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AG Netzbasierte Informationssysteme
FU Berlin
Königin-Luise-Straße 24-26
14195 Berlin

Tel.: +49-30-838-75221
Fax: +49-30-838-75220

This site is no longer maintained. You see a static copy as of April 1 2016.

Poster Digital Art Research and Knowledge Processing

A poster on an NBI activity in digital humanities was presented at the Workshop “Grenzen überschreiten – Digitale Geisteswissenschaft heute und morgen” on 28.02.2014.: Digital Art Research and Knowledge Processing.


 … [...Weiterlesen/more...]

Technical Report: Initial report on digitally researching the network drawings of Mark Lombardi

New NBI publication:

Robert Tolksdorf. Initial report on digitally researching the network drawings of Mark
Lombardi. Technical Report TR-B-13-03, Freie Universität Berlin, 2013. PDF.

Abstract: We do digital research on the artist Mark Lombardi (1951-2000) as an experiment in methods for digital art history. We manually generate GraphML representations of the networks depicted in his drawings and publish them at Services on the data are implemented like textual search on labels of nodes or an index on what persons or institutions appear in which works.

We visualize the networks with nodes linked to Wikipedia information about the actors. With calculations on the networks we generate synthetic drawings from multiple original works that overlap in actors.… [...Weiterlesen/more...]


NBI-Dozentin Stefanie Demmler ist Mitautorin eines neuen Buchs zu Power-Napping:

Stefanie Demmler, Solveig Lanske, Dörthe Ziemer. „30 Minuten Power-Napping“. GABAL Verlag. 2013. 96 Seiten:
„Schlafen am Arbeitsplatz gilt immer noch als faul und wird von der Gesellschaft kaum akzeptiert. Dabei ist es wissenschaftlich erwiesen, dass maximal 30 Minuten Schlaf in der Mittagspause die Leistungsfähigkeit für den gesamten Tag steigern und gleichzeitig das Risiko für Herz-Kreislauf-Erkrankungen verringern. Die Autorinnen zeigen, wie Power-Napping funktioniert, wie es in der Praxis umgesetzt werden kann und wie es Ihren Alltag nachhaltig verändert – beruflich und privat.“… [...Weiterlesen/more...]

Proceedings of ESWC workshops with NBI involvement published

Now online: Proceedings of the 10th ESWC 2013 Conference Workshops: BeRSys2013, AImWD2013 and USEWOD2013. NBI was active in the 2nd Workshop on Artificial Intelligence meets the Web of Data (AImWD2013) and the 3rd International Workshop on Usage Analysis and the Web of Data (USEWOD2013).… [...Weiterlesen/more...]

Latest NBI PhD thesis by Hannes Mühleisen published

As the final step for the successful completion of his PhD, Hannes Mühleisen thesis has been published online:

Hannes Mühleisen. Architecture-independent distributed query processing. PhD thesis. Freie Universität Berlin, 2013.… [...Weiterlesen/more...]

DigiPolis survey paper published in IJWIS Journal

The DigiPolis project here at AG NBI is developing a Self-organized Semantic Storage Service (“S4″). A survey paper written by NBI staff members Hannes Mühleisen, Tilman Walther and Prof. Robert Tolksdorf was just published in the International Journal of Web Information Systems. The publication is titled “A survey on self-organized semantic storage”, here the abstract:

Purpose – The purpose of this paper is to show the potential of self-organized semantic storage services. The semantic web has provided a vision of how to build the applications of the future. A software component dedicated to the storage and retrieval of semantic information is an important but generic part of these applications. Apart from mere functionality, these storage components also have to provide good performance regarding the non-functional requirements scalability, adaptability and robustness. Distributing the task of storing and querying semantic information onto multiple computers is a way of achieving this performance. However, the distribution of a task onto a set of computers connected using a communication network is not trivial. One solution is self-organized technologies, where no central entity coordinates the system’s operation.

Design/methodology/approach – Based on the available literature on large-scale semantic storage systems, the paper analyzes the underlying


Information Technology and the Art Market

Prof. Tolksdorf authored a catalogue text for PREVIEW BERLIN – THE EMERGING ART FAIR discussing how information technology could drive innovation in the art market (deutsche Version hier).… [...Weiterlesen/more...]

DigiPolis project publication accepted at CEC2011 conference

The DigiPolis project at AG NBI is developing a Self-organized Semantic Storage Service („S4“). A research paper written by NBI staff members Hannes Mühleisen, Tilman Walther and Prof. Robert Tolksdorf discussing the handling of different index levels within this system was just accepted for the 2011 IEEE Congress on Evolutionary Computation (CEC2011) , New Orleans, USA.
The publication is titled „Multi-Level Indexing in a Distributed Self-Organized Storage System“, here the abstract:

In many systems providing storage and retrieval operations on data, indices are used to make these operations more efficient. Distributed storage systems provide means to distribute the burden of storing and retrieving data on multiple different computers. Routing indices can answer the central question in these systems: Where should one look for a specified data item? To be able to query for different columns in a relation or different entries in tuples, indexing for multiple dimensions is necessary. Our group applies a swarm-based approach to distributed storage leading to a new class of distributed systems, which are fully self-organized in their behavior and lack any shared global data structures. Here, we research whether multiple levels of routing indices can be maintained and used in such a


Paper accepted at SAKS 2011

The paper „Towards Swarm-based Federated Web Knowledgebases“ by Philipp Obermeier, Anne Augustin and Robert Tolksdorf has been accepted at the Workshop on Self-Organising, Adaptive, Context-Sensitive Distributed Systems (SAKS). Its abstract is

Nowadays internet knowledgebases are more and more described using ontological vocabularies. However, efficient coherent solutions for both federated storage and reasoning upon widely distributed web repositories are rarely explored.
To this end we present a self-organized, distributed storage and reasoning approach based on swarm intelligence exploiting the strong applicability of swarm algorithms to distributed environments. Our concept comprises two layers of swarm algorithms – storage and reasoning layer – for information storage and inference of new statements, respectively. We present for the former our concepts with first evaluation results and give for the latter a general swarm-based concept for forward-chaining assertional reasoning in the description logic ALC.


DigiPolis project publication accepted at SSWS2010 workshop

The DigiPolis project at AG NBI is developing a Self-organized Semantic Storage Service („S4“). A research paper written by NBI staff members Hannes Mühleisen, Tilman Walther, Anne Augustin and Marko Harasic under the supervision of Prof. Robert Tolksdorf describing the impact of various configuration parameters on this system was just accepted for the The 6th International Workshop on Scalable Semantic Web Knowledge Base Systems (SSWS2010) at the 9th International Semantic Web Conference (ISWC2010), Shanghai, China.
The publication is entitled „Configuring a Self-Organized Semantic Storage Service“, here the abstract:

Scalability requirements for semantic stores lead to distributed hardware-independent solutions to handle and analyze massive amounts of semantic data. We use a different approach by imitating the behaviour of swarm individuals to achieve this scalability. We have implemented our concept of a Self-organized Semantic Storage Service (S4) and present preliminary evaluation results in order to investigate to what extent the performance of a distributed and swarm-based storage system is dependent on its configuration.

AG Netzbasierte Informationssysteme,
Königin-Luise-Straße 24-26, 14195 Berlin, Tel.: +49-30-838-75221, Fax: +49-30-838-75220