DVB-H在手机移动电视中的应用

本文对最新的DVB—H标准进行介绍，并介绍了此标准技术在便携式移动终端（手机）的最新应用情况．并探讨了数字电视地面广播的发展方向及前景。     

基于DVB-T的DVB-H技术

随着数字广播标准经过十多年的发展,尤其是数字电视地面广播(DVB-T)标准的建立并在世界范围内的运用,数字视频广播(DVB)现在已坚定地将目光投向视频信号的移动设备接收(DVB-H)和固定IP广播网(IPDC),而这两者都是以数字电视地面标准为基础的。本文将介绍数字电视地面广播标准成功经验,并结合这一标准着重介绍了DVB-H的发展。     

三足鼎立：地面数字电视标准

众所周知，拟电视有NTSC、PAL和SECAM种制式。目前，数字电视也陷入了这种局面，美国、欧洲和日本各自形成三种不同的地面数字电视标准。美国的标准是ATSC（Advanced Television System Committee，先进电视系统委员会）；欧洲的标准是DVB（Digital Video Broadcasting．数字视频广播）；日本的标准是ISDB（Integrated Services Digital Broadcasting．综合业务数字广播），而在2006年8月，我国的地面数字电视标准也正式推出，并被强制执行.     

数字的脉动--感受申城的数字电视

尽管全国计划要到2015年才开始停止播放模拟电视,实现真正意义上的数字电视,但至今还没有一个普通家庭能收看数字电视,尽管我们能感受到数字电视蓬勃兴起的阵阵脉动,数字电视采用DVB（Digital Vidio Broadcasting）标准,即数字视频广播。DVB又根据传输体制的不同分为DVB-C、DVB-T、DVB-S三类,其中C、T、S分别为     

基于DVB数据广播系统的软件结构

根据DVB数据广播的标准，设计了底层数据广播的软件结构，以提供独立于硬件平台的软件接口。介绍了DVB数据广播标准，并讨论了系统的设计思路，软件结构及具体应用实例。     

从欧美日数字电视标准发展中看中国数字电视标准的发展

本文从数字电视技术标准的意义谈起,分别回顾了美国ATSC标准、欧洲DVB标准、日本ISDB标准的制定和发展,以及我国数字广播电视标准化工作的现状,介绍了数字电视地面系统标准及其关键技术。     

浅谈DVB-C系统在数字电视中的应用

根据DVB—C的原理,提出基于DVB—C的数字电视系统实现方法。阐述DVB前端、条件接收系统（CAS）的加密体系、电子节目指南（EPG）系统方案、宽带传输网络、用户终端DVB接收系统等技术原理和系统组成。同时对DVB-C系统技术方案进行一些技术探讨和总结。     

浅谈DVB—C系统在数字电视中的应用

根据DVB—C的原理,提出基于DVB—C的数字电视系统实现方法。阐述DVB前端、条件接收系统（CAS）的加密体系、电子节目指南（EPG）系统方案、宽带传输网络、用户终端DVB接收系统等技术原理和系统组成。同时对DVB-C系统技术方案进行一些技术探讨和总结。     

DVB通用接口的关键技术及实现方法

本文首先介绍了DVB条件接收系统的发展现状以及基本原理，然后针对机卡分离的DVB—CI通用接口技术和通用接口协议栈作了详细的阐述，对其接口从应用层到底层的协议特性和功能进行了分析和研究，并提出了通用接口的软件设计方法，实现数字电视条件接收功能，指明了DVB通用接口在条件接收系统中的作用重要性和广阔的应用前景。     

DVB条件接收系统公共接口(CI)的研究与实现

本文首先介绍了数字电视广播(DVB)条件接收系统所涉及的技术和标准,指出DVB公共接口在CA系统中的作用,对其接口从应用层到底层的协议特性和功能进行了分析和研究,从用户和运营商角度实现技术的选择和竞争,针对DVB条件接收的多密技术,给出了一例实际的机顶盒公共接口的设计和实现。     

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。     

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.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.