PLC在电力拖动一体化中的应用探讨

随着科技的迅猛发展,PLC的相关技术一天比一天成熟,在人工智能、机械加工等领域得到了广泛的应用。为了更好的控制电机的运行状态,电力拖动控制线路的一体化就是很好的方法之一。将PLC加到电力拖动一体化中,可有效的控制好电机的运行状态,使电机和设备的运行状态可视化,如发现问题,可及时处理。本文简要的介绍了PLC和电力拖动一体化,分析了PLC如何在电力拖动一体化中应用。     

PLC在电气自动化中的应用研究

传统的电气自动化控制系统中往往需要安装比较复杂的线路，调试困难，维护也非常不方便，还需要消耗大量的工作量，同时还很难保证工作质量。所以，PLC这项结构灵活、运行安全可靠的技术便被引入到了电气自动化控制中来，并得到了广泛的应用。本文就PLC和电气自动化的概念和具体应用展开了探讨。     

基于PLC的电气工程自动化控制设计

科技水平的提升促进我国社会生产力的极大进步，社会生产力的发展又促进各个行业和产业的发展，我国的工业、制造业等产业实现技术上的极大更新。电气自动化控制技术的发展和应用已深入社会生产的方方面面，在当前的时代背景下，电气工程已和系统运行、自动控制、电力电子技术等方面的产业有紧密的联系，PLC技术的出现给电气工程自动化控制带来全新的活力，文章从PLC技术的内涵和实施原理入手，详细分析PLC技术具备的优势和特点，论述PLC技术的主体架构，并根据当前电气工程自动化控制设计的实际情况探讨将PLC技术应用于电气自动化控制的主体优势，并具体阐述PLC技术应用于电气工程自动化控制的主要方面。     

数控系统的软PLC系统开发

介绍了软PLC技术的发展状况、相关的概念和组成结构，并且把它和传统的硬PLC做了一些控制方案等方面的比较。提出了基于开放式数控系统上的软PLC系统，并对本系统中的控制方案、开发系统和运行系统做了较为详尽的介绍。软PLC系统在开放式数控系统RTLinux中应用稳定，并节约了成本。     

现代通信和控制技术在城市污水处理中的应用

针对城市污水处理厂工艺流程及其特点对自控系统的要求，介绍了现场总线技术、工业Ethemet通信技术和PLC控制系统等现代通信和控制技术在污水处理厂自控系统的应用。运行结果表明，提高了城市污水处理的自动化和管理水平。     

电力配电线路的节能降损技术研究

本文简要分析了电力配电线路的节能降耗技术。在电力配电线路节能降耗管控过程中,工作人员需灵活、高效地应用各项技术,以提高整个系统节能降耗的水平和效率。期间,工作人员可选用高效能的变压器设备,有效减少设备的损耗,同时也可引进电压调节技术维持整个系统的电压平衡;另外,在能源消耗管控过程中,也可采取功率因素改善策略控制整个系统的无功功率流动及有功功率,结合各种补偿装置,提高系统的综合运行水平。工作人员也可利用相应的智能监管及控制技术及时监测电力系统的负载状况以及在运行过程中的各项指标,适当借助能源储存管理技术,提高整个系统的综合运行水平和效率。     

基于PLC技术的电气控制技术研究

PLC特有的技术,就是控制器具有可编程特性。PLC这一新颖技术,涵盖了工业管控的应用微机、带有自动特性的控制技术以及是通用架构的控制器件等特征。工业范畴的电气控制,整合了一次及二次架构的控制回路。高低压配件特有的电气控制,整合了自动管控、后续的设备查验、惯常的电气测量。有必要明晰PLC特有的应用方式,化解技术范畴的应用弊病。     

基于PLC在自动化立体仓库控制系统中的优化设计

介绍了采用PLC、红外无线通讯技术、数据库技术和变频技术对自动化立体仓库进行控制系统的优化设计,不断改进和完善系统功能,使系统运行高效、快速、稳定、安全,方便.在仓库管理、行车运行、电梯控制等相似工业对象管控中具有一定的推广应用价值.     

基于PLC的自动铣床控制系统设计

随着PLC在控制领域和制造行业的得到广泛的应用,PLC控制也越来越为大家所熟悉知。通过PLC在在铣床加工方面的应用,可以有效提高加工精度和效率。作者针对铣床的工作流程,结合PLC的控制原理,将PLC技术运用到自动铣床控制系统中,PLC充分体现其控制的灵活性和可靠,为PLC更广泛的在生产实际运行提供了很好的参考。     

基于PROFIBUS总线的过程自动化控制系统设计与实现

针对传统过程自动化控制系统存在的线路繁杂、信号易干扰、系统稳定性差等问题,通过采用PROFIBUS总线技术,在以HDU3000实验装置基础上,结合PLC控制系统特点,设计并开发出现场总线过程控制系统。实践证明该系统能够安全、可靠、稳定地运行。     

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.