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- W2394933761 abstract "The Internet in general, and the Web 2.0, together with the trend towards mobile terminals in particular, have recently had an immense impact on the society. As a result of these developments, users nowadays produce data on an unprecedented scale. This new kind of data has attracted the attention of researchers from a wide variety of disciplines. In this thesis we contribute some small pieces to the huge interdisciplinary efforts to understand this implicitly and explicitly generated data. More importantly, we put these analytic efforts into a practical context by making the insights directly accessible to the end-users by means of concrete applications. In the first part of the thesis we investigate the interconnections between people in (online) social networks. Based on some relevant properties of these networks, we then propose two mobile applications, one to assist a user who wants to address a group of people from within a resource restricted device, and one that unobtrusively searches for potential friends while the user is pursuing everyday activities. The second part of the thesis studies the extraction of similarity measures from user generated content. We thereby focus on two main domains: Scientific conferences and music. We show that a large collection of publication records implicitly contains information about different aspects of conference similarities. Two of these aspects – quality and thematic scope – form the fundamental building blocks of confsearch, a conference search engine we have implemented. Our conference similarity measure is further used to draw a map of conferences using a graph embedding algorithm and to discuss the world of conferences in a playful manner. Towards the end of the thesis we discuss different facets of music similarity and its use in end-user applications. In particular, we take advantage of the fact that the cumulated listening histories of a large user basis contain valuable information about the similarity of songs. The resulting similarity measure is known to better reflect the users’ perception than state-of-the-art audio based methods. However, it lacks a compact representation as known from audio based techniques, a fact that greatly complicates the design of intuitive user interfaces. To overcome this problem, we pick up the idea of a map, as already discussed in the context of scientific conferences. In particular, we propose to compactly embed our usage data based music similarity measures into a Euclidean space. For this purpose, we make use of two different techniques, one that solely relies on the listening behavior, and one that combines this data with the more explicit information contained in social tags. We finally demonstrate the practical usefulness of the concept of a music map in a comprehensive mobile music player for the Android platform that gained a remarkable popularity. In a user study, we show that the integrated similarity aware features are frequently used. From this study, and from user comments, we conclude that our map in fact facilitates the design of similarity based music retrieval interfaces, and that such interfaces are also well accepted by the community." @default.
- W2394933761 created "2016-06-24" @default.
- W2394933761 creator A5003406386 @default.
- W2394933761 date "2011-01-01" @default.
- W2394933761 modified "2023-09-26" @default.
- W2394933761 title "Understanding and organizing user generated data: methods and applications." @default.
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