• Title, Summary, Keyword: 동류전용

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A Simulation Analysis of R.O.K Navy's Inventory Management Model for Repairable Parts (시뮬레이션을 통한 해군의 복구성 수리부속 재고관리 모형 개발에 관한 연구)

  • Kim, Sungpil;Park, Sunju;Chung, Yerim
    • Journal of the Korea Society for Simulation
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    • v.22 no.1
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    • pp.31-40
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    • 2013
  • Recent development in science and technology has modernized the weapon systems of ROKN (Republic Of Korea Navy). Although the cost of purchasing, operating, and maintaining the cutting-edge weapon systems has been increased significantly, the national defense expenditure is under a tight budget constraint. In order to maintain the availability of ships with low cost, we need an efficient and scientific method for managing repairable parts. In this study, we propose a simulation model that computes the availability of ship's repairable parts. Our model is based on the METRIC (Multi Echelon Technique Repairable Item Control) model and extends to five sub-models to reflect the realistic situations that arise in the navy, such as planned maintenance, condemnation, lateral transshipment, and cannibalization. We have performed simulations to compute the availability of repairable parts while setting the part-level consistent throughout the five models and carried out two sensitivity analyses. The simulation results show the differences in the part availability in different models. The experiments confirm our claim that ROKN needs an inventory management system that captures the operational characteristics of the navy.

A study on the PBL Application Scheme for Optimal Maintenance of the KF-X Project (한국형전투기(KF-X)의 최적정비를 위한 PBL 적용방안에 관한 연구)

  • Park, Keun-Seog;Yoo, Yong-Hyun
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.24 no.3
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    • pp.10-18
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    • 2016
  • This paper deals with the Performance Based Logistics(PBL) application scheme pertaining to optimal maintenance program for logistics of Korean Fighter Experimental(KF-X) Project. For enhancement of the performance based logistics system application to KF-X program the selection of appropriate standards fit to maximize cost-cutting, a set of performance metrics fit for the purpose of the contract, foreign technology dependence of core equipments and parts were considered. Thus, selecting appropriate standards fit for Korean logistics environment, domestic maintenance enterprise for stable rate of operation of KF-X, a systematic reliability task that is able to measure quantitative combat capability are suggested.

Provisioning Quantity Determination of Repairable Concurrent Spare Part under Budget Constraint and Cannibalization Allowed (자금제약하에서 동류전용이 허용될 때 수리가능한 동시조달부품의 적정소요량 결정)

  • Oh, Geun-Tae;Na, Yoon-Kyoon
    • Journal of Applied Reliability
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    • v.12 no.3
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    • pp.225-238
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    • 2012
  • In this paper determined is the quantity of repairable concurrent spare parts(CSP) of a new equipment system to maximize the operational availability under budget constraint and cannibalization allowed. When a part fails, the part is replaced and the failed part is repaired for later use while cannibalization is allowed. The failure of a part is assumed to follow a Poisson process and the availability in CSP is defined. The solution procedure consists of two parts. Firstly, a mathematical model is developed under the assumption that the failure rate is constant during the CSP period and cannibalization is not allowed. Secondly, proposed is a simulation search procedure which improves the heuristic solution to the near optimal solution in a reasonable amount of time under the assumption that the cannibalization is allowed.

Provisioning Quantity Determination of Consumable Concurrent Spare Part Under Availability Constraint and Cannibalization Allowed (운용가용도 제약하에서 동류전용이 허용될 때 소모성 동시조달부품의 적정구매량 결정)

  • Oh, Geun-Tae;Na, Yoon-Kyoon;Kim, Myung-Soo
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.33 no.3
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    • pp.199-207
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    • 2010
  • In this paper considered is the provisioning quantity determination problem of consumable concurrent spare parts (CSP) of a new equipment system to minimize the procurement cost under the operational availability constraint. When a part fails, repair of the failed part is impossible and the part is replaced and cannibalization is allowed. The failure of a part is assumed to follow a Poisson process and the operational availability in CSP is defined. The solution procedure consists of two parts. Firstly, a heuristic algorithm is developed under the assumption that the failure rate is constant during the CSP period. Secondly, proposed is a simulation search procedure which improves the heuristic solution to the near optimal solution in a reasonable amount of time. An illustrative example is shown to explain the solution procedure.

A Study on the Operational Method of Urban Arterial With U-Turn (U-Turn을 이용한 간선도로 운영방안)

  • 박용진;손한철
    • Journal of Korean Society of Transportation
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    • v.18 no.1
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    • pp.17-26
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    • 2000
  • U-turns are allowed widely at the intersections by local police department while the left-turn Phases have been gradually Prohibited. However, any strategies for U-turn movements at signalized intersections are unavailable. Therefore, the Purpose of this study is to Propose the efficient operational method of Urban arterial adopting U-turn strategies. Four alternatives are evaluated they are, 1) U-turn movements are allowed at the adjacent intersection with exclusive U-turn lane while the major or the minor approach is Prohibited, 2) U-turn movements are allowed at the adjacent mid-block Pedestrian crossing with exclusive U-turn lane while the major approach is Prohibited. 3) U-turn movements are allowed at the adjacent mid-block Pedestrian crossing with exclusive U-turn lane while the minor approach is prohibited and 4) Comparative one between alternative 3 and 4. From the results of this study, it concludes that the method of U-turn movements allowed at the adjacent mid-block pedestrian crossing with exclusive U-turn lane is the most effective strategy among those alternatives. The strategies of alternative 1 and 4 are Proposed by the boundary based on the major through and left-turn volumes and the minor left-turn volume.

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