Distributed Fault Estimation for Nonlinear Systems With Sensor Saturation and Deception Attacks Using Stochastic Communication Protocols

This paper is aimed at the distributed fault estimation issue associated with the potential loss of actuator efficiency for a type of discrete-time nonlinear systems with sensor saturation.For the distributed estimation structure under consideration,an estimation center is not necessary,and the estimator derives its information from itself and neighboring nodes,which fuses the state vector and the measurement vector.In an effort to cut down data conflicts in communication networks,the stochastic communication protocol(SCP)is employed so that the output signals from sensors can be selected.Additionally,a recursive security estimator scheme is created since attackers randomly inject malicious signals into the selected data.On this basis,sufficient conditions for a fault estimator with less conservatism are presented which ensure an upper bound of the estimation error covariance and the mean-square exponential boundedness of the estimating error.Finally,a numerical example is used to show the reliability and effectiveness of the considered distributed estimation algorithm.

Research and Design on Remote Meter Reading System based on PLC Technology

With the deepened transformation of China＇s power system, the stability and reliability of power utilization have been dramatically improved, but meter reading data acquisition does not keep pace with the times. With the continuous maturity of low-voltage power line communication （PLC）, this leads us to see hopes of using PLC technology to realize remote meter reading. In this paper, based on current PLC technology and combining domestic and foreign successful cases, a beneficial exploration and research is conducted from the composition and establishment of software and the design of software and protocol.

基于PLC的10kV配电网管理系统

介绍了一种基于电力线通信的配电网管理系统。该系统利用10 kV电力线作为传输介质实现了监控中心与配电监测终端之间的通信,具有实时性强、可靠性高和运行费用低等特点。分析了配电网管理系统的总体设计方案并描述了作为配电网管理系统关键部分的PLC通信单元的构成和关键技术、通信协议的制定以及监测终端的硬件构成。该系统可以在监控中心实现对本地设备的远程实时监测和管理。

西门子S7-200型PLC在分布式系统中的应用

结合西门子S7－200型PLC的特点，从通信协议和逻辑功能的实现两个方面，介绍PLC在电力监控分布式系统中的应用。

UAV-Assisted FSO Communication System with Amplify-and-Forward Protocol under AOA Fluctuations:A Performance Analysis

Free space optical(FSO)communication has recently aroused great interest in academia due to its unique features,such as large transmission band,high data rates,and strong anti-electromagnetic interference.With the aim of evaluating the performance of an FSO communication system and extending the line-of-sight transmission distance,we propose an unmanned aerial vehicle(UAV)-assisted dual-hop FSO communication system equipped with amplifyand-forward protocol at the relay node.Specifically,we consider impairments of atmospheric absorption,pointing errors,atmospheric turbulence,and link interruptions due to angle-of-arrival fluctuations in the relay system.The Gamma-Gamma and Malaga distributions are used to model the influence of atmospheric turbulence on the source-to-UAV and UAVto-destination links,respectively.We derive closedform expressions of the probability density function(PDF)and cumulative distribution function(CDF)for the proposed communication system,in terms of the Meijer-G function.Based on the precise PDF and CDF,analytical expressions for the outage probability,average bit error rate,and ergodic capacity are proposed with the aid of the extended generalized bivariate Fox’s H function.Finally,we show that there is a match between the analytical results and numerical results,and we analyze the influence of the system and channel parameters on the performance.

基于欧姆龙PLC的铁矿采选厂分布式控制系统

本文通过某大型铁矿采选厂分布式控制系统(DCS)的设计目标和设计方案,主要论述PLC现场总线网与工控机间基于Controller Link网络的链接技术,包括OMRON a系列PLC与CPMIA PLC间的通信协议宏功能,以及调试和运行时的有关问题及解决办法。系统投运以来,工作可靠,效益显著。

Manufacturing Communication: DCOM-MMS-based Approach for Flexible Manufacturing System

A design approach of manufacturing communication is presented for flexible manufacturing system in this paper. The primary objective aims at making the flexible manufacturing control system provided with interoperability and reconfigurability. Based on describing manufacturing message specification (MMS) and distributed component object model (DCOM), a client/server manufacturing communication model is built with MMS standard and DCOM middleware, and the communication interfaces between MMS client and MMS server are designed with Microsoft interface definition language (MIDL) and abstract syntax notation one (ASN.1) of MMS services. As a result, DCOM and MMS integration leads to such client/ server communication capabilities independent of different operating systems and manufacturing devices in flexible manufacturing automation environment. Finally, to verify the new design approach, a prototype system of robot control system has been implemented in MS 2000 Server/Professional Operating System and VC++ 6.0 Developer Environments.

Design and Implementation of Distributed Numerical Control in Flexible Manufacturing System

To monitor, control and manage the work process of computer numerical control machine tools in a flexible manufacturing system (FMS) effectively, the distributed numerical coutrol (distributed-NC) software should be innovated with the characteristics of modularization and reconfiguration. In this paper, firstly, distributed-NC functions in the FMS environment are described. Then, we present a design and development method of the real time distributed-NC that is on the basis of the re-coufigurable software and hardware platform and with an object-oriented model concept. Finally, to verify the proposed method, the distributed-NC software has been implemented in VC++ 6.0 and has been tested in connection with the different physical flexible manufacturing shops.

Three Projects of Intelligent Distribution Automation System in East Asia

Intelligent distribution automation system （IDAS） was developed based on distribution automation system that was installed in all distribution offices of Korea. IDAS was designed the combined system with the function of supervisory control and data acquisition （SCADA） and distribution automation system （DAS） for network operation from substation to high voltage customer, and it has been installed in Vietnam, China and Indonesia. This paper explains the project scope, system configuration, and the function of each sy stem.

Key Distribution Protocols for Mobile Communication Systems

In this paper we propose a new key distribution protocol for mobile communication systems.This protocol KDP4, like KDP3 in [3], is still secure against Simmons' replay attack and the new attack in [3] without using timestamps. It is a secure, efficient and practical key distribution protocol for mobile communication systems.

基于Profibus总线技术的智能配电柜系统的设计与实现

以某高校综合楼智能配电控制系统的设计为例,提出一种基于Profibus总线技术的智能配电柜系统,在分析系统的构架与特点的基础上,给出了以PLC为核心的主站方案及从站软件流程图和投入运行后的监控界面图。该系统使得设备控制的集中化、智能化得到了实现,具有良好的可扩充性。

A Dual Detection Method for Siemens Inverter Motor Modbus RTU Attack

Since the Modbus RTU wired communication protocol of Siemens variable frequency motors is unstable and lacks a protection mechanism, there is a risk of user information leakage. Aiming at the problems of insufficient flexibility of traditional defense methods and poor defense effects, The present work proposed a new dual detection method based on MODBUS RTU, which combines the dual monitoring mechanism of “Address Resolution Protocol (ARP) request detection” and “ARP response detection”. In order to improve detection efficiency, two real-time updated linear tables are introduced, which can effectively deal with the three ARP spoofing methods of updating the ARP buffer. Based on the analysis of the hidden dangers of the Modbus RTU wired communication protocol, a wired connection between the S7-1200 PLC and the variable frequency motor was established, and a real experimental platform was constructed to demonstrate the attack. The intensity of ARP attacks has gradually increased over time. Through comparative experiments with traditional defense methods, it is proved that the algorithm enhances the protocol mechanism in principle, and is more flexible and reliable than traditional methods.

动力锅炉双碱法脱硫系统DCS设计

双碱法脱硫是目前世界上应用最多的烟气脱硫工艺。本设计以双碱法脱硫理论为基础,采用西门子S7-300PLC为控制核心,上位机通过MPI通信协议与PLC通信并重点对脱硫塔PH值,碱罐液位,循环泵压力,进水口流量等现场信号进行集散在线监测与控制。

可编程序控制器发展趋势概述

对可编程序控制器在调查、分析和研究的基础上，提出其发展趋势是与PC机融合、将形成新一代性能更优越的可编程序控制器。

Integration of Manufacturing Services into Virtual Environments over the Internet

Virtual reality (VR) is a rapidly developing technology that has a wide spectrum of industrial and commercial applications. Networked (distributed or shared) virtual environments (VE) are of growing interest to modern manufacturing industry; a dominating use of networked virtual manufacturing environments (VMEs) is on-line visualisation and collaborative control of 3D information. This has to be supported by real-time data transfer. To meet a broad range of common requirements for Internet-based VE communications, particularly for virtual manufacturing and collaborative design and control, this paper presents a networked virtual environment system that is designed to support networked virtual design and manufacturing. The system is implemented with manufacturing message specification (MMS) standards so as to integrate a range of manufacturing services into networked VEs over the Internet.

Design and Implementation of a Wearable Body Area Sensor Network for Distributed FES System

A wearable body area sensor network(WBASN) was designed and implemented to monitor movement information of stroke patients in real time. The sensor system was combined with a previously developed distributed functional electrical stimulation(d FES) system, which is a promising technology for motor rehabilitation of stroke patients. Movement information could be useful in outcome assessment of rehabilitation, or for closed-loop adaptive stimulation during rehabilitation. In addition,a short-latency, low-power communication protocol was developed to meet the clinical requirements of energy efficiency and high rate of data feed-through. The prototype of the WBASN was tested in preliminary human experiments. Experimental results demonstrate the feasibility of the proposed wearable body area sensor network in monitoring arm movements on healthy subjects.

Quantum Key Distribution Network Based on Differential Phase Shift

Using a series of quantum correlated photon pairs, we propose a theoretical scheme for any-to-any multi-user quantum key distribution network based on differential phase shift. The differential phase shift and the different detection time slots ensure the security of our scheme against eavesdropping. We discuss the security under the intercept-resend attack and the source replacement attack.

Fully Distributed State Estimation for Power System with Information Propagation Algorithm

In this paper,a new fully distributed state estimation(DSE)based on weighted least square(WLS)method and graph theory is proposed for power system.The proposed method is fully distributed so that the centralized facilities,e.g.,supervisory control and data acquisition(SCADA)and centralized estimators,are not required.Also,different from the existing DSE methods,the proposed method is a bus-level DSE method,in which the power system is not required to be partitioned into several areas.In order to realize the proposed fully distributed DSE method,a novel information propagation algorithm is developed in this paper.This algorithm has great potential in future applications since it is useful to broadcast the local information of the nodes to the entire system in a fully distributed network.The proposed DSE method is compared with the conventional centralized state estimation method and existing multi-area DSE method in different models in this paper.The results show that the proposed method has better performance than the traditional methods.

Modbus通信协议在分布式控制系统中的应用

文就一种DCS与PLC作为上下位机的分布式控制系统,介绍基于Modbus协议的通信网络在其中的应用,以及该网络的硬件构成及程序设计。

Multiparty Quantum Secret Report

A multiparty quantum secret report scheme is proposed with quantum encryption. The boss Alice and her M agents first share a sequence of （M ＋ 1）-particle Greenberger-Horne-Zeilinger （GHZ） states that only Alice knows which state each （M ＋ 1）-particle quantum system is in. Each agent exploits a controlled-not （CNot） gate to encrypt the travelling particle by using the particle in the GHZ state as the control qubit. The boss Alice decrypts the travelling particle with a CNot gate after performing a aσ∞ operation on her particle in the GHZ state or not. After the GHZ states （the quantum key） are used up, the parties check whether there is a vicious eavesdropper, say Eve, monitoring the quantum line, by picking out some samples from the GHZ states shared and measuring them with two measuring bases. After confirming the security of the quantum key, they use the remaining GHZ states repeatedly for the next round of quantum communication. This scheme has the advantage of high intrinsic efficiency for the qubits and total efficiency.