Browsing by Author "Chang, Yu-Chi"

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A rule-based inter-session network coding scheme over IEEE 802.16(d) mesh CDS-mode networks
(2012-02-02)
Wang, Shie-Yuan
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Lin, Chih-Che
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Chang, Yu-Chi
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資訊工程學系
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Department of Computer Science
In the literature, an opportunistic inter-session network coding scheme needs to exchange extra control messages to maintain traffic flow states to operate. However, such a requirement increases the implementation complexity of a network coding scheme. In this paper, we propose a rule-based network coding scheme (RNC) that performs opportunistic intersession network coding using a stateless design. By exploiting this stateless design, the proposed coding scheme is easy to implement and deploy. In addition, in this paper based on RNC we study the hidden terminal problems between different coding structures. Such a problem may result in severe packet collisions in a network-coding-based network and thus degrade network coding performance. To alleviate this problem, based on RNC we propose a smart handshake procedure (called RNC-SHP) over the IEEE 802.16(d) mesh coordinated distributed scheduling (CDS) mode to reduce the number of hidden terminals between pairwise network coding structures. Our simulation results show that the proposed RNC schemes can greatly outperform the original routing-based scheme on end-to-end flow goodputs and packet delays. (C) 2011 Elsevier B.V. All rights reserved.
Dielectrophoretic cell concentrator on EWOD-Based chips
(2006)
Huang, Po-Weng
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Wang, Tsu-Te
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Lin, Sheou-Wei
;
Chang, Yu-Chi
;
Fan, Shih-Kang
Dielectrophoretic concentrators were successfully developed on a EWOD-based chip. In such a chip, two major electrokinetic forces were exerted on objects on different scales. EWOD is used to pump droplets on a mm scale, while DEP manipulates bio-particles on a pm scale. Both cells and polystyrene beads were used to demonstrate the concentration abilities by pDEP and nDEP forces, respectively. Since electrodes are covered with a dielectric layer, instead of creating nonuniform electric fields in the liquid, low frequency signals are consumed in the dielectric layer and providing EWOD. It is necessary to use high frequency signals to generate DEP on a EWOD-based chip. Concentration efficiency, measured by cell count chamber before and after experiments, is around 1.62 with single cycle of pDEP attraction.