具有状态时滞线性系统对时滞参数的自适应控制

对于存在状态时滞的线性时滞系统, 研究了无记忆与带记忆的复合状态反馈控制器的设计问题, 当滞后常数不能精确已知时, 首次提出了对时滞参数的自适应控制方案, 通过解相应的线性矩阵不等式 (LMI)即能求得满足设计要求的对时滞参数自适应控制器. 最后给出了仿真实例以说明结论的有效性.     

存储系统模拟器SiMemSy的设计与实现

由于存储器间距日益扩大 ,存储系统对计算机系统整体性能的影响越来越严重 ,存储系统模拟器的研究与开发也日益重要 .传统的模拟器更多地将注意力集中于对 Cache的模拟 ,而对存储系统整体的模拟不够 .为了模拟并分析存储系统各部分的性能与其对存储系统整体性能的影响 ,本文设计并实现存储系统模拟器 Si Mem Sy(SImulator ofMEMory SYstem) .实验表明 ,Si Mem Sy可以准确、高效地对存储系统进行模拟并得到可信的结果     

解决中央处理器运算速度与内存系统性能矛盾的一种方案

中央处理器-存储器集成是解决当前处理器运算速度与传统的存储器系统性能滞后的一种新思路。文章运用一个简单的评价模型和模拟运行,分析了几种处理器-存储器集成的方案。     

基于模糊神经网络结构的多值联想记忆

文章基于模糊神经网络结构,即通过模糊化,推理,去模糊三个过程,把Kosko提出的模糊联想记忆(FAM)网络模型应用到容错性需要较强的多值联想记忆中,解决了这种网络模型不能对随机噪声模式正确联想的问题,新的网络模型设计简单,大量实验表明文中的联想记忆网络大大提高了FAM网络的容错性能。     

汉语基本短语的自动识别

本文应用基于实例的MBL(Memory-Based Learning)学习方法,对汉语中较常见的9种基本短语的边界及类别进行识别,并利用短语内部构成结构和词汇信息对预测中出现的边界歧义和短语类型歧义进行了排歧处理。实验中还比较了在特征向量中加入词汇信息与否对实验结果的影响。实验取得了比较令人满意的结果:对这9种基本短语的识别正确率达到95.2%;召回率达到93.7%。     

Support Vector的几何解释及其在联想记忆中的应用

利用闭凸集上的投影解释support vector的几何意义，利用支持超平面讨论线性分类器的设计问题，对线性可分情形，Support vector由一类数据集合闭凸包在另一类数据集合闭凸包上投影的非零系数向量组成，SVM所决定的超平面位于两投影点关于各自数据集合支持超平面的中间，作为应用，文中给出一种设计理想联想记忆前馈神经网络的方法，它是FP算法的一般化。     

B+树阶数m的最优选取

本文指出对普通的B^ 树作了一定的限制后，当选择B^ 树适当的阶数m时，对B^ 树索引文件的时间和空间利用率有一个最优的设计过程，分别给出了应用在两种数据库系统模型中的B^ 树索引文件结构：（1）具有有限内存的数据库系统（Database Systems with Limited Amount of Main Memory,简称为DBSLAM），在DBSLAM模型中，我们只是缓存B^ 树中的部分结点；（2）具有极大内存的数据库系统（Database Systems with Very Large Amount of Main Memory，简称为DBSVLAM）,在DBSVLAM模型中，我们将缓存B^ 树中所有的结点，基于以上两种模型，我们分别建立了两个不同的时空开销模型，并以此进行了优化设计。     

Precise Data Locality Optimization of Nested Loops

A significant source for enhancing application performance and for reducing power consumption in embedded processor applications is to improve the usage of the memory hierarchy. In this paper, a temporal and spatial locality optimization framework of nested loops is proposed, driven by parameterized cost functions. The considered loops can be imperfectly nested. New data layouts are propagated through the connected references and through the loop nests as constraints for optimizing the next connected reference in the same nest or in the other ones. Unlike many existing methods, special attention is paid to TLB (Translation Lookaside Buffer) effectiveness since TLB misses can take from tens to hundreds of processor cycles. Our approach only considers active data, that is, array elements that are actually accessed by a loop, in order to prevent useless memory loads and take advantage of storage compression and temporal locality. Moreover, the same data transformation is not necessarily applied to a whole array. Depending on the referenced data subsets, the transformation can result in different data layouts for a same array. This can significantly improve the performance since a priori incompatible references can be simultaneously optimized. Finally, the process does not only consider the innermost loop level but all levels. Hence, large strides when control returns to the enclosing loop are avoided in several cases, and better optimization is provided in the case of a small index range of the innermost loop.     

An object‐oriented interface for the dynamic memory management of sparse discrete mathematical operators in numerical scientific applications

This paper describes an object‐oriented interface for the memory management of sparse discrete mathematical operators in numerical scientific applications. The basic data structure we propose is intended to implement and cope with mathematical vectors in sparse format. This structure allows an effective implementation of more complex data structures, such as matrix and matrix‐like objects, to represent the discrete version of differential operators in numerical application codes. A research example concerning adaptive wavelet algorithms illustrates the possible applications.Copyright © 2002 John Wiley & Sons, Ltd.     

Low‐power‐consumption TFT‐LCD with dynamic memory embedded in the pixels

A low‐power‐consumption thin‐film‐transistor liquid‐crystal display (TFT‐LCD) with dynamic memory cells embedded in each pixel using low‐temperature poly‐Si technology has been developed. By holding data in the memory, the operating rate of the data driver can be dramatically reduced to 4 Hz. Eight levels of gray scale with low power consumption can be achieved by using the area‐ratio gray‐scale method. This TFT‐LCD can be used for displaying fine still images, with low power consumption.