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Development of a companion app for university students to promote mental health during periods of solitary home studying
Get PDFTaking into account the growing prevalence of mental health problems amongst university students and an emerging field of research, artificial companions, this thesis aims at developing a solution to combine these two to build a mental health promoting companion for university students. After having built a solid theoretical foundation for this interdisciplinary thesis, which defines mental health as a positive state of mind that enables people to thrive in life and highlights the relevance of the adaptive and engaging traits of artificial companions,
a comprehensive concept for the design of such a companion is presented. With the intention to build an artificial companion that closely relates to the users, ethical aspects are of central importance and hence, a special emphasis is put on these aspects within the design. Ultimately, a prototype for the designed concept is developed that implements the core elements of the proposed design concept. The prototype is being tested in terms of functionality of the core components. Furthermore, the system is being tested in the intended setting it was designed for: During sessions of solitary studying. The insights gained from both the theoretical
foundations as well as the evaluation process are presented. Last, but not least, directions for future research needed for the improvement and further development of the prototype are outlined
An adaptive metric-based method for privacy-preserving sharing of anonymized urban mobility data
No full textPeerReviewe
The C++ actor framework : a scalable fundament for research and applications
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Towards a more-than-human participatory design approach for urban lighting design practice
No full textEuropäische KommissionAlternativeReviewe
Automatisierung des Produktentwicklungsprozesses nach VDI 2221 für ein mechanisches System durch die Integration von Künstlicher Intelligenz und ChatGPT
Get PDFDiese Masterarbeit befasst sich mit der Frage, wie der Produktentwicklungsprozess nach VDI 2221 durch den gezielten Einsatz von Künstlicher Intelligenz, insbesondere ChatGPT, verbessert werden kann. Ziel ist es, die Effizienz, Konsistenz und Flexibilität der Entwicklung technischer Systeme zu steigern. Am Beispiel einer PKW-Kopfstütze und einer Traktionsbatterie wird ein KI-gestütztes Vorgehen zur automatisierten Erstellung von Anforderungslisten, Konzeptvarianten und Bewertungsmethoden aufgezeigt. Im Mittelpunkt steht die Entlastung von Ingenieuren durch Automatisierung wiederkehrender Aufgaben, ohne dabei auf eine valide fachliche Prüfung zu verzichten. Die Ergebnisse zeigen, dass durch den Einsatz von KI ein strukturierterer und nachvollziehbarer Entwicklungsprozess ermöglicht wird, solange eine kritische menschliche Begleitung
gewährleistet ist.This thesis examines how the product development process according to VDI 2221 can be made more efficient and structured by integrating artificial intelligence, with a focus on ChatGPT. The goal is to automate repetitive tasks and reduce the workload for engineers. Using a car headrest and a traction battery as examples, the study presents methods for AI-assisted generation of requirements, concepts, and evaluation. The results
show that combining AI-based analysis with human review leads to more consistent outcomes and lowers manual effort. This work provides a practical basis for integrating language models into technical development workflows
SORN-based cross-correlation for SCG signal peak detection in resource-constrained systems
No full textPeerReviewe
Quasi-simultaneous detection of ammonia and nitrous oxide by photoacoustic phase-resolved method : a proof-of-concept
Get PDFThis work presents a method for the quasi-simultaneous detection of trace gas molecules using photoacoustic spectroscopy with phase-resolved method. By utilizing two lasers to excite ammonia (NH3) and nitrous oxide (N2O) in a mixture and employing phase-sensitive detection, the individual contributions of these gases were separated. The separation was achieved by adjusting the phase modulation of the N2O exciting laser until a 90-degree phase difference was established between its signal and that of NH3. The results demonstrate the absence of spectral overlap between the two compounds, enabling independent and quasi-simultaneous detection. Calibration curves highlighted the behavior and cross-interference between NH3 and N2O. For NH3, linear profiles with regression coefficients R = 0.998 and R = 0.999 were observed, when N2 or N2 + N2O were used as diluent gases, respectively. The corresponding sensitivities were (3.0 ± 0.1) μV·ppmv–1and (3.10 ± 0.08) μV·ppmv–1. The lower detection limits (LDLs) were 51 ppbv and 67 ppbv, respectively. For N2O, calibration data were similarly robust with LDLs of 262 ppbv and 255 ppbv when diluted with N2 and N2 + NH3, respectively. Minimal cross-interference effects were found, confirming the selectivity and reliability of this method for quantifying NH3 and N2O in gas mixtures. The technique offers advantages over other methods and is applicable to studying emissions related to agriculture with nitrogen fertilizers.PeerReviewe
A correlated multi-observable assessment for vanadium redox flow battery state of charge estimation : long-term stability of methods
No full textAccurate half cell specific state of charge (SOC) monitoring is needed for vanadium redox flow batteries (VRFB) to quantify electrolyte imbalances and to increase operation efficiency by appropriately timed re-balancing. However, electrolyte crossover shifts the vanadium concentrations and can impact the SOC estimation in combination with side reactions in the long run. As a result, the long-term stability of any SOC estimation is crucial for its accuracy, while a rigorous cross-evaluation of SOC monitoring methods for VRFBs is still missing in the literature. In this study, we investigate the long-term stability for SOC monitoring based on half cell electrolyte potentials, electrolyte densities, electrolyte volumes, electrolyte viscosity related pressure drops, pH related potentials and UV/Vis absorbances. We conduct 500 h long-term charge/discharge cycling for a membrane with 100 µm thickness and 300 h for a 50 µm thin membrane. For each cycle, we determine reference SOCs validated by potentiometric titration, which enables us to calculate calibration parameter for each SOC estimation method in each cycle. We analyze the variation and stability of these parameters and assess the long-term accuracy of each method. The highest long-term stability is shown by the UV/Vis absorbance measured at 400 nm in the negative half cell with estimation errors below 2 % and the electrolyte half cell potentials with errors below 2.5 %. The UV/Vis absorbance measured at 580 nm in the positive half cell exhibits a moderate stability with estimation errors lower than 5 %. The electrolyte densities and pressure drops measured in the negative half cell show moderate stabilities with estimation errors below 7.5 % which could allow for accurate SOC estimation with more frequent re-calibrations.Bundesministerium für Wirtschaft und KlimaschutzPeerReviewe
Holding device for a component, system comprising a holding device and method for operating a system
No full textUm eine Haltevorrichtung für eine Komponente bereitzustellen, welche ein präzises Einstellen einer Position der Komponente in der Haltevorrichtung ermöglicht, wird eine Haltevorrichtung (100) vorgeschlagen, umfassend- eine Komponentenhalterung (10) zur Aufnahme der Komponente,- eine Translationsbewegungseinrichtung (12) zur translatorischen Bewegung der Komponente (11) entlang dreier lotrechter Achsen (X, Y, Z), und/oder eine Rotationsbewegungseinrichtung (13) zur rotatorischen Bewegung der Komponente (11) um die drei orthogonalen Achsen (X, Y, Z), wobei die Translationsbewegungseinrichtung (12) und/oder die Rotationsbewegungseinrichtung (13) jeweils eine Positionierungseinrichtung zum Einstellen und Ausgeben einer Position (P1) der Komponente (11) in Bezug auf wenigstens drei der translatorischen bzw. rotatorischen Bewegungsrichtungen entlang der drei orthogonalen Achsen (X, Y, Z) bzw. um die drei orthogonalen Achsen (X, Y, Z) aufweisen.In order to provide a holding device for a component which enables a precise adjustment of a position of the component in the holding device, a holding device (100) is proposed, comprising
- a component holder (10) for holding the component,
- a translational movement device (12) for the translational movement of the component (11) along three vertical axes (X, Y, Z), and/or a rotational movement device (13) for the rotational movement of the component (11) about the three orthogonal axes (X, Y, Z), wherein the translational movement device (12) and/or the rotational movement device (13) each have a positioning device for setting and outputting a position (P1) of the component (11) with respect to at least three of the translational or rotational movement directions along the three orthogonal axes (X, Y, Z) or about the three orthogonal axes (X, Y, Z).NonPeerReviewe
Improvement of geometric product specification through a priori evaluation of uncertainty of CMM measurements
No full textDesigners often define geometric specifications without considering the measurement uncertainty of the inspection processes because this information is not available. A new method - called the VCMM-User method - that allows such an a priori evaluation of the task-specific measurement uncertainty of coordinate measurements is now available. This method, based on Monte Carlo simulations, is described and measurement uncertainties are evaluated for several characteristics of a specific artifact. These uncertainties are verified using an established method. The sensitivity of the method to alternative specifications was demonstrated. Plausibility of the measurement uncertainty values could by verified by comparison with an established method.PeerReviewe