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Wireless sensor networks (WSN) have emerged as an interesting and important research area in the last few years. Time synchronization is a critical middleware service of distributed system. In particular, wireless sensor networks is a distributed system which makes extensive use of synchronized time in many contexts (e.g. for data fusion, TDMA schedules, synchronized sleep periods, etc.). In addition,...
The application of wireless sensor transient field measurement network trying to get high data sampling rate, high fidelity data by using wireless sensor node, with the constrain of wireless communication bandwidth and energy consumption. Smart and compact routing is a critical issue in this system, which plays a role of middleware in sensor network software architecture. The route select estimator...
Cease's transaction cost theory holds that enterprise and market are two organizational forms of transaction which can be mutually substituted.This paper, through the analysis on the role of enterprise and market in resource allocation, reachs that these two organizational forms of transaction do not only substitute, but also complement each other; and then introduce intermediary organization, expand...
They had an in-depth study on microcosmic formation mechanism of sedimentary fund of third-party payment platform, and emphatically analyzed main sources of sedimentary fund and main factors which impact the scale of sedimentary fund. On this basis, They proposed a measure model of sedimentary fund of the third party payment platform based on population model and estimated the scale of sedimentary...
A localization algorithm using arrays with special geography for wireless sensor networks is discussed in this paper. The algorithm is based on the assumption of small aperture. The sensors are divided into several groups. Each group has a special geography. Firstly, the bearing information such as azimuth and elevation are estimated according to the time delay of arrivals. The estimate result in...
In this paper, a new collision detection algorithm based on simulated annealing algorithm which is effective in searching optimal solution is presented. Basic principle of this new collision detection algorithm is as follows: The time variant parameter used for establishing objective function based on kinetic equation of missile and attacked objective is extracted firstly; Secondly, objective function...
To test and measure the field signal, the nodes of wireless measuring system are necessarily deployed in the signal source area. The nodes must cooperate with other nodes to sample the field signal at one same time, so the starting sampling action in the system needs one actuate time benchmark. Therefore a special approach based on wireless mode is proposed in this paper to provide the actuate time...
How to design the flight control system (FCS) of small-scale unmanned helicopter is still a difficult challenge today. In this paper, one novel control approach based on Multivariable PID Neural Network (MPIDNN) was firstly used to design the FCS of small-scale unmanned helicopter. MPIDNN is suitable for controlling the multi-input multi-output (MIMO), nonlinear, highly coupled, uncertain and dynamic...
Time synchronization is a critical middleware service of distributed system. In particular, wireless sensor networks is a distributed system which makes extensive use of synchronized time in many contexts (e.g. for data fusion, TDMA schedules, synchronized sleep periods, etc.). In addition, synchronization precision has become a critical area of research today. Time synchronization with very high...
Based on the ZigBee wireless network, a park lighting control and child location tracking system is designed in this paper. Considering that there may be a number of children that needs to be tracked concurrently, distributed localization is needed, so an improved RSSI-based algorithm is introduced in this paper. As a goal of our system, the new method, unlike commercial digital-hardware-block based...
To design the flight control system (FCS) of small-scale unmanned helicopter is still a difficult challenge today. The hardware and software architecture of FCS was designed in this paper. And one novel control approach based on multivariable PID neural network (MPIDNN) was firstly used to design the FCS of small-scale unmanned helicopter on the hardware platform. MPIDNN is suitable for controlling...
It has set up a mathematics model of VRP problem with time windows and has proposed a kind of improved immune genetic algorithm. On the basis of the standard genetic algorithm, it joins in the self-adaptation cross operator and heuristic mutation operator based on triangle show, and uses niche technique to improve the immune algorithm. The experimental result indicates that this algorithm has better...
Runaway escapement as the core of clock safety and arming device is a kind of common time-delay mechanism in fuze of projectile. In recent decades, computer design of runaway escapement has been studied in depth, and various forms of research results have been vended. These results focused on the mechanismpsilas kinematics, precision and optimal design, and its vibration analysis seldom mentioned...
The monolithic high-shock three-axis piezoresistive accelerometer has the advantages of smaller bulk and less axis-alignment error and so on. However, because of the complexity of the accelerometer design such as multi-dimension coupling, the longitudinal and transverse overload, natural frequency, maximum deflection and other constraints for high-shock applications, it's useful to use optimization...
The gateway realizes the fusion of wireless sensor network and external network. Some low performance gateways cannot meet the requirement of surge data collection. Consequently, a gateway that based on PXA270, using embedded Linux is designed to meet the requirement. To protect the data that transmitted by Ethernet through the gateway, a TCP/IP strategy is constituted, which can reduce the probability...
With the development of enterprises businesses and the need of international convergence, the enterprises of China need to import mature technologies so as to improve their own management course, rise the management level, and need to certificate their own management system to provide confidence and assurance for customers. All kinds of ISO systems need to manage a large number of documents, and people...
The usual wireless sensor network based on MCU (micro-control unit) is not suitable to test fast changing signals. We designed an intelligent wireless test and measurement system based on wireless sensor network, which can be applied to measure the fast dynamic signals. Changeable sampling rate is designed according to the specific application background in this system. CPLD (complex programmable...
In order to overcome the drawback of classical particle swarm optimization (PSO) such as being subject to being poor in performance of precision and falling into local optimization, a modified PSO is proposed by inducing adaptive mutation operator and selection operator of in PSO. The selection operator of Genetic Algorithms (GA) can improve the fitness of the particle swarm to enhance the searching...
Wireless sensor networks are booming today. However the usual wireless sensor networks based on MCU are not suitable to measure fast dynamic signals. In this paper, the wireless sensor network provides a novel measurement for dynamic field systems. We designed an intelligent wireless field measurement system (WFMS) based on wireless sensor networks, which can be applied to measure the fast dynamic...
Cooperative technology applied in testing and measurement field was presented in this paper. In order to test and measure the field signal, the nodes of wireless sensor networks are necessarily deployed in the testing area of the signal source. The nodes must cooperate with other nodes to complete the field measuring task. A special approach based on wireless mode is proposed in this paper. This approach...
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