The Number of Neighbors Needed for Connectivity of Wireless Networks

Wireless Networks - Unlike wired networks, wireless networks do not come with links. Rather, links have to be fashioned out of the ether by nodes choosing neighbors to connect to. Moreover the...     

Lower closure and existence theorems for optimal control problems with infinite horizon

Lower closure theorems are proved for optimal control problems governed by ordinary differential equations for which the interval of definition may be unbounded. One theorem assumes that Cesari's property (Q) holds. Two theorems are proved which do not require property (Q), but assume either a generalized Lipschitz condition or a bound on the controls in an appropriateL _p-space. An example shows that these hypotheses can hold without property (Q) holding.     

统计过程控制中的回归控制图技术

针对微电路生产中工艺条件的变化情况 ,首先采用最小二乘法建立回归方程 ,构成表征工艺参数变化规律的工艺模型 ,然后在此基础上建立了回归控制图 ,对工序的统计受控状态进行定量分析     

First-Order Necessary Conditions of Optimality for Strongly Monotone Nonlinear Control Problems

Necessary conditions for the optimality of a pair (y*, u*) with respect to the cost functional g(y) + h(u) subject to AyBu + f are given in terms of generalized gradients. Here, g is locally Lipschitz, h is convex, A is a maximal strongly monotone operator, and B is linear. Two examples of applications of our necessary conditions to nonlinear partial differential equations of elliptic type are presented.     

Statistical Measures for Ordinary Least Squares Using the αQ Algorithm

This paper shows how the dynamic program algorithm called the Q algorithm can be used as an alternative algorithm to produce the coefficients of a least squares problem. It shows also how the output of the algorithm can be used to calculate various statistical quantities needed to evaluate linear models. In particular, we show how to calculate standard statistical quantities like the coefficient of determination R², the t statistics, and the F statistics. These quantities serve as a measure of how well the model fits the data.     

A unified framework for pull control mechanisms in multi‐stage manufacturing systems

This paper presents a unified framework for pull production control mechanisms in multistage manufacturing systems. A pull production control mechanism in a multistage manufacturing system is a mechanism that coordinates the release of parts into each stage of the system with the arrival of customer demands for final products. Four basic pull production control mechanisms are presented: Base Stock, Kanban, Generalized Kanban, and Extended Kanban. It is argued that on top of any of these basic coordination mechanisms, a local mechanism to control the workinprocess in each stage may be superimposed. Several cases of basic stage coordination mechanisms with stage workinprocess control are presented, and several production control systems that have appeared in the literature are shown to be equivalent to some of these cases.     

Time-optimal control of a parabolic system with time lags given in the integral form

In this paper the time-optimal control problem for a distributedparabolic system in which time lags appear in the integral formboth in the state equation and in the boundary condition ispresented. The particular properties of the optimal controlare discussed.     

卫星地球站网络管理技术发展

描述了卫星地球站站控与网管系统的作用和现状。以计算机控制技术促进地球站远程监控和网络管理技术等方面发展,详细论述了设计与研发规范化建设的思路,并提出建设模式。自主研发与生产的网管系统将会得到大力发展。     

老虑边缘效应直线感应电机矢量控制系统仿真

考虑直线感应电机的动态纵向边缘效应，建立直线感应电机数学模型。利用Simul建立了矢量控制模型，对考虑与不考虑动态纵向边缘效应的仿真结果作了对比，结果证明了考虑边缘效应的正确性与有效性。     

基于PROFIBUS的6SE70变频器在连铸拉矫机中的应用

济钢第三炼钢厂1＃连铸机引进的是VAI（奥钢联）的板坯连铸机，为了实现对多达20台拉矫电机的控制，它用了负载分配控制技术。为实现负载分配技术，拉矫系统采用了基于PROFIBUS的西门予6SE70变频器构成的现场总线控制系统。本文介绍了该系统PROFIBUS硬件配置、软件编程和116SE70变频器通讯参数的设置.