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Brookes, Matthew Jon. "A multi-modal approach to functional neuroimaging." Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/14056/.
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The work undertaken involves the use of functional magnetic resonance imaging (fMRI) and magnetoencephalography (MEG) as separate but complementary non-invasive functional brain imaging modalities. The aim in combining fMRI and MEG is centred around exploitation of the high temporal resolution available in MEG, and the high spatial resolution available in fMRI. However, whilst MEG represents a direct measure of neuronal activity, BOLD fMRI is an indirect measure and this makes the two modalities truly complementary. In both cases, the imaging signals measured are relatively poorly understood and so the fundamental question asked here is: How are the neuromagnetic effects detectable using MEG related to the metabolic effects reflected in the fMRI BOLD response? Initially, a novel technique is introduced for the detection and spatial localisation of neuromagnetic effects in MEG. This technique, based on a beamforming approach to the MEG inverse problem, is shown to yield accurate results both in simulation and using experimental data. The technique introduced is applied to MEG data from a simple experiment involving stimulation of the visual cortex. A number of heterogeneous neuromagnetic effects are shown to be detectable, and furthermore, these effects are shown to be spatially and temporally correlated with the fMRI BOLD response. The limitations to comparing only two measures of brain activity are discussed, and the use of arterial spin labelling (ASL) to make quantitative measurements of physiological parameters supplementing these two initial metrics is introduced. Finally, a novel technique for accurate quantification of arterial cerebral blood volume using ASL is described and shown to produce accurate results. A concluding chapter then speculates on how these aCBV measurements might be combined with those from MEG in order to better understand the fMRI BOLD response.
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Bergvall-Kåreborn, Birgitta. "A multi-modal approach to soft systems methodology /." Luleå : Luleå Univ. of Technology (Luleå tekniska univ.), 2002. http://epubl.luth.se/1402-1544/2002/41.
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Bergvall-Kåreborn, Birgitta. "A multi-modal approach to soft systems methodology." Doctoral thesis, Luleå tekniska universitet, Innovation och Design, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18130.
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The main aim of my research is to explore ways of enriching Soft Systems Methodology by developing intellectual tools that can help designers to conceptualise, create and evaluate different design alternatives. This directs the focus on the methodology’s modelling phase even though some ideas related to analysis also will be presented. In order to realize this objective the study proposes the following supplements. Firstly, a framework of 15 modalities (knowledge areas) is suggested as a supplement to existing analysis techniques, with the aim of helping the analyst identify important aspects that need to be understood in order to identify relevant issues for modelling. Secondly, a concept called qualifying function is proposed as an additional modelling tool for drawing out different perspectives of a particular problem situation, discussing desirable purposes for the design, and for exploring the underlying rationale behind a suggested transformation or a stated Weltanschauung. Thirdly, an expansion of the measures of performance used in SSM modelling, for evaluating conceptual models of possible design alternatives, is suggested. This expansion also builds on the modal framework. Based on both the theoretical and the practical work I have done I conclude that using the modalities as a general framework in analysis, modelling and evaluation, as well as using the concept qualifying function to tease out and clarify relevant transformations and underlying value systems has practical benefits and therefore can be said to enrich Soft Systems Methodology.Godkänd; 2002; 20060928 (evan)
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Mahoor, Mohammad Hossein. "A Multi-Modal Approach for Face Modeling and Recognition." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_dissertations/32.
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This dissertation describes a new methodology for multi-modal (2-D + 3-D) face modeling and recognition. There are advantages in using each modality for face recognition. For example, the problems of pose variation and illumination condition, which cannot be resolved easily by using the 2-D data, can be handled by using the 3-D data. However, texture, which is provided by 2-D data, is an important cue that cannot be ignored. Therefore, we use both the 2-D and 3-D modalities for face recognition and fuse the results of face recognition by each modality to boost the overall performance of the system. In this dissertation, we consider two different cases for multi-modal face modeling and recognition. In the first case, the 2-D and 3-D data are registered. In this case we develop a unified graph model called Attributed Relational Graph (ARG) for face modeling and recognition. Based on the ARG model, the 2-D and 3-D data are included in a single model. The developed ARG model consists of nodes, edges, and mutual relations. The nodes of the graph correspond to the landmark points that are extracted by an improved Active Shape Model (ASM) technique. In order to extract the facial landmarks robustly, we improve the Active Shape Model technique by using the color information. Then, at each node of the graph, we calculate the response of a set of log-Gabor filters applied to the facial image texture and shape information (depth values); these features are used to model the local structure of the face at each node of the graph. The edges of the graph are defined based on Delaunay triangulation and a set of mutual relations between the sides of the triangles are defined. The mutual relations boost the final performance of the system. The results of face matching using the 2-D and 3-D attributes and the mutual relations are fused at the score level. In the second case, the 2-D and 3-D data are not registered. This lack of registration could be due to different reasons such as time lapse between the data acquisitions. Therefore, the 2-D and 3-D modalities are modeled independently. For the 3-D modality, we developed a fully automated system for 3-D face modeling and recognition based on ridge images. The problem with shape matching approaches such as Iterative Closest Points (ICP) or Hausdorff distance is the computational complexity. We model the face by 3-D binary ridge images and use them for matching. In order to match the ridge points (either using the ICP or the Hausdorff distance), we extract three facial landmark points: namely, the two inner corners of the eyes and the tip of the nose, on the face surface using the Gaussian curvature. These three points are used for initial alignment of the constructed ridge images. As a result of using ridge points, which are just a fraction of the total points on the surface of the face, the computational complexity of the matching is reduced by two orders of magnitude. For the 2-D modality, we model the face using an Attributed Relational Graph. The results of the 2-D and 3-D matching are fused at the score level. There are various techniques to fuse the 2-D and 3-D modalities. In this dissertation, we fuse the matching results at the score level to enhance the overall performance of our face recognition system. We compare the Dempster-Shafer theory of evidence and the weighted sum rule for fusion. We evaluate the performance of the above techniques for multi-modal face recognition on various databases such as Gavab range database, FRGC (Face Recognition Grand Challenge) V2.0, and the University of Miami face database.
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Langley, Dawn. "An explosive force : A multi-level, multi-modal approach to organisational learning." Thesis, University of Surrey, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527014.
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Knight, Dawn. "A multi-modal corpus approach to the analysis of backchanneling behaviour." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10786/.
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Current methodologies in corpus linguistics have revolutionised the way we look at language. They allow us to make objective observations about written and spoken language in use. However, most corpora are limited in scope because they are unable to capture language and communication beyond the word. This is problematic given that interaction is in fact multi-modal, as meaning is constructed through the interplay of text, gesture and prosody; a combination of verbal and non-verbal characteristics. This thesis outlines, then utilises, a multi-modal approach to corpus linguistics, and examines how such can be used to facilitate our explorations of backchanneling phenomena in conversation, such as gestural and verbal signals of active listenership. Backchannels have been seen as being highly conventionalised, they differ considerably in form, function, interlocutor and location (in context and co-text). Therefore their relevance at any given time in a given conversation is highly conditional. The thesis provides an in-depth investigation of the use of, and the relationship between, spoken and non-verbal forms of this behaviour, focusing on a particular sub-set of gestural forms: head nods. This investigation is undertaken by analysing the patterned use of specific forms and functions of backchannels within and across sentence boundaries, as evidenced in a five-hour sub-corpus of dyadic multi-modal conversational episodes, taken from the Nottingham Multi-Modal Corpus (NMMC). The results from this investigation reveal 22 key findings regarding the collaborative and cooperative nature of backchannels, which function to both support and extend what is already known about such behaviours. Using these findings, the thesis presents an adapted pragmatic-functional linguistic coding matrix for the classification and examination of backchanneling phenomena. This fuses the different, dynamic properties of spoken and non-verbal forms of this behaviour into a single, integrated conceptual model, in order to provide the foundations, a theoretical point-of-entry, for future research of this nature.
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Zhou, Shi Huang. "Operational modal decomposition approach for MDOF structures using multi-channel response measurements." Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3950681.
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Tjondronegoro, Dian W., and mikewood@deakin edu au. "Content-based video indexing for sports applications using integrated multi-modal approach." Deakin University. School of Information Technology, 2005. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20051110.122059.
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This thesis presents a research work based on an integrated multi-modal approach for sports video indexing and retrieval. By combining specific features extractable from multiple (audio-visual) modalities, generic structure and specific events can be detected and classified. During browsing and retrieval, users will benefit from the integration of high-level semantic and some descriptive mid-level features such as whistle and close-up view of player(s). The main objective is to contribute to the three major components of sports video indexing systems. The first component is a set of powerful techniques to extract audio-visual features and semantic contents automatically. The main purposes are to reduce manual annotations and to summarize the lengthy contents into a compact, meaningful and more enjoyable presentation. The second component is an expressive and flexible indexing technique that supports gradual index construction. Indexing scheme is essential to determine the methods by which users can access a video database. The third and last component is a query language that can generate dynamic video summaries for smart browsing and support user-oriented retrievals.
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Zaverucha, Gerson. "A nonmonotonic multi-agent logic of belief : a Modal Defeasible Relevant approach." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46629.
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Suthana, Nanthia Ananda. "Investigating human medical temporal representations of episodic information a multi-modal approach /." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1905692921&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
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Tabacaru, Sabina. "Humorous implications and meanings : a multi-modal approach to sarcasm in interactional humor." Thesis, Lille 3, 2014. http://www.theses.fr/2014LIL30015.
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Cette thèse examine les différentes façons utilisées pour construire de l’humour en interaction dans deux séries américaines contemporaines—/Dr. House/ et /The Big Bang Theory/. A travers les différentes techniques d’écriture, nous observons les éléments utilisés pour construire des énoncés humoristiques. Le dialogue entre les personnages occupe une place fondamentale puisqu’il est centré sur les points de convergence et donc sur l’idée d’intersubjectivité entre les interlocuteurs.Cette étude est basée sur une expérience originale qui implique l’examen de la gestuelle utilisée par les personnages dans les deux séries pour créer des effets humoristiques. Les gestes et les différentes techniques humoristiques ont été annotés dans le logiciel vidéo ELAN qui permet une vision plus large sur les processus créant l’humour en interaction.Les résultats montrent une visible préférence pour le sarcasme en tant que catégorie de l’humour la plus utilisée dans le corpus. De plus, le corpus montre aussi une prédilection pour l’utilisation de certaines expressions du visage (haussement et froncement des sourcils) ainsi que certains mouvements de la tête (inclinaison et hochement). Ces éléments sont repris et expliqués en fonction de leur rôle dans le contexte et dans l’attitude des locuteurs pour une meilleure compréhension de l’humour en interactionThis dissertation examines the different techniques used to achieve humor in interaction in two contemporary American television-series—/House M.D./ and /The Big Bang Theory./ Through different writing techniques, we observe the elements that are used in the process of humorous meaning construction. The dialogue between interlocutors plays a central role since it centers on intersubjectivity, and hence, the common ground between speakers.This original study also implies the investigation of the different gestures used by interlocutors in the two series to create humorous effects. These /gestural triggers/ as well as the different humor types have been annotated in ELAN, which allows a more holistic view of the processes involved in humor.The results show an evident preference for sarcasm as well as a preference for certain facial expressions (raising eyebrows and frowning) and head movements (head tilts and head nods). These elements are explained in accordance with a given context and with the speakers’ attitude for a better understanding of humor in interaction
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Beuriat, Pierre-Aurélien. "Mapping the anatomo-functional organization of human sensorimotor system : a multi-modal approach." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1246/document.
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Le but de cette thèse était d'étudier l'organisation anatomo-fonctionnelle du système sensorimoteur humain et la façon dont les mouvements volontaires sont produits et contrôlés. Avec le développement de l’imagerie cérébrale, des méthodes de corrélation anatomo-clinique et de stimulation électrique directe cérébrale, de nombreuses avancées scientifiques ont pu être réalisée. Ces trois approches complémentaires ont été utilisé dans cette thèse afin d’améliorer la compréhension de l’organisation sensorimotrice cérébrale. Dans la première étude (soumise à publication), nous avons montré que la chirurgie cérébrale éveillée utilisant la stimulation électrique directe est une procédure sûre et efficace chez les enfants afin de réduire le déficit neurologique postopératoire. L'approche améliore la précision de la détection des zones éloquentes, avec une bonne tolérance neuropsychologique et psychologique. Une évaluation psychologique et neuropsychologique est essentielle. Dans une deuxième série de deux études, nous avons montré que la partie dorso-postérieure dorsal du cortex pariétal (DPPr) est une structure clé dans l'organisation complexe du mouvement manuel fin chez l'homme à travers la mise en oeuvre d'une boucle sensori-parieto-motrice.La première étude (publiée, Current Biology 2018) montre que la stimulation électrique directe d’une region corticale focale dans la partie dorso-postérieure du cortex pariétal entraine l’inhibition de la production du mouvement manuel, c’est-à-dire bloque l'initiation et la réalisation de ce dernier, sans produire de contraction musculaire ni de sensation consciente de mouvement. Dans la seconde étude (en cours de soumission), nous avions pour objectif d'identifier précisément les bases anatomiques du circuit parietal inhibiteur précédemment décrit. Grâce à la tractographie de diffusion (DTI), nous avons réussi à isoler des projections ipsilatérales spécifiques reliant les sites d’inhibition du DPPr, retrouvés dans la première étude, avec la zones dévolues au contrôle distal fin dans les cortex primaires moteur (M1) et sensoriel (S1). Ces données montrent que la boucle pariétale inhibitrice est directe depuis S1 vers DPPr vers M1 (même s'il n'est pas possible d'exclure l'existence d'échanges bidirectionnels entre ces aires). Dans la dernière étude (en cours de soumission), nous nous sommes intéressé à une structure motrice fondamentale, qui supporte 50 % des invasions tumorales chez l'enfant : le cervelet. Il s'agissait de déterminer si les lésions précoces étaient oui ou non prédictives d'une récupération déficitaire à long terme après prise en compte des covariables les plus critiques. Nous avons mesuré la récupération fonctionnelle à long terme chez 3 groupes survivants de lésion de la fosse postérieure. Les 3 groupes étaient comparables en ce qui concerne leurs caractéristiques tumorales mais opérés à différents âges : jeune (≤ 7 ans), moyen (> 7 ans et ≤ 13 ans) et tardif (> 13 ans). La qualité de vie (échelles cliniques : Health-related Quality of Life -hrQol- et Performance Status -PS-), les performances motrices (ataxie -ICARS- et motricité fine -Pegboard-) et cognitif (quotient intellectuel -FSIQ-) furent mesurés. L'âge précoce lors de la chirurgie, une lésion des noyaux profonds cérébelleux et la nécessité d'une radiothérapie postopératoire révélèrent une influence significativement négative et indépendante sur la récupération à long terme des participants. Ces résultats confirment l'existence d'une période critique de développement au cours de laquelle la "machine à apprendre" cérébelleuse revêt une importance crucialeThe aim of the thesis was to investigate the mapping of the anatomofunctional organization of the human sensorimotor system and how volutional movements of human are produced and controlled. Neuroimaging and especially DTI, fine anatomo-functional observation in patient and direct electrical stimulation were considered. This multi-modal approach permitted to improve our understanding of sensorimotor organization in humans. In the first study, we showed that awake brain surgery with the use of direct electrical stimulation is a safe and efficient procedure in children in order to decrease post-operative neurological deficit. It improves the accuracy of detecting eloquent area, with a good tolerance from a neuropsychological and psychological aspect. Age-adapted neuropsychologic preparation may enable offering ABS even to younger children on an individual basis. In a second series of two studies, we showed that the dorso-posterior part of the parietal cortex is a key structure in the complex organization of movement in human with a S1-DPPr-M1 loop. In the first study, direct electrical stimulation of focal cortical site in the dorso-posterior part of the parietal cortex triggered inhibition of movement production and blocked ongoing movement without producing muscle contraction or conscious movement sensation. In the second study, we aimed to find a direct projection from the PRR, defined in the first study (Desmurget et al., 2018), to the primary motor cortex and the primary somatosensory cortex. Thanks to the DTI state-of-the-art tractography, we succeeded in finding such major ipsilateral streamlines projecting in the well-known hand knob region giving new insights of the white matter structures involved in the inhibition of volitional hand movements. These observations confirm clinical per-operative data showing that stimulating the counterpart of PRR in humans can disrupt hand movements ipsilaterally, irrespective of the hemisphere. Moreover, our results shed light on the implication of the PRR for the volitional hand sensorimotor operating behavior. In the last study, we investigate the impact of early cerebellar damage on long-term functional recovery in 3 groups of posterior fossa survivors, comparable with respect to their tumoural characteristics but operated at different ages: young (≤ 7 years), middle (> 7 years and ≤ 13 years) and old (> 13 years). Daily (Health-related Quality of Life -hrQol-, Performance Status -PS-), motor (International Cooperative Ataxia Rating Scale -ICARS-, Pegboard Purdue Test -PegBoard-) and cognitive (Full Scale Intelligence Quotient -FSIQ-) functioning were measured. Early age at surgery, lesion of deep cerebellar nuclei and post-operative radiotherapy had a significant, independent negative influence on long term recovery. These results support the existence of an early critical period of development during which the cerebellar "learning machine" is of critical importance
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Tjondronegoro, Dian W. "PhD Thesis: "Content-based Video Indexing for Sports Applications using Multi-modal approach"." Thesis, Deakin University, 2005. https://eprints.qut.edu.au/2199/1/PhDThesis_Tjondronegoro.pdf.
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Triggered by technology innovations, there has been a huge increase in the utilization of video, as one of the most preferred types of media due to its content richness, for many significant applications. To sustain an ongoing rapid growth of video information, there is an emerging demand for a sophisticated content-based video indexing system. However, current video indexing solutions are still immature and lack of any standard. One solution, namely annotation-based indexing, allows video retrieval using textual annotations. However, the major limitations are the restrictions of pre-defined keywords that can be used and the expensive manual work on annotating video. Another solution called feature-based indexing allows video search by low-level features comparison such as query by a sample image. Even though this approach can use automatically extracted features, users would not be able to retrieve video intuitively, based on high-level concepts. This predicament is caused by the so-called semantic gap which highlights the fact that users recall video contents in a high-level abstraction while video is generally stored as an arbitrary sequence of audio-visual tracks.
To bridge the semantic gap, this thesis will demonstrate the use of domain-specific approach which aims to utilize domain knowledge in facilitating the extraction of high-level concepts directly from the audiovisual features. The main idea behind domain-specific approach is the use of domain knowledge to guide the integration of features from multi-modal tracks. For example, to extract goal segments from soccer and basketball video, slow motion replay scenes (visual) and excitement (audio) should be detected as they are played during most goal segments. Domain-specific indexing also exploits specific browsing and querying methods which are driven by specific users/applications’ requirements. Sports video is selected as the primary domain due to its content richness and popularity. Moreover, broadcasted sports videos generally span for hours with many redundant activities and the key segments could make up only 30% to 60% of the entire data depending on the progress of the match.
This thesis presents a research work based on an integrated multi-modal approach for sports video indexing and retrieval. By combining specific features extractable from multiple (audio-visual) modalities, generic structure and specific events can be detected and classified. During browsing and retrieval, users will benefit from the integration of high-level semantic and some descriptive mid-level features such as whistle and close-up view of player(s). The main objective is to contribute to the three major components of sports video indexing systems. The first component is a set of powerful techniques to extract audio-visual features and semantic contents automatically. The main purposes are to reduce manual annotations and to summarize the lengthy contents into a compact, meaningful and more enjoyable presentation. The second component is an expressive and flexible indexing technique that supports gradual index construction. Indexing scheme is essential to determine the methods by which users can access a video database. The third and last component is a query language that can generate dynamic video summaries for smart browsing and support user-oriented retrievals.
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Tran, Tien Dung. "An approach to activity recognition using multiple sensors." Thesis, Curtin University, 2006. http://hdl.handle.net/20.500.11937/1702.
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Building smart home environments which automatically or semi-automatically assist and comfort occupants is an important topic in the pervasive computing field, especially with the coming of cheap, easy-to-install sensors. This has given rise to the indispensable need for human activity recognition from ubiquitous sensors whose purpose is to observe and understand what occupants are trying to do from sensory data. The main approach to the problem of human activity recognition is a probabilistic one so as to handle the complication of uncertainty, the overlapping of human behaviours and environmental noise. This thesis develops a probabilistic model as a framework for human activity recognition using multiple multi-modal sensors in complex pervasive environments. The probabilistic model to be developed is adapted and based on the abstract hidden Markov model (AHMM) with one layer to fuse multiple sensors. The concept of factored state representation is employed in the model to parsimoniously represent the state transitions for reducing the number of required parameters. The exact method is used in learning the model’s parameters and performing inference. To be able to incorporate a large number of sensors, several more parsimonious representations including the mixtures of smaller multinomials and sigmoid functions are investigated to model the state transitions, resulting in a reduction of the number of parameters and time required for training.We examine the approximate variational method to significantly reduce the time required for training the model instead of using the exact method. A system of fixed point equations is derived to iteratively update the free variational parameters. We also present the factored model in the case where all variables are continuous with the use of the conditional Gaussian distribution to model state transitions. The variational method is still employed in this case to speed up the model’s training process. The developed model is implemented and applied in recognizing daily activity in our smart home and the Nokia lab from multiple sensors. The experimental results show that the model is appropriate for fusing multiple sensors in activity recognition with a reasonable recognition performance.
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Tran, Tien Dung. "An approach to activity recognition using multiple sensors." Curtin University of Technology, School of Computing, 2006. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=17568.
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Building smart home environments which automatically or semi-automatically assist and comfort occupants is an important topic in the pervasive computing field, especially with the coming of cheap, easy-to-install sensors. This has given rise to the indispensable need for human activity recognition from ubiquitous sensors whose purpose is to observe and understand what occupants are trying to do from sensory data. The main approach to the problem of human activity recognition is a probabilistic one so as to handle the complication of uncertainty, the overlapping of human behaviours and environmental noise. This thesis develops a probabilistic model as a framework for human activity recognition using multiple multi-modal sensors in complex pervasive environments. The probabilistic model to be developed is adapted and based on the abstract hidden Markov model (AHMM) with one layer to fuse multiple sensors. The concept of factored state representation is employed in the model to parsimoniously represent the state transitions for reducing the number of required parameters. The exact method is used in learning the model’s parameters and performing inference. To be able to incorporate a large number of sensors, several more parsimonious representations including the mixtures of smaller multinomials and sigmoid functions are investigated to model the state transitions, resulting in a reduction of the number of parameters and time required for training.We examine the approximate variational method to significantly reduce the time required for training the model instead of using the exact method. A system of fixed point equations is derived to iteratively update the free variational parameters. We also present the factored model in the case where all variables are continuous with the use of the conditional Gaussian distribution to model state transitions. The variational method is still employed in this case to speed up the model’s training process. The developed model is implemented and applied in recognizing daily activity in our smart home and the Nokia lab from multiple sensors. The experimental results show that the model is appropriate for fusing multiple sensors in activity recognition with a reasonable recognition performance.
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Mashalaba, Eugenia Dudu. "The evaluation of a multi-modal cognitive-behavioural approach to treating an adolescent with conduct disorder." Thesis, Rhodes University, 2005. http://eprints.ru.ac.za/180/1/mashalaba-ma.pdf.
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Conduct Disorder (CD) is a repetitive and persistent pattern of behaviour in which the basic rights of others or major age-appropriate societal norms or rules are violated. It is one of the most common problems in South African schools, particularly in those that are poverty-stricken. The child who participated in the study lived in the shelter that was for homeless and disadvantaged children. He attended at Amasango School where the majority of children in the shelter attended. There were many conduct-disordered children in the shelter and the school, particularly in the school. They disrupted classes making in difficult for teachers to carry out their education activities. The aim of this study was to draw on the standard procedures of the CBT in order to design interventions that would be effective in reducing aggressive behaviour in an adolescent who had CD Adolescent-Type and who lived at the shelter. This case study evaluated the effectiveness of a multi-modal CBT programme in a 16 year-old Black male who had been displaying aggressive behaviour for about a year. The treatment consisted of 23 sessions and included teacher counseling, contingency management, self-control and self-instructional training. The treatment was evaluated qualitatively by means of interviews with the child and teacher and quantitatively by means of repeated applications of behaviour checklists completed by the teacher. The results showed a decrease in the client's aggressive behaviour and an increase in prosocial behaviour. The client ultimately ceased from all aggressive behaviour towards his peers and this outcome was sustained during his last two months in therapy.
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Washington, Lauren. "A multi-modal therapeutic approach to helping adolescent twins cope with age-level stress and sickle cell anemia." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1986. http://digitalcommons.auctr.edu/dissertations/1202.
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This study attempts to present a detailed case study investigation on adolescent twins with sickle cell anemia. The study attempts to answer -five basic research'questions: 1) What kinds o-f physiological stressors are evident in the medical records o-f the subjects involved? 2) Are there any incidences o-f stress in the psychological pro-files o-f the subjects involved? 3) Do the subjects show any indications o-f stress in the classroom setting? 4) Are there any indications o-f stress in the social pro-files o-f the subjects for study? Is this typical -for their age group? 5) Will a stress reduction program be a useful modality to enhance biopsychosocial functioning and reduce stress?
The major findings of the study are as follows: 1) The analysis of medical data reveals that one twin had more hospitalizations and medical complications than the other twin. Both twins feel that the sickle cell pain crisis is the most stressful event in their lives. 2) The analysis of psychological data reveals that both youngsters are experiencing varying degrees of stress. 3) Some indi cations of anxiety are shown in the classroom setting. 4) The social profile on each subject reveals that both twins are below average on scales measuring social interaction. 5) The multimodal stress reduction approach seems to be a useful modality to educate youth about ways to enhance biopsychosocial functioning.
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Asadipour, Ali. "A technology-aided multi-modal training approach to assist abdominal palpation training and its assessment in medical education." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/77668/.
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Kinaesthetic Learning Activities (KLA) are techniques for enhancing the motor learning process to provide a deep understanding of fundamental skills in particular disciplines. With KLA learning takes place by carrying out a physical activity to transform empirical achievements into representative cognitive understanding. In disciplines such as medical education, frequent hands-on practice of certain motor skills plays a key role in the development of medical students' competency. Therefore it is essential that clinicians master these core skills early on in their educational journey as well as retain them for the entirety of their career. Transferring knowledge of performing dexterous motor skills, such as clinical examinations, from experts to novices demands a systematic approach to quantify relevant motor variables with the help of medical experts in order to form a reference best practice model for target skills. Additional information (augmented feedback) on certain aspects of movements could be extracted from this model and visualised via multi-modal sensory channels in order to enhance motor performance and learning processes. This thesis proposes a novel KLA methodology to significantly improve the quality of palpation training in medical students. In particular, it investigates whether it is possible to enhance the existing abdominal palpation skills acquisition process (motor performance and learning) with provision of instructional concurrent and terminal augmented feedback on applied forces by the learner's hand via an autonomous multimodal displays. This is achieved by considering the following: identifying key motor variables with help of medical experts; forming a gold standard model for target skills by collecting pre-defined motor variables with an innovative quantification technique; designing an assessment criteria by analysing the medical experts' data; and systematically evaluating the impact of instructional augmented feedback on medical students' motor performance with two distinct assessment approaches(a machine-based and a human-based). In addition, an evaluation of performance on a simpler task is carried out using a game-based training method, to compare feedback visualisation techniques, such as concurrent visual and auditory feedback as used in a serious games environment, with abstract visualisation of motor variables. A detailed between-participants study is presented to evaluate the effect of concurrent augmented feedback on participants' skills acquisition in the motor learning process. Significant improvement on medical students' motor performance was observed when augmented feedback on applied forces were visually presented (H(2) = 6:033, p < :05). Moreover, a positive correlation was reported between computer-generated scores and human-generated scores, r = :62, p (one-tailed) < :05. This indicates the potential of the computer-based assessment technique to assist the current assessment process in medical education. The same results were also achieved in a blind-folded (no-feedback) transfer test to evaluate performance and short-term retention of skills in the game-based training approach. The accuracy in the exerted target force for participants in the game-playing group, who were trained using the game approach (Mdn = 0:86), differed significantly from the participants in control group, who trained using the abstract visualisation of the exerted force value (Mdn = 1:56), U = 61, z = -2:137, p < :05, r = -0:36. Finally, the usability of both motor learning approaches were surveyed via feedback questionnaires and positive responses were achieved from users. The research presented shows that concurrent augmented feedback significantly improves the participants' motor control abilities. Furthermore, advanced visualisation techniques such as multi-modal displays increases the participants' motivation to engage in learning and to retain motor skills.
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St, John Regina L. "An analysis of the self-evaluation strategy of reading one's drafts aloud as an aid to revision : a multi-modal approach." Virtual Press, 2004. http://liblink.bsu.edu/uhtbin/catkey/1301631.
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This mixed model study informed by a multi-modal approach investigated the relationship between reading aloud and the student revision process. Participants for this study were undergraduate juniors and seniors enrolled in any one of four sections of English 393 (Writing Competency Course) at Ball State University during the summer semester of 2003. These students had previously failed the Writing Competency Exam at Ball State; therefore, they had to complete English 393 successfully to fulfill Ball State's writing competency requirement and, ultimately, to graduate. Specifically, this study examined what types of surface and global features that these English 393 students noticed when reading their initial essay drafts aloud to themselves and what global revisions they made, if any, based upon these initial observations. Methods used were audio recordings, observation logs, multiple copies of student drafts, pre- and postattitudinal surveys, read-aloud surveys, post-revision surveys, introductory and concluding instructor surveys, additional instructor surveys, and reviews of composition/rhetoric textbooks.Results of this study indicated that students enrolled in English 393 courses at Ball State University during the summer of 2003 predominantly noticed surface features in their essays as a result of reading their initial drafts aloud to themselves. Therefore, using this read-aloud method did not prompt the large majority of these junior- and senior-level English 393 students to make global revisions in their drafts. They predominantly made surface-level revisions, indicative of the types of revisions that freshman college writers make. While one student from the population did make global revisions as a result of using the read-aloud method, the researcher attributed this anomaly to the student's probable oral learning style and/or the student's previous experience using the read-aloud method.Department of English
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Xiong, Xingyu. "Development of vibration-based multi-resonance energy harvesters using piezoelectric materials." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/development-of-vibrationbased-multiresonance-energy-harvesters-using-piezoelectric-materials(62d0d760-8b9c-4958-94a9-677b0e57082d).html.
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The development of self-powered wireless sensor networks for structural and machinery health monitoring has attracted considerable attention in the research field during the last decade. Since the low-duty-cycle wireless sensor networks have significantly reduced the power requirements to the range of tens to hundreds of microwatts, it is possible to harvest environmental energy as the power supply instead of using batteries. Vibration energy harvesting using piezoelectric materials has become the most popular technique, which has a good potential to generate adequate power. However, there is a limitation for the conventional beam-shaped harvester designs in real applications due to their limited bandwidth. In order to overcome this limitation, the essential objective of this thesis is to develop harvesters with multi-resonance structures. The multi-resonance harvester with good broadband performance can achieve close resonance frequencies and relatively large power output in each vibration mode. The main tasks and contributions of this thesis are summarised as follows: • A parametric analysis is presented to determine how the modal structural and electromechanical performances of cantilevered beam harvesters are affected by two modal factors designated as mass ratio and electromechanical coupling coefficient (EMCC). The modal performance of using rectangular, convergent and divergent tapered configurations with and without extra masses are systematically analysed by geometric variation using the finite element analysis (FEA) software ABAQUS. • A modal approach using the two modal factors to evaluate the modal performance of harvesters is introduced and a configurational optimization strategy based on the modal approach is developed to pre-select the configurations of multi-resonance harvesters with better modal structural performance and close resonance frequencies in multiple modes. Using this optimization strategy obviates the need to run the full analysis at the first stage. • A novel two-layer stacked harvester, which consists of a base cantilevered beam that is connected to an upper beam by a rigid mass, is developed. By altering the dimensions and the locations of the masses, the two-layer harvester can generate two close resonance frequencies with relatively large power output. The effects of using rectangular, convergent and divergent tapered beam configurations are systematically analysed. • Multi-layer stacked harvesters with up to five layers are developed. The three-layer harvesters with different mass positions, which can generate three close resonance frequencies, are optimized using the configurational optimization strategy. • A novel doubly-clamped multi-layer harvester, which is able to generate five close resonance frequencies with relatively large power output, is developed and thoroughly analysed. • An experimental study of the multi-layer stacked harvester is presented to validate the simulated results and the configurational optimization strategy. • An experimental study of the two-layer stacked harvester using high performance single crystal piezoelectric material PIMNT is presented. The harvester using PIMNT can generate nearly 10 times larger power output and 3.5 times wider bandwidth than using PZT. Besides, by modifying the location of the piezoelectric layer, anti-resonances between two adjacent modes can be eliminated.
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Casey, Bradley Vincent. "Optimising container processes at multimodal seaport terminals : an integrated approach and application." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/49787/1/Brad_Casey_Thesis.pdf.
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A Multimodal Seaport Container Terminal (MSCT) is a complex system which requires careful planning and control in order to operate efficiently. It consists of a number of subsystems that require optimisation of the operations within them, as well as synchronisation of machines and containers between the various subsystems. Inefficiency in the terminal can delay ships from their scheduled timetables, as well as cause delays in delivering containers to their inland destinations, both of which can be very costly to their operators. The purpose of this PhD thesis is to use Operations Research methodologies to optimise and synchronise these subsystems as an integrated application. An initial model is developed for the overall MSCT; however, due to a large number of assumptions that had to be made, as well as other issues, it is found to be too inaccurate and infeasible for practical use. Instead, a method of developing models for each subsystem is proposed that then be integrated with each other. Mathematical models are developed for the Storage Area System (SAS) and Intra-terminal Transportation System (ITTS). The SAS deals with the movement and assignment of containers to stacks within the storage area, both when they arrive and when they are rehandled to retrieve containers below them. The ITTS deals with scheduling the movement of containers and machines between the storage areas and other sections of the terminal, such as the berth and road/rail terminals. Various constructive heuristics are explored and compared for these models to produce good initial solutions for large-sized problems, which are otherwise impractical to compute by exact methods. These initial solutions are further improved through the use of an innovative hyper-heuristic algorithm that integrates the SAS and ITTS solutions together and optimises them through meta-heuristic techniques. The method by which the two models can interact with each other as an integrated system will be discussed, as well as how this method can be extended to the other subsystems of the MSCT.
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Murner, Cory James. "Main street evolved: envisioning a comprehensive approach to main street redevelopment in small mountain communities." Kansas State University, 2011. http://hdl.handle.net/2097/8563.
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Master of Landscape ArchitectureDepartment of Landscape Architecture/Regional and Community Planning
Blake M. Belanger
The main streets of the Rocky Mountain West are the social, economic, and cultural centers of their respective communities. Often, these main streets may deteriorate or become abandoned as a result of edge shopping malls and strip style economic development. Thus, a downtown or main street redevelopment effort by the community can help to ensure these economic centers remain. Yet, too often, the redevelopment efforts are oversimplified and fail to integrate the most current street development principles and design initiatives that can benefit not only the community but also the surrounding environment. I n the modern American city, almost half of all daily trips are less than three miles and a third are under one mile. (McCann 2010) “These are distances easily traversed by foot or bicycle, yet 65 percent of trips under one mile are made by automobile.” (McCann 2010) This mobility trend has led to the foundation of programs and organizations that try to promote non-motorized travel. Although these initiatives respond to the human/physical environment, they are far from comprehensive. Today, an integration of smart ecological ideals is essential. How can the revitalization efforts of Rocky Mountain communities be guided to ensure they consider not only the built environment; but also the natural environment? The face of the future main street will be multi-modal and ecologically responsible. Yet, there is presently no clear method of combining the two. A union of the multi-modal principles behind Complete Streets and the ecologically responsible ideals green infrastructure can provide a framework for a new and more inclusive redevelopment approach. The merging of modern ecological and street design principles can lead to a comprehensive Main Street redevelopment program and therefore successfully guide the revitalization efforts of small Rocky Mountain communities in a way that is responsive to future development needs as well as the cultural and ecological aspects of the region. Main Street Evolved will provide a set of tools to guide Colorado Rocky Mountain Main Street redevelopment efforts by providing strategies and implementation guidelines that focus on balancing multi-modal ideals and ecological stormwater management techniques within a small-town mountain context.
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Nelson, Craig William Phillip. "'Enhanced' public participation and the involvement of the general public of Salisbury in the South West Area Multi Modal Study : an assessment of Labour's 'modernised' approach to 'better' decision-making." Thesis, University of Aberdeen, 2005. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU204686.
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When Labour took power in 1997, it all but abandoned the large scale road building plans of the previous Conservative administration and undertook a policy of 'integrated' transport which focused more on public transport as a solution to congestion. However, a number of roads projects survived, pending further review by a series of Multi Modal Studies (MMS). For the first time, a transport study would not be modal-specific. Around the same time, and following a particularly poor turnout at the ballot box, Labour began steps to 'modernise' democracy in the UK and encourage people to become more politically 'involved' through what became known as 'enhanced' participation methods. The Government believed that more public involvement would mean 'better' decisions were made. This thesis examines one of the MMS, the South West Area Multi Modal Study, which took place between April 2000 and May 2003. The central aim of the thesis is to assess the influence and success of 'enhanced' participation in encouraging the general public to become 'involved' in the study process. The study employs predominately quantitative methods of data collection and analysis, including the use of a questionnaire distributed to random addresses. The main findings are that, despite consultants employing 'enhanced' methods of participation, the majority of respondents were unaware of the study taking place. Because of this lack of interest, any decisions made based on the submissions of the public would have been significantly unrepresentative and in no means 'better'. The thesis also uncovered a degree of participation potential amongst respondents and a number of barriers that may encourage more of the general public to participate in the future. If these barriers are addressed 'enhanced' participation would appear to be a workable and useful tool in the Government's quest for a 'modernised social democracy' and 'better' decision making.
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Li, Changhong [Verfasser], Björn M. [Akademischer Betreuer] Kampa, Frank [Akademischer Betreuer] Müller, and David [Akademischer Betreuer] Elmenhorst. "Impact of sleep on the A1 adenosine receptor, neuronal activity, and structural connectivity of the human brain : a multi-modal neuroimaging approach / Changhong Li ; Björn M. Kampa, Frank Müller, David Elmenhorst." Aachen : Universitätsbibliothek der RWTH Aachen, 2021. http://d-nb.info/1240390882/34.
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Vinayak, Harsh. "Multi-body Dynamics and Modal Analysis Approaches for Multi-mesh Transmissions with Compliant Gear Bodies." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392059093.
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Crowley, Michael J. "Subtyping boys with conduct problems categorical and dimensional approaches with mulit-modal [i.e. multi-modal] assessment of psychophysiology and behavior /." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/2062.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.Thesis research directed by: Psychology. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Diagne, Ibrahima. "Dynamic Analysis and Control of Multi-machine Power System with Microgrids: A Koopman Mode Analysis Approach." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/84546.
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Electric power systems are undergoing significant changes with the deployment of large-scale wind and solar plants connected to the transmission system and small-scale Distributed Energy Resources (DERs) and microgrids connected to the distribution system, making the latter an active system. A microgrid is a small-scale power system that interconnects renewable and non-renewable generating units such as solar photo-voltaic panels and micro-turbines, storage devices such as batteries and fly wheels, and loads. Typically, it is connected to the distribution feeders via power electronic converters with fast control responses within the micro-seconds. These new developments have prompted growing research activities in stability analysis and control of the transmission and the distribution systems. Unfortunately, these systems are treated as separated entities, limiting the scope of the applicability of the proposed methods to real systems. It is worth stressing that the transmission and distribution systems are interconnected via HV/MV transformers and therefore, are interacting dynamically in a complex way. In this research work, we overcome this problem by investigating the dynamics of the transmission and distribution systems with parallel microgrids as an integrated system . Specifically, we develop a generic model of a microgrid that consists of a DC voltage source connected to an inverter with real and reactive power control and voltage control. We analyze the small-signal stability of the two-area four-machine system with four parallel microgrids connected to the distribution feeders though different impedances. We show that the conventional PQ control of the inverters is insufficient to stabilize the voltage at the point-of-common coupling when the feeder impedances have highly unequal values. To ensure the existence of a stable equilibrium point associated with a sufficient stability margin of the system, we propose a new voltage control implemented as an additional feedback control loop of the conventional inner and outer current control schemes of the inverter. Furthermore, we carry out a modal analysis of the four-machine system with microgrids using Koopman mode analysis. We reveal the existence of local modes of oscillation of a microgrid against the rest of the system and between parallel microgrids at frequencies that range between 0.1 and 3 Hz. When the control of the microgrid becomes unstable, the frequencies of the oscillation are about 20 Hz. Recall that the Koopman mode analysis is a new technique developed in fluid dynamics and recently introduced in power systems by Suzuki and Mezic. It allows us to carry out small signal and transient stability analysis by processing only measurements, without resorting to any model and without assuming any linearization.Ph. D.
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Lingenfelser, Florian [Verfasser], and Elisabeth [Akademischer Betreuer] André. "From Synchronous to Asynchronous Event-driven Fusion Approaches in Multi-modal Affect Recognition / Florian Lingenfelser ; Betreuer: Elisabeth André." Augsburg : Universität Augsburg, 2018. http://d-nb.info/1168591031/34.
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Dalvi, Rupin. "Novel approaches for multi-modal imaging and fusion in orthopaedic research for analysis of bone and joint anatomy and motion." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/15857.
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Faced with an increasingly aging and overweight population, our modern societies, particularly in the west, are set to witness a steep rise in various orthopaedic health problems in the coming decades, especially joint diseases such as arthritis. Better understanding of the way bones of the joints work is thus imperative for studying the nature and effects of these diseases and for finding cures. The data obtained from conventional sources such as skin markers and x-ray/fluoroscopy scans are generally useful but quite limited in terms of accuracy, quantification abilities and three-dimensional visualization potential. The continuous increase in the quality and versatility of various modern imaging modalities is enabling many new means for enhanced visualization and analysis of motion data of the joints. In this thesis we make use of ultrasound (US) and magnetic resonance (MR) imaging to facilitate robust, accurate and efficient analysis of the bones of joints in motion. We achieve this by obtaining motion data using 3D US with high temporal resolution which is then fused with a high spatial resolution, but static MRI volume of the same region (we mostly focus on the knee joint area). Our contributions include novel ways for improved segmentation and localization of the bones from image data. In particular, a highly effective method for improving bone segmentation in MRI volumes by enhancing the contrast at the bone-cartilage interface is proposed. Our contribution also focuses on robust and accurate registration of image data. To achieve this, a new method for stitching US bone volumes is proposed for generating larger fields of view. Further, we also present a novel method for US-MRI bone surface registration. The tools developed during the course of this thesis facilitate orthopaedic research efforts aiming to improving our understanding of the workings of the joints. The tools and methodologies proposed are versatile and expected to be applicable to other applications.
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Leturc, Christopher. "Raisonner sur la manipulation dans les systèmes multi-agents : une approche fondée sur les logiques modales." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC236.
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Ces dernières décennies, le développement informatique est passé de la conception de logiciels individuels, à la conception de logiciels intelligents, autonomes, appelés agents et interagissant avec d'autres en formant des systèmes multi-agents. Dans de tels systèmes, il arrive que des agents malintentionnés mettent en œuvre des stratégies complexes pour inciter d'autres agents à prendre des décisions en leur faveur et ce, sans que ces derniers ne s'en aperçoivent. Nous parlons alors de stratégies de manipulation. Ces stratégies peuvent dans certains cas causer des problèmes aux agents qui en sont victimes. De telles stratégies sont toujours dissimulées aux agents et donc difficiles à détecter. Comment les détecter et mieux les combattre ? Dans un premier temps, il est nécessaire de définir la manipulation. Ainsi, sur la base de travaux issus de l'informatique mais aussi des sciences sociales, nous définissons la manipulation comme l'intention délibérée d'un agent d'instrumentaliser une victime tout en veillant à lui dissimuler cette intention. Pour répondre à cette problématique, nous proposons un système logique nommé KBE. Ce système, prouvé correct et complet, permet alors d'exprimer et de raisonner sur la manipulation ainsi que sur des stratégies fondées sur les connaissances et les croyances des agents comme le mensonge ou le baratinage. Ce système nous permet également d'exprimer des notions connexes à la manipulation comme la coercition et la persuasion. Dans un second temps, puisque la confiance est un mécanisme permettant de réguler les interactions entre agents lorsque des agents sont malintentionnés ou non fiables, nous proposons un second système logique nommé TB. Ce système, correct et complet, exprime une notion de confiance en la sincérité qui représente le choix d'un agent de prendre le risque de croire un autre agent vis-à-vis de sa sincérité. Enfin, dans un dernier temps, nous proposons une méthode algorithmique pour raisonner avec de tels systèmes. Cette méthode est adaptée au système TB et décide de son problème de satisfiabilité en utilisant directement les contraintes du cadre pour construire un modèleIn recent decades, computer development has shifted from designing individual software to designing intelligent, self-contained software called agents and interacting with others to form multi-agent systems. In such systems, malicious agents sometimes implement complex strategies to induce other agents to make decisions in their favor, without the latter noticing them. We are talking about manipulation strategies. These strategies may in some cases cause problems for the agents which are victims. Such strategies are always hidden from agents and therefore hard to detect. How detect them and better fight them? Firstly, it is necessary to define manipulation. Thus, based on work from computer sciences and social sciences, we define manipulation as the deliberate intention of an agent to instrumentalize a victim while making sure to conceal that intent. We propose to answer this question, a logical system named KBE which expresses manipulation. We prove that KBE is correct and complete, and is able to express strategies based on knowledge and beliefs of agents, like lying or bullshiting. This system can also express notions such as coercion and persuasion. Secondly, since trust is a mechanism to regulate the interactions between agents when agents may be malicious or unreliable, we propose another logical system named TB. This system, proved to be correct and complete, expresses a notion of trust in sincerity which represents the choice of an agent to take the risk of believing another agent for its sincerity. Finally, we propose an algorithmic method to reason with such systems. This method is adapted to the TB system and decides on its satisfiability problem by directly using the constraints of the framework to build a model
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Chebbi, Houssem. "Méthode des coordonnées curvilignes pour la modélisation électromagnétique des matériaux complexes : application au contrôle non destructif par courants de Foucault des matériaux composites The fast computation of eddy current distribution and probe response in homogenized composite material based on semi-analytical approach Investigation of layer interface model of multi-layer structure using semi-analytical and FEM analysis for eddy current pulsed thermography." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST004.
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Ce travail de thèse de doctorat, effectué au sein de Laboratoire de Simulation et Modélisation Électromagnétique (LSME) du CEA List, s’intègre dans le cadre du projet européen « NDTonAir » financé sous l'action « H2020-MSCA-ITN-2016- GRANT 722134 ». Le principal objectif est le développement d’un outil de simulation rapide et précis dédié au contrôle non destructif par courants de Foucault des matériaux composites homogénéisés. Comme cas d’application, on s’intéresse particulièrement à l’orientation des fibres d’une part, et d’autre part, à des défauts de type délaminage et ondulation des fibres qui se manifestent par une déformation géométrique locale des interfaces. Les méthodes semi-analytiques existantes dans la littérature, basées sur le formalisme des Dyades de Green, sont limitées jusqu’au là à des structures planes multicouches. Pour introduire des variations locales de géométrie aux interfaces, nous proposons une approche innovante basée sur un changement de coordonnées adapté au profil de la pièce et des interfaces. On propose un modèle numérique performant basé sur le formalisme covariant des équations de Maxwell. Ce formalisme unificateur englobe l'anisotropie du spécimen et les déformations locales des interfaces. La méthode de coordonnées curvilignes est usuellement utilisée pour résoudre des problèmes de diffraction sur des surfaces rugueuses dans le domaine des hautes fréquences (diffraction sur des réseaux). Ce travail de thèse s’inspire des méthodes de Fourier modale et propose de nouveaux outils adaptés au domaine des courants de Foucault. L’extension de la méthode des coordonnées curvilignes au domaine du contrôle des composites par courants de Foucault constitue l’innovation de ce travail. Deux modèles numériques ont été développés pour le calcul de l’interaction du champ émis par un capteur à courants de Foucault avec un matériau composite multicouches. Le modèle numérique développé pour le contrôle des composites plans exploite les structures particulières des matrices creuses pour réduire le temps de calcul sans limitation de nombre de modes utilisés pour la représentation du champ. Dans le cas des profils curvilignes des interfaces, le modèle permet de traiter des interfaces parallèles et quelques cas particuliers des profils non parallèles. Ce cas général présente quelques limitations qui nécessitent le développement des outils numériques complémentaires. Enfin, plusieurs configurations de contrôle ont été envisagées et les résultats numériques produits par les modèles ont été confrontés à des données de simulation par éléments finis. Quelques expérimentations ont été effectuées dans des laboratoires partenaires étrangers pour accroître notre expérience sur la validation expérimentaleThis doctoral thesis work, carried out within the Laboratory of Simulation and Modeling for Electromagnetics (LSME) of CEA List, is part of the “NDTonAir” European project funded under the action “H2020-MSCA-ITN -2016- GRANT 722134”. The main goal of the project is the development of a fast and accurate simulation tool for the non-destructive eddy current testing of homogenized composite materials. As an application case, we are particularly interested in the orientation of the fibers on the one hand, and on the other hand, in defects as delamination which are manifested by a local geometrical deformation of the interfaces. The semi-analytical methods existing in the literature, based on Green's Dyad formalism, have been limited so far to multilayered and planar structures. To introduce local variations in geometry at the interfaces, we propose an innovative approach based on a change of coordinates adapted to the profile of the local perturbation. We propose a powerful numerical model based on the covariant formalism of Maxwell's equations. This unifying formalism takes in the anisotropy of specimen and the local deformations of the interfaces. The curvilinear coordinate method is usually used to solve diffraction problems on rough interfaces in the high frequency domain (diffraction on gratings). This thesis work is inspired by Fourier Modal Methods and proposes new tools which have been adapted to the field of eddy currents. The extension of the curvilinear coordinate method to the field of eddy currents non-destructive testing technique of composites constitutes the innovation of this work. Two numerical models have been developed to calculate the interaction of the field emitted by an eddy current probe with a multilayered composite material. The numerical model developed for the evaluation of planar composite exploits the particular structures of sparse matrices to reduce the computation time without limiting the number of modes used for the modal expansion of the field. In the case of the curvilinear profiles of the interfaces, the model makes it possible to treat parallel interfaces and some particular cases of non-parallel profiles. The general case of non-identical profiles presents some limitations which require the development of complementary numerical tools. Finally, several testing configurations were considered and the numerical results produced by the models were compared to finite element simulated data. Some experiments were carried out in foreign partner laboratories to increase our experience on experimental validation
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Oliveira, Daniel Barbosa de. "A multi-modal approach for affective data gathering." Master's thesis, 2019. http://hdl.handle.net/10773/29400.
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Recognizing, interpreting and processing emotions (Affective Computing) is an emerging field of computer science. Multiple methods of data acquisition and emotion classification exist with different accuracy performances. Despite this, multimodal systems, generally have a higher accuracy than unimodal ones.
This dissertation’s goal is to research the current methods of both affective data gathering and emotion classification while developing a multi-modal system, that focuses primarily on the utilisation of non-intrusive methods with potential application in cccupational stress.
The system has the purpose of collecting affective data including multiple data gathering methods such as mouse and keyboard utilisation data, ECG data, face and upper body video recordings and computer screen video recordings (for activity detection). For the emotion classification, the Clustering and Random Forest algorithms were utilised.
In the exploratory study with the already existent SWELL investigation dataset, we tested the algorithm of Random Forest and an overall accuracy of 89.97% was achieved, which we considered acceptable. In order to validate the final system, a study with eleven participants was conducted. An overall error rate of approximately 65% was achieved with the Random Forest algorithm. For the majority of the participants, the Clustering algorithm did not recognize most of the data above 3% in class 2. The participants also reported in the questionnaires an overall decrease in the stress felt. Therefore, it is possible that the proposed protocol did not induce the desired emotional state (stress) in the participants.
The developed multimodal system is functional and can be utilised in other studies with emotional markings gathering.O reconhecimento, a interpretação e o processamento de emoções (Affective Computing) é uma área emergente das aplicações computacionais. Existem vários métodos de aquisição de dados e de classificação de emoções, com precisões distintas, em que os sistemas multimodais apresentam geralmente uma precisão mais elevada do que os unimodais. Nesta dissertação, procuramos investigar os métodos atualmente usados para recolher informação afetiva bem como métodos para a análise da mesma, tendo em vista uma proposta de um sistema multimodal, com foco em métodos não-intrusivos, com potencial aplicação na monitorização de stress ocupacional. O sistema desenvolvido tem como objectivo a recolha de informação afetiva, incluindo várias fontes de dados, como informação sobre utilização do rato e do teclado, dados ECG, vídeo da face e gravações de vídeo do ecrã do computador (para deteção de atividades). Para a classificação de emoções, foram utilizados os algoritmos de Clustering e de Random Forest. Num estudo exploratório, usando o dataset de investigação SWELL, testámos o algoritmo de Random Forest e obtivemos uma precisão global de 89.97% na classificação, o que considerámos satisfatória, uma vez que é comparável com os resultados apresentados na literatura. O sistema desenvolvido foi testado num conjunto de onze participantes. Globalmente, o algoritmo de Random Forest obteve uma taxa de erro de 65%. O algoritmo de Clustering testado não classificou acima de 3% dos dados na classe 2. Quando se avaliaram os questionários de avaliação do estado emocional (aplicados antes e depois do teste ao sistema), verificou-se que os participantes reportaram um decremento na ansiedade sentida depois da realização do estudo. O que pode indicar que o protocolo de recolha de dados apresentado pode não ter induzido os estados emocionais pretendidos (stress) nos participantes O sistema multimodal encontra-se funcional e pode ser aplicado em outros estudos para recolha de marcadores de emoções.
Mestrado em Engenharia de Computadores e Telemática
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Kumari, K., J. P. Singh, Y. K. Dwivedi, and Nripendra P. Rana. "Towards Cyberbullying-free social media in smart cities: a unified multi-modal approach." 2019. http://hdl.handle.net/10454/18116.
Full textAbstract:
YesSmart cities are shifting the presence of people from physical world to cyber world (cyberspace). Along with the facilities for societies, the troubles of physical world, such as bullying, aggression and hate speech, are also taking their presence emphatically in cyberspace. This paper aims to dig the posts of social media to identify the bullying comments containing text as well as image. In this paper, we have proposed a unified representation of text and image together to eliminate the need for separate learning modules for image and text. A single-layer Convolutional Neural Network model is used with a unified representation. The major findings of this research are that the text represented as image is a better model to encode the information. We also found that single-layer Convolutional Neural Network is giving better results with two-dimensional representation. In the current scenario, we have used three layers of text and three layers of a colour image to represent the input that gives a recall of 74% of the bullying class with one layer of Convolutional Neural Network.
Ministry of Electronics and Information Technology (MeitY), Government of India
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(10875660), Hamed Asadi. "Multi-Modal Sensing Approach for Objective Assessment of Musculoskeletal Fatigue in Complex Work." Thesis, 2021.
Find full textAbstract:
Surface electromyography (sEMG) has been used to monitor muscle activity and predict fatigue in the workplaces. However, objectively measuring fatigue is challenging in complex work with unpredictable work cycles, where sEMG may be influenced by the dynamically changing posture demands. The sEMG is affected by various variables and substantial change in mean power frequencies (MPF), and a decline over 8-9% is primarily considered musculoskeletal fatigue. These MPF thresholds have been frequently used, and there were limited efforts to test their appropriateness in determining musculoskeletal fatigue in live workplaces (which predominantly consist of complex tasks). In addition, the techniques that consider both muscular and postural measurements that incorporate dynamic posture changes observed in complex work have not yet been explored. The overall objective of this work is to leverage both postural and muscular cues to identify musculoskeletal fatigue in complex tasks/jobs (i.e., tasks involving different levels of exertions, durations, and postures). The work was completed in two studies.
The first study aimed to (1) predict subjective fatigue using objective measurements in non-repetitive tasks, (2) determine whether the musculoskeletal fatigue thresholds in non-repetitive tasks differed from the previously reported threshold, and (3) utilize the empirically calculated thresholds to test their appropriateness in determining musculoskeletal fatigue in live surgical workplaces. The findings showed that the multi-modal measurements indicate better sensitivity than single-modality (sEMG) measurements in detecting decreases in MPF, a predictor of fatigue. In addition, the results showed that the thresholds in dynamic non-repetitive tasks, like surgery, are different than the previously reported 8% threshold. Additionally, implementing muscle-specific thresholds increased the likelihood of more accurately reporting subjective fatigue. The second study aimed to develop a multi-modal fatigue index to detect musculoskeletal fatigue. A controlled laboratory study was performed to simulate the non-repetitive physical demands at different postures. A series of experiments were conducted to test the effectiveness of various metrics/models to identify subjective fatigue in complex tasks. Next, the composite fatigue index (CFI) function was developed using the time-synced integration of both muscular signals (measured with sEMG sensors) and postural signals (measured with Inertial Measurement Unit (IMU) sensors). The variables from sEMG (amplitude, frequency, and the number of muscles showing signs of fatigue) and IMU (the prevalence of static and demanding postures and the number of shoulders in static/demanding posture) sensors were integrated to generate the CFI function. The prevalence of static/demanding postures was developed using the cumulative exposures to static/demanding postures based on the material fatigue failure theory. The single value fatigue index was obtained using the resultant CFI function, which incorporates both muscular and postural variables, to quantify the muscular fatigue in dynamic non-repetitive tasks. The findings suggested that the propagation of musculoskeletal fatigue can be detected using the multi-modal composite fatigue index in complex tasks. The resultant CFI function was then applied to surgery tasks to differentiate the fatigued and non-fatigued groups. The findings showed that the multi-modal fatigue assessment techniques could be utilized to incorporate the muscular and postural measurements to identify fatigue in complex tasks beyond single-modality assessment approaches.
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Mashalaba, Eugenia Dudu. "The evaluation of a multi-modal cognitive-behavioural approach to treating an adolescent with conduct disorder /." 2004. http://eprints.ru.ac.za/180/.
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Hogan, Mary-Ellen. "Reducing Pain in Four- to Six-month Old Infants Undergoing Immunization using a Multi-modal Approach." Thesis, 2011. http://hdl.handle.net/1807/29558.
Full textAbstract:
Background: Infant immunization pain is not currently well managed despite effective strategies.
Objective: To determine the effectiveness of tactile stimulation when added to a combination of pain-reducing interventions in infants undergoing immunization.
Methods: Healthy infants aged 4-6 months undergoing immunization in primary care were randomized to tactile stimulation or usual care. All infants also received pain-relieving interventions. A validated measure of acute pain in infants, the Modified Behavioral Pain Scale (MBPS), was the primary outcome.
Results: Altogether, 120 infants participated. Characteristics did not differ (p > 0.05) between those allocated to tactile stimulation and usual care groups. Mean MBPS pain scores did not differ between groups: 8.2 (1.1) vs. 8.0 (1.3); p = 0.57, respectively.
Conclusions: Parent-led tactile stimulation did not improve pain relief in infants when added to other interventions. Parental attention could have been focused on tactile stimulation, preventing parents from performing appropriate soothing activities. Additional investigation of the effectiveness of clinician-led tactile stimulation is recommended.
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"Representing and Reasoning about Dynamic Multi-Agent Domains: An Action Language Approach." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.49093.
Full textAbstract:
abstract: Reasoning about actions forms the basis of many tasks such as prediction, planning, and diagnosis in a dynamic domain. Within the reasoning about actions community, a broad class of languages, called action languages, has been developed together with a methodology for their use in representing and reasoning about dynamic domains. With a few notable exceptions, the focus of these efforts has largely centered around single-agent systems. Agents rarely operate in a vacuum however, and almost in parallel, substantial work has been done within the dynamic epistemic logic community towards understanding how the actions of an agent may effect not just his own knowledge and/or beliefs, but those of his fellow agents as well. What is less understood by both communities is how to represent and reason about both the direct and indirect effects of both ontic and epistemic actions within a multi-agent setting. This dissertation presents ongoing research towards a framework for representing and reasoning about dynamic multi-agent domains involving both classes of actions.
The contributions of this work are as follows: the formulation of a precise mathematical model of a dynamic multi-agent domain based on the notion of a transition diagram; the development of the multi-agent action languages mA+ and mAL based upon this model, as well as preliminary investigations of their properties and implementations via logic programming under the answer set semantics; precise formulations of the temporal projection, and planning problems within a multi-agent context; and an investigation of the application of the proposed approach to the representation of, and reasoning about, scenarios involving the modalities of knowledge and belief.Dissertation/Thesis
Doctoral Dissertation Computer Science 2018
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Cochrane, Melanie. "Exploring the heart and mind of anxiety: a multi-modal approach to examining the neurovisceral integration model in clinically anxious adults." Thesis, 2018. https://dspace.library.uvic.ca//handle/1828/9766.
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Objective: The purpose of this dissertation was to reproduce Thayer and Lane’s (2000) neurovisceral model by examining both tonic and phasic heart rate variability (HRV) and emotion regulation (ER), and explore the effects of brief evidence-based intervention techniques in a sample of adults with clinically elevated levels of anxiety. Methods: This was a comprehensive multi-methodological study of 34 adults (ages 19 to 63 years) with clinically elevated levels of anxiety. Study 1 examined subjective and physiological effects of implementing ER strategies in response to a well-validated emotion elicitation paradigm consisting of viewing emotion-eliciting aversive images and sentences. Study 2 employed a within-subject RCT design and compared the impact of cognitive restructuring (CR), a top-down ER technique, with open monitoring mindfulness (OM), a bottom-up ER technique. Effects of intervention on self-regulation were assessed at a physiological (i.e. HRV), behavioral (i.e. ER and executive function (EF) computerized task) and subjective (i.e. self-report questionnaires) level. Results: Study 1 revealed that tonic HRV significantly predicted perceived ER success for both top-down and bottom-up generated emotions, whereas phasic HRV only predicted perceived ER success under conditions of bottom-up emotion generation. Variability emerged in our findings depending on the unique ER strategy used. Study 2 indicated a significant time by intervention effect on phasic HRV on the ER task, where HRV decreased with CR and increased with OM. There was a main effect of age independent of intervention on the EF task, such that increased age was related to increased phasic reactivity. On the ER task, CR led to greater perceived success in cognitive reappraisal. On the EF task, CR became faster, whereas OM became slower but more accurate. Significant intervention effects were also found on self-reported anxiety and aspects of mindfulness, with greatest reductions in anxiety found in OM compared to CR. Conclusions: In keeping with the neurovisceral integration model, HRV was reduced in individuals’ with clinically elevated levels of anxiety. Moreover, our findings illustrate that the method of emotion generation and regulation matters and has a significant impact on the degree to which persons with clinical levels of anxiety are able to successfully self-regulate. Finally, our results demonstrate the utility of multi-modal assessment of cognitive and emotional dysregulation in anxiety disorders, as well as the different pathways through which different interventions can impact HRV and ameliorate symptoms of anxiety.Graduate
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(13285545), Catherine Leitenberger. "Attention Deficit Hyperactivity Disorder (ADHD): Developing a vision for effective service delivery." Thesis, 1996. https://figshare.com/articles/thesis/Attention_Deficit_Hyperactivity_Disorder_ADHD_Developing_a_vision_for_effective_service_delivery/20545518.
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In this study, the controversies surrounding the diagnosis and management of children with Attention Deficit Hyperactivity Disorder (ADHD) are discussed. The influence of the historical background on the current debate is considered, along with the way that the information about this disorder is accessed, communicated and interpreted by parents and service providers. The experiences of parents whose children have been diagnosed with ADHD are examined in order to understand their needs in terms of service delivery options. The experiences of service providers are also examined to determine the nature of support that is provided. Outcomes of current service provision options are discussed, along with suggestions for improvements in service delivery. The difficulties that parents have had in accessing support and the problems that service providers report highlight the need for an approach to service delivery that fosters cooperative partnerships between parents and service providers. Finally, a vision which incorporates the suggestions from parents and service providers and thc findings from current researchers is proposed.