Relevant bibliographies by topics / Temporal summation

Academic literature on the topic 'Temporal summation'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Temporal summation"

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Krakau, C. E. T. "Temporal Summation and Perimetry." Ophthalmic Research 21, no. 1 (1989): 49–55. http://dx.doi.org/10.1159/000266767.

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A. Gescheider, George, Marian E. Berryhill, Ronald T. Verrillo, and Stanley J. Bolanowski. "Vibrotactile temporal summation: probability summation or neural integration?" Somatosensory & Motor Research 16, no. 3 (January 1999): 229–42. http://dx.doi.org/10.1080/08990229970483.

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Gerken, George M., Vishwa K. H. Bhat, Margaret Hutchison‐Clutter, and Karen L. Donnelly. "Auditory temporal summation in humans." Journal of the Acoustical Society of America 80, S1 (December 1986): S93. http://dx.doi.org/10.1121/1.2024049.

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Ghoul, Asila, Marla M. Holt, Colleen Reichmuth, and David Kastak. "Auditory temporal summation in pinnipeds." Journal of the Acoustical Society of America 125, no. 4 (April 2009): 2676. http://dx.doi.org/10.1121/1.4784213.

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Curatolo, M., S. Petersen-Felix, L. Arendt-Nielsen, M. Fischer, and A. M. Zbinden. "Temporal summation during extradural anaesthesia." British Journal of Anaesthesia 75, no. 5 (November 1995): 634–35. http://dx.doi.org/10.1093/bja/75.5.634.

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Mulligan, J. B., and M. T. Trujillo. "Temporal summation in trajectory perception." Journal of Vision 6, no. 6 (March 18, 2010): 1082. http://dx.doi.org/10.1167/6.6.1082.

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CURATOLO, M., S. PETERSEN-FELIX, L. ARENDT-NIELSEN, and A. M. ZBINDEN. "Temporal summation after spinal anaesthesia." European Journal of Anaesthesiology 14, no. 1 (January 1997): 88–89. http://dx.doi.org/10.1097/00003643-199701000-00054.

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Simpson, William A. "Temporal summation of visual motion." Vision Research 34, no. 19 (October 1994): 2547–59. http://dx.doi.org/10.1016/0042-6989(94)90241-0.

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Sharpe, L. T., C. Fach, and K. Nordby. "Temporal summation in the achromat." Vision Research 28, no. 11 (January 1988): 1263–69. http://dx.doi.org/10.1016/0042-6989(88)90042-9.

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Jørum, E., E. Holm, L. Lundberg, and H. E. Torebjbrk. "Temporal summation in nociceptive systems." Pain 41 (January 1990): S314. http://dx.doi.org/10.1016/0304-3959(90)92743-a.

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Dissertations / Theses on the topic "Temporal summation"

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Mulholland, Padraig Joseph. "Temporal summation with age and in glaucoma." Thesis, Ulster University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.650307.

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Standard automated perimetry (SAP) serves as the cornerstone in the diagnosis and monitoring of functional deficits associated with glaucoma. Achromatic contrast thresholds are typically measured at pre-defined locations in the visual field for circular stimuli of constant area and duration. However, the selection of SAP stimulus parameters was made with little or no regard to the ability of the visual system to sum light energy over both space and time, and how such aspects of visual function might vary across the visual field and in glaucoma. In recent years there has been renewed interest in the spatial summation of perimetric stimuli, it being suggested that the sensitivity of SAP, and thus the relationship of contrast thresholds to underlying retinal ganglion cell density, might be improved through a simple scaling of stimulus area. In this thesis we re-examined temporal summation to provide an evidence base from which the selection of appropriate stimulus parameters for SAP might be made. Specifically, we investigated the various factors that can influence the upper limit of complete temporal summation (critical duration) including stimulus area, rate of high-frequency flicker, age and glaucoma. We observed that the critical duration is intrinsically linked to the degree of spatial summation exhibited at any point in the visual field, with the result that temporal summation varies across the visual field when examined using a stimulus scaled to the localised area of complete spatial summation (Ricco's area). We also found the critical duration to be significantly increased in glaucoma when examined using both a standard Goldmann III stimulus and a stimulus scaled to the localised Ricco's area under the conditions of SAP. Based on the results of this thesis we propose the use of stimuli modulating in area, duration and luminance to improve the sensitivity and specificity of perimetry in the detection of glaucoma.
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Persanyi, Mary Wylie. "Individual differences in spatial frequency-dependent visible persistence: The role of temporal summation." Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1057952547.

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Subramanian, Vidhya. "The Spatial And Temporal Characteristics Of Blur Adaptation." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1230923311.

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Feng, Jian Qiang /. Sam, and S3069785@student rmit edu au. "The Effect of Acupuncture on Temporal Summation of Pain: A Randomised, Double-Blind, Sham-Controlled Study." RMIT University. Health Sciences, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080723.115945.

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There was few human study evaluated the analgesic effect of acupuncture on central nervous system (CNS). The electrical temporal summation (TS) pain model has been validated and provides the opportunity to study the central inhibition effect of acupuncture in healthy humans. The present study aimed to: 1. systematically review available randomised, controlled trials (RCTs) of acupuncture on experimentally induced pain in healthy humans; 2. conduct a RCT to assess the effect of manual acupuncture (MA) and electro-acupuncture (EA) on TS of pain and the spatial (i.e. the local and remote sites to acupuncture stimulation) and the temporal (i.e. immediately after and 24-hours after the intervention) characteristics of this effect. The systematic review was carried out in accordance with the requirements of a Cochrane Systematic Review. The methodological quality and credibility of the acupuncture intervention of the included RCTs were assessed. The Review Management software (RevMan version 4.2, The Cochrane Library) was used for data extraction and data analysis. 605 papers were identified from four databases (Pubmed, Cochrane Library, CINAHL and EMBASE). Only nine papers met the inclusion criteria. The methodological quality and credibility of the acupuncture invention were satisfactory. The pain models and interventions applied varied substantially from study to study. Consequently, meta-analyses were not conducted. Comparing acupuncture with non-invasive control, significant acupuncture analgesia was reported. These studies also demonstrated that invasive controls produced analgesia. For the RCT of acupuncture on TS, 27 healthy volunteers were recruited and randomly assigned to either EA, MA or sham-acupuncture (SA) group, with nine volunteers in each group. To test pain thresholds, transcutaneous electrical stimulation was delivered to two sites on the anterior aspects of both legs and one site on the dorsum of the non-dominant forearm. Pain thresholds to single electrical stimulation (SPT) and to TS stimulation (TST) were assessed before, 30-minutes after and 24-hours after the intervention. Acupuncture was given to Zusanli (ST36) and Fenglong (ST 40) on the dominant leg. The level of anxiety was assessed before and after acupuncture with Spielberg State and Anxiety Inventory. The three groups were comparable at baseline. The level of anxiety did not change significantly after acupuncture. EA significantly increased SPT and TST on the treatment leg 24-hour after the treatment when compared with SA (p less than 0.05), but did not increase those measured on the non-treatment leg or the forearm. The fact that such an effect increased within 24 hours after acupuncture might indicate the potential role of neurohumoral mechanisms in acupuncture analgesia. The analgesia effect of EA on TS tended to be localised at the needling site. This observation is different from the understanding of the wide-spread effect of acupuncture. The discrepancy could be due to the small sample size of the current study. In conclusion, this is the first study that demonstrates EA elicits a strong inhibition on the CNS in health humans. Such a central effect lasts more than 24 hours, and limits to the site where acupuncture is applied. These findings need to be confirmed in other TS models.
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Pereira, Manuel Pedro Fernandes Lobo. "Influence of diffuse noxious inhibitory control, temporal summation and expectation on pain perception in healthy volunteers." Dissertação, Instituto de Ciências Biomédicas Abel Salazar, 2010. http://hdl.handle.net/10216/62202.

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Pereira, Manuel Pedro Fernandes Lobo. "Influence of diffuse noxious inhibitory control, temporal summation and expectation on pain perception in healthy volunteers." Master's thesis, Instituto de Ciências Biomédicas Abel Salazar, 2010. http://hdl.handle.net/10216/62202.

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Darchuk, Kathleen M. "Psychophysiological and Psychological Correlates of Pericranial Allodynia and Affective Distress in Young Adult Females." Ohio University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1185823589.

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Petersson, Marcus. "Beyond AMPA and NMDA: Slow synaptic mGlu/TRPC currents : Implications for dendritic integration." Licentiate thesis, KTH, Computational Biology, CB, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24833.

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In order to understand how the brain functions, under normal as well as pathological conditions, it is important to study the mechanisms underlying information integration. Depending on the nature of an input arriving at a synapse, different strategies may be used by the neuron to integrate and respond to the input. Naturally, if a short train of high-frequency synaptic input arrives, it may be beneficial for the neuron to be equipped with a fast mechanism that is highly sensitive to inputs on a short time scale. If, on the contrary, inputs arriving with low frequency are to be processed, it may be necessary for the neuron to possess slow mechanisms of integration. For example, in certain working memory tasks (e. g. delay-match-to-sample), sensory inputs may arrive separated by silent intervals in the range of seconds, and the subject should respond if the current input is identical to the preceeding input. It has been suggested that single neurons, due to intrinsic mechanisms outlasting the duration of input, may be able to perform such calculations. In this work, I have studied a mechanism thought to be particularly important in supporting the integration of low-frequency synaptic inputs. It is mediated by a cascade of events that starts with activation of group I metabotropic glutamate receptors (mGlu1/5), and ends with a membrane depolarization caused by a current that is mediated by canonical transient receptor potential (TRPC) ion channels. This current, denoted ITRPC, is the focus of this thesis.

A specific objective of this thesis is to study the role of ITRPC in the integration of synaptic inputs arriving at a low frequency, < 10 Hz. Our hypothesis is that, in contrast to the well-studied, rapidly decaying AMPA and NMDA currents, ITRPC is well-suited for supporting temporal summation of such synaptic input. The reason for choosing this range of frequencies is that neurons often communicate with signals (spikes) around 8 Hz, as shown by single-unit recordings in behaving animals. This is true for several regions of the brain, including the entorhinal cortex (EC) which is known to play a key role in producing working memory function and enabling long-term memory formation in the hippocampus.

Although there is strong evidence suggesting that ITRPC is important for neuronal communication, I have not encountered a systematic study of how this current contributes to synaptic integration. Since it is difficult to directly measure the electrical activity in dendritic branches using experimental techniques, I use computational modeling for this purpose. I implemented the components necessary for studying ITRPC, including a detailed model of extrasynaptic glutamate concentration, mGlu1/5 dynamics and the TRPC channel itself. I tuned the model to replicate electrophysiological in vitro data from pyramidal neurons of the rodent EC, provided by our experimental collaborator. Since we were interested in the role of ITRPC in temporal summation, a specific aim was to study how its decay time constant (τdecay) is affected by synaptic stimulus parameters.

The hypothesis described above is supported by our simulation results, as we show that synaptic inputs arriving at frequencies as low as 3 - 4 Hz can be effectively summed. We also show that τdecay increases with increasing stimulus duration and frequency, and that it is linearly dependent on the maximal glutamate concentration. Under some circumstances it was problematic to directly measure τdecay, and we then used a pair-pulse paradigm to get an indirect estimate of τdecay.

I am not aware of any computational model work taking into account the synaptically evoked ITRPC current, prior to the current study, and believe that it is the first of its kind. We suggest that ITRPC is important for slow synaptic integration, not only in the EC, but in several cortical and subcortical regions that contain mGlu1/5 and TRPC subunits, such as the prefrontal cortex. I will argue that this is further supported by studies using pharmacological blockers as well as studies on genetically modified animals.


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Peytard, Juliette Maria Bérénice [Verfasser]. "Verstärkung elektrisch ausgelöster Reizantworten des M. tibialis anterior durch temporale Summation nach ipsilateraler Stimulation des N. suralis beim Menschen / Juliette Maria Bérénice Peytard." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2011. http://d-nb.info/1025230809/34.

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You, Dokyoung Sophia. "The Impact of Adverse Childhood Events on Temporal Summation of Second Pain." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11796.

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Adverse childhood events have been identified as a risk factor for developing chronic pain conditions in adulthood. However, previous studies have inconsistently supported the link between adverse childhood events and hypersensitivity to laboratory-induced pain. Therefore, this study intended to investigate the effects of adverse childhood events on temporal summation of second pain (TSSP). A group of 38 healthy and pain-free college students participated in laboratory pain tests after being screened for childhood trauma history. Half of participants (47.5% female) were positive for childhood trauma and the other half (63.2% female) reported no adverse childhood event. The laboratory pain tests measured TSSP using 10 thermal pulses per trial over four consecutive trials. The trauma group showed a tendency of greater sensitization within TSSP trials and lack of habituation over repeated TSSP trials. In sum, adverse childhood events predisposed adults to enhanced TSSP, which is potentially linked to an increased likelihood to develop chronic pain problems.
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Books on the topic "Temporal summation"

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Blumenthal, Terry D. Developmental differences in the temporal summation of transient and sustained auditory stimuli. 1985.

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Zoran, Bujas, ed. Repetitive electric stimulation of the tongue and temporal summation in taste =: Isprekidano električno podraživanje jezika i vremensko zbrajanje u području okusa. Zagreb: Jugoslavenska akademija znanosti i umjetnosti, 1987.

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Mason, Peggy. Electrical Communication Within a Neuron. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190237493.003.0010.

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Postsynaptic potentials integrate across time and space within a single neuron. The influence of the length constant on spatial summation and of the time constant on temporal summation is described. Whereas passive properties give rise to graded potentials, the voltage-gated sodium channel (VGSC) supports the all-or-none action potential. The action potential can be used to conduct information across long distances and is therefore used in the majority of neurons that have axons. How the inactivated state of VGSCs gives rise to the refractory period and dynamic polarization is described. The meaning of the action potential threshold is fully considered and then applied to understand the clinical condition of hyperkalemic periodic paralysis. Trains of action potentials carry information, and degradation of the spike train compromises the message. The speed of action potential conduction along both unmyelinated and myelinated axons is explored. In closing, an overview of demyelinating diseases is offered.
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Book chapters on the topic "Temporal summation"

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Hawken, Michael J., Robert M. Shapley, Michael P. Sceniak, Dario L. Ringach, and Elizabeth N. Johnson. "Contrast Gain, Area Summation and Temporal Tuning in Primate Visual Cortex." In Vision and Attention, 41–62. New York, NY: Springer New York, 2001. http://dx.doi.org/10.1007/978-0-387-21591-4_3.

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Taylor, B. A., M. E. Fennelly, A. Taylor, and J. Farrell. "Temporal summation and motor evoked potential spinal cord monitoring in man." In Handbook of Spinal Cord Monitoring, 368–75. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1416-5_53.

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Kharlamov, Alexander A., and Vladimir V. Raevsky. "Networks constructed of neuroid elements capable of temporal summation of signals." In Neural Information Processing: Research and Development, 56–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39935-3_4.

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Tam, David C., and Michelle A. Fitzurka. "Inter-Arrival Time Spike Train Analyses for Detecting Spatial and Temporal Summation in Neurons." In Computational Neuroscience, 189–95. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4757-9800-5_31.

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"Temporal Summation (Windup)." In Encyclopedia of Pain, 3853. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_202247.

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"Abnormal Temporal Summation." In Encyclopedia of Pain, 3. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_200009.

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VERHEY, JESKO L., and BIRGER KOLLMEIER. "TEMPORAL ASPECTS OF LOUDNESS SUMMATION." In Psychophysics, Physiology and Models of Hearing, 97–100. WORLD SCIENTIFIC, 1999. http://dx.doi.org/10.1142/9789812818140_0020.

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Cohn, T. E. "Spatial and temporal summation in human vision." In Vision, 376–85. Cambridge University Press, 1991. http://dx.doi.org/10.1017/cbo9780511626197.035.

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Murzac, Adrian, Angel Vassilev, and Margarita B. Zlatkova. "Temporal Summation of S-Cone Signals: Dependence of the Critical Duration on the Signal Polarity." In Proceedings of EuroCogSci 03, 422. Routledge, 2019. http://dx.doi.org/10.4324/9781315782362-125.

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Çetingül, H. Ertan, Engin Erzin, Yücel Yemez, and A. Murat Tekalp. "Multimodal Speaker Identification Using Discriminative Lip Motion Features." In Visual Speech Recognition, 463–94. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-186-5.ch016.

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This chapter presents a multimodal speaker identification system that integrates audio, lip texture, and lip motion modalities, and the authors propose to use the “explicit” lip motion information that best represent the modality for the given problem. The work is presented in two stages: First, they consider several lip motion feature candidates such as dense motion features on the lip region, motion features on the outer lip contour, and lip shape features. Meanwhile, the authors introduce their main contribution, which is a novel two-stage, spatial-temporal discrimination analysis framework designed to obtain the best lip motion features. For speaker identification, the best lip motion features result in the highest discrimination among speakers. Next, they investigate the benefits of the inclusion of the best lip motion features for multimodal recognition. Audio, lip texture, and lip motion modalities are fused by the reliability weighted summation (RWS) decision rule, and hidden Markov model (HMM)-based modeling is performed for both unimodal and multimodal recognition. Experimental results indicate that discriminative grid-based lip motion features are proved to be more valuable and provide additional performance gains in speaker identification.
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Conference papers on the topic "Temporal summation"

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Marin, T., M. N. Wernick, Yongyi Yang, and J. G. Brankov. "Motion-compensated temporal summation of cardiac gated SPECT images using a deformable mesh model." In 2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2009. http://dx.doi.org/10.1109/iembs.2009.5333693.

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Zahi, Gabriel, and Shigang Yue. "Reducing motion blurring associated with temporal summation in low light scenes for image quality enhancement." In 2014 International Conference on Multisensor Fusion and Information Integration for Intelligent Systems (MFI). IEEE, 2014. http://dx.doi.org/10.1109/mfi.2014.6997725.

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Pettersen, Pernille Steen, Tuhina Neogi, Karin Magnusson, Hilde Berner Hammer, Tore K. Kvien, Till Uhlig, and Ida Kristin Haugen. "THU0454 CONDITIONED PAIN MODULATION AND TEMPORAL SUMMATION IN PERSONS WITH HAND OSTEOARTHRITIS AND ASSOCIATIONS WITH PAIN SEVERITY." In Annual European Congress of Rheumatology, EULAR 2019, Madrid, 12–15 June 2019. BMJ Publishing Group Ltd and European League Against Rheumatism, 2019. http://dx.doi.org/10.1136/annrheumdis-2019-eular.4186.

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Chen, Hongyu, Jingyu Wang, and Dongyuan Shi. "Spatial-Temporal Correlation-Concerned Measurement Manipulation Detection Based on Gramian Angular Summation Field and Convolutional Neural Networks." In 2021 IEEE 4th International Electrical and Energy Conference (CIEEC). IEEE, 2021. http://dx.doi.org/10.1109/cieec50170.2021.9510750.

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Subbarayalu, Sethuramalingam, and Lonny L. Thompson. "HP-Adaptive Time-Discontinuous Galerkin Finite Element Methods for Time-Dependent Waves." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60403.

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hp-Adaptive time-discontinuous Galerkin methods are developed for second-order hyperbolic systems. Explicit a priori error estimates in terms of time-step size, approximation order, and solution regularity are derived. Knowledge of these a priori convergence rates in combination with a posteriori error estimates computed from the jump in time-discontinuous solutions are used to automatically select time-step size h and approximation order p to achieve a specified error tolerance with a minimal number of total degrees-of-freedom. We show that the temporal jump error is a good indicator of the local error, and the summation of jump error for the total interval is good indicator for the global and accumulation errors. In addition, the accumulation error at the end of a time-step can be estimated well by the summation of the local jump error at the beginning of a time-step provided the approximation order is greater or equal to the solution regularity. Superconvergence of the end points of a time-step for high-order polynomials are also demonstrated.
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Phan, Hien M., and Li He. "Efficient Steady and Unsteady Flow Modeling for Arbitrarily Mis-Staggered Bladerow Under Influence of Inlet Distortion." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-16204.

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Abstract Accurate and efficient predictions of the steady and unsteady flow responses due to the blade-to-blade variation as well as due to the non-axisymmetric inlet distortion have been continually pursued. Computation of two problems concurrently has been rarely done in the past partly because of the need to perform whole annulus bladerow simulations, despite the advances in the current state-of-the-art methods with the phaseshift single passage simulations. The current work attempts to deal with this challenge by developing a new computational approach based on the principle of the multiscale method in the framework of a commercial solver (CFX). The methodology formulation relies on summation of the constituent source terms, each of which corresponds to a particular flow perturbation. The source term element corresponding to the blade-to-blade variation effect is linearly superimposed as in the classical Influence Coefficient Method. Only the relative positions between the reference blade and its neighbor matter in this method, thus enables an arbitrarily mis-staggered bladerow to be computed efficiently. In addition, the source term arisen due to the inlet distortion is calculated based on spatial Fourier transform. A key enabler is that the source term can be pre-computed using a small set of identical blade passages. The source term is then propagated to different spatial and temporal locations depending on the combination of the mis-staggering pattern and the inlet distortion. The multiscale treatment makes it possible to predict a high-resolution flow field effects on the base coarse mesh as if the fine mesh is solved, while achieving a computational gain. The source term summation method proposed in the current work has been validated using a uniformly staggered bladerow, and an arbitrarily mis-staggered bladerow in a clean inflow condition as well as that subject to an inlet distortion.
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Borboni, Alberto, Matteo Lancini, and Rodolfo Faglia. "Residual Vibration Reduction With Commanded Motion Optimization." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20071.

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Residual vibrations affect machines at the end of commanded motion and represent an amplification factor for the work cycle. Furthermore, in repetitive cyclic movements, residual vibrations can lead to an important degeneration of the executed motion, due to a summation effect of undesired dynamic phenomena. For these reasons, the problem of residual vibrations is widely studied in literature and it is faced with different techniques. A first type of approach consists in the production of a structural device realized with proper mechanical solutions devoted to avoid the sources of vibrations. The second approach consists in introducing passive/active physical elements able to attenuate vibrations, by passively consuming their mechanical power or by actively counteracting them with external mechanical power. A third approach is the smart definition of the motion profile of each machine movable part to minimize the vibrational effects. The proposed work is addressed in this direction, with an optimization approach based on the Fourier transformation of the motion profile. More precisely, the natural frequencies of the system are evaluated through experimental tests, the designed motion profile is transformed with a Fourier analysis, a band around the natural frequencies of the system is suppressed from the motion profile spectrum, an antitransformation is implemented to obtain a temporal function, and, finally, a proper optimization is implemented to respect desired kinematical constraints. Experimental results confirmed a significant improvement, in terms of residual vibrations, with respect to the state of the art of motion profiles specifically designed for residual vibrations reduction.
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Liu, Yongzan, Ge Jin, Kan Wu, and George Moridis. "Quantitative Hydraulic-Fracture Geometry Characterization with LF-DAS Strain Data: Numerical Analysis and Field Applications." In SPE Hydraulic Fracturing Technology Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204158-ms.

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Abstract Low-frequency distributed acoustic sensing (LF-DAS) has been used for hydraulic fracture monitoring and characterization. Large amounts of DAS data have been acquired across different formations. The low-frequency components of DAS data are highly sensitive to mechanical strain changes. Forward geomechanical modeling has been the focus of current research efforts to better understand the LF-DAS signals. Moreover, LF-DAS provides the opportunity to quantify fracture geometry. Recently, Liu et al. (2020a;2020b) proposed an inversion algorithm to estimate hydraulic fracture width using LF-DAS data measured during multifracture propagation. The LF-DAS strain data is linked to the fracture widths through a forward model developed based on the Displacement Discontinuity Method (DDM). In this study, we firstly investigated the impacts of fracture height on the inversion results through a numerical case with a four-cluster completion design. Then we discussed how to estimate the fracture height based on the inversion results. Finally, we applied the inversion algorithm to two field examples. The inverted widths are not sensitive to the fracture height. In the synthetic case, the maximum relative error is less than 10% even when the fracture height is two times of the true value. After obtaining the fracture width, the fracture height can be estimated by matching the true strain data under various heights with a strong smooth weight. The error between the calculated strain and true strain decreases as the height is getting close to the true value. In the two field examples, the temporal evolutions of both width summation of all fractures and the width of each fracture show consistent behaviors with the field LF-DAS measurements. The calculated strain data from the forward model matches well with the field LF-DAS strain data. The results demonstrate the robustness and accuracy of the proposed inversion algorithm.
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Huckvale, Mark. "Neural Network Architecture That Combines Temporal and Summative Features for Infant Cry Classification in the Interspeech 2018 Computational Paralinguistics Challenge." In Interspeech 2018. ISCA: ISCA, 2018. http://dx.doi.org/10.21437/interspeech.2018-1959.

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