Chih-Yao Hsiao

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Wireless Visual Sensor Networks (WVSNs) consist of a set of camera sensor nodes each of which equips with a camera and is capable of communicating with the other camera sensors within a specific distance range. As an extension of wireless sensor networks (WSNs), the WVSNs can provide richer information such as image and picture during executing targets(More)
The existing channel variation (or fading) is one of the big challenges that affects the capacity of wireless networks. Recently, cooperative communication has been considered as an effective way to improve the communication reliability. In this paper, a novel medium access control (MAC) protocol, called CMMI, has been proposed for exploiting the(More)
A Wireless Sensor and Robot Network (WSRN) is composed of a set of sensors and robots. Compared with the traditional Wireless Sensor Network (WSN), the WSRN has added characteristics, such as the mobility of robots. The mobility of robots has been proven to be quite useful in prolonging the network lifetime of the monitoring environment. However, mobility(More)
The k-Barrier Coverage is known as the problem of detecting the intruders by at least k sensors when the intruders moving along the crossing paths from one boundary to another. This paper proposes a barrier coverage mechanism for Wireless Mobile Sensor Networks (WMSNs). At the network initialization phase, all mobile sensors move in a distributed manner for(More)
IEEE 802.11 specifies a Power Saving Mode (PSM) in order to save the consumption of energy or power for mobile stations in wireless ad hoc networks. Following the standard of PSM, a number of studies [1– 5] further discussed the wake-up/sleep scheduling of beacon intervals based on Quorum systems so that any communication pair of stations has common awake(More)
Multi-channel MAC protocols have attracted much attention because they possess the ability to boost the capacity of wireless ad hoc networks. In previous works, a lot of multichannel protocols, such as DCCB[1-2], HB[4], and SB[5-7], have been proposed to cope with the rendezvous problem and efficiently utilize the bandwidth resources. However, these(More)
Target Coverage is an important issue in Wireless Sensor Networks (WSNs). This work copes with the target coverage problem which dispatches a set of mobile sensors to targets efficiently. Given disconnected targets with different Quality of Monitoring (QoM) in the networks, the mobile sensors are distributed randomly in the networks and are not able to(More)
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