Tesis: "Mirror system"

1

Moonens, Sofie. "Mirror Neurons : The human mirror neuron system". Thesis, Högskolan i Skövde, Institutionen för kommunikation och information, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-6103.

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This literature review explores human mirror neurons from several angles. First it retells mirror neuron history, from the initial discovery in the macaque monkey research through to the experiments determining if there is a human brain homologue. Then the merits of two opposing evolutionary views – mirror neurons as an adaptation or an association, here referring to an adaptation’s byproduct – are discussed. Lastly the autistic mirror neuron dysfunction hypothesis – stating that a faulty mirror neuron system is at the basis of autistic behavioral patterns – is examined for its validity but ultimately found lacking and in need of further development.

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2

Westlund, Kristina. "The Mirror Neuron System and Its Role in Autism Spectrum Disorder". Thesis, University of Skövde, School of Humanities and Informatics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-3128.

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The discovery of mirror neurons and the mirror neuron system is one of the most interesting breakthroughs in the field of neuroscience in recent years. The topic stretches over a wide spectrum of research fields but one of the more prominent areas is concerned with the role of mirror neurons in autism spectrum disorder. It is hypothesized that an impaired mirror neuron system may be one of the main causes underlying the deficits seen in autistic individuals. Parallel to the broken mirror theory of autism there are critical voices claiming there is not enough empirical evidence to support such a theory. Research carried out in the area seems to offer support for both contradictory approaches making it hard to conclude the definite role of mirror neurons in this developmental disorder. Future research may offer conclusive answers concerning the role of the mirror neuron system in autism spectrum disorder as well as other important questions regarding the functional properties of the brain areas under question.

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3

Catmur, C. "Effects of sensorimotor learning on the human mirror neuron system". Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/1445997/.

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The discovery, in the monkey, of "mirror" neurons, which fire in response both to the performance and to the observation of specific actions, has prompted extensive research into their properties, and into the possible functions of a putative mirror neuron system in humans. Little is known, however, about how such neurons acquire their matching properties. This thesis addresses this question using a variety of techniques. Imitation is one of the key processes thought to be subserved by the mirror neuron system Chapter 3 shows that automatic imitation effects are separable from spatial compatibility effects. This establishes automatic imitation effects as suitable targets for experimental manipulations of mirror neuron system function. Strengthening this conclusion, Chapter 4 indicates that automatic imitation effects can be delayed by repetitive theta burst transcranial magnetic stimulation (TMS) of the inferior frontal gyrus, an area homologous with the premotor F5 mirror neuron area in the macaque. In Chapter 5, single-pulse TMS is used to produce motor evoked potentials (MEPs). In an action observation experiment, an automatic muscle-specific "mirror" effect is shown: the size of the MEP in a given muscle is sensitive to the identity of the muscle that would be used to perform the observed movement. It is then demonstrated that this effect can be reversed following a period of incompatible sensorimotor training. This result is built upon in Chapter 6: it is shown behaviourally that incompatible sensorimotor training can reduce automatic imitation effects, and, using functional magnetic resonance imaging, that it can reverse neural responses to observed actions in the human mirror neuron system. It is concluded that sensorimotor learning can reconfigure the human mirror neuron system, and that it is, therefore, a mechanism through which the mirror neuron system can acquire its ability to match observed with performed actions.

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4

Macgregor, Andrew Alan. "The laser mirror alignment system for the LHCb RICH detectors". Thesis, University of Glasgow, 2006. http://theses.gla.ac.uk/1732/.

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The Large Hadron Collider beauty (LHCb) experiment at the Large Hadron Collider (CERN), is the next generation B physics experiment designed to precisely constrain the Cabibbo-Kobayashi-Maskawa (CKM) matrix measurements with unprecedented accuracy, as well as search for new physics. The success of the LHCb experiment relies upon excellent particle identification. The central particle identification detectors for the LHCb experiment are the Ring Imaging Cherenkov (RICH) detectors which are reliant upon their optics being well aligned. The optical specifications for the second RICH detector (RICH2) are for the mirrors to be aligned to within 0.1 mrad so as not to degrade the inherent 0.7 mrad resolution of the detector. As the mirrors move out of alignment over time, the performance of the RICH will deteriorate, unless corrected. This thesis describes the design and characterisation of the Laser Mirror Alignment Monitoring System and its image analysis software for selected mirrors of RICH2. This thesis also describes the results of a unique method of combining data from the Laser Mirror Alignment Monitoring System and Tracking system, to recover the positions of all mirror segments in the RICH2 detector. The laser alignment monitoring system resolution has been measured to be 0.013 mrad for both θy and θx rotations, with a long term stability of 0.014 mrad in θy and 0.006 mrad in θx. The resolution of the final mirror alignment procedure using data tracks is 0.18 mrad for θy mirror rotations and 0.12 mrad for θx mirror rotations.

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5

Woodruff, Rick Bryan. "A two axis mirror positioning system with quadrature encoder output". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40932.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.
Includes bibliographical references.
This project was conducted in support of a solar concentrating technology that required the design and construction of a low cost, two axis rotational drive system with a resolution of one degree or better. The scope of this project was to design and build a two axis drive system capable of supporting a 20" square acrylic mirror. Cost, reliability, and the ability to be built by students using student resources were of primary concern. The primary design concern was the development of a low cost feedback system. Several different feedback sensors were considered, and a quadrature encoder was chosen. To reduce cost, the encoder disk was made from an overhead transparency with a slotted image printed on it. The required encoder accuracy was 1.0 degree, and a measured accuracy of 0.85 degrees was achieved. The encoder was designed with an optimum accuracy of 0.55 degrees per transition and the observed discrepancy in resolution is primarily due to high tolerances that could not be met with hand assembly.
by Rick Bryan Woodruff.
S.B.

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6

Behmer, Lawrence P. Jantzen Kelly J. "Reading sheet music activates the mirror neuron system of musicians : an EEG investigation /". Online version, 2010. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=342&CISOBOX=1&REC=16.

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7

Cagatay, Kartal. "Modeling, Identification And Real Time Position Control Of A Two-axis Gimballed Mirror System". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12611668/index.pdf.

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This work focuses on modeling, parameter estimation, and real-time position control of a two axis Gimbaled Mirror System (GMS) which is designed and manufactured to move an IR spot generated by an Infra Red Scene Generator System (IRSGS) in two orthogonal axes (elevation and azimuth) within the IR scene which is also generated by the IRSGS. Mathematical models of the GMS, the control system, and the disturbance torque originated from the movements of Flight Motion Simulator (FMS), on which the IRSGS will be mounted, are constructed using MATLAB®
/Simulink®
and MATLAB/Simulink/SimMechanics®
. Parameter estimations of the GMS and control system elements are achieved using MATLAB/Simulink Parameter Estimation Tool®
. The controller tuning is performed using the developed mathematical models in MATLAB/Simulink environment. Optimized digital PID controllers are implemented in the real-time control system. Performances of the controllers for both GMS axes are evaluated by both real system tests and simulation runs
and the results of these runs are compared. Controller performances under the effect of disturbances are analyzed by using the mathematical models developed in the MATLAB/ Simulink environment.

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8

Marais, Ade. "Neurocorrelates of the Mirror Neuron System in Children with Chromosome 22q11.2 Deletion Syndrome". ScholarWorks@UNO, 2017. https://scholarworks.uno.edu/td/2422.

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Activation of brain regions that make up the mirror neuron system (MNS) is thought to reflect processing and perceiving behavior, action, and intentionality of other organisms. Sensing and perceiving motor behavior in others is an important component of understanding and participating in social interactions. Children with chromosome 22q11.2 deletion syndrome (22q11.2DS) are diagnosed with serious medical, cognitive, and socio-emotional symptoms. Atypical development and function of the MNS may underpin some aspects of socio-emotional impairment and autism spectrum disorder (ASD)-like symptomology reported. This study of the MNS investigates differences in activation in the operculum, sensorimotor areas, and basal ganglia (BG) in children with 22q11.2DS compared to typically-developing (TD) controls. Twenty-nine children (22q11.2DS: n=15; TD: n=16) between ages 7-16 viewed videos of a human hand manipulating various household objects during a functional magnetic resonance imaging (fMRI) scan. In Analysis 1, children with 22q11.2DS had less extensive brain activation than TD children in the operculum, sensorimotor areas, and BG. In Analysis 2, children with 22q11.2DS had the same results as Analysis 1 with the exception of sensorimotor areas not being highly active in either group. In both analyses, fMRI signal change from baseline to video did not differ significantly between groups. Processing efficiency in children with 22q11.2DS may be lower or more variable when compared to TD peers. This is the first study comparing children with 22q11.2DS to TD peers specifically looking at MNS activation within the operculum region to assess higher cognitive functioning, somatosensory cortex for sensory interpretation, and basal ganglia for gross motor activity. Future studies should compare brain activation between children with ASD and those with 22q11.2DS during an MNS task as the next step to further clarify the origin of ASD symptoms reported in this population.

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9

Argueta-Diaz, Victor. "Proof of feasibility of a free-space optical cross-connect system using digital mems". The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1109795698.

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10

Puzzo, Ignazio. "Individual differences in the human mirror neuron system : electroencephalographic and transcranial magnetic stimulation investigations". Thesis, University of Essex, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528858.

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11

Chun-Lin, Louis Chang. "High Intensity Mirror-Free Nanosecond Ytterbium Fiber Laser System in Master Oscillator Power Amplification". Thesis, National Taiwan University (Taiwan), 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3583082.

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Rare-earth-doped fiber lasers and amplifiers are relatively easy to efficiently produce a stable and high quality laser beam in a compact, robust, and alignment-free configuration. Recently, high power fiber laser systems have facilitated wide spread applications in academics, industries, and militaries in replacement of bulk solid-state laser systems. The master oscillator power amplifier (MOPA) composed of a highly-controlled seed, high-gain preamplifiers, and high-efficiency power amplifiers are typically utilized to scale up the pulse energy, peak power, or average power. Furthermore, a direct-current-modulated nanosecond diode laser in single transverse mode can simply provide a compact and highly-controlled seed to result in the flexible output parameters, such as repetition rate, pulse duration, and even temporal pulse shape. However, when scaling up the peak power for high intensity applications, such a versatile diode-seeded nanosecond MOPA laser system using rare-earth-doped fibers is unable to completely save its own advantages compared to bulk laser systems. Without a strong seeding among the amplifiers, the guided amplified spontaneous amplification is easy to become dominant during the amplification, leading to the harmful self-lasing or pulsing effects, and the difficulty of the quantitative numerical comparison. In this dissertation, we study a high-efficiency and intense nanosecond ytterbium fiber MOPA system with good beam quality and stability for high intensity applications. The all-PM-fiber structure is achieved with the output extinction ratio of >12 dB by optimizing the interconnection of high power optical fibers.

The diode-seeded MOPA configuration without parasitic stimulated amplification (PAS) is implemented using the double-pass scheme to extract energy efficiently for scaling peak power. The broadband PAS was studied experimentally, which matches well with our numerical simulation. The 1064-nm nanosecond seed was a direct-current-modulated Fabry-Pérot diode laser associated with a weak and pulsed noise spanning from 1045 to 1063 nm. Even though the contribution of input noise pulse is only <5%, it becomes a significant transient spike during amplification. The blue-shifted pulsed noise may be caused by band filling effect for quantum-well seed laser driven by high peak current. The study helps the development of adaptive pulse shaping for scaling peak power or energy at high efficiency. On the other hand, the broadband spike with a 3-dB bandwidth of 8.8 nm can support pulses to seed the amplifier for sub-nanosecond giant pulse generation.

Because of the very weak seed laser, the design of high-gain preamplifier becomes critical. The utilization of single-mode core-pumped fiber preamplifier can not only improve the mode contrast without fiber coiling effect but also significantly suppress the fiber nonlinearity. The double-pass scheme was therefore studied both numerically and experimentally to improve energy extraction efficiency for the lack of attainable seed and core-pumped power. As a result, a record-high peak power of > 30 kW and energy of > 0.23 mJ was successfully achieved to the best of our knowledge from the output of clad-pumped power amplifier with a beam quality of M² ∼1.1 in a diode-seeded 15-µm-core fiber MOPA system. After the power amplifier, the MOPA conversion efficiency can be dramatically improved to >56% for an energy gain of >63 dB at a moderate repetition rate of 20 kHz with a beam quality of M² <1.5. The output energy of >1.1 mJ with a pulse duration of ∼6.1 ns can result in a peak power up to >116 kW which is limited by fiber fuse in long-term operation. Such a condition able to generate the on-target laser intensity of > 60 GW/cm² for applications is qualified to preliminarily create a laser-plasma light source. Moreover, the related simulation results also reveal the double-passed power amplifier can further simplify MOPA.

Such an intense clad-pumped power amplifier can further become a nonlinear fiber amplifier in all-normal dispersion instead of a nonlinear passive fiber. The combination of laser amplification and nonlinear conversion together can therefore overcome the significant pump depletion during the propagation along the passive fiber for power scaling. As a result, an intense spectrum spanning from 980 to 1600 nm as a high-power nanosecond supercontinuum source can be successfully generated with a conversion efficiency of >65% and a record-high peak power of >116 kW to the best of our knowledge. Because of MOPA structure, the influence of input parameters of nonlinear fiber amplifier on supercontinuum parameters can also be studied. The onset and interplay of fiber nonlinearities can be revealed stage by stage. Such an unique and linearly-polarized light source composed of an intense pump and broad sideband seed is beneficial for efficiently driving the broadband tunable optical parametric amplification free from the bulkiness and timing jitter.

Keywords: High power fiber laser and amplifier, ytterbium fiber, master oscillator power amplification, parasitic stimulated amplification, multi-pass fiber amplification, peak power/pulse energy scaling, fiber nonlinear optics, supercontinuum generation.

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12

Evanchu, Hilderman Courtney. "Music and movement : the influence of tempo on the mirror neuron system in children". Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/52709.

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BACKGROUND: The mirror neuron system (MNS) is a neurological network associated with action-perception coupling, and is influenced by previous experiences. Visual, auditory, multi-modal, congruent and incongruent stimuli have been shown to modulate the response of the MNS throughout the various stages of human development. The musical attribute of tempo may exert a specific influence on action perception but this has not been studied in children. PURPOSE: The overarching purpose of this research is to explore the neurological interactions of music and action. This study asks the question, “How does the tempo of regular pulse influence perception of action in children?” METHODS: This research reflected on music and the MNS within the framework of dynamic systems theory (DST). A literature review examined the research relevant to the study question. Finally, a pilot study compared the responses in the MNS of 10 children during exposure to stimuli with tempi of 40 beats per minute (BPM) and 173BPM by examining the relative power of the mu rhythm frequency band (8-13Hz) in the sensorimotor cortex. RESULTS: Previous research suggests tempo significantly influences executed movements, cortical excitability, perception of emotion in music, and perception of synchrony in audio-visual stimuli. The pilot study identified significant mu suppression in the left sensorimotor cortex during visual conditions only, whereas the right sensorimotor cortex demonstrated significant mu suppression during auditory, visual and multi-modal conditions. In the left hemisphere, visual stimuli showed significantly greater mu suppression than auditory stimuli. In the right hemisphere, visual stimuli with a tempo of 173BPM showed significantly greater mu suppression than auditory stimuli with a tempo of 40BPM. The covariates of age, musical experience and dance experience were identified to have significant interactions with conditions. CONCLUSIONS: This pilot study provided the first evidence that visual stimuli result in stronger mu suppression compared to auditory stimuli in typically developing children, similar to that found in adults. Increased tempo was associated with stronger action-perception coupling for uni-modal stimuli. This study lacked statistical power to demonstrate differences between multi-modal stimuli exhibiting equivalent or differing tempi; further research with larger samples is needed to explore these influences.
Medicine, Faculty of
Graduate

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13

Correia, Valter Gil Gonçalves. "Modular prototype of a smart mirror with voice interaction". Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23485.

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Mestrado em Engenharia de Computadores e Telemática
O mundo está em constante evolução e nos últimos anos tem sido possivel ver um grande aumento de dispositivos electrónicos, presentes no nosso quotidiano, com ligação à internet, a chamada revolução da internet das coisas. Um dispositivo que se enquadra neste grupo e que está a ganhar bastante atenção por parte da comunidade em geral é o espelho inteligente. Os espelhos inteligentes são espelhos que permitem a uma pessoa ver, para além da sua reflexão, informação relevante com base nos seus interesses. O objectivo desta dissertação é a criação de um sistema que possibilite a visualização desta informação, a interação do utilizador com o sistema e possibilidade da sua customização de acordo com as preferências do utilizador. O sistema proposto dá vida ao espelho através de módulos que as pessoas podem instalar e configurar de acordo com as suas necessidades. Os vários módulos interagem com o sistema principal, através de filas de mensagens, que são usadas para fornecer informação pronta a ser visualizada e obter do sistema dados providenciados pelo utilizador e pelos sensores existentes. Para proporcionar interacção com o espelho, foi implementado reconhecimento de comandos usando voz. Foi também criada uma página de configuração onde é possível arrastar e largar módulos para modificação da sua posição assim como alterar parâmetros dos módulos existentes. Desta dissertação resultou um protótipo de um espelho inteligente modular com interacção por comandos de voz. A sua modularidade permite a criação de novos módulos num grande número de linguagens de programação, podendo o programador escolher a que mais se adequa à funcionalidade implementada pelo módulo. Foram realizados testes de usabilidade tendo sido obtidos resultados de satisfação que comprovam a qualidade do protótipo desenvolvido
The world is in constant evolution and in recent years it is possible to see a great increase in the number of electronic devices, present in our everyday life, connected to the internet, the so called internet of things revolution. A device that fits in this group and that is gathering great acceptance from people in general is the smart mirror. Smart mirrors are mirrors that allows a person, besides seeing his reflection, to obtain relevant information to his interests. The objective for this thesis is the development of a system that permits the visualization of this information, the interaction of the user with the system and that makes itself capable of being modified and configured based on the users’ preferences. The proposed system brings life to a simple mirror through modules that are available for installation and configuration based on the users’ needs. These modules interact with the main system through message queues, that are used both to supply ready-to-be seen information and to obtain data from the user as well as from the existing sensors. The recognition of voice commands was also developed to allow user interaction with the mirror. Additionally, a configuration page was developed as well, which can be used to modify the position and parameters of the existing modules using a drag and drop approach. From this thesis resulted a modular smart mirror prototype that can be interacted with using voice commands. The modularity of this system allows the development and integration of new addons in a vast number of programming languages, giving the developer the option and power to choose the language that best suits the module functionality. Usability tests were conducted and satisfaction results were obtained that confirms the quality of the developed prototype.

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14

Huang, Lei, Chenlu Zhou, Mali Gong, Xingkun Ma y Qi Bian. "Development of a novel three-dimensional deformable mirror with removable influence functions for high precision wavefront correction in adaptive optics system". SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622017.

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Deformable mirror is a widely used wavefront corrector in adaptive optics system, especially in astronomical, image and laser optics. A new structure of DM-3D DM is proposed, which has removable actuators and can correct different aberrations with different actuator arrangements. A 3D DM consists of several reflection mirrors. Every mirror has a single actuator and is independent of each other. Two kinds of actuator arrangement algorithm are compared: random disturbance algorithm (RDA) and global arrangement algorithm (GAA). Correction effects of these two algorithms and comparison are analyzed through numerical simulation. The simulation results show that 3D DM with removable actuators can obviously improve the correction effects.

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15

Unal, Ugur. "Optomechanical Analysis And Experimental Validation Of Bonding Based Prism And Mirror Mounts In A Laser System". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614161/index.pdf.

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In this thesis, different optomechanical design and adhesive configurations for mounting mirrors and prisms used in a laser system are investigated. Maintaining stability and strength of optical components of a laser device is difficult especially if the system is to be used in military environment. In order to determine the strength of prism mounts to high acceleration levels, mathematical correlations derived by Yoder are used. By use of these mathematical correlations, safety factor of different prism mounts and adhesive configurations are calculated for an acceleration level of 40g. So as to decide most stable mirror mount and adhesive configuration, several experiments are conducted. For the experiments, 5 different optomechanical mounts are designed. Then, 25 mirrors are bonded to the designed mounts with 5 different adhesives. These experiments are done to simulate harsh military environmental conditions such as thermal shock, mechanical vibration and mechanical shock. In the experiments, angular movement of mirrors due to adhesive cure, thermal shock, mechanical vibration and mechanical shock are monitored. Thermal shock is applied between -40º
C and 70º
C with a temperature change of 22º
C/min. On the v other hand, mechanical vibration of 14 grms and mechanical shock of 40g for 6 ms is applied in the experiments. Shortly, this study is done for determination of the most stable mirror and prism mount design and adhesive combination of a laser system subjected to extremely harsh environments.

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16

Samson, G. "Observing actions after stroke : investigating the potential of the mirror neuron system as a rehabilitation tool". Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/1445835/.

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Motor impairments are a common consequence of stroke, but some patients may be too impaired to participate in physiotherapy. In primates, single cell recordings have identified neurons that are active during both performance and observation of motor tasks. A similar "mirror neuron system" (MNS) in humans could potentially be utilised to augment physiotherapy in stroke patients. This paper summarises the mechanisms underlying recovery from stroke, before reviewing evidence for the existence of a human MNS. Converging evidence demonstrates that in healthy individuals, observation of another's actions activates a distributed network of brain areas, and can facilitate motor output. Preliminary findings suggest that action observation may also improve motor performance in stroke patients. Further research is required to determine the mechanisms underlying action observation in stroke patients, in order to establish its potential as a rehabilitation technique.

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17

Choi, Heejoo, Isaac Trumper, Matthew Dubin, Wenchuan Zhao y Dae Wook Kim. "Simultaneous multi-segmented mirror orientation test system using a digital aperture based on sheared Fourier analysis". OPTICAL SOC AMER, 2017. http://hdl.handle.net/10150/625706.

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This paper presents a simultaneous multi-segmented mirror orientation test system (SMOTS) using localized sheared images. A CMOS camera captures images of reflected 2D sinusoidal patterns from the test mirrors as their orientation changes. Surface orientation is measured to within 0.8 mu rad (0.16 arcseconds) for a flat mirror. In addition, we measure the variation of seven mirror segments simultaneously. Furthermore, SMOTS is applied to measure the orientation of two concave mirrors with an accuracy of 2.7 mu rad (0.56 arcseconds). The measurement time for seven segments is 0.07 s. This technique can monitor the mirror segment orientation in an open/closed-loop for various optical setups. (C) 2017 Optical Society of America

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18

Bai, Yu. "Characterization of an Adaptive Optics System for Vision Studies". University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1461796856.

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19

Kawahara, Ryo. "A Novel Catadioptric Ray-Pixel Camera Model and its Application to 3D Reconstruction". Kyoto University, 2019. http://hdl.handle.net/2433/242435.

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20

Schmidt, Stephanie Nicole Lyn [Verfasser] y Peter [Akademischer Betreuer] Kirsch. "Neural mechanisms of social cognition – the mirror neuron system and beyond / Stephanie Nicole Lyn Schmidt ; Betreuer: Peter Kirsch". Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1205976841/34.

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21

Zelazo, Daniel L. (Daniel Lev-Ari) 1977. "Study of a MEMS laser range finder : integration, performance and design of a 2-axis mirror control system". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/86839.

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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
Includes bibliographical references (p. 143-144).
by Daniel L. Zelazo.
M.Eng.

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22

Zeghoudi, Anne-Céline. "Critique de la raison neurologique". Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST0060.

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La discipline neurologique met en présence des soignants sains et des patients frappés de handicaps extrêmes auxquels le progrès médico-technique, fondé au XVIIe sur la mathématisation de la nature et le modèle du « corps-machine », n’a pas mis de terme. Comment se représenter l’aphasie, l’anosognosie, les altérations motrices et sensorielles chez autrui ? On se réfèrera aux travaux de Husserl et aux phénoménologues du corps pour approcher le mystère du vécu de la chair dans la maladie neurologique autrement que la sémiologie conventionnelle l’enseigne. Ce contact bouleversant avec les grands cérébrolésés n’est pas exempt d’intérêt, voire de jouissance : le spectacle du dépouillement humain par la perte du langage, du mouvement ou d’autres attributs, pourrait, dans un effet de miroir, et par une « association accouplante », permettre au témoin ici neurologue de se démonter lui-même et tendre vers l’élucidation de sa propre chair. Mais le système nerveux, par quoi la douleur ou le plaisir se manifestent à la conscience et au corps, qui afflige en même tant qu’il est affligé, est condamné à la forclusion du fait de son rôle nécessaire de médiateur physiologique. L’exclusivité d’une visée intentionnelle, dénoncée par Michel Henry, soutenue et entretenue par l’essor hégémonique de l’imagerie médicale, semble manquer ici la souffrance insoluble dans la donation extatique. Ce travail qui proposait, dans une démarche critique, de revisiter les soubassements du savoir neurologique, nous conduit vers une aporie : quelle est la phénoménologie du handicap neurologique s’il ne s’écrit ni ne se lit en termes positifs ? Devant l’insuffisance du logos à dire les altérations du monde et des vécus de la chair, s’invitent la réserve puis la métaphore artistique. C’est spécifiquement le travail du peintre Simon Hantaï qui ouvrira une voie entre phénomène mondain et incarnation. Il s’agira avec lui, dans un renoncement au savoir totalisant, d’apprendre à mettre en perspective les données des neurosciences et, ce que ni la science ni l’empathie pour autrui ne peuvent expliciter. Nous suggèrerons d’intégrer à la pratique médicale neurologique une démarche éthique autrement appelée « sagesse des limites » ; limites entre les savoirs, dont la figure toujours complexe, instable et miroitante, n’est pas sans évoquer une dimension baroque de la neurologie
[Summary made by Reverso] The neurological discipline puts in the presence of nursing healthy and patients struck by extreme handicaps in which the medical technical progress, based(established) in the XVIIth on the mathématisation of the nature and the model of the "body-machine", did not put term. How to represent itself the aphasia, the anosognosie, the driving and sensory changes to others? We shall refer to the works of Husserl and to the phénoménologues of the body to approach the mystery of the real-life experience of the flesh in the neurological disease otherwise than the conventional semiology teaches him(it). This contact upsetting with the cérébrolésés big is not exempt from interest, even from enjoyment: the show(entertainment) of the human perusal by the loss of the language, the movement or the other attributes, could, in an effect of mirror, and by an accouplante " association ", allow the witness(baton) here neurologist to get confused itself and to aim towards the clarification of its own flesh. But the nervous system, by which the pain or the pleasure show themselves in the consciousness and in the body, which saddens even so much that it is saddened, is condemned to the debarment because of its necessary role of physiological mediator. The exclusivity of a deliberate aim, denounced(cancelled) by Michel Henry, supported and maintained by the hegemonic development of the medical imaging, seems to miss here the insoluble suffering in the ecstatic donation. This work which suggested, in a critical approach(initiative), revisiting the bases of the neurological knowledge, leads(drives) us towards an aporia: what is the phenomenology of the neurological handicap if he does not spell nor is read in positive terms? In front of the insufficiency of logos to say the changes of the world and the real-life experiences of the flesh, invite each other the reserve then the artistic metaphor. It is specifically the work of the painter Simon Hantaï that will open a way between worldly phenomenon and embodiment. It will be a question with him, in a renunciation of the adding up knowledge, of learning to put in perspective the data of the neurosciences and, what neither the science nor the empathy for others can clarify. We shall suggest to integrate(join) into the neurological medical practice an ethical otherwise called approach(initiative) " wisdom of the limits "; limits between the knowledges, the face(figure) of which always complex, unstable and gleaming, is not without evoking a baroque dimension(size) of the neurology

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23

Strahler, Jeremy A. "Integration of an active optical system for Flexlab". Ohio : Ohio University, 2000. http://www.ohiolink.edu/etd/view.cgi?ohiou1173204753.

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24

Da, Silva Cameirao Mónica. "Virtual Reality based stroke neurorehabilitation: Development and Assessment of the Rehabilitation Gaming System". Doctoral thesis, Universitat Pompeu Fabra, 2010. http://hdl.handle.net/10803/7568.

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Donat el nivell d'incidència i impacte de l'ictus, hi ha la necessitat de trobar mètodes de rehabilitació més automatitzats que els actuals. Un candidat prometedor és la Realitat Virtual, on múltiples sistemes ja han estat proposats. Malauradament, encara no és coneixen exactament quins són els beneficis d'aquests sistemes en comparació amb mètodes de rehabilitació convencionals. Aquí presentem el raonament, disseny, desenvolupament i resultats en l'impacte clínic d'un d'aquests sistemes, el Rehabilitation Gaming System (RGS). El RGS combina conceptes d'execució i observació d'accions amb una avaluació psicomètrica per proporcionar un entrenament personalitzat i automatitzat al pacient d'ictus. El RGS s'adapta al usuari d'una manera efectiva, i així permet l'aplicació de protocols de rehabilitació personalitzats amb una supervisió mínima. Els nostres resultats mostren que la rehabilitació amb el RGS facilita la recuperació funcional de les extremitats superiors en les fases aguda i crònica de l'ictus, i que per aquest motiu, el RGS és una eina valuosa per a la rehabilitació.

Given the high incidence and impact of stroke, the need has arisen to find more automated and self-managed rehabilitation approaches. A promising candidate is the use of Virtual Reality, and a number of systems have been proposed. Thus far, however, it is not clear what the benefits of these systems are when compared to conventional methods. Here we present the rationale, development and results on the clinical impact of one such system, the Rehabilitation Gaming System (RGS). RGS combines concepts of action execution and observation with a psychometric evaluation to provide a personalized and automated training. The RGS effectively adjusts to the individual features of the user, allowing for a minimally supervised deployment of individualized rehabilitation protocols. Our results show that rehabilitation with the RGS facilitates the functional recovery of the upper extremities in the acute and chronic stages of stroke, and that this system is therefore a valuable tool for rehabilitation.

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25

Yan, Meng, Lei Huang, Qi Bian, Chenlu Zhou, Xingkun Ma y Mali Gong. "Location-grouping algorithm based on limited actuators deformable mirror for high precision wavefront aberration correction in adaptive optics system". SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622051.

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The aberration in the center position of wavefront can be corrected well when the deformable mirrors (DM) used in high-resolution adaptive optics system of telescope. However, for the defocus and spherical aberration of telescope, the four corners of the wavefront cannot be corrected well. A novel correction method with different levels and regions of deformable mirror is proposed to solve this problem. The control elements of wavefront in four corners are divided. And every four or five DM units in one corner is in a group. Compared with conventional correction method, the location-grouping method showed significant advantages in correction of different order aberrations.

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26

Berntsen, Monica. "Transcranial alternating current stimulation to areas associated with the human mirror neuron system reveals modulation to mu-suppression and corresponding behaviour". Thesis, University of Essex, 2016. http://repository.essex.ac.uk/17734/.

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This study was carried out in order to validate the use of EEG mu (μ) suppression as an index of human mirror neuron system (hMNS) related activity. The hMNS is characterized by neuronal activity that responds to both action observation and execution of the same movement. This activity has been directly observed in both macaque monkeys and in humans. There is an abundance of studies using indirect measures of neuronal activity to indicate hMNS-related activity such as TMS, fMRI/PET and EEG/MEG. However, relating indirect indices of neuronal activity to a conceptual group of neurons is controversial because the activity observed could also reflect other neuronal processes. Therefore, the current thesis was designed to establish more direct and causal evidence for the use of EEG in indicating hMNS-related activity through the use of transcranial alternating current stimulation (tACS). This was achieved in six experiments; the first three established an efficient protocol to induce μ-suppression during action observation, and the last three demonstrated by means of tACS that activity in hMNS-related areas is directly related to μ-reactivity during observation of motor movements and in relation to imitation of the movement observed. To this extent, μ-suppression was related to both action observation, and the ability to perform the movement observed. This is interpreted as evidence that EEG μ-suppression is a valid indicator of hMNS-related activity.

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27

Ji, Wei. "Viewing Options for the Virtual Haptic Back (VHB)". Ohio University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1125440000.

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28

Bendarouach, Jordan [Verfasser]. "Conception and design of a mirror alignment and control system for the Ring Imaging Cherenkov detector of the CBM experiment / Jordan Bendarouach". Gießen : Universitätsbibliothek, 2019. http://d-nb.info/1190559757/34.

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29

Vizcarra, Casas Christopher Alonso y Quevedo Gabriel Alejandro Medina. "Implementación de un asistente virtual de modas con el uso de una cámara Kinect v2 y procesamiento de imágenes". Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/653659.

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Este artículo trata sobre la problemática y el desarrollo de un asistente virtual de moda propuesto mediante el uso de una cámara Kinect v2 y procesamiento de imágenes, para tiendas minoristas de moda. Surge principalmente como una respuesta a la incapacidad de proporcionar experiencias únicas durante el proceso de compra mediante el uso de diversos dispositivos. Debido a esto, se analizaron soluciones de asistente virtual similares orientadas a proporcionar recomendaciones de vestimenta para poder proporcionar un software que podría dar una sugerencia más personalizada para los usuarios basándose en sus características físicas. La validación del modelo se realizará a través de la experiencia de un grupo de usuarios en el momento del uso del asistente virtual y expertos en el área de evaluación de moda.
This article is about the problematic and development of a fashion virtual assistant proposed by using a Kinect v2 camera and image processing, for fashion retail stores. It comes up mainly as a response to the inability of providing unique experiences during the shopping process through the use of diverse devices. Because of this, similar virtual assistant solutions oriented to provide clothing recommendations were analysed to be able to provide a software that could give a more personalized suggestion for the users basing in their physical characteristics. The model validation will be done through the experience of a group of users at the moment of use of the virtual assistant and experts in the fashion assessment area.
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30

Schwarzburg, Stefan [Verfasser] y Andrea [Akademischer Betreuer] Santangelo. "A Mirror Alignment Control System for Phase II of the HESS Experiment and A Morphology Study of HESSJ1837-069 / Stefan Schwarzburg ; Betreuer: Andrea Santangelo". Tübingen : Universitätsbibliothek Tübingen, 2012. http://d-nb.info/1162843179/34.

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31

Vizcarra, Christopher, Gabriel Medina y Alfredo Barrientos. "Implementation of a Fashion Virtual Assistant with the Use of a Kinect v2 Camera and Image Processing". Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/653792.

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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.
This article is about the problem and development of a fashion virtual assistant proposed by using a Kinect v2 camera and image processing, for fashion retail stores. It comes up mainly as a response to the inability of providing unique experiences during the shopping process through the use of diverse devices. Because of this, similar virtual assistant solutions, oriented to provide clothing recommendations, were analyzed to be able to provide software that could give a more personalized suggestion for the users based on their physical characteristics.
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32

Lin, Qinglong. "Etude, modélisation dynamique et développement d'un capteur solaire thermique à concentration de nouvelle génération". Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10099.

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Ce travail a pour objet de développer une nouvelle technologie de l’énergie solaire à concentration. Il porte sur la présentation du concept, la réalisation prototypique et l’étude optique et énergétique d’un nouveau concentrateur solaire QingSun™. Ce concentrateur a une forme de parallélépipède rectangulaire et comporte des lentilles de Fresnel linéaires, des parois tapissées de miroir et d’un récepteur solaire mobile entraîné par un système de suivi à l’intérieur du caisson de concentration. Un modèle optique et un modèle énergétique ont été élaborés et validés avec une série d’expériences. Ils ont permis d’étudier le fonctionnement et les performances énergétiques du concentrateur. Une étude de l’influence paramétrique de l’inclinaison et l’orientation a été effectuée et a montré que l’inclinaison a plus d’influence que l’orientation sur les performances. Enfin, les performances énergétiques optimales du concentrateur ont été estimées
This work is for the purpose to develop a new solar concentrating technology. It covers the presentation of the concept, the prototype realization and the optical and energy study of a new solar concentrator QingSun™. This concentrator has a shape of rectangular parallelepiped and includes linear Fresnel lenses, mirror-lined walls and a mobile solar receptor controlled by a tracking system inside the casing. An optical model and an energy model were developed and validated with a series of experiments. The both models permitted us to examine the function and the energy performance of the concentrator. A parametric study of the influence of the tilt and the orientation was performed and showed that the tilt had more influence than the orientation. Finally, the optimal energy performance of this concentrator was estimated

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33

Gottschall, Daniel [Verfasser] y Andrea [Akademischer Betreuer] Santangelo. "The Mirror Alignment and Control System of H.E.S.S. Phase II, and Observational Studies of TeV Shell Candidates and of the Nova Sgr 2015 No. 2 with H.E.S.S. / Daniel Gottschall ; Betreuer: Andrea Santangelo". Tübingen : Universitätsbibliothek Tübingen, 2018. http://d-nb.info/1168803926/34.

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34

Specht, Hendrik. "MEMS-Laser-Display-System". Doctoral thesis, Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-71334.

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In der vorliegenden Arbeit werden die im Zusammenhang mit der Strahlablenkung stehenden Systemaspekte der auf MEMS-Scanner basierenden Laser-Display-Technologie theoretisch analysiert und aus den Ergebnissen die praktische Implementierung eines Laser-Display-Systems als Testplattform vorgenommen. Dabei werden mit einem Ansatz auf Basis zweier 1D-Scanner und einem weiteren Ansatz mit einem 2D-Scanner zwei Varianten realisiert. Darüber hinaus erfolgt die Entwicklung eines bildbasierten Multiparametertestverfahrens, welches sowohl für den Test komplettierter Strahlablenkeinheiten bzw. Projektionsmodule als auch zum umfassenden und zeiteffizienten Test von MEMS-Scannern auf Wafer-Level geeignet ist. Mit diesem Verfahren erfolgt eine Charakterisierung der zwei realisierten Varianten des Laser-Displays. Ausgehend von den Eigenschaften des menschlichen visuellen Systems und den daraus resultierenden Anforderungen an das Bild sowie einer systemtheoretischen Betrachtung des mechanischen Verhaltens von MEMS-Scannern bildet die Ansteuersignalerzeugung für den resonanten Betrieb der schnellen und den quasistatischen Betrieb der langsamen Achse einen Schwerpunkt. Neben dem reinen digitalen Regler- bzw. Filterentwurf sowie mehreren Linearisierungsmaßnahmen beinhaltet dieser auch die Herleitung einer FPGA-basierten Videosignalverarbeitung zur Konvertierung von Scannpattern, Zeitregime und Auflösung mit einer entsprechenden Synchronisierung von Strahlablenkung und Lasermodulation. Auf Grundlage der daraus resultierenden Erkenntnisse über den Zusammenhang zwischen Scanner-/Systemparametern und Bildparametern werden Testbild-Bildverarbeitungsalgorithmus-Kombinationen entwickelt und diese, angeordnet in einer Sequenz, mit einem Kalibrierverfahren zu einem Testverfahren für MEMS-Scanner vervollständigt. Die Ergebnisse dieser Arbeit entstanden im Rahmen von industriell beauftragten F&E-Projekten und fließen in die andauernde Fortführung des Themas beim Auftraggeber ein.

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35

Ménoret, Mathilde. "Bases neuronales des interactions sociales non-verbales : implication du système moteur & hyperscanning". Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10267/document.

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Cette thèse s'est intéressée à l'impact des interactions sociales sur l'acitivité motrice, à la fois au niveau comportempentale et cérébral et de caractériser cette modulation au cours d'actions simultanées et d'actions conjointes. Dans un premier temps, nous avons étudié les effets de l'observation d'une activation sur l'exécution motrice. En couplant analyse cinématique et enregistrement EEG, nous avons mis en évidence que l'activation du système des neurones miroirs facilitait l'action seulement lorsque les événements d'exécution et d'observation étaient temporellement coordonnées. Dans un deuxième temps, nous avons cherché à meiux caractériser l'influence du contexte interactif sur l'activité cérébrale de deux participants d'une interaction grâce à une étude en double-EEG et cinématique. Grâce à la comparaison des activités cérébrales motrices intra- et inter-individuelles chez deux participants qui effectuaient ou observaient des actions isolées ou des actions conjointes, nous avons pu mettre en évidence des modulations de l'activité motrice similaires chez les deux particiapnts ainsi que certaines modulations spécifiques à la fois du contexte social (humain vs robot) et du rôle dans l'interaction. L'analyse inter-individuelle a par ailleurs mis en évidence un couplage entre les aires visuelles et motrices des deux particiapnts pendant la condition d'action conjointe. L'ensemble des résultats suggère que le système moteur permet un couplage fin entre les participants d'une interaction, à la fois au travers d'un couplage temporel qui pourrait faciliter l'interaction et également au travers d'une boucle d'action-perception formant une représentation commune de l'action conjointe
This research investigated the impact of social interaction on motor activity, both ona behavioural and cerebral level. More precisely, the aim of the thesis was to characterise this modulation during simultaneous actions, when two participants interact, jointly or not, and to determine its functions. First , we studied the effect of action observation on motor execution. Coupling kinematics analysis and EEG recording, we gave evidence that the temporal time course of motor system activation was crucial for motor interference. We found that motor performances were facilitated by the observation of an action, only when execution and observation events were temporally coordinated. Second, we sought to characterise the influence of an interactive context on brain activity of two interacting participants through the coupling of dual-EEG and kinematic recordings. Thanks to the comparison of intra- and inter-individual brain activity of two participants that observed or performed individual or joint actions, we were able to highlight modulations of cerebral motor activity common in both participants as well as modulations of brain activity specific to the social context (human vs robot) and the role in the interaction (actor vs observer). Moreover, the inter-individual analysis revealed a coupling between the two participants' visual and motor brain areas during the joint action condition. Taken toghther, these results suggest that the motor system allows a tight coupling between interacting participants, mediated by temporal coupling that could facilitate the interaction and through an action-perception loop forming a common motor representation of the joint action

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36

McKay, Stuart. "Advanced design of stretchable membrane mirrors and their use in 3-dimensional display systems". Thesis, University of Strathclyde, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366668.

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37

Correia, Rodolfo Dias. "Sistema de apoio a reablilitação neuromotora: modelo de acompanhamento remoto para a terapia do espelho". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-29032016-105948/.

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A terapia do espelho, técnica utilizada no tratamento de pacientes em reabilitação neurológica, tem mostrado bons resultados a um custo relativamente baixo. Nessa terapia, um espelho é colocado ao longo do plano sagital mediano do paciente entre os dois membros, superiores ou inferiores, com o intuito de transmitir estímulos visuais para o cérebro para induzir a ilusão dos membros em questão estarem se deslocando de forma síncrona. Considerando a simplicidade, os resultados obtidos e o baixo custo da terapia do espelho, neste trabalho exploramos recursos tipicamente disponíveis em dispositivos móveis do tipo tablet e smartphones para propor um modelo de acompanhamento remoto baseado na gravação e no compartilhamento de vídeos de sessões de terapia do espelho considerando dois tipos de usuários: terapeutas e pacientes. O modelo é apresentado na forma de um protótipo de um sistema de acompanhamento remoto de pacientes que utilizam a terapia do espelho em sua reabilitação. Especialistas avaliaram que o sistema apresenta grande potencial no auxilio à reabilitação de membros superiores, podendo ser utilizado por qualquer paciente em reabilitação pela terapia do espelho devido à sua facilidade de uso. Entre os trabalhos futuros viabilizados pela versão atual do sistema estão testes com pacientes em tratamento para verificação das implicações resultantes de sua utilização.
The mirror therapy technique used in the treatment of patients in neurological rehabilitation has shown good results in a relatively low cost. In this therapy, a mirror is placed along the median sagittal plane of the patient between the two limbs, higher or lower, in order to transmit visual stimuli to the brain to induce the illusion of the limbs are moving synchronously. Considering the simplicity, the results obtained and the low cost of mirror therapy in this work we explore resources available on mobile devices like tablet and smartphones to propose a remote monitoring model based on recording and sharing videos of mirror therapy sessions considering two types of users: therapists and patients. The model is presented as a prototype of a remote monitoring system of patients that use mirror therapy in their rehabilitation. Experts evaluated that the system presents great potential to aid in the rehabilitation of the upper limbs and may be used by any patient due to its ease of use. Among the future work made possible by the current version of the system are the patients tests verifying the implications of the system in the therapy.

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38

Tia, Banty. "Couplage perception-action et équilibre postural : approche fondamentale. Application de l'observation pour le réentrainement chez les sujets agés". Thesis, Dijon, 2011. http://www.theses.fr/2011DIJOS027.

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L’imitation volontaire est établie comme l’un des modes principaux d’acquisition des habiletés motrices. Il existe également une autre forme d’imitation, automatique et involontaire, étudiée initialement en psychologie sociale du fait de son interaction étroite avec les comportements pro-sociaux. Récemment, et sous l’influence de travaux des années 1990 mettant en lumière des substrats neuronaux communs à l’observation et à l’exécution du mouvement, les recherches scientifiques se sont concentrées sur cette notion d’imitation automatique et ont investigué, via différents paradigmes expérimentaux, les effets de facilitation et d’interférence entre mouvements observés et exécutés. Le travail réalisé dans le cadre de cette thèse vise à améliorer notre compréhension des mécanismes de contagion motrice et à identifier leurs applications possibles au réentraînement moteur. Dans une première étude, nous avons évalué l’impact de l’observation de mouvements de déséquilibre sur le balancement postural d’observateurs jeunes (24,5 ± 5 ans), sans troubles posturaux. Le contrôle de l’équilibre orthostatique fait principalement intervenir des structures sous-corticales pour le maintien du tonus postural et l’intégration multisensorielle. Ces substrats neuronaux seraient, de la même manière que les fonctions végétatives indépendantes du contrôle volontaire, plus facilement contaminés par les mouvements observés. Cependant, l’observation d’un déséquilibre sollicite également des mécanismes de régulation posturale, qui restreignent le balancement de l’observateur et se surajoutent à des processus inhibiteurs prévenant l’imitation compulsive des mouvements observés. Par conséquent, ce paradigme expérimental nous a permis de tester les limites des effets de contagion à partir d’une situation où les processus inhibiteurs et régulateurs de la posture étaient fortement sollicités. Cette étude nous a conduits à mettre en évidence une contamination du balancement postural des sujets par le déséquilibre observé, ce qui a confirmé l’importance et la prédominance des processus d’imitation. Ce résultat soulève des questions importantes en termes d’applications au réentraînement moteur chez les patients souffrant de troubles posturaux, en particulier chez les personnes âgées qui présentent une altération de leurs fonctions de stabilisation. En effet, si l’observation d’un déséquilibre conduit à une réaction de contagion motrice, il est vraisemblable qu’elle sollicite également des fonctions inhibitrices et régulatrices permettant la stabilisation de l’observateur. La visualisation répétée d’un déséquilibre peut-elle alors conduire à une amélioration de la stabilisation chez les personnes à risque ? Pour étudier cette question, il serait nécessaire de répéter ce protocole chez le public cible - les réponses pouvant être modulées par l’âge et les aptitudes motrices des personnes. Notre seconde étude visait à évaluer l’impact du répertoire moteur sur les réactions de contagion motrice. S’il est admis que le système moteur (contraintes biomécaniques, niveau d’expertise) affecte les processus perceptifs, son effet sur les réactions d’imitation automatique a été peu étudié. Nous avons analysé les réactions posturales d’observateurs jeunes (24,2 ± 3,7 ans), sains, face à des séquences de déséquilibre antéro-postérieur et médio-latéral. Les stratégies d’équilibration posturale sont associées à des contraintes différentes selon ces deux axes, avec une symétrie médio-latérale et une asymétrie antéropostérieure – asymétrie résultant d’une position du centre de masse en avant de l’articulation de la cheville, qui induit une sollicitation accrue des muscles du plan postérieur pour la stabilisation posturale. Un impact du système moteur sur le processus de contagion serait donc susceptible de se traduire par des réactions posturales différentes dans nos deux conditions d’observation. etc
Voluntary imitation is known as a major means of acquisition of motor skills. Besides, another form of imitation, automatic and involuntary, was initially more extensively studied in social psychology, perhaps because of its close interaction with prosocial behaviors. Recently, there was a renewal of interest in automatic imitation, following research works of the 1990s that highlighted common neural substrates for movement observation and execution. In this context, scientific studies started, through various experimental paradigms, to investigate facilitation and interference effects between observed and executed movements. Research work presented in this thesis aims to improve our understanding of the mechanisms involved in motor contagion and to identify their possible application to motor retraining. For this purpose, we evaluated, in our first study, the impact of observation of postural imbalance on body sway of young (24.5 ± 5 years), healthy observers. Postural control mainly relies on subcortical structures for maintaining postural tonus and ensuring multisensory integration. Similarly to vegetative functions that are independent of voluntary control, these neural substrates would be more easily contaminated by observed movements. However in response to observed imbalance, postural regulation mechanisms, superimposed to inhibitory processes that prevent compulsive imitation, restrain observers’ disequilibrium. Therefore, this experimental paradigm enabled us to test the limits of contagion mechanisms in a situation highly soliciting inhibitory and regulation processes. Our results led us to highlight a contagion effect of observed imbalance on subjects’ postural sway, which confirmed the importance of imitation processes. These results raise an important question in terms of applications for movement retraining in patients with postural disorders, more specifically in elderly patients with impaired stabilization functions. In effect, if observation of postural imbalance leads to a motor contagion response, it is also likely to solicit regulatory and inhibitory functions for observers’ postural stabilization. Thus, could repeated observation of such disequilibrium movements lead to an improvement of stabilization functions for subjects with postural deficits? To investigate this question, it will be necessary to repeat this protocol with the target population, since observers’ response is likely to vary with age and motor competences. To complete this work, we conducted a second study to assess the impact of the motor repertoire on motor contagion responses. Although it is widely accepted that the motor system (biomechanical constraints, level of expertise) affects perceptual processes, its effect on imitative responses has been little studied. We analyzed postural reactions of young (24.2 ± 3.7 years), healthy observers when presented with sequences of anteroposterior and medio-lateral imbalance. Postural equilibration strategies are associated with different constraints along these two axes, with a medio-lateral symmetry and an anteroposterior asymmetry – this latter asymmetry results from a location of the center of mass ahead of the ankle joint, which induces an increased solicitation of muscles from the posterior plane for stabilization. An impact of the motor system on the contagion process could therefore appear in the form of different postural responses in our two observation conditions. Our results indicated a greater contagion effect during observation of anteroposterior compared to medio-lateral imbalance. Postural contagion is therefore conditioned by observers’ equilibration strategy. In our third study, we considered using this contagion effect for perceptual training aimed at the maintenance and improvement of elderly subjects’ motor performances. The issue of an observational training device is especially relevant when considering people for whom physical exercise is limited due to fatigue or pain.etc

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39

Klos, Richard A. "Scattering from X-ray mirrors". Thesis, University of Leicester, 1987. http://hdl.handle.net/2381/35710.

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Scattering from X-ray Mirrors deals with the the phenomena observed when x-rays are reflected from high quality mirror surfaces at grazing incidence. The presence of micro- irregularities in the reflecting surface causes power to be deviated away from the specular direction and into the wings of the angular distribution of radiation. Both theoretical and experimental investigations are presented. The two principal theories of the scattering of electromagnetic radiation are reviewed and are shown to produce identical results in the smooth surface limit. The scalar theory is further developed so as to be applicable to a scattering surface which can be described by an arbitrary surface height distribution function for any surface autocovariance function. The theoretical advances reported suggest a means by which the surface height distribution statistics of mirror surfaces might be derived from experimental scattering measurements. The experimental work in the thesis deals with a scattering experiment designed to test these theoretical developments. The development work involved in the construction of the Variable Angle Scattering Experiment (VASE) is presented and the anomalous results obtained from scattering measurements from two test flat x-ray mirrors are discussed. A shadowing model is devised to account for the anomalous results from the VASE. The shadowing model is then shown to be in good agreement with the VASE data and with data from other scattering experiments. The shadowing model, which provides a means of measuring the properties of pure mirror surfaces, is further developed to enable measurements of surface structure on mirrors which have become specked with small sparse contaminant features, thus allowing highly sensitive estimates of contaminant density and height to be made.

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40

Shao, Yuhe. "Mems 3-D scan mirror for an endoscopic confocal microscope". Diss., Montana State University, 2005. http://etd.lib.montana.edu/etd/2005/shao/ShaoY1205.pdf.

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41

Specht, Hendrik. "MEMS-Laser-Display-System: Analyse, Implementierung und Testverfahrenentwicklung". Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2010. https://monarch.qucosa.de/id/qucosa%3A19558.

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In der vorliegenden Arbeit werden die im Zusammenhang mit der Strahlablenkung stehenden Systemaspekte der auf MEMS-Scanner basierenden Laser-Display-Technologie theoretisch analysiert und aus den Ergebnissen die praktische Implementierung eines Laser-Display-Systems als Testplattform vorgenommen. Dabei werden mit einem Ansatz auf Basis zweier 1D-Scanner und einem weiteren Ansatz mit einem 2D-Scanner zwei Varianten realisiert. Darüber hinaus erfolgt die Entwicklung eines bildbasierten Multiparametertestverfahrens, welches sowohl für den Test komplettierter Strahlablenkeinheiten bzw. Projektionsmodule als auch zum umfassenden und zeiteffizienten Test von MEMS-Scannern auf Wafer-Level geeignet ist. Mit diesem Verfahren erfolgt eine Charakterisierung der zwei realisierten Varianten des Laser-Displays. Ausgehend von den Eigenschaften des menschlichen visuellen Systems und den daraus resultierenden Anforderungen an das Bild sowie einer systemtheoretischen Betrachtung des mechanischen Verhaltens von MEMS-Scannern bildet die Ansteuersignalerzeugung für den resonanten Betrieb der schnellen und den quasistatischen Betrieb der langsamen Achse einen Schwerpunkt. Neben dem reinen digitalen Regler- bzw. Filterentwurf sowie mehreren Linearisierungsmaßnahmen beinhaltet dieser auch die Herleitung einer FPGA-basierten Videosignalverarbeitung zur Konvertierung von Scannpattern, Zeitregime und Auflösung mit einer entsprechenden Synchronisierung von Strahlablenkung und Lasermodulation. Auf Grundlage der daraus resultierenden Erkenntnisse über den Zusammenhang zwischen Scanner-/Systemparametern und Bildparametern werden Testbild-Bildverarbeitungsalgorithmus-Kombinationen entwickelt und diese, angeordnet in einer Sequenz, mit einem Kalibrierverfahren zu einem Testverfahren für MEMS-Scanner vervollständigt. Die Ergebnisse dieser Arbeit entstanden im Rahmen von industriell beauftragten F&E-Projekten und fließen in die andauernde Fortführung des Themas beim Auftraggeber ein.

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42

Sigrist, Norbert. "First-order design of mirror systems with no axial symmetry". Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284660.

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All-reflective imaging systems that are asymmetrical and eccentric have the advantage of providing more degrees of freedom to improve image quality. A disadvantage of these asymmetrical imaging systems is that they suffer from asymmetric mapping. This asymmetric mapping manifests itself mainly in the presence of keystone distortion and anamorphism. Due to the increase in degrees of freedom, the complexity of such systems escalates; thus, the designer is confronted with the difficult task of determining optimal starting points. This work addresses several first-order aspects of the design and characterisation of asymmetrical, all-reflective, aspherical, eccentric imaging systems. In contrast to the work of Stone and Forbes, which is based upon the theory of Hamiltonian optics and includes both the first- and second-order considerations, this work is based upon the theory of collineation. Because of the inherent simplicity of the collinear mapping, which is a projective transformation, we are able to present a simple but certainly not naive way of designing and characterising such asymmetrical all-reflective imaging systems. The simplicity of this proposition has the advantage that we can gain insights into asymmetrical mapping behaviour. Specifically, we apply the collinear mapping model on all-reflective asymmetrical imaging systems resulting in the description of how the mapping between conjugate planes may be described. First we will define keystone distortion and anamorphism. Then we will introduce and investigate the significance of the Cardinal points and planes, the Scheimpflug condition and the horizon planes and show how they are applied in the designing of imaging systems that are free of both keystone distortion and anamorphism. Having established a first-order layout of the optical system, we will then develop a process for converting the first-order layouts into imaging systems consisting of real aspheric surfaces.

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43

Dai, Shanshan. "Low power high resolution electronic driver for deformable mirror systems". Thesis, Boston University, 2012. https://hdl.handle.net/2144/21143.

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Thesis (M.Sc.Eng.) PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
This thesis presents an integrated driver for deformable mirror array based on the architecture proposed in Horenstein, et al's "Ultra-low power multiplexed electronic driver for high resolution deformable mirror systems." The integrated driver consists of numerous high voltage (HV) analog switches connecting the deformable mirror cells, on demand by low-voltage digital control signals, to the HV analog signal line, and a HV power amplifier used to drive the HV analog signal line. The reduction of power consumption is essential in both HV power amplifier and analog switch designs for utilization of deformable mirror systems in space-based applications. In addition to low power design, this work also focuses on the analysis and design of multi-stage amplifier capable to drive large load capacitor, and HV analog switch robust to analog signal noise during OFF state. The specific research contributions of this work include (1) A feed-forward stage in combination with a class B output stage is proposed in the HV multi-stage power amplifier structure to improve the large-signal performance when driving large capacitive load. (2) A low voltage level-shifter and a voltage clamp are added in conventional HV analog switch to reduce the interference from the noisy analog signal line.
2031-01-01

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44

Ellis, Edric Mark. "Low-cost bimorph adaptive mirrors". Thesis, Imperial College London, 1999. http://hdl.handle.net/10044/1/51479.

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This thesis describes the modeling and manufacture of bimorph mirrors as well as an example of their application. A general review of adaptive optics is provided, paying particular attention to those technologies which would allow adaptive optics to be employed in non-astronomical situations. The first stage of the theoretical analysis of the bimorph mirror involves developing a mechanical model of the laminated structure. This is carried out using standard thin plate laminate theory; this results in expressions for the overall sensitivity of a bimorph mirror. The mechanical model also leads to an equation describing the response of the surface of the mirror to a given applied voltage. An analytical solution is developed, and its implementation described. Using this analytical solution, the performance of a bimorph mirror under various operating conditions is analysed. Particular attention is paid to the case of correcting phase fluctuations that have a Kolmogorov spectrum. The process of manufacturing bimorph mirrors is described in some detail, and results of this procedure are presented. Results from various bimorph mirrors are analysed, and the comparisons with the theory are presented. A possible use of bimorph mirrors in laser scanner systems is described. A simple demonstration system is described, and results from its operation are presented. A detailed design for a laser printer using adaptive optics is presented, along with the associated deformable mirror requirements.

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45

Bigelow, Bruce Charles. "Deformable secondary mirrors for adaptive optics". Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243988.

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46

Rakich, Andrew. "Simple four-mirror anastigmatic systems with at least one infinite conjugate". Thesis, University of Canterbury. Physics and Astronomy, 2007. http://hdl.handle.net/10092/1463.

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This thesis describes an analytical approach to the optical design of four-mirror anastigmatic optical systems. In all cases investigated here the object is at infinity. In the introduction the field of reflecting, or "catoptric", optical system design is discussed and given some historical context. The concept of the "simplest possible reflecting anastigmat" is raised in connection with Plate Diagram analysis. It is shown that four-plate systems are in general the simplest possible anastigmats, and that four-plate systems comprised of four spherical mirrors are the last family of "simplest possible reflecting anastigmats" for which the complete solution set remains unknown. In chapter 2 third-order aberration coefficients in wavefront measure are derived in a form that is particularly suitable for Plate Diagram analysis. These coefficients are subsequently used to describe the Plate Diagram, and to detail the application of the Plate Diagram to the survey of all possible solutions for four-spherical-mirror anastigmats. The Plate Diagram technique is also generalized to investigate its use as an optical design tool. In the example given a generalized Plate Diagram approach is used to determine solutions for four-mirror anastigmats with a prescribed first-order layout and a minimum number of conicoids. In chapter 3 results are presented for the survey of four-spherical-mirror anastigmats in which all elements are required to be smaller than the primary mirror. Two novel families of four-spherical-mirror anastigmats are presented and these are shown to be the only examples of four-spherical-mirror systems that exist under the given constraints. Chapter 4 gives an example of the application of Plate Diagram analysis to the design of an anastigmatic system with a useful first-order layout and a minimum number of conicoid mirrors. It is shown that systems with useful first-order layouts and only one conicoid mirror can be obtained using this method. In chapter 5 results are presented of the survey of all remaining four-spherical-mirror anastigmatic systems: that is systems in which elements are allowed to exceed the diameter of the entrance pupil, which includes systems with concave and convex primary mirrors. A wide variety of solutions are presented and classified according to both the underlying geometry of the solutions and the first-order layouts. Of these systems only one has been reported in previously published literature. The results presented in this thesis complete the set of "four-plate" reflecting anastigmats, and it can now be said that all possible solutions for four-spherical-mirror anastigmatic systems have been determined.

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47

Vigil, Ricardo. "Hermite-Gaussian modes and mirror distortions in the free electron laser". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Jun%5FVigil.pdf.

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Thesis (M.S. in Physics)--Naval Postgraduate School, June 2006.
Thesis Advisor(s): William Colson, Robert Armstead. "June 2006." Includes bibliographical references (p. 85-86). Also available in print.

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48

Würz-Wessel, Alexander. "Free formed surface mirrors in computer vision systems". [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=96833895X.

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49

葉耀隆. "Design and Research on Micro Mirror Scanning System". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/81611775760850490682.

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碩士
國立彰化師範大學
機電工程學系
97
Abstract In recent years, the actuator of micro mirror of electrostatic actuation is one of the main products for the industrial application and mass production in the MEMS field. This device is requested to project light source accurately onto the high reflection mirror surface, with lower power consumption, wide operating frequency range and the mean failure life (MFT) is long enough and so on. On these demands, the lower power consumption feature is to save energy and reduce the heat which is produced from the electrical energy. It also has to reduce the thermal stress of structure and increase service life of the product. We use the micro scanning mirror of MEMS in this research. The circuit base on electrostatic principle has been designed to boost the voltage for the reflector that can drive the MEMS component to reach the resonance frequency. Thus, it can change the surface angle of the mirror. Moreover, it could produce the gray scale by adding an addition modulate light source of the laser. The application of micro electro-optical technology is highly integrated. We could understand more detail on the driving characteristic of the MEMS component as well as the electro-optical element and its control system. The XILINX’s IC chip has been used in the control system. The VHDL program had written for control the CPLD digital circuit so that it can produce the gray effect for the laser light and to drive the scanning mirror. Eventually, all modules are combined on a PCB board and some useful characteristics have been measured for the laser projector application. Keyword：MEMS,Micro Scanning Mirror,Boost Voltage, Electrostatic,Resonance Frequency,Laser.

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50

Chung, Pei-Ling y 鍾佩玲. "System Implementation of Electronic Cosmetic Mirror Using Image Processing". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/03800615802404548050.

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碩士
逢甲大學
通訊工程所
99
Many ladies use their mirror while making up, usually encounter a situation that make-up position of the show not big enough, so produce the inconvenience of make-up. In order to solve cosmetic mirror inconvenient, so this thesis discusses how to use LCD computer monitor and webcam to work out an electronic cosmetic mirror system that can enlarge the cosmetic portion automatically. We will handle these images that captured by webcam and display these enlarged images on the screen after making calculation by image processing. In whole calculation, in the face detection, it uses the rectangle features and AdaBoost algorithm to detect the facial region. Then, for eyes and mouth detection, add region of interest concept, and the search area will be defined in the facial region, using AdaBoost classifier to detect eyes and mouth in the facial region, and orientate the eye and mouth features by face tracking. Finally, we can calculate current position by Temporal Differencing, and to enlarge make-up position by Bi-linear Interpolation.

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