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2000 Vol. 26, No. 4

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Radiolocation Technology in LA-CDMA Wireless Cellular Network
GAO Yan, LI Yong-hui, ZHANG Qi-shan
2000, 26(4): 373-376.
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Applications by the radiolocation technology in a code-division multiple access (CDMA) wireless cellular network are discussed, especially was used to manage fleet and vehicles in an Intelligent Traffic System (ITS) . In the LA-CDMA wireless communication system, a third generation communication sys...
Modeling and Implementing for Mobile Radio Fading Channel in IF Based on FPGA
GAO Yan, LI Yong-hui, ZHANG Qi-shan
2000, 26(4): 377-380.
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A device based in Field Programmable Logic Array(FPGA)to simulate the channel propagation characteristics of the ground mobile environment at Inter Frequency (IF) has been designed and implemented.This device allows the performance of a mobile radio unit to be evaluated in laboratory under controlle...
Optimal Period Interleaver for Turbo Codes
QI Feng, WANG Mu-zhong, SHAO Ding-rong, ZHANG Yan-zhong
2000, 26(4): 381-384.
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By analyzing the relation between input sequences and feedback polynomials, we find the reason why low-weight codewords for Turbo code are generated.The concept of optimal period interleavers for Turbo codes is introduced. A novel design scheme for interleavers used for Turbo codes is presented. The...
Public Traffic Information Management System in Intelligent Transport Systems
ZHANG Fei-zhou, YANG Dong-kai, FAN Yue-zu, SUN Xian-fang
2000, 26(4): 385-388.
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The contents of study and development in intelligent transport systems(ITS) in our country is introduced, and then the main ideas of public traffic information management system and its dynamic management are expatiated upon. The study and development of public traffic information management system ...
Study of Redundant Tasks Allocation for Distributed System
CHEN Xian-feng, QIU Li-hua, WANG Zhan-lin
2000, 26(4): 389-392.
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A tasks assignment algorithm for the distributed fault-tolerance system is presented, we considered the periodicity, redundancy,adaptability and importance degree of the simulation system tasks and the load balancing of the processors in the algorithm. The algorithm achieved the redundant distributi...
Optimization of In-Flight Shutdown Rate of Aero-Engine
BAI Guang-chen, WANG Yan-rong
2000, 26(4): 393-395.
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Optimization methods to control the in-flight shutdown rate and the maintenance cost of civil aero-engines are presented in this paper. The mathematical planing approach to determine the optimal in-flight shutdown rate of an aero-engine is developed, in which the lost expectation of in-flight shutdo...
Random Model of Fatigue Multi-Crack Propagation
ZHANG Jian-yu, FEI Bin-jun, ZHAO Li-bin
2000, 26(4): 396-399.
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Stochastic damage tolerance method based on the stochastic fracture mechanics is one of the most important aspects of design and evaluation technique of aircraft structure. Stochastic damage tolerance analysis model is constituted with random crack propagation model and reliability analysis model. T...
Research on Support Decision System(SDS) of Optimum Matching of Man-Machine Interface in Mechanical Systems
LIU Zhong-bao, DONG Su-jun, YAO Hong-wei
2000, 26(4): 400-403.
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Support decision system(SDS) of the optimum matching of man-machine interface in mechanical systems is made by using the theory of SDS. The multi-dimension adjustable simulator stand for the optimum matching of man-machine interface in mechanical system has been structured with the use of Computer a...
Nonlinear Flight Control Design for Supermaneuverable Aircraft
FAN Zi-qiang, FANG Zhen-ping
2000, 26(4): 404-407.
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The design of a flight control system for a supermaneuverable aircraft by means of nonlinear dynamic inversion was discussed in detail. First, the dynamics to be controlled are separated into fast and slow variables in terms of singular perturbation theory. The fast variables are the three angular r...
Investigation on Heat Transfer between Gas and Rubber Particles in Fixed Bed and Vibrated Fluidized Bed
WANG Xiao-xin, YUAN Xiu-gan
2000, 26(4): 408-411.
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The effect of parameters on radial heat conductive coefficient is analyzed by researching into radial heat conductivity of rubber particles in fixed bed. The fluidized bed should be applied to enhance the process of heat transfer between gas and solids in order to minimize the effect of lower heat c...
Vibrations of Stepped One-Way Rectangular Plates
ZHANG Ying-shi
2000, 26(4): 412-415.
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Vibrations of non-unitary materials n-step one-way rectangular plates are researched. Differential equations of free/forced vibrations for such plates are established by using singular functions, their general solutions solved with method of initial parameter. The traditional solvent of static and d...
Steric Effects in Rate Constants for Bimolecular Dissociation
ZHANG Jing-bai, LI Chun-xuan
2000, 26(4): 416-419.
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The steric effects for bimolecular dissociation were investigated via the collision theory, and a sterically dependent bimolecular dissociation model was established. In order to validate the developed model, the rate constants of typical reactions taken place in air under thermal equilibrium condit...
Confidence Level Analysis Method of Incomplete Fatigue Life
XIONG Jun-jiang, LIU Bao-cheng, ZOU Shang-wu, Shang Da-jing
2000, 26(4): 420-423.
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By means of the rank statistical method and the mean ranks of the incomplete fatigue life data, the distribution parameter estimation formulas are derived. After the mean and the standard deviation of the population distribution are deduced, the confidence limit of the incomplete fatigue life is pre...
Determination of Non-Linear Buckling Load for Simple Supported Beam with Bounded Initial Imperfection
TONG Zong-kai, WANG Shou-mei, QIU Zhi-ping
2000, 26(4): 424-427.
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A method to obtain non-linear buckling loads of simple supported beam with initial imperfection is presented,Which avoids differential equation sets initial value problems resulting from another definition of buckling load,and the proposed method save computational cost. Fourier series to describe i...
Data Treatment Expert System for Median Stochastic Load-Spectrum
YAN Chu-liang, ZHANG Shu-ming, YE Ge, GAO Zhen-tong
2000, 26(4): 428-431.
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The precondition of solving life prediction and life extension for airplane structures is to work out a typical load-time history, i.e. load-spectrum, which can simulate airplane's real service situation. This is the basis of theory analysis and whole-size structure fatigue test. In view of this, th...
Rules of Inference for Quantifiers in Discrete Mathematics
HE Zi-qiang
2000, 26(4): 432-434.
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The conditions satisfied for the existential instantiation and the universal generalization in the natural deduction system are described clear, whereas they are described rather vaguely in many textbooks on discrete mathematics. Contrasting with that the existential instantiation in some textbooks ...
Walkthrough and Interaction Technology for Virtual BUAA
HAO Ai-min, ZHANG Bei, ZHAO Qin-ping
2000, 26(4): 435-438.
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A layer construction of scene database for virtual BUAA(Beijing University of Aeronautics and Astronautics) campus has been put forward, a paging algorithm based on model control planes has been provided, three scene complexity simplification strategies of redundant modeling data simplification, tex...
Study on Seal of Gas Along Cylindrical Spiral Groove
CHEN Jian-ping, ZHAO Pi-zhi, WANG Zhi-shan
2000, 26(4): 439-442.
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The governing equation of gas cylindrical spiral groove is solved theoretically by the coordinate transformation from non-rectangle grid in computational area with complex shape to rectangle grid. The purpose of the transformation is to avoid re-forming grid while the structural parameters being cha...
Mesh Model Simplification Method Based on Volume Criterion
CHENG Ji-hua, FAN Yu-qing
2000, 26(4): 443-446.
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Model simplification is used in a variety of disciplines, such as virtual reality, CAD/CAM, dynamic simulation and so forth. This paper presents a new method to delete vertex of the mesh model, which is based on volume criterion. To decide whether certain vertex can be removed, the method uses the v...
Magnetic Field Numerical Calculation of Rectangular Poled Magnetic Fluid Sealing Device
ZHAO Guo-wei, CHI Chang-qing, WANG Zhi-shan
2000, 26(4): 447-450.
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Magnetic leakage is described accurately by magnetic propagation equation on the boundary of magnetic dielectric and non-linear magnetization characteristic of different magnetic dielectric is considered, the distribution of steady, non-linear and forced axial symmetry magnetic field in magnetic flu...
Experimental Study on a New Type of Combined Seal System
WANG Zhi-shan, CHEN Jian-ping, ZHAO Pi-zhi
2000, 26(4): 451-453.
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A new type of combined seal system with ferromagnetic flow and gas along cylindrical spiral groove is proposed in this paper. Based on the study of the two seals respectively, experiments on the combined seal system are carried out. Results show that the seal system has enough seal ability to fulfil...
Two Improvements to an Algorithm of Feature Recognition
XU Shi-xin
2000, 26(4): 454-456.
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Two improvements are discussed with regard to an important type of feature recognition algorithm, which is Falcidieno's algorithm. Firstly, when extracting the explicit features, the original algorithm cannot handle the case when protrusion features and depression features are adjacent. But the impr...
Partial Least-Squares Regressive Analysis and Modeling for Tool Wear
LIU Qiang
2000, 26(4): 457-460.
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The algorithm of partial least-squares regression(PLSR) is briefed firstly. The PLSR analysis is applied to the sample data sets of cutting tool wear under different machining conditions. Six independent variables for modeling including cutting speed V, cutting force components Fx, Fy and Fz, as wel...
Neural Network Approach to R&D Project Termination
LIU Quan, GUAN Jian-cheng
2000, 26(4): 461-464.
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In order to help manager to make termination decision for the ongoing R&D project timely and correctly, the authors review and compare the theory and methodology of termination decision from the literature. Furthermore, we discuss the considerable importance to identify attributes of an ongoing ...
Evaluations of Interface Management by Gray Cluster and Empirical Study
GUAN Jian-cheng, ZHANG Hua-sheng
2000, 26(4): 465-469.
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The interface management between R&D/Marketing and R&D/Production is essential to commercialization of S&T achievements and success of technological innovation. It is, however, very difficult to evaluate levels of the interface management for an enterprise during its innovative process. ...
Identification of Optimal Subspace from PLS Regression
WANG Hui-ping, LIU Qiang, TU Yong-ping
2000, 26(4): 473-476.
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Partial least-squares regression, a novel approach for multivariate analysis, is widely used for modeling a multi-collinear variable data set, with improved model accuracy and reliability based on building a subspace with most explanatory ability to the data set. In this paper the factor analysis me...
Optimization Model for Production Planning with Information Feedback
LIU Chen-yong, ZHOU Hong
2000, 26(4): 477-480.
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The concepts of feedback parameters and feedback constraints are brought forward.The optimization model for production planning with information feedback is proposed and compared with two traditional approaches,liner programming and heuristic method.The results show that the production planning obta...
Parameter Estimation Based on LMI with Bounded Data Uncertainties
YANG Zhi-hui, MAO Jian-qin, WEI Ke-hui
2000, 26(4): 481-484.
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A class of parameter estimation problem is put forth with bounded data uncertainties, and solved it based on linear matrix inequalities (LMI). The uncertainties are expressed by a priori bounds on perturbations of coefficient matrix and its elements, which covers some situations explored in [3] and ...
Structure Characteristics and Piezo-Resistance Effect in Hydrogenated Nanocrystalline Silicon Films
CHEN Chen, HE Yu-liang, QI Xiang-lin
2000, 26(4): 485-489.
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A study of electrical properties of P doped hydrogenated nanocrystalline silicon films (nc-Si:H) indicate that the room temperature dark conductivity σ is in the range of 10-1-101S·cm-1,two magnitudes higher than that of undoped nc-Si:H films. We also found the relationship between doping concentrat...
Study on Reliability Simulation Testing System for Embedded Software
LIU Bin, GAO Xiao-peng, LU Min-yan, RUAN Lian
2000, 26(4): 490-493.
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The reliability simulation test method and the test environment for embedded software is researched. The architecture of the reliability simulation testing system for embedded software is given. Based on the architecture,the paper analyzes the characteristics of the reliability simulation test metho...
Study of Shock Response Spectrum Control
YUAN Hong-jie, LI Chuan-ri
2000, 26(4): 494-496.
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At present, The technique of the control of the shock response spectrum is popular on shock test.The method of sums of exponentially decaying sinusoid components to match acceleration shock response spectrum is described by this paper. The acceleration,velocity,and displacement characteristics of th...

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