Search results for " analyysi"
showing 10 items of 155 documents
On a Continuous Sárközy-Type Problem
2022
Abstract We prove that there exists a constant $\epsilon> 0$ with the following property: if $K \subset {\mathbb {R}}^2$ is a compact set that contains no pair of the form $\{x, x + (z, z^{2})\}$ for $z \neq 0$, then $\dim _{\textrm {H}} K \leq 2 - \epsilon $.
Toimijuuden ja identiteetin yksilölliset ja sosiaaliset painotukset korkeakoulutettujen urapoluilla
2021
Tarkastelemme tutkimuksessa toimijuutta ja identiteettiä korkeakoulutettujen uratarinoissa. korkeakoulutettujen urapolkuja tutkimalla tunnistamme sekä korkeakoulutettujen urien rakentumisen tapoja että yksilön ja yhteiskunnan asettamien odotusten ja tavoitteiden merkitystä urapoluilla. Aineisto koostui Töissä.fi-verkkopalvelun kautta kerätyistä korkeakoulutettujen uratarinoista (N = 462). Tutkimusaineiston narratiivisessa analyysissa tarkastelimme, millaisia urapolkuja uratarinoista oli tunnistettavissa sekä millaisia toimijuuden ja identiteetin yksilöllisiä ja sosiaalisia painotuksia uratarinat sisälsivät. Analyysin pohjalta loimme seitsemän uratyyppitarinaa, jotka nimesimme urapolun raken…
Rotational coherence imaging and control for CN molecules through time-frequency resolved coherent anti-Stokes Raman scattering
2011
Numerical wave packet simulations are performed for studying coherent anti-Stokes Raman scattering (CARS) for CN radicals. Electronic coherence is created by femtosecond laser pulses between the X²Σ and B²Σ states. Due to the large energy separation of vibrational states, the wave packets are superpositions of rotational states only. This allows for a specially detailed inspection of the second- and third-order coherences by a two-dimensional imaging approach. We present the time-frequency domain images to illustrate the intra- and intermolecular interferences, and discuss the procedure to rationally control and experimentally detect the interferograms in solid Xe environment. peerReviewed
Higher-order Hamilton–Jacobi perturbation theory for anisotropic heterogeneous media: dynamic ray tracing in Cartesian coordinates
2018
With a Hamilton–Jacobi equation in Cartesian coordinates as a starting point, it is common to use a system of ordinary differential equations describing the continuation of first-order derivatives of phase-space perturbations along a reference ray. Such derivatives can be exploited for calculating geometrical spreading on the reference ray and for establishing a framework for second-order extrapolation of traveltime to points outside the reference ray. The continuation of first-order derivatives of phase-space perturbations has historically been referred to as dynamic ray tracing. The reason for this is its importance in the process of calculating amplitudes along the reference ray. We exte…
Analysis of errors caused by incomplete knowledge of material data in mathematical models of elastic media
2011
Students at the core of English-medium instruction : research on the study paths of international master's degree students and the role of academic E…
2018
The present study focuses on the International Master’s Degree Programs (IMDP) of the University of Jyväskylä and issues related to English-medium instruction (EMI). At the core of the present study are the IMDP students’ conceptualizations of, and reflections on, academic English. Furthermore, the study examines the IMDP students’ reported language gains in academic English as well as the internal and external factors to which the students’ attribute these gains, or the lack of them. In order to map out these aspects, 15 IMDP students were interviewed at the end of their two-year program. These interviews were then analyzed inductively with the help of Atlas.ti software and by adhering to …
A Kinematic Analysis of Three Best 100 m Performances Ever
2013
The purpose of this investigation was to compare and determine the relevance of the morphological characteristics and variability of running speed parameters (stride length and stride frequency) between Usain Bolt’s three best 100 m performances. Based on this, an attempt was made to define which factors determine the performance of Usain Bolt's sprint and, therefore, distinguish him from other sprinters. We analyzed the previous world record of 9.69 s set in the 2008 Beijing Olympics, the current record of 9.58 s set in the 2009 Berlin World Championships in Athletics and the O lympic record of 9.63 s set in 2012 London Olympics Games by Usain Bolt. The application of VirtualDub Programme …
Optimal recovery of a radiating source with multiple frequencies along one line
2020
We study an inverse problem where an unknown radiating source is observed with collimated detectors along a single line and the medium has a known attenuation. The research is motivated by applications in SPECT and beam hardening. If measurements are carried out with frequencies ranging in an open set, we show that the source density is uniquely determined by these measurements up to averaging over levelsets of the integrated attenuation. This leads to a generalized Laplace transform. We also discuss some numerical approaches and demonstrate the results with several examples.
Examining stability of independent component analysis based on coefficient and component matrices for voxel-based morphometry of structural magnetic …
2018
Independent component analysis (ICA) on group-level voxel-based morphometry (VBM) produces the coefficient matrix and the component matrix. The former contains variability among multiple subjects for further statistical analysis, and the latter reveals spatial maps common for all subjects. ICA algorithms converge to local optimization points in practice and the mostly applied stability investigation approach examines the stability of the extracted components. We found that the practically stable components do not guarantee to produce the practically stable coefficients of ICA decomposition for the further statistical analysis. Consequently, we proposed a novel approach including two steps: …
Korpusavusteinen virheanalyysi tarkkuuden kehityksestä EVK:n taitotasoilla A2–B2
2020
Artikkelissa tarkastellaan kielitaidon taitotasoittaista kehittymistä potentiaalisten esiintymien analyysin (Potential Occasion Analysis, Thewissen, 2015) avulla. Kehittymistä analysoidaan tarkkuuden näkökulmasta, ja sitä mitataan kohdekielen muoto- ja käyttökonventioista poikkeavien muotojen määrällä. Tutkimus on korpuspohjaista virheanalyysia (Corpus-aided Error Analysis, Dagneaux, Dennes & Granger, 1998), ja se perustuu taitotasoilla havaittujen, yhdeksään virheluokkaan sijoittuvien virheiden määrien tilastolliseen testaukseen. Aineistona on Kansainvälinen oppijansuomen korpus(ICLFI). Analyysi osoittaa, että merkittävintä kehitys on tasojen B1 ja B2 välillä; tasojen A2 ja B1 välillä tark…