DVS

Dr.-Ing. Christof Leng

I am currently a visiting postdoctoral researcher at ICSI, Berkeley working in the area of Big Data, collaborating with the AMP Lab at UC Berkeley. I did my PhD at DVS in the area of peer-to-peer networking. My research is focused on the challenges that arise, when big data, dynamic environments, and complex interactions meet. I am active in the Gesellschaft für Informatik (German Informatics Society), currently serving as a vice president.

Current Projects & Research Interests

The BubbleStorm rendezvous search system

complex queries in peer-to-peer networks
consistency and updates with large-scale replication
scalable and robust search overlays for highly dynamic environments

DFG Research Group QuaP2P
Associated Member

The CUSP transport protocol

Large-scale network simulation for peer-to-peer networks

Massively multiplayer online gaming

Functions & Memberships

Gesellschaft für Informatik e.V.
Vice President
Speaker of the Scientific Staff Advisory Board

Association for Computing Machinery
Member

ACM SIGCOMM
Member

PlanetLab
Principal investigator for TU Darmstadt

Foundation for a Free Information Infrastructure
Member

Forum InformatikerInnen für Frieden und gesellschaftliche Verantwortung e.V.
Member

Informatik Spektrum
Member of the editorial board

Teaching

Summer 2012	Middleware-Lab (Peer-to-Peer Infrastructures)
Summer 2011	Middleware-Lab (Peer-to-Peer Infrastructures)
Summer 2011	Seminar: Selected Topics in P2P Research
Summer 2010	Middleware-Lab (Peer-to-Peer Infrastructures)
Summer 2009	Middleware-Lab (Peer-to-Peer Infrastructures)
Summer 2008	Middleware-Lab (Peer-to-Peer Infrastructures)
Summer 2007	Middleware-Lab (Peer-to-Peer Infrastructures)
Summer 2006	Middleware-Lab (Peer-to-Peer Infrastructures)
Summer 2006	Seminar: Open Source

Publications

I also have a Google Scholar Citations profile, an ACM Author Profile Page, and a DBLP page.

2012
All-Weather Transport Essentials Christof Leng, Wesley Terpstra, Max Lehn, Robert Rehner, Alejandro Buchmann Internet Computing, Vol. 6, No. 16, ISSN 1089-7801, IEEE, November 2012 [Journal] [BibTeX]
BubbleStorm: Replication, Updates, and Consistency in Rendezvous Information Systems (PhD Thesis) Christof Leng Technische Universität Darmstadt, Darmstadt, Germany, TU Prints, August 2012 [PDF] [BibTeX]
Distributed Search with Rendezvous Search Systems Christof Leng 7th KuVS/ITG-Fachgespräch Future Internet, Munich, Germany, January 2012 [PDF] [Slides] [BibTeX]
2011
An Online Gaming Testbed for Peer-to-Peer Architectures Max Lehn, Christof Leng, Robert Rehner, Tonio Triebel, Alejandro Buchmann Proceedings of ACM SIGCOMM'11, Toronto, Canada, ACM, August 2011 Demo [Conference] [PDF] [PS] [Slides] [BibTeX]
Designing a Testbed for Large-scale Distributed Systems Christof Leng, Max Lehn, Robert Rehner, Alejandro Buchmann Proceedings of ACM SIGCOMM'11, Toronto, Canada, ACM, August 2011 Poster [Conference] [PDF] [Slides] [BibTeX]
2010
Distributed SQL Queries with BubbleStorm Christof Leng, Wesley W. Terpstra In Kai Sachs, Ilia Petrov, Pablo Guerrero: From Active Data Management to Event-Based Systems and More, Lecture Notes in Computer Science 6462, ISBN 978-3-642-17225-0, Springer, November 2010 [PDF] [BibTeX]
Performance Evaluation of Peer-to-Peer Gaming Overlays Max Lehn, Tonio Triebel, Christof Leng, Alejandro Buchmann, Wolfgang Effelsberg IEEE International Conference on Peer-to-Peer Computing, August 2010 Demo [Conference] [PDF] [BibTeX]
Modeling User Behavior in P2P Systems Konstantin Pussep, Christof Leng, Sebastian Kaune In Klaus Wehrle, Mesut Günes, James Groß: Modeling and Tools for Network Simulation, ISBN 978-3-642-12330-6, Springer, July 2010 [PDF] [BibTeX]
Channel-based Unidirectional Stream Protocol (CUSP) Wesley W. Terpstra, Christof Leng, Max Lehn, Alejandro P. Buchmann Proceedings of the IEEE INFOCOM Mini Conference, March 2010 [Conference] [PDF] [BibTeX]
2009
Modelling the Internet Delay Space Based on Geographic Locations Sebastian Kaune, Konstantin Pussep, Aleksandra Kovacevic, Christof Leng, Gareth Tyson, Ralf Steinmetz Proceedings of the 17th Euromicro International Conference on Parallel, Distributed, and Network-Based Processing (PDP 2009), Weimar, Germany, February 2009 [Conference] [PDF] [BibTeX]
2008
Peer-to-Peer based Version Control Patrick Mukherjee, Christof Leng, Wesley W. Terpstra, Andy Schuerr Proceedings of the 2nd International Workshop on Peer-to-Peer Network Virtual Environments (P2P-NVE 2008), Melbourne, Australia, December 2008 [Conference] [BibTeX]
Towards Benchmarking of Structured Peer-to-Peer Overlays for Network Virtual Environments Aleksandra Kovacevic, Kalman Graffi, Sebastian Kaune, Christof Leng, Ralf Steinmetz Proceedings of the 2nd International Workshop on Peer-to-Peer Network Virtual Environments (P2P-NVE 2008), Melbourne, Australia, December 2008 [Conference] [BibTeX]
Maintaining Replicas in Unstructured P2P Systems Christof Leng, Wesley W. Terpstra, Bettina Kemme, Wilhelm Stannat, Alejandro P. Buchmann Proceedings of the 4th ACM International Conference on emerging Networking EXperiments and Technologies (ACM CoNEXT 2008), Madrid, Spain, December 2008 [Conference] [PDF] [BibTeX]
Impact of User Behavior Modeling on Evaluation of Peer-to-Peer Systems Konstantin Pussep, Sebastian Kaune, Christof Leng, Aleksandra Kovacevic, Ralf Steinmetz Technical Report, No. KOM-TR-2008-07, Technische Universität Darmstadt, November 2008 [PDF] [BibTeX]
Piki - A Peer-to-Peer based Wiki Engine Patrick Mukherjee, Christof Leng, Andy Schuerr Proceedings of the 8th International Conference on Peer-to-Peer Computing 2008 (P2P 2008), Aachen, Germany, September 2008 Demo [Conference] [BibTeX]
2007
Peer-to-Peer-Forschung - Überblick und Herausforderungen Kalman Graffi, Aleksandra Kovacevic, Patrick Mukherjee, Michael Benz, Christof Leng, Dirk Bradler, Julian Schröder-Bernhardi, Nicolas Liebau it - Information Technology (Methods and Applications of Informatics and Information Technology), Vol. 46, No. 3, Oldenbourg Wissenschaftsverlag, Munich, Germany, September 2007 [BibTeX]
Brief Announcement: Practical Summation via Gossip Wesley W. Terpstra, Christof Leng, Alejandro P. Buchmann Twenty-Sixth Annual ACM SIGACT-SIGOPS Symposium on Principles of Distributed Computing (PODC 2007), Portland, Oregon, USA, August 2007 [PDF] [PS] [Slides] [BibTeX]
BubbleStorm: Resilient, Probabilistic, and Exhaustive Peer-to-Peer Search Wesley W. Terpstra, Jussi Kangasharju, Christof Leng, Alejandro P. Buchmann Proceedings of the 2007 ACM SIGCOMM Conference, Kyoto, Japan, August 2007 [Conference] [PDF] [PS] [Slides] [BibTeX]
BubbleStorm: Analysis of Probabilistic Exhaustive Search in a Heterogeneous Peer-to-Peer System Wesley W. Terpstra, Christof Leng, Alejandro P. Buchmann Technical Report, No. TUD-CS-2007-2, Technische Universität Darmstadt, Fachbereich Informatik, Darmstadt, Germany, May 2007 [PDF] [BibTeX]
2006
Self-Protection in P2P Networks: Choosing the Right Neighbourhood Ivan Martinovic, Christof Leng, Frank A. Zdarsky, Andreas Mauthe, Ralf Steinmetz, Jens B. Schmitt Proceedings of the International Workshop on Self-Organizing Systems (IWSOS 2006), Passau, Germany, Springer, September 2006 [PDF] [BibTeX]

Supervised Theses

2013
ByteStorm: Faires Mehrzweck-Content-Distribution-Protokoll (MSc. Thesis) Tilo Eckert. Technische Universität Darmstadt, January 2013. German. [PDF] [BibTeX]
2012
Soziale Komponenten für BitTorrent via BubbleStorm (BSc. Thesis) Andreas Teuber. Technische Universität Darmstadt, July 2012. German. [PDF] [BibTeX]
Kontroll- und Messumgebung für Netzwerkprototypen (BSc. Thesis) Marcel Blöcher. Technische Universität Darmstadt, April 2012. German. [BibTeX]
2010
Verteilte Suche für BitTorrent-Netzwerke (BSc. Thesis) Tilo Eckert. Technische Universität Darmstadt, September 2010. German. [PDF] [BibTeX]
Analyse und Korrektur des Datenkommunikationsmodells einer zeitkontinuierlichen verteilten Anwendung mit Schwerpunkt auf Zustandskonsistenz und Fehlertoleranz (BSc. Thesis) Stefano Albrecht. Technische Universität Darmstadt, March 2010. German. [PDF] [BibTeX]
2009
Implementation of a Peer-to-Peer Multiplayer Game with Realtime Requirements (MSc. Thesis) Max Lehn. Technische Universität Darmstadt, October 2009 [PDF] [BibTeX]
Performance Comparison of DHT based Peer-to-Peer Full-Text Search Systems (Diploma Thesis) Christian J. Schwan. Technische Universität Darmstadt, September 2009 [PDF] [BibTeX]
2008
Simulation of the BubbleStorm Peer-to-Peer Network (BSc. Thesis) Dimitar Mechev. Technische Universität Darmstadt, September 2008 [PDF] [BibTeX]
Implementation of a Prototype for the BubbleStorm Peer-to-Peer Network (Diploma Thesis) Marco Swoboda. Technische Universität Darmstadt, March 2008 [PDF] [BibTeX]
Implementierung eines Peer-to-Peer Wikis (BSc. Thesis) Markus Günther. Technische Universität Darmstadt, March 2008. German. [PDF] [BibTeX]
Reputationssysteme in geclusterten Peer-to-Peer Netzwerken (Diploma Thesis) Peter Dobschal. Technische Universität Darmstadt, March 2008. German. [PDF] [BibTeX]
Peer-to-Peer Replikatverwaltung in BubbleStorm (BSc. Thesis) Paul Bächer. Technische Universität Darmstadt, March 2008. German. [PDF] [BibTeX]

Databases and Distributed Systems

A high resolution version of the picture is available under the CC-BY-SA license.

Contact

+1 510 666 2971
cleng@dvs.tu-...

International Computer Science Institute
1947 Center Street Suite 600
Berkeley, CA 94704
USA

DVS