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구양,허정식,Koo, Yang,Heo, Jung-Sik 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.4
In this paper, to choose the optimum CBN wheel for Internal Grinding at LM Guide, among 7 types of CBN-wheels, the 2 types of CBN-wheels, which were the macrofracture CBN wheel and the microfracture CBN wheel, have been used, and the SCM420H have been used as the workpiece. The working conditions in the grinding experiments were depth-of-cut, table speed, and spindle speed for 4 types of the CBN grinding wheels, 2 types of the lubrications. By the experiments, the loading effect of the microfracture types of the CBN-wheel needed a short dressing interval and resulted in grinding wheel wear and bad surface roughness. However, a macrofracture type of CBN-wheel with the concentration of 100, CB120Q100V showed the best surface roughness quality at a low table speed for internal grinding at LM-guide.
구양,김경년,Koo, Yang,Kim, Gyung-Nyun 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.4
In this study, the grinding characteristics of CBN wheels, such as grinding force and surface roughness, have been compared and analyzed from various working conditions of spindle speed and depth of cut. To actualize high efficient grinding at ceramic and silicon nitride material, electrolytic in-process dressing (ELID) method has been applied at metal bonded diamond and CBN wheels. Super precision grinding using ductile mode at difficult-ta-cut materials could be performed.
직조기 바늘의 초정밀 연삭을 위한 연삭숫돌 개발 및 성능평가
윤승진(Seung-Jin Yun),구양(Yang Koo),곽재섭(Jae-Seob Kwak),하만경(Man-Kyung Ha) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
The aim of this study is to design the grinding wheel and the forming die as well as to evaluate grinding parameter's effect on the wear amount and the surface roughness. For convenance sake, the scheme of design of experiments was considered. The grade of the developed grinding wheel was tested for forming pressure and sintering conditions. The response surface models were successfully developed to predict the wear amount of the grinding wheel and the surface roughness using the experimental results. And also parameter optimization of the special purposed grinding wheel for textile industry was performed by the genetic algorithm.
김상오(Sang-Oh Kim),구양(Yang Koo),하만경(Man-Kyung Ha) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
The grinding process is dissimilar to other conventional machining methods such as turning and milling. The difference between them is due to not only the cutting edges of the grinding wheel don’t have the uniformity but also the edges act differently on the workpiece at each grinding. In spite of many researches during past decades, describing the grinding action between the grinding wheel and the workpiece was not made clearly. So statistical models and computer simulations that could overcome the variety of the cutting edges were introduced. These complexities and difficulties of illustrating the grinding process also raised an obstacle to the optimization of the grinding process and to the verification of the interrelationship between the grinding parameter and the obtained grinding result. In present paper, the finest grinding wheel for textile industry was developed by using the response surface method, genetic algorithm and Taguchi method to predict surface roughness and wear of the grinding wheel.
송치욱(Chi Wook song),구양서(Yang Suh Koo),이홍식(Hong Sik Lee),이상우(Sang Woo Lee),최재현(Jai Hyun Choi),김창덕(Chang Duck Kim),류호상(Ho Sang Ryu),현진해(Jin Hai Hyum) 대한소화기학회 1995 대한소화기학회지 Vol.27 No.4
N/A Background/Aims: Recently the esophagus is considered a major source of recurrent noncardiac chest pain to patients in whom exercise stress test and/or cardiac catheterization have excluded a cardiac etiology. To investigate the esophageal origin of noncardiac chest pain, esophageal motility tests including manometry, provocation test, and radioisotope esophahgeal transit study(RETS) were studied in patients with noncardiac chest pain. Methods: A total of l26 patients with noncardiac chest pain were assessed;they included 41 patients with normal coronary angiogram and 85 patients with normal noninvasive cardiac tests such as echocardiogram and exercise stress test done in Korea University Hospital from Feb. l993 to Aug. 1994. Results: 56 out of 126 patients(44.4%) with noncardiac chest pain had abnormal manometric findings which included 20(35.7%) nonspecific esophageal motility disorder, 17(30.4%) hypertensive lower esophageal sphincter, 9(16.1%) hypo- tensive lower esophageal sphincter, and 2(3.6%) nutcracker esophagus. Thirty eight out of 126(30.1 %) patients had abnormal manometric findings but no reproducible chest pain by provocation test and were considered to have a probable esophageal chest pain. When patients having positives for both provocation tests are counted as a single positive, 39 out of l26(3l /o) patients had their chest pain reproduced and were considered to have a defini(e esophageal chest pain. The combination of patients with definite esophageal chest pain(31%) and probable(30.17c) gave an overall diagnostic yield of 61.1% for our esophageal laboratory. There was no significant difference between invasive cardiac test group and noninvasive cardiac test group in the results of esophageal motility tests. RETS merely reflected the peristaltic abnonnalities with no more informations for esophageal chest pain. Conclusions: These results reveal that esophagus is considered a source of noncardiac chest pain in 61.1%. Provocation test complements esophageal manometry alone and increases diagnostic yield. RETS can be used in diagnosis of noncardiac chest pain accompanied by peristaltic abnormality of the esophagus. (Korean J Gastroenterol 1995;27:381-387)
이구(Goo Lee),조은래(Eun Rae Jo),구양서(Yang Suh Koo),이홍식(Hong Sik Lee),이상우(Sang Woo Lee),김창덕(Chang Duck Kim),류호상(Ho Sang Ryu),현진해(Jin Hae Hyun) 대한소화기학회 1994 대한소화기학회지 Vol.26 No.5
Carcinoma of the extrahepatic bile duct,s may be classified as papillary, nodular, scirrhous constricting and diffusely infiltrating types according to their rnacroscopic characteristics. Among these, the papillary carcinomas are polypoid lesions that grow exophytically into the duct lumen and often produce duct obstruction before they invade the wall of the duct. For this reason, they are more favorable than the other forms and offer the greatest chance of cu- rative resection. Hence we report two cases of papillary adenocarcinoma of extrahepatic bile ducts for which curative surgery was performed successfully. (Korean J Gastroenterol 1994; 879 884)