Chun-sheng Guo

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An adaptive Graph-cut algorithm to video moving objects segmentation was proposed. By the Kalman prediction of the number of objectives pixels and objectives-background pixel-pairs, and adaptive updating of the nodes flux, the Graph-cut algorithm was successfully applied to video moving objects segmentation. It was achieve to continuous global optimization(More)
The specific application of power devices has imposed the requirement for intensive investigation of their reliability. In this paper we have investigated the reliability and failure mechanism of power VDMOS. In constant-stress accelerated life test, the three different temperatures (150°C, 165°C and 180°C) are imposed on the devices.(More)
We apply a reverse AC electrical stress on the Gate of AlGaN/GaN high electron mobility transistors (HEMTs). The change of Schottky Barrier height (SBH) with respect to time is derived from the I-V and C-V characteristics, respectively. The SBHs calculated from the two methods show similar decreasing trend. However, the one from I-V method recovers partly(More)
One watt white light emitting diodes (LEDs) were made by GaN-based blue light chips. The chips were coated by YAG phosphor and transparent silica gel. Current of 900 mA as electrical stress was carried on the LED samples and the optical properties of the samples were observed by measuring the main optical parameters during the aging test. After 4 200 hours(More)
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