Faculteit der Natuurwetenschappen, Wiskunde & Informatica
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- ItemThe Gravitational Wave Toolbox: modelling electromagnetic counterparts of gravitational wave sources(2021-07-15)In recent years, the field of gravitational wave (GW) physics has become a central part of astrophysics. As a result of this, an increasing number of physicists, both within and outside the GW community will be using GW observations in their research projects. Therefore, especially now, it is of the utmost importance that information about GW sources and their detectability remains easily accessible. The Gravitational Wave Toolbox (https://gw-universe.org) is a tool that aims to take care of this task. It is a user-friendly program, with which one can make quick and efficient computations related to the detectability of GW sources and the properties of GW detectors. As of yet,the Toolbox does not include the possibility so simulate electromagnetic (EM) counterparts (e.g. short gamma-ray bursts, kilonovae) of GW events. As we are currently at the start of a multi-messenger astronomy era, joint GW-EM observations have become a very important aspect of GW physics. As such, inclusion of EM signatures of GW sources in the Toolbox would significantly increase the usability and the applicability of this program. The aim of this study is to add models of EM counterparts to GW sources to the GW Toolbox.We set up models for short gamma-ray bursts (sGRBs) and kilonovae (KNe), as well as EM output of stellar-mass and supermassive black hole binaries. For our sGRB model, we employ an analytical top-hat jet framework, with which we can simulate the sGRB flux and spectrum. We compare this model with observations of GRB170817A,and find that we can recover this well with typical GRB parameters. To predict KN lightcurves, we make use of the existing program gwemlightcurves. In this model,we can use the masses and spins of a binary neutron star (BNS) or black hole - neutron star (BH-NS) to compute the mass and velocity of matter ejecta from the binary.From here, through interpolation with photometric datasets from radiative transfer simulations, we can compute the KN lightcurve in different passbands. We compare this model with observations of AT2017gfo, and conclude that its performance is good enough, even though it slightly underestimates the KN brightness. Additionally, we include and show the results of several order-of-magnitude luminosity estimates for the EM output of stellar-mass and supermassive black hole binaries. Subsequently, we illustrate the synergies and trade-offs between GW detectors and M instruments by using the Toolbox to simulate a universe filled with GW sources, and computing the peak GRB flux for each of them. Lastly, we include a clear visualisation of how these models will be implemented into the framework of the GW Toolbox.
- ItemUnderstanding e-health adoption costs in a Dutch nursing and homecare organization: a case study investigating adoption of a Smart Glass in wound care(2021-08-13)Different forms of e-health are currently in development that could be a solution for keeping the Dutch healthcare system sustainable. Main problem is that many healthcare organizations fail in successful e-health adoption. This study aims to understand factors influencing successful adoption of a Smart Glass in a Dutch nursing and homecare organization together with identifying and estimating (hidden) cost drivers involved in this adoption process. A conceptual model is proposed combining the extended Unified Theory of Acceptance and Use of Technology (UTAUT2), Technological-Organizational-Environmental (TOE) and Knowledge Management (KM) framework. Cost drivers were identified by using Time Driven Activity Based Costing (TDABC). Data was collected using semi-structured interviews (n=10) and analysed using a thematic content analysis showing that there is a complex interplay between individual- and organizational factors that influences successful e-health adoption. Main cost drivers in this project were personnel costs (43%) of which 19% were hidden costs: unidentified project costs. Of the time that should have been spent on care, 3,4% was spent on adoption of the Smart Glass resulting in reduced productivity and increased workloads of healthcare workers. Overall, successful adoption of e-health is a complex and dynamic process between individual and organizational factors that involves mainly time investments of personnel. Mapping how e-health adoption affects productivity and workloads is required for e-health adoption to succeed. Furthermore, this study suggests the implementation of new technologies one by one or when e-health is implemented in parallel to schedule dedicated time per employee for the adoption process.
- ItemThe Influence of Technical and Behavioral Characteristics on Response Procedures for Cyber Security Incidents(2021-06-14)Cyber security issues are topical and threaten ICT progress. In December 2019, Maastricht University was startled by a serious cyber crime on their Windows systems and backup services. Such incidents can be prevented in the future by means of a targeted analysis of the attack. However, scientists agree that security incidents will continue to occur, highlighting the importance of incident response. The response to cyber security incidents must be structurally addressed in extensive processes and procedures with a significant impact on security. This thesis lays the foundation for meeting these conditions as an organization. Two scientific literature studies on technical and behavioral characteristics of cyber security incident response procedures, composed with an analytical projection of this theory on the incident at Maastricht University, form the basis of my thesis.
- ItemMaking and Analysing Simulated Images of Globular Clusters for MICADO @ ELT(2019-07-31)The Extremely Large Telescope (ELT) is in the process of being built at this moment, and is scheduled for first light in 2025. Mock images are simulated with the Python package SimCADO, which mimics the telescope and it’s instrument MICADO. The imaged objects are globular clusters of varying mass, size and distance. The images are analysed to quantify the expected performance of the telescope in this use case. The position measurements show good agreement with the model clusters. The magnitude accuracy is a strong function of both magnitude and radius: not unexpected in the crowded stellar fields of these clusters.
- ItemDe Radboud Universiteit over 10 jaar(2018-11-30)Een kwalitatief onderzoek naar de visies en toekomstbeelden die leven binnen de Radboud Universiteit. Met behulp van interviews en een literatuuronderzoek zijn belangrijke aandachtspunten voor de toekomst van de organisatie geïdentificeerd. In een workshop is hiermee een breedgedragen toekomstbeeld voor de universiteit ontwikkeld.