Distributed Store-and-Forward Deadlock Detection and Resolution Algorithms

Distributed algorithms for the detection and resolution of deadlocks in store-and-forward computer communication networks are presented and validated. The algorithms use a fixed amount of storage at each node (that is independent of the size of the network). The detection algorithm is simple but requires network-wide coordination. The resolution algorithm is based on earlier approaches, but uses the network-wide coordination to address certain synchronization problems. When the detection and resolution algorithms are merged, it is guaranteed that packets will arrive at their destinations in finite time.     

基于消息的分布式仿真技术

文中介绍了一种基于消息的分布信息处理系统仿真技术,重点讨论了仿真框架的体系结构、仿真代理和仿真运行的决策控制。该仿真机制采用规范化的消息实现时间和事件同步,协调整个系统的仿真运行,仿真运行过程中仿真单元间流转的信息是真实的,十分适于做复杂大型信息处理系统的分析研究平台。     

F—PORT传真存储转发系统

本文介绍了日本ＫＤＤ公司的Ｆ－ＰＯＲＴ传真存储转发系统的构成、工作方式及其功能。     

分布式控制系统的实时通讯规约

本文讨论分布式控制系统的实时通讯，并介绍作者设计和实现的一个用于分布式控制系统实时通讯的通讯规约及其工作方式     

集散控制火灾 报警控制系统

探讨了国内目前火灾自动报警系统中存在的问题,提出应用集散控制理论,构成新一代火灾自动报警控制系统.     

Channel Coding Scheme for 5G Mobile Communication System for Short Length Message Transmission

Wireless Personal Communications - Some channel coding schemes for 5G mobile communication system is facing difficulty in satisfying the user requirements in machine-type communication. This paper...     

浅谈现场总线控制系统与集散控制系统

首先对现炀总线控制系统及集散控制系统进行了简要的介绍，而后着重讨论了现场总线控制系统在实际应用中的一些问题，最后提出了工程应用中选择现场总线控制系统的一些建议．     

Dynamic Flow Control in Store-and-Forward Computer Networks

In a recent paper we presented an analysis of flow control in store-and-forward computer communication networks using a token mechanism. The analysis assumed equilibrium conditions for a selected set of system parameters which were not dynamically adjusted to stochastic fluctuations in the system load; this mechanism was referred to as "static flow control." In this paper we study a "dynamic flow control" in which parameters of the system are dynamically adjusted to match the availability of resources in the network. Based on Markov decision theory, an optimal policy to dynamically select the number of tokens is formulated. Because an exact solution to the problem is extremely difficult, an effective heuristic solution to the problem is presented. Numerical results are given and it is shown that the throughput-delay performance of a network is better with dynamic control than with static control.     

集散控制系统与现场总线控制系统

简要回顾了自动化控制系统的主要发展阶段，对集散控制系统特别是现场总线控制系统的定义、特点、系统结构等进行了比较详细的分析，介绍了几种主要的现场总线，并展望了集散控制系统和现场总线控制系统的发展趋势。     

Distributed Control in a Key Telephone System

This paper describes the distributed microprocessor architecture used in the Electra IMS digital communication system. The system has been in service in the U.S. as of 1985. The system's maximum line size is 160, its maximum trunk size is 80, and it can accommodate both normal single-line telephones and proprietary digital telephones. Data switching can also be performed because of the PCM/ TDM architecture. The distributed architecture is composed of a system control (SCU) and six module control units (MCU), each MCU handles 32 ports of peripheral equipment.bulletThe SCU and MCU's have a simplified common OS designed to handle the basic call processes.bulletThe SCU executes line-state control, time-slot control, and systemfeature application.bulletThe MCU executes peripheral-operation control and peripheral-status control. Software architecture is divided into small modules which represent each system function at the SCU, or each operating sequence at the MCU, so that addition or deletion of system features is very easy to implement. Hand-shaking belwccn the SCU and MCU's is controlled using a "message" which consists of several words. This architecture enables a nonsquare key telephone configuration, the building-block concept, and future system enhancement.     

面向亮室对比度测量应用的高精度可变环境照明条件控制系统设计

针对目前显示器的亮室对比度性能测试方法中照明条件设置难度大及可调整性差等问题,提出了一种采用积分球和大功率彩色LED的可变环境照明条件控制系统.大功率LED采用WRGB四种颜色,其中白光作为主光源提供照度,其他3种有色光源主要用来对模拟照明环境的相关色温进行修正,这4种LED通过一定比例混合,可在积分球内部形成指定照度和相关色温值的均匀漫反射光照条件,以此来模拟实际的环境照明条件.经过实验验证,本系统模拟光照条件照度的相对误差可控制在5％以内,相关色温的相列误差可控制在1％以内.     

Low-Power Non-Binary LDPC Decoder Design via Adaptive Message Length Control Exploiting Domain-Specific Information

Journal of Signal Processing Systems - With the enhanced performance and convergence speed than their binary counterparts, NB-LDPC codes have been considered for emerging wireless communication and...     

集散控制系统中的高阶管理

论述了集散控制系统在厂矿企业生产调度，监测管理上的应用，图示了系统结构，软件的功能和设计方法。     

分布式控制系统一致性控制方法研究

针对大型分布式控制系统在控制过程中由于节点信号冲突,造成控制延迟,不同步的问题.提出一种带非线性耦合的控制一致性算法,通过节点通信模型对不同模块之间通信进行一致性计算.运用关联决策理论对通信结果进行预估计,在通信出现延时的状态下,可以保证通信信号的一致性.使得多系统能够在延时允许的误差内进行通信.有效解决通信过程中出现的延迟、和信号不一致问题.实验表明,带非线性藕合的一致性算法,使得群体中的所有个体可以达到一个预先指定的值.解决带非线性耦合的一致性问题,取得了不错的结果.     

小型集散变频调速系统中的串行通信

以实际应用的小型集散变频调速控制系统为例，介绍了一种ＰＣ机与多ＡＴ８９Ｃ２０５１单片机之间串行通信的接口电路，并提出一种新的通信方法，即采用ＱＢＡＳＩＣ语言提供的通信语句来编写多机通信程序，对所接收的信息采用回送比较法，无需区分“地址帧”和“数据帧”，将其作为一个字符串一起发送。该方法硬件紧凑，软件编程简单、可靠。     

Algorithm for Construction of Variable Length Code with Limited Maximum Word Length

As a high efficiency coding method for TV signals, variable length coding, such as Huffman coding, is extremely effective. However, when this variable length coding is applied to an actual TV codec which requires high-speed real-time processing, maximum word length will be limited for the hardware configuration. This correspondence describes an algorithm for the construction of a modified Huffman code with limited maximum word length by means of a "top-down" procedure meeting this requirement instead of the conventional "bottom-up" algorithm.     

短消息泵统未来网络建设趋势

论述了短消息在国内外的发展现状及短消息的服务功能,分析了中国移动的”移动梦网"计划,并阐述了短消息系统网络的发展趋势和前景.     

Variable Length Optical Packet Synchronizer

Synchronization of asynchronously arriving variable length Internet Protocol packets to a local clock is demonstrated using a fiber-based optical synchronizer. The synchronizer is a four-stage feed-forward design with a resolution of 853 ps and a dynamic tuning range of 12.8 ns. The arrival time of packets is determined on a per packet basis using a payload envelope detection technique. The synchronizer state is dynamically configured on a per packet basis determined from the arrival time. Layer-1 (bit-error-rate) measurements are presented with power penalties 0.5 dB and an input power dynamic range 15 dB. Layer-2 (packet recovery) measurements are presented with power penalties 1.5 dB.     

变窗长自适应算法

基于快速横向滤波器结构，本文提出一种可变窗长自适应算法，该算法比滑动窗协方差算法具有更强的跟踪时变环境的能力。