• 한국경영과학회지
• /
• 제12권2호
• /
• pp.36-41
• /
• 1987

This paper presents a heuristic algorithm for solving the simple facility location problem. Its main procedure is essentially of 'add' type, which progressively selects facilities to open according to a certain criterion derived from the analysis of the linear programming dual. Computational experience with test problem from the literature is presented.

• 한국경영과학회지
• /
• 제34권4호
• /
• pp.43-56
• /
• 2009

In korean peninsular, aircraft defense with SAM (Surface-to-Air Missile) is very important because of short range of combat space in depth. Effective and successful defense operation largely depends on two factors, SAM's location and the number of SAM for each target based on missile's availability in each SAM's location. However, most previous papers have handled only the former. In this paper, we developed Set covering model which can handle both factors simultaneously and Multi-heuristic algorithm for solving allocation problem of the batteries and missile assignment problem in each battery. Genetic algorithm is used to decide optimal location of the batteries. To determine the number of SAM, a heuristic algorithm is applied for solving missile assignment problem. If the proposed model is applied to allocation of SAM, it will improve the effectiveness of air defense operations.

• 산업공학
• /
• 제21권3호
• /
• pp.262-273
• /
• 2008

In Korean peninsular, Air Defense with SAM(Surface-to-Air Missile) is very important, because of threatening by North Korea's theater ballistic missiles installed with nuclear or biochemistry. Effective and successful defense operation largely depends on two factors, SAM's location and the number of SAM for each target based on missile's availability in each SAM's location. However, most previous papers have handled only the former. In this paper, we developed Multi-heuristic algorithm which can handle both factors simultaneously for solving allocation problem of the batteries and missile assignment problem in each battery. To solve allocation problem, genetic algorithm is used to decide location of the batteries. To solve missile assignment problem, a heuristic algorithm is applied to determine the number of SAM for each target. If the proposed model is applied to allocation of SAM, it will improve the effectiveness of missile defense operations.

• 산업경영시스템학회지
• /
• 제46권4호
• /
• pp.238-245
• /
• 2023

As technologies have been more quickly developed in this 4th Industry Revolution era, their application to defense industry has been also growing. With these much advanced technologies, we attempt to use Manned-Unmanned Teaming systems in various military operations. In this study, we consider the Location-Routing Problem for reconnaissance surveillance missions of the maritime manned-unmanned surface vehicles. As a solution technique, the two-phase method is presented. In the first location phase, the p-median problem is solved to determine which nodes are used as the seeds for the manned vehicles using Lagrangian relaxation with the subgradient method. In the second routing phase, using the results obtained from the location phase, the Vehicle Routing Problems are solved to determine the search routes of the unmanned vehicles by applying the Location Based Heuristic. For three network data sets, computational experiments are conducted to show the performance of the proposed two-phase method.

• 해양환경안전학회지
• /
• 제19권3호
• /
• pp.277-284
• /
• 2013

To ensure that the production system of a factory is efficient, the factory layout design should consider the location and material flow plans of facilities, workshops, and storage areas. Highly productive factories need to have an optimized layout planning process, and a customized design methodology of the production system is a necessity for feasible layout planning. This paper presents a method for designing a layout module's size and shape and provides a heuristic location-allocation algorithm for the modules. The method is implemented and validated using a rich internet application-based platform. The layout design method is based on the leisure ship production process; this method can be used for designing the layout of a new factory or remodeling an existing factory and its production system. In contrast to existing layout methods, the inputs required for the proposed method, such as target products, production processes, and human-resource plans, are simple. This layout design method provides a useful solution for the initial stage of factory design.

• Journal of Electrical Engineering and Technology
• /
• 제3권2호
• /
• pp.192-198
• /
• 2008

This paper proposes a FRTU-based intelligent fault distance determination strategy in which each FRTU is able to avoid multiple estimations and reduce the level of estimation error by utilizing heuristic rules driven by voltage and current information collected by 1:1 communication with other FRTUs from the same zone in a ubiquitous-based distribution system. In the proposed method, each FRTU, at first, determines a fault zone and a fault path on the faulted zone based on the proposed heuristic rules which use its current data and the voltage data of its neighboring FRTUs as input data. Next, it determines the fault distance from its position based on the fault current estimated from the current data of the neighboring FRTUs. Finally, in order to prove the effectiveness of the proposed method, the diverse fault cases are simulated in several positions of the typical distribution system using the EMTP.

• 산업경영시스템학회지
• /
• 제30권3호
• /
• pp.44-53
• /
• 2007

Forming central warehouses for a number of stores can save costs in the continuous review inventory model due to economy of scale and information sharing. In this paper, transportation costs are included in this inventory model. Hence, the tradeoff between inventory-related costs and transportation costs is required. The main concern of this paper is to determine the number and location of central warehouses. Transportation costs are dependent on the distance from several central warehouses to each store. Hence, we develop an efficient simulated annealing algorithm using distance-based local search heuristic and merging heuristic to determine the location and the number of central warehouses. The objective of this paper is to minimize total costs such as holding, setup, penalty, and transportation costs. The performance of the proposed approach is tested by using some computational experiments.

• 대한교통학회지
• /
• 제26권3호
• /
• pp.145-153
• /
• 2008

본 연구에서는 천연가스버스 충전소 위치 선정의 객관성과 효율성을 확보하기 위한 노력의 일환으로 공간적 접근성과 통행 비용을 고려한 천연가스 충전소 입지선정 모형을 개발하였다. 본 연구에서 제시한 충전소 입지선정 모형은 고정식 충전소를 대상으로 하였으며, 2단계로 구성되었다. 1단계에서는 천연가스버스의 노선 기종점으로부터 이동거리 제약조건을 만족하는 충전소 입지 대안들을 Heuristic Algorithm을 통해 선정하였으며, 모형의 2단계에서는 변형된 Transportation Problem을 이용하여 충전소 입지대안별 최소 통행비용을 산출하고 이를 충전소의 설치 및 운영비용과 비교분석하여 충전소 최적 입지대안을 도출하였다. 본 모형의 적용가능성 분석을 위해 수도권내의 대표적 중소도시인 안양시를 대상으로하여 천연가스버스 수요량에 따른 충전소의 입지와 규모를 산출하였다. 본 연구를 통해 객관적이고 합리적인 천연가스 충전소 입지선정 방법론의 기틀을 제시함으로써 향후 천연가스버스의 원활한 보급에 기여할 수 있을 것으로 판단된다.

• 한국항해항만학회지
• /
• 제35권8호
• /
• pp.657-665
• /
• 2011

본 연구는 수직 배치형 컨테이너 터미널에서 반입되는 수출 컨테이너의 작업순서와 장치위치를 결정하는 통합 문제를 다루었다. 수출 컨테이너에 대한 선호 장치위치는 대응하는 본선작업의 우선순위와 밀접하고 외부 트럭들의 대기시간은 장치 소요시간에 좌우된다. 본 연구는 외부 트럭들의 예정도착시간과 예정완료시간 그리고 적하작업의 선호 장치위치를 고려한 혼합정수모형을 제시하였다. 그리고 현장 적용을 위해 시뮬레이티드 어닐링에 기반한 휴리스틱 알고리즘을 개발하였다. 목적 함수값과 계산시간의 관점에서 최적 모형과 휴리스틱 알고리즘을 비교하였고 수치실행을 통해 휴리스틱 알고리즘의 수행도를 분석하였다.

• Asia pacific journal of information systems
• /
• 제29권3호
• /
• pp.468-488
• /
• 2019

As the growth of online travel agencies (hereafter OTAs) accelerates, competition among hotels to gain exposure on the first page of OTA websites, and the financial burden, such as commissions hotels have to pay in return, are increasing. Therefore, to facilitate successful management in the tourism industry, it is important to establish what makes people continue the practice of using OTAs to book rooms in hotels and other accommodation outlets. By adopting the heuristic-systematic model (HSM), this study explores the factors that drive consumers' continued use of OTA and classifies them into heuristic cues (brand awareness, cost saving, and scarcity message) and systematic cues (recommendation quality and the ability to provide reputation). Furthermore, we divided the sample based on the location of hotels within and outside Korea, and investigated the different roles of the cues between two models. The results are expected to provide theoretical and practical implications for both OTAs and hotels.