Variance-Constrained Filtering Fusion for Nonlinear Cyber-Physical Systems With the Denial-of-Service Attacks and Stochastic Communication Protocol

In this paper, a new filtering fusion problem is studied for nonlinear cyber-physical systems under error-variance constraints and denial-of-service attacks. To prevent data collision and reduce communication cost, the stochastic communication protocol is adopted in the sensor-to-filter channels to regulate the transmission order of sensors. Each sensor is allowed to enter the network according to the transmission priority decided by a set of independent and identically-distributed random variables. From the defenders’ view, the occurrence of the denial-of-service attack is governed by the randomly Bernoulli-distributed sequence. At the local filtering stage, a set of variance-constrained local filters are designed where the upper bounds (on the filtering error covariances) are first acquired and later minimized by appropriately designing filter parameters. At the fusion stage, all local estimates and error covariances are combined to develop a variance-constrained fusion estimator under the federated fusion rule. Furthermore, the performance of the fusion estimator is examined by studying the boundedness of the fused error covariance. A simulation example is finally presented to demonstrate the effectiveness of the proposed fusion estimator.      

在线可编程手持数据采集设备系统的层次化软件设计

介绍了ATMEL公司的高性能AVR单片机ATMega128L的在线可编程(ISP)的特性并在手持数据采集设备系统中实现了面向对象的应用软件和相关通讯软件、监控软件的层次化设计,扩大了手持式数据采集设备在工业控制计算机领域中的应用范围。     

列车火灾报警系统的设计与实现

介绍了列车火灾报警系统软硬件设计原理,采用预警和报警结合的方法,通过预警提高发现火灾隐患的灵敏度,通过进一步的报警检测提高抗干扰性;采用1线温度测量网测量温度与烟雾监测相结合的方法;利用原有供电线路设计的直流电源线载波通信方式以方便布线,采用了一系列减小功耗的措施以适应远距离传输。该系统结构简单、安装方便、检测灵敏度高,对设计楼宇火灾报警也具有实用参考价值。     

移动智能网中SCP的设计研究

给出了GSM（全球移动通信系统）和智能网结合的总体结构，指出了移动智能网中SCP（业务控制点）设计要解决的问题：（1）怎样与HLR（归属位置寄存器）进行通信以得到移动网中与移动有关的数据，（2）怎样解决智能业务与移动网中已有业务的交互．本文对这两个问题给出了解决办法．最后，为了让业务提供者设计与移动有关的业务，定义了三个与移动有关的新SIB（业务无关构件）     

Cellulolytic properties of Chaetomium crispatum

The cellulolytic properties of a Chaetomium crispatum strain were investigated. The cellulolytic enzyme complex i.e.: exo-1,4-β-glucosidase (EC 3.2.1.74); endo-1,4-β-glucanase (EC 3.2.1.4.) and β-glucosidase or cellobiase (EC 3.2.1.21) displayed optimal activity at pH 5.0 and 25°C. Although carboxymethyl-celluloses are the usual pseudo-substrates for this enzyme complex, those with a high degree of substitution gave rise to poor growth and low cellulase activity. Insoluble crude cellulosics such as newsprint, recycled paper, rice and flax straw were substantially solubilised at 28°C within 3–5 days of fermentation. A study of the cellulase-complex formation during the growth cycle revealed that β-glucosidase was produced mainly intracellularly in the early exponential phase, while the overall exo-1,4-β-glucosidase and endo-1,4-β-glucanase formation gradually increased during the total fermentation cycle. The mycelial protein of Chaetomium crispatum grown on crude cellulosics displayed a favourable amino acid pattern, indicating its potential value as a source of single cell protein (SCP).     

“开机提醒”业务两种主要实现方式及比较

本文对开机提醒业务SCP及信令采集两种主要实现方式进行了深入介绍,并对其实现方式的优缺点进行了全面的比较。     

Low grade thermal energy sources and uses from the process industry in the UK

Thermal energy loss in the process industry is a significant issue due to the high temperatures and multiple heat intensive processes involved. High-grade thermal energy is typically recovered within processes. However, lower grade heat is often rejected to the environment.The benefits of capturing and utilising low grade thermal energy are highly dependent on the qualities and properties of the heat in the waste streams. The temperature of the low grade heat stream is the most important parameter, as the effective use of the residual heat or the efficiency of energy recovery from the low grade heat sources will mainly depend on the temperature difference between the source and a suitable sink, e.g. another process or space heating/cooling. In general, the temperatures of these waste heat sources are too low to produce electricity and direct heat use will depend on whether potential user can be found.This paper presents past and current drivers for heat recovery studies. High and low grade heat sources are defined according to the viability of recovery within the processes. Firstly, high grade heat capture within the processes is reviewed. Then, the focus is on the potential for low grade heat capture outside of the original plant. The paper addresses the potential for low grade heat recovery with regard to new incentives and technological advances. Finally, different aspects which influence the decision making for low grade heat recovery in the process industry are discussed. It is concluded that organisational, financial and economic barriers might be overcome and benefits from a holistic vision could be gained with stronger governmental policy and regulation incentives.     

城市垃圾焚烧发电的控制策略

主要介绍了杭州绿能环保发电有限公司城市垃圾焚烧电厂控制系统的配置以及各个系统的控制策略,着重介绍了垃圾焚烧炉的控制策略,供类似自控设计参考.