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프리폼 형상이 딮드로잉 제품의 코너충진 정도에 미치는 영향
박준홍(Joon Hong Park),김승규(Seung Kyu Kim),백승걸(Seung Kul Baek),박영철(Young Chul Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
In deep drawing processes, the wall thickness in the sheet metal forming always decreases which causes lots of dimension problems. In this paper, the decrease in wall thickness at the corner was minimized through the newly developed preform shape and it was found that the wall thickness increased in a certain degree. The calculated distribution of the wall thickness after forming was in good agreement with the experimental results. The effects of the corner radius and the preform shape on the decrease in wall thickness at the inner corner were examined by both FEM simulation and experiment.
박준홍 ( Joon Hong Park ),이정열 ( Jung Youl Lee ),이혜진 ( Hye Jin Lee ),박영립 ( Young Lip Park ),정현 ( Hyun Chung ),황규왕 ( Kyu Uang Whang ) 대한피부과학회 1998 대한피부과학회지 Vol.36 No.3
Necrotizing fasciitis is a life-threatening, invasive soft-tissue infection that is characterized by widespread, rapidly developing necrosis of the subcutaneous tissue and fascia with relative sparing of the skin and underlying muscle. In type I necrotizing fasciitis, anaerobes and gram negative bacteria are predominant; in the type II form, Group A p-hemolytic streptococcus is a major etiologic agent. It needs immediate surgical intervention for a favorable outcome. A 64-year-old male presented with extremely painful, erythematous, symmetric, tense swelling with yellowish or hemorrhagic blisters on his right upper extremity. Two weeks before the admission, pain on his elbow made him take acupuncture therapy, There was severe tenderness, pitting edema, and his right elbow showed limited flexibility. The patient underwent wide debridement and drainage immediately. Liquefactive necrosis was seen in the subcutaneous fat and superficial fascia without muscular involvement. Group A B-hemolytic streptococci were grown from the tissue culture specimen. (Korean J Dermatol 1998;36(3) 515-519)
박준홍(Joon-Hong Park),김효겸(Hyo-Gyeom Kim),김현수(Hyun-soo Kim),전언찬(Eon-Chan Jeon),송정한(Jung-Han Song) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
The performance of cooling tower is affected mainly by the thermal performance of cooling tower. In this paper, designed the shape of new fill based on the shape of plate heat exchanger. A contrast of heat transfer performance is executed by numerical analysed. And fur new fills have been devised and their performance have been compared with those of existing fill to find shape.