Advanced Materials Research Vols. 962-965

Abstract: A Differential Transmitted Reference (DTR) system is analyzed for Ultra Wideband (UWB) communications in a multipath propagation environment with single user transmitted. In order to improve the data rate, The Time-Reversal technology is proposed for the DTR receiver in the paper, which can also resist the influence of Inter/intra Symbol Interference (ISI). Computer simulation is conducted in the presence of an IEEE802.15.3a CM2 channel with Scholtz’s pulse. Analysis and simulation are both shown that the TiR-DTR receiver can improve the data rate of UWB system.

Abstract: Using a order identification method based on wavelet transform to detect the positions of step disturbances, a adaptive control scheme of disturbance based on the order identification method is designed. The simulation shows that the controller can not only track the set point accurately, but also suppress the step disturbance appeared in different position timely. This control scheme is simple, effective and useful in engineering application.

Abstract: Focus on the weakness of modeling WSN topology by the means of random graph theory, a new weighted topology model of WSN based on random geometric theory is proposed in this paper. For the proposed new network model, the weighting scheme of network edge take into account the property of distance decreasing effect for communication signal. It also defines the differential weight which can embody the energy consumption for network communication. Based on simulations and calculations of the measures for the network topology as well as comparison with other forms of network, the results indicate that the proposed network topology model can not only describe the interrelated connected relationship between different nodes but also verify the degree of node is subject to Poisson distribution. It also has prominent clustering effects. These properties are consist with real world networks.

Abstract: An improved multi-objective genetic algorithm is proposed to solve constrained optimization problems. The constrained optimization problem is converted into a multi-objective optimization problem. In the evolution process, our algorithm is based on multi-objective technique, where the population is divided into dominated and non-dominated subpopulation. Arithmetic crossover operator is utilized for the randomly selected individuals from dominated and non-dominated subpopulation, respectively. The crossover operator can lead gradually the individuals to the extreme point and improve the local searching ability. Diversity mutation operator is introduced for non-dominated subpopulation. Through testing the performance of the proposed algorithm on 3 benchmark functions and 1 engineering optimization problems, and comparing with other meta-heuristics, the result of simulation shows that the proposed algorithm has great ability of global search. Keywords: multi-objective optimization;genetic algorithm;constrained optimization problem;engineering application

Abstract: An improved MUSIC algorithm based on third-order cyclic moment is proposed to estimate the bearing and range parameters of near-field cyclostationary sources. The algorithm adopts the uniform linear array, structures the third-order cyclic moment matrix by the array outputs, and utilizes the propagator method to replace the singular value decomposition, calculate the signal noise subspace directly. Compared with the traditional MUSIC algorithm, the proposed algorithm has high estimation precision and low computational complexity, and effectively solves the two-dimensional parameters estimation problems of near-field cyclostationary sources in the case of interfering signals and non-Gaussian white noise. The performance of the proposed method can be verified by computer simulations.

Abstract: With the constant emerging of novel Internet applications, weak real-time application has gradually become the mainstream of today's Internet business. According to the characteristics and requirements of weak real-time business, this paper conducts modeling analysis on disk scheduling of weak real-time I/O requests, and gets a multi-objective optimization model of this problem, and further puts forward a heuristic weak real-time business disk scheduling strategy WRT-DSS. Experiments show that the WRT-DSS strategy can take both quality of service and throughput performance of disk storage system into consideration. According to the demand of practical scenario, WRT-DSS can make an appropriate tradeoff on the system real-time and throughput performance via the flexible adjustment of the weighting coefficients.

Abstract: The intelligent anti-disoperation operation order system is developed. The system is established on operation management system (OMS). OMS provides the underlying technology support for operation order system. The supports of OMS include basic resources such as graphics, device, topology, the integration of real-time data sources, and the interfaces with external systems and so on. The full process management of operation order as well as operation security checking function based on automation system are realized. The system is composed of the relevant servers of OMS, communication server of local dispatch center, dispatcher workstations and other workstations, user workstations of substation, etc. The system is graphics, intelligent application system for dispatcher and supervisor. It is mainly used to many functions such as intelligent operation order generating, multilayered security checking of operating instructions, operation order management in accordance with procedure, offline operation order generating, operation training, etc.

Abstract: By using modern television technology, we could create great film and television works by combine the technology and the film art perfectly. The movie Avatar lead a revolution of television technology. In this article, we will focus on the how to make film and television works which contain the Chinese culture.

Abstract: Abstract.As a pillar industry of the national economy, manufacturing is the centralized embodiment of the international competitiveness. Manufacturing industry in china has developed quickly and gotten lots of achievements in recent years. Nevertheless, compared with the developed countries, we still have great gaps, such as the improper ratio of the light and heavy industry,the lacking ability of market research and technical innovation, especially the out-dated concept of management which hinder the development of the manufacturing industry in our country seriously. Nowadays, the most widely used real-time system of management in manufacturing is the Manufacturing Execution system(MES for short). MES is a kind of production management technology and real-time information system facing manufacturing workshop,also is the management information system facing the workshop between the management system at the top and the control system at the bottom. Mobile computing is a kind of new arisen technology at the basis of the rapid development of mobile communication, the Internet, database, distributed computing technology and so on. Mobile computing technology will make the computer or other information intelligent terminal equipments transfer data and share resources in wireless environment.

Abstract: A new fuzzy multiple reference model adaptive control method combined with fuzzy select and conventional adaptive control is presented. To overcome the control difficulties which due to significant and unpredictable system parameter variations, fuzzy logic rules are designed to choose the suitable reference model. The new method is applied to control the speed servo system of dynamic model of BLDCM, and the simulation results show it works well with high dynamic performance and control precision under the condition of great change in reference speed and load torque.