Data collection using a mobile sink in a Wireless Sensor Network(WSN)has received much attention in recent years owing to its potential to reduce the energy consumption of sensor nodes and thus enhancing the lifetime ...Data collection using a mobile sink in a Wireless Sensor Network(WSN)has received much attention in recent years owing to its potential to reduce the energy consumption of sensor nodes and thus enhancing the lifetime of the WSN.However,a critical issue of this approach is the latency of data to reach the base station.Although many data collection algorithms have been introduced in the literature to reduce delays in data delivery,their performances are affected by the ight trajectory taken by the mobile sink,which might not be optimized yet.This paper proposes a new path-nding strategy,called Energy-efciency Path-nding Strategy(EPS)in the Air-Ground Collaborative Wireless Sensor Network(AGCWSN).The proposed approach is able to greatly enhance the efciency of data collection.The performance of the proposed strategy is simulated and compared with the existing strategies over several parameters.The simulation results show that the mobile sink with EPS can collects data with lower data delivery delay as compared to other existing strategies.The number of data retransmissions between sensor nodes and mobile sink in EPS is also the lowest in EPS among several existing strategies.The data delivery delay is 66%and 120%lower than Rest Center Tractor Scanning(RCTS)and Non-stop Center Tractor Scanning(NCTS)in irregular and grid topology respectively.The data delivery delay is 62%lower than Two Row Scanning(TRS)in grid topology and 120%lower than RkM in irregular topology.The packet loss of EPS-2 is 1.3%lower than RkM.展开更多
This letter presents an autofocus （AF） method to position a high-magnification microscope lens that automatically captures hundreds of images from a single moving slide. These images are taken by a mobile clinic uni...This letter presents an autofocus （AF） method to position a high-magnification microscope lens that automatically captures hundreds of images from a single moving slide. These images are taken by a mobile clinic unit in a rural location, and are later automatically processed and revised by a remote specialist. This process requires high focus precision to enable image processing techniques to achieve proper results. Low focusing times are also required for the system to be operative. We propose a novel method that combines two focus measures with an adapted searching scheme to cope with both constraints.展开更多
文摘Data collection using a mobile sink in a Wireless Sensor Network(WSN)has received much attention in recent years owing to its potential to reduce the energy consumption of sensor nodes and thus enhancing the lifetime of the WSN.However,a critical issue of this approach is the latency of data to reach the base station.Although many data collection algorithms have been introduced in the literature to reduce delays in data delivery,their performances are affected by the ight trajectory taken by the mobile sink,which might not be optimized yet.This paper proposes a new path-nding strategy,called Energy-efciency Path-nding Strategy(EPS)in the Air-Ground Collaborative Wireless Sensor Network(AGCWSN).The proposed approach is able to greatly enhance the efciency of data collection.The performance of the proposed strategy is simulated and compared with the existing strategies over several parameters.The simulation results show that the mobile sink with EPS can collects data with lower data delivery delay as compared to other existing strategies.The number of data retransmissions between sensor nodes and mobile sink in EPS is also the lowest in EPS among several existing strategies.The data delivery delay is 66%and 120%lower than Rest Center Tractor Scanning(RCTS)and Non-stop Center Tractor Scanning(NCTS)in irregular and grid topology respectively.The data delivery delay is 62%lower than Two Row Scanning(TRS)in grid topology and 120%lower than RkM in irregular topology.The packet loss of EPS-2 is 1.3%lower than RkM.
基金supported by the CONACYT/204212the DGEST of the Mexican Government under the PROMEP/107.5/10/5417
文摘This letter presents an autofocus （AF） method to position a high-magnification microscope lens that automatically captures hundreds of images from a single moving slide. These images are taken by a mobile clinic unit in a rural location, and are later automatically processed and revised by a remote specialist. This process requires high focus precision to enable image processing techniques to achieve proper results. Low focusing times are also required for the system to be operative. We propose a novel method that combines two focus measures with an adapted searching scheme to cope with both constraints.
