• Title/Summary/Keyword: 수리순환부품

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A study on Improving Operation Efficiency of LCC through Parts Pooling (부품공유를 통한 저가항공사의 효율성 향상 방안 연구)

  • Choi, Se-Jong
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.23 no.1
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    • pp.120-125
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    • 2015
  • Passengers and Airlines wish neither delay nor cancellation due to aircraft defects. However, about 1 delay or cancellation case occurs out of 100 departures worldwide whereas 1 quarter case does in Korean domestic industry. Independent LCC carriers in Korea have almost double case. Most cases are recovered by replacing aircraft components. Airlines have prepared the spare components based on the reliability data by manufacturers to rectify defects or perform preventive maintenances. The total value for initial spares including engine is 40% of the aircraft price when they operate less than 5 aircraft. The more airlines operate the aircraft, the less the ratio of the investment for spares reflecting the economy of scale. This study intends to suggest how to improve the efficiencies as well as the safety of LCC throughout parts pooling including engines.

Optimal Provisioning Quantity Determination of Concurrent Spare Parts including Consumable Items and Repairable Items under the Availability Limitation (운용가용도 제약하에서 소모성부품과 수리순환부품이 혼재된 동시조달부품의 최적구매량 결정)

  • 오근태;김명수
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.23 no.59
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    • pp.53-67
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    • 2000
  • In this paper we consider the CSP requirements determination problem of new equipment(machine) system. For the newly procured equipment systems, mathematical analyses are made for the system which is constructed with the consumable parts and the repairable parts to derive the associated CSP requirement determination model in mathematical expression. Based on these analyses, a mathematical model Is derived for making an optimal CSP requirement determination subject to the constraint of satisfying any given operational availability limitation. We assume that the failure of a part follows a Poisson process and the repair time has an exponential distribution. Firstly, the operational availability concept in CSP is defined and the relation between the general system availability and the operational availability is established. Secondly, the problem is formulated as the cost minimization problem that should satisfy the operational availability limitation, and then, using the generalized Lagrange multipliers method, the optimal solution procedure Is derived.

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Environmental Evaluation for the Remanufacturing of Rental Product Using the LCA Methodology (LCA기법을 이용한 랜탈 재제조품의 환경성 평가)

  • Kwak, In-Ho;Hwang, Young-Woo;Park, Kwang-Ho;Park, Ji-Hyoung;Seol, So-Young;Shin, Hwa-Jeong;Yang, Eun-Hyeok;Min, Gon-Sik
    • Journal of Korean Society of Environmental Engineers
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    • v.38 no.11
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    • pp.611-617
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    • 2016
  • Remanufacturing that is the rebuilding of a product to specifications of the original manufactured product by collecting used-product, completely disassembling, cleaning and repairing or replacing with a new part and reassembling has been received attention in aspects of resource, recycling because it is a great environmental improvement. Remanufacturing is the rebuilding of a product to specifications of the original manufactured product by collecting used-product, completely disassembling, cleaning and repairing or replacing with a new part and reassembling. With a great environmental improvement and resource recycling and conservation, many studies were conducted. Up to date, remanufacturing activities are mainly applied to automobile parts and printer toner cartridge in South Korea. However, remanufacturing of rental product is not well conducted although rental products are collected in good condition and could be remanufactured in the same condition as a new product. Therefore, in this study, we conducted life cycle assessment (LCA) to an air cleaner product that is one of rental products. This study attempts to identify the processes in new products and remanufacturing life cycles that contribute the most environmental impacts. The results show that air cleaner remanufacturing could reduce about 20% of environmental impacts compared to new product. The greatest benefit related to environmental impact is with regard to ozone layer depletion potential (ODP), which is reduced by 94%. In the life cycle of air cleaner, raw material extraction stage had the most environmental impacts, especially with regard to abiotic depletion potential (ADP) and global warming potential (GWP). In the environmental impacts in each part, the ABS power had the highest environmental impacts.