Campusleben_HAW_Hamburg_15

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Studierende_HAW_Hamburg_15

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Publikationen von Professorinnen und Professoren der HAW Hamburg

Jahr:  
Alle : 1982, ... , 2009, 2010, 2011, ... , 2020
Autor:  
Alle : A, À, B, C, D, E, F, G, H, I, J, K, L, M, N, O, Ö, P, Q, R, S, T, U, V, W, Y, Z 
Alle : W. Biersack, ... , Wetzel, Weyand, Weyhe, ... , Wöste 
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Referenzen

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

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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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Alexander Knauf, Gabriel Hege, Thomas C. Schmidt und Matthias Wählisch
A Virtual and Distributed Control Layer with Proximity Awareness for Group Conferencing in P2PSIP
Proc. of IPTComm 2010 aus Digital Library , Seite 122--133.
Verlag: ACM, New York

Marker: TI-I

Zusammenfassung: There is an increasing demand to access voice or video group conferences without the burden of a dedicated infrastructure, but at any place and in an ad hoc fashion. Corresponding solutions require a lightweight, fully distributed cooperation among parties that share and manage the conference in an efficient, self-adaptive way. The technology framework of P2PSIP can be seen as a promising starting point to meet these objectives. In this paper, we make several contributions towards such a distributed, virtualized control layer based on P2PSIP that seamlessly scales and adapts to the user needs. We propose a P2P-signaling protocol scheme for a distributed conference control with SIP, that splits the semantic of Identifier and Locator of a SIP conference URI in a standard-compliant manner. This protocol scheme serves as further basis for a virtualization in RELOAD. We further design and evaluate a self-organizing communication layer that provides load sharing and churn resilience with proximity-awareness. Finally, we address key aspects of security and trust, as well as compatibility for conference unaware clients.

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Thomas C. Schmidt und Matthias Wählisch
System-level Service Assurance -- The HAMcast Approach to Global Multicast
Proc. of 6th TridentCom Band 46 aus LNICST , Seite 635--639.
Verlag: Springer-Verlag, Berlin Heidelberg

Marker: TI-I

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Matthias Wählisch und Thomas C. Schmidt
Hybrid Adaptive Mobile Multicast -- The HAMcast Approach of Unified Access to Future Services
Jean-Paul Le Guigner und others (Hrsg.) Proceedings of the TERENA Networking Conference (TNC 2010)
Verlag: TERENA, Amsterdam

Marker: TI-I

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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.

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Maik Wodarz, James P. Taisie und Thomas C. Schmidt
QoS Performance Study of One Way Link Characteristics in an IEEE 802.16d TDD System
Proceedings of the 6th Advanced International Conference on Telecommunications (AICT 2010) , Seite 241--246.
Verlag: IEEE Computer Society,

Marker: TI-I

Zusammenfassung: WiMAX systems are beginning to spread as a wide-area wireless access technology that provides QoS support for future multimedia applications. Vendors have started to ship off-the-shelf hardware that addresses the market of broadband Internet coverage in sparsely populated areas. Facing a potentially large deployment of 802.16-based end-system connectivity, it is of vital interest to experimentally evaluate the capabilities of WiMAX systems in real-world setups. The main objective of our current paper is to quantify QoS performance of the one way wireless service flows in a 3.5 GHz band carrier utilizing the time division duplexing mode of the IEEE802.16 standard. We evaluate performance dependencies of the time division duplexing system on modulation and load, and show that the link latency is asymmetric.

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Thomas C. Schmidt und Matthias Wählisch
The Character of G-LAB -- An Analysis of the German Lab for Future Internet Research and its Opportunities for Experimentally Driven Service Development
Jean-Paul Le Guigner und others (Hrsg.) Proceedings of the TERENA Networking Conference (TNC 2010)
Verlag: TERENA, Amsterdam

Marker: TI-I

Buchbeiträge:

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Birgit Menzel und Jan Wehrheim
Soziologie sozialer Kontrolle
Georg Kneer; Markus Schroer (Hrsg.) Handbuch Spezielle Soziologien
Seite 509-524.
Verlag: VS, Wiesbaden
2010

Marker: WS-PuMa

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Matthias Wählisch
Modeling the Network Topology
Klaus Wehrle, Mesut Günes und James Gross (Hrsg.) Modeling and Tools for Network Simulation
Seite 471--486.
Verlag: Springer, Heidelberg
2010
ISBN: 978-3-642-12330-6

Marker: TI-I

Seite:  
Zurück | 1, 2, 3, 4, 5, 6 | Weiter
Total:
1016
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Letzte Änderung: 23.01.15

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