分布式槽波地震数据同步采集系统设计

为实现槽波地震数据采集系统中各个采集终端之间及同一采集终端2个通道之间的同步,设计了一种分布式的双通道槽波地震数据同步采集系统。该系统采用弱信号调理电路提高地震信号的信噪比,采用八通道同步采样芯片实现了同一采集终端上2个通道的同步采样,构建了由GPS接收机、数字锁相环及STM32主控制器组成的时钟同步系统,并采用自适应恒温晶振模型驯服算法对恒温晶振的温漂特性和老化特性进行预测和校准,使得各采集终端在矿井中仍可保持长期的时钟同步和时间同步。测试结果表明,该系统实现了分布式多通道地震信号的同步采集,在井下连续工作8h,各个数据采集终端之间的同步精度优于10μs。     

基于嵌入式系统的双通道便携式振动测试分析仪的设计

本文介绍了一种基于ARM体系结构处理器的嵌入式设备的设计理念,设计了一种应用于振动测量分析领域的双通道便携式仪器。它不但可以对旋转机械的加速度、速度和位移的振动信号进行测量和分析,还可以通过双通道同步采集数据、计算并显示轴心轨迹图,并且配备了微型智能诊断系统,可以实时地对测量数据进行分析和诊断。该设备体积很小,可以广泛应用于户外监测领域,携带方便。     

介质管等离子体物理特性自动测量系统设计

根据朗缪尔双探针诊断方法,设计了一个等离子体特性自动测量系统,给出了系统设计的原理和实现过程.系统由电源电路、ARM控制器、FPGA、FIFO、高速ADC及USB控制器构成,可以提供等离子体测量所需的特定工作电压、实现对等离子体Ⅰ-Ⅴ特性数据的同步测量,并可以对测量数据进行准确的高速传输.分析系统所采集数据得到了准确的...     

多传感数据同步采集系统设计

轨道检测方法涉及到陀螺仪、倾角仪、加速度计等多个传感器,如何实现多传感数据同步采集是实现轨道检测的关键技术之一.为了解决该问题,设计了一种多传感数据同步采集系统,该系统主要由正交编码采集电路、信号调理电路及同步触发电路构成,采用基于μC/OS-Ⅱ嵌入式编程方法,实现了陀螺仪、倾角仪、加速度计的同步采集.通过利用多传感数据同步采集系统设计了轨道检测小车,实验验证了该系统不仅可以精确实现多种传感器的同步采集,而且具有较强的抗干扰能力,其综合测量精度小于0.5 mm.     

CC2530的分布式无线数据采集系统设计

基于TI公司的第二代SoC芯片CC2530和FPGA,构建了多信道的无线传感器网络实时采集系统.采用延迟测量时间同步机制DMTS和TDMA保证了网络的时间同步及数据的可靠传输;利用FPGA实现的多路并行独立SPI接口控制各个基站,通过USB接口与外部连接来采集数据.经实际验证,该系统可以准确、实时地将监测信息上传至控制...     

一款基于Raspberry Pi的管道泄漏同步采集系统研发

设计一款基于Raspberry Pi的管道泄漏同步采集系统,其具有精准度较高的特点,由于成本较低,因此人们也可接受,其主要目的就是提供可靠的数据,以便人们更加准确地定位管道的泄漏处.系统软件是采用树莓派同步数据采集系统,硬件是采用GPS时间作为标准,这样采用软件和硬件相结合的方法保证了远程采样时间的高同步性.     

降水现象仪的数据采集系统设计

由于现有的降水现象仪的数据读取软件互不相通，实验过程中不便于同步采集数据并进行比对分析。为更严谨地对降水现象仪进行比对实验，利用Python编程环境，针对DSG1型、DSG3型、DSG5型降水现象仪设计了数据采集系统。系统包括硬件连接与软件设计两部分，主要实现数据自动采集、处理和存储等功能，为分析降水现象仪观测数据的准确可靠提供了技术支持。     

数据同步系统客户端的C语言设计研究

本文研究数据同步系统客户端的C语言设计,提出了通过数据同步系统客户端对数据同步的过程和数据进行管理和监控,本文解决了企业信息化过程中产生的多个业务系统数据库间关联数据的同步问题,特别是数据同步过程中面临的三大问题;如何准确的获取源系统的数据、如何将数据安全、及时、无误的发送给目标系统和如何对同步的数据和过程进行统一的监控和管理.     

基于FPGA双通道高速数据采集系统的设计与实现

在高性能数据采集系统的设计中,经常遇到两个问题:高采样率情况下,因申扰严重使采样数据不可靠;对物入信号幅度的自适应需要额外硬件开销,增大系统的复杂性;该设计以FPGA器件XC3S500E为核心,选用数据采集芯片MAX12529进行高速双路同步采样.配置MicroBlaze处理器管理各模块,构成一个双通道高速实时数据采集系统;在FPGA内部实现delta-sigma算法的DAC,实现增益实时控制;在采样率为100Msps时,ADC所有位数均有效;系统从合理端接、码型选择和差分时钟等技术细节方面解决了以上问题.     

基于PXI总线的高精度惯导姿态数据采集卡设计

为了满足惯导故障监测诊断系统实时高精度地采集惯导姿态数据的需要,研制了基于PXI总线的高精度惯导姿态数据采集卡。该数据采集卡能多块卡同步对惯导航向、纵摇和横摇数据进行采集。每块卡对正余弦多极旋转变压器粗精通道信号进行同步A/D转换后,利用软件对A/D转换后的数字量进行粗精组合,得到高精度的角度量供后续分析处理。介绍了采集卡PXI总线接口的硬件设计及双通道多极旋转变压器粗精组合模糊位软件消除方法。     

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。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。