一类提取模糊规则的新方法及其在干燥建模中的应用

基于系统的输入－输出数据,提出一种通过划分输入空间撮模糊规则的方法,并将该方法应用于建模非线性程度较高物干燥过程。建模过程中,首先利用训练样本将输入空间动态地划分为若干个子空间,然后针对第一个子空间了生一条模糊规则,再将所产生的模糊规则共成一个模糊规则库,模糊逻辑系统的最终输出从模糊规则库中产生。仿真结果表明,该方法可很好地预测干燥系统的物料降水率,而且简单实用,十分可靠。     

SNMPv1与SNMPv2、SNMPv3的比较研究

该文介绍了ＳＮＭＰ的基本概念,在此基础上具体比较了三个版本之间的差异,这样对ＳＮＭＰ协议的实现具有十分重要的意义。     

射影不变性在旋转对称形状描述中的一种应用

旋转对称性是计算机视觉形状分析中的一类重要结构属性。自动检测该类目标的旋转特性以及提取目标的旋转中心（轴）,是描述和分析旋转对称目标的关键步骤。旋转对称的形状经过透视成像后,其成像特点不再具有对称性甚至扭对称性,但对称的结构单元之间仍然存在内在的对应不变特性。该文以简单连通的平面多边形目标为研究模型,利用射影几何中的交比不变量定义了目标轮廓上关键点的结构参数和结构参数的相似性度量,用于自动检验目标上的旋转对称点对;并利用正多边形顶点与形心的关系约束形成射影不变性,用来自动检测目标的旋转中心。实验结果验证了方法的有效性。     

一种分布式网络指纹识别系统

文章介绍了一种分布式网络指纹识别系统NBFIS(Network-BasedFingerprintIdentifyingSystem)。首先提出模型框架,并对其关键技术特别是指纹图像处理技术及面向对象的数据库技术进行讨论。实现了NBFIS系统的原型并给出实验和性能测试结果。     

单片机多红红外通信系统的设计与实现

本文提出了一种利用软件方法实现单片机多机红外通信的设计方案。该方案减少了通信系统的硬件复杂性,降低了成本,提高了通信的灵活性。文中介绍介绍了方案的设计思想,包括硬件设计原理、信息格式的设计与差错控制的实现、信息答应机制以及软件核心框架等,同时指明了设计的应用前景。实践证明,效果比较理想。     

近似弧长参数化的三次保形插值

在构造近似弧长参数化曲线时,必须添加某些额外的数据点,以获得足够的近似弧长参数化精度,对于参数三次曲线,给出了一个“双点单位化”的近似弧长参数化公式,为如何选择这些额外数据点提供了理论依据,所给出的方法既能有效地提高近似弧长参数化精度,同时又满足了保形插值的要求。     

A novel continuous-time neural network for realizing associativememory

A novel neural network is proposed in this paper for realizing associative memory. The main advantage of the neural network is that each prototype pattern is stored if and only if as an asymptotically stable equilibrium point. Furthermore, the basin of attraction of each desired memory pattern is distributed reasonably (in the Hamming distance sense), and an equilibrium point that is not asymptotically stable is really the state that cannot be recognized. The proposed network also has a high storage as well as the capability of learning and forgetting, and all its components can be implemented. The network considered is a very simple linear system with a projection on a closed convex set spanned by the prototype patterns. The advanced performance of the proposed network is demonstrated by means of simulation of a numerical example.     

Heat transfer in microchannel devices using DSMC

The heat transfer characteristics of supersonic flows in microchannels is studied using direct simulation Monte Carlo (DSMC) method. The velocity components and the spatial coordinates of the simulated particles are calculated and recorded by using a variable-hard-sphere (VHS) collision model. The effects of Knudsen number (Kn) on the heat transfer of the microchannel flows are examined. The results show that the magnitude of the temperature jump at the wall increases with increasing Kn. The heat transfer to the isothermal wall is found to increase significantly with Kn. The possible causes for the increase of wall heat transfer are discussed     

A performance criterion for the depth estimation with application to robot visual servo control

This article deals with the depth observability problem of a robot visual system with a moving camera. In the visual system, the unknown depth of a feature point is estimated from the input of the camera velocity and the output of the image of the feature point. Although it is well known that the linear velocity of the camera must satisfy some constraints for successful depth estimation, this proposes a criterion to measure the performance of the depth estimation, which is a heuristic extension from an estimation result of a linear system. This performance criterion depends on both the image position and the linear velocity of the camera. Some simulation and experiment examples demonstrate and verify the proposed performance criterion. Furthermore, this criterion is used to develop a new visual servo control scheme that has good performance in both the depth estimation and the visual control. This control scheme is also verified by a simulation example. © 2001 John Wiley & Sons, Inc.     

用二次插值实现近似弧长参数化

分段二次Ｈｅｒｍｉｔｅ插值用来保单调地反插值参数曲线的弧长函数．所作近似弧长参数化曲线在插值节点处,近似弧长是精确的,并且具有与精确弧长参数曲线同方向的单位切矢．在整个近似弧长参数区间,近似弧长的误差可达到０（△ｔ）＾２（△ｔ为节点步长）．数值实例得到了很好的结果．