Publikationen

| 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 |

2015

Timo Lindhorst, Edgar Nett
Dependable communication for mobile robots in industrialwireless mesh networks
In: Cooperative Robots and Sensor Networks 2015. - Cham [u.a.] : Springer International Publ., S. 207-227 - (Studies in Computational Intelligence; 604) ; ISBN: 978-3-319-18299-5 DOI: 10.1007/978-3-319-18299-5_10
http://www.springerprofessional.de/010---dependable-communication-for-mobile-robots-in-industrial-wireless-mesh-networks/5739414.html
Mobile robots inevitably require a wireless network for communication. Wireless mesh networks (WMNs) allow for increased flexibility and an easy integration of mobile robots. Hence, they are well suited for present and future cyber-physical industrial applications. The high dependability requirements of that application domain, however, issue particular challenges to the communication network, especially regarding the mobility of stations. In this chapter, we present various approaches and mechanisms to provide dependable communication for mobile robots in industrial WMNs. These comprise different cross-layer techniques to allow for seamless mobility and an admission control that explicitly considers station mobility to avoid network overload. Evaluation results are gathered by both simulation and real-world experiments while case-studies supplement the results. The outcome is a network architecture that allows for seamless communication even for mission-critical applications on mobile robots.

2014

Timo Lindhorst, Burkhard Weseloh, Edgar Nett
Dependable Admission Control for Mission-Critical Mobile Applications in Wireless Mesh Networks
Proceedings of the 33rd IEEE Symposium on Reliable Distributed Systems
Wireless Mesh Networks (WMNs) provide a promising foundation for a flexible
and reliable communication infrastructure in industrial environments. Meeting
the QoS demands of industrial applications, though, requires the deployment of
an admission control to avoid network overload. The presence of mobile
stations, however, causes dynamics within the network that severely impacts
the available capacity. For instance, if a communication route switches from
one to two hops, twice the resources are consumed due to self-interference. To
neither jeopardize QoS guarantees nor having to cancel present flows, our
dependable admission control scheme foresees and considers those dynamics
during resource reservation to handle station mobility.
We describe a highly dependable approach and further propose an estimation
method that improves network efficiency. The evaluation results show that our
novel approach allows for a dependable admission control even in presence of
mobile stations and thus enables the network to provide a new class of
guarantee for mission-critical mobile applications.
@InProceedings{srds14,
  Title                    = {Dependable Admission Control for Mission-Critical Mobile Applications in Wireless Mesh Networks},
  Author                   = {Timo Lindhorst and Burkhard Weseloh and Edgar Nett},
  Booktitle                = {Proceedings of the 33rd IEEE Symposium on Reliable Distributed Systems},
  Year                     = {2014},
  note = {to appear},
}
Jana Fruth, Edgar Nett
Uniform Approach of Risk Communication in Distributed IT Environments Combining Safety and Security Aspects
Kongressband, Computer Safety, Reliability, and Security - SAFECOMP 2014 Workshop-Proceedings, s. 298-300, September 8-12, 2014, Florence, Italy
The trend to compose real time systems with standard IT known from conventional office domains results in heterogeneous technical environments. Examples are modern industrial process automation networks. It is a challenging task, because of potential impacts of security incidents to the system safety. For example, robot control units could be manipulated by malicious codes. The term “risk communication” is introduced, to describe alarm communication in human-machine
interaction scenarios. User adapted risk communication between humans and industrial automation systems, including home robotics, can prevent hazards and/or threats to the entire system safety and security. Current safety and security risk communication standards are compared to examine the adequacy for our uniform approach. This paper focuses on alarm
system standards in the industrial process automation domain and intrusion detection systems from the conventional desktop IT domain. A uniform model based approach for risk communication in distributed IT environments is introduced.
Timo Lindhorst, Burkhard Weseloh, Edgar Nett
Maintaining Dependable Communication Service for Mobile Stations in Wireless Mesh Networks by Tracking Capacity Demands
Proceedings of the 28th IEEE International Parallel & Distributed Processing Symposium
Wireless Mesh Networks (WMNs) provide a promising foundation for a flexible
and reliable communication infrastructure in industrial environments. Meeting
the QoS demands of industrial applications, though, requires the deployment of
an admission control to avoid network overload. The presence of mobile
stations, however, causes dynamics within the network that severely impacts
the available capacity. For instance, if a communication route switches from
one to two hops, twice the resources are consumed due to self-interference. To
neither jeopardize QoS guarantees nor having to cancel present flows, our
dependable admission control scheme foresees and considers those dynamics
during resource reservation to handle station mobility.
We describe a highly dependable approach and further propose an estimation
method that improves network efficiency. The evaluation results show that our
novel approach allows for a dependable admission control even in presence of
mobile stations.
@InProceedings{Lindhorst14dpdns,
  Title                    = {Maintaining Dependable Communication Service for Mobile Stations in Wireless Mesh Networks by Tracking Capacity Demands},
  Author                   = {Timo Lindhorst and Burkhard Weseloh and Edgar Nett},
  Booktitle                = {Proceedings of the 28th IEEE International Parallel \& Distributed Processing Symposium},
  Year                     = {2014},
  Publisher                = {IEEE}
}

2013

Henning Trsek, Tim Tack, Omid Givehchi, Juergen Jasperneite, and Edgar Nett
Towards an Isochronous Wireless Communication System for Industrial Automation
18th IEEE International Conference on Emerging Technologies and Factory Automation, September 10-13, 2013 Cagliary, Italy
Deploying wireless technologies in industrial automation becomes more and more common. It is an enabler for many innovative applications where moving system components are involved, e. g. rotating parts of machines. However, many of such applications impose high temporal requirements on the wireless system, for instance isochronous data communication. Today, these requirements can not be met by existing solutions, such as IEEE 802.11 Wireless Local Area Networks (WLANs). In this paper, an isochronous wireless communication system is investigated. It mainly consists of a deterministic medium access control, based on IEEE 802.11, which is extended with additional features for isochronous communication. The presented preliminary analysis shows the system’s feasibility for the targeted industrial applications and presents promising performance improvements in comparison with standard mechanisms.
Timo Lindhorst, Georg Lukas, Edgar Nett
Wireless Mesh Network Infrastructure for Industrial Applications - A Case Study of Tele-operated Mobile Robots
18th IEEE International Conference on Emerging Technologies and Factory Automation, September 10-13, 2013 Cagliary, Italy
The deployment of wireless communication networks in industrial facilities allows for increased flexibility and seamless integration of mobile participants. Time-critical control applications are generally realized with dedicated wireless sensor networks while common WLAN infrastructure networks allow high-throughput best-effort communication. To provide high-capacity communication as well as real-time service quality, we developed and implemented a Wireless Mesh Network (WMN) infrastructure for industrial applications. An example application that requires these properties is the video-based tele-operation of a mobile robot, which we present as case study in this work. It shows the applicability of our infrastructure as well as the necessity of its comprised components.
@INPROCEEDINGS{Lindhorst13,
  author = {Timo Lindhorst, Georg Lukas and Edgar Nett},
  title = {Wireless Mesh Network Infrastructure for Industrial Applications
        - A Case Study of Tele-operated Mobile Robots},
  booktitle = {18th IEEE International Conference on Emerging Technologies \& Factory
        Automation (ETFA)},
  year = {2013},
  file = {:Lindhorst13.pdf:PDF},
  owner = {timo},
  timestamp = {2013.09.18}
}
Frank Engelhardt, Timo Lindhorst, Edgar Nett
Tolerating Packet Losses in Wireless Mesh Networks
2013 IEEE 27th International Symposium on Parallel & Distributed Processing Workshops and PhD Forum, 20-24 May 2013, Boston (MA) USA
Wireless Mesh Networks (WMNs) provide a promising foundation for a flexible and reliable communication infrastructure in industrial environments. Meeting the QoS demands of real-time applications, though, requires the deployment of various advanced mechanisms. Compared to wired networks, applications face higher packet loss rates in wireless networks due to the inherent unreliability of wireless communication. Furthermore, if mobile stations are involved, links that fail due to node movement frequently cause packet losses. In this paper, we present an approach to tolerate those specific losses by locally recovering lost packets and transiently re-routing them over an alternative path. The evaluation in real-world experiments shows that we can completely prevent packet loss without significantly increasing the end-to-end latency. This allows the deployment of WMNs for real-time applications without explicitly considering the increased error-proneness of wireless communication and station mobility.
Svilen Ivanov, Edgar Nett
Localization-Based Radio Model Calibration for Fault-Tolerant Wireless Mesh Networks
Industrial Informatics, IEEE Transactions on , vol.9, no.1, pp.246-253, Feb. 2013

2012

Svilen Ivanov, Edgar Nett
Achieving Fault-Tolerant Network Topology in Wireless Mesh Networks (Buchkapitel)
Wireless Mesh Networks - Efficient Link Scheduling, Channel Assignment and Network Planning Strategies, ISBN: 978-953-51-0672-2 ; DOI: 10.5772/50173
http://www.intechopen.com/articles/show/title/achieving-fault-tolerant-network-topology-in-wireless-mesh-networks
Christian Zöllner, Manuela Kanneberg
Ego.tech-on: entrepreneurship and technology education for young people (Talk)
International Entrepreneurship Education Conference (IEEC 2012), Plymouth, UK, 14. September 2012
B. Malinowsky, J. Grønbæk, H.P. Schwefel, A. Ceccarelli, A. Bondavalli, E. Nett
Timed Broadcast via Off-the-Shelf WLAN Distributed Coordination Function for Safety-Critical Systems
In Proceedings of 9th European Dependable Computing Conference (EDCC 2012), Seite 144-155, Sibiu, Romania, 08-11.Mai 2012
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6214769
Svilen Ivanov, Edgar Nett
Using Localization for Fault-tolerant Radio Coverage in Wireless Mesh Networks
In Proceedings of 26th IEEE International Parallel and Distributed Processing Symposium (IPDPS 2012), 17th IEEE Workshop on Dependable Parallel, Distributed and Network-Centric Systems (DPDNS 2012), Shanghai, China, 21-25. Mai 2012

2011

Timo Lindhorst, Georg Lukas and Edgar Nett
Modeling Medium Utilization for Admission Control in Industrial Wireless Mesh Networks
In Proceedings of the 30th IEEE International Symposium on Reliable Distributed Systems, October 4-7, 2011. Madrid, Spain
@inproceedings{Lukas2011srds,
  author = {Georg Lukas and Timo Lindhorst and Edgar Nett},
  title = {Modeling Medium Utilization for Admission Control in Industrial Wireless Mesh Networks},
  booktitle = {IEEE International Symposium on Reliable Distributed Systems},
  publisher = {IEEE},
  year = {2011}
}
Frank Engelhardt
Umsetzung eines Online-SLAM-Verfahrens auf der Roboterplattform VolksBot-Lab
In Informatik aktuell: Herausforderungen durch Echtzeitbetrieb - Echtzeit 2011, Fachtagung des GI/GMA - Fachausschusses Echtzeitsysteme, Boppard, November 3.-4., 2011; Springer
Frank Engelhardt, Timo Lindhorst and Ansgar Bredenfeld
Umsetzung eines Online-SLAM-Verfahrens auf der Roboterplattform VolksBot-Lab
In Virtuelle Instrumente in der Praxis 2011, Messtechnik Automatisierung Begleitband zum 16. VIP-Kongress, 24.-25. Oktober 2011, VDE Verlag.
Kurzfassung
Die Fähigkeit eines autonomen mobilen Roboters, während der Fahrt seine Umgebung zu kartieren, eröffnet ihm ein weites Spektrum von Anwendungen. In dieser Arbeit wird ein Online-SLAM-Verfahren präsentiert, das auf dem cRIO-Echtzeitsystem des Roboters VolksBot-Lab lauffähig ist und bei Indoor-Szenarien sowohl im Zeitverhalten als auch in der Kartenqualität sehr zuverlässige Ergebnisse liefert. Das Robotersystem kommt derzeit im Rahmen einer Lehrveranstaltung der Universität Magdeburg zum Einsatz.

Abstract
The ability of an autonomous mobile robot to explore and map its environment during operation opens a variety of applications. In this paper we present an online-SLAM solution, which runs on the cRIO realtime controller of the robot VolksBot-Lab. It provides reliable results in both its map quality and timing behavior concerning indoor scenarios. The robot is currently used within the scope of a student project at the University of Magdeburg.
@inproceedings{VIP2011,
  author = {Frank Engelhardt and Timo Lindhorst and Ansgar Bredenfeld},
  title = {{Umsetzung eines Online-SLAM-Verfahrens auf der Roboterplattform VolksBot-Lab}},
  booktitle = {{Virtuelle Instrumente in der Praxis 2011}},
  publisher = {VDE Verlag},
  year = {2011},
  month = {September}
}
Georg Lukas
Wireless-Mesh-Network-Infrastruktur mit Ende-zu-Ende-Dienstgütegarantien
In KOMMA 2011, 2. Jahreskolloquium Kommunikation in der Automation, 27.-28. September 2011, Magdeburg, Germany
Drahtlose Kommunikation spielt eine immer größere Rolle in industriellen Anwendungen. Gleichzeitig erfordern es diese Anwendungen aber, dass das Netzwerk Ende-zu-Ende-Dienstgüte garantieren und umsetzen kann. Drahtlose vermaschte Netzwerke (Wireless Mesh Networks, WMN) sind hervorragend für die Flexibilitätsanforderungen gerüstet, bieten aber keine inhärente Dienstgüte. In dieser Arbeit werden Methoden der Fehlertoleranz angewendet, um eine für industrielle Anwendungen geeignete WMN-Infrastruktur bereitzustellen. Die Infrastruktur wird vorgestellt und in Teilen evaluiert, um die Praxistauglichkeit des Ansatzes zu belegen.
@inproceedings{Lukas2011komma,
  author = {Georg Lukas},
  title = {{Wireless-Mesh-Network-Infrastruktur mit Ende-zu-Ende-Dienstgutegarantien}},
  booktitle = {Kommunikation in der Automation},
  year = {2011},
  volume = {2}
}

2010

Stefan Werner Knoll, Till Plumbaum, Jan Leif Hoffmann, and Ernesto William De Luca
Collaboration Ontology: Applying Collaboration Knowledge to a Generic Group Support System
In Proceedings of the 11th Conference on Group Decision and Negotiation (GDN), June 21st-23rd, 2010, Delft, the Netherlands
Collaboration is a social and interactive process, where participants join efforts toward a group goal. A Group Support Systems (GSS) can improve the productivity of collaboration work by structuring activities and improving communication. However, knowledge is needed for the faithful appropriation of the GSS technology. In this paper we present ongoing research about a supporting framework for a generic GSS that adapts the GSS technology automatically to a logical model of a collaboration process. Drawing on Collaboration Engineering and the logical model, the paper explore the use of an ontology to capture and share knowledge about collaboration. As a result, we present a collaboration ontology that builds a common vocabulary for the key concept of collaboration and the relations and dependencies between them. A generic GSS can use the ontology to enable knowledge exchange between experts and practitioners. This will increase the potential benefits of a GSS for collaboration.
@inproceedings{cite:GDN2010,
  author = {Stefan Werner Knoll and Till Plumbaum and Jan Leif Hoffmann and Ernesto William De Luca},
  title = {Collaboration Ontology: Applying Collaboration Knowledge to a Generic Group Support System},
  booktitle = {Proceedings of the 11th meeting on Group Decision and Negotiation (GDN2010)},
  year = {2010},
}
Timo Lindhorst, Georg Lukas, Edgar Nett, and Michael Mock
Data-mining-based Link Failure Detection for Wireless Mesh Networks
In Proceedings of the 29th IEEE International Symposium on Reliable Distributed Systems, 31 October - 4 November, 2010, New Delhi, India
Mobile robot applications operating in wireless environments require fast detection of link failures in order to enable fast repair. In previous work, we have shown that cross-layer failure detection can reduce failure detection latency significantly. In particular, we monitor the behavior of the WLAN MAC layer to predict failures on the link layer. In this paper, we investigate data mining techniques to determine which parameters, i.e., the events, or combination and timing of events, occurring on the MAC layer most probably lead to link failures. Our results show, that the parameters revealed with the data mining approach produce similar or even more accurate failure predictions than achieved so far.
@inproceedings{Lindhorst2010-srds,
  author = {Timo Lindhorst and Georg Lukas and Edgar Nett and Michael Mock},
  title = {Data-mining-based Link Failure Detection for Wireless Mesh Networks},
  booktitle = {IEEE International Symposium on Reliable Distributed Systems},
  publisher = {IEEE},
  year = {2010},
  month = {November}
}
Svilen Ivanov and Edgar Nett
Fault-tolerant Base Station Planning ofWireless Mesh Networks in Dynamic Industrial Environments
In Proceedings of the IEEE International Conference 2010 - Emerging Technologies and Factory Automation, 13 - 16 Semptember, 2010, Bilbao, Spain
Ansgar Bredenfeld, Manuela Kanneberg, Timo Lindhorst, and Edgar Nett
Im Praxistest
In A&D Vorsprung Automation, November 2010, München, pp. 120-122
Die Universität Magdeburg bietet Informatikstudenten die Möglichkeit, in Software-Projekten die Theorie in die Praxis umzusetzen. Das Projekt Teamrobotik vermittelte so anhand von mobilen VolksBot-RT3-Robotern unter anderem Erfahrungen im Bereich Bildverarbeitung, Navigation und Hinderniserkennung.
@article{praxistestAD,
  author = {Ansgar Bredenfeld and Timo Lindhorst and Manuela Kanneberg and Edgar Nett},
  title = {Im Praxistest},
  journal = {A\&D Vorsprung Automation},
  year = {2010},
  volume = {November},
  pages = {120-122}
}
Svilen Ivanov, Scholz R., Schemmer S. and Schumann R.
Informationssicherheit mit Standardtechnologien: Referenzmodell für risikobasierte Maßnahmenauswahl
atp edition -- Automatisierungstechnische Praxis *7-8*, 222--225.
Svilen Ivanov and Adamczyk, H.
Lebenszyklusorientiertes Risikomanagement in COTS-basierten Systemen
in VDI-Expertenforum "IT Security in der Automation - Verstehen und Handeln!", Frankfurt, Germany
Timo Lindhorst, Georg Lukas, and Edgar Nett
Modeling Fast Link Failure Detection for Dependable Wireless Mesh Networks
In Proceedings of the 9th IEEE International Symposium on Network Computing and Applications, 15 - 17 July, 2010, Cambridge, MA, USA
Wireless Mesh Networks (WMN) provide a flexible and inexpensive way to expand network applications to mobile entities. However, high communication reliability demands can not be met by regular WMNs due to mobility and inherent properties of wireless communication. Failing links are common events which impose a major challenge for providing a dependable communication service. By the use of suitable cross-layer models, we provide a timely detection of failed links without compromising the network stability. It is shown that the packet loss caused by a link failure can be reduced from a time-dependent value to at most four consecutive packets. For a typical control application this means an improvement by a factor of 100. In addition to an empirical evaluation we demonstrate the applicability of the mechanism by utilizing it in a real-world WMN to allow the tele-operation of a mobile robot.
@inproceedings{Lindhorst2010,
  author = {Timo Lindhorst and Georg Lukas and Edgar Nett},
  title = {Modeling Fast Link Failure Detection for Dependable Wireless Mesh Networks},
  booktitle = {IEEE International Symposium on Network Computing and Applications},
  publisher = {IEEE},
  year = {2010},
  month = {July},
  doi = {http://doi.ieeecomputersociety.org/10.1109/NCA.2010.13}
}
Svilen Ivanov, Scholz R., Schemmer S. and Schumann R.
Security in der drahtlosen Automatisierung: Ein Referenzmodell hilft bei der risikobasierten Maßnahmenauswahl
in VDI Kongress Automation, Baden-Baden, Germany
Timo Lindhorst, Manuela Kanneberg, Edgar Nett and Ansgar Bredenfeld
VolksBot mit CompactRIO und LabVIEW - Erfahrungen aus der Lehrveranstaltung "Teamrobotik"
15. Technologie- und Anwenderkongress VIP 2010 - „Virtuelle Instrumente in der Praxis“ ; 27.-28. Oktober 2010, Fürstenfeld bei München, Germany
@inproceedings{VIP2010,
  author = {Ansgar Bredenfeld and Timo Lindhorst and Manuela Kanneberg and Edgar Nett},
  title = {VolksBot mit CompactRIO und LabVIEW - Erfahrungen aus der Lehrveranstaltungsreihe "Teamrobotik"},
  booktitle = {Virtuelle Instrumente in der Praxis 2010},
  publisher = {VDE Verlag},
  year = {2010},
  month = {October}
}

2009

Georg Lukas, André Herms, Svilen Ivanov, E. Nett
Dependable Wireless Mesh Networks: An integrated approach
International Journal of parallel, Emergent and Distributed Systems, April 2, 2009
Volume 24, Issue 2 April 2009, pages 151-169
Wireless Mesh Networks (WMNs) are gaining popularity in many application areas because of their low cost and high flexibility. Technically, a WMN forms a distributed network-centric system which aims to provide communication services to the application layer, but has no built-in dependability provisions. To make the network dependable, many problems have to be solved on different layers. With this paper, we describe our ongoing work to provide an integrated solution to increase the dependability of WMNs. Our approach combines network coverage planning on the physical layer, bandwidth management on the link layer and live network monitoring to improve the reliability, availability and maintainability of a WMN. We provide fine-grained means to improve the predictability of the network components, thus making the WMN more dependable. In this paper, we present first results of our work, and describe how they are interleaved.
@article{cite:Lukas2009,
  author = {Georg Lukas and Andr{\'e} Herms and Svilen Ivanov and Edgar Nett},
  title = {{Dependable Wireless Mesh Networks: An Integrated Approach}},
  journal = {International Journal of Parallel, Emergent and Distributed Systems},
  year = {2009},
  month = {April},
  volume = {24},
  number = {2},
  pages = {1--21},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2009/ijpeds\_lhin2009.pdf},
  doi = {10.1080/17445760802544086}
}
Michael Schulze, Georg Lukas
MLCCA - Multi-Level Composability Check Architecture for Dependable Communication over Heterogeneous Networks
In Proceeding of the 14th International Conference on Emerging Technologies and Factory Automation (ETFA 2009), IEEE, Mallorca, Spain, September, 22-26, 2009
During the design of complex networked systems, it is cruical to ensure the composability of the deployed applications and network protocols. Special care has to be taken to provide non-functional requirements like bandwidth and latency. Existing solutions only tackle this problem during the design phase; later refactoring or added components are not covered, potentially causing QoS violations. We propose MLCCA, a multi-level architecture which complements the design-time composability checks with additional automatic checks performed at compile-time and at run-time. The required infrastructure is embedded into our communication middleware FAMOUSO, making it transparent to application developers. The architecture has been evaluated in a tele-operated mobile robot case study. If the QoS attributes could not be fulfilled due to refactoring or changed conditions, no communication was allowed by the middleware, ensuring that the application could enter a fail-safe state. No data was sent over insufficient channels. Thus, our combination of FAMOUSO and MLCCA enables the sustainable deployment of complex networked systems.
@inproceedings{cite:Schulze2009b,
  author = {Michael Schulze and Georg Lukas},
  title = {{MLCCA -- Multi-Level Composability Check Architecture for Dependable Communication over Heterogeneous Networks}},
  booktitle = {{14th International Conference on Emerging Technologies and Factory Automation (ETFA 2009)}},
  address = {Mallorca, Spain},
  year = {2009},
  month = {September},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2009/mlcca_schulze_lukas_2009.pdf}
}
Timo Lindhorst
Schichtübergreifende Früherkennung von Verbindungsausfällen in drahtlosen Mesh-Netzwerken
In Informatik aktuell: Software-intensive verteilte Echtzeitsysteme - Echtzeit 2009, Wolfgang A. Halang, Peter Holleczek (Hrsg.);
Fachtagung des GI/GMA - Fachausschusses Echtzeitsysteme, Boppard, November 19-20, 2009;
ISBN 978-3-642-04782-4, Springer-Verlag
Drahtlose Mesh-Netzwerke (WMNs) bilden aufgrund ihrer Selbstorganisation ein flexibles Kommunikationssystem. Bei der Erkennung einzelner Verbindungsausfälle, die bei der Integration mobiler Teilnehmer unvermeidbar sind, ist bei aktuellen Routingprotokollen die Kommunikation jedoch für mehrere Sekunden unterbrochen. In dieser Arbeit wird gezeigt, wie durch Nutzung von Informationen aus der MAC-Schicht ein Ausfall frühzeitig erkannt und dadurch die Anzahl der Paketverluste von mehreren Hundert auf maximal vier reduziert werden kann. Hierdurch wird die Zuverlässigkeit und Verfügbarkeit von WMNs erhöht und ihr Einsatz für Echtzeit-Anwendungen ermöglicht.
@inproceedings{cite:xalf-boppard09,
  author = {Timo Lindhorst},
  title = {Schichtübergreifende Früherkennung von Verbindungsausfällen in drahtlosen Mesh-Netzwerken},
  booktitle = {Software-intensive verteilte Echtzeitsysteme - Echtzeit 2009},
  publisher = {Springer},
  year = {2009},
  month = {November},
  pages = {67 ff.}
}
Georg Lukas, Christian Fackroth
WMNSec - Security for Wireless Mesh Networks
Proceedings of the 2009 - IWCMC - International Wireless Communications & Mobile Computing, Germany - Leipzig, June 21-24, 2009
Wireless Mesh Networks (WMNs) are gaining popularity as a flexible and inexpensive replacement for Ethernet-based infrastructure. However, WMN security has not been covered adequately by existing standards and implementations. We propose WMNSec, an adaptation of the IEEE 802.11i security standard, specifically targeted at Wireless Mesh Networks and accounting for limited CPU power, node mobility and interruption-free connectivity. WMNSec has been implemented on top of the MadWifi Linux driver and the hostapd suite. Experimental results from a real WMN show that even in a small eight-node network, WMNSec reduces the authentication time by up to a factor of 3 compared to 802.11i, while allowing mobile stations to move without performing additional authentications. The reduced overhead and the mobility feature confirm the practical usability of WMNSec, finally allowing to deploy WMNs in a secure way.
@inproceedings{cite:Lukas2009wmnsec,
  author = {Georg Lukas and Christian Fackroth},
  title = {{WMNSec -- Security for Wireless Mesh Networks}},
  booktitle = {IWCMC 2009 Computer and Network Security Symposium},
  year = {2009},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2009/wmnsec_lukas2009.pdf}
}

2008

Georg Lukas, André Herms, Svilen Ivanov, E. Nett
An Integrated Approach for Reliability and Dependability of Wireless Mesh Networks
13th IEEE Workshop on Dependable Parallel, Distributed and Network-Centric Systems DPDNS '08, 2008
Wireless Mesh Networks (WMNs) are gaining popularity in many application areas because of their low cost and high flexibility. Technically, a WMN forms a distributed network-centric system which aims to provide communication services to the application layer, but has no built-in dependability provisions. To make the network dependable, many problems have to be solved on different layers. With this paper, we describe our ongoing work to provide an integrated solution to increase the dependability of WMNs. Our approach combines network coverage planning on the physical layer, bandwidth management on the link layer and live network monitoring to improve the reliability, availability and maintainability of a WMN. We provide fine-grained means to improve the predictability of the network components, thus making the WMN more dependable. In this paper, we present first results of our work, and describe how they are interleaved.
@inproceedings{cite:LHIN2008,
  author = {Georg Lukas and Andr{\'e} Herms and Svilen Ivanov and Edgar Nett},
  title = {An Integrated Approach for Reliability and Dependability of Wireless Mesh Networks},
  booktitle = {13th IEEE Workshop on Dependable Parallel, Distributed and Network-Centric Systems DPDNS '08},
  year = {2008},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2008/dependable_wmn_camera_ready.pdf}
}
Svilen Ivanov, E. Nett, Stefan Schemmer
Automatic WLAN Localization for Industrial Automation
in '7th IEEE International Workshop on Factory Communication Systems (WFCS 2008), May 20-23, 2008, Dresden, Germany'.
[PDF]
Georg Lukas, E. Nett, Svilen Ivanov
Distributed Event Synconization for Diagnosing Wireless Mesh Networks
Int. Workshop on Dependable Network Computing and Mobile Systems (DNCMS 08); Naples, Italy, October 5th, 2008
in conjunction with the 27th IEEE Int. SRDS 2008
@inproceedings{cite:Lukas2008,
  author = {Georg Lukas AND Edgar Nett AND Svilen Ivanov},
  title = {{Distributed Event Synchronization for Diagnosing Wireless Mesh Networks}},
  booktitle = {{Proceedings of the International Workshop on Dependable Network Computing and Mobile Systems, DNCMS'08}},
  year = {2008},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2008/dncms08-enett.pdf}
}
Timo Lindhorst, André Herms, Michael Schulze
Einsatz einer Echtzeit-Publish/Subscribe-Kommunikation für die Teleoperation mobiler Roboter
In Informatik aktuell: Aktuelle Anwendungen in Technik und Wirtschaft - Echtzeit 2008, Wolfgang A. Halang, Peter Holleczek (Hrsg.);
Fachtagung des GI/GMA - Fachausschusses Echtzeitsysteme, Boppard, November 27-28, 2008;
ISBN 978-3-540-85323-7, Springer-Verlag
In der Telerobotik werden mobile Roboter über ein Kommunikationsnetz durch einen Operator ferngesteuert. Um interaktiv zu operieren, müssen Daten in beide Richtungen in Echtzeit kommuniziert werden. Zusätzlich ist eine hohe Ausfallsicherheit des Systems zu gewährleisten. Diese Arbeit beschreibt die Umsetzung eines solchen Szenarios unter Verwendung einer Echtzeit-Publish/Subscribe-Kommunikation. Ein drahtloses Mesh-Netzwerk erfüllt durch redundante Verbindungen die Anforderungen an die Kommunikation. Eine Publish/Subscribe-Middleware ermöglicht eine inhaltsbasierte Kommunikation und erlaubt dadurch eine hohe Flexibilität der Teilnehmer. Durch die modulare Software-Architektur der Applikationen entsteht ein verteiltes System, in dem mobile Roboter durch netzwerktransparente Kommunikation gesteuert werden.
Svilen Ivanov, E. Nett
Fault-Tolerant Coverage Planning in Wireless Networks
27th IEEE Int. Symposium on Reliable Distributed Sytems (SRDS), Naples, Italy, October 6-8, 2008
ISBN: 978-0-7695-3410-7 Seiten 175-184
[PDF]
Svilen Ivanov, E. Nett, André Herms
Feedback-controlled WLAN: Achieving Channel-Availability in Mesh Networks
in '7th IEEE International Symposium on Network Computing and Applications (IEEE NCA08), 10 - 12 July, Cambridge, MA USA'.
[PDF]
Svilen Ivanov, Georg Lukas, Stefan Schemmer
Monitoring and Diagnosis for Wireless Real-Time Applications
10. Wirless Technologies Kongresses 2008, Bochum 22-23.09.2008,
ISBN 978-3-89838-608-1, 158-166
@inproceedings{Lukas2008,
  author = {Georg Lukas and Svilen Ivanov and Stefan Schemmer},
  title = {{Monitoring and Diagnosis for Wireless Real-Time Applications}},
  booktitle = {10. Wirless Technologies Kongresses 2008, Bochum},
  year = {2008}
}
André Herms, Georg Lukas
Preventing Admission Failures of Bandwidth Reservation in Wireless Mesh Networks
Proceedings of Workshop on Radio Resource Management in Wireless Mesh Networks in The 6th ACS/IEEE International Conference on Computer Systenms and Applications (AICCSA'08), Qatar, April, 2008
Quality of Service for wireless mesh networks is an often requested feature for various kinds of applications. A common approach is the hop-by-hop reservation of bandwidth for individual routes. In this paper we address the problems of the reservation on a single hop. In previous works we used simulation studies to show that various existing approaches suffer from inconsistencies that lead to admission failures. In this paper, we discuss the reasons for these failures and present a protocol for preventing them. This allows to significantly increase the reliability of established communication links in WMNs.
@inproceedings{cite:Herms2008,
  author = {Andr{\'e} Herms and Georg Lukas},
  title = {Preventing Admission Failures of Bandwidth Reservation in Wireless Mesh Networks},
  booktitle = {Proceedings of Workshop on Radio Resource Management in Wireless Mesh Networks in The 6th ACS/IEEE International Conference on Computer Systenms and Applications (AICCSA'08)},
  address = {Doha, Qatar},
  year = {2008},
  month = {April},
  pages = {1094--1099},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2008/RRMinMesh_2_Herms.pdf}
}
André Herms, Michael Schulze
Publish/Subscribe Middleware für Selbstorganisierende Drahtlose Multi-Hop-Netzwerke
Workshop über Selbstorganisierende, Adaptive, Kontextsensitive verteilte Systeme, 2008
Das Routing in Wireless Mesh Networks hat einen dynamischen und selbstorganisierenden Charakter. Allerdings erfolgt die Kommunikation auf Anwendungsebene adressbasiert, was eine statische Zuordnung von Kommunikationspartnern erfordert. Dies wirkt der dynamischen Struktur leider entgegen. In dieser Arbeit beschreiben wir die Verbindung der Publish/Subscribe-Middleware COSMIC mit dem Routing-Protokoll AWDS. Durch Verwendung von COSMIC können Anwendungen inhaltsbasiert kommunizieren und sind nicht mehr auf die Kenntnis von Adressen angewiesen. Es wird das Konzept beschrieben und mittels Simulation und realen Messungen evaluiert. Hierbei zeigen wir, dass Wireless Mesh Networks geeignet sind, um in einer P/S-Infrastruktur eingesetzt zu werden.
E. Nett, André Herms, Stefan Schemmer
Real-Time Mesh Networks for Industrial Applications
Proceedings of 17th International Federation of Automatic Control World Congress (IFAC'08), Seoul, Korea, July 6-11, 2008

2007

André Herms, Georg Lukas
A Pragmatic Approach for QoS in Wireless Mesh Networks
Proceedings of WinsSys '07, Bacelona, Spain, 2007
WINSYS 2007, ISBN:978-989-8111-14-2, pp. 57-64.
In this paper we present a QoS routing protocol for IEEE-802.11 based mesh networks.The main challenge for providing QoS in terms of bandwidth and latency is that the medium is shared between all nodes in close range, which complicates reservation of medium time. Furthermore, the use of standard compliant hardware components requires an integration of the existing medium access mechanism, which is designed for best-effort communication only. A cluster-based structure is used for representing the local domains of the shared medium and allowing reservation of medium time. On top of this reservation an optimistic reactive algorithm is used for discovery and reservation of routes that fulfil the application specified QoS requirements. Simulation results are presented that prove the correctness of this approach.
@inproceedings{cite:Herms2007a,
  author = {Andr{\'e} Herms and Georg Lukas},
  title = {A Pragmatic Approach for {QoS} in Wireless Multihop Networks},
  booktitle = {International Conference on Wireless Information Networks and Systems -- {WinsSys} '07, Proceedings of},
  address = {Barcelona, Spain},
  year = {2007},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2007/qos_clusters.pdf}
}
André Herms, Georg Lukas, Svilen Ivanov, Stefan Schemmer
Echtzeitfähigkeit für Mesh-Netzwerke in der Automatisierung
SPS/IPC/Drives 2007, Elektrische Automatisierung - Systeme und Komponenten, Nürnberg, 27.- 29.11.2007
ISBN:978-3-8007-3069-8
Wireless LANs (IEEE 802.11) are increasingly used in industrial applications. Theyreduce cabling costs, increase flexibility and enable mobile applications for maintenance or logistics tasks. Mesh networks provide a self-configuring and - healing wireless backbone for large scale deployments (e.g. in process automation). This paper presents a routing algorithm which provides QoS in wireless mesh networks, thus leveraging their use in industrial applications. It allows reserving bandwidth for real-time flows based on measurements of the physically available bandwidth. Thus it fully utilizes the bandwidth while still preventing congestion. Simulation results demonstrate the reliability of the algorithm and its advantage over previous works.
@inproceedings{cite:Herms2007b,
  author = {Andr{\'e} Herms and Stefan Schemmer and Georg Lukas},
  title = {{Echtzeitfähigkeit für Mesh-Netzwerke in der Automatisierung}},
  booktitle = {Proceedings of {SPS/IPC/DRIVES, Elektrische Automatisierung, Systeme und Komponenten} '07},
  address = {Nurenberg, Germany},
  year = {2007},
  month = {November},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2007/sps2007-schemmer_v1.pdf}
}
Svilen Ivanov, André Herms, Georg Lukas
Experimental Validation of the ns-2 Wireless Model using Simulation, Emulation, and Real Network
In Proceedings of the 4th Workshop on Mobile Ad-Hoc Networks (WMAN'07) in conjunction with the 15th ITG/GI - Fachtagung Kommunikation in Verteilten Systemen (KiVS'07), 26. February - 2. March 2007 in Bern, Switzerland,
VDE Verlag, ISBN 978-3-8007-2980-7, pp. 433-444.
Wireless network research in the last years is often based on simulation.Ns-2 is a widely used wireless network simulation tool for this purpose.However, there are no published results about the accuracy of the ns-2 wireless model in the literature so far. In this paper we present a validation of the wireless model of ns-2 done by comparing the network characteristics of a simulated, an emulated, and a real wireless network. In order to show only the relevant differences, we have calibrated the radio propagation model of ns-2 to the real network and have used the same routing protocol implementation and the same application data traffic in all the compared networks. The results show that the packet delivery ratios, the connectivity graphs,and the packet latencies are represented in the model with an average error of 0.3 10 and 57% respectively. Based on these results we conclude that the packet delivery ratios, and network topologies are accurately represented in ns-2, once the simulation parameters are properly adjusted. The accuracy of the packet latencies is lower and therefore statements about latencies in the real network based on the simulation results have a lower validity. Based on these results we provide recommendations for future development of the ns-2.
@inproceedings{cite:Ivanov2007,
  author = {Svilen Ivanov and Andr{\'e} Herms and Georg Lukas},
  title = {{Experimental Validation of the {NS-2} Wireless Model using Simulation, Emulation, and Real Network}},
  booktitle = {Proceedings of the 4th Workshop on Mobile Ad-Hoc Networks (WMAN'07)},
  publisher = {VDE Verlag},
  year = {2007},
  month = {Feb. 26. -- March 2.},
  pages = {433 -- 444},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2007/wman07magdeburg.pdf}
}
Georg Lukas, André Herms, and Daniel Mahrenholz
Interval based Off-Line Clock Synchronization for Wireless Mesh Networks
Proceedings of the International Symposium on Computer Performance, Modeling, Measurements, and Evaluation volume 35, 2007, ACM.
Wireless mesh networks suffer from various problems like congestion or packet collisions. To identify and overcome these problems an exact global view of the communication is required. However, it is not possible to observe the whole network from a single location. Instead, a distributed monitoring is necessary, which has to include clock synchronization. We present a new interval-based algorithm for the off-line synchronization of passively monitored network events. It calculates the worst-case time interval for every event on a global clock, while considering inaccuracies caused by processing jitter and non-uniform clock drifts. The experimental evaluation on a live mesh network shows an accuracy of better than $130µs$ over a four-hop distance, which is below the minimum transmission time of data packets. Thereby, our algorithm creates a highly precise global view of the network, which allows a detailed diagnosis of wireless mesh networks.
@inproceedings{cite:Perf2007,
  author = {Georg Lukas and Andr{\'e} Herms and Daniel Mahrenholz},
  title = {Interval based Off-Line Clock Synchronization for Wireless Mesh Networks},
  booktitle = {Proceedings of the International Symposium on Computer Performance, Modeling, Measurements, and Evaluation},
  publisher = {ACM},
  year = {2007},
  volume = {35},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2007/2007_performance-offlinesync.pdf}
}
Svilen Ivanov, Stefan Schemmer
Lokalisierung im WLAN ? Neue Möglichkeiten und ihre Grenzen
9. Wirless Technologies Kongresses 2007, Stuttgart 18-19.09.2007
[PDF]
André Herms, Georg Lukas, Svilen Ivanov
Measurement-Based Detection of Interfering Neighbors for QoS in Wireless Mesh Networks
Mobile and Wireless Communications Summit, 2007. 16th IST, Budapest,Hungary 1-5 July 2007
ISBN:978-963-8111-66-1
Communication in wireless mesh networks based on the IEEE 802.11 WLAN standard is mainly governed by the carrier sensing based medium access. Knowledge about, which nodes influence each other, can improve the performance and is essential for QoS provision in terms of bandwidth guarantees. However, until now only approximations for the determination of station in carrier sense range are used. We present an exact solution by measuring the carrier sense in static wireless mesh networks. Simulation studies and measurements are done that verify the correctness of the protocol and reveal some significant properties of the carrier sense. It is shown that the carrier sense relation is neither strict nor symmetric in the general case, in opposite to the assumptions normally found in literature. We further conclude that for evaluation better simulation models are required that match these properties.
@inproceedings{cite:Herms2007,
  author = {Andr{\'e} Herms and Georg Lukas and Svilen Ivanov},
  title = {Measurement-Based Detection of Interfering Neighbors for {QoS} in Wireless Mesh Networks},
  booktitle = {16th IST Mobile and Wireless Communications Summit 2007, Proceedings of},
  year = {2007},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2007/interf-mobilesummit2007.pdf},
  doi = {10.1109/ISTMWC.2007.4299081}
}
Svilen Ivanov, E. Nett, Stefan Schemmer
Planning Available WLAN in Dynamic Production Environments
FeT'2007, 7th IFAC International Conference on Fieldbuses and Networks in Industrial and Embedded Systems, Toulouse, France, November 7 - 9, 2007
[PDF]
André Herms, Georg Lukas, Svilen Ivanov
Precise Admission Control for Bandwidth Reservation in Wireless Mesh Networks
Proceedings of 4th Intl. Conference on Mobile Ad-Hoc and Sensor Networks
MASS'07, Pisa, Italy, October, 2007
ISBN:1-4244-1455-5
Quality of service in wireless mesh networks is an often requested feature for various kinds of applications. A common approach is the establishment of routes based on hop-by-hop reservation of bandwidth. In this paper we address the problems of admission control in wireless mesh networks. We show that the existing solutions suffer from temporal inconsistencies during the distributed admission process, which lead to high admission failure rates of approximately 2% to 10% in typical topologies, even with the best approach. A solution for this problem is presented, based on the two phase commit protocol. It prevents inconsistencies and the corresponding admission failures.
@inproceedings{cite:Herms2007c,
  author = {Andr{\'e} Herms and Svilen Ivanov and Georg Lukas},
  title = {Precise Admission Control for Bandwidth Reservation in Wireless Mesh Networks},
  booktitle = {Proceedings of 4th Intl. Conference on Mobile Ad-Hoc and Sensor Networks {MASS'07}},
  address = {Pisa, Italy},
  year = {2007},
  month = {October}
}
E. Nett, C. Tres, L. Buss Becker
Real-Time Tasks Scheduling with Value Control to Predict Timing Faults during Overload
10th IEEE International Symposium on Object and component-oriented Real-time distributed Computing (ISORC 2007), May 7-9 2007, Santorini, Greece

2006

Spiro Trikaliotis, Georg Lukas
Evaluating a Clock Synchronization for Dependable Sensor Networks
In Proceedings of the 20th IEEE International Parallel & Distributed Processing Symposium, DPDNS Workshop, Rhodes Island, Greece 2006
A synchronized clock is an important prerequisite for many distributed algorithms. This clock is used to give an "occured before" relationship, as well as for synchronizing distributed actions. There are many clock synchronization algorithms with varying precisions and assumptions on the underlying network topology. In this paper, a synchronization protocol is presented which achieves a high precision in the order of 20us to 30us in a one-hop wireless environment, and a multiple of this value for multi-hop wireless networks, such as sensor networks. The protocol works reliably even if message losses occur, which is very likely in wireless networks. For this, it utilizes redundancy in the sent time information. This protocol is implemented and evaluated on standard PC hardware running RT-Linux/Free, and an outline of the extension for multi-hop scenarios is given.
@inproceedings{cite:Trikaliotis2006,
  author = {Spiro Trikaliotis and Georg Lukas},
  title = {Evaluating a Clock Synchronization for Dependable Sensor Networks},
  booktitle = {Proceedings of the 20th IEEE International Parallel and Distributed Processing Symposium},
  address = {Rhodes Island, Greece},
  year = {2006},
  month = {May},
  pages = {345}
}
Manuela Kanneberg, M. Müllerberg, J. Börding, U. Peterson, G. Theidig
Girls Day - Mädchen-Zukunftstag und mehr, Projekte zur Berufsorientierung von Mädchen
W.Bertelsmann Verlag, ISBN 3-7639-3468-5, pp. 133-139.
Spiro Trikaliotis, Guido Hiertz
Maschenfunk. Gemeinsamkeiten und Unterschiede von WLAN und Mesh-Netzen
c't Magazin für Computertechnik, 02/2006, pp. 198-203.
[URL]
André Herms, Georg Lukas, Svilen Ivanov
Realism in Design and Evaluation of Wireless Routing Protocols
In Proceedings of First international Workshop on Mobile Services and Personalized Environments (MSPE'06)
In this paper we consider the problem of reliable communication in wireless routing protocols. Many routing protocols for wireless networks use assumptions, that are known to be invalid in this special kind of networks. These shortcomings are not detected in the protocol evaluation, because common simulation tools are also based on these assumptions. In this paper we present a more realistic simulation model and a simple way of enabling existing protocols to handle real conditions of wireless propagation. A proof-of-concept implementation is presented and evaluated using simulation and measurements in a real and emulated network.
@inproceedings{cite:awds06,
  author = {Andr{\'e} Herms and Georg Lukas and Svilen Ivanov},
  title = {Realism in Design and Evaluation of Wireless Routing Protocols},
  booktitle = {Proceedings of First international Workshop on Mobile Services and Personalized Environments (MSPE'06)},
  address = {Aachen, Germany},
  year = {2006},
  month = {November},
  volume = {P-102},
  pages = {57--70},
  url = {http://ivs.cs.uni-magdeburg.de/EuK/forschung/publikationen/pdf/2006/awds-mspe.pdf}
}
Manuela Kanneberg, Edgar Nett
Roboterwettbewerbe als Benchmark für mechatronische Systeme
4. Internationale Maschinenbaukonferenz COMEC 2006, 7.-9.11.2006, Santa Clara, Cuba
Spiro Trikaliotis, Jörg Diederich
Utilizing a Fault-Tolerance Protocol for Colocation Interfering Cells in a Wireless Network
In Workshop Proceedings 19th International Conference on Architecture of Computing Systems (ARCS 2006),
16. März 2006, Frankfurt am Main, ISBN 3-88579-175-7, S. 106-115

2005

Schemmer, S. and E. Nett
Achieving Reliable and Timely Task Execution in Mobile Embedded Applications
Int. Journal of Computer System Science and Engineering, 2005
[PDF]
Daniel Mahrenholz, Svilen Ivanov
Adjusting the ns-2 Emulation Mode to a Live Network
KiVS'05, Kaiserslautern Germany, 28.02. - 03.03.2005.
[PS]
C. Tres, E. Nett, L. Buss Becker
Controlling Real-Rime Tasks Schedule Using the Value Parameter
Proc. 8th Brazilian Workshop on Real-Time Systems (WTR 2006), Curituba, Brasilien, Juni 2006
M. Kanneberg, K. Vosseberg
Experimentierworkshop: Frauen erobern Roboter
in Frauenarbeit und Informatik 30, November 2005, S. 41-42, ISSN 0944-0925
[PDF]
André Herms, Daniel Mahrenholz
GEA: A Method for Implementing and Testing of Event-driven Protocols
MeshNets 2005, 10. Juli 2005, Visegrad/Budapest, Hungary
[PDF]
E. Nett, M. Kanneberg
Kooperative Roboter im studentischen Softwarepraktikum
35. Jahrestagung der Gesellschaft für Informatik e.V.(GI); 19.-22.September in Bonn, Germany; Informatik 2005 - Informatik LIVE Band 1 S. 153 ISBN: 3-88579-396-2
Kooperative Roboter im studentischen Softwarepraktikum.pdf © by Gesellschaft für Informatik e.V. (GI), Bonn 2005
M. Kanneberg, E. Nett
Roboter in der Ausbildung, Proceedings of microCAD 2005
10.-11. März 2005, Miskolc, Hungary.
Becker, L.B., E. Nett, S. Schemmer, and M. Gergeleit
Robust Scheduling in Team-Robotics
Journal of Systems and Software, 77(1), p. 3-16, 2005 (statt 2003)
Georg Lukas
Routing mit Qualitätsgarantien in mobilen Ad-Hoc-Netzen
Diplomarbeit, Universität Magdeburg, 2005.
@mastersthesis{cite:Lukas2005,
  author = {Georg Lukas},
  title = {{Routing mit Qualit\"atsgarantien in mobilen Ad-Hoc-Netzen}},
  school = {{Universit\"at Magdeburg}},
  year = {2005},
  type = {Diplomarbeit},
  url = {http://www-ivs.cs.uni-magdeburg.de/EuK/lehre/diplomarbeiten/glukas-diplom.pdf}
}
Manfred Deutscher, Marcel Katz, Sven Krüger
Sensing and Rating different Environmental States: A basic Approach exemplified on Moving in Unknown Terrain
35. Jahrestagung der Gesellschaft für Informatik (GI); 19.-22.September in Bonn, Germany; Band 2
http://www.informatik2005.de/
E. Nett, Miroslaw Malek, Neeraj Suri (Herausgeber)
Service Availability
Second International Service Availibility Symposium, ISAS 2005, Berlin, Germany, April 2005 Revised Selected Papers
ISBN : 3-540-29103-2, Springer Verlag, 211 Seiten
[URL]
E. Nett
WLAN in Automation - More Than an Academic Excercise?
Dependable Computing - Second Latin-American Symposium, LADC 2005, Salvador, Brazil, October 2005 Proceedings, (Seite 4), Springer Verlag
[URL]

2004

Nett, E. and Schemmer, S.
A Middleware Architecture to Support Cooperating Mobile Embedded Systems in Proceedings of Workshop on Dependable Embedded Syste
in conjuction with 23rd International Symposium on Reliable Distibuted Systems.
Oct. 17, 2004, Florianopolis, Brazil.
Nett, E. and Schemmer, S.
An Architecture to Support Cooperating Mobile Embedded Systems
In Proc. 2004 ACM Computing Frontiers Conference, April 14. - 17. 2004, Ischia, Italy.
Spiro Trikaliotis
Drängler im WLAN. Bandbreitenklau in Funknetzen
Heise Security (online), 30.08.2004, http://www.heise.de/security/artikel/49366, August 30, 2004, Magdeburg, Germany
Bade, R. and Deutscher-Tiemann, M. and Herms, A.
Flexible Handling of System Software for Mobile Robots by using a Module Loader Concept
In Proceedings of Mechatronics & Robotics 2004. September 13 - 15, 2004. Aachen, Germany
http://www.informatik2004.de/
M. Deutscher, M. Katz, S. Krüger, M. Bajbouj
Learning about the environment by analyzing acoustic information
How to achieve predictability in unknown environments? (Part II) in Proceedings of CLAWAR 2004. 7th International Conference on Climbing and Walking Robots, Sept. 22-24, 2004, Madrid, Spain.
http://www.springer.com/sgw/cda/frontpage/0,11855,1-40106-22-50807816-0,00.html?changeHeader=true
Bade, R. and Ihme, T.
Method for hierarchical stereo vision for spatial environment modelling supported by motion information
In Proceedings of Robotik 2004. VDI-Verlag, June 17 - 18, 2004. Munich, Germany
Bade, R. and Herms, A. and Ihme T.
Motion Planning for a Legged Vehicle Based on Optical Sensor Information.
In Proceedings of CLAWAR 2004. 7th International Conference on Climbing and Walking Robots, September 22 - 24, 2004, Madrid, Spain
Daniel Mahrenholz, Svilen Ivanov
Real-Time Network Emulation with ns-2
Proceedings of The 8-th IEEE International Symposium on Distributed Simulation and Real Time Applications,
Budapest Hungary, October 21-23, 2004.
[PS]
M. Kanneberg, E. Nett
Roboter in der Ausbildung
III. Internationale Maschinenbaukonferenz COMEC 2004,
9.-11.11.2004, Santa Clara, Cuba
Becker, L.B., E. Nett, S. Schemmer, and M. Gergeleit
Robust Scheduling in Team-Robotics
Journal of Systems and Software
[PDF]
Spiro Trikaliotis
Utilizing Fault-Tolerance for Achieving QoS in Ad-hoc Networks
Workshop Proceedings "Dependability and Fault-Tolerance", Organic and Pervasive Computing, International Conference on Architecture of Computing Systems (ARCS 2004), Augsburg, Germany, March 23-26, 2004, pp. 66-75.
Spiro Trikaliotis
WLAN-Feinschliff. Schnelleres Funknetz mit stabilerem Durchsatz
c't Magazin für Computertechni, 06/2004, pp. 216-221.
[URL]

2003

Schemmer, S. and E. Nett
Achieving Reliable and Timely Task Execution in Mobile Embedded Applications
In Proc. 9th IEEE International Workshop on Object-oriented Real-time Dependable Systems (WORDS 2003F),
Capri Island,Italy. October 1-3, 2003
[PDF]
M.A. Deutscher, Th. Ihme
How to Achieve Predictability in Unknown Environments? An Interdisciplinary Sensor Based Approach for Walking Robots
6th International Conference on Climbing and Walking Robots And the Support Technologies for Mobile Machines (CLAWAR 2003). September 17-19, Catania, Italy
http://www.pepublishing.com/frm_site.htm
T. Ihme
Körperbewegungen und verteilte Kraftmessung zur Ausführung von technischen Operationen mit Laufrobotern
6. Magdeburger Maschinenbau-Tage: Intelligente technische Systeme und Prozesse, 24. - 26. September 2003, Magdeburg, Deutschland
Schemmer, S. and E. Nett
Managing Dynamic Groups of Mobile Systems
In Proc. 6th International Symposium on Autonomous Decentralized Systems, Pisa, Italy. April 9-11, 2003
[PDF]
T. Ihme
Posture Control and Distributed Force Sensing for Technical Applications of Walking Robots
The 11th International Conference on Advanced Robotics (ICAR 2003), June 30 - July 3, 2003, Coimbra, Portugal
Nett, E. and S. Schemmer
Realizing Virtual Sensors by Distributed Multi-Level Sensor Fusion
In Proc. 2003 International Workshop on Multi-Robot Systems, Washington, D.C, Kluwever Academic Publishers. March 17-19, 2003
Nett, E. and S. Schemmer
Reliable Real-Time Communication in Cooperative Mobile Applications
IEEE Transactions on Computers 52(2):166-180. Feb. 2003
[PDF]
M. Gergeleit, L. Buss Becker, E. Nett
Robust Scheduling in Team-Robotics
11th International Workshop on Parallel and Distributed Real-Time Systems (WPDRTS 2003), in conjunction with IPDPS 2003, April 22-24, 2003, Nizza, Frankreich
M. Deutscher, T. Ihme
Safety by a Sensor-Based Timely Perception: An Interdisciplinary Approach for Walking Robots
Teiltagung Sicherheit - Schutz und Zuverlässigkeit der 33. Jahrestagung der Gesellschaft für Informatik (Informatik 2003), 29. September - 2. Oktober 2003, Frankfurt a.M., Deutschland
Becker, L. B., M.Gergeleit, S. Schemmer, and E. Nett
Using a Flexible Real-Time Scheduling Strategy in a Distributed Embedded Application
In Proc. 9th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA), Lisbon, Portugal. September 16-19, 2003
[PDF]
Spiro Trikaliotis
Vorfahrt für die Schnellen. Sendezeitzuteilung bei WLANs und ihre ererbten Probleme
c't Magazin für Computertechnik, 18/2003, pp. 208-213.
[URL]

2002

E. Nett, M. Mock
A Recovery Model for Cooperative Computations
June 2002, Kapitel im Buch: Concurrency in Dependable Computing von Paul Ezhilchelvan, Alexander Romanovsky; Kluwer Academic Publishers, Bosten Hardbound, ISBN 1-4020-7043-8, S. 328 pp.
Martin Gergeleit
Blauzahn stört WLAN-Kreise
Computerwoche extra 2/2002 - Netze und mobile Dienste, März 2002, ISSN 0935-1310, Computerverlag GmbH, München 2002
E. Nett, M. Gergeleit, M. Mock
Drahtlose Netze für Buisiness-Anwendungen
Buchtitel im Jahrbuch 2002 Datenkommunikation, H. Roessel, Hrsg., Addison-Welsey, 2001, S. 237-278
M. Kanneberg
Faszination Roboter, Broschüre der Otto-von-Guericke-Universität Magdeburg
Faszination Wissenschaft im Allee-Center und Forschungswoche 2002
M. Gergeleit u. R. Schumann
Gruppenkommunikation ohne Lücken - Funk-WLAN und Echtzeit
IEE - Automatisierung + Datentechnik, 47. Jahrgang 2002, Nr. S1, Hüthig Verlag
S. Schemmer, T. Ihme, E. Nett
Kollisionsvermeidung durch Planung in räumlich definierten, dynamischen Robotergruppen
Robotik 2002 - Leistungsstand-Anwendungen-Visionen-Trends, Tagung Ludwigsburg, 19. bis 20. Juni 2002. In Reihe: VDI-Berichte, Bd. 1679, VDI/VDE-Gesellschaft Mess- und Automatisierungstechnik. Düsseldorf: VDI-Verl., 2002, S. 153-158. ISBN 3-18-091679-6
[PDF]
T. Ihme
Laufroboter - unsere Helfer von morgen?
Broschüre der Otto-von-Guericke-Universität Magdeburg, Faszination Wissenschaft im Allee-Center und Forschungswoche 2002
S. Trikaliotis
Performanz eines fehlertoleranten WLAN-Gruppenkommunikationsprotokolls bei Störungen durch Bluetooth
Proc. ARCS 2002, Karlsruhe, Germany, 08.-12.04.2002, ISBN 3-8007-2686-6
E. Nett
Rechnerunterstützte Kooperation von autonomen mobilen Systemen
Magdeburger Wissenschaftsjournal, Otto-von-Guericke-Universität Magdeburg, Ausgabe 1/02, ISSN 0949-5304
Ihme, T.
Steuerung von sechsbeinigen Laufrobotern unter dem Aspekt technischer Anwendungen
Dissertation. Magdeburg, 2002
Martin Gergeleit, Ralf Schumann
Techniken für den Einsatz von IEEE 802.11 (WLAN) unter Echtzeitbedingungen
SPS/IPC/Drives Kongress, Nürnberg, 26.-28. Nov. 2002
Nett, E., S. Schemmer, and M. Gergeleit
Verlustraten im WLAN - Messungen beim RoboCup
Proc. Informatik 2002, Dortmund, Germany, 30.09.-03.10.2002
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2001

L. B. Becker, M. Gergeleit, E. Nett, C. E. Pereira
An Integrated Environment for the Complete Development Cycle of an Object-Oriented Distributed Real-Time System
International Journal of Computer Systems Science & Engineering, Vol 16 No 2 March 2001, Special issue: ISORC '99, ISSN 0267 6192
[URL]
L. B. Becker, M. Gergeleit, E. Nett
Approach for Implementing Object-Oriented Real-Time Models on Top of Embedded Targets
OMER-2 - Workshop on Object-oriented Modeling of Embedded Real-time Systems, Herrsching am Ammersee, Germany, May 10-12, 2001
Michael Mock, Stefan Schemmer, Edgar Nett
Bewertung eines Echtzeit-Protokolls zur Gruppenkommunikation auf WavelLAN und Windows NT
GMA-Kongress 2001 "Automatisierungstechnik im Spannungsfeld neuer Technologien" der VDI/VDE-Gesellschaft Mess- und Automatierungstechnik, Baden-Baden, 22./23.Mai 2001
Edgar Nett, Michael Mock, Martin Gergeleit
Das drahtlose Ethernet; Der IEEE 802.11-Standard: Grundlagen und Anwendung
Buch, erschienen bei Addison-Wesley, Februar 2001, ISBN 3-8273-1741-X, 272 Seiten
[URL]
Eichen, R., Kanneberg, M., Meyer zur Heyde, M. und Müllerburg, M.
Der AROBIKS Workshop: Ziel, Ablauf und Ergebnisse
In Abiturientinnen mit Robotern und Informatik ins Studium - AROBIKS Workshop. Müllerburg, M. (Hrsg.). GMD Report 128, S. 11-20. 2001.
Ihme, T., Deutscher, M.
Design and Control Aspects for Six-legged Walking Robots to Realize Adaptation to the Environment
In: Berns, K.; Dillmann, R. (eds.): Proceedings of the Fourth International Conference on Climbing and Walking Robots (CLAWAR 2001) - From Biology to Industrial Applications. 24-26 September 2001, Karlsruhe, Germany. Professional Engineering Publishing, Bury St Edmunds (u.a.), UK, 2001. pp. 627-634. ISBN 1-86058-265-2
http://www.pepublishing.com/frm_site.htm
M. Mock, E. Nett, S. Schemmer
Drahtloses LAN im Feld: Lösungsansätze auf der Basis von IEEE 802.11
Automatisierungstechnische Praxis (atp), Ausgabe 9/2001, Oldenbourg Verlag
E. Nett, M. Gergeleit, and M. Mock
Enhancing O-O Middleware to become Time-Aware
Special Issue on Real-Time Middleware in Real-Time Systems, 20 (2): 211-228, March2001, Kluwer Academic Publishers. ISSN- 0922-6443
[URL]
Kanneberg, M.
Erfahrungen mit dem LEGO Mindstorms Robotic Invention System (RIS) im studentischen Softwarepraktikum und mit Schülerinnen aus G
In Abiturientinnen mit Robotern und Informatik ins Studium - AROBIKS Workshop. Müllerburg, M. (Hrsg.). GMD Report 128, S. 11-20. 2001.
L. B. Becker, M. Gergeleit
Execution Environment for Dynamically Scheduling Real-Time Tasks
22nd IEEE Real-Time Systems Symposium (RTSS 2001), WIP-Session, London, Dec. 3-6, 200
[PDF]
Edgar Nett, Martin Gergeleit, Michael Mock
Mechanisms for a Reliable Cooperation of Vehicles
in Proceedings of the Sixth International Symposium on High Assurance Systems Engineering (HASE 2001), Boca Ration, Florida, Oct. 2001
M. Gergeleit, E. Nett, S. Trikaliotis
Messung der gegenseitigen Störungen von Funk-Netzwerken
Die Jahrestagung der GI in Wien: Informatik 2001, 25. bis 28. September 2001
Gergeleit, M., Kanneberg, M.
Mindstorms Tournament-A Hands-on Introduction to Cooperative Robotics
In Proceedings of the Workshop on Edutainment Robots 2000.GMD Report 129, S. 13-14.2001
Stefan Schemmer, Edgar Nett, Michael Mock
Reliable Real-Time Cooperation of Mobile Autonomous Systems
In Proceedings 20th Symposium on Realiable Distributed Systems (SRDS 2001), October 28-31, 2001, S. 238 - 246, ISBN 0-7695-1366-2
[PDF]

2000

M. Mock, R. Frings, E. Nett, S. Trikaliotis
Clock Synchronization for Wireless Local Area Networks
12th Euromicro Conference on Real-Time Systems, Stockholm, June 2000.
Mock, M., Frings, R., Nett, E., Trikaliotis, S.
Continuous Clock Synchronization in Wireless Real-Time Applications
19th IEEE Symposium on Reliable Distributed Systems (SRDS), Nürnberg, Germany, October 16-18, 2000.
[PDF]
Mock, M., Schemmer, S., and Nett, E.
Evaluating a Wireless Real-Time Communication Protocol on Windows NT and WaveLAN
In Proceedings of WFCS'2000 3rd IEEE International Workshop on Factory Communication Systems, Porto, Portugal, September, 2000
[PDF]
M. Mock and E. Nett
Integrating Hard and Soft Real-Time Communication in Autonomous Robot System
Special Issue on Autonomous Decentralized Systems of the IEICE Transactions on Communications, Vol. E83-B, No. 5, pp. 1067-1074, 2000.
Ihme, T.
Kombination von Schreitzyklen und Körperbewegung bei einem sechsbeinigen Laufroboter
Robotik 2000: Leistungsstand - Anwendungen - Visionen - Trends; Tagung Berlin, 29. und 30. Juni 2000. Fachtagung Robotik 2000. Düsseldorf: VDI-Verl., 2000, S. 515-522.
M. Mock, M. Gergeleit, E. Nett
Monitoring Distributed Real-Time Activities in DCOM
3nd IEEE International Symposium on Object-oriented Real-time distributed Computing (ISORC'2K), Newport Beach, Ca., USA, March 15-17, 2000
[PDF]
M. Mock and E. Nett
On the coordination of Autonomous Systems
5th IEEE International Workshop on Object-Oriented Real-Time Dependable Systems, Monterey, 1999 (proceedings published in 2000).
[PDF]
Ihme, T.
Realisierung eines verteilten Steuerungssystems für einen Laufroboter
In: Ch. Döschner (Hrsg.): Verteilte Automatisierung - Modelle und Methoden für Entwurf, En-gineering und Instrumentierung. Magdeburg, 22. bis 23. März 2000. Fachtagung 2000.
[PDF]
Sandrini, F., Di Giandomenico F., Bondavalli, A., Nett, E.
Scheduling Solutions for the Integrated Tolerance to Value and Timing Faults
3nd IEEE International Symposium on Object-oriented Real-time distributed Computing (ISORC'2K), Newport Beach, Ca., USA, March 15-17, 2000.

1999

Michael Mock, Reiner Frings, Edgar Nett
An Approach to Fault Tolerant Clock Synchronization for Wireless Local Area Networks
Proceedings of the 15. GI/ITG-Fachtagung ARCS'99: Architektur von Rechnersystemen, Jena, Oct 4.-7., 1999, Seiten 61-67, Druck: Universität Jena, ISSN 0949-3042
[PDF]
L. B. Becker, M. Gergeleit, E. Nett, C. E. Pereira
An Integrated Environment for the Complete Development Cycle of an Object-Oriented Distributed Real-Time System
2nd IEEE International Symposium on Object-oriented Real-time distributed Computing (ISORC'99), Saint-Malo, France, May 2 - 5, 1999, Seiten 165-171, ISBN 0-7695-0207-5
[URL]
M. Mock, E. Nett, S. Schemmer
Efficient Reliable Real-Time Group Communication for Wireless Local Area Networks
Third European Dependable Computing Conference EDCC-3, Prague, Czech Republic, Sep. 15-17, 1999, Seiten 380-397, ISBN 3-540-66483-1, Springer
[PDF]
Martin Gergeleit and Edgar Nett
JewelNT: Monitoring of Distributed Real-Time Application on Windows NT
Proceedings of the 3rd Annual IASTED International Conference on Software Engineering and Applications (SEA'99), Scottsdale, Arizona, USA, October 6-8, 1999, pp. 325-328, ISBN 0-88986-273-7
[PDF]
Martin Gergeleit
JRPC: Connecting Java Applications with Legacy ONC RPC Servers
(Slides), Informatik Aktuell, Springer, Tagungsband der JIT'99 - Java-Informations-Tage 1999, Düsseldorf, 20. 9. - 21. 9. 1999, Seiten 149 - 160, ISBN 3-540-66464-5
Martin Gergeleit, Edgar Nett, Jörg Fitzner
On-line Prediction of Execution Times - A Basis for Adaptive Scheduling
Fourth International Workshop on Object-oriented Real-time Dependable Systems, Santa Barbara, California, February 1999, ISBN 0-7695-0101-X, Seiten 186 - 194
[URL]
Michael Mock, Edgar Nett
Real-Time Communication in Autonomous Robot Systems
The Fourth International Symposium on Autonomous Decentralized Systems (ISADS'99), Tokyo, Japan, March 21-23, 1999, Seiten 34 - 41, ISBN 0-7695-0137-0
[PDF]
Edgar Nett
Windows CE and Real Time - More than a Marketing Message?
Seminário Nacional de Controle e Automação, Industrial, Elétrica e de Telecomunicações, Salvador, Brasilien, Nov. 10 - 12, 1999