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Joule열이 Sn-3.5Ag 플립칩 솔더범프의 Electromigration 거동에 미치는 영향
이장희,양승택,서민석,정관호,변광유,박영배,Lee, Jang-Hee,Yang, Seung-Taek,Suh, Min-Suk,Chung, Qwan-Ho,Byun, Kwang-Yoo,Park, Young-Bae 한국재료학회 2007 한국재료학회지 Vol.17 No.2
Electromigration characteristics of Sn-3.5Ag flip chip solder bump were analyzed using flip chip packages which consisted of Si chip substrate and electroplated Cu under bump metallurgy. Electromigration test temperatures and current densities peformed were $140{\sim}175^{\circ}C\;and\;6{\sim}9{\times}10^4A/cm^2$ respectively. Mean time to failure of solder bump decreased as the temperature and current density increased. The activation energy and current density exponent were found to be 1.63 eV and 4.6, respectively. The activation energy and current density exponent have very high value because of high Joule heating. Evolution of Cu-Sn intermetallic compound was also investigated with respect to current density conditions.
이장희 ( Jang Hee Lee ) 안암법학회 2015 안암 법학 Vol.0 No.46
Despite the historical aspirations for national unification, there are much of problems on the road to unification. Many experts predict that most of all, the problem of economic gap and difference between North and South Korea would be significant obstacle for unification. In this context, "unification policy for global Korean community" which has been presented by the government of South Korea since 1989 has proposed a gradual and phased unification process, the centerpiece of which has been the economic integration. This policy is based on realistic recognition. In particular, the 2000 summit between South and North reached a common understanding of the ways of the Confederation(of Korean Commonwealth). When we distinguish a substantive unification from a formal unification, the integration of economic community appertains to the substance of unification as one of significant challenges of the unified constitution. Without the integration of economic community, a formal unification would be unfinished as well as a substantive unification. Based upon these facts, this paper discusses the constitutional legal basis and meaning of the integration of economic community. First, the constitutional meaning of the integration of economic community is that the people in the Korean Peninsula determine and justify the law and order of the Unified Korea for themselves as the subjects of their own lives who live in one economic community as well as the sovereigns of establishing the unified constitution. Furthermore, it could be interpreted that a phased approach to the unification considering the integration of economic community in itself follows from the article 4 of the constitution which prescribes that "The Republic of Korea shall seek unification and shall formulate and carry out a policy of peaceful unification based on the basic free and democratic order." In the result, the integration of economic community of South and North is an essential process to the peaceful unification based on the basic free and democratic order, and a way to obtain democratic legitimacy in the process of unification and the establishment of the unified constitution as well.
실천공학 교육 방법론 : SOFM신경망과 C4.5를 활용한 강의품질 개선
이장희 ( Jang Hee Lee ) 한국실천공학교육학회 2014 실천공학교육논문지 Vol.6 No.2
대학, 기업 및 학원에서 제공하는 교육 서비스의 질을 향상하기 위해서는 주요 활동인 강의의 품질 개선이 필수적이다. 강의 수행 후 수강생에 의해서 평가되는 강의평가 설문 데이터는 강의 품질을 측정하고 개선할 수 있는 좋은 도구로서, 대부분 간단한 통계분석을 통해 처리되고 있다. 본 연구는 강의평가 설문 데이터를 SOFM (Self-Organizing Feature Map) 신경망과 C4.5와 같은 분석도구를 사용하여 분석함으로써 수강생의 만족도와 강의 성과 관련한 특징을 보다 정확하게 파악하고 개선이 필요한 강의 품질 요소를 구체적으로 도출하여 강의 품질을 효율적으로 개선할 수 있는 방안을 제시하였다. 본 연구에서 제시한 방안을 국내 기업의 사내 강의에 적용한 결과, 만족도와 강의 성과 관점에서 미흡한 3개의 수강생 그룹에서 개선이 필요한 총 강의시간, 강의 자료, 강의 시간표 구성 요소를 개선하여 강의 품질이 향상되는 것을 확인하였다. Improving lecture quality is very necessary for the service quality of education in universities, enterprises and education institutes. The student lecture evaluation survey data is a good tool for measuring lecture quality and have been often analyzed by simple statistical methods. This study presents an intelligent lecture quality improvement method that can improve student’s overall satisfaction and performance by analyzing student lecture evaluation survey data. The method uses SOFM (Self-Organizing Feature Map) neural network and C4.5 to find the patterns in student’s satisfaction and performance more correctly and then decide what to change in the lecture for the improvement of student’s satisfaction and performance. We apply the proposed method to an enterprise lecture in Korea. We can find that it can improve the quality of an enterprise lecture by changing total lecture time, lecture material and organization of lecture schedule to be necessary improvements.
이장희(Jang Hee Lee),이상용(Sang Yong Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
In conventional diesel fuel injection systems, theoretically, the closing pressure for the needle valve is lower than opening pressure since the areas to which the hydraulic pressure applies are designed to be different. And in practice, the closing pressure appears to be even lower than the thoretical value due to mechanical friction between the needle and the nozzle body and also due to the inertia of the needle itself. Therfore, atomization performance appears to be poor especially at the final stage of injection. One way to overcome this problem is to set the opening pressure of the needle valve to the higher value by adjsuting the valve spring and accordingly, the closing pressure would increase. In the present study, a series of experiments have been performed to examine the atomization characteristics at the final stage of injection with the change of the opening(closing) and the back pressures using photographic method. The atomization performance at the final stage was not prominently improved when the opening pressure is increased due to the after-injection of the fuel(by bouncing of the needle) and also due to the dripping of the remaining fuel withinthe the sac volume<br/>
제주의 창작공간과 장소 특정적 미술 - 장소특정적 미술에서 공동체 특징을 중심으로-
이장희(Lee, Jang-Hee) 한국조형디자인학회 2017 조형디자인연구 Vol.20 No.4
최근 몇 년 사이 제주도에 예술인이 급격히 증가하면서 제주예술계는 큰 변화가 일어나고 있다. 특히 2011년을 기점으로 지난 6년 동안 이주 예술가들가 조성한 예술공간이 급격하게 늘어났 다. 자생적으로 조성된 공간과 함께 최근에 정부의 지원사업이 더해지면서 지난 6년간 50여 개가 넘는 예술공간이 새롭게 신설되었다. 제주도의 ‘문화예술의 섬 조성’ 정책은 제주의 창작 및 예술 공간이 늘어나는데, 중요한 역할을 했다. 본 연구는 2013년부터 제주문화예술재단과 제주시에서 지원받은 창작공간을 중심으로 조사해왔다. 연구방법은 직접방문 인터뷰를 기본으로 했고, 문헌이나 기사 등 자료를 수집하여 분석했다. 본연구자는 이 연구를 통해서 제주 창작공간 가운데 ‘장소 특정적 미술’에서 지역의 정체성과 지역민들의 참여를 이끌어내는 공동체적 특성을 갖고 있는 사례를 찾아보고, 이를 통해서 제주라는 지역의 정체성을 고려한 창작공간의 방향성을 찾고자 한다. With the rapidly growing numbers of immigrators, Jeju island is undergoing the dramatic changes on its art ecology. Art community of Jeju island is also anticipating the further transformation of the island’s art society as the growing numbers of the artists moving in. Especially, the continuous growth of newly formed (government subsidized or privately funded) art spaces built by those moved- in-artists since 2011 backs up the anticipation. For the past 6years, more than 50 art spaces have been newly built and there is high possibility of the further growth in those number. Also, Jeju island’s provincial government is taking the positive attitude toward those artistic immigrators’ with the ambitious vision of fostering the island as the ‘Island of art and culture’. And art spaces are expected to play the important role on satisfying the government’s ambition. The study has been investigating the Jeju Culture and Arts Foundation and the creative spaces supported by the city since 2013. Research methods were based on face-to-face interview, and data such as literature and articles were collected and analyzed. This study is to find examples of communal characteristics in the site-specific art in the Jeju s creative spaces. Through this study, we will find the direction of creative spaces considering the identity of Cheju Island.