The Experts below are selected from a list of 8004 Experts worldwide ranked by ideXlab platform
Kristian Torp - One of the best experts on this subject based on the ideXlab platform.
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MDM - FoGBAT: Combining Bluetooth and GPS Data for Better Traffic Analytics
2016 17th IEEE International Conference on Mobile Data Management (MDM), 2016Co-Authors: Johannes L. Borresen, Christian S Jensen, Kristian TorpAbstract:Congestion is a major problem in many cities. In order to monitor and manage traffic, a number of different Sensor Types are used to collect traffic data. This includes GPS devices in the vehicles themselves as well as fixed Bluetooth Sensors along the roads. Each Sensor Type has advantages and disadvantages. Where GPS has a wide coverage of the road network, Bluetooth Sensors gather data from a much higher number of vehicles. In this paper we present Fog BAT, a system that combines GPS data with Bluetooth data. The goal of the system is to retain the advantages of both. We show how the data Types are aligned to ensure that data from each Sensor Type is related to the exact same part of the road network and cover the same time period. Using very large real-world data sets, we use the system to compare travel speeds based on each data Type, and how the use of both data Types simultaneously can improve the accuracy of computed travel speeds and congestion levels.
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FoGBAT: Combining Bluetooth and GPS Data for Better Traffic Analytics
2016 17th IEEE International Conference on Mobile Data Management (MDM), 2016Co-Authors: Johannes L. Borresen, Christian S Jensen, Kristian TorpAbstract:Congestion is a major problem in many cities. In order to monitor and manage traffic, a number of different Sensor Types are used to collect traffic data. This includes GPS devices in the vehicles themselves as well as fixed Bluetooth Sensors along the roads. Each Sensor Type has advantages and disadvantages. Where GPS has a wide coverage of the road network, Bluetooth Sensors gather data from a much higher number of vehicles. In this paper we present Fog BAT, a system that combines GPS data with Bluetooth data. The goal of the system is to retain the advantages of both. We show how the data Types are aligned to ensure that data from each Sensor Type is related to the exact same part of the road network and cover the same time period. Using very large real-world data sets, we use the system to compare travel speeds based on each data Type, and how the use of both data Types simultaneously can improve the accuracy of computed travel speeds and congestion levels.
Jijun Xiong - One of the best experts on this subject based on the ideXlab platform.
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a gaas acoustic Sensor with frequency output based on resonant tunneling diodes
Sensors and Actuators A-physical, 2007Co-Authors: Binzhen Zhang, Chenyang Xue, Wendong Zhang, Jian Wang, Jijun XiongAbstract:This paper reports a novel acoustic Sensor with a frequency output based on AlAs/InxGa1−xAs/GaAs resonant tunneling diode (RTD). The RTD is incorporated in a 1m thick membrane and the fabrication technology of the membrane is based upon the selective etch of GaAs with AlAs as an etch stop layer. A relaxation oscillator is obtained with the RTD biased in the negative differential resistance (NDR) region. Acoustic pressure applied to the RTD changes the frequency of oscillation due to the shift in current–voltage characteristics. The main feature of this Sensor Type is the direct frequency output, which is linearly dependent on pressure, and the linear sensitivity can be up to 21 kHz/kPa. © 2006 Elsevier B.V. All rights reserved.
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A novel cantilever acoustic Sensor with frequency output based on resonant tunneling diodes
2006 8th International Conference on Solid-State and Integrated Circuit Technology Proceedings, 2006Co-Authors: Jian Wang, Wendong Zhang, Jijun Xiong, Zhao-min TongAbstract:This paper reports a novel GaAs cantilever acoustic Sensor based on AlAs/InxGa1-xAs/GaAs resonant tunneling diode (RTD) with a frequency output. The RTD is incorporated in a 10 mum thick cantilever diaphragm and the fabrication technology of the cantilever diaphragm is based upon the micromachined control holes technology. A relaxation oscillator is obtained with the RTD biased in the negative differential resistance (NDR) region. Pressure applied to the RTD changes the frequency of oscillation due to the shift in current-voltage characteristics. The main feature of this Sensor Type is the direct frequency output and the sensitivity can be up to 102kHz/kPa
Woo Seop Rhee - One of the best experts on this subject based on the ideXlab platform.
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User-centric service environment for context aware service mash-up
2014 IEEE World Forum on Internet of Things WF-IoT 2014, 2014Co-Authors: Hoan Suk Choi, Na Ri Yang, Jun Young Lee, Woo Seop RheeAbstract:The existing service mash-up environment enables user to create context aware services. It is able to build services by recombining ready-made building blocks and connection operations. But a non-technical user is difficult to create context aware service. Because, they don't know principles of service offering (e.g., service platform architecture, concept of ontology, criteria of context, required Sensor Type and etc). To solve this problem, we propose the user-centric service environment. It consists of service mash-up process and the web-based service composition user interface. The user can create target context aware service through easily step-by-step progress. Also, we propose the ontology based semantic Sensor data processing. It removes heterogeneity of Sensor data and processes the object data to the context information.
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User-centric Service Environment for Context Aware
Internet of Things (WF-IoT) 2014 IEEE World Forum on, 2014Co-Authors: Service Mash-up, Hoan Suk Choi, Na Ri Yang, Jun Young Lee, Woo Seop RheeAbstract:The existing service mash-up environment enables user to create context aware services. It is able to build services by recombining ready-made building blocks and connection operations. But a non-technical user is difficult to create context aware service. Because, they don't know principles of service offering (e.g., service platform architecture, concept of ontology, criteria of context, required Sensor Type and etc). To solve this problem, we propose the user-centric service environment. It consists of service mash-up process and the web-based service composition user interface. The user can create target context aware service through easily step-by-step progress. Also, we propose the ontology based semantic Sensor data processing. It removes heterogeneity of Sensor data and processes the object data to the context information
Johannes L. Borresen - One of the best experts on this subject based on the ideXlab platform.
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MDM - FoGBAT: Combining Bluetooth and GPS Data for Better Traffic Analytics
2016 17th IEEE International Conference on Mobile Data Management (MDM), 2016Co-Authors: Johannes L. Borresen, Christian S Jensen, Kristian TorpAbstract:Congestion is a major problem in many cities. In order to monitor and manage traffic, a number of different Sensor Types are used to collect traffic data. This includes GPS devices in the vehicles themselves as well as fixed Bluetooth Sensors along the roads. Each Sensor Type has advantages and disadvantages. Where GPS has a wide coverage of the road network, Bluetooth Sensors gather data from a much higher number of vehicles. In this paper we present Fog BAT, a system that combines GPS data with Bluetooth data. The goal of the system is to retain the advantages of both. We show how the data Types are aligned to ensure that data from each Sensor Type is related to the exact same part of the road network and cover the same time period. Using very large real-world data sets, we use the system to compare travel speeds based on each data Type, and how the use of both data Types simultaneously can improve the accuracy of computed travel speeds and congestion levels.
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FoGBAT: Combining Bluetooth and GPS Data for Better Traffic Analytics
2016 17th IEEE International Conference on Mobile Data Management (MDM), 2016Co-Authors: Johannes L. Borresen, Christian S Jensen, Kristian TorpAbstract:Congestion is a major problem in many cities. In order to monitor and manage traffic, a number of different Sensor Types are used to collect traffic data. This includes GPS devices in the vehicles themselves as well as fixed Bluetooth Sensors along the roads. Each Sensor Type has advantages and disadvantages. Where GPS has a wide coverage of the road network, Bluetooth Sensors gather data from a much higher number of vehicles. In this paper we present Fog BAT, a system that combines GPS data with Bluetooth data. The goal of the system is to retain the advantages of both. We show how the data Types are aligned to ensure that data from each Sensor Type is related to the exact same part of the road network and cover the same time period. Using very large real-world data sets, we use the system to compare travel speeds based on each data Type, and how the use of both data Types simultaneously can improve the accuracy of computed travel speeds and congestion levels.
Jian Wang - One of the best experts on this subject based on the ideXlab platform.
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a gaas acoustic Sensor with frequency output based on resonant tunneling diodes
Sensors and Actuators A-physical, 2007Co-Authors: Binzhen Zhang, Chenyang Xue, Wendong Zhang, Jian Wang, Jijun XiongAbstract:This paper reports a novel acoustic Sensor with a frequency output based on AlAs/InxGa1−xAs/GaAs resonant tunneling diode (RTD). The RTD is incorporated in a 1m thick membrane and the fabrication technology of the membrane is based upon the selective etch of GaAs with AlAs as an etch stop layer. A relaxation oscillator is obtained with the RTD biased in the negative differential resistance (NDR) region. Acoustic pressure applied to the RTD changes the frequency of oscillation due to the shift in current–voltage characteristics. The main feature of this Sensor Type is the direct frequency output, which is linearly dependent on pressure, and the linear sensitivity can be up to 21 kHz/kPa. © 2006 Elsevier B.V. All rights reserved.
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A GaAs acoustic Sensor based on resonant tunnelling diodes
Proceedings of IEEE Sensors, 2006Co-Authors: Jian Wang, Binzhen Zhang, Chenyang Xue, Wendong Zhang, Jinming LiAbstract:This paper reports a novel acoustic Sensor with a frequency output based on AlAs/InxGa1-xAs/GaAs resonant tunneling diode (RTD). The RTD is incorporated in a 1 μm thick membrane and the fabrication technology of the membrane is based upon the selective etch of GaAs with AlAs as an etch stop layer. A relaxation oscillator is obtained with the RTD biased in the negative differential resistance (NDR) region. Acoustic pressure applied to the RTD changes the frequency of oscillation due to the shift in current-voltage characteristics. The main feature of this Sensor Type is the direct frequency output, which is linearly dependent on pressure, and the linear sensitivity can be up to 21 kHz/kPa. © 2006 Elsevier B.V. All rights reserved.
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A novel cantilever acoustic Sensor with frequency output based on resonant tunneling diodes
2006 8th International Conference on Solid-State and Integrated Circuit Technology Proceedings, 2006Co-Authors: Jian Wang, Wendong Zhang, Jijun Xiong, Zhao-min TongAbstract:This paper reports a novel GaAs cantilever acoustic Sensor based on AlAs/InxGa1-xAs/GaAs resonant tunneling diode (RTD) with a frequency output. The RTD is incorporated in a 10 mum thick cantilever diaphragm and the fabrication technology of the cantilever diaphragm is based upon the micromachined control holes technology. A relaxation oscillator is obtained with the RTD biased in the negative differential resistance (NDR) region. Pressure applied to the RTD changes the frequency of oscillation due to the shift in current-voltage characteristics. The main feature of this Sensor Type is the direct frequency output and the sensitivity can be up to 102kHz/kPa
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A GaAs Acoustic Sensor Based On Resonant Tunnelling Diodes
SENSORS 2006 IEEE, 2006Co-Authors: Jian Wang, Binzhen Zhang, Wendong Zhang, Jinming LiAbstract:This paper reports a novel GaAs cantilever acoustic Sensor based on AlAs/In1-xGa1-xAs/GaAs resonant tunneling diode (RTD) with a frequency output. The RTD is incorporated in a 10 mum thick cantilever diaphragm and the fabrication technology of the cantilever diaphragm is based upon the micromachined control holes technology. A relaxation oscillator is obtained with the RTD biased in the negative differential resistance (NDR) region. Pressure applied to the RTD changes the frequency of oscillation due to the shift in current-voltage characteristics. The main feature of this Sensor Type is the direct frequency output and the sensitivity can be up to 102KHz/KPa.
