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Gas Blow Forming 공법을 적용한 스틸튜브재 확관성형 공정에 관한 연구
정경근,김동옥(D. O. Kim),이상일(S. I. Lee),김정섭(J. S. Kim),황한영(H. Y. Hwang),K. G. Kim 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
Due to the high demanding for fuel efficiency and more strict regulation for CO2 emission, automotive companies have focused their R&D activities onto the reduction of body and chassis components by using high strength steel. Some of the companies have used gas blow forming process for aluminum extrusion parts since it can be formed under the 500℃. However, its commercialization has been limited due to the high cost of aluminum alloys and relatively low strength compared to that of steel. Thus, in this research, steel tube has been gas blow formed under high temperature for a chassis application, and optimized design and process parameters have been studied. Tube bending and bulge forming simulation has been carried out, and it was compared to the experimental results.
마그네슘 판재의 레이저 국부가열 헤밍성형 제품 미세조직변화 고찰
정경근(K. G. Jung),김래형(R. H. Kim),윤태욱(T. W. Yoon),이규현(K. H. Lee),김동옥(D. O. Kim) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
In recent, there is an active research for automotive companies to apply magnesium alloy sheet on automotive body structure including outer panel components. For moving parts such as hood, door, trunk lid, and fender, hemming process is necessary since they consist of outer panel and inner panel. Hemming is the process which the flange of outer panel is bent over the around of inner panel to assemble together. Roller hemming has been applied for aluminum components since this is a desirable process for small number of production due to its longer cycle time than conventional press hemming. It has also been considered as an appropriate process for aftermarket due to its flexible production system. However, it is still difficult to apply roller hemming process on magnesium alloys since the formability of the alloy is limited at room temperature. Thus, in this research, AZ31 has been roller hemmed with laser heating, and its microstructure has been studied after hemming process.
유방 보존술 후 내유림프절을 포함하는 방사선치료 기법에 관한 연구
정경근(Kyoungkeun Jeong),심수정(Su Jung Shim),유세환(Sei Hwan You),김용배(Yong Bae Kim),금기창(Ki Chang Keum),김종대(Jong Dae Kim),서창옥(Chang Ok Suh) 대한방사선종양학회 2009 Radiation Oncology Journal Vol.27 No.1
목 적: 유방암 환자에서 부분적 유방절제술 후 내유림프절(internal mammary lymph node: IMN)을 포함하여 방사선 치료하기 위한 최적의 치료 방법을 찾고자 하였다. 대상 및 방법: 초기 유방암으로 부분적 유방절제수술을 받고 방사선치료를 받은 10명의 환자들의 CT simulation 데이터를 얻어서 각 환자들에서 4가지 치료방법을 계획하고 평가하였다. 5명은 오른쪽 유방을, 나머지 5명은 왼쪽 유방을 치료 받았다. 각 환자에서 유방, 쇄골 상부 림프절(supraclavicular lymph node: SCL), IMN (위쪽 3개의 늑골사이에 있는 림프절만 포함)을 조사하는 치료계획을 하였다. IMN을 조사하는 방법으로 4가지 방식, 즉 표준적인 접선방향 치료(Standard Tangential Field: STF), 확장접선치료 방법(Wide Tangential Field, WTF), 부분 확장접선치료방법(Partially Wide Tangential Field: PWT), 광자와 전자를 혼합한 방법(Photon-Electron Mixed 5 Field: PEM)을 사용하였다. SCL field는 3 cm에, 유방조직은 중심점에 50.4 Gy를 28회에 나누어 치료하도록 처방하였다. 결 과: 각각의 치료 기법은 환자마다 차이는 있었으나 뚜렷한 특징을 보였다. 유방조직의 선량은 각 치료 기법마다큰 차이가 없었다. IMN는 치료 기법마다 차이가 있으나 STF를 제외한 세 가지 방법은 대체로 IMN을 잘 감싸고 있었다. 왼쪽 유방을 치료하는 경우 심장이 받는 선량은 고선량 영역에서는 WTF, PWT, PEM, STF의 순으로 많은 체적에 선량을 받았으며 낮은 선량 영역에서는 PEM, WTF, PWT, STF의 순이었다. 동측 폐의 선량 역시 마찬가지의 순서를 보였다. Lyman-Kutcher-Burman model에 의한 방사선 폐렴에 대한 NTCP는 개인별 편차가 컸다. 대체로STF가 가장 작고 PWT가 다음이었으나 PEM와 WTF의 경우는 환자마다 큰 차이를 보였다. 결 론: 환자들의 다양한 체형에도 불구하고 IMN를 포함하여 치료하는 경우 PWT가 폐와 심장의 조사선량을 줄이고 IMN에 표적선량을 전달하는데 적합한 것으로 생각된다. Purpose: This study was designed to determine the optimum radiotherapy technique for internal mammary node (IMN) irradiation after breast-conserving surgery. Materials and Methods: We selected ten cases of early stage partial mastectomy for plan comparison. Five of the patients were treated to the right-side breast and the rest of the patients were treated to the left-side breast. For each case, four different treatment plans were made to irradiate the entire breast, IMNs and supraclavicular lymph nodes (SCLs). The four planning techniques include a standard tangential field (STF), wide tangential field (WTF), partially wide tangential field (PWT) and a photon-electron mixed field (PEM). We prescribed a dose of 50.4 Gy to the SCL field at a 3 cm depth and isocenter of the breast field. Results: The dose distribution showed clear characteristics depending on the technique used. All of the techniques covered the breast tissue well. IMN coverage was also good, except for the STF, which was not intended to cover IMNs. For the cases of the left-side breasts, the volume of the heart that received more than 30 Gy was larger (in order) for the WTF, PWT, PEM and STF. For radiation pneumonitis normal tissue complication probability (NTCP), the PWT showed the best results followed by the STF. Conclusion: Despite the variety of patient body shapes, the PWT technique showed the best results for coverage of IMNs and for reducing the lung and heart dose.