Research And Implementation Of Loosely Coupled Internet Of Things Architecture And Road Network ISCS Platform

As the information technology advances dramatically,the Internet has swept the people's life.The need of “all things to be intelligent” drives the development of “Internet of Everything(IOE)”.As a paramilitary field,rail traffic is a conservative field with lowest degree of marketization.The development speed of China railway technology ranked top worldwide,but its operation and maintenance & management fields are still old fashioned,and it urgently needs the supports from informatization IOT(Internet of Things)maintenance & management platform.To keep up with the development tendency of comprehensive,diverse,cross-domain,and fast iterative global IOT products,and break through the current status of the traditional IOT including line development,poor scalability and high operational and maintenance cost,it is extremely urgent to study the IOT application architecture with high cohesion and low coupling.Therefore,this study is not only of theoretical significance but also of practical application significance.In this dissertation,the design of ISCS(Integrated Supervisory Control System)of urban railway system is taken as the background,IOT architecture is studied and analyzed from software and theory aspects,a set of IOT architecture with loose coupling is constructed by focusing on isolation and scalability,and moreover,the in-depth study and design are conducted on data transmission scheme of client side and server side and the task processing strategy of maintenance & management business.This IOT frame structure is equipped with good fusion faculty and ductility,which is suitable for agile development thus to improve products' development efficiency and shorten the iteration cycle,with underestimated competitive advantages in IOT industry.Next,the structure and function design scheme of the most core configuration monitoring system and maintenance & management system based on ISCS platform of this IOT frame is stated in detail.The main study and innovation in this dissertation are listed as follows:1.The deficiencies of the traditional IOT architecture are analyzed based on investigating the existing domestic and overseas IOT architecture and the development status of IOT application platform,and moreover,the IOT architecture model with loose coupling is designed.The design ideas and implementation details of the frame are explained in detail through narrating the functions of hierarchical structures including Microservice cluster,base component library,IOT application integration,and edge data flow control;2.It is proposed to replace XML(Extensible Markup Language)by JSON(JavaScript Object Notation)to serve as the storage format of primary static data in IOT platform aiming at the problems such as large data exchange capacity and low transmission efficiency between client end and server end of IOT application platform.Moreover,the preprocess-based LZMA(Lempel-Ziv-Markov chain-Algorithm)algorithm is designed to compress JSON data.The simulation experiment shows that comparing to other compression algorithms,the J-LZMA(JSON-Lempel-Ziv-Markov chain-Algorithm)algorithm proposed in this dissertation possesses the obvious advantages,and it is able to effectively improve the data transmission efficiency in IOT system;3.The current status of low resource utilization rate and poor intelligent level of maintenance & management business of IOT platform is analyzed comprehensively,the task execution strategy based on PDCA(Plan Do Check Action)cycle is proposed to be applied in the modeling of maintenance & management business.The genetic algorithm(GA)with gene coding of multiple traits is designed to intelligently allocate coordination tasks,thus to improve the informatization and labor utilization rate of the platform.The simulation experiments are designed to verify the algorithm performance.The experiment results showed that the algorithm proposed in this dissertation has significant advantages in terms of convergence and optimization comparing to the particle swarm optimization;4.Based on the previous study 1,2 and 3,IOTISCS platform is developed and realized according to the actual needs of road network operation and management.And moreover,its core configuration monitoring system and maintenance & management system are emphatically stated.