This work discusses the special relationship between the sensor range and the communication range in WSN, and researches on the deployment methods in closed or semi-closed area with particular shape, also figures out an optimal deployment algorithm which can satisfy both coverage and connectivity by using nodes as few as possible.

China Unicom Long-Distance Customer Service & Billing Management System Design;

The Discussion about the Channel Construction of China Unicom Mobile Communication Business;

It lucubrates under the new situation, the market development of Dongying Unicom and the problems in marketing of Dongying Unicom.

As a well-known telecommunication carrier enterprise in China, China Unicom has been attracting people\'s attention during the reform and development in the telecommunication industry.

ATM over SDH project for freeway network communication;

By system analysis of the whole network toll collection process, this paper formulates the model of system toll, the plan of monitoring and the corresponding network communication business design.

The use of differential pressure compensator resolved the difficult problem that partial fan was damaged when fiexible air duct was withdrawn in long blind heading series ventilation, which renewed the mutil partial fan ventilating method.

The paper analyzed existing problems of automatic power-off of local fan monitoring in three kinds of series ventilation mode of tunneling face series tunneling face,coal face series tunneling face,tunneling face series coal face and adopted corresponding solutions,and gave detailed graphic.

The series ventilation is a kind of ventilation way that the return air at the underground using wind place enters other using wind place again.

Communicating oil pressure is one of fundmental parameters,by which beat times and forging force of the hammer and capacity of the pump can be determined with this basis for the design of the hydraulic system.