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Data aggregation is an important mechanism to reduce energy consumption in Wireless Sensor Networks (WSNs). By investigating spatial and/or temporal correlation of raw data, sensor nodes can aggregate raw data to a meaningful digest instead of directly sending raw data to sink, this process is considered as data aggregation. Several aggregation works focus on the raw data, they use raw data to cluster...
Data aggregation has been developed to take benefits from either spatial or temporal correlation of collected data. In wireless sensor networks, data aggregation is a key mechanism to reduce energy consumption and to increase capacity. Most current aggregation functions are designed for specific network topology or data pattern, with prior assumptions. Concretely, these functions are developed with...
Data aggregation is a key problem in wireless sensor networks due to both energy-constrained and bandwidth-constrained. In this paper, we highlight the aggregation benefits in network layer and MAC layer by modeling the energy consumption for some energy-efficient routing protocols and MAC protocols. Besides, we define two parameters, aggregation ratio w and packet size coefficient λ, to evaluate...
Wireless sensor networkshas a bright future because of its low-cost, save-power, and easy implementation .etc. However, its security problems have become hot research topics in many applications. Sinkhole attack is just one of frequently encountered security problems, which is easily combined with other attacks to cause more damage. In order to prevent sinkhole attack, we do some research on it, and...
The practical applications of wireless sensor networks require robust time synchronization. In this paper we describe the Flooding Time Synchronization Protocol (FTSP) that provides time synchronization service in such networks. We found there are Key nodes and Non-key nodes when using FTSP in the case of temperature interference. This protocol was designed to utilize low communication bandwidth,...
Precision Agriculture Monitor System (PAMS) is an intelligent system which can monitor the agricultural environments of crops and provides service to farmers. PAMS based on the wireless sensor network (WSN) technique attracts increasing attention in recent years. The purpose of such systems is to improve the outputs of crops by means of managing and monitoring the growth period. This paper presents...
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