Long Chyr Chang

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The support of Boolean set operations in free-form solid modeling systems requires the repeated intersection of parametric surfaces. Present approaches to this problem are sequential and must make trade-offs between accuracy, robustness and efficiency. In this paper, we investigate a parallel approach to the surface intersection problem that shows, both(More)
Location-based data visualization employing geographical information system and information visualization provides an advanced means to assist with visual data exploration, hypothesis formation and decision making. An effective location-based data visualization system can significantly enhance the communication among decision-makers and facilitate the(More)
Currently, most city maps browsing or displaying applications only support high-end mobile devices such as PDAs or smartphones. With GSM or GPRS network widely deployed around the world, there is a continuous demand for map applications to support resources constrained mobile phones. The study presents a map-on-demand delivery scheme which utilizes the SVG(More)
Because of the advances of computer hardware and software, Computer Aided Instruction (CAI) makes learning effective and interesting through the use of interactive multimedia technology. Recently, Augmented Reality (AR) technology has begun to surge as a new CAI tool because of its ability to create tangible and highly interactive user interface. In(More)
Surface-Surface Intersection problems play an important role in the support of Boolean set operations in solid modeling systems. Present approaches are sequential and have to make trade-offs between accuracy, robustness and efficiency. In this paper, we will show that improved algorithms can be obtained using parallel methods and vectorization. We give a(More)
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