• Journal of IKEEE
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• v.23 no.1
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• pp.261-265
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• 2019

We analyze the failure rate change of a conventional bidirectional converter and a modified one which moves an output capacitor towards propulsion battery. We analysis of the circuit structural homogeneity and the difference between both converters, and confirm that the capacitor working voltage is reduced by changing the capacitor position. After obtaining the capacitor failure rate according to voltage stress factor and operating temperature, it is applied to the fault-tree of the bidirectional converter to obtain the overall failure rate of the converter. We analyzes the advantages and disadvantages of design changes by comparing and analyzing the failure rate and mean time between failures (MTBF) according to operating temperature and capacitance value.

• Journal of Navigation and Port Research
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• v.33 no.5
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• pp.339-344
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• 2009

This paper aims at identifying the effectiveness of the maintenance of container cranes in two typical container terminals in Pusan Port based on the empirical data For this the key performance indicator (KPI) was introduced with some information on world class standard level. Then, an empirical analysis was conducted with respect to the interaction of equipment maintenance KPI such as MMBF, PM, EM, and Breakdown ratio.