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Auflistung nach Autor:in "Nebel, Bernhard"

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  • Zeitschriftenartikel
    AI Approaches to Cognitive Systems – The Example of Spatial Cognition
    (Informatik-Spektrum: Vol. 34, No. 5, 2011) Nebel, Bernhard; Freksa, Christian
    Cognitive abilities can be studied by observing and interpreting natural systems or by developing artificial systems that interact with their environments in intelligent ways. Cognitive systems research connects both approaches. Typically, human requirements are in the focus of interest and systems are developed to interact with humans in as natural a way as possible. To achieve this goal, a deep understanding of human cognition is required. The present paper focuses on spatial cognition, i. e. the ability to perceive and conceive spatial environments and solve spatial tasks intelligently. It discusses artificial intelligence approaches to spatial cognition for supporting human activities.
  • Konferenzbeitrag
    Automatic planning: Making autonomous behavior possible
    (INFORMATIK 2013 – Informatik angepasst an Mensch, Organisation und Umwelt, 2013) Nebel, Bernhard
    If an autonomous robot, car, or spacecraft has to decide on the course of action it is going to take, it has to anticipate the effects of its actions and chose them asccordingly. The research area on Automatic Planning is concerned with precisely this problem. In the last fifteen years, a number of significant advances have been made that have boosted the practical efficiency of planning methods and their applicability in, e.g., robotics. This talk will sketch these developments and point out some of the challenges we are facing today.
  • Zeitschriftenartikel
    Cognitive Space and Spatial Cognition: The SFB/TR 8 Spatial Cognition
    (KI - Künstliche Intelligenz: Vol. 30, No. 1, 2016) Ragni, Marco; Barkowsky, Thomas; Nebel, Bernhard; Freksa, Christian
    Space and time are two of the most fundamental categories any human, animal, or other cognitive agent such as an autonomous robot has to deal with. They need to perceive their environments, make sense of their perceptions, and make interactions as embodied entities with other agents and their environment. The theoretical foundations and practical implications have been investigated from a cognitive perspective (i.e., from an information processing point of view) within the Sonderforschungsbereich/Transregio SFB/TR 8 Spatial Cognition (http://www.sfbtr8.spatial-cognition.de) over the past 12 years jointly by the Universities of Bremen and Freiburg. The research covered fundamental questions: what are the specific requirements of reasoning about space and time, for acting in space, and for any form of interaction including communication in spatio-temporal domains? It has been a success story in all research lines from foundational research to applications of spatial cognition in robotics, interaction and communication. The SFB/TR 8 actually shaped a new research field by extending a previous subfield of cognitive science with its own interdisciplinary techniques.
  • Zeitschriftenartikel
    Platas—Integrating Planning and the Action Language Golog
    (KI - Künstliche Intelligenz: Vol. 26, No. 1, 2012) Claßen, Jens; Röger, Gabriele; Lakemeyer, Gerhard; Nebel, Bernhard
    Action programming languages like Golog allow to define complex behaviors for agents on the basis of action representations in terms of expressive (first-order) logical formalisms, making them suitable for realistic scenarios of agents with only partial world knowledge. Often these scenarios include sub-tasks that require sequential planning. While in principle it is possible to express and execute such planning sub-tasks directly in Golog, the system can performance-wise not compete with state-of-the-art planners. In this paper, we report on our efforts to integrate efficient planning and expressive action programming in the Platas project. The theoretical foundation is laid by a mapping between the planning language Pddl and the Situation Calculus, which is underlying Golog, together with a study of how these formalisms relate in terms of expressivity. The practical benefit is demonstrated by an evaluation of embedding a Pddl planner into Golog, showing a drastic increase in performance while retaining the full expressiveness of Golog.
  • Zeitschriftenartikel
  • Zeitschriftenartikel
    Tischfußball: Mensch versus Computer
    (Informatik-Spektrum: Vol. 31, No. 4, 2008) Weigel, Thilo; Nebel, Bernhard
    Tischfußball ist wesentlich einfacher als richtiger Fußball. Als Domäne für Roboter hat man aber die gleichen Herausforderungen wie in anderen Domänen. Sensoren geben verrauschte Werte, Aktionen müssen unter Zeitdruck ausgewählt werden und ihre Ausführung ist im Allgemeinen nicht perfekt. KiRo und StarKick sind zwei Systeme, die gebaut wurden, um Tischfußball gegen Menschen zu spielen. Sie sind die ersten Systeme, die existierende, physikalische Spiele gegen Menschen spielen können und dabei auf einem vergleichsweise hohen Niveau spielen. Daneben eignen sie sich dazu, verschiedene KI-Methoden im Kontext zu evaluieren, z.B. Aktionsselektionsmethoden, wie im Papier gezeigt wird.