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  • 1.
    Louloudi, Athanasia
    et al.
    Örebro University, School of Science and Technology.
    Klügl, Franziska
    Örebro University, School of Science and Technology.
    A new framework for coupling agent-based simulation and immersive visualisation2012In: Proceedings of the 26th European Conference on Modelling and Simulation (ECMS) / [ed] Klaus G. Troitzsch, Michael Möhring, Ulf Lotzmann, ECMS European Council for Modelling and Simulation, 2012, p. 51-57Conference paper (Refereed)
    Abstract [en]

    In this contribution, we are dealing with the problem of on-demand interfacing agent-based simulations with Virtual Reality (VR) systems. We focus on how to handle and relate information between the two systems and investigate a generic way for mapping the information whichdescribes the state and context of a simulated agent toits 3D counterpart in the VR system. We provide details about the issues involved as well as propose generic representations and procedures that cope with the granularity discrepancies between the two systems. Finally, we present a first prototype and discuss aspects of its performance.

  • 2.
    Louloudi, Athanasia
    et al.
    Örebro University, School of Science and Technology.
    Klügl, Franziska
    Örebro University, School of Science and Technology.
    Immersive face validation: a new validation technique for agent-based simulation2012Conference paper (Refereed)
    Abstract [en]

    Agent-based simulation is very popular for its ability to approximate real life problems in an efficient way. To assure that the developed model is sufficienlty correct, validation needs to be performed. This contribution proposes a new approach to validate agent-based simulation models. To this end, a novel face validation technique is presented that enables systematic plausibility checks by a human expert immersed in a fine grain virtual reality environment that is the exact representation of the simulated multiagent model. It turns out that Immersive Face Validation, is a technically feasible process which offers great insight into the behaviour context of individual agents.

  • 3.
    Louloudi, Athanasia
    et al.
    Örebro University, School of Science and Technology.
    Klügl, Franziska
    Örebro University, School of Science and Technology.
    Towards a generic connection between agent behaviour and visualisation2011Conference paper (Refereed)
    Abstract [en]

    When interfacing standard agent-based simulations with Virtual Reality (VR) systems online during simulation, an important aspect to be addressed is what information needs to be tackled on both sides and how to relate this information. This is not a trivial task as it involves the association of abstract domain-specific agent properties in the simulation to low level information in the virtual world. During runtime, sufficient and appropriate information from the simulation has to be sent in a way that can be processed by the VR system. We want to identify a generic way for mapping the information which describes the state and context a simulated agent is in, to its detailed 3D representation inside a VR system. Hereby, the different time granularities of the two system form a core problem for maintaining consistency between the two platforms. In this contribution we discuss in detail the issues involved, propose generic representations as well as procedures to fill them. Finally we present a first prototype and its performance evaluation. 

  • 4.
    Louloudi, Athanasia
    et al.
    Örebro University, School of Science and Technology.
    Klügl, Franziska
    Örebro University, School of Science and Technology.
    Visualisation on demand for agent-based simulation2013In: Cognitive agents for virtual environments: First International Workshop, CAVE 2012, Held at AAMAS 2012, Valencia, Spain, June 4, 2012, Revised Selected Papers / [ed] Frank Dignum, Cyril Brom, Koen Hindriks, Martin Beer, Deborah Richards, Berling, Heidelberg: Springer, 2013, , p. 106-119Chapter in book (Refereed)
    Abstract [en]

    Agent-based simulation can be a useful tool when analysing complex systems such as real world scenarios. In multi-agent models when no quantitative data are available we have to search for new solutions in order to verify that the simulated model is appropriate with respect to the real one. Typical solutions approach the problem of missing data by considering contributions of human experts. In our work, we enhance the transparency of the simulation via a detailed visualisation in order to enable an immersive evaluation of the simulated model. We initially identify several conceptual and technical problems regarding the combination of a multi-agent simulation system with a game engine. We then propose a framework which implements a solution for generic processing and communication of information while maintaining consistency between the two systems. The end result automates several processes in a context independent manner and minimises the overall modeller’s effort.

  • 5.
    Louloudi, Athanasia
    et al.
    Örebro University, School of Science and Technology.
    Klügl, Franziska
    Örebro University, School of Science and Technology.
    Visualizing agent-based simulation dynamics in a CAVE: issues and architectures2011In: 2011 Federated Conference on Computer Science and Information Systems (FedCSIS), IEEE, 2011, p. 651-658Conference paper (Refereed)
    Abstract [en]

    Displaying an agent-based simulation on an immersivevirtual environment called CAVE (Cave Automatic Virtual Environment), a human expert is enabled to evaluate the simulation’s dynamics from the same point of view as in real life- from a within perspective instead of a birds eye view. As thisform of face validation is useful for many multiagent simulations,it should be possible to setup such a system with as little effortas possible. In this context, we systematically analyse the critical issues that a realization of such a system raises. Addressing these problems, we finally discuss design aspects of basic frameworkarchitectures.

  • 6.
    Louloudi, Athanasia
    et al.
    Örebro University, School of Science and Technology.
    Mosallam, Ahmed
    Örebro University, School of Science and Technology.
    Marturi, Naresh
    Örebro University, School of Science and Technology.
    Janse, Pieter
    Örebro University, School of Science and Technology.
    Hernandez Bennetts, Victor
    Örebro University, School of Science and Technology.
    Integration of the humanoid robot Nao inside a smart home: a case study2010Conference paper (Refereed)
    Abstract [en]

    This paper presents a case study demonstrating the integration of the humanoid robotic platform Nao within a Network Robot System (NRS) application. The specific scenario of interest takes place in a smart home environment; the task being that of bringing a can of soda from a fridge to a human user. We use this concrete scenario to evaluate how the performance of such a robot can be affected by being embedded inside an intelligent domestic environment. This study points out that, by cooperating with different components on the network the overall performance of the robot is increased.

  • 7.
    Stoyanov, Todor
    et al.
    Örebro University, School of Science and Technology.
    Louloudi, Athanasia
    Örebro University, School of Science and Technology.
    Andreasson, Henrik
    Örebro University, School of Science and Technology.
    Lilienthal, Achim J.
    Örebro University, School of Science and Technology.
    Comparative evaluation of range sensor accuracy in indoor environments2011In: Proceedings of the 5th European Conference on Mobile Robots, ECMR 2011 / [ed] Achim J. Lilienthal, Tom Duckett, 2011, p. 19-24Conference paper (Refereed)
    Abstract [en]

    3D range sensing is one of the important topics in robotics, as it is often a component in vital autonomous subsystems like collision avoidance, mapping and semantic perception. The development of affordable, high frame rate and precise 3D range sensors is thus of considerable interest. Recent advances in sensing technology have produced several novel sensors that attempt to meet these requirements. This work is concerned with the development of a holistic method for accuracy evaluation of the measurements produced by such devices. A method for comparison of range sensor output to a set of reference distance measurements is proposed. The approach is then used to compare the behavior of three integrated range sensing devices, to that of a standard actuated laser range sensor. Test cases in an uncontrolled indoor environment are performed in order to evaluate the sensors’ performance in a challenging, realistic application scenario.

    Download full text (pdf)
    Stoyanov_etal_2011-ECMR-3D_Range_Sensors_Accuracy_Evaluation.pdf
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