The Experts below are selected from a list of 16569 Experts worldwide ranked by ideXlab platform
Daniela Dragomirescu - One of the best experts on this subject based on the ideXlab platform.
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Design and Characterization of Compact Antennas for Wireless Sensing Applications
2020Co-Authors: Alassane Sidibe, Alexandru Takacs, Gael Loubet, Daniela DragomirescuAbstract:This paper addresses the design and the characterization of compact antennas designed for wireless Sensing applications. More precisely these antennas have to be integrated in the rectenna part of a battery-free and wirelessly powered wireless Sensing Node embedded in a concrete material. A 3D compact dipole antenna topology is presented, it exhibits at maximum gain of +1.7 dBi at 868 MHz. By integrating this antenna in a metallic cavity, the gain can be enhanced to +4.5 dBi minimizing also the negative impact and the detuning effect of the concrete material on the antenna performances.
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Wirelessly Powered and Battery-Free LoRaWAN Wireless Sensing Nodes Designed for Communicating Reinforced Concrete
2019Co-Authors: Gael Loubet, Alexandru Takacs, Ethan Gardner, Andrea De Luca, Florin Udrea, Daniela DragomirescuAbstract:A Wireless Sensor Network dedicated to Structural Health Monitoring applications in harsh environments, which is the basis for the design of a communicating reinforced concrete, is presented. An autonomous wirelessly powered and battery-free LoRaWAN Sensing Node is highlighted here. The presented system measures temperature and humidity from its environment and transmits the recovered data to a Communicating Node, which interconnects the physical and digital worlds whilst simultaneously powering the Sensing Nodes via a far-field Wireless Power Transmission interface.
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implementation of a battery free wireless sensor for cyber physical systems dedicated to structural health monitoring applications
IEEE Access, 2019Co-Authors: Gael Loubet, Alexandru Takacs, Daniela DragomirescuAbstract:This paper addresses the concept of a wirelessly powered and battery-free wireless sensor for the cyber–physical systems dedicated to the structural health monitoring applications in harsh environments. The proposed material architecture is based on a smart mesh wireless sensor network composed of Sensing Nodes and communicating Nodes. The Sensing Nodes are used to sense the physical world. They are battery-free and wirelessly powered by a dedicated radiofrequency source via a far-field wireless power transmission system. The data collected by the Sensing Nodes are sent to the communicating Nodes that, between others, interface the physical world with the digital world through the Internet. A prototype of the Sensing Node—using a LoRaWAN uplink wireless communication and temperature and relative humidity sensor—has been manufactured, and the experiments have been performed to characterize it. The experimental results prove that the periodicity of measurement and communication can be controlled wirelessly by using only the wireless power transmission downlink. In this paper, we highlight the performance of this complete implementation of a wirelessly powered and battery-free wireless Sensing Node—not yet integrated or miniaturized—designed for implementing complete cyber–physical systems and based on the simultaneous wireless information and power transfer. Finally, an investigation of comparable implementations of the battery-free Sensing Nodes for the cyber–physical systems is carried out.
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Towards the Design of Wireless Communicating Reinforced Concrete
IEEE Access, 2018Co-Authors: Loubet Gael, Alexandru Takacs, Daniela DragomirescuAbstract:This paper addresses the concept of a smart-Node wireless network designed for structural health monitoring applications. The network architecture is based on a smart mesh composed of Sensing Nodes and communicating Nodes. The Sensing Nodes are used to implement the so named communicating material/communicating concrete and collect physical data for structural health monitoring purposes. These data are sent to the communicating Nodes that interface the smart-Node network with the digital world through the Internet. The Sensing Nodes are batteryless and wirelessly powered by the communicating Nodes via a wireless power transmission interface. Experimental results have been obtained for a simplified Sensing Node using a LoRaWAN uplink wireless communication (from the Sensing Node to the communicating Node) proving that the functionality of the Sensing Nodes can be controlled wirelessly by using only the wireless power transmission downlink.
Kok-meng Lee - One of the best experts on this subject based on the ideXlab platform.
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AIM - Real-time computational model for visualizing compliant beam motion of a flexible mobile-Sensing Node
2014 IEEE ASME International Conference on Advanced Intelligent Mechatronics, 2014Co-Authors: Kok-meng Lee, Donghai WangAbstract:Rigid bodies are often connected by compliant elements. In the designs of these compliant mechanisms, actuators can be embedded in the rigid bodies to control the beam deformation. Motivated by the need to visualize the deformed beam shape of a flexible mobile-Sensing Node (FMN) mechanism in real-time operation to aid its human-guided navigation, this paper presents a discrete curvature-based beam model (CBM) taking into account the dynamics of the connecting rigid-body wheel assemblies in modeling the FMN and its solution as a function of path lengths. The wheel assemblies provide input forces to manipulate the bending/twisting of the compliant beam. With experimentally measured magnetic forces/torques contributed by the magnetic adhesion between the FMN and ferrous surface on which the FMN moves, the computational model with dynamic forces of the wheel assemblies as system inputs in global coordinates has been applied to develop a strategy to guide a magnetic-wheeled FMN crossing a change-of-plane corner in tight space.
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Field Validation of Flexure-Based Mobile Sensing Nodes on a Space Frame Bridge
Structural Health Monitoring-an International Journal, 2011Co-Authors: Dapeng Zhu, Yang Wang, J. Guo, Kok-meng LeeAbstract:This research investigates the field validation of flexure-based mobile Sensing Nodes developed for structural health monitoring (SHM). Each mobile Sensing Node is a miniature robot that can carry sensors and automatically navigate on a steel structure. The flexible body design of the mobile Sensing Node allows it to negotiate with sharp corners on the structure. Multiple mobile Nodes then form an organic mobile sensor network that can search for potential structural damage. Our previous research has investigated the performance of the mobile Sensing Nodes through laboratory experiments. The mobile sensor network was able to identify minor structural damage, illustrating a high sensitivity in damage detection that is enabled by the flexible deployment of the mobile Sensing Nodes. This paper extends the investigation into field study with a space frame bridge. Under wireless control command, multiple mobile and tetherless Sensing Nodes navigate autonomously to different sections of the steel bridge, for measuring structural vibrations at high spatial resolution. Using a small number of mobile Sensing Nodes, detailed modal characteristics of the bridge are identified.
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Mobile Sensor Networks: A New Approach for Structural Health Monitoring
Structures Congress 2010, 2010Co-Authors: Dapeng Zhu, Jiajie Guo, Yang Wang, Kok-meng LeeAbstract:ABSTRACT In this paper, a new approach using mobile sensor networks is proposed for structural health monitoring. Compared with static sensors, mobile sensor networks offer flexible system architectures with adaptive spatial resolutions. The paper describes the design concept of a flexure-based mechatronic (flexonic) mobile Sensing Node and its application in structural health monitoring. The flexonic mobile Sensing Node is capable of maneuvering on structures built with ferromagnetic materials, as well as attaching/detaching an accelerometer onto/from a steel structural surface. The performance of the prototype mobile sensor network has been validated through laboratory experiments, where two flexonic mobile Sensing Nodes are adopted for maneuvering on a steel portal frame. Transmissibility function analysis is then conducted to identify structural damage using data collected by the mobile Sensing Nodes. This preliminary work is expected to spawn transformative changes of using mobile sensors for future structural health monitoring.
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A mobile Sensing system for structural health monitoring: Design and validation
Smart Materials and Structures, 2010Co-Authors: Dapeng Zhu, Xiaohua Yi, Kok-meng Lee, Jiajie GuoAbstract:This paper describes a new approach using mobile sensor networks for structural health monitoring. Compared with static sensors, mobile sensor networks offer flexible system architectures with adaptive spatial resolutions. The paper first describes the design of a mobile Sensing Node that is capable of maneuvering on structures built with ferromagnetic materials. The mobile Sensing Node can also attach/detach an accelerometer onto/from the structural surface. The performance of the prototype mobile sensor network has been validated through laboratory experiments. Two mobile Sensing Nodes are adopted for navigating on a steel portal frame and providing dense acceleration measurements. Transmissibility function analysis is conducted to identify structural damage using data collected by the mobile Sensing Nodes. This preliminary work is expected to spawn transformative changes in the use of mobile sensors for future structural health monitoring.
Alexandru Takacs - One of the best experts on this subject based on the ideXlab platform.
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Design and Characterization of Compact Antennas for Wireless Sensing Applications
2020Co-Authors: Alassane Sidibe, Alexandru Takacs, Gael Loubet, Daniela DragomirescuAbstract:This paper addresses the design and the characterization of compact antennas designed for wireless Sensing applications. More precisely these antennas have to be integrated in the rectenna part of a battery-free and wirelessly powered wireless Sensing Node embedded in a concrete material. A 3D compact dipole antenna topology is presented, it exhibits at maximum gain of +1.7 dBi at 868 MHz. By integrating this antenna in a metallic cavity, the gain can be enhanced to +4.5 dBi minimizing also the negative impact and the detuning effect of the concrete material on the antenna performances.
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Wirelessly Powered and Battery-Free LoRaWAN Wireless Sensing Nodes Designed for Communicating Reinforced Concrete
2019Co-Authors: Gael Loubet, Alexandru Takacs, Ethan Gardner, Andrea De Luca, Florin Udrea, Daniela DragomirescuAbstract:A Wireless Sensor Network dedicated to Structural Health Monitoring applications in harsh environments, which is the basis for the design of a communicating reinforced concrete, is presented. An autonomous wirelessly powered and battery-free LoRaWAN Sensing Node is highlighted here. The presented system measures temperature and humidity from its environment and transmits the recovered data to a Communicating Node, which interconnects the physical and digital worlds whilst simultaneously powering the Sensing Nodes via a far-field Wireless Power Transmission interface.
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implementation of a battery free wireless sensor for cyber physical systems dedicated to structural health monitoring applications
IEEE Access, 2019Co-Authors: Gael Loubet, Alexandru Takacs, Daniela DragomirescuAbstract:This paper addresses the concept of a wirelessly powered and battery-free wireless sensor for the cyber–physical systems dedicated to the structural health monitoring applications in harsh environments. The proposed material architecture is based on a smart mesh wireless sensor network composed of Sensing Nodes and communicating Nodes. The Sensing Nodes are used to sense the physical world. They are battery-free and wirelessly powered by a dedicated radiofrequency source via a far-field wireless power transmission system. The data collected by the Sensing Nodes are sent to the communicating Nodes that, between others, interface the physical world with the digital world through the Internet. A prototype of the Sensing Node—using a LoRaWAN uplink wireless communication and temperature and relative humidity sensor—has been manufactured, and the experiments have been performed to characterize it. The experimental results prove that the periodicity of measurement and communication can be controlled wirelessly by using only the wireless power transmission downlink. In this paper, we highlight the performance of this complete implementation of a wirelessly powered and battery-free wireless Sensing Node—not yet integrated or miniaturized—designed for implementing complete cyber–physical systems and based on the simultaneous wireless information and power transfer. Finally, an investigation of comparable implementations of the battery-free Sensing Nodes for the cyber–physical systems is carried out.
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Towards the Design of Wireless Communicating Reinforced Concrete
IEEE Access, 2018Co-Authors: Loubet Gael, Alexandru Takacs, Daniela DragomirescuAbstract:This paper addresses the concept of a smart-Node wireless network designed for structural health monitoring applications. The network architecture is based on a smart mesh composed of Sensing Nodes and communicating Nodes. The Sensing Nodes are used to implement the so named communicating material/communicating concrete and collect physical data for structural health monitoring purposes. These data are sent to the communicating Nodes that interface the smart-Node network with the digital world through the Internet. The Sensing Nodes are batteryless and wirelessly powered by the communicating Nodes via a wireless power transmission interface. Experimental results have been obtained for a simplified Sensing Node using a LoRaWAN uplink wireless communication (from the Sensing Node to the communicating Node) proving that the functionality of the Sensing Nodes can be controlled wirelessly by using only the wireless power transmission downlink.
Bei Gong - One of the best experts on this subject based on the ideXlab platform.
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A Fast Identity Authentication Solution for the Sensing Layer in Internet of Things
Communications in Computer and Information Science, 2019Co-Authors: Yong Wang, Jia Lou, Bei GongAbstract:Trusted access to the Internet of Things Sensing layer Node is the precondition for the trusted operation of the Internet of Things. How to quickly and accurately implement identity authentication of a Sensing Node is currently a research hotspot. After comprehensive consideration of the security requirements and functional requirements of the Sensing Node Identity Authentication, this paper proposes a fast identity authentication scheme for Sensing Nodes. In the identification process of Sensing Nodes, the data aggregation Node is responsible for the selection of system parameters and the registration of Sensing Nodes. It does not directly participate in the authentication process and simplifies the authentication process. The computational efficiency is high, and the security analysis shows that the scheme has forward security and can resist malicious attacks such as replay attacks, key information disclosure attacks, and forgery attacks. Also, the solution supports key updates. Computational complexity analysis shows that this protocol uses only a small amount of computational complexity in exchange for higher security and more features.
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A trusted attestation mechanism for the Sensing Nodes of Internet of Things based on dynamic trusted measurement
China Communications, 2018Co-Authors: Bei Gong, Xiangang Liu, Fazhi Qi, Yubo Wang, Zhihui SunAbstract:Internet of things has been widely applied to industrial control, smart city and environmental protection, in these application scenarios, Sensing Node needs to make real-time response to the feedback control of the application layer. Therefore, it is necessary to monitor whether or not awareness Nodes are trusted in real time, but the existing mechanisms for trusted certification lack the real-time measurement and tracking of the Sensing Node. To solve the above problems, this paper proposes a dynamic metric based authentication mechanism for Sensing Nodes of Internet of things. Firstly, the dynamic trustworthiness measure of the Sensing Nodes is carried out by introducing the computational function such as the trust function, the trustworthiness risk assessment function, the feedback control function and the active function of the Sensing Node. The dynamic trustworthiness measure of Sensing Nodes from multiple dimensions can effectively describe the change of trusted value of Sensing Nodes. Then, on the basis of this, a trusted attestation based on Node trusted measure is realized by using the revocable group signature mechanism of local verifier. The mechanism has anonymity, unforgeability and traceability, which is proved the security in the standard model. Simulation experiments show that the proposed trusted attestation mechanism is flexible, practical and efficient and has better attack resistance. It can effectively guarantee the reliable data transmission of Nodes and realize the dynamic tracking of Node reliability, which has a lower impact on system performance.
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a remote attestation mechanism for the Sensing layer Nodes of the internet of things
Future Generation Computer Systems, 2018Co-Authors: Bei Gong, Yu Zhang, Yubo WangAbstract:Abstract Trusted transmission of data in Sensing layer is the basis of security of Internet of Things so in data transmission process the trust of Sensing Node needs real-time confirmation and the track of the Node is also needed. But the most current remote attestation mechanisms cannot achieve real-time trust attestation of Sensing Nodes and cannot track the Node, if the Node is an untrusted one, and these mechanisms also have poor environmental adaptability, so the current remote attestation mechanisms are not suitable for the Sensing layer Nodes in the Internet of Things. To solve the above problems, a remote attestation mechanism for the Sensing layer Nodes in the Internet of Things is presented in this paper. Firstly, the formal description of the sensor Nodes is given; secondly, based on the formal description, a real-time trust measurement for the Sensing Nodes is proposed and the real-time trust measurement for the Sensing Nodes is realized; thirdly by encapsulating the properties and trust value of Sensing Node, the real-time tracing of the trust of Nodes are realized in data transmission process. The security of this mechanism is proved in the standard model, meanwhile, this mechanism will not expose the privacy of Nodes in the process of attestation, and it can trace the untrusted Nodes. The simulation experiment shows that this mechanism can resist the attacks to the Sensing Nodes and can effectively improve the trust rate of data transmission, and this mechanism has good dynamic adaptability to network environment. This mechanism is simple and efficient, meanwhile the mechanism is flexible and easy to implement.
Yubo Wang - One of the best experts on this subject based on the ideXlab platform.
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A trusted attestation mechanism for the Sensing Nodes of Internet of Things based on dynamic trusted measurement
China Communications, 2018Co-Authors: Bei Gong, Xiangang Liu, Fazhi Qi, Yubo Wang, Zhihui SunAbstract:Internet of things has been widely applied to industrial control, smart city and environmental protection, in these application scenarios, Sensing Node needs to make real-time response to the feedback control of the application layer. Therefore, it is necessary to monitor whether or not awareness Nodes are trusted in real time, but the existing mechanisms for trusted certification lack the real-time measurement and tracking of the Sensing Node. To solve the above problems, this paper proposes a dynamic metric based authentication mechanism for Sensing Nodes of Internet of things. Firstly, the dynamic trustworthiness measure of the Sensing Nodes is carried out by introducing the computational function such as the trust function, the trustworthiness risk assessment function, the feedback control function and the active function of the Sensing Node. The dynamic trustworthiness measure of Sensing Nodes from multiple dimensions can effectively describe the change of trusted value of Sensing Nodes. Then, on the basis of this, a trusted attestation based on Node trusted measure is realized by using the revocable group signature mechanism of local verifier. The mechanism has anonymity, unforgeability and traceability, which is proved the security in the standard model. Simulation experiments show that the proposed trusted attestation mechanism is flexible, practical and efficient and has better attack resistance. It can effectively guarantee the reliable data transmission of Nodes and realize the dynamic tracking of Node reliability, which has a lower impact on system performance.
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a remote attestation mechanism for the Sensing layer Nodes of the internet of things
Future Generation Computer Systems, 2018Co-Authors: Bei Gong, Yu Zhang, Yubo WangAbstract:Abstract Trusted transmission of data in Sensing layer is the basis of security of Internet of Things so in data transmission process the trust of Sensing Node needs real-time confirmation and the track of the Node is also needed. But the most current remote attestation mechanisms cannot achieve real-time trust attestation of Sensing Nodes and cannot track the Node, if the Node is an untrusted one, and these mechanisms also have poor environmental adaptability, so the current remote attestation mechanisms are not suitable for the Sensing layer Nodes in the Internet of Things. To solve the above problems, a remote attestation mechanism for the Sensing layer Nodes in the Internet of Things is presented in this paper. Firstly, the formal description of the sensor Nodes is given; secondly, based on the formal description, a real-time trust measurement for the Sensing Nodes is proposed and the real-time trust measurement for the Sensing Nodes is realized; thirdly by encapsulating the properties and trust value of Sensing Node, the real-time tracing of the trust of Nodes are realized in data transmission process. The security of this mechanism is proved in the standard model, meanwhile, this mechanism will not expose the privacy of Nodes in the process of attestation, and it can trace the untrusted Nodes. The simulation experiment shows that this mechanism can resist the attacks to the Sensing Nodes and can effectively improve the trust rate of data transmission, and this mechanism has good dynamic adaptability to network environment. This mechanism is simple and efficient, meanwhile the mechanism is flexible and easy to implement.
