• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2003년도 춘계학술대회
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• pp.1-5
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• 2003

We purpose a decision model to select the optimal facilities for the Decision Making problems with multiple characteristics(nominal-is-best characteristics, larger-is -better characteristics, smaller- is -better characteristics). Using this model, concept of the loss function is used in this comprehensive method of for select the optimal preferred facilities. To solve the issue on the optimal preferred facilities for multiple characteristics, this study propose the loss function with cross-product terms among the characteristics and derived range of the coefficients of the terms.

• 디지털콘텐츠학회 논문지
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• 제18권1호
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• pp.197-202
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• 2017

본 연구에서는 한국의 공연시설에 대한 현황을 분석하고 개선해야 할 과제를 도출하였다. 분석결과 한국의 공연시설은 서울지역에 지나치게 편중되어 있고 지방의 경우 면적대비 공연시설이 부족하여 거주자들의 접근성이 매우 낮은 것으로 나타났다. 본 연구에서는 이러한 문제를 해결하기 위한 방법으로 공연시설의 적정배치를 위한 시스템개발방안을 제시하였다. 또한 본 연구의 최종적인 목적은 공연시설의 가동률 및 재정자립도를 향상시키는 것이므로 적정 공연유형을 산출하는 시스템에 대한 개발방안도 함께 제시하였다. 다음은 요약문 입니다.

• 한국경영과학회지
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• 제6권1호
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• pp.5-13
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• 1981

This paper considers a facility moving along a route of straight line to serve several facilities in xy plane. A route is obtained which minimizes the objective function expressed in terms of average rectilinear distance between the service facility and facilities to he served. The forms of the objective functions can be classified into several cases according to the initial and end points of the routes. In some cases, as in the problem of optimal location of new facility, the cordinates of the optimal routes are median of the cordinates of facilities to be served. In others, the optimal routes are obtained after examining the values of objective functions on the boundaries of slopes and intercepts. An overall optimal route is obtained by comparing these routes. The entire procedure has been programmed in BASIC language, and several case examples are given.

• Industrial Engineering and Management Systems
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• 제8권4호
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• pp.221-227
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• 2009

There are customer services jointly provided by two facilities so that each customer will complete the course made up of both facilities' sub-services. The two facilities are assumed invested respectively by an infrastructure owner and one subordinate facility owner, whose partnership is built on their capital investments. This paper presents a mathematical model of Stackelberg competition between the two facility owners to derive their optimal Nash equilibrium. In this study, each facility owner's profit is consisted of fixed revenue fractions of sold services, operating costs (including depreciation cost) and maintenance costs of her facility. The maintenance costs of one facility are incurred both by failures and deterioration due to usage. Moreover, for both facilities, failures are rectified immediately by minimal repairs and preventive maintenance is carried out at a fixed time epoch. Additional assumptions are also employed to develop the model such as customer arrivals are manipulated to follow a Poisson process, and each facility's lifetime is independently Weibull-distributed. The Stackelberg game proceeds as follows. At the first stage of decision making process, the infrastructure owner (acting as a leader) decides the allocation of revenue shares based on her self-interest. After observing the allocation of revenue shares, the subordinate facility owner determines her own optimal price of services. This paper investigates actions and reactions of the two partners in the system. Then analytical conditions are proposed to achieve a unique optimal Nash equilibrium. Finally, some suggestions for further research are discussed.

• 지역연구
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• 제8권2호
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• pp.1-9
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• 1992

One of the problems associated with the current system of land development projects implemented by the public sector in Korea is that various service facilities are not ready in time for the occupation of residential dwelling. A major cause of the problem is the lack of financial arrangements which would smooth the cash-flow of the suppliers of the facilities during the project period. In this paper we present two schemes which will contribute to the optimal provision of service facilities by easing the financial constraint facing the land developers and suppliers of the facilities. The first scheme involves channeling a fraction of profits from a land development project and of the proceeds of mandatory sales of Type II National Housing Bonds as a loan to the suppliers of the service facilities. The second scheme considers the participation of the private sector in the project as a member of a consortium comprising the Korea Land development Corporation, the National Housing Fund, and private developers. It is proved that each scheme is superior to the current system. as well as entailing a very small cost.

• 교육시설
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• 제14권2호
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• pp.101-104
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• 2007

• 지적과 국토정보
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• 제49권2호
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• pp.109-122
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• 2019

맞벌이 가구의 증가로 육아에 대한 사회적 관심이 커지고 있다. 특히 자녀의 초등학교 입학은 상대적으로 이른 하교시간 때문에 돌봄의 공백이 생겨 출산과 더불어 여성의 경력단절에 주된 원인으로 꼽힌다. 본 연구는 이러한 정책적 기조에 부합하여 초등학생 대상 돌봄시설의 최적 입지선정 방안을 제안하였다. 돌봄시설의 후보로 기존 아이돌봄시설을 대상으로 하였으며, 최적입지 선정 시 수리적 최적화뿐만 아니라 입지적 특성을 고려하는 이중구조의 평가방법을 사용하였다. 실험은 서울시 송파구를 대상으로 진행하였으며, 총 258개의 후보시설 중 36개의 최적입지를 선정하였다. 먼저 공공데이터를 활용하여 돌봄시설의 특성에 맞는 평가기준을 세운 후 입지점수를 매겨 이에 해당하는 1차 후보시설을 선별하였으며, 이때 다양한 공공데이터를 하나로 통합하기 위하여 격자리샘플링 방법을 사용하였다. 다음으로 선별된 시설을 대상으로 공간 최적화 모델인 p-median 방법을 활용하여 최종 돌봄시설을 선정하였다. 이렇게 선정된 결과는 총 거리를 고려한 위치적 최적해 일뿐 아니라 돌봄시설의 특성을 고려한 다양한 입지적 기준을 만족하는 값이다. 본 연구에서 제안한 방법을 통해 공공데이터 융합 및 활용도를 높일 수 있고, 공공시설 최적입지 선정 시 정책 의사결정에 도움을 줄 것으로 기대한다.

• 전기학회논문지
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• 제65권6호
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• pp.979-986
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• 2016

At present, electric power industry around the world are being gradually changed to a new paradigm, such as electrical energy storage system, the wireless power transmission. Demand for ESS, the core technology of the new paradigm, has been growing worldwide. However, it is essential to estimate the optimal capacity of ESS facilities for frequency regulation because the benefit would be saturated in accordance with the investment moment and the increase of total invested capacity of ESS facilities. Hence, in this paper, the annual optimal mathematical investment model is proposed to estimate the optimal capacity and to establish investment plan of ESS facility for frequency regulation. The optimal mathematical investment model is newly established for each season, because the construction period is short and the operation effect for the load by seasons is different unlike previous the mathematical investment model. Additionally, the marginal operating cost is found by new mathematical operation model considering no-load cost and start-up cost as step functions improving the previous mathematical operation model. ESS optimal capacity is established by use value in use iterative methods. In this case, ESS facilities cost is used in terms of the value of the beginning of the year.

• 교육시설
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• 제12권1호
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• pp.14-28
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• 2005

Functional school planning has long been considered a fundamental concept of school design. However. in planning educational facilities, it is also important to include the dimensions of comfort, convenience and healthfulness. The school lavatories and drinking fountains are one of most crucial elements for the recent changing face in healthful school design, but the number of lavatories and drinking fountains in most schools may not be sufficient to meet current needs. This study aims to suggest a guideline in designing school sanitary fixture and propose the optimal number of lavatories and drinking fountains regarded to age and sex. The survey is conducted through questionnaires collected from 998 respondents including 300 teachers In ChungNam province. Based on the results of the survey and a formulae, it is suggested that the number of lavatories be required by ratio of 30 boys per unit fixture and 22 girls per unit fixture in the elementary, middle and high school. It is also suggested that the number of drinking fountains be required by ratio of 65 students per unit fixture. The formulae proposed in this paper can be used for other plumbing fixtures required in school facilities.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권7호
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• pp.3329-3350
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• 2017

Installing caching and computing facilities in mobile edge networks is a promising solution to cope with the challenging capacity and delay requirements imposed on future mobile communication systems. The problem of optimal facility placement in mobile edge networks has not been fully studied in the literature. This is a non-trivial problem because the mobile edge network has a unidirectional topology, making existing solutions inapplicable. This paper considers the problem of optimal placement of a fixed number of facilities in a mobile edge network with an arbitrary tree topology and an arbitrary demand distribution. A low-complexity sequential algorithm is proposed and proved to be convergent and optimal in some cases. The complexity of the algorithm is shown to be $O(H^2{\gamma})$, where H is the height of the tree and ${\gamma}$ is the number of facilities. Simulation results confirm that the proposed algorithm is effective in producing near-optimal solutions.