Dissertations / Theses on the topic 'Interface'
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Yang, Xingzhou. "Immersed Interface Method for Elasticity Problems with Interfaces." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-07062004-175450/.
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An immersed interface method and an immersed finite element method for solving linear elasticity problems with two phases separated by an interface have been developed in this thesis. For the problem of interest, the underlying elasticity modulus is a constant in each phase but vary from phase to phase. The basic goal here is to design an efficient numerical method using a fixed Cartesian grid. The application of such a method to problems with moving interfaces driving by stresses has a great advantage: no re-meshing is needed. A local optimization strategy is employed to determine the finite difference equations at grid points near or on the interface. The bi-conjugate gradient method and the GMRES with preconditioning are both implemented to solve the resulting linear systems of equations and compared. The level set method is used to represent the interface. Numerical results are presented to show that the immersed interface method is second-order accurate.
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Normark, Carl Jörgen. "The User as Interface Designer : Personalizable Vehicle User Interfaces." Doctoral thesis, Luleå tekniska universitet, Innovation och Design, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17941.
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Godkänd; 2014; 20140407 (carnor); Nedanstående person kommer att disputera för avläggande av teknologie doktorsexamen. Namn: Carl Jörgen Normark Ämne: Industriell design/Industrial Design Avhandling: The User as Interface Designer - Personalizable Vehicle User Interfaces Opponent: Docent Ramia Mazé, gästlärare i industriell design, Konstfack University College of Arts, Crafts and Design/Skolan för arkitektur och samhällsbyggnad, Kungliga tekniska högskolan, Stockholm Ordförande: Professor Dennis Pettersson, Avd för innovation och design, Institutionen för ekonomi, teknik och samhälle, Luleå tekniska universitet Tid: Onsdag den 11 juni 2014, kl 13.00 Plats: A1545, Luleå tekniska universitet
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Denk, Matthias. "Structural investigation of solid liquid interfaces metal semiconductor interface /." [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-29148.
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Lee, Long. "Immersed interface methods for incompressible flow with moving interfaces /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/6789.
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Bonaventura, Marco. "Interface." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ31549.pdf.
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Devi, M. K. Sowmia Agrawal Prathima. "Interface selection in multi-interface mobile devices." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Theses/MYLAPORE_KRISHNA_8.pdf.
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Cinkilic, Emre. "Comparison of Interface State Spectroscopy Techniques by Characterizing Dielectric – InGaAs Interfaces." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366329582.
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Yerramilli, Vamsee K. "Numerical simulation of liquid-vapor interfaces in the sharp interface limit." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2978.
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Thesis (M.S.) -- University of Maryland, College Park, 2005.Thesis research directed by: Dept. of Mechanical Engineering. 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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Novais, Ana Elisa Costa. "Leitura nas interfaces gráficas de computador: compreendendo a gramática da interface." Universidade Federal de Minas Gerais, 2009. http://hdl.handle.net/1843/LETR-8SVRW6.
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Reading the computer graphical Interface which uses an interdisciplinary net of studies about text, design, reading and cognition in order to depict both constructions of meaning and textualization strategies is the object of this study. We have understood interface as a text, a point of contact between the author/designer and the reader/user
based on the hypotheses that both, the understanding of the relatively stable marks of those texts and the grammar that underlies that kind of genre, facilitate the transit within the interface and help to understand the dynamics that rules such semiotic system. We have chosen four students having little experience in both computing and reading
practices on computers as the object of this study. Reading tests from which the students would develop tasks on Power Point and Paint based on printed patterns were made. Those tests generated verbal protocols which were analyzed according to both the Restructured Model of reading (COSCARELLI, 1999) and the Conceptual Blending theory (FAUCONNIER, TURNER, 2002). With the restructured model in hands, we searched for theoretical support in order to deal with the domains of reading which had been activated when the tasks on computer were in progress. By articulating concepts on usability and readability, we have cast some features of the interfaces (textuality) that favor its own textualization unity recognition (access to the icons), syntactic
domain (sequence of browsing) and semantic domain (complementary reference from analogies, metaphors, generalizations, judgments, among others). Blending theory gave us the chance to know the high level cognitive operations aroused by reference processes of mental spaces activating, mapping, projections, complementation and
compressions of vital relationship (Category, Property, Analogy, Identity, Similarity, and Reference). It was possible to deconstruct some typical features of the interfaces and their variation among the programs, like differences on treating distinct objects (text, picture, textbox, and so on) and notice the difficulty faced by the users to understand them, make analogies among those objects, and understand them not only as
Complex Categories of Property, but as distinct ones as well. Reading Interfaces, we conclude, depend not only on recognizing icons and other graphic elements, but also on the integration of several formal elements that make up its complex and coherent organizational dynamics. In order to read the interfaces and use the computer, it is necessary the construction of a knowledge that evolves concepts completely different
from both literate practices and texts, and supports. The skill to cast and integrate those concepts, by making use of standard conceptual structures and more stable and coherent interfaces as much as to an ampler idea of computing, facilitates operations on computer. In this sense, the more the user disposes and articulates knowledge, the less
preconceptions of the common sense he/she raises from the blending, more confident to create and test hypotheses he/she feels to make the required connections in order to accomplish his/her tasks.A leitura das interfaces gráficas de computador, que utiliza rede interdisciplinar de estudos sobre texto, design, leitura e cognição para conhecer estratégias de construção de sentido e de textualização (COSTA VAL, 2000, 2004) nos ambientes digitais é o objeto desta pesquisa. Concebemos a interface como um texto, ponto de contato entre os autores (designers, programadores, etc.) e os leitores (usuários), e partimos da hipótese de que a compreensão das marcas relativamente estáveis desses textos e da gramática subjacente a esse gênero facilita o trânsito pela interface e auxilia na compreensão da dinâmica que rege esse sistema semiótico. Escolhemos como sujeitos da pesquisa quatro estudantes recém ingressos na universidade, com pouca vivência em informática e em práticas letradas mediadas pelos computadores. Realizamos testes de leitura a partir dos quais os estudantes deveriam desenvolver tarefas nos programas Power Point e Paint, baseadas em modelos impressos. Esses testes deram origem a protocolos verbais, os quais foram analisados à luz do Modelo Reestruturado de leitura (COSCARELLI, 1999) e da teoria da Mescla Conceptual (FAUCONNIER, TURNER, 2002). Com o modelo reestruturado, buscamos subsídios teóricos para lidar com os domínios de leitura acionados durante as atividades no computador. Articulando conceitos sobre usabilidade (TALIN, 1998; NIELSEN, 2005; TOGNAZZINI, 2003) e legibilidade (COSCARELLI, 1999; LIBERATO, FULGÊNCIO, 2004, 2007), elencamos certas características das interfaces (textualidade) que favorecem sua textualização, no reconhecimento de unidades (acesso aos ícones), no domínio sintático (seqüências de navegação) e no domínio semântico (complementações referenciais a partir de analogias, metáforas, generalizações, julgamentos, entre outros). A teoria da mesclagem permitiu-nos conhecer operações cognitivas de alto nível realizadas por processos referenciais de ativação de espaços mentais, mapeamentos, projeções, complementações e compressões de relações vitais (Categoria, Propriedade, Analogia, Identidade, Similaridade, Referência). Foi-nos possível desconstruir certas características típicas das interfaces e suas variações entre os programas, como as diferenças no tratamento de objetos distintos (texto, figura, caixa de texto, etc.) e perceber a ificuldade dos usuários para compreender essas diferenças, fazer Analogias entre esses objetos, entendê-los como Categorias de Propriedades complexas, mas distintas. A leitura na interface, concluímos, não depende apenas do reconhecimento dos ícones e outros elementos gráficos, mas da integração de diversos elementos formais que compõe sua complexa e coerente dinâmica organizacional. É preciso, para ler as interfaces e utilizar o computador, a construção de um conhecimento que envolve conceitos muitas vezes completamente diferentes de outras práticas letradas e de outros textos e suportes. A habilidade para elencar e integrar esses conceitos, recorrendo de forma criteriosa e coerente a estruturas conceptuais mais estáveis, tanto sobre interfaces quanto em relação a uma idéia mais ampla sobre informática, facilita as operações no computador. Nesse sentido, quanto mais conhecimentos o usuário dispõe e articula, quanto menos pré-conceitos do senso comum ele faz emergir na mescla, mais seguro ele vai estar para criar e testar hipóteses, fazendo as conexões necessárias para realizar suas tarefas.
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Gonzalez, Sara. "Operando Chemistry and Electronic Structure of Electrode/Ferroelectric Interfaces." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS501/document.
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Au cours des dix dernières années, les hétérostructures à base de matériaux oxyde ont été grandement étudiées comme potentiel systèmes d’application pour le nanoélectronique. Parmi eux, les ferroélectriques (FE) sont particulièrement intéressants comme support pour ces applications technologies. En effet, leur polarisation électrique spontanée, aisément réversible par application d’un champ électrique en fait de bons candidats pour le stockage de données non-volatile. Renverser la polarisation nécessite un contact avec une électrode, ainsi les hétérostructures de films mince de FE avec électrodes métalliques ont été grandement étudiées. A l’interface entre les deux matériaux, les charges libres de l’électrode permettent d’écranter les charges de surfaces, détrimentales au maintien de la polarisation au sein du film FE. Avec des électrodes d’oxyde métalliques, un déplacement ionique à l’interface électrode/FE va d’avantage favoriser cet écrantage, plaçant l’interface au cœur du processus d’écrantage. Cependant, malgré d’importantes découvertes théoriques, les données expérimentales sont rares et le comportement exact de l’interface électrode/FE est seulement partiellement maitrisée. Une plus grande compréhension est indispensable pour une intégration correcte des films FE dans des dispositifs nanométriques. Dans cette thèse, des techniques basées sur la spectroscopie de photoémission sont utilisées pour sonder l’interface enfouie d’une hétérostructure électrode/BaTiO₃/électrode, dans le cas de deux électrodes différentes : l’oxyde métallique SrRuO₃ et le métal cobalt. Nous avons acquis des informations sur le comportement de l’interface et sa réponse au renversement de la polarisation. Ce travail est un nouveau pas vers une plus grande maitrise des phénomènes physiques gouvernant le comportement de l’interface entre électrodes le ferroélectrique BaTiO₃, en termes de propriété électronique, de cinétique et de fatigue. Les expériences présentées couplent des techniques d’analyses de pointes, où l’utilisation de rayons X durs et l’application de champs électriques in situ ont rendus possible la difficile tâche de sonder des interfaces enfouies en condition de fonctionnementIn the past decade, oxide-based heterostructures have been studied extensively as potentially attractive systems for applications in nanoelectronics. Among them, ferroelectric materials raised interest as potential support for those technological applications. Indeed, their spontaneous electric polarization easily switched by applying an electric field makes them a good basis for non-volatile data storage. Switching the polarization requires a metallic contact with an electrode, thus heterostructures of ferroelectric thin films with metallic electrodes have been widely studied. At the interface between those two materials, free charges of the electrode help screening the polarization induced surface charges detrimental to maintaining proper polarization in the ferroelectric thin film. With metallic oxide electrodes, an ionic displacement at the electrode/ferroelectric interface will help the screening. However, despite important theoretical discoveries, direct experimental data is scarce and further understanding of the interface behavior is crucial for a proper integration of ferroelectric films in functioning nanometer sized devices. In this thesis, photoemission spectroscopy based techniques are used to probe the buried interface of an electrode/BaTiO₃/electrode heterostructure, for two different electrodes: the metallic oxide SrRuO₃ and the Co metal. We acquired information on the behavior of the interface and its response to polarization switching. This work is a new step towards a complete understanding on the behavior of the interface between electrodes and the BaTiO₃ ferroelectric, in device-like heterostructures, in terms of electronic properties, kinetic, and fatigue. The experiments presented combined state of the art characterization techniques, where the use of hard X-rays and in situ bias application made it possible to resolve the difficult task of probing buried interfaces in working conditions
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Lopes, Paulo Sérgio Nunes. "Interface homem-máquina para aplicações de automação residencia." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/13265.
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Mestrado em Engenharia Eletrotécnica e TelecomunicaçõesA automação em ambientes residenciais e hoje uma realidade emergente, tendo crescido nos últimos anos em função da rápida evolução tecnológica. Existe atualmente uma enorme diversificação na oferta de soluções nesta área, inovadoras e de alto desempenho, que integram o sistema de controlo com uma interface gráfica. Algumas destas soluções apenas se centram na interface com o utilizador, oferecendo elevada qualidade gráfica, assim como uma panóplia de interfaces de comunicação para quase todo o tipo de aplicações. No entanto, muitas destas solu ções são proprietárias e pouco flexíveis na adaptação a novos sistemas que possam vir a ser desenvolvidos, al em do seu elevado custo. Diante este cenário, o trabalho desenvolvido nesta Dissertação contempla o desenvolvimento de uma Interface Homem-Máquina com ecrã tátil, versátil e flexível, de baixo custo, capaz de ser utilizada em diferentes cenários da automação residencial. Como primeira abordagem, foi estudada uma plataforma de desenvolvimento (FriendlyArm Tiny6410) com requisitos idênticos aos pretendidos no trabalho desta Dissertação. Depois desta fase, foi desenvolvida toda a componente de hardware e de software da Interface Homem-Máquina e efetuados os respetivos testes. Foram também desenvolvidas interfaces gráficas de utilização simples e amigável, que permitem o controlo e monitorização local de um sistema simulado.
The home automation is an emerging reality today, having evolved on the past few years due to the growing technological evolution. There is currently a huge diversification in offering solutions in this area, very innovative and high performance, which integrate the control system with graphical interface. Some of these solutions focus only on the user interface by providing high quality graphics as well as a plethora of communication interfaces for almost all kinds of applications. However, many of these solutions are proprietary and inflexible in adapting to new systems that can be developed, in addition to its high cost. Given this scenario, the work developed on this dissertation includes the development of a Human-Machine Interface with touchscreen, versatile and flexible, low cost, capable of being used in different scenarios of home automation. As a first approach, we studied a development platform (FriendlyArm Tiny6410) with identical requirements as required on this dissertation work. After this, all the hardware and software components of the Human-Machine Interface have been developed and made the respective tests. We also developed a simple and user friendly graphical interface that allow the control and monitoring of a simulation system.
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Kus, Emre. "Myoelectric Interface." Thesis, Mälardalen University, School of Innovation, Design and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-6326.
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The intention of this thesis project report is to control a servo motor by using Electromyography(EMG) signals in the purpose of learning about bioamplifers and how ATMEL AVR Series microcontrollers work.
EMG is the a test that is used to record the electrical activity of muscles. In order to fulfill our intention an EMG amplifier, an ADC converter and a servo motor controller is build to be used with the simple mechenical gripper where the control of the gripper is directly related with the amplitude of the EMG signals taken from the hand muscles. In the development and USART serial communication part is also added enabling to see the ADC results in computer.
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Rodway, G. H. "Interface kinetics." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258163.
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Kapadia, Niraj. "User | Interface." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1306501343.
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Schubert, Edson Gellert. "Uma linguagem de definição e manipulação de interfaces com o usuário." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 1991. http://hdl.handle.net/10183/24185.
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Uma interface com o usuário é composta por duas "vias" de comunicação, uma que vai do usuário até o sistema e outra que vai do sistema até o usuário. Cada uma destas "vias" possui um formalismo que define a comunicação associado. Neste trabalho, estes formalismos são descritos com uma gramática de atributos. Esta gramática foi expandida de forma a permitir a definição dos elementos que compõe a interface do usuário, e da estrutura que irá controlar a seqüência de execução das tarefas oferecidas pelos sistemas de aplicação. Ao longo do trabalho são discutidas algumas técnicas de descrição do formalismo de comunicação entre interface e sistema, são abordados os estilos de interação e apresentada as expansões aplicadas sobre gramáticas de atributos. Um exemplo auxilia a compreensão do uso da linguagem proposta, e um protótipo permite a validação das definições.A user interface is composed by two "ways" of communication, one from the user to the system and the other linking the system to the user. Each of these "ways" has it's own mechanism. In this work, these mechanisms are described through an attribute grammar. This grammar has been expanded to allow the definition of the structure of the interface elements and the control of the execution of the tasks that the application system implements. Through this work, technics that describe the communication between the interface and the system, interaction styles and the extensions made on attribute grammar are discussed. An example is given to explain the use of the proposed mechanism and a prototype validates ideas discussed.
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Phanouriou, Constantinos. "UIML: A Device-Independent User Interface Markup Language." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28625.
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This dissertation proposes a comprehensive solution to the problem of building device-independent (or multi-channel) user interfaces promoting the separation of the interface from the application logic. It introduces an interface model (Meta-Interface Model, or MIM) for separating the user interface from the application logic and the presentation device. MIM divides the interface into three components, presentation, interface, and logic, that are connected with abstract vocabularies designed in terms of user chosen abstraction. The logic component provides a canonical way for the user interface to communicate with an application. The presentation component provides a canonical way for the user interface to render itself independently of the platform. The interface component describes the interaction between the user and the application using a set of abstract parts, events, and method calls that are device and application independent. MIM goes one step further than earlier models and subdivides the interface into four additional subcomponents: structure, style, content, and behavior. The structure describes the organization of the parts in the interface, the style describes the presentation specific properties of each part, the content describes the information that is presented to the user, and the behavior describes user interaction with the interface in a platform-independent manner. This dissertation also presents the second version of the User Interface Markup Language (UIML2), a declarative language that derives its syntax from XML and realizes the MIM model. It also gives the design rationale behind the language and discusses the implementation issues for mapping UIML2 to various devices (Java/JFC, PalmOS, WML, HTML, and VoiceXML). Finally, this dissertation evaluates UIML2 in terms of its goals, and among the major ones are to provide a canonical format for describing interfaces that map to multiple devices and to generate one description of a user interface connection to the application logic independent of target device.Ph. D.
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Sá, Cristina Fernandes Alves de. "O que é o interface? Da entificação á identificação do interface enquanto complexo mediador." Doctoral thesis, Faculdade de Ciências Sociais e Humanas, Universidade Nova de Lisboa, 2010. http://hdl.handle.net/10362/5582.
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Dissertação apresentada para cumprimento dos requisitos necessários à obtenção do
grau de Doutor em Ciências da ComunicaçãoNeste estudo sobre o interface, desenvolve-se um quadro crítico a partir do qual se podem recortar diversas facetas deste elemento do real. Explora-se a condição de interface, reconhecendo-lhe a sua dimensão relacional, mas constituindo-o como uma entidade em si e identificando-o como um mediador de acessos controlados. O objectivo central desta dissertação é contribuir para a definição de interface, expondo directamente o que “é” e não apenas o que “faz”. Coloca-se o foco de atenção sobre este operador de passagens diversas, cuja presença em contextos distintos implica um estudo transversal e multidisciplinar. A entificação do interface passa pela sua inscrição no espaço-tempo e pela atribuição de uma substância constitutiva capaz de lhe conferir uma consistência dinâmica adequada. Esta inscrição espaciotemporal liga-o à noção de experiência e, consequentemente, à de mediação, não apenas como suporte teórico, mas também em termos práticos. Escolhe-se o interface entre o homem e o computador como paradigma para este estudo, usando-o como porta de entrada para a cultura digital, onde a questão da presença/superação do interface é central e define o aparelhamento da subjectividade, a matematização da imagem e a expressão criativa das artes digitais: mais próximas do virtual (código programado), ou mais próximas do actual (design de interfaces). Do trabalho de entificação resulta que o interface é um espaço de vibração e de passagem, um espaço n-dimensional, limitado pelos sistemas que coloca em relação. Entende-se a sua dimensão temporal como iterativa, de conciliação rítmica e de eventual sincronização inter-sistemas. A matéria plástica confere-lhe a capacidade de moldagem dinâmica e a possibilidade de acolher heterogeneidades (por encapsulamento) sem prejuízo da sua unidade. A identificação da entidade-interface como complexo mediador baseia-se nas estratégias e possibilidades abertas pela imediação e hipermediação enquanto movimentos contraditórios indissociáveis. Conclui-se que o interface, enquanto processo mediador, deverá oscilar entre a transparência (associada à imediação) e a opacidade (associada à hipermediação), existindo de uma e outra forma à vez – comutativamente. Na presente cultura digital, o interface invade os territórios da subjectividade, da imagem e da arte, introduzindo-lhes uma matriz de sintetização heterogénea por encapsulamento da sua condição técnica. Ele perpassa o sujeito, refundando o conceito de fronteira como complexo aberto a várias ligações. Ele perpassa a sociabilidade, reformulando o sentido comunitário pela desmultiplicação das membranas étnicas. Ele promove uma leitura da imagem como complexo sensível/inteligível, inaugurando uma visualização híbrida no seu modo, e recorrente no seu processo. Finalmente, ele constitui-se como o modo de acesso à obra de arte, como território de passagens moldáveis, deslocando a noção de obra e de espaço de intervenção do artista. Pelo exposto, entende-se que a contribuição principal desta dissertação é a criação de um quadro de envolvência teórica a partir do qual se pode pensar o interface, não apenas em termos de mediação, conforme foi adiantado neste estudo, mas pelos contornos que as reflexões futuras exijam. Paralelamente, a presente investigação abre caminhos de exploração prática e empírica em diversas áreas, nomeadamente no design de interfaces e nas artes digitais.
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Keeble, Richard John. "An adaptive environment for personal information management." Thesis, Brunel University, 1999. http://bura.brunel.ac.uk/handle/2438/6509.
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This dissertation reports the results of research into the provision of adaptive user interfaces to support individuals in the management of their personal information. Many individuals find that they have increased responsibility for managing aspects of their own lives, including the information associated with their jobs. In contrast with traditional approaches to information management, which are generally driven by organisational or business requirements, the requirements of personal information management systems tend to be less rigidly defined. This dissertation employs research from the areas of personal information management and adaptive user interfaces - systems which can monitor how they are used, and adapt on a personal level to their user - to address some of the particular requirements of personal information management systems. An adaptive user interface can be implemented using a variety of techniques, and this dissertation draws on research from the area of software agents to suggest that reactive software agents can be fruitfully applied to realise the required adaptivity. The reactive approach is then used in the specification and development of an adaptive interface which supports simple elements of personal information management tasks. The resulting application is evaluated by means of user trials and a usability inspection, and the theoretical architectures and techniques used in the specification and development of the software are critically appraised. The dissertation demonstrates an application of reactive software agents in adaptive systems design and shows how the behaviour of the system can be specified based on the analysis of some representative personal information management tasks.
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Lachman, Richard W. 1972. "Animist interface : experiments in mapping character animation to computer interface." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/61831.
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Murdoch, Michael J. "Nonverbal vocal interface /." Link to online version, 2006. https://ritdml.rit.edu/dspace/handle/1850/10346.
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Johansson, Morgan. "Ion current interface." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4000.
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Abstract
Abstract The reason to measure the ion current in a combustion engine is to extract combustion parameters in order to achieve closed loop control of the combustion i.e. control of the spark, fuel and air into the engine. By using the spark plug, in a spark-ignited engine, as a probe it is possible to measure the ion current.
The purpose with this thesis is to improve an existing ion current interface.
A ringing caused by the ignition coil will follow by the ion current signal. Now the need of energy in the spark increase. Since increased energy in the spark gives a longer burn time and a longer ringing the ringing will extend into the ion current signal. The problem with the old interface is that the ringing is not symmetrical which could cause problems when filtering the signal.
The aim of this thesis is to achieve a symmetrical ringing and a interface that can handle an ion current amplitude from 0,1µA to 1mA.
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Hansson, Henrik. "Craft Physics Interface." Thesis, Linköping University, Department of Computer and Information Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8497.
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This is a masters thesis (20p) in computer science at the University of Linköping. This thesis will give an introduction to what a physics engine is and what it consist of. It will put some engines under the magnifying glass and test them in a couple of runtime tests. Two cutting edge commercial physics engines have been examined, trying to predict the future of physics engines. From the research and test results, an interface for physics engine independency has been implemented for a company called Craft Animations in Gothenburg, Sweden.
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Johnson, Samuel. "Document Clustering Interface." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-112878.
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This project created a first step prototype interface for a document clustering search engine. The goal is to facilitate the needs of people with reading difficulties as well as being a useful tool for general users when trying to find relevant but easy to read documents. The hypothesis is that minimizing the amount of text and focus on graphical representation will make the service easier to use for all users. The interface was developed using previously established persona and evaluated by general users (i.e. not users with reading disabilities) in order to see if the interface was easy to use and to understand without tooltips and tutorials. The results showed that even though the participants understood the interface and found it intuitive, there was still some information they thought were missing, such as an explanation for the reading indexes and how they determined readability.
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Moore, Melody M. "User interface reengineering." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/12899.
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BARBOSA, SIMONE DINIZ JUNQUEIRA. "PROGRAMMING VIA INTERFACE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1999. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1814@1.
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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOA indústria de software vem ao longo dos anos aumentando a funcionalidade das aplicações, numa tentativa de satisfazer as necessidades do maior número de usuários possível. Esta solução, no entanto, implica grandes desafios de usabilidade, devido à complexidade cada vez maior destas aplicações. Uma tendência que visa a acomodar as necessidades dos usuários sem sobrecarregar o software com funcionalidade de uso infreqüente é permitir que os próprios usuários finais configurem ou programem as aplicações, através de mecanismos de extensão que suportam um tipo específico de programação, chamado programação feita por usuários finais. Entretanto, grande parte das técnicas existentes para tal não conseguem atingir níveis aceitáveis de utilidade e usabilidade. Este trabalho trata alguns desafios de aplicações extensíveis, propondo uma abordagem que rompe com algumas barreiras entre interface e extensão. Esta abordagem traz para a interface, e ao alcance dos usuários finais, mecanismos de extensão de software com base em recursos semântico-pragmáticos, utilizando cálculos de metáforas e metonímias. Estes mecanismos foram escolhidos devido ao reconhecimento das Ciências Cognitivas do papel que desempenham em nosso raciocínio, em especial quando tentamos descrever ou entender um conceito abstrato ou complexo (Lakoff e Johnson, 1980; Lakoff, 1987; Lakoff, 1993; Ortony, 1993). Descrevemos um modelo de aplicações extensíveis que utiliza uma base de conhecimento onde devem ser representados os elementos do domínio e da aplicação que podem ser estendidos, bem como as classificações necessárias aos mecanismos de extensão. Nosso modelo considera os aspectos comunicativos das aplicações computacionais. Para garantir a consistência entre a aplicação original e a aplicação estendida, seguimos princípios da Engenharia Semiótica (de Souza, 1993) e prevemos, no modelo, a representação de regras que restringem as extensões na interface, a fim de refletir adequadamente as extensões de funcionalidade.
In the past few years, we have witnessed an increase in software functionality as an attempt to meet most users` needs. This approach brings about serious usability challenges, due to an increase in application complexity as well. In order to try and meet users` needs, without overloading the application with functionality that is rarely used, there is a tendency to allow end users to configure or program applications, by means of mechanisms that support the so-called end user programming. However, many existing techniques fail to attain acceptable thresholds of usefulness and usability. This work addresses some of the challenges posed by extensible applications. We follow an approach that drops some walls between interface and extension. This approach brings some extension mechanisms to the interface, and readily accessible to end- users, namely extensions based on the semantic-pragmatic resources of metaphors and metonymies. These mechanisms were chosen due to the acknowledgment of the Cognitive Sciences of their critical role in our reasoning processes, especially when we try to describe or understand complex or abstract concepts (Lakoff e Johnson, 1980; Lakoff, 1987; Lakoff, 1993; Ortony, 1993). We describe an extensible application model that makes use of a knowledge base in which we represent the domain and application elements that may be extended, as well as the necessary classifications for calculating the possible extensions. Our model takes into account the communicative aspects of computer applications, and follows Semiotic Engineering (de Souza, 1993) principles to guarantee the consistency between the original application and the extended one. For that purpose, our model entails the representation of rules that constrain interface amendments, so that extended functionality is adequately reflected at the resulting interface.
La industria de software ha aumentado, a lo largo de los años, la funcionalidad de las aplicaciones, en un intento de satisfacer las necesidades del mayor número de usuarios posible. Esta solución, implica grandes desafíos de usabilidad, debido a la complejidad cada vez mayor de estas aplicaciones. Una tendencia que trata de acomodar las necesidades de los usuarios sin sobrecargar el software con funcionalidad de uso poco frecuente es permitir que los proprios usuarios finales configuren y programen las aplicaciones, a través de mecanismos de extensión que soportan un tipo específico de programación, llamado programación hecha por usuarios finales. Sin embargo, gran parte de las técnicas disponibles no consiguen alcanzar níveles aceptables de utilidad y usabilidad. Este trabajo trata algunos desafíos de aplicaciones extensibles, proponiendo un enfoque que rompe con algunas barreras entre interfaz y extensión. Este enfoque trae para la interfaz, y al alcance de los usuarios finales, mecanismos de extensión de software con base en recursos semántico-pragmáticos, utilizando cálculos de metáforas y metonímias. Estos mecanismos fueron escogidos debido al reconocimiento de las Ciencias Cognitivas del papel que desempeñan en nuestro raciocinio, en especial cuando tentamos describir o entender un concepto abstracto o complejo (Lakoff y Johnson, 1980; Lakoff, 1987; Lakoff, 1993; Ortony, 1993). Describimos un modelo de aplicaciones extensibles que utiliza una base de conocimiento donde deben ser representados los elementos del dominio y de la aplicación que pueden ser extendidos, bien como las clasificaciones necesarias a los mecanismos de extensión. Nuestro modelo considera los aspectos comunicativos de las aplicaciones computacionales. Para garantizar la consistencia entre la aplicación original y la aplicación extendida, seguimos los principios de la Ingeniería Semiótica (de Souza, 1993) y prevemos, en el modelo, la representación de reglas que limitan las extensiones en la interfaz, a fin de reflejar adecuadamente las extensiones de funcionalidad.
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Farquhar, Colin Pirie. "Interface electronic structure." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/14824.
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Mendes, Gilberto. "Interface gestual ultrassonica." [s.n.], 1999. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258829.
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Orientador : Furio DamianiDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Sirobaba, N. S., and D. O. Marchenko. "Brain-computer interface." Thesis, Вид-во СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/22533.
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A brain–computer interface (BCI), sometimes called a direct neural interface or a brain–machine interface (BMI), is a direct communication pathway between the brain and an external device. BCIs are often aimed at assisting, augmenting or repairing human cognitive or sensory-motor functions.
The field of BCI has advanced mostly toward neuroprosthetics applications that aim at restoring damaged hearing, sight and movement. Thanks to the remarkable cortical plasticity of the brain, signals from implanted prostheses can, after adaptation, be handled by the brain like natural sensor or effector channels. Following years of animal experimentation, the first neuroprosthetic devices implanted in humans appeared in the mid-nineties.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/22533
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Shliahetskiy, A. A. "Brain - computer interface." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46934.
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Brain -computer interface - the interface that implements the
connection between the human brain and the computer. The main idea is
that when you think about action and do it, the same part of the brain is
activated.In the middle of the XIX century, Emil Du Bois- Reymond
showed the relationship between electric current and nerve impulses; in
1875. Richard ketone managed to register the electrical activity of the brain
of animals. The psychiatrist Hans Berger in 1924 invented a method to
record the electrical activity of the human brain. In 1967, psychiatrist
Edmond Dewan published a paper in which he described
the experiment where a man was trying to send a message
to electroencephalogram by means of dot-and-dash,using brain
activity.One of the first practically implemented IMC is
considered a virtual keyboard made by Farwell and Donchyn which
was created in 1988.
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Lenay, Alice. "Interface-à-face." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALL024.
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Cette thèse de recherche-création explore et cherche à baliser les distances que structurent nos milieux de rencontre sur écrans, à partir de l’observation des visages qui s’y projettent. Dans le face-à-face en présentiel, je ne vois pas mon propre visage, mais je vois celui de l’autre qui, en me regardant, désigne cette part aveugle de mon corps. Faire face au visage, c'est constater un point de vue différent du mien, c’est donc ouvrir une distance qui permet la rencontre.Comment cette distance se trouve-t-elle restructurée lorsque nous nous faisons face par l’intermédiaire de caméras et d’écrans, aujourd’hui combinés sous la forme hybride de « camécrans » ? Quels milieux de rencontre notre face-à-face écranisé peut-il ouvrir ?Interface-à-face : le titre de la thèse vise à interroger la distance physique, spatiale, technique et sociale entre nos visages sur écran.L’enquête est menée sur un corpus de propositions artistiques récentes (1990-2020) mettant en scène différents modes de rencontres entre des visages par la médiation d’écrans. Elle se concentre sur les évolutions de trois artistes et collectifs dont les travaux sont particulièrement riches en la matière, que j’ai suivis et parfois accompagnés dans leur travail : Dominic Gagnon, Annie Abrahams et BeAnotherLab. Pour tester les hypothèses théoriques que je tire de l’analyse des œuvres du corpus, je propose des dispositifs artistiques que j’ai réalisés au cours des dernières années ou en cours de réalisation, et qui sont exposés sur un site internet associé.À travers ces dispositifs artistiques, l'écran devient un laboratoire d'observations et d'expériences de nos rencontres à distance, telles qu’elles se multiplient depuis une vingtaine d’années, au point de prendre désormais une place incontournable dans nos relations socialesThis research-creation dissertation explores and attempts to map out the distances that structure our meeting environments on screens, based on the observation of the faces appearing on them. In a face-to-face situation in presence, I do not see my own face, but I see the face of the other who, looking at me, points to this blind part of my body. I aknowledge an other point of vie on the world. To face the face then is to open a distance that allows the encounter. How is this distance restructured when we face each other through cameras and screens, now combined in the hybrid form of “camscreens”? What meeting environments can our screen-based face-to-face encounters open up? Interface-to-face: the title of this dissertation aims at questioning the physical, spatial, technical and social distances between our faces on screen.The investigation is carried out on a corpus of recent artistic propositions staging differ- ent modes of encounters between faces through the mediation of screens. It focuses more on the evolutions of three artists and collectives whose work is particularly rich on these issues, whom I have followed and accompanied in their work: Dominic Gagnon, Annie Abrahams and BeAnotherLab. Artistic installations that I have created over the past few years or that I am currently developing, exhibited on a site dedicated to the dissertation, are called upon to test the theoretical hypotheses drawn from the analysis of the works in the corpus, in order to shed light on our screen-based face-to-face encounters. Starting from asynchronous encounters (on YouTube) and ASMR videos (side A), the dissertation moves on to analyze synchronous encounters (using Zoom and Virtual Reality headsets) (side B). The trajectory as a whole proposes a path between different case studies so as to sketch a cartography of the possibilities and environments of encounters on screens.Through these artistic devices, the screen becomes a laboratory for observations and ex- periments on our remote encounters, as they have multiplied over the last twenty years, playing an increasing role in our social relations
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Almeida, Luís Filipe Martinho de. "Brain computer interface." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/21618.
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Mestrado em Engenharia Eletrónica e TelecomunicaçõesA investigação e desenvolvimento de sistemas BCI, Brain Computer Interface tem crescido de ano para ano, com resultados cada vez melhores. Uma das principais vertentes para a qual estes sistemas têm sido usados é na área da neuroprostética. Desta forma tem-se demonstrado em vários estudos e investiga ções a possibilidade de controlar membros completos ou parciais robóticos por nós seres humanos, dando assim uma liberdade e conquista de movimentos perdidos a pessoas incapacitadas. No entanto uma grande parte dos melhores resultados obtidos envolve a utilização de BCI invasivos, o que necessita de ser implantado diretamente no cérebro humano, através de uma operação cirúrgica. Isto é ainda um dos grandes inconvenientes que esta abordagem implica e também o facto de uma grande parte destes estudos ainda estarem na fase de testes. Este trabalho teve como objetivo tentar comprovar que os BCI não invasivos também conseguem obter bons resultados apesar das suas limitações e pior aquisição de resultados devido à inclusão de ruído por parte do nosso crânio e cabelo, assim como a inclusão dos Parâmetros Hjorth proporciona melhores resultados na identificação das classes desejadas. Dividiu-se o trabalho em duas partes, uma para a identificação das classes de “Piscar de Olho” e outra para identificação das classes de “Ações Pensadas” . Os resultados foram todos obtidos tendo em conta apenas um utilizador. Relativamente à deteção do “Piscar de Olho” comprovou-se que ́e facilmente conseguido com resultados quase perfeitos, com uma precisção de 99 . 98%. Relativamente à deteção de “Ações Pensadas” não foi possível comprovar a sua deteçãao usando sessções de gravação diferentes, no entanto verificou-se que a classificação das classes tendo em conta a mesma sessão de gravação, obtém resultados muito bons com valores acima dos 99% para o melhor m ́etodo preditivo. A inclusão dos Parâmetros Hjorth foi em todos os casos de estudo, a opção em que os resultados foram sempre melhores, demonstrando assim que a inclusão dos mesmos é uma opção aconselhável, pois em alguns casos, a precisão na deteção das classes aumento para duas ou mais vezes. Os resultados são promissores e apesar de não ter conseguido obter os melhores resultados para sessões de gravação independentes na classificação de “Ações Pensadas” , indico nas análises os passos necessáios para a obtenção de melhores resultados e a possibilidade de generalização do processo para diversos utilizadores.
The research and development of BCI systems, Brain Computer Interface has grown from year to year, with better and better results. One of the main areas for which these systems have been used is the neuroprosthetic. Several studies and investigations have shown the possibility of controlling complete or partial robotic members by people, thus giving a freedom and conquest of lost movements to incapacitated persons. However, a great part of the best results obtained involves the use of invasive BCI, which needs to be implanted directly into the human brain through a sirurgical operation. This is still one of the great drawbacks that this approach entails and also the fact that a large part of these studies are still in the testing phase. The aim of this study was to try and prove that non-invasive BCI can also achieve good results despite their limitations and inferior quality on the acquisition of data due to the inclusion of noise from our skull and hair, and also that the inclusion of the Hjorth Parameters on the analysis provides better results in identifying the desired classes. The work was split into two parts, one for the identification of “Eye Blinking” classes and the other for “Thought Actions” classes. The results were all obtained with only one user in mind. Regarding the detection of “Eye Blinking” it has been found that it is easily achieved with near-perfect results, with an accuracy of 99 . 98%. Regarding the detection of “Thought Actions” it was not possible to verify its detection using different recording sessions, however it was verified that the classification of classes taking into account the same recording session, obtains very good results with values above 99% for the best predictive method. The inclusion of Hjorth Parameters was in all study cases, the option in which the results were always better, thus demonstrating that their inclusion is an advisable option, since in some cases, the accuracy in detecting classes doubled or more. The results are promising and although I haven’t been able to obtain the best results for independent recording sessions in the classification of “Thought actions” , I indicate in the analysis some steps necessary to obtain better results and the possibility of generalizing the process for several users.
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Dillon, Andrew. "User interface design." London: Macmillan, 2003. http://hdl.handle.net/10150/105299.
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This item is not the definitive copy. Please use the following citation when referencing this material: Dillon, A. (2003) User Interface Design. MacMillan Encyclopedia of Cognitive Science, Vol. 4, London:MacMillan, 453-458. Article definition: This article covers the basic issues that the field of cognitive science raises in the design and testing of new digital technologies for human use. Contents list: Introduction, Cognitive Science and design, The Basics of Human-Computer Interaction, Cognitive Design Guidelines: from psychophysics to semiotics, Beyond guidelines Cognitive theories and models in HCI, Developing user-centered design methods, Summary, Bibliography, Glossary
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Prado, Renato Silva de Almeida. "Arquitetura de interface: análise de formas de organização da informação na interação entre pessoas e códigos." Pontifícia Universidade Católica de São Paulo, 2006. https://tede2.pucsp.br/handle/handle/4804.
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Previous issue date: 2006-08-04Two important facts are observed in the communicational processes in the last two decades. The first one is the mass use of the computers on a global scale digital support and the second one is the connection between them the net. Both facts were accompanied by significant changes in the interface between man and machine. The wide spread of the computer had its beginning connected with the adoption of the graphic interface rather than the command-line interface and also the assimilation of the mouse. The growth of the net internet also was influenced by an interface change, when Mosaic appeared in 1993. The early internet, basically formed by textual information starts to work in a multimedia way, with sound and image along with the text. This project intends to analyze the unfolding of these two facts, by means of reading and analysis of some aspects of the digital culture and net culture, as well as to raise concepts and characteristics pertinent to these contexts for the development of new interfaces that can represent a new step or progress in an interaction form. More than ten years have passed and the signs of these changes are more and more evident and intricate in our social and cultural daily life. The discussion about the needs for new interfaces is already significant as Steven Johnson, Richard Grusin, Jay David Bolter, Lev Manovich, Giselle Beiguelman and Peter Weibel put it. This work is based greatly, besides the authors above, in the points of view of Alexander Galloway and Howard Rheingold. The relevance of this study is more evident as the digital interfaces are more and more present in so many social layers and activities, but now they have their capacity questioned. Today s graphic interface still has some of their characteristics attributed in the 70 s, and developed to work basically with a quantity of information restricted to one computer. At the same time it accesses and manipulates a much bigger quantity of information, come from and distributed to billions of computers
Dois importantes acontecimentos são observados nos processos comunicacionais das duas últimas décadas. O primeiro é o uso massificado dos computadores em escala mundial suporte digital e o segundo é a conexão entre eles a rede. Ambos os fatos foram acompanhados de significativas mudanças na interface entre o homem e a máquina. A difusão do computador teve início, em grande parte, pela adoção de uma interface gráfica em detrimento da linha de comando e pela incorporação do mouse. O crescimento da rede internet deu-se, também em grande parte, através de uma mudança de interface, com o surgimento do Mosaic em 1993. Antes basicamente constituída de informação textual, a internet passa a trabalhar de forma multimídia, com textos, sons e imagens. Este trabalho tem como objetivo analisar desdobramentos destes dois importantes acontecimentos, por meio da leitura e análise de alguns aspectos da cultura digital e da cultura de rede, e levantar características e conceitos pertinentes a estes contextos para o desenvolvimento de novas interfaces que possam representar um novo salto ou progresso na forma de interação. Mais de dez anos se passaram e os sinais destas mudanças são cada vez maiores e cada vez mais imbricados com o cotidiano social e cultural. A discussão sobre a necessidade de novas interfaces já é significativa, como colocam Steven Johnson, Richard Grusin, Jay David Bolter, Lev Manovich, Giselle Beiguelman e Peter Weibel. O trabalho está fundamentado em grande parte, além dos autores acima citados, nos pontos de vista de Alexander Galloway e Howard Rheingold. A relevância deste estudo se dá na medida em que as interfaces digitais encontram-se cada vez mais presentes em diversas camadas e atividades sociais, mas que, hoje, tem sua capacidade colocada em questionamento. Com características atribuídas na década de 1970, e desenvolvidas para, a priori, trabalhar com uma quantidade de informação restrita a apenas um computador, a interface gráfica, atualmente, acessa e manipula uma quantidade de informação muito maior, distribuída e provinda de bilhões de computadores
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Eliasson, Simon. "Comparing Compressor Interface Designs : How do visual displays on digital compressors impact how audio engineers navigate an interface and the choices they make?" Thesis, Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-74857.
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This research tested to see how audio engineers navigate and use compressors differently with alternative designs. A pre-study in the form of a semi-structured interview with a focus group was held to determine a compressor considered having a “good design” and a compressor considered having a “bad design”. An active test was conducted with audio engineer students to investigate if there is any connection between time it takes for an engineer to navigate a compressor depending on its design. The test also investigated patterns in how audio engineers use compressors differently depending on their design, and what makes it easier to navigate and more satisfactory to use. 6 paired T-test were made between different compressor designs and a video and screen capture was annotated to investigate how audio engineers navigated the compressor. The results showed that 2 out of 6 T-tests gave a significant result, meaning that the time it took to navigate some of the compressors against each other were affected by the design of the compressor interface. Results showed that there are many contributing factor towards why a compressors is easier navigate and more satisfactory to use, but with a slight tendency that “parameter controls”, “visual information” and “aesthetically pleasing” are the most important factors. No findings on how engineers might use compressors differently depending on its design were found. Some additional patterns for audio engineers using compressors were found as well.
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Persson, Emmeli, and Helen Sjelvgren. "Graphical Corporate Interface. A concept for semi-produced Graphical User Interfaces for corporations." Thesis, Blekinge Tekniska Högskola, Avdelningen för för interaktion och systemdesign, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3000.
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Abstract The objective of this bachelor’s project is to investigate how to reuse the graphical- and technical aspects of a user interface, and to develop a concept for a semi-produced GUI. When giving shape to a user interface the aim is to make it usable for the end user, so naturally that is part of the work as well. There are a lot of innovative and interesting techniques in the web based GUI domain and some of them are suitable when the aim is to make a GUI which is both reusable and a corporate structure. Two stages exist in the semi-produced GUI concept. The first stage is to investigate and develop the semi-produced. The second stage is to use the semi-produced GUI and prepare a specific GUI for the end user. The whole concept will require some extra effort to begin with. There has to be an enquiry into which functions in the GUI are likely to be reused. The architecture has to be planned to be reusable and be well documented. In the GUI development there are several roles involved and all of them will be affected by the reuse idea. The core in the semi-produced concept is a component-based architecture, a well-prepared reference GUI, GUI- documentation and guidelines.
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Li, Zhilin. "The immersed interface method : a numerical approach for partial differential equations with interfaces /." Thesis, Connect to this title online; UW restricted, 1994. http://hdl.handle.net/1773/6761.
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Timounay, Yousra. "Rhéologie d'interface liquide/air chargées de grains : vers la consolidation d'un milieu aéré." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1156/document.
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Les mousses liquides sont dans un état métastable. Un moyen de les stabiliser est d’y incorporer des particules solides. Lorsqu’elles sont hydrophobes, ces particules s’attachent aux interfaces liquide-air de la mousse et changent radicalement la rhéologie des films séparant les bulles. L’objectif de cette thèse est d’étudier expérimentalement deux composants élémentaires des mousses chargées en particules, à savoir les films et les bulles. La rhéologie des films particulaires est sondée grâce à des expériences d’éclatement et de compression alors que la résistance des bulles armurées est étudiée en faisant varier leur pression interne. En utilisant l’imagerie rapide, nous montrons d’abord que les particules qui pontent les deux interfaces du film peuvent inhiber l’ouverture d’un trou et que pour les autres configurations, la dynamique de rétraction peut être décrite par un équilibre inertio-capillaire pour des fractions surfaciques en particules <0.6 environ. L’étude de la dynamique de rétraction des films particulaires par Particle Image Velocimetry a permis de les caractériser par une viscosité effective qui diverge à la transition de jamming. De plus, les films particulaires flambent à fraction surfacique en particules élevée indiquant une transition d’un comportement liquide vers un comportement solide. En ce qui concerne les bulles particulaires, nous avons montré l’existence de pressions critiques 10 fois plus grandes que la pression de Laplace avant que les bulles ne se déforment aussi bien en dépression qu’en surpression ; la tension effective dans le plan de la coque granulaire est donc 10 fois plus importante que la tension dans un film liquide. Une fracture, correspondant à l’étirement du film liquide, est par ailleurs observée sur les bulles particulaires en surpression. En adoptant une approche élastique, le critère de Griffith permet de retrouver le bon ordre de grandeur de la pression de fractureLiquid foams are in a metastable state. One way to stabilize them is incorporating solid particles. When hydrophobic, these particles attach to liquid-air interfaces of the particle-laden foam inducing a drastic change in the rheology of the films between bubbles. The aim of this thesis is to study experimentally two elementary components of particle-laden foams, namely soap films and bubbles. The rheology of particulate films is probed through bursting and compression experiments while the resistance of armored bubbles is studied by inner pressure variations. Using high speed photography, we first show that particles bridging both liquid-air interfaces of a liquid film can resist hole opening and that the retraction dynamics for the other configurations can be described by a balance between inertia and capillarity for surface fractions of particles <0.6 approximately. Then studying the retraction dynamics of particulate soap films by Particle Image Velocimetry, we characterized these systems by an effective viscosity that diverges at the jamming transition. Moreover, buckling is observed at high surface fraction of particles indicating a transition from liquid-like to solid-like behavior. Concerning particulate bubbles, we showed the existence of pressure thresholds 10 times greater than Laplace pressure that need to be exceeded in order to observe a deformation in depression and overpressure experiments; the effective tension in the granular shell is thus 10 times greater that the tension in a liquid film. When inflated, a fracture corresponding to the stretching of the liquid film appears on particulate bubbles. Through an elastic approach, Griffith’s criterion gives the right order of magnitude of fracture pressures
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Gong, Yan. "Immersed-Interface Finite-Element Methods for Elliptic and Elasticity Interface Problems." NCSU, 2007. http://www.lib.ncsu.edu/theses/available/etd-07222007-232136/.
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The purpose of the research has been to develop a class of new finite-element methods, called immersed-interface finite-element methods, to solve elliptic and elasticity interface problems with homogeneous and non-homogeneous jump conditions. Simple non-body-fitted meshes are used. Single functions that satisfy the same non-homogeneous jump conditions are constructed using a level-set representation of the interface. With such functions, the discontinuities across the interface in the solution and flux are removed; and equivalent elliptic and elasticity interface problems with homogeneous jump conditions are formulated. Special finite-element basis functions are constructed for nodal points near the interface to satisfy the homogeneous jump conditions. Error analysis and numerical tests are presented to demonstrate that such methods have an optimal convergence rate. These methods are designed as an efficient component of the finite-element level-set methodology for fast simulation of interface dynamics that does not require re-meshing. Such simulation has been a powerful numerical approach in understanding material properties, biological processes, and many other important phenomena in science and engineering.
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Ye, Chang. "Automatic Battery Interface-based Energy Modeling for Wireless Interface on Smartphones." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429643861.
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Cavalcanti, Calazans Dennis. "Meta-Interface como elemento mediador da acessibilidade no design de interface." Universidade Federal de Pernambuco, 2010. https://repositorio.ufpe.br/handle/123456789/2984.
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O objetivo do presente trabalho é tornar interfaces computacionais mais acessíveis aos usuários deficientes através da concepção de uma meta-interface que corrija falhas de usabilidade encontradas, neste trabalho especificamente, na web. Para isto, faz-se uma explanação do atual contexto dos avanços tecnológicos e da situação dos usuários portadores de deficiências no que tange o acesso a interfaces digitais e a recursos de acessibilidade. Existem diversas falhas de usabilidade e arquitetura de informação que dificultam o uso desses recursos por esses usuários, resultando muitas vezes na não utilização de ferramentas de acessibilidade. Com o intuito de facilitar o acesso dos usuários portadores de deficiência a ambientes digitais, será apresentada, através de um embasamento teórico dos principais conceitos abordados, uma proposta de meta-interface capaz de corrigir falhas de websites, tornando o uso mais agradável e eficaz pelo usuário em questão, através da aplicação de uma ferramenta que modifique automaticamente os websites acessados pelos usuários de internet
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Gonzalez, Franck. "Contributions au développement d'une interface haptique à contacts intermittents." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066068/document.
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Les interfaces haptiques permettent à un opérateur d'interagir avec un environnement virtuel ou distant via le sens du toucher.La majorité des interfaces de l'état de l'art restent au contact de l’utilisateur pendant toute la durée de la manipulation. La liaison permanente entre le robot et l’opérateur nuit à la qualité de l’interaction, notamment en réduisant la transparence en espace libre. Ce problème est d’autant plus prégnant dans le cadre des interfaces haptiques dextres.Cette thèse a pour objectif d'étudier la possibilité d'augmenter la transparence et le réalisme de l'interaction à travers le développement d’interfaces à contacts intermittents. Il s’agit de déconnecter le robot de l'utilisateur lorsqu’aucun contact avec l’environnement n’est nécessaire. Un état de l’art des performances de la manipulation humaine, des interfaces haptiques dextres ainsi que des travaux relatifs au contact intermittent, est d’abord présenté. Un effecteur plan pour le contact intermittent est ensuite conçu. Il est installé à l’extrémité distale d'une interface haptique et plusieurs solutions sont envisagées pour sa loi de commande. Les performances de dix utilisateurs sont comparées dans le cadre d'une tâche de détection de contact en utilisant d'une part l'effecteur adapté au contact intermittent, d'autre part une interface haptique classique. L'élaboration d'une interface permettant une interaction plus naturelle avec l'environnement est ensuite initiée par l'élaboration d'une méthodologie de choix des zones de contact de la main à prendre en compte dans la conception d'une interface haptique. Des perspectives sont finalement données quant à l'extension de ces résultats à une interface haptique dextre à contacts intermittentsHaptic interfaces allow an operator to interact with a virtual environment through the sense of touch. Nowadays, most existing interfaces are mechanically connected to the user's hand throughout the simulation. Therefore he or she interacts with the virtual environment by means of a handle. Thus the interaction is neither natural nor intuitive, and the permanent connection between the robot and the operator is the source of perturbations which prevent the interaction from being perfectly transparent and realistic. The goal of this study is to increase transparency as much as possible by disconnecting the robot from the user when s/he is not in contact with the virtual environment, through the design of a dexterous haptic interface allowing for a more natural interaction than with a classical interface taking into account only one contact point. A state-of-the-art of dexterous haptic interfaces and another for intermittent contact devices are first gathered, and the human performances that should be taken into account for the design of a dexterous haptic interface are analysed. A bidirectional end-effector for intermittent contact is then devised. It is set up at the tip of a haptic interface and several solutions are tested for its control. The performances of six users are compared on the context of a contact detection task, first using the intermittent contact end-effector, then using a classical haptic device. A methodology for the choice of the hand contact areas that should be taken into account in the design of a dexterous haptic interface to enhance the naturalness of the interaction is proposed. Finally, some perspectives are given as for the extension of this study for the design of a dexterous encounter-type haptic interface
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Reinhard, Nancy A. "The effect of task complexity on user interfaces : a comparison of command language interface and direct manipulation interfaces." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/26514.
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Guntupalli, Ravi Chandra Chaitanya. "User interface design : methods and qualities of a good user interface design." Thesis, University West, Department of Economics and IT, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-449.
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User interface (UI) plays a vital role in software. In terms of visibility, its design and precision holds the primary importance for depicting the exact amount of information for the intended user. Every minor decision taken for the designing of UI can contribute to the software both positively and negatively. Therefore, our study is intended to highlight the strategies that are currently being used for successfully designing UIs, and make appropriate suggestions for betterment of UI designs based on case studies and research findings.
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Schaubeck, Stefan [Verfasser], and Helmut [Akademischer Betreuer] Abels. "Sharp interface limits for diffuse interface models / Stefan Schaubeck. Betreuer: Helmut Abels." Regensburg : Universitätsbibliothek Regensburg, 2013. http://d-nb.info/1047236966/34.
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Akinci, Nadir [Verfasser], and Matthias [Akademischer Betreuer] Teschner. "Interface handling in smoothed particle hydrodynamics = Interface-Handhabung in Smoothed Particle Hydrodynamics." Freiburg : Universität, 2014. http://d-nb.info/1114829331/34.
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Shabani, Shahpar. "Pure Java interface to a DSMS : Pure Java interface to a DSMS." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423975.
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SCSQ (Scalable Stream Query processor) is a data stream management system (DSMS) that allows different kinds of distributed high-volume infinite streams to be queried. The current Java interface to SCSQ usesC libraries to communicate between Java and a SCSQ server. Therefore, a pure Java client-server interface to SCSQ is needed. Unlike regular databases, DSMS can process queries over infinite streams. Such continuous queries (CQs) are running until they are explicitlyterminated. The interface must be able to process infinite scans of continuous query results. This master thesis implements a pure Java client-server interface to SCSQ which can handle CQs.
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Wiegmann, Andreas. "The explicit jump immersed interface method and interface problems for differential equations /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/5774.
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Tran, Phuoc Nguyen. "Modèles de sélection d'interface et d'association flux/interface pour les terminaux mobiles multi-interfaces." Phd thesis, Télécom ParisTech, 2010. http://pastel.archives-ouvertes.fr/pastel-00564095.
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La diversité des technologies d'accès radio (e.g., GPRS, UMTS, HSDPA, Wi-Fi, WiMAX, LTE ...), leur complémentarité en termes de couverture, des caractéristiques (e.g., la bande passante, QoS) et des possibilités commerciales pour les opérateurs conduisent au développement des terminaux mobiles intégrant simultanément plusieurs interfaces radio. La capacité des terminaux mobiles utilisant simultanément différentes interfaces offre de nombreux avantages intéressants, tels que l'accès permanent et omniprésent, la fiabilité, le partage de charge, l'agrégation de bande passante disponible et la sélection d'interface basée sur plusieurs critères, etc. Les terminaux mobiles avec plusieurs interfaces radio ont la possibilité de choisir la "meilleure" interface en fonction de plusieurs paramètres tels que les caractéristiques des applications, les préférences des utilisateurs, les caractéristiques du réseau, les politiques d'opérateur et les contraintes tarifaires, etc. Il devient également possible d'associer les applications aux différentes interfaces de réseau basant sur les exigences d'application. Dans cette thèse, nous abordons le problème de sélection d'interface où un terminal mobile équipé de plusieurs interfaces peut sélectionner à tout moment la meilleure interface ou la meilleure technologie d'accès selon plusieurs critères. Nous considérons le problème de décision pour la sélection d'interface. Le problème de décision est un problème très complexe. On peut avoir les différent approches pour la section d'interface (e.g., fonction de coût, fonction d'utilité, ou la politique). Chaque approche est considérée comme un angle d'attaque. Nous nous intéressons l'approche MADM qui est une approche prometteuse pour la décision avec plusieurs attributs. Nous investiguons ces méthodes dans le contexte de la sélection d'interface. L'objectif fondamental des méthodes MADM est de déterminer la solution optimale parmi plusieurs solutions. MADM comprend de nombreuses méthodes, comme SAW (Simple Additive Weighting), WP (Weighting Product) et TOPSIS (Technique for Order Preference by Similarity to Ideal Solution). Le premier objectif de ma thèse est d'étudier et d'analyser les méthodes de MADM pour le problème de sélection d'interface. La première contribution est de proposer une étude de simulation qui met en évidence des limites des méthodes de MADM dans le contexte de la sélection d'interface. Par exemple, TOPSIS a le problème "d'anomalie de classement". Ce problème se produit lorsqu'une interface à faible classement est retirée de la liste du candidat (e.g., un réseau est déconnecté), l'ordre de classement des interfaces changera anormalement. La deuxième contribution propose l'algorithme de DiA (Distance to the ideal Alternative) qui permet au terminal mobile de sélectionner dynamiquement la meilleure interface. Nous montrons que DiA n'a pas le problème "d'anomalie de classement" qui est le défaut de la méthode TOPSIS. Les résultats de simulation valident l'algorithme de DiA. La troisième contribution s'attaque au problème d'association flux/interface où un terminal mobile équipé de plusieurs interfaces doit associer une application à l'interface spécifique appropriée. Nous proposons tout d'abord une fonction d'utilité interface. Cette fonction d'utilité permet d'identifier l'interface qui satisfait des besoins d'application et économise la consommation d'énergie du terminal mobile. Nous proposons ensuite un premier modèle d'association flux/interface qui permet d'associer séquentiellement des applications aux interfaces. Les attributs de réseau tels que le délai d'accès et le coût monétaire sont également pris en compte dans le régime. L'algorithme de DiA est utilisé pour classer les interfaces basées sur les valeurs d'utilité interface et les attributs de réseau. Les résultats de simulation sont présentés pour valider le schéma proposé. De plus, nous proposons un deuxième modèle d'association flux/interface. Dans ce modèle, un terminal peut associer simultanément plusieurs applications aux interfaces de réseau. Le modèle vise à maximise l'utilité globale du terminal. Ce problème est un problème d'optimisation. En particulaire, il est lié aux problèmes d'optimisation heuristique stochastique (i.e., méta-heuristique) qui sont principalement basées sur les techniques de recherche dont les solutions et l'ordre de recherche basent sur les procédures aléatoires. En première étape, nous étudions et réalisons une étude de simulation des méthodes d'optimisation heuristique stochastique, e.g., la recherche locale, la recherche de Tabou, la méthode de recuit simulée. Nous proposons ensuite une technique de diversification orientée pour la recherche Tabou comme une amélioration. Cela permet à la recherche Tabou d'éviter de se retrouve piégée plusieurs fois dans l'optimum local et d'augmenter les performances de la recherche Tabou dans notre contexte. Les résultats de simulation montrent que la méthode modifiée a meilleure performance comparée avec les autres algorithmes méta-heuristique dans notre contexte. Nous nous dirigeons ensuite vers une approche au niveau de réseau pour le problème d'association flux/interface. Nous considérons un système des terminaux mobiles multi-interface. Chaque terminal peut associer des applications aux interfaces. Comme plusieurs terminaux en concurrence pour les ressources de réseau commun, le système est modélisé comme un jeu stratégique. Notre objectif est de trouver des stratégies d'équilibre de Nash pour le jeu. Nous avons laissé le jeu évoluer en fonction de la dynamique de Replicateur et observons si le système converge et si les points stationnaires sont des équilibres de Nash. Nous montrons que la dynamique de Replicateur est positivement corrélée et le système est un jeu potentiel. Notre système converge vers des points stationnaires qui comprennent tous les équilibres de Nash. En outre, les points stationnaires sont efficaces car ils optimisent l'utilité du système. Un point intéressant est que nos résultats sont validés pour une fonction d'utilité générale qui dépend de l'état du système. Pour valider notre modèle et démontrer que le système converge vers des équilibres de Nash, nous mettons en œuvre les scénarios de simulation en utilisant un algorithme d'apprentissage Nash avec un schéma d'allocation de bande passante spécifique ainsi que d'une fonction d'utilité qui prend en compte le niveau de satisfaction d'application et la consommation d'énergie.
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Xu, Ming. "Photoluminescence Techniques for the Characterization of Photovoltaic Interfaces." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS053/document.
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Dans ce travail, nous avons appliqué des techniques de photoluminescence en régime stationnaire (PL) et photoluminescence en régime modulé (MPL) à l'étude d'hétérojonctions formées entre du silicium cristallin (c-Si) et du silicium amorphe hydrogéné (a-Si:H). Plus précisément, nous avons comparé des échantillons constitués de dépôts de (n)a-Si:H, (i)a-Si:H, (n)a-Si:H/(i)a-Si:H, et (p)a-Si:H/(i)a-Si:H sur des wafers de (n) c-Si de haute qualité électronique. Les mesures en fonction de la température montrent que la durée de vie des porteurs en excès diminue lorsque la température diminue, ce qui peut être qualitativement reproduit par la simulation dans un mécanisme de recombinaison de type Shokley-Read-Hall (SRH) en tenant compte du niveau d’énergie du dopant (phosphore) dans le substrat et de niveaux peu profonds électroniquement actifs à l'interface.Nous avons également étudié des échantillons dopés par implantation d'ions puis passivés par AlOx, a-Si:H et SiC. Des signatures de dislocations sont révélées à basse température par des pics supplémentaires de PL.Nous avons également comparé les résultats de cartographies de PL et de durée de vie obtenues par l'analyse de l'amplitude de MPL, et par l'analyse de son déphasage. Il est constaté que les propriétés optiques des échantillons ont un grand impact sur la cartographie PL, ce qui pourrait conduire à une conclusion erronée sur leur homogénéité. En revanche, les cartographies de durée de vie sont moins sujettes à des variations de paramètres optiques et au bruit provenant du processus de mesure, phénomènes qui ne sont pas intrinsèques à l'échantillon étudié.La nature différentielle de la mesure MPL est étudiée. Nous démontrons la notion de durée de vie à l'état stationnaire et de durée de vie différentielle. Nous analysons différents types de recombinaisons avec la durée de vie MPL et avons mis en œuvre des simulations des hétérojonctions a-Si:H/c-Si. Nous constatons que dans le domaine d'excitation intéressant pour le photovoltaïque, la durée de vie différentielle est souvent inférieure à la durée de vie à l'état stationnaire. Nous faisons aussi des comparaisons entre les durées de vie obtenues par mesures dites QSSPC et MPL et montrons qu'elles sont en fait égales.La combinaison des techniques de PL et de MPL nous a permis d'étudier le coefficient de recombinaison radiative en fonction de la température. Les résultats publiés jusqu'ici dans la littérature couvrent la plage de température de 300 K à 90 K. Dans cette plage, nos résultats sont en très bon accord avec ces résultats publiés précédemment. Mais, grâce à notre système de mesure et à la combinaison PL/MPL, nous avons obtenu des valeurs de ce coefficient jusqu’à 20 K et nous avons pu proposer une fonction polynômiale du cinquième degré qui permet de bien reproduire les variations en fonction de la température sur toute la plage de 20 K à 300 K.Dans une dernière partie de la thèse, les propriétés de transport de porteurs et l'effet de couplages sont étudiés dans des empilements de quantum dots. Nous avons examiné les quantum dots de InAs qui croissent de manière ordonnée en formant des chaînes à partir d'une couche tampon en InGaAs (couche dite de "cross hatch pattern"). Nous avons caractérisé par PL des monocouches ainsi que des multicouches empilées de chaînes de quantum dots. L'effet de couplage entre dots dans le plan est observé sur des échantillons de monocouches, et nous remarquons une inhibition du couplage vertical entre couches qui est expliqué par l'effet du champ de déformation de la couche de cross hatch patternSilicon solar cells remain the driving technology and dominate the photovoltaics market. Hydrogenated amorphous silicon/crystalline silicon (a-Si:H/c-Si) heterojunction cells achieve the best efficiency in silicon cells to date (25.6%). A great part of this achievement is assigned to the improvement of the passivation of the emitter/absorber interface. In that regard, luminescence techniques whether Photoluminescence (PL) or Modulated photoluminescence (MPL), are particularly appropriate to investigate surface defects and effective carrier lifetime.In this work, we developed a PL/MPL setup coupled to a helium cooled cryostat to the study of a-Si:H/c-Si heterojunctions. Considering the modulated nature of the MPL, we introduced the concept of steady state lifetime and differential lifetime. Through simulations, we analyzed different types of recombination mechanisms and found that the differential lifetime is lower than the steady state lifetime. We also benchmarked the lifetime determined by photoconductance decay measurements and the MPL lifetime and demonstrated that they are actually equal.We have analyzed various samples of a-Si:H/c-Si heterojunctions from multiple sources, particularly within the framework of the European project HERCULES (High Efficiency Rear Contact solar cells and Ultra powerful moduLES). The samples are composed of various doping and passivation layers such as AlOx, a-Si:H and a-SiC:H fabricated on high quality (n)c-Si wafers. The temperature dependent measurements show that the excess carrier lifetime decreases when temperature decreases, which is explained by the Shockley-Read-Hall recombination model at the heterojunction interface. The combination of PL and MPL measurements have enabled us to determine the radiative recombination coefficient in crystal silicon as a function of temperature. Our measurements have extended the original data to 20 K. We propose a fifth order polynomial of the radiative recombination coefficient as a function of temperature in the range of 20 to 300 K and it agrees very well to others’ work.We also investigated the possibility to extend the system to carry out PL and MPL mapping in order to extract the cell homogeneity and the lifetime distribution across the sample. We found that the optical property of sample has a significant impact on the PL mapping and could lead to incorrect conclusion with respect to the homogeneity. However the lifetime mapping from MPL produces imaging that is less prone to variation of optical properties.At last, we utilized the temperature dependent micro PL to investigate the coupling of InAs quantum dot chains (QDC) stacks grown on InGaAs cross hatch patterns separated with a 10 nm GaAs layer. The PL spectra are dominated by the top-most stack, indicating that the QDC layers are nominally uncoupled. However, under the high excitation power densities achievable with the micro PL system, when the high-energy peaks of the top stack are saturated, low-energy PL peaks from the bottom stacks emerge as a result of the carrier transfer across the GaAs spacers. These unique PL signatures contrast with the state-filling effects in conventional, coupled QD stacks and serve as a means to quickly assess the presence of electronic coupling in stacks of dissimilar-sized nanostructures
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Borkowski, Stanislaw. "Steerable interfaces for interactive environments." Grenoble INPG, 2006. https://tel.archives-ouvertes.fr/tel-00084658.
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La mobilité est une caractéristique fondamentale pour l'informatique moderne. Cette thèse étudie un nouveau type d'interfaces mobiles capables d'être déplacées dans l'environnement à l'aide de système informatique. On les nomme interfaces pilotables. Dans ce travail de recherche, nous présentons un prototype d'interface pilotable. Nous présentons un ensemble d'applications possibles avec ce type d'interfaces, et avons approfondi l'un d'elle en explorant l'effet d'une interface pilotable avec des utilisateurs coprésents dans le cadre du travail collaboratif. Un ensemble motorisé composé d'un vidéoprojecteur couplé à une camera permet d'afficher des images numériques sur presque toutes les surfaces disponibles dans notre salle d'expérimentation. Pour compenser les distorsions projectives, nous proposons deux méthodes: de rectification dynamique d'images : (a) basée sur la détection des bords de la surface d'affichage, et (b) basée sur un modèle du projecteur. Nous utilisons l'algorithme de détection de bords pour créer une surface portable d'affichage à partir d'une pièce de carton. Nous utilisons également la vision par ordinateur pour rendre interactif les images projetées. Une implémentation de widgets élémentaires comme des boutons ou des ascenseurs sont présentés. Nous proposons plusieurs techniques d'interaction pour contrôler la position de l'interface. Les techniques sont analysées en utilisant le modèle de couplage de ressources d'interaction. Cette thèse se conclut par une étude d'utilisation de notre système, dans le but de comparer les modalités fixes, portables et pilotables dans le cadre d'un travail collaboratifMobility is a fundamental feature of modern information technology. Ln this thesis, we investigate the use of a new class of mobile interfaces that can be moved by the computer system within the environment. We cali them steerable interfaces. We create a prototype steerable interface, explore potential applications for this class of interfaces, and evaluate the impact of interface mobility in the context 01 collocated collaborative work. A Steerable Camera-projector pair, built for this study, allows us to display digital images on almost any surface in our laboratory. To copy with image distortions resulting trom projection on surfaces at arbitrary angles, we propose two methods for dynamic image rectification; (a) based on detection of screen boundaries, and (b) based on a pinhole projector model. We use the screen boundaries detection algorithm to create a lightweight Portable Display Surface out of a handheld piece of cardboard. We use computer vision to render projected images interactive. We propose a computer vision based implementation of basic interactive widgets that is robust to changes in lighting conditions. The steerable projector together with the Portable Display Surface allows us to experiment with projection-based mobile interfaces. We propose a number of interaction techniques for controlling the location of a steerable interface, and analyse them using an adaptation of the "coupling" model. Finally, we perform a user study comparing immobile, portable and steerable interfaces in the context of colocated collaborative work. The results of the study show that users enjoy working with both portable and steerable interfaces