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Yao, Xu. „Latent representations for facial images and video editing“. Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAT019.
Der volle Inhalt der QuelleLearning to edit facial images and videos is one of the most popular tasks in both academia and industrial research. This thesis addresses the problem of face editing for the special case of high-resolution images and videos.In this thesis, we develop deep learning-based methods to perform facial image editing. Specifically, we explore the task using the latent representations obtained from two types of deep neural networks: autoencoder-based models and generative adversarial networks. For each type of method, we consider a specific image editing problem and propose an effective solution that outperforms the state-of-the-art.The thesis contains two parts. In part I, we explore image editing tasks via the latent space of autoencoders. We first consider the style transfer task between photos and propose an effective algorithm that is built on a pair of autoencoder-based networks. Second, we study the face age editing task for high-resolution images, using an encoder-decoder architecture. The proposed network encodes a face image to age-invariant feature representations and learns a modulation vector corresponding to a target age. Our approach allows for fine-grained age editing on high-resolution images in a single unified model.In part II, we explore the editing task via the latent space of generative adversarial models (GANs). First, we consider the problem of facial attribute disentangled editing on synthetic and real images, by proposing a latent transformation network that acts in the latent space of a pre-trained GAN model. We also proposed a video manipulation pipeline, to generalize the editing result to videos. Second, we investigate the problem of GAN inversion -- the projection of a real image to the latent space of a pretrained GAN. In particular, we propose a feed-forward encoder, which encodes a given image to a feature code and a latent code in one pass. The proposed encoder is shown to be more accurate and stable for image and video inversion, meanwhile, maintaining good editing capacities
Prang, Mathieu. „Representation learning for symbolic music“. Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS489.
Der volle Inhalt der QuelleA key part in the recent success of deep language processing models lies in the ability to learn efficient word embeddings. These methods provide structured spaces of reduced dimensionality with interesting metric relationship properties. These, in turn, can be used as efficient input representations for handling more complex tasks. In this thesis, we focus on the task of learning embedding spaces for polyphonic music in the symbolic domain. To do so, we explore two different approaches.We introduce an embedding model based on a convolutional network with a novel type of self-modulated hierarchical attention, which is computed at each layer to obtain a hierarchical vision of musical information.Then, we propose another system based on VAEs, a type of auto-encoder that constrains the data distribution of the latent space to be close to a prior distribution. As polyphonic music information is very complex, the design of input representation is a crucial process. Hence, we introduce a novel representation of symbolic music data, which transforms a polyphonic score into a continuous signal.Finally, we show the potential of the resulting embedding spaces through the development of several creative applications used to enhance musical knowledge and expression, through tasks such as melodies modification or composer identification
Saund, Eric. „The Role of Knowledge in Visual Shape Representation“. Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/6833.
Der volle Inhalt der QuelleWanigasekara, Prashan. „Latent state space models for prediction“. Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106269.
Der volle Inhalt der QuelleCataloged from PDF version of thesis.
Includes bibliographical references (pages 95-98).
In this thesis, I explore a novel algorithm to model the joint behavior of multiple correlated signals. Our chosen example is the ECG (Electrocardiogram) and ABP (Arterial Blood Pressure) signals from patients in the ICU (Intensive Care Unit). I then use the generated models to predict blood pressure levels of ICU patients based on their historical ECG and ABP signals. The algorithm used is a variant of a Hidden Markov model. The new extension is termed as the Latent State Space Copula Model. In the novel Latent State Space Copula Modelthe ECG, ABP signals are considered to be correlated and are modeled using a bivariate Gaussian copula with Weibull marginals generated by a hidden state. We assume that there are hidden patient "states" that transition from one hidden state to another driving a joint ECG-ABP behavior. We estimate the parameters of the model using a novel Gibbs sampling approach. Using this model, we generate predictors that are the state probabilities at any given time step and use them to predict a patient's future health condition. The predictions made by the model are binary and detects whether the Mean arterial pressure(MAP) is going to be above or below a certain threshold at a future time step. Towards the end of the thesis I do a comparison between the new Latent State Space Copula Model and a state of the art Classical Discrete HMM. The Latent State Space Copula Model achieves an Area Under the ROC (AUROC) curve of .7917 for 5 states while the Classical Discrete HMM achieves an AUROC of .7609 for 5 states.
by Prashan Wanigasekara.
S.M. in Engineering and Management
Elguendouze, Sofiane. „Explainable Artificial Intelligence approaches for Image Captioning“. Electronic Thesis or Diss., Orléans, 2024. http://www.theses.fr/2024ORLE1003.
Der volle Inhalt der QuelleThe rapid advancement of image captioning models, driven by the integration of deep learning techniques that combine image and text modalities, has resulted in increasingly complex systems. However, these models often operate as black boxes, lacking the ability to provide transparent explanations for their decisions. This thesis addresses the explainability of image captioning systems based on Encoder-Attention-Decoder architectures, through four aspects. First, it explores the concept of the latent space, marking a departure from traditional approaches relying on the original representation space. Second, it introduces the notion of decisiveness, leading to the formulation of a new definition for the concept of component influence/decisiveness in the context of explainable image captioning, as well as a perturbation-based approach to capturing decisiveness. The third aspect aims to elucidate the factors influencing explanation quality, in particular the scope of explanation methods. Accordingly, latent-based variants of well-established explanation methods such as LRP and LIME have been developed, along with the introduction of a latent-centered evaluation approach called Latent Ablation. The fourth aspect of this work involves investigating what we call saliency and the representation of certain visual concepts, such as object quantity, at different levels of the captioning architecture
BIGGIO, MONICA. „Space in action: motor aspects of peripersonal space representation“. Doctoral thesis, Università degli studi di Genova, 2018. http://hdl.handle.net/11567/929746.
Der volle Inhalt der QuelleMohanadas, Rohin. „Discerning truck stop semantics through latent space clustering“. Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240598.
Der volle Inhalt der QuelleGPS-systemen för navigation har funnits i nästan tre årtionden och de kan numera även hittas i lokaliseringssystem. Scania har en flotta bestående av 300 000 uppkopplade fordon som skickar information om deras position till Scania. I den här masteruppsatsen används positionsinformationen från de Scaniafordon som klassificeras som stillastående. Denna klacificering bygger på rå positionsinformation som baserat på tid och rum inte får variera mer än vissa tröskelvärden och de beskriver därigenom platser där lastbilar har stannat. En oövervakad maskininlärningsmetod användes för att försöka förstå semantiken bakom dessa stillaståenden. Data från lastbilarna projiceras till ett lägre dimensionellt rum med hjälp av deep autoencoders och klustringen optimeras sedan fram i denna lägre dimension. Klustringen har i denna masteruppsats visat sig respresentativ för olika anledningar till stillastående lastbilar. Detta kan vara användbart för att förstå användarmönster men även förtransportsnavets användarstatistik.
Mathis, Alexander. „The representation of space in mammals“. Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-150029.
Der volle Inhalt der QuellePritchard, Annette. „Tourism representation, space and the power perspective“. Thesis, Manchester Metropolitan University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311204.
Der volle Inhalt der QuelleKelly, Michael C. „Efficient representation of adaptable virtual auditory space“. Thesis, University of York, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274510.
Der volle Inhalt der QuelleCarroll, Elizabeth. „The representation of space in musical numbers“. Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/374396/.
Der volle Inhalt der QuelleLaurí, Pla David. „MPC: Relevant Identification and Control in the Latent Variable Space“. Doctoral thesis, Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/15178.
Der volle Inhalt der QuelleLaurí Pla, D. (2012). MPC: Relevant Identification and Control in the Latent Variable Space [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/15178
Palancia
Ödling, David, und Arvid Österlund. „Factorisation of Latent Variables in Word Space Models : Studying redistribution of weight on latent variables“. Thesis, KTH, Skolan för teknikvetenskap (SCI), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153776.
Der volle Inhalt der QuelleMålet med alla semantiska fördelningsmodeller (DSMs) är en skalbaroch precis representation av semantiska relationer. Nya rön från Bullinaria & Levy (2012) och Caron (2001) indikerar att man kan förbättra prestandan avsevärt genom att omfördela vikten ifrån principalkomponenterna med störst varians mot de lägre. Varför metoden fungerar är dock fortfarande oklart, delvis på grund av höga beräkningskostnader för PCA men även på grund av att resultaten strider mot tidigare praxis. Vi börjar med att replikera resultaten i Bullinaria & Levy (2012) för att sedan fördjupa oss i resultaten, både kvantitativt och kvalitativt, genom att använda oss av BLESS testet. Huvudresultaten av denna studie är verifiering av 100% på TOEFL testet och ett nytt resultat på en paradigmatisk variant av BLESStestet på 91.5%. Våra resultat tyder på att en omfördelning av vikten ifrån de första principalkomponenterna leder till en förändring i fördelningensins emellan de semantiska relationerna vilket delvis förklarar förbättringen i TOEFL resultaten. Vidare finner vi i enlighet med tidigare resultat ingen signifikant relation mellan ordfrekvenser och viktomfördelning. Utifrån dessa resultat föreslår vi en rad experiment som kan ge vidare insikt till dessa intressanta resultat.
Barrett, Douglas J. K. „Attention and the representation of objects in space“. Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/843518/.
Der volle Inhalt der QuelleAktug, Irem. „State space representation for verification of open systems“. Licentiate thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3973.
Der volle Inhalt der QuelleO'Mara, Shane. „The representation of space in the primate hippocampus“. Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297241.
Der volle Inhalt der QuelleDelpratt, O'Neil Davion. „Space efficient in-memory representation of XML documents“. Thesis, University of Leicester, 2009. http://hdl.handle.net/2381/4805.
Der volle Inhalt der QuelleBRAGA, LUCIANA DE LACERDA DIAS. „SCHOLL SPACE AND TEACHING WORK: MEMORIES AND REPRESENTATION“. PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=25916@1.
Der volle Inhalt der QuelleCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO
PROGRAMA DE EXCELENCIA ACADEMICA
BOLSA NOTA 10
Esta tese é um estudo sobre memórias dos espaços escolares vividos por professores. Procura identificar as condições e dimensões do trabalho docente a partir do espaço escolar e memórias sobre a jornada educativa de dezessete professores de Ensino Superior e Ensino Médio de um município de Minas Gerais As memórias foram colhidas por meio de entrevista semiestruturada. Essas memórias de um tempo e espaço vividos pelos professores entrevistados formam uma narrativa do passado que se entrelaça no presente, criando significados na forma de sua atividade docente. Dessa forma, o fio condutor de todo o trabalho são as memórias do espaço escolar. Tanto o espaço, quanto o trabalho docente são construções sociais interdependentes, que são influenciadas pela trajetória de vida, cultura e formação do sujeito. As análises são fundamentadas em estudos sobre arquitetura/espaço (Bachelard, Viñao-Frago, Escolano), cultura visual (Hernández), espaço/relações de poder (Foucault), memória (Bergson, Bosi) e estudos sobe docentes (Tardiff, Raymond). O espaço escolar causa impactos objetivos e subjetivos em seus usuários. Nesse sentido, o espaço é produtor de identidades, símbolos e relações que exercem influencia no trabalho docente. Dessa forma, a partir das falas dos professores pode-se perceber que: embora as ideias e práticas pedagógicas sejam ligadas ao contexto político, social e tecnológico, esse último é o mais percebido e, quanto ao uso do espaço, o professor sente-se aprisionado por imposições superiores como decisões da direção escolar, exames nacionais e conteúdo da disciplina.
This thesis is a study of memories of school spaces experienced by teachers. The goal is to identify the conditions and dimensions of teachers work from the scholar environment and memories of the educational journey of seventeen teachers working in higher education and in high school in a city in Minas Gerais. The memories were collected through semi-structured interviews. These memories of a time and space experienced by the teachers interviewed form a narrative of the past that blends with the present time, creating meanings in his teaching activities. Thus, the common thread of this work are the memories of school space. Both the space, as the teaching are interdependent social constructs, which are influenced by the life, culture and formation of the subject. The analyzes are based on studies of architecture / space (Bachelard, Vinao-Frago, Escolano), visual culture (Hernández), space / power relations (Foucault), memory (Bergson, Bosi) and studies about teachers (Tardiff, Raymond). The school environment causes subjective and objective impacts on their inhabitants. In this sense, space produces identity, symbols and relationships which influence on teaching. Thus, from the teachers speeches can be seen that: although the ideas and teaching practices are linked to political, social and technological context, the latter is the most noticed and, for the use of space, the teacher feels trapped by higher decisions of the school board, national tests and content of the discipline.
Kim, Misun. „Three-dimensional space representation in the human brain“. Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10053145/.
Der volle Inhalt der QuelleVerriotis, M. A. „Exploring the brain's representation of three-dimensional space“. Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1339146/.
Der volle Inhalt der QuelleGutiérrez, Gómez Cristian Leonardo [UNESP]. „Minkowski space Bethe-Salpeter equation within Nakanishi representation“. Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/144735.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O trabalho apresentado nessa tese foi dedicado em explorar soluções de estado ligado para a equação de Bethe-Salpeter, obtidas diretamente no espaço de Minkowski. Para isso, consideramos um procedimento que combina a representação integral de Nakanishi para a amplitude Bethe-Salpeter, desenvolvido por N. Nakanishi na década de sessenta, em conjunto com a projeção da amplitude de Bethe-Salpeter no plano nulo, também conhecida como a projeção na frente de luz. Este método, além de permitir calcular as energias de ligação, que são acessíveis a partir de cálculos bem conhecidos no espaço Euclidiano, permite que se obtenha a amplitude Bethe-Salpeter no espaço de Minkowski e a função de onda de valência na frente de luz. A verificação da validade desse procedimento foi confirmada através de comparação da amplitude de Bethe-Salpeter obtida diretamente no espaço Euclidiano com a amplitude correspondente derivada da equação de Bethe-Salpeter, usando a representação integral de Nakanishi, uma vez a rotação de Wick é realizada. O sucesso dessa abordagem, quando aplicado ao problema do estado ligado de duas partículas escalares trocando uma outra partícula escalar no estado fundamental, assim como o estudo correspondente no limite de energia zero, nos motivou a ampliar a aplicação do procedimento para o estudo de outros problemas de interesse. Em particular, o método foi estendido para o estudo de sistemas com duas dimensões espaciais e uma temporal (2+1), considerando o interesse crescente que surgiu em Física da matéria condensada, onde podemos destacar o caso de elétrons de Dirac no grafeno. Nessa análise preliminar, nos restringimos ao modelo escalar que nos permitiu acessar as principais dificuldades que deverão ser enfrentadas ao estudar o problema do estado ligado entre dois férmions. Dessa forma, este tratamento pode ser considerado como um primeiro passo para a implementação de um método mais realístico em um problema fermiônico. Os cálculos anteriores que consideramos em nossos estudos foram realizados através da aproximação de escada para o kernel de interação irredutível para os estados de onda-s. Portanto, uma das extensões que exploramos nesta tese foi o efeito de se introduzir a contribuição de ordem seguinte no kernel de interação, conhecida como a contribuição de escada-cruzada (cross-ladder). Os efeitos nas energias de ligação e na função de onda na frente de luz é foram analisados de forma detalhada, através dos resultados apresentados. Um estudo particularmente interessante, que foi extensivamente estudado nesta tese, se refere ao problema do espectro da equação Bethe-Salpeter para o estado ligado escalar-escalar. O espectro de estados excitados foi obtido com a abordagem da representação integral Nakanishi, sendo comparado com o obtido no espaço Euclidiano. Além disso, as raçoes excitado/fundamental do espectro relativístico foram reduzidas para às não-relativístico através da escolha de energias de ligação pequenas e considerando a massa do bóson trocado sendo próxima de zero. A função de onda de valência na frente de luz e a função de onda no parâmetro de impacto são apresentadas mostrando as principais características dos estados excitados conhecidos da estrutura não relativística. Na análise do espectro, também são estudadas as amplitudes de momentum-transverso para o estado fundamental e o primeiro estado excitado, que podem ser obtidos, de forma equivalente, no espaço de Minkowski assim como no espaço Euclidiano. Finalmente, focamos o estudo nos fatores de forma eletromagnéticos elásticos na abordagem da Bethe-Salpeter. Consciente de que o cálculo correto dos fatores de forma deve ser feito no espaço de Minkowski, o fator de forma elástico foi calculado levando-se em consideração a aproximação de impulso padrão. Além disso, foi também estudado o efeito da contribuição de ordem superior no fator de forma.
The work presented in this thesis was dedicated in exploring bound-state solutions of the Bethe-Salpeter equation directly in the Minkowski space. For that, we consider a method that combines the Nakanishi integral representation for the Bethe-Salpeter amplitude, developed by Noboru Nakanishi in the sixties, together with the projection of the Bethe-Salpeter amplitude onto the null-plane, also known as the light-front projection. This approach, besides of allowing to compute the binding energies, which are accessible from the usual Euclidean calculation, enables to obtain the Bethe-Salpeter amplitude in the Minkowski space and the light-front wave function. The feasibility of such an approach is further verified by comparing the Bethe-Salpeter amplitude obtained directly in the Euclidean space with the corresponding amplitude obtained by solving the Bethe-Salpeter equation, using the Nakanishi integral representation, once the Wick rotation is performed to this latter. The success of the approach when applied to study the bound state problem of two-scalar particles exchanging another scalar particle in the ground state, as well as the corresponding study at the zero-energy limit, has encouraged us to extend this method to another interesting problems. In particular, we start by extending the method to study problems in (2+1) dimensions due to the increasing interest in the condensed-matter physics, like the study of Dirac electrons in graphene. In this initial examination we restrict to the scalar model, which enables us to access to the main difficulties that we will face when studying the fermion-fermion bound state problem. Hence, this calculation can be considered as the first step towards the implementation of the method to real fermionic problems. The previous calculations have been performed by considering the ladder approximation for the irreducible interacting kernel for s-wave states. Therefore, one of the extensions that is explored in this thesis is the effect of introducing the next contribution in the interacting kernel, known as the scalar-scalar cross-ladder contribution. The effects in the eigenvalues and the light-front wave functions are analyzed in detail, by considering the computed results. A particular interesting subject, extensively studied in this thesis, is concerned to the spectrum of the Bethe-Salpeter equation for the scalar-scalar bound-state problem. The spectrum of excited states obtained with the Nakanishi integral representation approach is compared with that obtained in the Euclidean calculation. Besides, the ratio energies excited/ground of the relativistic spectrum is reduced to the non-relativistic one by choosing small binding energies and the mass of the exchanged boson approaching to zero. The valence light-front wave function and the impact-parameter space valence wave function are displayed, revealing the main features of excited states known from the non-relativistic framework. In the analysis of the spectrum, we also studied the transverse-momentum amplitudes for the ground and first-excited state, which can be equivalently obtained in the Minkowski or Euclidean spaces. Finally, we focus on the study of electromagnetic elastic form factors within the Bethe-Salpeter approach. Aware that the correct calculation of form factors should be performed in the Minkowski space, the calculation of the elastic form factor is carried out with the standard impulse approximation and in addition the effect of the next contribution to the form factor is studied.
Gutiérrez, Gómez Cristian Leonardo. „Minkowski space Bethe-Salpeter equation within Nakanishi representation /“. São Paulo, 2016. http://hdl.handle.net/11449/144735.
Der volle Inhalt der QuelleCoorientador: Tobias Frederico
Banca: Vladimir Karmanov
Banca: Kazuo Tsushima
Banca: Alfredo Takashi Suzuki
Banca: Waynei Leonardo da Silva de Paula
Resumo: O trabalho apresentado nessa tese foi dedicado em explorar soluções de estado ligado para aequação de Bethe-Salpeter, obtidas diretamente no espaço de Minkowski. Para isso, consideramos um procedimento que combina a representação integral de Nakanishi para a amplitude Bethe-Salpeter, desenvolvido por N. Nakanishi na década de sessenta, em conjunto com a projeção da amplitude de Bethe-Salpeter no plano nulo, também conhecida como a projeção na frente de luz. Este método, além de permitir calcular as energias de ligação, que são acessíveis a partir de cálculos bem conhecidos no espaço Euclidiano, permite que se obtenha a amplitude Bethe-Salpeter no espaço de Minkowski e a função de onda de valência na frente de luz. A verificação da validade desse procedimento foi confirmada através de comparação da amplitude de Bethe-Salpeter obtida diretamente no espaço Euclidiano com a amplitude correspondente derivada da equação de Bethe-Salpeter, usando a representação integral de Nakanishi, uma vez a rotação de Wick é realizada. O sucesso dessa abordagem, quando aplicado ao problema do estado ligado de duas partículas escalares trocando uma outra partícula escalar no estado fundamental, assim como o estudo correspondente no limite de energia zero, nos motivou a ampliar a aplicação do procedimento para o estudo de outros problemas de interesse. Em particular, o método foi estendido para o estudo de sistemas com duas dimensões espaciais e uma temporal (2+1), considerando o interesse cresc... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The work presented in this thesis was dedicated in exploring bound-state solutions of the Bethe-Salpeter equation directly in the Minkowski space. For that, we consider a method that combines the Nakanishi integral representation for the Bethe-Salpeter amplitude, developed by Noboru Nakanishi in the sixties, together with the projection of the Bethe-Salpeter amplitude onto the null-plane, also known as the light-front projection. This approach, besides of allowing to compute the binding energies, which are accessible from the usual Euclidean calculation, enables to obtain the Bethe-Salpeter amplitude in the Minkowski space and the light-front wave function. The feasibility of such an approach is further verified by comparing the Bethe-Salpeter amplitude obtained directly in the Euclidean space with the corresponding amplitude obtained by solving the Bethe-Salpeter equation, using the Nakanishi integral representation, once the Wick rotation is performed to this latter. The success of the approach when applied to study the bound state problem of two-scalar particles exchanging another scalar particle in the ground state, as well as the corresponding study at the zero-energy limit, has encouraged us to extend this method to another interesting problems. In particular, we start by extending the method to study problems in (2+1) dimensions due to the increasing interest in the condensed-matter physics, like the study of Dirac electrons in graphene. In this initial examination we restrict to the scalar model, which enables us to access to the main difficulties that we will face when studying the fermion-fermion bound state problem. Hence, this calculation can be considered as the first step towards the implementation of the method to real fermionic problems. The previous calculations have been performed by considering the ladder approximation for the... (Complete abstract click electronic access below)
Doutor
Kuhnert, Sebastian. „Space efficient algorithms for graph isomorphism and representation“. Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17447.
Der volle Inhalt der QuelleThe graph isomorphism problem deals with the question if two graphs have the same structure up to renaming their vertices. It is one of the few remaining natural problems for which neither a polynomial-time algorithm nor NP-hardness is known. This situation has led to a branch of research that develops efficient algorithms for special cases of the graph isomorphism problem, where the input graphs are required to be from restricted graph classes. The main contribution of this thesis comprises of logspace algorithms that solve the isomorphism problem for k-trees, interval graphs, Helly circular-arc graphs and proper circular-arc graphs. This improves previously known parallel algorithms and leads to a complete classification of the complexity of these problems, as they are also shown to be hard for logspace. In fact, these algorithms achieve more: In the case of k-trees, the algorithm computes canonical labelings in space O(k log n). An alternative implementation runs in time O((k+1)!n), where n is the number of vertices, yielding the fastest known FPT algorithm for k-tree isomorphism. The algorithms for interval and circular-arc graphs actually compute canonical representations, i.e., each vertex is assigned an interval (or arc) such that these intersect each other if and only if the corresponding vertices are adjacent, and isomorphic input graphs receive the same interval (or arc) model. This thesis also presents logspace algorithms that compute interval representations with additional properties, or detect that this is not possible: The resulting interval models can be required to be proper (no interval contains another), unit (all intervals have the same length), or to satisfy prescribed lengths for pairwise intersections (and possibly prescribed lengths of intervals).
Yap, Kheng Kin. „PROJECT: SPANNING THE SPACE OF DISLOCATION“. Thesis, The University of Sydney, 2005. http://hdl.handle.net/2123/1336.
Der volle Inhalt der QuelleYap, Kheng Kin. „PROJECT: SPANNING THE SPACE OF DISLOCATION“. University of Sydney, 2005. http://hdl.handle.net/2123/1336.
Der volle Inhalt der QuelleStudio work The Postgraduate Degree Show is held from 6PthP December 2005 to 17PthP December 2005 and my work is installed in the Sculpture Studio (as a gallery space) at Building 29 of Sydney College of the Arts, Sydney. There are three installations of work, each with a series of paintings and object-models. The media I am using are oil on canvas for the paintings and wood for the models. The titles of my exhibition pieces are Project Studio (Stairs), Project Rented Room (Chair), Project Rented Room (Bed), and Project Object. Together they are entitled Project: Spanning the Space of Dislocation. The project explores the perception of space and its representation through painting and installation. The starting point is the image of familiar architectural objects to which I displace the experience of it from one site (my painting studio) to another (the gallery space) through painting as index. I use the technique of ambiguous linear forms in painting and the reflexive reading of orthogonal projective planes in installation to further extend the viewer’s perception of space and objects. The aim is to show that space has a meaningful relationship to objects and bring about a renewed awareness of habitual practice in seeing and representing space. UResearch paperU I have divided my research paper in two chapters. Chapter one explores the issue of spatial representation through ambiguity of simple linear forms and painting as index. My concern is on space being less important to objects in the distinction between space as ground and object as figure. Within this chapter I argue for an extended and a reflexive mode of seeing and representing space and objects instead of for a ground-figure contrast. By mapping my experience on a usual working site and displacing it to another space, I show that my perception of space is extended such that the boundary between the familiar and foreign (that is, space-object distinction) is blurred. Chapter two explores the method of presentation through painting and installation in a gallery and addresses the viewer’s space of perception with the work. I also discuss possible reflexive readings on the projective planes of the work which further extend the perception of it.
Akgün, Yenal Eyüce Özen. „Perception of space through representation media: a comparison between 2D representation techniques and 3D virtual environments/“. [s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/mimarlik/T000367.pdf.
Der volle Inhalt der QuelleShirazi, Seyed Reza. „Cinematic Space: a Study of Representation in Iranian Films“. Thesis, Birmingham City University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485769.
Der volle Inhalt der QuelleAthapattu, Chathurika Umayangani. „PARABOLICALLY INDUCED BANACH SPACE REPRESENTATION OF P-ADIC GROUPS“. OpenSIUC, 2020. https://opensiuc.lib.siu.edu/dissertations/1783.
Der volle Inhalt der QuelleLourtau, Benjamin. „Optimizing the representation of space in the parietal cortex“. Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119391.
Der volle Inhalt der QuelleLa possibilité de décoder précisément et fidèlement l'intention de mouvement à partir de l'activité cérébrale d'un patient est nécessaire au développement d'une prothèse cognitive neurale optimale qui puisse subvenir aux besoins de patients atteints d'une dysfonction du système moteur. L'utilisation de matrices de microélectrodes implantables pour échantillonner l'activité neuronale mène souvent à un biais spatial dans la représentation directionnelle des neurones prélevés en raison du petit sous-ensemble de neurones qui peut être simultanément capturés par les microélectrodes. Plusieurs études utilisant des interfaces cerveau-machine (ICM) ont rapporté que l'activité neuronale corticale est dynamique suite au contrôle d'un périphérique externe. Dans cette étude, nous avons étudié la capacité des neurones prélevés à subir une réorganisation fonctionnelle conduisant à une optimisation de la représentation de l'espace dans les neurones codant l'intention de mouvement suite à la remise d'une récompense variable associée à l'algorithme adaptatif de décodage utilisé par le IMC. Nous avons enregistré l'activité neuronale en utilisant 72 électrodes implantées dans le cortex pariétal postérieur et prémoteur dorsale d'un Macaque rhésus (PNH). L'IMC a été conçu de telle manière à utiliser un décodeur adaptatif bayésien pour prédire l'intention de mouvement du PNH, avec un essai réussi établi lorsque le décodeur prédit correctement le mouvement indiqué. La valeur de la récompense reçue par le primate était proportionnelle à la capacité du décodeur à prédire avec précision le mouvement indiqué ainsi qu'un rétrocontrôle visuel de sa performance au cours de la tâche. Nous établissons la présence de neurones stables au travers de plusieurs sessions d'enregistrement et découvrons des changements importants dans la représentation de l'espace dans le sous-ensemble de neurones prélevés par les réseaux de microélectrodes, qui coïncide avec une amélioration des performances de décodage. Ces résultats suggèrent que les changements neuronaux peuvent être activement induits par l'utilisation de la récompense, ce qui conduit à une réorganisation et une optimisation de la représentation de l'espace dans le cortex pariétal et une augmentation de la quantité d'information disponible au décodeur.
Samsonovich, Alexei Vladimir 1956. „Attractor map theory of the hippocampal representation of space“. Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282347.
Der volle Inhalt der QuelleNGUYEN, DONG HAI PHUONG. „Toward Robots with Peripersonal Space Representation for Adaptive Behaviors“. Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/942472.
Der volle Inhalt der QuelleTira, Michael D. „More than space. A new insight into number representation“. Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424305.
Der volle Inhalt der QuelleCome possiamo rappresentare i numeri e fare calcoli matematici? Questa domanda è l'obiettivo principale del presente lavoro e cade nel campo della cognizione matematica, il quale si interessa dei processi cognitivi e neurologici che sottendono le abilità matematiche. L'ipotesi della linea numerica mentale (MNL) prevede che i numeri siano rappresentati mentalmente sottoforma di una misura continua (analogica) con valori numerici crescenti da sinistra a destra. La MNL viene considerata uno dei migliori modelli per la rappresentazione mentale dei numeri. Molti studi hanno esaminato la MNL considerando l’effetto SNARC (Spatial-Numerical Association of Response Codes) come prova per una connessione univoca tra spazio e numero. Tuttavia, è stato dimostrato che la rappresentazione mentale di valori piccoli a sinistra e di valori più grandi esiste anche per grandezze diverse dalla numerosità, compresa la durata temporale e la grandezza fisica. Queste osservazioni convergono con l'idea di un sistema dove diverse grandezze (ad esempio tempo, spazio e numerosità) condividono risorse neurali e concettuali, definito sistema generale di elaborazione delle grandezze (GMS). Questo solleva un'importante domanda sulla natura delle informazioni rappresentate lungo la MNL: si tratta esclusivamente di informazioni numeriche? Il presente lavoro è diviso in 4 capitoli. Il capitolo 1 affronta diversi problemi riguardanti la rappresentazione mentale dei numeri. La ricerca nel campo della cognizione matematica ha una lunga storia e ha fatto notevoli progressi negli ultimi decenni; a volte questo grande volume di dati rende difficile ottenere una visione globale di quello che è lo stato dell'arte. Per questo motivo il Capitolo 1 offrirà una 1panoramica dei diversi modelli di rappresentazione mentale dei numeri, sia innati che acquisiti, precisi o approssimati, simbolici o non simbolici. Prima di tutto sono elencate le principali scoperte sulla rappresentazione mentale dei numeri; in secondo luogo verrà presentata una carrellata sulla letteratura che mostra come le rappresentazioni di tempo, spazio, intensità e numero interagiscano tra loro e probabilmente condividano meccanismi di elaborazione; questo fornirà un adeguato contesto teorico necessario alla chiara comprensione dei lavori sperimentali presentati nei capitoli successivi. Una gran quantità di risultati scientifici dimostra che la rappresentazione e l'elaborazione dei numeri siano associate all'attivazione di una rappresentazione di natura spaziale. Una delle posizioni canoniche della cognizione numerica a tal riguardo afferma che la codifica spaziale è una componente imprescindibile della rappresentazione mentale a lungo termine dei numeri. Secondo questa idea, che porta il nome di ipotesi della linea numerica mentale, i numeri sarebbero rappresentati come una linea continua con i numeri più piccoli a sinistra e quelli più grandi a destra. Tuttavia l'origine dell'associazione tra numeri e spazio non è stata ancora totalmente chiarita. Verranno presentati degli studi che dimostrano come la codifica spaziale dei numeri non sia, in effetti, stabile nè necessariamente il risultato di un'associazione a lungo termine, ma al contrario sia una rappresentazione flessibile costruita a partire dalle necessità di elaborazione delle informazioni specifiche per i compiti che ogniuno di noi si trova a svolgere quotidianamente. Inoltre saranno presi in considerazione studi sull'associazione dei numeri con grandezze prive di caratteristiche spaziali. Nel Capitolo 2 viene presentata una serie di tre studi sperimentali ed in ognuno di essi è stato impiegato un metodo di risposta basato sulla produzione di numerosità. I partecipanti hanno eseguito un compito di aritmetica approssimata su numeri presentati, a seconda dello studio, in notazione simbolica o non simbolica. In tutti gli studi presentati i partecipanti sono stati istruiti ad utilizzare un metodo di risposta caratterizzato dalla produzione di numerosità non simboliche, essi infatti fornivano la risposta al compito specifico nel quale erano impegnati attraverso la produzione, sullo schermo di un computer, di un insieme di punti la cui numerosità era controllata dalla rotazione di una manopola posta davanti ai partecipanti e connessa al computer. Un apposito programma si occupava di registrare il grado di rotazione della manopola ed aggiornare il numero di punti presentati sullo schermo. Lo studio 1 presenta due esperimenti in cui i partecipanti giudicavano la numerosità media tra due insiemi di punti presentati in sequenza. Nell'Esperimento 1 di questo studio, i partecipanti utilizzavano una scala di numerica di risposta da 0 a20 (scala categorica), mentre nell'Esperimento 2 la risposta è stata data attraverso il metodo di risposta basato sulla produzione di numerosità. I risultati di questo studio hanno mostrato come le risposte siano state fornite secondo un modello di integrazione Average. Questo suggerisce una linearità nella scala risposta per entrambi i metodi usati nel compito di aritmetica approssimativa. Più importante, i due operandi mostravano di esercitare la stessa influenza sulla risposta fornita dai partecipanti, il che esclude un effetto sequenza o recenza legata ai compiti impiegati. Questi due esperimenti sono serviti come strumento di validazione del metodo di risposta basato sulla produzione di numerosità al fine della sua applicazione negli studi successivi. Lo Studio 2 presenta un esperimento in cui il metodo di risposta basato sulla produzione di numerosità è stato utilizzato per testare l'effetto della forza necessaria a ruotare la manopola usata per portare a termine un compito di aritmetica mentale. In particolare si è verificata l'influenza della variabile Forza sull'effetto denominato Operational Momentum (OM). L'effetto OM è la tendenza sistematica a sovrastimare i risultati di addizione e a sottovalutare i risultati di sottrazioni in condizioni che impediscono un esatto conteggio. In questo esperimento la forza necessaria per ruotare la manopola è stata manipolata in tre blocchi tra i soggetti. La letteratura ha suggerito che l'effetto OM possa dipendere da una rappresentazione spaziale dei numeri; tuttavia i risultati di questo studio dimostrano che l'eliminazione di un feedback psicomotorio quale la forza richiesta per ruotare la manopola, porta all'annullamento della differenza tra addizioni e sottrazioni. I risultati di questo studio forniscono evidenze sperimentali dell'influenza di una grandezza priva di connotazioni spaziali quale la Forza su un fenomeno di aritmetica mentale come l'effetto OM. Questo risultato è particolarmente interessante considerando che la Forza fosse una variabile interamente irrilevante per lo svolgimento del compito. Lo Studio 3 presenta un esperimento sul confronto tra quattro diversi effetti classicamente considerati esempi dell'automaticità dell'attivazione di codici spaziali durante l'elaborazione di informazioni numeriche. Gli effetti che sono stati considerati in questo studio sono l'effetto SNARC, l'effetto distanza, l'effetto di congruenza delle dimensioni e l'effetto OM. L'effetto SNARC: la tendenza ad essere più veloci nel rispondere a numeri piccoli sulla sinistra e a numeri più grandi a destra. L'effetto distanza: il fatto per cui numeri vicini tra loro sono piu difficili da discriminare rispetto a numeri distanti tra loro. L'effetto di congruenza delle dimensioni: il fatto che i numeri sono identificati come maggiori o minori di 5 più rapidamente se la loro dimensione fisica è congruente con la loro grandezza numerica. Ultimo ma non meno importante, l'effetto OM. Tali effetti sono stati testati insieme per indagare i rapporti che li legano con un approccio basato sulle differenze individuali. La presenza di ognuno degli effetti è stata verificata. Al fine di valutare la correlazione tra i vari effetti in esame, è stato calcolato il coefficiente di regressione lineare di ciascun effetto su ognuno dei partecipanti. I risultati di questo studio, anche se non conclusivi, puntano in direzione di una rappresentazione mentale comune tra gli effetti numerici testati (effetto SNARC, effetto di congruenza della dimensione, effetto distanza). L'effetto OM, inoltre, sembra correlare negativamente con l'effetto SNARC, suggerendo una connessione tra i due, ma contraddicendo la teoria della linea numerica mentale. Nel capitolo 3 si traggono conclusioni sul lavoro sperimentale presentato tenendo conto di diversi quadri esplicativi. Il presente lavoro di ricerca utilizza un metodo di risposta per compiti numerici relativamente poco noto: il metodo di risposta basato sulla produzione di numerosità. Questo metodo presenta una vasta gamma di applicazioni e apre nuovi scenari nel campo della cognizione matematica, fornendo un valido strumento per comprendere nel dettaglio le implicazioni dell'azione nella cognizione matematica. Gli esperimenti qui presentati, inoltre, forniscono indicazioni chiare rispetto al ruolo del feedback psicomotorio con caratteristiche non spaziali in compiti di aritmetica mentale portati a termine attraverso un metodi di risposta basato sulla produzione di numerosità, mettendo così in discussione l'interpretazione classica dell'effetto OM come effetto derivato da una rappresentazione puramente spaziale dei numeri. Considerando che le informazioni riguardanti la forza sono state presentate attraverso un feedback tattile mentre le informazioni numeriche sono state presentate visivamente, tale integrazione tra modalità sensoriali diverse è coerente con l'ipotesi di un sistema generale per le grandezze. Lo studio 3 confrontando, a nostra conoscenza per la prima volta, diversi effetti legati all'ipotesi della linea numerica mentale, fornisce nuove informazioni sui meccanismi di elaborazioni condivisi a questi classici effetti nel campo della cognizione matematica. I nostri risultati, anche se non conclusivi, rinnovano la domanda sulla natura della rappresentazione mentale dei numeri.
Balestra, Alisa. „Shift in Work, Shift in Representation: Working-Class Identity and Experience in U.S. Multi-Ethnic and Queer Women's Fiction“. Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1303080667.
Der volle Inhalt der QuelleHeath, Claude P. R. „Drawing out interaction : lines around shared space“. Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8817.
Der volle Inhalt der QuelleDe, Matos Monteiro João André. „Exploring the latent space between brain and behaviour using eigen-decomposition methods“. Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/10022771/.
Der volle Inhalt der QuelleWang, Shuo. „Joint Analysis of Social and Item Response Networks with Latent Space Models“. The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1571918340162685.
Der volle Inhalt der QuelleLarsen, Jeffrey James. „Continuum structural representation of flexure and tension stiffened one-dimensional spacecraft architectures“. Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/larsen/LarsenJ0509.pdf.
Der volle Inhalt der QuelleCraig, Douglas, und craig douglas@rmit edu au. „re:Making, making as a continual remaking of space“. RMIT University. Architecture and Design, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080208.151424.
Der volle Inhalt der QuelleLeung, Lai-pik Anne. „Visible/invisible space representation and remapping of a globalizing China /“. Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38680701.
Der volle Inhalt der QuellePadilla, Margara Tejera. „Space-time representation and editing of 3D video mesh sequences“. Thesis, University of Surrey, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616956.
Der volle Inhalt der QuelleLeung, Lai-pik Anne, und 梁麗碧. „Visible/invisible space: representation and remapping of a globalizing China“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38680701.
Der volle Inhalt der QuelleNicol, Craig Andrew. „Development and exploration of a timbre space representation of audio“. Thesis, University of Glasgow, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426612.
Der volle Inhalt der QuelleGlencross, Alexander Iain. „Invariant differential operators on the representation space of a quiver“. Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366103.
Der volle Inhalt der QuelleRatan, Naren. „Complex phase space representation of plasma waves : theory and applications“. Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:af5654e3-3137-4d9a-b41d-574cd72103b2.
Der volle Inhalt der QuelleFransson, Jonathan, und Elon Olsson. „Visualization of Space Debris using Orbital Representation and Volume Rendering“. Thesis, Linköpings universitet, Medie- och Informationsteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-162162.
Der volle Inhalt der QuelleWei, Shu-Mei. „Unpacking identities : performing diasporic space in contemporary Taiwanese theatre“. Thesis, University of Warwick, 2003. http://wrap.warwick.ac.uk/1201/.
Der volle Inhalt der QuelleSudirman. „Colour image coding indexing and retrieval using binary space partition tree“. Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275171.
Der volle Inhalt der QuelleAttewell, Wesley. „Wandering the streets of "Baghdad" : space, representation, and the colonial present“. Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/13851.
Der volle Inhalt der QuelleGordon, Andrew David Hamilton. „Civic and symbolic space in representation and ritual in the Renaissance“. Thesis, Queen Mary, University of London, 1999. http://qmro.qmul.ac.uk/xmlui/handle/123456789/1523.
Der volle Inhalt der QuelleOkamoto, Hiroshi 1968. „Time, speed and perception : intervals in the representation of architectural space“. Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/37560.
Der volle Inhalt der QuelleIncludes bibliographical references (leaves 52-54).
Although the notion of "space" in architecture is a relatively contemporary one, this research looks at the difference between the conception and representation of space and the actual material reality. With contemporary thought brought about by the modern measure, as architects formalize their ideas in representations, this paper argues that there arises a tendency to quantify and objectify the represented space and discount the experiential nature of the space. This research was initiated in reaction to this tendency to conceive of space as a given, formal static container in search of a wider notion of space as a product of interactions between various dynamics. Using small time based representational design experiments as well as specific precedents of conceptions and representations of space as running parallel points of reference; this investigation explores the element of time as one of the possible components of the various dynamics that produce space. Specifically, a non-chronological look at the modern, contemporary and pre-modern notion of time was taken to explore possible alternative conceptions and representations of space and time, contending that space is neither static or exclusive of time, nor is it a stage set for speed. In other words, this paper concludes that space and time are first and foremost products of experience.
by Hiroshi Okamoto.
S.M.