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1997 Scientific visualization Conference, dagstuhl 1997

作者： Bender, M. Klein, R. Ebert, A. Rodrian, H. Computer Graphics Group Department of Computer Science University of Kaiserslautern Germany Intelligent Visualization and Simulation Systems German Research Center for Artificial Intelligence GmbH Germany Human Modeling Department TECMATH GmbH and Co. KG Kaiserslautern Germany

ISBN: (纸本)0769505031

Modern web-based Scientific visualization applications try to overcome common limitations imposed by limited internet bandwidth, server bottlenecks or network latency. A further aspect is the desire to gain platform independence by solely using instruments which are platform independent by conception: the programming language Java, the Virtual Reality Modeling Language (VRML), or the 3D API *** present a prototype of a hybrid web-based Scientific visualization system which makes use of the increasing computational power of modern desktop workstations and personal computers on the client side, and the superior performance provided by a powerful machine on the server side. In order to achieve high interaction rates and to balance computational load the user can dynamically assign selected tasks to his client or to the *** the scientific field of human modeling we have implemented a hybrid web-based toolkit for the modeling of human muscles and skin. Our application allows the on-line generation and manipulation of three-dimensional implicit muscle models in a heterogeneous network and it offers various parameters to adjust computation and response time versus rendering quality. © 1997 IEEE Computer Society.

关键词： Heterogeneous networks

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Flight Deck Design of a Hybrid Turbine/Electric Passenger Aircraft 43

Flight Deck Design of a Hybrid Turbine/Electric Passenger Ai...

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43rd AIAA DATC/IEEE Digital Avionics systems Conference, DASC 2024

作者： Etherington, Timothy Aurthur, Trey Hill, Melissa Litt, Jonathan Simulation and Visualization Analytics Mechanics Associates HamptonVA United States Aerospace Flight Systems Branch Nasa Langley Research Center HamptonVA United States Simulation Development and Analysis Branch Nasa Langley Research Center HamptonVA United States Intelligent Control Autonomy Branch Nasa Glenn Research Center ClevlandOH United States

ISBN: (纸本)9798350349610

NASA is exploring the development of a 180-passenger subsonic single engine aft turbine aircraft, The aft turbine provides electric power in a hybrid design to wing mounted electric engines, creating a highly efficient, high-bypass-ratio fan equivalent. The SUbsonic Single Aft eNgine (SUSAN) aircraft is being developed as a sustainable subsonic regional aircraft that seeks to reduce emission levels by 50% in the next few decades. Pilot-in-the-loop studies were conducted at the NASA Langley Research Center in Hampton, Virginia, to explore the flight deck design for the hybrid electric aircraft. Following modern trends in commercial aircraft flight decks with full time augmented controls and a quiet and dark philosophy, single throttle and simplified engine displays were developed for the SUSAN aircraft. The aircraft includes a single aft mounted turbine engine and 16 wing mounted electric fans. The final design was developed from feedback received during an earlier pilot-in-the-loop study where one, two, and three throttles were tested in standard airline operations, including various failures of the turbine and electric engines. Current flight deck designs normally provide control inceptors for each propulsion engine and an engine display for all primary aircraft engine parameters. With full time augmentation expected, a single throttle control with autothrottle always engaged, even during failures, is desired. Augmentation of flight controls using distributed thrust also requires full time control of the electric engines using automation. Additionally, electric engine thrust is augmented during climb based on battery state of charge. Thrust augmentation changes faster than human reaction time and therefore requires full-time automation. A pilot-in-the-loop study was conducted at the NASA Langley Research Center in Hampton, Virginia, to test the final design of the single throttle with simplified engine displays. Fourteen airline pilots evaluated the single throttle

关键词： Bypass ratio

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A Hybrid Web-Based Toolkit for Human Modeling

A Hybrid Web-Based Toolkit for Human Modeling

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IEEE Scientific visualization Conference (SciVis)

作者： M. Bender R. Klein A. Ebert H. Rodrian Computer Graphics Group Department of Computer Science University of Kaiserslautern Germany Human Modeling Department TECMATH GmbH and Company KG Kaiserslautern Germany Intelligent Visualization and Simulation Systems German Research Center for Artificial Intelligence Germany

关键词： Humans visualization Delay Java Muscles IP networks Bandwidth Network servers Web server Performance gain

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Flight Deck Design of a Hybrid Turbine/Electric Passenger Aircraft

Flight Deck Design of a Hybrid Turbine/Electric Passenger Ai...

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Conference on Digital Avionics systems (DASC)

作者： Timothy Etherington Trey Aurthur Melissa Hill Jonathan Litt Simulation and Visualization Analytics Mechanics Associates Hampton Virginia USA Aerospace Flight Systems Branch NASA Langley Research Center Hampton Virginia USA Simulation Development and Analysis Branch NASA Langley Research Center Hampton Virginia USA Intelligent Control Autonomy Branch NASA Glenn Research Center Clevland Ohio USA

ISBN: (数字)9798350349610

ISBN: (纸本)9798350349627

关键词： NASA Batteries State of charge Aircraft propulsion Aircraft Usability Engines Turbines Aerospace control Airline industry

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Generating Realistic Arm Movements in Reinforcement Learning: A Quantitative Comparison of Reward Terms and Task Requirements

arXiv

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arXiv 2024年

作者： Charaja, Jhon P.F. Wochner, Isabell Schumacher, Pierre Ilg, Winfried Giese, Martin Maufroy, Christophe Bulling, Andreas Schmitt, Syn Martius, Georg Haeufle, Daniel F.B. Hertie Institute for Clinical Brain Research Centre for Integrative Neuroscience University of Tübingen Germany Heidelberg University Germany Max Planck Institute for Intelligent Systems Tübingen Germany University of Stuttgart Germany Germany Institute for Visualization and Interactive Systems University of Stuttgart Germany Institute for Modelling and Simulation of Biomechanical Systems University of Stuttgart Germany Department of Computer Science University of Tübingen Germany

Mimicking of human-like arm movement characteristics involves considering three factors during control policy synthesis: (a) task requirements, (b) noise during movement execution, and (c) optimality principles. Previous studies showed that when these factors (a-c) are considered individually, it is possible to synthesize arm movements that either kinematically match experimental data or reproduce the stereotypical triphasic muscle activation pattern. However, no quantitative comparison has assessed the realism of arm movements generated by each factor, nor has it been determined whether combining these factors results in movements with human-like kinematic characteristics and the triphasic muscle pattern. To investigate this, we used reinforcement learning to learn a control policy for a musculoskeletal arm model, aiming to discern which combination of factors (a-c) results in realistic arm movements according to four frequently reported stereotypical characteristics. Our findings indicate that incorporating velocity and acceleration requirements into the reaching task, employing reward terms that minimize mechanical work, hand jerk, and control effort, along with the inclusion of noise during movement, leads to realistic human arm movements by reinforcement learning. We expect that the gained insights will help in the future to better predict desired arm movements and corrective forces in wearable assistive devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Kinematics

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Generating Realistic Arm Movements in Reinforcement Learning: A Quantitative Comparison of Reward Terms and Task Requirements

Generating Realistic Arm Movements in Reinforcement Learning...

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IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob)

作者： Jhon P.F. Charaja Isabell Wochner Pierre Schumacher Winfried Ilg Martin Giese Christophe Maufroy Andreas Bulling Syn Schmitt Georg Martius Daniel F.B. Haeufle Hertie Institute for Clinical Brain Research and Centre for Integrative Neuroscience University of Tübingen Germany Institute of Computer Engineering (ZITI) Heidelberg University Germany Max Planck Institute for Intelligent Systems Tübingen Germany Institut for Industrial Manufacturing and Management (IFF) University of Stuttgart Germany Fraunhofer Institute for Manufacturing Engineering and Automation (IPA) Germany Institute for Visualization and Interactive Systems University of Stuttgart Germany Institute for Modelling and Simulation of Biomechanical Systems University of Stuttgart Germany Department of Computer Science University of Tübingen Germany

ISBN: (数字)9798350386523

ISBN: (纸本)9798350386530

关键词： Noise Reinforcement learning Kinematics Biomechatronics Muscles Manipulators Assistive devices Pattern matching

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Controlling the Error on Target Motion through Real-time Mesh Adaptation: Applications to Deep Brain Stimulation

arXiv

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arXiv 2017年

作者： Bui, Huu Phuoc Tomar, Satyendra Courtecuisse, Hadrien Audette, Michel Cotin, Stéphane Bordas, Stéphane P.A. Institute of Computational Engineering University of Luxembourg Faculty of Sciences Communication and Technology Luxembourg University of Strasbourg CNRS ICube Strasbourg France Department of Modeling Simulation and Visualization Engineering Old Dominion University Norfolk United States Inria Nancy-Grand Est Villers-lès-Nancy France Institute of Mechanics and Advanced Materials School of Engineering Cardiff University United Kingdom Intelligent Systems for Medicine Laboratory University of Western Australia Perth Australia

We present an error-controlled mesh refinement procedure for needle insertion simulation and apply it to the simulation of electrode implantation for deep brain stimulation, including brain shift. Our approach enables to control the error in the computation of the displacement and stress fields around the needle tip and needle shaft by suitably refining the mesh, whilst maintaining a coarser mesh in other parts of the domain. We demonstrate through academic and practical examples that our approach increases the accuracy of the displacement and stress fields around the needle without increasing the computational expense. This enables real-time simulations. The proposed methodology has direct implications to increase the accuracy and control the computational expense of the simulation of percutaneous procedures such as biopsy, brachytherapy, regional anesthesia, or cryotherapy and can be essential to the development of robotic guidance. Copyright © 2017, The Authors. All rights reserved.

关键词： Finite element method

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