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Littérature scientifique sur le sujet « Motor bias »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Motor bias"

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Coote, Katherine, et David Livesey. « Optimism bias in children’s motor performance expectations ». Australian Educational and Developmental Psychologist 16, no 2 (novembre 1999) : 52–61. http://dx.doi.org/10.1017/s0816512200027267.

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AbstractDrawing on Plumert’s (1995) findings that children exhibit an optimism bios in their gross motor performance expectations compored with adults, this study tested the hypothesis that younger children are more likely to overestimate their gross motor performance compared with older children. Participants were 6-year-old and 11-year-old children. The accuracy of children’s estimates of their motor performance was assessed using four tasks (horizontal reach, vertical reach, clearance, and stepping), which were adjusted to either well-within, just-within, just-beyond, or well-beyond each child’s individual abilities. Results confirmed that the 6-year-olds significantly overestimated their motor performance compared with 11-year-olds. The discussion focuses upon the ecological validity of these findings, as well as the implications for children’s motor confidence and motor development.
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Chakravarty, Arijit, Louisa Howard et Duane A. Compton. « A Mechanistic Model for the Organization of Microtubule Asters by Motor and Non-Motor Proteins in a Mammalian Mitotic Extract ». Molecular Biology of the Cell 15, no 5 (mai 2004) : 2116–32. http://dx.doi.org/10.1091/mbc.e03-08-0579.

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We used computer simulation to understand the functional relationships between motor (dynein, HSET, and Eg5) and non-motor (NuMA) proteins involved in microtubule aster organization. The simulation accurately predicted microtubule organization under all combinations of motor and non-motor proteins, provided that microtubule cross-links at minus-ends were dynamic, and dynein and HSET were restricted to cross-linking microtubules in parallel orientation only. A mechanistic model was derived from these data in which a combination of two aggregate properties, Net Minus-end–directed Force and microtubule Cross-linking Orientation Bias, determine microtubule organization. This model uses motor and non-motor proteins, accounts for motor antagonism, and predicts that alterations in microtubule Cross-linking Orientation Bias should compensate for imbalances in motor force during microtubule aster formation. We tested this prediction in the mammalian mitotic extract and, consistent with the model, found that increasing the contribution of microtubule cross-linking by NuMA compensated for the loss of Eg5 motor activity. Thus, this model proposes a precise mechanism of action of each noncentrosomal protein during microtubule aster organization and suggests that microtubule organization in spindles involves both motile forces from motors and static forces from non-motor cross-linking proteins.
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Hilt, Pauline M., et Pasquale Cardellicchio. « Attentional bias on motor control : is motor inhibition influenced by attentional reorienting ? » Psychological Research 84, no 2 (8 mars 2018) : 276–84. http://dx.doi.org/10.1007/s00426-018-0998-3.

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Engelbrecht, Sascha E., Neil E. Berthier et Laura P. O'Sullivan. « The Undershoot Bias ». Psychological Science 14, no 3 (mai 2003) : 257–61. http://dx.doi.org/10.1111/1467-9280.03431.

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Learning in stochastic environments is increasingly viewed as an important psychological ability. To extend these results from a perceptual to a motor domain, we tested whether participants could learn to solve a stochastic minimal-time task using exploratory learning. The task involved moving a cursor on a computer screen to a target. We systematically varied the degree of random error in movement in three different conditions; each condition had a distinct time-optimal solution. We found that participants approximated the optimal solutions with practice. The results show that adults are sensitive to the stochastic structure of a task and naturally adjust the magnitude of an undershoot bias to the particular movement error of a task.
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Frenken, Marius, Wanja Hemmerich, David Izydorczyk, Sophie Scharf et Roland Imhoff. « Cognitive processes behind the shooter bias : Dissecting response bias, motor preparation and information accumulation ». Journal of Experimental Social Psychology 98 (janvier 2022) : 104230. http://dx.doi.org/10.1016/j.jesp.2021.104230.

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Ting, Chih-Chung, Stefano Palminteri, Jan B. Engelmann et Maël Lebreton. « Robust valence-induced biases on motor response and confidence in human reinforcement learning ». Cognitive, Affective, & ; Behavioral Neuroscience 20, no 6 (1 septembre 2020) : 1184–99. http://dx.doi.org/10.3758/s13415-020-00826-0.

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AbstractIn simple instrumental-learning tasks, humans learn to seek gains and to avoid losses equally well. Yet, two effects of valence are observed. First, decisions in loss-contexts are slower. Second, loss contexts decrease individuals’ confidence in their choices. Whether these two effects are two manifestations of a single mechanism or whether they can be partially dissociated is unknown. Across six experiments, we attempted to disrupt the valence-induced motor bias effects by manipulating the mapping between decisions and actions and imposing constraints on response times (RTs). Our goal was to assess the presence of the valence-induced confidence bias in the absence of the RT bias. We observed both motor and confidence biases despite our disruption attempts, establishing that the effects of valence on motor and metacognitive responses are very robust and replicable. Nonetheless, within- and between-individual inferences reveal that the confidence bias resists the disruption of the RT bias. Therefore, although concomitant in most cases, valence-induced motor and confidence biases seem to be partly dissociable. These results highlight new important mechanistic constraints that should be incorporated in learning models to jointly explain choice, reaction times and confidence.
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Kobayashi, Yugo, Takashi Yokozeki, Takuma Matsuda, Satoshi Mitomo, Koichi Murata, Michihiro Hachisuka, Yasuyoshi Kaneko et al. « Gamma-Ray Irradiation Response of the Motor-Driver Circuit with SiC MOSFETs ». Materials Science Forum 858 (mai 2016) : 868–71. http://dx.doi.org/10.4028/www.scientific.net/msf.858.868.

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Gamma-ray irradiation effects of motor-driver circuit composed of SiC MOSFETs under motor driving with different PWM frequencies were investigated. The driving current and voltage waveforms were normal when the irradiation exceeded 1.1 MGy at PWM frequency of 10 kHz. In addition, the motor was still rotating in this total dose. We compared the irradiation responses of SiC MOSFETs between the cases of driving states and no bias. The drain current – gate voltage characteristics with no bias shifted to the negative voltage side wider than the driving states. Also the leakage current in the case of driving state is fewer than that of no bias.
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Phillips, Craig A., et D. Stephen Malyevac. « Exoatmospheric Interceptor Pulse Motor Optimization with Discrete Bias Removal ». Journal of Guidance, Control, and Dynamics 23, no 2 (mars 2000) : 376–78. http://dx.doi.org/10.2514/2.4537.

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Colent, C., L. Pisella, C. Bernieri, G. Rode et Y. Rossetti. « Cognitive bias induced by visuo-motor adaptation to prisms ». NeuroReport 11, no 9 (juin 2000) : 1899–902. http://dx.doi.org/10.1097/00001756-200006260-00019.

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Binsted, G., C. Ehresman, M. Heath et D. Saucier. « Execution generated illusory motor bias : two systems, one representation ». Journal of Vision 7, no 9 (18 mars 2010) : 156. http://dx.doi.org/10.1167/7.9.156.

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Thèses sur le sujet "Motor bias"

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Shaw, Pamela. « Estimation methods for Cox regression with nonclassical covariate measurement error / ». Thesis, Connect to this title online ; UW restricted, 2006. http://hdl.handle.net/1773/9544.

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FORTIS, PAOLA. « Prism adaptation : a rehabilitation technique for spatial neglect ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28396.

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This doctoral thesis is divided in six chapters and presents the results of four experiments. It investigates the use of prism adaptation (PA) in the rehabilitation of spatial neglect, how PA may affect spatial cognition, and the specific mechanisms that are influenced by PA. Knowing more about the systems responsive to PA may help our understanding of which symptoms, and which patients, improve optimally after PA training. The Introduction explains concepts and backgrounds useful for the understanding of the experimental projects. First, the definition and characteristics of Unilateral Spatial Neglect are introduced, followed by a review of the distinction in the variety of spatial neglect that separates “perceptual” versus “premotor” neglect and the anatomical and functional dissociation between brain areas associated with these two subtypes of neglect. The Introduction summarizes paradigms that have been used to disentangle the perceptual and premotor components of spatial neglect and the patterns of perceptual and premotor biases reported in neglect patients. A description of different methods that have previously been used in the rehabilitation of spatial neglect is also provided. Among them, the PA technique is described in detail, including the background in which PA has been used, measures to assess the presence of adaptation and aftereffects following the adaptation procedure, processes that have been proposed to be involved in the sensori-motor transformation that occurs during PA, the beneficial effects reported after PA paradigms in neglect patients, and the effects of PA in healthy individuals. Finally, the Introduction gives an overview of the cerebral circuits that appear to be involved in PA based on data derived from brain imaging studies, studies with brain-damaged patients, and studies with primates. The next four chapters report the results of four experiments. These chapters are divided in two main parts. The first section focuses on the feasibility of using ecological visuo-motor activities, based on diverse and engaging visuo-motor tasks, during adaptation to prism. In Experiment 1, 10 neglect patients were submitted to both a standard pointing adaptation training (Frassinetti et al., 2002) and a training involving diverse ecological visuo-motor tasks (Ecological procedure). The effect of the two treatments was compared in a large assessment including a variety of neuropsychological tests as well as functional scales. In Experiment 2, the presence of adaptation and aftereffects was assessed during the ecological procedure, and these measures were compared with those obtained during the traditional pointing task. In Experiment 3, we used a modified version of the paradigm of Schwartz et al. (1997) and Na et al., (1998) to decouple perceptual-attention “where” and motor-intention “aiming” components in visuo-motor tasks (line bisection). The effects of PA on where and aiming components were tested in a large group of neurologically healthy individuals. In Experiment 4, the same effects were tested in a group of five neglect patients. Lastly, the General Discussion summarizes and integrates the results of the four experiments, highlighting the implications for the rehabilitation of spatial neglect. Results from these experiments show that PA training associated with varied visuomotor activities is an effective tool to ameliorate some aspects of spatial neglect as well as functional disabilities, being as effective as the more established pointing task. In the four experiments, measures of adaptation and aftereffects were obtained using three different adaptation procedures: pointing, ecological, and line bisection tasks. It is argued that these measures, especially the aftereffect measures, may be important for establishing the effectiveness of adaptation procedures in neglect rehabilitation. It appears that the three adaptation procedures (pointing, ecological, line bisection) can all induce error correction during the exposure phase. However, the ecological and the pointing procedure seem to create strong and prolonged aftereffects, with the ecological task even better in inducing aftereffects than the pointing task. By contrast, the line bisection task appears to induce weaker aftereffects, suggesting that its use may not be optimal in prism paradigms. Reasons for such differences are explored, focusing on the motivations for the increased aftereffects during the ecological procedure. Indeed, exposure to prism decreased the aiming bias after PA in both studies. In the group of healthy individuals, the initial left aiming bias was reduced after exposure to left-shifting prisms (Experiment 3). In a similar way, in the group of neglect patients the initial right aiming bias improved after exposure to right-shifting prisms (Experiment 4). In addition, in the healthy participants no changes in the aiming bias were found after exposure to right-shifting prisms and control goggles, indicating that the effect of left-shifting prisms was not due to increased familiarity with the task (Experiment 3). These results are interpreted and integrated in light of recent findings. Experiments 1 and 4 also showed the cortical areas associated with neglect in our patients and the responsiveness to the PA paradigm. Results confirmed that patients with right-sided brain lesions in the frontal-parietal cortical and subcortical areas are still able to adapt to the lateral shift induced by prism, and further suggested that adaption to prism and improvement in neglect symptoms can occur even in the presence of an occipital lesion. Finally, the Discussion addresses the question of how to differentiate the effect of the experimental manipulation from spontaneous recovery while testing the efficacy of new rehabilitation methods in brain-damaged individuals. Therefore, evidence for the specificity of our intervention is provided. It is argued that spontaneous recovery cannot fully account for the present findings of improvement in neglect symptoms after PA treatment (Experiment 1 and 4). It is also suggested that performing studies employing neurologically healthy subjects can help in providing evidence for the effect of a treatment on cognitive function. In particular, testing healthy subjects to better understand the functioning of PA in neglect patients is facilitated by the fact that healthy individuals show biases in spatial cognition that mirror the biases in neglect patients.
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Casey, Michael Bernard. « An epigenetic theory of hemispheric specialization : the role of prenatal sensori-motor experience in the development of turning bias and spatial orientation in bobwhite quail (Colinus virginianus) ». Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/40212.

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Werner, Claudia. « Vergleichende Untersuchungen zu KWK-Systemen im Leistungssegment bis 30 kW elektrischer Leistung ». Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola&quot, 2009. http://nbn-resolving.de/urn:nbn:de:swb:105-2868023.

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Interessante Optionen in der dezentralen Energieversorgung ergeben sich mit dem Einsatz von erdgasbetriebenen Gas-Otto-Motor-, Mikrogasturbinen-, Stirlingmotor- und PEMFC-Modulen. In dem Zusammenhang ist zu beachten, dass die Nutzungsmöglichkeiten dieser KWK-Systeme auch durch die elektrischen und thermischen Bedarfswerte und -strukturen der zu versorgenden Objekte bestimmt werden. Der Schwerpunkt dieser Arbeit ist, neben einer experimentellen und theoretischen Untersuchung ausgewählter KWK-Module, die vergleichende Bewertung von KWK-Anwendungen in der Hausenergieversorgung. Am Beispiel der Energieversorgung von Modell-Siedlungen nach VDI 2067-7 wird der stationäre Betrieb der untersuchten KWK-Module im bi- und polyvalenten Einsatz nachgebildet und bilanziert. Zur Bewertung der KWK-Konzepte erfolgt ein Vergleich zu einer konventionellen Energieversorgungsstrategie mit getrennter Bereitstellung elektrischer und thermischer Energie. Als Indikatoren zur Beurteilung der dezentralen Energieversorgungsvarianten dienen definierte energetische, ökologische und ökonomische Faktoren. Im Rahmen von Simulationsanalysen wird die Bedeutung der Integrations- und Einsatzweise der KWK-Module untersucht. Ein Variantenvergleich der Energieversorgungsstrategien verdeutlicht, welche Einsatzmöglichkeiten der KWK-Module für die untersuchte Struktur der Hausenergieversorgung beim gegenwärtigen Stand der Technik zweckmäßig sind.
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Köhring, Pierre. « Beitrag zur Berechnung der Stromverdrängung in Niederspannungsasynchronmaschinen mit Kurzschlussläufern mittlerer bis großer Leistung ». Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola&quot, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-26689.

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Die vorliegende Arbeit beschäftigt sich mit modernen geregelten Niederspannungsdrehstromantrieben. Es wird insbesondere auf das Problem der Stromverdrängung bei Maschinen mittlerer bis großer Leistung eingegangen. Für hohe Frequenzen in Verbindung mit hohen Ständernuten kommt es dabei zu einer gravierenden Erhöhung der Ständerwicklungsverluste infolge der Stromverdrängung. Diese führt sowohl zu einem starken Anstieg der mittleren Erwärmung der Maschine als auch zu Heißpunkten in der Ständerwicklung. Aufgrund ihres Einsatzes als Prüfstandsmotor werden moderne geregelt betriebene Induktionsmotoren gezielt zu Drehschwingungen angeregt. Eine ähnliche Problematik findet man in abgwandelter Form auch bei Maschinen der Querschneiderindustrie, welche Spielzeiten im zehntel Sekundenbereich aufweisen. Bei diesen Induktionsmaschinen kommt es aufgrund der zyklischen Drehmomentänderung zu einem Stromverdrängungseffekt in den Stäben des Kurzschlusskäfigs. Es entsteht damit eine zusätzliche Verlustquelle, die wesentlich zur Erwärmung des Läufers beiträgt. Nach dem heutigen Stand der Wissenschaft geht man bei der Stromregelung von einem Trägheitsverhalten 1.Ordnung für die Übertragungsfunktion der Induktionsmaschine aus. Die vorliegende Arbeit erweitert dieses Modell unter Berücksichtigung der Läuferstromverdrängung
This study focuses on modern controlled low voltage three phase machines, especially, on the problem of the skin effect in machines of middle and high power range. Due to the skin effect, a severe increase of the dissipation power of the slot windings can be observed for high frequencies with deep slots. This causes a sharp rise of the temperature of the machine as well as hot spots in the stator winding. As a result of its use as test bench applications, modern controlled induction machines are purposefully stimulated for torsional vibration. A similar difficulty can be found in machines for the cross cutter industry, which can be applied in the tenth part of a second, for instance. Because of the cyclical change of the torque in these induction machines, a skin effect results in the bars of the squirrel-cage. Here, an additional source of dissipation, which adds considerably to the heating of the rotor, emerges. Following the state of today’s science, at the current control loop an PT1-element can be assumed for the transfer function of induction machines. This study expands the model with regard to the rotor skin effect
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Werner, Claudia. « Vergleichende Untersuchungen zu KWK-Systemen im Leistungssegment bis 30 kW elektrischer Leistung ». Doctoral thesis, Freiberg : TU Bergakademie Freiberg, Fakultät Maschinenbau, Verfahrens- und Energietechnik, 2004. https://fridolin.tu-freiberg.de/archiv/html/EnergietechnikWernerClaudia286802.html.

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Köhring, Pierre. « Beitrag zur Berechnung der Stromverdrängung in Niederspannungsasynchronmaschinen mit Kurzschlussläufern mittlerer bis großer Leistung ». Doctoral thesis, TU Bergakademie Freiberg, 2004. https://tubaf.qucosa.de/id/qucosa%3A22700.

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Die vorliegende Arbeit beschäftigt sich mit modernen geregelten Niederspannungsdrehstromantrieben. Es wird insbesondere auf das Problem der Stromverdrängung bei Maschinen mittlerer bis großer Leistung eingegangen. Für hohe Frequenzen in Verbindung mit hohen Ständernuten kommt es dabei zu einer gravierenden Erhöhung der Ständerwicklungsverluste infolge der Stromverdrängung. Diese führt sowohl zu einem starken Anstieg der mittleren Erwärmung der Maschine als auch zu Heißpunkten in der Ständerwicklung. Aufgrund ihres Einsatzes als Prüfstandsmotor werden moderne geregelt betriebene Induktionsmotoren gezielt zu Drehschwingungen angeregt. Eine ähnliche Problematik findet man in abgwandelter Form auch bei Maschinen der Querschneiderindustrie, welche Spielzeiten im zehntel Sekundenbereich aufweisen. Bei diesen Induktionsmaschinen kommt es aufgrund der zyklischen Drehmomentänderung zu einem Stromverdrängungseffekt in den Stäben des Kurzschlusskäfigs. Es entsteht damit eine zusätzliche Verlustquelle, die wesentlich zur Erwärmung des Läufers beiträgt. Nach dem heutigen Stand der Wissenschaft geht man bei der Stromregelung von einem Trägheitsverhalten 1.Ordnung für die Übertragungsfunktion der Induktionsmaschine aus. Die vorliegende Arbeit erweitert dieses Modell unter Berücksichtigung der Läuferstromverdrängung.
This study focuses on modern controlled low voltage three phase machines, especially, on the problem of the skin effect in machines of middle and high power range. Due to the skin effect, a severe increase of the dissipation power of the slot windings can be observed for high frequencies with deep slots. This causes a sharp rise of the temperature of the machine as well as hot spots in the stator winding. As a result of its use as test bench applications, modern controlled induction machines are purposefully stimulated for torsional vibration. A similar difficulty can be found in machines for the cross cutter industry, which can be applied in the tenth part of a second, for instance. Because of the cyclical change of the torque in these induction machines, a skin effect results in the bars of the squirrel-cage. Here, an additional source of dissipation, which adds considerably to the heating of the rotor, emerges. Following the state of today’s science, at the current control loop an PT1-element can be assumed for the transfer function of induction machines. This study expands the model with regard to the rotor skin effect.
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Dogantimur, Erkan, et Daniel Johnsson. « Analysis of Accuracy for Engine and Gearbox Sensors ». Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-388346.

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This thesis provides a standardized method to measure accuracy for engine and gearbox sensors. Accuracy is defined by ISO 5725, which states that trueness and precision need to be known to provide a metric for accuracy. However, obtaining and processing the data required for this is not straight forward. In this thesis, a method is presented that consists of two main parts: data acquisition and data analysis. The data acquisition part shows how to connect all of the equipment used and how to sample and store all the raw data from the sensors. The data analysis part shows how to process that raw data into statistical data, such as trueness, repeatability and reproducibility for the sensors. Once repeatability and reproducibility are known, the total precision can be determined. Accuracy can then be obtained by using information from trueness and precision. Besides, this thesis shows that measurement error can be separated into error caused by the sensors and error caused by the measurand. This is useful information, because it can be used to assess which type of error is the greatest, whether or not it can be compensated for, and if it is economically viable to compensate for such error.  The results are then shown, where it is possible to gain information about the sensors’ performance from various graphs. Between Hall and inductive sensors, there were no superior winner, since they both have their strengths and weaknesses. The thesis ends by making recommendations on how to compensate for some of the errors, and how to improve upon the method to make it more automatic in the future.
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Blagouchine, Iaroslav. « Modélisation et analyse de la parole : Contrôle d’un robot parlant via un modèle interne optimal basé sur les réseaux de neurones artificiels. Outils statistiques en analyse de la parole ». Thesis, Aix-Marseille 2, 2010. http://www.theses.fr/2010AIX26666.

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Cette thèse de doctorat traite les aspects de la modélisation et de l'analyse de la parole, regroupés sous le chapeau commun de la qualité. Le premier aspect est représenté par le développement d'un modèle interne de contrôle de la production de la parole ; le deuxième, par le développement des outils pour son analyse. Un modèle interne optimal sous contraintes est proposé pour le contrôle d'un robot parlant, basé sur l'hypothèse du point d'équilibre (EPH, modèle-lambda). Ce modèle interne se repose sur le principe suivant : les mouvements du robot sont produits de telle façon que la longueur du chemin, parcouru dans l'espace interne des commandes motrices lambda, soit minimale, sous certaines contraintes liées à l'espace externe. L'aspect mathématique du problème conduit au problème géodésique généralisé, un problème relevant du calcul variationnel, dont la solution exacte analytique est assez complexe. En utilisant certains résultats empiriques, une solution approximative est enfin développée et implémentée. La solution du problème donne des résultats intéressants et prometteurs, et montre que le modèle interne proposé permet d'atteindre une certaine réalité de la production de la parole ; notamment, des similitudes entre la parole réelle et celle produite par le robot sont constatées. Puis, dans un but d'analyser et de caractériser le signal de parole, plusieurs méthodes d'analyse statistique sont développées. Elles sont basées sur les statistiques d'ordre supérieurs et sur l'entropie discrète normalisée. Dans ce cadre, nous avons également élaboré un estimateur non-biaisée et efficace du cumulant d'ordre quatre, en deux versions bloc et adaptative
This Ph.D. dissertation deals with speech modeling and processing, which both share the speech quality aspect. An optimum internal model with constraints is proposed and discussed for the control of a biomechanical speech robot based on the equilibrium point hypothesis (EPH, lambda-model). It is supposed that the robot internal space is composed of the motor commands lambda of the equilibrium point hypothesis. The main idea of the work is that the robot movements, and in particular the robot speech production, are carried out in such a way that, the length of the path, traveled in the internal space, is minimized under acoustical and mechanical constraints. Mathematical aspect of the problem leads to one of the problems of variational calculus, the so-called geodesic problem, whose exact analytical solution is quite complicated. By using some empirical findings, an approximate solution for the proposed optimum internal model is then developed and implemented. It gives interesting and challenging results, and shows that the proposed internal model is quite realistic; namely, some similarities are found between the robot speech and the real one. Next, by aiming to analyze speech signals, several methods of statistical speech signal processing are developed. They are based on higher-order statistics (namely, on normalized central moments and on the fourth-order cumulant), as well as on the discrete normalized entropy. In this framework, we also designed an unbiased and efficient estimator of the fourth-order cumulant in both batch and adaptive versions
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Caldas, Tiago Reis [UNESP]. « Desenvolvimento de um instrumento portátil para detectar falha em rolamento de motor de indução, pela técnica do envelope, usando um DSP de 16 bits e a transformada de Hilbert ». Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/97047.

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Em um ambiente industrial é responsabilidade da manutenção cumprir com as necessidades específicas de cada processo produtivo. Basicamente é necessário aumentar a disponibilidade e a confiabilidade dos equipamentos. Este trabalho apresenta o desenvolvimento de um equipamento portátil para identificar precocemente problemas em rolamentos, utilizando o método conhecido como técnica de envelope ou HFRT (High Frequency Resonance Technique). A técnica de envelope é justificada como sendo a mais indicada para detectar defeitos de único ponto em rolamentos. Os principais componentes dos circuitos são apresentados, justificando a utilização. A programação do microcontrolador dsPIC33 foi feita em C, utilizando o MPLAB IDE da Microchip. Após a aquisição do sinal de aceleração, são aplicados alguns filtros e transformadas, sobretudo a transformada de Fourier com 1024 pontos amostrados em 5ksps, para cálculo do espectro da vibração. Como interface homemmáquina (IHM), foram utilizados um teclado e um mostrador gráfico que apresenta as amplitudes referentes às frequências de falha. Com base nos espectros e nas amplitudes, é possível comparar com os valores das normas vigentes (ISO 2372, ISO 3945 ou ISO 10816), gerando por fim um laudo sobre o estado dos rolamentos do motor elétrico. O protótipo foi testado utilizando os sinais gerados pelo Matlab/Simulink e apresentou um ótimo desempenho
In an industrial environment is the responsibility of maintenance keeping the specific needs of each production process. Basically it is necessary to increase the availability and reliability of equipment. This work presents the development of a portable device to identify problems early on bearings, using the method known as technical envelope or HFRT (High Frequency Resonance Technique). The envelope technique is justified as being more suitable for detecting single point defects in bearing. The main components of the circuits are presented, justifying the use. The dsPIC33 microcontroller programming was done in C using Microchip's MPLAB IDE. After the acquisition of the acceleration signal, some filters are processed and applied , especially the Fourier transformed of 1024 points sampled in 5ksps to calculate the spectrum of vibration. As human interface (HMI), a keyboard and a graphical display were used which shows the amplitudes related to the failure frequency. Based on the spectra and the amplitudes, it is possible to compare the values of standards (ISO 2372, ISO 3945 or ISO 10816), finally originating a report about the state of electric motor bearings. The prototype was tested using the signals originated by Matlab / Simulink and it has presented a great performance
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Livres sur le sujet "Motor bias"

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John, Knowles. Racial bias in motor vehicle searches : Theory and evidence. Cambridge, MA : National Bureau of Economic Research, 1999.

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Sŏn-yŏng, Kwak, Li Guihua et Li Chunming, dir. Qin zi dong dong yao / [zuo zhe : Jiang Chengyan, cha tu : Guo Xianying] ; Han song jiao yu bian ; Li Guihua yi ; Li Chunming gai bian. Nanchang Shi : Jiangxi gao xiao chu ban she, 2011.

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Jules, Kinda, et Burkina Faso. Sous-commission nationale du moore, dir. Moor gom-biis no-tũur gv̳lsg sebre = : Dictionnaire orthographique du mooré. Burkina Faso] : Sous-commission nationale du mooré, 1998.

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Vicente, Migeul De Castro. El Motor Diesel. Ceac, 2005.

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Nobre, Anna C. (Kia), et Gustavo Rohenkohl. Time for the Fourth Dimension in Attention. Sous la direction de Anna C. (Kia) Nobre et Sabine Kastner. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199675111.013.036.

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This chapter takes attention into the fourth dimension by considering research that explores how predictive information in the temporal structure of events can contribute to optimizing perception. The authors review behavioural and neural findings from three lines of investigation in which the temporal regularity and predictability of events are manipulated through rhythms, hazard functions, and cues. The findings highlight the fundamental role temporal expectations play in shaping several aspects of performance, from early perceptual analysis to motor preparation. They also reveal modulation of neural activity by temporal expectations all across the brain. General principles of how temporal expectations are generated and bias information processing are still emerging. The picture so far suggests that there may be multiple sources of temporal expectation, which can bias multiple stages of stimulus analysis depending on the stages of information processing that are critical for task performance. Neural oscillations are likely to provide an important medium through which the anticipated timing of events can regulate neuronal excitability.
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Chapitres de livres sur le sujet "Motor bias"

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Naing, Ye Win, Panarit Sethakul et Myo Thu Win. « Learning Enhancement of Electrical Engineering Students (TU Dawei) by Using the Developed Voltage Source Inverter (VSI) for 3-Phase Induction Motor Drives by Modern 32-bits Microcontroller ». Dans Advances in Intelligent Systems and Computing, 430–42. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-40271-6_43.

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Croskerry, Pat. « Straining the Strain Diagnosis ». Dans The Cognitive Autopsy, sous la direction de Pat Croskerry, 263–70. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780190088743.003.0041.

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In this case, a woman in her late 30s was brought to the emergency department (ED) following a motor vehicle collision. She was a passenger in a car that was T-boned on the passenger side. Her principal complaint was neck pain. After plain radiographs showed no bony injury, she was discharged with cervical strain. She presented again to the same ED on three further occasions before her correct diagnosis was made. Aspects of implicit bias are highlighted in her care.
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Singh, Uday Pratap, Sanjeev Jain, Rajeev Kumar Singh et Mahesh Parmar. « Modified Differential Evolution Algorithm Based Neural Network for Nonlinear Discrete Time System ». Dans Handbook of Research on Recent Developments in Intelligent Communication Application, 397–420. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1785-6.ch016.

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Two main important features of neural networks are weights and bias connection, which is still a challenging problem for researchers. In this paper we select weights and bias connection of neural network (KN) using modified differential evolution algorithm (MDEA) i.e. MDEA-NN for uncertain nonlinear systems with unknown disturbances and compare it with KN using differential evolution algorithm (DEA) i.e. DEA-KN. In this work, MDEA is based on exploitation and exploration of capability, we have implemented differential evolution algorithm and modified differential evolution algorithm, which are based on the consideration of the three main operator's mutation, crossover and selection. MDEA-KN is applied on two different uncertain nonlinear systems, and one benchmark problem known as brushless dc (BDC) motor. Proposed method is validated through statistical testing's methods which demonstrate that the difference between target and output of proposed method are acceptable.
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Singh, Uday Pratap, Sanjeev Jain, Rajeev Kumar Singh et Mahesh Parmar. « Modified Differential Evolution Algorithm Based Neural Network for Nonlinear Discrete Time System ». Dans Deep Learning and Neural Networks, 1598–621. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0414-7.ch089.

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Two main important features of neural networks are weights and bias connection, which is still a challenging problem for researchers. In this paper we select weights and bias connection of neural network (KN) using modified differential evolution algorithm (MDEA) i.e. MDEA-NN for uncertain nonlinear systems with unknown disturbances and compare it with KN using differential evolution algorithm (DEA) i.e. DEA-KN. In this work, MDEA is based on exploitation and exploration of capability, we have implemented differential evolution algorithm and modified differential evolution algorithm, which are based on the consideration of the three main operator's mutation, crossover and selection. MDEA-KN is applied on two different uncertain nonlinear systems, and one benchmark problem known as brushless dc (BDC) motor. Proposed method is validated through statistical testing's methods which demonstrate that the difference between target and output of proposed method are acceptable.
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Sasayama, Teruyoshi, Shoji Hamada et Tetsuo Kobayashi. « Application of Prewhitening Beamformer with Linear Constraints for Correlated EEG Signal Source Estimation ». Dans Advances in Bioinformatics and Biomedical Engineering, 243–54. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2113-8.ch025.

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To investigate the effect of signal correlation, the authors compared the relative abilities to estimate the source of an ERD/ERS signal among minimum variance beamformer (MVBF), linearly constrained (LC)-MVBF, prewhitening beamformer (PWBF), and LC-PWBF during the measurement of correlated signals. In numerical simulations, equivalent current dipoles were placed in the primary motor cortex to detect the modulation of µ and ß rhythms. It was confirmed that the location bias of LC-PWBF was smaller than that of MVBF, LC-MVBF, and PWBF. These results suggest that LC-PWBF is useful for estimating the location of signal sources that are highly correlated and have low signal-to-noise ratio.
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Kardamakis, Andreas A., Juan Pérez-Fernández et Sten Grillner. « Networks in the Lamprey Optic Tectum ». Dans Handbook of Brain Microcircuits, sous la direction de Gordon M. Shepherd et Sten Grillner, 467–74. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190636111.003.0040.

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Critical to survival is the rapid detection and processing of events, registered by our senses, for the selection of an appropriate motor action. One essential task is to select or prioritize which of the many stimuli is most important for gaze reorientation. In vertebrates, parts of this sensorimotor task are solved by a dorsal mesencephalic region called the optic tectum (OT), also known as the superior colliculus (SC) in mammals. This structure receives direct afferent multisensory inputs, but also indirect cognitive and other nonsensory modulatory inputs from forebrain areas used to bias tectal activity. These inputs interact with the intrinsic tectal circuitry to select orientin or evasive behavior. This chapter explores the phylogenetic conservation of the OT and its connectivity pattern in an accessible and reductionist vertebrate animal model, the lamprey, to develop preparations that allow for isolating components of this sensorimotor process while evaluating their impact on goal-directed behavior.
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Berent, Iris. « Nativist Intuitions ». Dans The Blind Storyteller, 89–95. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190061920.003.0006.

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Having shown that innate knowledge is a viable scientific hypothesis with considerable evidence in its support, the next three chapters examine laypeople’s intuitions about innate knowledge. We describe a series of experiments that contrasts people’s intuitions about the origins of cognitive traits (those that capture knowledge) and noncognitive traits (either sensory, motor, or emotive capacities). Results show that people believe that cognitive traits are not innate. People maintain these convictions even when they are provided with detailed descriptions of experiments from infant research (those reviewed in previous chapters), complete with an explanation of the rationale and method; while science clearly suggests these principles are present in newborns, people insist that they aren’t. Other results demonstrate that our antinativist intuitions are a bias, as people maintain these intuitions despite explicit evidence to the contrary, and even when they are presented with innate knowledge of nonhuman species. These results show that people are systematically and selectively biased against innate ideas.
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« B3. Motor learning ». Dans BIOS Instant Notes in Sport and Exercise Psychology, 76–82. Routledge, 2004. http://dx.doi.org/10.4324/9780203325568-17.

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Schulte, Felix. « Das Planarmotorantriebssystem XPlanar ». Dans Getriebetagung 2022, 183–96. Logos Verlag Berlin, 2022. http://dx.doi.org/10.30819/5552.16.

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Das Multi-Mover-Planarmotorantriebssystem XPlanar kombiniert die Eigenschaften herkömmlicher Transport- und Handlingsysteme wie Sechs-Achs-Robotern, Linearmotoren oder Fahrerlosen Transportsystemen (AGV). Produkte werden über die XPlanar-Mover dynamisch und hochpräzise in bis zu sechs Achsen positioniert und können unabhängig voneinander durch den Fertigungsprozess geführt werden. Durch den einzigartigen magnetischen Schwebeeffekt des Systems werden Verschleiß, Geräuschemissionen und Wartungsaufwand minimiert. In Kombination mit der zentralen Steuerung und Programmierung ergeben sich vielfältige neue Ansätze für die Konzeption moderner, hochflexibler Fertigungsmaschinen. The multi mover planar motor system Xplanar combines the attributes of traditional transport and handling systems such as six axis robots, linear motors, or automated guided vehicle (AGVs). XPlanar offers a dynamic and precise positioning of products on movers in up to 6 axis and an individual transport of products through the entire manufacturing process. The unique magnetic levitation effect of the movers minimizes wear and tear, noise emissions, and maintenance time. In combination with central control and programming the XPlanar system enables new approaches to design modern and highly flexible production machines.
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« B2. Indirect and direct theories of motor control ». Dans BIOS Instant Notes in Sport and Exercise Psychology, 68–75. Routledge, 2004. http://dx.doi.org/10.4324/9780203325568-16.

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Actes de conférences sur le sujet "Motor bias"

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Critchley, R. « Inverter/motor inter-compatibility with particular bias to insulation ». Dans IEE Colloquium Effects of High Speed Switching on Motors and Drives. IEE, 1999. http://dx.doi.org/10.1049/ic:19990736.

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Du, Hongliu. « An E/H Control Design for a Hydraulic Variable Displacement Axial Piston Motor ». Dans ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control. ASMEDC, 2011. http://dx.doi.org/10.1115/dscc2011-5968.

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A simple and novel speed control scheme for variable displacement motors has been developed under the consideration of some system uncertainties. Theoretical analysis and experimental test results have shown that the proposed control strategy is capable of driving the swashplate to track its desired trajectory with robust stability and satisfactory performance. An adaptive learning algorithm enables the controls to automatically adjust for uncertainties in the control bias current. Compared with its hydro-mechanical counterpart, the provided E/H control results in a hydraulic variable displacement motor with lower cost and better performance.
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Xue, B., H. Wang et S. Tang. « Stiffness analysis for bearingless switched reluctance motor with bias permanent magnet ». Dans 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7157247.

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Chen, Hsin-Chuan. « An H-bridge driver using gate bias for DC motor control ». Dans 2013 IEEE 17th International Symposium on Consumer Electronics (ISCE). IEEE, 2013. http://dx.doi.org/10.1109/isce.2013.6570219.

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Wang, H., S. Tang et B. Xue. « Rotor resonances of bearingless switched reluctance motor with axial bias permanent magnet ». Dans 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7157244.

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Boiko, Yuri, Iluju Kiringa et Tet Yeap. « Current drainage induced by bias injection attack against Kalman filter of BLDC motor ». Dans 2022 IEEE International Conference on Cyber Security and Resilience (CSR). IEEE, 2022. http://dx.doi.org/10.1109/csr54599.2022.9850310.

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Boiko, Yuri, Iluju Kiringa et Tet Yeap. « Voltage hopping induced by bias injection attack against Kalman filter of BLDC motor ». Dans 2023 IEEE 2nd International Conference on AI in Cybersecurity (ICAIC). IEEE, 2023. http://dx.doi.org/10.1109/icaic57335.2023.10044123.

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Nagai, Ayumi, Kazuhide Mitsuya et Kanji Nakamura. « Transverse-Flux-type Switched Reluctance Motor with Permanent Magnets Applying Reverse Bias Magnetic Field ». Dans 2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia). IEEE, 2022. http://dx.doi.org/10.23919/ipec-himeji2022-ecce53331.2022.9806887.

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Guo Hong et Liu Kaipei. « Model of the permanent magnet linear synchronous motor on the bias of the field orientation ». Dans Proceedings of the Eighth International Conference on Electrical Machines and Systems. IEEE, 2005. http://dx.doi.org/10.1109/icems.2005.202565.

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Roan, Esra, Haden A. Janda, Egleide Y. Elenes et Ruxandra C. Marinescu. « Gender Bias in Pelvic Fractures : A Geometrical and Structural Assessment ». Dans ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-205733.

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Pelvic fractures are complex, devastating fractures in musculoskeletal trauma that account for approximately 3% of all skeletal injuries, and unfortunately, still constitute a major cause of death and disability [1, 2]. Approximately 64% of all pelvic fractures are due to motor vehicle crashes (MVC). Rowe et al. (2004) identified female gender as a significant risk factor for pelvic ring fractures resulting from MVC. Women are three times more likely than males to have a pelvic fracture due to MVC [3, 4, 5]. Body mass index (BMI) and height differences have not been recognized as risk factors and it is presumed that a possible cause of increased fracture susceptibility in women could be the geometric differences between female and male pelvises [3]. Furthermore, according to Army Medical Research, female recruits have a higher incidence of pelvis (pubis) fractures due to overuse injuries than their male counterparts [3–7].
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Rapports d'organisations sur le sujet "Motor bias"

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Knowles, John, Nicola Persico et Petra Todd. Racial Bias in Motor Vehicle Searches : Theory and Evidence. Cambridge, MA : National Bureau of Economic Research, décembre 1999. http://dx.doi.org/10.3386/w7449.

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Karasawa, H., et T. Ohno. Development of PDC Bits for Downhole Motors. Office of Scientific and Technical Information (OSTI), janvier 1995. http://dx.doi.org/10.2172/895944.

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