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3. Context-aware task scheduling slgorithm for the Fog paradigm: a model proposal

Author

Barros, Celestino Lopes de, Rocio, Vitor, Sousa, André, Paredes, Hugo, and Teixeira, Olavo

Subjects
Task scheduling, 12:Produção e Consumo Sustentáveis [ODS], Scheduling in fog paradigm, Fog computing paradigm, Context awareness
Abstract

FMEC 2022. 7ª Conferência Internacional sobre "Fog e Mobile Edge Computing", realizada em Paris, França, de 12-15 de dezembro de 2022. Task scheduling in fog paradigm is very complex and, in the literature, according to the author’s knowledge there are still few studies. In the cloud architecture, it is widely studied, and, in much research, it is approached from the perspective of service providers. Trying to bring innovative contributions in these areas, in this paper, we propose a solution to the context-aware task-scheduling problem for fog paradigm. In our proposal, different context parameters are normalized through Min-Max normalization, requisition priorities are defined through the application of the Multiple Linear Regression (MLR) technique and scheduling is performed using Multi-Objective Non-Linear Programming Optimization (MONLIP) technique. The results obtained from simulations in the iFogSim toolkit, show that our proposal performs better compared to the non-context-aware proposals. info:eu-repo/semantics/acceptedVersion

Published
2022

7. Design and Evaluation of a Choreography-Based Virtual Reality Authoring Tool for Experiential Learning in Industrial Training.

Author

Cassola, Fernando, Mendes, Daniel, Pinto, Manuel, Morgado, Leonel, Costa, Sara, Anjos, Luis, Marques, David, Rosa, Filipe, Maia, Ana, Tavares, Helga, Coelho, Antonio, and Paredes, Hugo

Abstract

The use of virtual reality (VR) for industrial training helps minimize risks and costs by allowing more frequent and varied use of experiential learning activities, leading to active and improved learning. However, creating VR training experiences is costly and time-consuming, requiring software development experts. Additionally, current authoring tools lack integration with existing data and are desktop-oriented, which detach the pedagogic process of creating the immersive experience from experiencing it in a situated context. In this article, we present a novel interactive approach for immersive authoring of VR-based experiential training by the trainers themselves, from inside the virtual environment and without the support of development experts. The design includes identifying interactable elements, such as 3-D models, equipment, tools, settings, and environment. The trainer also specifies by demonstration the actions to be performed by trainees, as a virtual choreography. During course execution, trainees’ activities are also registered as virtual choreographies and matched to those specified by the trainer. Thus, trainer and trainee are culturally situated within their area semantics and social discourse, rather than adopting concepts of the VR system for the learning content. We conducted a usability case study with professionals from an international wind energy company, using detailed models of wind turbines and real-world procedures. Trainers set up a training course using the immersive authoring tool, and trainees executed the course. The learning experience and usability were analyzed, and the training was certified by comparing real-world task completion between a user who had undergone virtual training and a user who did not. [ABSTRACT FROM AUTHOR]

Published
2022
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42. Development of platform-independent multi-user choreographies for virtual worlds based on ontology combination and mapping.

Author

Silva, Emanuel, Silva, Nuno, Paredes, Hugo, Martins, Paulo, Fonseca, Benjamim, and Morgado, Leonel

Abstract

This paper presents two contributions: (i) a system architecture capable of staging platform-independent choreographies within different virtual worlds, and (ii) an ontology-based solution for capturing and representing multi-user choreographies with reduced time/effort. We argue that choreographies for virtual worlds should be clearly separated from the technical characteristics of their execution in virtual world technological platforms. Due to the heterogeneity of the various virtual worlds and their domain requirements, we propose exploiting the modularity, generality, and granularity dimensions of ontologies to simplify and empower the choreography modeling capabilities. Instead of a unique ontology, several ontologies with different levels of generality and granularity can be progressively combined to support the modeling requirements of a given choreography. Because these ontologies are aligned with the ontology of each specific virtual world platform, the mapping and transformation between the core ontology is simplified and automated, thus reducing the development and time-to-market. [ABSTRACT FROM PUBLISHER]

Published
2012
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43. Navigation module of Blavigator prototype.

Author

Adao, Telmo, Magalhaes, Luis, Fernandes, Hugo, Paredes, Hugo, and Barroso, Joao

Abstract

People with vision disabilities deal with serious limitations while moving around. Common navigation systems do not fully address the needs of blind people, which can only be attended with an adapted product. Blavigator is a navigation system for the blind, currently being developed at the University of Trás-os-Montes e Alto Douro. Blavigator proposes a solution to enhance mobility, finding routes and providing contextual information about points of interest in user's surroundings, guiding him to a desired destination. In this paper is presented the navigation module of Blavigator that ensures a continuous feed of information with sufficient detail allowing the blind user to reach the desired destination successfully. A pilot test with 5 blindfolded persons was conducted to test the navigation module feasibility and do some performance analysis. The results are promising and provide evidence that the navigation module helps blind people to successfully reach the desired destination. [ABSTRACT FROM PUBLISHER]

Published
2012

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