xAAL: A Distributed Infrastructure for Heterogeneous Ambient Devices

Ambient assisted living systems are based on sensors and actuators, with a diversity of network protocols and vendors. This commonly leads to the introduction of gateways or middlewares into the technical infrastructure in order to address interoperability issues. The xAAL framework presented in this paper aims to provide interoperability and to redesign such “gateways” into well-defined functional entities communicating with each other via a lightweight message bus over IP. Each entity may have multiple instances, may be shared between several boxes, and may be physically located in any box. Thanks to the distributed architecture of the system, each home automation vendor may peacefully provide its own xAAL box without revealing details of its technology. Also, several applications may be plugged together on the xAAL bus without getting bored with underlying heterogeneity. Moreover, the management of the dynamicity allows sensors or applications to enter and leave the system at any time.

Research on the WAMS Real-Time Data Processing Based on the Message Bus

Senior applications based on PMU have to process a large amount of data. An effective method to solve the problem is need to find. Firstly, the characteristics of real-time data message of WAMS and the method for receiving and processing real-time data based on the message bus of the smart grid dispatching technical support system were analyzed, and then, the producer/consumer model which is commonly used in the data receiving and processing was introduced emphatically. The advantages and disadvantages of three different ways to realize the buffer were explained. Finally, the test results of practical application were given. The test results show the producer / consumer model using the ring buffer can effectively solve the problem of a large number of PMU data processing.

Design of Mini-Message Bus Control System Compiler

This paper studies the application programming interface in configuration software. Based on comprehensively considering softwares application, a mini-message bus configuration languageMMBCL language is designed by using C language, whose compiler and development environment are fulfilled. The designing, syntax analysis, semantic analysis of MMBCL are deeply discussed. This configuration language is simple, similar to C language, easy to write, consistent with industrial control standard. And it has successfully applied to the industrial project and proves the efficiencies of the configuration language and the compiler.