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Dissertation
The Implications of Feedback Frequency for Employee Creativity
(2022)
Managers are still floundering when they have to decide on the optimal level of feedback frequency; either when they consider themselves as a source of feedback, but also when they shape the feedback environment of their employees, e.g., by allowing more (or less) frequent customer feedback. Furthermore, given that feedback is a time-consuming task, managers might be reluctant to provide feedback frequently, foregoing a potentially powerful lever for increasing employee creativity. Ultimately, clarifying the ambiguities ...
Dissertation
Movement Recognition and Direction Detection of Pedestrians
(2021)
In this dissertation we developed a method that uses smartphone sensors to recognise the pedestrian movement (using the accelerometer) and direction (using the compass) accurately. The proposed approach works independent of the GPS and also improved the recognition time of pedestrians movement and direction in comparison to using the GPS.Currently, smartphones are the most common devices people carry with them along with the tablets and smartwatches. Most smartphones are equipped with different types of sensors, ...
Dissertation
Optimal control of a rate-independent system constrained to parameterized balanced viscosity solutions
(2022)
In this dissertation, we analyze an optimal control problem governed by a rate-independent system in an abstract infinite-dimensional setting. The rate-independent system is characterized by a nonconvex stored energy functional, which depends on time via a time-dependent external loading, and by a convex dissipation potential, which is assumed to be bounded and positively homogeneous of degree one.
The optimal control problem uses the external load as control variable and is constrained to normalized ...
Dissertation
Consistent Hierarchical Control in Cooperative Autonomous Driving
(2022)
This thesis is set within the context of the problem of motion planning in autonomous driving. Due to nonlinear system dynamics and non-convex constraints, this problem is challenging even under simplifying assumptions (e.g. non-cooperating traffic participants obey traffic rules, lossless inter-vehicle communication, absence of measuring errors). Typical solution approaches rely on a decomposition of the problem into subproblems which are easier to solve. This decomposition often results in a hierarchy of subproblems ...
Dissertation
Development of a Preconditioning Scheme for Real Gases using Asymptotic Expansions
(2022)
Bei der Beschreibung von Strömungen wird klassischerweise zwischen inkompressiblen und kompressiblen Bereichen unterschieden. Während inkompressible Strömungen durch ein divergenzfreies Geschwindigkeitsfeld charakterisiert werden, sind kompressible Strömungsfelder durch Expansionsfächer, Kontaktunstetigkeiten und Stoßwellen gekennzeichnet. Die beiden Bereiche werden damit durch stark unterschiedliche Systeme partieller Differentialgleichungen beschrieben. Diese Unterscheidung zeigt sich auch in der numerischen ...
Dissertation
Tischbein und die Kunst des ‚Goldenen Zeitalters'
(arthistoricum.net, 2020)
Die Kunst des ‚Goldenen Zeitalters‘ der Niederlande steht häufig im Fokus der Kunstgeschichte, doch nur selten hinsichtlich ihrer Rezeptionsgeschichte in Deutschland in der Zeit um 1800. Die Studie schließt diese Lücke am Beispiel der Niederlande-Reise von Johann Heinrich Wilhelm Tischbein und gewinnt dabei einen neuen Blick auf Aspekte wie Bildwissen, Verbreitung und Rezeption der niederländischen Kunst des 17. Jahrhunderts. Beziehungen und Austausch zwischen Künstlern und Kennern, Agenten und Sammlern werden ebenso ...
Dissertation
Investigation of potential drying strategies for quality maintenance of carrot
(2021-05-27)
Convective drying of carrots is a non-linear and unsteady-state process with simultaneous mechanism of heat and mass transfer leading to time varying quality changes along the process and finally causing irreversible quality modification. Inappropriate drying condition will generate many qualities related problems such as destruction of physical properties and discoloration of carrots causing by mechanical and thermal damage due to over-drying or extended drying periods. Inconsistent quality of the product was also ...
Dissertation
The Representation of Motion Events
(2022)
The thesis at hand approaches the conceptualization of motion events from a theoretical point of view as well as on the basis of a corpus study and two experimental designs. The research focuses on the investigation of different factors determining the conceptualization and verbalization of motion events by examining both cognitive variables and grammatical factors.