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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
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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
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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
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.
Dissertation
Risk management and sustainability performance in circular supply chains
(2022-09)
This dissertation analyzes supply chain risk management (SCRM) and sustainability performance in the context of circular supply chains (CSCs). The implementation of circular economy (CE) thinking in firms and supply chains has a crucial role in fostering innovative and efficient ways of producing and consuming. However, CE implementation is not a straightforward process, begetting risks and uncertainties that can impact the overall sustainability performance of CSCs. Therefore, managers need to adopt appropriate ...