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RISS 인기검색어
- 검색키워드
- 저자 : 이강영(Kang Yung Lee) (검색결과 2 건)
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서동환(Donghwan Seo),강태엽(Tae Yeob Kang),민준기(Joonki Min),이강영(Kang Young Lee),구영권(Young Gwon Gu),이강영(Kang Yung Lee),양일영(Il Young Yang),홍정표(Jeong Pyo Hong),김성규(Sung Kyu Kim),유상우(Sang Woo Yu) 한국신뢰성학회 2019 신뢰성응용연구 Vol.19 No.2
Purpose: Nowadays, it is necessary to ensure that defense systems, which have become very complex and modernized, are highly reliable. To prove the reliability of defense systems, reliability demonstration tests are usually required. The present study develops a method to design reliability demonstration tests for missiles stored in ammunition igloos without maintenance. Methods: The procedure followed herein is as follows. (1) Analysis of operation environments and effective stresses; (2) classification of fault mechanisms and their causes; (3) derivation of an accelerated factor (AF); (4) design of an accelerated test. Results: The reliability target of the missile is B10 : 10 years. Conditions for the test plan are as follows: shape parameter = 1, number of samples = 5, AF = 48.544, and confidence level = 60%. Finally, the test period according to the designed accelerated test plan was 3,139 h. Conclusion: We proposed a method to design reliability demonstration tests for missiles in the development period. The results of this study are expected to contribute to the development of reliable missiles that can be stored for long periods.
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李康寧,高永杜,金正敎,河浩成,姜奉淳,朴道秉,姜淮 慶尙大學校 1978 論文集 Vol.17 No.2
This study attempts to analysis the present situation of farm management and the related industriesin order to present the suitable industries for promoting the farmers' income in mountain area. This study is based on the survey data obtained from 30 sample mountain vellages in 10 Guns located in central, wetern and northen Kyeougnam Province, where lots of mountain vellages are scattered here and there. Major findings obtained from the analysis are summarized as follows: 1) Area of cultivated land in mountian villages was generally smaller than that in plain vellages. BUt major finding of thes tudy indicated that the standard of living in the study area depended upon not only the size of cultivated land but also the skills of management to understand exavtly the regional and togographical situaltion, to utilize the developmental resources effectively, and to diversify income sources. This means that upbringing of competent Saemaul leaders is very important for promoting the income of mountain villages. 2) Various crops were being planted in a samll scale inmountain area. And those crops except rice adn barley were planted for self-sufficiency. Therefore, it is desired to select and cultivate intensively the kinds of crops which are regionally adn topographically suitable for maximizing farm inceomes of subsistant farmers. 3) The survey found out that in mountain area the farming of extensive fruits like chestnuts, persimmons, etc. is more favorable than that of intensive fruits like apples, pears, etc. 4) Because of topographical inappropriateness and lack of fertile cultivates land in mountain area, mowt vegetables, except onions in a few regions, were growing in a small scales for self-sufficiency. And the future of the vegetable cultivationin mountain area is also gloomy. 5) Since various grasses are abundantly growing in the wild in mountain area, the mountain villages are suitable for raising the herbivorous animals. Therefore it is recommeded to encourage raising the herbivorous animals, especially cattle, as one of the major income sources in mountain area. 6) It is true that sericulture has greartly contributed to the economic growth in mountain area with aboundant land suitable for mulberry trees. Recenly sericulture has, however, been shrinking due to the barriers of silk exportation. Without the barriers of silk exportation, sericulture will still play an important role on providing one of the major sources tom mountain villages. 7) The miscellaneous trees in most forest around the mountain villages were growing planlessly. Those parts of the forest are needed to be renewed by planting the useful, endurable, and regionally and topographically suitable kinds of trees.
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