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363 results on '"Wang, Chih-Yu"'

161. DANCE

Author

Chen, Chun-Wei, primary, Wang, Chih-Yu, additional, Chao, Shih-Lung, additional, and Wei, Hung-Yu, additional

Published
2010
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169. Optical Imaging of Objects in Turbid Medium With Ultrashort Pulses

Author

KAOUSHUNG UNIV (TAIWAN) DEPT OF BIOMEDICAL ENGINEERING, Wang, Chih-Yu, Sun, Chia-Wei, Yang, C. C., Kiang, Yean-Woei, Lin, Chii-Wann, KAOUSHUNG UNIV (TAIWAN) DEPT OF BIOMEDICAL ENGINEERING, Wang, Chih-Yu, Sun, Chia-Wei, Yang, C. C., Kiang, Yean-Woei, and Lin, Chii-Wann

Abstract

Photons are seriously scattered when entering turbid medium; thus the images of objects hidden in turbid medium can not be obtained by just collecting the transmitted photons. Early-arriving photons, which are also called ballistic or snake photons, are much less scattered when passing through turbid medium, and contains more image information than the late-arriving ones. Therefore, objects embedded in turbid medium can be imaged by gathering the ballistic and snake photons. In the present research, we try to recover images of objects in turbid medium by simultaneously "time-gate" and "polarization- gate" to obtain the snake photons. An Argon-pumped Ti-Sapphire laser with 1OOfs pulses was employed as light source. A streak camera with 2ps temporal resolution was used to extract the ballistic and snake photons. Two pieces of lean swine meat, measured 4mmX3mm and 5mmX4mm, respectively, were placed in a iOcmXlOcmX3cm acrylic tank, which was lull of diluted milk. A pair of a polarizer and an analyzer was used to extract the light that keeps polarization unchanged. The combination of time gating and polarization gating resulted in good images of objects hidden in turbid medium., Proceedings of SPIE, v4082, 26-27 Jul 2000, p14-22. This article is from ADA398019 Optical Sensing, Imaging and Manipulation for Biological and Biomedical Applications Held in Taipei, Taiwan on 26-27 July 2000. Proceedings

Published
2000

174. Learning and decision making with negative externality for opportunistic spectrum access.

Author

Biling Zhang, Chen, Yan, Wang, Chih-Yu, and Liu, K. J. Ray

Abstract

In cognitive radio networks, secondary users (SUs) are allowed to opportunistically exploit the licensed channels by sensing primary users' (PUs) activities. Once finding the spectrum holes, SUs generally need to share the available licensed channels. Therefore, one of the critical challenges for fully utilizing the spectrum resources is how the SUs obtain accurate information about the PUs' activities and make right decisions of accessing channels to avoid competition from other SUs. In this paper, we formulate SUs' learning and decision making process as a Chinese Restaurant Game by considering the scenario where SUs sense channels simultaneously and make access decisions sequentially. In the proposed game, SUs build the knowledge of the PUs' activities by their own sensing and learning the information from other SUs. They also predict their subsequent SUs' decisions to maximize their own utilities. We analyze the interactions among SUs in the proposed game and study specifically the impact of SUs' prior belief and sensing accuracy on their decisions. We also derive the theoretic results for the two-user two-channel case. Finally, we demonstrate the effectiveness and efficiency of the proposed scheme through simulations. [ABSTRACT FROM PUBLISHER]

Published
2012
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194. Microfluidic one-step synthesis of Fe3O4-chitosan composite particles and their applications.

Author

Yang, Chih-Hui, Wang, Chih-Yu, Huang, Keng-Shiang, Kung, Chao-Pin, Chang, Yi-Ching, and Shaw, Jei-Fu

Subjects
*MICROFLUIDICS, *IRON oxide synthesis, *CHITOSAN, *CONTROLLED release drugs, *COMPOSITE materials, *MAGNETIC particles
Abstract

Abstract: This paper demonstrates a simple and easy approach for the one-step synthesis of Fe3O4-chitosan composite particles with tadpole-like shape. The length and diameter of the particles were adjustable from 638.3μm to ca. 798μm (length), and from 290μm to 412μm (diameter) by varying the flow rate of the dispersed phase. Mitoxantrone was used as the model drug in the drug release study. The encapsulation rate of the drug was 71% for chitosan particles, and 69% for magnetic iron oxide-chitosan particles, respectively. The iron oxide-chitosan composite particles had a faster release rate (up to 41.6% at the third hour) than the chitosan particles (about 24.6%). These iron oxide-chitosan composite particles are potentially useful for biomedical applications, such as magnetic responsive drug carriers, magnetic resonance imaging (MRI) enhancers, in the future. [Copyright &y& Elsevier]

Published
2014
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200. High-Accuracy Waveguide Leaky-Mode Analysis Using a Multidomain Pseudospectral Frequency-Domain Method Incorporated With Stretched Coordinate PML.

Author

Wang, Chih-Yu, Liu, Hsuan-Hao, Chung, Shih-Yung, Teng, Chun-Hao, Chen, Chung-Ping, and Chang, Hung-chun

Abstract

A recently developed pseudospectral frequency-domain (PSFD) method employing a penalty scheme is further incorporated with stretched coordinate perfectly matched layers (PMLs) in order to solve waveguide leaky modes. Several standard leaky-mode slab and circular waveguides, including the W-type and M-type ones, are examined first by solving their complex effective indexes and field profiles, showing that the PSFD method achieves computational accuracy on the order of 10^-15. Then, this high-accuracy solver is used to analyze waveguide structures with more complicated geometries, such as the leaky six-air-hole fiber, for which self convergence of accuracy in calculated effective indexes is demonstrated to be on the orders of 10^-14, and two rectilineal waveguides with sharp corners, i.e., the rib waveguide and the photonic wire. Comparison of the PSFD method obtained results for these more complicated waveguide structures with those from other methods in the literature is presented and discussed. [ABSTRACT FROM PUBLISHER]

Published
2013
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