Prof. Dr. Andreas Fischer
- Angewandte Künstliche Intelligenz
- Netzwerkvirtualisierung (SDN & NFV)
- Widerstandsfähigkeit von Netzen
- Experimentielle Algorithmik
Professor
CIO, Auslandsbeauftragter
Sprechzeiten
Montags, 14:00–16:00
Vortrag
- Andreas Fischer
In: Innovationssymposium „KI in der Glasindustrie"
- 2021
- Angewandte Informatik
- DIGITAL
Vortrag
- Andreas Fischer
In: 1. GlasTAOO4.0 Symposium der Glas-Technologie-Allianz Oberfranken-Ostbayern
- 2021
- Angewandte Informatik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- Andreas Fischer
- M. Amesberger
- 2021
- Angewandte Informatik
- DIGITAL
Zeitschriftenartikel
- M. Welzl
- S. Islam
- M. Gundersen
- Andreas Fischer
In: IEEE Communications Magazine
- 2021
Transport services (TAPS) is a working group of the the Internet Engineering Task Force (IETF). TAPS defines a new recommended API for the Internet's transport layer. This API gives access to a wide variety of services from various protocols, and it is protocol-independent: the transport layer becomes adaptive, and applications are no longer statically bound to a particular protocol and/or network interface. We give an overview of the TAPS API, and we demonstrate its flexibility and ease of use with an example using a Python-based open source implementation.
- Angewandte Informatik
- DIGITAL
Vortrag
- Andreas Fischer
In: 12. DACHS-Symposium für Lehre und angewandte Forschung in Informatik und Wirtschaftsinformatik
- 2021
- Angewandte Informatik
- DIGITAL
Vortrag
- Andreas Fischer
In: Colloquium Series/Workshop at the Computer Science Department
- 2020
The efficient assignment of network resources has been discussed for several years, but continues to be an interesting topic. Initially sparked by the option to virtualize entire communication networks, the problem of assigning dedicated node and link resources has quickly been found to be multi-faceted and computationally hard to solve. The rise of cloud computing and energy-efficiency concerns strengthened the need for efficient resource assignment algorithms. The current drive for SDN and NFV infrastructures brought a new dimension to the problem. This talk will discuss the current state of the art and future research directions in this area.
- Angewandte Informatik
- DIGITAL
Zeitschriftenartikel
- Marco Kretschmann
- Andreas Fischer
- Benedikt Elser
In: Digitale Welt (Proceedings of the First International Symposium on Applied Artificial Intelligence in Conjunction with DIGICON)
- 2020
DOI: 10.1007/s42354-019-0227-2
This paper presents an automated keyword assignment system for scientific abstracts. That system is applied to paper abstracts collected in a local publication database and used to drive a researcher recommendation system. Problems like low data volume and missing keywords are discussed. For remediation, training is performed on an extended data set based on large online publication databases. Additionally a closer look at label imbalance in the dataset is taken. Ten multi-label classification algorithms for assigning keywords from a given catalogue to a scientific abstract are compared. The usage of binary relevance as transformation method with LightGBM as classifier yields the best results. Random oversampling before the training phase additionally increases the F1-Score by around 5-6%.
- Angewandte Informatik
- Angewandte Wirtschaftswissenschaften
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- Andreas Fischer
- A. Paler
- 2019
Quantum computing and network virtualisation share more similarities than it would seem on first thought: both reach their potential by using the underlying hardware as efficiently as possible - a classical computer science problem. Quantum computing research has already been focusing on key problems related to the scarcity of the quantum hardware, hoping that once scalable quantum computers will be available, quantum circuit design automation methods (QCDA) are mature. Consequently, a significant methodological apparatus exists for a technology envisioned to scale in the future. Likewise, the optimisation of resource assignment for virtual networks has received much attention in the literature. As such, any scalability improvement of virtual network embedding (VNE) would be of high practical importance in the present. There is an interesting and promising relationship between VNE and QCDA. This work introduces the possibility to use QCDA methodology for VNE, and vice versa. VNE problem instances can be modeled using the quantum circuit formalism, and we offer some basic examples. To the best of our knowledge, this is the first work that highlights this analogy.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- Andreas Fischer
- D. Bhamare
- A. Kassler
- 2019
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- R. Kühn
- Andreas Fischer
- H. Meer
In: Systems Modeling: Methodologies and Tools. null (EAI/Springer Innovations in Communication and Computing)
- 2019
- Elektrotechnik und Medientechnik
- DIGITAL
Hochschulschrift
- Andreas Fischer
The increasing scale and complexity of computer networks imposes a need for highly flexible management mechanisms. The concept of network virtualization promises to provide this flexibility. Multiple arbitrary virtual networks can be constructed on top of a single substrate network. This allows network operators and service providers to tailor their network topologies to the specific needs of any offered service.
However, the assignment of resources proves to be a problem. Each newly defined virtual network must be realized by assigning appropriate physical resources. For a given set of virtual networks, two questions arise: Can all virtual networks be accommodated in the given substrate network? And how should the respective resources be assigned? The underlying problem is commonly known as the Virtual Network Embedding problem.
A multitude of algorithms has already been proposed, aiming to provide solutions to that problem under various constraints. For the evaluation of these algorithms typically an empirical approach is adopted, using artificially created random problem instances. However, due to complex effects of random problem generation the obtained results can be hard to interpret correctly. A structured evaluation methodology that can avoid these effects is currently missing.
This thesis aims to fill that gap. Based on a thorough understanding of the problem itself, the effects of random problem generation are highlighted. A new simulation architecture is defined, increasing the flexibility for experimentation with embedding algorithms. A novel way of generating embedding problems is presented which migitates the effects of conventional problem generation approaches. An evaluation using these newly defined concepts demonstrates how new insights on algorithm behavior can be gained. The proposed concepts support experimenters in obtaining more precise and tangible evaluation data for embedding algorithms.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- Andreas Fischer
- 2017
DOI: 10.1109/NFV-SDN.2017.8169834
The combination of Software Defined Networking (SDN) and Network Function Virtualization (NFV) promises to provide highly flexible and configurable network infrastructures. This relies, however, on an efficient assignment of the respective Service Function Chain (SFC). This is related to Virtual Network Embedding (VNE), where algorithms are devised to provide such an assignment. To evaluate and compare the efficiency of such algorithms, well-designed embedding problems have to be generated. This paper presents a new mechanism for generating embedding problems: Problems are generated from a given set of SFCs such that each generated problem is known in advance to have an optimal solution. Experimenters can use this approach to investigate specific properties of embedding algorithms. The approach, thereby, facilitates more detailed evaluation.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- Andreas Fischer
- R. Kühn
- W. Mandarawi
- H. Meer
- 2016
Public and private Infrastructure as a Service (IaaS) clouds are widely used by individuals and organizations to provision flexible virtual computing resources on demand. Virtual Network Embedding (VNE) algorithms are employed in this context to provide an automated resource assignment. With multiple involved parties security-aware Virtual Machine (VM) placement becomes highly relevant for production environments. Moreover, VNE algorithms should also consider the security requirements of the interconnections between VMs, thereby extending the problem to networks. This paper discusses security requirements of Virtual Networks (VNs) and shows how they can be modeled in VNE to map them to the provided security mechanisms in the physical network. The paper also presents an implementation of this security-aware VNE model in the public simulation platform ALEVIN, demonstrating the applicability with a realistic use case of such a model.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- W. Mandarawi
- Andreas Fischer
- A. Houyou
- H.-P. Huth
- H. Meer
In: Principles of Performance and Reliability Modeling and Evaluation: Essays in Honor of Kishor Trivedi on his 70th Birthday. null (Springer Series in Reliability Engineering)
- 2016
DOI: 10.1007/978-3-319-30599-8_22
- Elektrotechnik und Medientechnik
- DIGITAL
Zeitschriftenartikel
- Andreas Fischer
- H. Meer
In: IEEE Transactions on Network and Service Management
- 2016
DOI: 10.1109/TNSM.2016.2596802
The efficiency of network virtualization depends on the appropriate assignment of resources. The underlying problem, called Virtual Network Embedding, has been much discussed in the literature, and many algorithms have been proposed, attempting to optimize the resource assignment in various respects. Evaluation of those algorithms requires a large number of randomly generated embedding scenarios. This paper presents a novel scenario generation approach and demonstrates how to produce scenarios with a guaranteed exact solution, thereby facilitating better evaluation of embedding algorithms.
- Elektrotechnik und Medientechnik
- DIGITAL
Zeitschriftenartikel
- M. Beck
- Andreas Fischer
- J. Botero
- C. Linnhoff-Popien
- H. Meer
In: Journal of Network and Computer Applications
- 2015
DOI: 10.1016/j.jnca.2015.06.012
Abstract Network virtualization is widely regarded as a key technology for the Future Internet, enabling the deployment of new network protocols without changing dissimilar hardware devices. This leads to the problem of mapping virtual demands to physical resources, known as Virtual Network Embedding (VNE). Current VNE algorithms do not scale with respect to the substrate network size. Therefore, these algorithms are not applicable in large-scale scenarios where virtual networks have to be embedded in a timely manner. This paper discusses DPVNE, a Distributed and Generic VNE framework: It runs cost-oriented centralized embedding algorithms in a distributed way, spreading workload across the substrate network instead of concentrating it on one single node (as centralized algorithms do). Several state-of-the-art algorithms were evaluated running inside the DPVNE framework. Results show that DPVNE leads to runtime improvements in large-scale scenarios and embedding results are kept comparable.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- Andreas Fischer
- T. Kittel
- B. Kolosnjaji
- T. Lengyel
- W. Mandarawi
- H. Reiser
- B. Taubmann
- E. Weishäupl
- H. Meer
- T. Müller
- M. Protsenko
- 2015
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- A. Cervero
- M. Chincoli
- L. Dittmann
- Andreas Fischer
- A. Garcia
- J. Galan-Jimenez
- L. Lefevre
- H. Meer
- T. Monteil
- P. Monti
- A.-C. Orgerie
- L.-F. Pau
- C. Phillips
- S. Ricciardi
- R. Sharrock
- P. Stolf
- T. Trinh
- L. Valcarenghi
In: Large-Scale Distributed Systems and Energy Efficiency: A Holistic View. null (Wiley Series on Parallel and Distributed Computing)
- 2015
- Elektrotechnik und Medientechnik
- MOBIL
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- W. Mandarawi
- Andreas Fischer
- H. Meer
- E. Weishäupl
- 2015
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- J. Benze
- Andreas Berl
- K. Daniel
- G. Eibl
- D. Engel
- Andreas Fischer
- U. Hofmann
- A. Kießling
- S. Köpsell
- L. Langer
- H. Meer
- C. Neureiter
- M. Niedermeier
- T. Pfeiffenberger
- M. Pietsch
- A. Veichtlbauer
- 2014
- Elektrotechnik und Medientechnik
Beitrag (Sammelband oder Tagungsband)
- M. Beck
- Andreas Fischer
- F. Kokot
- C. Linnhoff-Popien
- H. Meer
- 2014
DOI: 10.1109/NETWKS.2014.6959238
Network virtualization is seen as an enabling technology for the Future Internet. In this context, many Virtual Network Embedding algorithms have been introduced in literature so far. This paper discusses an open source framework for the evaluation of such algorithms. The paper describes features provided by the framework, how to use the framework for evaluating these algorithms, and how to extend the software with respect to novel algorithms and simulation scenarios. Lessons learned are presented, describing how the software evolved towards a mature and highly extensible simulation framework.
- Elektrotechnik und Medientechnik
- DIGITAL
Zeitschriftenartikel
- Andreas Fischer
- J. Botero
- M. Beck
- H. Meer
- X. Hesselbach
In: IEEE Communications Surveys and Tutorials
- 2013
DOI: 10.1109/SURV.2013.013013.00155
Network virtualization is recognized as an enabling technology for the future Internet. It aims to overcome the resistance of the current Internet to architectural change. Application of this technology relies on algorithms that can instantiate virtualized networks on a substrate infrastructure, optimizing the layout for service-relevant metrics. This class of algorithms is commonly known as “Virtual Network Embedding (VNE)” algorithms. This paper presents a survey of current research in the VNE area. Based upon a novel classification scheme for VNE algorithms a taxonomy of current approaches to the VNE problem is provided and opportunities for further research are discussed.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- M. Beck
- Andreas Fischer
- H. Meer
- J. Botero
- X. Hesselbach
- 2013
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- Andreas Fischer
- M. Beck
- H. Meer
- 2013
Network Virtualization is recognized as a key technology for the Future Internet. Energy-efficiency is one of the main challenges in future networking environments. Most algorithms for mapping virtual resources to substrate resources however do not consider energy as a factor for the mapping. In order to evaluate the energy-efficiency of such a mapping, an energy model and appropriate energy-aware metrics are needed. This paper discusses how an algorithm can be modified to take energy-efficiency into account. The modified algorithm is then evaluated, showing that energy-efficiency can be increased with only a minor impact on embedding quality regarding other metrics.
- Elektrotechnik und Medientechnik
- DIGITAL
Zeitschriftenartikel
- Andreas Berl
- M. Niedermeier
- Andreas Fischer
- D. Hutchinson
- H. Meer
In: e&i Elektrotechnik & Informationstechnik (Special Issue on ’Smart Grid and Security’)
Increasing demand in energy consumption, missed modernisations, and the increasing difficulties in predicting power production due to volatile renewable energy sources (e.g., based on wind or sun) impose major challenges to the power grid. Power supply and power demand are closely interconnected with the need to maintain the power grid in a stable state with a sufficient quality of power. This requires energy-relevant information to be exchanged through the so called Energy Information Network. Communication, however, is challenging within the Energy Information Network due to privacy, security, resiliency, and quality-of-service requirements. Particularly, the resilience of communication within the Energy Information Network needs to be considered to maintain the power grid in a stable and controlled state. This paper suggests a Virtualised Energy Information Network (VEIN), where the Energy Information Network is divided into multiple virtual networks that run over a common substrate network. Furthermore, this paper discusses benefits of this approach in terms of privacy, security, and resilience and points out open research questions.
- Elektrotechnik und Medientechnik
Zeitschriftenartikel
- J. Botero
- X. Hesselbach
- Andreas Fischer
- H. Meer
In: Telecommunications Systems: Special Issue on Future Internet Services and Architectures (Trends and Visions)
- 2012
DOI: 10.1007/s11235-011-9437-0
Network Virtualization has emerged as a so-lution for the Internet inability to address the requiredchallenges caused by the lack of coordination amongInternet service providers for the deployment of newservices. The allocation of resources is one of the mainproblems in network virtualization, mainly in the map-ping of virtual nodes and links to specific substratenodes and paths, also known as the virtual networkembedding problem. This paper proposes an algorithmbased on optimization theory, to map the virtual linksand nodes requiring a specific demand, looking for themaximization of the spare bandwidth and spare CPUin the substrate network, taking into account the band-width demanded by thehidden hopswhen a virtuallink is mapped. The components of the virtual networks(nodes and links) that do not ask for an specific demandare then allocated following a fairness criteria.
- Elektrotechnik und Medientechnik
- DIGITAL
Zeitschriftenartikel
- J. Botero
- X. Hesselbach
- M. Duelli
- D. Schlosser
- Andreas Fischer
- H. Meer
In: IEEE Communications Letters
- 2012
DOI: 10.1109/LCOMM.2012.030912.120082
Waste of energy due to over-provisioning and overdimensioning of network infrastructures has recently stimulated the interest on energy consumption reduction by Internet Service Providers (ISPs). By means of resource consolidation, network virtualization based architectures will enable energy saving. In this letter, we extend the well-known virtual network embedding problem (VNE) to energy awareness and propose a mixed integer program (MIP) which provides optimal energy efficient embeddings. Simulation results show the energy gains of the proposed MIP over the existing cost-based VNE approach.
- Elektrotechnik und Medientechnik
- DIGITAL
Zeitschriftenartikel
- G. Marias
- J. Barros
- M. Fiedler
- Andreas Fischer
- H. Hauff
- R. Herkenhoener
- A. Grillo
- A. Lentini
- L. Lima
- C. Lorentzen
- W. Mazurczyk
- H. Meer
- P. Oliveira
- G. Polyzos
- E. Pujol
- K. Szczypiorski
- J. Vilela
- T.T.V. Vinhoza
In: Security and Communication Networks
- 2012
DOI: 10.1002/sec.384
The vision towards the Network of the Future cannot be separated from the fact that today’s networks, and networking services are subject to sophisticated and very effective attacks. When these attacks first appeared, spoofing and distributed denial-of-service attacks were treated as apocalypse for networking. Now, they are considered moderate damage, whereas more sophisticated and inconspicuous attacks, such as botnets activities, might have greater and far reaching impact. As the Internet is expanding to mobile phones and ‘smart dust’ and as its social coverage is liberalized towards the realization of ubiquitous computing (with communication), the concerns on security and privacy have become deeper and the problems more challenging than ever. Re-designing the Internet as the Network of the Future is self-motivating for researchers, and security and privacy cannot be provided again as separate, external, add-on, solutions. In this paper, we discuss the security and privacy challenges of the Network of the Future and try to delimit the solutions space on the basis of emerging techniques. We also review methods that help the quantification of security and privacy in an effort to provide a more systematic and quantitative treatment of the area in the future.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- M. Beck
- Andreas Fischer
- H. Meer
Network virtualization applies virtualization concepts to network resources in order to provide an abstraction from specific hardware. The added flexibility manifests itself in the possibility to create arbitrarily structured virtual networks that do not necessarily have to reflect the topology or the properties of the underlying physical network. The problem of mapping virtual resources to physical resources in such an environment is commonly known as ,,Virtual Network Embedding”, and almost all existing embedding algorithms do this in a centralized manner. The exploitation of distributed approaches aims to improve performance and to increase the level of reliability: stability and scalability of the whole system should be ensured. In this work, we present our ideas how to build such a new approach.
- Elektrotechnik und Medientechnik
- DIGITAL
Zeitschriftenartikel
- J. Rubio-Loyola
- A. Galis
- A. Astorga
- J. Serrat
- L. Lefevre
- Andreas Fischer
- A. Paler
- H. Meer
In: IEEE Communications Magazine
- 2011
DOI: 10.1109/MCOM.2011.6094010
The network of the future will require a greater degree of service-awareness, and an optimal use of network resources. This paper presents the architectural design developed in the AutoI project for an open software-defined network infrastructure that enables the composition of fast and guaranteed services in an efficient manner and the execution of these services in an adaptive way taking into account better shared network resources provided by network virtualisation. Validation results are provided with special emphasis on service deployment scalability over virtualized network infrastructures.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- J. Botero
- X. Hesselbach
- M. Duelli
- D. Schlosser
- Andreas Fischer
- H. Meer
- 2011
Network virtualization is recognized as an enabling technology for the Future Internet that overcomes network ossification. However, it introduces a set of challenges. In any network virtualization environment, the problem of optimally mapping virtual demands to physical resources, known as virtual network embedding (VNE), is a crucial challenge. This paper analyses the behaviour of the main algorithms proposed to solve VNE by means of the ALEVIN framework. The VNE algorithms are evaluated with regard to appropriate metrics such as: cost, revenue, and virtual network acceptance ratio. We also analyse the impact of the recently introduced hidden hop demand concept in the performance of the VNE algorithms.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- M. Duelli
- D. Schlosser
- J. Botero
- X. Hesselbach
- Andreas Fischer
- H. Meer
- 2011
Network virtualization is recognized as an enabling technology for the Future Internet that overcomes network ossification. However, it introduces a set of challenges. In any network virtualization environment, the problem of optimally mapping virtual resources to physical resources, known as virtual network embedding (VNE), is a critical challenge. Several algorithms attempting to solve this problem have been proposed in literature, so far. However, comparison of existing and new VNE algorithms is hard, as each algorithm focuses on different criteria. To that end, the VNREAL project introduces ALEVIN, a framework to compare different algorithms according to a set of metrics, easily incorporate new VNE algorithms, and evaluate these algorithms on a given scenario for arbitrary parameters.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- Andreas Fischer
- A. Fessi
- G. Carle
- H. Meer
- 2011
The resilience of services in the Internet has become an important issue and is expected to become even more important in the future. Virtualization is one of the means which can be deployed for resilience purposes. In this paper we follow a systematic approach to the use of virtualization to increase the resilience of network services. First, we provide an analysis of the potential failures of services running within Virtual Machines (VM) and how VM migration or replication can be used to address these failures. Then, we address the problem of re-establishing connectivity between a service and its clients upon successful migration, by leveraging results from mobility research. A special focus is given to wide-area VM migration, since it is considered as the solution for some difficult failures, e.g., large-scale failures due to natural disasters.
- Elektrotechnik und Medientechnik
- DIGITAL
Zeitschriftenartikel
- Andreas Fischer
- H. Meer
In: Praxis der Informationsverarbeitung und Kommunikation
- 2011
Network virtualization has been recognized as an important technique to overcome the perceived ossification of the current Internet. Several variations of network virtualization have already been discussed in the literature. These approaches use virtualization to partition and/or combine physical network resources into virtual network resources. An actual deployment of virtual networks then requires the network operator to perform a mapping of virtual resources onto physical resources. The question of how this mapping can be performed in an optimal way is commonly known as the Virtual Network Embedding (VNE) problem. Several algorithms to solve this problem have been proposed already. These algorithms, however, focus on optimizing the use of resources with regard to performance. Security constraints to the VNE problem have not been investigated in depth, so far.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- A. Galis
- S. Clayman
- L. Lefevre
- Andreas Fischer
- H. Meer
- J. Rubio-Loyola
- J. Serrat
- S. Davy
In: The Future Internet. null (Lecture Notes of Computer Science (LNCS))
- 2011
DOI: 10.1007/978-3-642-20898-0_2
One of the key aspect fundamentally missing from the current Internet infrastructure is an advanced service networking platform and facilities, which take advantage of flexible sharing of available connectivity, computation, and storage resources. This paper aims to explore the architectural co-existence of new and legacy services and networks, via virtualisation of connectivity and computation resources and self-management capabilities, by fully integrating networking with cloud computing in order to create In-Network Clouds. It also presents the designs and experiments with a number of In-Network Clouds platforms, which have the aim to create a flexible environment for autonomic deployment and management of virtual networks and services as experimented with and validated on large-scale testbeds.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- G. Polyzos
- G. Marias
- S. Arkoulis
- P. Frangoudis
- M. Fiedler
- A. Popescu
- H. Meer
- R. Herkenhoener
- Andreas Fischer
- J. Oberender
The ASPECTS project considered an underlying dynamic spectrum access radio network, spectrum sensing technology and techniques, and spectrum sharing policies and rules and addressed vulnerabilities in all spectrum sharing phases, i.e. spectrum monitoring, negotiation, dissemination of access rules and sharing implementation. In the following sections, we describe our research objectives and our approach towards attaining them, present the main outcome of ASPECTS and conclude with a discussion on the relevance of our project to the Euro-NF vision towards the Future Internet.
- Elektrotechnik und Medientechnik
- DIGITAL
Zeitschriftenartikel
- Andreas Fischer
- J. Botero
- M. Duelli
- D. Schlosser
- X. Hesselbach
- H. Meer
- T. Margaria
- J. Padberg
- G. Taentzer
- H. Hellbrück
- N. Luttenberger
- V. Turau
In: Electronic Communications of the EASST
- 2011
Network virtualization is recognized as an enabling technology for the Future Internet. Applying virtualization of network resources leads to the problem of mapping virtual resources to physical resources, known as “Virtual Network Embedding” (VNE). Several algorithms attempting to solve this problem have been discussed in the literature, so far. However, comparison of VNE algorithms is hard, as each algorithm focuses on different criteria. To that end, we introduce a framework to compare different algorithms according to a set of metrics, which allow to evaluate the algorithms and compute their results on a given scenario for arbitrary parameters.
- Elektrotechnik und Medientechnik
- DIGITAL
Zeitschriftenartikel
- A. Paler
- Andreas Fischer
In: Praxis der Informationsverarbeitung und Kommunikation
- 2011
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- J. Rubio-Loyola
- A. Astorga
- J. Serrat
- W. Chai
- L. Mamatas
- A. Galis
- S. Clayman
- A. Cheniour
- L. Lefevre
- O. Mornard
- Andreas Fischer
- A. Paler
- H. Meer
- 2010
DOI: 10.1109/GLOCOM.2010.5683380
The current Internet does not enable easy introduction and deployment of new network technologies and services. This paper aims to progress the Future Internet (FI) by introduction of a service composition and execution environment that re-use existing components of access and core networks. This paper presents essential service-centric platforms and software systems that have been developed with the aim to create a flexible environment for an Autonomic Internet.
- Elektrotechnik und Medientechnik
- DIGITAL
Zeitschriftenartikel
- Andreas Berl
- Andreas Fischer
- H. Meer
In: Informatik-Spektrum
- 2010
DOI: 10.1007/s00287-010-0420-z
Das Future Internet stellt sich der Herausforderung, die Verknöcherung und die Unzulänglichkeiten des heutigen Internets zu überwinden. Es soll beispielsweise robust, zuverlässig und fehlertolerant sein und dabei Dienste auf energieeffiziente Weise erbringen. Zusätzlich müssen auch neue Anforderungen antizipiert werden, die zukünftige Dienste und Netze stellen, um der Entwicklung von neuen Diensten und Protokollen nicht im Wege zu stehen. Erforderlich ist hierbei die Entwicklung einer äußerst variablen und rekonfigurierbaren Netzwerkarchitektur, die eine möglichst einfache und autonome Netzwerkverwaltung mit einschließt. Die Virtualisierung von Host- und Netzwerkressourcen stellt in diesem Zusammenhang eine der Schlüsseltechnologien dar, mit der diese notwendige Flexibilität erreicht werden kann. Virtualisierung verbirgt die Komplexität von physikalischen Netzwerkinfrastrukturen und stellt homogene, flexible und dynamisch rekonfigurierbare virtuelle Ressourcen zur Verfügung. Dieser Artikel gibt einen Überblick über verschiedene Host- und Netzwerkvirtualisierungsmethoden. An mehreren Beispielen wird aufgezeigt, wie verschiedene Herausforderungen angegangen werden können, die sowohl im heutigen Internet als auch im Internet der Zukunft eine Rolle spielen.
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- J. Rubio-Loyola
- A. Astorga
- J. Serrat
- L. Lefevre
- A. Cheniour
- D. Muldowney
- S. Davy
- A. Galis
- L. Mamatas
- S. Clayman
- D. Macedo
- Z. Movahedi
- G. Pujolle
- Andreas Fischer
- H. Meer
- 2010
DOI: 10.3233/978-1-60750-539-6-105
- Elektrotechnik und Medientechnik
- DIGITAL
Beitrag (Sammelband oder Tagungsband)
- A. Galis
- S. Denazis
- A. Bassi
- P. Giacomin
- Andreas Berl
- Andreas Fischer
- H. Meer
- J. Strassner
- S. Davy
- D. Macedo
- G. Pujolle
- J. Rubio-Loyola
- J. Serrat
- L. Lefevre
- A. Cheniour
- 2009
- Elektrotechnik und Medientechnik
Vortrag
- G. Lovász
- Andreas Fischer
- H. Meer
In: 9th Würzburg Workshop on IP: Joint ITG and Euro-NF Workshop on Visions of Future Generations Networks (EuroView 2009)
- 2009
- Elektrotechnik und Medientechnik
Beitrag (Sammelband oder Tagungsband)
- J. Rubio-Loyola
- J. Serrat
- A. Astorga
- Andreas Fischer
- Andreas Berl
- H. Meer
- G. Koumoutsos
- 2009
- Elektrotechnik und Medientechnik
Zeitschriftenartikel
- Andreas Berl
- Andreas Fischer
- H. Meer
In: Electronic Communications of the EASST (Workshops der Wissenschaftlichen Konferenz Kommunikation in Verteilten Systemen (WowKiVS2009)
The method of system virtualization is very popular for the use in data centers and desktop virtualization today. In this work, system virtualization is applied to core network elements (routers and links) in order to create a virtualized network. The selection of this virtualization method crucially determines the emerging network model. The network model consists of virtual networks, virtual routers, and virtual links that form overlays on top of the physical network. The properties, features, and limitations of this network model are analyzed and described in this paper. Additionally, a proof of concept implementation using currently available technology and infrastructure is presented. Finally the dynamic configurability of virtual resources in such a system virtualization based virtualized network is evaluated.
- Elektrotechnik und Medientechnik
Beitrag (Sammelband oder Tagungsband)
- Andreas Berl
- Andreas Fischer
- H. Meer
- A. Galis
- J. Rubio-Loyola
In: Middleware technologies for enabling next generation network services and applications (Samos Island, Greece, 22nd - 26th September 2008; Proceedings of the 5th International Workshop on Next Generation Networking Middleware (NGNM 2008) and 4th IEEE/IFIP International Workshop on End-to-end Virtualization and Grid Management (EVGM 2008)). null (Multicon lecture note series)
- 2008
- Elektrotechnik und Medientechnik
Beitrag (Sammelband oder Tagungsband)
- Andreas Fischer
- Andreas Berl
- H. Meer
- 2008
- Elektrotechnik und Medientechnik
Beitrag (Sammelband oder Tagungsband)
- S. Davy
- C. Fahy
- L. Griffin
- Z. Boudjemil
- Andreas Berl
- Andreas Fischer
- H. Meer
- J. Strassner
- 2008
- Elektrotechnik und Medientechnik
Beitrag (Sammelband oder Tagungsband)
- Andreas Fischer
- Andreas Berl
- H. Meer
- 2008
- Elektrotechnik und Medientechnik
Projekte
SEMIARID: Natürlichsprachige Semantische Suche in Big Data
Labore
Netzwerklabor DEGGs 1.4
Vita
- seit 2020: CIO der Technischen Hochschule Deggendorf
- seit 2017: Professur “Informatik für Ingenieure”, Technische Hochschule Deggendorf
- 2017: Postdoctoral researcher, Universität Karlstad
- 2017: Promotion zum Dr. rer. nat., Universität Passau
- 2008-2017: Wissenschaftlicher Mitarbeiter, Universität Passau
- 2008: Studienabschluss Diplom Informatiker, Universität Passau
Sonstiges
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