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Securing software is one of the most important parts in modern software development.
Fuzzing has become one of the most popular methods to automatically test software.
Most fuzzing approaches need the target software to be recompiled which presupposes
source code to be available. When no source code is available, black box fuzzers are
used. In modern software, states play a big role in its functioning. A black box fuzzer
can come to its limits quick when operating on a stateful target with no knowledge.
The use of a state machine in a fuzzer can make the fuzzer more effective.
This thesis introduces a state machine estimation tool for black box systems. An
approach to estimate the state machine with state-of-the-art algorithms over a defined
interface is proposed. Fuzzing will be used to find more inputs and states of the target
to make a more complete state machine. The implemented approach is evaluated on
two stateful targets LightFTP and BFTPD. With a set of pre-known inputs, the
tool was able to correctly estimate the state machines of the targets and the fuzzing
method proved to be successful in finding more states and inputs. Multiple fuzzing
techniques and automata learning algorithms were benchmarked to find the most
successful combination.
This master thesis shows a holistic approach for the optimization of the energy management task for a plug-in hybrid electric vehicle. The ‘Equivalent Consumption Minimization Strategy’ (‘ECMS’) as a local optimal approach is implemented into an embedded controller and applied to a system simulation model in ‘GT-SUITE’, which integrates a hybrid drivetrain and the associated control structure with a thermal management model. Two modifications and one extension to the basic ‘equivalent consumption’ cost function are proposed for the favor of an unambiguous interpretation of the penalty factor term, an enhanced applicability of the ‘ECMS’ close to the battery state of charge limit and an effective applicability of the ‘EMCS’ to the thermal management task. All proposed modifications and extensions prove their applicability in the virtual test environment and recommend themselves for the utilization in further application areas, like the integration of exhaust aftertreatment system, the holistic evaluation of a fuel cell drivetrain or the holistic evaluation of a hybrid ship propulsion system.
Social work across the world has been shaped by prevailing political systems, their influence on the welfare system and hence the social work profession. This thesis examines how the social work profession evolved in South Africa focusing on the political transition from Apartheid to democracy. Particular interests of the research are the development of South African social workers professionalism regarding professional conduct and professional identity. Moreover, it brings out the manifold changes the profession had to undergo in the political transition and consequently the issues the social work profession deals with today.