MGrid Portal : 분자 시뮬레이션 그리드 포탈

이종현(Lee Jong Hyun0 Kim),김동욱(D.W. Lee),이건영(K.Y. Jeong),정갑주(K.J. Hwang),황선태(S.T. Park),박형우(H.W.) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A

그리드 컴퓨팅은 다양한 이기종 분산 컴퓨팅 환경에서 다양한 소프트웨어들에 대한 설치, 운영, 업그레이드, 유지보수 등이 요구된다. 이러한 환경에서 응용 소프트웨어(특히, 레가시 소프트웨어) 지원은 매우 어려운 작업이다. 웹 포탈 기술은 이러한 문제에 대한 효과적 대안이다. 그러나 웹 포털의 경우 다양한 사용자 인터페이스 제공이 난해하여 긴밀한 사용자와 컴퓨터간 상호작용이 요구되는 응용과학 분야 연구에 적용이 어렵다. MGrid 포탈은 BT/NT분야에서 광범위하게 사용되는 연구기법인 분자 시뮬레이션을 지원하도록 설계된 그리드 포탈 시스템으로 분자 시뮬레이션 작업들에 대한 상세한 모니터링 및 통제 기능을 지원하도록 설계되어 있다.

솔더 나노입자를 사용한 TSV Interconnection 기술

이종현,윤종호,현창용,Lee, Jong-Hyun,Yoon, Jong-Ho,Hyun, Chang-Yong 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.3

저온용 무연솔더 조성 개발의 필요성과 대표 조성의 특성

이종현,강남현,이창우,김정한,Lee, Jong-Hyun,Kang, Nam-Hyun,Lee, Chang-Woo,Kim, Jeong-Han 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.2

전자 패키징 Interconnect 소재로의 카본 나노튜브의 활용

이종현,Lee, Jong-Hyun 한국마이크로전자및패키징학회 2009 마이크로전자 및 패키징학회지 Vol.16 No.3

Carbon nanotube(CNT)s have been considered as one of the most unique materials due to the their superior mechanical, thermal and electrical properties. Therefore, numerous studies have been performed for the utilization of CNTs. This review article focuses on the recent research trends on the utilization of CNTs for new interconnect materials in electronics packaging. Major contents mentioned are the direct interconnection technology using CNTs and the main properties of polymer/CNTs composite materials. This article is aimed at the reviewing of important results from the recent studies and providing the straightforward understanding of the results through the mutual analysis and a industrial viewpoint.

미용전공 여대생과 비전공 여대생의 체형인식, 신체만족도 및 식습관 비교 연구

이종현,김민선,오주환,Lee, Jong-Hyun,Kim, Min-Sun,O, Ju-Hwan 동아시아식생활학회 2007 동아시아식생활학회지 Vol.17 No.4

This study was carried out to investigate perceptions of body image, body satisfaction, and dietary habits of beauty art major and non-major college students in Gyeonggi province. A total of 312 self-administered questionnaires (beauty art majors=145; non-majors=167) were analyzed. The means for height, weight, and BMI were 161.7 cm, 51.4 kg and 19.7, respectively. There were more majors who were underweight according to BMI classification than non-majors. Sixty-six percent of the subjects had previous weight control experience, and there was no significant difference between the majors and non-majors. The mean score for current body image was 4.61 out of a possible 9 points in the majors, which was significantly lower than 4.95 in the non-majors, and their perception of an ideal body image was thinner than their current body image. Those with more weight control experience had currently heavier perceptions of their body. The mean score for body satisfaction was 2.60 out of a possible 5 points, which was lower than the mean score for their attitudes toward the importance of their bodies. The mean score for dietary habits was 2.80 out of a possible 5 points, and there was no significant difference with dietary habits according to weight control experience or BMI classification. In both the majors and non-majors, there was a significant positive correlation between BMI and perception of current body image (p<0.001, p<0.001), and a negative correlation between BMI and body satisfaction (p<0.01, p<0.001). In the major students, there were significant positive correlations between dietary habits and body satisfaction (p<0.01), and attitudes toward the body importance (p<0.05); therefore, the greater their body satisfaction and body importance, the higher their scores for dietary habits.

고등학교 급식 조리종사원의 영양지식과 영양교육 경험과의 관계 연구

이종현,류경,Lee, Jong-Hyun,Ryu, Kyung 동아시아식생활학회 2006 동아시아식생활학회지 Vol.16 No.6

This study was designed to investigate the relationships between nutrition education, nutrition awareness and nutrition knowledge of school food service employees. We analyzed 288 self-administered questionnaires. Most of the employees (89.8%) were with contract-managed food services, 45.1% were $41{\sim}50$ years old, and 45.4% had chef certification. Two-thirds of the employees received nutrition education on 'nutritionally balanced diet' and 'sources of calcium', whereas less than 50% received education on 'problems with carbohydrates', 'functions of iron', 'deficiency and sources of iron'. The degree of nutrition awareness was generally higher than the level of nutrition education experience. The mean nutrition knowledge score was 11.7 out of 20 possible points, The majority of employees correctly identified 'sources of calcium (91.8%)', 'functions of carbohydrates (91.4%)', 'sources of cholesterol (91.0%)', and 'problems with lipids (90.4%)'; less than 50% correctly answered 'sources of proteins (18.9%)', 'functions of iron (27.9%)', 'recommended dietary allowances (32.0%)', 'functions of lipids (40.2%)', and 'sources of vitamins (44.3%)'. A chi-square analysis revealed that the employees' actual knowledge did not differ significantly by nutrition education - with the exception of three topics; 'recommended dietary allowances', 'changes in vitamins during cooking', 'functions of water' - or by their nutrition awareness. Nutrition knowledge scores did not differ by sex, decreased with age, increased with academic background, and increased in careers of >10 years or that were contract managed. There were significant correlations between nutrition education scores and nutrition awareness scores (p<0.001); nutrition knowledge scores and nutrition education scores (p<0.001); nutrition knowledge scores and nutrition awareness scores (p<0.001).

Double Sensor Type 감지장치를 통한 리프트 정지위치 오차누적 개선 방안 제안

이종현,권순욱,박성응,이미나,Lee, Jong-Hyun,Kwon, Soon-Wook,Park, Sung-Ung,Lee, Mi-Na 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.2

The Plan and equipment of vertical lifting are very important in high-rise building construction site, and unmanned lifts usage is increasing for financial and efficient reason. However if lift stop position error occur, It can be accumulated. And the lift can not be available during an engineer fix the problem. So loss of time and cost will occur when lifts have problems. This paper reports an improved lift stop position sensing device for preventing loss of time and cost from lift stop position error. The result of tests showed that the system has a correction function of lift stop position error, and the accuracy of device which was developed in this paper was about 9.75mm better than existing equipment. 초고층 건축물의 수요가 늘어나면서 수직 양중 계획과 장비에 대한 중요성이 증대되고 있으며, 경제적이고 효율적인 리프트 사용을 위하여 무인 리프트의 사용 비중이 늘어나고 있다. 하지만 리프트의 정지위치 에러가 발생하거나 누적되는 경우 작업 효율성이 떨어지고, 문제 해결을 위해 리프트 업체가 리프트를 재 세팅 하는 동안 리프트 사용이 불가하게 되어 공사 진행에 장애가 된다. 본 연구에서는 리프트 정지위치 에러에 의한 시간 및 비용 손실을 방지하기 위해 리프트 정지위치 감지장치를 개발하였다. 실험을 통해, 정지위치 에러 발생 시 이를 보정하는 기능을 검증하였고, 정확도도 약 9.75mm 증가하는 것을 확인하였다.

운행 중인 2-Arch 터널의 피난연결통로 신설을 위한 중앙벽체 굴착에 관한 연구

이종현,Lee, Jong-Hyun 한국재난정보학회 2021 한국재난정보학회 논문집 Vol.17 No.3

연구목적: 기시공되어 현재 운행 중인 2-Arch 터널에 대하여 피난연결통로 신설의 필요성이 대두되고 있다. 이에 본 연구는 중앙벽체 굴착에 따른 터널 및 벽체 거동 분석과 안정성 분석에 목적을 두고 있다. 연구방법: 2-Arch 터널과 피난연결통로의 이론적 배경을 설명하고, 3차원의 유한요소 수치해석을 통하여 터널 및 벽체의 거동을 집중적으로 분석하였다. 다양한 지반 조건을 변수로 하여 암반 등급에 따른 매개변수 해석을 수행하였으며, 중앙벽체의 변위와 응력을 집중적으로 분석하였다. 연구결과: 중앙벽체 굴착 시 개구부 중앙에서 가장 큰 침하량을 보였으며, 응력은 첫 번째 굴착 시 가장 크게 발생하였다. 또한 개구부 양 상단에서 응력집중 현상이 발생함을 알 수 있었으며, 허용응력 개념을 고려한 안정성 검토 결과 허용응력을 초과하는 것으로 나타났다. 결론: 터널의 천단변위는 허용기준치 내로 안정성을 확보하였지만, 발생응력은 허용기준치를 초과하는 것으로 나타나 시공 시 적절한 보강공법을 적용하여 갑작스런 응력 해방에 대한 방지가 필요할 것으로 사료된다. Purpose: There is a need to construct an evacuation passageway for the 2-Arch tunnel, which has been constructed and is in operation. Therefore, it aims to analyze tunnel and center wall behaviour and stability due to excavation of the center wall. Method: We describe the theoretical background of 2-Arch tunnel and evacuation passageway, and focused on analyzing the behaviour of tunnel and wall using 3-dimensional finite element analysis. Parametric analysis according to rock rating was performed with various ground conditions, and the displacement and stress of the center wall were intensively analyzed. Result: With the center wall excavation, the largest amount of settlement was shown in the center of the opening, and the stress was greatest during the first excavation. In addition, it was shown that stress concentration occurred at the top of both openings, and stability reviews considering the concept of allowable stress showed that it exceeded the allowable stress. Conclusion: Although the displacement of the tunnel has secured stability within the allowable standard, the generated stress is found to exceed the allowable standard, so it is necessary to prevent sudden stress release by applying appropriate reinforcement methods during construction.

건설현장 관리자 안전 리더십이 근로자 안전 태도와 행동에 미치는 효과 : 자기 고양 편향을 중심으로

이종현,문광수,Lee, Jong Hyun,Moon, Kwangsu 한국안전학회 2020 한국안전학회지 Vol.35 No.2

This study examined the effects of perceptual differences of safety leadership between managers and workers on workers' safety attitudes and behavior in two construction sites. In addition, the mediating role of safety attitude between safety leadership and safety behavior across discrepancy level of safety leadership. This study was conducted on two first-tier construction companies within the 100th place in 2019. Two companies were similar in size(100 - 150 billion won) and process from the basement frame finishing stage to start of the ground structure of apartment. In A Site, 40 managers and 73 workers, 42 managers and 77 workers in B site participated the survey on managers' safety leadership, and workers' safety attitude and behavior. The results showed that there was no significant difference between the safety leadership scores assessed by the manager and workers at site B. However, the safety leadership scores assessed by the managers were significantly higher than that by the workers at site A. The workers' safety attitudes and behaviors at site B were higher than those of workers at site A. Moreover, Site B was significantly higher in the effects of safety leadership on safety behavior than Site A. At site B, safety leadership had a significant influence on safety behavior even after controlling the safety attitude of workers. At site A, safety leadership had no significant effect on safety behavior after controlling safety attitude. These findings suggest that there is managers' self-serving bias on safety leadership in site A and that this bias of leadership can negatively affect workers' safety attitude and behaviors. In addition, it can be seen that if the self-serving bias on safety leadership occurs, the manager's safety leadership has less influence on workers' safety behavior.

선진 재난안전의식의 활성화를 위한 방안 연구

이종현,김미라,고재철,Lee, Jong-hyun,Kim, Mi-ra,Ko, Jae-chul 한국재난정보학회 2021 한국재난정보학회 논문집 Vol.17 No.3

연구목적: 본 연구에서는 대형재난사고의 주요한 요인으로 지적되는 국민들의 재난안전의식을 활성화 시킬 수 있는 방안을 제시하고자 한다. 연구방법:본 연구에서는 재난관리 및 안전의식에 관한 이론적인 검토를 실시하고, 재난사고의 원인을 도출하기 위해 '재난관리평가 국민안전 체감도의식' 조사 결과 및 대형재난사고 사례들을 분석하여 선진 재난안전의식 활성화 방안을 제시하였다. 연구결과: 재난관리평가 국민안전 체감도 조사를 통해 재난관리 4단계 중 '대응'차원은 잘 수행되고 있으나, '복구'차원이 미흡한 국민들은 인식하고 있었고, 특히 '예방' 차원에서 재난안전에 대한 교육이 매우 부족하다고 느끼고 있었다. 국민 안전의식 조사를 통해서는 대피시설에 대한 인지 수준이 매우 낮았고, 감염병과 붕괴사고에 대한 정보가 부족한 것으로 나타났으며, 특히 일상생활에서의 안전수칙 준수에 대한 인식이 미흡한 것으로 드러났다. 대형재난사고(코로나19, 밀양세종병원 화재, 2004년 동해안 산불)에 대한 사례를 분석한 결과, 안전불감증과 같은 안전의식의 결여가 피해규모의 확대를 유발시킨 주요한 원인임을 도출하였다. 결론:재난사고를 예방·감소시킬 수 있는 가장 근본적인 요소는 선진 재난안전의식의 활성화이며, 이를 제고하기 위한 세 가지 방안을 제시하였다. 먼저, 안전교육 및 안전홍보 활동의 확대를 통한 안전문화운동의 확산이 필요하다. 두 번째로는 재난대응에 대한 실효성을 향상시키기 위해 일반인들을 대상으로 하는 재난대비훈련을 시행해야 한다. 마지막으로 안전에 대한 개개인의 인식 전환이 필요하다. 이러한 요소들이 체계적으로 이루어져야만 선진 재난안전의식이 제고될 수 있을 것이며, 궁극적으로 우리 사회의 재난사고들이 감소될 수 있을 것이다. Purpose: The purpose of this study is to create the deveopment plan for promotion of advanced disaster-safety awareness, which is noted as a major factor in the large disaster. Method: This study is to conduct theoretical review with regard to disaster management and safety awareness. Consciousness surveys on safety awareness and previous disaster case was analyzed to derive the cause of the disaster, and the development plan for promotion of advanced disaster-safety awareness was suggested. Result: In the survey on the public's sense of safety on the disaster management evaluation, 'Response' stage was well performed, but the 'Recovery' stage was not. Especially, it was found that disaster safety education at the 'Prevention' stage was very lacking. In the survey on the public's safety awareness, the awareness level of the evacuation facility was very low, information on infectious diseases and collapse accident was insufficient. Especially, it has been found that the awareness on safety regulation in daily life is very insufficient. Through the case study on previous disaster(COVID-19, Fire in Miryang Sejong Hospital, Forest fire in the east coas at 2004'), it was derived that the lack of safety awareness(such as safety insensitivity) was the main factor of the expansion of the damage scale. Conclusion: The development plan for promotion of advanced disaster-safety awareness are as follow. First, it is necessary to spread the safety culture movement through the expansion of safety education and safety promotion. Second, disaster confrontation training for the public should be implemented to improve the effectiveness of disaster response. Finally, it is necessary to change the individual awareness on safety. When these factors are implemented systematically, advanced disaster-safety awareness can be promoted. Ultimately, disaster accidents in our society can be reduced.