Huan Ding

Shanghai University, Shanghai, Shanghai Shi, China

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Publications (2)0 Total impact

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    ABSTRACT: A narrow pulse generating system is designed for versatile communication applications, such as pulse modulation of UWB. Multiple parameters of time and frequency domain of the pulse generated are alterable. Special mechanisms are introduced to achieve very precise phase alignment and very fine pulse width adjustment, which are both better than 10ps. A large dynamic range of frequency can be synchronized from Giga Hertz throughout to DC. The system employs specific filter to rectify the pulse with proper spectrum corresponding to the pulse shape desired by certain utilization, and applies high reliability wide band GaAs HBT amplifier with changeable gain to magnify pulse at fast slew rate of edges. Analysis on system performance with application example is carried out.
    No preview · Conference Paper · Jan 2008
  • Huan Ding · Wanggen Wan · Jicheng Lin · Xiaohui Tan
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    ABSTRACT: Simulating natural trees is very important for computer graphics because trees are present in virtually every outdoor scene. Botanical tree is a challenging issue which has a non-rigid, complicated structure. This paper implements a method to solve the problem using stochastic fractal recursion algorithm which can be used to simulate the plant easily. We take advantage of texture mapping to enhance the realism of the projected image and the random factor is taken into account, to produce greater diversity. The algorithm is easy enough to simulate trees, but can generate quite natural tree structure, and can modeling of higher tree which is L-systempsilas drawback.
    No preview · Article · Jan 2008