Logo des Repositoriums

Auflistung nach Schlagwort "Virtualization"

1 - 6 von 6
  • Zeitschriftenartikel
    Brokerless inter-domain virtual network embedding: A blockchain-based approach
    (it - Information Technology: Vol. 60, No. 5-6, 2018) Rizk, Amr; Bisbal, Jordi; Bergsträßer, Sonja; Steinmetz, Ralf
    The blockchain technology enables entities to query and alter information without trusting a middle party while providing a secure data storage in a decentralized manner. In this paper, we focus on an IT data supply chain scenario, where multiple actors negotiate a tenancy agreement for virtualized network resources. This process consists of service providers (SPs) requesting the embedding of specified virtual networks across multiple infrastructure providers (InPs). Since InPs are typically not willing to disclose detailed internal network information, this is a major deal breaker that hampers the efficiency of the service negotiation process. After reviewing the related work on centralized and decentralized virtual network embedding (VNE) approaches, we briefly discuss the reasons for a blockchain approach for this problem. Our approach comprises of a brokerless blockchain based system, that uses smart contracts and a VN partitioning algorithm based on the Vickrey auction model. Finally, we investigate the feasibility of our approach, by first analyzing the behavior of the introduced auction model in adverse conditions and by secondly evaluating the blockchain performance given different consensus protocols.
  • Zeitschriftenartikel
    Digital Twin: Empowering Enterprises Towards a System-of-Systems Approach
    (Business & Information Systems Engineering: Vol. 62, No. 2, 2020) Dietz, Marietheres; Pernul, Günther
  • Zeitschriftenartikel
    Kontextualisierung der Medienwahl mit Hilfe von Kommunikationsgenres
    (Wirtschaftsinformatik: Vol. 51, No. 2, 2009) Riemer, Kai; Filius, Stefanie
    Wertschöpfung wird zunehmend virtualisiert organisiert, was den effektiven Einsatz von Kommunikationsmedien erfordern. Obwohl die Medienwahl als Entscheidungsproblem in der angelsächsisch geprägten Forschung seit langem thematisiert wird, weisen traditionelle Medienwahltheorien zahlreiche Schwächen mit Blick auf die Gestaltungsfrage auf. Sie sind, ihrem Generalisierungsanspruch geschuldet, zu abstrakt formuliert und hinsichtlich der Anwendung unterspezifiziert. Vor diesem Hintergrund wird in diesem Beitrag ein Ansatz zur Kontextualisierung der Medienwahl mit Hilfe der Genre-Analyse vorgestellt. Deren Ziel ist die Identifikation von Kommunikationsmustern (Genres) in sozialen Gemeinschaften (z. B. Teams) im Sinne eines strukturierten Überblicks der existierenden Teamkommunikation. Durch eine Gegenüberstellung von Genre-Anforderungen und Medien-Charakteristika kann somit eine Verbesserung des Medieneinsatzes vorgeschlagen werden. Das Vorgehen wird anhand eines Fallbeispiels illustriert.AbstractValue creation is increasingly organised in virtualised settings requiring effective computer-mediated communication. While media choice has been a topic of interest in Information Systems for some time, corresponding media choice theories exhibit a range of shortcomings with regard to applicability in context. Since the theories try to generalise across social contexts, their key constructs are rather abstract and underspecified with regard to application. Against this backdrop we present an approach for contextualising media choice using genre analysis. Genre analysis aims at identifying communication patterns (genres) in social communities (e. g. teams) as a structured overview of existing team communication. By juxtaposing requirements of the identified genres and media characteristics, we are able to propose a new set of media for improving team communication. We illustrate the application of our approach with a case example.
  • Textdokument
    A New Level of Trusted Cloud Computing - Virtualized Reconfigurable Resources in a Security-First Architecture
    (INFORMATIK 2017, 2017) Genßler, Paul R.; Knodel, Oliver; Spallek, Rainer G.
    The cloud business is growing year by year, but there are still a lot of security concerns. The users of cloud systems, from a single individual to big companies, have to trust multiple parties who could all interfere and disrupt the provided service or compromise data privacy and security. New software exploits are being found every day, therefore we propose a secured reconfigurable hardware architecture to house sensitive algorithms and data. Using vetted cryptographic techniques and the slight inaccuracy of todays chip-manufacturing to generate unique keys only available to the hardware itself, we are able to create a trusted compute space in a remote cloud system. To achieve typical cloud characteristics like resource pooling and rapid elasticity, the reconfigurable silicon is virtualized while preserving the high security standard.
  • Textdokument
    Security aspects of FPGA and virtualization case studies
    (INFORMATIK 2021, 2021) Tellabi, Asmaa; Sabri, Abdelbast; Ruland, Christoph; Waedt, Karl
    Virtualization technology is a technology that has been integrated a lot lately, thanks to its interoperability and enhanced performances. An essential element in virtualization is the hypervisor that is responsible of managing virtual machines; it allows various guest operating systems (OS) to run on one hardware entity simultaneously. Many researchers recognized the challenge of allowing multiple critical applications to share one hardware platform without interfering, and ensuring security of transactions a major safety and security challenge in virtualization. Usually, security by design is also comprises the protection of intellectual property (IP), possible safety related damages and extend financial losses. By the extension of the usage of programmable logic outside commercial markets to avionics and military applications, security by design integrates extra aspects to ensure safety and cybersecurity. Solutions for protecting application data during transmission and storage exist, but solutions for protecting Field Programmable Gate Array (FPGA) configuration data are not well-known. In the context of Industry 4.0, the FPGA hardware solutions provide the needed level of flexibility and performance. The flexibility, portability and even, to a wide extent, technology independence are due to the software based definition of the hardware via Hardware Description Languages (HDL). In this paper, threats and vulnerabilities surrounding FPGAs will be addressed. An example of a type 1 hypervisor called XtratuM will be ported on top of a Xilinx Soc 7000 zc706 will be integrated, as well as a prototype of embedded system using PetaLinux will be provided.
  • Zeitschriftenartikel
    Virtuelle IT-Studienprojekte – Ein Erfahrungsbericht und Handlungsempfehlungen für Betreuende
    (HMD Praxis der Wirtschaftsinformatik: Vol. 58, No. 6, 2021) Hofer, Julien; Knackstedt, Ralf
    Der vorliegende Beitrag berichtet über die Erfahrungen eines virtuellen Studienprojekts, welches an einer deutschen Universität durchgeführt wurde. Dabei wird ein allgemeiner Überblick über die Virtualisierung von Lernen und Lehren gegeben und ein Fokus auf die agile und virtuelle Herangehensweise gesetzt. Es wird auf wichtige Aspekte der Kollaboration in virtuellen Settings eingegangen, das Setting bei einem IT-Studienprojekt allgemein beschrieben und dann ausführlich über ein konkretes, virtuelle, agiles IT-Studienprojekt in einem IT-Studiengang berichtet. Dieses Projekt befasste sich mit der Konzeption und Gestaltung eines sprachbasierten Conversational User Interfaces im Kontext von Design Thinking. Aufgrund der COVID-19-Pandemie wurde das einjährige Projekt komplett virtuell durchgeführt. Dozierender und Studierende haben also vollkommen digital mit Werkzeugunterstützung gelehrt, gelernt und gearbeitet. Mit diesem Beitrag liefern wir Erfahrungen und Anhaltspunkte, die als Basis für die Gestaltung und Durchführung anderer virtueller und agiler IT-Studienprojekte verwendet werden können. Wir ergänzen den Erfahrungsbericht schließlich mit konkreten Handlungsempfehlungen zu verschiedenen Gestaltungs- und Durchführungsaspekten, die Interessierten – Lehrenden an Hochschulen sowie Praktizierende aus Wirtschaft und Verwaltung – als Hilfestellungen dienen können. The following contribution is a report on a virtual IT capstone project which has been undertaken at a German university. We provide a general overview on virtual learning and teaching. Thereby, we explain selected theoretical underpinnings of agile and virtual methods in the context of universities. We provide knowledge on virtual collaboration drawing upon selected relevant literature. Then, we describe IT capstone projects in general, before we exhaustively report from our experience with a specific virtual, agile IT capstone project. The latter aimed at developing a Conversational User Interface in the realm of Design Thinking. Due to the Covid-19-pandemic the entire project has been executed fully virtual over a period of one year. Hence, supervisor’s teaching and learning on the part of students has been done completely digital supported by IT tools. With this practical-oriented article, we provide experience and design parameters serving as a basis for the design, development and execution of future virtual and agile IT capstone projects. We complement our report with recommendations on various design- and execution-related aspect in order to support not only academic supervisors, but also interested practitioners from areas such as business and public administration.