Several algorithms have been proposed to implement intrusion detection systems (IDS) based on the idea that anomalies in the behavior of a system might be produced by a set of actions of an intruder or by a system fault. Almost no previous research has been conducted in the area of anomaly detection for high performance clusters. The research reported in this thesis demonstrates that the analysis of sequences of function calls issued by one or more processes can be used to verify the correct execution of parallel programs written in C/C++ with the Message Passing Interface (MPI) in a cluster of Linux workstations. The functions calls were collected via library interposition. Two anomaly detection algorithms previously reported to be effective methods for anomaly detection in sequences of system calls, Hidden Markov Model and sequence matching, were implemented and tested. In general, the simpler sequence matching algorithm out-performed the Hidden Markov Model.

A silvicultura brasileira tem mais de 100 anos de desenvolvimento, o melhoramento genético do Eucalyptus tem mais de 60 anos no Brasil. Todos esse conhecimento é o que torna o Brasil um dos países mais competitivos na produção florestal. Porém essa competitividade cem caindo, principalmente ligado ao alto custo de produção que no ano de 2017 foi maior do que a inflação. Inovações no processo produtivo do Eucalyptus são necessárias para que se mantenha a competitividade. A maioria dos plantios na atualidade são clonais, garantindo um potencial de crescimento geneticamente igual, porém isso não garante a uniformidade de desenvolvimento, pois a silvicultura tem um papel importante na disponibilização dos recursos para um desenvolvimento uniforme das plantas. O índice de uniformidade demonstra a similaridade do desenvolvimento dos indivíduos no plantio. Esse índice, em plantios clonais, principalmente, é afetado pela qualidade operacional da silvicultura. A uniformidade de plantio já foi demonstrada como indicador de qualidade da silvicultura, sendo possível realizar avaliações comerciais por meio dela. Porém, não é estabelecido um método que de um conceito de quando a variação do índice de uniformidade é um sinal de mudanças de comportamento da qualidade da silvicultura. O presente trabalho teve como objetivo aplicar e validar um método de avaliação da qualidade operacional da silvicultura que auxilie e facilite em decisões estratégicas. Para tanto, foi empregado como indicador o índice de uniformidade e a ocorrência de mudanças verificadas por meio do gráfico de comportamento de processo. Foram avaliadas duas regiões e 4 métodos de reforma. Conclui-se que o método de avaliação é válido e consegue captar os efeitos das mudanças relacionadas aos 6 M\'s Diagrama de causa e efeito e que mesmo a empresa tendo realizado mudanças que geraram melhora no índice de uniformidade, ainda é necessário buscar mais adequações para o atingimento da voz do cliente. / The Brazilian silviculture has more than 100 years of development, the Eucalyptus genetic improvement of has more than 60 years in Brazil. All this knowledge is what makes Brazil one of the most competitive countries in forest production. However, this competitiveness fell, mainly linked to the high cost of production, that in 2017 was higher than inflation. Innovations in the Eucalyptus productive process are necessary to maintain competitiveness. Most plantations today are clonal, ensuring a genetically equal growth potential, but this does not guarantee uniformity of development, since forestry plays an important role in making resources available for uniform plant development. The uniformity index demonstrates the similarity of individuals\' development in planting. This index, in clonal plantations, is mainly affected by the operational quality of forestry. The uniformity of planting has already been demonstrated as an indicator of the forestry quality, and commercial evaluations can be made through it. However, a method is not established that from a concept of when the variation of the uniformity index is a sign of behavioral changes in the forestry quality. The present work had as objective to apply and to validate a method of evaluation of the operational quality of forestry that helps and facilitates in strategic decisions. For that, the index of uniformity and the occurrence of changes verified through the process behavior chart were used as indicators. Two regions and four reform methods were evaluated. It is concluded that the evaluation method is valid and is able to capture the effects of the changes related to the 6 M\'s Cause and Effect Diagram and that even the company having made changes that generated an improvement in the uniformity index, it is still necessary to seek further adjustments for the the voice of the customer.

Das ultraschallunterstützte Rührreibschweißen (USE-FSW) als innovatives Hybrid-Pressschweißverfahren zeichnet sich durch eine Reihe von Vorteilen aus, welche es für die Kombination artfremder metallischer Werkstoffe mit deutlich unterschiedlichem Schmelzpunkt ermöglichen, qualitativ hochwertigere Verbunde zu realisieren. Die vorliegende Arbeit thematisiert experimentelle Untersuchungen der Auswirkungen des zusätzlich eingekoppelten Leistungsultraschalls auf das Prozessverhalten und die Bindungsmechanismen sowie daraus resultierender mechanischer Verbundeigenschaften beim ultraschallunterstützten Rührreibschweißen von Aluminium/Stahl-Verbunden. Im Anschluss an die Ermittlung geeigneter Parameter für das konventionelle Rührreibschweißen erfolgen grundlegende Betrachtungen des Einflusses des Leistungsultraschalls auf das Schwingungsverhalten, das thermische Verhalten und das insitu- Prozesskraftverhalten, aus denen bestmögliche Ultraschallparameter abgeleitet werden. Nachfolgende detaillierte, vergleichende Untersuchungen des konventionellen und des ultraschallunterstützten Rührreibschweißprozesses belegen unter anderem eine Reduktion der Dicke spröder, aluminiumreicher intermetallischer Phasen am Verbund-Interface des USE-FSW-Verbundes, was in einer Erhöhung der Zugfestigkeit und der Duktilität resultiert. / The ultrasound enhanced friction stir welding (USE-FSW) as an innovative hybrid solid state joining process is characterized by a number of advantages that enable the realization of higher quality joints for the combination of dissimilar, metallic material combinations with strongly differing melting points. The present work addresses the impact of the additional power ultra- sound transmission on the process behavior and the bonding mechanisms as well as resulting mechanical joint properties for the ultrasound enhanced friction stir welding of aluminum/steel joints via experimental investigations. Subsequent to the determination of suitable parameters for the conventional friction stir welding basic considerations of the power ultrasound influence on the oscillation behavior, the thermal behavior and the in-situ process force behavior take place for deriving a best possible set of ultrasound parameters. Moreover, the conventional and the ultrasound enhanced friction stir welding process are investigated comparatively in detail, proving a reduction in thickness for brittle, aluminum-rich intermetallic phases at the USE-FSW joint interface among other things, resulting in an improved tensile strength and ductility.