基于FPGA的可重构JH算法设计与实现

针对现有可重构JH算法硬件实现方案吞吐量较低的问题,利用查找表方法对S盒进行优化,使改进的JH算法在现场可编程门阵列上实现时具有速度快和面积小的特点,在此基础上提出一种可重构方案。实验结果证明,该方案最高时钟频率可达322.81 MHz,占用 1 405 slices,具有资源占用少、性能参数较好、功耗较低等特点。     

单片FPGA的小型非制冷红外机芯设计

针对传统的基于数字信号处理器(DSP)+现场可编程门阵列(FPGA)的非制冷红外机芯平台存在体积大、功耗大、实时性差、系统集成度低等不足,提出了一种基于单片FPGA的小型化非制冷红外机芯平台设计.针对25μm非制冷红外探测器,为满足小型化、低功耗要求,平台在采用先进的FPGA处理器和DDR3存储器技术的同时,将硬件逻辑算法与NIOS Ⅱ软核相结合,完成对红外探测器的时序驱动、温度控制、图像的非均匀性处理、图像增强以及各种人机接口控制.实验结果表明:该系统成像质量较高,系统功耗小于2W,系统延时小于0.5ms,系统具有较强的可拓展性.     

Keccak算法|海绵结构|哈希算法|可重构|现场可编程门阵列

在分析研究Keccak算法的基础上,针对现有Keccak算法的硬件实现方案版本单一,应用不灵活的问题,设计了一种高性能可重构的Keccak算法硬件实现方案。实验结果表明:该方案在Xilinx 公司的现场可编程门阵列(FPGA)Virtex-5平台上的时钟频率可达214MHz,占用1607slices;该方案具有吞吐量高(9131Mbps),应用灵活性好,可支持4种不同参数版本的优点。     

AES加密算法的高速低功耗ASIC设计

本文提出了一个AES加密算法的高速低功耗ASIC设计方案,使用Synopsvs设计流程和VeriSilicon 0.18μm CMOS工艺,实现了最高工作频率410MHz,数据吞吐率5.23Gbps,功耗为58 mW.采用改进算法(T盒算法),将轮变换操作中的不同步骤合并为一组表的查询,有效降低了关键时序路径的传输延迟,并通过动态功耗管理和门控时钟等低功耗设计方法有效地降低了功耗.     

基于MSP430单片机的主动式RFID标签的设计

本文介绍了基于MSP430F1111a单片机的一种低功耗主动式RFID标签的设计,对如何解决主动式RFID标签功耗高,使用时间短,性能不稳定的问题进行探讨,详细阐述了主动式RFID标签的低功耗的设计思想、硬件结构和软件的设计方法.     

AES加密算法的高速低功耗ASIC设计

本文提出了一个AES加密算法的高速低功耗ASIC设计方案,使用Synopsys设计流程和VeriSilicon0.18μmCMOS工艺,实现了最高工作频率410MHz,数据吞吐率5.23Gbps,功耗为58mW。采用改进算法(T盒算法),将轮变换操作中的不同步骤合并为一组表的查询,有效降低了关键时序路径的传输延迟,并通过动态功耗管理和门控时钟等低功耗设计方法有效地降低了功耗。     

手持式RFID读写器的低功耗设计与测试

为满足手持式RFID读写器的低功耗要求,提出了一种在低功耗硬件的基础上,通过软件调节系统的工作时钟频率和管理系统的工作模式来降低读写器系统功耗的设计方法.并为测试系统的功耗设计了相应的测试软件.测试结果表明,该低功耗设计方法可有效地降低系统的功耗.     

基于PRESENT算法的安全标签基带设计

针对无线射频识别( RFID)标签芯片中存在的安全问题,设计一款具有安全功能的UHF RFID标签基带,该基带遵循我国自主射频识别空中接口协议GJB 7377.1-2011。通过研究RFID标签的设计需求和安全策略,给出基于PRESENT加密算法和安全协议的标签安全性设计方案。基带设计采用寄存器分时复用、功耗管理、多时钟域设计、门控时钟等低功耗策略。实验结果表明,该数字基带符合自主标准,具有安全功能,基带总面积为339.84μm ×332.56μm,其中安全模块占总面积的36.5%,基带总功耗低至5.26μW。     

基于MSP430单片机的主动式RFID标签的设计

本文介绍了基于MSP430F1111a单片机的一种低功耗主动式RFID标签的设计,对如何解决主动式RFID标签功耗高,使用时间短,性能不稳定的问题进行探讨,详细阐述了主动式RFID标签的低功耗的设计思想、硬件结构和软件的设计方法。     

RFID标签加密算法设计及FPGA实现

为提高超高频射频识别(RFID)系统的安全性,需在RFID标签芯片中集成必要的加密算法.为此,通过分析Grain-128加密算法的工作原理和在实际应用中的使用方法,设计算法的硬件架构,并采用VHDL语言编写,在现场可编程门阵列(FPGA)芯片上进行实现.实验结果表明,该算法共需384个时钟周期产生可供加解密的密钥流,仅占用54个Slices的FPGA逻辑资源,可用于在RFID标签芯片中进行安全加密.     

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.