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Publikationen von Professorinnen und Professoren der HAW Hamburg

Alle : 1982, ... , 2012, 2013, 2014, ... , 2021
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Thomas C. Schmidt, Matthias Wählisch, Dominik Charousset und Sebastian Meiling
On Name-based Group Communication: Challenges, Concepts, and Transparent Deployment
Computer Communications,

Zusammenfassung: Human-centric naming will largely facilitate access and deployment of network services in a future Internet. Information-centric networking (ICN) introduces such vision of a name-oriented, secure, globally available publish-subscribe infrastructure. Current approaches concentrate on unicast-like pull mechanisms and thereby fall short of naming and automatically updating content at groups of receivers. In this paper, we adopt the information-centric paradigm, but argue that an inclusion of multicast will grant additional benefits to the network layer. Our contribution bridges the gap between requesting content by name and applying requests to a scalable distribution infrastructure in a many-to-many communication model. We introduce a group-oriented naming concept that integrates the various available group schemes, simplifies rendezvous processes, and introduces new use cases. We present an open-source prototype of this name-oriented multicast access implemented in the HAMcast middleware.

A. Toumi, L. Chun, S. Bhosle, G. Zissis, P. Maussion, Bernd Baumann und Marcus Wolff
Acoustic Resonance Characterization and Numerical Model Including Acoustic Streaming in an HPS Lamp
IEEE Transactions on Industry Applications, 49(3):1154-1160

Marker: TI-MP

J. Ebel, S. Auer, K.L. Chen, J. Schallhorn und C. Petersen-Ewert
Pflegekurse für Angehörige in Hamburg
HeilberufeScience, 10.1007/s16024-013-0173-0

Marker: WS-PM

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

Dominik Charousset und Thomas C. Schmidt
libcppa - Designing an Actor Semantic for C++11
Proc. of C++Now

Zusammenfassung: Parallel hardware makes concurrency mandatory for efficient program execution. However, writing concurrent software is both challenging and error-prone. C++11 provides standard facilities for multiprogramming, such as atomic operations with acquire/release semantics and RAII mutex locking, but these primitives remain too low-level. Using them both correctly and efficiently still requires expert knowledge and hand-crafting. The actor model replaces implicit communication by sharing with an explicit message passing mechanism. It applies to concurrency as well as distribution, and a lightweight actor model implementation that schedules all actors in a properly pre-dimensioned thread pool can outperform equivalent thread-based applications. However, the actor model did not enter the domain of native programming languages yet besides vendor-specific island solutions. With the open source library libcppa, we want to combine the ability to build reliable and distributed systems provided by the actor model with the performance and resource-efficiency of C++11.

Dominik Charousset, Thomas C. Schmidt, Raphael Hiesgen und Matthias Wählisch
Native Actors -- A Scalable Software Platform for Distributed, Heterogeneous Environments
Proc. of the 4rd Annual Conference on Systems, Programming, and Applications (SPLASH '13), Workshop AGERE!
Verlag: ACM, New York, NY, USA

Zusammenfassung: Writing concurrent software is challenging, especially with low-level synchronization primitives such as threads or locks in shared memory environments. The actor model replaces implicit communication by an explicit message passing in a ``shared-nothing" paradigm. It applies to concurrency as well as distribution, but has not yet entered the native programming domain. This paper contributes the design of a native actor extension for C++, and the report on a software platform that implements our design for (a) concurrent, (b) distributed, and (c) heterogeneous hardware environments. GPGPU and embedded hardware components are integrated in a transparent way. Our software plattform supports the development of scalable and efficient parallel software. It includes a lock-free mailbox algorithm with pattern matching facility for message processing. Thorough performance evaluations reveal an extraordinary small memory footprint in realistic application scenarios, while runtime performance not only outperforms existing mature actor implementations, but exceeds the scaling behavior of low-level message passing libraries such as OpenMPI.

Dieter Scholz und Ricardo Caja Calleja
Design Aspects of Passenger Box Wing Aircraft
3rd Symposium on Collaboration in Aircraft Design
Linköping, Sweden
19.-20. September 2013
Proceedings of the 3rd Symposium on Collaboration in Aircraft Design

Marker: TI-FF

Zusammenfassung: Future passenger aircraft strive for less fuel consumption, but their design is driven by the requirement at airports of a maximum of e.g. 36m wing span for short/medium range aircraft. A box wing aircraft staying within the 36m limit could achieve a drastic reduction in induced drag and hence fuel consumption. Indeed, box wing aircraft have been considered since decades, but so far very little has been done proposing a type that can be certified and is suitable to be used by airlines. This investigation selects the best configuration from a modified morphological analysis, looks at performance, aerodynamic and longitudinal static stability, cabin/fuselage layout, family concepts and ground handling. A model of such proposed aircraft was built with rapid prototyping. With all this, the presented material and facts should serve as a baseline for a realistic discussion about the chances of a box wing configuration to be the next generation short/medium range aircraft.


N. Suciu, E. Capri, M. Trevisan, T. Tanaka, H. Tien, Susanne Heise, M. Schuhmacher, M. Nadal, J. Rovira, X. Seguí, J. Casal und R. M. Darbra
Human and Environmental impact produced by E-waste releases at Guiyu Region (China)
Rosa Mari Darbra Bernd Bilitewski (Hrsg.) Global Risk-Based Management of Chemical Additives II : Risk based assessment and management strategies Band 23 aus Handbook of Environmental Chemistry
Seite 349-384.
Verlag: Springer, Berlin u.a.

Marker: LS

Walter Leal Filho, J. Gottwald, V. Schulte, A. Singh, T. Rogers, P. Bijai, N. Corbin, P. Jeetah, V. Persaud, D. Surroop und R. Mohee
Strategies developed by DIREKT for the Small Island Developing States (SIDS) to enhance renewable energy use
W. Leal Filho (Hrsg.) Climate-Smart Technologies Integrating Renewable Energy and Energy Efficiency in Mitigation and Adaptation
Verlag: Springer, Berlin
ISBN: 978-3-642-37752-5

Marker: FTZ-ALS

H. Tien, S. Heise, J. Segui, R. Darbra, N. Suciu, E. Capri, M. Trevisan, M. Schuhmacher, M. Nadal und J. Rovira
Tracking Global Flows of E-Waste Additives by Using Substance Flow Analysis, with a Case Study in China
Rosa Mari Darbra Bernd Bilitewski (Hrsg.) Global Risk-Based Management of Chemical Additives II : Risk based assessment and management strategies Band 23 aus Handbook of Environmental Chemistry
Seite 1-36.
Verlag: Springer, Berlin

Marker: LS

Technische Berichte:

Matthias Wählisch, Thomas C. Schmidt und Stig Venaas
A Common API for Transparent Hybrid Multicast
Dokument Nummer: 7046
RFC Editor,
Dezember 2013

Marker: TI-I

Zusammenfassung: Group communication services exist in a large variety of flavors and technical implementations at different protocol layers. Multicast data distribution is most efficiently performed on the lowest available layer, but a heterogeneous deployment status of multicast technologies throughout the Internet requires an adaptive service binding at runtime. Today, it is difficult to write an application that runs everywhere and at the same time makes use of the most efficient multicast service available in the network. Facing robustness requirements, developers are frequently forced to use a stable upper-layer protocol provided by the application itself. This document describes a common multicast API that is suitable for transparent communication in underlay and overlay and that grants access to the different flavors of multicast. It proposes an abstract naming scheme that uses multicast URIs, and it discusses mapping mechanisms between different namespaces and distribution technologies. Additionally, this document describes the application of this API for building gateways that interconnect current Multicast Domains throughout the Internet. It reports on an implementation of the programming Interface, including service middleware. This document is a product of the Scalable Adaptive Multicast (SAM) Research Group.

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Letzte Änderung: 23.01.15

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