Spelling suggestions: "subject:"matematiska.""
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The Laplacian in its different guisesTegby, Oskar January 2019 (has links)
No description available.
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The mathematical justification of the Leontief and Sraffa input-output systemsLaurent, Sofie January 2018 (has links)
No description available.
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The Happy Ending Problem and its connection to Ramsey theoryFreyland, Sara January 2019 (has links)
No description available.
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Markov Chains, Renewal, Branching and Coalescent Processes : Four Topics in Probability TheoryNordvall Lagerås, Andreas January 2007 (has links)
<p>This thesis consists of four papers.</p><p>In paper 1, we prove central limit theorems for Markov chains under (local) contraction conditions. As a corollary we obtain a central limit theorem for Markov chains associated with iterated function systems with contractive maps and place-dependent Dini-continuous probabilities.</p><p>In paper 2, properties of inverse subordinators are investigated, in particular similarities with renewal processes. The main tool is a theorem on processes that are both renewal and Cox processes.</p><p>In paper 3, distributional properties of supercritical and especially immortal branching processes are derived. The marginal distributions of immortal branching processes are found to be compound geometric.</p><p>In paper 4, a description of a dynamic population model is presented, such that samples from the population have genealogies as given by a Lambda-coalescent with mutations. Depending on whether the sample is grouped according to litters or families, the sampling distribution is either regenerative or non-regenerative.</p>
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Statistical methods for knowledge discovery in adverse drug reaction surveillanceNorén, G. Niklas January 2007 (has links)
<p>Collections of individual case safety reports are the main resource for early discovery of unknown adverse reactions to drugs once they have been introduced to the general public. The data sets involved are complex and based on voluntary submission of reports, but contain pieces of very important information. The aim of this thesis is to propose computationally feasible statistical methods for large-scale knowledge discovery in these data sets. The main contributions are a duplicate detection method that can reliably identify pairs of unexpectedly similar reports and a new measure for highlighting suspected drug-drug interaction.</p><p>Specifically, we extend the hit-miss model for database record matching with a hit-miss mixture model for scoring numerical record fields and a new method to compensate for strong record field correlations. The extended hit-miss model is implemented for the WHO database and demonstrated to be useful in real world duplicate detection, despite the noisy and incomplete information on individual case safety reports. The Information Component measure of disproportionality has been in routine use since 1998 to screen the WHO database for excessive adverse drug reaction reporting rates. Here, it is further refined. We introduce improved credibility intervals for rare events, post-stratification adjustment for suspected confounders and an extension to higher order associations that allows for simple but robust screening for potential risk factors. A new approach to identifying reporting patterns indicative of drug-drug interaction is also proposed. Finally, we describe how imprecision estimates specific to each prediction of a Bayes classifier may be obtained with the Bayesian bootstrap. Such case-based imprecision estimates allow for better prediction when different types of errors have different associated loss, with a possible application in combining quantitative and clinical filters to highlight drug-ADR pairs for clinical review.</p>
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Matematisk modell av genuttrycket i Escherichia coli under kolhydratsvält.Skoog, Lisa January 2010 (has links)
<p>Då bakterier utsätts för stress så som kolhydratsvält ändras genuttrycket för att öka organismens chanser att överleva. Det finns inte tillräckligt mycket exerimentiell data om dessa förlopp så för att öka kunskaperna inom detta område kan matema- tiska modeller ställas upp. Tre matematiska modeller har gjorts som simulerar detta förlopp. De parametrar som ingår är koncentrationen av Crp, Cya, Fis, GyrAB, To- pA och stabilt RNA (Rrn). Resultaten har jämförts med resultat från två artiklar (Ropers et al, 2006, Porreca et al, 2008) som utgör grunden för detta arbete. Inga direkta förbättringar har gjorts, dock finns förslag på hur detta skulle kunna göras.</p>
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Analys av ledtid för volymprodukter till en nyckelkund hos Fredriksons Verkstads AB.Johansson, Frida January 2010 (has links)
No description available.
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Spectral theory of random operators : The energy spectrum of the quantum electron in a disordered solidTaraldsen, Gunnar January 1992 (has links)
No description available.
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Urenheter i en-dimensjonale krystallerTaraldsen, Gunnar January 1988 (has links)
No description available.
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Utvärdering av ett optimeringsprogram för produktionsplaneringSmedh, Hanna January 2009 (has links)
<p>Målet med detta examensarbete är att utvärdera det program, baserat på dynamisk programmering, som tidigare skrivits för att efterlikna TSS:s produktionsplanering. Till att börja med återfinns i arbetet ett kapitel om programmets uppbyggnad, en kortare beskrivning av vart och ett av delprogrammen samt en förteckning över in- och utdata i respektive program. DP-programmet består av 6 sammankopplade exekverbara m-filer som tillsammans räknar ut den optimerade produktionsplaneringen för var och en av planeringsgrupperna. Programmet läser in och formaterar om data och optimerar sedan produktionen för var och en av artiklarna i en planeringsgrupp. Till sist sätter programmet ihop planeringsgruppens alla artikelplaneringar och får då ut ett produktionsalternativ. När genomgången av programmet var klar återstod körningar på nya data. För att få tillgång till dessa nya data gjordes ett besök hos TSS och efter detta utfördes körningar på den kommande periodens planerade tillverkning. Resultatet från dessa körningar visar, likt tidigare resultat, på att man skulle kunna minska sina kostnader ganska rejält genom att dra ner på lagerhållningen. Överlag skulle man enligt programmet kunna minska sina kostnader med drygt 50 %, vilket ändå måste anses som en rejäl vinst.</p> / <p>The aim of this thesis is benchmarking of the program, based on dynamic programming, that earlier was written to imitate the production planning at TSS. This thesis starts with a chapter about the construction of the DP-program, a shorter description of one and each of the program parts and also a list over the in- and output data in each program part. The DP-program consists of six linked MATLAB-files that together produce an optimized production plan for the different planning groups at TSS. The program reads in and reformat the given data and optimize the production of the articles in one group. Finally it compounds all article production plans and give us a production alternative. After running the program with new data the result shows, resembling with previous results, that TSS could be able to make some distinct cost-savings. According to the program, a 50 % decrease of TSS production costs is possible.</p>
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