Institute for Web Science and Technologies · Universität Koblenz - Landau


Querying spatial data in the SemanticGIS project - Towards a new version of GeoSPARQL?

22.08.19. The GeoSPARQL standard is used to define relations between geospatial objects in the semantic web and is in use in many contexts since its emergence in the year 2012. However, due to the experiences in the SemanticGIS project with our project partners we see that the standard cannot hold up to many application cases the GIS community is confronted with thereby hindering its adoption in the GIS community. In particular, lacking support for geometry manipulations, raster data and 3D or even nD coordinates is of concern. This talk presents GeoSPARQL-ext, an extension of GeoSPARQL solving many of the issues the geospatial community has with the current standard and presents application cases which could make use of the new functionality. [mehr lesen...]

A General Approach to Reasoning with Probabilities

15.08.19. We propose a general scheme for adding probabilistic reasoning capabilities to a wide variety of knowledge representation formalisms and we study its properties. Syntactically, we consider adding probabilities to the formulas of a given base logic. Semantically, we define a probability distribution over the subsets of a knowledge base by taking the probabilities of the formulas into account accordingly. This gives rise to a probabilistic entailment relation that can be used for uncertain reasoning. Our approach is a generalization of many concrete probabilistic enrichments of existing approaches, such as ProbLog (an approach to probabilistic logic programming) and the constellation approach to abstract argumentation. [mehr lesen...]

Discovering Visual Stimuli of Dynamic User Interface

08.08.19. Analyses of graphical interface usability commonly inquire how a static stimulus (a static Web page, a static Swing interface, etc.) is aligned with responses of users, such as mouse or eye movements, mouse clicks or keyboard entries. Then, a usability expert may interpret the numerical statistics, or a visualization thereof, gain insights and suggest improvements to the graphical user interface (GUI). Nowadays, however, GUIs exhibit rich behaviors of their own, choreographing dynamic elements and orchestrating dynamic reactions to user responses rendering common methods for analysis of GUI usability increasingly difficult, if not impossible. [mehr lesen...]

Time-invariant Preferential Attachment in Complex Networks

01.08.19. Real networks rarely grow uniformly in time. However, this aspect is not considered in the original Barabasi-Albert model and is mostly overlooked by its kin. The linear growth of the network results in the early mover advantage. We show empirical evidences that in real networks degree growth of nodes is, on the contrary, often time-invariant, i.e., node degree grows with time, on average, in the same way regardless of the node's time of appearance. While different growth forms of the network can be considered, we show that the exponential growth is not only approximately fulfilled in many real systems but also the key to the time-invariant degree growth of nodes. [mehr lesen...]

Introducing: Computational Communication Science Lab Amsterdam

01.08.19. Studying human communication and its effects increasingly requires analysis of various sources of online data and large archives of news and political texts. Therefore, the Vrije Universiteit Amsterdam and the University of Amsterdam started a collaboration last year to develop and stimulate the use of computational methods in communication science research. – the Computational Communication Science Lab Amsterdam. This presentation will give a short overview of the different projects and tools that are currently part of this project to point to possible avenues for interdisciplinary cooperation. All our tools, analyses and results are as transparent, open and easy to share and reuse as possible. [mehr lesen...]

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