• Korean Journal of Applied Biomechanics
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• 제16권4호
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• pp.125-134
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• 2006

The purpose of this study was to analyze the Biomechanical elements by looking at the differences on the motions of the right and left spikes of right-handed offense volleyball players, using 3D image analysis and force platform. For that purpose, spike motions of six male university volleyball players were recorded three times each using two 16mm high speed cameras and the speed of recording was set at 60 frames/sec. The coordinated raw data was leveled as 6Hz using low pass filtering method and the calculation of 3D coordinates was done by using a DLT (Direct Linear Transformation) method. Also KWON 3D program was used to analyze the variables. Through the experiments and research, the following results were found: That is, in case of the right spike, the required time from the toss to the impact, which affected the success rate of offense showed as longer and on the take-off, the exact timing to touch the ball was longer because the pace between right and left feet was wider, and also after the jump, the distance between the feet indicated shorter, than the left. In addition, the degree of somersault and horizontal adduction of shoulder joint was smaller and the degree of medial rotation of shoulder joint showed bigger than the left, so it indicated that it was not centered on the body, but by the arm with an axis of shoulder using a swing motion. After the impact, the speed of the ball indicated slower compared to the left spike.

• Magazine of the Korea Concrete Institute
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• 제7권4호
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• pp.169-179
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• 1995

The purpose of this study is to spread beam plastic hinging zone of the high-strength($f'_c=700kg/cm^2$) reinforced concrete beam-column joints away from the column face by vertically anchored intermediate reinforcements. The newly proposed intermediate reinforcements which are vertically anchored by interlinking each intermediate rebars are tested to insure the ductile behavior of R /C beam-column joins. Main variable is the shape of intermediate reinforcements. From the test results, the newly proposed intermediate rebar detail can move arid expand the beam plastic hinging zone about 1.Od from column face and can delay the strength decay of the high-strength R /C beam-column joint. Also energy dissipation capacity of specimen IV-1.OD10 which is reinforced by vertically anchored intermediate rebars about 1.0d is 1.6 times as high as the specimen CM-STAN which is designed by ACI318-89.

• Journal of Broadcast Engineering
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• 제13권6호
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• pp.905-914
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• 2008

The paper studied the scheme of applying the MPEG-4 SVC signal to the Ka band satellite broadcasting system through the JSCC system to resolve the rain fading problem generated when providing the Ka band HDTV satellite broadcasting service. The Ka band satellite broadcasting system is based on the VCM mode of the DVB-S2, and the SVC signal is considered as one of the spatial scalability, the SNR scalability and the temporal scalability. The JSCC system jointed all the layers of the source coding system and the channel coding system, and allocated bit rate to source coding and channel coding for each layer to get the optimum receiving quality. The layers are consists of a base layer and an enhancement layer, and the bit rate of each layer is affected by the SVC signal. The applicability of the three SVC signals to the Ka band satellite broadcasting service is analyzed with respect to the rain fading, and the scheme of applying the most excellent SVC to the service is considered.

• Journal of muscle and joint health
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• 제11권1호
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• pp.50-60
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• 2004

Purpose: The purpose of this study was to examine the relationships among the health promoting behavior, pain, self-esteem, family support, self-efficacy in patients with chronic arthritis. Method: The data for this study were collected from February 19, 2003 to April 7, 2003. The subjects were 150 chronic arthritis patients who visited University Hospital in D City. The research instruments used in this study were HPLP II, Visual analogue scale, Self-esteem scale, Family support scale, Self-efficacy scale. In data analysis, SPSS PC ver 10.0 program was utilized and data were analyzed using descriptive statistics and t-test, ANOVA, Multiple Stepwise Regression and Pearson's correlation coefficient. Result: The average score of the pain, self-esteem, family support, self-efficacy, health promoting behavior was 5.38, 3.37, 4.29, 70.30, 2.68, respectively and the variable with the highest degree of it's subscale was interpersonal support(3.08), whereas the one with the lowest degree was exercise(1.66). There was a positive correlation(r=.327, p=.000) between the self-esteem and health promoting behavior. There was a positive correlation(r=.540, p=.000) between the family support and the self-efficacy and health promoting behavior. Family support, self-efficacy and marital status were significant factors to explain a variance of health promoting behavior in patients with chronic arthritis(51.6%). health promoting behavior. There was a positive correlation(r=.477, p= .000) between Conclusion: The health promoting behavior were positively correlated with self-esteem, family support and self-efficacy. These findings help to understand relationships among self-esteem, family support and self-efficacy in chronic arthritis patients. In addition, family support, self-efficacy and marital status were the mainly influencing factors of health promoting behavior. Among these variables family support was the most significant factor to predict a health promoting behavior. According to the results of this study, family support must be considered as a main factor in the nursing strategy for health promoting behavior of chronic arthritis patients.

• Composites Research
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• 제30권1호
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• pp.52-58
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• 2017

This paper presents the optimum design methodology for composite wing structure which automatically calculates the safety margin using optimization framework integrating failure modes. Particularly, its framework is possible to optimize sizing procedure to prevent failure mode which has the greatest effect on reducing the sizing time of composite structure. The main failure mode was set as the first ply failure, buckling failure mode, and bolted joint stress field, and the margin was calculated to minimize the weight. The design variable is a laminate sequence database and the responses are strain, buckling, bolted joint stress field. The objective function is the mass of the wing structure. The results of buckling analysis were compared using the finite element model to verify the robustness and reliability of Composite Optimizer.

• Journal of muscle and joint health
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• 제10권1호
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• pp.7-18
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• 2003

This study was to investigate the effects(pain, discomfort, and range of motion) of heat therapy according to the application time among the elderly with osteoarthritis. Study participants were 27 elderly women, who were diagnosed as osteoarthritis, suffered from it for more than 6 months, and who were staying at a nursing home in Busan. The independent variable was heat therapy, which was applied for 20minutes, one time per week according to 3 timetable(before waking up, while in daily living, before going to bed) over 6 weeks. The dependent variables were pain and discomfort measured by 20 points visual analog scales, and range of extension and flexion measured by goniometery. The data were analyzed by descriptive statistics and repeated measures ANOVA. The results were as follows ; 1) There were significant differences for pain(F=9.77 p=.0001), discomfort(F=8.07 p=.001), range of extension(F=3.05 p=.05), and flexion(F=9.67 p=.0001) among heat therapy application times. 2) There were significant differences for pain(F=58.18 p=.0001), discomfort(F=63.68 p=.0001), range of extension(F=11.59 p=.001), and flexion(F=17.59 p=.0001) between before and after applying heat therapy. 3) There were not statistically significant differences for pain(F=.64 p=.531), discomfort(F=.18 p=.836), range of extension(F=1.33 p=.270), and fiexion(F=.26 p=.773) between before and after applying heat therapy according to the heat therapy application times. In conclusion, heat therapy was effective in reducing pain and discomfort, and in improving ROM for the elderly with osteoarthritis, but the effect of it was not different according to the time of application. We recommended further studies with larger sample size, longer and more repeatedly applied to investigate the effect of heat therapy according to the time of application.

• Journal of muscle and joint health
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• 제10권1호
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• pp.19-31
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• 2003

Purpose : The purpose of this study was to examine the effect of the self- efficacy, group cohesion and family support on adherence of aquatic exercise in arthritis patients. Method : The Subjects were 30 patients with arthritis who had participated in the 6-week aquatic exercise programs of Korean Rheumatology Health Professionals Society. All subjects were interviewed from November to December, 2001(1st) and Feburary, 2002(2nd) using a structured questionnaire which was composed of 42 items. SPSS Win 10.0 was used for data analysis. Results : Ten out of thirty were adherer who were keeping aquatic exercise for three months since they completed 6-week aquatic exercise program. The major reasons of adherence were affectional reasons and general condition improvement on the first month. The reasons of 3-month adherence were improvement of arthritis symptoms, affectional improvement, expectations, general condition improvement and group activity. The major reasons of drop out were environment factors and physical factors. The environmental reason were time shortage, economic problem and long distance. And the physical factor were cold, pain and other health problem. The scores of self-efficacy were decreased from 528.00 to 476.00 within 3 months after compeleting aquatic exercise program and that was statistically significant(p=.029). But there were no statistically differences in group cohesion and family support. There was a significant positive correlation between exercise adherence and self-efficacy. Factors influencing the exercise adherence was self-efficacy which accounted for 23% of the variance in the exercise adherence. Conclusion : In conclusion, self-efficacy is a significant variable in the exercise adherence and changes within 3 month after completing aquatic exercise program. The results of this study suggested that the strategy for maintaining self-efficacy should be developed.

• Korean Journal of Applied Biomechanics
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• 제14권1호
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• pp.27-40
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• 2004

The purpose of this study was to provide basic data for improving athletic performances by analyzing the kinematic variables of the Double Backward Somersault on the Parallel Bars through the 3D motion analysis. The subjects in this study were 5 male gymnasts who were ranked as national athletes. The results are as follows. 1. A total time(Mean Time) of performance showed $2.72{\pm}0.82\;sec$. and flight time to landing after releasing was 0.87sec.(mean). In order to perform better stable flying movement, the flight time should be increased. 2. In the change of velocity of the center of mass, when the increasing ascension velocity of the upper point was high, the position in the top point was high on releasing. 3. In the position variable of the center of mass, the mean of upper-bottom position in horizontal posture was $242.1{\pm}6.5cm$, $232.8{\pm}6.4cm$ in releasing, and $265.0{\pm}5.6cm$ in the highest point. This result is explained that the position of center of mass can be raised by using elastic power when wrist raised the bar in the releasing movement. 4. The angle of shoulder joint was $271.1{\pm}14.0$. Such a big angle influences a negative effect on the releasing velocity, because trunk is not a position in the enough vertical direction. 5. The ankle of hip joint in hand-standing was $191.1{\pm}5.9$, $118.8{\pm}5.3$ in releasing, and $122.3{\pm}5.3$ in taking on. Therefore, the result suggests that trunk should be straightly raised in taking on.

• Journal of Korea Water Resources Association
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• 제46권8호
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• pp.795-805
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• 2013

Drought is one of the severe natural disasters and it can profoundly affect our society and ecosystem. Also, it is a very important variable for water resources planning and management. Therefore, the drought is analyzed in this study to understand the drought distribution and trend. The Standard Precipitation Index (SPI) is estimated using precipitation data obtained from 55 rain gauge stations in South Korea and the SPI based drought variables such as drought duration and drought severity were defined. Drought occurrence and joint probabilistic analysis for SPI based drought variables were performed with run theory and copula functions. And then the return period and spatial distribution of droughts on the South Korea was estimated. As the results, we have shown that Gongju and Chungju in Chungcheong-do and Wonju, Inje, Jeongseon, Taebeak in Gangwon-do have vulnerability to droughts.

• Proceedings of the Korea Concrete Institute Conference
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• 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
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• pp.89-92
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• 2008

This study investigates the shear behavior of architectural masonry veneer wall reinforced with specific reinforcement details proposed by this study. For this purpose, experimental tests were conducted using one un-reinforced masonry(URM) wall specimen and three reinforced masonry(RM) wall specimens under quasi static cyclic loads. Un-reinforced(plain) masonry wall is expressed that behavior and failure mode are different for aspect ratio(L/H) and axial compressive force. The test variables are wall aspect ratio and presence of reinforcement. These specimens are masonry structure for architectural clading that is not to exist the axial compressive force. thus the axial compressive force is excepted from test variable. Test result, Behavior of specimens are dominated over rocking mode, but final failure modes are combined with different behaviors. And FEMA273 has proposed the equation of shear strength of masonry pier subjected to in-plane loading. Shear strength equations are classified four types of failure mode that is Rocking, and Toe-Crushing, Bed-Joint-Sliding and Diagonal-Tension. FEMA273 equations predict the behavior modes well, but shear strength is shown in different result.