Wireless Sensor Networks(WSNs) has become a popular research topic due to its resource constraints. Energy consumption and transmission delay is crucial requirement to be handled to enhance the popularity of WSNs. In ...Wireless Sensor Networks(WSNs) has become a popular research topic due to its resource constraints. Energy consumption and transmission delay is crucial requirement to be handled to enhance the popularity of WSNs. In order to overcome these issues, we have proposed an Efficient Packet Scheduling Technique for Data Merging in WSNs. Packet scheduling is done by using three levels of priority queue and to reduce the transmission delay. Real-time data packets are placed in high priority queue and Non real-time data packets based on local or remote data are placed on other queues. In this paper, we have used Time Division Multiple Access(TDMA) scheme to efficiently determine the priority of the packet at each level and transmit the data packets from lower level to higher level through intermediate nodes. To reduce the number of transmission, efficient data merge technique is used to merge the data packet in intermediate nodes which has same destination node. Data merge utilize the maximum packet size by appending the merged packets with received packets till the maximum packet size or maximum waiting time is reached. Real-time data packets are directly forwarded to the next node without applying data merge. The performance is evaluated under various metrics like packet delivery ratio, packet drop, energy consumption and delay based on changing the number of nodes and transmission rate. Our results show significant reduction in various performance metrics.展开更多
Different weight percentage of ZnBr_(2) doped poly(vinyl alcohol)(PVA)free standing composite films were prepared using solution casting method.These films were characterized for analyzing structural,dielectric,electr...Different weight percentage of ZnBr_(2) doped poly(vinyl alcohol)(PVA)free standing composite films were prepared using solution casting method.These films were characterized for analyzing structural,dielectric,electrochemical properties.This paper mainly focused to understand the contribution of physical phenomenon on conductivity in terms of dielectric parameters.FTIR spectrum confirms the interaction between ZnBr_(2) and PVA.Pseudo-capacitive behavior observed from cyclic voltammograms.Dielectric properties of the composites follow non-Debye type behavior.The conducting phenomenon occurs due to hopping of ions between coordination sites present in the composite and the segmental relaxation of polymer chain.展开更多
This paper focuses on the dielectric constant("0),dielectric loss factor("00)and frequency dependent conductivity(ac)properties of newly prepared poly(vinylalcohol)(PVA)chitosan(CS)composite films incorpora...This paper focuses on the dielectric constant("0),dielectric loss factor("00)and frequency dependent conductivity(ac)properties of newly prepared poly(vinylalcohol)(PVA)chitosan(CS)composite films incorporated with different concentrations of LiClO_(4).The composite films were prepared using solution casting technique.The complexation between salt and polymer host is confirmed by FT Raman and UV-Vis studies.The sample containing 20 wt.%LiClO_(4)exhibits a highest ionic conductivity of 3106 S/cm at room temperature.The dielectric properties of the composites follow non-Debye behavior.展开更多
文摘Wireless Sensor Networks(WSNs) has become a popular research topic due to its resource constraints. Energy consumption and transmission delay is crucial requirement to be handled to enhance the popularity of WSNs. In order to overcome these issues, we have proposed an Efficient Packet Scheduling Technique for Data Merging in WSNs. Packet scheduling is done by using three levels of priority queue and to reduce the transmission delay. Real-time data packets are placed in high priority queue and Non real-time data packets based on local or remote data are placed on other queues. In this paper, we have used Time Division Multiple Access(TDMA) scheme to efficiently determine the priority of the packet at each level and transmit the data packets from lower level to higher level through intermediate nodes. To reduce the number of transmission, efficient data merge technique is used to merge the data packet in intermediate nodes which has same destination node. Data merge utilize the maximum packet size by appending the merged packets with received packets till the maximum packet size or maximum waiting time is reached. Real-time data packets are directly forwarded to the next node without applying data merge. The performance is evaluated under various metrics like packet delivery ratio, packet drop, energy consumption and delay based on changing the number of nodes and transmission rate. Our results show significant reduction in various performance metrics.
基金Science and Engineering Research Board(SERB)Department of Science and Technology(DST),Government of India for the research projects(SR/FTP/PS-011/2010)and(SB/EMEQ-089/2013).
文摘Different weight percentage of ZnBr_(2) doped poly(vinyl alcohol)(PVA)free standing composite films were prepared using solution casting method.These films were characterized for analyzing structural,dielectric,electrochemical properties.This paper mainly focused to understand the contribution of physical phenomenon on conductivity in terms of dielectric parameters.FTIR spectrum confirms the interaction between ZnBr_(2) and PVA.Pseudo-capacitive behavior observed from cyclic voltammograms.Dielectric properties of the composites follow non-Debye type behavior.The conducting phenomenon occurs due to hopping of ions between coordination sites present in the composite and the segmental relaxation of polymer chain.
基金The authors are thankful to Department of Atomic Energy,Board of Research in Nuclear Sciences(BRNS),Government of India for the research project(2010/37C/7/BRNS/832)Department of Science and Technology(DST),Government of India for the research project(SR/FTP/PS-011/2010).
文摘This paper focuses on the dielectric constant("0),dielectric loss factor("00)and frequency dependent conductivity(ac)properties of newly prepared poly(vinylalcohol)(PVA)chitosan(CS)composite films incorporated with different concentrations of LiClO_(4).The composite films were prepared using solution casting technique.The complexation between salt and polymer host is confirmed by FT Raman and UV-Vis studies.The sample containing 20 wt.%LiClO_(4)exhibits a highest ionic conductivity of 3106 S/cm at room temperature.The dielectric properties of the composites follow non-Debye behavior.
