Alexander Mertens

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Elderly users suffering from hand tremor have difficulties interacting with touchscreens because of finger oscillation. It has been previously observed that sliding one's finger across the screen may help reduce this oscillation. In this work, we empirically confirm this advantage by (1) measuring finger oscillation during different actions and (2)(More)
Tremor patients are frequently facing problems when interacting with IT systems and services. They do not reach the same levels of input efficiency and easily become unhappy with a technology they do not perceive as a general asset. Cases of Intention tremor show a significant comparative rise in inaccurate movement towards a real button or virtual buttons(More)
PURPOSE A wealth of mobile applications are designed to support users in their drug intake. When developing software for patients, it is important to understand the differences between individuals who have, who will or who might never adopt mobile interventions. This study analyzes demographic and health-related factors associated with real-life "longer(More)
Figure 1: A web browser for users with tremor solely operated by Swabbing: sliding towards a target. Abstract Typical touchscreen devices are not usable for users with a persistent hand tremor. In this paper, we discuss how the involuntary jittering movements of tremor influences users' input on touchscreens. Drawing from these effects, we describe a(More)
Wearable devices like activity tracker, measuring motion and steps, enable users to monitor their behaviour and might support a healthier lifestyle. These wearables might also motivate elderly to be active and live healthy. Unfortunately they are mostly designed for younger users and it is unclear if they are usable by older adults. In order to answer this(More)
In semi-trailer assembly, workers are exposed to several physical risk factors. Awkward working postures have not yet been investigated in semi-trailer assembly, although they are known to be a major risk factor for musculoskeletal disorders. We therefore conducted a comprehensive ergonomic analysis of working postures using the Ovako working posture(More)
This age-differentiated study investigated preferences for new digital, situation-adaptive escape route signage with informative and flashing elements under simulated emergency conditions of tilted passenger ships. The decision-making behaviour of 26 young (20-30 years) and 26 elderly (60-77 years) participants was observed in four conditions varying in(More)