Cheuk Hong Cheng

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In this paper, we propose a two-step tone-mapping algorithm to convert a high dynamic range (HDR) image to a low dynamic range (LDR) image. The first step S1 constructs a global tone mapping which optimizes between uniform quan-tization and histogram equalization. The second step S2 improves the visual quality by optimizing between global operation and(More)
Full-waveform acoustic logging has made significant advances in both theory and appli c cation in recent years, and these advances have greatly increased the capability of log analysts to measure the physical properties of formations. Advances in theory provide the analytical tools required to understand the properties of measured seismic waves, and to(More)
In this study, we investigated a fluidic system that adheres to new concepts of energy production. To improve efficiency, cost, and ease of manufacture, a millimetrically scaled device that employs a droplet-based co-axial fluidic system was devised to complete alkali-catalyzed transesterification for biodiesel production. The large surface-to-volume ratio(More)
In this paper, the commercial 0.5-μm AlGaAs/InGaAs/GaAs pseudo-morphic high electron mobility transistors were subjected to both high-drain voltage and high-temperature stresses for investigating reliability issues. The results reveal that the stress-induced trapping phenomena near two-dimensional electron gas layer should be responsible for the different(More)
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