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

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

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.

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).

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.

흰쥐를 이용한 실험적 맥락막신생혈관 모델에서 유리체강내 양막 주입의 효과

이종현,정재림,홍사민,고형준,Jong Hyun Lee,Jae Lim Chung,Samin Hong,Hyoung Jun Koh 대한안과학회 2008 대한안과학회지 Vol.49 No.7

Purpose: To evaluate the effects of an intravitreal amniotic membrane (AM) injection on a rat model of laser-induced choroidal neovascularization (CNV). Methods: Intravitreal injection of AM (12.5 µg/mL) into the left eyes and phosphate-buffered saline into the fellow eyes of 15 rats was performed immediately after laser injury. At week 2, after angiography, the rats were sacrificed, and histopathologic analysis was performed. Angiographic and histopathologic assessments of the effects of AM injection on CNV growth were compared between the two groups. Results: CNV thickness was found to have increased more in the AM treatment group (141.54±8.12 µm) than in the experimental control group (65.23±16.90 µm) (p=0.010). Conclusions: Intravitreal AM injection demonstrated histopathologic pro-angiogenic properties in a rat model of CNV. J Korean Ophthalmol Soc 49(7):1154-1158, 2008

타이어-휠가드 공간의 음장모드와 고주파성 로드노이즈의 상관성 연구

이종현,구요천,이진모,Lee, Jong Hyun,Ku, Yo Cheon,Lee, Jin Mo 한국음향학회 2016 韓國音響學會誌 Vol.35 No.4

타이어와 휠가드 사이의 공간은 타이어 패턴음의 전달경로가 된다. 본 논문에서는 타이어-휠가드 공간에서 발생하는 음향현상을 음장모드 분석과 휠 가드 표면에서 음압분포 가시화를 통해 규명하였다. 타이어 패턴음 저감을 위해 음향학적 댐퍼 역할을 수행하는 캐비티를 휠가드 표면상에 적용하였다. 실내소음은 2 dB(A) 감소하였는데, 본 연구에서 다룬 소음저감방법은 완성차 단계에서 원가/중량의 증가없이 실내음질을 개선하는 효과적인 방안이 될 것이라고 판단된다. The space between tire and wheel guard acts as a path for tire pattern noise transmission. In this study, acoustic phenomenon occurring in the tire-wheel guard space is investigated using acoustic mode analysis and visualization of the sound pressure distribution over the wheel guard surface. We introduced a cavity over the wheel guard surface to reduce the tire pattern noise, where the cavity acts as an acoustic damper. The interior noise was reduced by 2 dB(A), and the noise control measures treated in this study may provide an efficient method to improve interior sound quality without increasing cost and weight at the final stage of the vehicle development.

공간패널모형을 이용한 국내 초미세먼지 농도에 대한 분석

이종현,김영민,김용구,Lee, Jong Hyun,Kim, Young Min,Kim, Yongku 한국데이터정보과학회 2017 한국데이터정보과학회지 Vol.28 No.3

초미세먼지 (particulate matter 2.5, $PM_{2.5}$)는 분진의 입경이 2.5 이하의 보다 작은 크기의 미세한 입자들을 말하는데, 미세먼지와 달리 대기 중에서 제거가 어렵고 기도나 코 점막에서 걸러지지 않으며, 호흡 시 폐포까지 직접 침투하기 때문에 장기간 노출될 경우, 폐 기능 감소, COPD (chronic obstructive pulmonary disease) 증가, 폐암 발생증가가 있다고 알려져 있다. 현재 국내외에서 초미세먼지에 대해 다양한 연구가 이루어지고 있는데, 초미세먼지의 농도는 기상인자 (풍속, 강우량, 일사량 등)에 영향을 받는 것으로 알려져 있으며, 이산화질소, 오존, 이산화황, 미세먼지 등 대기물질의 농도에도 영향을 받는 것으로 알려져 있다. 특히 우리나라는 점차 증가하고 있는 자동차 수나 오염원으로 인한 초미세먼지외에도 중국으로부터 유입되는 초미세먼지 또한 고려되어야 하는 대상이므로 기상인자 중 풍향과 풍속 또한 어느 정도 큰 영향을 미칠 것으로 판단되며 인접 지역에 대한 영양 또한 고려되어야 할 것이다. 본 연구에서는 초미세먼지 농도에 영향을 미치는 유의한 대기물질 및 기상자료와 초미세먼지 농도의 지역적 특성을 고려한 공간자기상관 행렬에 기초한 공간패널모형을 소개하였고 이를 서울 25개 구에서 관측된 초미세먼지 자료에 적용하였다. 또한 초미세먼지와 대기오염물질의 농도를 통해 서울시에서 발생한 호흡기 질환 환자 수를 분석하여 그의 위해성을 확인하였다. It is well known that the air quality of 92% of the world is known to exceed the standard of WTO and the death caused by air pollution is almost 6 million per year. The $PM_{2.5}$ concentration in Korea is the second most serious among the OECD countries following Turkey. Since the $PM_{2.5}$ has a direct effect on the respiratory system, it has been actively studied in domestic and foreign countries. But current research on the $PM_{2.5}$ is limited in weather factor or air pollutants. In this paper, we consider the influence of spatial neighbor with weather factor or air pollutants using spatial panel model. We applied the proposed method to 25 borough of Seoul in Korea. The result shows a significant effect of spatial neighbor on the $PM_{2.5}$ concentration fields.

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.

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.