| 1. |
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| 2. |
- Andreasson, Henrik, 1977-, et al.
(författare)
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Autonomous transport vehicles : where we are and what is missing
- 2015
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Ingår i: IEEE robotics & automation magazine. - 1070-9932 .- 1558-223X. ; 22:1, s. 64-75
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Tidskriftsartikel (refereegranskat)abstract
- In this article, we address the problem of realizing a complete efficient system for automated management of fleets of autonomous ground vehicles in industrial sites. We elicit from current industrial practice and the scientific state of the art the key challenges related to autonomous transport vehicles in industrial environments and relate them to enabling techniques in perception, task allocation, motion planning, coordination, collision prediction, and control. We propose a modular approach based on least commitment, which integrates all modules through a uniform constraint-based paradigm. We describe an instantiation of this system and present a summary of the results, showing evidence of increased flexibility at the control level to adapt to contingencies.
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| 3. |
- Bergsten, Pontus, 1971-, et al.
(författare)
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Fuzzy Observers
- 2001
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Ingår i: The 10th IEEE International Conference on Fuzzy Systems (Volym:3). - New York, USA : IEEE conference proceedings. - 078037293X ; , s. 700-703
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Konferensbidrag (refereegranskat)abstract
- We consider the analysis and design of three different types of nonlinear observers for dynamic Takagi-Sugeno fuzzy systems. Our approach is based on extending existing nonlinear observer schemes, namely Thau-Luenberger and sliding mode observers, to the case of interpolated multiple local affine linear models. Then linear matrix inequality based techniques are used for observer analysis and design.
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| 4. |
- Bergsten, Pontus, 1971-, et al.
(författare)
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Observers for Takagi-Sugeno fuzzy systems
- 2002
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Ingår i: IEEE transactions on systems, man and cybernetics. Part B. Cybernetics. - : IEEE Journals & Magazines. - 1083-4419 .- 1941-0492. ; 32:1, s. 114-121
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Tidskriftsartikel (refereegranskat)abstract
- We focus on the analysis and design of two different sliding mode observers for dynamic Takagi-Sugeno (TS) fuzzy systems. A nonlinear system of this class is composed of multiple affine local linear models that are smoothly interpolated by weighting functions resulting from a fuzzy partitioning of the state space of a given nonlinear system subject to observation. The Takagi-Sugeno fuzzy system is then an accurate approximation of the original nonlinear system. Our approach to the analysis and design of observers for Takagi-Sugeno fuzzy systems is based on extending sliding mode observer schemes to the case of interpolated multiple local affine linear models. Thus, our main contribution is nonlinear observer analysis and design methods that can effectively deal with model/plant mismatches. Furthermore, we consider the difficult case when the weighting functions in the Takagi-Sugeno fuzzy system depend on the estimated state
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| 5. |
- Doherty, Patrick, 1957-, et al.
(författare)
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A non-monotonic fuzzy logic.
- 1991
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Ingår i: International Fuzzy Systems Association, Fourth World Congress,1991.
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Konferensbidrag (refereegranskat)
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| 6. |
- Doherty, Patrick, 1957-, et al.
(författare)
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Fuzzy if-then-unless rules and their implementation.
- 1992
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Ingår i: International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems, IPMU92,1992. - Linköping, Sweden : Springer.
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Konferensbidrag (refereegranskat)
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| 7. |
- Doherty, Patrick, 1957-, et al.
(författare)
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Fuzzy if-then-unless rules and their implementation
- 1993
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Ingår i: International Journal of Uncertainty Fuzziness and Knowledge-Based Systems. - : World Scientific. - 0218-4885. ; 1:2, s. 167-182
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Tidskriftsartikel (refereegranskat)abstract
- We consider the possibility of generalizing the notion of a fuzzy If-Then rule to take into account its context dependent nature. We interpret fuzzy rules as modeling a forward directed causal relationship between the antecedent and the conclusion, which applies in most contexts, but on occasion breaks down in exceptional contexts. The default nature of the rule is modeled by augmenting the original If-Then rule with an exception part. We then consider the proper semantic correlate to such an addition and propose a ternary relation which satisfies a number of intuitive constraints described in terms of a number of inference rules. In the rest of the paper, we consider implementational issues arising from the unless extension and propose the use of reason maintenance systems, in particular TMS's, where a fuzzy If-Then-Unless rule is encoded into a dependency net. We verify that the net satisfies the constraints stated in the inference schemes and conclude with a discussion concerning the integration of qualitative IN-OUT labelings of the TMS with quantitative degree of membership labelings for the variables in question.
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| 8. |
- Doherty, Patrick, 1957-, et al.
(författare)
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Nonmonotonicity, fuzziness, and multi-values.
- 1993
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Ingår i: Fuzzy Logic: State of the Art. Series D: System Theory, Knowledge Engineering and Problem Solving.. - Dordrecht ; Boston : Kluwer Academic Publishers. - 0792323246 - 9780792323242
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
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| 9. |
- Doherty, Patrick, 1957-, et al.
(författare)
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Nonmonotonicity, fuzziness, and multi-values.
- 1993
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Ingår i: Fuzzy Logic: State of the Art. Series D: System Theory, Knowledge Engineering and Problem Solving.. - Dordrecht ; Boston : Kluwer Academic Publishers. - 0792323246 - 9780792323242
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
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| 10. |
- Doherty, Patrick, 1957-, et al.
(författare)
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Partial logics and partial preferences.
- 1992
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Ingår i: International Conference on Economics/Management and Information Technology,1992. ; , s. 525-
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Konferensbidrag (refereegranskat)
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