248 research outputs found
Social virtual reality (VR) applications and user experiences
No full textVirtual reality (VR) is the experience in a simulated interactive virtual space. It provides synthetic sensory feedback to users' actions that can physically and mentally immerse the users. Social VR is one type of VR system that allows multiple users to join a collaborative virtual environment and communicate with each other, usually by means of visual and audio cues. The virtual space can be a computer-generated 3D scene or a 360° scene captured by an omnidirectional camera. Each user is represented as a computer-generated avatar or using a virtual representation based on live capture. Social VR has shown to be a promising solution to enrich remote communication experiences in the face of increasing pressures to reduce travel and work remotely. In this chapter, we will showcase the design, implementation, and real-world deployment of a series of social VR applications, which are developed for immersive interactive communication and collaboration for multiple domains (e.g., healthcare, cultural heritage). Moreover, we discuss the experimental protocols for evaluating user experiences in this new medium.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Multimedia Computin
Comparacion entre el diseño plastico y el diseño elastico en un edificio de concreto reforzado a base de marcos continuos
No full textIdentificación de factores de éxito en las fases de alineación y formulación del Sistema Interconectado Nacional
No full textLa presente investigación tiene como propósito principal contribuir con el aprovechamiento de la energía solar fotovoltaica en Colombia, a través de la implementación de proyectos fotovoltaicos en el Sistema Interconectado Nacional.
Para ello se establecen cinco fases: a. Marco teórico donde se citan los significados de los términos energía fotovoltaica, factor de éxito, alineación y formulación; b. Estado del arte de proyectos fotovoltaicos en Colombia en sus fases de alineación y formulación, allí se citan los factores claves que ya han sido avalados en investigaciones anteriores para una correcta alineación y formulación de proyectos fotovoltaicos; c. Recopilación de la información del entorno colombiano en esos mismos ámbitos a través de la aplicación de entrevistas y encuestas; d. Análisis de la información recopilada en las dos fases anteriores, del cual se derivan los resultados estructurados en hallazgos y conclusiones y e. Factores de éxito propuestos como resultado del análisis anterior.
Dichos factores son presentados en forma matricial para diferenciar a nivel horizontal, los que corresponden a alineación de formulación; y a nivel vertical, cuáles contribuyen a la consecución de los resultados en términos de producto, efecto e impacto basándose en lo expuesto por el Programa de las Naciones Unidas para el Desarrollo (PNUD).The aim of this research is to contribute to harnessing of photovoltaic solar energy in Colombia through PV project’s implantation inside National Interconnected System.
For this purpose, five phases are identified: a. Theorical framework where the meanings of photovoltaic energy, success factor, alignment and formulation are explained; b. State of the art photovoltaic projects in Colombia inside their alignment and formulation phases, another key factors which have been already endorsed by previous investigations for proper alignment and formulation are mentioned here; c. Information collection of Colombia context regarding the same items through interviews and surveys conducting; d. Analysis of information obtained from previous phases, this results are structured in findings and then, conclusions; and e. Success factors which are proposed as the result of previous analysis.
This factors are showed in matrix form in order to differentiate, at a horizontal level, which factors match alignment or formulation phase; and at a vertical level, which factors contribute to achieve the expected results in terms of product, effect or impact according to the theory exposed by United Nations Development Programme (UNDP).MaestríaMagíster en Desarrollo y Gerencia Integral de Proyecto
The compulsory treatment of tuberculosis in Brazil: a fair measure?
No full textFundação Oswaldo Cruz. Escola Nacional de Saúde Pública Sergio Arouca. Rio de Janeiro, RJ, Brasil.O propósito do presente estudo é pensar eticamente a questão da compulsoriedade do tratamento da tuberculose no Brasil. Buscando formular o problema a partir de uma interpelação da medicina enquanto esfera de representação tácita do interesse da sociedade, o estudo defende a hipótese de que o argumento em defesa da medida reflete não apenas um juízo moralmente questionável, mas também um déficit de reconhecimento em relação àqueles para os quais dirige o seu senso de responsabilidade. Esta hipótese é defendida com base em três ensaios argumentativos. O primeiro diz respeito a uma indagação filosófica sobre as condições de validade das normas de ação, em particular no que se refere à relação mantida entre o juízo moral e a ideia de justiça. O segundo trata do juízo médico e da relação terapêutica, isto é, conferindo também às prescrições ocorridas nesse âmbito o estatuto de uma relação francamente moral. O terceiro explora mais diretamente a política de controle da tuberculose no Brasil, em especial no que concerne ao modo como as atuais diretrizes nacionais do tratamento estão comprometidas com uma abordagem eticamente fundamentada do problema.The purpose of this study is to think ethically about the compulsory treatment of tuberculosis in Brazil. Seeking to formulate the problem from an interpellation of medicine as a sphere of tacit representation of the interest of society, the study defends the hypothesis that the argument in defense of the measure reflects not only a morally questionable judgment, but also a deficiency of recognition in respect to those to whom it directs its sense of responsibility. This hypothesis is defended on the basis of three argumentative essays. The first concerns a philosophical inquiry into the validity of the norms of action, in particular as regards the relationship between moral judgment itself and the idea of justice. The second deals with the medical judgment and the therapeutic relationship, that is, also conferring on the prescriptions in this sphere the status of a frankly moral relationship. The third one explores more directly the policy of tuberculosis control in Brazil, especially regarding the way in which current national treatment guidelines are committed to an ethically sound approach to the problem
Evaluation of point cloud features for no-reference visual quality assessment
No full textThe development and widespread adoption of immersive XR applications has led to a renewed interest in representations that are capable of reproducing real-world objects and scenes with high fidelity. Among such representations, point clouds have attracted the interest of industry and academia alike, and new compression solutions have been developed to facilitate their adoption in mainstream applications. To ensure the best quality of experience for the end-user in limited bandwidth scenarios, new full-reference objective quality metrics have been proposed, promoting features designed specifically for point cloud contents. However, the performance of such features to predict the quality of point cloud contents when the reference is not available is largely unexplored. In this paper, we evaluate the performance of features commonly used to model point cloud distortions in a no-reference framework. The obtained features are integrated into a quality value through a support vector regression model. Results demonstrate the potential of full-reference features for no-reference assessment. Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Multimedia Computin
Governance and economic growth
Get PDFBecause protection of property rights cannot be appropriated by any individual, it is widely recognized as being the state's responsibility. Moreover, recent empirical evidence suggests that protection of property rights leads to higher investment levels and faster growth. The extent of property rights protection differs significantly across countries. The author integrates the emergence of property rights within a simple growth framework. Drawing on North (1990), he presents a model where economic performance and enforcement of property rights may reinforce each other.Initial conditions determine the economy's convergence to a high-income or a low-income steady state. Existing empirical evidence offers tentative support for this theory.Judicial System Reform,Labor Policies,Economic Theory&Research,Environmental Economics&Policies,Common Property Resource Development,Economic Theory&Research,Inequality,Common Property Resource Development,Environmental Economics&Policies,Governance Indicators
Uncovering seams in distributed play of tabletop role-playing games
No full textWe uncover how geographically distributed players of tabletop role-playing games engage narrative, ludic, and social aspects of play. Our existing understandings of tabletop role-playing games are centered around co-located play on physical tabletops. Yet, online play is increasingly popular. We interviewed 14 players, experienced with online virtual tabletops. Our findings reveal the seams—points where media, activities, and technology intersect—within virtual tabletop environments that enable distributed players to shift among collaborative storytelling, applying game rules and mechanics, and socially interacting with each other.Multimedia Computin
Weakly-supervised Learning for Fine-grained Emotion Recognition using Physiological Signals
No full textInstead of predicting just one emotion for one activity (e.g., video watching), fine-grained emotion recognition enables more temporally precise recognition. Previous works on fine-grained emotion recognition require segment-by-segment, fine-grained emotion labels to train the recognition algorithm. However, experiments to collect these labels are costly and time-consuming compared with only collecting one emotion label after the user watched that stimulus (i.e., the post-stimuli emotion labels). To recognize emotions at a finer granularity level when trained with only post-stimuli labels, we propose an emotion recognition algorithm based on Deep Multiple Instance Learning (EDMIL) using physiological signals. EDMIL recognizes fine-grained valence and arousal (V-A) labels by identifying which instances represent the post-stimuli V-A annotated by users after watching the videos. Instead of fully-supervised training, the instances are weakly-supervised by the post-stimuli labels in the training stage. The V-A of instances are estimated by the instance gains, which indicate the probability of instances to predict the post-stimuli labels. We tested EDMIL on three different datasets, CASE, MERCA and CEAP-360VR, collected in three different environments: desktop, mobile and HMD-based Virtual Reality, respectively. Recognition results validated with the fine-grained V-A self-reports show that for subject-independent 3-class classification (high/neutral/low), EDMIL obtains promising recognition accuracies: 75.63% and 79.73% for V-A on CASE, 70.51% and 67.62% for V-A on MERCA and 65.04% and 67.05% for V-A on CEAP-360VR. Our ablation study shows that all components of EDMIL contribute to both the classification and regression tasks. Our experiments also show that (1) compared with fully-supervised learning, weakly-supervised learning can reduce the problem of overfitting caused by the temporal mismatch between fine-grained annotations and physiological signals, (2) instance segment lengths between 1-2 s result in the highest recognition accuracies and (3) EDMIL performs best if post-stimuli annotations consist of less than 30% or more than 60% of the entire video watching.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Multimedia ComputingIntelligent System
Avaliadores ad hoc - 2012
No full textRevista Eletrônica de Sistemas de Informação has published, since it started operating in 2002, papers that have been submitted to a rigorous double blind review procedure. In 2012, the following researchers filled in ad hoc reviews for papers submitted to RESI, to whom we are specially grateful: Adolfo Gustavo Serra Seca NetoAlex Antônio Ferraresi Alexandre CidralAmarolinda Zanella Saccol Ana GisbertAna Luísa Mülbert Angela Freitag BrodbeckAntônio Carlos Gastaud MaçadaAntônio Juarez Alencar Carlo Gabriel Porto Bellini Cesar Augusto Tacla Claudia Tania PicininCiro Christo FernandesCristiane Pedron Cristiane Sonia ArroyoDorival de Stefani Edimara Mezzomo Luciano Edmir Parada Vasques Prado Edson Ronaldo Guarido Filho Felipe Reis Graeml Fúlvio CristofoliGabriela Viale Pereira Gilson Ditzel SantosGustavo Alberto Giménez-Lugo Indira Guzman Ionara Rech Jairo Francisco de SouzaJoão Armênio NetoJoão Roberto FregaJorge Luís Nicolas Audy José Ignácio Jaeger Neto Jurandir PeinadoKarin Sylvia GraemlLeila HumesLilian A. P. MiguelLuís Antônio JanssenLuís André Wernecke Fumagalli Luiz Antonio JoiaMarco Antônio Pinheiro da Silveira Marcos Gaspar Maria Alexandra Cunha Marie Anne Macadar Maurício Gregianin TestaMaurício Reinert do Nascimento Mírian Oliveira Ney Luiz Bellegard Pablo GimenezPaulo César StadziszPedro Porfírio Muniz FariasPietro Cunha DolciRaul Ceretta Nunes Renata Mendes de Araújo Renato de Oliveira MoraesRicardo EngelbertRita de Cássia de Faria PereiraRodrigo Baroni de CarvalhoSimone Bacellar Leal Ferreira Valter Moreno Jr. Zandra BalbinotA Revista Eletrônica de Sistemas de Informação tem publicado, desde quando iniciou suas atividades em 2002, artigos que tenham sido aprovados após criterioso critério de avaliação pelos pares, adotando procedimento de double blind review. Em 2012, participaram da avaliação de artigos para a RESI os seguintes pareceristas, a quem a revista é muito grata: Adolfo Gustavo Serra Seca NetoAlex Antônio Ferraresi Alexandre CidralAmarolinda Zanella Saccol Ana GisbertAna Luísa Mülbert Angela Freitag BrodbeckAntônio Carlos Gastaud MaçadaAntônio Juarez Alencar Carlo Gabriel Porto Bellini Cesar Augusto Tacla Claudia Tania PicininCiro Christo FernandesCristiane Pedron Cristiane Sonia ArroyoDorival de Stefani Edimara Mezzomo Luciano Edmir Parada Vasques Prado Edson Ronaldo Guarido Filho Felipe Reis Graeml Fúlvio CristofoliGabriela Viale Pereira Gilson Ditzel SantosGustavo Alberto Giménez-Lugo Indira Guzman Ionara Rech Jairo Francisco de SouzaJoão Armênio NetoJoão Roberto FregaJorge Luís Nicolas Audy José Ignácio Jaeger Neto Jurandir PeinadoKarin Sylvia GraemlLeila HumesLilian A. P. MiguelLuís Antônio JanssenLuís André Wernecke Fumagalli Luiz Antonio JoiaMarco Antônio Pinheiro da Silveira Marcos Gaspar Maria Alexandra Cunha Marie Anne Macadar Maurício Gregianin TestaMaurício Reinert do Nascimento Mírian Oliveira Ney Luiz Bellegard Pablo GimenezPaulo César StadziszPedro Porfírio Muniz FariasPietro Cunha DolciRaul Ceretta Nunes Renata Mendes de Araújo Renato de Oliveira MoraesRicardo EngelbertRita de Cássia de Faria PereiraRodrigo Baroni de CarvalhoSimone Bacellar Leal Ferreira Valter Moreno Jr. Zandra Balbino
Multi-Camera Registration for VR: A flexible, feature-based approach
No full textReal-time point cloud capturing and multiple depth camera 3D reconstruction are vital elements that bring real-time representations into a virtual world and provide an im- mersive experience which can be applied to develop VR/AR applications. To make this possible, camera calibration plays an essential role in providing important camera spa- tial information for 3D scene reconstruction. However, there are still many drawbacks left to improve on camera extrinsic parameters calculation in most existing systems: such as the procedure relies too much on extra calibration markers, or specific depth sensors may have complicated procedures that cannot easily be generalized to other depth sensors.To improve on this, we propose a markerless, feature-based pipeline for multiple cam- era re-calibration. This pipeline contains four main stages. It adopts feature descriptor extracting and matching to solve the issue of requiring additional markers, and the point cloud registration accuracy is improved by using point cloud segmentation and part selection. The experiment results obtained in this research show that this pipeline can calibrate four cameras with a single object (such as a chair, lamp) without the need for additional calibration markers. The extrinsic parameters calculated using this pipeline is more accurate and requires less processing time than originally. This pipeline provides the potential for further human point cloud capturing and camera calibration in real-time 3D reconstruction.VRTogetherComputer Scienc
- …
