基于MCS－51的PLC数据存储系统

给出了一种基于MCS－51单片机的PLC数据存储系统的设计方案,采用自由端口模式完成PLC控制器与单片机的数据通信,利用CH376接口芯片实现单片机对U盘等移动设备的数据读写,从而将PLC控制器采集到的数据存储在U盘、移动硬盘等存储设备里,便于数据存储和使用。     

基于FPGA和DSPIC30F6014A的数据记录器设计

针对目前飞行数据记录器对数据的大容量和高速存储的需求,提出了一种以DSPIC30F6014A控制USB接口芯片CH378读写U盘数据,并添加FPGA控制读写大容量Flash数据作为高速数据缓冲以实现脱离计算机存储高速大容量数据至U盘的设计方案。该方案能够实现大容量数据存储功能,并能够极大地提高U盘读写数据的速度,具有设备体积小、成本低和便于携带等优点,很大程度缓解了数据存储的压力,具有很广阔的应用前景。     

基于CH378的便携式高速数据采集系统设计与实现

针对数据采集系统在速度、容量和体积方面的需求,文中提出了一种基于FPGA的便携式高速数据采集系统方案,采用可充电锂电池作为供电电源,采用FPGA控制读写大容量Flash数据作为高速数据缓冲,控制USB接口芯片CH378完成对U盘的读写操作,实现大容量数据的可靠和便携存储;详细介绍了该测试系统的设计背景、硬件电路的设计依据、固件程序的设计思想和测试系统的具体实现;实验结果表明,该系统具有成本低、通用性强、可靠性高、便携式操作等优点,能够实现数据的高速采集,海量存储,实现了脱离计算机直接存储数据至U盘的功能。     

大容量存储测试系统设计与实现

介绍了一种基于AT89S52单片机所构成的大容量存储测试系统的设计。该测试系统采用CH375芯片作为USB主控芯片,使用普通U盘为存储设备用以存储MTX传感器采集到的大量多参数数据,配备相应的软件实现数据的再现,方便与计算机的数据交换,并给出了相应硬件电路以及软件的设计。最后,给出了设计调试结果,证明系统设计方案的可行性。     

基于单片机的嵌入式USB主机系统的实现

在无操作系统的单片机系统中实现USB主机系统功能.对U盘进行文件的读写.并在U盘上实现FAT格式文件系统.使U盘成为单片机应用系统的存储设备.这极大的方便了单片机在数据采集,存储以及传输方面的应用.最后,实现了脱离PC机的对U盘操作的功能,数据能够脱离PC机在U盘之间方便简洁的交换.     

基于USB-Host的大容量数据采集系统的设计

利用USB主控制器控制U盘作为数据采集系统的移动存储器。该设计基于USB主／从控制芯片CH375S，遵守大容量存储设备类规范中的Bulk—Only和UFI子规范，支持FAT16文件系统，实现了数据采集系统中可用U盘进行数据存储，方便与计算机交互；配合液晶和外扩键盘，可以完全抛开PC，实现采集数据的实时显示和指定存储区域内数据的查看。     

低成本的U盘数据采集器设计

引言工业现场一般都需要数据采集器来完成各类数据采集任务。在很多实际应用中,往往要求数据采集器具有工作可靠、成本低廉、操作简单、数据便于收集和计算机分析等特点。U盘作为新型移动存储设备,以体积小、速度高、抗震动、通用性强的特点倍受青睐[1]。如果能在嵌入式数据采集系统中实现USB主机功能,那么嵌入式数据采集器就能像PC机一样方便灵活地利用U盘这类USB存储设备进行数据存储。本文以带有片上A/D转换器的C8051F340处理器和USB接口芯片CH375为基础,设计了一款可对100kHz以下的低频模拟信号进行10位深度采样的低成本数据采集器。该数据采集器具有USB主机功能,可将采集的数据以FAT32文件系统格式直接存储到普通U盘中。数据采集完毕后,用户可直接从采集器上取下U盘,利用计算机方便地实现对采集数据的收集和分析处理。下面分别介绍数据采集器系统方案设计和系统软硬件设计。图1数据采集器方案框图1系统方案设计系统方案如图1所示,系统主要由C8051F340单片机和USB接口芯片CH375构成。被测信号首先通过调理电路的抗混叠滤波和限幅处理,然后送给单片机片上A/D转换器进行采样,当采样数据达到一个扇区512字节后...     

基于CH375的单片机U盘控制器的设计与实现

介绍了一种以USB接口芯片CH375和单片机为核心,U盘为存储介质的数据存储方案,给出了系统硬件实现和单片机读写U盘的应用程序。实验结果表明,该方案具有成本低、通用性强、可靠性高等特点,可方便地集成到各种测控系统中。     

基于非易失性存储器的存储引擎性能优化

非易失性存储器具有接近内存的读写速度,可利用其替换传统的存储设备,从而提升存储引擎的性能。但是,传统的存储引擎通常使用通用块接口读写数据,导致了较长的 I/O 软件栈,增加了软件层的读写延迟,进而限制了非易失性存储器的性能优势。针对这一问题,该文以 Ceph 大数据存储系统为基础,研究设计了基于非易失性存储器的新型存储引擎 NVMStore,通过内存映射的方式访问存储设备,根据非易失性存储器的字节可寻址和数据持久化特性,优化数据读写流程,从而减小数据写放大以及软件栈的开销。实验结果表明,与使用非易失性存储器的传统存储引擎相比,NVMStore能够显著提升 Ceph 的小块数据读写性能。     

基于CH375的USB数据传输

本文针对在苹果园中监测测量控制等系统中无法方便的把数据传输给移动设备的情况,在此介绍了一种以USB接口芯片沁恒CH375和MCS51单片机为核心,U盘、移动硬盘等为存储介质的数据存储方案。本模块给出了硬件电路的设计和U盘的读写程序,并指出了易出错的调试细节。实验结果证明,该方法具有成本低,可靠性高,通用性强,可以简便地集成到各种监测、测控系统中。     

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.