압력용기의 설계기준 및 손상 평가

오환섭,정효진,박상필,손두익 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

The damage of the pressure courage by degradation can become the reason of unexpected break down or failure accident and it is very important because safety accident, the production loss, environmental pollution, social problems are occur. Consequently The result to investigat of failure accident for domestic pressure vessel, the factor of degradation is SCC, Sorrosion, Cavity, Crack

多國籍企業 生成過程에 관한 硏究 : 一次大戰以前의 美國을 中心으로 A Case Study of the U.S. MNC before 1914

吳斗煥 啓明大學 産業經營硏究所 1977 經營經濟 Vol.8 No.1

The purpose of this study to present the early history of American multinational corporations with reference to the factors contributing to the emergence of MNC. Ultimately this hopes to throw light on the necessary preconditions for the development of MNC and to analyze the motives for direct investment abroad. The theme was chosen because the analysis of the problems above lays the basis for understanding the fundamentals of MNC and also in view of the fact that the U.S. owns the majority of the large MNCs in the world. The methode of analysis used is rather historical because the problems in question are too entangling to draw a definite theory. Since the thems under consideration is also discussed by theoreticians, however, it is necessary to review the existing theories of direct investment. Such a review provides the general framework for the in inquiry attempted in this paper. According to a traditional theory, capital movements across the international boundaries always take the form of portfolio investment, not direct investment, under the conditions of perfect competition. The cause of the worldwide phenomenon of direct investment, there must exist the difference of productivity of capital, and hence the price of capital, between countries. Although this is the necessary condition for direct investment, it does not form the sufficient condition. It is necessary to analyze the reason why the rate of return for portfolio investment cannot reflect the profit rate of direct investment. There are several divergent theories of direct investment to account for this phenomenon. Two theories most after mentioned in the literature are the product life-cycle theory by Vernon and oligopolistic market behaviour theory by Kindleberger. The two theoris are not yet firmly established. It is, therefore, not appropriate to adopt any one theory in the study of the motives for direct investment. Since the risk level of direct investment is clearly higher than that of portfolio investment. there must exist not only some inducements to compensate for higher risk but also the technical know how for the presence of direct investment. Therefore, this paper analyzes the motives for direct investment, focusing on the technological superiority and monopolistic character of investing firms as the sources of special advantages. Although it is often said that MNC has emerged since 1950, a considerable number of American firms were already engaged in international business activities before 1914. The important landmarks of the historical emergence of MNC in the U.S. before 1914, were as follow. First, as the economic development of the U.S. proceeded after 1860, local firms were gradually converted into national industries. During this period, the U.S. achieved the rapid improvement of technology. American companies as a result came to have competitive superiority in the world trade, contributing to the emergence of MNCs. Second, the merger movement occurred in the U.S. after the panic of 1893, culminating in the emergence of huge American corporations. The motives for the engagement in international business activity seem to have come largely from market considerations. For example, the firms made their investment where the demand for their products were sufficiently large such as in Canada and Europe. The specific reason why each enterprise decided to invest in a finishing, assembling, manufacturing or refining facilities was individual. It can be generalized, however, that firms invested in foreign manufacturing facilities when the costs of production were cheaper there compared to the cost in the U.S. Many decisions were made also in response to foreign government actions. High protective tariff wall prompted firms to manufacture their products behind the tariff walls, for example. The distinguishing phenomenon was that American multinational corporations typically did not search for supplies of raw materials, as was the case with the MNCs of other national origins. In conclusion, this paper shows that the U.S. business activities abroad before 1914 was quite significant and not peripheral to domestic business activities. The total amount of direct investment abroad in those period was not small compared to the GNP at that time. It can also be shown that the motives for direct investment before 10914 were quite similar to those of the American MNCs today.

신생검증례에 의한 사구체신질환의 분석

최두환,구시선,배승훈,박병현,안선호,송주흥 圓光大學校 醫科學硏究所 1996 圓光醫科學 Vol.12 No.2

To elucidate the incidences and the clinical characteristics of glomerular diseases in our hospital, we reviewed the clinical records and histological findings of the 117 cases, which were diagnosed as one of the glomerular disease in renal biospy for about 6 years since 1991. In these 117 cases, 74 cases (63.2 %) fell into primary glomerulonephritis(GN), 18 cases (15.4%) into secondary GN, 2 cases (1.7 %) into end stage kidney, 4 cases (3.4%) into tubulointerstitial disease and the biopsy samples were inadequate for diagnosis in 19 cases. In primary glomerular diseases, most common pathologic diagnosis was IgA nephropathy (36.5 %}, followed by minimal change nephrotic syndrome (29.7%). The incidence of IgA nephropathy would be increased if we had biopsied every asymptomatic urinary abnormality (AUA) patients. Systemic lupus erythematosus (SLE) . hepatitis B accounted for most of secondary GN in our cases. One case of progressive scleroderma was included in this secondary GN. Minimal change nephrotic syndrome (22 cases) was the most common cause of nephrotic syndrome, followed by membranous GN (9 cases) and IgA nephropathy (8 cases). 2 cases of primary amyloidosis were presented with nephrotic syndrome. Nephrotic syndrome as presenting symptom in our IgA nephropathy patients was higher than in other studies, which may be due to indication bias for renal biopsy. We suggest that renal biopsy should be done in adult nephrotic syndrome and in SLE, because various kind of glomerular diseases can develop nephrotic syndrome in adult, renal biopsy can affect the treatment and prognosis in each patients and renal biopsy also determines the extent of renal involvement in SLE on which the treatment depends. In AUA urinary patients, renal biopsy could be reserved for the patients who show declining of GFR or rising of proteinuria. Because IgA nephropathy account for most of AUA. and there is no specific treatment for IgA nephropathy, and renal biopsy in those cases is helpful in ruling out the patients who need no treatment.

수치지도의 작성과 이용에 관한 연구

문두열,박경환 東義大學校産業技術開發硏究所 1998 産業技術硏究誌 Vol.12 No.-

In this study, I intend to suggest a scheme for the efficient administration of the urban infrastructure facilities, I propose a program to manage the ueban-related information more efficiently and to establish a more advanced system od database, by drawing up Digital Map using standard type to set up database. A scheme for geography is proposed, which can manage and maintain the facility, also modify, edit and output the attribute information of facility such as urban-planning. The topography, aerial photogrammetry map, and urban planning map of the concerned region can be got. Using them, the readjustment area and its height can be figured out based on the Digital Terrain Model. Also algorithm of trapezoidal formular should provide a better accuracy than simpson formular to earthwork volume in use.

제주도 연안 갈치 채낚기 어구의 생력화 : 1. 연속식 채낚기어구의 모형 실험

서두옥,정용진,김석종,이창헌,김고환,박용석 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-

The authors carried out a model experiment of continuous hairtail hand line on the rooftop in order to obtain the fundamental data on elimination of labor with hairtail hand line in the coast of Jeju The results are as follow : 1. The continuous main line was rotated smoothly by driving roller. 2. The branch lines and hooks on a main line which was rotated by rotary machine were entangled slightly. 3. The branch lines attached to rubbered model of hairtails to hooks were rotated continuously by the rotary machine.

제주도 연안 갈치 채낚기 어구의 생력화 : 1.연속식 채낚기어구의 모형 실험

서두옥,정용진,김석종,이창헌,김고환,박용석 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-

The authors carried out a model experiment of continuoius hairtail hand line on the rooftop in order to obtain the fundamental data on elimination of labor with haritail hand line in the coast of Jeju. The results are as follow ; 1.The continuous main line was rotated smoothly by driving roller. 2.The branch lines and hooks on a main line which was rotated by rotary machine were entangled slightly. 3. The branch lines attached to rubbered model of hairtails to hooks were rotated continuously by the rotary machine.

李朝未 貨幣整理事業에 관한 一硏究

吳斗煥 서울大學校 經濟硏究所 1979 經濟論集 Vol.18 No.2

韓國 經濟成長과 農業의 役割

吳斗煥 啓明大學校 産業經營硏究所 1979 經營經濟 Vol.11 No.1

자라돔과 볼락의 청각능력지수

이창헌,김고환,서두옥 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-

In order to obtain the fundamental data on behavioral hearing capabilities, the hearing indices of coralfish chromis notatus and black rockfish sebastes inermis which were caught around Cheju island was calculated by their auditory thresholds. The hearing indices of coralfish and black rockfish were 29.1 and 81 on the condition of ambient noise, 10.0 and 19.3 on the condition of white noise respectively.

자리돔과 볼락의 청각능력지수

이창헌,김고환,서두옥 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-

In order to obtain the fundamental data on behavioral hearing capabilities. the hearing indices of coralfish chromis notatus and black rockfish sebastes inerms which were caught around Cheju island was calculated by their auditory thresholds. The hearing indices of coralfish and black rockfish were 29.1 and 81 on the condition of ambient noise. 10.0 and 19.3 on the condition of white noise respectively.