74 research outputs found
Optimal Stimulus Conditions to Improve User Experience in Brain Computer Interfaces
No full textCurrent Brain Computer Interfaces (BCIs) used for spelling are quite fatiguing
and uncomfortable for the participant to use. It is proposed that
certain stimulus adaptions, such as implementing coloured stimuli, can inhibit
this. This thesis studied the effect of adapting the colour and structure
of checkerboard pattern stimuli on the user’s fatigue and comfort, using a
code-modulated visual evoked potential (c-VEP) based BCI speller interface.
The main focus was on improving this comfort while maintaining a
good system performance. Using five different conditions, it was found that
there is a trade-off between system performance and comfort, and that a
choice needs to be made according to the purpose of the system. It was concluded
that a black-white solid flashing condition was the best performing
stimulus in terms of accuracy of the system, while a violet-grey checkerboard
appeared to be the best condition in terms of user-comfort
Modelling morphodynamic development in the presence of immobile sediment
No full textPredicting the formation and break-up of immobile layers is of crucial importance for river management, as these processes greatly affect the morphodynamic evolution of the river bed. Two models are currently available for studying these processes: Struiksma's and Hirano's model. In this paper, we show that both models present limitations. This is done by numerical modelling of a laboratory experiment and two thought experiments. Struiksma's model does not predict break-up and Hirano's model yields unrealistic results when part of the sediment is immobile. We propose two alternatives that overcome these limitations: the ILSE and HANNEKE models. They differ in the interpretation of the top part of the bed interacting with the flow. Moreover, only the HANNEKE model explicitly predicts the formation of coarse layers, at the expenses of a more limited application range.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Rivers, Ports, Waterways and Dredging Engineerin
Corrigendum to: A Network of Psychopathological, Cognitive, and Motor Symptoms in Schizophrenia Spectrum Disorders
No full textCorrigendum to "A Network of Psychopathological, Cognitive, and Motor Symptoms in Schizophrenia Spectrum Disorders" by Moura et al. Schizophr Bull. 2021; doi: 10.1093/schbul/sbab002. In the originally published version of this manuscript, there were a number of errors in the author list. The author "Hanneke Wigman" should have appeared as "Johanna T. W. Wigman" The author "Genetic Risk and Outcome of Psychosis (GROUP) investigators" have appeared as the fifth author, not the last author. Johanna T.W. Wigman should have had a second affiliation: "Rob Giel Onderzoekscentrum, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands "
De Sint-Elisabethsvloed: Feiten en fictie
No full textRivers, Ports, Waterways and Dredging Engineerin
Erratum: A Network of Psychopathological, Cognitive, and Motor Symptoms in Schizophrenia Spectrum Disorders (Schizophrenia Bulletin DOI: 10.1093/schbul/sbab002)
No full textCorrigendum to "A Network of Psychopathological, Cognitive, and Motor Symptoms in Schizophrenia Spectrum Disorders" by Moura et al. Schizophr Bull. 2021; doi: 10.1093/schbul/sbab002. In the originally published version of this manuscript, there were a number of errors in the author list. The author "Hanneke Wigman" should have appeared as "Johanna T. W. Wigman" The author "Genetic Risk and Outcome of Psychosis (GROUP) investigators" have appeared as the fifth author, not the last author. Johanna T.W. Wigman should have had a second affiliation: "Rob Giel Onderzoekscentrum, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands "
Imagining Occupational Therapy
No full text‘Imagining occupational therapy’ expresses the opinions of four occupational therapists from Canada, Europe, Australia and New Zealand whose combined experience spans 152 years, an average of 38 years. Meeting serendipitously in March 2011, they reflected on the question: Why do we continue to practise and call ourselves occupational therapists when many colleagues have left the profession well before retirement? Igniting conversations were questions and vignettes about their professional lives and their profession. The aim of this opinion piece is to kindle other occupational therapists in imagining a future world for themselves and their profession, just as kindling grass and sticks may fuel a fire.Source type: Electronic(1
A building like a forest: Future proof adaptable timber housing by growing and shrinking
No full textDue to the great housing shortage, many people continue to live in houses that no longer suit them. Looking at future housing demand by taking adaptability as a starting point to create a suitable home for the future generation. Growing and shrinking houses in order to adapt the house to the people instead of the other way around. To do this, a community is needed to realize this new way of living. Sharing facilities, space and knowledge in order to live in a more efficient but also more sustainable way. Building in a wooden grid that offers guidance, but also possibilities because of the large standardization in elements, each unit can be divided in countless different ways. Adjustments can easily be made within 5 years with a demountable system. Where the technical solutions work together with the power of a community to use the 'left over' space as a communal gallery. To use oversized space in any situation. So the extra investment in the beginning is worth it throughout its lifetime. By making a future-proof building where adaptability is guaranteed by demountable elements and the qualities of wood are used to the maximum.Architecture, Urbanism and Building Science
Land and Farmers Equilibrium: Restoring the balance between land and humans in Northern Friesland
No full textThe agricultural landscape in the Netherlands has changed drastically over the course of the last 70 years. After World War II, it was governmental policy that pushed the transition to intensive farming by giving out subsidies. These developments have also had an impact on the province of Friesland, where agriculture has a long history and is thereby embedded in the province’s landscape identity. However, years of scaling up have caused a loss of small-scale structures in the landscape. The result is not only the disappearance of a historic cultural landscape but also the rapid decline of a biodiversity. Fertilisers and pesticides are the two biggest polluters of Dutch surface water, both secondary effects of intensive agriculture. Today, the balance between ecology, the landscape and intensive agricultural practice is lost.This thesis has two main objectives. First a study, to understand the agricultural developments that have taken place since World War II in the Netherlands and specifically Friesland. This study will examine the effects these developments have on ecology, social structures, and the cultural heritage found throughout Friesland. Secondly, a research-by-design assignment aims to find a solution to how a new balance between agriculture, ecology and the landscape can be found through design. Three strategies are developed which are emphasising cultural-historical structures, strengthening ecological values and working with the vernacular. The strategies are implemented on a regional scale in Friesland and on a local scale in dialogue with a local farmer.Through various scales, ecological corridors are strengthened in the area by introducing nature-friendly banks along waterways. These ecological corridors will connect routes on both land and water with cultural-historical structures in the area. In addition, a small-scale farmers’ nature network is implemented. On a local scale, a water-purifying helophyte field will be constructed which filters agricultural water run-off before it discharges into a local waterway. This project can serve as a reference to how we can move towards a newfound balance between ecology, the landscape and agricultural practice in the Netherlands.Architecture, Urbanism and Building Sciences | Landscape Architectur
Reducing waiting times at out-of-hours general practitioner departments: A data-driven simulation modelling and optimization study
No full textThe pressure on healthcare systems is increasing all over the world. With an ageing world population, the costs for healthcare and the shortages in medical staff are continually increasing. In the Netherlands, out-of-hours general practitioner departments, or ‘huisartsenposten’, suffer from this increasing pressure in their telephone triage systems: the departments are crowded and the staff capacity is too low to adequately handle the amount of patients. This often leads to long waiting times on the phone for patients in need of potentially urgent medical care and to high pressure work environments for staff. There is no insight into when and why it is crowded, how high waiting times emerge from this, and how changes can be made in the departments internally and beyond to reduce this problem. In this thesis, research is presented that addresses the practical and scientific lack of knowledge of the factors that influence the out-of-hours departments and that identifies how waiting times can be reduced. The results of this thesis focus on the identification of the factors that influence the demand for healthcare and the service times of people at the out-of-hours departments, and they focus on the practical implications for reducing waiting times at these departments. Based on extensive data analysis of two out-of-hours departments in the Netherlands, it was found that temporal factors such as season, part of the week, day of the week and hour of the day, but also the weather conditions and the urgency of the problem of the patient have an impact on demand for healthcare and on service times at these departments. These factors determine how busy it will be and whether or not waiting times will emerge. With the knowledge of these factors, a discrete event simulation model was implemented to identify what system changes are necessary to reduce waiting times at these out-of-hours departments. It was found that there are several quick-win interventions that can help reduce waiting times: shifting of patients from peak demand, implementation of overlapping work shifts for staff and automatic retrieval of patient information when they are waiting in the queue on the phone. There are also some long term interventions, more focused on behavior change of people, that can be implemented: increased accessibility and understanding of the primary healthcare system, a small (dis)incentive for out-of-hours care, separate telephone lines for home care and implementation of working from home for staff.Engineering and Policy Analysi
Analytical Low-Thrust Trajectory Design: Using the Simplified General Perturbations Model
No full textAn analytical low-thrust design tool for orbits around Earth has been developed which takes perturbations into account. The Simplified General Perturbations 4 model (SGP4) is combined with Edelbaum’s analytical low-thrust trajectory model. This resulted in the SGP4-LT tool which required an iterative version of SGP4. To obtain this iterative SGP4, an existing method was corrected and extended. A convergence rate of 99.5% was obtained for 17542 objects of the satellite catalogue. Convergence was not reached for combinations of inclinations smaller than 0.1° and eccentricities lower than 4e-6. SGP4-LT obtained expected results for orbit raising and non-coplanar orbit change. Altitude maintenance was performed which was based on the GOCE mission. SGP4-LT obtained a 14 % higher amount of propellant than GOCE had available. SGP4-LT provides within seconds a first approximation solution for low-thrust transfer trajectories around Earth and is capable of calculating DeltaV budgets for altitude maintenance in low Earth orbits.Aerospace Engineerin
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