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This paper presents a optimization algorithm to improve the positioning accuracy of the nodes in wireless sensor networks, and introduces RSSI-based (Received Signal Strength Indicator) wireless location technology on formation of multiple mobile robots. First, the RSSI value, which is measured between mobile node and reference node, is optimized by Gaussian model. At the same time, using the classical...
In spite of the widespread use of Computer Aided Design (CAD) systems for design and Computer Aided Analysis (CAE) systems for analysis, the two processes are not well integrated because CAD and CAE models inherently use different types of geometric models and there currently exists no generic, unified model that allows both design and analysis information to be specified and shared. In this paper,...
Recognition of machining features from the solid model of product is the foundation of process planning, manufacturability evaluation and other downstream activities. In this paper, the method of feature recognition from the STEP file is studied. On the basis of analyzing the grammar characteristic, geometric and topological information in STEP file, the lexical analyzer is designed by using the object-oriented...
A proxy blind signature protocol using quantum entanglement state for signature and verification was proposed, while nonorthogonal quantum state encoded proxy warrant message. The quantum key distribution and one-time pad encryption algorithm guaranteed the unconditional security and the message owner's anonymity.
This paper addresses the problem of generating tool path for free form surface machining with optimized tool path topology while the machining efficiency is maximized as much as possible. After revisiting the problems of current tool path generation method, a functional optimization problem with linear filtering is formulated for deriving an approximation direction field which can capture the global...
The radio fuze signal is always buried in the noise, so it is difficult to detect useful information. A new method based on the chaotic theory is introduced to detect the radio fuze signal buried in the strong noise. Starting from the analysis of the chaotic detection theory, we established the chaotic system of the radio fuze signal, analyzed the influence for chaotic system from the radio fuze signal,...
A novel on-line monitoring and fault diagnosis system of power transformer using basic principle of three ratio method based on DGA (Dissolved Gases Analysis) and PNN(Probabilistic Neural Networks) for engineering application is proposed. According to tested dissolved gases contents changing characteristic of transformer oils under different transformer working conditions, the five characteristics...
In order to satisfy the needs of comprehensive and accurate performance test for CPS (Control and Protective Switching), an automatic performance test system was studied in this paper. The hardware structure and software was introduced in detail; the hardware system was made up of the industrial control computer, the three-phase current generator, adjustable single-phase power, pneumatic fixture,...
The walking procedure of the cattle on a paddy field before spring plowing was captured by the high-speed photography. The properties of the paddy soil used for tests and the geometrical configurations of the hooves of the cattle were examined. Combined with the fitted curve, the graphs of joint angle were drawn. The changes of the joint angles and the orientations of all limbs were analyzed, and...
A portable device for the measurement of the reflectivity of radar absorbing coating is presented. It is based on the swept frequency RCS method. Using of this device is simple, quick and convenient than the conventional methods, as well with higher precision and more stable in performance than the other portable solutions. The design flow of this device is presented and the test results are analysed.
In this paper, Ant Colony Algorithm, (ACA) is taken as the research object. According to its characteristics, improvement of algorithm and application is made and obtains a good result. Using the parameters of the algorithm in the theoretical analysis, the qualitative parameters of the algorithm is given in the scope of the conclusions based on the optimized settings. Finally, the improved algorithm...
In order to offer security for multicast applications, the group key has to be changed whenever a user joins or leaves the group. At present, there are two re-keying strategies: individual re-keying and batch re-keying. Individual re-keying method has the problems of inefficient and out-of-sync. Batch re-keying method alleviates these problems, but this method ignores the change probabilities of members...
To realize intelligent integrated of vehicle chassis system, multi-agent theory applied in cooperative control of suspension and steering subsystems. This paper built out suspension agent, steering agent, cooperation agent, and described their structures and attributes. Put up chassis cooperative control framework according cooperative processes of multi-agent. Query simulation of multi-agent was...
The synchronous mechanism of the phase for the vibratory machine with twin-motor drives rotating in the same direction is discussed by the virtue of the force analysis for the eccentric lumps and computer simulations in this paper. The observer of the difference between the two eccentric lumps is designed by using the two acceleration signs measured from the two symmetrical positions in the machine...
The 3-D region of operational ability of astronaut's hands in spacesuit is needed for Extra-vehicular activity (EVA). A Combined Coordinate Measuring System (CCMS) to test the operation ability of people in the spacesuit was developed. The CCMS was designed with a 3-jointed mechanical measuring arm, with combined force-torque sensors and magnetic brakes installed in every joint. The CCMS measured...
Cross-layer breaks away from traditional network design, which can adapt to the dynamically variable wireless channel characters to improve the wireless communication system performance. In this paper, an adaptive cross-layer scheme (Beamforming-MIMO) for multi-user system is proposed, which combine multilevel adaptive modulation (AM) at physical layer with truncated automatic repeat request (ARQ)...
A new frequency characteristic test method is proposed based on the digitization characteristics of optoelectronic platform servo system. First a digital processing controller is used to automatically test the entire process and tested data are uploaded to a PC through CAN-bus, and then the tested data are transferred into accurate transfer function with the Levy method. Here we discuss the testing...
Paper presents the idea of DSP development based on Matlab environment. Introduce the possibility of realization using Matlab and DSP. Summarize the function of Matlab toolbox to realize the idea. Finally, in application of Tracking System, simulation mode is set up based on the Matlab environment. With the toolkit of Matlab, convert simulation model into executable code. complete the TV Tracking...
The paper researched the control strategy of STATCOM with LCL filter. The STATCOM sixth orders differential equations in dq coordinate separated to two parts. Invert system theory deals with their uncoupling and nonlinearity. Then the sliding mode control strategies were used to the differential equations. Finally simulation results show validity and effectiveness of the design by comparing with PI...
This paper designs a wireless power meter system based on GSM network; the main communication way is GPRS and secondary SMS. The user can choose the different transfer modules based on different demands and can choose the Local network, dial network, ISDN, ADSL to connect into network. It accomplishes the hardware and software design in GSM network collector and the meter system software.
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