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In order to maximize the number of connections and reduce the blocking probability of wavelength division multiplexing (WDM) optical networks, a dynamic routing and wavelength assignment (RWA) algorithm is studied in this paper. In the absence of wavelength converter, the network performance deterioration is more likely caused by bottleneck links of the network, which is related to static factors...
In wireless sensor network studies the main objective is minimizing the energy consumption so that the lifetime is maximized under the limited battery capacity constraints. In most event-driven surveillance applications, the end-to-end delay should also be minimized. In this paper we present a new BT-MAC (balanced energy-latency tradeoff Media Access Control) which reaches a good balance between energy...
Energy efficiency has been known as the most significant problem in all facets of the wireless sensor network operations. For large scale WSN deployed in the battlefield it is necessary to consider energy depletion imbalance, extra overhead and delay brought by the increase of the hop number when designing energy-aware routing scheme. This paper presents a novel routing scheme (Cooperative Robust...
High dense dust and gas in the underground environment or in the long distance tunnel is harmful and dangerous to the workers and drivers. Based on wireless sensor network we use a hybrid monitoring system to realize real-time and unmanned guard monitoring and lowering the potential safety hazard. We analyze the energy efficiency of S-MAC, T-MAC and B-MAC. The simulation results show that B-MAC is...
It is widely known that in wireless sensor networks (WSN), energy efficiency is of utmost importance. WSN need to be energy efficient but also need to provide better performance, particularly latency. A common protocol design guideline has been to trade off some performance metrics such as throughput and delay for energy. This paper presents a novel MAC (Express Energy Efficient Media Access Control)...
Due to uncertainties in target motion and limited sensing regions of sensors, collaborative target tracking in wireless sensor networks (WSNs) suffers from low tracking accuracy and lack of reliability when a target cannot be detected by a scheduled sensor. Generally, actuating multiple sensors can achieve better tracking performance but with high energy consumption. Tracking accuracy, reliability,...
In wireless sensor network studies the main objective is minimizing the energy consumption so that the lifetime is maximized under the limited battery capacity constraints. In most event-driven surveillance applications, the end-to-end delay should also be minimized. In this paper we present a new EDO-MAC (energy and delay optimization Media Access Control) which reaches a good balance between energy...
The network capacity is a focus of current research on wireless ad hoc networks, and the study of capacity concentrates on two facets: one is how to increase networks capacity by using different methods and new technologies; another is to derive bounds of networks capacity with different transmission models proposed via several suppositions. Under the protocol models and physical models of communication...
An LEO satellite network model based on mobile agent is mentioned. In the network model, two shortest path algorithms are proposed. For information communication, a shortest path algorithm based on Dijkstra algorithm is proposed. For deploying routing tables, a shortest path algorithm named diffuser algorithm is demonstrated. Simulation results show the feasibility of the LEO satellite network model...
Color feature of an image is one of the most common used features in content-based image retrieval (CBIR) systems. Combining the traditional colorhistogram with some spatial information will greatly increase the accuracy of color features. One advantage of color feature is that it is independent to the distortion of an image. However, with the introduction of the spatial information, this advantage...
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