Search results for "simulointi"

Understanding altered contractile properties in advanced age : insights from a systematic muscle modelling approach

2023

Age-related alterations of skeletal muscle are numerous and present inconsistently, and the effect of their interaction on contractile performance can be nonintuitive. Hill-type muscle models predict muscle force according to well-characterised contractile phenomena. Coupled with simple, yet reasonably realistic activation dynamics, such models consist of parameters that are meaningfully linked to fundamental aspects of muscle excitation and contraction. We aimed to illustrate the utility of a muscle model for elucidating relevant mechanisms and predicting changes in output by simulating the individual and combined effects on isometric force of several known ageing-related adaptations. Simu…

Luurankolihassolun glykolyysin simulointi differentiaaliyhtälöillä

2015

Solun aineenvaihduntaa on hankala tutkia. Simulointi voi olla eräs ratkaisu ongelmaan. Tutkielma tarkastelee differentiaaliyhtälöihin perustuvaa luurankolihaksen glykolyysin simuloimista. Siihen on kehitetty 2000-luvulla glykolyysin reaktioiden empiirisiin mittaustuloksiin perustuvia malleja. Differentiaaliyhtälömallit soveltuvat hyvin simuloimiseen, ja suurinpana ongelmana voidaan pitää parametrien saatavuutta ja epävarmuutta. Cell metabolism is difficult to investigate. Simulation can be one solution to the problem. This thesis examines differential equation based simulation of skeletal muscle glycolysis. For simulation, in 2000s it has been developed models based on empirical measurement…

Discrete element model for viscoelastic materials with brittle fracture : applications on glacier dynamics

2017

New Challenges for the Greening of Transport : CM3 - Computational Multi Physics, Multi Scales and Multi Big Data in Transport Modeling, Simulation a…

2015

Increasing the drying efficiency of cylinder drying

2011

This PhD Thesis concentrates on paper drying: first on the drying rate in a cylinder covered with fabric, enhanced using hot air impingement through the fabric, and its potential effects on paper quality, and second, on the heat transfer rate from hot steam to paper through the cylinder shell. Cylinder drying is a drying method where a heated surface in contact with paper causes water removal from the latter by evaporation. Impingement through the fabric of hot air has been suggested to cause increase in the water removal and drying of paper. Increase in the drying rate by impingement of hot air was confirmed by laboratory tests and by simulations. In laboratory tests the increase in the dr…

Shape sensitivity analysis for numerical solution of free boundary problems

2005

Kari Kärkkäinen tutki tehokkaita ja käyttökelpoisia ratkaisumenetelmiä vapaita pintoja sisältäville malleille. Hän tarkastelee väitöksessään numeerisessa simuloinnissa käytettävien vapaan pinnan ratkaisumenetelmien tehokkuutta ja niiden parantamista käyttäen matemaattista lähestymistapaa. Kärkkäinen ehdottaa ratkaisumenetelmää, jonka avulla vapaan pinnan tehtävien ratkaiseminen on helpompaa. Menetelmää voi myös soveltaa erilaisiin tilanteisiin. This work is devoted to the development of efficient and robust solution algorithms for a class of free boundary problems. This consists of mathematical analysis of different model problems and the description of numerical implementation to generic f…

Solving classification problems with multicriteria decision aiding approaches

2007

Iryna Yevseyevan väitöskirjan aiheena on päätöksentekijän avustaminen hänen ratkaistessaan vaativia ja monimutkaisia luokittelutehtäviä. Tällaisia tehtäviä esiintyy erityyppisessä diagnostiikassa, esimerkiksi lääketieteen alalla lääkärin diagnosoidessa potilasta, tekniikan alalla insinöörin määrittäessä koneen rikkoutumisen syytä tai talouden alalla sijoittajan arvioidessa riskejä ennen sijoituspäätöstä.Yevseyevan tutkimat ja kehittämät menetelmät ovat avuksi silloin, kun luokittelupäätökset ovat riippuvaisia päätöksentekijän subjektiivisesta tietämyksestä, intuitiosta ja mieltymyksistä. Esitetyt menetelmät mahdollistavat ongelmakentän määrittelyn ja formalisoinnin, ja lisäksi ne tarjoavat …

Trade-offs among intensive forestry, ecosystem services and biodiversity in boreal forests

2018

Finnish forests are used extensively for timber production but are also providers of other ecosystem services and harbor unique biodiversity. The ecosystem services approach has so far been used marginally in the context of Finnish forestry; however, due to the multiple values associated with Finnish forests and the impacts forestry operations have on forest ecosystems, it is clearly applicable in this context. In this thesis, I studied the occurrence and severity of trade-offs among ecosystem services and biodiversity conservation in Finnish forests. I used forest inventory data, forest growth simulations, and multi-objective optimization to reveal how the severity of the trade-offs varies…

Enhancing the performance of HSDPA communication with multipoint transmission techniques

2015

The evolution of mobile phones, tablets and other mobile communication devices has led to a significant increase in the amount of data delivered over mobile networks. In order to satisfy the climbing data rate demands of customers, existing mobile broadband networks are being expanded with new features that allow ubiquitous and consistent networking experience. This research presents three multipoint transmission techniques for Wideband Code Division Multiple Access (WCDMA) based High-Speed Downlink Packet Access (HSDPA) communication protocol. Multiflow, High-Speed Single-Frequency Network (HS-SFN) and Multipoint-to-Point Single-Frequency Network (M2P-SFN) enable transmission of user-dedicat…

The focus and timing of gaze matters : Investigating collaborative knowledge construction in a simulation-based environment by combined video and eye…

2022

Although eye tracking has been successfully used in science education research, exploiting its potential in collaborative knowledge construction has remained sporadic. This article presents a novel approach for studying collaborative knowledge construction in a simulation-based environment by combining both the spatial and temporal dimensions of eye-tracking data with video data. For this purpose, we have investigated two undergraduate physics student pairs solving an electrostatics problem in a simulation-based environment via Zoom. The analysis of the video data of the students’ conversations focused on the different collaborative knowledge construction levels (new idea, explication, eval…