复杂流程工业系统的优化综合与柔性分析

MINLP模型在优化综合与柔性分析中起着重要作用。具有两种表示方法：代数法和逻辑法,后者在模型表达与求解方面有很多优点。MINLP模型中还可以集成启发性知识,也就是工程经验,以加快求解速度,并使结果更加合理。对于凸的MINLP问题。目前比较成熟的算法有分支界定法、外近似法和广义Bender函数法。对于非凸NINLP问题,其求解算法目前尚在研究中,已提出的有罚函数法、αBB算法和符号重建算法。此外,一些基于随机搜索的方法也得到了应用,并且在实践中取得了较好的结果。     

复杂开放系统的集对界般仿真

任何系统都有界壳界门。界门控制问题是板子系统生存与发展的关键问题之一，本文综合运用了集封分析和界壳论知识来探讨复杂开放系统的界门开放控制问题，提出SPJ（Set Pair Jieke）控制仿真．并封经济系统界门控制进行了分析，给出了SPJ控制流程图和案例分析，     

工业液压系统节能控制优化

介绍国内某钢铁厂生产线液压控制系统的节能控制优化工作.     

复杂控制系统的开放控制平台

引言 复杂控制系统，例如飞行器、电力以及电信网络等系统的设计给控制系统工程师以极大的挑战，特别是军事应用中要求这些系统具有新的、高度复杂的性能，用传统的控制技术很难实现，主要包括以下几个方面： (1) 适应性/动态重配性 大型工程系统应该具有对系统的变化做出快速而良好响应的能力，这些变化包括环境的变化和不影响操作完整性情况下自身结构的变化。超级性能的动态系统必须能够支持算法组件的在线转换以及它们之间连接的快速重定向，并且能够改变信息流的优先级。这些性能对于混合控制系统来说非常重要。 (2) 即插即用可扩展…     

基于视觉的复杂工业生产过程智能控制系统

针对食品加工过程中质量控制这一动态范围宽、模型难以建立的过程,提出了一个基于视觉的面包加工过程智能控制系统。主要控制面包的形状、大小和颜色。内容包括参数检测、视觉系统、模型建立以及智能控制策略。利用图像处理技术分析面包的质量参数。采用统计及神经一模糊技术建立其数学模型,构成多级计算机智能控制系统。通过产品的图像信息实时准确地检测产品的质量,构成质量闭环控制。该系统已应用到面包加工生产厂,达到了设计要求。该系统控制效果明显,减轻了劳动强度,提高了产品质量,不仅适合面包加工过程．同时可以应用到其他寅杂工业生产过程的控制。     

Optimal Control of the Parabolic System and Identification of Its Parameters for the Known Heat Flows

We analyze the optimal control of the dynamic thermal state of a homogeneous layered plate (parabolic system) under simultaneous observation of its temperature and heat flow rate on its parts. We obtain explicit expressions for the gradients of residual functionals for simultaneous identification of several parameters of the system.     

开源视角下的精品课程管理系统(CMS)选择对策

作为优质教学资源的重要载体,精品课程网站的建设得到了课程教师和技术人员的高度关注。探讨了如何选择符合"开放教育资源"理念的高校精品课程管理系统。通过与商业模式开发的课程管理系统比较,表明开源的课程管理系统在系统架构、功能实现等方面符合高校精品课程网站建设与整合的要求,是现在乃至将来精品课程网站建设的一种重要选择途径。     

Spectral Element Methods for Transitional Flows in Complex Geometries

We describe the development and implementation of an efficient spectral element code for simulating transitional flows in complex three-dimensional domains. Critical to this effort is the use of geometrically nonconforming elements that allow localized refinement in regions of interest, coupled with a stabilized high-order time-split formulation of the semi-discrete Navier–Stokes equations. Simulations of transition in a model of an arteriovenous graft illustrate the potential of this approach in biomechanical applications.     

基于PC机的开放式交流伺服系统的研究

针对传统数控伺服技术形成的封闭系统,不同设备之间无法实现信息交换、不同的软件之间无法实现信息的传输、不同的数据库之间无法实现数据的共享等问题,提出了一种基于PC机的开放式交流伺服系统的设计方案,实现系统的扩展性和开放性.论证了设计开放式交流伺服系统的必要性和可行性,并介绍了具体的实现方法.系统PC机采用工业控制计算机,软件平台选用图形化编程语言LabVIEW,控制系统的参数优化采用适应性遗传算法(AGA).系统在生产实践中具有广阔的应用前景,既可以作为验证所编控制策略的实验平台,也可以作为完整的控制平台提供给用户使用.     

Time Optimal Software Pipelining of Loops with Control Flows

Software pipelining is widely used as a compiler optimization technique to achieve high performance in machines that exploit instruction-level parallelism. However, surprisingly, there have been few theoretical or empirical results on time optimal software pipelining of loops with control flows. In this paper, we present three new theoretical and practical contributions for this underinvestigated problem. First, we propose a necessary and sufficient condition for a loop with control flows to have an optimally software-pipelined program. We also present a decision procedure to compute the condition. As part of the formal treatment of software pipelining, we propose a new formalization of software pipelining. Second, we present two software pipelining algorithms. The first algorithm computes an optimal solution for every loop satisfying the condition, but may run in exponential time. The second algorithm computes optimal solutions efficiently for most (but not all) loops satisfying the condition. The former one proves the sufficiency of the condition and the latter one suggests a practical optimal software pipelining algorithm. Third, we present experimental results which strongly indicate that achieving the time optimality in the software-pipelined programs is a viable goal in practice with reasonable hardware support.     

开放的复杂巨系统Internet可存活性需求分析框架

传统的安全概念已不适应今天开放环境下的复杂信息系统。随着现代社会对Internet依赖性的增加,计算机网络系统的可存括性的需求成为亟待解决的问题。该文分析了Internet可存活性的重要性,提出了可存活性的需求框架,并使用HWMSE作为测试和评估网络系统可存活能力的方法,为提高巨型计算机网络的可存活性提供了有效的解决途径。     

Complex Optimal Control of a Thermally Stressed State of a Two-Component Body

New problems of optimal control for a thermally stressed state of a two-component solid body are considered in the paper. The body contains a thin and a weakly thermally penetrating inclusion. The existence of unique optimal controls is proved for every described case with quadratic cost functionals.     

网络环境下复杂系统的集成优化控制方法研究

本文将大系统的递阶DISOPE方法与网络自动化技术相结合,研究了网络环境下复杂系统的集成优化控制方法,对其关键技术和存在的问题进行了研究和探讨。     

网格计算中的开放复杂巨系统

在处理复杂巨系统问题时,本文利用对特定问题的求解策略,以网格技术作为支撑,有效地综合集成计算机网络中的各种资源,不仅能够对数据库、方法库等高层资源进行集成,而且可以将计算能力、存储能力、网络资源,甚至硬件设备和人都进行有效的集成,提供一个协作的、高效的、开放的网格巨系统.     

CAS理论视角下产业集群演化模型构建

针对产业集群的复杂自适应系统（Complex Adaptive System,CAS）特性,以CAS理论的个体行为模型和整体演化的ECHO模型为基础,并结合产业集群的概念特征建立产业集群系统构架。并在此基础上,提出产业集群系统动态演化模型。该模型把产业集群演化的生命周期特性和复杂系统的演化识别过程结合起来,以复杂系统的演化机制为依据,认为产业集群诞生于混沌经济环境,经过系统对环境的自适应学习,自身的分岔与突变,系统功能的整体涌现,达到系统暂态稳定,是一个螺旋上升的循环过程。产业集群系统演化的核心机制是以产业分工为主的自适应机制和以系统创新为主的分岔与突变机制。     

OPC-全开放控制系统的核心构件

OPC基金会规范了应用客户端交换信息的数据品格，各设备制造商由其OPC服务器（程序）按此规范要求与客户端交换信息，形成信息交换全开放的统一平台。局部集中控制＋以太网＋OPC有望成为无机柜化的FCS统一体系结构，使用OEM产品易于构成FCS的统一平台，FCS市场竞争将主要体现于应用软件的竞争，国内业界应致力于系统集成。     

Optimal Choice of Coordinates for Oil Well Drilling

Methods and algorithms for determining coordinates for drilling new wells on an admissible set are developed by extending approaches of [1]. The cases in which (1) time-changes in oil saturation can be neglected and (2) pressure and oil saturation distributions in time and space described by a common system of differential equations are studied separately. Special attention is paid to methods that involve the determination of optimal controls.     

Prices in a Shopbot Market

Shopbots are Internet agents that automatically search for information pertaining to price and quality goods and services. We study the impact on prices and price dispersion of such software agents. It is shown that price dispersion is a phenomenon which is independent of heterogeneity in E-tailers characteristics that is even if E-tailers provide the same service offerings, price dispersion remains whenever a captive market exists. Moreover, an increase in information does not reduce price dispersion but in general will increase it.     

Optimal Choice of AR and MA Parts in Autoregressive Moving Average Models

This paper deals with the Bayesian method of choosing the best model for a given one-dimensional series among a finite number of candidates belonging to autoregressive (AR), moving average (MA), ARMA, and other families. The series could be either a sequence of observations in time as in speech applications, or a sequence of pixel intensities of a two-dimensional image. The observation set is not restricted to be Gaussian. We first derive an optimum decision rule for assigning the given observation set to one of the candidate models so as to minimize the average probability of error in the decision. We also derive an optimal decision rule so as to minimize the average value of the loss function. Then we simplify the decision rule when the candidate models are different Gaussian ARMA models of different orders. We discuss the consistency of the optimal decision rule and compare it with the other decision rules in the literature for comparing dynamical models.     

Estimation of Stationary Loss Probability in a Queuing System with Recurrent Input Flows

A multiserver queuing system with recurrent input flows is considered. A fast simulation method is proposed for evaluation of stationary loss probability. It is based on the joint use of importance sampling and the central limit theorem. The estimates are asymptotically unbiased. Two examples demonstrate high accuracy of the estimates.