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성효정 ( Hyo Jeong Seong ),한금수 ( Keum Soo Han ),김주현 ( Ju Hyun Kim ) 대한산부인과학회 2008 Obstetrics & Gynecology Science Vol.51 No.2
Abdominal pregnancies are a small fraction of ectopic pregnancies. They usually implant on the pelvic cavity after disruption of the initial implantation site in the tubes, but they have been reported from all over the peritoneal cavity. In this case, the conceptus was implanted in the inferior-posterior area of the right hepatic lobe. Surgical resection of a hepatic pregnancy may result in massive and even fatal hemorrhage. We report a case of hepatic pregnancy that had successful resolution by systemic intramuscular methotrexate injection only.
5-Head Router Machine용 2면 구속 공구시스템 설계를 위한 선행 연구
백효정(Hyo Jeong Baek),옥주선(Ju-Seon Oak),최운집(Un-Jip Choi),성승학(Seung Hak Seong) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
As part of development of the 5-head router machine, design of a tooling system has been studied. As a preliminary study, various types of tool holding systems are investigated and analysed. The machine under development is designed to pursue high productivity and high precision. As a result, it requires multiple heads and high speed spindle. For the high speed design, it is important to prevent an elastic deformation by the high speed, which may be significant at the end of spindle. The deformation causes inaccurate fitting and vibrations which directly affect the precision of machining and overall performance of the machine. For the high speed design the two-face-contact tooling system such as HSK type is considered. A BT type which has one-face contact and been traditionally used is compared with the HSK type by numerical calculations of the deformation. It is found the two-face-contact system has better performance with respect to the reduction of deformation. Also important design factors to improve performance of tool holder are identified which include clamping force, contact area, taper angle etc.
항공기 박판부품의 멤브레인 제거장치의 구조해석과 성능평가
성승학(Seung Hak Seong),이득우(Deug Woo Lee),백효정(Hyo Jeong Baek),최운집(Un Jip Choi),정원재(Won Jae Jeong) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
This paper is on the development of a new machine for removing membranes and deburring which is exclusively designed for aircraft frame components of slender shape. The machine has been developed from innovative ideas at the early stage of concept design and modifications through a series of design changes. Some structural analysis results for the development and test results for the performance evaluation are reported. Some technical difficulties such as on fixtures caused by the particular configuration that is thin layer shape of long slender body are also discussed.