004 Datenverarbeitung; Informatik
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“Did I say something wrong?” A word-level analysis of Wikipedia articles for deletion discussions
(2016)
This thesis focuses on gaining linguistic insights into textual discussions on a word level. It was of special interest to distinguish messages that constructively contribute to a discussion from those that are detrimental to them. Thereby, we wanted to determine whether “I”- and “You”-messages are indicators for either of the two discussion styles. These messages are nowadays often used in guidelines for successful communication. Although their effects have been successfully evaluated multiple times, a large-scale analysis has never been conducted. Thus, we used Wikipedia Articles for Deletion (short: AfD) discussions together with the records of blocked users and developed a fully automated creation of an annotated data set. In this data set, messages were labelled either constructive or disruptive. We applied binary classifiers to the data to determine characteristic words for both discussion styles. Thereby, we also investigated whether function words like pronouns and conjunctions play an important role in distinguishing the two. We found that “You”-messages were a strong indicator for disruptive messages which matches their attributed effects on communication. However, we found “I”-messages to be indicative for disruptive messages as well which is contrary to their attributed effects. The importance of function words could neither be confirmed nor refuted. Other characteristic words for either communication style were not found. Yet, the results suggest that a different model might represent disruptive and constructive messages in textual discussions better.
This thesis presents an approach to optimizing the computation of soft shadows from area lights. The light source is sampled uniformly by traversing shadow rays as packets through an N-tree. This data structure stores an additional line space for every node. A line space stores precomputed information about geometry inside of shafts from one to another side of the node. This visibility information is used to terminate a ray. Additionally the graphics processing unit (short GPU) is used to speed up the computations through parallelism. The scene is rendered with OpenGL and the shadow value is computed on the GPU for each pixel. Evaluating the implementation shows a performance gain of 86% by comparison to the CPU, if using the GPU implementation. Using the line space instead of triangle intersections also increases the performance. The implementation provides good scaling with an increasing amount of triangles and has no visual disadvantages for many rays.
Proceedings des FWS 2015
(2016)
Die Aufnahme, Verarbeitung und Analyse farbiger bzw. mehrkanaliger Bilder gewinnt seit Jahren ständig an Bedeutung. Diese Entwicklung wird durch die verbesserten technischen Möglichkeiten und die stetig steigenden Ansprüche aus den vielfältigen Anwendungsfeldern in Industrie, Medizin, Umwelt und Medien befördert. Diesem Trend folgend wurde in Koblenz 1995 erstmals der Workshop Farbbildverarbeitung durchgeführt und hat sich seitdem als jährlich stattfindende Veranstaltung etabliert. Als Veranstaltung der German ColorGroup bietet der Workshop ein Diskussionsforum für Forscher, Entwickler und Anwender, das sich den Problemen der Farbtheorie, Farbmessung, Farbbildaufnahme und spektralen Bildgewinnung ("hyper-spectral imaging") genauso wie der Entwicklung von neuen Methoden und Algorithmen zur Verarbeitung und Analyse von Farbbildern und mehrkanaligen (spektroskopischen) Bilddaten widmet. Ebenso nehmen Fragestellungen der farbtreuen Bildreproduktion auf verschiedenen Ausgabemedien wie auch die Nutzung von Methoden und Verfahren der Farbbildverarbeitung im Rahmen der industriellen Qualitätskontrolle sowie in Robotik und Automatisierung gebührenden Platz ein.
This habilitation thesis collects works addressing several challenges on handling uncertainty and inconsistency in knowledge representation. In particular, this thesis contains works which introduce quantitative uncertainty based on probability theory into abstract argumentation frameworks. The formal semantics of this extension is investigated and its application for strategic argumentation in agent dialogues is discussed. Moreover, both the computational as well as the meaningfulness of approaches to analyze inconsistencies, both in classical logics as well as logics for uncertain reasoning is investigated. Finally, this thesis addresses the implementation challenges for various kinds of knowledge representation formalisms employing any notion of inconsistency tolerance or uncertainty.
The goal of this thesis is to create and develop a concept for a mobile city guide combined with game-based contents.
The application is intented to support flexible and independent exploration of the city of Koblenz.
Based on the geographical data, historical information for and interesting stories of various places were provided in this application. These informations are combined with playful elements in order to create a motivating concept.
Therefore, related approaches were examined and, combined with own ideas, a new concept has been developed. This concept has been prototypically implemented as an Android application and afterwards evaluated by 15 test persons. A questionnaire was used to examine the operability, the motivation of game patterns and the additional value of the application.