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형체압축성형에 의해 압축효과를 가미한 2.5인치 도광판의 복굴절 저감에 관한 연구
김종선(J. S. Kim),고영배(Y. B. Ko),황철진(C. J. Hwang),민인기(I. K. Min),유재원(J. W. Yu),윤경환(K. H. Yoon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Recently, injection molded plastic optical products are widely used in many fields, because injection molding process has advantages of low cost and high productivity. However, there remains residual birefringence and residual stresses originated from flow history and differential cooling. In the present paper, focused on reducing birefringence in optical plastic parts using injection-press molding. And the effects of injection-compression and injection-press mode with normal injection mold on the distribution of birefringence were studied. It was found that the birefringence was reduced for the cases of low initial clamping force in injection-compression mode and for the cases of longer mold opening length in injection-press mode.
휴대폰용 2 인치 LCD-BLU의 광특성에 미치는 음각 및 양각 광학 패턴의 영향 연구 : Ⅱ. 금형 및 광특성
황철진(C. J. Hwang),고영배(Y. B. Ko),김종선(J. S. Kim),민인기(I. K. Min),유재원(J.W. Yu),윤경환(K. H. Yoon) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Recently, many researches have been done to improve optical performance of LCD-BLU(Back Light Unit). One of the most important parts in LCD-BLU is LGP(Light Guiding Plate). Micro-patterned LGP is known to have different optical characteristics depending on their shape, pattern density and size, etc. In the present study, a micro-optical patterned LGP mold was fabricated using LiGA process. The difference in the optical characteristics between positive and negative patterned LGP’s was investigated by fixing the density, location and size of each pattern. It was found that the negative patterned LGP showed better optical characteristics than positive one.
이균정,최우혁,유재원,서종범,최서형,신태민,Lee, G.J.,Choi, W.H.,Yu, J.W.,Seo, J.B.,Choi, S.H.,Shin, T.M. 대한의용생체공학회 2009 의공학회지 Vol.30 No.6
Diseases caused by indurate tissues of the internal organs are liver cirrhosis and abdominal sclerosis. The cause of chronic gastro-intestinal disease is a digestive system disorder and a defecation disorder. They impede peristaltic movement and digestive system with the symptom that indurate tissues. The purpose of the present study was to determine the disease grade quantitatively by measuring an indurated standard of tissues and organs. For the measurement of elasticity, we designed the system that measure the displacement of the substance and approved pressure using ultrasound transducer. For verification of developed system, we compared elasticity as results of experiment between the developed system and public elasticity measurement machine at individual plastic phantoms made by plastic hardener and softener. Elasticity of the plastic phantoms is averagely 0.007MPa lower measured by developed system than Micro-indenter, and less than 10% errors. Comparing with economical value and accuracy between developed system and Micro-indenter, the system is significant of measurement for tissue elasticity. Thus, it is possible to measure a elasticity at human tissue and organ. A chronic gastro-disease as well as grade could be decided objective validity using this system.