基于CPLD的超声液位测量中采集卡的设计

超声波液位测量在近几年已得到广泛应用,以复杂环境下超声液位测量系统为背景,论述了该系统中高速数据采集阵的功能和结构,设计了一种基于CPLD的采集卡硬件平台,此设计利用CPLD的高集成性、硬件可重复编程性,使系统的设计过程更加的合理、紧凑和简化,并详细介绍了该高速数据采集卡各单元部分的设计方法.以高速间隙式采样获取超声信号,使用内存映射技术读取和处理超声信号.     

基于PCI总线的图像数据采集卡设计

本系统采用了通过高速数据采集系统将相机输出的数字图像数据输入计算机,然后由计算机对图像数据进行准实时处理的技术路线.完成了数据采集卡硬件电路设计、驱动程序设计以及应用软件设计等.在数据采集卡硬件电路设计中,采用了"PCI专用接口芯片 CPLD 缓存"模式,实现了计算机与外设间的DMA方式传输,数据传输率可稳定在50MB/S.     

CPLD器件在脉冲计数式数据采集系统中的应用

介绍了CPLD实现的大规模计数器与单片机构成的脉冲计数式数据采集器,用于加速度计测试系统的数据采集.采用CPLD实现脉冲计数式数据采集器,增强了系统的集成度和可靠性;用Verilog HDL语言完成CPLD的编程,使系统实现更加方便、灵活.主要介绍了测试系统的数据采集方案及单片机与CPLD的接口实现.     

基于DSP的视频采集系统设计

为了解决基于DSP视频监控系统的数据采集问题,本系统采用了视频专用解码A/D芯片和复杂可编程逻辑器件CPLD进行控制和接口设计,有效地实现视频信号的采集与读取的高速并行性,提高了电路的可靠性高,简化了电路设计过程,使整个系统的设计增加柔韧性.     

振动状态监控系统的硬件平台与软件设计

本文研究了基于数据采集卡的虚拟仪器技术,建立了振动状态监控系统.该系统硬件平台由传感器、电荷放大器、数据采集卡及计算机组成.系统软件程序由图形化编程语言LabVIEW编制,并按模块化设计,保证了良好的独立性和集成性.重点完成了系统设置模块、数据采集存储模块、数据分析模块的设计.     

一种基于以太网的嵌入式数字监控系统

本文根据监控系统的发展现状,提出了一个基于以太网的嵌入式数字家庭监控系统的设计方案,并初步比较完整的完成了该监控系统的开发.系统采用嵌入式现场监控器进行数据采集,现场监控器由数据采集卡和网络通讯卡组成,现场控制卡负责接收监控中心发出的控制命令,它们都是由一块51单片机控制,其软件开发都是使用了C51和51汇编程序.     

基于单片机和CPLD的高精度数据采集系统设计

本文提出了一种基于CPLD与MCU的多路高速数据采集系统的新方法.该系统利用AD7656和AD7864可以实现多通道同步采样或多通道异步采样,其中CPLD完成对AID转换的逻辑控制,使用MCU对AID转换数据进行处理.通过实际测试结果表明,所设计的基于CPLD与MCU的多通道数据采集系统,能够准确有效地进行AID数据采集.     

基于CPLD的图像采集存储模块的设计

基于嵌入式系统中对图像实时采集的需要,提出了一种利用复杂可编程逻辑器件CPLD来设计DSP图像压缩系统中数据采集存储模块的方案,重点讨论了CPLD在数据采集过程中的工作流程和控制方法。全文详细分析了CPLD输入输出信号的逻辑控制时序关系,分别就模拟I2C总线、数据采集的逻辑功能设计、CPLD逻辑功能仿真验证等进行了详细介绍。     

基于DSP的视频采集系统设计

为了解决基于DSP视频监控系统的数据采集问题,本系统采用了视频专用解码A/D芯片和复杂可编程逻辑器件CPLD进行控制和接口设计,有效地实现视频信号的采集与读取的高速并行性,提高了电路的可靠性高,简化了电路设计过程,使整个系统的设计增加柔韧性。     

基于PCI数据采集卡的高速多通道数据采集系统

针对数据采集系统设计要求具有精度高、速度快、路数多的特点,根据成本要求,采用DAQ-2010数据采集卡和CPLD等硬件完成了测试系统的搭建工作,介绍了系统的工作原理和开发思路,描述了系统软件的开发和功能。在实际应用中整个系统稳定可靠,取得了良好效果。     

Effective solution of certain problems of theory of schedulings of nets

Cybernetics and Systems Analysis -     

变电站一次设备喷涂PRTV用量的分析

对国网宁夏电力检修公司宁安运维站近2年来一次设备喷涂PRTV用量的统计数据进行分析整理,得出各类一次设备按照标准要求喷涂PRTV时的用量估算值,并针对现存作业中存在的问题,提出相应解决方案。     

Complexity of families of learning algorithms and estimation of the nonrandomness of extraction of empirical regularities

The paper presents a general approach to the evaluation of the complexity of classes of algorithms, so-called pVCD-method. To develop this method, all the examined families of models of empiric generalization were restricted to classes implementable on computers and, wider, by examining their partially recursive representations. Within the framework of the algorithmic approach, the concept of Kolmogorov’ complexity of algorithms for the recognition of properties or the extraction of regularities is proposed. The method proposed to evaluate the nonrandomness of the extraction of empirical regularities is based on this concept.     

Analysis of microdensitometric data in terms of probability of cleavage of DNA

Computer-aided analysis of autoradiographic films of DNA fragments is presented. The Powell least-squares procedure is used for optimization of parameters for components of complex densitometric curves. Since each densitometric spectrum may be divided for several non-overlapped blocks of bands, there is no upper limit on the number of parameters which must be optimized. Eight shapes for the component bands are utilized: symmetric and asymmetric Gauss and Cauchy functions, direct, symmetric and asymmetric product of Gauss function and inverse of Cauchy function, and log-normal function. The probability of DNA cleavage is calculated with correction for multiple cuts. The methods presented was applied to detailed analysis of densitometric spectra of a 21-bp DNA restriction fragment and allowed for direct correlation between structural microheterogeneity of DNA and the resulting cutting pattern. This method should facilitate the analysis of densitometric data from antibiotic-induced cleavage of DNA and footprinting experiments.     

联合收割机脱粒滚筒恒速智能控制器设计

研究了轴流式联合收割机的控制问题,给出了联合收割机脱粒滚筒的数学模型,介绍了基于模式识别的智能控制原理,建立了联合收割机脱粒滚筒恒速控制模型,设计了基于模式识别的智能恒速控制器.应用Matlab/Simulink进行了控制器仿真,其结果表明,将基于模式识别的智能控制应用于联合收割机脱粒滚筒的恒速控制,其过渡过程平稳、响应速度快、无超调、无振荡并且无稳态误差.     

An estimate of numbers of terms of semicycles of delay difference equations

In this paper, we study the semicycles of oscillatory solutions of the delay difference equation y_n+1 − y_n + p_ny_n-k = 0, where p_n is a sequence of nonnegative real numbers and k is a positive integer. Upper bound of numbers of terms of semicycles are determined in the case when

Our results improve and complement known results in literature.     

Complexity of approximation of 3-edge-coloring of graphs

The problem to find a 4-edge-coloring of a 3-regular graph is solvable in polynomial time but an analogous problem for 3-edge-coloring is NP-hard. To make the gap more precise, we study complexity of approximation algorithms for invariants measuring how far is a 3-regular graph from having a 3-edge-coloring. We show that it is an NP-hard problem to approximate such invariants with an error O(n1−ε), where n denotes the order of the graph and 0<ε<1 is a constant.     

Modifications of the method of variation of parameters

In spite of being a classical method for solving differential equations, the method of variation of parameters continues having a great interest in theoretical and practical applications, as in astrodynamics. In this paper we analyse this method providing some modifications and generalised theoretical results. Finally, we present an application to the determination of the ephemeris of an artificial satellite, showing the benefits of the method of variation of parameters for this kind of problems.