• 산업경영시스템학회지
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• 제46권4호
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• pp.160-172
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• 2023

In contemporary global warfare, the significance and imperative of air transportation have been steadily growing. The Republic of Korea Air Force currently operates only light and medium-sized military cargo planes, but does not have a heavy one. The current air transportation capability is limited to meet various present and future air transport needs due to lack of performance such as payload, range, cruise speed and altitude. The problem of population cliffs and lack of airplane parking space must also be addressed. These problems can be solved through the introduction of heavy cargo planes. Until now, most studies on the need of heavy cargo plane and increasing air transport capability have focused on the necessity. Some of them suggested specific quantity and model but have not provided scientific evidence. In this study, the appropriate ratio of heavy cargo plane suitable for the Korea's national power was calculated using principal component analysis and cluster analysis. In addition, an optimization model was established to maximize air transport capability considering realistic constraints. Finally we analyze the results of optimization model and compare two alternatives for force structure.

• 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.

• 산업공학
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• 제20권2호
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• pp.204-215
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• 2007

This paper addresses vehicle routing planning in freight container transportation systems where a number of loaded containers are to be delivered to their destination places. The system under consideration is static in that all transportation requirements are predetermined at the beginning of a planning horizon. A two-phased procedure is presented for freight container transportation. In the first phase, the optimal model is presented to determine optimal total time to perform given transportation requirements and the minimum of number of vehicles required. Based on the results from the optimal model, in the second phase, ASA(Accelerated Simulated Annealing) algorithm is presented to perform all transportation requirements with the least number of vehicles by improving initial vehicle routing planning constructed by greedy method. It is found that ASA algorithm has an excellent global searching ability through various experiments in comparison with existing methods.

• 안보군사학연구
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• 통권9호
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• pp.313-340
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• 2011

The National Defense Reformation bill of "National Defense Reformation 2020" which have been constantly disputed and reformed by the government went through various levels of complementary measures after the North Korean sinking on the Republic of Korea (ROK) Naval Vessel "Cheonan". The final outcome of this reform is also known as the 307 Plan and this was announced on the 8th March. The reformed National Defense Reformation is to reduce the number of units and military personnel under the military structure reformation. However, in order for us to undertake successful National Defense Reformation, the use of privatized civilian resources are essential. Therefore according to this theory, the ROK Ministry of National Defense (MND) have selected the usage of privatized resources as one of the main core agenda for the National Defense Reformation management procedures, and under this agenda the MND plans to further expand the usage of private Especially the MND plans to minimize the personnel resources applied in non-combat areas and in turn use these supplemented personnel with optimization. In order to do this, the MND have initiated necessary appropriate analysis over the whole national defense section by understanding various projects and acquisition requests required by each militaries and civilian research institutions. However for efficient management of privatized civilian resources, first of all, those possible efficient private resources which can achieve optimization will need to be identified, and secondly continuous systematic reinforcements will need to be made in private resource usage legislations. Furthermore, we would need to consider the possibility of labor disputes because of privatization expansion. Therefore, full legal and systematic complementary measures are required in all possible issue arising areas which can affect the combat readiness posture. There is another problem of huge increase in operational expenses as reduction of standby forces are only reducing the number of soldiers and filling these numbers with more cost expensive commissioned officers. However, to overcome this problem, we would need to reduce the number of positions available for active officers and fill these positions with military reserve personnel who previously had working experiences with the related positions (thereby guaranteeing active officers re-employment after completing active service). This would in tum maintain the standards of combat readiness posture and reduce necessary financial budgets which may newly arise. The area of maintenance, supply, transportation, training & education duties which are highly efficient when using privatized resources, will need to be transformed from military management based to civilian management based system. For maintenance, this can be processed by integrating National Maintenance Support System. In order for us to undertake this procedure, we would need to develop maintenance units which are possible to be privatized and this will in turn reduce the military personnel executing job duties, improve service quality and prevent duplicate investments etc. For supply area, we will need to establish Integrated Military Logistics Center in-connection with national and civilian logistics system. This will in turn reduce the logistics time frame as well as required personnel and equipments. In terms of transportation, we will need to further expand the renting and leasing system. This will need to be executed by integrating the National Defense Transportation Information System which will in turn reduce the required personnel and financial budgets. Finally for training and education, retired military personnel can be employed as training instructors and at the military academy, further expansion in the number of civilian professors can be employed in-connection with National Defense Reformation. In other words, more active privatized civilian resources will need to be managed and used for National Defense Reformation.

• 대한산업공학회지
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• 제41권3호
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• pp.296-304
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• 2015

Vessel Traffic Service (VTS) is the service that provides ships navigating on a sea transportation route with guidance and advice about geographical environment and other attentive information for their safety. In this study we point out that currently, constructing additional VTSs is required to prevent ships from unexpected accident on their navigation. We first select several candidate locations for constructing VTSs, based on the amount of marine transportation and its potential development possibility. Then, we present an optimization model in which the maximum area coverage is achieved by determining new locations of VTS subject to budget limitation. The problem can be modeled as a binary integer program and it provides an optimal solution for new VTS locations to be constructed under the consideration of the currently located VTSs in Korea.

• 산업공학
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• 제20권2호
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• pp.103-111
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• 2007

A heterogeneous VRP which considers various capacities, fixed and variable costs was suggested in this study. The transportation cost for vehicle is composed of its fixed and variable costs incurred proportionately to the travel distance. The main objective is to minimize the total sum of transportation costs. A mathematical programming model was suggested for this purpose and it gives an optimal solution by using OPL-STUDIO (ILOG CPLEX). A genetic algorithm which considers improvement of an initial solution, new fitness function with weighted cost and distance rates, and flexible mutation rate for escaping local solution was also suggested. The suggested algorithm was compared with the results of a tabu search and sweeping method by Taillard and Lee, respectively. The suggested algorithm gives better solutions rather than existing algorithms.

• 항공우주시스템공학회지
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• 제12권2호
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• pp.23-29
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• 2018

비행운은 항공기가 차가운 대기를 비행할 때 엔진 배기의 수증기가 응축하여 발생하는 구름을 말한다. 비행운은 지구 온난화의 원인중 하나로 지목되고 있으며 군사적으로는 항공기 스텔스 기술과 연관되어 있으므로, 이를 저감하기 위한 관련 연구가 진행되었다. 그러나 우리나라의 경우 관련 연구가 전혀 진행되지 않은 실정이므로, 연구 수행을 위한 기초자료로써 선진국의 비행운 저감 기술 사례를 집중적으로 분석할 필요가 있다. 본 논문에서는 선진국에서 수행되었던 비행운 저감 기술 동향을 카테고리 별로 파악하고, 제시된 각 기술들의 타당성과 실현 가능성을 분석하였다. 또한 관련 기술의 적용 및 상용화를 위한 방향을 제안하였다.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2017년도 공동학술발표회
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• pp.1-1
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• 2017

• 한국기계가공학회지
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• 제20권8호
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• pp.1-10
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• 2021

Gears, which rotate and transmit power by interlocking two cogwheels, were invented in BC. They have been used in various systems, including industrial machinery, transportation devices, and living facilities, through the industrial revolution. Regardless of how they are used, gears are a major source of noise and vibration. Many effective measures are being taken to reduce the radiation noise generated from gears, most commonly by lubrication. Lubrication in gear units reduces friction on interlocking gear surfaces, dampening radioactive noise. This can be very useful for quiet gear design if these lubricating damping effects can be reflected in the analytical phase for gear design. This study experimentally confirms the properties of lubricated and non-lubricated radioactive noise by designing a decelerator gearbox and analyzing the radioactive noise characteristics by torque, rotation, and the number of gears using computer analysis.

• 인터넷정보학회논문지
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• 제23권6호
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• pp.27-37
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• 2022

디지털 통신 환경 기술이 다양화되고 네트워크 이용 접근성이 높아지고 있으며 보안이 중요한 방산업체, 국방 관련 기관 등 국가의 안보에 관련된 다양한 환경에서 가상 사설망 서비스를 사용한다. 하지만 기술에 발전에 따라 매년 가상 사설망의 취약점을 통한 공격이 증가하고 있다. 본 논문은 가상 사설망에서 발생 가능한 잠재적 취약점 및 신규 취약점에 대해 대비하기 위해 STRIDE 위협 모델링을 통해 보안 요구사항을 도출하였다. STRIDE 위협 모델링은 위협을 총 6가지 범주로 그룹화 위협을 체계적으로 식별한다. 이를 적용하기 위해 가상 사설망의 기능을 분석하고 가상 사설망 서비스가 이루어지는 동안의 자료 흐름도를 생성하였다. 그 후, 가상 사설망에서 발생 가능한 위협을 수집하고 이를 기반으로 STRIDE 위협 모델링을 분석했다. 생성한 가상 사설망의 자료 흐름도는 총 96개의 STRIDE 위협으로 분류되며, 실제 취약점 리스트와 비교 분석하여 분류 결과를 구체화했다. 그 후 위협들의 공격 루트를 파악하기 위해 위협 시나리오를 작성했다. 본 논문은 작성된 시나리오를 기반으로 가상 사설망의 구성요소에 따른 총 30개의 보안 요구사항을 도출했다. 본 논문을 통해 국방부와 같이 보안이 중요한 시설에서 사용하는 가상 사설망의 보안 안정성을 높일 수 있는 보안요구사항을 제시한다.