Search results for "AAL"

Norm-inflation results for purely BBM-type Boussinesq systems

2022

This article is concerned with the norm-inflation phenomena associated with a periodic initial-value abcd-Benjamin-Bona-Mahony type Boussinesq system. We show that the initial-value problem is ill-posed in the periodic Sobolev spaces H−sp (0, 2π)×H−sp (0, 2π) for all s > 0. Our proof is constructive, in the sense that we provide smooth initial data that generates solutions arbitrarily large in H−sp (0, 2π) × H−sp (0, 2π)-norm for arbitrarily short time. This result is sharp since in [15] the well-posedness is proved to holding for all positive periodic Sobolev indexes of the form Hsp (0, 2π) × Hsp (0, 2π), including s = 0. peerReviewed

An efficient functional magnetic resonance imaging data reduction strategy using neighborhood preserving embedding algorithm

2021

High dimensionality data have become common in neuroimaging fields, especially group-level functional magnetic resonance imaging (fMRI) datasets. fMRI connectivity analysis is a widely used, powerful technique for studying functional brain networks to probe underlying mechanisms of brain function and neuropsychological disorders. However, data-driven technique like independent components analysis (ICA), can yield unstable and inconsistent results, confounding the true effects of interest and hindering the understanding of brain functionality and connectivity. A key contributing factor to this instability is the information loss that occurs during fMRI data reduction. Data reduction of high …

Discovering hidden brain network responses to naturalistic stimuli via tensor component analysis of multi-subject fMRI data

2021

The study of brain network interactions during naturalistic stimuli facilitates a deeper understanding of human brain function. To estimate large-scale brain networks evoked with naturalistic stimuli, a tensor component analysis (TCA) based framework was used to characterize shared spatio-temporal patterns across subjects in a purely data-driven manner. In this framework, a third-order tensor is constructed from the timeseries extracted from all brain regions from a given parcellation, for all participants, with modes of the tensor corresponding to spatial distribution, time series and participants. TCA then reveals spatially and temporally shared components, i.e., evoked networks with the …

"I just saw someone die omfg" : multimodal representations of the shooting of Michael Brown on Tumblr

2015

Tämän tutkielman aiheena on tutkia suosiotaan kasvattavan sosiaalisen median sivuston Tumblrin rakentamia representaatioita postauksissa, jotka jatkuvasti käsittelivät tavalla tai toisella Yhdysvalloissa, Fergusonin kaupungissa elokuussa 2014 tapahtunutta poliisin ja tummaihoisen nuoren miehen, Michael Brownin, välistä yhteenottoa jossa Brown sai surmansa. Ampumatapaus ja sitä seuranneet mielenosoitukset saivat huomiota sekä perinteisessä että sosiaalisessa mediassa. Tutkielmani tarkoitus on selvittää kuinka kyseiseen ampumatapaukseen liittyvissä postauksissa Tumblrissa tapausta representoitiin, eli millaisia merkityksiä siitä rakennettiin multimodaalisin eli monikanavaisin keinoin. Aineist…

On fractional smoothness and approximations of stochastic integrals

2009

Persoona ja yhteisö : personalistinen sosiaalipedagogiikka

2002

Remembered, Read and Experienced Time in Virtual Text (= Tempo lembrado, lido e experienciado no texto virtual)

2015

In this article I will scrutinize Screen (2002, by WARDRIP-FRUIN & al.), a literary work set and experienced in a CAVE Virtual Reality environment, especially from the perspective of its temporal aspects. There are obvious themes of remembering, forgetting and textually constructing the past in this work, but most notably, Screen emphasizes the temporality of the reading act itself. I will analyze this highly special work in relation to the remembered, read, and bodily experienced time, and thus, attempt to better understand both the notion of fictive time and the temporality of fiction. peerReviewed

Crisis management in social media : maintaining the organizational image

2017

The field of crisis communication has faced major changes since the expansion of internet and social media platforms. The difficulty of using social media platforms to or-ganizations’ own advantage in crisis situations has become a recent topic of discussion amongst professionals. The image of an organization provides them competitive advantage in multiple fields, so it is vital to manage these situations so the image remains positive with stakeholders. This thesis aims to provide insights for organizations on how to utilize social media in their crisis communication. 11 Finnish companies with crisis situations during the year 2016 were identified and the data was retrieved from social medi…

Adolescents' school-related self-concept mediates motor skills and psychosocial well-being.

2014

Background The health benefits of exercise participation and physical activity for mental health and psychosocial well-being (PSWB) have been shown in several studies. However, one important background factor, that is, motor skills (MSs), has largely been ignored. In addition, most of the existing research focuses on poor MSs, that is, poor MSs are often connected to poorer PSWB. The mechanism linking MSs and PSWB is unclear. However, a preliminary suggestion has been made that self-worth or self-perceptions might mediate the association between MSs and PSWB. Aim We investigated whether the self-concepts (SCs) of school-related physical education (SCPE), reading (SCR), and mathematics (SCM)…

Female style vs. male style or something in between? : a case study on gendered communication on the Humans of New York Facebook page

2015

Sosiaalinen media on viime vuosikymmenen aikana mullistanut internetin avulla tapahtuvaa viestintää ja sen tuomia uusia mullistuksia onkin tutkittu tieteellisesti paljon viime aikoina. Sukupuolen ja kielen roolia sosiaalisen median myllerryksessä ei viestinnällisestä näkökulmasta kuitenkaan ole tutkittu kovin paljon ja siksi tämän tutkimuksen tarkoituksena oli kartoittaa, millaista naisten ja miesten kielenkäyttö on nykyään internetissä ja miten se peilautuu aiempien tutkimustulosten valossa. Tutkimuksen aineisto koostui 170 tavallisten ihmisten kirjoittamista kommenteista, jotka valittiin suositulta Humans of New York Facebook-sivulta tammikuun 2015 aikana. Nämä kommentit jaettiin laadulli…