H.264高清编码器系统的设计与仿真

常用软件编码方法在用于H.264标准时,很难实现对高清视频的实时解码。为此,提出软硬件协同设计的方法,对H.264高清编码器系统进行软硬件划分及任务分配,分别设计软件部分和硬件部分。建立软硬件协同仿真环境,对整个系统的功能和性能进行仿真,采用约束随机验证的方法提高验证的功能覆盖率。仿真结果表明,该编码器系统能够对 1 024×768像素的图像帧进行编码,满足实时编码的要求。     

支持平台设计方法的系统芯片协同设计环境

面向基于平台的设计方法,开发了系统芯片软／硬件协同设计环境YH—PBDE．在描述YH-PBDE的总体结构之后,详细介绍了该环境中的三个设计层次与二次映射过程,重点论述了YH—PBDE中基于约束任务流图的系统建模方法、具有初始信息素的蚂蚁寻优软硬件划分算法和基于层次有向无环图的设计约束分配方法．结合具有录音功能的MP3播放器芯片的系统级设计方法,说明了在YH—PBDE中进行系统芯片软硬件协同设计的过程。     

甚低码率视频编码器的TMS320C80实现

介绍了单片多处理器数字信号处理芯片ＴＭＳ３２０Ｃ８０的架构。并提出了Ｈ．２６３视频编码器软件实施方法和技巧。根据此方案在单片ＴＭＳ３２０Ｃ８０上实现了Ｈ．２６３视频编解码器。     

基于ESL的MEPG-4解码SoC软硬件协同设计

随着SoC(System on Chip)系统设计复杂度的不断提高,设计前期在系统级别进行软硬件规划对SoC 性能的影响日趋增加,在复杂视频解码SoC 设计中迫切需要高效的性能分析和验证平台从架构层次上优化性能.将基于电子系统级设计(Electronic System Level , ESL)仿真方法在MPEG-4 视频解码SoC 软硬件协同设计中的应用,利用ARM SoC-Designer ESL 平台分析软件算法的瓶颈,实现软硬划分.通过SystemC 对硬件单元周期精确建模,最终实现了MEPG-4 解码软硬件协同仿真验证.实践证明利用ESL 进行系统设计不仅可以有效提高仿真速度而且设计的视频解码硬件能有效改善系统的性能.     

SoPC与嵌入式系统软硬件协同设计

软硬件协同设计是电子系统复杂化后的一种设计新趋势,其中SoC和SoPC是这一趋势的典型代表。SoPC技术为系统芯片设计提供了一种更为方便?灵活和可靠的实现方式。在介绍系统级芯片设计技术的发展由来后,重点介绍SoPC设计系统芯片中的软硬件协同设计方法,并指出它比SoC实现方式所具有的优势。     

基于TMS320C6211的H.263编码器设计

依据H．263视频编码标准,在一颗DSP芯片上完成视频编码器的设计工作,以实现高质量的视频流的传输。该编码器是视频服务器的重要组成部分,其硬件平台选用TI公司的基于TMS320C6211DSP芯片的图像采集装置,软件开发环境采用CCS2．20．18。编码器不仅可以实时处理视频信号,而且还满足了高压缩比的要求,并且降低了系统成本。设计结果表明：在一棵DSP芯片上实现实时的H．263编码方案,并且满足高质量、低带宽传输的系统要求是完全可行的。     

基于多代理系统的软硬件协同设计

为使软硬件协同设计过程更具分布性、自主性及并行性,在软硬件协同设计中引入多代理(MAS)技术,提出软硬件协同设计的MAS模型,包括系统描述Agent、软硬件划分及映射Agent、软硬件设计Agent、协同通信Agent、性能评估Agent和硬件系统测试Agent的构建和应用。采用多个目标代理映射、协商的方法协调整个协同设计过程。实际应用表明,该方法能优化系统级芯片设计方案、软硬件结构和功能,并提高系统整体性能。     

基于遗传算法的软硬件划分方法

针对SOC软硬件协同设计中的软硬件划分问题,首先构建了软硬件划分的系统模型,讨论了影响SOC性能的价格、执行时间、功耗、面积等因素及其相互关系。在此基础上,提出了一个旨在实现最优性价比的目标函数,并结合软硬件划分问题自身的特点对传统遗传算法的遗传操作进行了改进,在Matlab中进行了软硬件划分方法的仿真,仿真实验获得的结果有力地证明了算法的稳定性和有效性。同时,该算法在MPEG-2视频解码芯片设计中得到了实际应用,芯片设计的结果良好地反映了设计目标,证明了算法的实用性。     

系统集成芯片综述

集成电路芯片工艺的发展已可使一个系统或一个子系统集成在一个芯片上 ,称为系统集成芯片。本文综述了系统集成芯片的硬件构造、超长指令 (VLIW )结构、芯片嵌入软件及软硬件协同设计方法。     

CIMS仿真环境设计

本介绍ＣＩＭＳ仿真环境设计过程，对ＣＩＭＳ设计方法和功能结构进行了研究，提出了具有特色的计算机软硬件配置结构。本系统开发为实际ＣＩＭＳ的设计开发提供了理论与经验，也为各种ＣＩＭＳ单元技术的研究和ＣＩＭＳ集成方法的研究提供了实验环境。     

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.