Search results for "simulators"
showing 9 items of 9 documents
Graded-index optical fiber emulator of an interacting three-atom system: illumination control of particle statistics and classical non-separability
2019
[EN] We show that a system of three trapped ultracold and strongly interacting atoms in one-dimension can be emulated using an optical fiber with a graded-index profile and thin metallic slabs. While the wave-nature of single quantum particles leads to direct and well known analogies with classical optics, for interacting many-particle systems with unrestricted statistics such analoga are not straightforward. Here we study the symmetries present in the fiber eigenstates by using discrete group theory and show that, by spatially modulating the incident field, one can select the atomic statistics, i.e., emulate a system of three bosons, fermions or two bosons or fermions plus an additional di…
Development of a Simulator for Prototyping Reinforcement Learning-Based Autonomous Cars
2022
Autonomous driving is a research field that has received attention in recent years, with increasing applications of reinforcement learning (RL) algorithms. It is impractical to train an autonomous vehicle thoroughly in the physical space, i.e., the so-called ’real world’; therefore, simulators are used in almost all training of autonomous driving algorithms. There are numerous autonomous driving simulators, very few of which are specifically targeted at RL. RL-based cars are challenging due to the variety of reward functions available. There is a lack of simulators addressing many central RL research tasks within autonomous driving, such as scene understanding, localization and mapping, pla…
European Respiratory Society statement on sleep apnoea, sleepiness and driving risk
2021
Obstructive sleep apnoea (OSA) is highly prevalent and is a recognised risk factor for motor vehicle accidents (MVA). Effective treatment with continuous positive airway pressure has been associated with a normalisation of this increased accident risk. Thus, many jurisdictions have introduced regulations restricting the ability of OSA patients from driving until effectively treated. However, uncertainty prevails regarding the relative importance of OSA severity determined by the apnoea–hypopnoea frequency per hour and the degree of sleepiness in determining accident risk. Furthermore, the identification of subjects at risk of OSA and/or accident risk remains elusive. The introduction of off…
Development of a Hybrid Method to Generate Gravito-Inertial Cues for Motion Platforms in Highly Immersive Environments
2021
Motion platforms have been widely used in Virtual Reality (VR) systems for decades to simulate motion in virtual environments, and they have several applications in emerging fields such as driving assistance systems, vehicle automation and road risk management. Currently, the development of new VR immersive systems faces unique challenges to respond to the user’s requirements, such as introducing high-resolution 360° panoramic images and videos. With this type of visual information, it is much more complicated to apply the traditional methods of generating motion cues, since it is generally not possible to calculate the necessary corresponding motion properties that are needed to …
Virtuālās realitātes spēle “VHOUSE”
2022
Kvalifikācijas darbā ir aprakstīta Android operētājsistēmas virtuālās realitātes spēles izstrāde un tās prasību specifikācija. Lietotne izstrādāta C# programmēšanas valodā, izmantojot Unity starp platformu spēļu dzinēju. Lietotne funkcionē kā leļļu mājas simulators. Lietotājam spēlē ir pieejamas vairākas interaktīvas funkcijas. Lietotājs, pievienojot spēles ainai mājas kontrolierus un istabas, var būvēt spēles ainā mājas, pievienojot istabas mājas kontrolieriem. Lietotājs var dekorēt istabas un apkārtni ar dažādiem mēbeļu veidiem. Kā arī lietotājs var pievienot spēles ainai rotaļlietas ar kurām var spēlēties paša izveidotajā virtuālajā leļļu mājā. Lietotājs spēles progresu var saglabāt un t…
On the Correlation and Ergodic Properties of the Squared Envelope of SOC Rayleigh Fading Channel Simulators
2012
Published version of an article in the journal: Wireless Personal Communications. Also available from the publisher at: http://dx.doi.org/10.1007/s11277-011-0493-2 In this paper, we investigate the correlation and ergodic properties of the squared envelope of a class of autocorrelation-ergodic (AE) sum-of-cisoids (SOC) simulation models for mobile Rayleigh fading channels. Novel closed-form expressions are presented for both the ensemble and the time autocorrelation functions (ACFs) of the SOC simulation model’s squared envelope. These expressions have been derived by assuming that the SOC model’s inphase and quadrature (IQ) components have arbitrary autocorrelation and cross-correlation pr…
The Influence of the feedback control of the hexapod platform of the SAAM dynamic driving simulator on neuromuscular dynamics of the drivers
2012
Multi sensorial cues (visual, auditory, haptic, inertial, vestibular, neuromuscular) [Ang2] play important roles to represent a proper sensation (objectively) and so a perception (subjectively as cognition) in driving simulators. Driving simulator aims at giving the sensation of driving as in a real case. For a similar situation, the driver has to react in the same way as in reality in terms of ‘self motion’. To enable this behavior, the driving simulator must enhance the virtual immersion of the subject in the driving situation. The subject has to perceive the motion of his own body in the virtual scene of the virtual car as he will have in a real car. For that reason, restituting the iner…
An Exact Solution for the Level-Crossing Rate and the Average Duration of Fades of the Envelope of Sum-of-Cisoids Processes
2012
Authors version of an article published in the journal: Procedia Technology. Also available from the publisher at: http://dx.doi.org/10.1016/j.protcy.2012.03.004 Sum-of-cisoids (SOC) processes provide a physically and numerically appealing framework for the modelling and simulation of a wide class of mobile radio channels. This paper is concerned with the problem of finding a general solution for the level-crossing rate (LCR) and the average duration of fades (ADF) of the envelope of SOC processes. Exact expressions are derived for the LCR and the ADF by taking into account that the inphase component, the quadrature component, and the time derivatives of the inphase and quadrature component…
Dzelzceļa signālu simulators šķēršļu un darba vietu norobežošanai
2021
Kvalifikācijas darba ietvaros, autors ir izstrādājis programmu, kuru izmanto topošie dzelzceļa darbinieki. Sistēma notiek apmācības un zināšanu pārbaude saistībā ar drošības pasākumu ievērošanu veicot remonta un apkalpošanas darbus uz dzelzceļa līnijām. Sistēmas galvenās funkcijas ir saistītas ar testa jautājumu izveidi, lietotāju kontu pārvaldi, apmācības procesu, eksāmenu norisi un rezultātu žurnalēšanu. Tīmekļa lietotne tika izstrādāta, izmantojot programmēšanas valodu JavaScript, HTML iezīmēšanas valodu, CSS stila lapas valodu. Izmantoti Meteor un React ietvari un MongoDB datubāze. Darba rezultāts ir funkcionālajām prasībām atbilstoša, intuitīva sistēma, kuru izmanto vairākās mācību ies…