XML文档在关系数据库中的规范化存储

提出了一种存储方法，首先把XML文档映射为泛关系模式，再利用算法DeriveFDs推导出XML键所蕴含的泛关系模式上函数依赖集的规范覆盖，根据此规范覆盖，最后将泛关系模式保持函数依赖地分解为3NF模式集。得到了保持XML键约束的规范化存储模式，实现了XML文档在关系数据库中的规范化存储。实验研究表明文中提出的方法是有效的。     

XML函数依赖研究

为了消除数据冗余,基于关系数据模型的函数依赖理论已经被广泛接受并应用于关系数据库的设计中。XML数据库中同样存在数据冗余。为了设计没有冗余的XML数据库,需要用一种简洁、易于理解的方法来定义XML数据问依赖关系。在无序的结点标记树数据模型上定义了XML子树间的函数依赖,并且给出了一套公理系统用来推导函数依赖,以解决函数依赖的蕴涵问题,最后证明了该公理系统是合理的。     

XML文档规范化算法研究

函数依赖对关系数据库和XML文档都是一种重要的语义表达。文中对XML文档中存在的函数依赖、部分函数依赖和传递函数依赖进行分析,对规范部分函数依赖提出XML第二范式,对规范部分函数依赖和传递函数依赖提出了XML第三范式,给出了相应算法,并进行了无损联接性和函数依赖保持性证明,对可终止性和时间复杂度进行了分析。     

XML的规范化与范式

给出了XML间接函数依赖和传递函数依赖的概念,据此提出了以DTD为模式的XML文档的一种范式XMLNF,它可以消除XML文档中由于间接函数依赖和传递函数依赖所引起的数据冗余,给出了把DTD无损联接地分解成XMLNF的规范化方法.     

用一个实例讲解关系数据理论中的规范化问题

规范化问题是关系数据理论的重点和难点，仅从理论上作出解释，很难使学生理解，本文提出通过一个完整的实例，采用逐步深入的方法解决关系模式中存在的问题，使学生加深对规范化理论的理解。     

存在多值依赖的XML DTD规范化研究

XML DTD文档中可能包含由非函数依赖引起的数据冗余和操作异常，首先从消除DTD文档内数据冗余的角度出发研究了文档的规范化的问题，讨论了在DTD文档中存在多值依赖的情况下，如何规范XML文档，提出了以DTD为模式的XML文档的多值依赖的概念。然后基于多值依赖的概念，提出了XML文档的一种多值依赖范式MXNF。最后在此基础上提出了把一个XML文档的DTD无损联接地分解成为符合MXNF的规范化算法，来规范存在多值依赖的XML DTD文档，并给出了该算法的分析说明。     

基于路径表达式的XML第四范式及无冗余性判定

随着XML应用越来越广泛,为避免冗余,XML模式设计也变成了越来越受关注的问题,因此XML规范化理论是一个重要的研究领域.类似于关系数据库,本文从数据库角度出发,以消除数据冗余为目的,研究DTD中以路径表达式为基础的基本定义;因函数依赖和多值依赖是数据语义的重要组成部分,将其引入到XML领域中,形式化定义了XML的函数依赖和多值依赖;基于XML树、函数依赖和多值依赖概念,给出了键、冗余的描述,进而在XML函数依赖和多值依赖并存情况下,提出了满足XML第四范式的条件;给出了满足XML第四范式条件的XML文档树无冗余的判定定理,并通过具体实例及实验证明了XML第四范式的有效性.     

基于XML数据集成与交换中的完整性约束研究

介绍了CoXML系统中提出的3种新的XML完整性约束技术:基于XML的数据交换中的函数依赖转换方法,面向XML Schema的键约束转换方法和基于XPath的XML文档键约束验证方法,并且通过CoXML系统的实现验证了这些技术的有效性.     

XML数据库模式中的数据依赖和结构冗余

现代社会,是经济迅速发展的社会,而随着经济基础的迅速发展,信息技术也快速的发展和广泛的应用,计算机技术正向着微型化和专业还的趋势发展着。而数据库技术的利用也是计算机应用技术中比较常用的一种,数据库技术中比较常用的有XML、SQL等等。该文基于XML数据库模式中数据依赖和机构冗余方面做了简单阐述。     

基于XML数字签名的应用模型设计与分析

介绍了利用XML数字签名设计带有安全要求的应用系统的方法。分析了推荐的XML签名和验证模型在对XML消息进行签名和验证时存在的不足。给出了SOAP数字签名流验证的CXML/SSoap_SV系统的设计和实现思想。根据实验结果分析得出结论，流验证模型提高了应用系统的性能和系统的存储效率。     

图书自助借还终端系统的应用研究

传统的图书借还流程需要在人为辅助下进行且图书馆每天开放时间较短,在生活节奏快以及职业、生活多元化发展的今天,难以满足现代人的需求。为了提高图书借还效率,有效管理图书馆图书借还产生的数据,减少人力物力资源的损耗,本文研究设计了一个运用WIFI技术、RFID技术和WEB技术的自助图书借还终端系统。系统主要由自助借还书终端机、WEB服务器和数据库服务器三部分组成。读者可利用带有RFID标签书籍和RFID借书卡,在图书自助借还终端自助地完成借书和还书。终端机同时将读者借书还书信息发送至WEB服务器,信息经WEB服务器处理后,上传至数据库服务器中。系统可代替人工借还书服务,在提高图书借还效率的同时保证图书馆服务质量,可实现图书馆无人管理以及长时间开放。     

自动化立体仓库控制系统设计

为满足大载重、高速、高精度立体仓库控制系统的自动化运行要求,设计了一种PLC控制器和伺服控制相结合的控制系统方案。系统采用了三菱以太网、H网、CC-Link和串口通信等不同层次、不同通信协议的通信网络来满足现场复杂环境的通信需求,并采用三菱伺服的半闭环、全闭环等多种控制方式来满足生产对系统的运行速度、精度和平稳性的需求。实际运行效果表明,该控制方案较好地适应了现场生产环境,实现了系统安全、稳定的运行,满足了各项生产需要,大大节约了人力和物力。     

OSI环境中的MMS

本文主要论述了在ＯＳＩ环境中制造信息规范ＭＭＳ操作，ＭＭＳ与ＯＳＩ环境的关系以及制造环境中与ＯＳＩ相关的术语，且在此基础上再简单介绍在该思想指导下实现ｍｉｎｉ－ＭＡＰ过程中所得的点滴体会。     

基于VC++和JAVA的多线程程序设计与实现

讨论了多线程的基本概念及应用场合,总结了以面向对象主流语言VC 和JAVA为工具的多线程程序设计实现方法。比较了两种语言在创建和调度线程的差异,并分析了全局变量、自定义消息、等待/通知三种多线程间的通信机制。介绍了在VC 中用信号量、互斥体、事件和临界区四种对象实现和在JAVA中用Synchronized关键字实现的同步技术。最后,对改进多线程应用的性能和安全提出了一些策略。结论是多线程有利有弊,要合理使用。两种语言各有所长,根据应用而选。     

A hierarchical organization scheme for video data

Video stream is based on bits of imagery and is thus difficult to be perceived (by machine) in the content level. To access video content, a suitable organization of video data is critical. This paper proposes a hierarchical structure and a process scheme for organizing video data to facilitate indexing, browsing and querying. Four layers can be distinguished, that is: video program, episode, shot and frame. This hierarchy provides an efficient and flexible structure as well as compact and meaningful abstraction of video program. To achieve such an organization, not only the boundary detection of shots and episodes, but also the extraction of key-frames for shots and the selection of representative shots and frames for episodes are important. Suitable criteria and methods for above tasks are proposed and these techniques have been integrated into a workable system. A number of organization experiments using real video data are performed and some results are presented, which show the effectiveness of the proposed organization scheme and techniques.     

Flexible media: producing character-based reconfigurable drama

From Spring 2002 to Summer 2003 the Flexible media project and prototype experiment ran at Cambridge University Moving Image Studio (CUMIS) and BTexact Technologies, Adastral Park UK. This pilot project aimed to explore and formulate new storyforms using reconfigurable digital media, and to develop new methods and best practice for producing and publishing them, focusing on digital video, both documentary and fiction. Original material was produced in student workshops at CUMIS (MPhil) and the Norwegian Film School, where the Flexible media toolkit was tested and developed to incorporate the needs of creative content production. This paper describes the project and experiment in some detail, identifying the restrictions within traditional media production processes, and the opportunities offered by a more flexible approach. It then presents a case study of the experimentation undertaken to develop new flexible media forms. The paper concludes that collaborative practice-based research is successfully providing creative professionals with new modes of expression and engagement with their audience.     

因素空间与可拓学的互补性分析及问题处理融合模型

问题智能处理是人工智能领域具有挑战性和交叉性的课题。大数据与人工智能技术背景下,为了给具有较高普遍性的开放性问题求解提供新的理论支撑,对因素空间与可拓学做了对比分析,发现两者具有共同的数学基础,在问题智能处理等研究方向有交叉性和互补性。以面向问题处理的融合模型为例,论证了可拓学与因素空间交叉研究的基本路径及其可行性,提出了两者交叉研究的主要方向,阐明了实际应用的潜在优势及适用范围。该研究将有助于进一步提高问题处理的系统性、智能化水平,提高解决问题从不确定性、偶然性到必然性的程度,并将推动为智能科学服务的智能数学的发展。     

Measurement of prehensile grasp capabilities by a force and moment wrench: Methodological development and assessment of manual workers

Prehensile grasp capability is typically quantified by pinch and grasp forces. This work was undertaken to develop a methodology to assess complex, multi-axis hand exertions through the measurement of forces and moments exerted by the hand along and about three orthogonal axes originating at the grip centre; termed an external wrench. Instrumentation consisting of a modified pinch/grip dynamometer affixed to a 6?df force cube was developed to simultaneously measure three forces, three moments and the pinch/grip force about the centre of the grip. Twenty right hand dominant manual workers (10 male and 10 female), free of hand or wrist disorders, completed a variety of maximal strength tasks. The randomized block design involved three separate grips?–?power grip, lateral pinch and pulp pinch. Randomized within each block were three non-concurrent repetitions of isolated maximal force and moment generations along and about the three principle orthogonal axes and a maximal grip force exertion. Trials were completed while standing, with the arm abducted and elbow flexed to 90° with a wrist posture near neutral. Where comparable protocols existed in the literature, forces and moments exerted were found to be of similar magnitude to those reported previously. Female and male grip strengths on a Jamar dynamometer were 302.6?N and 450.5?N, respectively. Moment exertions in a power grip (female and male) were 4.7 Nm and 8.1 Nm for pronator, 4.9 Nm and 8.0 Nm for supinator, 6.2 Nm and 10.3 Nm for radial deviator, 7.7 Nm and 13.0 Nm for ulnar deviator, 6.2 Nm and 8.2 Nm for extensor, and 7.1 Nm and 9.3 Nm for flexor moments. Correlations with and between maximal force and moment exertions were only moderate. This paper describes instrumentation that allows comprehensive characterization of prehensile force and moment capability.     

基于CPCI与LPC总线的主板BIT设计

为提高CPCI计算机设备的可靠性,准确地定位故障,减少设备的维修时间,在原计算机主板的基础上,提出了基于CPCI总线及LPC总线的故障检测卡。以故障检测和定位为目标,兼顾设备的扩展性和易用性,建立以CPLD为控制芯片,采用VHDL硬件描述语言,实现对计算机主板进行故障检测和定位的功能卡。详细介绍了BIT(built in test)卡的原理和软、硬件设计,并给出了仿真结果。仿真实验结果表明,整个设计安全可靠,移植性好,可为计算机的主板设计提供参考。     

Contending with Terms: “Multimodal” and “Multimedia” in the Academic and Public Spheres

Scholars have begun naming and defining terms that describe the multifaceted kinds of composing practices occurring in their classrooms and scholarship. This paper analyzes the terms “multimedia” and “multimodal,” examining how each term has been defined and presenting examples of documents, surveys, web sites and others to show when and how each term is used in both academic and non-academic/industry contexts. This paper shows that rather than the use of these terms being driven by any difference in their definitions, their use is more contingent upon the context and the audience to whom a particular discussion is being directed. While “multimedia” is used more frequently in public/industry contexts, “multimodal” is preferred in the field of composition and rhetoric. This preference for terms can be best explained by understanding the differences in how texts are valued and evaluated in these contexts. “Multimodal” is a term valued by instructors because of its emphasis on design and process, whereas “multimedia” is valued in the public sphere because of its emphasis on the production of a deliverable text. Ultimately, instructors need to continue using both terms in their teaching and scholarship because although “multimodal” is a term that is more theoretically accurate to describe the cognitive and socially situated choices students are making in their compositions, “multimedia” works as a gateway term for instructors and scholars to interface with those outside of academia in familiar and important ways.