Identity management systems

Most organizations have difficulty keeping track of and controlling all the user identifiers and passwords across their systems. In particular, with people leaving the organization and constantly changing roles, it is more difficult to make sure every user has appropriate access to the systems. In our case at a university, we constantly have new students arriving and former students leaving. New students need access to our systems to register for classes and use e-mail, library resources, and the computing labs. Former students should no longer have access to systems we don't have permission to provide (such as some library resources) or don't have the capacity to continue to provide. At companies, similar problems exist with new and former employees, as well as the need to meet requirements from laws such as Sarbanes-Oxley regarding who is permitted access. Identity management (IdM) systems are designed to help manage user identifiers across multiple systems as well as providing a way to manage user access over their lifecycle of roles in the organization. They are tightly integrated with other systems such as those that provide a single sign-on mechanism and the checking of their credentials. As such, these IdM systems have become extremely common in information technology infrastructure.     

JGOMAS: New Approach to AI Teaching

This paper presents a new environment for teaching practical work in AI subjects. The main purpose of this environment is to make AI techniques more appealing to students and to facilitate the use of the toolkits which are currently widely used in research and development. This new environment has a toolkit for developing and executing agents, called JADE-based game-oriented multiagent system (JGOMAS). The environment also has a dedicated website where students can access different documentation and information and interact with teachers. An actual case study of this environment applied to the practical work component of an advanced AI course is presented.      

在电力市场环境下网嵌入的边际成本输电定价新方法

为适应输电网开放使用并建立电力市场的大趋势,输电定价问题已成为各国竞相研究的新问题之一。现有的各种方法或是缺少经济学信息,或是难以做到年收支的平衡,或是要求输入的数据太多而难以实现。本文发展了一种方法,它本质上仍然是一种边际成本方法,但在其目标函数中嵌入了反映输电网固定成本的过路费率,因而它既保留了边际成本定价中的各种经济学信息如阻塞成本等,又有利于年支出的回收。由于采用了简明高效的线性规划算法,     

Speed-accuracy tradeoff during performance of a tracking task without visual feedback

To help people with visual impairment, especially people with severely impaired vision, access graphic information on a computer screen, we have carried out fundamental research on the effect of increasing the number of detection fields. In general, application of the parallelism concept enables information to be accessed more precisely and easily when the number of sensors is high. We have developed a "Braille Box" by modifying Braille cells to form a tactile stimulator array which is compatible with the fingertip. Each pin can be controlled independently so that we can change the size and type of array in order to study the tactile perception of both simple and complex graphical forms. Our results show that by applying the parallelism concept to the detection field, people with visual impairment can increase the speed of exploration of geometric forms without decreasing the level of accuracy: thus, avoiding a speed-accuracy tradeoff. Further experiments need to be done with this Braille Box in order to improve the device and help people with visual impairment access graphic information.     

物流联盟企业的云计算公共技术平台的体系结构

分析云计算时代企业管理信息系统的特点,研究了其基于计算资源共享的技术构架.通过云计算公共技术服务平台建立物流联盟企业的信息系统,使供应链上的众多企业能以更加精细和动态的方式管理生产和物流,降低中小企业的信息化运营成本,从而实现智能的绿色物流.     

A computer-aided, total quality approach to manufacturing educationin engineering

This paper describes an ongoing study in improving entry-level engineering education through the deployment of new teaching and learning tools. We introduce a computer-aided interactive multimedia manufacturing courseware. To improve manufacturing education we need to change not only the process of teaching and learning, but also provide new tools and technology that promote efficient learning and make it widely available and continuously improving. To address this manufacturing education challenge, we are presently designing a program based on a new computer-aided education paradigm that embodies total quality management (TQM) and critical thinking (CT) concepts. An interactive multimedia manufacturing courseware lies at the heart of this new computer-aided education paradigm. The manufacturing engineering multimedia courseware (MEMC) includes: on-line lectures, audiovideo education tools, interactive computer software, on-line assignment and exams, information about faculty, and on-line evaluation tools to obtain users' feedback to enhance teaching. It also makes access available to related academia, industry, and government research and education information through the World Wide Web. In this paper, we briefly review the status of engineering education in the United States and describe the appropriateness of unifying the concepts of TQM and CT. Additionally, we provide details of how these concepts can be used in an educational model     

基于PSCAD/EMTDC的多端柔性直流输电系统并行仿真计算

对于基于模块化多电平换流器的多端柔性直流输电系统以及直流电网而言,传统基于串行结构的电磁暂态仿真软件已无法满足实际的计算需求,需要采用并行计算技术突破这一难题。PSCAD/EMTDC是世界上广泛使用的电力系统电磁暂态仿真软件,其最新版本已经全面支持并行计算。通过大模型拆分和多线程运算,该软件解决了由于模型过大而不能仿真或仿真效率低的问题,为实现多端柔性直流输电系统以及直流电网的快速仿真提供了可能。详细分析了PSCAD/EMTDC软件的运行机理及功能,对其新版本下的并行计算功能进行了介绍和研究。通过搭建模型进行仿真测试,探讨了并行计算的技巧。仿真结果表明,并行计算功能可以大大降低大规模电力系统的仿真时间,有效提升仿真分析效率。     

Virtual private networks

A virtual private network (VPN) can help resolve many of the issues associated with today's private networks. A VPN facilitates an agile IT infrastructure. Global VPNs enable connectivity to all locations anywhere in the world at a fraction of the cost of dedicated links. VPN services enable remote access to the intranet at significantly lower cost, thus enabling support for a mobile workforce. Additionally, the VPN architecture support a reliable authentication mechanism to provide easy access to the intranet from anywhere using any available access media including analog modems, ISDN, cable modems, DSL and wireless. There are primarily three types of VPN services: (1) local area network (LAN) interconnect VPN services, (2) dial-up VPN services, and (3) Ethernet VPN services     

云计算环境中旁路攻击防范研究

云计算模式可以有效降低单点计算造成的能耗和维护费用,提高系统可靠性,在电力信息系统中具有广泛的应用前景。但是云计算中的数据安全和隐私保护问题一直受到关注,其中,旁路攻击是最大的安全威胁之一。为解决该问题,文章对云计算环境中的旁路攻击防范技术进行了深入研究,提出了旁路攻击模型和旁路攻击防范模型,并对旁路攻击防范的关键技术进行了建模分析,为电力系统安全有效实施云计算提供了理论支持。     

基于主观贝叶斯方法的电力系统故障诊断

提出将主观贝叶斯方法应用到电力系统故障诊断中,并与贝叶斯网络方法相结合,既克服了贝叶斯网络方法参数难以获得的问题,又发挥了贝叶斯网络在推理方面的优势.在用主观贝叶斯方法进行推理计算时,对贝叶斯网络进行了2步合理的简化,使得算法更为简单高效.针对故障诊断中的不完备信息情况,应用了证据的不确定性推理和比较异常事件数2种方法.在应用比较异常事件数的方法时,为解决大量信息缺失时出现的组合爆炸问题,对贝叶斯网络进行了分层,提出利用已有的继电保护信息推断缺失信息状态、删除不重要的缺失信息等规则,明显减少了计算量.大量算例表明了该方法的合理性和实用性.     

无线通信技术在电力通信中的应用

当今全球无线通信领域热点不断出现,如何利用包括3 G、W iMAX、MMDS、LMDS、WLAN等新技术,构建坚强可靠的电力通信网,已成为电力通信一个课题。文章结合电力通信的特点,通过对无线新技术特性的分析,展望了其在电力通信系统的应用前景,目的是将电力通信专网建设成高带宽、IP化、具有强QoS保证的信息通信网络平台。     

基于Web的继电保护故障信息实时发布软件的设计及实现

通过论述继电保护故障信息系统实时web发布软件的设计过程及关键技术介绍,提出了建设继电保护故障信息实时发布系统较好的解决办法。通过该系统的建立,为各级调度运行及相关人员通过网页浏览器简便、快捷的访问故障信息系统提供了可靠的支持。该系统已开发完成并在安徽电网应用,目前运行状况良好。     

火电厂厂级监控信息系统实时／历史数据库采用PC数据访问机制的建议

章结合现有信息技术的发展和发电企业的SIS应用需求，提出规范实时／历史数据库数据访问的建议，推荐实时／历史数据库能够以OPC方式提供一致的、标准的数据访问机制，以利于提高开放性和互操作性，简化电力企业的数据与应用集成。     

A foundation for enhancing your IEEE involvement

As early as my sophomore year in college, I began receiving calls from my university alumni association soliciting donations. Earning my college degree seemed to make me an even bigger target for charitable solicitations from various organizations. There are so many worthy organizations, and it's great to help our universities prepare for future generations of graduates, but students and young professionals may not have philanthropic resources available, especially as we tackle student loans and save for our futures. We all may be a little guilty of avoiding or ignoring information coming from nonprofit organizations, thinking they are just trying to get something out of our paltry bank accounts, although they may have an important message to share.     

风电功率预测信息在日前机组组合中的应用

将风电功率预测信息纳入电力系统调度运行是解决风电波动的主要技术之一.受自然条件影响,风电功率预测的精度仍然较低.描述风电功率的不确定性并在机组组合中使用该信息,可提高机组组合决策的鲁棒性.文中分别采用点预测、区间预测和分位点预测描述风电功率的不确定性.在此基础上,分别建立了适合各种风电功率预测信息的机组组合模型.最后,...     

基于网格计算的电力系统分布式监控实验系统

提出一种基于网格计算的电力系统监控基础平台,该平台很好地利用了网格计算的分布式信息处理能力来处理广域电力系统的监控问题。设备终端的数据采集计算设备虚拟化为各种异构的数据库,网格节点内部通过驱动程序来实现对各异构数据库的统一访问,因此,涉及到采用了虚拟数据库技术,基于网格计算开发平台G lobus来实现。实验室测试结果表明,该实验平台能够较好地完成系统数据的监控任务,为基于网格计算的电力系统分布式监控的真正实施,提供了一种有效的模式。     

普适计算中的定位隐私保护研究

普适计算将用户的隐私范围从数字世界扩展到物理世界,其中最显著的就是用户的物理位置暴露在计算环境中。因而定位隐私保护研究逐渐成为普适计算领域的一个研究热点。通过对定位隐私的内涵和界定的分析,将定位隐私保护技术划分为主动保护和被动保护两类。分别阐述了其基本特征、设计思想和最新研究发展趋势。在此分析框架下,总结了隐私敏感系统的设计需求,对比了不同分类保护技术的优缺点、应用场合和性能。最后,讨论了存在的问题,指出了未来的研究方向。     

火电厂SIS系统中实时数据库平台的选择

实时数据库平台是厂级监控信息系统(SIS)的核心部分，它的合理选择对于SIS建设具有重要意义。该文在介绍火电厂SIS系统的基础上，提出实时数据库平台的选择应该根据数据存储效率、系统访问结构和接口技术等方面进行。同时以某电厂的SIS建设为例，阐述了该电厂的SIS系统结构和实时数据库平台的一系列具体解决方案，讨论和分析如何采取措施满足数据的实时性要求、多系统间的连接技术、数据安全性和网络安全性等重要问题，为其他电厂选择和建立实时数据库平台提供了借鉴。     

纽约州能源效率和可再生能源计划

美国纽约州能源研究和开发管理局(NYSERDA)提供各种计划帮助纽约州居民和企业提高能源效率。这些计划为纽约人提供了各种渠道去获得资金和技术专长,学习成熟的清洁能源技术和减少能源浪费的流程,并使得人们在省钱的同时能够保护环境。NYSERDA提供资源、专业知识和客观信息,使得纽约人可以做出明智的能源决策。NY-SERDA计划分成5个系列,每个系列代表一个互补的组提供该区域的能源重点和目标。     

Analysis of annotations on documents for recycling of information

In order to make collaborative business activities fruitful, it is essential to know characteristics of organizations and persons in more details and to gather information relevant to the activities. In this paper, we describe a notion of “information recycling” that actualizes these requirements by analyzing documents. The key of recycling information is to utilize annotations on documents as clues for generating user profiles and for weighting contents in the context of the activities. We also propose a method of extracting annotations on paper documents just by pressing one button with the help of techniques of camera‐based document image analysis. Experimental results demonstrate that it is fundamentally capable of acquiring annotations on paper documents on the condition that their electronic versions without annotations are available for the processing. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 165(2): 60–68, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20516