Repositorio Institucional Universidad EAFIT ::Examinando por Materia "Virtual"

Examinando por Materia "Virtual"

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Achieving object persistence in an augmented reality indoor environment
(2003-01-01) Gutiérrez, M.D.; Márquez, A.M.; Trefftz, H.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
In this paper we present a system for achieving object persistence in Augmented Reality Indoors Environments. In AR systems based on the Augmented Reality toolkit without object persistence, virtual objects appear and disappear as the corresponding pattern gets in and out of the user's field of view. Object persistence allows the environment to remember the relative position and orientation of virtual objects, making them appear more stable to the user. We describe object persistence as a series of transformations applied to the objects in a simple indoor environment. We then present the results of a quantitative experiment that shows how interactivity is improved by the use of object persistency.
Adaptive architecture to support context-aware Collaborative Networked Virtual Surgical Simulators (CNVSS)
(SPRINGER, 2014-01-01) Diaz, C.; Trefftz, H.; Quintero, L.; Acosta, D.; Srivastava, S.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
Stand-alone and networked surgical virtual reality based simulators have been proposed as means to train surgical skills with or without a supervisor nearby the student or trainee. However, surgical skills teaching in medicine schools and hospitals is changing, requiring the development of new tools to focus on: (i) importance of mentors role, (ii) teamwork skills and (iii) remote training support. For these reasons a surgical simulator should not only allow the training involving a student and an instructor that are located remotely, but also the collaborative training session involving a group of several students adopting different medical roles during the training session. Collaborative Networked Virtual Surgical Simulators (CNVSS) allow collaborative training of surgical procedures where remotely located users with different surgical roles can take part in a training session. Several works have addressed the issues related to the development of CNVSS using various strategies. To the best of our knowledge no one has focused on handling heterogeneity in collaborative surgical virtual environments. Handling heterogeneity in this type of collaborative sessions is important because not all remotely located users have homogeneous Internet connections, nor the same interaction devices and displays, nor the same computational resources, among other factors. Additionally, if heterogeneity is not handled properly, it will have an adverse impact on the performance of each user during the collaborative session. In this paper we describe the development of an adaptive architecture with the purpose of implementing a context-aware model for collaborative virtual surgical simulation in order to handle the heterogeneity involved in the collaboration session. © 2014 Springer International Publishing.
Agents as tutors in augmented reality
(2003-01-01) Álvarez, N.; Trefftz, H.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
Interaction between virtual entities and human beings should be similar to the normal interaction between human beings. Verbal interaction is the usual way of interaction among humans, but the interfaces that allow verbal communication between a human being and an agent (virtual human) have a limited vocabulary, need a lot of training and are expensive. In this paper we propose an Augmented Reality System with an unidirectional interface between an agent and a person. By using gestures, animations and adequate texts the agent can show a user how to perform a simple task. We hope that the tests to be conducted will show how useful this unidirectional interface is.
Collaborative and distributed augmented reality in teaching multi-variate calculus
(2006-01-01) Orozco, C.; Esteban, P.; Trefftz, H.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
This article presents the first results of using an Augmented Reality (AR) tool, designed to support tutoring sessions in multi-variate calculus. The tool is used either in a face-to-face setting in which the instructor and the students are collocated or in a distance setting, in which the instructor and students are physically in remote places. The tool was used with two groups of students of Differential Calculus. The students had not been exposed to the concept of equations involving 3 variables and the corresponding surfaces in space. The experience explored how students generalized 2D graphics and equations with their 3D surfaces counterparts with the help of the tool.
A collaborative tool for synchronous distance education
(2004-01-01) Agudelo, A.; Escobar, L.; Restrepo, J.; Quiroz, A.; Trefftz, H.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
In this paper we report results of the use of a telepresence application in a simulated distance education setting. The application combines video-conference with a networked virtual environment in which the instructor and the students can experiment with virtual object in a collaborative manner. The teaching for Understanding (TFU) framework is used as the pedagogical approach. Current preliminary results show that the combination of the telepresence application with TFU, can compensate for the lack of physical presence of the instructor in the classroom.
Collaborative virtual environments for teaching physics
(SPRINGER, 2007-01-01) Giraldo, F.; Rojas, Á.M.J.; Esteban, P.; Trefftz, H.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
Eafit University created a Telepresence application for distance education. It supports bidirectional audio and video and a shared virtual environment that allows the instructor and students to manipulate virtual objects in a collaborative manner, thereby reinforcing the learning process. In this paper we report the experience of creating new contents and deploying the tool in a Physics course at Universidad del Quindío. The tool was improved an extended in order to include new functionality and make it easier for development teams to create new content. Teaching for Understanding was used as pedagogical framework for course creation and also as a guide to develop the interviews that were used to capture user's perceptions and to asses the improvements in the learning process. The results showed that the use of the tool had a positive impact on the students' understanding of the topics at hand. © 2007 Springer.
Combinatory multicast for differentiated data transmission in distributed virtual environments
(ACTA PRESS, 2004-01-01) Quiroz, A; Trefftz, H; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
The shortage of multicast addresses is a factor that limits their use in Intemet-based applications. Since multicast plays a very important role in supporting resource heterogeneity among users of applications with a high demand of computational resources, such as Distributed Virtual Environments, the sparing use of these addresses is of great importance. This paper suggests a scheme for the combination of multicast groups for differentiated data transmission, based on layered multicast, with which the number of different levels of service that can be provided to users of a shared virtual environment with a fixed number of groups is multiplied. For applications where the levels of service correspond to different transmission rates, the scheme also significantly reduces bandwidth utilization. We present a basic method for its implementation and describe preliminary tests to prove its functionality.
Design and implementation of a low-cost projected virtual reality system to support learning processes
(Springer Verlag, 2011-01-01) Gómez, R.; Trefftz, H.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
Virtual Reality technologies have been successfully incorporated into the learning processes and potential new applications in education are explored continuously. We found that one of the difficulties to popularize its use in the educational context, in countries with emerging and developing economies, is the cost of hardware required to generate satisfactory immersive experience. In this work we considered virtual reality from the perspective of human-computer interaction to support learning processes. The characteristics of low-cost projected virtual reality system (PVR) proposed, combines study and integration of available technology solutions, the development of an image synchronization routine that enables the use of a single video projector and the design of a printable pattern that preserve the state of polarization on the projection screen. © 2011 Springer-Verlag.
Design of a competences based teaching model supported in the integration of repositories and LMS platforms for the automatic control of processes course
(Institute of Electrical and Electronics Engineers Inc., 2015-01-01) Gomez, G.I.C.; Diaz, T.A.G.; Zea, R.C.M.; Zapata, R.L.F.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
The Automatic Process Control course is part of the Mechanical Engineering, Process Engineering and Production Engineering programs, offered by EAFIT University (Medellin, Colombia). This course has had a number of reforms in recent years, from two academic spaces to one that contains all the content and features them from theoretical and practical components. With this transformation, was generated the need to reduce the time commitment to each of the thematic, causing learning issues in students. For this reason, we have proposed a new reform in the course through the implementation of a content management model based on competences and supported by the integration of repositories and LMS platforms. This model seeks to train students in the skills defined by the courses and because of this, it is important that the learning process provide mechanisms to validate the skill level of each student, taking into account the outcome of the validation should correspond directly to the skills acquired in the training process. To support this model, there are technological tools as platforms for learning management and learning object repositories that support the online teaching and learning processes, and support the use of standards, generating interoperability, reusability, adaptability and scalability content. © 2014 IEEE.
Design of a competences based teaching model supported in the integration of repositories and LMS platforms for the Automatic Control of Processes course.
(IEEE, 2014-01-01) Gomez G, Isabel Cristina; Diaz T, Adalberto Gabriel; Zea R, Claudia Maria; Zapata R, Luis Felipe; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
The Automatic Process Control course is part of the Mechanical Engineering, Process Engineering and Production Engineering programs, offered by EAFIT University (Medellin, Colombia). This course has had a number of reforms in recent years, from two academic spaces to one that contains all the content and features them from theoretical and practical components. With this transformation, was generated the need to reduce the time commitment to each of the thematic, causing learning issues in students. For this reason, we have proposed a new reform in the course through the implementation of a content management model based on competences and supported by the integration of repositories and LMS platforms. This model seeks to train students in the skills defined by the courses and because of this, it is important that the learning process provide mechanisms to validate the skill level of each student, taking into account the outcome of the validation should correspond directly to the skills acquired in the training process. To support this model, there are technological tools as platforms for learning management and learning object repositories that support the online teaching and learning processes, and support the use of standards, generating interoperability, reusability, adaptability and scalability content.
Dynamic server allocation in virtual environments, using quadtrees for dynamic space partition
(2003-01-01) Restrepo, A.; Montoya, A.; Trefftz, H.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
In actual applications of virtual environments, one of the problems that has received attention is the way to assign computational resources to those who participate in the system. In most cases, static resource allocation is used. Static allocation is simple but has several limitations, among them, the missutilization of resources. In this paper we present a proof-of-concept of a new system and report the results of experiments with a system that accomplishes dynamic resource allocation by using Quadtrees for space partitioning, in a Shared Virtual Environment.
Estudio de prefactibilidad de un negocio de operador móvil virtual de soluciones Machine-to-Machine y aplicaciones de IoT, en Colombia
(Universidad EAFIT, 2023) Gaviria Méndez, Sergio Fabián; Salazar Gómez, Francisco Javier; Uribe de Correa, Beatriz Amparo
Handling heterogeneity in networked virtual environments
(MIT PRESS, 2003-02-01) Trefftz, H; Marsic, I; Zyda, M; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
The availability of inexpensive and powerful graphics cards as well as fast Internet connections make networked virtual environments viable for millions of users and many new applications. It is therefore necessary to cope with the growing heterogeneity that arises from differences in computing power, network speed, and users' preferences. This paper describes an architecture that accommodates the heterogeneity while allowing a manager to define systemwide policies. One of the main objectives of our scheme is to allow slower nodes to participate in the session by preventing fast nodes from flooding slow nodes with too many messages. Policies and users' preferences can be expressed as simple linear equations forming a model that describes the system as a whole as well as its individual components. When solutions to this model are mapped back to the problem domain, viable solutions that accommodate heterogeneity and system policies are obtained. For example, slower nodes may receive less frequent updates than faster ones for one or several information streams. The results of our experiments with a proof-of-concept system are described.
An immersive virtual reality training system for mechanical assembly
(2011-01-01) Peniche, A.; Diaz, C.; Trefftz, H.; Paramo, G.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
Given the growing evolution of technology, machinery and manufacturing techniques, conventional methodologies for training the workforce are not enough for the current needs. Therefore methodologies capable to accelerate the training process and able to train the trainee in a wide range of scenarios are claimed for the industrial sector. Virtual reality offers an alternative that has been successfully implemented in other industries, and virtual reality based training systems have numerous advantages over the conventional methodologies, making it a very good option. Based on that premise, this paper explores the implementation of an immersive training system for mechanical assembly based on virtual reality for improving the training process. This system was proved to be as effective as the conventional methodology.
Poster: Collaborative data exploration using two navigation strategies
(IEEE COMPUTER SOC, 2009-01-01) Gomez, Omar; Trefftz, Helmuth; Boulanger, Pierre; Bischof, Walter F.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
Virtual collaborative systems are vital tools for accessing and sharing scientific data visualizations. This paper shows how two different modes of collaboration can affect user performance in a specific exploration task. Experiments with groups of users that are working in pairs showed that the lack of mobility can affect the ability to achieve specific exploration goals in a virtual environment. Our analysis reveals that the task was completed more efficiently when users were allowed to move freely and independently instead of working with limited mobility. In these systems, users adapted their own abilities and minimized theeffect of mobility restrictions. ©2009 IEEE.
Remote teaching functional and anatomical concepts skeletal muscle system
(SPRINGER, 2008-01-01) Leon, C.A.D.; Trefftz, H.; Pineda, F.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
In this paper we present the results of using a virtual content developed inside a telepresence application. The application combines video-conference with networked virtual environment allowing an instructor and a group of students to manipulate a virtual object in a collaborative manner. The virtual environment describes bones and muscular structures in order to support teaching of musculoskeletical concepts in a remote physiology class. The virtual environment simulates the movement of flexion and extension of the elbow and the muscular contraction. Current preliminary results show that the content developed within telepresence application can compensate for the lack of physical presence of the instructor in the classroom. © Springer-Verlag Berlin Heidelberg 2007.
Simulating Soft Tissues using a GPU approach of the Mass-Spring Model
(IEEE COMPUTER SOC, 2010-01-01) Diaz Leon, Christian Andres; Eliuk, Steven; Trefftz Gomez, Helmuth; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
The recent advances in the fields such as modeling bio-mechanics of living tissues, haptic technologies, computational capacity, and graphics realism have created conditions necessary in order to develop effective surgical training using virtual environments. However, virtual simulators need to meet two requirements, they need to be real-time and highly realistic. The most expensive computational task in a surgical simulator is that of the physical model. The physical model is the component responsible to simulate the deformation of the anatomical structures and the most important factor in order to obtain realism. In this paper we present a novel approach to virtual surgery. The novelty comes in two forms: specifically a highly realistic mass-spring model, and a GPU based technique, and analysis, that provides a nearly 80x speedup over serial execution and 20x speedup over CPU based parallel execution.
Simulating soft tissues using a GPU approach of the mass-spring model
(2010-01-01) Leon, C.A.D.; Eliuk, S.; Gomez, H.T.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
The recent advances in the fields such as modeling bio-mechanics of living tissues, haptic technologies, computational capacity, and graphics realism have created conditions necessary in order to develop effective surgical training using virtual environments. However, virtual simulators need to meet two requirements, they need to be real-time and highly realistic. The most expensive computational task in a surgical simulator is that of the physical model. The physical model is the component responsible to simulate the deformation of the anatomical structures and the most important factor in order to obtain realism. In this paper we present a novel approach to virtual surgery. The novelty comes in two forms: specifically a highly realistic mass-spring model, and a GPU based technique, and analysis, that provides a nearly 80x speedup over serial execution and 20x speedup over CPU based parallel execution. ©2010 IEEE.
USING VIRTUAL AND AUGMENTED REALITY IN THE CALCULUS CLASSROOM
(IATED-INT ASSOC TECHNOLOGY EDUCATION & DEVELOPMENT, 2020-01-01) Vega, J.; Nieto, A.; Cordoba, C.; Gil, G.; Trefftz, H.; Esteban, P.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
Education, nowadays, is going through a transition process. ``New Students'' require tools that allow them to improve their technical knowledge and, besides that, strengthen soft skills such as communication and teamwork. Developments that use Virtual Reality and Augmented Reality as a means for teaching have shown to have positive impacts on factors such as understanding, motivation and agility in the learning process of university students. In this article we describe the development of two tools, one based on Virtual Reality and one on Augmented Reality, to teach Multivariate Calculus to university students. The applications through experimentation and collaborative observation, allow them to understand concepts such as functions, quadratic surfaces, directional derivative, traces and contour lines. Both applications provide students and educators the change to experiment though digital environments used in a class in multivariate calculus. Each application includes two different roles: student and educator. The student is an observer. The professor and the students are represented through avatars that interact with each other. The educator role is more complex, allowing the user to create and modify functions and quadratic surfaces and create planes that intersect the surfaces that represent the functions. Students within the Virtual Reality environment experience ran the application on their phones. They used Virtual Reality glasses to immerse themselves in the experience and a remote Bluetooth controller to walk through the virtual environment. They were able to walk on and under the displayed mathematical functions. The instructor, on the other hand, created and modified those functions and directed the learning experience showing different interactions among planes and surfaces. The instructor ran the VR application on a computer. Meanwhile, students using the Augmented Reality application, were able to visualize functions and surfaces through the camera of their phones when pointing to the marker. Each student had the possibility of pointing to any place within the surface with a green dotted marker. They could also observe overlapping with the surfaces. The instructor had the same functionalities as in the virtual reality application. This study showed that almost all students encountered the experience satisfying and helpful. They thought it was revealing in many ways, allowing them to visualize abstract surfaces and traces easily. Also, some students pointed out their wish of including these experiences since the beginning of the course. In the full article, we plan to describe the creation of both VR and AR applications and provide data on the student perceptions.
WeSketch: A 3D real time collaborative virtual environment that improves the GUI sketching task
(2010-01-01) Hernández, H.A.; Trefftz, H.; Universidad EAFIT. Departamento de Ingeniería de Sistemas; I+D+I en Tecnologías de la Información y las Comunicaciones
Many tools help GUI designers to produce prototypes of their future applications, but when this job requires the collaboration with geographically dispersed partners some problems arise like lack awareness of the others' work, concurrent manipulation of virtual objects and non-fluent communication of actions and intentions. We Sketch allows a small geographically distributed group to build GUI prototypes in a highly participative manner, keeping everyone aware of what is going on. A 3D virtual round table, virtual sheets simulating sketches, avatars representing users, an audio communication system and a shared view of sketches are the pieces that allow designers to discuss and co-design GUIs in real time offering a comfortable and pleasant experience. This paper describes the tool and the results of a set of experiments conducted in order to validate the hypothesis: "WeSketch allows a small group of designers who are geographically dispersed to be more efficient and feel more motivated during the GUI Sketching task than they do with current tools". © 2011 IEEE.

Examinando por Materia "Virtual"

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