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A Study on the Trolley Sliding Condition Inspection System
ChinYoung Chang,ChanSam Kim,NoGeon Jung,YeonIl Na,YangSu Kim 한국인터넷방송통신학회 2015 International Journal of Internet, Broadcasting an Vol.7 No.2
The Korean electric railway is growing rapidly such as speed of 300km/h in high speed section and 230km/h in the conventional railway section. But, power supply failure occurs because of loss of contact, defective catenary system and high speed vehicle. Therefore preventive maintenance way based reliability has been applied. Typical example is the facility inspection method using trolley inspection system. But it is required differentiated inspection method to prevent problem such as inspection errors. In this paper, a study on the trolley sliding condition inspection system using monitoring techniques is performed for performance enhancement of inspection system. It proposed the efficient maintenance method through monitoring the deviation and height of contact wire after installing inspection system on the top of train which operates in the metropolitan area. Inspection errors were decreased by virtually monitoring the video of faulty facilities. Also those facilities were identified through the impact sound analysis and tests at the main catenary section.
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A Study on the Trolley Sliding Condition Inspection System
Chang, ChinYoung,Kim, ChanSam,Jung, NoGeon,Na, YeonIl,Kim, YangSu The Institute of Internet 2015 International Journal of Internet, Broadcasting an Vol.7 No.2
The Korean electric railway is growing rapidly such as speed of 300km/h in high speed section and 230km/h in the conventional railway section. But, power supply failure occurs because of loss of contact, defective catenary system and high speed vehicle. Therefore preventive maintenance way based reliability has been applied. Typical example is the facility inspection method using trolley inspection system. But it is required differentiated inspection method to prevent problem such as inspection errors. In this paper, a study on the trolley sliding condition inspection system using monitoring techniques is performed for performance enhancement of inspection system. It proposed the efficient maintenance method through monitoring the deviation and height of contact wire after installing inspection system on the top of train which operates in the metropolitan area. Inspection errors were decreased by virtually monitoring the video of faulty facilities. Also those facilities were identified through the impact sound analysis and tests at the main catenary section.
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A 4b/cycle Flash-assisted SAR ADC with Comparator Speed-boosting Technique
Kyeonghwan Park,Chansam Park,Jae Joon Kim 대한전자공학회 2018 Journal of semiconductor technology and science Vol.18 No.2
This paper presents flash-assisted successive approximation register (SAR) analog-todigital converter (ADC) with an energy-efficient speed-boosting structure. The incorporation of a 3-bit flash sub-ADC into the SAR conversion path enables 4b/cycle conversion. For further speed boosting, the comparator is designed to include an auxiliary bootstrap capacitor which relieves settling-time bottleneck of capacitive digital-to-analog converters (C-DACs) in asynchronous SAR operation. This 4b/cycle conversion scheme requires only five switching events of C-DACs switching for 8-bit conversion, resulting in 22.32% reduction of additional switching energy. Prototype circuit implementation reveals that the proposed scheme achieves 75% speed enhancement compared to a conventional SAR scheme. For feasibility verification, the proposed flash-assisted SAR ADC was fabricated using a 0.18 mm CMOS process. Measured signal-tonoise and distortion (SNDR) and spurious-free dynamic range (SFDR) of the prototype were 48.49 dB and 64.95 dB respectively.
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