| 1. |
- Hansson, Jörgen, et al.
(författare)
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Clearance of Flight Control Laws for Time-Varying Parameters
- 2003
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- In this article exponential stability of the closed loop for the Saab AB VEGAS model controlled by a gain-scheduled linear fractional transformation controller is investigated for time-varying Mach-number. The analysis is based on parameter-dependent Lyapunov-functions which are obtained by investigating feasibility of linear matrix inequalities.
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| 2. |
- Ståhl Gunnarsson, Karin, et al.
(författare)
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Clearance of Flight Control Laws using Linear Fractional Transformations
- 2004
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Ingår i: Proceedings of the 2004 AIAA Guidance, Navigation and Control Conference and Exhibit. - Reston, Virigina : American Institute of Aeronautics and Astronautics. - 9781624100734
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Konferensbidrag (refereegranskat)abstract
- The problem of flight clearance of linear stability requirements in the complete flight evelope is studied. The approach is to use mu-analysis of linear fractional transformations description of the system dynamics augmented with an uncertainty model of the clearance criteria. Two methods to derive the linear fractional transformations are used and compared: the Trends and Bands method and rational approximations. The two approaches are applied to a UAV demostrator model. The resulting models are analyzed by mu-sensitivites in order to demonstrate how this can be used to reduce the order of the linear fractional transformations description. A number of algorithms to compute upper and lower bounds on mu are also compared. Results from applying the clearance criteria to the UAV demonstrator model are given.
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| 3. |
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| 4. |
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| 5. |
- Brouwers, Lisa, et al.
(författare)
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MicroWorlds as a Tool for Policy Making
- 2001
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Konferensbidrag (refereegranskat)abstract
- The Hungarian government is experiencing escalating costs for ood mitigationmeasures and for economical compensation to victims. In a jointresearch project between the International Institute of Applied System Analysis(IIASA) in Austria, Computer and System Science Department (DSV)in Sweden, and the Hungarian Academy of Science, the ooding problem ofUpper Tisza in Hungary is investigated. A catastrophe simulation model hasbeen implemented, where dierent policy options are tested and evaluated.We investigate how the willingness to buy insurance aects the results onthe macro-level and on the micro-level.
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| 6. |
- Brouwers, Lisa, 1967-, et al.
(författare)
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Multi-criteria decision-making of policy strategies with public-private re-insurance systems
- 2004
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Ingår i: Risk, Decision, and Policy. - : Informa UK Limited. - 1357-5309 .- 1466-4534. ; 9:1, s. 23-45
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Tidskriftsartikel (refereegranskat)abstract
- This article describes an integrated flood catastrophe model as well as some results of a case study made in the Upper Tisza region in north-eastern Hungary: the Palad-Csecsei basin. The background data was provided through the Hungarian Academy of Sciences and complemented by interviews with different stakeholders in the region. Based on these data, for which a large degree of uncertainty is prevailing, we demonstrate how an implementation of a simulation and decision analytical model can provide insights into the effects of imposing different policy options for a flood risk management program in the region. We focus herein primarily on general options for designing a public-private insurance and reinsurance system for Hungary. Obviously, this is a multi-criteria and multi-stakeholder problem and cannot be solved using standard approaches. It should, however, be emphasised that the main purpose of this article is not to provide any definite recommendations, but rather to explore a set of policy packages that could gain a consensus among the stakeholders.
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| 7. |
- Brouwers, Lisa, 1967-, et al.
(författare)
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Simulation of Three Competing Flood Management Strategies : A Case Study
- 2002
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Ingår i: Proceedings of the Applied Simulation and Modelling (ASM). - Anaheim : actapress.
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Konferensbidrag (refereegranskat)abstract
- We argue that integrated catastrophe models are useful for policy decisions, for which a large degree of uncertainty is a natural ingredient. Recently, much attention has been given to the financial management of natural disasters. This article describes the results of a case study performed in northeastern Hungary where different flood manage ment strategies have been explored and compared using an integrated catastrophe model. The area used for the pilot study is the Palad-Csecsei basin (the Pilot basin) where 4 621 persons live. The Pilot basin is located in the Upper Tisza region. An executable and geographically explicit model has been developed, linking hydrological, geographical, financial, and social data. The outcomes of the policy simulations are represented at different granularity-levels; the individual, the aggregated (entire basin), and the governmental.
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| 8. |
- Collin, Sven-Olof, et al.
(författare)
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Explaining the choice of accounting standards in municipal corporations
- 2004
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Positive accounting theory (PAT) tries to explain corporations’ choices of accounting standards. Empirical research in this field has been focused on the choices made by large, listed corporations. We challenge this grounding through extending the empirical domain by testing PAT on Swedish municipal corporations. In order to be able to explain the choice of accounting standards in municipal corporations, PAT has to be complemented by institutional factors that can consider the forces of coercive, mimetic and normative pressures presented by the environment. The sample of municipal corporations showed that the choice of standards was significantly explained by both PAT factors and institutional factors. The conclusion is that municipal corporations tend to be subject to institutional influence by accepting the practice of their auditing firm and by using specific standards order to legitimise themselves when they have reached a certain size. Additionally, they tend to act according to PAT predictions by using those standards that are able to reduce the profit to levels that society deems acceptable for municipal corporations. Accordingly, through extending the empirical domain to municipal corporations, this paper’s contribution is to show that PAT needs the complementary institutional factors in order to be capable of explaining choice of accounting standards in firms.
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| 9. |
- Forslund, Ola, et al.
(författare)
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Population-based type-specific prevalence of high-risk human papillomavirus infection in middle-aged Swedish Women.
- 2002
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Ingår i: Journal of Medical Virology. - : Wiley. - 1096-9071 .- 0146-6615. ; 66:4, s. 535-541
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Tidskriftsartikel (refereegranskat)abstract
- Human papillomavirus (HPV) DNA testing can be used to identify women at risk of the development of cervical cancer. The cost-effectiveness of HPV screening is dependent on the type-specific HPV prevalence in the general population. The present study describes the prevalence and spectrum of high-risk HPV types found in a large real-life population-based HPV screening trial undertaken entirely within the cervical screening program offered to middle-aged Swedish women. Cervical brush samples from 6,123 women aged 32-38 years were analyzed using a general HPV primer (GP5(+)/6(+)) polymerase chain reaction-enzyme immunoassay (PCR-EIA) combined with reverse dot-blot hybridization for confirmation and HPV typing by a single assay. In this study, 6.8% (95% CI 6.2-7.5) (417/6,123) were confirmed as high-risk HPV positive. Infections with 13 different high-risk HPV types were detected, of which HPV 16 was the most prevalent type (2.1%; 128/6,123), followed by HPV 31 (1.1%; 67/6,123). Any one of the HPV types 18, 33, 35, 39, 45, 51, 52, 56, 58, 59, or 66 was detected in 3.6% (223/6,123) of the women. Infection with two, three, and five types simultaneously was identified in 32, 5, and 1 women, respectively. The combination of PCR-EIA as a screening test and reverse dot-blot hybridization as a confirmatory test, was found to be readily applicable to a real-life population-based cervical screening. The type-specific HPV prevalence found support in previous modeling studies suggesting that HPV screening may be a favorable cervical screening strategy.
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| 10. |
- Hansson, Christian, et al.
(författare)
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Hexafluorophosphates of chlorotris(dimethyl sulfide)platinum(II) and bromotris (dimethyl sulfide)platinum(II)
- 2003
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Ingår i: Acta Crystallographica. Section C: Crystal Structure Communications. - 0108-2701. ; 59:11, s. 432-434
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Tidskriftsartikel (refereegranskat)abstract
- The title compounds, chlorotris(dimethyl sulfide-kappaS)platinum(II) hexafluorophosphate, [PtCl(C2H6S)3]PF6, and bromotris(dimethyl sulfide-kappaS)platinum(II) hexafluorophosphate, [PtBr(C2H6S)3]PF6, are isomorphous and are composed of [PtX(dms)3]+ complex cations (X = Cl and Br, and dms is dimethyl sulfide) and PF6- anions. The Pt atom is coordinated by three S atoms and one X atom in a pseudo-square-planar coordination, with Pt-S distances in the range 2.293 (1)-2.319 (2) Å. Two dms ligands have a staggered conformation with respect to the coordination plane, while the third is rotated by ~90° compared with the orientation of the other two. The packing can be described as consisting of [PtX(dms)3]2(PF6)2 units with a centre of symmetry. In this description, the PtII atom has a pseudo-octahedral coordination, with four normal bonds and two long weak interactions. Density-functional theory calculations show that a conformation in which one dms ligand is not staggered is less favourable than having all three dms ligands staggered.
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