Wen-Shyang Hwang

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CHIH-HENG KE, CE-KUEN SHIEH, WEN-SHYANG HWANG AND ARTUR ZIVIANI Department of Computer Science and Information Engineering National Kinmen Institute of Technology Kinmen, 892 Taiwan Department of Electrical Engineering National Cheng Kung University Tainan, 701 Taiwan Department of Electrical Engineering National Kaohsiung University of Applied Sciences(More)
The objective of this paper is to present a novel realistic simulation tool-set for evaluating video delivered quality over wireless network. This tool-set integrates EvalVid and NS-2. With the integration, researchers can easily analyze their designed mechanisms, such as network protocols or QoS control schemes in a realistic simulation environment. We(More)
This paper proposes a Random Early Detection Forward Error Correction (RED-FEC) mechanism to improve the quality of video delivered over Wireless Local Area Networks (WLANs). In contrast to previous FEC schemes, in which the rate determination information is fed back from the receiver side, in our proposed method, the redundancy rate is calculated directly(More)
The failure of legacy packet markers such as the Single Rate Three Color Marker (SRTCM) and the Two Rate Three Color Marker (TRTCM) to distinguish important and less important data renders them unsuitable for MPEG video transmission in a DiffServ network. Therefore, we propose a Two Markers System (TMS) to improve the delivery quality of MPEG video streams.(More)
1389-1286/$ see front matter 2012 Elsevier B.V http://dx.doi.org/10.1016/j.comnet.2012.04.004 ⇑ Corresponding author. Tel.: +886 7381452 73921037. E-mail addresses: jhlin5@hpds.ee.ncku.edu.tw (C hpds.ee.ncku.edu.tw (Y.-C. Wang), shieh@ee.ncku. wshwang@mail.ee.kuas.edu.tw (W.-S. Hwang). 1 Tel.: +886 73814526x5533; fax: +886 73921037 2 Tel.: +886(More)
Forward Error Correction (FEC) is one of the most common means of performing packet error recovery in data transmissions. FEC schemes typically tune the FEC rate in accordance with feedback information provided by the receiver. However, the feedback and FEC rate calculation processes inevitably have a finite duration, and thus the FEC rate implemented at(More)
IEEE 802.15.4 is a standard of Low-Rate Wireless Personal Area Network (LR-WPAN), which provides the communications in short distance, low data rate, low power consumption. In IEEE 802.15.4 a guaranteed time slot (GTS) structure is defined to support high quality of service (QoS) to time-critical traffic. However, the transmission bandwidth of GTS may be(More)
With advances in technology and the economy, people are more inclined to buy cars. However, as a result, people forfeit their lives and property through accidents due to traffic congestion and traffic chaos. To ensure safe driving, anti-collision warning applications have been widely discussed. Most vehicular safety applications use vehicular positioning(More)
Traditional forward error correction (FEC) mechanisms can be divided into end-to-end FEC protection schemes and hop-by-hop FEC protection schemes. The end-to-end FEC protection schemes over-allocate FEC redundancy to each link and may induce a self-congestion effect in a link. The hop-by-hop FEC protection scheme incurs a long end-to-end delay that harms(More)