Browsing by Author "Huang, Yu-Chi"

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An Adaptive Particle Filtering for Solving Occlusion Problems of Video Tracking
(2015)
Dung, Lan-Rong
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Huang, Yu-Chi
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Huang, Ren-Yu
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Wu, Yin-Yi
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交大名義發表
In recent years, the visual object tracking has drawn increasing interests. There are many applications, e.g., video surveillance in airports, schools, hospitals and traffic. The object surveillance may provide crucial information about the behavior, interaction, and relationship between objects of interest. This paper addresses issues in object tracking where videos contain complex scenarios. We propose an adaptive particle filters tracking scheme with exquisite resampling (AERPF), which improves prediction, importance sampling and resampling. In prediction step, an adaptive strategy for search region and particle number is addressed for object disappearing or obstacle disturbance, which can obtain results more effectively. In addition, in importance sampling, we use optical flow to refine the particle weights using the dynamical object motion information, which results the better accuracy of object location updating. Moreover, exquisite resampling (ER) algorithm can be applied for reflecting more the posterior probability density function of true state. The proposed method can be applied for object tracking both on fixed and active camera, handling partial occlusion and full occlusion problem properly. As a result, it outperforms other existing methods.
Dual-Section-Average (DSA) Analog-to-Digital Converter (ADC) in Digital Pulse Width Modulation (DPWM) DC-DC Converter for Reducing the Problem of Limiting Cycle
(2008)
Huang, Yu-Chi
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Chen, Hsin-Chao
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Tai, Tin-Jong
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Chen, Ke-Horng
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電控工程研究所
This paper proposes a dual-section average (DSA) analog-to-digital converter (ADC) to achieve a closed-loop digital pulse width modulation (DPWM) DC-DC converter with performance compatible to that by the analog PWM converter. For a 2.4V input voltage, a regulated output voltage of 1.2V can provide output current of 600mA without any off-chip compensators. Besides, the output ripple can be reduced to about 8mV(p-p) by theoretical result. The test chip was fabricated in 0.35 mu m CMOS technology. Owing to the parasitic resistance, the output ripple of the experimental result is within 8mV(p-p). Furthermore, the transient recovery time is within 50 mu s when load current changes from 120mA to 600mA, or vice versa.
SiMMap: a web server for inferring site-moiety map to recognize interaction preferences between protein pockets and compound moieties
(2010-07-01)
Chen, Yen-Fu
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Hsu, Kai-Cheng
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Lin, Shen-Rong
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Wang, Wen-Ching
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Huang, Yu-Chi
The protein-ligand interacting mechanism is essential to biological processes and drug discovery. The SiMMap server statistically derives site-moiety map with several anchors, which describe the relationship between the moiety preferences and physicochemical properties of the binding site, from the interaction profiles between query target protein and its docked (or co-crystallized) compounds. Each anchor includes three basic elements: a binding pocket with conserved interacting residues, the moiety composition of query compounds and pocket-moiety interaction type (electrostatic, hydrogen bonding or van der Waals). We provide initial validation of the site-moiety map on three targets, thymidine kinase, and estrogen receptors of antagonists and agonists. Experimental results show that an anchor is often a hot spot and the site-moiety map can help to assemble potential leads by optimal steric, hydrogen bonding and electronic moieties. When a compound highly agrees with anchors of site-moiety map, this compound often activates or inhibits the target protein. We believe that the site-moiety map is useful for drug discovery and understanding biological mechanisms. The SiMMap web server is available at http://simfam.life.nctu.edu.tw/.