In China, finding a vacant parking space in a congested area or a large parking lot is always time consuming and frustrating. To minimize hassle and inconvenience to the automatic drivers, this paper proposed a novel smart parking system which consists of many parking sensor nodes and one parking gateway in one large parking lot. Parking sensor node is used as vehicle occupancy detector and parking gateway is used as parking lot manager. All parking sensor nodes compose wireless sensor networks with Zigbee transmission protocol. With the GPRS/3G transmission function of parking gateway, large parking lot can provide friendly parking information to the running vehicles and subscribed users. In a word, the proposed novel smart parking system is provided with innovative and practicability.
The objective of environmental observation with wireless sensor networks is to extract the synoptic structures of the phenomena of region of interest (ROI) in order to make effective predictive and analytical characterizations. Adaptive sampling strategy is regarded as a much promising method for improving energy efficiency in recent years. However, due to distributed characteristics of wireless sensor networks, adaptive sampling schemes should be operated in a distributed manner with clustering algorithm. In this paper, we dedicate to investigating appropriate sensing-aware clustering algorithm for adaptive sampling. The principle of SAC algorithm follows such metric: sensor nodes that are similar to each other in terms of their observed sensory data should be clustered into one group. Besides, sensor nodes will join in its nearest cluster for the sake of spatial correlation model with Euclidean physical distance. By emphasizing on the sensing-aware clustering, it helps to derive better spatial correlation to guarantee adaptive sampling. The simulation results verify SAC algorithm at the aspect of correlation factor.
Abstract-With the Cross Linked Polyethylene (XLPE) power cables increasingly widely used in urban power transmission and distribution network, the reliable operation of XLPE insulated power cable line is becoming more and more important for economic and social development. [1] And there is a need to ensure the reliability of cables by detecting the cable insulation aging state on-line. So that, we developed a set of cable on-line monitoring system which can determine the aging state by the analysis of the current flowing through the cable insulation based on current comparator. Such a distributed measuring system requires the data to be transferred in a wireless way in real time. In order to ensure the reliability of communication, several programs were presented to solve the problem of wireless data transmission between two test equipment based on General Packet Radio Service (GPRS) in this paper. The most suitable one will be select from these programs by analyzing advantages and disadvantages of them to direct the follow-up system debugging.
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