Zugl.: Paderborn, Universiẗat, Diss., 1994.

Abschlussarbeiten (Bachelor-, Diplomarbeiten) aus der Fakultät für Mathematik und Informatik

Wir berichten über eine experimentelle Studie zu lokalen Suchverfahren für das Pairing-Problem bei Fluggesellschaften unter Benutzung realer Testdatensätze mit bis zu 4600 Fl"ugen kurzer Reichweite. Unter einer Run-Cutting Formulierung vergleichen wir Verfahren wie Simulated Annealing, Modifikationen der Wasserspiegel-Algorithmen nach Dueck, eine elementare Implementation von Tabu Suche sowie einen GRASP Ansatz. Es zeigt sich, da"s die Wasserspiegel-Algorithmen vergleichbare Ergebnisse wie Simulated Annealing, und um etwa 40% bessere Ergebnisse als blo"se lokale Verbesserungsheuristiken liefern, w"ahrend Tabu Suche und GRASP hier ungeeignet erscheinen. Die Ergebnisse von Simulated Annealing und der Wasserspiegel-Algorithmen k"onnen sich auch mit den LP-Schranken f"ur die SET PARTITIONING Formulierung mit Packungsungleichungen und bis zu 3.9 Millionen Spalten messen. Eine Clustering-Parallelisierung des Simulated Annealings auf einem Parallelrechner GigaCluster PowerPlus weist eine sehr gute Beschleunigung auf. / For the airline pairing problem using a run-cutting formulation. Computational results are reported for some real-world short-haul testproblems with up to 4600 flights per month. In particular, we evaluate the relative performance of simulated annealing, modified versions of the waterlevel algorithms proposed by Dueck, an elementary tabu search, and a GRASP approach. We find that the waterlevel algorithms compare well with simulated annealing and both improve on mere improvement heuristics by about 40%. Tabu search and GRASP do not yield competitive results here. Simulated annealing and the waterlevel algorithms also compare favourably with LP-bounds for a SET PARTITIONING formulation with knapsack constraints containing up to 3.9 million columns. A clustering parallelization of simulated annealing on a GigaCluster PowerPlus parallel computer exhibits an excellent speed-up.

<p>Under IT-boomen i början av 2000-talet släpptes regeringens IT-proposition som bland annat behandlade svenska folkets tillgång till bredband med hög överföringskapacitet. Kommunerna fick i uppdrag att bygga en infrastruktur för bredband baserad på fiber genom så kallade stadsnät. Förhållningen från staten var att näten skulle byggas enligt en öppen modell som skulle stimulera fri konkurrens och operatörsneutralitet. Detta skulle i slutändan resultera i ökad valfrihet för kunden och ett ökat tjänsteutbud.</p><p>I denna magisteruppsats har vi undersökt hur affärsmodellen som stadsnät ar-betar efter inverkar på tjänsteutbudet. Vi har även identifierat andra faktorer som påverkar tjänsteutvecklingen. Resultatet av denna undersökning har utvecklats till en modell som beskriver intressentstrukturen och vilka krafter som verkar mellan dessa intressenter samt de faktorer som påverkar tillväxten på tjänstesidan.</p><p>För att erhålla en djup förståelse för det studerade ämnet har en undersökning genomförts med hjälp av en webbenkät innehållande såväl kvantitativa som kvalitativa inslag. Webbenkäten har skickats till 90 stadsnät i Sverige och vi erhöll en svarsfrekvens på 71 %.</p><p>Magisteruppsatsen visar att stadsnäten i vårt urval kan delas in i två grupper; stadsnät där det råder fri konkurrens och neutralitet samt stadsnät som inte lyckats attrahera några kommersiella tjänsteleverantörer. Bristen på externa tjänsteleverantörer har lett till att stadsnätsägare har tvingats erbjuda tjänster i egen regi. För litet kundunderlag anses vara en bidragande orsak till tjänsteleverantörernas ointresse.</p> / <p>During the IT-era in the beginning of the 21st century high speed Internet connection for all citizens was on the top of the agenda. The Swedish government proposed a government bill stating that all Swedish citizens should have access to a broadband connection. The local municipalities were given the mission to build this new fiber-optic IT-infrastructure. The municipalities should adopt an open access network enabling all service providers to connect themselves to the network. The network should encourage competitive advantage and impartiality towards service providers resulting in increased service options for the citizens.</p><p>This master thesis investigates how the chosen business model affects the service offerings. We have also identified other factors that influence the development of service offerings. The result of this investigation concludes with a model that describes which factors that influences the growth of services in the municipal fiber network.</p><p>To get a deeper understanding of the studied subject have the authors conducted a web survey including qualitative and quantitative elements. The survey was sent to 90 municipal fiber networks. 71 % of these networks answered the questionnaire.</p><p>The result of this master thesis shows that the municipal fiber networks could be divided into two different groups. The first groups containing networks where the open access network is working and the other group where there is a lack of interest from the service providers. The lack of interest from service providers results in that municipal fiber network operators are forced to offer services themselves. The reason for this is often caused by an insufficient customer base.</p>

<p>In todays sociaty the use of information systems is wide spread and many corporations and buisnesses both in large and small spread make use of more advanced and sopisticated systems. Larger corporations have their own IT sections that maintain and updates their systems on a daily basis. They have the money and resources for it by how do the small businesses coop with it. How satisfied are the small businesses that are maybe runing on systems that might not be supplying the needs that the business is in need of. In this paper we investigate this question in the form of a questionnaire. The investigation is conducted in a selected part of the market in the swedish city of Växjö. The purpose of the investigation is to see how satisfied 30 businesses are with their information systems. The investigations background comes from a similar american investigation and it’s the papers purpose to compare the results that arose during the american studie with the swedish results to see what diffrences and similaritys there is. The investigation spans over 3 sector of bueisnesses, trade, service and consult. The investigation studies how these 3 sectors satisfaction relates to one and other, how satisfied and disatisfiedthey are in different parts of their IT systems.</p>

Stuttgart, Univ., Diplomarbeit, 2008.

Stuttgart, Univ., Fakultät Informatik, Studienarb., 1996.

Zugl.: Bamberg, Universiẗat, Diss., 2008.

Zugl.: Erlangen-Nürnberg, Universiẗat, Diss., 2009.

This report examines the relationship between usability and subjective judgments about aesthetic and emotional aspects of users of a web production. Through the development of two prototypes that reflects different aspects of usability and subjective assessments examined the consequences of a differentiation of the concepts and Usability and Likeability. Thereafter, an evaluation of the two prototypes are made through user testing. Finally, the results of the evaluation is presented and are related to the concepts of usability and likeability.