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Recent studies in wireless sensor networks (WSN) have observed that the irregular link quality is a common phenomenon, rather than an anomaly. The irregular link quality, especially link asymmetry, has significant impacts on the design of WSN protocols. In this paper, we propose two asymmetry-aware link quality services: the neighborhood link quality(More)
— Urban target recognition at intersection using multimodality wireless sensor networks is very promising in reducing accidents by detecting unusual events in real time. To provide alarm signal about the incoming car to the pedestrian using sound, or notify the car driver about the pedestrian using infrastructure-to-vehicle communication, the deployed(More)
In this paper, we combine coarse-grained software pipelining with DVS (Dynamic Voltage/Frequency Scaling) for optimizing energy consumption of stream-based multimedia applications on multi-core embedded systems. By exploiting the potential of multi-core architecture and the characteristic of streaming applications , we propose a two-phase approach to solve(More)
We present <i>Score</i>, a sensor core framework for cross-layer design in wireless sensor networks. Network components running in the context of <i>Score</i> have the ability to collaborate without the need for pair-wise interfaces. This collaboration promotes protocol optimization in the resource constrained wireless sensor networks, a technique widely(More)
As more and more real Wireless Sensor Network's (WSN) applications have been tested and deployed over the last five years, the research community of WSN realises that several issues need to be revisited from practical angles, such as reliability and security. In this paper, we address the reliability issue by designing a general energy-efficient, load(More)
—We study the rendezvous data collection problem for the mobile sink in wireless sensor networks. We introduce to jointly optimize trajectory planning for the mobile sink and workload balancing for the network. By doing so, the mobile sink is able to efficiently collect network-wide data within a given delay bound and the network can eliminate the energy(More)
—We study the rendezvous data collection problem for the Mobile Element (ME) in heterogeneous sensor networks where data generation rates of sensors are distinct. Different from previous efforts, the link quality is instable in our network model and the sensory data cannot be aggregated when transmitting. We introduce to optimize the energy consumption on(More)