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Sn-4.0wt%Ag-0.5wt%Cu 솔더 접합계면의 강도특성과 미세파괴거동에 대한 In-situ관찰
이경근,최은근,추용호,김진수,이병수,안행근,Lee, Kyung-Keun,Choi, Eun-Geun,Chu, Yong-Ho,Kim, Jin-Soo,Lee, Byung-Soo,Ahn, Haeng-Keun 한국재료학회 2008 한국재료학회지 Vol.18 No.1
The micro-structural changes, strength characteristics, and micro-fractural behaviors at the joint interface between a Sn-4.0wt%Ag-0.5wt%Cu solder ball and UBM treated by isothermal aging are reported. From the reflow process for the joint interface, a small amount of intermetallic compound was formed. With an increase in the isothermal aging time, the type and amount of the intermetallic compound changed. The interface without an isothermal treatment showed a ductile fracture. However, with an increase in the aging time, a brittle fracture occurred on the interface due mainly to the increase in the size of the intermetallic compounds and voids. As a result, a drastic degradation in the shear strength was observed. From a microshear test by a scanning electron microscope, the generation of micro-cracks was initiated from the voids at the joint interface. They propagated along the same interface, resulting in coalescence with neighboring cracks into larger cracks. With an increase in the aging time, the generation of the micro-structural cracks was enhanced and the degree of propagation also accelerated.
15세 여아에서 발생한 췌장의 비기능성 신경내분비종양 - 1예 보고 -
이경근,박진영,Lee, Kyung-Keun,Park, Jin-Young 대한소아외과학회 2009 소아외과 Vol.15 No.2
We report a case of nonfunctioning neuroendocrine tumor of the pancreas in a 15-year-old girl who presented with back pain. On physical examination, there was mild tenderness in the left upper quadrant of the abdomen. The patient had no pancreatic hormone-associated symptoms. An abdominal ultrasonography showed a well-demarcated hypervascular solid mass with calcification in the tail of the pancreas. An abdominal computed tomography scan showed a $6{\times}5cm$ sized well-encapsulated enhancing solid mass with cystic component in the tail of the pancreas. Distal pancreatectomy was performed. Pathology revealed awelldifferentiated nonfunctioning low grade malignant neuroendocrine tumor of the pancreas. The postoperative course was uneventful.
Aumann-Sharpley 가격에 의한 공통 제조원가의 배분 - 상대적 이익 기여도를 중심으로-
이경근,Lee, Kyung-Keun 대한산업공학회 1989 산업공학 Vol.2 No.2
We study the joint cost allocation based on the book profit producing power of the output through the A-S price mechanism. We show what part of the A-S book profit is allocated to the joint cost and what part is allocated to the variable total book profit of the short-run book profit function. Also we compare some other classical joint cost allocation methods with this A-S price method.
이경근(Kyung Keun Lee),윤영철(Young Chul Youn),황정기(Jung Ki Hwang),박정현(Jung Hyun Park),김지일(Ji Il Kim),유영경(Yung Kyung Yoo),문인성(In Sung Moon),김동구(Dong Goo Kim) 한국간담췌외과학회 2009 한국간담췌외과학회지 Vol.13 No.3
Purpose : The purpose of this study was to evaluate the possibility of expanding the indication for living donor live transplantation (LDLT) for treatment of hepatocellular carcinoma(HCC), beyond the Milan criteria without compromising patient survival. Methods : This was a retrospective study of 5patients (36.4%) that had undergone LDLT, beyond the Milan criteria, among 143 patients with HCC. The study was conducted in aptients treated by the Department of Surgery, Catholic University of orea from Oct 2000 to May 2008. We evaluated the survival curve, prognostic factors for survival and compared survival between our new criteria and Milan criteria. Results : The 5 year patient survival and disease free survival rate in patients treated with LDLT beyond the Milan criteria were 50.2% and 61.9%, respectively. The prognostic factors affecting disease free survival and patient survival included serum AFP level, tumor size, vascular invasion, and lumor cell differentation on univariate analysis. In multivariate analysis, AFP (200 ng/mL), tumor size (7cm) and vascular invasion had significant influence on survival and disease free survival. According to our new criteria (size<7 cm, AFP <200 ng/mL), 88.1% of our patients were included compare to the 63.6% that would have been if limited to the Milan criteria. With both factors met, the survival was comparable to the survival of Milan criteria (63.7% on our criteria and 78.2% on Milan criteria at 5 years)(P=0.103). Conclusion : A tumor size <7cm and a AFP <200 ng/mL appear to be useful cut-off values, beyond that criteria required by Milan. An analysis according to our criteria showed an acceptable survival outcome. Further verification of these findings by a large volume or prospective study is required for widespread adoption of our new criteria.
공동 납품의 배송 경로 선택과 이익 공헌도에 의한 공통 이익의 배분
이경근 ( Kyung Keun Lee ),류시욱 ( Si Wook Ryu ) 대한설비관리학회 2012 대한설비관리학회지 Vol.17 No.4
Multiple suppliers can reduce the total of inventory related cost and delivery cost by cooperating their delivery schedules to a large end-user such as an auto assembly manufacturer or a big department store. In this study, two important decisions are investigated; the first one is how to decide their delivery schedules to minimize the their cooperative total cost, and the next one is allocation of the reduced cost (joint profit) to each supplier by his contribution to joint profit. A mathematical model is developed to find the delivery schedules and the common period of delivery. Moreover, the contribution to joint profit is decided by the Shapley value which is one way to distribute the joint profit to the suppliers, assuming that they all collaborate. A numerical example about allocation of the reduced cost to each supplier is presented at last.