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)
Splenic tumours are occasionally found during routine physical check-ups or elective abdominal image studies. Histologically, most splenic tumours are of benign vascular origin. To avoid unnecessary surgery for asymptomatic patients with benign splenic tumours and clarify the clinicopathological features of spleen tumours, this study gathered 44 cases of(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)
We describe a low-energy glow-discharge process using reactive ion etching system that enables non-circular device patterns, such as squares or hexagons, to be formed from a precursor array of uniform circular openings in polymethyl methacrylate, PMMA, defined by electron beam lithography. This technique is of a particular interest for bit-patterned(More)
Ta/Ru/Co/Ru/Co/Cu/Co/Ni80Fe20/Ta spin-valve giant magnetoresistive (GMR) multilayers were deposited using UHV magnetron sputtering and optimized to achieve a 13% GMR ratio before patterning. The GMR multilayer was patterned into 12 sensor arrays using a combination of e-beam and optical lithographies. Arrays were constructed with 400 nm × 400 nm and 400 nm(More)