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Planning in Inhabited Environments: Human-Aware Task Planning and Activity Recognition
Örebro University, School of Science and Technology. (Mobile Robotics Lab)
2010 (English)Doctoral thesis, monograph (Other academic)
Abstract [en]

Promised some decades ago by researchers in artificial intelligence and robotics as an imminent breakthrough in our everyday lives, a robotic assistant that could work with us in our home and our workplace is a dream still far from being fulfilled. The work presented in this thesis aims at bringing this future vision a little closer to realization. Here, we start from the assumption that an efficient robotic helper should not impose constraints on users' activities, but rather perform its tasks unobtrusively to fulfill its goals and to facilitate people in achieving their objectives.  Also, the helper should be able to consider the outcome of possible future actions by the human users, to assess how those would affect the environment with respect to the agent's objectives, and to predict when its support will be needed. In this thesis we address two highly interconnected problems that are essential for the cohabitation of people and service robots: robot task planning and human activity recognition. First, we present human-aware planning, that is, our approach to robot high-level symbolic reasoning for plan generation. Human-aware planning can be applied in situations where there is a controllable agent, the robot, whose actions we can plan, and one or more uncontrollable agents, the human users, whose future actions we can only try to predict. In our approach, therefore, the knowledge of the users' current and future activities is an important prerequisite. We define human-aware as a new type of planning problem, we formalize the extensions needed by a classical planner to solve such a problem, and we present the implementation of a planner that satisfies all identified requirements. In this thesis we explore also a second issue, which is a prerequisite to the first one: human activity monitoring in intelligent environments. We adopt a knowledge driven approach to activity recognition, whereby a constraint-based domain description is used to correlate sensor readings to human activities. We validate our solutions to both human-aware planning and activity recognition both theoretically and experimentally, describing a number of explanatory examples and test runs in a real environment.

Place, publisher, year, edition, pages
Örebro: Örebro university , 2010. , 127 p.
Series
Örebro Studies in Technology, ISSN 1650-8580 ; 42
Keyword [en]
Human-aware planning, planning under uncertainty, activity recognition
National Category
Engineering and Technology Computer and Information Science Computer Science
Research subject
Computer and Systems Science
Identifiers
URN: urn:nbn:se:oru:diva-12466ISBN: 978-91-7668-756-7 (print)OAI: oai:DiVA.org:oru-12466DiVA: diva2:370049
Public defence
2010-12-14, Hörsal T, Örebro universitet, 701 82 Örebro, 13:00 (English)
Opponent
Supervisors
Available from: 2010-11-15 Created: 2010-11-15 Last updated: 2017-10-17Bibliographically approved

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