Privatpersoner och företag hyr i allt större utsträckning molntjänster snarare än att själva driva ett datacenter. Kunder som använder molntjänster förväntar sig att dessa alltid är tillgängliga och säkra i ett datacenters händer. För att möta kunders förväntningar designas dagens datacenter med hög tillgänglighet, skalbarhet och säkerhet. Dagens datacenter designas utifrån hierarkiska trädtopologier med redundanta enheter och protokoll, vilket möjliggör både hög tillgänglighet och skalbarhet. Säkerheten uppnås via flera delar såsom brandväggar, spam- och DoS-skydd samt med ständigt uppdaterade enheter. Företaget TwigNET var i behov av en förnyad brandväggslösning och omstrukturering av sitt datacenter. Med målsättningen att ta fram den bästa brandväggslösningen för företaget så analyserades den befintliga brandväggslösningen i kombination med hur trafiken flödar till och från datacentret.Analysen användes som grund för att ta fram en ny lösning som designades för att kunna användas samtidigt som företagets befintliga lösning. I den gamla lösningen så delade alla servrar på en broadcast-domän. Den nya brandväggslösningen designades till att dela in varje server-kategori i en egen broadcast-domän, subnätverk och zon. Företagets redan etablerade policy för internetkommunikation återanvändes på de nya zonerna, men anpassades även för filtrering mellan dessa. Teknikerna chassis cluster, LACP och vPC användes för att uppnå hög tillgänglighet för brandväggarna utan att behöva använda active/active. När den nya brandväggslösningen var färdigställd så jämfördes Juniper SRX mot Cisco ASA för att belysa likheter och skillnader.

Objective video quality assessment is of great importance in video compression and other video processing applications. In today's encoders Peak Signal to Noise Ratio or Sum of Absolute Differences are often used, though these metrics have limited correlation to perceived quality. In this paper other block-based quality measures are evaluated with superior performance on compression distortion when evaluating correlation with Mean Opinion Scores. The major results are that Block-based Visual Information Fidelity with optical flow and intra-frame Gaussian weighting outperforms PSRN, VIF, and SSIM. Also, a block-based weighted Mean Squared Error method is proposed that performs better than PSRN and SSIM, however not VIF and BB-VIF, with the advantage of high locality, which is useful in video encoding. The previously mentioned weighting methods have not been evaluated with SSIM, which is proposed for further studies.

The growing mail volumes for businesses worldwide is one reason why theyare increasingly turning to digital mailrooms. A digital mailroom automaticallymanages the incoming mails, and a vital technology to its success isdocument classication. A problem with digital mailrooms and the documentclassication is separating the input stream of pages into documents.This thesis investigates existing classication theory and applies it to createan algorithm which solves the document separation problem. This algorithmis evaluated and compared against an existing algorithmic solution, over adataset containing real invoices.

File carving är konsten att återskapa raderade filer utan hjälp av filsystemsinformation. Speciellt viktigt skulle detta kunna vara vid utredning av ekonomisk brottslighet som utgör en vital del inom bekämpning av prioriterade områden som organiserad brottslighet och terrorism. I detta arbete presenteras ett nytt verktyg för att utföra file carving som även jämförs mot andra verktyg på marknaden med tyngdpunkt på processtid och minnesanvändning. Dessutom riktas fokus på egenskapen att snabbt kunna söka efter nyckelord i de framtagna filerna. Detta är något som kan vara mycket användbart när det finns behov av att snabbt hitta relevant information i en brottsutredning. Då filformaten .docx samt .pdf hör till de vanligaste typerna av textfiler har testerna valts att göras på dessa. I arbetet har det även undersökts hur polisen arbetar med file carving och sökning i textdokument idag. EnCase är det absolut mest använda programmet hos polisen, men testerna visade att det är både långsamt och resurskrävande. Verktyget Autopsy visade sig vara ett snabbare alternativ, men det nykomna verktyget Alice var mindre, snabbare och resurssnålare än båda alternativ. EnCase kunde inte heller visa resultaten av en textsökning på ett lika överskådligt sätt som Autopsy och Alice.

This thesis contains results on convergence studies for different stencils of radial basis function generated finite difference (RBF-FD) method applied to solving Black-Scholes equation for pricing European call options. The results experimentally confirm the theoretical convergence rates for smooth payoff functions with stencils of size 3, 5 and 7 in one- dimensional problems, and 9, 13 and 25 in two- dimensional problems. Moreover, it is shown how different terms in the equation can be approximated individually using the proposed method and then combined into a discrete approximation of the entire spatial differential operator. This new version of the RBF-FD method, where each term has been approximated individually, has been compared to the classical method and the outcome did not show any significant performance advantages. Nevertheless, the results also showed that the second order derivative was the hardest one to approximate accurately and this poses an important finding for the future development of the method.

To test software over a remote desktop is an increasingly common practice since outsourcing and offshoring of testing activities are on the rise. Most companies useproprietary testing tools which require an agent to be installed on the remote machine.This installation opens several attack surfaces and has thus the potential to compromise security. In addition license, support and other proprietary test tool costs might reduce the return on investment of automated tests to an unprofitable level, especially for relatively short projects.Robot Framework with Sikuli integration (RFSI) is a concept based on two open source tools which offer solutions concerning the security and cost issues. RFSI based tests do not need any further installations, access rights or network configurations on the remote machine, because of the fact that the tests are based on visual input. Therefore tests with RFSI cannot access the AUT (Application Under Test) or the remote machine in any other way than a manual tester could. Open-source tools, being freely available, also escape the problem of licence costs. The purpose of the proof of concept pilot study wasto give an answer on the question if RFSI can furthermore be considered an alternative to proprietary tools in terms of requirements for tool quality characteristics and for the external context of test automation projects.The methodology of this research followed the broader Goal-Question-Metrics method(GQM) described by Rini van Solingen and Egon Berghout, based on the GQM approachby Victor Basili and David Weiss. The requirements and metrics for the evaluation of RFSI in the study were selected through a literature study of ISO/IEC-TR9126-3 and other articles in the field. They comprehend six categories: functionality, reliability,maintainability and stability, efficiency, understandability and portability. For each category,metrics were established and adapted to the context of the proof of concept. The scope of the project was given by six use cases and test specifications, established in cooperation with system experts at the company CGI Sundsvall. These were then translated into RFSI test scripts and implemented with the requirements for successful remote GUI testing in mind.The results of the measurements for the proof of concept study showed that RFSI fulfilles the internal and external requirements for successful automated testing completely for functionality, understandability and portability. The requirements are partially satisfiedfor reliability, maintainability and stability, and efficiency.In conclusion, RFSI satisfies enough requirements to be considered a viable alternative to commercial testing tools for tests of GUI (Graphical User Interface) desktop applications over a remote desktop.

The thesis delves into the area of troubleshooting procedures, an interesting areafor industry. Many products in industry tend to be complex, which in turn makestroubleshooting procedures trickier. A fast and efficient repair process is oftendesired, since customers want the product to be repaired as fast as possible. The purpose of a troubleshooting procedure is to find a fault in a broken product,and to choose proper repair actions in a workshop. Such a procedure can besimplified by diagnosis tools, for example software programs that make faultconclusions based on fault codes. These tools can make such conclusions withthe help of algorithms, i.e. fault tracing algorithms. Before a product release, it is hard to specify all faults and connections in the system.New unknown fault cases are likely to arise after release, and somehow thisneed to be taken into account in the troubleshooting scenario. The troubleshootingprocedure can be made more robust, if new data could be easily incorporatedin the current structure. This work seek to answer how new data can be incorporatedin trouble shooting procedures. A good and reliable fault tracing algorithm is essential in the process of findingfaults and repair actions, which is the reason behind the focus of this thesis. Thepresented problem asks how a fault can be identified from fault codes and symptoms,in order to recommend suitable repair actions. Therefore, the problem isdivided into two parts, finding the fault and recommending repair actions. Inthe first part, three candidate algorithms for finding the faults are investigated,namely Bayesian networks, neural networks, and a method called matrix correlationinspired from latent semantic indexing. The investigation is done by trainingeach algorithm with data, and evaluating the results. The second part consists ofone method proposal for repair action recommendations and one example. Thetheoretical investigation is based on the Servo unit steering (SUS), which residein the IPS system of Volvo Penta. The primary contribution of the thesis is the evaluation of three different algorithmsand a proposal of one strategy to recommend suitable repair actions.In this study Bayesian networks are found to conform well with the desired attributes,which in turn lead to the conclusion that Bayesian networks is well suited for this problem.

Examensarbetet gick ut på att projektera en lösning där biblioteksanvändare vid Umeå kommuns stadsbibliotek ska kunna logga in på det trådlösa nätverket med hjälp av deras lånekort och ett lösenord eller PIN-kod. Lösningen ska även ta hänsyn till gäster som saknar bibliotekskort och erbjuda dem en tillfällig inloggning. Den projekterade lösningen gick ut på att använda befintlig hårdvara vid Umeå kommun samt outnyttjade funktioner i de befintliga servrarna. Den framtagna lösningen har även testats och skulle inom en snar framtid kunna implementeras. / The goal of this project is to present a solution for the wireless network at the city library in Umeå. The new system will allow users to log on to the wireless network using their library card along with a password of some kind. There must also be a way for guests without library cards to be allowed access to the network in some way. The result of this project was based on hardware that Umeå already had access to, and certain functions in that hardware that hasn’t been explored earlier and offered a lot of potential. This solution was tested to some extent and could be implemented in a near future.

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When treating cancer patients using radiotherapy, careful planning is essential to ensure that the tumour region is treated while surrounding healthy tissue is not injured in the process. The radiation dose in the tumour along with the dose limitations to healthy tissue can be expressed as a constrained optimization problem. The goal of this project has been to create prototype environments in C++ for both testing and parameter tuning of optimization algorithms intended to solve radiotherapy problems. A library of test problems has been implemented on which the optimization algorithms can be tested. For the sake of simplicity, the problem solving and parameter tuning has only been carried out with the interior point solver IPOPT. The results of a parameter tuning process are displayed in tables where the effect of the tuning can be analysed. By using the implemented parameter tuning process, some settings have been found that are better than the default values when solving the implemented test problems.