• 한국신뢰성학회지:신뢰성응용연구
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• 제18권2호
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• pp.143-152
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• 2018

Purpose: In this paper, we propose calculation methods of Maintenance Float (M/F). Results of each method are compared and verified by using commercial tool (OPUS Suite). As modern weapon systems become more expensive, we need to find the most economical and efficient method to achieve the target operational availability (Ao). Methods: Three kinds of methods (Considering the number of CSP, Applying the Poisson distribution, and Applying M&S Tool) are used to find the number of M/F. Three methods (Considering the number of CSP, Applying the Poisson distribution, and Applying M&S Tool) were used to estimate the required number of M/F. The analysis results were verified by SIMLOX. The cost of equipment calculated by each analysis method was compared and the cause of the difference was analyzed. Conclusion: Ao and cost must be considered to find the optimal number of M/F. In general, it costs more to increase availability. But the cost is not necessarily proportional to Ao. Therefore, it is better to compare the calculation method and determine the final MF quantity.

• 한국신뢰성학회지:신뢰성응용연구
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• 제16권3호
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• pp.192-201
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• 2016

Purpose: In this paper, we propose the output model of the optimal inventory requirements of the Maintenance Float (M/F). Weapon systems were modernized and increased costs. Thus, the complexity increases with. Alternatives to achieve the goal of availability of weapon systems and to reduce life-cycle cost are required. Especially, securing spare parts is more effective than adding the amount of equipment or maintenance facilities to achieve the goal of availability and reduce life cycle costs. However, securing spare parts and repair costs are directly related, so exact requirements are needed. Methods: Three kinds of methods (Calculation method of applying the Poisson distribution, Calculation method of considering the number of CSP, and Calculation method of applying M&S program) that this paper proposed compare the influence of the availability and the amount of spare parts. Result: We calculate the cost of M/F when the operational availability is over than 80% and compare that result. The biggest cost was calculated from the Poisson distribution method. We found that requirements and unit price is the key factor that gives a significant effect. Conclusion: These three kinds of methods can be used as a basis for Maintenance Float calculation. Among them, the calculation method based on CSP is optimal replacement equipment requirements calculation method.

• 한국국방경영분석학회지
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• 제34권2호
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• pp.163-174
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• 2008

군은 신뢰도(Reliability)나 가용도(Availability)가 다른 어떤 조직보다 중요한 조진이다. 최근에는 시스템 준비태세(System Readiness)를 강조하며, 무기체계의 성능뿐 아니라 가용도를 중요한 성과 목표로 정의하고 있어 이런 경향은 심화되고 있다. 이런 맥락에서, 군의 중요한 설비나 장비들은 신뢰도(Reliability)와 가용도(Availability) 제고를 위해 만약의 경우를 대비하는 여유 장비를 운용하고 있다. 이를 정비대충장비(M/F Maintenance Float, 이하 M/F) 라고 한다. 군의 정비대충장비는 매년 장비의 수량과 가동률을 적용하여 소요량을 산출하고 있으나, 기존의 방법은 고장특성과 정비부대의 정비능력에 대한 고려가 미흡하여, M/F 도입에 따른 효과인 신뢰도와 가용성 제고를 원래 의도된 목표만큼 달성하지 못하고 있다. 본 연구에서는 대기행렬이론과 흡수 마코프체인을 활용하여, M/F 재고 수준 결정을 위한 분석 모형을 제시하고, 그 결과를 활용하여 역습부대역할을 수행하는 OO부대에서 운용되고 있는 K-1 전차의 운영유지 대풍장비의 최적 수량을 산출했다. 본 연구는기존 연구에 비해 이해가 용이한 (Tractable) 방법론을 활용하면서도 M/F 수준과 관련된 의사결정을 정교하게 묘사할 수 있는 모형을 제시했다는 점에서 의의가 있다.