Idag går utvecklingen mot alltmer distribuerade IT-system där en grupp datorer kommunicerar med varandra. Detta gäller för sökmotorer, beräkningsintensiva miljöer och även för den svenska försvarsmaktens ledningssystem.För att systemen ska kunna kommunicera så flexibelt som möjligt vill man ofta att kommunikationen ska ske enligt standardiserade protokoll vilka är oberoende av datorplattform, programmeringsspråk och transportprotokoll. Ett koncept som kan användas för denna sorts kommunikation är Web Services vilket är ett koncept där meddelanden skickas XML-formaterade över valfritt kommunikationsprotokoll.För att möjliggöra utbyte av känsligt data som inte får nås av obehöriga måste kommunikationen stöttas av ett flertal viktiga säkerhetsfunktioner. En av dessa funktioner är användarautentisering vilket innebär att användarens identitet kan verifieras.För att möjliggöra användarautentisering kan digitala certifikat och asymmetriska kryptooperationer användas, denna typ av operationer är prestandakrävande varför ?Single Sign On? eftersträvas.

The aim of the "Green forest management plans" is to help forest owners to reach the environmental goal of the forestry act. But are they able to do that? Is it possible to plan preservation of species on single estates? How do single-estate-plans differ from a landscape analysis and how can the landscape approach be used in operative planning? This work was initiated to give an answer to these questions. This study was made in a landscape of 4200 ha in Östergötland county, south-eastern Sweden. A lanscape analysis was made and then compared to the Green forest management plans in the same area. The nature conservation areas (areas that were set aside to be managed with environmenatl goals) differed quite a lot between the two alternatives.

In modern military operations the requirements of transmitting large amounts of information have increased substantially during the last decade. This increases the demand for high-capacity radio networks. It is also very important that military decisions are made on recent and correct information and this implies that low and known delays are required. The existing military radio ommunications, within the Swedish army, do not meet the requirements for capacity and delay. We have investigated how the capacity and average delay can be improved in an Ad Hoc network with STDMA by using antenna arrays.

The use of Power Line Communication, PLC, as a communication solution for Automated Meter Reading, AMR, is popular by utilities in Sweden and other parts of the world due to demands of accurate and fast meter reading. However the use of the electrical grid as a communication medium is complex and sometimes problematic. This report handles some of the issues and problems that are important to understand when using the grid as a communications medium. Focus is mainly on investigating high frequency distortion in the Kristianstad power grid own by C4energi caused by a frequency converter. Measurements on site are done to investigate signal damping in the grid, different configurations for the frequency converter and signal strength of the PLC-system.

The use of Power Line Communication, PLC, as a communication solution for Automated Meter Reading, AMR, is popular by utilities in Sweden and other parts of the world due to demands of accurate and fast meter reading. However the use of the electrical grid as a communication medium is complex and sometimes problematic. This report handles some of the issues and problems that are important to understand when using the grid as a communications medium. Focus is mainly on investigating high frequency distortion in the Kristianstad power grid own by C4energi caused by a frequency converter. Measurements on site are done to investigate signal damping in the grid, different configurations for the frequency converter and signal strength of the PLC-system.

This thesis includes a review of scientific studies of tree injuries following mechanized thinning. Interviews have been made with drivers of single grip harvesters and forwarders in forest thinning and a number of essential factors have been identified as the most important to take into account in order to minimize and/orprevent injuries to stems and roots of remaining trees..

In 1993 the internal market within the European Union was formed and ensured free movement of goods, services, capital and people. This led to the removal of trade barriers between members of the European Union. When opening up for competition, price differences between countries decreased and more jobs were created. A single currency was introduced by eleven countries in 1999 with the goal of reducing transaction costs, eliminating exchange rate risk and to further simplify trade. In 2001 Greece joined the collaboration and introduced the euro.

Detta examensarbete är genomförd som en explorativ fallstudie på ärendehanteringssystem för att se vilken påverkan dessa system har på företagen som använder dem. Tidigare forskning har visat många fördelar från enskilda funktioner inom ärendehantering och ärendehanteringssystem, men det finns en avsaknad av undersökningar som tittar på dessa system som helhet. Examensarbetet genomfördes som en så kallad single case fallstudie på ärendehanteringssystemet SupportPoint som är utvecklat av företaget Syscom..

The aim of this study is to examine metaphors and what may be perceived as motif-circuits in Stig Dagerman?s play Den dödsdömde (The Man Condemned to Death) and the two short stories ?Den dödsdömde? (The Man Condemned to Death) and ?Mannen från Milesia? (The Man from Milesia). My intention is to discuss a single theme and identity-marks that unites all three works, using Paul Ricoeur?s The Rule of Metaphor (La mêtaphore vive) as well as the ?thematic critique? of Jean-Pierre Richard.What is metaphor for Ricoeur is for Richard themes (theme): an organizing principle, a sort of schedule around which a world is constituted. Hence, I find similarities between the motif-circuits, Ricoeur?s metaphor-theory and Richards?s themes.

Conclusions: A myriad of interpretations are possible when studying and discussing a particular organizational culture. As culture can not be removed from its context, we illuminate the effects that the internationalization process has with regards to unifying the organizational culture in our particular setting studied. Maintaining however, that a reflexive look at this culture shows no single interpretation as being sufficient, we try to expose its richness and ambiguities through a three perspective approach..

The aim of this study is to examine metaphors and what may be perceived as motif-circuits in Stig Dagerman?s play Den dödsdömde (The Man Condemned to Death) and the two short stories ?Den dödsdömde? (The Man Condemned to Death) and ?Mannen från Milesia? (The Man from Milesia). My intention is to discuss a single theme and identity-marks that unites all three works, using Paul Ricoeur?s The Rule of Metaphor (La mêtaphore vive) as well as the ?thematic critique? of Jean-Pierre Richard.What is metaphor for Ricoeur is for Richard themes (theme): an organizing principle, a sort of schedule around which a world is constituted. Hence, I find similarities between the motif-circuits, Ricoeur?s metaphor-theory and Richards?s themes.

Since prehistoric time man has used wood to build their environment. The material?s availabilitycombined with its good mechanical properties has often made it the material of choice. Like allmaterials exposed to natures degradative processes the properties of wood decreases over time.Rot, UV radiation and attacks by insects and pests damage wood if not protected. Since we wantwhat we build to consist, optimizing our building materials durability is of great interest.Techniques and methods for increasing the endurance of wood have been developed in severaldifferent places and for a long time.

During the last decades the housing sector has increased continuously, and housings and services accounted for 40 % of the energy usage in Sweden during 2011. The expansion in number of buildings in society has resulted in an increase in both energy usage and emissions of greenhouse gases. It is crucial to enable a sustainable development of society and as a result, the demand to reduce the emissions of carbon dioxide is a current question. In this study, the carbon dioxide emitted from the housing sector in Stockholm is estimated. The housing sector can be divided into different types of houses such as apartment blocks, single-family houses and holiday houses. By collecting information of the energy purchased in respective households, a computational model is generated that calculates the total emission of carbon dioxide.

Growth models are very useful tools for forestry to predict growth and yield. With growth models and optimising tools you can manage forest stands in a way that maximize benefit and income. There are three major types of growth models. Stand models; stage structured models and single-tree models. The most advanced models give the most accurate forecasts.

The purpose of this thesis is to evaluate the combination of bibliographic coupling and three hierarchical cluster analytic techniques: average, complete and single linkage. Bibliographic coupling is applied as a measure of similarity between recently published articles and the cluster techniques are used for the partition of a set of articles into subsets of articles with similar research focus. The field of information science is applied as the test arena and the selection of data, i.e., the article population to be partitioned, is based on a number of central journals. Methods of evaluation include both quantitative approaches as well as a qualitative one. For comparing the resulting partitions, adjusted Rand index is utilized and for the establishment of cluster coherence and isolation, measures of average normalized coupling strength is applied.