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안영재,유장열,권오관,김영조 대한기계학회 1989 대한기계학회논문집 Vol.13 No.4
본 연구에서는 제트 분사 시스템을 제작하여 절단 성능에 관게하는 여러 변수중 고압수의 압력, 연마제의 크기 및 공급량, 그리고 공작물의 이송속도의 영향을 실험적으로 연구하였다. A jet cutting system is a new concept of cutting device wihch requires high pressure up to thousands of atmospheric pressure. The use of water as a cutting medium brings in many of working advantages such as no dust, no gas, and no thermal distortion. And an introduction of abrasives into the water jet flow increases signigicantly cutting abilities and improves cutting performance. Cutting with abrasive water jet involves many operating variables, including design of the cutting system. For efficient cutting, the operating parameters have to chosen properly. In spite of several attempts to develop the cutting model theoretically, all of the optimization of the operating parameters is based upon exerimental results of each jet cutting system. In this paper, the effect of the parameters was measured and analysed in terms of pressure, abrasive, and transverse rate of a workpiece. Most of all, sufficient feeding of abrasives is the most important factor for efficient cutting performance.
Contributing Factors on Lymph Node Yield after Surgery for Mid-Low Rectal Cancer
안영재,손승국,이강영,권혜연,박윤아 연세대학교의과대학 2013 Yonsei medical journal Vol.54 No.2
Purpose: The purpose of the present study was to evaluate the contributing factors to the lymph node status as well as to define the impact of preoperative concurrent chemoradiotherapy (CCRT) on the number of lymph nodes retrieved in mid-low rectal cancer. Materials and Methods: We retrospectively analyzed 277 patients who underwent curative surgical resection for mid-low rectal cancer between 1998 and 2007. Eighty-two patients received long course preoperative CCRT followed by surgery. Results: A mean of 13.12±9.28 lymph nodes was retrieved. In a univariate analysis, distance from the anal verge, pT stage, pN stage, lymphovascular invasion, preoperative CCRT had significant influence on the number of lymph nodes retrieved. In a multivariate model, patients in the CCRT group had fewer retrieved lymph nodes than the non-CCRT group (p<0.001). Both univariate and multivariate analyses showed that the ypN0 group had fewer retrieved lymph nodes than the ypN1-2 group (p=0.027) in the CCRT group. Conclusion:Preoperative CCRT was an independent risk factor for failure to harvest an appropriate number of lymph nodes, and node-negative patients who received CCRT had fewer lymph nodes harvested.
안영재,박윤준,김명준,한석주,오정탁,Ahn, Young-Jae,Park, Yoon-Joon,Kim, Myung-Joon,Han, Seok-Joo,Oh, Jung-Tak 대한소아외과학회 2007 소아외과 Vol.13 No.2
Foreign body ingestion is a frequent event in the pediatric age group, but the incidence of foreign bodies in the appendix is very low. The authors report a case of ingested foreign body trapped in the appendix in a 7-year-old girl. The foreign body was successfully treated by laparoscopic appendectomy under fluoroscopic guidance.