Search results for "41"

H∞ model reduction for discrete-time Markovian jump systems with deficient mode information

2013

Published version of an article in the journal: Mathematical Problems in Engineering. Also available from the publisher at: http://dx.doi.org/10.1155/2013/537174 Open Access This paper investigates the problem of H∞ model reduction for a class of discrete-time Markovian jump linear systems (MJLSs) with deficient mode information, which simultaneously involves the exactly known, partially unknown, and uncertain transition probabilities. By fully utilizing the properties of the transition probability matrices, together with the convexification of uncertain domains, a new H∞ performance analysis criterion for the underlying MJLSs is first derived, and then two approaches, namely, the convex li…

En matematikklærers bruk av medierende redskaper i undervisning av lengde, areal og volum

2013

Masteroppgave i matematikkdidaktikk- Universitetet i Agder 2013 Denne studien har tittelen «En matematikklærers bruk av medierende redskaper i undervisning av lengde, areal og volum». Målet med denne studien er å studere hvordan en ungdomsskolelærer formidler matematikk til elever gjennom sin bruk av medierende redskaper og gjennom sin organisering av undervisningen. Målet er derfor også implisitt å si noe om hvordan dette legger til rette for at elevene kan ta mening av det matematiske innholdet som blir presentert i klasserommet. Studien baserer seg på kvalitativ forskning der jeg har fulgt en ungdomsskoleklasse på åttende trinn og deres lærer gjennom fire skoletimer hvor de arbeider med …

Matematikk i krisetid : matematikk og matematikere etter første verdenskrig, i mellomkrigstiden og under andre verdenskrig i Nederland

2013

Masteroppgave i matematikkdidaktikk- Universitetet i Agder 2013 We have provided new and partly unknown historical material on an important period of social, political and scientific development and change both in the Netherlands and internationally. We focused on the so far neglected history of mathematics in the Netherlands between the Two World Wars, including the period of political “cleansing” after the War. We have collected and commented biographical material on all leading Dutch mathematicians of the period as far we could reach it. We investigated in particular the political behavior of teaching personnel and of students and found differences both individually and between various i…

A model to analyse algebraic tasks solved by students : a comparative study from Finland and Norway

2013

Masteroppgave i matematikkdidaktikk- Universitetet i Agder Participating in the international VIDEOMAT-project, which is accomplished by four universities from Finland, Norway, Sweden and California (USA), this master thesis has beenbased on a comparative study about the introduction of algebrain Finland and Norway. The focus of the present study has beento compare the way studentssolve algebraic tasks: theprocedures which they use while solving tasks and the mistakes they produce. Similarities and/or differences have beenidentified between those two countries. The empirical material for thisresearch has already been collected and it includes videotaped lessons, lesson graphsand students’ w…

Improving students’ mathematics self-efficacy: A systematic review of intervention studies

2022

Self-efficacy is an integral part of personal factors that contributes substantially to students' success in mathematics. This review draws on previous intervention studies to identify, describe, and expose underlying mechanisms of interventions that foster mathematics self-efficacy. The findings show that effective mathematics self-efficacy interventions can be categorized into three categories using their underlying mechanisms: those that directly manipulate sources of self-efficacy to foster the construct, and those that either embed self-efficacy features in teaching methods or in learning strategies. Specific examples of interventions that fall in each of these three categories are des…

Water Chemistry in the Confluence Zone Downstream a Limestone Treated Lake and an Acid Tributary: Principal Component Analyses Including Warm and Col…

2010

Published version of an article from the journal:International Journal of Arts and Sciences. Also available from the publisher: http://www.openaccesslibrary.org/images/XEW244_Alfred_A._Christy_II_.pdf. Open Access Extensive limestone treatment of lakes and watercourses has been carried out especially in Norway and Sweden to counteract effects of acidification. Lakes have been the most commonly treated part of the water systems. However, treatment of lakes upstream acid tributaries may introduce downstream toxic mixing zones for fish. To sort this out the outlet of a treated lake, a downstream acid tributary and two sites in the confluence zone were intensely monitored during a period of 28 …

Imposing tree-based topologies onto self organizing maps

2011

Accepted version of an article from the journal Information Sciences. Definitive published version available on Elsevier Science Direct: http://dx.doi.org/10.1016/j.ins.2011.04.038 The beauty of the Kohonen map is that it has the property of organizing the codebook vectors, which represent the data points, both with respect to the underlying distribution and topologically. This topology is traditionally linear, even though the underlying lattice could be a grid, and this has been used in a variety of applications [23,35,40]. The most prominent efforts to render the topology to be structured involves the Evolving Tree (ET) due to Pakkanen et al. [36], and the Self-Organizing Tree Maps (SOTM)…

Matematiske læringsmuligheter for alle En styrkebasert flerkasusstudie om elever som presterer lavt i matematikk sin deltakelse i heterogene smågrupp…

2022

Bruk av elevbøker i matematikk på ungdomssteget : ein kasusstudie

2013

Doktorgradsavhandling ved Universitetet i Agder, Fakultet for teknologi og realfag, Kristiansand The focus of this dissertation is on ways students and teachers work with the student-book in mathematics in lower secondary school. The intention is to study how it is integrated to the learning activity in the subject. The student-book in mathematics was introduced at the end of the 90s. It was depict as a pedagogical tool, mainly in the learning process for the individual student (Eksamenssekretariatet, 2000), by giving the students the opportunity to take responsibility for their own learning. This study is part of a larger research project on classrooms, Kvalitet i opplæringa (KIO) (Quality…

Learning and teaching functions and the transition from lower secondary to upper secondary school

2013

Doktorgradsavhandling ved Universitetet i Agder, Fakultet for teknologi og realfag, Kristiansand