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In this study, the discrete dipole approximation (DDA) method was used to simulate the hybrid bi-layer hexagonal lattice of triangular periodic nanoparticle arrays (PNAs). The PNAs nanophotonic devices could be fabricated with pure silver, but their performances would be easily degenerated because of the oxidation (forming Ag2O) and sulfuration (forming Ag2S). Theoretical results show that the oxidation...
Power control is an important component of the resource management strategy in wireless networks to achieve higher utilization and/or better quality of service. In this paper, we present a framework of decentralized power control called trajectory-based power control (TBPC), by setting the SIR target of each wireless station according to some trajectory, which is specified to reflect the corresponding...
Most pilot organizations exposed to AIS are in favor of its deployment and they have the strong endorsement of “the widespread use of AIS employing Differential Global Positioning System (DGPS) and on-board transponder technologies (Wi-Fi). Such technologies would provide the basis for navigation support services in pilotage areas. This paper analyzes the practice of pilot operation, takes research...
Energy-efficient is a key problem of Under-water acoustic sensor network (UASN). Base on analysis of energy consumption for LEACH in underwater channel, we propose a novel scheme for cluster-head selection to ensure nodes energy load balance by considering residual energy of candidate nodes and the distance to SINK, which can lower the probability of selecting nodes with low energy and poor location...
Minimum-hop strategy of normal routing protocols for ad hoc wireless networks doesn't consider the load of the network, which may lead to network congestion and degrade performance of the network thereafter. In order to solve this problem, this paper proposes a simple and effective modified version of AODV-Load-Aware AODV (LA-AODV), in which, each node decides whether or not to accept routing requests...
In this paper, an energy efficient route finding scheme is proposed based on the directional antenna for wireless sensor networks (WSNs). First we derive the relationship between the number of hops and the energy consumption within a certain source-destination distance by analyzing the major factor influencing the power consumption on wireless channels. Second, combined with the benefits from directional...
To balance energy consumption for nodes in wireless sensor network (WSN) is an important considering factor. A simple model is set up to analytically evaluate the energy consumption in WSN by using aggregation mechanism. It is show that energy consumption of an aggregation node increases so rapidly in the neighborhood of the sink node. A modified hierarchical data aggregation strategy is proposed...
Energy-efficiency is a key problem in wireless sensor networks(WSNs) due to the severe power constraint of wireless nodes. When designing protocols for WSNs, it is important for us to consider not only network performance, but also energy consumption. It is difficult for a traditional layered design method to satisfy several objectives at the same time. In this paper, we introduced a cross-layer scheme...
In order to extend the range of the RFID system, it is necessary to integrate RFID into a sensor network. In this paper, we first studied a two-tiered RFID sensor network architecture, in which readers collect data from the tags, and then send the data to the processing center. Based on this structure, we analyzed energy consumption factors of the reader. We proposed a simple strategy to balance the...
In this paper we study mechanisms to scale the capacity of Wireless LAN “hot spots” to a scenario with multiple APs and many wireless users. We first study the impact of separating each AP at the physical layer using multiple overlapping channels as provided by the IEEE 802.11 standard. Then perform an extensive set of ns-2 simulations to study the impact of such factors as channel conditions, node...
Improved security is especially important for the success of the wireless sensor network (WSN), because the data collected are often sensitive and the network is particularly vulnerable. While a number of approaches have been proposed to provide security solutions against various threats to the WSN, most of which are based on the layered design. In this paper, we point out that these layered approaches...
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