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In this paper, we present a vision-based vehicle detection method for collision warning of driver assistance system on highway in the nighttime. The major function of our work is to find preceding vehicles in the dynamic background. The system captures the image of road environment by a camera mounted on the windshield of the test car and uses multi-level(More)
This paper describes the fault diagnosis in the operation of industrial ball bearings. In order to cluster the very small differential signals of the four classic fault types of the ball bearing system, the chaos synchronization (CS) concept is used in this study as the chaos system is very sensitive to a system's variation such as initial conditions or(More)
In this paper, a reflex charger with zero-voltage-switching (ZVS) and non-dissipative cells for photovoltaic (PV) energy conversion is presented. The proposed reflex charger has the following advantages: (1) A ZVS cell is incorporated to reduce the switching losses of the main and auxiliary switches. Therefore, the conversion efficiency of the proposed(More)
In this paper, an active-clamp forward converter with a current-doubler circuit for photovoltaic (PV) energy conversion is proposed. The proposed converter consists of a PV arrays energy source, a active-clamp forward converter, and a current-doubler circuit. It has the following advantages: 1) maximum power point tracking (MPPT) can be accomplished for PV(More)
Questionnaire survey is one of the important research tools for scholars to conduct quantitative information collections. For achieving fast data input, the authors have developed an automatic questionnaire input software by computer vision. This image processing system captures the questionnaire images by a high-resolution camera, and recognizes the(More)
In this paper, an interleaved zero-voltage switching (ZVS) coupled-inductors buck converter with active-clamp circuits is study. Compared with passive-clamp circuits, the active-clamp circuits in the interleaved buck converter provided can have benefits of recycling the leakage energy, while minimum ringing voltage is across the active switches. Moreover,(More)