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Documents authored by Tompits, Hans

Document
DOI: 10.4230/OASIcs.ASD.2020.1
Towards a Reliable and Context-Based System Architecture for Autonomous Vehicles

Authors: Tobias Kain, Philipp Mundhenk, Julian-Steffen Müller, Hans Tompits, Maximilian Wesche, and Hendrik Decke

Published in: OASIcs, Volume 79, 2nd International Workshop on Autonomous Systems Design (ASD 2020)

Abstract
Full vehicle autonomy excludes a takeover by passengers in case a safety-critical application fails. Therefore, the system responsible for operating the autonomous vehicle has to detect and handle failures autonomously. Moreover, this system has to ensure the safety of the passengers, as well as the safety of other road users at any given time. Especially in the initial phase of autonomous vehicles, building up consumer confidence is essential. Therefore, in this regard, handling all failures by simply performing an emergency stop is not desirable. In this paper, we introduce an approach enabling a dynamic and safe reconfiguration of the autonomous driving system to handle occurring hardware and software failures. Since the requirements concerning safe reconfiguration actions are significantly affected by the current context the car is experiencing, the developed reconfiguration approach is sensitive to context changes. Our approach defines three interconnected layers, which are distinguished by their level of awareness. The top layer, referred to as the context layer, is responsible for observing the context. These context observations, in turn, imply a set of requirements, which constitute the input for the reconfiguration layer. The latter layer is required to determine reconfiguration actions, which are then executed by the architecture layer.
Cite as

Tobias Kain, Philipp Mundhenk, Julian-Steffen Müller, Hans Tompits, Maximilian Wesche, and Hendrik Decke. Towards a Reliable and Context-Based System Architecture for Autonomous Vehicles. In 2nd International Workshop on Autonomous Systems Design (ASD 2020). Open Access Series in Informatics (OASIcs), Volume 79, pp. 1:1-1:7, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{kain_et_al:OASIcs.ASD.2020.1,
  author =	{Kain, Tobias and Mundhenk, Philipp and M\"{u}ller, Julian-Steffen and Tompits, Hans and Wesche, Maximilian and Decke, Hendrik},
  title =	{{Towards a Reliable and Context-Based System Architecture for Autonomous Vehicles}},
  booktitle =	{2nd International Workshop on Autonomous Systems Design (ASD 2020)},
  pages =	{1:1--1:7},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-141-2},
  ISSN =	{2190-6807},
  year =	{2020},
  volume =	{79},
  editor =	{Steinhorst, Sebastian and Deshmukh, Jyotirmoy V.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.ASD.2020.1},
  URN =		{urn:nbn:de:0030-drops-125956},
  doi =		{10.4230/OASIcs.ASD.2020.1},
  annote =	{Keywords: autonomous driving, fail-operational systems, context-based architecture, application placement, optimization, monitoring}
}
Document
DOI: 10.4230/LIPIcs.ICLP.2012.222
An FLP-Style Answer-Set Semantics for Abstract-Constraint Programs with Disjunctions

Authors: Johannes Oetsch, Jörg Pührer, and Hans Tompits

Published in: LIPIcs, Volume 17, Technical Communications of the 28th International Conference on Logic Programming (ICLP'12) (2012)

Abstract
We introduce an answer-set semantics for abstract-constraint programs with disjunction in rule heads in the style of Faber, Leone, and Pfeifer (FLP). To this end, we extend the definition of an answer set for logic programs with aggregates in rule bodies using the usual FLP-reduct. Additionally, we also provide a characterisation of our semantics in terms of unfounded sets, likewise generalising the standard concept of an unfounded set. Our work is motivated by the desire to have simple and rule-based definitions of the semantics of an answer-set programming (ASP) language that is close to those implemented by the most prominent ASP solvers. The new definitions are intended as a theoretical device to allow for development methods and methodologies for ASP, e.g., debugging or testing techniques, that are general enough to work for different types of solvers. We use abstract constraints as an abstraction of literals whose truth values depend on subsets of an interpretation. This includes weight constraints, aggregates, and external atoms, which are frequently used in real-world answer-set programs. We compare the new semantics to previous semantics for abstract-constraint programs and show that they are equivalent to recent extensions of the FLP semantics to propositional and first-order theories when abstract-constraint programs are viewed as theories.
Cite as

Johannes Oetsch, Jörg Pührer, and Hans Tompits. An FLP-Style Answer-Set Semantics for Abstract-Constraint Programs with Disjunctions. In Technical Communications of the 28th International Conference on Logic Programming (ICLP'12). Leibniz International Proceedings in Informatics (LIPIcs), Volume 17, pp. 222-234, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2012)

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@InProceedings{oetsch_et_al:LIPIcs.ICLP.2012.222,
  author =	{Oetsch, Johannes and P\"{u}hrer, J\"{o}rg and Tompits, Hans},
  title =	{{An FLP-Style Answer-Set Semantics for Abstract-Constraint Programs with Disjunctions}},
  booktitle =	{Technical Communications of the 28th International Conference on Logic Programming (ICLP'12)},
  pages =	{222--234},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-43-9},
  ISSN =	{1868-8969},
  year =	{2012},
  volume =	{17},
  editor =	{Dovier, Agostino and Santos Costa, V{\'\i}tor},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICLP.2012.222},
  URN =		{urn:nbn:de:0030-drops-36246},
  doi =		{10.4230/LIPIcs.ICLP.2012.222},
  annote =	{Keywords: answer-set programming, abstract constraints, aggregates, disjunction}
}
Document
DOI: 10.4230/LIPIcs.ICLP.2010.154
Methods and Methodologies for Developing Answer-Set Programs - Project Description

Authors: Johannes Oetsch, Jörg Pührer, and Hans Tompits

Published in: LIPIcs, Volume 7, Technical Communications of the 26th International Conference on Logic Programming (2010)

Abstract
Answer-set programming (ASP) is a well-known formalism for declarative problem solving, enjoying a continuously increasing number of diverse applications. However, arguably one of the main challenges for a wider acceptance of ASP is the need of tools, methods, and methodologies that support the actual programming process. In this paper, we review the main goals of a project, funded by the Austrian Science Fund (FWF), which aims to address this aspect in a systematic manner. The project is planned for a duration of three years and started in September 2009. Generally, the focus of research will be on methodologies for systematic program development, program testing, and debugging. In particular, in working on these areas, special emphasis shall be given to the ability of the developed techniques to respect the declarative nature of ASP. To support a sufficient level of usability, solutions are planned to be compatible not only for the core language of ASP but also for important extensions thereof that are commonly used and realised in various answer-set solvers. Ultimately, the methods resulting from the project shall form the basis of an integrated development environment (IDE) for ASP that is envisaged to combine straightforward as well as advanced techniques, realising a convenient tool for developing answer-set programs.
Cite as

Johannes Oetsch, Jörg Pührer, and Hans Tompits. Methods and Methodologies for Developing Answer-Set Programs - Project Description. In Technical Communications of the 26th International Conference on Logic Programming. Leibniz International Proceedings in Informatics (LIPIcs), Volume 7, pp. 154-161, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)

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@InProceedings{oetsch_et_al:LIPIcs.ICLP.2010.154,
  author =	{Oetsch, Johannes and P\"{u}hrer, J\"{o}rg and Tompits, Hans},
  title =	{{Methods and Methodologies for Developing Answer-Set Programs - Project Description}},
  booktitle =	{Technical Communications of the 26th International Conference on Logic Programming},
  pages =	{154--161},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-17-0},
  ISSN =	{1868-8969},
  year =	{2010},
  volume =	{7},
  editor =	{Hermenegildo, Manuel and Schaub, Torsten},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICLP.2010.154},
  URN =		{urn:nbn:de:0030-drops-25937},
  doi =		{10.4230/LIPIcs.ICLP.2010.154},
  annote =	{Keywords: Answer-set programming, program development, testing, debugging}
}
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