Common coupling and pointer variables,with application to a Linux case study

Both common coupling and pointer variables can exert a deleterious effect on the quality of software. The situation is exacerbated when global variables are assigned to pointer variables, that is, when an alias to a global variable is created. When this occurs, the number of global variables increases, and it becomes considerably harder to compute quality metrics correctly. However, unless aliasing is taken into account, variables may incorrectly appear to be unreferenced (neither defined nor used), or to be used without being defined. These ideas are illustrated by means of a case study of common coupling in the Linux kernel.

异构数据源的集成技术

本综述了异构数据源集成技术的发展必然性、发展历史、现状和将来。按照集成技术出现时间的顺序首先介绍了最通用的ODBC方案,然后介绍了两种对关系数据库进行集成的传统方法：有全局模式的集成策略和无全局模式的集成策略,最后着重叙述了新时期出现的几种有代表性的数据集成方法。     

用通信中间件实现B2B与ERP的系统集成

ERP系统是B2B系统的基础,企业电子商务常常建立在已有的企业内部网上,为保证电子商务有效工作,二者之间必须实现无缝集成。这就要求企业电子商务网站的数据库服务器与企业内部网的数据库服务器之间进行双向的数据通信,通信中间件产品提供了实现这种数据通讯的有效手段,本文介绍了IBM的通信中间件产品MQSeries,并用实例说明了利用它实现系统集成的方法。     

Comparison between on- and off-campus behaviour and adaptability in online learning: a case from China

More and more universities and colleges are providing online courses not only for on-campus students but also for off-campus students. Tutors have to consider the differences between on- and off-campus students in order to improve effective instruction. Comparisons are made in this paper between on- and off-campus performances in online learning from four areas: learning time, path of browsing courseware, intercommunication and adaptability towards online learning. The last two areas are emphasized. Multiple approaches were adopted to collect data, which include questionnaires, posted documents, online logs, interviews and observations. This study shows that the rush time of online learning, paths of browsing courseware and favourite intercommunication means of on- and off-campus students are similar. But there are also some differences between these two groups such as competence of self-learning, enthusiasm of interpersonal exchange, dependence on tutors, feeling of learning stress, etc.     

Discrete J-spectral factorization

This paper deals with the J-spectral factorization for general discrete rational matrices. A simple approach based on the Kalman filtering in Krein space is proposed. The main idea is to construct a stochastic state space filtering model in Krein space such that the spectral matrix of the output is equal to the rational matrix to be factorized. The spectral factor is then easily derived by using the generalized Kalman filtering in Krein space, which is similar to the H₂ spectral factorization. Our approach unifies the treatment of the H₂ spectral factorization and the J-spectral factorization. The applications of the derived results in H_∞ and risk-sensitive estimation for both nonsingular and singular systems are demonstrated.     

线性时滞系统依赖于时滞的H~∞状态反馈控制

对具有纯滞后输入的线性时滞系统 ,在系统的状态时滞与控制输入时滞不同时 ,研究了依赖时滞的 H∞ 状态反馈控制器设计问题 ,其控制器存在的充分条件由一个线性矩阵不等式 (L MI)的形式给出 ,并给出了相应的 H∞ 控制器的综合设计方法     

基于自组织神经网络的烧结终点自适应预报系统的开发

烧结终点的在线检测和提前预报对于稳定终点,进而提高烧结矿强度和产量、降低能耗有重要意义。文章介绍了烧结终点的软测量方法;提出了一个新的预报参数——风箱废气温度曲线拐点;将多层前向人工神经网络应用于烧结终点的预报,对BP算法做了较大改进,使学习算法可以自组织神经网络的结构。应用这些技术开发的烧结终点自适应预报系统能够快速、准确地判断和预报烧结终点的状态,可用于在线操作指导或作为自动控制的依据。     

CPU桥ASIC设计中CPU模拟器的设计

功能模拟是设计高性能微处理器接口ＡＳＩＣ芯片的重要环节,目的是消除ＡＳＩＣ的功能性设计错误。为了更好地对ＡＳＩＣ芯片进行模拟,需要灵活、方便、能够体现微处理器行为的ＣＰＵ模型,文章将介绍了对一个ＣＰＵ行为模拟器的开发。     

数字图书馆技术及信息查询系统的设计

文章介绍了数字图书馆的特点及建立数字图书馆所需关键技术,提出了一种基于Web环境下的数字图书馆的信息查询系统的设计方案,详细论述了查询系统的设计思想、功能,所采用技术和实现方法,并从硬件和软件两个方面介绍了查询系统的实现方法。     

分布式实时应用的两个重要问题

可预测性分布式实时ＩＰＣ是分布式实时应用的两个重要问题,本文探讨了可预测性的概念,提出了分布式实时ＩＰＣ的抽象模型,并分析影响分布式实时ＩＰＣ的主要因素,为设计分布式实时应用作一定的探讨。