Media synchronization in multimedia Web using a neuro-fuzzyframework

We consider the problem of multimedia synchronization in a Web environment. The workload generated by the multimedia server during a Web session exhibits variations that are quite different from the traffic fluctuation offered by a single media stream, e.g., a variable bit rate (VBR) video. We propose a set of parameters that can be used to characterize the workload generated by the multimedia server in a Web-type browsing environment. The workload characterization scheme is subsequently used in designing a server-based synchronization scheme. The problem of scheduling multimedia information to ensure media synchronization in a Web environment is identified as a multicriteria scheduling problem, which is NP-hard. The ability of fuzzy control to deal with multivariables makes it a good alternative for the multicriteria scheduling problem considered. Consequently, we propose a neuro-fuzzy scheduler (NFS) that makes an intelligent compromise among multicriteria by properly combining some scheduling heuristics. Performance of the NFS is compared with several known heuristics and a branch and bound algorithm. The results show that the proposed NFS ran dynamically adjust to the varying workload quite well     

基于Web的基本放大电路分析多媒体课件

笔者针对《模拟电子技术基础》中的基本放大电路分析部分,采用Web风格技术,制作成多媒体课件;介绍了这套课件的内容描述、实现方法、主要特色和教学实践。     

Reusable multimedia content in Web based learning systems

We discuss reusability aspects of interactive multimedia content in Web based learning systems. In contrast to existing approaches, we extend a component based architecture to build interactive multimedia visualizations by using metadata for reusability issues. The experiment we conducted shows how to reuse the same visualization in different learning contexts     

Application-level differentiated multimedia Web services usingquality aware transcoding

The ability of a Web service to provide low-latency access to its content is constrained by available network bandwidth. While providing differentiated quality of service (QoS) is typically enforced through network mechanisms, in this paper we introduce a robust mechanism for managing network resources using application-specific characteristics of Web services. We use transcoding to allow Web servers to customize the size of objects constituting a Web page, and hence the bandwidth consumed by that page, by dynamically varying the size of multimedia objects on a per-client basis. We leverage our earlier work on characterizing quality versus size tradeoffs in transcoding JPEG images to supply more information for determining the quality and size of the object to transmit. We evaluate the performance benefits of incorporating this information in a series of bandwidth management policies using realistic workloads and access scenarios to drive our system. The principal contribution of this paper is the demonstration that it is possible to use informed transcoding techniques to provide differentiated service and to dynamically allocate available bandwidth among different client classes, while delivering good quality of information content for all clients. We also show that it is possible to customize multimedia objects to the highly variable network conditions experienced by mobile clients in order to provide acceptable quality and latency depending on the networks used in accessing the service. We show that policies that aggressively transcode the larger images can produce images with quality factor values that closely follow the untranscoded base case while still saving as much as 150 kB. A transcoding policy that has knowledge of the characteristics of the link to the client can avoid as many as 40% of (unnecessary) transcodings     

Microelectronics and computers

The European microelectronics and computer industry, which has trailed Japanese and US competitors in technology and market share, is examined. The impact of European Community (EC) rulings and of actions taken by the various European companies is considered. As they consolidate and reorganize to better cope with the present downturn, European computer companies are also beginning to plan for the opportunities and challenges posed by integration of the EC market     

A survey of multimedia and Web development techniques andmethodology usage

The authors present survey results which suggest that no uniform approach exists for multimedia systems development and that practitioners are not using the multimedia models cited in the literature. It is concluded that developers need new techniques that capture requirements and integrate them within a systems development framework     

微电子技术的发展现状与展望

本文分析了微电子技术的发展状况,尤其对集成电路的加工和设计作了较为深入的考察。对本世纪末微电子技术各个领域的发展前景进行了展望。同时,对如何发展我国的微电子技术提出了一些意见和建议。     

微电子封装与设备

本文介绍了目前国际微电子封装的发展趋势,阐述了我国微电子封装发展的特点,说明了发展微电子封装设备的必要性,并提出发展我国徽电子封装设备的几点建议。     

Converged multimedia services in emerging Web 2.0 session mobility scenarios

The increasing request for converged multimedia services have motivated relevant standardization efforts, such as the Session Initiation Protocol (SIP) to support session control, mobility, and interoperability in all-IP next generation wireless networks. Notwithstanding the central role of SIP in novel converged multimedia, the potential of SIP-based service composition for the development of new classes of Web 2.0 services able to interoperate with existing HTTP-based services is still widely unexplored. The paper proposes an original solution to improve online user experience by integrating a SIP stack into the Web browser, thus enabling the execution of novel SIP-based applications directly at the client endpoint. In particular, our browser extension coordinates with our novel SIP-based Converged Application Server to enable session mobility and prevent abuses of the services available in the client. Experimental results show that our SIP-based solution is feasible in most common Internet deployment scenarios and enables session mobility with limited management cost.     

真空微电子的发展

本文回顾了近十年来，真空微电子在材料（硅、金属、砷化镓和金刚石膜）、制备工艺、阴极结构及应用等方面的进展。并详细介绍一些新阴极结构的制备方法与特点，供选择参考。     

Enhancing call-detail reporting using multimedia technologies

Two features have motivated the Web's growth: timely information; and information not previously available everywhere. The most common complaint about older application systems is their isolation, they are not easily accessible to others. This calls for integrating the Web, a distribution mechanism, with the application system, providing timely information. The maintenance costs of both hardware and software are comparable with the older systems. Superior information technology solutions can help us obtain such desirable results. One such solution is a call-detail application, not previously available to users through the Web having multimedia capabilities. The Advanced Telecommunications Institute (ATI) designed and implemented the call-detail reporting application, which can be directly accessed at the end-user's desktop using a Web browser. We discuss the project-enhancing call-detail reporting using multimedia technologies     

Development of a security training system based on interactive multimedia

This paper presents the development of the main modules of a highly interactive system for security training, The system allows the security professionals to feel as if they were in a real danger situation, very close to the one they may find in their work activities. Such situations create conditions for a better training and skills achievement. In order to produce the interactivity, the system exhibits a 2D movie, in real size (1:1), showing scenes and scenarios close to the reality of the professional under training. During the movie an unexpected situation of danger emerges and the user has to make quick decisions to circumvent the problem. Depending on the reactions of the user, the automated system chooses the best sequence for the movie. Afterwards, the reactions and decision taken by the users will be evaluated by computer software to determine his/her performance.     

微电子封装技术的发展与展望

综述了微电子封装技术的现状及未来的发展趋势。     

场致发射与真空微电子学

本文系统地分析了场致发射的基本理论及其修正,介绍了罗恩泽教授提出的恩泽公式同时,概述了微型真空管的结构、工艺和我们近期的工作.     

Mosfet fabrication using ion beam nitridation

Ion beam nitridation has been suggested as an alternative to the conventional local oxidation process which is used in the fabrication of most metal-oxide-semiconductor (MOS) integrated circuits. The implantation of 2 keV nitrogen ions in doses of up to 8 x 10¹⁷ cm^-2 results in the formation of a silicon nitride layer approximately 10 nm thick. Herein we describe the electrical characteristics of n-channel silicon gate metal-oxide-semiconductor-field-effect-transistors (MOSFETs) fabricated using this modified local oxidation process, and compare them to devices fabricated simultaneously but using the conventional local oxidation technology. The effective device channel lengths and widths are determined from the electrical characteristics of devices with mask (ideal) dimensions of 4, 6, 8 or 10 μm. The ion beam nitrided devices exhibit a significant reduction in the lateral oxidation effect. A 1.3 μm increase in channel width relative to conventional processing is observed for the ion beam nitrided devices with a 690 mm thick field oxide. On the other hand, fixed oxide charge densities are found to increase by a factor of about two due to the nitrogen implantation, and device channel mobilities are reduced by about 25%.