data collected from mobile phones have potential knowledge to provide with important behavior patterns of individuals. In this paper, we present approaches to discovering personal mobility and characteristics based on...
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In wireless sensor networks (WSNs) where the nodes operate on batteries, for which replacement and recharging is almost impossible. So it is critical to prolon g the network lifetime by minimizing the total energy con...
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In wireless sensor networks (WSNs) where the nodes operate on batteries, for which replacement and recharging is almost impossible. So it is critical to prolon g the network lifetime by minimizing the total energy consumption, while satisfying given throughput requirements. With this objective in mind, an automatic retransmission request (ARQ) protocol for exploiting cooperative communication is introduced and a generalized model is proposed for analyzing the throughput and energy efficiency of the scheme. The numerical results reveal that the throughput and energy efficiency of the scheme is much better than that of the traditional ARQ scheme.
Since the existence of characteristics of heterogeneity, limited energy, complexity and so forth, it turns into a research hot spot on the security mechanism of wireless sensor networks (WSN), especially the problems ...
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In view of the slowness, the locality of convergence and the low accuracy of Simple Genetic Algorithm (SGA) in solving complex continuous space optimization problems, we introduce an improved genetic algorithm called ...
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In view of the slowness, the locality of convergence and the low accuracy of Simple Genetic Algorithm (SGA) in solving complex continuous space optimization problems, we introduce an improved genetic algorithm called Quantum Genetic Algorithm based Search Space Partition (SSPQGA). In this algorithm, the search space partition method is used to increase search accuracy and inhibit premature problem. The chromosomes are composed of quantum bits whose probability amplitudes comprise gene chains. The quantum chromosomes are evolved by quantum rotation gates, and mutated by quantum non-gates. Several typical examples are carried out and the results indicate that the novel algorithm possesses advantages such as less chance of being trapped into premature states, higher accuracy and higher stability. As a result, SSPQGA can be widely applied to many complex continuous space optimization problems which require higher accuracy.
In view of the slowness and the locality of convergence for Particle Swarm Optimization (PSO) in solving complex continuous space optimization problems. Based the idea of wavelet analysis and quantum algorithm, this p...
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Because sensor nodes are typically resource-constrained, the key challenge in Wireless Sensor networks (WSNs) design is the energy-efficiency and how to deal with the trade-off between it and the QoS parameters. data ...
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data aggregation is one of the key technologies for Wireless Sensor networks applications. data aggregation can cut down the data traffic, thereby reduce energy consumption, and extend the network lifetime. But the Qo...
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To design a routing protocol that saves sensor node energy while meeting the needs of different applications has become a research focus in wireless sensor network. In this paper, we propose Energy-Efficient and Delay...
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To design a routing protocol that saves sensor node energy while meeting the needs of different applications has become a research focus in wireless sensor network. In this paper, we propose Energy-Efficient and Delay-Constrained Routing (EEDCR) protocol, in which delay-sensitive packets are transmitted along the shortest path to minimize their end-to-end delay, while others are sent to the next hop which is selected based on local neighbor information, e.g., the remaining energy, the proportion covered by the length of data in the total length of the queue and the depth, which alleviates congestion at hot spots. The simulation results show that EEDCR reduces the average end-to-end delay, balances the energy consumption, and prolongs network lifetime.
There are a number of leaf recognition methods, but most of them are based on Euclidean space. In this paper, we will introduce a new description of feature for the leaf image recognition, which represents the leaf co...
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In the scenario of up links from users to cooperating nodes are not reliable, we construct a wireless channel model and introduce channel coding and network coding into cooperative communication system and propose a c...
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In the scenario of up links from users to cooperating nodes are not reliable, we construct a wireless channel model and introduce channel coding and network coding into cooperative communication system and propose a cooperating scheme based on joint channel-network coding. As metric of system performance, according to Shannon theorem, the system outage probability is analyzed and an expression is provided. Based system outage probability, we study the impact of energy and rate allocation, and provide an appropriate allocation coefficients. Analysis and simulation show that, even though the up links from users to cooperating node are not reliable, our cooperating scheme also can achieve spatial diversity, and improve system performance.
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