• 한국IT서비스학회지
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• 제17권4호
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• pp.21-35
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• 2018

This study reconstructed the military logistics improvement project currently being implemented by ROK military as a defense logistics strategy. In addition the factors affecting the performance of the defense logistics strategy are analyzed using PLS. The significance of this study is as follows. First, the defense logistics improvement project was structured as a defense logistics strategy according to function. Second, PLS is used for performance factor analysis. Most of the existing defense researches utilized the ML structural equation. However, this study used the PLS structural equation in view of the fact that each detail project is the formation of defense logistics strategy. Third, we identified projects that have a substantial impact on defense logistics performance and those that do not. We found that inventory, process, and information strategy influenced logistics performance among defense logistics strategies. On the other hand, it was confirmed that the facility/equipment strategy had no significant effect on defense logistics performance.

• Nano
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• 제13권11호
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• pp.1850126.1-1850126.10
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• 2018

Flexible strain sensors, as the core member of the family of smart electronic devices, along with reasonable sensing range and sensitivity plus low cost, have rose a huge consumer market and also immense interests in fundamental studies and technological applications, especially in the field of biomimetic robots movement detection and human health condition monitoring. In this paper, we propose a new flexible strain sensor based on thick CVD graphene film and its low-cost fabrication strategy by using the commercial adhesive tape as flexible substrate. The tensile tests in a strain range of ~30% were implemented, and a gage factor of 30 was achieved under high strain condition. The optical microscopic observation with different strains showed the evolution of cracks in graphene film. Together with commonly used platelet overlap theory and percolation network theory for sensor resistance modeling, we established an overlap destructive resistance model to analyze the sensing mechanism of our devices, which fitted the experimental data very well. The finding of difference of fitting parameters in small and large strain ranges revealed the multiple stage feature of graphene crack evolution. The resistance fallback phenomenon due to the viscoelasticity of flexible substrate was analyzed. Our flexible strain sensor with low cost and simple fabrication process exhibits great potential for commercial applications.

• 한국전자거래학회지
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• 제3권1호
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• pp.43-67
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• 1998

Logistics is by no means a new subject area. The concept of logistics goes way become more complex as technology advances, and logistics requirements have increased accordingly. In 1964, when ILS philosophy formally came into being, ILS was defined in general terms and did not describe what actions an ILS program should accomplish. ILS philosophy have been developed from 1964 through 1980. In 1982, United States Department of Defense formulated a new concept, CALS. CALS is the strategy that the US defense development to management the transition to integration and automated interchange in defense system engineering, manufacturing, and logistic support. Its goal is to use the inherent features of digitized data to revolutionize the function of data -gathering, data storage and data - transfer techologies associared with the development of defense systems. The Result will be systems that are cheaper, more reliable, and easier to maintain. To define CALS's character, the purpose of this papers compare two concepts - CALS and ILS. The elements of CALS consist of standads and EDI. The elements of ILS include LCC(Life Cycle Cost), LSA(Logistics Support Analysis), LSAR(Logistics Support Analysis Rcord), Aquisition Cycle.

• 산업공학
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• 제20권3호
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• pp.363-375
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• 2007

Under the fast technology changes and budget constraints, the organizations related to national defense face increased demands to develop innovative strategy and methodology to maximize performance with drastically reduced cost. In this context, the management of innovation and change in the defense acquisition area is vital to the Ministry of National Defense, related organizations and industries. In this paper, we discuss three comprehensive innovation strategies and methodologies for the defense acquisition area preparing for next-generation warfare; EVMS (earned value management system), PBL (performance based logistics) and SBA (simulation based acquisition). These collaborating innovative efforts enable us to tackle defense challenges for government and industries with a flexible and optimistic approach that maximizes productivity and performance with minimum cost.

• 산업공학
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• 제25권2호
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• pp.153-162
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• 2012

The reliability is defined as a probability that a system will operate properly for a specified period of time under the design operating conditions without failure and it has been considered as one of the major design parameters in the field of industries. Reliability-Redundancy Optimization Problem(RROP) involves selec tion of components with multiple choices and redundancy levels for maximizing system reliability with constraints such as cost, weight, etc. However, in practice both active and cold standby redundancies may be used within a particular system design. Therefore, a redundancy strategy(active, cold standby) for each subsystem in order to maximize system reliability is considered in this study. Due to the nature of RROP, i.e. NP-hard problem, A Parallel Particle Swarm Optimization(PPSO) algorithm is proposed to solve the mathematical programming model and it gives consistently better quality solutions than existing studies for benchmark problems.

• 한국국방경영분석학회지
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• 제18권2호
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• pp.1-22
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• 1992

Computer-aided logistics support system is recognized an essential system to reduce supply and maintenance cost, and to improve readiness of weapon system or operationable composite machines. According to these trends, this paper focuses on the design scheme and the computerization strategy of information management system for Integrated Logistics Support (ILS) work. Suggested system. LAMIS(Logistics support Analysis Management Information System) is a total system that composed of Logistics Support Analysis Management information system (LSAM), Configuration Management Information System (CMIS), Maintenance Management Information System (MMIS), Project Management System (PMS) and Information Retrival System(IRS) etc. Also, LAMIS is a computerized tool that improves current supply and maintenance support program, that attempts to reliable requirment analysis of logistics support elements, and that supports to use the existing technical specification of similar one when weapon system acquisition project is started newly. When LAMIS implication is completed, it can be applied to logistics support of defense or commercial site. Straightway, LAMIS will be enhanced with computer - aided design system, engineering drawing system, interactive electronic technical manual system, electronic data interchange system, and three dimensional simulation system to weapon system configuration. When that is done, LAMIS is CALS system.

• 한국전자거래학회지
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• 제24권3호
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• pp.111-128
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• 2019

현재 우리 군의 군수품 조달은 육 해 공군이 개별 보급단, 군지사 및 보급창을 중심으로 구성된 물품 조달 체계를 통해 이루어지고 있다. 특히, 납품업체로부터 사용부대까지는 직납의 형태로 배송하고 있어 규모의 경제를 실현하는 데 한계가 있다. 생산원가를 포함한 여러 비용 중 운송비용은 일반관리비용 중 하나로 정의되고, 연 단위 일괄 계약 방식으로 운영된다. 이로 인해 실제 납지 기준의 현실적인 운송비용이 산정될 수 없어 국방 예산 집행의 효율성을 확보하기 어려운 상황이다. 또한, 각 군이 개별적인 조달 체계를 운영하고 있어 유사 시 빠르고 유연하게 대처할 수 없다는 문제점을 가지고 있다. 따라서 본 연구에서는 국방 수송 분야에 민 군 통합 수송 체계를 구축하여 운영의 효과를 이미 검증한 미군의 DTCI(Defense Transportation Coordination Initiative)를 조직구성과 운영 방식 관점에 벤치마킹하고, 이를 우리 군의 운영 상황에 적합한 민 군 통합 운영 체계 수립을 위한 방안을 제안하고자 한다. 새롭게 제안되는 국방 수송 체계의 효과성을 입증하기 위해 과거 실제 납품 실적을 바탕으로 Hub & Spoke 방식을 적용하여 시뮬레이션을 수행하고, 직납 체계와 운송거리 측면에서의 정량적 비교를 수행하였다. 본 연구 결과는 우리 군의 군수품 수송 체계의 효율성을 향상시킬 수 있는 전체 계획 수립의 근거자료로 활용될 수 있을 것이다.

• 한국컴퓨터정보학회논문지
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• 제27권10호
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• pp.235-243
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• 2022

경쟁이 심화되는 글로벌 방산수출환경은 다양한 비정형적 데이터의 체계적인 분석을 통해 수출목표국가에 대한 수출유망분야를 선정한 후 수출방향에 대한 전략적 맞춤화가 필요한 시점이다. 이에 본 연구는 방산수출품목 시장확대를 목적으로 수출목표국가를 독일, 영국, 프랑스로 선정하고 해당국가별 향후 10년간 무기체계 획득계획에 대한 비정형 예측 데이터를 확보하고자 하였다. 이후 텍스트 마이닝 분석 중 TF-IDF 기법을 활용하여 3개국의 데에터에서 자주 등장하는 핵심어를 도출하고자 하였다. 분석결과, 각 국의 주요 획득사업에 대한 핵심어를 도출할 수 있었고 이를 토대로 3국의 공통적 획득계획이 있는 핵심어를 유사한 의미로 분류하여 현 시점의 방산수출에 대한 유망수출품목을 발굴할 수 있었다.

• Management Science and Financial Engineering
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• 제19권1호
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• pp.1-10
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• 2013

Hierarchical forecasting strategy does not always outperform direct forecasting strategy. The performance generally depends on demand features. This research guides the use of the alternative forecasting strategies according to demand features. This paper developed and evaluated various classification models such as logistic regression (LR), artificial neural networks (ANN), decision trees (DT), boosted trees (BT), and random forests (RF) for predicting the relative performance of the alternative forecasting strategies for the South Korean navy's spare parts demand which has non-normal characteristics. ANN minimized classification errors and inventory costs, whereas LR minimized the Brier scores and the sum of forecasting errors.

• 정보화연구
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• 제10권2호
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• pp.181-195
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• 2013

본 연구는 육군 장비정비정보체계의 사용에 영향을 미치는 요인을 실증하는 것이다. 선행연구의 검토를 통해 분해된 계획행동이론(DTPB: Decomposed Theory of Planned Behavior)이 군과 같은 비자발적 환경에서 정보체계 사용의도를 파악하는데 적절한 모델로 판단하였으며, 분해된 계획행동이론을 기반으로 연구모형을 구성하였다. 설문조사는 육군 장비정비정보체계를 사용하는 266명의 군인 및 군무원을 대상으로 실시하였으며, 자료 분석은 통계 패키지인 SPSS와 AMOS를 사용하였다. 연구결과 지각된 유용성과 사용 용이성은 태도에 영향을 미치지 못하는 것으로 나타났다. 동료와 상관의 영향은 주관적 규범에 유효하였으며, 자기 효능감은 지각된 행동통제에 영향을 미치는 것으로 나타났다. 본 연구의 결과는 장비정비정보체계의 사용을 촉진하고 향후 개발 전략에 기여할 것으로 판단된다.