| 1. |
- Frisk, Erik, 1971-, et al.
(författare)
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A toolbox for design of diagnosis systems
- 2006
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Ingår i: IFAC Safeprocess06,2006. - Beijing, China : IFAC. ; , s. 703-
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Konferensbidrag (refereegranskat)abstract
- Design of diagnosis systems is a complex task that involves many different steps. Full understanding of all different parts of the design procedure requires deep knowledge on theory from a wide variety of subjects. Thus, to encourage the use of results from diagnosis research it is highly desirable to have software support in the design process. This paper describes ongoing work for determining an architecture for such a toolbox. The paper also describes software solutions in the toolbox. In industry as well as in universities, Matlab is probably the most widespread tool used by control engineers. Therefore the toolbox is primarily based upon Matlab but also some computer algebraic tools such as Mathematica and Maple are used.
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| 2. |
- Krysander, Mattias, 1977-, et al.
(författare)
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An Efficient Algorithm for Finding Minimal Overconstrained Subsystems for Model-Based Diagnosis
- 2008
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Ingår i: IEEE transactions on systems, man and cybernetics. Part A. Systems and humans. - 1083-4427 .- 1558-2426. ; 38:1, s. 197-206
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Tidskriftsartikel (refereegranskat)abstract
- In model based diagnosis, the diagnostic system construction is based on a model of the technical system to be diagnosed. To handle large differential algebraic models and to achieve fault isolation, a common strategy is to pick out small over-constrained parts of the model and to test these separately against measured signals. A new algorithm for computing all minimal over-constrained sub-systems in a model is proposed. For complexity comparison, previous algorithms are recalled. It is shown that the time complexity under certain conditions is much better for the new algorithm. This is illustrated using a truck engine model.
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| 3. |
- Krysander, Mattias, 1977-, et al.
(författare)
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An Efficient Algorithm for Finding Over-constrained Sub-systems for Construction of Diagnostic Tests
- 2005
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Ingår i: 16th International Workshop on Principles of Diagnosis DX-05,2005. - Pacific Grove, California, USA. ; , s. 55-60
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Konferensbidrag (refereegranskat)abstract
- In this paper, a new algorithm for computing all minimal over-constrained sub-systems in a structural model is proposed. To handle large differential algebraic models in diagnosis, systematic structural approaches to find testable sub-systems have been suggested. It is shown how the algorithm can be incorporated and improve some of them. Previous algorithms are recalled and it is shown that the new algorithm is 14000 times faster when applied to a Scania truck engine model.
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| 6. |
- Biteus, Jonas, 1977-, et al.
(författare)
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Determining the Fault Status of a Component and its Readiness, with a Distributed Automotive Application
- 2009
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Ingår i: Engineering applications of artificial intelligence. - : Elsevier BV. - 0952-1976 .- 1873-6769. ; 22:3, s. 363-373
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Tidskriftsartikel (refereegranskat)abstract
- In systems using only single-component tests, the fault status of a component is ready if a test only supervising the component has been evaluated. However, if plausibility tests that supervise multiple components are used, then a component can be ready before all tests supervising the component have been evaluated. Based on test results, this paper contributes with conditions on when a component is ready. The conditions on readiness are given for both centralized and distributed systems and are here applied to the distributed diagnostic system in an automotive vehicle.
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| 9. |
- Engdahl, Mattias, et al.
(författare)
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Förlorad tid eller förberedelser för integration?
- 2022
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Vi studerar om handläggningstiden för asylärenden påverkar integration och hälsa. Den empiriska analysen bygger på registerdata och utnyttjar en snabb ökning av handläggningstider för asylsökande till Sverige under 2014. Vi finner att längre väntan innan uppehållstillstånd bromsar integrationsprocessen. Arbetsinkomsterna under de första fyra åren efter ansökan är 2,3 procent lägre per extra handläggningsmånad. Effekten tycks bero på förseningar snarare än negativa effekter av väntan i sig. De som väntar längre kommer igång senare med centrala etableringsinsatser och har kommit kortare i integrationsprocessen. Vi hittar inga tecken på att handläggningstiden påverkar asylsökandes hälsa negativt. Bland personer som haft uppehållstillstånd lika länge vid mättidpunkten presterar de som väntat längre bättre på arbetsmarknaden och tar del av mer avancerad språkutbildning och arbetsnära insatser som subventionerade anställningar. Detta pekar på att delar av integrationsprocessen inleds redan innan uppehållstillstånd beviljas.
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| 10. |
- Engdahl, Mattias, 1982-
(författare)
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International Mobility and the Labor Market
- 2013
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis consists of four self-contained essays.Essay 1 (with Olof Åslund): We study the labor market impact of opening borders to low-wage countries. The analysis exploits time and regional variation provided by the 2004 EU enlargement in combination with transport links to Sweden from the new member states. The results suggest an adverse impact on earnings of present workers in the order of 1 percent in areas close to pre-existing ferry lines. The effects are present in most segments of the labor market but tend to be greater in groups with weaker positions. The impact is also clearer in industries which have received more workers from the new member states, and for which across-the-border work is likely to be more common. There is no robust evidence on an impact on employment or wages. At least part of the effects is likely due to channels other than the ones typically considered in the literature. Essay 2: I study demand shifting effects of real exchange rate movements in border regions. Detailed geographic information on border crossings, the location of retail outlets, and where the population resides, allows me to explore the labor market effects of cross-border shopping. The impact is identified by comparing areas located close to the border with more remote areas. The relative effects are large; a ten percent decline in the value of the Swedish krona is followed by an increase in the number of employees in the retail industry by 3 percent. Similarly, the share of the population employed in retail increases by 0.3 percentage points and annual earnings by 2.7 percent.Essay 3 (with Olof Åslund): We study the effects of performance bonuses in immigrant language training for adults. A Swedish policy pilot conducted in 2009–2010 gave a randomly assigned group of municipalities the right to grant substantial cash bonuses to recently arrived migrants. The results suggest substantial effects on average student achievement. But these were fully driven by metropolitan areas; in other parts of Sweden average performance was more or less unaffected. In line with theory, effects tend to be clearer where institutional features make the bonus more feasible, or where student characteristics suggest that the costs should be lower.Essay 4: I study the association between naturalizations, labor market outcomes and family formation. The results show that the economic outcomes of immigrants from outside the OECD, on average, improve following naturalization. A strict causal interpretation of the results is not possible as the outcomes start to improve already before the acquisition of citizenship. The study also shows that for migrants from some country groups there is a positive correlation between naturalizations and the likelihood of getting married and having children. This is suggestive of immigrants naturalizing for family reasons. Further, my findings illustrate that modeling assumptions are of great importance. Models that are not flexible enough could lead to false claims regarding causality.
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