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Kim, Wan-il;Chang, Yoon-Woo;Kim, Dong-Man;Kim, Jae-Moon
- The Transactions of The Korean Institute of Electrical Engineers
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- v.67 no.12
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- pp.1717-1722
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- 2018
Parts and units of 8200 series electric locomotive are aging, but and source technology is not secured. As a results, maintenance costs are increasing steadily due to using expensive substitute parts. Therefore, various studies have been conducted to reduce maintenance costs. In this paper, the life cycle cost(LCC) of the developed and conventional products were compared and analyzed about main conversion system in 8200 Series electric locomotive. As a result of analysis, the material cost was the highest in the conventional product among the various item costs. On the other hand, it is confirmed that preventive cost was the highest among the costs about the developed product.
https://doi.org/10.5370/KIEE.2018.67.12.1717 인용 PDF KSCI

Bin, Miyoung;Moon, Juback;Joh, Chang-Hyeon
- Journal of the Economic Geographical Society of Korea
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- v.15 no.4
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- pp.615-627
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- 2012
This study analyzed the travel pattern with respect to use of public transportation by using transportation card data and presented the measures that can be used in a traffic policy. Transportation card data targeted Gyeonggi-Do area and as a utilization plan, a scenario that when a traffic policy decision maker improves bus stop facilities, the person selects a target site by using several variables that can be obtained from transportation card data was set and analyzed. The analysis result showed that K means cluster analysis which is decision making methodology and CHAID(Chi-squared automatic interaction detection) were used and it can be used usefully in policies in significance level of p <0.01. Also, based on these results, this study presented policy implications to be improved to actually use transportation card data in policies.
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차동원;류춘번
- Journal of the Korean Operations Research and Management Science Society
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- v.3 no.1
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- pp.69-73
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- 1978
This paper deals with the problem of determining the optimal inventory-transportation policy of the idealistically simple inventory-transportation system with the following assumptions: (1) The system consists of a single central warehouse and a single local warehouse, (2) The planning horizon is finite, (3) Demand rate is fixed costant, and so forth. Developed is the algorithm by which to identify the optimal inventory policy which minimizes the total cost incurred to the system over the given finite planning horizon. A sample numerical example is presented along with a discussion of the possible applications of the approach used n the algorithm.
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