Browsing by Keyword "Usability"
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Item A Blockchain-Based Audit Trail Mechanism: Design and Implementation: Design and implementation(2021-11-26) Regueiro, Cristina; Seco, Iñaki; Gutiérrez-Agüero, Iván; Urquizu, Borja; Mansell, Jason; Tecnalia Research & Innovation; CIBERSEC&DLTAudit logs are a critical component in today’s enterprise business systems as they provide several benefits such as records transparency and integrity and security of sensitive information by creating a layer of evidential support. However, current implementations are vulnerable to attacks on data integrity or availability. This paper presents a Blockchain-based audit trail mechanism that leverages the security features of Blockchain to enable secure and reliable audit trails and to address the aforementioned vulnerabilities. The architecture design and specific implementation are described in detail, resulting in a real prototype of a reliable, secure, and user-friendly audit trail mechanism.Item A foot drop compensation device based on surface multi-field functional electrical stimulation—Usability study in a clinical environment(2019) Imatz-Ojanguren, Eukene; Sánchez-Márquez, Gema; Asiain-Aristu, Jose Ramón; Cueto-Mendo, Joxean; Jaunarena-Goicoechea, Edurne; Zabaleta, Haritz; Keller, Thierry; Tecnalia Research & InnovationFunctional electrical stimulation applies electrical pulses to the peripheral nerves to artificially achieve a sensory/motor function. When applied for the compensation of foot drop it provides both assistive and therapeutic effects. Multi-field electrodes have shown great potential but may increase the complexity of these systems. Usability aspects should be checked to ensure their success in clinical environments. We developed the Fesia Walk device, based on a surface multi-field electrode and an automatic calibration algorithm, and carried out a usability study to check the feasibility of integrating this device in therapeutic programs in clinical environments. The study included 4 therapists and 10 acquired brain injury subjects (8 stroke and 2 traumatic brain injury).Item Human-Centered Design Components in Spiral Model to Improve Mobility of Older Adults(Springer, Cham, 2019) Khakurel, Jayden; Porras, Jari; Melkas, Helinä; Garzo, Ainara; Medical TechnologiesAs humans grow older, their cognitive needs change more frequently due to distal and proximal life events. Designers and developers need to come up with better designs that integrate older users’ needs in a short period of time with more interaction with the users. Therefore, the positioning of human end users in the center of the design itself is not the key to the success of design artifacts while designing applications for older adults to use a smartphone as a promising tool for journey planner while using public transportation. This study analyzed the use of human-centered design (HCD) components, the spiral model, and the design for failure (DfF) approach to improve the interactions between older users and designers/developers in gathering usability needs in the concept stage and during the development of the app with short iterative cycles. To illustrate the importance of the applied approach, a case study with particular focus on older adults is presented.Item Usability study of a device for compensation of foot drop based on FES and surface multi-field electrodes in a clinical environment(2017-07) Imatz-Ojanguren, Eukene; Sánchez-Márquez, Gema; Asiain-Aristu, Jose Ramón; Cueto-Mendo, Joxean; Jaunarena-Goicoechea, Edurne; Zabaleta, Haritz; Keller, Thierry; Tecnalia Research & InnovationFunctional Electrical Stimulation (FES) has shown successful assistive and rehabilitation effects in people affected by foot drop dysfunction caused by neurological disorders [1]. Still, FES-based foot drop devices are not present in regular therapy programs of many countries due to barriers caused by technological, usability or reliability issues [2]. FES devices based on surface multi-field electrodes bring new broader stimulation possibilities and features like compensation of eversion/inversion and thus, potentially increase the configuration options. In this study, the satisfaction and usability aspects of a multi-field based FES device were analyzed in a clinical environment. Method The FES device used in this study was the Fesia Walk device for compensation of foot drop, which is based on a multi-field surface electrode and an inertial sensor for gait phase detection. 10 acquired brain injury subjects in chronic stage and 4 therapists participated in the study. The therapists received a two-hour training session prior to the therapy sessions. Every subject was assigned to one therapist and received 3 sessions of habituation and 6 sessions of over ground walking with the Fesia Walk during three weeks. Both therapists and users were evaluated with the Quebec User Evaluation of Satisfaction with Assistive Technology (QUEST). Additionally, the therapists were evaluated with the System Usability Scale (SUS). An individual interview was carried out with each of the participants. Results The device received good scores in both the QUEST and SUS scales, with mean scores of 4.14 out of 5 and 85.6 out of 100 respectively. Furthermore, most users and all therapists showed interest to continue using the device after the study. Discussion and conclusions This usability study indicated that it is possible to include surface multi-field based FES devices for the compensation of foot drop in practical therapeutic programs and that they can be used as regular tools by therapists in clinical environments.