Hybrid fault diagnosis for telerobotics system

Fault detection and isolation (FDI) of a class of networked control systems (NCS), applied for telerobotics system is studied in this paper. The considered NCS application is related to telerobotics system, where it is modelled with a hybrid manner, by including the continuous, discrete, uncertain, and stochastic aspects of all the system components. The main considered components of the NCS namely the network system and controlled system are completely decoupled according to their operation characteristics. The network part is taken as a discrete and stochastic system in presence of non-structured uncertainties and external faults, while the controlled part is considered as a continuous system in presence of input and output faults. Two model based fault diagnosis approaches are proposed in this paper. The first concerns a discrete and stochastic observer applied to the network system in order to detect and isolate system faults in presence of induced delay on the network part. The second is based on the analytical redundancy relations (ARR) allows detecting and isolating the input and output system’ faults. Experimental results applied on telerobotics system, show the performance and the limit of the proposed fault diagnosis approach.     

High-frequency acceleration feedback in wave variable telerobotics

The human hand is very sensitive to the high-frequency accelerations produced by tool contact with a hard object, yet most time delayed telerobots neglect this feedback band entirely in order to achieve stability. We present a control architecture that both incorporates this important information and provides the ability to scale and shape it independently of the low-frequency force feedback. Leveraging the clean power flows afforded by wave variables, this augmented controller preserves the passivity of any environment that it renders to the user, but is not subject to the limitations of being passive itself. This architecture guarantees stability in the presence of communication delay while achieving a level of feedback not possible with a passive controller. We show experimentally that this feedback augmentation and shaping can present a high-frequency acceleration profile to the user's hand that is similar to that experienced by the slave end effector. Two simple user studies also show that the feedback augmentation improves the user's perception, performance, and confidence with the given tasks. We anticipate that these natural haptic cues will make teleoperative systems easier to use and thus more widely applicable.     

基于Internet的客户关系管理

本文分析了CRM系统的发展趋势，提出了基于Internet的CRM系统的特点和主要技术手段，论述了CRM系统同ERP系统整合的重要性和可能性。     

基于Internet的CATV用户服务系统

结合有线电视台面向用户服务的需要,使用Java语言开发了一套基于Iternet的用户服务系统,实现用户网上查询,报装和报修等功能,该系统采用B／S（Browser/Server)系统模式,并运用Java Servlet ,JDBC(Java Database Connection),SQL等技术,使用了Apache服务器软件进行系统的开发。     

Haptic information in Internet-based teleoperation

Many tasks can be done easily by humans turn out to be very difficult to accomplish with a teleoperated robot. The main reason for this is the lack of tactile sensing, which cannot be replaced by visual feedback alone. Once haptic devices are developed, their potential in many fields is obvious. Especially, in teleoperation systems, where haptic feedback can increase the efficiency and even render some tasks feasible. This paper studies Internet-based teleoperation systems that include haptic feedback, concentrating on the control of such systems and their performance. The potential of this technology and its advantages are explored. In addition, key issues, such as stability, synchronization, and transparency are analyzed and studied. Specifically, an event-based planning and control of Internet-based teleoperation systems is presented with experimental results of several implemented system scenarios in micro- and macro-scales     

基于Internet视频传输的关键技术

随着Internet带宽和计算机处理能力的迅速提高。Internet视频传输在科研和工作领域引起了人们极大的研究兴趣。介绍了Internet视频传输中的一些关键技术．包括视频的压缩、编码技术，QoS控制技术，以及视频流传输中采用的协议．媒体同步技术等，概述了Internet视频传输的发展前景。     

Internet-based distributed measurement and control applications

The NIST DMC (distributed measurement-and-control) demonstration project that has been described spans all levels of the DMC system. This multilevel data communication capability is a viable one as a result of standardized networks, protocols, and transducer interfaces. Common Internet-based software technology was used to provide the ease of data migration between the various communication pathways. Standard and de facto software languages such as C and Java were used with off-the-shelf development tools to implement the embedded network node applications and the web-based application, respectively. Internet-based TCP/IP protocols and Ethernet technology were used to design the networking infrastructure. The distributed measurement and control concept with networking sensors and actuators should work quite well with advanced system design, particularly where sensor-based monitoring and control applications are important. Taking this approach in system design can reduce the total life-cycle cost of the system by use of modular sensor system design and commercially available smart transducers with standardized interfaces, and easy maintenance and upgrade via simple plug-and-play sensor and actuator components. In addition, using standardized components and interfaces will certainly reduce interoperability problems     

The wired classroom [Internet-based education]

The many World Wide Web sites geared toward the worlds primary and secondary students attest to the potential educational benefits of this new medium. Here, the authors argue however, that in order to truly develop students' skills and broaden their horizons, educators must use the technology wisely     

基于Internet雷达终端网仿真模型

雷达信息传输是在计算机网络的基础上,利用数据通信技术、计算机技术,网络技术构造一个覆盖设定区域的雷达终端网。雷达终端网仿真模型是把每一台雷达终端都设定一个唯一的产品电子码,叫做EPC（Electronic Product Code）,通常EPC码被存入硅芯片做成的电子标签内,附在被标识产品上,被计算机信息处理软件识别、传递、查询。RFID即射频识别,是一种非接触式的自动识别技术,识别工作无须人工干预,它通过射频信号自动识别目标对象并获取相关数据,电子标签与雷达终端编码EPC融合在互联网中得到技术拓展应用,为用户提供方便、快捷的优质服务。     

互联网转型从IT基础设施互联网化开始

在"互联网+"时代,运营商正经历着轰轰烈烈的互联网转型变革。针对传统IT基础设施不能满足企业互联网转型需要的问题,文章分析优先进行IT基础设施互联网化的必要性,研究IT基础设施相关新技术,提出IT基础设施架构建议和业务开通流程改造建议,通过实践验证了规划建议的可行性,为IT基础设施互联网化规划提供建设性参考。     

Internet-based teleoperation using wave variables with prediction

Wave-based teleoperation has been previously attempted over the Internet, however, performance rapidly deteriorates with increasing delay. This paper focuses on the use of a modified Smith predictor, a Kalman filter and an energy regulator to improve the performance of a wave-based teleoperator. This technique is further extended for use over the Internet, where the time delay is varying and unpredictable. It is shown that the resulting system is stable even if there are large uncertainties in the model of the remote system (used in prediction). Successful experimental results using this technique for teleoperation in a master-slave arrangement over the Internet, where the control signal is streamed between Atlanta (Georgia) and Tokyo (Japan), are also given     

基于互联网的PC视频内容保护方法研究

介绍了一种新的基于互联网的PC视频内容保护方法,该方法提出了基于用户行为分析的认证体系,该体系根据用户历史行为,计算用户可信度作为认证评判标准,提高了认证可信度.该方法通过视频分块加密算法和添加水印的方式确保了安全性.     

建立互联网经济的生态环境

IP电器终端的发展、最终用户服务分离技术、城域网干网的建设和改造、内容供应商的商业模式以及互联网供应商的营运模式这5个互联网经济中的环节都代表着无比巨大的商业机遇。如何变商业机遇为经济现实的挑战在于能否将这五个环节有机地结合并运作起来，形成性的互联网生态系统，从而造就一个双赢互利商业环境。     

Internet-based research: providing a foundation for web-design guidelines

In this article, we propose that remote, internet-based studies of real users interacting with real websites on their own computers at a time and place convenient for them will provide a solid empirical base from which researchers can extrapolate reliable and valid web-design guidelines. After a discussion of research methods that have been used to support the principles that underlie web-design guidelines, we review some of the methodological issues associated with internet-based research and tools for supporting such work. Given advances in technology, the multitude of users online, and emerging technologies with new interfaces, the time has come for technical communication researchers to enter the arena of internet-based research and conduct remote experiments to support the web-design guidelines that they espouse.     

Internet-based system for simulation-based medical planning for cardiovascular disease

Current practice in vascular surgery utilizes only diagnostic and empirical data to plan treatments, which does not enable quantitative a priori prediction of the outcomes of interventions. We have previously described simulation-based medical planning methods to model blood flow in arteries and plan medical treatments based on physiologic models. An important consideration for the design of these patient-specific modeling systems is the accessibility to physicians with modest computational resources. We describe a simulation-based medical planning environment developed for the World Wide Web (WWW) using the Virtual Reality Modeling Language (VRML) and the Java programming language.     

Effects of Internet-based multiple-site conferences on greenhouse gas emissions

There is a growing consensus that ICT can contribute to the reduction of anthropogenic greenhouse gas (GHG) emissions, both by increasing the efficiency of existing processes and by enabling substitution effects to usher in more energy efficient patterns of production and consumption. While, however, many studies based on theoretical reduction potentials have been presented, in practice it has only been possible to cite a few examples of such reductions thus far.     

基于Internet的数据反监听检测设计与实现

Internet网络监听能有效的截获网络上的数据,对网络信息安全造成极大威胁,必须采用反监听的检测措施以保护网络信息安全.本文设计了Internet反监听检测软件可以监视网络的状态,利用几种检测方法验证检测网络性能,并提出了几种有效的网络监听的防范措施.     

用数据库构建网络远程多用户实验系统

提出了一套利用网络数据库实现的基于Internet的多用户远程实验系统。该系统可供网络上多个学生同时进行实验，且不受时间、地域的限制，极大地提高了设备和实验室的利用率，说明网络远程实验不仅是远程教育所必需的，对于全日制普通高校也是非常重要的。