The modern world remains vulnerable to natural disasters,including floods,earthquakes,wildfires,and others.These events remain unpredictable and inevitable,and recovering quickly and effectively requires significant e...The modern world remains vulnerable to natural disasters,including floods,earthquakes,wildfires,and others.These events remain unpredictable and inevitable,and recovering quickly and effectively requires significant effort and expense.Monitoring is becoming more efficient thanks to technologies such as Unmanned Aerial Vehicles(UAVs),which can access hard-to-reach areas and provide real-time data.However,in disaster-affected areas,these monitoring systems may encounter many obstacles when communicating with servers or transmitting monitored data.This paper proposes an adaptive communication model to overcome the challenges faced in disaster-affected areas.A base station is responsible for collecting data(such as images and videos)captured by UAVs performing surveillance within its communication range.This station is typically a tower providing fixed cellular network service.However,in the absence of such a tower,a selected UAV may serve as the station,depending on the situation.If surveillance needs to be performed outside the coverage area,it can continue to communicate via nearby UAVs through cooperative communication.UAVs with internet support,known as the Internet of Flying Things(IoFT),will also be utilized to enhance communication capacity and efficiency.The proposed communication model is validated through experiments,showing superior data transmission performance and higher throughput.Analysis indicates it outperforms traditional systems,even in rural areas,with or without internet access.展开更多
This paper aims to obtain some ＂universal method and result＂ to quantitatively analyze the influence of contact resistance （CR） on OTFTs, which has not been reported up to now. This is partly achieved by means of ...This paper aims to obtain some ＂universal method and result＂ to quantitatively analyze the influence of contact resistance （CR） on OTFTs, which has not been reported up to now. This is partly achieved by means of the simulated method and the introduction of Rc/Rcho （the value of CR/on state channel resistance）. To do this, the OTFT formula from the Brown model is extended, and the parameter （errors carrier mobility/z, saturation voltage Vosat, etc.） caused by Rc are analyzed in detail. Then, the Rc/Rcho test method is emphatically demonstrated, and some meaningful conclusions are drawn. Based on the conclusion, it is the first time that a ＂universal method＂ of estimating the errors caused by Rc has been put forward. Experimental results further prove that the method is correct.展开更多
文摘The modern world remains vulnerable to natural disasters,including floods,earthquakes,wildfires,and others.These events remain unpredictable and inevitable,and recovering quickly and effectively requires significant effort and expense.Monitoring is becoming more efficient thanks to technologies such as Unmanned Aerial Vehicles(UAVs),which can access hard-to-reach areas and provide real-time data.However,in disaster-affected areas,these monitoring systems may encounter many obstacles when communicating with servers or transmitting monitored data.This paper proposes an adaptive communication model to overcome the challenges faced in disaster-affected areas.A base station is responsible for collecting data(such as images and videos)captured by UAVs performing surveillance within its communication range.This station is typically a tower providing fixed cellular network service.However,in the absence of such a tower,a selected UAV may serve as the station,depending on the situation.If surveillance needs to be performed outside the coverage area,it can continue to communicate via nearby UAVs through cooperative communication.UAVs with internet support,known as the Internet of Flying Things(IoFT),will also be utilized to enhance communication capacity and efficiency.The proposed communication model is validated through experiments,showing superior data transmission performance and higher throughput.Analysis indicates it outperforms traditional systems,even in rural areas,with or without internet access.
基金project supported by the Fujian Natural Science Foundation,China(No.2009J05146)
文摘This paper aims to obtain some ＂universal method and result＂ to quantitatively analyze the influence of contact resistance （CR） on OTFTs, which has not been reported up to now. This is partly achieved by means of the simulated method and the introduction of Rc/Rcho （the value of CR/on state channel resistance）. To do this, the OTFT formula from the Brown model is extended, and the parameter （errors carrier mobility/z, saturation voltage Vosat, etc.） caused by Rc are analyzed in detail. Then, the Rc/Rcho test method is emphatically demonstrated, and some meaningful conclusions are drawn. Based on the conclusion, it is the first time that a ＂universal method＂ of estimating the errors caused by Rc has been put forward. Experimental results further prove that the method is correct.
