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Auflistung nach Schlagwort "Distributed systems"

1 - 5 von 5
  • Zeitschriftenartikel
    A distributed data exchange engine for polystores
    (it - Information Technology: Vol. 62, No. 3-4, 2020) Kaitoua, Abdulrahman; Rabl, Tilmann; Markl, Volker
    There is an increasing interest in fusing data from heterogeneous sources. Combining data sources increases the utility of existing datasets, generating new information and creating services of higher quality. A central issue in working with heterogeneous sources is data migration: In order to share and process data in different engines, resource intensive and complex movements and transformations between computing engines, services, and stores are necessary. Muses is a distributed, high-performance data migration engine that is able to interconnect distributed data stores by forwarding, transforming, repartitioning, or broadcasting data among distributed engines’ instances in a resource-, cost-, and performance-adaptive manner. As such, it performs seamless information sharing across all participating resources in a standard, modular manner. We show an overall improvement of 30 % for pipelining jobs across multiple engines, even when we count the overhead of Muses in the execution time. This performance gain implies that Muses can be used to optimise large pipelines that leverage multiple engines.
  • Zeitschriftenartikel
    Kontextbasierte Kooperation für mobile Geschäftsanwendungen
    (Wirtschaftsinformatik: Vol. 51, No. 4, 2009) Zaplata, Sonja; Kunze, Christian P.; Lamersdorf, Winfried
    Das Potenzial direkt nutzbarer lokaler Ressourcen ist für die Ausführung komplexer mobiler Anwendungsaufgaben oft nicht ausreichend. Basierend auf der kontextbasierten Kooperation ermöglichen daher so genannte mobile Prozesse, die Grenzen einzelner lokaler Systeme und somit die Restriktionen mobiler Geräte und ihrer speziellen Dienste zu überwinden. Durch die hierdurch erreichbare Kombination mobiler und stationärer Ressourcen kann so auch die zuvor nur eingeschränkt mögliche Ausführung individueller dynamischer und spontaner Aufgaben in mobilen Umgebungen verwirklicht werden. Dieser Beitrag stellt einen Ansatz zur Unterstützung mobiler Geschäftsanwendungen durch eine Infrastruktur zur kontextbasierten Ausführung mobiler Prozesse vor. Zudem werden wichtige Anforderungen für den Einsatz im Geschäftsumfeld identifiziert und entsprechende Systemerweiterungen zum Management der resultierenden Anwendungen diskutiert.AbstractRealistic requirements of mobile business applications often exceed the capabilities of their respective local environments. In order to overcome such restrictions of specific mobile devices, services, and resources, this contribution introduces the concept of context-based cooperation. It is based on mobile processes which enable applications to cross boundaries of individual systems and thereby allow combining both mobile and stationary resources in order to realize highly dynamic individual applications. This contribution presents an approach for realizing context-based cooperation built upon on a respective context management infrastructure and execution environment. It also identifies specific requirements and proposes related enhancements for mobile business applications.
  • Konferenzbeitrag
    A survey of distributed biometric authentication systems
    (BIOSIG 2009: biometrics and electronic signatures, 2009) Sarier, Neyire Deniz
    In ACISP'07, Bringer et al proposed a new approach for remote biometric based verification, which consists of a hybrid protocol that distributes the server side functionality in order to detach the biometric data storage from the service provider. Besides, a new security model is defined using the notions of Identity and Transaction Privacy, which guarantees the privacy of the identity-biometrics relationship under the assumption of non-colluding servers. In this survey, we review the scheme of Bringer et al and the following biometric verification systems that improve upon it in terms of computation and communication complexity. In this context, we discuss about the recent result of Sarier, which describes a secure and efficient multi-factor authentication scheme with a different biometric storage method that results in reduced computation and database storage cost.
  • Zeitschriftenartikel
    Techniken zur Realisierung Web-basierter Anwendungen
    (Informatik-Spektrum: Vol. 22, No. 1, 1999) Turau, Volker
    Die Kommerzialisierung des World Wide Web bewirkt eine weitreichende Veränderung der Informationstechnologie. Web-Browser entwickeln sich zum universellen Front-End für Client-Server Anwendungen. Viele kommerzielle Anwendungen wie Informationssysteme oder Buchungssysteme werden auf Web-basierte Systeme umgestellt. In diesem Übersichtsartikel wird eine Klassifikation der bei Web-basierten Anwendungen verwendeten Techniken vorgenommen. Die einzelnen Techniken werden genau beschrieben und miteinander verglichen. Darüberhinaus werden die mit diesen Anwendungen einhergehenden Sicherheitsprobleme diskutiert.Summary The commercial use of the World Wide Web causes a far-reaching change in information technology. Web-browser are becoming the universal front-end for all kinds of client-server applications. Many commercial systems such as information or reservation systems are shifted towards web-based systems. This paper surveys the techniques to realize web-based applications and provides a classification of these techniques. The related security risks are also discussed.
  • Zeitschriftenartikel
    The Collaborative Research Center FONDA
    (Datenbank-Spektrum: Vol. 21, No. 3, 2021) Leser, Ulf; Hilbrich, Marcus; Draxl, Claudia; Eisert, Peter; Grunske, Lars; Hostert, Patrick; Kainmüller, Dagmar; Kao, Odej; Kehr, Birte; Kehrer, Timo; Koch, Christoph; Markl, Volker; Meyerhenke, Henning; Rabl, Tilmann; Reinefeld, Alexander; Reinert, Knut; Ritter, Kerstin; Scheuermann, Björn; Schintke, Florian; Schweikardt, Nicole; Weidlich, Matthias
    Today’s scientific data analysis very often requires complex Data Analysis Workflows (DAWs) executed over distributed computational infrastructures, e.g., clusters. Much research effort is devoted to the tuning and performance optimization of specific workflows for specific clusters. However, an arguably even more important problem for accelerating research is the reduction of development, adaptation, and maintenance times of DAWs. We describe the design and setup of the Collaborative Research Center (CRC) 1404 “FONDA -– Foundations of Workflows for Large-Scale Scientific Data Analysis”, in which roughly 50 researchers jointly investigate new technologies, algorithms, and models to increase the portability, adaptability, and dependability of DAWs executed over distributed infrastructures. We describe the motivation behind our project, explain its underlying core concepts, introduce FONDA’s internal structure, and sketch our vision for the future of workflow-based scientific data analysis. We also describe some lessons learned during the “making of” a CRC in Computer Science with strong interdisciplinary components, with the aim to foster similar endeavors.