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- 저자 : 정승원(S.W. Jeong) (검색결과 61 건)
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중공 장축 대두 실린더 제조를 위한 슬라이딩 금형 단조 공법의 개념설계
정승원(S. W. Jeong),장성민(S. M. Jang),문호근(H. K. Moon),전만수(M. S. Joun) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
In this paper, a new forging process with a controlled sliding die is proposed to fabricate a long hollow cylinder with large head. The conceptual design is given. In the process, an end of seamless pipe of initial material is partially heated. A sliding die is used to prevent the heated region of the material from being buckled and its velocity is controlled to exert forming load upward in the early stroke and downward in the remaining stroke on the material. Finite element predictions of the conceptual design are given, indicating that the metal flows are sound even if the thickness and height of the head is very large compared to the thickness of the cylinder.
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간외 전이로 처음 발견된 간세포암종 골 전이로 발견된 간세포암
강은정 ( E. J. Kang ),정승원 ( S. W. Jeong ),장재영 ( J. Y. Jang ),이세환 ( S. H. Lee ),김상균 ( S. G. Kim ),천영국 ( Y. K. Chun ),김영석 ( Y. S. Kim ),조영덕 ( Y. D. Cho ),김홍수 ( H. S. Kim ),김부성 ( B. S. Kim ) 대한간암학회 2010 대한간암학회지 Vol.10 No.-
Hepatocellular carcinoma (HCC) is the fifth most common cancer worldwide in terms of incidence. The majority of tumors are diagnosed when advanced. The long-term prognosis of HCC remains poor, with a 5-year survival rate of <5%. However, recent progress in the treatment of HCC has made it possible for the patient to survive longer, and as a result, distant metastasis from HCC, including bone metastasis has increased and attracted more attention than before. Of the various metastatic sites, the most common site is the lungs, followed by the lymph nodes and bone. The most frequent sites of bone metastasis are the spine, pelvis and rib in that order. Single bone lesion was associated with a favorable outcome, while multiple bone lesions may be associated with severe pain and increasing rate of leucopenia, anemia, and thrombocytopenia, sometimes making radiotherapy administration difficult. The incidence of bone metastasis in HCC is low. Moreover HCC diagnosed with bone metastasis is very rare. We report a patient who present with bone metastasis before the diagnosis of a primary cancer.
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정승원(S. W. Jeong),이성원(S. W. Lee),정완진(W. J. Chung),전만수(M. S. Joun) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
In this paper, a reaction-to-die penetration scheme is presented to deal with the force prescribed dies such as the binders in sheet forming or plate forging, the guide plate and counter punch in fine blanking and the spring attached die and back pressing die in forging. A holding force die is employed to define the region where the force is exerted. In the scheme, the holding force is exerted in the material surface in terms of traction which is calculated by a function of penetration depth of material into the die. The scheme is applied to a fine blanking process using a rigid-plastic finite element method. The traction can be regarded as a kind of reaction force to protect the penetration of material into the holding force die. The predictions are discussed to reveal the effect of the reaction-to-die penetration scheme.
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