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In this paper, a fault diagnosis and accommodation control scheme is designed, which is applicable to mechanical systems. First, the fault detection is developed by designing a nonlinear observer. Second, the fault isolation is achieved by using multiple fault observers. Third, when a fault is diagnosed, an adequate fault accommodation control is triggered to compensate the effects of the fault function...
Robotic systems are widely used in industry. Preventive maintenance of electrical machine systems plays a very important role in the industrial life. This requires monitoring their operations on-line which can detect a fault as it occurs and diagnosing the malfunction of a faulty component. In this paper, we present a fault diagnosis method for robotic systems. First, the fault monitoring is designed...
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...
This paper proposes a wireless network security evaluation method based on Fuzzy-AHP (Analytic Hierarchy Process) with variable weight. In this paper, we first design the evaluation index system based on characteristics of wireless networks, and then analyze each uncertainty measured by the Fuzzy-AHP method, and introduce variable weight theory into Fuzzy-AHP method to address the difficulty of weight...
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...
Compressed sensing (CS) is an emerging field based on the revelation that a small collection of linear projections of a sparse signal contains enough information for reconstruction. It holds valuable implications for wireless sensor networks because power and bandwidth are limited resources. In this paper, applying the theory of compressed sensing to the practical sensor network data recovery problem,...
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...
Time-slot synchronization is very important for a TDMA-based Ad Hoc Network. In this paper, we propose a decentralized algorithm to synchronize the local time slot reference. The differences between the time slots of neighboring nodes with consideration of signal propagation delay are used to compute the slot adjustment. The methods on how to choose parameters are also discussed. Simulation experiments...
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...
With the rapid development of wireless mesh networks (WMNs) technology, more and more commercial products and even solutions are provided in trial applications. Especially, the 802.11-based WMNs are considered as one of the best networking technology to extend the coverage of wireless LAN. However, few practical optimization tools are available for the planning and design of commercial WMNs. In this...
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...
Wireless Mesh Networks (WMNs) are a promising technology for next generation wireless networking. Hybrid WMNs, the combination of backbone and client WMNs, are considered as the most applicable case. In this paper, the impact of mesh backbone scheme on the capacity of hybrid WMNs is analyzed in terms of both the per router throughput capacity and the per client throughput capacity. Furthermore, the...
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