Search results for "correlation"

Extremely low frequency magnetic fields in residences in Germany. Distribution of measurements, comparison of two methods for assessing exposure, and…

2001

We examined the results of 1,835 magnetic field measurements in German residences conducted between November 1997 and September 1999. The measurements were part of an epidemiological study on the relationship between magnetic fields and childhood leukemia. We performed a fixed-location measurement of the magnetic field at 50 Hz and 16 2/3 Hz (frequency of the German railway system) over 24 h in the child's bedroom in the residence of each study participant. In addition, we conducted a second 24 h-measurement in the living room at 50 Hz, and spot measurements while walking through all rooms of the respective dwelling. Median 50 Hz magnetic fields above 0.2 muT were found to be infrequent in …

MEDIATING ROLE OF DISSOCIATION SYMPTOMS BETWEEN ADOLESCENT COMPULSIVE INTERNET USE ACROSS TIME

2020

The aim of this study was to examine adolescent compulsive internet use (CIU) across a one-year period, to examine associations with symptoms of depression, anxiety and dissociation, as well as to analyze the potential mediating effect of dissociation symptoms.  Previous studies have indicated that dissociation might serve as a coping strategy and/or as a consequence of problematic internet use. Participating in the study were 80 adolescents (39 girls and 41 boys), ages from 12 to 18 (mean age 14.90 years) at the time of the first measurement.  At Time 1 and one year later at Time 2 measurement points the participants completed the Trauma Symptom Checklist (Briere, 1995) and items from the …

Aerobic fitness mediates the intervention effects of a school-based physical activity intervention on academic performance. The school in Motion stud…

2021

Highlights • Physical activity is associated with increased aerobic fitness and academic performance. • Little is known on mechanism of physical activity effects on academic performance. • We performed a cluster randomized controlled trial. • Aerobic fitness mediated the intervention effect on academic performance. • Activity increasing aerobic fitness is a strategy to improve academic performance.

Acceptance and validity of the methods used to implement a competency based medical education programme in an Intensive Care Department of a teaching…

2021

Abstract Objectives 1. To determine the satisfaction of tutors and residents with a specific methodology used to implement CoBaTrICE. 2. To determine the reliability and validity of the global rating scales designed ad hoc to assess the performance of the residents for training purposes. Design Prospective cohort study. Participants All the residents and tutors of the ICU Department of the Hospital Universitario y Politecnico la Fe de Valencia. Intervention CoBaTrICE implementation started in March 2016, it was based on: (1) Training the tutors in feedback techniques; (2) Performing multiple objective and structured work based assessments to achieve the competences of the program; and (3) T…

CLASS ATTENDANCE AS A FACTOR AFFECTING ACADEMIC PERFORMANCE

2020

The purpose of this paper is to investigate whether class attendance in higher education improves academic performance. The research has been performed among bachelor level (EQF 6) international students studying in English for a full-time degree in Latvia.  The attendance is analysed for fall and spring semesters while the academic performance has been analysed in three categories – midterm exam grade, exam grade and the final assessment. Correlation as a research instrument has been applied. The research results reveal interconnectivity between the attendance of classes and the subsequent academic performance.The results of the correlation obtained have been discussed with a representativ…

Physical exercise adherence in Finnish children using a music mat: a pilot study

2020

A growing number of studies has shown that informal musical activities, such as singing, playing an instrument, and musical play at home, are positively associated with children’s health. This paper examines the associations between fourteen 4–6-year-old children’s and their parents’ exercise activity, children’s musical and their exercise adherence when using a music mat over an eight-week period in the home environment. Our results show that most of the children moved on the mat breezily and briskly. The parents assessed that exercises required balance and movement control more than endurance or strength. Spearman’s rank-order correlation showed a strong, positive correlation between the …

2016

Abstract. Characterization of daytime sources of nitrous acid (HONO) is crucial to understand atmospheric oxidation and radical cycling in the planetary boundary layer. HONO and numerous other atmospheric trace constituents were measured on the Mediterranean island of Cyprus during the CYPHEX (CYprus PHotochemical EXperiment) campaign in summer 2014. Average volume mixing ratios of HONO were 35 pptv (±25 pptv) with a HONO ∕ NOx ratio of 0.33, which was considerably higher than reported for most other rural and urban regions. Diel profiles of HONO showed peak values in the late morning (60 ± 28 pptv around 09:00 local time) and persistently high mixing ratios during daytime (45 ± 18 pptv), i…

Cross-correlation and cross-power spectral density representation by complex spectral moments

2017

Abstract A new approach to provide a complete characterization of normal multivariate stochastic vector processes is presented in this paper. Such proposed method is based on the evaluation of the complex spectral moments of the processes. These quantities are strictly related to the Mellin transform and they are the generalization of the integer-order spectral moments introduced by Vanmarcke. The knowledge of the complex spectral moments permits to obtain the power spectral densities and their cross counterpart by a complex series expansions. Moreover, with just the aid of some mathematical properties the complex fractional moments permit to obtain also the correlation and cross-correlatio…

Autocorrelation in meter induction: the role of accent structure.

2006

The performance of autocorrelation-based meter induction was tested with two large collections of folk melodies, consisting of approximately 13 000 melodies for which the correct meters were available. The performance was measured by the proportion of melodies whose meter was correctly classified by a discriminant function. Furthermore, it was examined whether including different melodic accent types would improve the classification performance. By determining the components of the autocorrelation functions that were significant in the classification it was found that periodicity in note onset locations was the most important cue for the determination of meter. Of the melodic accents includ…

A fuzzy approach to the evaluation of image complexity

2009

The inherently multidimensional problem of evaluating the complexity of an image is of a certain relevance in both computer science and cognitive psychology. Computer scientists usually analyze spatial dimensions in order to deal with automatic vision problems, such as feature extraction. Psychologists seem more interested in the temporal dimension of complexity, as a means to explore attentional models. Is it possible to define, by merging both approaches, a more general index of visual complexity? The aim of this paper is the definition of objective measures of image complexity that fits with the so named perceived time. Towards the end we have defined a fuzzy mathematical model of visual…