고강도 강관과 PHC파일이 활용된 흙막이 버팀보의 좌굴해석 및 설계

임승현,김인규,김성보,Lim, Seung Hyun,Kim, In Gyu,Kim, Sung Bo 한국강구조학회 2015 韓國鋼構造學會 論文集 Vol.27 No.4

본 연구에서는 고강도 강관과 PHC pile을 활용한 흙막이 버팀보의 좌굴거동과 설계를 수행하였다. 조립기둥의 형식 세가지와, 연결방식, 버팀보의 전체길이(30m, 60m, 90m)에 따라 다양한 버팀보 시스템에 대한 좌굴해석을 하였고, 주부재의 국부좌굴 및 전체좌굴, 사재좌굴에 대해 유한요소해석을 통해 계산된 좌굴하중을 엄밀해와 비교분석하였다. 고강도강관 설계가이드와 PHC pile로 조립된 기둥의 P-M상관도를 활용하여 조립기둥의 설계를 수행하였다. The design and buckling behavior of earth retaining system supported by high strength steel pipe and PHC pile under compression is presented in this study. Buckling analysis of various strut system was investigated according to the strut total length(30m, 60m, 90m), three types of built-up columns and connection condition. Buckling loads calculated by F.E analysis was compared with the theoretical solution corresponding to diagonal buckling mode, local and global buckling mode of main strut. The design of the built-up column struts are performed based on design guide for high strength steel pipes and P-M diagram for built-up column with two PHC pile section.

토양의 온도와 수분이 크리핑 벤트그래스(Agrostis palustris Huds) 생육에 미치는 영향

임승현,정준기,김기동,주영규,Lim, Seung-Hyun,Jeong, Jun-Ki,Kim, Ki-Dong,Joo, Young-Kyoo 한국잔디학회 2009 한국잔디학회지 Vol.23 No.2

여름철 고온 다습한 우리나라 기온에서 토양 온도와 수분은 잔디의 생리학적 변화를 초래하며, 특히 한지형 잔디생육은 우리나라 여름철 기후의 특이성에 많은 영향을 받는다. 본 실험은 크리핑 벤트그래스(Agrostispalustris Huds.)를 이용하여 고온의 조건에서 각기 다른 토양 수분함량 조건에서의 한지형 잔디생육을 관찰하였다. 구체적인 실험 방법으로는 수분함량과 온도에 따른 bentgrass의 생육 및 생리적 스트레스 반응을 평가하였다. 모의 USGA(United State of Golf Association) 그린 조건에서의 토양 온도 및 열 특성 실험 결과 수분이 거의 없는 건조 상태에서의 토양 온도는 $34^{\circ}C$로 발열 했을 때 토양 표면 온도가 $80^{\circ}C$까지 올라가는 것을 알 수 있었다. 반면, 과수분 조건에서 $34^{\circ}C$ 발열을 했을 때에는 건조 조건에 비해 상대적으로 $10^{\circ}C$가 낮은 것을 알 수 있었다. 실험 포장에서의 온도와 수분에 따른 열 특성 변화는 관수시기와 무관하게 처리구 모두에서 관수 후에 열전도도(thermal conductivity), 열 확산성(thermal diffusivity), 및 토양 온도가 증가하였다. 이는 수분이 공기에 비해 상대적으로 높은 열전도도를 갖기 때문으로 사료된다. 또한, 본 실험에서 관수 초기에는 과수분 조건에 비해 수분 결핍 조건에서 토양 온도의 증가를 보였으며, 시간이 지남에 따라 과수분 조건에서 더 높은 토양 온도의 증가를 확인하였다. 즉, 토양 온도는 과수분 조건에서 열전도에 의해 높아져 잔디의 생육에 영향을 미친다. 이는 잔디 표면부 온도가 높은 시각대의 과도한 관수는 여름철 잔디의 생육에 부정적 영향을 미치며, 소나기 등에 의한 일시 침수 시 지반배수의 불량은 잔디 생육에 치명적인 요인이 될 수 있다는 것을 의미한다. The high temperature and water content in soil profile probably affect the physiological disorder especially on cool-season turfgrasses in warm and humid weather of Korean summer. The purpose of this research was to analyze the effect of soil temperature and water content on the growth and stress response of creeping bentgrass(Agrostis palustris Huds.) under a humid and warm temperature. USGA(United State of Golf Association) green profile in laboratory test, Daily temperature changes were tested under a dried sand, 70% water content of field capacity, and saturated condition at $34^{\circ}C$ of the USGA green in lab. In this test, the dried sand reached to $80^{\circ}C$, however, the surface temperature decrease of $10^{\circ}C$ on the saturated condition. In the thermal properties test in field, thermal conductivity, thermal diffusivity, and soil temperature were increased followed by irrigation practise. In the water-deficient condition, the highest soil temperature was reached temporally right after irrigation, however, the excessive soil water content higher than field water holding capacity showed the highest soil temperature after a while. This result indicated that a heat damage to root system was caused from the thermal conductivity of a high surface soil temperature. The excessive irrigation when a high turf surface temperature should occur a negative result on tufgrass growth, moreover, it would be fatal to root growth of creeping bentgrass, especially when associated with a poor draining system on USGA sand green. Overall, this study shows that high soil temperature with water-excessive condition negatively affects on cool-season grass during the summer season, suggesting that excessive irrigation, over 70% field capacity of soil condition, does not help to reduce soil temperature for summer season in Korea. In the study that cool-season grass were treated with different water content of soil, The soil had higher temperature and more water holding capacity when treatment rate of soil conditioner was increased. The best growth at the normal water condition and the worst state of growth at thee water-excessive condition were observed.

63Sn-37Pb 솔더 스트립에서의 Electromigration 거동

임승현,최재훈,오태성,Lim Seung-Hyun,Choi Jae-Hoon,Oh Tae-Sung 한국마이크로전자및패키징학회 2004 마이크로전자 및 패키징학회지 Vol.11 No.2

63Sn-37Pb 공정솔더의 electromigration 현상을 용이하게 관찰하기 위해 63Sn-37Pb 공정솔 더를 증착하여 스트립 형태의 시편을 제작 후 electromigration 테스트를 실시하였다. $80{\sim}150^{\circ}C$의 온도 및 $1{\times}10^4{\sim}1{\times}10^5\;A/cm^2$의 전류밀도에서 electromigration 테스트시 스트립 형상의 63Sn-37Pb 솔더 합금에서 hillock과 void의 발생이 관찰되었으며, 온도와 전류밀도가 높아질수록 void의 형성이 빨라져서 평균파괴시간이 단축되었다. 평균파괴시간을 이용하여 Black의 식으로부터 구한 63Sn-37Pb 솔더 스트립의 electromigration에 대한 활성화 에너지는 $0.16{\sim}0.5\;eV$이었다. To facilitate the observation of the electromigration of 63Sn-37Pb eutectic solder, strip-type samples were fabricated by solder evaporation. The electromigration test for the 63Sn-37Pb solder strip was conducted at temperatures of $80{\sim}150^{\circ}C$ and the current densities of $1{\times}10^4{\sim}1{\times}10^5\;A/cm^2$. With increasing temperature and the current density, mean-time-to-failure(MTTF) decreased due to the formation of hillock and void in the solder strip. The activation energy for the electromigration in the 63Sn-37Pb solder strip was analyzed as $0.16{\sim}0.5\;eV$ using Black's equation.

씨름대회 관람동기와 개최도시 이미지 및 태도가 관람만족도에 미치는 영향

임승현(Lim, Seung-Hyun),김태영  (Kim, Tae-Young),김명미(Kim, Mying-Mi),남경완(Nam, Kyung-Wan) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.1

The purpose of this study was to define the relationship and the effect of motivation of spectator and the image and attitude of the hosting city to the spectator satisfaction for a Korean wrestling tournament. For the study, spectators of Chungcheongbukdo Boeun Korean Wrestling Tournament of 2011 and Ulsan City Danoh Korean Wrestling Tournament have been recruited and the total of 357 subjects were chosen to be studied using SPSS 17.0 statistical program to perform frequency analysis, one-way ANOVA, Independent Samples t-test, Correlation Analysis, and Multiple Regression Analysis to produce following results: For the subjects under 31-50 who showed high willingness to continue to watch were driven by technical motivation and the subjects with specialized profession continued to watch due to sexual motivation. For the subjects working in a regular company, degree of satisfaction was higher with higher willingness to continue to watch yielding higher customer satisfaction. For the older workers with more than 2 million won income and willingness to continue to watch had high regard for the city"s image and attitude. There is a positive inter-causal relationship between the motivation, satisfaction, city"s image and attitude. Among the motivation to watch, event motivation, achievement by proxy, and charming motivation have positive effect on spectator satisfaction in terms of acquisition of technique. Among the motivation to watch, event motivation, achievement by proxy, and team motivation have positive effect on spectator satisfaction Lastly, the attitude towards the city showed positive effect on spectator satisfaction in acquisition of technique and the image and attitude of hosting city had positive effect on spectator satisfaction.

스포츠센터 이용자의 선택속성이 공동체의식과 사회적상호작용에 미치는 영향

임승현(Seung-Hyun Lim),남경완(Kyung-Wan Nam) 학습자중심교과교육학회 2023 학습자중심교과교육연구 Vol.23 No.15

목적 본 연구는 스포츠센터 이용자의 선택속성이 공동체의식과 사회적 상호작용에 미치는 영향을 규명하기 위해 실시되었다. 방법 이를 위하여 D광역시 스포츠센터 3곳 총 299명의 스포츠센터 이용객을 연구대상자로 자료를 수집하여 Windows용 SPSS 29.0 프로그램을 이용해 연구대상에 대한 빈도분석과 연구척도인 선택속성과 공동체의식, 사회적 상호작용에 대한 요인분석, 신뢰도분석, 상관관계분석, 회귀분석을 실시하였다. 결과 첫째, 선택속성은 공동체의식의 모든 하위요인과 사회적 상호작용 중 사회적지지와는 정적인 상관관계가 나타났지만 사회적 상호작용 중 낙인과는 부적인 상관관계가 있는 것으로 나타났다. 둘째, 스포츠센터 이용객의 선택속성 중 시설과 프로그램 요인은 공동체의식의 하위요인인 친밀성과 소속감, 조화와 단결, 자발적 참여의사 표현, 동일시와 공과의 공유, 자율성과 공공의식에 정적인 영향을 미치는 것으로 나타났고, 접근성 요인은 자발적 참여의사와 권위적 집단주의에 정적인 영향을 미치는 것으로 나타났다. 셋째, 스포츠센터 이용객의 선택속성 중 프로그램과 접근성 요인은 사회적 상호작용 중 사회적지지와 낙인 요인에 정적인 영향을 미치는 것으로 나타났고, 비용 요인은 사회적 상호작용 중 사회적지지에는 정적인 영향을 미치나 낙인 요인에는 부적인 영향을 미치는 것으로 나타났다. 결론 결론적으로 스포츠센터 이용자의 선택속성이 공동체의식과 사회적상호작용에 영향을 미친다. Objectives The purposes of this study were to influences of choice characteristics of sport center users on community spirit and social interactions. Methods The study was conducted with collection and analysis of the data on the subjects consisting of 299 users of three sports centers in D Metropolitan City in order to identify the influences of choice characteristics of sport center users on community spirit and social interactions. Collected data were processed with frequency analysis and factor analysis, reliability analysis, correlation analysis, and regression analysis with use of Windows SPSS 29.0 program, and the conclusion was obtained as shown below. Results First, choice characteristics showed positive correlation to all sub-factors of community spirit and social support in social interactions but showed negative correlation to stigmatization in social interactions. Second, factors of facilities and programs in choice characteristics of sport center users showed positive influences on sub-factors of community spirit such as intimacy and belonging, harmony and unity, expression of intention of voluntary participation, identification and sharing of merits and demerits, and autonomy and public consciousness and accessibility factor showed positive influences to intention of voluntary participation and authoritative collectivism. Third, program and accessibility factors in choice characteristics of sport center users showed positive influences on social support and stigmatization factors in social interactions and cost factors showed positive influences on social support in social interactions but negative influences on stigmatization factors. Conclusions In conclusion, the influences of choice characteristics of sports center users affect community spirit and social interaction.

중ㆍ고등학교 펜싱선수들의 정서경험과 정서표현성이 경쟁상태불안에 미치는 영향

임승현(Lim, Seung-Hyun),남경완(Nam, Kyung-Wan),박재민(Park, Jae-Min) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.2

The purpose of this research is to identify and clarify how middle schoolㆍhigh school fencer’s emotional experience and emotional expressiveness affects the competitive state anxiety. In order to achieve such research purpose, total of 442 middle school’ high school fencers who participated in the ‘12 41st National Men&Women Fencing President’s Cup were selected as the parent population and each player’s data was analyzed by WINDOWS SPSS 18.0 statistics programme with one-way ANOVA, Independent Sample Tr-test, Correlation Analysis, Multiple Regression Analysis and the results are as below. First, it was identified that the positive emotional experience had negative impact on cognitional state anxiety and positive impact on physical state anxiety; negative emotional experience had positive impact on cognitional state anxiety and state confidence. Second, positive emotional expressiveness had negative impact on the physical state anxiety and negative emotional expressiveness had positive impact on the cognitional state anxiety and state confidence; impulsive strength emotional expressiveness had positive impact on the cognitional state anxiety and physical state anxiety.

생활체육 배구동호인들의 상해발생 및 예방에 관한 연구

임승현(Lim Seung-Hyun),고성경(Ko Seong-Kyeong),이종삼(Lee Jong-Sam),전중기(Jun Jung-Gi),이승욱(Lee Seung-Wook) 대구대학교 인문과학연구소 2010 人文科學硏究 Vol.34 No.-

The purpose of this study was provide the effective way of prevention injury and ultimately earlier return to the competition. It was analyzed the frequency and area of injury occurrence during competition period throughout the whole year. The causes and the time of the injury occurrence, and the way of treatment and prevention were examined from total 310 adults recreational volleyball players. Regardless of gender and position differences, it was shown that the highest injury occurrence time was the winter season and Sunday. The major causes of injuries were included that the lack of warm up exercise and the foul committed by the other team's player. As far as the movement is concerned, most if the injuries were occurred during blocking for men's games and receiving for women's game. The injury region of the body was lower extremities, ankle, arm and wrist, and waist by orderly. When the types of the injury were considered, muscle and ligament sprain and tendinitis, joint and bone problems were the major occurred was using airspray types of cataplasm. The education for the preventing of the injury prevention is tendency of increasing, and all players participating for the recreational volleyball games are being endeavored for increase their warm up time before initiate the main games.

이식형 심장 박동 조절 장치용 저 전력 4차 대역통과 Gm-C 필터

임승현(Seunghyun Lim),한건희(Gunhee Han) 대한전자공학회 2009 電子工學會論文誌-SD (Semiconductor and devices) Vol.46 No.1

저 전력 소모는 의료용 이식 장치에서 매우 중요한 요소가 된다. 본 논문에 제안된 이식형 심장 박동 조절기의 감지 단에 필요한 저 전력 4차 Gm-C 필터는 다단 증폭 단으로 구현 되었다. 매우 큰 시상수를 구현 하기 위해서 전류 분할 및 플로팅-게이트 기법이 적용된 OTA가 사용되었다. 측정 결과, 필터는 50 ㏈의 SFDR을 가지며, 1.8 μ,W의 전력이 소모 되었다. 전원 전압은 1.5 V가 공급되었고, 코어는 2.4 ㎜ × 1.3 ㎜ 의 실리콘 면적을 차지한다. 제안된 필터는 1-poly 4-metal 0.35-㎛ CMOS 공정에서 제작 되었다. Low power consumption is crucial for medical implantable devices. A low-power 4th-order band-pass Gm-C filter with distributed gain stage for the sensing stage of the implantable cardiac pacemaker is proposed. For the implementation of large-time constants, a floating-gate operational transconductance amplifier with current division is employed. Experimental results for the filter have shown a SFDR of 50 ㏈. The power consumption is below 1.8 ㎼, the power supply is 1.5 V, and the core area is 2.4 ㎜ × 1.3 ㎜. The filter was fabricated in a 1-poly 4-metal 0.35-㎛ CMOS process.

스포츠센터의 서비스스케이프가 이용자의 서비스품질 만족에 미치는 영향

임승현(Lim, Seung-Hyun),남경완(Nam, Kyung-Wan),최현준(Choi, Hyun-Jun) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.1

The purpose of this study is to analyze the different degree of satisfaction on service quality and how servicescape of the sports center affects the service quality satisfaction. In order to study this, users of 10 sports center in D and K city were recruited. Total of 595 subjects were selected and SPSS 17.0 statistical program was used to perform ANOVA, Independent Sample t-test, Correlation Analysis, and Multiple Regression Analysis to obtain following result First, there is a positive causal relationship between servicescape and service quality satisfaction. Second, their convenience, functionality, surrounding elements, and aesthetic elements related servicescape recognized by the user had positive effect on satisfaction of effective management. Third, there is all sub-factors of servicescape had positive effect on user"s satisfaction on convenience

골프연습장 이용자의 운동몰입이 운동중독과 운동탈진에 미치는 영향

임승현(Seung Hyun Lim),남경완(Kyung Wan Nam),송승욱(Seung Wook Song),김유진(You Jin Kim) 한국사회체육학회 2011 한국사회체육학회지 Vol.0 No.46

This study is to investigate the influence of driving range users` immersion in exercise on exercise addiction and exercise burnout, with a view to understanding the positive side of exercise addiction, suggesting desirable sports activities to driving range users, helping them to enjoy high-quality life, and providing basic information and data necessary to attract driving range users. In line with these objectives, an analysis was made of the data collected from the 305 users of 10 driving ranges located in D-Metropolis and K-Province. The followings show the results. First, it was found that driving range users` immersion in exercise exerted positive influence on all the subitems of the item ``exercise addiction.`` Second, the immersion in exercise, caused by participation in golf, was found to exert positive influence on the item ``personal attainment.`` Third, exercise addiction, caused by participation in golf, exerted positive influence on ``personal attainment``, a subitem of the item ``exercise burnout``, but had negative influence upon the item ``depersonalization.`` In addition, it was found that the addiction to the withdrawal syndrome exerted positive influence on ``depersonalization`` and ``emotional burnout``, the subitems of the item ``exercise burnout.`` As aforesaid, in case driving range users` immersion in golf influences exercise addiction, they may derive sound and desirable sports activities. In case the immersion in golf brings about negative results such as the withdrawal syndrome, depersonalization and emotional burnout may occur and as a result the quality of users` lives may be deteriorated. In conclusion, it is urgent to map out programs in order that users may have positive burnouts related to personal attainment.