Relevant bibliographies by topics / Sensory synchronization

Academic literature on the topic 'Sensory synchronization'

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Published: 7 July 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Journal articles on the topic "Sensory synchronization":

1

Eckhorn, R., H. J. Reitboeck, M. Arndt, and P. Dicke. "Feature Linking via Synchronization among Distributed Assemblies: Simulations of Results from Cat Visual Cortex." Neural Computation 2, no. 3 (September 1990): 293–307. http://dx.doi.org/10.1162/neco.1990.2.3.293.

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We recently discovered stimulus-specific interactions between cell assemblies in cat primary visual cortex that could constitute a global linking principle for feature associations in sensory and motor systems: stimulus-induced oscillatory activities (35-80 Hz) in remote cell assemblies of the same and of different visual cortex areas mutually synchronize, if common stimulus features drive the assemblies simultaneously. Based on our neurophysiological findings we simulated feature linking via synchronizations in networks of model neurons. The networks consisted of two one-dimensional layers of neurons, coupled in a forward direction via feeding connections and in lateral and backward directions via modulatory linking connections. The models' performance is demonstrated in examples of region linking with spatiotemporally varying inputs, where the rhythmic activities in response to an input, that initially are uncorrelated, become phase locked. We propose that synchronization is a general principle for the coding of associations in and among sensory systems and that at least two distinct types of synchronization do exist: stimulus-forced (event-locked) synchronizations support “crude instantaneous” associations and stimulus-induced (oscillatory) synchronizations support more complex iterative association processes. In order to bring neural linking mechanisms into correspondence with perceptual feature linking, we introduce the concept of the linking field (association field) of a local assembly of visual neurons. The linking field extends the concept of the invariant receptive field (RF) of single neurons to the flexible association of RFs in neural assemblies.
2

Gu, Junyi, Artjom Lind, Tek Raj Chhetri, Mauro Bellone, and Raivo Sell. "End-to-End Multimodal Sensor Dataset Collection Framework for Autonomous Vehicles." Sensors 23, no. 15 (July 29, 2023): 6783. http://dx.doi.org/10.3390/s23156783.

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Autonomous driving vehicles rely on sensors for the robust perception of their surroundings. Such vehicles are equipped with multiple perceptive sensors with a high level of redundancy to ensure safety and reliability in any driving condition. However, multi-sensor, such as camera, LiDAR, and radar systems raise requirements related to sensor calibration and synchronization, which are the fundamental blocks of any autonomous system. On the other hand, sensor fusion and integration have become important aspects of autonomous driving research and directly determine the efficiency and accuracy of advanced functions such as object detection and path planning. Classical model-based estimation and data-driven models are two mainstream approaches to achieving such integration. Most recent research is shifting to the latter, showing high robustness in real-world applications but requiring large quantities of data to be collected, synchronized, and properly categorized. However, there are two major research gaps in existing works: (i) they lack fusion (and synchronization) of multi-sensors, camera, LiDAR and radar; and (ii) generic scalable, and user-friendly end-to-end implementation. To generalize the implementation of the multi-sensor perceptive system, we introduce an end-to-end generic sensor dataset collection framework that includes both hardware deploying solutions and sensor fusion algorithms. The framework prototype integrates a diverse set of sensors, such as camera, LiDAR, and radar. Furthermore, we present a universal toolbox to calibrate and synchronize three types of sensors based on their characteristics. The framework also includes the fusion algorithms, which utilize the merits of three sensors, namely, camera, LiDAR, and radar, and fuse their sensory information in a manner that is helpful for object detection and tracking research. The generality of this framework makes it applicable in any robotic or autonomous applications and suitable for quick and large-scale practical deployment.
3

Hirvonen, Jonni, Simo Monto, Sheng H. Wang, J. Matias Palva, and Satu Palva. "Dynamic large-scale network synchronization from perception to action." Network Neuroscience 2, no. 4 (October 2018): 442–63. http://dx.doi.org/10.1162/netn_a_00039.

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Sensory-guided actions entail the processing of sensory information, generation of perceptual decisions, and the generation of appropriate actions. Neuronal activity underlying these processes is distributed into sensory, fronto-parietal, and motor brain areas, respectively. How the neuronal processing is coordinated across these brain areas to support functions from perception to action remains unknown. We investigated whether phase synchronization in large-scale networks coordinate these processes. We recorded human cortical activity with magnetoencephalography (MEG) during a task in which weak somatosensory stimuli remained unperceived or were perceived. We then assessed dynamic evolution of phase synchronization in large-scale networks from source-reconstructed MEG data by using advanced analysis approaches combined with graph theory. Here we show that perceiving and reporting of weak somatosensory stimuli is correlated with sustained strengthening of large-scale synchrony concurrently in delta/theta (3–7 Hz) and gamma (40–60 Hz) frequency bands. In a data-driven network localization, we found this synchronization to dynamically connect the task-relevant, that is, the fronto-parietal, sensory, and motor systems. The strength and temporal pattern of interareal synchronization were also correlated with the response times. These data thus show that key brain areas underlying perception, decision-making, and actions are transiently connected by large-scale dynamic phase synchronization in the delta/theta and gamma bands.
4

Kawasaki, Masahiro, Keiichi Kitajo, and Yoko Yamaguchi. "Sensory-motor synchronization in the brain corresponds to behavioral synchronization between individuals." Neuropsychologia 119 (October 2018): 59–67. http://dx.doi.org/10.1016/j.neuropsychologia.2018.07.026.

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Degardin, A., E. Houdayer, J. L. Bourriez, A. Destée, L. Defebvre, P. Derambure, and D. Devos. "Deficient “sensory” beta synchronization in Parkinson’s disease." Clinical Neurophysiology 120, no. 3 (March 2009): 636–42. http://dx.doi.org/10.1016/j.clinph.2009.01.001.

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Soroush, Ali, Mohammad Akbar, and Farzam Farahmand. "How to Synchronize and Register an Optical-Inertial Tracking System." Applied Mechanics and Materials 332 (July 2013): 130–36. http://dx.doi.org/10.4028/www.scientific.net/amm.332.130.

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Multi-sensor tracking is widely used for augmentation of tracking accuracy using data fusion. A basic requirement for such applications is the real time temporal synchronization and spatial registration of two sensory data. In this study a new method for time and space coordination of two tracking sensor measurements has been presented. For spatial registration we used a body coordinate system and then applied the effect of the level arm. The time synchronization was done based on least mean square (LMS) error method. This method was implemented to synchronize the position and orientation of an object using Inertial ( IMU) and Optical (Optotrak) tracking systems. The results of synchronized data were validated with measurements of Optical tracking system and the mean error of synchronized Euler angles, were less than 0.28 degree.
7

Nacharova, M. A., D. V. Nacharov, and V. B. Pavlenko. "Words Listening Related Electroencephalography Spectrum Perturbations in Normally Developing Children and Sensory Alalia Children." Физиология человека 49, no. 3 (May 1, 2023): 5–12. http://dx.doi.org/10.31857/s0131164622600835.

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The analysis of electroencephalography (EEG) event related spectrum perturbations in 23 normally developing and 23 sensory alalia children of age between 4 and 10 years old during listening to nouns is conducted. In EEG θ-frequency range of healthy children, synchronization was detected in the frontal, central, and temporal leads, and desynchronization was found in most leads in children with sensory alalia. Intergroup differences in the reactivity of the EEG θ-range reached the level of statistical significance in C4 lead. In the α‑range, EEG desynchronization was observed in typically developing children, and synchronization was observed in children with sensory alalia. Differences in the α-activity power reached the level of statistical significance in leads C3, F3, P3, O1. An EEG θ-band synchronization decrease during words listening in children with sensory alalia may reflect an impairment of retrieving words from memory and less emotional involvement in the speech perception process, while the absence of α-activity desynchronization in the central leads is a impairment of the functioning of sensorimotor neural networks, involved in the speech perception and generation. The revealed features of EEG reactivity are important for understanding the central speech perception mechanisms in normal children, as well as in children with disorders such as sensory alalia.
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Fernández-Madrigal, Juan-Antonio, Angeles Navarro, Rafael Asenjo, and Ana Cruz-Martín. "Characterization, Statistical Analysis and Method Selection in the Two-Clocks Synchronization Problem for Pairwise Interconnected Sensors." Sensors 20, no. 17 (August 26, 2020): 4808. http://dx.doi.org/10.3390/s20174808.

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Time synchronization among sensor devices connected through non-deterministic media is a fundamental requirement for sensor fusion and other distributed tasks that need a common time reference. In many of the time synchronization methods existing in literature, the estimation of the relation between pairs of clocks is a core concept; moreover, in applications that do not have general connectivity among its devices but a simple pairwise topology, such as embedded systems, mobile robots or home automation, two-clock synchronization is actually the basic form of the time estimation problem. In these kinds of applications, especially for critical ones, not only the quality of the estimation of the relation between two clocks is important, but also the bounds the methods provide for the estimated values, and their computational effort (since many are small systems). In this paper, we characterize, with a thorough parameterization, the possible scenarios where two-clock synchronization is to be solved, and then conduct a rigorous statistical study of both scenarios and methods. The study is based on exhaustive simulations run in a super-computer. Our aim is to provide a sound basis to select the best clock synchronization algorithm depending on the application requirements and characteristics, and also to deduce which ones of these characteristics are most relevant, in general, when solving the problem. For our comparisons we have considered several representative methods for clock synchronization according to a novel taxonomy that we also propose in the paper, and in particular, a few geometrical ones that have special desirable characteristics for the two-clock problem. We illustrate the method selection procedure with practical use-cases of sensory systems where two-clock synchronization is essential.
9

Veeramuthu, Loganathan, Manikandan Venkatesan, Fang-Cheng Liang, Jean-Sebastien Benas, Chia-Jung Cho, Chin-Wen Chen, Ye Zhou, Rong-Ho Lee, and Chi-Ching Kuo. "Conjugated Copolymers through Electrospinning Synthetic Strategies and Their Versatile Applications in Sensing Environmental Toxicants, pH, Temperature, and Humidity." Polymers 12, no. 3 (March 5, 2020): 587. http://dx.doi.org/10.3390/polym12030587.

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Conjugated copolymers (CCPs) are a class of polymers with excellent optical luminescent and electrical conducting properties because of their extensive π conjugation. CCPs have several advantages such as facile synthesis, structural tailorability, processability, and ease of device fabrication by compatible solvents. Electrospinning (ES) is a versatile technique that produces continuous high throughput nanofibers or microfibers and its appropriate synchronization with CCPs can aid in harvesting an ideal sensory nanofiber. The ES-based nanofibrous membrane enables sensors to accomplish ultrahigh sensitivity and response time with the aid of a greater surface-to-volume ratio. This review covers the crucial aspects of designing highly responsive optical sensors that includes synthetic strategies, sensor fabrication, mechanistic aspects, sensing modes, and recent sensing trends in monitoring environmental toxicants, pH, temperature, and humidity. In particular, considerable attention is being paid on classifying the ES-based optical sensor fabrication to overcome remaining challenges such as sensitivity, selectivity, dye leaching, instability, and reversibility.
10

Bazhenov, M., N. F. Rulkov, and I. Timofeev. "Effect of Synaptic Connectivity on Long-Range Synchronization of Fast Cortical Oscillations." Journal of Neurophysiology 100, no. 3 (September 2008): 1562–75. http://dx.doi.org/10.1152/jn.90613.2008.

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Cortical gamma oscillations in the 20- to 80-Hz range are associated with attentiveness and sensory perception and have strong connections to both cognitive processing and temporal binding of sensory stimuli. These gamma oscillations become synchronized within a few milliseconds over distances spanning a few millimeters in spite of synaptic delays. In this study using in vivo recordings and large-scale cortical network models, we reveal a critical role played by the network geometry in achieving precise long-range synchronization in the gamma frequency band. Our results indicate that the presence of many independent synaptic pathways in a two-dimensional network facilitate precise phase synchronization of fast gamma band oscillations with nearly zero phase delays between remote network sites. These findings predict a common mechanism of precise oscillatory synchronization in neuronal networks.
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Journal articles Dissertations / Theses

Dissertations / Theses on the topic "Sensory synchronization":

1

Cunic, Danny. "Discrimination of motor and sensory processing in human EEG by power and synchronization analysis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0024/MQ50458.pdf.

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Brahimaj, Detjon. "Integrating haptic feedback in smart devices : multimodal interfaces and design guidelines." Electronic Thesis or Diss., Université de Lille (2022-....), 2024. http://www.theses.fr/2024ULILN002.

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L'intérêt croissant pour l'intégration de la rétroaction haptique dans les produits commerciaux est directement lié aux progrès de la technologie haptique. Notamment, la prolifération des smartphones et des tablettes a conduit à l'intégration de modalités haptiques pour diverses fonctions.Alors que des recherches approfondies ont exploré l'intégration des modalités sensorielles (visuelle, auditive, tactile) dans le toucher passif, il existe un manque relatif de connaissances en ce qui concerne la bimodalité ou la multimodalité dans le contexte du toucher actif. Les technologies émergentes, telles que l'haptique de surface, offrent des opportunités pour étudier divers aspects liés à l'intégration sensorielle.Ce travail fournit des lignes directrices précieuses pour les développeurs, tirées d'études expérimentales dans le domaine du toucher actif. Notre première investigation se concentre sur la relation temporelle entre les retours audio et tactiles, révélant un seuil critique de 200 ms lors des interactions de glissement sur une surface haptique. De plus, nous identifions un délai audio-tactile acceptable de 109 ms pour les gestes de clic avec des boutons virtuels, soulignant la nécessité de prohiber ou de minimiser le délai haptique à moins de 40 ms. Une étude comparative impliquant des individus voyants et aveugles dévoile un aspect crucial de l'inclusion : le respect des limites de synchronisation audio-tactile de la population voyante, concerne les boutons virtuels, permet la conception inclusive d'interfaces adaptées aux deux populations. De plus, nous explorons l'impact de facteurs tels que la stéréoscopie et la déformation de surface sur la perception de la rugosité des textures, démontrant que leur présence peut altérer la rugosité perçue des textures lisses de plus de 20%.En outre, notre recherche explore le potentiel de l'utilisation de casques vibrants pour la localisation d'objets, révélant une sensibilité de 7° pour la modalité haptique, de 8° pour la rétroaction auditive et de 6° pour la rétroaction audio-tactile. Cela met en évidence non seulement la viabilité de la rétroaction haptique en réalité virtuelle pour la localisation d'objets, mais aussi l'amélioration obtenue en renforçant l'expérience sensorielle avec des stimuli audio-tactiles
The growing interest in integrating haptic feedback into commercial products is a direct result of advancements in haptic technology. Notably, the proliferation of smartphones and tablets has led to the integration of haptic modalities for various interfaces.While extensive research has explored the integration of sensory modalities (visual, auditory, tactile) in passive touch, there is a relative dearth of knowledge regarding bimodality or multimodality in the context of active touch. Emerging technologies, like surface haptics, offer opportunities to investigate various aspects related to sensory integration.This work provides valuable guidelines for developers, drawing from experimental studies in the realm of active touch. Our initial investigation focuses on the temporal relationship between audio and tactile feedback, revealing a critical 200 ms threshold during sliding interactions on a haptic surface. Moreover, we identify an acceptable audio-tactile delay of 109 ms for click gestures with virtual buttons, emphasizing the need to prohibit or minimize haptic delay to less than 40 ms. A comparative study involving sighted and blind individuals unveils a crucial aspect of inclusion: adhering to synchronization boundaries of the sighted population, relative to virtual buttons, allows for the inclusive design of interfaces accommodating both populations.Additionally, we explore the impact of factors such as stereoscopy and surface deformation on the perception of texture roughness, demonstrating that their presence can alter the perceived roughness of smooth textures by over 20%.Furthermore, our research explores the potential of using vibration headphones for object localization, revealing a sensitivity of 7° for the haptic modality, 8° for auditory feedback, and 6° for audio-tactile. This highlights not only the viability of haptic feedback in virtual reality for object localization but also the improvement achieved by reinforcing the sensory experience with audio-tactile stimuli
3

Pallarés, Valls Oriol. "Time synchronization in underwater acoustic sensor networks." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/403876.

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This thesis deals with the development of a time synchronization algorithm for underwater sensor networks. The ease of deployment and maintenance of wireless networks leaded this research to the use of an acoustic communication sensor network to share a common base time between all nodes. Acoustic signals are well adapted to the underwater medium but experience very challenging impairments such as Doppler, extensive multi-paths and low transmission speed that can nevertheless be corrected at the reception side. Several acoustic waveforms can be invoked to transmit digital data through the underwater medium, without loss of generality, in this study is considered Orthogonal Frequency- Division Multiplexing (OFDM) communication scheme to exchange data between wireless underwater nodes containing sensor time references. This communication link will be used among others to carry time stamp message required for network synchronization. Time synchronization is a critical piece of infrastructure of any distributed system. UWSN make extensive use of synchronized time for many services provided by a distributed network. In UWSN, Global Positioning System (GPS) signals are not available and synchronization systems are mostly based on acoustic communication. Owing to high latency of the underwater acoustic transmission channel with respect to cabled or radio network makes the use of conventional synchronization protocols even more challenging underwater. Many time synchronization algorithms for underwater wireless sensor networks (UWSN) can be found in literature, such as TSHL, D-SYNC, DA-Sync. but only a few of them take into account all the water channel challenges, such as low available bandwidth, long propagation delays and sensor node mobility. To solve this problem, in this research a further development of the existing time synchronization protocols found in literature is driven. To perform time synchronization we apply Precision Time Protocol (PTP) std. IEEE 1588, which is capable to synchronize two clocks with a precision below hundreds of nanoseconds in a point to point cabled Ethernet Network, and DA-Sync protocol, which is a bidirectional message exchange based method between a master clock and an slave one, and refines its time synchronization parameters by using medium kinematic models. In cabled synchronization systems, such as PTP, time stamps are acquired in physical layer (PHY) in order to achieve maximum precision, avoiding indeterministic time like Operating System (OS) time slots or medium access protocols. Analogously, it happens in acoustic communication, time stamps are extracted from a large acquisition window, and the improvement of these time stamps is treated in this thesis. Contrary to cable networks, the low celerity of wave sound makes underwater acoustic communications system very sensitive to Doppler effect, yielding to non-uniform frequency scaling represented by compression or dilatation of the time axis. This frequency scaling can be induced by two factors: motion (sensor mobility, channel variation, etc...) and clock skew receiver between transmitter and receiver. Actually, in order to address this problem, some systems uses expensive inertial sensors for compensating Doppler scaling due to motion and temperature compensated low drift clocks. So in this thesis is evaluated the Doppler scaling caused by motion and skew in order to correct it. Finally, several tests in the laboratory, test tank, and at sea are performed in order to check the performance of acoustic communication and time synchronization. Results show a correct behavior of hardware and software, and also validate the performance of the time synchronization applied to acoustic UWSN.
La sincronización temporal es una pieza clave de cualquier sistema distribuido. Las redes de sensores submarinas hacen uso de los sistemas de sincronización entre nodos para diversos servicios disponibles en cualquier red distribuida. Cabe mencionar que en las redes submarinas, las señales GPS (Global Positioning System) no están disponibles para la referencia temporal, y los sistemas de sincronización se tienen que basar principalmente en comunicaciones acústicas. Además, debido a la alta latencia de dichas redes, la portabilidad de protocolos de sincronización cableados o terrestres, es prácticamente imposible debido a las grandes diferencias de velocidades de propagación de las ondas electromagnéticas frente a las acústicas en el medio marino. Las señales acústicas se adecúan bien al medio submarino, pero presentan una serie de inconvenientes como el efecto Doppler, largas trayectorias multi-camino, además de una velocidad de transmisión baja, que han de ser corregidos en el equipo receptor. Se ha elegido el uso de "Orhtogonal Frequency-Division Multiplexing" (OFDM) como esquema de comunicaciones para el intercambio de datos entre nodos inalámbricos que tienen las bases temporales de cada uno de sus sensores. Este link de comunicaciones será usado, entre otros, para propagar los marcajes de tiempos entre mensajes necesarios para la sincronización de la red. En la literatura se pueden encontrar varios sistemas de sincronización para redes de sensores submarinas basadas en comunicación acústica como TSHL, D-SYNC, DA-Sync, pero sólo unos pocos tienen en cuenta toda la problemática del medio marino, como el bajo ancho de banda, los largos tiempos de propagación, o la movilidad de los sensores. Para resolver esta problemática de la sincronización temporal se ha empleado como referencia "Precision Time Protocol" (PTP) std. IEEE 1588, el cual es capaz de sincronizar dos relojes en una red cableada punto a punto con una precisión por debajo de los centenares de nanosegundos. Además se han empleado sistemas de mejora de la precisión temporal basados en ecuaciones cinemáticas de los nodos, tal y como se presenta en el estudio DA-Sync. En el protocolo PTP, los marcajes de tiempo se realizan en la capa física con el propósito de lograr la mayor precisión posible, ya que de este modo se evitan incertidumbres debidas a las temporizaciones de los sistemas operativos, o los algoritmos de acceso al medio. Análogamente, en esta tesis se presenta un sistema de marcaje de tiempos que extrae mediante hardware el marcaje temporal del inicio de la adquisición de datos. Difiriendo de las redes cableadas, la baja velocidad de propagación de las ondas acústicas en el medio marino hace que la comunicación sea altamente sensible al efecto Doppler, resultando en escalados frecuenciales no uniformes, que afectan a la base temporal dilatándola o comprimiéndola. Este escalado de frecuencia puede deberse a dos factores: movimiento (movimiento de sensores, variaciones del canal, etc.) o derivas del reloj de un nodo frente a otro nodo. Actualmente, para resolver este problema, algunos sistemas utilizan sistemas inerciales muy costosos para estimar el movimiento del sensor y relojes compensados por temperatura. En esta tesis se ha utilizado la información del canal respecto al escalado Doppler, además de las ecuaciones cinemáticas de primer orden, para estimar la movilidad y la deriva de los relojes. Finalmente, varios tests en laboratorio, tanque de agua, y experimentación en el mar son presentados para verificar el correcto funcionamiento de ambos sistemas de comunicación y sincronización. Los resultados validan el funcionamiento de todos los algoritmos software y del hardware, además de verificar el funcionamiento del sistema de sincronización aplicado a redes de sensores submarinas con comunicación acústica.
4

Yang, Ying. "Time Synchronization in Wireless Sensor Networks：A Survey." Thesis, Mittuniversitetet, Institutionen för informationsteknologi och medier, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-16986.

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Wireless sensor networks (WSNs) have been used as an important tool inmany fields of science and industry. Time synchronization is also a criticalissue in wireless sensor networks and its aim is to synchronize the local timefor some or all nodes in the network, if necessary. However, wireless sensornetworks are limited in their accuracy, energy efficiency, scalability, and complexityand some traditional time synchronization algorithms such as NetworkTime Protocol (NTP) and Global Positioning System (GPS) are unsuitable forWSNs. This work surveys and evaluates state-of-art time synchronization protocolsbased on many factors including accuracy, energy efficiency, and complexity,and analyzes the effect that time synchronization has in a wirelesssensor network. IN ADDITION, more attention is paid to several time synchronizationalgorithms and their advantages and disadvantages. Also, the surveyprovides a valuable framework for comparing new and existing synchronizationprotocols. According to the evaluation for the performance of time synchronizationalgorithms, this thesis provides assistance in relation to further improvingthe performance of time synchronization. Finally, future research directionsin relation to time synchronization in wireless sensor networks are alsoproposed.
5

Luo, Bin, and 羅斌. "Distributed clock synchronization for wireless sensor networks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/198812.

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Clock synchronization for Wireless Sensor Networks (WSNs) has attracted lots of attention due to its importance for operations in WSNs. In traditional centralized clock synchronization algorithms, all the local information should be transmitted to a fusion center for processing, and the results need to be forwarded back to each individual sensor, thus resulting in a heavy burden on communication and computation in the network. In addition, it also lacks of adaptability to link failures and dynamic changes in the network topology, which greatly prevents their use in WSNs. Hence, in this thesis, we focus on developing energy-efficient distributed clock synchronization algorithms for WSNs. Firstly, global clock synchronization problem is investigated with time-varying clock parameters (skew and offset) owing to imperfect oscillator circuits. A distributed Kalman filter is developed for clock parameters tracking. The proposed algorithm only requires each node to exchange limited information with its direct neighbors, thus is energy efficient, scalable with network size, and is robust against changes in network connectivity. A low-complexity distributed algorithm based on Coordinate-Descent with Bootstrap (CD-BS) is also proposed to provide rapid initialization of the tracking algorithm. Simulation results show that the proposed distributed tracking algorithm achieves the long-term accuracy for the clock parameters close to the Bayesian Cramer-Rao Lower Bound. Secondly, the problem of global clock synchronization for WSNs in the presence of unknown exponential delays is studied. The joint maximum likelihood estimator of clock offsets, clock skews and fixed delays of the network is first formulated as a global linear programming (LP) problem. Based on the Alternating Direction Method of Multipliers (ADMM), we propose a fully-distributed synchronization algorithm that has low communication overhead and computation cost. Simulation results show that the proposed algorithm achieves better accuracy than consensus algorithm and the distributed least squares algorithm, and can always converge to the centralized optimal solution. Finally, global clock synchronization for WSNs under the exponentially distributed delays is re-visited with the fast convergence min-sum algorithm. The synchronization problem is cast into an optimization problem represented by factor graph, and a closed-form expression of the messages passed between nodes are derived. Simulation results show that this distributed algorithm can approach the centralized LP solution with faster convergence speed compared to ADMM-based algorithm.
published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
6

Deconda, Keerthi. "Fault tolerant pulse synchronization." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2331.

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Johansson, Malin. "Synchronization of Acoustic Sensors in a Wireless Network." Thesis, Linköpings universitet, Datorteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157765.

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Geographically distributed networks of acoustic sensors can be used to identify and localize the origin of acoustic phenomena. One area of use is localization of snipers by detecting the bullet's shock wave and the muzzle blast. At FOI Linköping, this system is planned to be adapted from a wire bounded sensor network into a wireless sensor network (WSN). When changing from wire bounded communication to wireless, the issue of synchronization becomes present. Synchronization can be achieved in multiple ways with different benefits depending of the method of choice. This thesis studies the synchronization method of using the highly accurate clock in Global Navigation Satellite System (GNSS) modules. This synchronization method is developed into an independent time stamping device that can be connected to each sensor in the WSN. This ensure that all sensors are synchronized to Coordinated Universal Time (UTC). The thesis starts with a pre-study where different solutions are investigated and evaluated. After the pre-study, a development stage is begun where the best solution is developed into a model to be easily implemented in the future. The result is a model existing of a microcontroller, a timing module and an ADC with built in filter and amplification.
8

Saravanos, Yanos. "Energy-Aware Time Synchronization in Wireless Sensor Networks." Thesis, University of North Texas, 2006. https://digital.library.unt.edu/ark:/67531/metadc5438/.

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I present a time synchronization algorithm for wireless sensor networks that aims to conserve sensor battery power. The proposed method creates a hierarchical tree by flooding the sensor network from a designated source point. It then uses a hybrid algorithm derived from the timing-sync protocol for sensor networks (TSPN) and the reference broadcast synchronization method (RBS) to periodically synchronize sensor clocks by minimizing energy consumption. In multi-hop ad-hoc networks, a depleted sensor will drop information from all other sensors that route data through it, decreasing the physical area being monitored by the network. The proposed method uses several techniques and thresholds to maintain network connectivity. A new root sensor is chosen when the current one's battery power decreases to a designated value. I implement this new synchronization technique using Matlab and show that it can provide significant power savings over both TPSN and RBS.
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Ying, Yeqiu. "Synchronization and data detection in wireless sensor networks." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485187.

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Wireless'sensor networks (WSNs) have been envisioned as one of the most 'important emerging technologies that can greatly impact the world. With the recent advancement in both electronics and wireless communication networks, implementing WSNs in practical applications has become feasible and can be expected.in the near future. However, current communications protocols are not suitable for use in WSNs due to the unique characteristics and the system constraints such as low power consumption, and low computational and hardware complexity. '\. In this thesis, we focus on the physical (PRY) layer design issues including . transmission medium selection, and transceiver design. Specifically, we first study a WSN architecture with a centralized topology. Motivated by the factor that if not properly treated, carrier frequency offset (CFO) and multipath channel can cause great degradation of data detection performance in conventional carrier-based radio systems (narrow-band and wide-band systems), we address CFO and channel estimation for multiple slave sensor nodes. Relying on a unique TDMA-like training head pattern, the joint multi-user CFO and channel estimation problem can be easily decoupled. Furthermore, the joint CFO and channel estimation for each slave sensor can also be treated separately without significant performance degradation. Different CFO and channel estimators are derived and compared. Optimal training design, specifically the pilot symbols placement, for burst transmission systems is also investigated, and an equal-preamble-postamble (EPP) placement scheme is shown to be optimal. In the second half of the thesis, the emerging ultra-wideband (UWB) radio technology is investigated in the context of WSNs. We believe that this new radio technology is a strong candidate for WSN applications d?e to its unique advantages. The modulation ~d receiver schemes are stqdied and block-coded modulation and a novel noncoherent receiver are proposed for impulse radio (IR) UWB systems. The critical challenge of timing synchronization for IR-UWB signals is also studied, and a new code-assisted synchronization scheme is proposed. This semi-analog based synchronization scheme enables the usage of both coherent and noncoherent receivers, and can be executed under either blind or data-aided mode. In conclusion, this research work is expected to favorably impact the theory, design and implementation of communication transceivers for practical W8Ns.
10

Han, Cheng-Yu. "Clock Synchronization and Localization for Wireless Sensor Network." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS453/document.

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Les réseaux de capteurs sans fil (WSN) jouent un rôle important dans des applications telles que la surveillance de l'environnement, le suivi de sources et le suivi médical, ...etc. Dans les WSN, les capteurs ont la capacité d'effectuer l'échantillonnage des données, des calculs distribués et de fusionner des données. Pour effectuer ces tâches complexes, la synchronisation des horloges et la localisation sont fondamentales et essentielles. Les WSN ont été largement étudiés ces dernières années et la littérature scientifique rapporte de nombreux résultats qui les rendent applicables pour de nombreuses applications. Pour d'autres, la recherche doit encore trouver des solutions à certains des défis posés par la limitation énergétique, la dynamicité et la faible puissance de calcul. Dans le but de contribuer à la recherche sur les WSN, cette thèse propose de nouveaux algorithmes pour la synchronisation d'horloge et la localisation. La synchronisation d'horloge est nécessaire afin que les effectuent de manière efficace la fusion de données. En appliquant l'algorithme de synchronisation d'horloge, les capteurs établissent un consensus temporel et travaillent donc au même rythme. Compte tenu de la dynamicité, des faibles capacités de calcul et de la parcimonie des WSN, un nouvel algorithme de synchronisation décentralisée à impulsions couplées est proposé pour améliorer la précision de la synchronisation. L'avantage de ce type d'algorithme est que les capteurs échangent des impulsions au lieu de paquets, de sorte que non seulement la communication est efficace, mais aussi robuste à toute défaillance des capteurs dans le réseau. La localisation de capteurs a été largement étudiée dans la littérature scientifique. Cependant, la qualité et la précision de la localisation peuvent encore être améliore. Cette thèse applique l'algorithme LSCR (Régression de régions corrélées à signes dominants) au problème de localisation. Avec LSCR, on évalue des régions de confiance avec des niveaux de confiance prescrits, qui fournissent non seulement on emplacement mais aussi la confiance en cet emplacement. Dans cette thèse, plusieurs approches de localisation sont implémentées et comparées. Le résultat de la simulation montre que, sous hypothèses modérées, LSCR obtient des résultats compétitifs par rapport à d'autres méthodes
Wireless sensor networks (WSNs) play an important role in applications such as environmental monitoring, source tracking, and health care,... In WSN, sensors have the ability to perform data sampling, distributed computing and information fusion. To perform such complex tasks, clock synchronization and localization are two fundamental and essential algorithms. WSNs have been widely studied in the past years, and the scientific literature reports many outcomes that make them applicable for some applications. For some others, research still needs to find solutions to some of the challenges posed by battery limitation, dynamicity, and low computing clock rate. With the aim of contributing to the research on WSN, this thesis proposes new algorithms for both clock synchronization and localization. For clock synchronization, sensors converge their local physical clock to perform data fusion. By applying the clock synchronization algorithm, sensors converge the time difference and therefore work at the same rate. In view of dynamicity, low computing and sparsity of WSN, a new pulse-coupled decentralized synchronization algorithm is proposed to improve the precision of the synchronization. The benefit of this kind of algorithm is that sensors only exchange zero-bit pulse instead of packets, so not only the communication is efficient but also robust to any failure of the sensors in the network. Localization of sensors has been widely studied. However, the quality and the accuracy of the localization still have a large room to improve. This thesis apply Leave-out Sign-dominant Correlated Regions (LSCR) algorithm to localization problem. With LSCR, one evaluates the accurate estimates of confidence regions with prescribed confidence levels, which provide not only the location but also the confidence of the estimation. In this thesis, several localization approaches are implemented and compared. The simulation result shows under mild assumptions, LSCR obtains competitive results compared to other methods
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Books on the topic "Sensory synchronization":

1

Serpedin, Erchin. Synchronization in wireless sensor networks: Parameter estimation, performance benchmarks, and protocols. Cambridge: Cambridge University Press, 2009.

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Poovendran, Radha, Sumit Roy, and Cliff Wang, eds. Secure Localization and Time Synchronization for Wireless Sensor and Ad Hoc Networks. Boston, MA: Springer US, 2007. http://dx.doi.org/10.1007/978-0-387-46276-9.

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Serpedin, Erchin, and Qasim M. Chaudhari. Synchronization in Wireless Sensor Networks: Parameter Estimation, Performance Benchmarks, and Protocols. Cambridge University Press, 2012.

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Serpedin, Erchin, and Qasim M. Chaudhari. Synchronization in Wireless Sensor Networks: Parameter Estimation, Performance Benchmarks, and Protocols. Cambridge University Press, 2009.

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Serpedin, Erchin, and Qasim M. Chaudhari. Synchronization in Wireless Sensor Networks: Parameter Estimation, Performance Benchmarks, and Protocols. Cambridge University Press, 2009.

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Serpedin, Erchin, and Qasim M. Chaudhari. Synchronization in Wireless Sensor Networks: Parameter Estimation, Performance Benchmarks, and Protocols. Cambridge University Press, 2009.

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Wang, Cliff, Radha Poovendran, and Sumit Roy. Secure Localization and Time Synchronization for Wireless Sensor and Ad Hoc Networks. Springer, 2010.

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Wang, Cliff, Radha Poovendran, and Sumit Roy. Secure Localization and Time Synchronization for Wireless Sensor and Ad Hoc Networks. Springer, 2007.

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(Editor), Radha Poovendran, Cliff Wang (Editor), and Sumit Roy (Editor), eds. Secure Localization and Time Synchronization for Wireless Sensor and Ad Hoc Networks (Advances in Information Security). Springer, 2006.

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Book chapters on the topic "Sensory synchronization":

1

Moss, Frank E., and Hans A. Braun. "Unstable Periodic Orbits and Stochastic Synchronization in Sensory Biology." In The Science of Disasters, 310–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-56257-0_10.

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Zang, Beibei, Tianjun Wang, and Dan Luo. "The Embodied Interaction with XR Metaverse Space Based on Pneumatic Actuated Structures." In Computational Design and Robotic Fabrication, 190–200. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8405-3_16.

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AbstractThis paper is based on our exploration of building an integrated-sensory XR interactive system breaking through the sensory boundary between physical environment and metaverse via pneumatic wearables. In short, our exploration mainly focuses on the following two aspects. Firstly, this research has adapted pneumatic-actuated wearable devices to satisfy the needs of clothing comfort and embodied interaction concurrently by exploring the downsized body-scale pneumatic system and programmable soft materials. Secondly, this research explores the possibility of using digital wearables as the linkage of physical body and XR metaverse to enrich the interaction between XR metaverse and physical environment, aiming at the real-time synchronization of physical wearer's and his virtual avatar in XR system.
3

Baird, Bill, Todd Troyer, and Frank Eeckman. "Attention as Selective Synchronization of Oscillating Cortical Sensory and Motor Associative Memories." In The Neurobiology of Computation, 167–72. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-2235-5_27.

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Agrawal, Dharma Prakash. "Clock Synchronization and Localization." In Embedded Sensor Systems, 121–38. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3038-3_5.

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Becker, Stina, Tim Schrills, and Thomas Franke. "Social Presence Despite Isolation - Insights into the Relation Between Psychological Distance and Sensory Synchronization in Computer-Mediated Communication." In Proceedings of the 21st Congress of the International Ergonomics Association (IEA 2021), 145–53. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74605-6_18.

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Su, Weilian. "Time-Synchronization Challenges and Techniques." In Wireless Sensor Networks and Applications, 219–33. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-49592-7_9.

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Römer, Kay, Philipp Blum, and Lennart Meier. "Time Synchronization and Calibration in Wireless Sensor Networks." In Handbook of Sensor Networks, 199–237. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/047174414x.ch7.

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Zhang, Ying. "Synchronization Accuracy in Wireless Sensor Networks." In Lecture Notes in Electrical Engineering, 187–92. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4853-1_24.

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Fernández Anta, Antonio, Miguel A. Mosteiro, and Christopher Thraves. "Deterministic Recurrent Communication and Synchronization in Restricted Sensor Networks." In Algorithms for Sensor Systems, 62–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16988-5_6.

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Beauquier, Joffroy, and Janna Burman. "Self-stabilizing Synchronization in Mobile Sensor Networks with Covering." In Distributed Computing in Sensor Systems, 362–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13651-1_26.

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Conference papers on the topic "Sensory synchronization":

1

ŠILJAK, HARUN, and BISWAJIT BASU. "NATURAL SYNCHRONIZATION OF WIRELESS SENSOR NETWORKS FOR STRUCTURAL HEALTH MONITORING." In Structural Health Monitoring 2021. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/shm2021/36278.

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Time synchronization in communication networks is a common issue: in a sensor network it means that the order of data samples becomes uncertain, which can make it unusable. Dedicated signals and schemes for synchronization of sensor networks has hence been a well-researched topic for decades. Here we bring in an approach to synchronization which uses the sensory data. Drawing inspiration from sensor time synchronization using environmental noise, we consider synchronizing sensory nodes for structural health monitoring–if the physical quantity the sensors measure is correlated, propagating as a wave, or oscillating in regular fashion, it is intuitively clear how to put it to use. We discuss when structural health monitoring signals can aid synchronization; we also connect this synchronization scheme to the idea of using physical human-made structures as reservoirs for reservoir computing, formulating synchronization as a reservoir computing task.
2

Latifzadeh, Kayhan, and Luis A. Leiva. "Gustav: Cross-device Cross-computer Synchronization of Sensory Signals." In UIST '22: The 35th Annual ACM Symposium on User Interface Software and Technology. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3526114.3558723.

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Abreu, Raphael, Joel dos Santos, and Eduardo Bezerra. "A Bimodal Learning Approach to Assist Multi-sensory Effects Synchronization." In 2018 International Joint Conference on Neural Networks (IJCNN). IEEE, 2018. http://dx.doi.org/10.1109/ijcnn.2018.8489357.

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Abreu, Raphael, Douglas Mattos, Joel A. F. dos Santos, and Débora C. Muchaluat-Saade. "Semi-automatic synchronization of sensory effects in mulsemedia authoring tools." In WebMedia '19: Brazilian Symposium on Multimedia and the Web. New York, NY, USA: ACM, 2019. http://dx.doi.org/10.1145/3323503.3360302.

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Rodrigues, Renato de Oliveira, Marina I. P. Josué, Raphael S. Abreu, Glauco F. Amorim, Debora C. Muchaluat-Saade, and Joel A. F. dos Santos. "A Proposal for Supporting Sensory Effect Rendering in Ginga-NCL." In XXV Simpósio Brasileiro de Sistemas Multimídia e Web. Sociedade Brasileira de Computação - SBC, 2019. http://dx.doi.org/10.5753/webmedia_estendido.2019.8161.

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This contribution proposes an extension to middleware Ginga- NCL as a way to provide a declarative approach for the creation and execution of interactive mulsemedia applications. It enables the author to create mulsemedia applications in NCL, defining sensory effects as nodes. Therefore, one is able to reuse all the language support for content synchronization, user interaction, context adaptation, etc.
6

Rao, A. Ravishankar. "The modulation of synchronization by tuning functions and its effect on multi-sensory perception." In 2017 International Joint Conference on Neural Networks (IJCNN). IEEE, 2017. http://dx.doi.org/10.1109/ijcnn.2017.7965920.

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Wang, Pingfeng, Adebayo O. Adewunmi, and Zequn Wang. "Evolving Design Model Synchronization for System Health Management Using Laplace Approximation." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34552.

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Lifecycle health management plays an increasingly important role in realizing resilience of aging complex engineered systems since it detects, diagnoses, and predicts system-wide effects of adverse events, therefore enables a proactive approach to deal with system failures. To address an increasing demand to develop high-reliability low-cost systems, this paper presents a new platform for operational stage system health management, referred to as Evolving Design Model Synchronization (EDMS), which enables health management of aging engineered systems by efficiently synchronizing system design models with degrading health conditions of actual physical system in operation. A Laplace approximation approach is employed for the design model updating, which can incorporate heterogeneous operating stage information from multiple sources to update the system design model based on the information theory, thereby increases the updating accuracy compared with traditionally used Bayesian updating methodology. The design models synchronized over time using sensory data acquired from the system in operation can thus reflect system health degradation with evolvingly updated design model parameters, which enables the application of failure prognosis for system health management. One case study is used to demonstrate the efficacy of the proposed approach for system health management.
8

Senel, Numan, Gordon Elger, and Andreas Festag. "Sensor Time Synchronization in Smart Road Infrastructure." In FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-acm-083.

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In smart cities, infrastructure-side sensors are already used to increase safety, to mitigate traffic congestion and to reduce pollution caused by vehicles. In the future, infrastructural safeguarding is expected to get a large potential due to availability of advanced infrastructure sensors (camera,radar,lidar) and vehicle-to-infrastructure (V2I) communications. In principle, installations of infrastructure-side sensor systems can be divided into two main categories as temporary and permanent. Permanent systems are typically installed for highly used part of urban environments such as city centers, whereas temporary systems are setup for events in cities (concerts,sports games,etc.) with a temporally high density of traffic participants. For both categories different networking options (wired,wireless) as well as sensor data fusion methods (centralized, decentralized data fusion) are possible in order to meet requirements of the specific use case. In this paper, we consider two main architecture options: (1) wired networking with centralized data fusion (centralize architecture) and (2) wireless networking with decentralized data fusion (decentralized architecture). In the centralized network architecture, the we assume that raw data from multiple sensors will be transmitted to a central processor unit (master). In this architecture, a single node handles the data processing and the fusion process. In the decentralized network architecture, every sensor is equipped with a computing and a communication component. Sensors use a co-located processor unit (slave) to, preprocess data and to transmit these data to a master node. In both architecture options, the master node will be responsible for combining all inputs from multiple sensors to form a common estimate for future state. A centralized architecture requires high-bandwidth connectivity between the sensors and the master, whereas the preprocessing in the decentralized approach has lower demands on the networking bandwidth. Considering the two architectures the synchronization of the sensor time strongly impacts the state estimation. Sensor nodes need to synchronize their operation and collaborate to accomplish the sensing task. For example, in order to track a vehicle, sensors need to report the location and detection time of vehicle to master node. Then, the master node combines the information to estimate the location and velocity of the vehicle. Evidently, if the sensors do not have a common timescale, the state estimation will be inaccurate. Other aspect is how old the fused data (estimation) are before it delivered to road participants. When road participants receive a current estimation at the timestamp T2, these data represent state at time T1. The time difference between T1 and T2 depends on primarily on the network delay and process time of sensor data. For performance evaluation of the network options with respect to time synchronization the data processing will be separated as an additional source of delay. In this paper, we study the two architecture options for a smart road infrastructure. The study is based on prototype system using the Robot Operating System (ROS) and cameras, whereas also other sensors (radar,LiDAR) are considered. We specifically assess the impact of sensor time synchronization on the reliability of the sensor data fusion and evaluate the latency between the acquisition of sensor data and reception of the data by the road participants.
9

Seo, Duck-Bong, and Z. C. Feng. "Synchronization in Dual Delay Line SAW Sensors." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59979.

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Surface acoustic wave (SAW) sensors are self-excited oscillators. Self-excitation is a consequence of the finite amount of delay in the circuit. The oscillation frequency is affected by the wave propagation speed which further depends on surface adsorption. Therefore, measurement on the surface adsorption is done by measuring the frequency change of the self-excited oscillation. In dual delay line oscillators the difference between the surface physical conditions is reflected through the difference in oscillation frequencies. Delay differential equations are used to model the sensor. Bifurcation analysis of the averaged equations indicates the presence of synchronization. The occurrence of synchronization is further demonstrated through numerical simulations. Synchronization makes the frequency measurement irrelevant. We propose phase measurement as an alternative in the presence of strong coupling between the two oscillators.
10

Rusch, Tobias, Benjamin Hübner, Silja Meyer-nieberg, Wolfgang Winter, Armin Leopold, Marko Hofmann, and Cornelia Küsel. "Physiological and psychological performance measurement for the practical driving test." In 15th International Conference on Applied Human Factors and Ergonomics (AHFE 2024). AHFE International, 2024. http://dx.doi.org/10.54941/ahfe1005229.

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Even with the advancement of automobile technologies supporting drivers in most situations on the road, the practical driving test required to obtain a driver’s license in Germany is still a major obstacle for students. Although additional tools such as driving simulation systems as well as mobile apps are available for initial driving training, the failure rate stagnated around 37% for the last ten years, according to the ADAC, the largest german automobile club. In Germany, students learn to drive with the help of private companies specialized on teaching and leading the students up to the official practical driving test demanded by government regulations to obtain a driver’s license.Using a multimodal sensory setup obtaining biophysiological and derived mental state data of each driving student, the resulting database is used to identify possible causes about fatal driving errors. Each student is evaluated and accompanied throughout his or her entire learning journey, starting with a questionnaire-based personality trait test. Using synchronization by timestamp, the biophysiological data most related to stress, such as HRV, EDA or eye tracking, are collected both while within the driving simulation system and on the real-world road. Besides collected sensor-based data, the database is also enriched with subjective insights provided by the student before and after each driving session. On the road, the driving instructor assessment, a standardized driving log, containing special events and student behaviour, as well as an event-synchronized video recording is added to each dataset. For analysis of the collected data, particular attention is paid to anomalies correlated to special events during each session to identify situational patterns which may be associated to an increased failure rate in the final, official practical driving test. The gained insights are then used to optimize driving training to actively reduce the practical driving test failure rate.

Reports on the topic "Sensory synchronization":

1

Nooshabadi, Saeid. ADAPTable Sensor Systems Phase 2. Topic 2: Reusable Core Software. Distributed Synchronization Software for the Sensor Nodes. Fort Belvoir, VA: Defense Technical Information Center, March 2015. http://dx.doi.org/10.21236/ada619961.

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FEASIBILITY STUDY ON AN OPTICAL STRAIN GAGE BASED ON FLUORESCENCE RESPONSE OF GRAPHENE QUANTUM DOTS. The Hong Kong Institute of Steel Construction, June 2024. http://dx.doi.org/10.18057/ijasc.2024.20.2.5.

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In this study, based on the excellent fluorescence properties of graphene quantum dots (GQDs) and their good response to mechanical effects, the GQDs were mixed with epoxy resin to make a coating sensor. Taking this as the research object, the film was coated on the Q235 tensile steel sample, which can dynamically monitor the stress and strain of the steel sample. By investigating the effects of the concentration of the GQDs solution, the synchronization of the film and the steel component, and the residual stress of the epoxy resin, the mechanism of the visual fluorescence signal was analyzed. The response of stress-strain of steel sample and the fluorescence intensity of coating sensor under uniaxial tension and cyclic loading were studied. The test results showed that the synthesized coating sensor had good stability and can produce very sensitive fluorescence response to the stress and strain. The fluorescence intensity of the coating sensor increased with the increase of stress and strain, and decreased with the decrease of stress and strain under cyclic loading, which had the potential to act as a new optical strain gauge. Based on the test results, the stress and strain of the GQDs-epoxy resin composites coated on tensile steel samples with different thicknesses were studied by numerical simulation.

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