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  • 201.
    Niedderer, H.
    et al.
    Mälardalen University, School of Education, Culture and Communication. Mälardalen University, Department of Mathematics and Physics.
    Sander, F.
    Goldberg, F.
    Otero, V.
    Jorde, D.
    Slotta, J.
    Strømme, A.
    Fischer, H. E.
    Hucke, L.
    Tiberghien, A.
    Vince, J.
    Research about the Use of Information Technology in Science Education2003In: Science Education in the Knowledge-Based Society, Kluwer Academic Publishers, Dordrecht , 2003, p. 309-322Chapter in book (Refereed)
    Abstract [en]

    In this paper, we investigate some aspects of effectiveness in two different kinds of learning environments with use of information technology. The first part shows research results related to a web-based integrated science environment (WISE) and its effects on changing the role of the teacher, the curriculum, and the student. In the second part, three different approaches for scaffolding conceptual development in physics by using interactive computer models are analysed. Research results about different aspects of their effectiveness are presented. Both parts together show empirical results in relation to different promising approaches of using information technology in science education.

  • 202.
    Niedderer, Hans
    et al.
    Mälardalen University, School of Education, Culture and Communication. Mälardalen University, Department of Mathematics and Physics.
    Budde, Marion
    Givry, Damien
    Psillos, Dimitris
    Tiberghien, Andree
    Learning process studies2007In: Contributions from Science Education Research / [ed] R. Pinto, Springer, The Netherlands , 2007, p. 159-171Chapter in book (Other (popular science, discussion, etc.))
    Abstract [en]

    Learning processes will be analysed as “evolution of student’s ideas” or as “conceptual change” on a timescale of several hours. The idea is to follow a single student’s constructions “during” the whole process of learning in more detail, including analyses of learning effects. The paper in part two discusses theoretical and methodological issues of such learning process studies. Here, the focus is on the unit of analysis (expressed ideas or conceptions) and on the relation between teaching and learning. In part three, a more recent study about the evolution of students’ ideas about gases is presented, describing learning by using three categories: A student expresses a new idea, a student increases the domain of validity of an idea, or a student establishes a link between several ideas and develops a network. In part four, another more recent study about analysing learning effects of the learning environment on single students learning is presented. Here, different types of resonances are used as categories, e.g. congruent or disgruent resonance, spontaneous or retarded resonance. Both studies come to grounded hypotheses how to improve teaching. In part five, more general issues about learning process studies are discussed.

  • 203.
    Nogueira, Tiago
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Twofik, Twana
    Mälardalen University, Department of Mathematics and Physics.
    MD-80 Engine Change Kit2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    This report’s aim is to verify if it is possible, and if so, by how much SAS Component could increase the threshold values of all incoming components belonging to an MD-80 Engine Change Kit. How would this raise in the components threshold lower SAS Component’s expenses?

  • 204.
    Nyström, Olof
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Pettersson, Caroline
    Mälardalen University, Department of Mathematics and Physics.
    Utvärdering och rekommendation av uppföljningsprogram för flygplanunderhåll: för Täby Air Maintenance2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    By today’s date there are a lot of companies that are in great need of restructuring their paperwork in a more organized way. This can be excellent arranged with the help of properly constructed computer software. The aviation industry is no exception, but actually a good example of this. Täby Air Maintenance (TAM) is a company which is situated in Örebro. Their main business is aircraft maintenance on a variety of aircraft models. TAM has so far handled their work by hand or with the help of a majority of small computer programmes. The information has now become too abundant and the different kinds of software being used are no longer a working tool for the company. There is therefore a demand for an exhaustive programme which has the capacity to take care of all parts in logistics and production. The purpose is to examine and evaluate three different makes of software and form a recommendation to TAM of which one suits their needs the best. The software was Airsoft, MX System and System Airline Management (SAM). The evaluation has been performed with the help of demo versions of the programmes, manuals and support from contacts at the different manufacturers. The programmes were initially dealt with one at a time and then compared towards each other and towards the demands from TAM. The software which in the end was recommended was SAM, and the decision was based on a number of reasons. The main reason was the user friendliness of the software - the fact that its logical structure makes it easy for its user to swiftly understand the concept and thus learn how to use it quickly. This results in profits, both in time and money.

  • 205.
    Olsson, Jenny
    Mälardalen University, Department of Mathematics and Physics.
    Vilken betydelse har kontexten för matematikundervisningen i förskolan?2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [sv]

    Syftet med denna c-uppsats var att studera användningen av matematik i förskolan och undersöka vilka kontexter som påverkar pedagogerna att använda matematik i den dagliga verksamheten. I undersökningen besvarade 52 pedagoger från fyra förskolor i en mellansvensk kommun enkäter. En pedagog från förskola, en föreståndare samt en lärare i skolans tidiga år deltog i intervju. Insamlad data analyserades mot teorin att det krävs att flera del-kontexter uppfylls för att nå en meningsfull innebörd i att använda matematiken i förskolan. Det visade sig att det som påverkade dessa pedagoger mest, vad gäller att använda matematiken i vardagen, var kollegornas inställning till området i fråga samt kompetensutveckling inom detsamma. Den egna utbildningen hade däremot inte samma påverkan.

    I denna undersökning framkom det även att det saknas metoder för uppföljning av kompetensutvecklingen. Detta är ett område som behöver utvecklas så att kunskapen inte riskerar att förbli den enskilde individens kunskap, utan att det så småningom kan resultera i ett gemensamt arbetssätt inom förskolan.

  • 206.
    Papahristodoulou, Christos
    et al.
    Mälardalen University, School of Business.
    Dotzauer, Erik
    Mälardalen University, Department of Mathematics and Physics.
    Optimal portfolios using Linear Programming Models2004In: Journal of the Operational Research Society, ISSN 0160-5682, Vol. 55, no 11, p. 1169-1177Article in journal (Refereed)
    Abstract [en]

    The classical Quadratic Programming (QP) formulation of the well-known portfolio selection problem has traditionally been regarded as cumbersome and time consuming. This paper formulates two additional models, (i) maximin, and (ii) minimization of mean absolute deviation. Data from 67 securities over 48 months are used to examine to what extent all three formulations provide similar portfolios. As expected, the maximin formulation yields the highest return and risk, while the QP formulation provides the lowest risk and return, which also creates the efficient frontier. The minimization of mean absolute deviation is close to the QP formulation. When the expected returns are confronted with the true ones at the end of a six months period, the maximin portfolios seem to be the most robust of all.

  • 207.
    Petri, Jürgen
    et al.
    Institute of Physics Education, University of Bremen, Germany.
    Niedderer, Hans
    Mälardalen University, School of Education, Culture and Communication. Mälardalen University, Department of Mathematics and Physics. Institute of Physics Education, University of Bremen, Germany.
    Atomic Physics in Upper Secondary School: Layers of Conceptions in Induvidual Cognitive Structure2003In: Science Education Research in the Knowledge-Based Society, Dordrecht, The Netherlands: Kluwer Academic Publishers , 2003, p. 137-144Chapter in book (Refereed)
    Abstract [en]

    Several learning studies in the field of science education describe the final state of students’ concepts of, e.g., air pressure or chemical bonding as a multi-layered cognitive conceptual structure (manifold conceptions, multiple frameworks). The hypothesis of a multi-layered cognitive structure assumes that students - e.g., when asked to explain a specific problem - are able to activate significantly differing and competing understandings of a single concept and that therefore no essential shift of context is necessary.

    Concerning atomic physics, our hypothesis of cognitive layers is based on an explorative case study (Petri & Niedderer, 1998). In a new analysis of our interview data, we investigated the cognitive structure of six students with respect to their individual layers at the end of the course (Petri & Niedderer, 2001). Our findings, which confirm the important role of cognitive layers during conceptual change, are summarized and discussed in this paper

  • 208. Psillos, Dimitros
    et al.
    Niedderer, HansMälardalen University, School of Education, Culture and Communication. Mälardalen University, Department of Mathematics and Physics.
    Teaching and Learning in the Science Laboratory2002Collection (editor) (Refereed)
    Abstract [en]

    This book includes an edited collection of papers containing illustrations of teaching approaches and of students' learning acquisitions in the science teaching laboratory, presentation of new evaluation tools, theoretical frames and positions concerning laboratory work. The aim of the book is both to improve the design and organisation of innovative laboratory practices and to provide tools and exemplary results for the evaluation of their effectiveness, adequate for labwork in order to promote students' scientific understanding in a variety of countries. The book focuses the discussion on the role of labwork in upper secondary and in higher education.

    The papers are based on research and developmental work carried out in five European countries in the context of the European Project "Labwork in Science Education" (LSE), which was funded by the European Union, and provide a unique framework for gaining deeper insights into the role of experimentation in science teaching and learning in a variety of contexts. This substantial and significant body of research is now made available in English.

  • 209.
    Pålsson, Henrik
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Ramström, Björn
    Mälardalen University, Department of Mathematics and Physics.
    Kontaktförbindningar på räls: Undersökning av hur pinnlödning och borrning påverkar materialet i järnvägsräls2006Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [sv]

    Vid dragprovning av lödningar framkom att i många fall är kopparledningen svagare än själva lödningen och brottet sker i kopparledningen eller i kabelskon. Undersökning av mikrostrukturerna visade att det bildas martensit i grundmaterialet i ett område under pinnlödningarna. Medelvärdet på martensitlinsens storlek beräknades till 10,69 mm i diameter och 0,73 mm i djup. På grund av att grundmaterialet påverkas bör pinnlödningar sättas minst 10 mm från varandra. Lödningar gjorda i -5°C visade inga tecken på försämrad kvalitet med avseende på lägre hållfasthet eller ökad martensitbildning. Korrosion tränger in under kabelskor på pinnlödningar i områden där ingen lödfog finns. Undersökning av borrade prover visade att deformerad struktur uppkommer vid borrning samt att korrosion tränger in mellan kontaktförbindningens kopparhylsa och det borrade hålet. Vid en jämförelse mellan de båda förbindningsmetoderna framkom att lödningar är skonsammare för rälsmaterialet än borrade kontaktförbindningar men har däremot en tendens att lossna oftare. Vid val av borrade förbindningar som standard istället för pinnlödningar skulle det resultera i färre lossade anslutningar. Hållfastheten i räler skulle förmodligen påverkas och antalet sprickor från borrade hål öka.

  • 210.
    Quttineh, Nils-Hassan
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Holmström, Kenneth
    Mälardalen University, Department of Mathematics and Physics.
    Adaptive Radial Basis Algorithms (ARBF) for Expensive Black-Box Mixed-Integer Constrained Global Optimization2007Conference paper (Refereed)
  • 211.
    Rehn, Mattias
    Mälardalen University, Department of Mathematics and Physics.
    Gymnasieelevers uppfattningar om matematiska symboler2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [sv]

    För denna uppsats har syftet varit att titta närmare på elevernas uppfattningar om matematiska symboler på gymnasiet. För att ta reda på elevernas uppfattningar om matematiska symboler har jag gjort en enkätundersökning. Av de svar jag fick ger det en antydan om att eleverna kan namnge och beskriva åtminstone en del av de matematiska symboler som de är förväntade att kunna. Eleverna visar en viss antydan av att ha lättare för att skriva om en matematisk textformulering till matematiska symboler än att skriva om matematiska symboler till matematisk text. De flesta av eleverna anser att de ser en matematisk symbol som någon form av bild och nästan alla anser sig lära en ny matematisk symbol på lektionstid där flertalet frågar läraren om de inte kan. Denna studie vänder sig främst till lärare inom matematik för de senare åren men även till övriga matematiklärare som vill få en inblick i hur elever kan förhålla sig till matematiska symboler.

  • 212.
    Renström, Kristina
    Mälardalen University, Department of Mathematics and Physics.
    Laborationer i fysikundervisningen2006Independent thesis Basic level (professional degree), 10 points / 15 hpStudent thesis
    Abstract [sv]

    Arbetet gjordes för att ta reda på vad forskningen säger om laborationernas roll i fysikundervisningen. Detta gjordes genom att jag läste flera olika forskningsrapporter, bland annat från en stor undersökning inom EU där ett försök gjordes att undersöka måluppfyllelsen i dagens fysikundervisning. Forskarna tog först reda på vilka mål lärare har med sin undervisning, och sedan togs reda på i vilken utsträckning olika typer av undervisning hjälper eleverna att nå dessa mål.

    Resultaten visar att det bästa sättet att nå de fem huvudmålen (Länka teori och praktik, lära sig att utföra experiment, lära sig vetenskapliga metoder, öka motivationen och undersöka elevernas kunskaper) är en blandning av undervisningsmetoder, där laborativa moment är en viktig del. Min egen undersökning visade på samma resultat. För att få eleverna att förändra sina alternativa begrepp, så att de stämmer bättre överens med de vetenskapliga, krävs något mer än en öppen laboration.

    Variation verkar vara nyckeln till god måluppfyllelse.

  • 213.
    Ritala, Risto
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Belle, Jurgen
    Mälardalen University, Department of Mathematics and Physics.
    Holmström, Kenneth
    Mälardalen University, Department of Mathematics and Physics.
    Ihalainen, Heimo
    Mälardalen University, Department of Mathematics and Physics.
    Ruiz, Jean
    Mälardalen University, Department of Mathematics and Physics.
    Suojarvi, Mika
    Mälardalen University, Department of Mathematics and Physics.
    Tienari, Matti
    Mälardalen University, Department of Mathematics and Physics.
    Operations Decision Support based on Dynamic Simulation and Optimization2004In: Proceedings of the PulPaper 2004 Effiency Conferencen, Helsinki Finland, 2004Conference paper (Other academic)
  • 214. Ritala, Risto
    et al.
    Belle, Jurgen
    Holmström, Kenneth
    Mälardalen University, Department of Mathematics and Physics.
    Ihalainen, Heimo
    Ruiz, Jean
    Suojärvi, Mika
    Tienari, Matti
    Mälardalen University, Department of Mathematics and Physics.
    Operations decision support based on dynamic simulation and optimization2004In: Proceedings of the PulPaper 2004 Efficiency Conference, The Finnish Paper Engineers' Association, (Helsinki, Finland, June 1-4), 2004Conference paper (Refereed)
  • 215.
    Rostami, Alexander Mazyar
    Mälardalen University, Department of Mathematics and Physics. Mälardalen University, School of Education, Culture and Communication.
    Evaluating SEB Investment Strategy´s Recommended Mutual Fund Portfolios2010Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Preview:     SEB Investment Strategy is the function in SEB that supports business units SEB      Private Banking and SEB Retail with investment philosophy and investment            process. The framework of SEB Investment Strategy encompasses to manage a     structured investment philosophy and process to produce a range of investment                    options and portfolios for different target groups. From January 2006 to October        2009 forty “Proposal for fund portfolios” were produced each containing         writing on market condition and expectations plus portfolio recommendations.        Each time four portfolios consisting of six mutual funds was recommended,                    Fund Portfolio 30, 50, 70 and 100. Fund Portfolio 30 (FP30) contained           30% equity fund and 70% fixed-income funds. By same reasoning FP50           contains 50/50 equity- and fixed-income funds, FP70, 70% equity funds and         30% fixed-income funds and FP100 only equity funds.

     

    Purpose:      The aim of this work is to evaluate these SEB Investment Strategy recommended       portfolios for private SEB Retail clients from January 2006 to December 2009.    Evaluation is done by comparing the performance of recommended portfolios       with portfolios produced by applying Vasicek´s Technique and simplified   optimization technique.

     

    Method:     To allow work with Vasicek´s Technique in which we are dependent on a market        portfolio, I have created an Index which includes SEB Mutual Funds and their         share of the Index is determined from each fund´s total assets in relation to the    sum of the total assets under management of all funds inclusive in the Index.

     

    Index consists of 40 mutual funds 2002-2007 and 37 mutual funds 2008         and 2009. The total supply of funds has been reduced to the above numbers by             the following criteria:

     

    1. Clients must be able to invest in funds through conventional SEB Fund Account.
    2. No initiation fees or sales charges.
    3. Minimum historical Net Asset Value prices (NAV-prices) from 2nd January 2002.
    4. Daily trading and at least 300 million SEK in assets under management.
    5. No Fund-in-Fund products.
    6. Only SEB or SEB Choice funds.

     

    The closing daily NAV-prices (time series) of these funds have been obtained from seb.se/fonder from 2nd January 2002 to 28th December 2009. With prices daily returns are calculated and used for estimation of historical and average values of variables needed for computing forecasted Alphas and Betas according to Vasicek´s Technique. Mutual funds are then ranked with respect to excess return over forecasted Beta given risk free rate equal to Swedish government 1 month treasury-bill (SSVX1M) at time for optimisation. Top six ranked funds are included in the optimization process. The first optimized portfolio given actual T-bill is then compared to FP100 recommended by SEB Investment Strategy. In order to find optimized solutions to other recommended portfolios premiums are added to actual T-bill rate.

     

  • 216.
    Rydensjö, Ellinor
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Johansson, Marie
    Mälardalen University, Department of Mathematics and Physics.
    Utomhusmatematik: En studie om pedagogers erfarenheter med fokus på barns lärande2007Student thesis
    Abstract [sv]

    Syftet med examensarbetet är att ta reda på vad det innebär att arbeta med matematik utomhus. Vi valde att intervjua pedagoger som arbetar med utomhusmatematik om deras erfarenheter och kunskaper kring arbete med utomhusmatematik. Vi har jämfört pedagogers erfarenheter med forskning/litteratur för att komma fram till ett arbetssätt som vi kan använda oss av i vårt kommande yrkesliv. Resultatet av vår undersökning visade att det handlar om att ha ett visst förhållningssätt. Att som pedagog kunna se matematiken i vardagen och synliggöra den för barnen på ett sätt som utgår från barnens erfarenhetsvärld. Detta examensarbete visar att utomhusmatematikundervisningen lämpar sig för barn i alla åldrar och att den kan utföras under alla årstider. Vi har även kommit fram till att denna undervisning är roligare för barnen och att de lär sig genom att få vara delaktiga i undervisningen.

  • 217.
    Ryve, Andreas
    Mälardalen University, Department of Mathematics and Physics.
    Approaching Mathematical Discourse: Two analytical frameworks and their relation to problem solving interactions2006Doctoral thesis, comprehensive summary (Other scientific)
    Abstract [en]

    The driving force of conducting the two studies presented in this thesis is to examine ways that conceptual understanding and problem solving could be part of mathematics teaching, and through that, part of students' mathematical knowledge. The specific aims of the thesis are: 1) to characterize the classroom discourse of two, apparently similar, problem solving courses in teacher education and 2) to discuss the possibilities of developing two analytical approaches - the communicational approach to cognition and the dialogical approach - used for studying mathematical discourse. The two aims are elaborated on by means of data collected through audiotaped recordings and field notes from observations of problem-solving activities in engineering and teacher education. In relation to the first aim, the analysis of the classroom discourse within the two courses makes it clear that both courses displayed different kinds of discourse that could be broadly categorized in terms of: subject-oriented, didactically oriented, and problem solving oriented discourses. However, the comparisons between the two courses reveal a marked difference in the distribution of these categories of discourse. It is suggested that the introduction of explicit conceptual frameworks in teaching is of crucial importance for the topical focus of the classroom discourse, and for prospective teachers' opportunity to engage in mathematical productive discourse. The analyses of the two approaches for studying mathematical discourse reveal that the two frameworks can be further developed and the study also indicates ways in which such development can be achieved using a theory of contextualization and theories of mathematical learning. Finally, the thesis discusses theoretical and practical implications of the results, foregrounding issues of importance for the research on mathematical discourse, and for teachers and teacher educators involved in designing instructions for mathematical problem solving.

  • 218.
    Ryve, Andreas
    Mälardalen University, Department of Mathematics and Physics.
    Can collaborative concept mapping create mathematically productive discoursesManuscript (Other academic)
  • 219.
    Ryve, Andreas
    Mälardalen University, Department of Mathematics and Physics.
    Can collaborative concept mapping create mathematically productive discourses?2004In: Educational Studies in Mathematics, ISSN 0013-1954, Vol. 56, no 2-3, p. 157-177Article in journal (Refereed)
    Abstract [en]

    Four groups (three engineering students in each group) were videotaped while constructing concept maps in Linear Algebra. There are two aims of this study. The first is to characterize the discourse in the groups by addressing the following research questions: Do the students communicate in an effective way? Do the students' communications contain the elements typical for a mathematically productive discourse? The analysis indicates that the communication among the students is effective and contains the elements that are characteristic for a mathematicallyproductive interaction. The two types of methods used to analyze the data were focal and preoccupational analysis. The mathematical content and the coherence of the conversations were examined through focal analysis. The participants' engagement in the discourse was examined by preoccupational analysis, carried out by means of interactive flowchart. The second aim of this study is to evaluate the newly developed methodological framework used to characterize the discourses. The study shows that several aspects of the methodological framework need to be developed.

  • 220.
    Ryve, Andreas
    Mälardalen University, Department of Mathematics and Physics.
    Collaborative concept mapping in linear algebra2005Licentiate thesis, comprehensive summary (Other scientific)
  • 221.
    Ryve, Andreas
    Mälardalen University, Department of Mathematics and Physics.
    Making explicit the analysis of students' mathematical discourses: Revisiting a newly developed methodological framework2006In: Educational Studies in Mathematics, ISSN 0013-1954, E-ISSN 1573-0816, Vol. 62, no 2, p. 191-209Article in journal (Refereed)
    Abstract [en]

    Sfard and Kieran [Kieran, C., Educational Studies in Mathematics 46, 2001, 187-228; Sfard, A., Educational Studies in Mathematics 46, 2001, 13-57; Sfard, A. and Kieran, C., Mind, Culture, and Activity 8, 2001, 42-76] have developed a methodological framework, which aims at characterizing the students' mathematical discourses while they are working in groups. In this study, I focus on an important aspect of this methodological framework, namely the interactive flowcharts. The aim of this study is to suggest two complementary analyses for the construction of the interactive flowcharts: an additional analysis by means of the analytical construct of contextualization as well as an analysis of types ofmathematical discourses. Based on data from a study of how four groups of Swedish engineering students collaboratively construct concept maps in linear algebra. I show that the two complementary analyses make the construction of the interactive flowcharts more coherent and transparent, and hence, more reliable. Furthermore, the two complementary analyses dramatically changed the picture as to whether the studied discourseswere to be seen as mathematically productive or not. In the end of the article, I discuss the possibilities of performing the suggested additionalanalyses within the original methodological framework.

  • 222.
    Ryve, Andreas
    Mälardalen University, Department of Mathematics and Physics.
    Making explicit the construction of interactive flowcharts by means of intentional analysisManuscript (Other academic)
  • 223.
    Ryve, Andreas
    Mälardalen University, Department of Mathematics and Physics.
    Vad är kunskap i matematik [What is mathematical knowledge]?2006In: Nämnaren, Vol. 33, no 2, p. 7-9Article in journal (Other (popular science, discussion, etc.))
  • 224.
    Ryve, Andreas
    Mälardalen University, Department of Mathematics and Physics.
    What is actually discussed in problem solving courses for prospecitve teachers2007In: Journal of Mathematics Teacher Education, ISSN 1386-4416, E-ISSN 1573-1820, Vol. 10, no 1, p. 41-63Article in journal (Refereed)
    Abstract [en]

    The aim of this study is to characterize the discourse of two problem-solving courses for prospective teachers. The data, consisting of audio recordings and field notes, were examined from a dialogical approach combined with the theory of contextualization. I show not only the substantial differences between the two classroom discourses but also elaborate on plausible reasons for the divergency found. The findings then serve as a basis for a discussion of how to develop a problem-solving course within the mathematics teacher program.

  • 225.
    Rönnegård, Lars
    et al.
    Uppsala University, Sweden .
    Mishchenko, Kateryna
    Mälardalen University, Department of Mathematics and Physics. Uppsala University, Sweden .
    Holmgren, Sverker
    Uppsala University, Sweden .
    Carlborg, Örjan
    Uppsala University, Sweden .
    Increasing the Efficiency of Variance Component Quantitative Trait Loci Analysis by Using Reduced-Rank Identity-by-Descent Matrices2007In: Genetics, ISSN 0016-6731, Vol. 176, no 3, p. 1935-1938Article in journal (Refereed)
    Abstract [en]

    Recent technological development in genetics has made large-scale marker genotyping fast and practicable, facilitating studies for detection of QTL in large general pedigrees. We developed a method that speeds up restricted maximum-likelihood (REML) algorithms for QTL analysis bysimplifying the inversion of the variance-covariance matrix of the trait vector. The method was tested in an experimental chicken pedigree including 767 phenotyped individuals and 14 genotyped markers on chicken chromosome 1. The computation time in a chromosome scan covering 475 cM was reduced by 43% when the analysis was based on linkage only and by 72% when linkage disequilibrium information was included. The relative advantage of using our method increases with pedigree size, marker density, and linkage disequilibrium, indicating even greater improvements in the future. 

  • 226.
    Sanzogni, L.
    et al.
    Mälardalen University, Department of Mathematics and Physics. Griffith University, Australia.
    Chan, Ringo
    Griffith University, Australia.
    Bonner, Richard F.
    Mälardalen University, Department of Mathematics and Physics. Griffith University, Australia.
    Perceptrons with polynomial post-processing2000In: Journal of experimental and theoretical artificial intelligence (Print), ISSN 0952-813X, E-ISSN 1362-3079, Vol. 12, p. 57-68Article in journal (Refereed)
    Abstract [en]

    We introduce tensor product neural networks, composed of a layer of univariate neurons followed by a net of polynomial post-processing. We look at the general approximation properties of these networks observing in particular their relationship to the Stone-Weierstrass theorem for uniform function algebras. The implementation of the post-processing as a two-layer network, with logarithmic and exponential neurons leads to potentially important `generalized ’ product networks, which however require a complex approximation theory of Mu$ntz-Szasz-Ehrenpreis type. A back-propagation algorithm for product networks is presented and used in three computational experiments. In particular, approximation by a sigmoid product network is compared to that of a single layer radial basis network, and a multiple layer sigmoid network. An additional experiment is conducted, based on an operational system, to further demonstrate the versatility of the architecture.

  • 227.
    Sendow, Benjamin
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Hardebjer, Johan
    Mälardalen University, Department of Mathematics and Physics.
    Analys av frekvensstudien som förbättringsverktyg2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    We were assigned by Aros Industrikonsult AB to produce a presentation material for one of their

    products, the frequency study, to be used for marketing purposes. The frequency study is an

    efficiency tool which can be used to evaluate how efficient the time is being utilized in a given

    operation. In order to develop material for analysis of the frequency study we performed two

    studies. The frequency study is a data collection- and compilation tool. The study is initiated by

    coding read-off objects and activities. During the execution of the study read-off is performed at a

    given interval, e.g. once a minute. At every read-off the activity is registered at a randomly

    selected read-off object (e.g. operator or machine). This will create a statistic data base which can

    be combined in many ways to present desired information.

    This report contains the two performed frequency studies with corresponding reports, a

    compilation report were we evaluate the frequency study and the final presentation material. This

    report concludes that the frequency study is a very flexible and effective tool to evaluate current

    situation at a given operation. It can successfully be used at a wide variety of operations and does

    provide a clear picture of the strengths and weaknesses of a given operation.

  • 228.
    Silvestrov, D.
    Mälardalen University, Department of Mathematics and Physics.
    About my teacher2005In: In World of Mathematics, Vol. 11, no 1, p. 33-37Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    A memorial notes about my teacher, Professor Mikhail Yadrenko, our joint work, cooperation, and friendship.

  • 229.
    Silvestrov, D.
    Mälardalen University, Department of Mathematics and Physics.
    Quasi-stationary phenomena in nonlinearly perturbed stochstic systems2006Conference paper (Other (popular science, discussion, etc.))
    Abstract [en]

    New method of asymptotic analysis for nonlinearly perturbed stochastic processes and systems are presented. Applications to queuing systems, population dynamics systems, and risk processes are described

  • 230.
    Silvestrov, D.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Borisenko, O.
    Proceedings of the International Summer School “Insurance and Finance: Science, Practice and Education”: Foros, 20062006Conference proceedings (editor) (Refereed)
  • 231.
    Silvestrov, D.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Borisenko, O.Kiev University, Ukraine.
    Proceedings of the International Summer School “Insurance and Finance: Science, Practice and Education": Foros, 20072007Conference proceedings (editor) (Refereed)
  • 232.
    Silvestrov, D.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Drozdenko, M.
    Mälardalen University, Department of Mathematics and Physics.
    Necessary and Sufficient Conditions for Weak Convergence of First-Rare-Event Times for Semi-Markov Processes with Applications to Risk Theory2005Report (Other academic)
    Abstract [en]

    Necessary and sufficient conditions for weak convergence of first-rare-event times and stochastic flows of first-rare-events for semi-Markov processes are obtained. Also necessary and sufficient conditions for diffusion and stable approximations for ruin probabilities for riosk processes age given.

  • 233.
    Silvestrov, D.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Jonsson, H.
    Mälardalen University, Department of Mathematics and Physics.
    Stenberg, F.
    Mälardalen University, Department of Mathematics and Physics.
    Convergence of option rewards for Markov type price processes2007In: Theory of Stochastic Processes, ISSN 0321-3900, Vol. 13(29), no 4, p. 189-200Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    General condition of convergence are given for optimal rewards of American type options for perturbed Markopv type price processes controlled by market stochastic indices

  • 234.
    Silvestrov, D.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Jönsson, H.
    Mälardalen University, Department of Mathematics and Physics.
    Stanberg, F.
    Mälardalen University, Department of Mathematics and Physics.
    Convergence of Option Rewards for Markov Type Price Processes Controlled by Stochastic Indicies. 12006Report (Other academic)
    Abstract [en]

    Conditions of convergence for optimal expected rewards of American type options are given for perturbed Markov type price processes controlled by stochstic indices

  • 235.
    Silvestrov, D.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Teugels, J.
    Masol, V.
    Mälardalen University, Department of Mathematics and Physics.
    Malyarenko, A.
    Mälardalen University, Department of Mathematics and Physics.
    Reinsurance analyser2006In: International Conference Modern Stochastics: Theory and Applications, Kiev, June 19--23, 2006: abstract of communication, 2006, p. page 245-Conference paper (Other academic)
    Abstract [en]

    A program system for analysis and comparison of reincurance contracts is presented.

  • 236.
    Silvestrov, Dmitrii
    Mälardalen University, Department of Mathematics and Physics.
    Asymptotic expansions for distributions of the surplus prior and at the time of ruin2007In: Theory of Stochastic Processes, ISSN 0321-3900, Vol. 13(29), no 4, p. 183-188Article in journal (Refereed)
    Abstract [en]

    Exponential asymptotic expansion for distributions of the surplus prior and at the time of ruin are given for perturbed risk processes

  • 237.
    Silvestrov, Dmitrii
    Mälardalen University, Department of Mathematics and Physics.
    Asymptotic expansions for quasi-stationary distributions of nonlinearly perturbed semi-Markov processes2007In: Theory of Stochastic Processes, ISSN 0321-3900, Vol. 13(29), no 1-2, p. 267-271Article in journal (Refereed)
    Abstract [en]

    Asymptotic expansions for quasi-stationary distributions of nonlinearly perturbed semi-Markov processes are given

  • 238.
    Silvestrov, Dmitrii
    Mälardalen University, Department of Mathematics and Physics.
    Quasi-stationary phenomena in nonlinearly perturbed stochastc systems2007Conference paper (Other academic)
    Abstract [en]

    New methods of asymptotic analysis for nonlinearly perturbed stochstic processes and systems are presented.

  • 239.
    Silvestrov, Dmitrii
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Drozdenko, Myroslav
    Mälardalen University, Department of Mathematics and Physics.
    Necessary and sufficient conditions for weak convergence of first-rare-event times for semi-Markov processes with applications to risk theory2006Conference paper (Other (popular science, discussion, etc.))
    Abstract [en]

    necessary and sufficient condition of weak convergence for first-rara-event times for semi-Markov processes are formulated. Applications to asymptotic analysis of ruin probabilities for risk processes are discussed.

  • 240. Silvestrov, Dmitrii
    et al.
    Jönsson, Henrik
    Stenberg, Fredrik
    Mälardalen University, Department of Mathematics and Physics.
    Convergence of Option Rewards for Markov Type Price Processes Controlled by Stochastic Indices. 1.Manuscript (Other academic)
  • 241.
    Silvestrov, Dmitrii S.
    Mälardalen University, Department of Mathematics and Physics.
    Upper bounds for exponential moments of hitting times for semi-Markov processes2004In: Communications in Statistics - Theory and Methods, ISSN 0361-0926, E-ISSN 1532-415X, Vol. 33, no 3, p. 533-543Article in journal (Other academic)
    Abstract [en]

    Necessary and sufficient conditions for the existence of exponential moments for hitting times for semi-Markov processes are found. These conditions and the corresponding upper bounds for exponential moments are given in terms of test-functions. Applications to hitting times for semi-Markov random walks and queuing systems illustrate the results.

  • 242.
    Silvestrov, Dmitrii S.
    Mälardalen University, Department of Mathematics and Physics.
    Upper bounds for exponential moments of hitting times for semi-Markov processes2004In: Communications in Statistics - Theory and Methods, ISSN 0361-0926, E-ISSN 1532-415X, Vol. 33, no 3, p. 533-544Article in journal (Refereed)
    Abstract [en]

    Necessary and sufficient conditions for the existence of exponential moments for hitting times for semi-Markov processes are found. These conditions and the corresponding upper bounds for exponential moments are given in terms of test-functions. Applications to hitting times forsemi-Markov random walks and queuing systems illustrate the results.

  • 243.
    Silvestrov, Dmitrii S.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Drozdenko, M.O.
    Mälardalen University, Department of Mathematics and Physics.
    Necessary and sufficient conditions for weak convergence of first-rare-event times for semi-Markov processes. I2006In: Theory of Stochastic Processes, ISSN 0321-3900, Vol. 12(28), no 3-4, p. 151-186Article in journal (Refereed)
    Abstract [en]

    necessary and sufficient conditions for weak convergence of first-rare-event time for semi-Markov processes are given

  • 244.
    Silvestrov, Dmitrii S.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Drozdenko, M.O.
    Mälardalen University, Department of Mathematics and Physics.
    Necessary and sufficient conditions for weak convergence of first-rare-event times for semi-Markov processes. II2006In: Theory of Stochstic Processes, ISSN 0321-3900, Vol. 12(28), no 3-4, p. 187-202Article in journal (Refereed)
    Abstract [en]

    Necessary and sufficient condition for weak convergence of stochastic flows of first-rare-event times controlled by semi-Markov processes are given. Also necessary and sufficient conditions for diffusion and stable approximations of ruin probabilities for risk processes are given.

  • 245.
    Silvestrov, Dmitrii S.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Jönsson, Henrik
    Mälardalen University, Department of Mathematics and Physics.
    Kukush, Alexander G.
    Kiev University, Ukraine.
    Optimal stopping strategies for American type options2004Conference paper (Other academic)
  • 246.
    Silvestrov, Dmitrii S.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Malyarenko, Anatoliy
    Mälardalen University, Department of Mathematics and Physics.
    Silvestrova, Evelina
    Mälardalen University, Department of Mathematics and Physics.
    Stochastic modelling of insurance business with dynamical control of investments2004In: 3rd Conference in Actuarial Science & Finance in Samos, Karlovassi, September 2-5 2004, 2004, p. page 54-Conference paper (Other academic)
  • 247.
    Silvestrov, Dmitrii S.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Mishura, Yu.S.
    Mälardalen University, Department of Mathematics and Physics.
    Limit theorems for stochastic Riemann-Stieltjes integrals2004In: Theory of Stochastic Processes, ISSN 0321-3900, Vol. 10(26), p. 122-140Article in journal (Refereed)
  • 248.
    Silvestrov, Dmitrii S.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Silvestrova, Evelina
    Mälardalen University, Department of Mathematics and Physics.
    Master programmes in analytical finance at Mälardalen University2004Conference paper (Other academic)
  • 249.
    Silvestrov, Dmitrii S.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Stenberg, Fredrik
    Mälardalen University, Department of Mathematics and Physics.
    Pricing process with stochastic volatility controlled by a semi-Markov process in option pricing2004Conference paper (Other academic)
  • 250.
    Silvestrov, Dmitrii S.
    et al.
    Mälardalen University, Department of Mathematics and Physics.
    Teugels, Jozef
    Katholieke Universiteit Leuven, Belgium..
    Limit theorems for mixed max-sum processes with renewal stopping2004Conference paper (Other academic)
23456 201 - 250 of 284
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