Excel在工业控制数据处理中的应用

工业控制的计算机程序中经常要对大量的控制数据进行输入或修改。本文介绍通过利用Exce]这个大家熟悉的电子表格软件，使我们能方便、简单、快速地完成这些数据的编辑和输入，并转换为相应的字节以便进行传送或存储。     

一种面向SDN域内控制平面可扩展性的机制

目前互联网中网络设备的体系结构是封闭的,不利于网络创新.软件定义的网络(SDN)对互联网垂直紧耦合的结构进行了解耦,同时将控制层面及其协议的实现开放.SDN促进互联网创新和快速演进的思想已被学术界和工业界广泛接受.OpenFlow作为SDN的代表性实例,已被全球多所大学和研究机构部署.但OpenFlow域内集中控制的模式,随着部署规模的增大,控制平面的可扩展性越来越明显.为此本文采用了负载均衡的思想解决该可扩展性问题.提出了一种高度可扩展的架构MSDN.MSDN首先对数据流初始化请求进行分流,然后通过共享的整个网络视图对请求并行处理,并对网络视图进行了数据集群,从而彻底解决了控制平面的可扩展性问题.文章最后的实验模拟证明了方案的可行性.     

基于反馈控制理论的流媒体服务器资源管理模型

如何合理地分配系统资源，使流媒体服务器能够在满足客户基本QoS的前提下，支持尽可能多的并发服务，是流媒体研究领域的重要组成部分．提出了基于反馈控制理论的流媒体服务器资源调度模型及核心调度算法．该模型通过周期地采集系统的工作状态，并以此为根据调整任务在下一个采样周期内的运行属性，达到在满足任务的QoS的前提下，提高系统的并发程度的目的．详细分析了模型结构和核心算法的实现机制，并利用模拟平台对该算法进行了性能分析．     

DSMAC:一种适于无线多媒体传感器网络的信道接入协议

多媒体传感器网络作为一种多媒体信息获取和处理方式,已在军事、民用及商业领域中显示出广阔的应用前景.信道接入协议能否高效地使用无线信道是保证无线多媒体传感器网络通信的最关键的因素之一.分析支持多媒体业务传输的无线传感器网络信道接入协议的要求,提出适于多媒体传感器网络提供区分服务的信道接入协议--DSMAC(different service medium access control),对实时业务与非实时业务实现了区分服务,在信道接入帧内的随机竞争期实现突发业务及时接入,支持突发多媒体业务实时传输,并提出了多信道簇间传输方式,避免了隐终端冲突.最后,对协议的服务区分、实时性、吞吐量以及能量有效性等性能进行了仿真实验,验证了其优良性能.     

实时多任务过程控制机软件设计

本文从实用角度论述了一种可用于分布式系统和用户控制任务相对独立环境的实时多任务过程控制软件的整体设计思想、软件结构和实现的一般方法。文中还分别给出了两级系统监控级和过程控制级软件的实例。     

QoS Control Strategies for High-Quality Video Processing

Video processing in software is often characterized by highly fluctuating, content-dependent processing times, and a limited tolerance for deadline misses. We present an approach that allows close-to-average-case resource allocation to a single video processing task, based on asynchronous, scalable processing, and QoS adaptation. The QoS adaptation balances different QoS parameters that can be tuned, based on user-perception experiments: picture quality, deadline misses, and quality changes. We model the balancing problem as a discrete stochastic decision problem, and propose two solution strategies, based on a Markov decision process and reinforcement learning, respectively. We enhance both strategies with a compensation for structural (non-stochastic) load fluctuations. Finally, we validate our approach by means of simulation experiments, and conclude that both enhanced strategies perform close to the theoretical optimum.Clemens Wüst received the M.Sc. degree in mathematics with honors from the University of Groningen, The Netherlands. Since then, he has been with the Philips Research Laboratories in Eindhoven, The Netherlands, where he has been working mainly on QoS for resource-constrained real-time systems using stochastic optimization techniques. Currently, he is pursuing a Ph.D. degree at the Technische Universiteit Eindhoven.Liesbeth Steffens received her M.Sc. from Utrecht University (NL) in 1972. She spent most of her professional life in Philips Research in Eindhoven. She contributed to the design of a real-time distributed operating system, a video-on-demand server, a DVD player, a set-top box, and a QoS-based Resource-Management framework for streaming video. Her current focus is on characterization of resource requirements, resource reservation, and system-on-chip infrastructure.Wim F. J. Verhaegh received the mathematical engineering degree with honors in 1990 from the Technische Universiteit Eindhoven, The Netherlands. Since then, he is with the Philips Research Laboratories in Eindhoven, The Netherlands. From 1990 until 1998, he has been a member of the department Digital VLSI, where he has been working on high-level synthesis of DSP systems for video applications, with the emphasis on scheduling problems and techniques. Based on this work, he received a Ph.D. degree in 1995 from the Technische Universiteit Eindhoven. Since 1998, he is working on various optimization aspects of multimedia systems, networks, and applications. On the one hand, this concerns application-level resource management and scheduling, for optimization of quality of service of multimedia systems. On the other hand, this concerns adaptive algorithms and machine learning algorithms for user interaction issues, such as content filtering and automatic playlist generation.Reinder J. Bril received a B.Sc. and a M.Sc. (both with honors) from the Department of Electrical Engineering of the University of Twente, and a Ph.D. from the Technische Universiteit Eindhoven (TU/e), The Netherlands. He started his professional career at the Delft University of technology in the Department of Electrical Engineering. From May 1985 till August 2004, he has been with Philips. He has worked in both Philips Research as well as Philips Business Units, on various topics, including fault-tolerance, formal specifications, and software architecture analysis, and in different application domains. The last five years, he worked at Philips Research Laboratories Eindhoven (PRLE), the Netherlands, in the area of Quality of Service (QoS) for consumer devices, with a focus on dynamic resource management in receivers in broadcast environments (such as digital TV-sets and set-top boxes). In September 2004, he made a transfer to the Technische Universiteit Eindhoven (TU/e), Department of Mathematics and Computer Science, Group System Architecture and Networking (SAN), i.e. back to the academic world, after 19 years in industry.Christian Hentschel received his Dr.-Ing. (Ph.D.) in 1989 and Dr.-Ing. habil. in 1996 at the University of Technology in Braunschweig, Germany. He worked on digital video signal processing with focus on quality improvement. In 1995, he joined Philips Research in Briarcliff Manor, USA, where he headed a research project on moiré analysis and suppression for CRT based displays. In 1997, he moved to Philips Research in Eindhoven, The Netherlands, leading a cluster for Programmable Video Architectures. Later he held a position of a Principal Scientist and coordinated a project on scalable media processing with dynamic resource control between different research laboratories. In 2003, he became a full professor at the Brandenburg University of Technology in Cottbus, Germany. Currently he chairs the department of Media Technology. He is a member of the Technical Committee of the International Conference on Consumer Electronics (IEEE) and a member of the FKTG in Germany.     

A Statistical Admission Control Scheme for Continuous Media Servers Using Caching

In continuous media servers, disk load can be reduced by using buffer cache. In order to utilize the saved disk bandwidth by caching, a continuous media server must employ an admission control scheme to decide whether a new client can be admitted for service without violating the requirements of clients already being serviced. A scheme providing deterministic QoS guarantees in servers using caching has already been proposed. Since, however, deterministic admission control is based on the worst case assumption, it causes the wastage of the system resources. If we can exactly predict the future available disk bandwidth, both high disk utilization and hiccup-free service are achievable. However, as the caching effect is not analytically determined, it is difficult to predict the disk load without substantial computation overhead. In this paper, we propose a statistical admission control scheme for continuous media servers where caching is used to reduce disk load. This scheme improves disk utilization and allows more streams to be serviced while maintaining near-deterministic service. The scheme, called Shortsighted Prediction Admission Control (SPAC), combines exact prediction through on-line simulation and statistical estimation using a probabilistic model of future disk load in order to reduce computation overhead. It thereby exploits the variation in disk load induced by VBR-encoded objects and the decrease in client load by caching. Through trace-driven simulations, it is demonstrated that the scheme provides near-deterministic QoS and keeps disk utilization high.     

Fundamentals of Implementing Real-Time Control Applications in Distributed Computer Systems

Automatic control applications are real-time systems which pose stringent requirements on precisely time-triggered synchronized actions and constant end-to-end delays in feedback loops which often constitute multi-rate systems. Motivated by the apparent gap between computer science and automatic control theory, a set of requirements for real-time implementation of control applications is given. A real-time behavioral model for control applications is then presented and exemplified. Important sources and characteristics of time-variations in distributed computer systems are investigated. This illuminates key execution strategies to ensure the required timing behavior. Implications on design and implementation and directions for further work are discussed.     

加权负载求导预测的流媒体接纳控制研究

随着流媒体服务要求的不断提高,网络应用对计算、存储资源的需求不断增长。未来一段时间服务器负载的变化情况,是保证QoS要考虑的一个重要问题。因此,对当前网络应用的系统负载分析预测十分有必要。文中以有典型软实时特点的流媒体应用为研究对象,在原有三种资源的基础上,加入了硬盘资源作为第四种考虑对象,提出了加权的负载求导预测法,并以之为基础实现了流媒体的实时接纳控制方法。实验结果表明,该方法预测误差较小,能在高负载的情况下确保较高的服务接纳率和较低的丢包率。     

实时数据库事务处理的并发控制策略

实时数据库系统不仅要求数据库的一致性,而且还要满足时间约束.在实时数据库系统中,紧迫性和时限是进行实时事务处理的两个重要特征.本文介绍基于这两个特征的并发控制策略.     

模糊控制在型砂质量控制中的应用研究

型砂紧实率控制是型砂质量控制的重要内容之一。本文就连续式混砂机水分控制进行了系统的研究。建立紧实率控制数学模型,进行基于经典控制理论和模糊控制理论的控制器设计,并对仿真结果做了比较研究。     

一种新的流媒体拥塞控制算法

提出一种新的拥塞控制算法(TCP MS).该算法更适用于流媒体应用,有更高的带宽利用率、公平性,传输速率也更平滑.不同于传统的利用丢包率和排队延迟来探测拥塞的TCP拥塞控制算法,该算法通过确认数据包的速率来探测拥塞,并在每一轮往返时间内及时调整窗口.该算法提供的拥塞窗口变化更准确,传输速率抖动更小.因此,提高了网络带宽的利用率以及传输速率的平滑性.最后,文章将TCP MS与典型的基于丢包率的TCP Reno算法和基于排队延迟的TCP Vegas算法在带宽利用率、速率抖动以及公平性等方面分别做了比较,仿真结果表明TCP MS是一种理想的流媒体拥塞控制算法.     

含扩散项不可靠生产系统最优生产控制的数值求解

针对含扩散项不可靠随机生产系统最优生产控制的优化命题, 采用数值解方法来求解该优化命题最优控制所满足的模态耦合的非线性偏微分HJB方程. 首先构造Markov链来近似生产系统状态演化, 并基于局部一致性原理, 把求解连续时间随机控制问题转化为求解离散时间的Markov决策过程问题, 然后采用数值迭代和策略迭代算法来实现最优控制数值求解过程. 文末仿真结果验证了该方法的正确性和有效性.     

先进控制技术在工业生产中的应用

先进控制技术在工业生产中的应用是信息化带动工业化的组成部分。文章列举应用实例说明先进控制技术在工业生产中的重要意义。     

分布式交互媒体的一种应用控制模型

讨论了分布式交互媒体的特性和各种应用控制模型,并提出了一种新的控制模型——混合式控制模型,该模型可以有效的减轻最大平均操作时延,减轻服务器负担和用户应用程序复杂度,提高扩展性。     

Quality control expert systems: a review of pertinent literature

Statistical quality control (SQC) is an effective tool that ensures quality products and services by means of control charts, the essence of SQC, and sampling plans. While the computation of sample statistics and the development of control charts are routine exercises, the interpretation of chart patterns, trends and the associated diagnosis of assignable causes requires expert knowledge. The present trend is to develop a quality control system and apply it throughout the company (company-wide quality control CWQC or total quality control - TQC). This frequently means involvement of non-quality personnel in QC teams. Additionally, many companies are faced with a shortage of experienced quality controllers and individuals who can train and educate others on statistical quality control techniques. Quality control expert systems (QCESs) are considered as one way to alleviate these difficulties. In recent years, quality control expert systems have attracted the attention of both quality researchers and practitioners. This paper reviews existing quality control expert systems and recommends a set of quality engineering techniques that should be used to form a knowledge base, the heart of an expert system.     

基于过程控制的软件质量保障平台设计

软件过程改进是近年来颇受关注的一个问题领域。本文在分析并提取软件开发过程的典型特征之后,介绍了一个基于过程控制的软件质量保障平台的设计结构。该平台以CMM为指导思想,支持管理者对项目开发进行计划、跟踪、协调、检查、控制等各项管理工作。     

复杂工业过程集成建模及其实时监控与调度

采用一种新的混合标识过程／变迁网模型一变计时过程／变迁网来描述复杂工业过程。该模型通过引入过程运行标志离散标识(逻辑变量)和过程运行剩余时间连续标识(时间变量)，有效解决了多工位多工况复杂工业过程底层子过程的集成建模问题、离散事件与连续状态和过程控制与生产控制之间的耦合衔接问题，以及离散事件实时监控、连续子过程实时调度与控制等问题。给出了其实时监控、实时调度与过程控制的最佳策略求解方法。     

医学信息工程专业毕业设计过程质量控制的研究

毕业设计是实践教学的重要环节,由于其教学进度涉及的时间跨度较长,且教学过程多数贯穿在学生实习、考研及就业准备过程中,加之异地化的指导和管理较为困难,若缺乏行之有效的监督极易发生质量问题.本文以医学信息工程专业的毕业设计为例,从毕业设计各阶段的过程质量控制具体措施,配合线上教学管理平台的质量监督体系来研究切实提高毕业设计...