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With the development of sensor and wireless communication technologies, the concept of body sensor networks (BSNs) is proposed in recent years. BSNs are used to measure a large number of vital signs of the human body. Body sensor devices are typically powered by batteries and difficult to replace, so energy efficient medium access control (MAC) protocols, which can perform medium access mechanism...
Consolidation virtual machine (VM) on fewer physical servers is an efficient way to reduce energy consumption in data center. However, VMs often have inherent dependencies which bring complex load interactions among the underlying physical servers. Unreasonable migration will lead to a decline in network performance. In this paper, aiming at energy saving, we propose an application-aware policy in...
Wireless capsule endoscopy (WCE) is getting more and more popular in recent years. Compared with the traditional push endoscopy, it gives patients little discomfort. Researchers are focusing on providing many advanced functionalities such as active locomotion, drug delivery. it can also imagined that more than one capsules are swallowed by patients and these capsules co-work to finish some common...
Considering the case of AUV (Autonomous Underwater Vehicle) navigating with low speed near water surface, a new method for design of roll motion controller is proposed in order to improve roll stabilizing performance of AUV. Control system design is based on GPC (General Predictive Control) theory. Coupling horizontal motion model of AUV is equivalently transformed into a discrete difference equation...
The existing data gathering scheme in wireless sensor networks usually takes place from sensors to static sinks. If sink can move randomly, data gathering process needs the cooperation of sinks. In this article, a load balancing data gathering scheme is proposed. In our scheme, the sensed data for target is stored in the storage path pointed to the network center, and the query request put forward...
Power consumption is an increasingly impressing concern for data servers as it directly affects running costs and system reliability. Prior studies have shown most memory space on data servers are used for buffer caching and thus cache replacement becomes critical. Temporally concentrating memory accesses to a smaller set of memory chips increases the chances of free riding through DMA overlapping...
Clustering is an effective approach for managing nodes in wireless sensor networks (WSN). In this paper, we consider selfish avoidance clustering in WSN. A differential game model is proposed to stimulate forwarding. Based on the payoff value of the differential game, called forwarding contribution (FC) in this paper, a centralized clustering algorithm is proposed. Mathematical proof shows that our...
The advancements in wireless communication and electronic technologies enable novel health monitoring devices to be developed and deployed for in-vivo medical examination and treatment. Wireless capsule which can examine the gastrointestinal tract with many kinds of sensors and send the collected data outside the human body wirelessly is very promising. To the authors' best knowledge, no previous...
In wireless sensor networks (WSNs) application we sometimes only require single moment local field information, but traditional periodical all-network information collecting mode consumes much network resources. In order to satisfy Quality of Service (QoS) demands of information collection in wireless sensor networks, prolong network lifetime and minimize control overheads while insuring connectivity,...
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