Global ETD Search

1	An Algorithm to Recognize Multi-Stable Behavior From an Ensemble of Stochastic Simulation Runs Monzon, Eduardo 01 December 2013 (has links) Synthetic biological designers are demanding tools to help with the design and verifica- tion process of new biological models. Some of the most common tools available aggregate multiple simulation results into one “clean” trajectory that hopefully is representative of the system’s behavior. However, for systems exhibiting multiple stable states, these techniques fail to show all the possible trajectories of the system. This work introduces a method capable of detecting the presence of more than one “typical” trajectory in a system, which can also be integrated with other available simulation tools. algorithm multi-stable behavior stochastic simulation Electrical and Computer Engineering
2	Highly Reflective Multi-stable Electrofluidic Display Pixels Yang, Shu 20 April 2012 (has links) No description available. Engineering electrofluidic display multi-stable highly reflective electrowetting
3	Cellular Neural Networks with Switching Connections Devoe, Malcom, Devoe, Malcom W, Jr. 06 May 2012 (has links) Artificial neural networks are widely used for parallel processing of data analysis and visual information. The most prominent example of artificial neural networks is a cellular neural network (CNN), composed from two-dimensional arrays of simple first-order dynamical systems (“cells”) that are interconnected by wires. The information, to be processed by a CNN, represents the initial state of the network, and the parallel information processing is performed by converging to one of the stable spatial equilibrium states of the multi-stable CNN. This thesis studies a specific type of CNNs designed to perform the winner-take-all function of finding the largest among the n numbers, using the network dynamics. In a wider context, this amounts to automatically detecting a target spot in the given visual picture. The research, reported in this thesis, demonstrates that the addition of fast on-off switching (blinking) connections significantly improves the functionality of winner-take-all CNNs. Numerical calculations are performed to reveal the dependence of the probability, that the CNN correctly classifies the largest number, on the switching frequency. Networks Cellular neural network Winner-Take-All Blinking connections Multi-stable system Averaging
4	Atenção para tarefas simples e complexas nas perspectivas de primeira e terceira pessoa : um experimento fenomenológico / Attention to simple and complex tasks in the perspectives of first and third person: a phenomenological experiment Rosemberg, Daniel January 2008 (has links) Compara-se o desempenho atentivo entre tarefas moleculares (foco em tarefas simples e reduzidas), para as quais o sentido é uma atribuição externa, com tarefas molares (foco em tarefas complexas que requerem apreensão abstrata e global), para as quais o sentido é uma atribuição interna. A pesquisa foi organizada em três estudos. No primeiro, exibiu-se o filme de curta-metragem "i" a 26 alunos de graduação para levantamento de propriedades atencionais molares de um campo multi-estável. Solicitou-se aos participantes que apresentassem um relato livre sobre o filme, logo após a exibição. A análise fenomenológica semiótica dos relatos interpretou que o filme continha apelo emocional, mobilizava a atenção, e provocava a reflexão do espectador sobre si mesmo. No segundo estudo, aplicou-se o Questionário Rosemberg de Atenção em 140 estudantes universitários, para levantamento de propriedades psicométricas. O instrumento é um autorelato da percepção da experiência atentiva de desempenho modesto (alfa=0,60). No entanto, a análise fatorial foi promissora, pois confirmou a propriedade dos itens, sugerindo a inclusão de novos itens e a exploração da atenção para tarefas repetitivas. O terceiro estudo foi um experimento fenomenológico realizado com 22 estudantes de pósgraduação em Psicologia. Verificou-se a influência de uma tarefa molecular como distrator, a contagem do aparecimento duplicado do protagonista em cena, em uma tarefa molar, a apreensão da mensagem do filme. Foram aplicados três instrumentos, na seguinte ordem: 1) Teste de Atenção Concentrada (dados de terceira pessoa), 2) Questionário Rosemberg de Atenção (dados de primeira pessoa), 3) Exibição do curta-metragem "i" (combinação de dados de primeira e terceira pessoa). Os resultados para tarefa atribuída em contexto fechado foram compatíveis aos achados já obtidos pela observação de terceira pessoa (psicologia experimental), como sugeriu a correlação entre a atenção concentrado e a indicação de aparições duplicadas do protagonista em cena. Por conseguinte, os dados de terceira pessoa não se correlacionaram com os dados de primeira pessoa. No entanto, a tarefa que requeria atenção como ponto de partida, implicando desdobramentos cognitivos complexos, foi realizada a contento (significância qualitativa). Os resultados sugerem que o processo reflexivo, necessariamente dependente da atenção, utiliza-se da plasticidade cognitiva para recompor o sentido a sua maneira, excluindo o que aparentemente for supérfluo para constituição da mensagem. / This paper compares the attention performance between molecular task (focus on simple and reduced tasks), which the attribution of meaning is external; with molar task (focus on complex task that require abstract and global apprehension), which the attribution of meaning is internal. The investigation was organized into three studies. First, it was presented the short-length movie "i" to 26 undergraduate students in psychology, to undertake the molar attention proprieties as a multi-stable field. It was asked to the participants to write a free reports right after the movies exhibition. A phenomenological semiotic analysis of the reports interpreted that the movie was pregnant of emotional appeal, mobilized viewers’ attention, and invited the participants to reflect about themselves. Second, it was applied the Rosemberg’s Attention Questionnaire to 140 universities student to examined the psychometrical proprieties. The measure is a selfreport about the experience of attention and the results were modest (alpha=.60). However, the factorial analysis was encouraging. The items used were adequate, but it suggested an increase in number and in spectrum, to explore the attention to repeat tasks. Third, it was developed a phenomenological experiment to verify the influence of a distractor as molecular task (counting the protagonist duplicate appearance in scene) in a molar task (meaning apprehension of the movie). Twenty-two graduate psychology students were asked to respond to three instruments in the following sequence: 1) Concentrated Attention Test (third person data); 2) Rosemberg’s Attention Questionnaire (first person data); 3) Exhibition of the short-length movie "i" (first and third person data). The results for the external attribution were compatible with third person information already knew (experimental psychology), as showed in the significant correlation between concentrated attention and counting the protagonist duplicate appearance in scene. Therefore, first person data did not correlated with third person data. However, the performance for the molar task was successful (qualitative significance). The results suggest that the reflexive process is necessarily dependent on attention, but uses cognitive plasticity for meaning composition, excluding the apparently superfluous in the constitution of a message. Percepção Atenção Processos cognitivos Psicologia experimental Fenomenologia Perception Experimental phenomenology Multi-stable field
5	Atenção para tarefas simples e complexas nas perspectivas de primeira e terceira pessoa : um experimento fenomenológico / Attention to simple and complex tasks in the perspectives of first and third person: a phenomenological experiment Rosemberg, Daniel January 2008 (has links) Compara-se o desempenho atentivo entre tarefas moleculares (foco em tarefas simples e reduzidas), para as quais o sentido é uma atribuição externa, com tarefas molares (foco em tarefas complexas que requerem apreensão abstrata e global), para as quais o sentido é uma atribuição interna. A pesquisa foi organizada em três estudos. No primeiro, exibiu-se o filme de curta-metragem "i" a 26 alunos de graduação para levantamento de propriedades atencionais molares de um campo multi-estável. Solicitou-se aos participantes que apresentassem um relato livre sobre o filme, logo após a exibição. A análise fenomenológica semiótica dos relatos interpretou que o filme continha apelo emocional, mobilizava a atenção, e provocava a reflexão do espectador sobre si mesmo. No segundo estudo, aplicou-se o Questionário Rosemberg de Atenção em 140 estudantes universitários, para levantamento de propriedades psicométricas. O instrumento é um autorelato da percepção da experiência atentiva de desempenho modesto (alfa=0,60). No entanto, a análise fatorial foi promissora, pois confirmou a propriedade dos itens, sugerindo a inclusão de novos itens e a exploração da atenção para tarefas repetitivas. O terceiro estudo foi um experimento fenomenológico realizado com 22 estudantes de pósgraduação em Psicologia. Verificou-se a influência de uma tarefa molecular como distrator, a contagem do aparecimento duplicado do protagonista em cena, em uma tarefa molar, a apreensão da mensagem do filme. Foram aplicados três instrumentos, na seguinte ordem: 1) Teste de Atenção Concentrada (dados de terceira pessoa), 2) Questionário Rosemberg de Atenção (dados de primeira pessoa), 3) Exibição do curta-metragem "i" (combinação de dados de primeira e terceira pessoa). Os resultados para tarefa atribuída em contexto fechado foram compatíveis aos achados já obtidos pela observação de terceira pessoa (psicologia experimental), como sugeriu a correlação entre a atenção concentrado e a indicação de aparições duplicadas do protagonista em cena. Por conseguinte, os dados de terceira pessoa não se correlacionaram com os dados de primeira pessoa. No entanto, a tarefa que requeria atenção como ponto de partida, implicando desdobramentos cognitivos complexos, foi realizada a contento (significância qualitativa). Os resultados sugerem que o processo reflexivo, necessariamente dependente da atenção, utiliza-se da plasticidade cognitiva para recompor o sentido a sua maneira, excluindo o que aparentemente for supérfluo para constituição da mensagem. / This paper compares the attention performance between molecular task (focus on simple and reduced tasks), which the attribution of meaning is external; with molar task (focus on complex task that require abstract and global apprehension), which the attribution of meaning is internal. The investigation was organized into three studies. First, it was presented the short-length movie "i" to 26 undergraduate students in psychology, to undertake the molar attention proprieties as a multi-stable field. It was asked to the participants to write a free reports right after the movies exhibition. A phenomenological semiotic analysis of the reports interpreted that the movie was pregnant of emotional appeal, mobilized viewers’ attention, and invited the participants to reflect about themselves. Second, it was applied the Rosemberg’s Attention Questionnaire to 140 universities student to examined the psychometrical proprieties. The measure is a selfreport about the experience of attention and the results were modest (alpha=.60). However, the factorial analysis was encouraging. The items used were adequate, but it suggested an increase in number and in spectrum, to explore the attention to repeat tasks. Third, it was developed a phenomenological experiment to verify the influence of a distractor as molecular task (counting the protagonist duplicate appearance in scene) in a molar task (meaning apprehension of the movie). Twenty-two graduate psychology students were asked to respond to three instruments in the following sequence: 1) Concentrated Attention Test (third person data); 2) Rosemberg’s Attention Questionnaire (first person data); 3) Exhibition of the short-length movie "i" (first and third person data). The results for the external attribution were compatible with third person information already knew (experimental psychology), as showed in the significant correlation between concentrated attention and counting the protagonist duplicate appearance in scene. Therefore, first person data did not correlated with third person data. However, the performance for the molar task was successful (qualitative significance). The results suggest that the reflexive process is necessarily dependent on attention, but uses cognitive plasticity for meaning composition, excluding the apparently superfluous in the constitution of a message. Percepção Atenção Processos cognitivos Psicologia experimental Fenomenologia Perception Experimental phenomenology Multi-stable field
6	Atenção para tarefas simples e complexas nas perspectivas de primeira e terceira pessoa : um experimento fenomenológico / Attention to simple and complex tasks in the perspectives of first and third person: a phenomenological experiment Rosemberg, Daniel January 2008 (has links) Compara-se o desempenho atentivo entre tarefas moleculares (foco em tarefas simples e reduzidas), para as quais o sentido é uma atribuição externa, com tarefas molares (foco em tarefas complexas que requerem apreensão abstrata e global), para as quais o sentido é uma atribuição interna. A pesquisa foi organizada em três estudos. No primeiro, exibiu-se o filme de curta-metragem "i" a 26 alunos de graduação para levantamento de propriedades atencionais molares de um campo multi-estável. Solicitou-se aos participantes que apresentassem um relato livre sobre o filme, logo após a exibição. A análise fenomenológica semiótica dos relatos interpretou que o filme continha apelo emocional, mobilizava a atenção, e provocava a reflexão do espectador sobre si mesmo. No segundo estudo, aplicou-se o Questionário Rosemberg de Atenção em 140 estudantes universitários, para levantamento de propriedades psicométricas. O instrumento é um autorelato da percepção da experiência atentiva de desempenho modesto (alfa=0,60). No entanto, a análise fatorial foi promissora, pois confirmou a propriedade dos itens, sugerindo a inclusão de novos itens e a exploração da atenção para tarefas repetitivas. O terceiro estudo foi um experimento fenomenológico realizado com 22 estudantes de pósgraduação em Psicologia. Verificou-se a influência de uma tarefa molecular como distrator, a contagem do aparecimento duplicado do protagonista em cena, em uma tarefa molar, a apreensão da mensagem do filme. Foram aplicados três instrumentos, na seguinte ordem: 1) Teste de Atenção Concentrada (dados de terceira pessoa), 2) Questionário Rosemberg de Atenção (dados de primeira pessoa), 3) Exibição do curta-metragem "i" (combinação de dados de primeira e terceira pessoa). Os resultados para tarefa atribuída em contexto fechado foram compatíveis aos achados já obtidos pela observação de terceira pessoa (psicologia experimental), como sugeriu a correlação entre a atenção concentrado e a indicação de aparições duplicadas do protagonista em cena. Por conseguinte, os dados de terceira pessoa não se correlacionaram com os dados de primeira pessoa. No entanto, a tarefa que requeria atenção como ponto de partida, implicando desdobramentos cognitivos complexos, foi realizada a contento (significância qualitativa). Os resultados sugerem que o processo reflexivo, necessariamente dependente da atenção, utiliza-se da plasticidade cognitiva para recompor o sentido a sua maneira, excluindo o que aparentemente for supérfluo para constituição da mensagem. / This paper compares the attention performance between molecular task (focus on simple and reduced tasks), which the attribution of meaning is external; with molar task (focus on complex task that require abstract and global apprehension), which the attribution of meaning is internal. The investigation was organized into three studies. First, it was presented the short-length movie "i" to 26 undergraduate students in psychology, to undertake the molar attention proprieties as a multi-stable field. It was asked to the participants to write a free reports right after the movies exhibition. A phenomenological semiotic analysis of the reports interpreted that the movie was pregnant of emotional appeal, mobilized viewers’ attention, and invited the participants to reflect about themselves. Second, it was applied the Rosemberg’s Attention Questionnaire to 140 universities student to examined the psychometrical proprieties. The measure is a selfreport about the experience of attention and the results were modest (alpha=.60). However, the factorial analysis was encouraging. The items used were adequate, but it suggested an increase in number and in spectrum, to explore the attention to repeat tasks. Third, it was developed a phenomenological experiment to verify the influence of a distractor as molecular task (counting the protagonist duplicate appearance in scene) in a molar task (meaning apprehension of the movie). Twenty-two graduate psychology students were asked to respond to three instruments in the following sequence: 1) Concentrated Attention Test (third person data); 2) Rosemberg’s Attention Questionnaire (first person data); 3) Exhibition of the short-length movie "i" (first and third person data). The results for the external attribution were compatible with third person information already knew (experimental psychology), as showed in the significant correlation between concentrated attention and counting the protagonist duplicate appearance in scene. Therefore, first person data did not correlated with third person data. However, the performance for the molar task was successful (qualitative significance). The results suggest that the reflexive process is necessarily dependent on attention, but uses cognitive plasticity for meaning composition, excluding the apparently superfluous in the constitution of a message. Percepção Atenção Processos cognitivos Psicologia experimental Fenomenologia Perception Experimental phenomenology Multi-stable field
7	Contribution to optical wireless multi-stable micro-actuation / Contribution au micro-actionnement multi-stable piloté par radiations optiques Liu, Xingxing 07 October 2015 (has links) Cette thèse traite le sujet du micro-actionnement multistable employant des radiations optiques pour atteindre les différentes positions offertes par le micro-actionneur. Dans le cadre des travaux réalisés, un mécanisme bistable reposant sur un principe de doubles poutres préformées situées en position antagoniste est proposé, et, sur cette brique élémentaire, un micro-actionneur quadristable a été conçu. Afin de valider le principe de fonctionnement de micro-actionneur, des procédés de fabrication Laser (sur le matériau « médium - MDF») puis DRIE (sur un wafer SOI de silicium) ont été utilisés. Sur le prototype en silicium, permettant une réduction des courses du rang interne et du rang externe du micro-actionneur, celles-ci ont été fixées à 300 µm et 200 µm respectivement. L’actionnement à distance de ce micro-actionneur a été prouvé en utilisant le chauffage laser d’un élément actif en Nitinol structuré par un dépôt de SiO2, ceci générant un effet « deux sens » de l’élément actif permettant d’annuler la charge sur les poutres du micro-actionneur une fois celui-ci déclenché puis en position stable. L’utilisation d’un banc expérimental incluant une membrane MEMS de balayage laser a permis de démontrer la quadristabilité du micro-actionneur sur 90 000 cycles. Afin de réduire davantage la course de ce micro-actionneur, des concepts de dispositifs de réduction de course ont été développés pour démontrer, à partir de prototypes fabriqué en MDF par usinage laser, la capacité à atteindre une course de 1 µm. Enfin, à la suite de ces travaux de réduction de course, un concept de nano-actionneur multistable a été proposé. Ce nano-actionneur est composé de quatre modules bistables liés et disposés en parallèle pour offrir 16 positions discrètes sur une course rectiligne. Les simulations de cet actionneur montrent la possibilité d’atteindre les 15 positions espacées de 10 nm sur une course de 150 nm. / In this work, a bistable mechanism based on antagonistic pre-shaped double beams was proposed. Employing the proposed bistable mechanism, a quadristable micro-actuator was designed. ln order to validate the quadristability of the device, a meso-scaled prototype was fabricated from MDF by laser cutting. After the quadristability was experimentally confirmed, a quadristable micro-actuator was realized on SOl wafer using DRIE technique. Strokes for inner row and outer row were reduced to 300 µm and 200 µm respectively. For the actuation of the quadristable micro-actuator,laser heated SMA elements with deposited Si02 layer were used to realize the optical wireless actuation. With the help of a laser beam steering micro-mirror, both inner row and outer row were successfully actuated. ln order to further reduce the stroke, a bistable actuator with stroke reducing structure was designed and a prototype eut from MDF was tested. Bistability was validated and a stroke of 1µm was experimentally achieved. Based on this bistable module, a multistable nano-actuator, which contains four parallel coupled bistable modules,was designed and simulated. The simulated result have indicated that it was capable of outputs 16 discrete stable positions available from 0 nm to 150 nm with a step of 10 nm between two stable positions. Radiations optiques MDF DRIE MEMS Multi-stable micro-actuator Two-way memory effect Stroke reducing system Smart surface Wireless actuation Micro-fabrication SMA
8	Achieving Complex Motion with Fundamental Components for Lamina Emergent Mechanisms Winder, Brian Geoffrey 01 March 2008 (has links) (PDF) Designing mechanical products in a competitive environment can present unique challenges, and designers constantly search for innovative ways to increase efficiency. One way to save space and reduce cost is to use ortho-planar compliant mechanisms which can be made from sheets of material, or lamina emergent mechanisms (LEMs). This thesis presents principles which can be used for designing LEMs. Pop-up paper mechanisms use topologies similar to LEMs, so it is advantageous to study their kinematics. This thesis outlines the use of planar and spherical kinematics to model commonly used pop-up paper mechanisms. A survey of common joint types is given, as well as an overview of common monolithic and layered mechanisms. In addition, it is shown that more complex mechanisms may be created by combining simple mechanisms in various ways. The principles presented are applied to the creation of new pop-up joints and mechanisms, which also may be used for lamina emergent mechanisms. Models of the paper mechanisms presented in Chapter 2 of the thesis are found in the appendix, and the reader is encouraged to print, cut out and assemble them. One challenge associated with spherical and spatial LEM design is creating joints with the desired motion characteristics, especially where complex spatial mechanism topologies are required. Hence, in addition to a study of paper mechanisms, some important considerations for designing joints for LEMs are presented. A technique commonly used in robotics, using serial chains of revolute and prismatic joints to approximate the motion of complex joints, is presented for use in LEMs. Important considerations such as linkage configuration and mechanism prototyping are also discussed. Another challenge in designing LEMs is creating multi-stable mechanisms with the ability to have coplanar links. A method is presented for offsetting the joint axes of a spatial compliant mechanism to introduce multi-stability. A new bistable spatial compliant linkage that uses that technique is introduced. In the interest of facilitating LEM design, the final chapter of this thesis presents a preliminary design method. While similar to traditional methods, this method includes considerations for translating the mechanism topology into a suitable configuration for use with planar layers of material. paper mechanism pop-up popup pop up mechanism linkage paper engineering paper crafts origami kinematics spatial mechanism planar mechanism bistable multi-stable spherical mechanism ortho-planar compliant PRBM pseudo-rigid-body model Lamina Emergent Mechanism LEM sheet goods planar layer complex joint elemental joint spatial joint degrees of freedom mechanism modeling mechanism design serial joint chain parallel series fundamental components complex motion revolute prismatic spherical cylindric universal half planar RSSR RCCC RSRC RTRT Altmann Bricard Bennett Goldberg 6R 4R joint axis angular offset paper joint V-fold circular arch figure-8 single slit double slit tube strap arch knee mechanism 45 degree fold solid shape floating layer tent Mechanical Engineering

Search results