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레이저 경화면의 형상특징 해석을 위한 프랙탈 차원의 적용
옥철호,조연상,배춘익,박흥식,전태옥 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.2
The determination of surface topography is believed to be extremely important in the areas of contact mechanics, adhesion and friction. In order to describe topography of various frictional surface, the harding test was carried out under different experimental conditions in dry friction. And fractal descriptors was applied to frictional surface of laser modified steel with image processing system. These descriptors to analyze surface structure are fractal dimension. Surface fractal dimension can be determined by sum of intensity difference of surface pixel. Topography of frictional surface can be effectively obtained by fractal dimensions.
YAG LASER에 의한 공구강의 표면개질에 관한 연구
옥철호,강형식,박흥식,전태옥 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.2
Laser induced surface hardening of Tool steel(STC5) can be achieved either with or without surface melting. In trans-formation hardening, as the surface is heated to a temperature below its melting point and is rapidly cooled, solidified microstructures are usually much finer and stronger than those of the base matals. For this reason, surface modification of tool steel by YAG laser irradiation has been studied as a fuction of processing parameters such as, power density, pulse width, defocusing distance, and molten depth. The high energy density changes and refines the microstructure of the near surface layer. In the case of beam passes, martensite formed in the melt zone exhibited very high vickers hardness values. Molten depth and width depend on defocusing distance, and energy of black color painting is more absorptive than other color painting.
SM45C의 Laser 표면개질 조건에 따른 마멸특성에 관한 연구
옥철호,임동욱,서영백,박흥식,전태옥 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.1
Surface modification of plain carbon steel (SM45C) by Laser are usually much finer and stronger than the base metals. Nd-YAG laser source changes and refines the microstructure of the near surface layer, leading to enhanced hardness and wear resistance. The present study was undertaken to investigate the wear behavior and a processing parameters such as, power density, pulse width, defocusing distance, and molten depth for surface modification. The wear test was carried out under different experimental condition using the wear test device and the annular surfaces of wear test specimens as well as mating specimen of alumina ceramics(Al_2O_3) was rubbed in dry sliding condition. The results show that molten depth and width depend on defocusing distance. The wear loss was much in lower speed range below 0.2m/sec and in higher speed range above 0.7m/sec, but It was little in intermediate speed range. It depends on oxidation and wear speed.
장철호,최태욱,김진욱 圓光大學校 醫科學硏究所 1998 圓光醫科學 Vol.14 No.2
Bilateral vocal cord paralysis are uncommon but tend to occur after thyroid surgery or head injuries. The cords are often closed to the midline and paramedian position, therefore the airway is already compromised. So these patients often require tracheostomy and intubation. If compromised airway is not improved after observation, surgical treatment which is for the permanent airway maintenance should be carried out. We have experienced arytenoidectomy for three cases of bilateral vocal cord paralysis. Two of them were treated by external arytenoidectomy and the other was treated by laser arytenoidectomy. The results were relatively satisfactory. So we report these cases with brief review of the literature.
김형철,강길호,채만규,김성용,백무준,이문수,박상흠,이문호,김창호,송옥평,조무식,박희주 순천향의학연구소;Soonchunhyang Medical Research Institute 2000 Journal of Soonchunhyang Medical Science Vol.6 No.1
Purpose : The Mirizzi syndrome is relatively rare and preoperative diagnosis of this disease is difficult. In 1978, Morelli suggested the subclassification of the Mirizzi syndrome into acute or chronic form. We experienced 5 cases of acute form. We analysed clinical features, preoperative radiologic findings and operative findings of 18 cases including acute forms which were diagnosed as Mirizzi syndrome and should suggest the modified classification of Mirizzi syndrome for choice of appropriate treatment. Method : From January 1995 to December 1998, 18 cases, of which 8 cases were diagnosed at Soonchunhyang University Chunan Hospital, and 10 cases were reported in the Korean Journal were retrospectively analysed with regard to clinical features, preoperative radiologic findings and operative findings. According to the clinical features, whole cases were divided into type Ⅰ(acute form) and type Ⅱ(chronic form) and then each type of cases were subclassified according to preoperative radiologic findings and operative findings. Results : Of 18 cases there were 5 cases in type Ⅰ(27.8%), 13 cases in type Ⅱ(72.2%). Type Ⅱb was most common. Type Ⅰa cases were treated only with cholecystectomy. We applied cholecystectomy, T-tube choledochostomy and patch technique in type Ⅰb and thpe Ⅰc cases. Cholectystectomies including removal of gallstones and internal drainage procedures were done in type Ⅱ chronic forms. Conclusion : The acute form(Type Ⅰ) of Mirizzi syndrome was suggested by Morelli might be subclassified into typeⅠa,Ⅰb and Ⅰc following the presence of the necrotic defect in common hepatic duct. Through the modified classification of Mirizzi syndrome based on clinical feature, preoperative radiologic findings and operative findings, we can choice appropriate treatment.
박철호,김기옥 안양대학교 사회과학연구소 2002 社會科學硏究 Vol.9 No.-
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