Advanced Materials Research Vols. 433-440

Abstract: Nowadays there are a few works which are concerned with the virtualization technology and the fault-tolerance technology, because virtualization system can provide an environment allowing multiple operating systems running in concurrent way. In this paper, we based on a real-time hypervisor-XtratuM, propose the architecture of a fault-tolerant real-time control system (XFTRTS), which provide local backup execution and to support different level diversity including N-version programming on a single host. Furthermore, we implement a prototype of XFTRTS and test its important performance metric–latency, which is within two microseconds.

Abstract: Networked control systems with single-rate mode means the sampling periods of sensor, controller and actuator are the same. Networked control systems with multi-rate mode means the sampling periods of sensor, controller and actuator are not the same. Networked control systems with single-rate mode are called single-rate networked control systems; networked control systems with multi-rate mode are called multi-rate networked control systems. The optimal estimator and LQG output feedback controller of multi-rate linear networked control systems are presented when the system has partial state information. The LQG output feedback controllers are proved to render corresponding closed-loop networked control systems exponentially mean square stable on some wild conditions. The separation theorem is proved to still hold in such multi-rate networked control systems.

Abstract: Feedback control systems wherein the control loops are closed through a real-time network are called networked control systems. Under some special conditions proposed in literature, the networked control systems with stochastic time delay can be transformed a deterministic system with a constant delay. Based on linear time invariant discrete time process, the robust stability of deterministic networked control systems is analyzed and the designing method of robust state feedback controller for deterministic networked control systems is proposed in this paper for the first time. An example is given to verify the theory results of this paper.

Abstract: Data Structure is the specialized core course for students majoring in Information Science. It is very important for students to study succesor courses and enhance their programming level. This paper presented the authors’ actual achievement in research and practice of dynamic synchronous visual teaching system for Data Structure algorithms.

Abstract: Noises of infrared detector have an important influence on sensitivity of infrared imaging system, and it affect the imaging quality and performance of infrared system. Research on noises of infrared detector is a challenging topic in designing, simulating and evaluating of infrared imaging system. All kinds of noises are studied in detail, and mathematical models are built. The method of simulating noises of detector is proposed, and noises are simulated based on the mathematical model.

Abstract: That Support Vector Machines applies to image recognition have good results，But the kernel function C and parameters of the SVM which influence the result and performance has not been decided. Against this question, this paper bring forward a new algorithm that combines SVM with GA to classify and uses GA to select excellent kernel function, the results of experiment show Image Recognition based on SVM and GA are effective.

Abstract: Combined with the characteristics of multibeam bathymetric data and grey scale image, this paper proposed an algorithm of mutlibeam data registration based on false grey scale double-zone matching. By analyzing the original grey normalized matching algorithm, this paper improved the original algorithm by adding another matching zone, and then deals the mutlibeam data with the algorithm of false grey scale and the new method this paper proposed. Finally, verified the new algorithm both on theory and simulation, and evaluated the running speed of the algorithm. The simulation results showed that the algorithm did improve the speed of program, which meets the requirement of real-time in multibeam data matching better.

Abstract: The urban road network is abstracted as a directed graph in this paper，according to the theory of graph theory. It uses depth-first traversal algorithm of graph，and combining with Dijkstra shortest path algorithm，futhermore ,these two algorithms are improved，so that , the model of this regional division are built which on city roads for patrol’s police Alarm practical speed and distance as the verification conditions，we propose an efficient program for the city police patrol.

Abstract: In order to improve the accuracy, stability and rapidity of response, the paper built the mathematic model, and designed the high order system following the low order model based on Popov Hyperstable theory. Then applied this control method and PID method in actual system, compared them in time domain response. The result approves that the system owns better rapid and stable characteristics, satisfying the requirement when the direct drive electronic-hydraulic position control system changes its conditions. Further, improves that the theory is correct, certificates that the MRAC is very adaptive to the direct drive electronic-hydraulic servo system.

Abstract: In this paper, all links of the Design and Realization of VOD System Based on Campus Network of Hebei Normal University of Science &Technology is researched. First of all, the paper analyses the system requirements, proposes the design ideas and objectives and gives the system design and Entirety functional block diagram. Then the paper gives a more detailed design of complete system. In the end, a system is completed. To ensure the quality of VOD, increase the number of the server that respond to customer service, browse fast and search video files, the system uses many technology such as intelligent video technology, multi-level admission control scheme and a variety of scheduling options and the dynamic tree traversal video files.