Search results for "IIP"
showing 10 items of 177 documents
Kiipeilyn vaikutukset Keski-Suomen jyrkänteiden kasvillisuuteen
2006
Kalmbergin kartasto R VI : List 2
1855
Kalmbergin kartasto R V : List 3
1855
Jäkkäniska : Julius Anselm Lyly (1856-1903) viipurilaisena lehtimiehenä ja paikallispoliitikkona
2019
Spatiaalisen ikkunoinnin ja sokean signaalinerottelun menetelmien hyödyntäminen MEG-aineiston analysoinnissa
2018
Sokean signaalinerottelun menetelmät ovat käyttökelpoisia magnetoenkefalografilla mitattujen aivomagneettikäyrien analysoinnissa. Sokean signaalinerottelun menetelmien avulla voidaan selvittää, mistä aivoaktivaatio on peräisin ja millaisiin toimintoihin aktivaatio voidaan yhdistää. MEG-aineiston ajallinen tarkkuus on hyvä, joten lyhytkin mittausaika tuottaa hyvin suuren aineiston. Suuren aineiston tuottamat laskennalliset ongelmat voidaan kiertää ikkunoimalla MEG-aineisto aika- tai tilasuunnassa. Aineiston ikkunointia on sovellettu aiemmissa tutkimuksissa toiminnallisen magneettikuvauksen aineistoon, jolloin ikkunointi on tehty aikasuunnassa. Tässä tutkielmassa ikkunointia sovellettiin MEG-…
Bubbles in China
2010
This study examines rational bubbles in Chinese stock markets and China-related share indices in Hong Kong. A duration dependence test is employed for both monthly and weekly abnormal market returns of the Shanghai and Shenzhen A- and B-markets, as well as for the Hong Kong China Enterprises and China Affiliated Corporations indices. The test results are mixed, as weekly data demonstrate bubbles for all of the Mainland Chinese stock markets, but monthly data do not show bubbles for any of the examined markets. Neither of the datasets indicates bubbles in the Hong Kong markets. Results indicate that, in terms of bubbles, segmentation does not play a significant role in bubble existence and t…
Escapism and Excessive Online Behaviors: A Three-Wave Longitudinal Study in Finland during the COVID-19 Pandemic.
2022
Excessive online behaviors refer to harmful or disproportionate use of digital network applications. Such behaviors are likely to be associated with escapist motives. Our aim was to analyze whether escapism predicts excessive gambling, excessive gaming, and excessive internet use over time. A longitudinal sample of Finnish residents aged 18–75 years (n = 1022, 51.27% male) was surveyed at three time points during the COVID-19 pandemic in 6-month intervals: April 2021 (Time 1), October–November 2021 (Time 2), and April–May 2022 (Time 3). Of the original Time 1 respondents, 66.80% took part in the surveys at both Time 2 and Time 3. All surveys included measures for excessive gambling (Problem…
Psychometric properties of the Internet Gaming Disorder Test (IGDT-10) and problematic gaming behavior among Finnish vocational school students.
2019
This study was conducted to investigate the psychometric properties of the Finnish version of the Internet Gaming Disorder Test (IGDT-10), identify the proportion displaying problematic gaming behavior (PGB) among Finnish vocational school students, and characterize the relationships between sociodemographic factors and gaming characteristics predicting PGB in this population. This cross-sectional study involving 773 students (mean age 17.5 years). Socio-demographic and gaming behavior characteristics were established using a web-based survey. A confirmatory factor analysis (CFA) showed that the IGDT-10 test has appropriate psychometric properties. The proportion of students exhibiting PGB …
The squared symmetric FastICA estimator
2017
In this paper we study the theoretical properties of the deflation-based FastICA method, the original symmetric FastICA method, and a modified symmetric FastICA method, here called the squared symmetric FastICA. This modification is obtained by replacing the absolute values in the FastICA objective function by their squares. In the deflation-based case this replacement has no effect on the estimate since the maximization problem stays the same. However, in the symmetric case we obtain a different estimate which has been mentioned in the literature, but its theoretical properties have not been studied at all. In the paper we review the classic deflation-based and symmetric FastICA approaches…