一种宽带流媒体软件终端的设计和实现

提出了一种运行在IP宽带网、基于DirectShow技术、支持IPTV直播业务和VOD点播业务、在PC平台下的宽带流媒体软件终端。着重于整个软件终端系统的构架、各功能模块的功能设计、以及MPEG-2解码中的关键技术。     

西门子IPTV承载网解决方案

1.背景 IPTV承载的最主要内容包括视频点播(VOD)及电视频道(TV)节目.为了能够实现较好的IPTV效果,不仅对于节目源,编解码,等视频处理部分有较高要求,IPTV承载网要求能在带宽、频道切换时延、网络QoS等方面提供更好的保证.     

基于嵌入式浏览器的交互式IPTV

交互式IPTV的核心服务之一是视频点播服务(Video On Demand)。IPTV的系统基于IP网络,这一特点有助于设计更好的VOD交互模型。提出了一种使用嵌入式浏览器作为VOD点播终端的新设计方法。     

我国终有世界水平VOD——爱必得SMARTVODⅡ技术优、报价不足进口品1/2

由爱必得电脑公司投资,清华、北大多家实验室合力瞄准国际先进VOD技术,12月22日研发成功了爱必得SMART VODII系统,其性能可与11月底才问世的IP TV等VOD系统相比,全数字化、无等待、零管理、可     

电信应对OTT TV的IPTV发展策略浅析

本文分析了OTT TV业务在目前的发展情况,并与电信的IPTV业务进行了比较,通过SWOT分析,明晰了电信IPTV在OTT业务冲击下所面临的问题,由此提出了近期发展IPTV的策略,即利用OTT优势,进行技术和内容的融合,并对中远期发展提出了建议。     

IPTV宽带增值业务的新热点

近年来IPTV在日本、台湾、香港等地都相继取得了成功，对促进宽带业务发展。提高运营收入起到了很大的作用，并已经引起各地运营商的广泛关注。IPTV利用电视机作为显示终端，通过机顶盒接人宽带网络，可以向用户提供数字广播电视、VOD点播、视频录像、在线游戏、电视上网、收发邮件等诸多宽带业务，     

基于IPTV的媒体获取系统的研究和设计

随着技术的快速发展,IPTV逐渐取代传统的TV。在IPTV的三种媒体获取方式——外部存储设备、远程共享目录和DLNA设备的基础上,设计一种新型的IPTV系统。该系统融合三种媒体获取方式,同化三种获取方式间的差异,增强IPTV的稳定性。     

基于IPTV的媒体获取系统的研究和设计

随着技术的快速发展,IPTV逐渐取代传统的TV。在IPTV的三种媒体获取方式——外部存储设备、远程共享目录和DLNA设备的基础上,设计一种新型的IPTV系统。该系统融合三种媒体获取方式,同化三种获取方式间的差异,增强IPTV的稳定性。     

WiMAX接入技术在IPTV系统中的应用研究

在分析IPTV接入网的要求和WiMAX技术优势的基础上,提出了WiMAX应用于IPTV的系统模型,并具体分析了系统流程;针对IPTV业务下行数据量比较大的特点,提出了适合IPTV业务特点的下行链路实时调度(DLRTS)算法,该算法的主要目的在于降低实时业务的时延,从而保证IPTV的服务质量(QoS)。仿真结果表明,与常用的轮叫调度(Round R0bin)算法相比,本文算法在实时业务的时延和吞吐量两方面的性能都有明显提高,可很好地支持IPTV业务。     

VOD on LAN的网络协议性能分析

目前,人们对在IP网络上VOD业务的需求与日俱增,在LAN上实现中小型VOD系统的技术也日益成熟。在网络传送协议方面,许多观点认为,TCP协议不适合于实时的视频数据传送,而是采用了UDP来实现数据传送。中心在以太网上开发了一个VOD系统,在网络传送协议方面采用了TCP来实现。并在此基础上对系统的各项性能进行了测试及分析,该文就两种协议在网络性能方面进行了比较,并对网络时延、流量控制、丢包重传等方面进行了探讨。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.