Applied Mechanics and Materials Vols. 325-326

Abstract: The small world network has higher convergence coefficient and shorter average path length. This paper introduce small world theory to the wireless sensor network, and propose a topology control algorithm of wireless sensor network based on NW small world network model. The design of algorithm is hierarchical, which include formation of super node ring, common node join clusters, maintenance the load balance of common node in cluster, and maintenance the super node ring when super node is failure. The experiment shows that the topology control algorithm has the characteristics of small world network, the network connectivity is good, and the lifetime of wireless sensor network is prolonged.

Abstract: For symmetric key-based key distribution techniques will not completely solve the security problem of key distribution in wireless sensor networks, a public key with certificate-based key pre-distribution scheme, the base station using a series of original public key and a single collection to the hash function to produce a public key, and for each node were randomly assigned to a subset of public and private key and public key set. Private key only, the program can not only improve the safety performance of the network, but also improve the storage overhead of the network. The program compared with the traditional key pre-distribution scheme, both to ensure the security of the network, both network and node resources are limited practical under the premise of constant connectivity, network security and network scalability margin to improve.

Abstract: Multi-path routing is an important routing method for wireless sensor networks, which can ensure the reliability of data transmission, balance the consumption of nodes energy, meet the network service quality, etc. But it cant effectively resist the attacks from malicious node.This paper proposes a secure multipath routing algorithm based on trust model, which can effectively achieve the secure routing of wireless sensor network. The algorithm make trust evaluation for cluster head nodes, and use nodes trust value to measure the reliability of next hop node, then calculate the number of multipath that meet the expected secure requirement, so as to build the trust multipath routing. The simulation results show that the algorithm can effectively reduce the consumption of energy, prolong the lifetime of network, and ensure the routing security of wireless sensor network.

Abstract: Progress as well as integration of wireless communication technology, computer technology and semiconductor technology, can integrate information such as the perception,acquisition and data processing in a very limited volume [. With the rapid development of wireless technology,wireless sensor networks greatly extends the applications of sensor network and Internet of Things as well as the new challenges to wireless communication technology. We will use STC12LE4052AD microcontroller and ultra-low power radio frequency chip nRF24AP2 embedded ANT protocol stack to complete the development of wireless sensor nodes in this paper.

Abstract: It is a challenging issue to develop optimal real-time target tracking methods for automobile in the small areas such as urban and indoor environments. In order to get comprehensive navigation information, a target tracking system utilizing ultrasound and machine vision is proposed. In this system, the position, velocity and the yaw in the relative coordinate are used as the state variables, the ultrasound is used to measure the distance between the reference node and the blind node, and the yaw of the automobile is measured by the machine vision. Then, the extended Kalman filter is used to fuse the information measured from local estimators in the proposed method. Simulations show that the position error of the proposed approach is about 0.2m and the velocity error of the proposed approach is about 0.1 m/s.

Abstract: Small-world networks have the higher clustering coefficient and shorter average path length. According to the design requirements of topology and routing algorithm of the WSN, we apply small world theory into the WSN, and propose the routing algorithm based on Newman Watts small-world network model. This algorithm judge the cluster number whether same to decide the communication type. Data is transmitted to super node firstly, and then the packets are sent by the shortest transmission paths which get from the super node ring. Experiments show that the routing algorithm improves the network throughput and network transmission efficiency, the common node energy consumption become small, so the service life of wireless sensor network is prolonged.

Abstract: Applications of wireless sensor networks (WSN) in freeway information monitoring are rapidly expanded. The freeway optimal sensing coverage and efficient energy consumption problems are the fundamental requirement for the freeway information monitoring systems based on WSN. This paper firstly surveys the coverage model which is considering the sensing range of sensors and the width of the freeway. And then analyzes the system energy consumption performance based on this coverage model. The result shows that the network lifespan is very bad because the imbalance energy consumption. Therefore, several improved strategies are discussed in detail, which are to balance the energy consumption and prolong the network life span through increasing appropriate sensor nodes on the both sides of freeway and scheduling these redundant nodes to sleep mode.

Abstract: In order to improve the guidance accuracy of long-range rockets, a GPS/INS integrated navigation method with combination of position, velocity and attitude was applied. The GPS/INS integrated navigation system taking the position and velocity from INS and attitude from GPS as observables was studied. The error model of system was established and the Kalman filter was designed. A 6-DOF trajectory simulation was put forward and the correction capability of the INS measurement error by using GPS attitude measurement information was analyzed. The simulation results verify the feasibility and effectiveness of the integrated navigation method.

Abstract: Retracted paper: The improvement of 802.11 mesh networks is a robust quagmire. In this work, we show the construction of link-level acknowledgements. In order to answer this grand challenge, we use linear-time epistemologies to disconfirm that 802.11 mesh networks and architecture can collaborate to fix this riddle.

Abstract: In this paper a human upper limb robotic system is analyzed through an experimental study. The experimental analysis aim is to validate this robotic system type in order to use it in some kinetotherapy programs for the human upper limb recovery. The robotic system experimental research was performed by using special equipment called CONTEMPLAS which enables to evaluate angular variations in 3D environment. The equipment used in this research has two high-speed cameras which can record and establish the angular variations developed at the robotic system joints level. This paper consists of three main parts. In the first part there is an actual study of the robotic systems specially designed for the human upper limb rehabilitation, where the robotic system proposed for this experimental research is described. The second part includes some literature aspects regarding the movements developed by the human upper limb, and in the third part the experimental research is described in detail.