Search for dissertations about: "Christer Bäckström"

Showing result 1 - 5 of 6 swedish dissertations containing the words Christer Bäckström.

  2. 1. Reasoning about interdependent actions

    Author : Christer Bäckström; Linköpings universitet; []
    Keywords : HUMANITIES; HUMANIORA; HUMANIORA; HUMANITIES;

    Abstract : This thesis consists of two papers on different but related topics.The first paper is concerned with the use of logic as a tool to model mechanical assembly processes. READ MORE

  4. 2. Computational Complexity of some Optimization Problems in Planning

    Author : Meysam Aghighi; Peter Jonsson; Christer Bäckström; Hector Geffner; Linköpings universitet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : Automated planning is known to be computationally hard in the general case. Propositional planning is PSPACE-complete and first-order planning is undecidable. One method for analyzing the computational complexity of planning is to study restricted subsets of planning instances, with the aim of differentiating instances with varying complexity. READ MORE

  5. 3. Acute intermittent porphyria, women and sex hormones. Screening for hepatocellular carcinoma in porphyria

    Author : Eva Innala; Christer Andersson; Marie Bixo; Torbjörn Bäckström; Raili Kauppinen; Umeå universitet; []
    Keywords : MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Obstetrics and gynaecology; Obstetrik och gynekologi; obstetrik och gynekologi; Obstetrics and Gynaecology;

    Abstract : Background:   Porphyrias are inherited disorders with impaired heme biosynthesis. Acute intermittent porphyria (AIP) is the most common porphyria in Sweden. AIP attacks may be life-threatening. Female sex hormones are regarded as important precipitating factors. READ MORE

  6. 4. Strong Partial Clones and the Complexity of Constraint Satisfaction Problems : Limitations and Applications

    Author : Victor Lagerkvist; Peter Jonsson; Christer Bäckström; Nadia Creignou; Linköpings universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : In this thesis we study the worst-case time complexity of the constraint satisfaction problem parameterized by a constraint language (CSP(S)), which is the problem of determining whether a conjunctive formula over S has a model. To study the complexity of CSP(S) we borrow methods from universal algebra. READ MORE

  7. 5. Methods for Detecting Unsolvable Planning Instances using Variable Projection

    Author : Simon Ståhlberg; Peter Jonsson; Christer Bäckström; Malte Helmert; Linköpings universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : In this thesis we study automated planning, a branch of artificialintelligence, which deals with construction of plans. A plan is typically an action sequence that achieves some specific goal. In particular, we study unsolvable planning instances, i.e. READ MORE