动态系统的自适应模糊神经网络控制

　Aim　To build an adaptive fuzzy neural controller and simulate it. Methods Fuzzy logic and back propagation(BP) algorithm are combined to utilize their advantages while avoiding the disadvantages. Results and Conclusion Simulation results of the third-order plant with disturbances and dead times show the validity of the presented controller. The presented controller can control cases that preceding controllers were unable to control.     

不同衬底上低温生长GaN形貌的AFM观察

　Aim　To study the relationship between the substrate temperature and the morphology and properties of GaN. Methods Applying the hydride chemical vapor deposition method, GaN films were deposited on different kinds of substrates, including sapphire, Si(111),Si(100),GaAs and GaP(111) both on the P face and the Ga face. The growth was performed at low temperatures of below 700℃. XRD, Hall measurement, cathodoluminescence (CL) and atomic force microscopy (AFM) were used to characterise the film properties. Results It was found that the temperature and the nature of substrate materials influence the layer morphology. Conclusion The analysis shows that no apparent relationship exists between the optical properties and layer morphology.     

风险分析的尖点突变模型

　Aim　To assess simultaneously various risk states of a system. Methods Using the catastrophe and fuzzy theory, the energy and uncertainty in a system are set as two control variables and the function of the system is used as the state variable for analysis. Results and Conclusion A risk analysis model named the cusp model is presented. Various states regarding the safety of the system such as the accident state, no-accident state and miss state can be represented at will on the cusp model.     

矿井通风网络分析的遗传算法

　Aim　To determine the global optimal solution for a mine ventilation network under given network topology and airway characteristics. Methods The genetic algorithm was used to find the global optimal solution of the network. Results A modified genetic algorithm is presented with its characteristics and principle. Instead of working on the conventional bit by bit operation, both the crossover and mutation operators are handled in real values by the proposed algorithms. To prevent the system from turning into a premature problem, the elitists from two groups of possible solutions are selected to reproduce the new populations. Conclusion The simulation results show that the method outperforms the conventional nonlinear programming approach whether from the viewpoint of the number of iterations required to find the optimum solutions or from the final solutions obtained.     

用于车辆传动的金属材料的疲劳试验及统计方法

　Aim　To improve the efficiency of fatigue material tests and relevant statistical treatment of test data. Methods Least square approach and other special treatments were used. Results and Conclusion The concepts of each phase in fatigue tests and statistical treatment are clarified. The method proposed leads to three important properties. Reduced number of specimens brings to the advantage of lowering test expenditures. The whole test procedure has more flexibility for there is no need to conduct many tests at the same stress level as in traditional cases.     

约束系统特性对乘员碰撞响应影响的仿真研究

　Aim　To study the influence of restraint system performance upon the occupant's response during impact, and provide a scientific base for occupant restraint system design. Methods In the light of basic theory of multibody system dynamics and impact dynamics on the basis of classical theory of impact, R-W method is adopted to construct the vehicle-occupant system model consisting of fourteen rigid bodies, thirty seven DOFs and slip joints for the simulation. A software named SVC3D(3-dimensional simulation of vehicle crash) is developed in the FORTRAN language. Results The results of simulation have a good coincidence with those of tests and the restraint system with low elongation webbing and equipped with pretensioner provides better restraint effect for the occupant. Conclusion The model of vehicle-occupant multibody system and SVC3D are suitable for use. Occupant should be belted with low elongation webbing to a certain degree and occupant restraint system should be equipped with pretensioner.     

极性反转瞬态电场的数值算法及应用

　Aim　To analyze the transient speciality of nonlinear, anisotropic, AC+DC coupling electric field, and to compare the withstand-voltage strength of different insulation structures. Methods The transient process of polarity reversal is analyzed, considering the anisotropic property of oil-immersed press-board, a new finite element model based on Galerkin method is presented and verified. The model developed is applied to calculate the electric field distribution in four typical winding end structures of the converter transformer. Results The whole-ring structure possesses the best insulation characteristics. Conclusion By introducing reasonable insulation components, insulation strength with the same surrounding sizes can be improved more than 30%.     

燃料空气炸药近区抛散过程的研究

　Aim　To study fuel dispersion in fuel air explosive(FAE) and computational ways of fuel dispersion velocity in the near area. Methods The dispersion process of fuel in FAE was analyzed by the use of results measured with KODAK EKTAPRO EM Motion Analyzer and setting up mechanical models. Results Computational methods for fuel dispersion velocity in the acceleration stage is given and taken as a base for the study of fuel dispersion in the intermediate and the far area. Conclusion When the fuel flow velocity is higher than that of the explosion gas in the center cavity, the fuel divides with the explosion gas and its velocity of flow reaches a maximum. The acceleration stage ends at that time. The fuel dispersion velocity at this time is the initial conditions for numeral analyses of dispersion process in the intermediate and far areas.     

节理岩体弹塑性动态有限元分析

　Aim　To study the elastic-plastic dynamical constitutive relations about a jointed rock mass under explosion load and its computer simulation. Methods Stress history is taken into account and stresses will follow changes in time during a period of explosion load. According to the principle of static force balance, the corresponding nodal concentrated force is calculated and the nodal displacement is counted. The elastic-plastic dynamic finite element equations are thus obtained. Results A finite element method is given for a jointed rock mass under explosion load. Conclusion The problem of large plastic deformation for jointed rock mass on blasting was efficiently resolved through dynamic finite element analysis and the range of damages by blasting simulated, and this pushes forward the problem to engineering practice.     

热处理对共混物中尼龙6熔融行为的影响

　Aim　To investigate the multiple melting behavior of polyamide-6(PA-6) in polyamide-6/linear low density polyethylene blends crystallized from the crystal-amorphous state. Methods The effects of annealing temperature, annealing time, heating rate, and the step-wise annealing were measured by DSC. Results and Conclusion There exists a critical heating rate affecting the middle temperature melting peak. When annealed at the temperature close to the melting peak, the main melting peak of PA-6 shifted to a higher temperature. Within a short time, annealing time has much effect on neat PA-6 but little effect on PA-6 in the blends. Addition of PE results in a decreasing in the height of melting peak. These phenomenon show that the melting behavior of PA-6 was affected by PE, compatibilizer, as well as thermal treatment.     

Multiplier Free IDCT Engine at MPEG-1 Video Data Rate

0~chopInspiteofcurmntbarkintheareaofstillimage.compressionandvideocompression['-'j,theJPEGandMPEGs}'stemsstinlankasthetWOdominantstandardsinstillimageandvideoimagecompression.FOrwaulandInverseDiscreteCosineTlansform.formanintegralpartofanyJPEGandMPEGsystem"-3).UPtonow,manydifferentalgoritLhlnstOdothediscretecosinet~formhavebeenproposed['-12].WhentakenintotheaccountofJPEGaccuracycompliance...id.rti..L13],thefastDCTalgorithmbyFeig[']reqUiresthedrinimumnumberofallthlneticoperahonsam…     

静态时序分析在数字ASIC设计中的应用

主要介绍了静态时序分析在数字ASIC设计中的应用，描述了静态时序分析的基本原理和流程，并以I^2C总线设计为例，分析了对数字ASIC作静态时序分析中可能出现的问题，提出了消除虚假路径的实际方法．通过对全芯片进行静态时序分析，可以确认设计的准确性和可靠性，从而为设计流程中每一部分的工作取得sign—off提供可靠保证．     

The Real Time Mixing Module Design for HDTV Data of SMPTE 274M and PC Video Data

A real time mixing module for high definition television (HDTV) data of SMPTE 274M and PC video data is designed. The hardware implementation, algorithm and simulation of the mixing module are given. In order to improve the capability of data processing, an anti-fuse FPGA chip and a mechanism of pipelining and modularization are adopted. With 6 parallel LUTs and a fast algorithm, it can mix 4:2:2 component signals in luminance and chrominance space respectively in real time. According to the simulation, the module has the ability to mix the uncompressed HDTV data with PC video data in real time, which can not be fulfilled by current ASIC chips. Furthermore, it can be extended to multi-stage mixing with the thoughts implied by the design. The mixing module can be widely used in HDTV production systems.     

视频处理器软硬件协同设计

为了提高视频图像处理速度与硬件资源利用,针对一种基于精简指令集处理器与数字信号处理器（RISC/DSP）混合体系结构的媒体处理器：浙大数芯（MD32）,给出了一种软硬件协同设计策略.所给策略结合视频处理核心算法,研究分析MPEG视频编码标准的处理过程,进行了视频处理指令扩展设计,提高了数据的并行处理能力,利用了指令内并行执行特性.为有效实现扩展指令,处理器执行级采用了可扩展流水级技术.实验结果表明,指令扩展硬件成本仅占MD32的2.7%,逆离散余弦变换实现性能比MMX/SSE指令集实现的性能分别提高31%和23%,运动补偿性能比MMX指令集实现的性能提高了40%.     

一种专用集成电路功能测试仪的设计与实现

采用现场可编程门阵列（ＦＰＧＡ）技术设计与实现了一种低成本、高性能的专用集成电路（ＡＳＩＣ）功能测试仪——ＮＰＵＡＳＩＣ测试仪。测试管脚多达１２８路，每路独立可编程，具有多种测试模式，可测试静态和动态芯片，并具备初步的速度测试能力。该测试仪是在ＩＢＭＰＣ及其兼容机上开发的，操作系统为ＤＯＳ；测试环境成熟，提供了与Ｃ兼容的高级测试语言，并可与当前几种广泛使用的电子设计自动化（ＥＤＡ）工具接口。     

基于MMX的DCT算法分析与实现

本文分析了利用ＭＭＸ指令集实现ＪＰＥＧ中ＦＤＣＴ／ＩＤＣＴ算法,并对ＰｅｎｔｉｕｍⅡ系统上的程序优化处理进行了讨论。     

无人机飞行控制系统优化设计

在小型无人机飞行控制系统经典设计的基础上,结合实际工程需要,应用多目标参数最优化方法对飞行控制系统进行优化设计。实际工程应用表明,优化设计明显改善了小型无人机飞行品质,保证了系统任务的可靠执行。     

关于2-D温度场计算的有限元法分析

目的　分析有限元法实现 2 -D温度场计算的一般规则及程序编制技巧 .方法　根据理论分析及实例 ,计算验证上述规则及技巧的正确性及在程序设计中的可行性 .结果　单元、单元节点的编号以及单元网格的形状对 2 -D温度场计算结果的精确度有很大的影响 ;而程序设计的技巧直接关系到计算能否顺利进行 .结论　遵循 2 -D有限元分析的一般原则加上适当的编程技巧 ,可顺利并精确地完成 2 -D温度场的计算     

ASIC Design of Floating-Point FFT Processor

An application specific integrated circuit (ASIC) design of a 1024 points floating-point fast Fourier transform(FFT) processor is presented. It can satisfy the requirement of high accuracy FFT result in related fields. Several novel design techniques for floating-point adder and multiplier are introduced in detail to enhance the speed of the system. At the same time, the power consumption is decreased. The hardware area is effectively reduced as an improved butterfly processor is developed. There is a substantial increase in the performance of the design since a pipelined architecture is adopted, and very large scale integrated (VLSI) is easy to realize due to the regularity. A result of validation using field programmable gate array (FPGA) is shown at the end. When the system clock is set to 50 MHz, 204.8 μs is needed to complete the operation of FFT computation.