Logo des Repositoriums

Auflistung nach Autor:in "Engel, Thomas"

1 - 4 von 4
  • Konferenzbeitrag
    Analyzing PeerFlow – A Bandwidth Estimation System for Untrustworthy Environments
    (SICHERHEIT 2020, 2020) Mitseva, Asya; Engel, Thomas; Panchenko, Andriy
    Tor is the most popular low-latency anonymization network comprising over 7,000 nodes run by volunteers. To balance the user traffic load over the diverse resource capabilities of these nodes, Tor guides users to choose nodes in proportion to their available bandwidth. However, self-reported bandwidth values are not trustworthy. Recently, a new bandwidth measurement system, PeerFlow, has been proposed aiming to solve the Tor bandwidth estimation problem. In this work, we introduce the first practical analysis of PeerFlow. We proposed a set of strategies for the practical realization of probation periods in PeerFlow and showed that many Tor nodes cannot recover to their normal state after one measuring period. We also demonstrated that low-bandwidth adversaries gain significantly higher bandwidth estimates exceeding the theoretically defined security boundaries of PeerFlow.
  • Konferenzbeitrag
    Automatisierung der Einzelkornsaat unter besonderer Berücksichtigung der Aussaatqualität
    (Informationstechnologie für eine nachhaltige Landbewirtschaftung – Fokus: Forstwirtschaft, 2012) Rothmund, Matthias; Engel, Thomas
    Ziel des Projekts ist die Optimierung von Aussaatbild und Flächenleistung. Erreicht wird dies durch die weitgehende Automatisierung des Arbeitsprozesses. Dabei nehmen die Ermittlung der Aussaatqualität und die Steuerung der Vorfahrtsgeschwindigkeit eine zentrale Stellung ein. Beschrieben werden weiterhin die Konfiguration des Gesamtsystems und dessen Felderprobung.
  • Konferenzbeitrag
    MeBIT – an interdisciplinary project on "information" metaphors and their impact on the idea of man
    (SIGSAND-EUROPE 2008: Proceedings of the Third AIS SIGSAND European Symposium on Analysis, Design, Use and Societal Impact of Information Systems, 2008) Bölker, Michael; Engel, Thomas; Gutmann, Mathias; Henckel, Ulrike; Hesse, Wolfgang; Müller, Dirk; Rathgeber, Benjamin; Russ, Aaron; Syed, Tareq
    MebIT is an interdisciplinary project granted by the German Ministry for Education and Research (BMBF). Its focus of research concerns the logical interconnections and relationships which combine the Informatics, Information Technology (IT) and Information Systems (IS) fields with other scientific branches – in particular biology/genetics and philosophy – and which are established through the extensive use of metaphors form these fields (like information, programming, code, replication, etc.). The technical endowment of almost all public domains by IT and IS might be accompanied by a mental shift – triggered and promoted by metaphoric language and might ultimately lead to the formation on new images of man. Our research group is composed of four subgroups, dealing with these questions from an information-theoretical, genetic, anthropological and technique-philosophical point of view. Some preliminary results of the joint work of these groups are demonstrated by three interconnected posters.
  • Konferenzbeitrag
    Teaching in the cyber-age: technologies, experiments, and realizations
    (DeLFI 2005: 3. Deutsche e-Learning Fachtagung Informatik, 13. - 16. September 2005 in Rostock, Germany, 2005) Linckels, Serge; Meinel, Christoph; Engel, Thomas
    In this paper we describe the role of teachers in the cyber-age and how new teaching methods in a computer-based learning environment can foster exploratory learning. An overview of modern e-learning technologies is described and illustrated with examples. We also present our e-learning tool CHESt; an interactive expert system that answers students' questions expressed in natural language. Then we present the results of experiments made in schools with CHESt. We discuss the pertinence and convenience of keyword and semantic search engines as didactical tool for querying multimedia knowledge sources. Finally, we analyze how students accept to enter complete questions in a semantic search to reduce the number of results, in opposition to a keyword search.