Zhengsu Tao

Learn More
Media access control (MAC) protocols control how nodes access a shared wireless channel. It is critical to the performance of wireless sensor networks (WSN). An adaptive polling interval and short preamble MAC protocol (AX-MAC) is proposed in this paper. AXMAC is an asynchronous protocol which composed of two basic features. First, rendezvous between the(More)
Analysis of IEEE 802.15.4 CSMA/CA scheme with homogeneous or saturated traffic has received considerable attention recently since a great convenience is offered to applications of low-power and low-rate wireless sensor networks (WSNs) which almost touch upon all aspects of our life. In this paper, we propose a stochastic analysis approach to evaluate the(More)
Wireless sensor network is becoming a new method for monitoring emergency events due to its capabilities of wide monitoring range, self organizing and incessantly working. A model of emergency events monitoring system based on wireless sensor network was presented. The work flow of monitoring system was elaborated at first. Then some requirements were(More)
Abshacf-Aiming at the pipeline safety evaluation, this paper describer a magnetic flux leakage(MFL) model of pipeline defects inspection, designs a MFL intelligent inspection pig to inspect different pipelines. The intelligent Pig includes driver mbof system contmUer, data pmcssor and etc. I t can be used for multi-radius pipelines and various work(More)
Studies of the IEEE 802.15.4 Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) scheme have been received considerable attention recently, with most of these studies focusing on homogeneous or saturated traffic. Two novel transmission schemes-OSTS/BSTS (One Service a Time Scheme/Bulk Service a Time Scheme)-are proposed in this paper to improve(More)