基于时间序列模型的超声信号滤波算法研究

针对超声波测量油井液面深度系统中,现有降噪滤波算法复杂,效果差的缺点,提出了基于时间序列模型和新息卡尔曼滤波相结合的新方法。利用时间序列分析法对动液面测量系统建立ARMA模型;基于卡尔曼滤波实时在线消除随机噪声的特性,设计了新息自适应卡尔曼滤波算法,并结合ARIMA模型以消除模型误差,实现了基于时间序列系统模型对系统特征状态的最优估计目的。该新型滤波方法已经在油田现场测试和运用,测试结果表明,算法实时、高效,滤波效果好,精度高,能满足实际工程应用。     

基于短时能量与LSTM的油井动液面深度研究

油井动液面深度计算一直是油田行业关注的重要课题,高效、准确地获取井下液面的动态深度信息对石油行业发展至关重要。为此,针对油井动液面的深度测算受环境噪声的影响而导致计算误差较大的问题,研究基于声波法的油井动液面深度估计与预测算法。通过设计改进型短时能量过零函数和三电中心削波函数,以及融合多渠道液面位置估计信息,获得动态液面的深度估计算法;将此法获得的液面位置和平均声速作为LSTM神经网络的输入,以及实测液面深度作为期望输出,获得可预测液面深度的预测模型。比较性的实验结果表明,所获液面深度计算算法较之短时能量和短时能量过零函数法,更能有效测算动液面深度;得到的预测模型能有效预测不同时段声波下的液面深度。     

功图计量与工况智能分析技术在长庆油田的应用

本文从功图计量与工况智能分析技术的技术原理、有杆抽油系统数学模型的建立、泵功图的计算、有效冲程的识别及计算结果的修正五个方面对该技术进行了详细的阐述,重点介绍了功图计量与工况智能分析系统的构建及其拓展的功能,实现了生产数据的实时采集、产量自动计产、油井远程监控、油井故障诊断、动液面实时监测、系统效率实时监测、报表自动生成等功能,简化了流程,降低了投资、减少了用工总量,提高了油田数字化管理水平,为建设数字化油田,实现5000万吨目标提供技术支撑。     

油井动态液面测量系统设计与实现

为及时准确地测量油井液面深度,研制了以C8051F060为核心的油井动态液面测量系统,并配有键盘和液晶显示组成小型操作系统,可实现信号调理、数据采集、图形显示、键盘控制、数据计算及串口通信等功能。介绍了该系统的测量原理、动态液面深度计算及软硬件实现过程。实验证明该系统结构设计合理、使用安全,实验数据满足精度要求。     

动液面自动监测系统的研究与现场应用

油井动液面是反映地层供液情况的关键指标之一,也是制定油井生产制度的重要依据。同时,油井动液面的物联化数据采集与智能管理也作为智慧化油田建设工作的核心之一,是油田数字化转型、智能化发展的主要方向,因此,高效准确的动液面数据物联化采集尤为重要。目前,行业内普遍采用回声仪人工现场检测的方法,不仅数据采集周期长,耗费人力物力大,且数据的完整性及准确程度也无法保障。针对现有动液面监测系统存在的局限性,本项目研发推出了一款高精度测量、适应多种井况、结合物联网技术的动液面自动监测系统,并在国内某“三低”油田开展了现场试验,实现了动液面数据的精准采集、传输和计算,证明了该系统具有较高的技术应用和推广价值,为油田智慧化建设提供了支持,为油田安全生产、科学生产提供了保障。     

基于TD-LTE和LabVIEW的油井远程监控系统设计

针对目前油井远程监控系统的弊端,设计了一种基于TD-LTE(分时长期演进)高速数据传输技术和LabVIEW测量软件的油井远程监控系统.通过本系统能够快速有效地监控油井生产状况,还能够对历史数据进行查询和分析.经过模拟调试验证了系统对油井的悬绳拉力、油管压力、原油温度、抽油机电机电压电流等关键参数的实时监控,且能够对突发状况进行有效处置.     

基于PXI总线的飞机电气多通道分布式测试系统

设计了一种基于工业以太网和PXI总线技术的飞机电气参数多通道分布式测试系统,提供了软硬件设计方案,满足了现场以及远程多通道数据同时测量的要求,并实现了测试数据的实时采集和后期回放。     

基于VXI总线的飞机电气多通道分布式测试系统

设计了一种基于工业以太网和VXI总线技术的飞机电气参数多通道分布式测试系统,提供了软硬件设计方案,满足了现场以及远程多通道数据长时间同时测量的要求,并实现了数据的实时采集、后期回放及分析处理.     

DSP在动液面深度测试中的应用

本文主要介绍数字信号处理器及数字信号处理技术在动液面深度测试中的应用,并与传统实现方案进行比较。     

基于LabVIEW/WT3000的永磁电机参数实时测试系统

针对永磁电机实时运行过程中的特征参数测试需求,设计了基于虚拟仪器的永磁电机参数实时测试系统;分析了永磁电机定子磁链实时估计方法,探讨了影响磁链参数精度的定子绕组电阻测量值实时校正方法,设计了基于以太网实时数据传输的LabVIEW/WT3000高精度功率分析仪的数据采集系统,并通过实时采集的常规参数完成对定子磁链等特征参数的在线估计;该测试系统包含信号采集、数据处理、曲线拟合、图形化显示及数据存储等功能,具有测试功能丰富、人机界面自定义、易实现远程测试等特点;通过对额定电压为130V的30KW永磁同步电机的测试,验证了该系统良好的实用性和可扩展性。     

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.