• Journal of the Korean Society for Railway
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• v.4 no.2
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• pp.39-46
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• 2001

In this paper, train running test and lateral resistant force test are conducted before and after sprinkling the ballast stabilizer in order to investigate the dynamic behaviors and parameters of the railroad track. The measured results are used to confirm the effect of the stabilizer and to validate the numerical results. From this paper, it is known that the stabilizer used in this study has excellent effect on increasing the vertical rigidity and the lateral resistance, and some correction factors should be considered on masses and rigidities of the track components in order to calculate the vibration magnitude reasonably due to running train.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.5
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• pp.44-52
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• 2007

In this study, design and control method using low cost Micro-controller(MCU) for inverter driving circuit in fluorescence lamp is presented. Soft starting technique is adopted to reduce switching loss and moment deterioration which are induced by high speed switching frequency in inverter ballast. Performance of the ballast stabilizer and the lighting characteristic of the fluorescence lamp have been improved by stabilizing switching pulses through the Pulse Width Modulation control.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.10a
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• pp.7-11
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• 2008

The fluorescent lamp is one of a discharge lane that is used by electric discharge to transfer from electrical energy to light The fluorescent lamp needs a ballast stabilizer when turn it on because it has negative resistance. Characters of electric discharge and transformed characters of ballast stabilizer are connected closely. Therefore, bring out best design directive that consider economical efficiency and term of a application is very important for both characters matching. In this case, we will team to develop tester and functions for expression for recognizing the end of fluorescent lamp life to solve fire problem and losing efficiency of light when a fluorescent lamp goes the end of the expected its life span.

• Proceedings of the KSR Conference
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• 2000.05a
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• pp.479-486
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• 2000

There has been recently an on-going effort in railway community to improve the dynamic performance of on-site railroad track with limited track possession time. In this paper, train running test lateral resistant force test and static/dynamic analyses are conducted before and after sprinkle of the ballast stabilizer in order to investigate the dynamic behaviors and parameters of the railroad track. Based upon the above results, effects of the stabilizer is verified, and a table for the track modulus representing on-site track condition and the methods to reduce the vibration and the transmitting forces of the ballasted track components to the infrastructures are suggested. It is thought that the suggestions made in this paper could be used as the preliminary data for the condition assessment and the maintenance of the track in the future.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.4
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• pp.911-917
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• 2008

In this paper. we introduce and investigate new architectures and comprehensive design methodologies of intelligent dimming converter and evaluate the proposed model and the system through a series of numeric experiments. The intelligent dimming converter is developed by using the regression polynomial fuzzy model. In this paper, we put emphasis on the design of electronic ballast based on intelligent dimming converter and the energy saving according to the day-light and the user setting by applying the intelligent model to a fluorescent lamp. We show the superiority of the proposed intelligent dimming converter through the evaluation of performance with conventional electronic ballast by applying the intelligent model to real systems.