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Publikationen von Professorinnen und Professoren der HAW Hamburg

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Konferenz, Symposium, Vortragsreihe, Einzelausstellung, Modenschau, Künstl. Leitung (als Ausrichter):

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Franziska Mannke und Kathrin Rath
Reducing vulnerability to climate change and global market developments. Capacity building and knowledge transfer for smallholder farmers in SIDS as one means to adapt to a changing environment – the case of St Lucia
CLIMATE 2009

Marker: FTZ- ALS

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F. Türckheim, T. Smit und Robert Mores
String Instrument Body Modeling Using FIR Filter Design and Autoregressive Parameter Estimation
Proc. Conf. on Digital Audio Effects (DAFX-10)
Graz, Austria

Marker: DMI-Mt

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F. Türckheim, T. Smit und Robert Mores
The Semi-Virtual Violin - A Perception Tool
Proc. 20th Int. Congress on Acoustics (ICA-10)
Sidney, Australia

Marker: DMI-Mt

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Matthias Wählisch, Thomas C. Schmidt, Sebastian Meiling, Markus de Brün und Thomas Häberlen
Towards a Nation-Centric Understanding of the Internet
Proc. of the ACM SIGCOMM CoNEXT. Student Workshop
Verlag: ACM, New York

Marker: TI-I

Zusammenfassung: Data communication in the Internet is based on the borderless interplay of Autonomous Systems (ASes). An AS abstracts one or multiple IP networks, which may be globally distributed, but is owned by an organization located in a country. Current research on the Internet structure mainly focuses on a global perspective or considers local, intra-domain properties. In this paper, we analyze nation-centric subsets of the Internet taken from the AS-level graph of Germany. Each subset reflects a public or industrial sector. Based on a classified set of relevant German ASes, we are able to perform detailed investigations of structural dependencies for the critical Internet infrastructure. We identify and visualize the importance of dedicated ASes within specific sectors, and quantify robustness of the communication communities. Our preliminary results indicate that members of sectoral groups tend to ovoid direct peering, but connect via a small group of common ISPs. This results in an enhanced dependence (betweenness) on selected hubs as compared to the characteristics of larger networks.

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Matthias Wählisch, Sebastian Meiling und Thomas C. Schmidt
A Framework for Nation-Centric Classification and Observation of the Internet
Proc. of the ACM SIGCOMM CoNEXT. Student Workshop
Verlag: ACM, New York

Marker: TI-I

Zusammenfassung: The Internet has matured to a mission-critical infrastructure, and recently attracted much attention at political and legal levels in many countries. Civil actions regarding the Internet infrastructure require a thorough understanding of the national components of the global Internet to foresee possible impacts of regulations and operations at a country-level. In this paper we report on a methodology, tool chain and results for identifying and classifying a 'national Internet'. We argue for the importance to consider individual IP-blocks and quantify the effects of our proposed approach. The methods have been applied to identify a 'German Internet', but are designed general enough to work for most countries, as well.

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Sebastian Meiling, Dominik Charousset, Thomas C. Schmidt und Matthias Wählisch
System-assisted Service Evolution for a Future Internet -- The HAMcast Approach to Pervasive Multicast
Proc. of IEEE GLOBECOM 2010, Workshop MCS 2010 , Seite 913-917.
Verlag: IEEE Press, Piscataway, NJ, USA

Marker: TI-I

Zusammenfassung: The Internet has been successful in providing a uniformly available IPv4 unicast service, accessible via the socket API which eased application deployment. However, this tightly shaped concept failed to promote a heterogeneous network layer (including IPv6) or additional services like multicast. In this paper, we propose methods for diversifying the Internet service capabilities with the help of enhanced end system intelligence and an API abstraction towards the applications. We provide a general architecture for the example of hybrid adaptive mobile multicast (HAMcast) which allows for various realizations and pluralistic deployments. The achievement of our contribution is a universal, robust service access that allows group applications to run everywhere, no matter what the status of regional technological deployment will be.

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Matthias Wählisch, Thomas C. Schmidt und Sebastian Meiling
On Naming, Addressing, and Programming in Multicast
10th Würzburg Workshop on IP: Joint EuroNF, ITC, and ITG Workshop on Visions of Future Generation Networks (EuroView2010)
Würzburg

Marker: TI-I

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Hans L. Cycon, Gabriel Hege, Detlev Marpe, Mark Palkow, Thomas C. Schmidt und Matthias Wählisch
Adaptive Temporal Scalability of H.264-compliant Video Conferencing in Heterogeneous Mobile Environments
Proc. of IEEE GLOBECOM 2010 , Seite 1-5.
Verlag: IEEE Press, Piscataway, NJ, USA

Marker: TI-I

Zusammenfassung: In this paper, we present a multipoint video conferencing system that adapts to heterogeneous members including mobiles. The system is built upon a low complexity scalable extension of our H.264 codec DAVC, and a congestion-aware dynamic adaptation layer. Our temporally scaled video codec DSVC has the same RD performance as the non-scaled version with comparable configuration. We achieve this by QP cascading, i.e., assigning gradually refining quantization parameters to the declining temporal layers. We present and analyse a mobile-compliant version of DSVC at reduced complexity that still admits comparable performance. Finally, we report on early work of dynamic layer tuning. Derived of delay variation measures, senders exploit scalable video layering to adapt the video transmission to varying network conditions. Initial results indicate that video performance remains close to optimal.

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Hans L. Cycon, Detlev Marpe, Thomas C. Schmidt, Matthias Wählisch und Martin Winken
Optimized Temporal Scalability for H.264 based Codecs and its Applications to Video Conferencing
ISCE2010 --- 14th International Symposium on Consumer Electronics
Verlag: IEEE Press, Piscataway, NJ, USA

Marker: TI-I

Zusammenfassung: In this paper, we describe and analyze a low complexity scalable video codec that extends our H.264-implementation DAVC. We can show that DSVC, our temporally scaled codec, attains an RD performance identical to the non-scaled version at comparable configuration. We achieve this by QP cascading, a method of assigning gradual refining quantization parameters to the declining temporal layers. The different quantization of frames does not lead to visual distinguishable quality fluctuations. This video codec is the core component of a software-based multipoint videoconference system, which works without MCU on a hybrid P2P network structure.

Buchbeiträge:

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Dirk Lewandowski, Eva Nesbach und Nina Mikley
Lokale Suchmaschinen: Evaluierung und Gestaltungsempfehlungen
J.; Schmidt Ziegler (Hrsg.) Mensch & Computer 2010
Seite 73-82.
Verlag: Oldenbourg Verlag, München
2010

Marker: DMI- Information

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Letzte Änderung: 23.01.15

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