Ling Zhihao

The research and implement of smart home system based on Internet of Things

With the rapid development of Internet of Things, smart home which regarded as one of the main application domains, obtained more and more peoples attention. In this paper, the characteristics and disadvantages of smart home system are analyzed. Then a smart home system based on B/S(Browse/Server) module is introduced. Through publishing the household wireless sensor network data to the web page of a remote server, users can control the household devices conveniently and remotely. Its system architecture, hardware design and implementation approach are given. This system provides a more flexible and more convenient control for smart home system and is beneficial for the popularity and promotion of smart home system.

Distributed formation control for a multi-agent system with dynamic and static obstacle avoidances

Formation control and obstacle avoidance for multi-agent systems have attracted more and more attention. In this paper, the problems of formation control and obstacle avoidance are investigated by means of a consensus algorithm. A novel distributed control model is proposed for the multi-agent system to form the anticipated formation as well as achieve obstacle avoidance. Based on the consensus algorithm, a distributed control function consisting of three terms (formation control term, velocity matching term, and obstacle avoidance term) is presented. By establishing a novel formation control matrix, a formation control term is constructed such that the agents can converge to consensus and reach the anticipated formation. A new obstacle avoidance function is developed by using the modified potential field approach to make sure that obstacle avoidance can be achieved whether the obstacle is in a dynamic state or a stationary state. A velocity matching term is also put forward to guarantee that the velocities of all agents converge to the same value. Furthermore, stability of the control model is proven. Simulation results are provided to demonstrate the effectiveness of the proposed control.

Research on terminal cooperation in ubiquitous network

Terminal cooperation can make up for the deficiency of single terminal in perception, communication, computing, service presentation and other aspects. This paper enumerates typical application scenarios of terminal cooperation in ubiquitous network, and key tecnologies in terminal environment need to be studied are also analyzed. Following that, a framework of terminal middleware is put forward, including service demand processing, service discovery, context-aware, data processing, cooperation control, safety control and other functional components. Finally, based on the above method, we have developed a terminal cooperation application system, which demonstrates the cooperative downloading of multimedia files.

The research and implementation of wireless mesh protocol in industry

With its application in industry, the wireless technology need to satisfy the higher demand in harsh industrial environment. This paper first analyzed the WirelessHART protocol, and then it merited the mechanism of WirelessHART to design wireless mesh protocol in industry according to application demand. Following that, the modified Dijkstras algorithm was presented on the basis of graph routing. Finally, the feasibility of this protocol and the real-time implementation of the algorithm were verified by simulating in OMNeT++, so this protocol can meet the demand of time deterministic for industry application.

Design and implementation of automatic arithmetic generation system based on remote speech recognition

In this paper, an automatic arithmetic generation system which can be remotely controlled by a particular speaker is designed and implemented to improve childrens interest in learning math and facilitate parents to supervise children. The system is composed of the sender subsystem and the receiver subsystem. The sender subsystem is responsible to recognize speech and send the control command, and then the receiver subsystem can receive the command and execute corresponding program. The hardware system is made up of the SPCE061A microchip, keyboard, NRF2401 and LCD SPLC501 etc. The software system mainly achieves the following functions: recognition of speech, the control of NRF2401, random generation of arithmetic test samples, adjustment of different level, and supply of the correct answer. Finally, the system is experimented in some children. The result of experiment shows the system can greatly improve childrens interest in learning math.

ZigBee technology applied to supervisory system of boiler welding quality

The welding process, detected parameters and its suitable application feature and requirement of boiler have been introduced, the communication technology, protocol and characteristic have been dissected, the design principle of wireless network platform has been discussed, the implementation details of the system software have been analyzed, and the certain problem related to industrial application have been approached.