• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2000.11a
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• pp.163-171
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• 2000

AMBIDEXTER 원자력 에너지 시스템은 Th$^{233}$ /U 핵주기를 이용한 용융염 핵연료가 내장형 열교환기를 포함하는 일체형 원자로 시스템을 순환하면서 1차 냉각 계통을 이루고, 독립된 온라인 정화계통에 의해 액상 용융염 핵연료 일부를 연속 추출. 처리, 재주입 함으로 노심의 핵적 자활상태를 유지한다. 이와 같은 시스템 개념은 배관망 파손에 의한 중대사고 방지, 열수송 회로와 방사성 물질 회로의 독립적 구성을 통한 효과적인 원자력 에너지 이용과 고유 안전성을 확보하는 장점을 통해 현안 원자력 문제의 근본적인 해결 방안을 제시하고 있다.(중략)

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.32 no.7
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• pp.27-33
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• 2003

본고는 수송용 냉동차량의 신기술동향에 관한 것으로, 냉동차량의 시스템 개량, 대체냉매용 냉동차량의 개발, 진공 단열기술, 신개념의 냉동수송 기술동향 등을 소개한 것이다.

• Transactions of the Korean hydrogen and new energy society
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• v.11 no.1
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• pp.43-49
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• 2000

The heat transportation from a complex of industry to a rural area needs more efficient method because the distance between them is usually more than 10km. Conventional heat transportation using steam or hot water via pipe line has limits in transportation distance (about 3~5 km) because of the heat loss and frictional loss in the pipe line. Metal hydride can absorb or discharge hydrogen through exothermic or endothermic reaction. After releasing hydrogen from metal hydride by means of the waste heat from industry, we can transport this hydrogen to urban area via pipe line. In urban areas, other metal alloy reacts with this hydrogen to form metal hydride and produces heat for heating. Cool heat is also obtained if it is possible to use metal hydride with low reaction temperature. Therefore, metal hydride can be used as a media for transportation and storage of heat. $MmNi_{4.5}Al_{0.5}Zr_{0.003}$, $LaNi_5$, $Zr_{0.9}Ti_{0.1}Cr_{0.6}Fe_{1.4}$, $MmNi_{4.7}Al_{0.1}Fe_{0.1}V_{0.1}$ alloys were selected for this purpose and the properties of those metal hydrides were discussed. The design and control techniques were proposed and discussed for this heat transportation system using metal hydride.

• Pallet News
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• s.4
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• pp.1-2
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• 1997

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.33 no.3
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• pp.11-18
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• 2004

흡수식 사이클을 이용한 에너지의 장거리수송 기술을 소개하고 경제성평가 결과를 제시한다. 현재 에너지수요 측면에서 가장 높은 증가율을 보이고 있는 것이 바로 대도시 및 산업단지의 냉$.$난방 및 급탕용 에너지이다. 냉$.$난방에 사용되는 에너지는 10$0^{\circ}C$미만의 저온으로서 고열원 에너지인 화석연료의 사용은 에너지사용 면에서 비효율적이다. 따라서 산업지 역에서 버려지는 폐열원등의 각종 미활용에너지를 이용하여 냉$.$난방부하를 충족시킬 수 있는 에너지 절약형 시스템의 개발이 매우 중요한 과제로 대두되고 있다. 일반적으로 미활용에너지 및 폐열에너지 공급지역은 소비지역으로부터 멀리 떨어져 있다. 지금까지 흡수식시스템은 냉동 및 냉방의 개념에서 기술개발 및 실용적운전이 이루어져 왔으나, 본 논문에서는 흡수식시스템을 이용한 에너지의 장거리수송 및 변환 기술을 소개하고자 한다.

• Solar Energy
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• v.18 no.3
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• pp.169-175
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• 1998

Metal hydrides can be used for the purpose of heat storage and transportation from the industrial complex which own recoverable waste heats to the neighboring cities by the medium of hydrogen. The properties of metal hydrides, some problems of heat transportation using metal hydrides, and the example of heat transportation system were discussed.

• Journal of the Korean Society for Railway
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• v.17 no.5
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• pp.373-380
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• 2014

With a view to the commercialization of the Korean automatic variable-gauge bogie in the Eurasia railway system, the aim of this research was to perform an economic analysis concerning the possible introduction and operation of this bogie at the present time. For this purpose, we compared the possible types of freight connection service for container transportation, transshipment and the gauge-adjustable system, estimating the total life-cycle cost (LCC) incurred by each system, depending on type and quantity, over the whole process of acquisition, operation, maintenance and disposal. Based on this, we presented a case-by case analysis. Furthermore, in estimating economic feasibility, we analyzed the cost-benefit ratio taking into account not only the objective LCC, but also the reduced time required for the gauge-change and customer convenience. After estimating the LCC and analyzing the cost-benefit ratio of the respective systems, we demonstrated the economic superiority of view of the gauge adjustable system.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.22 no.3
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• pp.116-130
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• 2023

Expressways play pivotal roles in cargo transportation because of their superior accessibility and mobility compared to rail and air. On the other hand, there is a limit to the accurate calculation of cargo transportation performance using existing highways owing to the mixture of vehicle types and difficulty in identifying cargo loads of individual cargo vehicles. This paper presents an algorithm for calculating more reliable cargo transportation performance using big data. The traffic performance (veh·km/day) was derived using the data collected from Toll Collecting System. The average tolerance weight for each vehicle type and the cargo load unit (ton/unit) considering it was calculated using vehicle specification information data and high-speed and low-speed axis data. This study calculated the cargo transportation performance by section and type using various online integrated highway data and presented a method for calculating the transportation performance by linking open business offices and private highways.

• Journal of the Korean Society for Railway
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• v.19 no.6
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• pp.833-843
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• 2016

Recently, in the field of rail freight transportation, the number of trains dedicated for shippers has been increasing. These dedicated trains, which run on the basis of a contract with shippers, had been restricted to the transportation of containers, or so called block trains. Nowadays, such commodities have extended to cement, hard coal, etc. Most full freight cars are transported by dedicated trains. But, for empty car distribution, the efficiency still remains questionable because the distribution plan is manually developed by dispatchers. In this study, we investigated distribution models delineated in the KTOCS system which was developed by KORAIL as well as mathematical models considered in the state-of-the-art. The models are based on optimization models, especially the network flow model. Here we suggest a new optimization model with a framework of the column generation approach. The master problem can be formulated into a transportation problem with additional constraints. The master problem is improved by adding a new edge between the supply node and the demand node; this edge can be found using a simple shorted path in the time-space network. Finally, we applied our algorithm to the Korean freight train network and were able to find the total number of empty car kilometers decreased.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.793-796
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• 2008

본 논문은 생산 물류 시스템최적화의 실현에 가장 대표적인 생산수송계획문제인 수송문제(TP: Transportation Problem)에 고정비용을 고려한 고정비용 수송문제(fcTP: Fixed charge Transportation Problem)를 다룬다. 특히 NP-hard문제로 널리 알려진 TP에서 수송량에 비례하는 가변비용과 함께 추가적으로 모든 경로에서 발생하는 고정비용을 함께 고려한 fcTP를 다룬다. 따라서 이러한 fcTP를 해결하기 위해 메타 휴리스틱기법 중에 가장 널리 이용되고 있는 유전 알고리즘(CA: Genetic Algorithm)을 이용한 해법을 제시하고자 한다. 본 논문에서는 CA를 이용해 고정비용 수송문제의 해를 우선순위기반 유전자 표현법을 이용해 fcTP에 적용해 보고 수치 실험을 통해 그 성능에 대한 연구를 한다.