Search results for "Contactless"

SHARP: Environment and Person Independent Activity Recognition with Commodity IEEE 802.11 Access Points

2022

In this article we present SHARP, an original approach for obtaining human activity recognition (HAR) through the use of commercial IEEE 802.11 (Wi-Fi) devices. SHARP grants the possibility to discern the activities of different persons, across different time-spans and environments. To achieve this, we devise a new technique to clean and process the channel frequency response (CFR) phase of the Wi-Fi channel, obtaining an estimate of the Doppler shift at a radio monitor device. The Doppler shift reveals the presence of moving scatterers in the environment, while not being affected by (environment-specific) static objects. SHARP is trained on data collected as a person performs seven differe…

Inductive Power Transfer for 100W battery charging

2013

Today, Inductive Power Transfer (IPT) is widely investigated to provide wireless battery charge. Potential applications range from a few Watts of handheld devices to kWatts of automotive applications. Despite of comfort and safety options, wireless charging features relatively poor power conversion efficiency. In the literature, several solutions are proposed addressing efficiency related issues. In this paper, a 100W wireless charging station for electric bikes which improves the power conversion efficiency is proposed. The magnetic structure design is analyzed thoroughly as well as the proposed power electronics system architectures of both the power transmitter and power receiver. The ef…

Vers le développement d'un capteur photoplétysmographique sans contact

2019

Heart-rate estimation performed with remote photoplethysmography is a very active research field. Since pioneer works in 2010, which demonstrated the feasibility of the measure with low-grade consumers’ camera (webcam), the number of scientific publications have increased significantly in the domain. Hence, we observe a multiplication of the methods in order to retrieve the photoplethysmographic signal which has led to an increased precision and quality of the heart-rate estimation. Region of interest segmentation is a key step of the processing pipeline in order to maximize the quality of the measured signal. We propose a new method to perform remote photoplethysmographic measurement using…

Wireless Charging Systems for Electric Vehicle Batteries

Operazioni di pagamento tramite wallet e responsabilità da omessa applicazione della strong customer authentication

2022

Lo scritto commenta una recente decisione del Collegio di Coordinamento ABF a proposito del riparto di responsabilità tra intermediario emittente una carta di pagamento e cliente, in caso di operazioni abusivamente realizzate da terzi tramite «wallet». Il Collegio, analizzando la disciplina in tema di servizi di pagamento elettronici e di « Strong Customer Authentication », precisa come l’indagine del caso vada in primo luogo condotta verificando che l’intermediario abbia fornito la prova della corretta applicazione dell’autenticazione forte in ogni fase delle transazioni abusivamente compiute. Ove tale prova non sia fornita, egli dovrà restituire quanto dal cliente abusivamente versato. Th…

Examining Consumers’ Usage Intention of Contactless Payment Systems

2019

Purpose The purpose of this paper is to develop and test a conceptual model that combines the modified Unified Theory of Acceptance and Use of Technology (UTAUT2) with a consumer brand engagement (CBE) model to predict consumers’ usage intentions toward contactless payment systems in a developed country. Design/methodology/approach The authors cooperated with a contactless payment service provider in Finland and reached out to 22,000 customers, resulting in 1,165 usable responses. The collected data were analyzed using structural equation modeling. Findings The study shows that the UTAUT2 and the CBE model together explain approximately 70 percent of the variance in usage intention. Of the…