源码级和算法级的功耗测试与优化

随着绿色软件概念的提出,嵌入式软件优化不再只以提高性能作为目标,嵌入式软件的功耗优化已成为低功耗软件系统的重要研究方向。在研究4种常用软件优化方法的基础上,对源码级和算法级的功耗进行测试与分析,并将分析结果运用到嵌入式操作系统μC／OS—II及其应用软件上,对μC／OS—II进行源码级和算法级的功耗优化。实验结果表明,该优化方法能有效地降低嵌入式软件的功耗。     

嵌入式系统低功耗的软件实现方案

在研究嵌入式系统软件功耗优化技术的基础之上,开发一个完整的基于μC/OS - Ⅱ的GSM终端系统.以降低该系统软件的功耗为目标,通过软件设置系统的低功耗模式,减小系统空闲时间的电量消耗.最后通过功率测量仪对优化前后的系统进行功耗测试.实验结果表明,低功耗模式比系统空闲状态下功耗下降50.86％左右.     

μC/OSII在MicrochipMCU上的移植

μC/OSⅡ是一个完整的,可移植、固化、裁减的抢占式实时多任务内核。本文着重介绍了μC/OSⅡ嵌入式操作系统内核在MicrochipPIC18F452单片机上的移植方法和实时应用程序的设计方法。     

μC/OS Ⅱ在Microchip MCU上的移植

μC/OS Ⅱ是一个完整的,可移植、固化、裁减的抢占式实时多任务内核.本文着重介绍了μC/OS Ⅱ嵌入式操作系统内核在Microchip PIC18F452单片机上的移植方法和实时应用程序的设计方法.     

μC/OS Ⅱ下LwIP协议栈的移植和测试

把嵌入式系统连接到Internet已经成为嵌入式系统一个重要发展方向.本文讨论如何在实时操作系统μC/OS Ⅱ下移植LwIP协议以及测试移植后的结果,使μC/OS Ⅱ成为支持网络通信的实时操作系统.     

μC/OS-Ⅱ在混合动力汽车总控制中的应用

混合动力汽车(HEV)控制系统一直是电动车的核心控制部分。论文介绍了其控制系统具有多任务、实时性的特点,开发了一套基于Freescale MC9S12DP256控制器与CAN总线设计的混合动力汽车管理系统,提出了在软件开发中引入嵌入式实时操作系统μC/OS—Ⅱ,并重点详述了μC/OS—Ⅱ在该系统中的移植与应用。经过理论和实验证明,该控制系统实时性强、可靠性高。     

实时嵌入式操作系统μC/OS-Ⅱ在MPC555上的移植

介绍了实时操作系统μC/OS-Ⅱ的特点和内核结构,并首次实现了μC/OS-Ⅱ在摩托罗拉处理器MPC555上的移植,介绍了移植后OS的应用方法.     

实时内核μC/OS—Ⅱ在MC68376中的实现

本文介绍了微控制器MC68376的特点和嵌入式实时操作系统μC／OS—Ⅱ的内核结构,分析了μC／OS—Ⅱ的移植方法,重点阐述μC／OS—Ⅱ在MC68376上的实现过程,指出了在移植过程中的重点和难点问题。     

μC/OS-Ⅱ在S3C2410上的移植

介绍了μC／OSⅡ的特点及相比于其他嵌入式实时操作系统的优点,探讨了μC／OSⅡ在S3C2410上移植的可能性。在此基础上,着重分析和阐述了μC／OSⅡ在S3C2410上的移植方法。该方案实时性强,运行稳定,广泛应用于各种工业场合。     

基于μC/OS-Ⅱ的FIFO设备驱动研究

介绍了嵌入式实时操作系统μC/OS以及FIFO器件,在此基础上阐述了一种基于ARM7嵌入式处理器以及μC/OS-Ⅱ系统的FIFO驱动的编写方法。     

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.