A5063771413- Distributed and Parallel Computing Systems
- Cloud Computing and Resource Management
- Cloud Data Security Solutions
- Scientific Computing and Data Management
- Service-Oriented Architecture and Web Services
- Access Control and Trust
- Cryptography and Data Security
- Software-Defined Networks and 5G
- Parallel Computing and Optimization Techniques
- Advanced Data Storage Technologies
- Research Data Management Practices
- Semantic Web and Ontologies
- Advanced Optical Network Technologies
- IoT and Edge/Fog Computing
- Business Process Modeling and Analysis
- Multi-Agent Systems and Negotiation
- Blockchain Technology Applications and Security
- Caching and Content Delivery
- Distributed systems and fault tolerance
- Network Security and Intrusion Detection
- Software System Performance and Reliability
- Interconnection Networks and Systems
- Peer-to-Peer Network Technologies
- Advanced Software Engineering Methodologies
- Mobile Agent-Based Network Management
Gesellschaft für wissenschaftliche Datenverarbeitung mbH Göttingen
2014-2023
Czech Academy of Sciences, Institute of Computer Science
2023
University of Göttingen
2017-2021
Max Planck Society
2019
University of Patras
2016
Graz University of Technology
2014
TU Dortmund University
2008-2012
Forschungszentrum Jülich
2002-2009
Campbell Collaboration
2009
Ernst Ruska Centre
2006-2008
Cloud computing materializes the vision of utility computing. Tenants can benefit from on-demand provisioning compute, storage, and networking resources according to a pay-per-use business model. have only limited visibility control over network resources. The owners cloud facilities are also facing challenges in various aspects providing efficiently managing IaaS facilities. In this work we present issues federation that currently addressed with existing technologies. We innovative...
Software defined networking (SDN) and OpenFlow as the outcome of recent research development efforts provided unprecedented access into forwarding plane elements. This is achieved by decoupling network control out devices. separation paves way for a more flexible innovative networking. While SDN concept find their ways commercial deployments, performance evaluation its scalability, delay bounds, buffer sizing similar metrics are not investigated in researches. In spite usage benchmark tools...
Software Defined Networking (SDN) is a concept which provides the network operators and data centres to flexibly manage their networking equipment using software running on external servers. According SDN framework, control management of networks, usually implemented in software, decoupled from plane. On other hand cloud computing materializes vision utility computing. Tenants can benefit on-demand provisioning networking, storage compute resources according pay-per-use business model. In...
The efficient integration of optical switching in data center networks is being studied as a means to cope with surging traffic demands. Optically switched, flatter network architectures more efficiently handle the east-west profiles modern centers. Limitations port count and reconfiguration speed switches require novel designs offering scalability dynamicity. Interaction optically switched plane software-defined control orchestration framework, meeting current common practices centers,...
Since the introduction of software-defined networking (SDN), scalability has been a major concern. There are different approaches to address this issue, and most them can be addressed without losing benefits SDN. SDN provides level flexibility that accommodate network programming management at scale. In work we present recent approaches, which proposed issue deployment. We particularly select hierarchical approach for our performance evaluation study. A mathematical framework based on...
Cloud computing is significantly reshaping the industry built around core concepts such as virtualization, processing power, connectivity and elasticity to store share IT resources via a broad network. It has emerged key technology that unleashes potency of Big Data, Internet Things, Mobile Web Applications, other related technologies; but it also comes with its challenges - governance, security, privacy. This paper focused on security privacy cloud specific reference user authentication...
The FDO One project aims at building a global integrated dataspace based on FAIR digital objects (FDOs). project's main contributions are the development of publicly accessible infrastructure, an international testbed and bridges between multiple emerging dataspaces. These dataspaces defined by important industrial standards, such as Eclipse Dataspace Connector (EDC) implementing specifications IDSA industry 4.0-technology Asset Administration Shell (AAS). A layered architecture basis for...
Access control management in a heterogeneous cloud environment, where the number of users is growing, daunting task for service providers.Efficiency heavily reliant on shared resources modern computing culture.Although data or sharing highly appreciated collaborative projects, preserving identity and access security challenging this context.The difficulties encountered are diverse, including single point failure, incompatibility, dynamic user groups, trust establishment, revocation.Despite...
A typical task of a grid level scheduling service is the orche stration and coordination resources in grid. Especially co-allocation makes high demands on this service. Co-allocation requires scheduler to coordinate resource management systems located different domains. Provided that site autonomy has be respected negotiation only way achieve intended coordination. Today, it common practice do by using web technologies. Furthermore, agreements (SLAs) emerged as new manage usage are already...
Cloud-based services have become a cornerstone of today's IT. The self-service feature inherent in Cloud systems allows customers to play greater role service procurement. However, this restricts the value propositions and Service Level Agreements (SLAs) that providers offer because Quality (QoS) Non Functional Property (NFP) requirements vary from customer customer. In feature-rich SLA templates, contract space gets large, objectives are confidential preferences over QoS NFP often conflict...
The Web Services Agreement specification defines a normative language to formulate Service Level Agreements and basic protocol expose service-level descriptions, validate requests, come an agreement. This protocol, often called "take-it-or-leave-it", allows service provider consumer decide whether accept or reject offer. Although this approach is sufficient for number of use cases, others exist with requirements multi-step negotiation the adaptation existing In paper, we describe Negotiation...
Virtualization technologies of Infrastructure-as-a- Service enable the live migration running Virtual Machines (VMs) to achieve load balancing, fault-tolerance and hardware consolidation in data centers. However, downtime/service unavailability due may be substantial with relevance customers' expectations on responsiveness, as latter are declared established Level Agreements (SLAs). Moreover, it cause significant (potentially exponential) SLA violation penalties its associated higher- level...
In current cloud computing systems, when leveraging virtualization technology, the customer's requested data or storing service is accommodated by a set of communicated virtual machines (VM) in scalable and elastic manner. These VMs are placed one more server nodes according to node capacities failure probabilities. The VM placement availability refers probability that at least all operates during lifetime. this paper, we first study problem placing most H groups k on minimum number nodes,...
Abstract Background Medical data from family doctors are of great importance to health care researchers but seem be locked in German practices and, thus, underused research. The RADAR project (Routine Anonymized Data for Advanced Health Services Research) aims at designing, implementing and piloting a generic research architecture, technical software solutions as well procedures workflows unlock doctor’s practices. A long-term medical repository taking legal requirements into account is...