Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"Motor Systems"”.
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Control of Dynamic Performance in Step Motor Systems
The step motor is an electromagnetic incremental motion control actuator. Step motors of both linear and rotary types have been constructed. When energized by direct currents in a programmed manner the step motor indexes in fixed linear or angular increments. In general, the motor does not follow …
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Multimodal dynamics : self-supervised learning in perceptual and motor systems
… a self-supervised framework for perceptual and motor learning based upon correlations in different sensory modalities. The brain and cognitive sciences have gathered an enormous body of neurological and phenomenological evidence in the past half century demonstrating the extraordinary degree of …
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Descreteness in spinal motor systems in the rat and frog
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 1998.
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Plasticity of Brainstem Motor Systems in Response to Developmental Nicotine Exposure
… of these neurons, is a main determinant of motor output to the muscles of the tongue. Additionally, we tested the hypothesis that DNE alters the function of nAChRs located on multiple brainstem neurons, including those that modulate fast-synaptic transmission to XIIMNs. For these …
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ANALYSIS AND SIMULATION OF STEPPING MOTOR SYSTEMS USING A PHASE PLANE APPROACH
<p>Stepping motors have become an increasingly popular electromechanical interface device, due to their increased reliability and lower costs over the D.C. Servo motor. The inherent open loop mode of stepping motor operation results, under certain circumstances, in a failure mode in which the …
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Energy Storage and Electric Motor Systems Projects for Hands-on Student Learning
… the energy storage system (ESS) and the motor system. Each project is considered low voltage (LV) for safety and simplicity, however high voltage techniques are used for learning purposes. The LV ESS is used to power up an LV motor system. To limit depletion of the battery energy, another …
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The effects of tonic muscle pain on the sympathetic and somatic motor systems in humans
… through a reflex mechanism. Increased gamma-motor drive causes intrafusal fibres to contract increasing muscle spindle afferent firing. This activity in turn will raise the likelihood of activation in the pool of alpha-motorneurones projecting to the primary muscle increasing resting muscle …
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Brain development from sensorimotor experiences: Handwriting and letter perception
Handwriting is a visual-motor activity that is particularly effective at increasing letter recognition, a fundamental skill in early reading development. This dissertation focuses on understanding the neural mechanisms that underlie increases in letter recognition after handwriting practice. The …
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Efficient Control of DC Servomotor Systems Using Backpropagation Neural Networks
DC motor systems have played an important role in the improvement and development of the industrial revolution, making them the heart of different applications beside AC motor systems. Therefore, the development of a more efficient control strategy that can be used for the control of a DC …
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Neural basis of a visuo-motor transformation in the fly
… of populations of sensory neurons are used by motor systems to generate appropriate behaviour is a long standing question in neuroscience. I address this problem by studying a comparatively simple model system. In the fly, Neck Motor Neurons control gaze-stabilising head movements that occur …
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An investigation into morphological and biochemical abnormalities in the central nervous system of the mutant mouse tottering
… triad while overlooking the significant motor behavior abnormalities. This dissertation compared the morphology of developing and adult cerebella and the distribution patterns of calcium binding proteins throughout the motor systems of the brain, in two related murine mutants (tottering …
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Intelligent Textiles for Physical Interactions
… involving the constant use of our sensory and motor systems to extract, process, and communicate information. However, capturing, analyzing, and reproducing these interactions pose significant challenges due to their pervasive, variable, and prolonged nature, as well as their unique character …
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Induction motor torque during fast bus transfers
This project examines transient induction motor machine torque during fast bus transfers. In an effort to limit the damage to motors during a transfer, industry standards specify that the resultant vectorial volts per hertz between the motor and voltage source must not exceed 1.33 per unit. This …
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Voxel-Based Lesion Symptom Mapping as a Predictor of Motor Impairment after Stroke
… analysis was utilized to predict degree of motor impairment based on lesion location. Magnetic Resonance Imaging (MRI) was used to collect T1 weighted structural images of lesions in 11 participants who suffered primarily left hemisphere damage due to stroke. Assessments from the Lower …
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Unsupervised learning of vocal tract sensory-motor synergies
… degrees of freedom problem is ubiquitous within motor control arising out of the redundancy inherent in motor systems and raises the question of how control actions are determined when there exist infinitely many ways to perform a task. Speech production is a complex motor control task and …
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Design study of flapping foil propulsion for an Odyssey Class autonomous underwater vehicle
… The links are driven with DC brushless motor systems through a Scotch yoke linkage and a linear actuator. Pitch and roll motion is accomplished with the addition of servo actuated pectoral fins, while dorsal and anal fins provide additional directional stability. A variety of motion …
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Linearity, motor primitives and low-dimensionality in the spinal organization of motor control
… the central nervous system is able to control motor systems with an impressive level of complexity and effectivity. One such example is the frog. Evidence suggests that in frogs, the central nervous system, and the spinal cord in particular, may adopt simplifying strategies to ease the motor …
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Effects of Neck Muscle Fatigue on the Vestibulo-Ocular Reflex
… and processes input from multiple sensory systems including the visual, vestibular, and somatosensory systems. The information from these systems is sent to the brain where the information is then combined, organized and interpreted. This results in the output of reflexes (vestibulo-ocular …
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Implementation of Design Failure Modes and Effects Analysis for Hybrid Vehicle Systems
… under which educational competitions occur. The motor system case study within this work aims to allow the process for DFMEA to be simple and easily implemented and understood when it is appropriate to start. After defining the model, an electric motor system for hybrid vehicle is analyzed for …
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The things you do: Implicit person models guide online action observation.
… observed actions are matched to higher level (or motor) representations, recent accounts suggest top-down processes where prior knowledge guides perception of others’ actions, in a predictive manner. This thesis investigated how person-specific models of others’ typical behaviour in different …
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