• 한국인터넷방송통신학회논문지
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• 제18권3호
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• pp.209-214
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• 2018

본 논문은 부패상품의 수송시간 제약조건 $L^*$이내로 총 수송비용을 최소화시키는 물류센터 위치를 결정하는 문제의 단순한 알고리즘을 제안하였다. 이 문제에 대해 Lee[4]는 후보 물류센터 위치를 선정하고, 각 물류센터의 총 수송비용을 구한 후, 상위 2개 물류센터에 대해 최적의 위치로 이동시키는 복잡한 방법을 제안하였다. 반면에 본 논문에서는 서브트리 개념을 도입하여 $L^*$ 이내가 되는 후보 물류센터의 위치를 간단히 결정하고, 근방 개념을 도입하여 요구량이 집중화된 지역 상위 2개 지역에 대해 총 수송비용이 최소화되는 지점을 단순히 최적의 위치로 결정하였다.

• Nuclear Engineering and Technology
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• 제42권5호
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• pp.582-589
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• 2010

As a part of the back-end fuel cycle, transportation of spent nuclear fuel (SNF) from nuclear power plants (NPPs) to a fuel storage facility is very important in establishing a nuclear fuel cycle. In Korea, the accumulated amount of SNF in the NPP pools is troublesome since the temporary storage facilities at these NPP pools are expected to be full of SNF within ten years. Therefore, Korea cannot help but plan for the construction of an interim storage facility to solve this problem in the near future. Especially, a decision on several factors, such as where the interim storage facility should be located, how many casks a transport ship can carry at a time and how many casks are initially required, affect the configuration of the transportation system. In order to analyze the various possible candidate scenarios, we assumed four cases for the interim storage facility location, three cases for the load capacity that a transport ship can carry and two cases for the total amount of casks used for transportation. First, this study considered the currently accumulated amount of SNF in Korea, and the amount of SNF generated from NPPs until all NPPs are shut down. Then, how much SNF per year must be transported from the NPPs to an interim storage facility was calculated during an assumed transportation period. Second, 24 candidate transportation scenarios were constructed by a combination of the decision factors. To construct viable yearly transportation schedules for the selected 24 scenarios, we created a spreadsheet program named TranScenario, which was developed by using MS EXCEL. TranScenario can help schedulers input shipping routes and allocate transportation casks. Also, TranScenario provides information on the cask distribution in the NPPs and in the interim storage facility automatically, by displaying it in real time according to the shipping routes, cask types and cask numbers that the user generates. Once a yearly transportation schedule is established, TranScenario provides some statistical information, such as the voyage time, the availability of the interim storage facility, the number of transported casks sent from the NPPs, and the number of transported casks received at the interim storage facility. By using this information, users can verify and validate a yearly transportation schedule. In this way, the 24 candidate scenarios could be constructed easily. Finally, these 24 scenarios were compared in terms of their operation cost.

• 대한교통학회지
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• 제18권2호
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• pp.91-101
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• 2000

현재 교통경제학에서 통용되는 도로시설의 최적 혼잡통행료는 분석의 대상을 개별 시설로 국한시킨 부분적인 사회복지 최적화모형에서 도출한 것이다. 그렇지만 특정 시설에 국한하여 부과하는 경우, 부분균형에서 해당 시설의 최적 혼잡통행료는 교통망 전체로서 사용자 후생을 최대화시킬 수 있는지 불분명하다. 특정 시설에 부과된 통행료는 여타 대체시설의 교통량을 증가시키는 파급효과를 동반하기 때문이다. 본 연구에서는 이와 같은 기존 이론의 취약점을 극복하는 대안적 접근방법이 제시되었다. 본 연구의 주된 차이점은 여러 개의 교통시설 이외에도 일반 소비재가 유통되는 시장에 대한 일반균형분석을 통해 최적의 혼잡통행료를 산출한 것이고, 이러한 접근방법은 기존 이론과는 차별화된 분석결과를 가져왔다. 이러한 일반균형분석에서 모든 교통시설에 혼잡통행료를 부과하는 경우, 개별 교통시설의 최적 혼잡통행료는 해당 시설의 한계비용이 한계효용과 일치시키는 값이었다. 이러한 분석결과는 부분균형에서 유도된 기존의 결과와 일치한다. 반면 특정 교통시설에 국한하여 혼잡통행료를 부과하는 경우, 혼잡통행료는 대체시설로의 수요 전이효과등을 반영하여 부분균형에서의 최적 혼잡통행료에 비해 낮은 값으로 나타났다.

• Journal of Radiation Protection and Research
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• 제34권1호
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• pp.1-7
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• 2009

It is expected that a substantial amount of spent fuels will be transported from the four nuclear power plant (NPP) sites in Korea to a hypothetical centralized interim storage facility or a final repository in the near future. The cost for the transportation is proportional to the amount of spent fuels. In this paper, a cost estimation program is developed based on the conceptual design of a transportation system and a logistics analysis. Using the developed computer program, named as CASK, the minimum capacity of a centralized interim storage facility (CISF) and the transportation cost for PWR spent fuels are calculated. The PWR spent fuels are transported from 4 NPP sites to a final repository (FR) via the CISF. Since NPP sites and the CISF are located along the coast, a sea-transportation is considered and a road-transportation is considered between the CISF and the FR. The result shows that the minimum capacity of the interim storage facility is 15,000 MTU.

• 대한안전경영과학회지
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• 제15권1호
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• pp.77-85
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• 2013

In the location science, environmental effect becomes a new main consideration for site selection. For the unwanted facility location selection, decision makers should consider the cost of resolving the environmental conflict. We introduced the negative influence cost for the facility which was inversely proportional to distance between the facility and residents. An unwanted facility location problem was suggested to minimize the sum of the negative influence cost and the transportation cost. The objective cost function was analyzed as nonlinear type and was neither convex nor concave. Three GRASP (Greedy Randomized adaptive Search Procedure) methods as like Random_GRASP, Epsilon_GRASP and GRID_GRASP were developed to solve the unwanted facility location problem. The Newton's method for nonlinear optimization problem was used for local search in GRASP. Experimental results showed that quality of solution of the GRID_GRASP was better than those of Random_GRASP and Epsilon_GRASP. The calculation time of Random_GRASP and Epsilon_GRASP were faster than that of Grid_GRASP.

• 대한안전경영과학회지
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• 제19권1호
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• pp.219-226
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• 2017

This study investigates application cases of facility management system model for enhancing facility productivity of industry filed around medium and small facility processing companies and finds the inefficiency of the existing management model. Following items are researched to seek out methods and measures to maximize facility productivity through empirical analysis by exploring and establishing a new management model. First, the empirical analysis, it is found that the overall equipment efficiency index used for facility productivity management in the companies has a difficulty being used as the index for it in actual medium-small processing companies. Second, a new facility management system model applying standard cycle time is suggested among facility management index system to measure facility productivity. Third, the empirical analysis is used to verify that developed facility management system model is a useful method to manage the facility productivity by applying the model to actual medium-small processing companies. Finally, it is necessary to implement comparison analysis on whether actual productivity enhancement induces a distinctly different result by using a new facility management index system model to be inhibited in this study.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1768-1776
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• 2007

This paper suggests a new Level of Service (LOS) for a pedestrian facility in a transportation transfer center. They include the road, stair, and waiting place for a pedestrian. A current situation of several pedestrian facility was surveyed for the existing transportation transfer center at both Seoul and Pusan metropolitan cities. A new LOS was developed based on the output according to foreign criteria as well as an interview of pedestrians for their satisfaction.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.954-963
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• 2006

PRT(Personal Rapid Transit) is alternation mode of auto and advanced transportation system as future transportation mode cope with the situation caused by increasing traffic demand, vehicle, environment, energy problem. but there is no place where PRT is operated therefore it is necessary of study on application of PRT The purpose of this study is putting into shape of fundamental notion and role of PRT as transit system and studying of domestic application possibility We expect that PRT make transit will make variety and be able to connect with mass transportation facility, have a connection between trunk line and branch line, be a effective local transportation system within CBD, be a transportation system within leisure complex. This study focus on connection with mass transportation facility in the middle of 5 type, we class as. and we investigate application of PRT by process of making a choice applicable case area

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1816-1824
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• 2011

Recently, with traffic SOC investment policy changing from road-centered to railway-centered according to environment-friendly and sustainable development, issues regarding overlapping and overinvestment of traffic facility have been raised. Regarding investment of various traffic facilities of which departure and destination are similar to each other, academia, civic organizations, government, etc. are recognizing problems including overlapping investment of budget, environmental destruction, etc., but not suggesting definite solutions. Objective transportation network analysis is required because various positive effects including solutions of delay/congestion may occur due to provision of alternative way and distribution of the amount of traffic when accidents occur, as well as negative effects suggested by some of civic organizations in various transportation facility investment of similar departure and destination. Hereupon, this study tries to suggest a tool that can objectively evaluate interrelations of transportation network by applying multi-criteria analysis including economic feasibility regarding analysis of interconnections between and within means of transportation.

• Nuclear Engineering and Technology
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• 제49권4호
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• pp.721-733
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• 2017

When temporary spent fuel storage pools at nuclear power plants reach their capacity limit, the spent fuel must be moved to an alternative storage facility. However, radioactive materials must be handled and stored carefully to avoid severe consequences to the environment. In this study, the risks of three potential accident scenarios (i.e., maritime transportation, an aircraft crashing into an interim storage facility, and on-site transportation) associated with the spent fuel transportation process were analyzed using a probabilistic approach. For each scenario, the probabilities and the consequences were calculated separately to assess the risks: the probabilities were calculated using existing data and statistical models, and the consequences were calculated using computation models. Risk assessment software was developed to conveniently integrate the three scenarios. The risks were analyzed using the developed software according to the shipment route, building characteristics, and spent fuel handling environment. As a result of the risk analysis with varying accident conditions, transportation and storage strategies with relatively low risk were developed for regulators and licensees. The focus of this study was the risk assessment methodology; however, the applied model and input data have some uncertainties. Further research to reduce these uncertainties will improve the accuracy of this model.