移动集群计算关键技术研究

随着集群和移动计算技术的快速发展及广泛应用,一种结合了这两种技术的新的计算方式——移动集群计算应运而生。分析讨论了移动集群计算的体系结构和实现移动集群计算的一些关键问题及解决方案。     

基于并行容错网的对等服务器集群的设计与实现

为了提高服务器系统的可靠性、可用性和性能,并改变目前非对称式服务器集群资源利用率低的状况,我们提出了一种新的服务器集群实现方案一基于并行容错网的对等服务器集群。在服务器集群的实现中,我们采用了软件集群的方法,设计实现了服务器集群管理层和并行容错通信层。     

利用集群技术构建Web-GIS平台的研究

集群系统和负载均衡技术提供了一种有效的扩展服务带宽和增加网络吞吐量的方法。在介绍集群系统结构和负载均衡技术的原理、算法以及实现方式的基础上,重点提出一种利用LVS和CFS技术应用于Web-GIS的服务器集群的设计方案,并优化了调度算法。     

基于J2EE平台集群服务的分布式缓存队列模型

集群缓存足提高J2FE(Java 2 Entcrprisc Edition)应用程序可扩展性能的关键技术,但目前J2EE提供的集群技术对于集群缓存的性能处理还存在一定的不足,该文在分析、12EE集群缓存技术的应用基础上,提出一种分布式缓存队列模型,可以有效地解决集群中的可靠性、可扩展性和失败转发等问题。实验表明,采用分布式缓存队列模型能提高集群的访问效率,是一种可行的解决方案。     

一种异构的Linux集群解决方案

简要介绍了集群的技术及其在Linux上的发展现状,分析了桌子新的集群实现技术,并且指出实用的集群系统的不足,提出一种强化了可管理性和数据一致性的异构Linux集群解决方案,以邮件集群系统为例进一步阐明异构集群系统的特性。     

一种新的Web集群请求调度模式与体系结构

分析了网络及Web应用的发展对Web集群请求调度提出的新要求,在此基础上提出了一种基于文档组织分布的新请求调度模式.针对该请求调度模式的特点,提出了一种分布调度、分布路由的Web集群体系结构,该结构结合了多分配器集群和分布式集群的优点,能保证系统的可扩展性,并能有效减少集群内的通信开销和消除单点故障.     

具有区分服务等级的可扩展并行服务器集群

采用并行Web服务器集群技术实现高性能的WEB服务器服务已经成为一种趋势,该技术具有性能高,可扩展性好,可靠性高、成本低等特点。文章介绍了目前Web服务器集群的结构和几种关键技术,在此基础上设计一种具有区分服务等级的Web服务器集群,并给出结构描述和资源管理的策略。     

基于状态转移图的虚拟集群节点可用性分析

针对虚拟集群节点的可用性评价,提出了一种基于状态转移图的虚拟集群节点可用性模型。首先,通过分析虚拟集群节点的部署方式和运行过程,确立了虚拟集群节点的5种生命周期状态,并阐明了5种生命周期状态之间的转移关系;然后,对于无备用节点和有备用节点两种情况下的虚拟集群节点,分别给出了相应的状态转移图,并建立了一系列的可用性模型。根据实际虚拟集群系统的运行日志,设定所提出的虚拟集群节点可用性模型的参数值,然后进行了多次数值模拟实验。实验结果表明,所提出的虚拟集群节点可用性模型的分析结果与实际可用性水平一致,能够正确地反映虚拟集群节点的可用性规律。     

集群分析

目前,基于集群分析的分类和分割已被认为是一种实用上颇具吸引力的方法。本文讨论的主要内容将涉及:集群的概念和描述方法;相似性和不相似的度量;主要的几种集群方法:统计的、谱(分层)和最小张树的、句法的诸集群方法;并着重于通过实例来说明在采用K—L变换完成特征选择或数据压缩后,集群算法的实现过程。     

一种高性价比的网络容灾与高可用集群的设计

讨论了网络容灾技术和高可用集群技术的概念、原理及研究现状，设计了一种网络容灾与高可用集群系统，并探讨了系统实现的若干关键技术。目的是探索一种利用集群技术和容灾技术，构建一个高性价比的、同时具有高可用性和灾难恢复能力的集群系统的方法。结果表明，系统结构简单、合理，运行稳定，具有较高的应用和推广价值。     

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.     

The architecture of TrueViz: a groundTRUth/metadata editing and VIsualiZing ToolKit

Tools for visualizing and creating groundtruth and metadata are crucial for document image analysis research. In this paper we describe TrueViz (TRUEVIZ User's Manual, August 2000; Proceedings of the SPIE Conference on Document Recognition and Retrieval, San Jose, CA, 2001, pp. 1-12), which is a tool for visualizing and editing groundtruth/metadata. We first describe the groundtruthing task and the requirements for any interactive groundtruthing tool. Next we describe the system design of TrueViz and discuss how a user can use it to create groundtruth. TrueViz is implemented in the Java programming language and works on various platforms including Windows and Unix. TrueViz reads and stores groundtruth/metadata in XML format, and reads a corresponding image stored in TIFF image file format. Multilingual text editing, display, and search modules based on the Unicode representation for text are also provided. This software is being made available free of charge to researchers.     

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.     

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。     

Stay the course: Why trump must build on obama’s cybersecurity policy

The article presents a review and analysis of cybersecurity policy and strategic initiatives by the Obama Administration, and an argument for continuity and improvement of initiatives already in motion through the Trump Administration that will allow for growth of critical cybersecurity strategies that will improve critical infrastructure protection, modernize and defend the U.S. federal IT enterprise, and secure U.S. and allied investments in cyberspace. A discussion on key strategic efforts of the Obama Administration from 2008 to 2016 is presented, as well as challenges and potential improvements that could be made in the Trump Administration. We conclude by making several recommendations for U.S. policymakers that would provide continuity and iterative improvement to President Obama’s cybersecurity policy strategy: deepen the federal cybersecurity bench, accept recent bipartisan recommendations for policy improvement and strategic direction, and continue U.S. leadership in public-private and international partnerships.     

Towards an Interoperable Metamodel Suite: Size Assessment as One Input

In recent years, many metamodels have been introduced in the software engineering literature and standards. These metamodels vary in their focus across, for example, process, product, organizational and measurement aspects of software development and have typically been developed independently of each other with shared concepts being only accidental. There is thus an increasing concern in the standards communities that possible conflicts of structure and semantics between these various metamodels will hinder their widespread adoption. The complexity of these metamodels has also increased significantly and is another barrier in their appreciation. This complexity is compounded when more than one metamodel is used in the lifecycle of a software project. Therefore there is a need to have interoperable metamodels. As a first step towards engendering interoperability and/or possible mergers between metamodels, we examine the size and complexity of various meta-models. To do this, we have used the Rossi and Brinkkemper metrics-based approach to evaluate the size and complexity of several standard metamodels including UML 2.3, BPMN 2.0, ODM, SMM and OSM. The size and complexity of these metamodels is also compared with the previous version of UML, BPMN and Activity diagrams. The comparatively large sizes of BPMN 2.0 and UML 2.3 suggest that future integration with these metamodels might be more di±cult than with the other metamodels under study (especially ODM, SSM and OSM).     

Integration | Innovation | Inclusion: Values,Variables and the Design of Human Environments

Complexity, complication, contradiction, consumption, confusion, delusion, depression. Opportunity, inspiration, ingenuity, compassion, wisdom. Our world is perplexing, our times are fast moving, and our choices are many. To find an appropriate path is a daunting yet vital challenge that confronts us as individuals, as communities, and as a civilization. How sustainable is our world? How reasonable are our behaviors? The present article is a collection of thoughts on a series of intertwined issues related to the contemporary world, its environmental dimensions, and their present-day problems. The goal is to survey the landscape through a lens of Environmental Design, to provide some perspectives, to raise some questions, and to explore systems, beliefs, and values informing and influencing actions. It is important to consider how people's belief systems influence, inform, and shape actions. This holds true in realms political, spiritual, and cultural. It also proves relevant in the ways in which we imagine, design, develop, and construct our buildings, cities, spaces, and places.

Appropriate solutions to some of our most daunting problems will arise through the concerted efforts, open dialogue, and collective wisdom of the wide array of stakeholders, professionals, politicians, decision makers, and citizens (both engaged and disenfranchised) who have the will and wherewithal to make a difference and to make the world safer, healthier, and better. It seems vital for us to critically examine, and question, our belief systems and their connections to the ways we define, refine, and realize progress. Architecture and Environmental Design, in both a philosophical and a practical sense, reflect as well as form greater aspirations, directions, and events of our times.     

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。     

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.     

基于Android智能手机的实验管理系统

移动互联时代已经全面向人们走来,渗透到高校学习、生活的每一个角落。针对高校中基于B/S模式的实验室管理系统已不能满足移动性和便携性的需求,通过Android技术在Eclipse平台上编写用户界面,以GET和POST方式与Tomcat轻量级服务器进行交互,服务器采用Servlet模块完成登录验证和指令响应,选取JDBC方式与后台MySQL数据库进行数据存储和处理交互,实现Android智能手机上的实验管理系统,使学生和教师能够便捷快速地完成实验预约、获取课程变更通知,此外重点实现实验室实景模块使教师可在手机端随时随地查看实验室情景,实验指导书模块便于学生预习实验或在实验过程中查看,提高实验管理工作的便携性和时效性。