Research on reliability index of a large communication network with domain partition and interconnection

In order to indicate the performances of a large-scale communication network with domain partition and interconnection today, a kind of reliability index weighed by normalized capacity is defined. Based on the route rules of network with domain partition and interconnection, the interconnection indexes among the nodes within the domain and among the domains are given from several aspects. It is expatiated on that the index can thoroughly represent the effect on the reliability index of the objective factor and the subjective measures of the designer, which obeys the route rules of a network with domain partition and interconnection. It is discussed that the defined index is rational and compatible with the traditional index.

Control of Spatially Interconnected Systems with Random Communication Losses

This paper deals with analysis and synthesis problems of spatially interconnected systems where communicated information may get lost between subsystems. Spatial shift operator and temporal forward shift operator are introduced to model the interconnected systems as discrete time-space multidimensional linear systems with Markovian jumping parameters which reflect the state of communication channels. To ensure the whole system＇s well-posedness and mean square stability for a given packet loss rate, a condition is derived through analysis. Then a procedure of designing distributed dynamic output feedback controllers is proposed. The controllers have the same structure as the plants and are solved within the linear matrix inequality （LMI） framework. Finally, we apply these results to study the effect of communication losses on the multiple vehicle platoon control system, which further illustrates the effectiveness of the proposed model and method.

Short-Range Optical Wireless Communications for Indoor and Interconnects Applications

Optical wireless communications have been widely studied during the past decade in short-range applications, such as indoor highspeed wireless networks and interconnects in data centers and high-performance computing. In this paper, recent developments in high-speed short-range optical wireless communications are reviewed, including visible light communications （VLCs）, infrared indoor communication systems, and reconfigurable optical interconnects. The general architecture of indoor high-speed optical wireless communications is described, and the advantages and limitations of both visible and infrared based solutions are discussed. The concept of reconfigurable optical interconnects is presented, and key results are summarized. In addition, the challenges and potential future directions of short-range optical wireless communications are discussed.

Algorithm and Performance Analysis of Optical Multistage Interconnection Network

A sorting algorithm based on the Batcher' s algorithm is presented. An 8X8multistage interconnection network(MIN) is constructed. Applying wavelength division multiplexing(WDM) technology and integrating control mode, the designed network can realize non-blockingcommunication. The time delay of the MIN and the switches needed are also analyzed in theory, thededuced result conforms that the MIN designed previously is feasible. In the case of the samecommunication quality guaranteed, MIN uses the least switches and completes the communication moreefficiently.

Approach to Simplify the Development of IoT Systems that Interconnect Embedded Devices Using a Single Program

Many Internet of Things(IoT)systems are based on the intercommunication among different devices and centralized systems.Nowadays,there are several commercial and research platforms available to simplify the creation of such IoT systems.However,developing these systems can often be a tedious task.To address this challenge,a proposed solution involves the implementation of a unified program or script that encompasses the entire system,including IoT devices functionality.This approach is based on an abstraction,integrating the control of the devices in a single program through a programmable object.Subsequently,the proposal processes the unified script to generate the centralized system code and a controller for each device.By adopting this approach,developers will be able to create IoT systems with significantly reduced implementation costs,surpassing current platforms by more than 10%.The results demonstrate that the single program approach can significantly accelerate the development of IoT systems relying on device communication.

Performance Analysis of Interconnected Communication Networks

As the means for communication of users in different communication networks and network resource sharing, communication network interconnection has been paid great attention to in recent years. The performance analysis of internetworks is very important in communication network interconnection, for it is the basis for the study of other problems concerned. The main contribution of this paper is a wide and deep study of performance of internetwork, the construction of systematic performance analysis method for arbitrary internetworks, and of queuing model for gateways. In this paper, the performance analysis of internetwork with arbitrary topology is studied for the first time, and a new method - Node Equivalence of Subnetworks (NES) is proposed. The key step of this method is the node equivalence of subnetworks of all kinds, so we first deeply study the node equivalence, and develop two models for node equivalence. Then we study the node equivalence of CSMA/CD and SLOTTED ALOHA systems by using these models. The results show that the NES method is a systematic method which is suitable for performance analysis of any type of internetworks. The proposed equivalence models is usable with good approximation. The queuing model of gateway is first widely studied in this paper. The queuing model for gateways with packet fragmentation and reassembly is studied for the first time and the analysis method, proposed. In the analysis, two modeling tools, Reversed Switched Poisson Process (RSPP) and Switched Determined Process (SDP), are proposed and RSPP/M/1 queue and SDP/D/1 queue, analyzed. A new method-minislot method is proposed and used for the study of SDP/D/1 queue and performance of ATM multiplexer. In this paper, the interdeparture time distribution of ATM network under some input traffic models is studied and the expression, derived. These results can be used for both performance evaluation of ATM network and the performance of ATM networks interconnected with other networks. We also propose an approximate analysis method for queuing networks with priority service and the queuing networks with packet fragmentation and reassembly.

基于移动互联网眼底成像的糖尿病眼底病变防控模式与实践研究

目的:为基层社区、远程专科机构和团队共同对辖区糖尿病患者眼底病变开展筛查提供技术支持,提升重大慢性非传染性疾病防控能力。方法:设计一个可用于防控某单种重大慢性非传染性疾病、具有业务-信息-金融互流,以及价值共赢的流程图;选出20名拟预试对象,采用手持眼底镜对其眼底部进行拍照,再通过协同服务平台将所采集图片远程传送到异地的专科机构和团队进行研读;对居民现场询问或活动结束一周随访,进一步筛查分析。结果:入选的20名拟预试对象中,17名接受并参与了预试,其中8名发现有眼底病变,且当中1名伴有疑似眼底渗血征。结论:通过手持眼底镜和互联移动操作平台卫生医疗协同服务,开展区域防控居民糖尿病眼底病变筛查结合健康教育,可构建区域卫生医疗协同共赢服务模式,有助于提升重大慢性非传染性疾病防控能力。

基于互联互通CBTC系统差异性的故障分析

描述了基于通信的列车控制(CBTC)系统的互联互通方案,介绍了不同列车运行等级下,CBTC 系统列车互联互通的跨线和共线运营场景,以及主要功能测试分类。在此基础上,重点分析了由 CBTC 信号系统互联互通所产生的典型故障案例:列车过信号机时的二次闯灯问题。通过建立数学模型,研究了二次闯灯现象产生的条件,利用状态转移图和时序图解释了二次闯灯后引起不同故障现象的原理,并给出通过工程设置和软件处理两种途径来解决二次闯灯问题的方案。

基于4G的机器人与云平台无线数据传输系统设计

将机器人采集到的温度、湿度和位置等数据信息传送至云平台服务器,便于云端数据分析、机器人数据共享以及人机信息交互等。本文应用第4代移动通信技术(the 4th generation mobile communication technology,4G)无线传输技术,设计的机器人与云平台无线数据传输系统主要包括硬件和软件实现2个部分,硬件方面机器人通过32位微控制器(STMicroelectronics32,STM32)嵌入式系统与4G模块组合,将传感器采集到的数据信息,通过Internet网络传输到云平台服务器中,软件部分运用C语言编程通过网络透传模式(transmission control protocol/user datagram protocol, TCP/UDP)实现无线通信过程,最终实验验证了机器人与云平台服务器之间的双向无线数据传输功能。

Special Topic: Intellicise Communication System

Editorial With the lightning speed of artificial intelligence,brain-like intelligence,and modern communications technology evolution,it is no wonder that the demand for intelligent mobile communications has increased rapidly in recent years.The future of communication networks is beginning to shift towards a new paradigm from data-oriented information interconnections to intelligence-oriented information interconnections.The paradigm shift relies on high-speed wireless transmission and demands more network intelligence and service diversity.In order to construct the future intelligent communication network,researchers are beginning to rethink how mobile communication systems transmit and exploit intelligent information.Intellicise communication system is the answer to the question.

A Kind of Multistage Interconnection Networks with Multiple Paths

Multistage Interconnection Networks (MINs) are often used to provide interconnections in multiprocessor systems. A unique path MIN usually has lower hardware complekity and a simple control algorithm, but it lacks fault tolerance.This paper proposes a kind of multipath MINs, which are obtained by adding auxiliary links at the final stage in Quad nee (QT) networks so that they canprovide more paths between each source-destination pair, and presents theirrouting algorithm which is both destination tag based and adaptive. Starting with the routing tag for the minimum path between a given source-destinationpair, the routing algorithm uses a set of rules to select switches and modifyrouting tag. In addition to trying the andliary link when linko and link1 areunavailable, link1 will be tried when link0 is unavailable. This feattire dis-tinguishing the proposed routing algorithm from that for QT networks makesbetter use of all the possible paths between the given source-destination pair.In the end, this paper introduces a performance index, which is called capacity,to compare different kinds of MINs. Comparison shows that the proposed MINshave better capacity than QT networks.

On-chip silicon photonic signaling and processing: a review

The arrival of the big data era has driven the rapid development of high-speed optical signaling and processing, ranging from long-haul optical communication links to short-reach data centers and highperformance computing, and even micro-/nano-scale inter-chip and intra-chip optical interconnects.On-chip photonic signaling is essential for optical data transmission, especially for chip-scale optical interconnects, while on-chip photonic processing is a critical technology for optical data manipulation or processing, especially at the network nodes to facilitate ultracompact data management with low power consumption. In this paper, we review recent research progress in on-chip photonic signaling and processing on silicon photonics platforms. Firstly, basic key devices (lasers, modulators, detectors)are introduced. Secondly, for on-chip photonic signaling, we present recent works on on-chip data transmission of advanced multi-level modulation signals using various silicon photonic integrated devices(microring, slot waveguide, hybrid plasmonic waveguide, subwavelength grating slot waveguide).Thirdly, for on-chip photonic processing, we summarize recent works on on-chip data processing of advanced multi-level modulation signals exploiting linear and nonlinear effects in different kinds of silicon photonic integrated devices (strip waveguide, directional coupler, 2D grating coupler, microring,silicon-organic hybrid slot waveguide). Various photonic processing functions are demonstrated, such as photonic switch, filtering, polarization/wavelength/mode (de)multiplexing, wavelength conversion,signal regeneration, optical logic and computing. Additionally, we also introduce extended silicon+photonics and show recent works on on-chip graphene-silicon photonic signal processing. The advances in on-chip silicon photonic signaling and processing with favorable performance pave the way to integrate complete optical communication systems on a monolithic chip and integrate silicon photonics and silicon nanoelectronics on a chip. It is believed that silicon photonics will enable more and more emerging advanced applications even beyond silicon photonic signaling and processing.

Silicon-based optoelectronics:progress towards large scale optoelectronic integration and applications

In the past half century,silicon-based microelectronics and optical fiber communication have triggered a far-reaching information technology revolution,which has moved human society into a high-speed information age.The demand for communication capacity and speed is growing exponentially.On the other hand,data center and high-performance computing are facing bottlenecks of speed,bandwidth,and energy consumption of electrical interconnections.

Rendezvous Facilities in a Distributed Computer System

The distributed computer system described in this paper is a set of computernodes interconnected in an interconnection network via packet-switching interfaces.The nodes communicate with each other by means of message-passing protocols. Thispaper presents the implementation of rendezvous facilities as highlevel prhoitives provided by a parallel programming language to support interprocess cornmunication andsynchronisation.