Campusleben_HAW_Hamburg_13

Lehrende_HAW_Hamburg_8

Studierende_HAW_Hamburg_13

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Publikationen von Professorinnen und Professoren der HAW Hamburg

Jahr:  
Alle : 1982, ... , 2007, 2008, 2009, ... , 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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P. Jenke, M. Wand und W. Straßer
Patch-Graph Reconstruction for Piecewise Smooth Surfaces
Proceedings Vision, Modeling and Visualization (VMV '08)
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M. Germer, Marcus Wolff, H. Harde und Hinrich Groninga
Photoakustische NO-Detektion mittels gepulstem Quantenkaskadenlaser
Darmstadt/Germany
Verhandlungen der DPG Band 43 aus VI

Marker: TI-MP

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Thomas C. Schmidt, Olaf Christ und Matthias Wählisch
Autonome Zertifizierung mobiler Multicast-Sender -- AuthoCast --
Endausscheidung für den Deutschen IT Sicherheitspreis 2008
Horst Görtz Stiftung
FhI SIT Darmstadt

Marker: TI-I

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Thomas C. Schmidt, Matthias Wählisch und Olaf Christ
AuthoCast --- A Protocol for Mobile Multicast Sender Authentication
David Taniar Gabriele Kotsis und Ismail Khalil (Hrsg.) MoMM 2008 - 6th International Conference on Advances in Mobile Computing & Multimedia , Seite 142--149.
ACM
Verlag: ACM, Linz, AU

Marker: TI-I

Zusammenfassung: Mobility is considered a key technology of the next generation Internet and has been standardized within the IETF. Rapidly emerging multimedia group applications such as IPTV, MMORPGs and video conferencing increase the demand for mobile group communication, but a standard design of mobile multicast is still awaited. The open problem poses significant operational and security challenges to the Internet infrastructure. This paper introduces a protocol framework for securing mobility handovers of multicast sources. Using an autonomously verifiable, one-way authentication based on cryptographically generated addresses, a common design is derived to jointly comply with the mobile any source and source specific multicast protocols that are currently proposed. This light-weight scheme smoothly extends the unicast enhanced route optimization for mobile IPv6 and adds only little overhead to multicast packets and protocol operations.

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Thomas C. Schmidt, Matthias Wählisch und Maik Wodarz
ETM - An Optimized Routing Protocol for Mobile SSM Sources
Zoubir Mammeri (Hrsg.) Wireless and Mobile Networking. 10th IFIP Intern. Conf. on Mobile and Wireless Communications Networks (MWCN 2008) Band 284 aus IFIP International Federation for Information Processing , Seite 29--40.
Verlag: Springer Verlag, Boston

Marker: TI-I

Zusammenfassung: Mobility is considered a key technology of the next generation Internet and has been standardized within the IETF. Rapidly emerging multimedia group applications such as IPTV, MMORPGs and video conferencing increase the demand for mobile group communication, but a standard design of mobile multicast is still awaited. The traditional Internet approach of Any Source Multicast (ASM) routing remains hesitant to spread beyond walled gardens, while the simpler and more selective Source Specific Multicast (SSM) is expected to globally disseminate to many users and services. However, mobility support for Source Specific Multicast is still known to be a major open problem. In this paper we introduce the Enhanced Tree Morphing (ETM), an optimized multicast routing protocol for transforming (morphing) source specific distribution trees into optimal trees rooted at a relocated source. Following up on previous results for the initial Tree Morphing, we present enhancements that lead to a simpler protocol with significantly optimized performance values in both, forwarding performance and protocol robustness. Extensive evaluations based on real-world topology data are part of this work.

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Hans L. Cycon, Thomas C. Schmidt, Gabriel Hege, Matthias Wählisch und Mark Palkow
Let's Meet at the Mobile -- Learning Dialogs with a Video Conferencing Software for Mobile Devices
Michael E. Auer (Hrsg.) Proceedings of the International Conference Interactive Computer aided Learning ICL 2008
Verlag: Kassel University Press, Kassel

Marker: TI-I

Zusammenfassung: Mobile phones and related gadgets in networks are omnipresent at our students, advertising itself as the platform for mobile, pervasive learning. Currently, these devices rapidly open and enhance, being soon able to serve as a major platform for rich, open multimedia applications and communication. In this report we introduce a video conferencing software, which seamlessly integrates mobile with stationary users into fully distributed multi-party conversations. Following the paradigm of flexible, user-initiated group communication, we present an integrated solution, which scales well for medium-size conferences and accounts for the heterogeneous nature of mobile and stationary participants. This approach allows for a spontaneous, location independent establishment of video dialogs, which is of particular importance in interactive learning scenarios. The work is based on a highly optimized realization of a H.264 codec.

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Olaf Christ, Thomas C. Schmidt und Matthias Wählisch
Towards Seamless Handovers in SSM Source Mobility - An Evaluation of the Tree Morphing Protocol
Khalid Al-Begain und Antonio Cuevas (Hrsg.) IEEE NGMAST'08, Intern. Workshop on Future Multimedia Neworking - FMN'08 , Seite 456--461.
IEEE
Verlag: IEEE Computer Society Press, Cardiff, UK

Marker: TI-I

Zusammenfassung: Multimedia networking in the near future is expected to be dominated by group applications such as IPTV. Driven by new services, multicast at the network layer started to disseminate. Currently infotainment is expanding into the mobile world, but a standard design of mobile multicast is still awaited. In this paper, we design and discuss the Tree Morphing (TM) protocol that adaptively manages trees to support seamless handovers for Source Specific Multicast (SSM) sources. Based on a full simulator implementation, we extensively explore its performance. By employing artificial networks, as well as real-world topologies, we analyse the handover behaviour conceptually and in realistic scenarios.

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Thomas C. Schmidt und Matthias Wählisch
Mobile Group Communication - A Hybrid Perspective
8th Würzburg Workshop on IP: Joint EuroNF, ITC, and ITG Workshop on Visions of Future Generation Networks
Würzburg

Marker: TI-I

Zusammenfassung: Mobility is considered a key technology of the next generation Internet and has been standardized within the IETF. Rapidly emerging multimedia group applications such as IPTV, MMORPGs and video conferencing increase the demand for mobile group communication, but a standard design of mobile multicast is still awaited. The open problem poses significant operational and security challenges to the Internet infrastructure, since IP multicast routing, when adapting its distribution trees to moving listeners or senders, needs to newly established forwarding states. The latter requires a homogeneous and coherent availability of multicast routing in all visited networks. Multicast communication services are one of the longest debated issues in the 30 years history of the Internet. Disagreement over innumerous approaches and solutions to the IP host group model has led to a strongly divergent state of deployment. Stimulated by the need of applications, alternative multicast mechanisms have been developed. P2P technologies have enabled group distribution on the application or service middleware layer, which can be transparently delpoyed with respect to the network layer. In this contribution we will discuss problems, proposals and possible solutions for establishing a mobility-agnostic group communication layer. Agent-based architectures are introduced that facilitate seamless multicast handovers for listeners and sources. The Hy- brid Shared Tree multicast approach is outlined to support a mobility-agnostic integration of interdomain multicast routing on the overlay. Cryptographic authentication of mobile multicast sources complets this work.

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Hans L. Cycon, Thomas C. Schmidt, Gabriel Hege, Matthias Wählisch, Detlev Marpe und Mark Palkow
Peer-to-Peer Videoconferencing with H.264 Software Codec for Mobiles
Ramesh Jain und Mohan Kumar (Hrsg.) WoWMoM08 -- The 9th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks -- Workshop on Mobile Video Delivery (MoViD) , Seite 1--6.
IEEE
Verlag: IEEE Press, Piscataway, NJ, USA

Marker: TI-I

Zusammenfassung: A rapidly growing number of carriers offer wireless video services to their customers, taking advantage of high quality video codecs implemented in dedicated hardware of selected mobile devices. In this paper we introduce a video conferencing \em software, which seamlessly integrates mobile with stationary users in a provider and device independent fashion. Innovations of this work are twofold. At first we report on a mobile realization of an H.264 video codec and its performance on a standard consumer Smartphone. Operating within the tight bounds of real-time compliance on mobiles, this software is an adapted version of a highly optimized H.264 codec. This DAVC codec, which we introduce along the line, significantly outperforms compatible H.264 realizations and allows for a scalable adaptation of its frame rate. In the second part we present a barrier-resistant peer-to-peer group communication scheme, which scales well for medium-size conferences and accounts for the heterogeneous nature of mobile and stationary participants. An outlook on mobility related group communication issues and future optimizations based on structured communication layers concludes the work.

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Hans L. Cycon, Thomas C. Schmidt, Gabriel Hege, Matthias Wählisch und Mark Palkow
An optimized H.264-based Video Conferencing Software for Mobile Devices
Antonio Navarro (Hrsg.) ISCE2008 -- The 12th IEEE International Symposium on Consumer Electronics , Seite 1--4.
IEEE
Verlag: IEEE Press, Piscataway, NJ, USA

Marker: TI-I

Zusammenfassung: Mobile phones and related gadgets in networks are on the spot to deliver sufficient performance for rich multimedia applications and communication. In this report we introduce a video conferencing software, which seamlessly integrates mobile with stationary users into fully distributed multi-party conversations. Innovations related to this work are twofold. At first we report on a highly optimized realisation of a H.264 codec and our implementation experiences of the video conference \em software on a consumer mobile. Within the tight bounds of real-time requirements on mobiles, the coding software outperforms compatible H.264 realizations. At second we present an integrated peer-to-peer group communication solution, which scales well for medium-size conferences and accounts for the heterogeneous nature of mobile and stationary participants.

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Letzte Änderung: 23.01.15

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