The security of online assessments is a major concern due to widespread cheating. One common form of cheating is impersonation, where students invite unauthorized persons to take assessments on their behalf. Several techniques exist to handle impersonation. Some researchers recommend use of integrity policy, but communicating the policy effectively to the students is a challenge. Others propose authentication methods like, password and fingerprint; they offer initial authentication but are vulnerable thereafter. Face recognition offers post-login authentication but necessitates additional hardware. Keystroke Dynamics (KD) has been used to provide post-login authentication without any additional hardware, but its use is limited to subjective assessment. In this work, we address impersonation in assessments with Multiple Choice Questions (MCQ). Our approach combines two key strategies: reinforcement of integrity policy for prevention, and keystroke-based random authentication for detection of impersonation. To the best of our knowledge, it is the first attempt to use keystroke dynamics for post-login authentication in the context of MCQ. We improve an online quiz tool for the data collection suited to our needs and use feature engineering to address the challenge of high-dimensional keystroke datasets. Using machine learning classifiers, we identify the best-performing model for authenticating the students. The results indicate that the highest accuracy (83%) is achieved by the Isolation Forest classifier. Furthermore, to validate the results, the approach is applied to Carnegie Mellon University (CMU) benchmark dataset, thereby achieving an improved accuracy of 94%. Though we also used mouse dynamics for authentication, but its subpar performance leads us to not consider it for our approach.
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Background and objectivesBefore the Covid-19 pandemic, important social studies already indicated the severe negative feedback associated with high-rise developments. During the Covid-19 pandemic, citizens were confronted with their neighbourhoods’ insufficient restorative capacity to maintain their health and well-being. New methods are urgently required to analyse and learn from existing high-density developments to prevent a repetition of past mistakes and to catalyse the salutary effects of architecture in new developments.Process and methods (for empirical research)The Sensing Streetscapes research investigated the potential of emerging biometric technologies to examine the effects of commonly applied urban design principles in six western cities. In one outdoor and four laboratory tests, eye-tracking technology with sound-recording and Galvanic Skin Response captured subjects’ (un)conscious attention patterns and arousal levels when viewing streets on eye level. Triangulation with other techniques, such as mouse tracking to record participants’ appreciation value and expert panels from spatial design practice, showed the positive and negative impact of stimuli.Main results (or main arguments in the case of critical reviews)The preliminary results provide a dynamic understanding of urban experience and how it is affected by the presence or absence of design principles. The results suggest that streets with high levels of detail and variety may contribute to a high level of engagement with the built environment. It also shows that traffic is likely an important factor in causing stress and diminishing the restorative capacity society seeks.Implications for research and practice/policy | Importance and originality of the contributionThe research study led to the development of a Dynamic User Experience Assessment (D-UXA) tool that supports researchers and designers in understanding the impact of design decisions on users’ experience, spatial perception and (walking) behaviour. D-UXA enables a human-centred analysis and is designed to fill the gap between traditional empirical methods and aspirations for an evidence-based promotion of human health and wellbeing in (high-density) urban developments.
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De incidentie van niet aangeboren hersenletsel (NAH) bij personen in de leeftijd tot 25 jaar in Nederland is aanzienlijk, met ca. 18.000 nieuwe gevallen per jaar. Kinderen en jongeren met NAH hebben naast fysieke, cognitieve en emotionele beperkingen, een significant lager niveau van sociale participatie dan hun gezonde leeftijdgenoten. Het gebruik van de Nintendo Wii, een spelcomputer die bewegingen op natuurlijke en intuïtieve wijze uitlokt, lijkt mogelijkheden te bieden om contacten met anderen en actieve vrijetijdsbesteding bij jongeren met NAH te stimuleren. In deze studie wordt onderzocht wat het effect is van het gebruik van de Nintendo Wii bij kinderen en jongeren met NAH op fysiek, cognitief en sociaal functioneren. Om dit te onderzoeken is een multicenter, observationele pilotstudie verricht, bij 50 kinderen en jongeren met NAH in de leeftijd van 6-29 jaar die onder controle of behandeling zijn van een revalidatiearts. De interventie, van in totaal 12 weken, startte met 2 trainingssessies van 60 minuten, waarbij de toe te passen games werden gekozen passend bij zelf gekozen behandeldoelen (te verbeteren functies of activiteiten) en uitvoerbaar gezien de individuele beperkingen van de deelnemer. Vervolgens werd er minimaal 2 keer in de week gegamed. Er was wekelijks contact met een therapeut per telefoon of e-mail. De effectmetingen (vragenlijsten en een neuropsychologische test) werden verricht aan het begin en einde van de interventie en betroffen het fysiek, cognitief en sociaal functioneren. De statistische analyse bestond uit vergelijkingen van de uitkomstmaten tussen 0 en 12 weken met behulp van gepaarde t-toetsen, Wilcoxon-Signed-Rank tests en chi-kwadraat toetsen. Deze eerste pilotstudie naar de effecten van het gamen met de Nintendo Wii bij jongeren met NAH laat significante verbetering zien op het fysiek en cognitief functioneren, en niet op het sociaal functioneren. Deze resultaten zijn aanleiding om de effectiviteit van de Nintendo Wii in deze patiëntengroep in een grotere, gecontroleerde studie verder te onder ABSTRACT Aim: To explore the effects of usage of the Nintendo Wii on physical, cognitive and social functioning in patients with acquired brain injury (ABI). Methods: This multicenter, observational proof-of-concept study included children, adolescents and young adults with ABI aged 6-29 years. A standardized, yet individually tailored 12-week intervention with the Nintendo Wii was delivered by trained instructors. The treatment goals were set on an individual basis and included targets regarding physical, mental and/or social functioning. Outcome assessments were done at baseline and after 12 weeks, and included: the average number of minutes per week of recreational physical activity; the CAPE (Children's Assessment of Participation and Enjoyment); the ANT (Amsterdam Neuropsychological Tasks); the achievement of individual treatment goals (Goal Attainment Scaling); and quality of life (PedsQL; Pediatric Quality of Life Inventory). Statistical analyses included paired t-tests or Wilcoxon-Signed-Rank tests. Results: 50 patients were included, (31 boys and 19 girls; mean age 17.1 years (SD 4.4)), of whom 45 (90%) completed the study. Significant changes of the amount of physical activity, speed of information processing, attention, response inhibition and visual-motor coordination (p<0.05) were seen after 12 weeks, whereas there were no differences in CAPE or PedsQL scores. Two-thirds of the patients reported an improvement of the main treatment goal. Conclusion: This study supports the potential benefits of gaming in children and youth with ABI.
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