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Wassenaar, Arjen (author)The use of geometric anti-springs (GASs) in MEMS accelerometers can not only boost the sensitivity through the static balancing effect, it also introduces the capability to tune the stiffness post-manufacturing by adjusting the balancing force. This paper addresses the challenge of mechanically fine-tuning the stiffness to create the potential...master thesis 2024
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Muxica, Diego (author), Rivera, Sebastian (author), Orchard, Marcos E. (author), Ahumada, Constanza (author), Jaramillo, Francisco (author), Bravo, Felipe (author), Gutiérrez, José M. (author), Astroza, Rodrigo (author)This paper presents the design, implementation, and validation of an on-blade sensor system for remote vibration measurement for low-capacity wind turbines. The autonomous sensor system was deployed on three wind turbines, with one of them operating in harsh weather conditions in the far south of Chile. The system recorded the acceleration...journal article 2024
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Siemes, C. (author), van den IJssel, J.A.A. (author), Visser, P.N.A.M. (author)Thermosphere mass density and crosswind can be derived from accelerometer and GNSS tracking data. However, present datasets are often provided without comprehensive uncertainty specifications. We present a newly developed method that propagates measurement noise and errors in the satellite specification, thermosphere models, and radiation flux...journal article 2024
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Kraaijkamp, J.J.M. (author), Stijntjes, M. (author), de Groot, J.H. (author), Chavannes, N.H. (author), Achterberg, Wilco P. (author), van Dam van Isselt, E.F. (author)The aim of this study was to quantify physical activity and sedentary behavior in older adults recovering from hip fracture and to identify groups based on movement patterns. In this cross-sectional cohort study, older adults (≥70 years) were included 3 months after surgery for proximal femoral fracture. Patients received an accelerometer for...journal article 2024
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Sharma, Suryansh (author), Verhoeff, Mike (author), Joosen, Floor (author), Venkatesha Prasad, Ranga Rao (author), Hamaza, S. (author)The increasing popularity of helium-assisted blimps for extended monitoring or data collection applications is hindered by a critical limitation &#x2013; single-point failure when the balloon malfunctions or bursts. To address this, we introduce <bold>Janus</bold>, a hybrid blimp-drone platform equipped with integrated balloon...journal article 2024
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Oudhuis, Waded (author)Computers having the ability to estimate intentions to speak can improve human-computer interaction. While plenty of research has been done on next-speaker prediction, they differ from intentions to speak since these rely only on the person themselves. Previous research was done on inferring intentions to speak using accelerometer data with some...bachelor thesis 2023
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Stokman, Charlotte (author)The energy market is growing and noise regulations for offshore foundation pile installation grow stricter. New initiatives arise to comply with the ongoing developments in the field, such as the BLUE Piling Technology under development by IQIP. Its features are presented as reduced underwater noise levels during installation, which is attibuted...master thesis 2023
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Yao, X. (author), Yang, Y. (author), Vledder, G. (author), Xu, J. (author), Song, Y. (author), Vink, P. (author)Wearables are used to recognize human activities in various applications. However, there is limited evidence on the comfort feelings in using wearables, which is crucial for the adoption and long-term engagement of users in those applications. In this paper, we propose the concept of comfort wearables in the context of in-flight posture...journal article 2023
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Dayside Upper-Thermospheric Density Fluctuations as Observed by GRACE and GRACE-FO at ∼500 km HeightPark, Jaeheung (author), van den IJssel, J.A.A. (author), Siemes, C. (author)We statistically investigate fluctuation amplitudes (normalized to the background values) of dayside low-/mid-latitude upper-thermospheric mass density as observed by the Gravity Recovery and Climate Experiment (GRACE) and GRACE-Follow-On (GRACE-FO) spacecraft at ∼500 km altitude between 2002 and 2022. There are three new findings in our...journal article 2023
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Vargas Quiros, J.D. (author), Kapcak, Oyku (author), Hung, H.S. (author), Cabrera Quiros, L.C. (author)Interpersonal attraction is known to motivate behavioral responses in the person experiencing this subjective phenomenon. Such responses may involve the imitation of behavior, as in mirroring or mimicry of postures or gestures, which have been found to be associated with the desire to be liked by an interlocutor. Speed dating provides a...journal article 2023
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Claassen, Carlijn (author)The combination of the high number and the consequences of falls in older adults led to the development of fall risk assessments; non-sensor-based and sensor-based. Multiple studies used ML for older adults' fall risk prediction using raw IMU data. This study's objective was to develop a DL algorithm that predicts the fall risk of people living...master thesis 2022
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Mingione, Fabio (author)Reaction wheels are often the main contributor to microvibrations on satellites. These vibrations are a source of pointing errors and therefore need to be limited as much as possible. The miniaturization trend in the space industry and universities fostered the production of very small reaction wheels, suited to Cubesat and PocketQube scales. A...master thesis 2022
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Groenendijk, Mark (author)The goal for this paper is to find out what the smart badge provided by the Social Perceptive Computive Lab (SPCL) group is and what it contains. The sensors that are used in the smart badge are the Accelerometer, Gyroscope and Magnetometer. The main question of this paper is ”What is the benefit of using full 9-DOF IMU data in predicting...bachelor thesis 2022
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Otero, Malena D’Elia (author), de Abreu, Ana Elisa Silva (author), Askarinejad, A. (author), Guimarães, Marcela Penha Pereira (author), de Macedo, Eduardo Soares (author), Corsi, Alessandra Cristina (author), de Almeida, Rynaldo Zanotele Hemerly (author)Early Warning Systems (EWS) are non-structural measures for landslides disaster prevention. They are based on the detection of impending failure signals. The results of a landslide simulation experiment where accelerometers were used to identify pre-failure signals are presented in this paper. Landslide was simulated in a tilting flume filled...journal article 2022
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Mishra, A. (author), Rajan, R.T. (author)Given a network of N static nodes in D-dimensional space and the pairwise distances between them, the challenge of estimating the coordinates of the nodes is a well-studied problem. However, for numerous application domains, the nodes are mobile and the estimation of relative kinematics (e.g., position, velocity and acceleration) is a...conference paper 2022
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Touboul, Pierre (author), Métris, Gilles (author), Rodrigues, Manuel (author), Bergé, Joel (author), Robert, Alain (author), Baghi, Quentin (author), André, Yves (author), Bedouet, Judicael (author), Visser, P.N.A.M. (author)The space mission MICROSCOPE dedicated to the test of the equivalence principle (EP) operated from April 25, 2016 until the deactivation of the satellite on October 16, 2018. In this analysis we compare the free-fall accelerations (a <sub>A</sub> and a <sub>B</sub>) of two test masses in terms of the Eötvös parameter η ( A,B ) = 2 a A − a B a...journal article 2022
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Gas-surface interactions modelling influence on satellite aerodynamics and thermosphere mass densityMarch, G. (author), van den IJssel, J.A.A. (author), Siemes, C. (author), Visser, P.N.A.M. (author), Doornbos, Eelco N. (author), Pilinski, Marcin (author)The satellite acceleration data from the CHAMP, GRACE, GOCE, and Swarm missions provide detailed information on the thermosphere density over the last two decades. Recent work on reducing errors in modelling the spacecraft geometry has greatly reduced scale differences between the thermosphere data sets from these missions. However, residual...journal article 2021
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The Stumblemeter: Design and Validation of a System That Detects and Classifies Stumbles during Gaitden Hartog, D.D.G. (author), Harlaar, J. (author), Smit, G. (author)Stumbling during gait is commonly encountered in patients who suffer from mild to serious walking problems, e.g., after stroke, in osteoarthritis, or amputees using a lower leg prosthesis. Instead of self-reporting, an objective assessment of the number of stumbles in daily life would inform clinicians more accurately and enable the evaluation...journal article 2021
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Lăpădat, Alexandru M. (author), Tiberius, C.C.J.M. (author), Teunissen, P.J.G. (author)Smartphone accelerometers and low-cost Global Navigation Satellite System (GNSS) equipment have faced rapid and important advancement, opening a new door to deformation monitoring applications such as landslide, plate tectonics and structural health monitoring (SHM). The precision potential and operational feasibility of the equipment play an...journal article 2021
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Comparison of Thermospheric Winds Measured by GOCE and Ground-Based FPIs at Low and Middle LatitudesJiang, Guoying (author), Xiong, Chao (author), Stolle, Claudia (author), Xu, Jiyao (author), Yuan, Wei (author), Makela, Jonathan J. (author), Harding, Brian J. (author), Kerr, Robert B. (author), March, G. (author), Siemes, C. (author)The re-estimates of thermospheric winds from the Gravity field and steady-state Ocean Circulation Explorer (GOCE) accelerometer measurements were released in April 2019. In this study, we compared the new-released GOCE crosswind (cross-track wind) data with the horizontal winds measured by four Fabry-Perot interferometers (FPIs) located at...journal article 2021