762/KAIS.2014.15.9.5460
In this study, mainly for kitchen knives and small swords, cutlery, etc. STS420J2 used material used for the experiments. In order to cure the surface of the test piece after the rough grinding and fine grinding was performed in order polishing. Perform the surface hardening of STS420J2 local area by using a diode laser. The output of the laser diode and the feed rate to the process variable. Micro-hardness testing, microstructure testing, scanning electron microscope testing(SEM), the heat input to the analysis. After analyzing the experiment to compare the mechanical properties of the material. When using a diode laser to assess the soundness of the surface hardening. Accordingly, the process for deriving the optimum demonstrate the feasibility.
Thermal Analysis of the Heat Sink Performance using FEM
Lee, Bong-Gu ; Lee, Min ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5467~5473
DOI : 10.5762/KAIS.2014.15.9.5467
This study examined the numerical analysis results with respect to the thermal behavior of a natural convection cooled pin-fin heat sink. The heat sink consisted of pin fins integrated with plate fins. The heat sinks were designed with two different types to fit the limited internal space. The two types of heat sinks designed were analyzed using the ANSYS software package, and the numerical analysis results were compared with the cooling performance of the two types of heat sinks. The results of the simulation were analyzed according to the temperature distribution and air flow characteristics, heat flux etc. This study examined the correlation of the cooling performance with the heat sink internal structure and fin shape. FEM (Finite Element Method) confirmed the cooling performance of heat sink type A under natural convection conditions as the best results. The results of the numerical simulation showed that the heat sink type A shape showed an approximately 70 percent better heat transfer rate with natural convection than that of type B.
Quality Evaluations of Induction Motors Bracket Castings during Fabrication Processes
Park, Sang-Chul ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5474~5479
DOI : 10.5762/KAIS.2014.15.9.5474
This study evaluated the residual stress and deformation for bracket castings of induction motors. Numerical analyses were performed to evaluate the residual stress distributions and displacements of bracket castings after the casting and final machining processes. Based on the analysis results, it was found that bracket casting was satisfied with the internal quality standards during the fabricating processes.
MDPS Analysis Software Development
Jang, Bongchoon ; Kim, Joung-Hoon ; Yang, Sung-Mo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5480~5486
DOI : 10.5762/KAIS.2014.15.9.5480
Complete novel software for MDPS for the simulation and analysis is proposed for steering engineers. The software, MSAS, which can provide the functionality for MDPS Simulation, Analysis & Synthesis, is based on the steering system model, vehicle model and control logic. As the suppliers provide the control logic as a black box, this software is capable of using any type of black box logic or white box control logic that can be developed by logic designers. In addition, this software will be synthesized with the suppliers' s-function control logic and RMDPS together.
Study of the Relationship between Labor time and Wage in Korea
Jang, Yu-Mi ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5487~5494
DOI : 10.5762/KAIS.2014.15.9.5487
This study examined the relationship between income and the value of leisure to develop a more accurate model of the labor market without necessarily losing the primary merit of the received model. Moreover, with an improved understanding of the labor market dynamics, it can be seen that progressive era labor market legislation, which was designed to mitigate the effects of the bargaining power inequality in low wage labor markets, was in fact based on sensible economic foundations. These low-wage dynamics present an example of a positive feedback system or "vicious circle" at work in the economy. The market dynamics of the low wage sector push the wage away from the range that is consistent with a self-regulating market.
Study on the speech act comprehension characteristics and the correlation between the speech act comprehension characteristics and executive function in Individuals with a Left Frontal Brain Injury
Kim, Ji-Chae ; Lee, Eun-Kyoung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5495~5501
DOI : 10.5762/KAIS.2014.15.9.5495
Individuals with a left frontal brain injury show significant impairments in their speech ability. The aims of the present study were (1) to assess and compare the ability of speech acts comprehension and executive function between individuals with a left frontal brain injury and normal individuals, and (2) to investigate the correlation of speech act comprehension ability factors. The study's subjects were 18 individuals with a left frontal brain injury and 18 normal control adults of the same age, gender, and educational age. The following results were obtained. First, the group of individuals with a left frontal brain injury had lower speech act comprehension, executive function than the normal control group. Second, the speech act comprehension ability of the individuals with a left frontal brain injury showed a high correlation with the executive function.
Lean Maintenance Framework, Maintenance Strategy for ILS and Case Study on Lean PM
Lim, Jae-Hoon ; Seo, Yang-Woo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5502~5512
DOI : 10.5762/KAIS.2014.15.9.5502
Until recently, Integrated Logistics Support (ILS) focused mainly on the development and acquisition of supportability factors (maintenance planning, maintenance tools, support equipment, supply support, maintenance training, etc.). In the long term, supportability strategies and policies are needed in terms of LEAN-like cost reduction, efficiency in the field of weapon systems. This study first introduces the concept of Lean, theory of Lean Maintenance and suggests Lean maintenance framework, maintenance strategy for ILS. The case studies were analyzed in terms of the maintenance time, maintenance man-hours, maintenance cost for Lean PM in a radar system. The direction of LEAN on supportability in a weapon system is suggested.
Comparative Study on the Satisfaction Factors of 2009 and 2013 Cheonan Well-being Food Expos
Yang, Jong-Gon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5513~5524
DOI : 10.5762/KAIS.2014.15.9.5513
This study empirically compared the Cheonan 2009 Well-being Food Expo with the Cheonan 2013 International Well-being Food Expo in terms of the Expo's content, predictors of satisfaction, and predictors themselves. According to the analysis results, the satisfaction levels of the Expo's contents, Expo's environment, convenient facilities' operations, general satisfaction, and visitor's revisiting intention of the Cheonan 2013 International Well-being Food Expo, were higher than those of the Cheonan 2009 Well-being Food Expo. In addition, all factors of satisfaction except for the convenient facilities' operations are predictors of the visitor's general satisfaction at both expos and the general satisfaction of both expos is a significant factor for visitor's revisiting intention.
Study of the Influence of the Depressive mood of the Elderly : Focused on the mediating effect of Communication between families and self-esteem
Jung, Shin-Sub ; Ha, Kyu-Soo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5525~5533
DOI : 10.5762/KAIS.2014.15.9.5525
This study examined the influence of communication between families and self-esteem on the depression mood of the elderly, and provides basic data for a depression care program. For those purposes, a questionnaire was developed based on the literature regarding the depression mood. To achieve the research aim, the surveys were conducted in Seoul, Gyenggi-do for 420 elderly people from April to May 2014. The results of the hypothesis testing were as follows. The degree of depression was increased significantly in the elderly with economic factors, factor in family relationships, health factors, and social factors. According to hierarchical regression analysis, a significant mediating effect was found with communication between families and self-esteem on the depression mood of the elderly. Therefore, the characteristics of the elderly individual communication between families and the increase in self-esteem, which can be specifically institutional, social and administrative unit and financial support should be considered.
Factor Analysis of the Defense Industry Environment affecting Defense Industry Company's Business Performance
Lee, Janghyong ; Kim, Dong-Hwi ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5534~5542
DOI : 10.5762/KAIS.2014.15.9.5534
The defense industry plays a larger role than merely maintaining national security; it also has ripple effects in society, such as employment growth through increased domestic demand and advancement of industrial structures. In this study, the factors affecting the defense industry were divided into military support and government support. Previous research dealing with the correlation of management of the defense industry and each of these important factors was then investigated and analyzed. These results are believed to contribute to growth of the defense industry through building an environment that positively affects the defense industry's growth, profitability and productivity, and achieves higher business performance.
Effectiveness of Learning Flow and Academic Achievement on Learning Activities with Real-Time Feedback utilizing a Smart Clicker App in Higher Education
Bae, Ji-Hye ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5543~5552
DOI : 10.5762/KAIS.2014.15.9.5543
The advancement of smart-phones and their market expansion has led to the development of numerous educational applications (apps). In this study, learning activities were designed for real-time feedback utilizing a smart clicker app for effective communication between the instructors and students, and to provide educational results, such as learning flow and academic achievement. These strategies were applied in the actual educational fields, and 70 college students were taking classes with the same curriculum. Experiments involving an experimental group and control group were conducted. The results of the t-test were follows. In terms of learning flow, a significant difference was observed between the two groups, but not in terms of academic achievement.
Effects of Role Performance of Kindergarten Teachers on Teaching Efficacy and Job Stress
Na, Kim-An ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5553~5563
DOI : 10.5762/KAIS.2014.15.9.5553
The purpose of this study was to understand the structural relationships of the kindergarten teachers' role performance with the teaching efficacy and job stress. To achieve the research goal, this study conducted a survey targeting a total of 300 teachers, vice principals and principals working for infant educational institutes located in Gyeonggi-do, and analyzed 253 copies of the survey in total. The study used a structural equation to design a structural equation-based model to look into the structural relationships related to the role performance with the teaching efficacy and job stress. The collected data was then analyzed by AMOS 18.0 to estimate the correspondence and the parameter of the model. According to the results of the analysis, the role performance of kindergarten teachers was observed to have an immediate influence on the teaching efficacy. The role performance of kindergarten teachers was directly connected to job stress. The job stress had an indirect relationship with the role performance of kindergarten teachers through the teaching efficacy. The teaching efficacy of the kindergarten teachers was confirmed to have immediate association with the job stress of infant teachers.
An Analysis of Consumer Expenditure Patterns according to Household Characteristics
Park, Moonsoo ; Chong, Hogun ; Koh, Daeyoung ; Lee, Kyung-Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5564~5577
DOI : 10.5762/KAIS.2014.15.9.5564
This study examined how the differences in household characteristics influence consumer expenditure patterns. The Price-Scaling AIDS model with household income and expenditure survey data were used for the analysis. The results showed that the income elasticity of the service items is greater than non-service items, indicating an increase in higher demand of service items with the same increase in household income. The household expenditure patterns vary according to the commodities, holding age and income level. The so-called traditional pattern, which emphasizes spending for non-service items, changed to the one with a higher expenditure ratio for service items. Such a change in household expenditure patterns naturally derives the expansion of the relevant service market; hence, the growth of the related service industry. This highlights the need to formulate an appropriate response from the supply side that deals with the changes in the service market.
Effects of Self-motivated Virtual Reality Exercise Program on Heart Rate Variability and Quality of Life in the Hemodialysis Patients
Cho, Hye-Young ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5578~5584
DOI : 10.5762/KAIS.2014.15.9.5578
In this study, 46 patients from a local hemodialysis center were enrolled to assess the effects of a self-motivated virtual reality (VR) exercise program on the heart rate variability and quality of life control in hemodialysis patients. The VR group (n = 23) completed a VR exercise program, where the subjects performed the exercise 40 min per session, 3 sessions per week, for 8weeks. After the exercise program, the heart rate variability and quality of life were measured. The VR group showed significant improvement in the heart rate variability and quality of life. The self-motivated VR exercise program provided both the role of supervisor as well as feedback, which is important for hemodialysis patients.Therefore, a self-motivated VR exercise program may be a useful tool for improving the psychosocial function in chronic disease patients undergoing hemodialysis.
Impact of Heterogeneous Dispersion Parameter on the Expected Crash Frequency
Shin, Kangwon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5585~5593
DOI : 10.5762/KAIS.2014.15.9.5585
This study tested the hypothesis that the significance of the heterogeneous dispersion parameter in safety performance function (SPF) used to estimate the expected crashes is affected by the endogenous heterogeneous prior distributions, and analyzed the impacts of the mis-specified dispersion parameter on the evaluation results for traffic safety countermeasures. In particular, this study simulated the Poisson means based on the heterogeneous dispersion parameters and estimated the SPFs using both the negative binomial (NB) model and the heterogeneous negative binomial (HNB) model for analyzing the impacts of the model mis-specification on the mean and dispersion functions in SPF. In addition, this study analyzed the characteristics of errors in the crash reduction factors (CRFs) obtained when the two models are used to estimate the posterior means and variances, which are essentially estimated through the estimated hyper-parameters in the heterogeneous prior distributions. The simulation study results showed that a mis-estimation on the heterogeneous dispersion parameters through the NB model does not affect the coefficient of the mean functions, but the variances of the prior distribution are seriously mis-estimated when the NB model is used to develop SPFs without considering the heterogeneity in dispersion. Consequently, when the NB model is used erroneously to estimate the prior distributions with heterogeneous dispersion parameters, the mis-estimated posterior mean can produce large errors in CRFs up to 120%.
Role of Samultang in Formalin-induced Orofacial pain
Kim, Yun-Kyung ; Hyun, Kyung-Yae ; Park, Min-Kyoung ; Lee, Min-Kyung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5594~5601
DOI : 10.5762/KAIS.2014.15.9.5594
The aim of this study was to evaluate the analgesic effects of Samultang by measuring the anti-inflammatory and antioxidative activities in formalin-induced orofacial pain. The anti-inflammatory and anti-oxidative effects were measured by western blot analysis for p38 MAPK(Mitogen-activated protein kinases), iNOS(induceble nitric oxide synthase) and NOX4(nicotinamide adenine dinucleotide phosphate4) in a rat's brain and medulla oblongata. Samultang significantly attenuated the increased formalin-induced nociceptive response and inhibited the p38 MAPK and iNOS that led to inflammatory pain. In addition, this study indicated that Samultang possess antioxidative effects through the blockade of NOX4. These findings suggest that Samultang plays an important role in the peripheral processing of inflammatory pain in the orofacial area.
Remineralization effect of casein phosphopeptide-amorphous calcium fluoride phosphate on the tooth enamel according to the etching time and frequency of application
Jung, Su-Jin ; Lee, Mi-Ra ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5602~5609
DOI : 10.5762/KAIS.2014.15.9.5602
This study examined the remineralization effect of CPP-ACFP according to the etching time and the frequency of application. A CPP-ACFP paste was formed from a combination of CPP-ACP paste and fluorine. The remineralization effect of CPP-ACFP was measured according to the etching time and the frequency of applications of CPP-ACFP. The microhardness of 64 teeth was measured as the sound sample and observed by scanning electron microscopy. As a result, the effect on remineralization of the enamel increased with increasing etching time and frequency of application. Therefore, a CPP-ACP paste combination to fluorine in the tooth mineral CPP-ACFP paste fluoride application can be supplied with the material-advisable enamel remineralization.
Relationship Between the Psychosocial Factors and Job Stress Among Clerical Public Officers
Park, Ho-Jin ; Park, Sung-Kyeong ; Cho, Young-Chae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5610~5620
DOI : 10.5762/KAIS.2014.15.9.5610
This study was conducted to determine the levels of job stress, as well as its association with psychosocial factors (type A behavior pattern, locus of control, and self-esteem). Self-administered questionnaires were given to 634 clerical public officers in the C Provincial Office between February 18 and Mar. 10, 2013. As a result, the job stress levels of the subjects was significantly different according to age, sex, educational level, marital status, job position, job career, satisfaction in job life, smoking, alcohol drinking, sleeping time, type A behavior pattern, locus of control, and self-esteem. Regarding the correlation of job stress and psychosocial factors, the level of job demand was negatively correlated with the internal locus of control. The decision latitude was negatively correlated with the type A behavior pattern, internal locus of control and self-esteem. Supervisor support was negatively correlated with the external locus of control. In hierarchial multiple regression analysis, the affecting factors to the job stress selected variables, such as age, subjective health status, job position, overtime work, experience of sick absence, satisfaction in work, sleeping time, leisure time, visiting out-patient department, type A behavior pattern, locus of control, and self-esteem, and the explanatory powers of these factors was 32.1%. In particular, the factors related to the psychosocial factors (type A behavior pattern, locus of control, self-esteem) were strongly related to the job stress, increasing the explanation of factors up to 15.0%.
Determination Factors Affecting the High Order Aberrations in Preoperative and Postoperative LASEK
Kim, Tae-Heung ; Lee, Hyun ; Rhee, Kang-Oh ; Lee, Tae-Yong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5621~5627
DOI : 10.5762/KAIS.2014.15.9.5621
To specify the standard of LASEK surgery, this study examined the determination factors affecting the high order aberrations (HOAs) in preoperative and postoperative LASEK. 51 adult patients (102 eyes) were evaluated at the baseline and 2 months after LASEK surgery from Nov 2011 to Jul 2012. The postoperative HOAs (
) were higher than the preoperative (
). In linear regression analysis, the refractive components that affected the postoperative HOAs were
of corneal astigmatism (CA, 0.400),
of refractive astigmatism (RA, 0.389), corneal astigmatism (CA, 0.282), spherical equivalent (SE, 0.239), refractive astigmatism (RA, 0.213), and pupil size (PS, 0.194) with a high R. In multiple regression,
of CA, PS and SE were significant factors with the postoperative HOAs. In conclusion, both HOAs and
of CA should be considered when determining the suitable factors for LASEK surgery.
Effect of Artemisia annua Linne callus induced by plant cell culture technology on wound healing
Oh, Seung Taek ; Jung, Hae Soo ; Cho, Moon Jin ; Song, Mi Young ; Moh, Sang Hyun ; Seo, Hyo Hyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5628~5636
DOI : 10.5762/KAIS.2014.15.9.5628
Currently, many countries have an interest in developing cosmetics materials using native plants. In this aspect, there is increasing need to develop cosmetics materials using native plants in our county. In the present study, calluses were induced from Artemisia annua Linne, which was highlighted because of its useful effects, such as anti-cancer, anti-fungal and anti-inflammation. Water and ethanol extractions were performed from the calluses of Artemisia annua Linne. After the mass production of Artemisia annua Linne's calluses, water and ethanol extraction was performed to examine its functional roles in healing wounds and inflammation. The differences in the effective elements were observed in the ethanol extract. The callus showed anti-inflammation activity through the suppression of the inflammation-related gene, COX-2, and ethanol extracts showed their ability to heal wounds. Overall, these results suggest that the extract of Artemisia annua Linne's calluses is a natural and environment-friendly material, and can be used as medical supplies associated with anti-inflammation and healing wounds.
Factors of the Quality of Life on the Life Satisfaction of Elderly People Living in Abandoned Mine Regions
Lee, Jae-Cheol ; Roh, Hyo-Lyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5637~5643
DOI : 10.5762/KAIS.2014.15.9.5637
This study examined the degree of life satisfaction and quality of life of elderly people living in abandoned mine regions as well as the life quality factors that affected their degree of life satisfaction. A structured survey was used to look at their degree of life satisfaction and quality of life. The subjects were 167 elderly people aged 60 or older residing in abandoned mine regions in Gangwon-do. Their quality of life and degree of life satisfaction was moderate and when they had worked for a mine for a long time, their current degree of life satisfaction was high. In addition, religion affected their degree of life satisfaction and the residential environment and pleasant environment were highly influential in their degree of life satisfaction. Therefore, to improve the degree of life satisfaction of elderly people living in abandoned mine regions, it is essential to recover their hollow areas and create a pleasant environment by organizing their residential areas and enhancing their environment.
Antimicrobial Activities of Propolis against Oral Candidiasis by Candida Albicans -Effect of Microbial Inhibition Using Propolis-
Kwun, Hyeon-Sook ; Nam, Seoul-Hee ; Park, Min-Kyoung ; Cho, Mi SooK ; Cheon, Sae-Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5644~5651
DOI : 10.5762/KAIS.2014.15.9.5644
Propolis is an extremely safe natural antimicrobial substance that has been reported to have powerful antibacterial efficacy. The aim of this study was to evaluate the inhibitory effects of propolis against Candida albicans (C. albicans). Propolis was collected from the honey bee Apis mellifera. The strain of C. albicans was cultivated overnight in liquid media incubated at
. The antimicrobial activity was investigated using phosphate buffered saline (PBS), 3% sodium hypochlorite (NaOCl), 0.1% chorhexidine (CHX), and propolis extracts (
). C. albicans were sensitive to 3% NaOCl, 0.1% CHX, and propolis (
) with zones of inhibition of 15, 14.5, 16, and 17 mm, respectively. The CFU of PBS, 3% NaOCl, 0.1% CHX,
of propolis led a 1, 7, 7, 5 and 7-log reduction. Among the groups tested, C. albicans was most sensitive to
of propolis, which showed the largest inhibition zones. Therefore, propolis can be a new antimicrobial therapy for oral mucosa disease in traditional medicine.
Performance Evaluation of Multi-Module Software System with Imperfect Debugging and Module Dependency
Kim, U-Jung ; Lee, Chong Hyung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5652~5659
DOI : 10.5762/KAIS.2014.15.9.5652
The purpose of this study was to introduce a software task processing evaluation model that considers the following situations: i) a software system is integratedly composed of several number of modules, ii) each modules has its corresponding module task, iii) all module tasks are tested simultaneously, and iv) the processing times of the module tasks are mutually dependent. The software task completion probability with the module dependency was derived using the joint distribution function of Farlie . The results showed that the task completion probability of software increases with increasing module dependency parameter.
Association of Metabolic syndrome, Metabolic syndrome score and Pulse pressure in Korean Adults: Korea National Health and Nutrition Survey, 2012
Park, Sun-Young ; Yoon, Hyun ; Oh, Hye-Jong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5660~5667
DOI : 10.5762/KAIS.2014.15.9.5660
The aim of this study was to assess the association of metabolic syndrome, metabolic syndrome score (MSS) and pulse pressure (PP) in Korean adults. The study subjects were Korean adults 20 years or older (n=5,889) who participated in the Korea National Health and Nutrition Examination Survey 2012. After adjusting for factors, such as year and gender and BMI, the mean PP increased with increasing MSS (MSS 0,
and MSS 1,
and MSS 2,
and MSS, 3,
and MSS 4,
and MSS 5,
), and the mean PP for metabolic syndrome(
) increased in comparison to Non-Metabolic syndrome (
). When logistic regression analysis was performed, the odds ratio (OR) of Hyper-PP (61> PP) for MSS 0 was 4.49 in MSS 1 (95% confidence interval[CI], 2.68-7.57) and 8.01 in MSS 2 (95% CI, 4.77-13.47) and 11.37 in MSS 3 (95% CI, 6.67-19.35) and 19.69 in MSS 4 (95% CI, 11.20-34.60) and 34.07 in MSS 5 (95% CI, 17.44-66.52), metabolic syndrome was associated with an increased Hyper-PP(OR 4.6, 95% CI, 2.0-10.4). Conclusion. These results suggest that an increase in MSS or metabolic syndrome might increase the pulse pressure.
Oral Health Knowledge and Awareness of the Prevention Effects against Dental Caries among Childcare Teachers
Yoon, Hyun-Seo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5668~5674
DOI : 10.5762/KAIS.2014.15.9.5668
This study examined the oral health knowledge of childcare teachers and their awareness of the prevention effects against dental caries. The subjects in this study were 433 childcare teachers in Seoul, Gyeonggi Province, Busan and South Gyeongsang Province, on whom a survey was conducted for five months, beginning in March, 2013. Hospitals (56.6%) were the most common route by which the childcare teachers acquired oral health knowledge. Regarding the distribution of the correct answers on oral health knowledge, every teacher gave the correct answer to the item "When a tooth comes out, it should be kept in milk and then be brought to a dental clinic," and the smallest number of them (35.1%) gave the correct answer to the item "When a tooth comes out, it should be washed with water." Concerning the level of oral health knowledge, the respondents, who worked in Busan and South Gyeongsang Province (p<0.001), who worked in childcare centers with more children (p<0.001), who were younger (p<0.001), and who were junior college graduates (p=0.002) had better oral health knowledge. In regard to the awareness of the prevention effects against dental caries, the respondents who were older (p<0.001) and who were married (p=0.002) were more aware of the prevention effects. According to position and career, teachers who were assistant principals (p=0.023) and had worked for 10 years or more (p=0.009) were more aware of the effects. Therefore, child care teachers should acquire accurate knowledge to improve the oral health of children, and regular training programs for age and education are needed.
Study on Detection of Oral Bacteria in the Saliva and Risk Factors of Adults
Hong, Min-Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5675~5682
DOI : 10.5762/KAIS.2014.15.9.5675
As oral diseases are developed by mixed infections, not by any single element, an accurate analysis of the causative microorganisms related to dental caries and periodontal diseases is required. In this study, saliva was collected from selected adults to determine if the bacteria that are well known as the causative microorganisms of dental caries and periodontal diseases would be detected in their saliva. In addition, this study examined whether there would be any differences among adults according to age, smoking, drinking and presence or absence of diseases in the distribution of oral bacteria to determine the risk factors for oral bacteria. The study subjects were 120 adults ranging in age from 20 to 65 years. The experiment data was collected from March 15, to May 2014. The gDNA was collected from the saliva, and the distribution of bacteria for oral diseases was investigated by PCR. The findings of the study were as follows. S. mutans was detected from 72 adults, and P. intermedia was detected from 88 adults. Both bacteria were detected from 54 adults, and no oral bacteria was detected in 14 adults. An analysis of the risk factors of oral bacteria showed that smokers had a 2.8-fold higher risk of S. mutans than nonsmokers, and the former had a 3.5-fold higher risk of P. intermedia than the latter. Drinkers had a 3.3-fold higher risk of S. mutans than nondrinkers. Patients who suffered from systemic diseases had a 4.1-fold higher risk of P. intermedia than those with no diseases. Therefore, smoking, drinking and systemic diseases are factors that increase the likelihood of oral bacteria detection. More periodontal disease bacteria were detected from older adults, and more oral bacteria were found in adults who were in their 20s, as dental caries and periodontal diseases were more common in this age group. The adults in which oral bacteria were detected are more likely to have dental caries or periodontal diseases, and they should try to keep their mouth cavity clean and make regular visits to a dental clinic to prevent possible oral diseases.
Study of the health promotion behaviors of immigrant women by marriage and the relationship between their Korean language ability and health status
Lee, Kyoung-Soon ; Jeon, Mi-Yang ; Kang, Mal-Soon ; Chae, Kyung-Suk ; Hwang, Jung-Hee ; Yoo, Mi-Young ; Jeong, Hyeon-Cheol ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5683~5692
DOI : 10.5762/KAIS.2014.15.9.5683
This study examined the correlation among the Korean language ability, health promotion behaviors and health status of immigrant women by marriage. Data on the subjects of 148 immigrant women were collected from September to December, 2013. Constructed self-administered questionnaires were used to gather information on the general characteristics of the immigrant women, their Korean language ability, health promotion behaviors and emotional health status. The health examination results of the subjects were used for information on their health status. There were significant differences in the Korean language reading ability, drinking habits, total cholesterol and body mass index between the diseased group and the intact group. An analysis of the relationship between the Korean language ability and health conditions revealed a significant positive correlation between the total cholesterol and neutral fat, but negative correlations between the density of hemoglobin and the total cholesterol, the neutral fat and body mass index. There was a significant negative correlation between the Korean language ability and the level of stress. Based on these results, a program was suggested and developed to decrease the rate of drinking, cholesterol and body mass index of immigrant women and to promote their ability to understand health information and express their diseases properly in the Korean language.
Development of the sourdough Manju production with cake flour and mixed probiotics
Chae, Dong-Jin ; Jang, Ki-Hyo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5693~5699
DOI : 10.5762/KAIS.2014.15.9.5693
The influence of the flour types, including bread flour and cake flour on sourdough preparation was investigated. As starters, mixed probiotic microorganisms, including Bifidobacterium longum KCTC 5734, Enterococcus faecium KCTC 13410, and Lactobacillus acidophilus KCTC 3925, or Saccharomyces cerevisiae fermented separately for 15h at
, were combined and then fermented for 10h at
. The combined process with cake flour showed a 100-fold and two-fold increase in [
] and titratable acidity, respectively. This was also reflected in the viable cell counts and lactate concentration in sourdough. These results show that bread flour and cake flour may be useful for the production of sourdough.
Influential Factors on Fatigue in Patients with Type 2 Diabetes Mellitus
Seo, Yeong-Mi ; Choi, Won-Hee ; Hahm, Jong-Ryeal ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5700~5707
DOI : 10.5762/KAIS.2014.15.9.5700
This descriptive study was performed to identify the factors that influence fatigue in patients with type 2 diabetes mellitus. A total of 117 subjects were recruited from a university hospital in J city. For data collection, a questionnaire survey was performed between May 1 and June 28 2013. Data were analyzed by descriptive statistics, t-test, one way ANOVA, Pearson Correlation, and multiple regression analysis using the SPSS WIN 15.0 package. The mean fatigue scores of the subjects was 2.80. Depression, age, and time since the diagnosis were the variables influencing fatigue. The total explanatory power of these factors on fatigue was 40%. In conclusion, it is essential to develop a fatigue control nursing program considering depression, age and time since the diagnosis for patients with type 2 Diabetes mellitus.
Anti-inflammatory Effects of Korean red ginseng Extract in formalin-induced Orofacial Pain in Rats
Jin, Byung-Moon ; Lee, Min-Kyung ; Lee, Jun-Seon ; Hyun, Kyung-Yae ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5708~5715
DOI : 10.5762/KAIS.2014.15.9.5708
The effects of korean red ginseng (KRG) extracts on orifacial pain control in terms of the systemic inflammatory response and pharmacological effects as health supplements were investigated. The experimental group were divided into three groups, the control group (n=6), formalin (5%,
) injection group (n=6), and formalin (5%,
) injection added KRG administrated group (4.5 ml/kg, n=6). The KRG administrated group prior to the formalin injection significantly attenuated the behavioral response compared to that of the control group. Pain reduction was suppressed mainly from 15 min to 30 min. The KRG administrated rats showed significantly reduced p38 MAPK, iNOS and Nrf2 expression in the brain and medulla oblongata according to Western blot analysis. These findings suggest that KRE may have a useful effect on orificial pain control functions by preventing the p38 MAPK pathway.
Effect of Prenatal Education Program of Labor and Delivery Experience
Seong, Chun-Hee ; Park, Kyung-Min ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5716~5725
DOI : 10.5762/KAIS.2014.15.9.5716
This study examined the effects of a prenatal education program of labor and delivery experience for primigravidas in mid-pregnancy. This investigation was designed as a one group pre-post quasi-experimental study, aiming to determine the effects of prenatal education on anxiety, confidence and knowledge in delivery by demonstrating knowledge and actual situations including understanding labor, breast-feeding, baby care and others, and experiencing the education program. Subjects were collected randomly from an on-line club in D city. The simulation education proceeded for 2 hours a week from April to June, 2014, and there were 6 sessions each in the first and second periods. We included 35 primigravidas who attended all 6 sessions. The data was analyzed using descriptive statistics, exploratory factor analysis and a paired t-test. According to the study results, the subjects showed a significant difference in knowledge in delivery (t=-9.07, p<001), confidence in delivery (t=-9.00, p<001) and anxiety (t=14.39, p<001) after participating in the prenatal education program. An evaluation of satisfaction revealed experience to be the most differentiating factor, and the simulation experience was identified as most effective. The desired appropriate number of class sessions was 4 times, and 88.6% of the pregnant women intended to attend the program at their next birth, indicating a high response rate.
Qualitative study of software ILS application: Comparison analysis of maintenance types in software and hardware
Lee, Kwan-Young ; Kim, Sang-Moon ; Park, Eun-Shim ; Park, Jae-Eun ; Kim, Geun-Hyung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5726~5737
DOI : 10.5762/KAIS.2014.15.9.5726
The increasing importance of software has highlighted the need for the proper application of software ILS. On the other hand, the development of ILS has been somewhat limited to the area of hardware development. Therefore, this study examined the potential difficulties in applying software ILS to practical uses, and analyzed the drawbacks by reporting several domestic or foreign regulation cases. In addition, the differences between hardware and software ILS were examined by considering their characteristics of maintenance. Eventually, by establishing the proper range, this study proposes a development plan that is suitable for domestic weapon systems. The proposed research is expected to be helpful for offering specific plans for designing software ILS.
Design of an Electric Wheelchair Control Algorithm by Slope Recognition on uneven terrain
Kong, Jung-Shik ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5738~5743
DOI : 10.5762/KAIS.2014.15.9.5738
This paper evaluated an electric wheelchair control algorithm by slope recognition on uneven terrain. Nowadays, the population using wheelchair has been increasing rapidly due to increases in the elderly population. On the other hand, most wheelchairs are directly controlled by the user without any device capable of securing the safety of the user. This causes difficulties in wheelchair control from the influence of gravity on the slope. This paper proposes a vehicle control algorithm that can move a wheelchair similar to moving on a plane. At that time, sensors are not used to recognize the degree of the slope. All processes were verified by simulation.
Multioutput Logic Simplication Using an Exclusive-OR Logic Synthesis Principle
Kwon, Oh-Hyeong ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5744~5749
DOI : 10.5762/KAIS.2014.15.9.5744
An extraction technique for a common logic expression is an extremely important part of multiple-output logic synthesis. This paper presents a new Boolean extraction technique using an exclusive-OR logic synthesis principle. The logic circuits produced only have AND, OR and NOT gates. Heuristic methods can also be applied to reduce the execution time and the number of literals. The experimental results showed improvements in the literal counts over the previous methods.
Image Stabilization Scheme for Arbitrary Disturbance
Kwak, Hwy-Kuen ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5750~5757
DOI : 10.5762/KAIS.2014.15.9.5750
This paper proposes an image stabilization method for arbitrary disturbances, such as rotation, translation and zoom movement, using the SIFT (Scale Invariant Feature Transform). In addition, image stabilization was carried out using the image division and merge technique when moving objects appear on the scene. Finally, the experimental results showed that the suggested image stabilization scheme produced superior performance compared to the previous ones.
Effect of alumina coating on the Pull-in Voltage in Electrostatically actuated micro device
Park, Hyun-Sik ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5758~5762
DOI : 10.5762/KAIS.2014.15.9.5758
Electrostatically-actuated Micro device have been used widely in a variety of integrated sensors and actuators. Electrostatically-actuated micro devices with a gap of several micrometers or less between the electrodes have shown failure problems by electrostatic adhesion. To improve this adhesion phenomenon, micro devices of varying lengths and widths in electrodes were fabricated, and an alumina coating was then deposited using atomic layer deposition technology. The effects of improving adhesion phenomenon were compared by measuring the pull-in voltage before and after the coating process. The pull-in voltage increased with increasing length of the upper electrode after the coating. An increase in the electrode area results in an increase in the pull-in voltage after coating. The alumina coating method applied to improve the adhesion on an electrostatically-actuated micro device was observed as an effective method.
Analysis of Voice Color Similarity for the development of HMM Based Emotional Text to Speech Synthesis
Min, So-Yeon ; Na, Deok-Su ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5763~5768
DOI : 10.5762/KAIS.2014.15.9.5763
Maintaining a voice color is important when compounding both the normal voice because an emotion is not expressed with various emotional voices in a single synthesizer. When a synthesizer is developed using the recording data of too many expressed emotions, a voice color cannot be maintained and each synthetic speech is can be heard like the voice of different speakers. In this paper, the speech data was recorded and the change in the voice color was analyzed to develop an emotional HMM-based speech synthesizer. To realize a speech synthesizer, a voice was recorded, and a database was built. On the other hand, a recording process is very important, particularly when realizing an emotional speech synthesizer. Monitoring is needed because it is quite difficult to define emotion and maintain a particular level. In the realized synthesizer, a normal voice and three emotional voice (Happiness, Sadness, Anger) were used, and each emotional voice consists of two levels, High/Low. To analyze the voice color of the normal voice and emotional voice, the average spectrum, which was the measured accumulated spectrum of vowels, was used and the F1(first formant) calculated by the average spectrum was compared. The voice similarity of Low-level emotional data was higher than High-level emotional data, and the proposed method can be monitored by the change in voice similarity.
Study of the effectiveness of a supporting model for the domestic online game industry to go abroad
Joo, KiHwan ; Moon, Nammee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5769~5775
DOI : 10.5762/KAIS.2014.15.9.5769
This paper reports the political supporting platform, and the outcome evaluation model, which was developed for the Korean on-line game companies that have started to go abroad to publish their games. When they begin to sell their games, they have many difficulties in promoting in other countries including the USA & EU. They try to find solutions to solve these problems, but on-line games still do not have a successful business model because of their unique attributes and environmental features, even though they spent a lot of money and time to enter the international on line game market. Thus far, the local on-line game supporting policy has tried to improve the world competitiveness of local companies by doing diverse activities, such as Global Service Platform(GSP) service, international game competition, and globalization, marketing. On the other hand, there has been only a small number of fruitful results except for GSP. Therefore, in this paper, the result of GSP was verified using the Global on-line game Supporting Chain Model(GoGSCM), which is the new political supporting and evaluation model through survey targeting GSP participations. As a result, GSP was evaluated based on the compatibility, efficiency, effectiveness, and continuity.
Space-Frequency Block Coded Relay Transmission System for a Shadow Area
Won, Hui-Chul ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5776~5782
DOI : 10.5762/KAIS.2014.15.9.5776
Relay-assisted wireless communication systems have been studied widely to cope with shadow areas and extend the cell coverage. This paper proposes a space-frequency (SF) block coded single carrier-frequency division multiple access (SC-FDMA) transmission system in a relaying multi-path shadow area and present the performance comparison of SC-FDMA systems based on the signal-to-noise power ratio (SNR) between a relay and a destination station. The performance of relaying SC-FDMA systems can be improved by applying SF block code to the recovered signals of relays before re-transmitting them. The simulation result showed that the SNR performance of the proposed SF block coded relaying SC-FDMA system was approximately 5 dB better than the SNR performance of the single-path relaying SC-FDMA system at a symbol error rate (SER) of
Estimating The Economic Value of Information Security Management System (ISMS) Certification by CVM
Jang, Sang-Soo ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5783~5789
DOI : 10.5762/KAIS.2014.15.9.5783
Since 2002, many domestic companies have been certified for ISMS. On the other hand, certification, such as the need for ost-effectiveness evaluation, is not specifically enforced. Therefore, for more than 10 years, the ISMS implementation and certification system has been used for performance and cost effective business management. In this study, a model for analyzing the effect of certification organizations, ISMS development, and an analysis of the effect of a standardized system for the study was prepared. To this end, the existing maintenance organizations ISMS certification survey was conducted through an analysis of the economic effects. ISMS certification continues to expand or maintain the policy for improvement. The survey data collected by the analysis mechanism for the economic effects of CVM was analyzed.
Study of the Real Number Field Extension Operand of Elliptic Curve Cryptography
Woo, Chan-Il ; Goo, Eun-Hee ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5790~5795
DOI : 10.5762/KAIS.2014.15.9.5790
Elliptic curve cryptography (ECC) is an extremely important part of information protection systems because it has outstanding safety among public key encryption algorithms. On the other hand, as ECC cannot obtain accurate values using a real number field because of the slow calculation and errors from rounding off, studies of ECC have focused on a finite field. If ECC can be extended to the real number field, more diverse keys can be selected compared to ECC only based on a finite field. Accordingly, in this paper, a method for constructing a cryptographic system with a high degree of safety is proposed through the diversification of keys selected by the user based on the operant extension method instead of extracting keys only using integer values.
Reconfigurable beam steering U-slot patch antenna with high gain for a wireless headset
Kang, Seonghun ; Yeom, Insu ; Jung, Changwon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5796~5800
DOI : 10.5762/KAIS.2014.15.9.5796
This paper presents reconfigurable beam steering patch antenna with high gain for a wireless headset. Because existing antenna for wireless communication in headsets has an omni-directional radiation pattern, it has a deleterious effect in the vicinity of the human head. To reduce this effect, this paper proposed an antenna comprised of a U-slot and manufactured on a FR-4 substrate. The antenna operating at the 2.37-2.5 GHz band used a tapered matching method to match the impedance between the feed part and patch part. To implement the beam steering capability, the antenna used two PIN diodes. Using PIN diodes, the antenna presented three states (
) in the maximum beam directions of the YZ-plane (
, respectively). The peak gains of the antenna in the headset were 4.22-5.15 dBi. The fabricated antenna could communicate efficiently with a wireless headset.
Analysis of Flood Level Mitigation due to the Naju Retention-Basin by Numerical Model Application
Rhee, Dong Sop ; Kim, Hyung-Jun ; Cho, Gilje ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5801~5812
DOI : 10.5762/KAIS.2014.15.9.5801
The retention basin is a hydraulic structure for flood mitigation by storing river flow over a design flood. In this study, numerical models were adopted to simulate the flood mitigation effects by a retention basin. The large flood condition was applied as a boundary condition to consider an abnormal flood caused by climate change. Furthermore, the two-dimensional numerical model was adopted to regenerate the complex flow pattern due to the topography and lateral flow near the retention basin. The numerical results of the one- and two-dimensional model were analyzed and compared. The results showed that the two-dimensional model is more applicable to assessing flood mitigation by the retention basin with a complex topography and lateral flow patterns.
Analysis of Infiltration Trench Facility for Runoff Reduction Effect
Yeon, Jong Sang ; Jang, Young Su ; Shin, Hyun Suk ; Kim, Eung Seok ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5813~5819
DOI : 10.5762/KAIS.2014.15.9.5813
LID planning and application has been actively developed to reduce the runoff volume at increased impervious areas due to rapid urbanization. In this study, a performance and applicability evaluation was performed in an infiltration trench using the SWMM model, based on the experimental conditions for infiltration trenches. The infiltration trench application area was applied to 5~15% of the drainage area. The SWMM results of discharge and the BOD reduction efficiency were analyzed at a peak discharge of 45.7~61.9%, total discharge of 47.2~62.3%, and BOD load of 52.3~55.3. The discharge and BOD was estimated to be 12~24% higher and 37~38% smaller than the experimental results. This study can help in the application and performance evaluation of infiltration trenches.
Verifying the Suitability or Unsuitability of the Opening Force Criteria Applied to Air Pressurized Access Door to a Smoke Control Zone
Lee, Jae-Ou ; Choi, Chung-Seog ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5820~5825
DOI : 10.5762/KAIS.2014.15.9.5820
The aim of this study was to verify the suitability or unsuitability of Korean body types by measuring the opening force criteria of an air pressurized access door to a smoke control zone. The opening force criteria were verified by comparing the NFSC 501A, NFPA 92A and BS-EN 12101-6 based on the body standards information from the Korean Agency for Technology and Standards. When measuring the opening forces, the posture of the body should be standing upright and pushing an access door with the right hand, which is a criterion for designing doors. As a result of analyzing the actual measurement results, the pushing force of men and women in their 30's was the maximum value and the forces in those in their 60's was the minimum value. In addition, the deviations in the pushing forces varied considerably. As a result of comparing the NFSC 501A, the men showed lower values than the criteria in every gender and age variable except for the 20's, 30's and 50's variable. A comparison of the criteria of NFPA 92A showed that the mean of the measured values from every gender and age was also lower than the criteria. In addition, when comparing the criteria of BS-EN 12101-6, it was found that the men in every age variable were higher than the criteria. On the other hand, the women in every age variable were lower than the criteria. Therefore, considering the Korean body type against the Western body type, it was decided that the opening force of an access door to a smoke control area to make a downward adjustment should be 110 N in the local criteria. Furthermore, the criteria should consider the characteristics of buildings and users because an optional application of the international standard is not necessarily suitable for local situations.
Study of the Tidal Currents in Sea Areas around Gyeong-In Waterway
Baek, Seung Hwa ; Shin, Bum-Shick ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5826~5834
DOI : 10.5762/KAIS.2014.15.9.5826
This paper examined the changes in flow patterns due to a blockage of tidal currents in the sea areas between Incheon North Port and Yeomha Channel when it would be influenced by the construction of the Incheon North Port Yeongjongdo dredged soil dumping ground and Incheon Bay tidal power plant. The numerical simulation was performed for three cases: before and after constructing the Incheon North Port Yeongjongdo dredged soil dumping ground and after the construction of the sea-dyke on the east side of the Incheon Bay tidal power plant. The simulation results showed that the tidal directions and currents velocity were similar before and after the construction of the Yeongjongdo dredged soil dumping ground. After the construction of the East Sea-dyke of Incheon tide power plant, however, the tidal currents patterns changed significantly due to flow blockage toward Gyeonggi Bay. The main flow was formed in the north-south direction, and the tidal currents velocity increased slightly on the downstream areas (A,B,C) of Hodo, which is the entrance of the Ara Waterway. The tidal currents at the mouth(D) of Yeomha Channel decreased significantly. The tidal currents of the west side of Se-eodo and the east side of the sea-dyke were rotary currents. The results of this study will provide basic data for the environmental impact assessment and the operation of the Gyeongin Ara Waterway.
Hwanghae-Gamsa's Sulryeok and Utilization of Governing Institutions from the 18
Century to the Early 19
Yeo, Sang-Jin ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5835~5843
DOI : 10.5762/KAIS.2014.15.9.5835
This study examined the Hanghae-Gamsa's (the local governor of Hanghae-Do) utilization of the governing institutions in Hanghae-Do during the Sulryeok (an inspection tour around the Gamsa's ruling area). For this purpose, the four Hanghae-Gamsa's official diaries were closely investigated, which were written from the 18th century to the early 19th century. The main results of this study are as follows: 1) the routes of Hanghae-Gamsa's Sulryeok and some sightseeing parts; 2) the arrival route of newly appointed Hwanghae-Gamsa and the site of Gyogwui (the change-over ritual ceremonies) between old and new Hwanghae-Gamsas; and 3) utilization of governing institutions in Hanghae-Do during the Sulryeok focusing on his duties and ritual ceremonies.
Shear Performance of RC Beams Using Ductile Fiber Reinforced Cementitious Composite (DFRCC)
Eo, Seok-Hong ; Son, Ki-Min ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5844~5853
DOI : 10.5762/KAIS.2014.15.9.5844
This paper presents the results of experimental investigations on the shear failure behaviors of reinforced concrete beams using ductile fiber reinforced cementitious composite (DFRCC). Total 10 RC beams of
size were tested by 4-point bending under the displacement control. The main parameters of the experiment are surface treatment by grinding and preloading to the cracking point in the repair process. The load-displacement curves, diagonal tension cracking load, flexural cracking load, and shear strength were obtained. The test results showed that the DFRCC can be used effectively for restoring the shear strength approximately 99% to the original value under the condition that the appropriate thickness and surface treatment like grinding are assured. For further research, the specimens taken from real deteriorated structures will need to be tested after being repaired with DFRCC.
On-site Performance Evaluation of a Vision-based Displacement Measurement System
Cho, Soojin ; Sim, Sung-Han ; Kim, Eunsung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5854~5860
DOI : 10.5762/KAIS.2014.15.9.5854
The on-site performance of a vision-based displacement measurement system (VDMS) was evaluated through a field test on a bridge. The VDMS used in this study is composed of a camera, a marker, a frame grabber, and a laptop. The system measures the displacement by attaching a marker at the location to be measured on the structure, by capturing images of that marker with a fixed rate, and by processing a series of images using a planar homography technique. The developed system was first validated from a laboratory test using a small-scale building structure. The VDMS was then employed in a field test on a railroad bridge with a KTX train running under various conditions. The on-site performance was evaluated by comparing the obtained displacement using the VDMS with the displacement measured from a laser Doppler vibrometer (LDV), which is an expensive and accurate displacement measurement device.
Usage Status and Environmental Sustainability Guidelines for Building Exterior Materials
Park, Jong-Soo ; Ko, Hune-Bum ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5861~5869
DOI : 10.5762/KAIS.2014.15.9.5861
Existing studies of building exterior materials have focused on the colors or textures of cladding, and in terms of a design planning approach, have focused on the use of the environment and equipment and fire safety topics from an engineering perspective. As a result, little research has been done on performance guidelines for exterior materials, specifically according to the building type. Research into eco-friendly cladding materials is also in the rudimentary stage in a practical sense. In this study, the use of exterior materials over the last ten years in domestic construction was analyzed. The usage status of building exterior materials was evaluated quantitatively by frequency analysis, and its environmental performance is proposed through complex (qualitative + quantitative) analysis. The average value of the exterior material type number used for all analyzed buildings was 2.59. Glass, metal, stone, resin, cement, wood, and clay were used in that order with regard to the usage status. The analysis found that five of the materials satisfied the high efficiency and eco-friendly grading in terms of the four characteristics of an eco-friendly exterior. A list of eight eco-friendly elements was also proposed. The eco-friendly elements and characteristics of the exterior materials were derived to provide basic guidelines for domestic construction companies and design offices.
System Architecture for Effective Point Cloud-based Reverse Engineering of Architectural MEP Pipe Object
Kang, Tae-Wook ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5870~5876
DOI : 10.5762/KAIS.2014.15.9.5870
The aim of this study was to suggest the System Architecture for Effective Architectural MEP Pipe Reverse Design(PRD) based on the Point Cloud and derive the consideration. To do this, the requirement and use-cases related to the MEP pipe reverse design work were defined and the architecture for the reverse design automation was proposed. To identify a consideration for finding the architecture issues, a prototype was developed using the architecture and evaluated.
Study of the Effects of Ambient Temperature and Car Heater Power on the Train Cabin Temperature
Cho, Youngmin ; Park, Duck-Shin ; Kwon, Soon-Bark ; Jung, Woo-Sung ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5877~5884
DOI : 10.5762/KAIS.2014.15.9.5877
Recently, abnormally cold weather has been reported more frequently in winter due to the climate change and abnormal weather changes. On the other hand, the heating capacity of a railcar may be not enough to warm the cabin under severe cold climatic conditions, which is one of the reasons for the passengers' complaints about heating. In this study, the effects of ambient temperature and heater power on the cabin temperature was investigated to obtain the minimum ambient temperature for the tested railcar. The test railcar was placed in a large-climatic chamber, and various ambient temperature conditions were simulated. The effects of the heater output were investigated by monitoring the cabin temperature under a range of heater output conditions. The mean cabin temperature was
, which was far lower than the required minimum temperature of
, under a
ambient temperature condition with the maximum heat power. When the ambient temperature was set to
, the maximum achievable cabin temperature was
. Through calculations using the interpolation method, the minimum ambient temperature to maintain an
cabin temperature was
for this car. The vertical temperature difference was higher with a higher power output and higher ambient temperature. The maximum vertical temperature difference was higher than
in some cases. However, the horizontal temperature difference vs. low temperature (<
) was independent of the power output and ambient temperature. As a result, it is very important to reduce the vertical temperature difference to achieve good heating performance.
Classification and Antioxidant Activities of Mangrove Plants in Weno Island, Micronesia
Chung, Youngjae ; Hwang, Jinik ; Suh, Sung-Suk ; Park, Mirye ; Kim, Donggiun ; Park, Jongbum ; Lee, Taek-Kyun ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5885~5892
DOI : 10.5762/KAIS.2014.15.9.5885
Mangrove plants serve as a sink of heavy metals and contain phenolic compounds at a high level. Therefore, with mangrove plants, recent studies to develop phytoremediation and natural antioxidants have been conducted in the commercial and academic fields. In the present study, six mangroves in Weno Island of Micronesia were investigated for their phylogenetic relationship and antioxidant activities. First, to determine the phylogenetic relationship among them, rbcL (large subunit of ribulose-bisphosphate carboxylase), one of the chloroplast genes, was used as a molecular marker. According to the data, Xylocarpus, Sonneratia and Rhizophora showed close similarity but not Excoecaria. The levels of phenolic compounds in the bark were abundant in R. apiculata and X. granatum, accounting for 1.10 mM/mg, while R. stylosa and S. alba contained the low amounts, representing 0.73 mM/mg and 0.72 mM/mg, respectively (p<0.05). In addition, bark extracts from R. apiculata, X. granatum, X. moluccensis, and E. agallocha had high antioxidant activities through the DPPH radical scavenging activity and ABTS analysis, whereas S. alba showed the lowest activities. These results suggest that the bark of R. apiculata can be used as a good source for the development of natural antioxidants.
Modeling & Operating Algorithm of Islanding Microgrid with Wind Turbine, Diesel Generator and BESS
Kim, Jae-Eon ;
Journal of the Korea Academia-Industrial cooperation Society, volume 15, issue 9, 2014, Pages 5893~5898
DOI : 10.5762/KAIS.2014.15.9.5893
This paper proposes a modeling method and operating algorithm of an islanding microgrid that is composed of a Battery Energy Storage System (BESS), wind turbine and diesel generator applied in island areas. Initially, the bilateral AC/DC converter was designed for charge/discharge for frequency and voltage to be maintained within the proper ranges according to the load and weather change, and the operating method was proposed for a diesel generator to operate when power supply from the wind turbine or BESS is insufficient. The proposed modeling and controller design method of BESS was applied to a typical islanded microgrid with a wind turbine and diesel generator. The frequency and voltage was kept within the permissible ranges and the proposed method was proven to be appropriate through simulations.