Applied Mechanics and Materials Vols. 519-520

Abstract: Shadowing model has been widely used in the ranging technique based on RSSI (received signal strength indicator). However, in the actual ranging, the signal will be subjected to the interference of various factors in the environment. The accuracy of the algorithm is not ideal. This article uses the least squares fitting function method, with the limited number of sampled data to piecewise fitting for a continuous polynomial function, and ultimately to simulate the attenuation of the signal of the actual environment. Experiments using the algorithm, the experimental results show that the ranging accuracy is significantly improved.

Abstract: Expounded research background and significance of Poyang Lake smart water resource monitoring, proposed a new theory research framework of Poyang Lake smart water resource monitoring based on WSN and 3S spatial information technologies, explored the related basic theories and methods which applied to the research of water resource smart monitoring, summarized the key issues in the researches of building wireless sensor network architecture and multi-sensor fusion physics platform for Poyang Lake water resource monitoring, methods of multi-sensor information extraction, access, processing and storage, the Poyang Lake water monitoring information spatializiation methods, multi-sensor data anomaly detection methods, and gave the research ideas and problem-solving strategies. Eventually, through the establishment of a practical and reliable Poyang Lake smart water resource monitoring system, improve flexibility, real-time, space visibility of water resource monitoring.

Abstract: Navigation type GPS cheap, portable and measure quickly. But the accuracy is not high. We can through the rank-defect free net adjustment method of navigation type to carry on the adjustment, the coordinates of GPS measurement to improve the accuracy of it. So we can improve the navigation type GPS in agriculture in terms of practical measurement.

Abstract: An improved congestion control mechanism based on mobile agent for wireless sensor networks is proposed, which includes node-level congestion and link-level congestion control. The formers congestion information is collected and distributed by mobile agents (MA). When mobile agent travels through the networks, it can select a less-loaded neighbor node as its next hop and update the routing table according to the nodes congestion status. Minimum package of node outgoing traffic was preferentially transmitted in the link-level congestion. Simulation result shows that proposed mechanism attains high delivery ratio and throughput with reduced delay when compared with the existing technique.

Abstract: Data theft and node attack in wireless sensor networks causes great damage to the networks and the attacker destroys network and obtains the data of the network by malicious nodes distributed in the network. Therefore, it is necessary to detect these malicious nodes and to eliminate their influence. We propose a distributed malicious nodes detection protocol which called BMND based on Bayesian voting, every node determine its suspected malicious nodes by its request message and abnormal behavior. Also, we determine the malicious nodes by Bayesian voting, so that the network can protect itself from such malicious nodes influence. The simulation results show that our algorithm has good performance in both the detection rate and false positive rate.

Abstract: We present a novel high-throughput imaging spectrometer based on over-scanning. The traditional slit-based spectrometer cannot gather enough radiation while the source is too weak. A much wider slit is used to replace the narrow one in traditional spectrometer. Too much wide slit will cause overlapping between different wavelength lights. In order to reconstruct super-resolution spectrum of source, over-scanning is employed which is realized by high precision electromechanical device. Experiments show that the reconstructed spectrum achieved a much higher resolution than original data meanwhile the throughput has improved significantly.

Abstract: PC often uses HostLink protocol to communicate with Omron PLC through serial port. In Labview, HostLink protocol implementation using DLL method has some disadvantages: messy interfaces and consideration of compatibility between different programming languages. This paper introduces the HostLink communication protocol, describes the native implementation of HostLink in LabVIEW in detail which overcomes the above shortcomings.

Abstract: This paper proposes an improved CS algorithm for WSN environmental monitoring. First, the algorithm applys approximate joint sparsity model (JSM) to analyze data. Further, with the improved clustering routing data gathering, that is, within each cluster applying CS-based data gathering methods, and cluster headers using the shortest path routing to sink node. Extensive simulation results show that this approach not only shrinks the distribution range of data processing to reduce recovery error, but greatly lessens numbers of data transmission times to maintain energy balance of the entire network.

Abstract: Based on the SITE algorithm, this paper proposed a wireless sensor network node coverage discrimination model based on the average distance of neighbor node (ADDM), which can discriminate whether the node is redundant node or not by computing the average distance of the neighbor nodes and the radius angle of overlap area. Theoretical analysis and simulation results showed that the ADDM algorithm better to improve the SITE algorithm, resolve the shortage that the SITE algorithm neglects the effect of the node of distance is greater than the radius of perception, realize the regional coverage with fewer nodes, So as to prolong the network life time.

Abstract: A sedimentary microfacies identification algorithm based on activity layering is proposed in this paper. The changed features of well curve from a group of log response data, the features are used to divide the stratum section into several electrofacies, a mapping relation model is constructed, and the sedimentary microfacies is identified automatically. The experimental result shows the validity of the proposed algorithm.