Detta arbete är ett examensarbete i matematik på kandidatnivå vid Växjö universitet. Det är en studie av kodningsteori i allmänhet med fokusering på cykliska koder och Reed-Solomon-koder i synnerhet. Reed-Solomon-koderna används för att skapa McElieces kryptosystem. En kortfattad analys av McElieces kryptosystems säkerhet görs tillsammans med en genomgång av kända sätt att forcera denna typ av kryptosystem. Här visar det sig att användning av Reed-Solomon-kod försvagar kryptosystemet i förhållande till om den ursprungligt föreslagna Goppa-koden används.

En säker informationskanal med hög överföringskvalitet krävs i dessa dagar när informationsöverföringen ökar för varje år som går. Det finns olika sätt att skapa detta. Antingen genom att se till att överföringsmediet är av mycket hög kvalitet eller att skapa en skyddsmekanism som gör att de överföringsfel som kan uppstå kan detekteras och även korrigeras om man önskar detta. Denna uppsats handlar om detta, att kunna detektera och korrigera fel. Denna gren inom matematiken kallas kodningsteori.Uppsatsen presenterar grunden för kodningsteorin, för att sedan presentera några vanligt förekommande kodningsalgoritmer, Hamming koder, BCH koder, Reed-Solomon.

The Savi?s Warbler (Locustella luscinioides) is a recently established bird species in a few reedy shallow lakes of southern Sweden and has only been found nesting for the last twenty years. Little is known about the species' habitat preferences, breeding biology and demands for specific territory structures at breeding sites in Sweden. Knowledge of a newly established species? habitat requirements is essential to maintain a viable population and design action plans.

AbstractSurface-water includes different kinds of pollutants from traffic and roads. To prevent these pollutants to reach nearby lakes one can construct surface-water ponds on locations with heavy traffic. At Bergviks shopping centre in Karlstad, two ponds, one smaller and one bigger has been constructed in order to decrease the pollutant pressure from the receiving waters of Kattfjorden. Several heavy metals are essential for plants and animals in low concentration but when they occur in higher concentrations, they become toxic to the organism. The larger pond at Bergviks shopping centre has a sedimentation function so the heavy metals sink to the bottom thereby not releasing directly in to Kattfjorden.

That ecological and evolutionary processes can take place on the same time scale is a recent insight. Today we also know that they are directly linked to each other. In the lake Tåkern, in year 2000, there was a structural change when phytoplankton declined and submerged vegetation, mainly stoneworts began to spread. This led to evolutionary changes in the aquatic sowbug, Asellus aquaticus which had previously been limited to the reed, most likely feeding on detritus. But then, sowbugs could exploit the new habitat in stoneworts and a new food resource in terms of periphyton.

The purpose of this study is to understand how codes of conduct function within the context of supply chain of electronic industry. This is a qualitative research and a case study is the research approach. Conclusions are that the codes of conducts could be perceived differently within different contexts. Therefore, cultural and legal issues should be considered while formulating, implementing codes of conduct or assessing the compliance..

This study is based on AgroSeas business idea from environmental problems to valuable resource, with the objective to optimize a method to purify the already eutrophicated Baltic Sea by harvesting water plants, mainly reed. The nutrients will then be recirculated to arable land through residues from biogas production. The amount of nutrients that can be removed by harvesting the biomass depends on the amounts of biomass and the nutrient content of it, which in turn is strongly dependent on the nutrient concentration of the surrounding water. Vegetation suggested in the study for an effective nutrient uptake is helophytes: reed, cattails, reed canary grass, reed sweet grass in shallower water and lemnoideaes: duckweed and nymphaeids in the deeper parts. Competitive species has high purification ability but requires regular maintenance to avoid channeling and overgrowth. Regarding time and method of harvest, effectiveness may be improved by: harvesting plants above the water level and after flowering, a border is kept, harvesting twice a season, a bigger machine and a regular maintenance. This literature has illuminated a major environmental problem and it has been suggested optimizations for a method for cleaning the Baltic Sea through harvesting water plants, but to get a definite answer for the optimal method for each site tests should be carried out, this because many factors determine to what is suitable for each, specific environment. .

The use of fossil fuels such as coal and gas are a contributor to the global warming. The climate change is a worldwide problem with far reaching consequences that is believed to be very expensive. The United Nations has been introducing a framework convention on climate change. One component of the convention is the Kyoto protocol. The protocol is obligating the developed countries to decrease their emissions of greenhouse gases by 5.2 percent during the time period 2008-2012.

The public library is an institution that throughout history has been associated with anumber of social codes, that seem to be deeply rooted in the minds of the public. Thesecodes regulates how users act and interact in the library environment and as a library useryou have to obtain knowledge about these social codes.This master's thesis aims at studying how these codes are transferred to children in the earlyschool-age, how children react to the social codes and what effects they have on thechildren's development into library users.The empirical material used in this study consists of observations and interviews. Theobservations are conducted during two school classes visits to a public library and focuseson the interaction between librarians, the children and their teachers, and the interviewswere conducted with the two librarians responsible for the library visits.The theories used in this master's thesis consists of symbolic interactionism, in the form oftheories by George Herbert Mead and Erving Goffman, Peter L. Berger and ThomasLuckmanns theories regarding the concept of institutions. Another theory that's used in thismaster's thesis is the one concerning the social aspects of information literacy focusing onthe concept of epistemic communities as presented by Kimmo Tuominen, Reijo Savolainenand Sanna Talja.The result of this study is that the social codes are communicated to the children primarilyby the teachers rather than the librarians.

ABSTRACTTitle:Estate agent is a trusted profession - a study of how real estate broker working on Codes of ConductLevel:Final assignment for Bachelor Degree in Business AdministrationAuthor:Mikaela KarlssonSupervisor:Agneta SundströmDate:2012 ? JuneAim:There is a lack of confidence in the branch of real estate which makes me wonder: How do the bransch of real estate work with Code of Conduct to strengthen their confidence? The aim is to describe and analyze how the branch of real estate works with confidence and codes of conduct.Method:I have an qualitative approach in which interviews have been used to collect data and literature studies to collect theoretical information. The collected material have been analyzed from a hermeneutical perspective.Result & Conclusions:To some extent the real estate branch works with the establishment of Codes of Conduct to strengthen the confidence. This is shown by increased transparency to increase customers commitment in the bidding. As confidence has been risen for the part of the process this indicate that Codes Of Conduct has the ability to strengthen the confidence for the real estate as a branch.Suggestions for future research:One topic that is interesting to study is how the real estate brokerage companies could controll their stakeholders to follow the company´s guidelines for social responsibility.Contribution of the thesis:The thesis gives people involved in real estate branch suggestions on how a trust could be built up by working with Codes of Conduct.Key words:Corporate Social Responsibility, Code of Conduct, confidence, real estate broker, the bransch of real estate..

ABSTRACTTitle:Estate agent is a trusted profession - a study of how real estate broker working on Codes of ConductLevel:Final assignment for Bachelor Degree in Business AdministrationAuthor:Mikaela KarlssonSupervisor:Agneta SundströmDate:2012 ? JuneAim:There is a lack of confidence in the branch of real estate which makes me wonder: How do the bransch of real estate work with Code of Conduct to strengthen their confidence? The aim is to describe and analyze how the branch of real estate works with confidence and codes of conduct.Method:I have an qualitative approach in which interviews have been used to collect data and literature studies to collect theoretical information. The collected material have been analyzed from a hermeneutical perspective.Result & Conclusions:To some extent the real estate branch works with the establishment of Codes of Conduct to strengthen the confidence. This is shown by increased transparency to increase customers commitment in the bidding. As confidence has been risen for the part of the process this indicate that Codes Of Conduct has the ability to strengthen the confidence for the real estate as a branch.Suggestions for future research:One topic that is interesting to study is how the real estate brokerage companies could controll their stakeholders to follow the company´s guidelines for social responsibility.Contribution of the thesis:The thesis gives people involved in real estate branch suggestions on how a trust could be built up by working with Codes of Conduct.Key words:Corporate Social Responsibility, Code of Conduct, confidence, real estate broker, the bransch of real estate..

This report contains CFD-simulations of cable tray fires in nuclear power plant applications with the CFD-code SMAFS. Furthermore the report evaluates the use of CFD-codes within this kind of problems. The assessment of this report is that there is a tendency towards the good use of CFD-codes but before using it solely more research has to be done on the subject..

The purpose of this report is to find out which crops, that are good for strawfuel, and can be grown i the area around the city of Lund. The background of this report it that Lunds energy is planning to bild a biofuelheated thermal power station in Örtofta outside of Lund. I have in the report limited me to the crops hemp, whole crop (triticale), reed canary grass, elephant grass and jerusalem artichoke. I have through a documentary research checked the crops, cultivabillity in the south of Sweden, and how they should fit, in the Scanian crop sequence. Hemp is an annual crop which probably could manage in the Scanian crop sequence. Whole crop often triticale because of it´s high yield and low rate of shed seed. Could also fit into the crop sequence of crop in Scanian. Triticale is annual, and could be grown at the same kind of fields as used to wheat, whith is why it would be possible to grow it in Scania. Reed canary grass is a reedlike grass that is easy grown at most soils.

In today?s society, employees are the businesses face toward the public. By establishing dress codes, companies can control the customers? impression. The purpose of this thesis is to investigate and analyze the existing regulations regarding dress codes in companies.

The purpose of this Masters thesis is to compare classification codes and feature headings of three different universal classification schemes SAB, UDC and DDC, when classifying archaeological literature. The aim is to determine whether a subject analysis of a title generates similar feature headings in the three systems, and to find positive and negative things about each system from an archaeological point of view. The comparison and the analysis of the 22 chosen archaeological monographs showed that the subject analysis of the titles didnt always generate similar feature headings. This could depend on several things, for example different interpretations of the subject analysis of a document, less knowledge about the system and/or the subject, or the fact that its not the same classifier that creates the codes. The study also showed that the different classification systems did treat the subject archaeology a bit differently, and that its difficult to say that one of them is better for classifying archaeological literature.