车门LIN网络通信程序设计

介绍了轿车车门LIN网络基本结构,LIN总线的主/从节点采用MC68HC908GZ60/MC68HC908QL4,阐明了基于ESCI/SLIC模块的LIN主/从节点软件设计流程,编写了主、从节点的LIN通信程序.实践证明,该程序运行正常、可靠,为车门控制系统顺利实现提供可靠的保障.     

PLC在电厂烟气脱硫控制系统中的应用

文章从设计及应用角度介绍了由PLC;上位机等组成的一套实用型脱硫控制方案.     

基于RocketIO的高速串行协议设计与实现

采用Xilinx公司Virtex-Ⅱ Pro系列FPGA内嵌得SERDES模块--RocketIO作为高速串行协议的物理层,利用其8B/10B的编解码和串化、解串功能,实现了两板间基于数据帧的简单高速串行传输,并在ISE环境中对整个协议进行了仿真,当系统频率为100MHz,串行速率在2Gbps时,在验证板上用chipscope抓取的数据表明能够实现两板间数据的高速无误串行传输.     

基于BU-65170的1553B终端设计

本文主要描述了1553B总线终端接口芯片BU-65170的内部寄存器和RAM资源,提出了BU-65170与16位单片机Intel80C196的硬件接口设计和软件接口设计的方案.实现了1553B终端RT与总线控制器BC之间高可靠的数据通信.     

FM-index压缩查询算法解析

FM-index 是目前信息检索领域中国际上比较领先的压缩查询方法。该算法是压缩技术和索引技术的结合,它的最大优势在于能够支持在不解开压缩文件的情况下对源文件进行查询。本文对 FM-Index 如何实现压缩,如何建立索引以及如何实现压缩状态下的查询和定位算法进行了详细的解析,并对该算法的核心部分用图示加以说明,为 FM-Index 算法的相关研究及在实际中能良好的应用和改进提供了参考。     

Source number estimation and separation algorithms of underdetermined blind separation

Recently, sparse component analysis （SCA） has become a hot spot in BSS research. Instead of independent component analysis （ICA）, SCA can be used to solve underdetermined mixture efficiently. Two-step approach （TSA） is one of the typical methods to solve SCA based BSS problems. It estimates the mixing matrix before the separation of the sources. K-means clustering is often used to estimate the mixing matrix. It relies on the prior knowledge of the source number strongly. However, the estimation of the source number is an obstacle. In this paper, a fuzzy clustering method is proposed to estimate the source number and mixing matrix simultaneously. After that, the sources are recovered by the shortest path method （SPM）. Simulations show the availability and robustness of the proposed method.     

Adaptive guidance law design based on characteristic model for reentry vehicles

In this paper an adaptive guidance law based on the characteristic model is designed to track a reference drag acceleration for reentry vehicles like the Shuttle. The characteristic modeling method of linear constant systems is extended for single-input and single-output （SlSO） linear time-varying systems so that the characteristic model can be established for reentry vehicles. A new nonlinear differential golden-section adaptive control law is presented. When the coefficients belong to a bounded closed convex set and their rate of change meets some constraints, the uniformly asymptotic stability of the nonlinear differential golden-section adaptive control system is proved. The tracking control law, the nonlinear differential golden-section control law, and the revised logical integral control law are integrated to design an adaptive guidance law based on the characteristic model. This guidance law overcomes the disadvantage of the feedback linearization method which needs the precise model. Simulation results show that the proposed method has better performance of tracking the reference drag acceleration than the feedback linearizaUon one.     

New approach to the automatic segmentation of coronary artery in X-ray angiograms

For the segmentation of X-ray angiograms （XRA）, the essential feature and the prior knowledge of angiographic image were analyzed, and a multi-feature based fuzzy recognition （MFFR） algorithm was proposed to infer the local vessel structure in this paper. Guided by the prior knowledge of artery vessel, a probability tracking operator （PTO） can rapidly track along the artery tree, and walk across the weak region or gaps because of disturbance or preprocessing to angiographic image. Another, the accurate measurement of the vascular axis-lines and diameters can be synchronously implemented in the tracking process. To correctly evaluate the proposed method, a simulated image of CAT and some clinical XRA images were used in the experimentations. The algorithms performed better than the conventional one： given one start-point, on average 92.7% of the visible segments or branches was automatically delineated; the correctness ratio of vessel structure inference reached to 90.0% on the average.     

A new similarity computing method based on concept similarity in Chinese text processing

The paper proposes a new text similarity computing method based on concept similarity in Chinese text processing. The new method converts text to words vector space model at first, and then splits words into a set of concepts. Through computing the inner products between concepts, it obtains the similarity between words. The new method computes the similarity of text based on the similarity of words at last. The contributions of the paper include： 1） propose a new computing formula between words; 2） propose a new text similarity computing method based on words similarity; 3） successfully use the method in the application of similarity computing of WEB news; and 4） prove the validity of the method through extensive experiments.     

基于MATLAB的模拟滤波器设计实现

传统的模拟滤波器的设计过程复杂,计算工作量大,滤波特性调整困难,影响了它的应用。该文介绍了一种利用MATLAB信号处理工具箱(Signal Processing Toolbox)快速有效的设计由软件组成的常规数字滤波器的设计方法。利用MATLAB设计滤波器,可以随时对比设计要求和滤波器特性调整参数,直观简便,极大的减轻了工作量,有利于滤波器设计的最优化。