Search results for "Tracking"

Tracking of physical activity from early childhood through youth into adulthood.

2014

The aim of the study was to investigate the tracking of physical activity (PA) from preschool age to adulthood in six age cohorts of males and females.A random sample of 3596 boys and girls age 3-18 yr participated in the Cardiovascular Risks in Young Finns Study in 1980. The follow-up measurements were repeated in 1986, 1992, 2001, and 2007. The PA was measured by mother's report in 3- and 6-yr-olds and self-report in 9-yr-olds and older. Tracking of PA was analyzed using the Spearman rank-order correlation and a simplex model.Mother-reported PA at age 3 and 6 yr significantly predicted self-reported PA in youth and in young adulthood, and there was a significant indirect effect of mother …

The extreme longevity: the state of the art in Italy

2008

Implementing a Digital Wellness Application into Use : Challenges and Solutions Among Aged People

2020

The ageing population is a growing priority area for policy makers and healthcare providers worldwide. Life expectancy is improving, but at the same time, insufficient physical activity threatens older age. Thus, an important question arises: how to improve the probability of people living a healthy and active life in older age. One potential solution to support physical activity and healthy aging is digital wellness technologies. However, digital wellness technologies are still typically designed for younger populations, yet a growing need and potential also among aged people is prevalent. Aged people are a user group with distinct needs and challenges. The main purpose of this study was t…

“Positive biology”: the centenarian lesson

2012

Abstract The extraordinary increase of the elderly in developed countries underscore the importance of studies on ageing and longevity and the need for the prompt spread of knowledge about ageing in order to satisfactorily decrease the medical, economic and social problems associated to advancing years, because of the increased number of individuals not autonomous and affected by invalidating pathologies. Centenarians are equipped to reach the extreme limits of human life span and, most importantly, to show relatively good health, being able to perform their routine daily life and to escape fatal age-related diseases. Thus, they are the best example of extreme longevity, representing select…

Tracking the ice: Subterranean harvestmen distribution matches ancient glacier margins

2019

Biogeographic studies often underline the role of glacial dynamism during Pleistocene (1.806-0.011 Mya) in shaping the distribution of subterranean species. Accordingly, it is presumed that present-day distribution of most specialized cold-adapted (cryophilic) cave-dwelling species should bear the signatures of past climatic events. To test this idea, we modelled the distribution of specialized cold-adapted subterranean alpine harvestmen (Arachnida: Opiliones: Ischyropsalididae: Ischyropsalis). We found that the distance from the glacier margins during Last Glacial Maximum (LGM; about 22,000 years ago) was the most important predictor of their present-day distribution. In particular, the pe…

Bring the state (information) in: Campaign dynamics in the run-up to a German referendum

2015

This article analyses exposure to different sources of campaign information, and their effects on citizens' feeling of being informed about referendums. The analysis is based on an innovative rolling panel study that allows for a rigorous tracking of campaign dynamics in the run-up to the referendum. Using a referendum on a large-scale infrastructure project in the German state of Baden-Wurttemberg, empirical findings show that official information provided by the government had the greatest effect in reaching citizens and also had the strongest impact on their feeling of being informed. The article demonstrates that the state plays a crucial role in providing an appropriate information env…

Detecting the chaotic nature of advection in complex river flows

2012

In order to detect signatures of chaotic advection in river surface motion, surface buoys equipped with GPS were deployed in a field experiment in River Danube, Hungary. The buoys were released in the vicinity of groynes where complex mixing processes occur. A detailed analysis of the trajectories was carried out, focusing on the time evolution of the distance between buoy pairs. The analysis included the determination and comparison of local Lyapunov exponents and prediction times of finite-time hyperbolic behaviour, which is related to strong mixing. Despite of the small number of applied buoys we found evidence on Lagrangian chaos in the wake of a groyne field. In order to supplement the…

A comparative analysis of two immersive virtual reality systems in the integration and visualization of natural hand interaction

2022

AbstractIt is generally accepted that the use of natural interaction provides a positive impact in Virtual Reality (VR) applications. Therefore, it is important to understand what is the best way to integrate and visualize this feature in VR. For this reason, this paper presents a comparative study of the integration of natural hand interaction in two immersive VR systems: a Cave Audio Visual Experience (CAVE) system –where users’ real hands are visible– and a non-see-through Head-Mounted Display (HMD) system –where only a virtual representation of the hands is possible–. In order to test the suitability of using this type of interaction in a CAVE and compare it to an HMD, we raise six rese…

Fast, Reliable Head Tracking Under Varying Illumination

2003

An improved technique for 3D head tracking under varying illumination conditions is proposed. The head is modeled as a texture mapped cylinder. Tracking is formulated as an image registration problem in the cylinder's texture map image. To solve the registration problem in the presence of lighting variation and head motion, the residual error of registration is modeled as a linear combination of texture warping templates and orthogonal illumination templates. Fast and stable on-line tracking is then achieved via regularized weighted least squares minimization of the registration error. The regularization term tends to limit potential ambiguities that arise in the warping and illumination te…

Head Tracking via Robust Registration in Texture Map Images.

1998

A novel method for 3D head tracking in the presence of large head rotations and facial expression changes is described. Tracking is formulated in terms of color image registration in the texture map of a 3D surface model. Model appearance is recursively updated via image mosaicking in the texture map as the head orientation varies. The resulting dynamic texture map provides a stabilized view of the face that can be used as input to many existing 2D techniques for face recognition, facial expressions analysis, lip reading, and eye tracking. Parameters are estimated via a robust minimization procedure; this provides robustness to occlusions, wrinkles, shadows and specular highlights. The syst…