Advanced Materials Research Vols. 546-547

Abstract: Research on the new method of resolving terrain contour matching of terrain protracting algorithm based on RSG and TIN provides basic data structure. The concept of Area of Interesting (AOI) is introduced, the algorithm of estimation and detection is also proposed to calculate reference point; The method comprised centroid constrained and intervisibility estimation achieves terrain contour matching calculation avoiding those problems such as low-efficiency of point inquiry, embeddability of moving object and terrain and the change of target’s stance. Experimental results show that this algorithm could not only keep the existing display performance but also make the model matching more conformed to the principles of nature and improve the reality of virtual environment effectively.

Abstract: Using conventional passive resistance box to verify Pt100 platinum thermal resistance, Listing Temperature and Pt100 platinum resistance must be remember by users. It is difficult to manipulate. Temperature verifier based on single-chip microcomputer is small, high accuracy, multi-output, temperature and resistance comparison, which can improve production efficiency considerably.

Abstract: This project is purposed to design an air purifier based on composite photocatalyst technique. Photocatalyst could work normally only in limited condition with ultraviolet light and light intensity strong enough. In order to overcome the deficiencies above, this project uses composite photocatalyst technique to improve purification efficiency of the air purifier. The composite photocatalyst technique comprehensively combines photocatalyst technique and traditional air purification technology. Moreover, the utilization of multi-thread algorithm has decreased the response time of this design to great extent. The brushless direct current motor without hall sensor charged by direct current frequency conversion technique decreases the noise of the air purifier, prolongs its life, and protects environment by saving energy.

Abstract: Due to the precision of MEMS gyroscope is currently low level, even in low precision dynamic attitude measurement system, its error is also need to be estimated and compensated. Random drift is the one of the most important factor affects MEMS Gyro’s precision. At the same time, it is a non-stationary, weak non-linear and time-variant random signal. For improving precision of gyro and reducing effects of random drift, this paper used gray GM(1, 1) model to extract established tendency signal, and used power spectral density (PSD) to identify and extract the hidden periodic weak signal, then used ARMA method to model gyro’s random drift. As the example of LCG50 MEMS gyro, the simulation experimental results show that using this method can reduce the random drift and enhance precision of gyro.

Abstract: In general, the failure diagnosis and maintenance work of mechatronical equipments have greater difficulty, especially for less experienced technician. However, with the rapid development of science and technology, the mathematical analysis and computer can help us. So, According to the principle, structures and fault characteristics of mechatronical equipments, a method based on combination of the mathematical logic analysis theory and VB software is proposed. The principle of fault diagnosis methods, procedures and examples are included in this article. The results show that the method can effectively improve the efficiency and reduce errors caused by the additional diagnosis of faults.

Abstract: In order to enhance the operating speed and reduce the occupied memory space and filter out irrelevant or lower degree of features, feature selection algorithms must be used. However, most of existing feature selection methods are serial and are inefficient timely to be applied to massive text data sets, so it is a hotspot how to improve efficiency of feature selection by means of parallel thinking. This paper presented a feature selection method based on Parallel Binary Immune Quantum-Behaved Particle Swarm Optimization (PBIQPSO). The presented method uses the Binary Immune Quantum-Behaved Particle Swarm Optimization to select feature subset, takes advantage of multiple computing nodes to enhance time efficiency, so can acquire quickly the feature subsets which are more representative. Experimental results show that the method is effective.

Abstract: On the basis of in-depth study of the power system enterprise applications with distributed and heterogeneous characteristics, a solution to cope with an integrated data conversation platform is proposed against the background of power dispatching automation system which the data modeling and software component interface is not mature enough. This article also gives software design methods based on the CORBA specification and IEC 61970 standards for power system automation and elaborated the task execution flow of generic data access (GDA); at last corresponding test is also given. At the same time the development process for CORBA object services, resources sequence caching, distributed object calls and other important issues are given a detailed solution.

Abstract: The autonomous land vehicle localization is crucial for navigation, local path planning and position control in urban environments. The Video Compass method is proposed for autonomous land vehicle in this paper. First, the lane marking information from monocular camera is extracted. Second, the change of vanishing point is calculated from the lane markings. Third, with the above two conditions the autonomous land vehicle absolute direction could be deduced. This is the technique of the Video Compass proposed in this paper. Finally, the localization is calculated by the Video Compass and the wheel encoder. The algorithm presented in this paper is proved to be both robust and fast by experiments.

Abstract: System analysis is the most important Part of the software life cycle. A successful software system is always based on good analysis. Modeling with UML has become a trend in object-oriented analysis and design. This paper firstly discusses object-oriented software development process based on UML (Unified Modeling Language), then describes in details object-oriented software design process, and lastly applies the design process into business personnel management system.

Abstract: This document introduces the basic principle of the ELAC System (Elevator Aileron Computer System) working of A320 aircrafts, and mainly, analyzes the driving circuit of the ELAC computer for the flight control surfaces. Furthermore, introduces a real fault on line maintenance, analyze it and find out the reason, give some useful advice on A320 aircraft line maintenance.