• Title, Summary, Keyword: Maintenence

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A Study on the Introduction of Six Sigma Method to the Maintenence Division (정비 부문의 6시그마 도입에 관한연구)

  • Park, Jai-Hyo;Joo, Ho;Hwang, Tae-Su
    • Proceedings of the Korean Society for Quality Management Conference
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    • pp.10-15
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    • 2010
  • 1996년 국내 6시그마 활동이 도입된 이후 제조업, 서비스업, 대기업, 중소기업, 공공기관등 모든 부문에서 활발히 추진되어 괄목할 만한 개선 성과를 이루었으나, 국방군수 분야인 정비분야에서는 그 활동이 지지부진 하였다. 이에 국방 군수 효율화 운동의 일환으로 2009년 육군종합정비창에서 시범적으로 실시한 6시그마 도입활동을 소개하고 보다 발전적인 방향을 모색함으로써 국방 군수경영 혁신에 기여 하고자 한다.

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A development of value protection cover as safty device in running water pipe (상$\cdot$하수도관의 밸브 개폐통의 안전장치 개발)

  • 허성관;임승환;최종탁
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • pp.267-270
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    • 1998
  • Current valve protection cover had problem that the hight of cover cap and road level could not match when the road was repaired and overcovered. But new developed device can solve this problem by forming several grooves in the connecting pipe. This device is devided into col=netting pipe (down side) and cap part.(upper side) On the outside diameter of connecting pipe, several horizontal grooves and two vertical grooves are formed. Through the horizontal grooves, the hight of cap part ran be adjusted with ground level. Therefore, this device can help easy maintenence in running water pipe.

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The Study of the Process of Smoking Cessation in Adults (성인의 금연과정에 관한 연구)

  • 김애경
    • Journal of Korean Academy of Nursing
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    • v.28 no.2
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    • pp.319-328
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    • 1998
  • The purpose of this study was to explore the process of smoking cessation behavior in adults with a history of smoking cessation. The subject were 17 adults selected by theoretical sampling. The data were collected by in-depth interviews using audiotape recording over a period of six months. The data were analyzed simultaneously by a constant comparative method in which new data were continuously coded in categories and properties according to Strauss and Corbin' methodology. Analysis of the data resulted in the identification of 12 categories. The result of this study are as follows : 1. Smoking cessation in adults is caused by fear about health, environmental pressure of smoking cessation, and intention of smoking cessation. 2. Smoking cessation occurs in connection with situations of limited smoking 3. Maintenence of smoking cessation is related to psychological stress, and environmental cues to smoking. 4. In the smoking cessation process, adults experienced either health promotion or relapse. It is suggested that the result of this study may contributed to the development of a strategy for decreasing smoking behavior among adults.

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Optimum Culture Conditions for Hydrogen Production of Rhodopseudomonas sphaeroides (수소생산을 위한 Rhodopseudomonas sphaeroides의 최적 배양조건)

  • Kim, Jihn-Sang;Hong, Yong-Ki;Sin, Il-Sik;Cho, Hak-Rae;Chang, Dong-Suk
    • Microbiology and Biotechnology Letters
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    • v.19 no.2
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    • pp.179-185
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    • 1991
  • We examined optimum culture conditions of Rhodopseudomonas sphaeroides B5 for effective utilization of substrate and sunlight for hydrogen production. The optimum concentration range of DL-lactate as electron donor for hydrogen production by resting cells was from 5 to 50mM, and optimun CN ratio (lactate/glutamat) for maintenence of hydrogen production activity by growing cultures was from 5 to 6. Hydrogen production by the cultures of low cell density (0.36mg/ml dry cells) was saturated with 10 Klux light intensity. Under constant illumination of 50Klux which was set up as the average medium value of annual variation of sunlight intensity, hydrogen production with various cell densities in the culture resulted in highest production rate (132${\mu}$l/hr/mg dry cells) up to 0.64mg/ml dry cells. However, the amount of total hydrogen production was saturated with cell density of 2.1mg/ml dry cells. In addition to these, the optimum inner thickness pervious to light of the culture vessel for hydrogen production which was measured under sunlight was 5 cm.

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Reliability Optimization of Urban Transit Brake System For Efficient Maintenance (효율적 유지보수를 위한 도시철도 전동차 브레이크의 시스템 신뢰도 최적화)

  • Bae, Chul-Ho;Kim, Hyun-Jun;Lee, Jung-Hwan;Kim, Se-Hoon;Lee, Ho-Yong;Suh, Myung-Won
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.1
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    • pp.26-35
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    • 2007
  • The vehicle of urban transit is a complex system that consists of various electric, electronic, and mechanical equipments, and the maintenance cost of this complex and large-scale system generally occupies sixty percent of the LCC (Life Cycle Cost). For reasonable establishing of maintenance strategies, safety security and cost limitation must be considered at the same time. The concept of system reliability has been introduced and optimized as the key of reasonable maintenance strategies. For optimization, three preceding studies were accomplished; standardizing a maintenance classification, constructing RBD (Reliability Block Diagram) of VVVF (Variable Voltage Variable Frequency) urban transit, and developing a web based reliability evaluation system. Historical maintenance data in terms of reliability index can be derived from the web based reliability evaluation system. In this paper, we propose applying inverse problem analysis method and hybrid neuro-genetic algorithm to system reliability optimization for using historical maintenance data in database of web based system. Feed-forward multi-layer neural networks trained by back propagation are used to find out the relationship between several component reliability (input) and system reliability (output) of structural system. The inverse problem can be formulated by using neural network. One of the neural network training algorithms, the back propagation algorithm, can attain stable and quick convergence during training process. Genetic algorithm is used to find the minimum square error.