<p>Abstract: This thesis begins with briefly describing a few vulnerability classes that exist in today’s software. We then continue by describing how these vulnerabilities could be discovered through dynamic testing. Both general testing techniques and existent tools are mentioned.</p><p>The second half of this thesis present and evaluates a new flexible architecture. This new architecture has the ability to combine different approaches and create a more flexible environment from where the testing can be conducted. This new flexible architecture aims towards reducing maintenance and/or adaptation time for existing tools or frameworks. The architecture consists of a given set of plug-ins that can be easily replaced to adapt test as needed. We evaluate this architecture by implementing test plug-ins. We also use this architecture and a set of test plug-ins to generate a fuzzer targeted to test a known vulnerable server.</p>

Abstract: This thesis begins with briefly describing a few vulnerability classes that exist in today’s software. We then continue by describing how these vulnerabilities could be discovered through dynamic testing. Both general testing techniques and existent tools are mentioned. The second half of this thesis present and evaluates a new flexible architecture. This new architecture has the ability to combine different approaches and create a more flexible environment from where the testing can be conducted. This new flexible architecture aims towards reducing maintenance and/or adaptation time for existing tools or frameworks. The architecture consists of a given set of plug-ins that can be easily replaced to adapt test as needed. We evaluate this architecture by implementing test plug-ins. We also use this architecture and a set of test plug-ins to generate a fuzzer targeted to test a known vulnerable server.

A vector form intrinsic finite element method ( plane frame element ) is developed and applied to study the dynamic responses of offshore template platform under wave force. The horziontal, vertical and rotational motions at each node in the finite element model also were analyzed by the developed solution procedure of offshore structures. Besides, this paper also discussed the application of viscoelastic dampers on the offshore structures. A design for the dampers incorporated in the template structure were presented, and dynamic analyses were carried out to observe the effect of the vibration mitigation on the structures .

The topic of structural dynamics involves an ample actuation field since the most of nature actions are time dependent. The analyses of structures in aerospace engineering, offshore engineering, civil engineering and others might be realized including the inertial effects since they have important role in reliability and safety of them. Due to the various nonlinearities that can be present in the dynamic analysis, the preview of the dynamic behavior of a structure can become a complex task. That analysis is generally executed using computational numeric algorithms improved for spatial and temporal discretization where computational requirements are excessive. Techniques based on element-by-element concept have gained recognition due to its increasing efficiency caused by the recent development of parallel computers. This work is focused on time integration algorithms for nonlinear dynamic problems formulated by the finite element approach. Besides, the considered algorithms have been prepared to be used, in the future, on parallel computational architectures. The main algorithms for nonlinear structural dynamics and alternatives of implementation of the element-by-element techniques are studied. The software MATLAB has been used for implementation of some algorithms, whose features are analyzed by examples. Some characteristics as computational cost, number of iterations and solutions quality are observed for nonlinear quasistatic and dynamic problems, adopting several spatial and temporal discretization levels. / A dinâmica de estruturas compreende uma vasta área de atuação visto que as ações da natureza são geralmente variáveis com o tempo. Análises de aeronaves, estruturas offshore, estruturas sujeitas a terremotos, entre outras, devem ser realizadas considerando também os efeitos inerciais, que têm papel importante na performance e segurança dessas estruturas. A análise do comportamento dinâmico dessas estruturas é bastante complexa em virtude das diversas não linearidades que podem estar presentes. Atualmente, essas análises são realizadas utilizando-se algoritmos numéricos computacionais para discretização espacial e temporal, exigindo, em geral, grandes esforços computacionais. Com o advento dos clusters de computadores na década de 90, o emprego de algoritmos numéricos paralelos utilizando a técnica elemento por elemento tem se difundido e se mostrado eficiente na solução desses problemas. Nesse contexto, este trabalho está direcionado ao estudo de algoritmos de integração no tempo para problemas de dinâmica não linear de estruturas pelo método dos elementos finitos, que possibilitem seu uso futuro em arquiteturas computacionais paralelas. Os principais algoritmos para dinâmica não linear de estruturas são revisados, assim como as alternativas de implementação através da utilização da técnica elemento por elemento. Em seguida, utilizando-se o programa computacional MATLAB, implementam-se alguns desses algoritmos e avaliam-se suas características através de exemplos ilustrativos. Observam-se, nesses exemplos, características como custo computacional, número de iterações e qualidade das respostas geradas para problemas quase estáticos e dinâmicos não lineares considerando-se diversos níveis de discretização espacial e temporal.

The thesis deals with a design of the river Labe bridging in the city Hradec Kralove. In order to make option for cyclists and pedistrians to cross between shores. There were made three design variants. For detailed solution curved twin-arm arched structure was chosen. The aim of the thesis was design and assessment of Bering strucutre of the footbridge according ultimate limit states and serviceability limit state given by valid Eurocodes.