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The need to visualise sets of data and networks within a company is awell-known task. In this thesis, research has been done of techniques used to visualize complex networks in order to find out if there is a generalized optimal technique that can visualize complex networks. For this purpose an application was implemented containing three different views, which were selected from the research done on the subject. As it turns out, it points toward that there is no generalized optimal technique that can be used to default visualize complex networksin a satisfactory way. A definit conclusion could not be given due to the fact that all visualization techniques which could not be evaluated within this thesis timeframe. / Behov av att visualisera data inom bolag är ett känt faktum. Denna avhandling har använt olika tekniker för att undersöka om det existerar en generell optimal teknik som kan tillämpas vid visualisering av komplexa nätverk. Vid genomförandet implementerades en applikation med tre olika vyer som valdes ut baserat på forskning inom det valda området. Resultatet visade att det inte existerar en generell optimalteknik som kan tillämpas vid visualisering av komplexa nätverk, det medför att en definitiv slutsats inte kan dras. Det på grund av att alla de visualiseringstekniker som existerar inte kunde undersökas inom examensarbetets tidsram.

<p>Within legal positivism, the theory which holds that there is no necessary connection between legal validity and morality, there is dissensus about whether there can be a contingent connection. Inclusive legal positivists suggest that it is possible for morality to play a role in determining a norm’s legal validity while exclusive legal positivists argue for the opposite. This dissertation examines this debate between inclusive legal positivism and exclusive legal positivism focusing on how paying attention to all of the fundamental secondary rules in a legal system can affect arguments about the coherence of either theory. The fundamental secondary rules being the rules which identify other rules, identify authority and authorize changes. I will be demonstrating that three exclusive legal positivist arguments against inclusive legal positivism are unconvincing because of the role that fundamental secondary rules play in our legal systems. Shapiro and Raz offer arguments against inclusive legal positivism based on different important features that they believe the law possesses. However, given their commitment to a particular type of fundamental secondary rule, specifically a directed power, exclusive legal positivism is unable to better capture these important features. Himma suggests that inclusive legal positivism cannot explain how a court can have final authority to determine constitutional cases involving moral criteria. Again, however, we examine what fundamental rules an inclusive legal positivist could employ to explain the phenomenon, we find that exclusive legal positivism is in no better position. At the end of the dissertation, I will suggest why I think continuing with these types of arguments will continue to be fruitless and briefly examine how similar inclusive and exclusive legal positivism are through investigating how one might determine whether a given legal system had an inclusive rule of recognition or exclusive one.</p> / Doctor of Philosophy (PhD)

No / This paper studies the selective maintenance problem for multi-state systems with structural dependence. Each component can be in one of multiple working levels and several maintenance actions are possible to a component in a maintenance break. The components structurally form multiple hierarchical levels and dependence groups. A directed graph is used to represent the precedence relations of components in the system. A selective maintenance optimization model is developed to maximize the system reliability in the next mission under time and cost constraints. A backward search algorithm is used to determine the assembly sequence for a selective maintenance scenario. The maintenance model helps maintenance managers in determining the best combination of maintenance activities to maximize the probability of successfully completing the next mission. Examples showing the use of the proposed method are presented.