Search results for "platform"
showing 10 items of 488 documents
Genetic and environmental contribution to postural balance of older women in single and dual task situations
2005
Abstract The purpose of the present study was to examine the effect of a second task on postural balance and to determine the role of genetic influences on postural balance when dual tasking among 206 monozygotic and 227 dizygotic female twins, aged 63–76 years. Balance was measured as medio-lateral and antero-posterior velocity of the centre of pressure (COP) (mm/s) and velocity moment (mm2/s) while standing on a force platform. Doing an arithmetic task increased movement of the COP while the hand motor task had no effect on movement of the COP. The genetic contribution to balance in the single task situation was minor (14%, 95% confidence interval, CI: 11–35%) whereas in the dual task sit…
Contribution of genetic and environmental effects to postural balance in older female twins
2003
The aim of the present study was to determine the relative roles of genetic and environmental influences on postural balance in older women. The participants were 97 monozygotic (MZ) and 102 dizygotic (DZ) female twins, aged 64–76 yr. Postural sway was measured during side-by-side stance with eyes open and eyes closed, and during semitandem stance with eyes open on a force platform. Sway data were condensed into four first-order and one second-order latent factors. The second-order factor, named balance, incorporates sway data from multiple tests and thus best describes the phenotype of postural balance. The contribution of genetic and environmental influences on the variability of the lat…
Force Platform Balance Measures as Predictors of Indoor and Outdoor Falls in Community-Dwelling Women Aged 63-76 Years
2008
Background. Inability to maintain balance while standing increases risk of falls in older people. The present study assessed whether center of pressure (COP) movement measured with force platform technology predicts risk for falls among older people with no manifest deficiency in standing balance. Methods. Participants were 434 community-dwelling women, aged 63-76 years. COP was measured in six stances on a force platform. Following balance tests, participants reported their falls with 12 monthly calendars. Incidence rate ratios (IRR) with 95% confidence intervals (CI) were computed from negative binomial regression models. For the analysis, those with>/=1 fall indoors were coded"indoor fal…
Balance control in aging: improvements in anticipatory postural adjustments and updating of internal models
2015
International audience; Postural stability of older subjects can be estimated during orthostatic equilibrium. However, dynamic equilibrium is also important to investigate risks of fall. It implies different interpretations of measures given by force plates. Same dependant variables (e.g. center of pressure displacement) cannot be interpreted the same ways depending of the type of equilibrium that is investigated. In particular, sways increases during dynamic equilibrium and before movement execution may reflect an improvement of feedforward control.
Determinants of elite-level air rifle shooting performance
2015
This study focused on identifying the most important factors determining performance in elite-level air rifle shooting technique. Forty international- and national-level shooters completed a simulated air rifle shooting competition series. From a total of 13 795 shots in 319 tests, shooting score and 17 aiming point trajectory variables were measured with an optoelectronic device and six postural balance variables were measured with force platform. Principal component analysis revealed six components in the air rifle shooting technique: aiming time, stability of hold, measurement time, cleanness of triggering, aiming accuracy, and timing of triggering. Multiple regression analysis identifie…
Osservazioni su contratti algoritmici e tutela del consumatore nell’economia di piattaforma
2020
Il saggio prende in esame alcune delle tutele predisposte dalla direttiva 2019/2161 del Parlamento e del Consiglio in favore del consumatore, nell’ipotesi in cui quest’ultimo sia assistito, nell’incontro con il professionista, dall’uso di tecnologie computazionali: con una espressione di sintesi, l’Autore si riferisce a questa evenienza con la locuzione “contratti algoritmici”. Tre sono gli aspetti cui si dirige l’attenzione: 1) la specificità dell’economia di piattaforma, luogo privilegiato in cui gli algoritmi orientano le scelte di consumo; 2) gli algoritmi che sono adoperati nell’atto di consumo; 3) l’ottimizzazione dei prezzi tramite profilazione automatizzata, quale caso paradigmatico…
Vienotas platformas izstrāde Android mobilo ierīču komunikācijas lietotņu testēšanā
2020
Maģistra darba ietvaros ir izveidota veiktspējas testu automatizācijas platforma Android ierīcēm, kura apvieno audio, tīkla ierobežošanas un tveršanas un baterijas patēriņa testus. Papildus tika veikta literatūras analīze un izzināti interneta resursi par to vai eksistē rīks, platforma, kas atbalsta dažāda veida veiktspējas testu automatizāciju, to izveidošanu un izpildi. Tika ievākta informācija par veiktspējas testu (audio, tīkla ierobežošanas un tveršanas un baterijas patēriņa testiem) galvenajām metrikām un iespējām tās noteikt. Pēc tam tika izpētīta un apkopota informācija par veiktspējas testu automatizācijas iespējām un nepieciešamajiem parametriem to veikšanai. Kas tālāk kalpoja par…
Quantum state engineering using one-dimensional discrete-time quantum walks
2017
Quantum state preparation in high-dimensional systems is an essential requirement for many quantum-technology applications. The engineering of an arbitrary quantum state is, however, typically strongly dependent on the experimental platform chosen for implementation, and a general framework is still missing. Here we show that coined quantum walks on a line, which represent a framework general enough to encompass a variety of different platforms, can be used for quantum state engineering of arbitrary superpositions of the walker's sites. We achieve this goal by identifying a set of conditions that fully characterize the reachable states in the space comprising walker and coin, and providing …
No platformas neatkarīgu mobilo lietotņu izstrāde ar rīku Apache Cordova
2015
Lai ar mobilo lietotņu palīdzību piesaistītu lielāku lietotāju skaitu, izstrādātājiem ir jāapgūst vairākas programmēšanas valodas un izstrādes vides. Apache Cordova projekts ir viens no populārākajiem no platformas neatkarīgu lietotņu izstrādes rīkiem un ļauj izstrādātājiem izstrādāt mobilās lietotnes vairākām mobilajām platformām, izmantojot plaši pielietotas tīmekļa tehnoloģijas – HTML, CSS un JavaScript. Galvenais darba mērķis ir izpētīt rīka Apache Cordova piedāvātās iespējas, noskaidrot Cordova lietotņu izstrādes procesa specifiku un salīdzināt gūto pieredzi ar specifisku platformu mobilo lietotņu izstrādi, koncentrējoties uz izstrādes laiku ietekmējošajiem faktoriem, tehnoloģiju dokum…
Dizaina un struktūrskices izstrāde virtuālās realitātes platformai
2021
Projektā “VR SafeScaff” tiek risināta problēma par atbilstošu lietotāja pieredzes un lietotāja saskarnes izstrādi, kas nodrošina pēc iespējas ērtāku un uztveramāku lietojamību un dizainu, balstoties uz vairāku pētījumu rezultātiem. Darba mērķis ir izstrādāt struktūrskici un dizainu virtuālās realitātes projektam “VR SafeScaff”. Darba rezultātā tika izveidota dizaina struktūrskice virtuālās realitātes platformai “VR SafeScaff”, kura arī tika veiksmīgi implementēta pirmajā programmatūras versijā. Apmācības platformas pirmo versiju arī aplūkoja neatkarīgi lietotāji un būvniecības nozares lietotāji, kuri deva savus ieteikumus tā turpmākai projekta attīstībai un uzlabojumiem. Darba apjoms – 68. …