시효 처리에 의한 42Sn-58Bi 솔더와 무전해 Ni-P/치환 Au UBM 간의 계면 반응

조문기,이혁모,부성운,김태규,Cho Moon Gi,Lee Hyuck Mo,Booh Seong Woon,Kim Tae-Gyu 한국마이크로전자및패키징학회 2005 마이크로전자 및 패키징학회지 Vol.12 No.2

42Sn-58Bi 솔더(이하 wt.$\%$에 의한 표기)와 무전해 Ni-P/치환 Au under bump metallurgy (UBM) 간의 계면 반응을 intermetallic compound (IMC)의 형성과 성장, UBM의 감소, 그리고 범프 전단강도의 영향 관점에서 시효 처리 전 후에 어떠한 변화가 생기는 지를 알아보고자 하였다. 치환 Au 층을 $5{\mu}m$ 두께의 무전해 Ni-P ($14{\~}15 at.\%$ P)위에 세 가지 각기 다른 두께, 즉 $0{\mu}m$(순수한 무전해 Ni-P UBM), $0.1{\mu}m$, $1{\mu}m$로 도금하였다. 그 후 42Sn-58Bi 솔더 범프를 세 가지 다른 UBM 구조에 스크린프린팅 방식으로 형성하였다. 범프 형성 직후에는 세 가지 다른 UBM구조에서 솔더와 UBM 사이에 공통적으로 $Ni_3Sn_4$ IMC (IMC1) 만이 형성됐다. 하지만, 이를 $125^{\circ}C$에서 시효 처리를 할 경우 특이하게 Au를 함유한 UBM 구조에서는 $Ni_3Sn_4$ 위로 또 다른 4원계 화합물 (IMC2)이 관찰되었다. 원자 비로 $Sn_{77}Ni{15}Bi_6Au_2$인 4원계 화합물로 확인되었다. $Sn_{77}Ni{15}Bi_6Au_2$ 층은 솔더 조인트의 접합성에 매우 치명적인 영향을 미쳤다. 시효 처리를 거친 Au를 함유한 UBM 구조에서 솔더 범프의 전단 강도 값은 시효 처리 전에 비해 $40\%$ 이상의 감소를 보였다. The interfacial reaction between 42Sn-58Bi solder (in wt.$\%$ unless specified otherwise) and electroless Ni-P/immersion Au has been investigated before and after thermal aging, with a focus on formation and growth of an intermetallic compound (IMC) layer, consumption of under bump metallurgy (UBM), and bump shear strength. The immersion Au layer with thicknesses of 0 (bare Ni), 0.1, and $1{\mu}m$ was plated on the $5{\mu}m$ thick electroless Ni-P ($14{\~}15 at.\%$P) layer. Then, the 42Sn-58Bi solder balls were fabricated on three different UBM structures by screen-printing and pre-reflow. The $Ni_3Sn_4$ layer (IMC1) was formed at the joint interface after pre-reflow for all the three UBM structures. On aging at $125^{\circ}C$, a quaternary phase (IMC2) was observed above the $Ni_3Sn_4$ layer in the Au-containing UBM structures, which was identified as $Sn_{77}Ni{15}Bi_6Au_2$ (in at.$\%$). The thick $Sn_{77}Ni{15}Bi_6Au_2$ layer deteriorated the integrity of the solder joint and the shear strength of the solder bump was decreased by about $40\%$ compared with non-aged joints.

일제강점기 경파(鏡波) 한진희(韓軫熙)의 유도활동과 사상에 관한 연구

조문기(Moon Gi Cho),임석원(Suk Won Yim) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.48

The purpose of this study is to understand the contributor of korean judo by studying of Han, Jin-Hee`s Judo activity and thought, who was founder of Chosun-Gangmuguan(朝鮮講武館). This study covers his Judo activity and thought. The methods of this study are uses of newspapers, magazines and books. The result of this research is as follow. First, Han, jin-hee having a judo and swimming training was a lot of effort. Second, Han, jin-hee idea for an independent is that need a strong body and mind. Accordingly, Han, Jin-Hee was a truly great Judo-master.

비드를 이용한 내시경용 연속봉합기구

조문기(Moon Ki Cho),이창양(Chang Yang Lee),홍대희(Daehie Hong),전훈재(Hoon Jai Chun),이규백(Kyu Back Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월

This paper deals with the designing of instrument for achieving surgical operation in the stomach and gullet using endoscope channel. The method used herein was to provide beads to knot suturing thread automatically. Following design rules were applied : 1) that instrument must be designed to enable surgical operator to stitch successively by only simple handling 2) that instrument must be designed to minimize insertion and extraction of endoscope. The main result from the experiment with animal stomach was that the surgical operation time was reduced and successive suture was available. Considering the requirement of operator’s highly trained skills and the discomfort of patient in traditional suture process, the proposed design is expected to markedly improve the endoscopic suturing performance.

2008년 베이징 올림픽 슬로건("ONE WORLD ONE DREAM")의 중화민족주의적 성격에 관한 연구

조문기(Moon Gi Cho) 한국사회체육학회 2007 한국사회체육학회지 Vol.0 No.31

This study is aimed at finding out a real intent to open Olympics, based on the result of analyzing the historical and philosophical meaning of Beijing Olympics, and of illuminating the background of creation of ``One world One dream,`` attempting to consider character of Chinese nationalism involved in the slogan of Beijing Olympics ("One world One dream"). In order to do it, this study analyzed the historical development process and feature of Chinese nationalism, along with the historical and philosophical meaning of Beijing Olympics based on the ideological background of Chinese nationalism, found out the Olympics` performances desired by Chinese government and its political function, and followed up the creation background of the slogan "One world One dream" and its internal and external meaning. The findings of the study procedure are as follows. 2008 Beijing Olympics` slogan "One world One dream," containing the superficial message of the Chinese to devote themselves to realize ``One Earth`` that is a global desire, is made based on the Chinese national policies, first, pluralism and unification, second, short-term coexistence, long-term fusion, third, holding big thing and letting small thing go. The foregoing policies are expressed by a type of Chinese nationalism, being involved in "One world One dream," the slogan of 2008 Beijing Olympics, and also symbolizing and implying Chinese national policy.

반복학습을 이용한 회분식 반응기의 제어

조문기(Moon Gi Cho),방성호(Sung Ho Bang),조진원(Jin Won Cho),이광순(Kwang Soon Lee) 제어로봇시스템학회 1991 제어로봇시스템학회 국내학술대회 논문집 Vol.1 No.1

中國東北 抗日戰爭에서의 韓民族의 역할과 그 歷史的 地位

曹文奇(Cho Mun-gi) 한림대학교 아시아문화연구소 1997 아시아문화 Vol.- No.13

재무분석가의 활동이 이익의 질과 자본비용에 미치는 영향

조문기(Cho, Mun-Kee),최동춘(Choi, Dong-Choon) 글로벌경영학회 2013 글로벌경영학회지 Vol.10 No.1

본 연구는 재무분석가들의 활동이 기업의 감시기능을 강화함으로써 회계이익의 질을 향상시키고 자본비용을 감소시키는지를 실증적으로 분석하였다. 재무분석가의 기능 중 하나인 감시기능이 원활히 수행될 수 있다면 경영자의 재량적 의사결정을 제한함으로써 회계이익의 질이 향상될 것이며, 회계이익의 질의 향상은 자본비용을 감소시키게 될 것이다. 실증분석을 위하여 2005년부터 2010년까지 유가증권시장에 상장된 제조기업을 대상으로 하였 으며, 재무분석가의 활동과 회계이익의 질을 검증하기 위해 1,529개, 재무분석가의 활동과 자본비용 간의 관계를 검증하기 위해 698개의 표본이 이용되었다. 재무분석가의 활동은 선행연구에 따라 이익예측에 관한 정보를 제공하는 재무분석가의 수로 측정하였으며, 회계이익의 질은 재량적 발생액의 잔차와 표준편차를 이용하였다. 다음으로 자본비용은 GM 모형, MPEG 모형, PEG 모형에 의해 측정하였다. 실증분석 결과는 다음과 같다. 첫째, 예상대로 재무분석가의 활동은 재량적 발생액의 잔차와 표준편차를 감소시키고 있는 것으로 나타났다. 이러한 결과는 재무분석가의 활동이 회계이익의 질을 향상시키고 있음을 보여주는 결과이다. 둘째, 재무분석가의 활동은 자본비용을 감소시키고 있는 것으로 나타났다. 이러한 결과를 종합하여 볼 때, 재무분석가는 기업의 효과적인 외부감시주체 로서의 기능을 수행함으로써 회계이익의 질의 향상과 자본비용의 감소에 기여하고 있음을 의미한 다. 본 연구는 재무분석가의 활동과 회계이익의 질 간의 관계뿐만 아니라 자본비용 간의 관계도 검증하였다는 점에서 의의를 갖는다. This paper examined whether the activities of analysts would improve the quality of accounting earnings and reduce the cost of capital by strengthening the monitoring function of firms. The main research hypothesis of this paper is that when(if) the monitoring function, which is the one of functions of analysts, would perform properly, then the quality of accounting would be improved by limiting the discretion of the managers and the improvement of earnings quality would reduce the cost of capital. The empirical analysis samples consist of firms which were listed in the Korean Stock Change(Market) from 2005 to 2010. The 1,529 samples were used to analyze the relation between th activities of analysts and the earnings quality and the 698 samples were used to analyze the relation between the activities of analysts and the cost of capital. The analysts’ activity was measured by number of analysts according to research method of previous studies and the cost of capital was measured by using the models of GM, MPEG, PEG. The empirical results of this paper are as follows. First, as like expectation, the activities of analysts reduced the residuals and the standard deviation of discretionary accruals and this result means that the activities of analysts improved the quality of accounting earnings. Second, the relation between the activities of analysts and the cost of capital have statistically a significant negative relation and this result means that the activities of analysts reduced the cost of capital. In summary, the empirical results indicate that the activities of analysts improved the earnings quality and reduced the cost of capital and the main contribution of this paper is to present that the activities of analysts decreased the cost of capital.

노인요양정보의 공표에 관한 연구 - 일본 개호보험초기(2000년대 초기) 문헌을 중심으로 -

조문기(Cho, Moun-Gi) 동북아시아문화학회 2019 동북아시아문화학회 국제학술대회 발표자료집 Vol.2019 No.10

The importance of disclosure of information in the nursing care insurance system is a new system that is being provided by plural supply. There is a need for a reasonable choice of the user for care services. In March 2001, Japan promoted the information disclosure IT by e-government focusing on e-government. However, the information of nursing care insurance, which was excluded from the generalization of IT at the time, could not be found in the disclosure of informatization. The purpose of this study is to clarify the data on the process of publicizing Japan’s information insurance system. First, review the preceding research on Japanese medical care information and find out the meaning of the nursing care insurance system. Second, it examines the relationship between the information disclosure of nursing care insurance, IT utilization, and the nursing care insurance system. Third, we propose the information disclosure frame of long-term care insurance and long-term care insurance in Korea.

사전학습 어댑터를 사용한 평생 언어 학습

조문기(Moon-Gi Cho),박경문(Gyeong-Moon Park) 한국정보과학회 2022 한국정보과학회 학술발표논문집 Vol.2022 No.06

탄소 중립 공정 에너지 절감을 위한 스마트 플랜트 플랫폼

조문기(Moon-Ki Cho) 한국에너지기후변화학회 2022 한국에너지기후변화학회 학술대회 Vol.2022 No.5