Applied Mechanics and Materials Vols. 571-572

Abstract: At present, wireless communication networks obtain preliminary application in underground metal mines, but the problems of anti-interference ability and communication capability generally exist. With regard to this situation, this paper proposed an IEEE 802.11n based multi-channel MAC protocol (MC-MAC), which supports multi-channel dynamically switching by evaluating real time channel packet received rate. MC-MAC can improve wireless networks’ data throughput, anti-interference ability, and communication reliability. To evaluate the practical performance of MC-MAC, This paper designed and implemented an wireless access point based on IEEE 802.11n as testing platform, experimental results show that MC-MAC can provide 193Mbps physical links rate and improve network anti-interference ability effectively, it is suitable for underground metal mine applications.

Abstract: In ad hoc networks, the maintenance scheme of an inter-zone route in ZRP (Zone Routing Protocol) makes ZRP take less reliability, more transmission delay and more routing overheads. Aiming at the problem above, BSRZRP (Backup Segment Routes based Zone Routing Protocol) was proposed. In BSRZRP, an inter-zone route was repaired by using backup segment routes as much as possible when an inter-zone route-link opened. This improved method is favor to improve protocol reliability and reduce transmission delay and routing overheads of protocol.

Abstract: WSN (Wireless sensor network) using ZigBee has aroused people’s high interest, ZigBee is considered to be a general solution in many fields such as intelligent household, industrial application, security monitoring and medical application. But wireless sensor network can only provide service within a certain range, in order to overcome this limitation and provide remote application capacity, this paper proposes a technological solutions for the interconnection of ZigBee network and the Ethernet, develops a ZigBee gateway based on ARM platform. Based on the analysis of the ZigBee protocol stack and TCP/IP protocol stack, the protocol conversion mechanism of ZigBee and TCP/IP is presented. Through transplantation LwIP protocol stack, this paper achieves the goal of connecting gateway to Internet, and finally realizes the conversion from ZigBee network to TCP/IP network.

Abstract: Mobile Wireless Network Management System provides a new concept in the research of network management. Supported by mobile terminals, the work achieves the mobilization of network management which is of great convenience and efficiency.

Abstract: This paper designs and implements an IEEE 802.11n based mining high power access point to improve the disadvantages of low throughput, low communication distance which are met in current mining communication systems. By adding high power design to transmitting and receiving path, this design can get over more than 190Mbps throughput in lab testing, and can achieve more than 2km outdoor communication distance. Test results show that the mining high power access point is more suitable for mining application.

Abstract: Petri nets have structure and behavior properties, it is convenient to analyze some complex system based on its mathematical analysis methods. Online top-up system is an open network system. The modeling method of this system based on general Petri net has some limitations. A new modeling method based on open Petri net to study online top-up system is proposed, and analyze the open Petri net model by T-invariant. This method laid a foundation for the study of open online top-up system.

Abstract: Existing auto after-sales service recommendation only based on user' history behavior, and doesn't take user's real-time location into account, and the recommended result doesn’t meet user’s needs well. Aiming at the problem of traditional recommendation, put forward the personalized recommendation method based on LBS. This method takes the user as the core, by analyzing user's real-time behavior, historical behavior and the user's real-time geographic location, speculated the user's current needs, and recommend accurate information for them.

Abstract: A fast and efficient matching algorithm is proposed to address the issue on multi-pattern matching of double-byte string, for example Chinese characters, which has major difference with single-byte string matching algorithm. The algorithm capitalizes on double cross link data list and two finite prefix automata to match a double-byte character, so as to solve the storage expansion problems in which the double-byte cross data link table results. The method requires less storage in comparison with double-byte cross data link table, and has the same order of magnitude in efficiency as a single-byte cross-link table approach.

Abstract: Through the process of establishing energy cluster type of network routing layer analysis, design and implementation of energy optimization methods at all stages of the path to create, In this paper, laid separately from the mobile sensor nodes in sensor nodes, and even moving the position of the cluster point sink to optimize the energy consumption of the network in order to obtain maximum network cycle, these strategies have received a certain effect, but if from the sensor energy consumption of the network to optimize the balance, then the network will be extended for longer period.

Abstract: Base on the dispersive atom-cavity field interaction, the scheme for preparing the entangled coherent state is discussed. An experimentally feasible protocol for realizing entanglement concentration of the entangled coherent states by using a two-level atom interacting with caving fields is proposed. In this protocol, the entanglement between two coherent states, and , with the same amplitude but a phase difference is utilized as the quantum communication channel. The process of the entanglement concentration is implemented by using a two-level atom interacting with caving fields and two-modes orthogonal states measurement. With the present development of cavity quantum electrodynamics (QED) techniques, the scheme can be achieved.