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—Selective encryption for video streaming was proposed for efficient multimedia content protection. However, the issues on joint optimization of video quality, content protection, and communication energy efficiency in a wireless sensor network (WSN) have not been fully addressed in the literature. In this paper, we propose a scheme to optimize the energy,(More)
—Image transmissions in Wireless Multimedia Sensor Networks (WMSNs) are often energy constrained. They also have requirement on distortion minimization, which may be achieved through Unequal Error Protection (UEP) based communication approaches. In related literature with regard to wireless mul-timedia transmissions, significantly different importance(More)
—Explosive growth in Information Technology has enabled many innovative application areas such as large-scale outdoor vehicular networks for vehicle-to-vehicle communications. By providing time-sensitive and location-aware information , vehicular networks can contribute to a safer and more efficient driving experience. However, the performance of vehicular(More)
Existing visualization tools typically do not allow easy extension by new visualization techniques, and are often coupled with inflexible data input mechanisms. This paper presents EVolve, a flexible and extensible framework for visualizing program characteristics and behaviour. The framework is flexible in the sense that it can visualize many kinds of(More)
In this paper, we propose a novel local framing pre-schedule scheme to improve energy saving in CSMA/TDMA hybrid MAC layer of wireless sensor network. This MAC combines CSMA and TDMA functionalities together, while obviates their shortcomings. Usually, in a hybrid CSMA/TDMA MAC such as ZMAC, all the receivers have to perform low power listening all the time(More)
—In this paper, we investigate the resource allocation problem in a single-user relay-aided cognitive radio (CR) underlay network. Both the CR network and the primary network operate under the orthogonal frequency-division multiplexing (OFDM) scheme. Different from the conventional resource allocation problem , the relay node here is capable of performing(More)
Wireless mesh networks(WMNs) have emerged as a key technology for new wireless network technology as well as part of the next generation Internet. The capacity of a wireless mesh network is improved by equipping mesh nodes with multi-radios tuned to non-overlapping channels. By letting these nodes utilize the available channels opportunistically, we(More)