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정성현(S. H. Jeong),권정희(J. H. Kwon),홍대선(D. S. Hong),이승영(S. Y. Lee) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
A Swiss-type lathe in which the main spindle is horizontally moved while machining is frequently used for machining bar-type metals such as steel and titanium. Accompanying such a lath, a bar feeder unit is generally used for loading and supplying a set of bars. Currently, most bar feeders units using in industry are delivered from foreign country manufacturers. Meanwhile, especially when a long and small-diameter bar is machined, vibration or whirling of the bar is occurred, and successively it deteriorates the quality of the products. To overcome such problem, this study develops a bar feeder unit which can handle long and small round bars for Swiss-type lathes in such a manner that whirling of the bar being machined is minimized to ensure the product quality. In this bar feeder unit, a push-pull mechanism plays an important role of suppressing such whirling phenomena when a bar is being machined. This mechanism pulls the round bar when being machined while it pushed the bar when being supplied. The effect of pulling action to suppress whirling is verified through a series of experiments. The experimental results show that the developed bar feeder unit can successfully handle long and small round bar for Swiss-type lathes.
송정민,백홍,이승영,장동혁,서무엽,박길종,맹은호,Song, J.M.,Baek, H.,Lee, S.Y.,Jang, D.H.,Seo, M.Y.,Park, G.J.,Maeng, Eun-Ho 대한의용생체공학회 2013 의공학회지 Vol.34 No.2
The goal of this study is to develop test method for evaluating the drug eluting properties of drug eluting stents (DES). PBS and the detergent solutions, presented by each DES manufacturer, were used for drug release of DES coated with paclitaxel, zotarolimus and everolimus. The drugs which are coating DES were not released by PBS but released by the detergent solutions, finally paclitaxel 83.38%, zotarolimus 103.85% and everolimus 115.78%. It seems that the use of the detergents is necessary in order to release the drugs because those drugs are extremely hydrophobic. In conclusion, using of detergent solutions presented by each manufacturer were suitable for evaluating the drug eluting property of drug eluting stent.
실리콘겔 인공유방의 기계적 및 물리화학적 특성에 대한 연구
백홍,장동혁,송정민,이승영,서무엽,박길종,맹은호,Baek, H.,Jang, D.H.,Song, J.M.,Lee, S.Y.,Seo, M.Y.,Park, G.J.,Maeng, E.H. 대한의용생체공학회 2012 의공학회지 Vol.33 No.2
The purpose of this study is to develop the guideline of the physicochemical and mechanical properties evaluation for silicone gel filled breast implants. First of all, the use and development status for silicone gel filled breast implants were investigated, and then, standard and criteria about performance evaluation established by the international organizations such as ASTM, FDA guidance and ISO were examined. To evaluate the mechanical properties, data research and testing for breaking strength, elongation, tensile set, joint intensity, silicone gel cohesion, weight loss from heating, static rupture resistance, impact resistance test, fatigue test, and gel bleed were performed. On the other hand, to evaluate the physicochemical properties, volatile matter, extent of cross linking, heavy metals, and extractable were analyzed. In this study, results for general function, mechanical properties and physicochemical properties were examined and reviewed for the accordance with international standard, and objective and standardized guideline was provided.