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정연식,강익수,김전하,강명창,김정석,안중환 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
Ultraprecision machining and MEMS technology have been taken more and more important position in machining of microparts. Micro endmilling is one of the prominent technology that has wide spectrum of application field ranging from macro parts to micro products. Also, the method of micro-grooving using micro endmilling is used widely owing to many merit, but has problems of precision and quality of products due to tool wear and tool fracture. This investigation deals with state monitoring using acoustic emission(AE) signal in the micro-grooving. Characteristic evaluation of AE raw signal, AE hit and frequency analysis for state monitoring is also presented in the paper.
Rifampicin에 의한 것으로 추정되는 위막성 대장염1예
김수현,이은우,정종혁,문승현,김동한,양혁승,오영상,김호동,김도현,박혁,박정환,박경옥,이영직 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2
Pseudomembranous colitis, caused by altering the normal colonic flora and allowing the multiplication of Clostridium difficile, is an deleterious adverse effect of antibiotics. But it is rarely reported by rifampicin. Rifampicin is one of the first line drug in the treatment of tuberculosis and many patients are exposed to its potential adverse effects. We experienced a patient that had abdominal discomfort and hematochezia due to pseudomembranous colitis after receiving antituberculous medication, and which was probably caused by rifampicin. A 82 years old man was admitted with abdominal discomfort and hematochezia for one week. On the past history he had been diagnosed as endobronchial tuberculosis about 4 months ago. Colonoscopy revealed multiple discrete whitish mucosal lesion on rectosigmoid colon, and histologic findings were consistent with pseudomembranous colitis. The antituberculous agents were discontinued and vancomycin was administered. The patient's symptoms were resolved within several days. There was no recurrence after reinstitution of the antituberculous agents excluding rifampicin. We report here on a case of pseudomembranous colitis probably due to rifampicin.
徐日煥,秋錦洪,李珍昊,林星秀,柳保盈,朴晶蘭,金憲俊,成百石,李正秀,金文執 충남대학교 자연과학연구소 1993 忠南科學硏究誌 Vol.20 No.1
The multiplicity factor, which may be defined as the number of different planes in a form having identical interplanar spacing and identical intensity, is tabulated here for eleven Laue groups on the basis of their symmetries.
인정제,신용승,김헌영,김재우,송명환,박진수 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
The contact forces between die components for the drawing of large size automotive panels introduce elastic deflections of the die components. Due to the deflections, the gap between blank holder and die varies locally resulting in nonuniform material flow. Such a nonuniform die gap usually requires correcting operation, so called die spotting, which is time consuming trial and error process. To reduce the die spotting time, the optimization of the blank holder bending deflection is needed. In this paper, we implemented an analysis procedure to predict the blank holder deflection. The analysis procedure and design of experiments techniques are applied to the optimization of balance block heights. The optimization results can be used as guidelines in actual die spotting process.
정해룡, 유장환, 윤성현, 권수정, 우선희 충북대학교 농업과학기술연구소 2022 農業科學硏究 Vol.38 No.2
Adzuki bean is sensitive to waterlogging stress. The overall study on the waterlogging stress is limited comparing to the study on the drought and any environmental stress. Therefore, the present study was conducted to investigate the changes in growth characteristics and the expression patterns of proteins at the 5-leaf stage periods of adzuki bean. The domestic cultivar, Arari (Miryang No. 8) was used to test the waterlogging stress. In the waterlogging treatment for 3 days, the plant height showed slightly decrease in the treatment at 3 days of waterlogging, but root fresh weight showed significantly changes at 3 days of the waterlogging treatment. Chlorophyll contents showed also significantly different at 3 days of waterlogging treatment compared to control the plants. The waterlogging stress gradually influenced the growth differences between the control and the treatment respectively. More than 350 pro- tein spots were identified on 2-D gels using an image analysis. Moreover, a total of 28 proteins were analyzed using LTQ-FT-ICR MS. Among these 28 proteins, a total of 18 proteins were up-regulated, and 10 proteins were down-regulated under waterlogging treatment. According to biological process, the most of the proteins were found to be involved in carbohydrate metabolism. Regarding the subcellular local- ization, most of the proteins were localized into chloroplasts in 5-leaf stage.
고영환,강경수,김재하,고정삼 濟州大學校 工科大學 産業技術硏究所 1991 産業技術硏究報告 Vol.2 No.-
Activated sludge process which has been widely applied t o the treatment of waste-water was slightly modified to remove hydrocarbons from wastewater. The process of wastewater treatment consisted of two consecutive reactors. Cells of Acinetobacter calcoaceticus were first cultivated in synthetic wastewater containing 3% (W/V) of hydrocarbons. The resulting culture was then exposed to acclimatized active sludge. Hydrocarbon concentrations of the effluent from the process were 0.19-0.21% (W/V). The contents of suspended solid were reduced to 17-53 ㎎/l. The data imply that A. calcoaceticus can be used for the treatment of wastewater containing hydrocarbons.
崔淙洙,韓正煥 忠北大學校師範大學附設 平生體育硏究所 1993 平生體育硏究所 論文集 Vol.6 No.-
The role and the function for the modern people are being deversified and varied in many ways owing to the material culture. With the representative books selected for the definite period, the wants I have considered the variation of the leisure are follows; 1) Accordign to the industrialization, the working hour is decreasing and leisure time is increasing, but the activity for this situation is not enough. 2) Female sex has more leisure time than male sex, but the leisure activity for female is wanting. 3) the ones who are over thirties have more leisure time than any other ages. 4) There are much different quantities of leisure time according to the kind of their vocation, so the leisure activity program for his own job is necessary. As a result of my studying for these situations. I have got the follwing conclusions. 1) The need for sports and creative recreations increasing. 2) Male is sleeping much time in sports, travel, and other activities, but female is spending her time in sleeping and domestic chore. 3) More educated people are enjoying more creative activities and sports, but less educated people are spending their time in sleeping, domestic chore, and watchig TV. A rural area has worse leisure time than a urban one an this present situation has been depended in the modernization of korea. Therefore the betterment should be made after due consideration of the difference of leisure time and quality of leisure action.
徐日煥,李正秀,李珍昊,秋錦洪,成百石,林星秀,柳保盈 충남대학교 자연과학연구소 1992 忠南科學硏究誌 Vol.19 No.2
三斜晶系에는 2個의 空間群이 있고 單斜晶系에는 13個의 空間群이 있다. 本 論解에서는 이 空間群들을 誘導한후 各 空間群에 屬한 一般位置, 原點移動, 特殊座標 및 反射條件들을 說明 하였다. There are two and thirteen space groups in triclinic and monoclinic systems respectively. After derivation of the space groups, the general coordinates, the special coordinates and the reflection conditions of each space group have been discussed and change of origin of certain space groups is also shown.