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Prof. Dr. Andreas Fischer

  • Applied Artificial Intelligence
  • Software-defined Networking and Network Function Virtualization
  • Network Resilience
  • Experimental Algorithmics

Faculty of Computer Science

Professors

Professor

CIO

DEGG's 2.12

0991/3615-653

consulting time

Monday, 14:00–16:00

Sortierung:
Beitrag in Sammelwerk/Tagungsband

  • Zineddine Bettouche
  • Johannes Reisinger
  • Andreas Fischer

Analysis of Features-Brightness Bias in Computer Vision . [Accepted for publication]

  • (2023)
  • Angewandte Informatik
  • DIGITAL
Zeitschriftenartikel

  • Zineddine Bettouche
  • Andreas Fischer

Topical Clustering of Unlabeled Transformer-Encoded Researcher Activity

In: Bavarian Journal of Applied Sciences pg. 504-525.

  • (2023)

DOI: 10.25929/1rjp-d197

Transformer models have the ability to understand the meaning of text efficiently through the use of self-attention mechanisms. We investigate the bundled meanings in clusters of transformer-generated embeddings by evaluating the topical clustering accuracy of the unlabeled scientific papers of the DIT publications database. After experimenting with SciBERT and German-BERT, we focus on mBERT as we work with multilingual papers. We create a landscape representation of the scientific fields with active research through the encoding and clustering of research publications. With the absence of topic labels in the data (no ground truth), the clustering metrics cannot evaluate the accuracy of the topical clustering. Therefore, we make use of the coauthorship aspect in the papers to perform a coauthorship analysis in two parts: the investigation of the authors’ uniqueness in each cluster and the construction of coauthorship-based social networks. The calculated high uniqueness of authors in the formed clusters and the found homogeneity of topics across the connected components (in social networks) imply an accurate topical clustering of our encodings. Moreover, the constructed social networks indicate the existence of a set of connecting internal authors, whose collaborations with each other formed a large network, holding 74% of all papers in the database.
  • Angewandte Informatik
  • DIGITAL
Vortrag

  • Andreas Fischer

Erstellen einer Forschungslandkarte an der THD - eine praktische Anwendung moderner Large Language Models

Landshut

  • 13.07.2023 (2023)
  • Angewandte Informatik
  • DIGITAL
Vortrag

  • Andreas Fischer

Using Transformers Beyond Natural Language Processing

Ostbayerische Technische Hochschule (OTH) Regensburg Regensburg

  • 28.06.2023 (2023)
  • Angewandte Informatik
  • DIGITAL
Vortrag

  • Andreas Fischer

Erstellen einer Forschungslandkarte der TH Deggendorf

Berner Fachhochschule Biel, Schweiz

  • 12.09.2022 (2022)
  • Angewandte Informatik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Andreas Fischer
  • Zineddine Bettouche

High-pass Filters Preprocessing in Image Tracing with Convolutional Autoencoders

pg. 7-12.

  • (2022)
Image tracing describes the task of converting a raster image into a vector format. This paper investigates different processing pipelines that can extract an abstract representation of an image by means of high-pass filtering, autoencoding, and vectorization. Results indicate that reconstructing an image using Autoencoders, then filtering it with high-pass filters, and finally vectorizing it, can represent the image more abstractly while improving the efficiency of the vectorization process.
  • Angewandte Informatik
  • DIGITAL
Zeitschriftenartikel

  • Zineddine Bettouche
  • Andreas Fischer

Improving Image Tracing with Convolutional Autoencoders by High-Pass Filter Preprocessing

In: International Journal on Advances in Software (IARIA Journals) vol. 15 pg. 141 - 151.

  • (2022)

DOI: 10.48550/arXiv.2306.09039

The process of transforming a raster image into a vector representation is known as image tracing. This study looks into several processing methods that include high-pass filtering, autoencoding, and vectorization to extract an abstract representation of an image. According to the findings, rebuilding an image with autoencoders, high-pass filtering it, and then vectorizing it can represent the image more abstractly while increasing the effectiveness of the vectorization process.
  • Angewandte Informatik
  • DIGITAL
Vortrag

  • Andreas Fischer

Pitfalls in Empirical Evaluation of Algorithms. Keynote

Barcelona, Spain

  • 24.04.2022 (2022)
  • Angewandte Informatik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • M. Hollmer
  • Andreas Fischer

Hands-on detection for steering wheels with neural networks

  • (2022)
  • Angewandte Informatik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Zineddine Bettouche
  • Andreas Fischer

Mapping Researcher Activity based on Publication Data by means of Transformers

  • (2022)
  • Angewandte Informatik
  • DIGITAL
Zeitschriftenartikel

  • M. Welzl
  • S. Islam
  • M. Gundersen
  • Andreas Fischer

Transport Services: A Modern API for an Adaptive Internet Transport Layer

In: IEEE Communications Magazine vol. 59 pg. 16-22.

  • (2021)

DOI: 10.1109/MCOM.001.2000870

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
Beitrag in Sammelwerk/Tagungsband

  • Andreas Fischer
  • M. Amesberger

Improving image tracing with artificial intelligence

pg. 714-717.

  • (2021)

DOI: 10.1109/ACIT52158.2021.9548635

Image tracing describes the task to convert a raster image into a vector format. This paper investigates whether dimensionality reduction techniques can improve the results of image tracing by producing simpler vector graphic files while keeping image quality reasonably high. In particular, an Autoencoding Neural Network and Principal Component Analysis are investigated as pre-processing steps before performing the actual tracing. Results indicate that using an Autoencoder as pre-processing step before image tracing can reduce SVG file complexity by over 70% with acceptable impact on image quality.
  • Angewandte Informatik
  • DIGITAL
Vortrag

  • Andreas Fischer

Tinder für Forscher und Cat Content: Zwei interne Forschungsprojekte

Deggendorf

  • 13.09.2021 (2021)
  • Angewandte Informatik
  • DIGITAL
Vortrag

  • Andreas Fischer

Was ist eigentlich KI?

Technologie Anwender Zentrum Spiegelau Zoom

  • 08.07.2021 (2021)
  • Angewandte Informatik
  • DIGITAL
Vortrag

  • Andreas Fischer

Was ist eigentlich KI?

Universität Bayreuth Bayreuth

  • 30.09.2021 (2021)
  • Angewandte Informatik
  • DIGITAL
Zeitschriftenartikel

  • Marco Kretschmann
  • Andreas Fischer
  • Benedikt Elser

Extracting Keywords from Publication Abstracts for an Automated Researcher Recommendation System

In: Digitale Welt (Proceedings of the First International Symposium on Applied Artificial Intelligence in Conjunction with DIGICON) vol. 4 pg. 20-25.

  • (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
Vortrag

  • Andreas Fischer

Reflections on Network Resource Assignment . Invited Talk

Universität Karlstad Karlstad

  • 06.02.2020 (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
Beitrag in Sammelwerk/Tagungsband

  • Andreas Fischer
  • D. Bhamare
  • Andreas Kassler

On the Construction of Optimal Embedding Problems for Delay-Sensitive Service Function Chains

pg. 1-10.

  • (2019)
  • Elektrotechnik und Medientechnik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Andreas Fischer
  • A. Paler

On the analogy between quantum circuit design automation and virtual network embedding

pg. 1378-1383.

ACM New York, NY, USA

  • (2019)

DOI: 10.1145/3297280.3297419

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 in Sammelwerk/Tagungsband

  • R. Kühn
  • Andreas Fischer
  • H. Meer

Modeling Security Requirements for VNE Algorithms: A Practical Approach

pg. 165-179.

Springer International Publishing, Imprint: Springer Cham

  • (2019)
  • Elektrotechnik und Medientechnik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Andreas Fischer

Performance Evaluation for Service Function Chains through Automated Model Building

  • (2017)

  • Elektrotechnik und Medientechnik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Andreas Fischer

Generating Random Service Function Chain Embedding Problems

  • (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
Hochschulschrift

  • Andreas Fischer

An Evaluation Methodology for Virtual Network Embedding

Universität Passau Passau Fakultät für Informatik und Mathematik

  • 2017 (2017)

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 in Sammelwerk/Tagungsband

  • Andreas Fischer
  • R. Kühn
  • W. Mandarawi
  • H. Meer

Modeling Security Requirements for VNE algorithms

  • (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
Patentschrift

  • A. Houyou
  • Andreas Fischer
  • W. Mandarawi
  • H. Meer
  • H.-P. Huth

Device and method for allocating communication resources in a system employing network slicing

  • 29.09.2016 (2016)

  • Elektrotechnik und Medientechnik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • W. Mandarawi
  • Andreas Fischer
  • A. Houyou
  • H.-P. Huth
  • H. Meer

Constraint-Based Virtualization of Industrial Networks

pg. 567-586.

Springer Cham

  • (2016)

DOI: 10.1007/978-3-319-30599-8_22

  • Elektrotechnik und Medientechnik
  • DIGITAL
Zeitschriftenartikel

  • Andreas Fischer
  • H. Meer

Generating Virtual Network Embedding Problems with Guaranteed Solutions

In: IEEE Transactions on Network and Service Management vol. 13 pg. 1-14.

IEEE

  • (2016)

    ISSN: 1932-4537

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
Beitrag in Sammelwerk/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

Green Wired Networks

pg. 39-77.

Wiley

  • (2015)
  • Elektrotechnik und Medientechnik
  • MOBIL
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • Andreas Fischer
  • T. Kittel
  • B. Kolosnjaji
  • T. Lengyel
  • W. Mandarawi
  • H. Reiser
  • B. Taubmann
  • E. Weishäupl
  • H. Meer
  • T. Müller
  • M. Protsenko

CloudIDEA: A Malware Defense Architecture for Cloud Data Centers

  • (2015)
  • Elektrotechnik und Medientechnik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • B. Taubmann
  • H. Reiser
  • T. Kittel
  • Andreas Fischer
  • W. Mandarawi
  • H. Meer

CloudIDEA: Cloud Intrusion Detection, Evidence Preservation and Analysis

  • (2015)

  • Elektrotechnik und Medientechnik
  • DIGITAL
Zeitschriftenartikel

  • M. Beck
  • Andreas Fischer
  • J. Botero
  • C. Linnhoff-Popien
  • H. Meer

Distributed and scalable embedding of virtual networks

In: Journal of Network and Computer Applications vol. 56 pg. 124-136.

  • (2015)

    ISSN: 1084-8045

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 in Sammelwerk/Tagungsband

  • W. Mandarawi
  • Andreas Fischer
  • H. Meer
  • E. Weishäupl

QoS-Aware Secure Live Migration of Virtual Machines

  • (2015)
  • Elektrotechnik und Medientechnik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • M. Beck
  • Andreas Fischer
  • F. Kokot
  • C. Linnhoff-Popien
  • H. Meer

A Simulation Framework for Virtual Network Embedding Algorithms

pg. 1-6.

IEEE

  • (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
Beitrag in Sammelwerk/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

VDE-Positionspapier Energieinformationsnetze und -systeme (Smart Grid Security)

VDE VERLAG Berlin

  • (2014)
  • Elektrotechnik und Medientechnik
Zeitschriftenartikel

  • Andreas Fischer
  • J. Botero
  • M. Beck
  • H. Meer
  • X. Hesselbach

Virtual Network Embedding: A Survey

In: IEEE Communications Surveys and Tutorials vol. 15 pg. 1888-1906.

  • (2013)

    ISSN: 1553-877X

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 in Sammelwerk/Tagungsband

  • Andreas Fischer
  • M. Beck
  • H. Meer

An Approach to Energy-efficient Virtual Network Embeddings

pg. 1142-1147.

IEEE

  • (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

Virtual Energy Information Network: A Resilience Perspective

In: e&i Elektrotechnik & Informationstechnik (Special Issue on ’Smart Grid and Security’) vol. 130 pg. 121-126.

  • (2013)

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
Beitrag in Sammelwerk/Tagungsband

  • M. Beck
  • Andreas Fischer
  • H. Meer
  • J. Botero
  • X. Hesselbach

A distributed, parallel, and generic virtual network embedding framework

pg. 3471-3475.

  • (2013)

DOI: 10.1109/ICC.2013.6655087

  • Elektrotechnik und Medientechnik
  • DIGITAL
Beitrag in Sammelwerk/Tagungsband

  • M. Beck
  • Andreas Fischer
  • H. Meer

Distributed Virtual Network Embedding

  • (2012)

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. Botero
  • X. Hesselbach
  • M. Duelli
  • D. Schlosser
  • Andreas Fischer
  • H. Meer

Energy Efficient Virtual Network Embedding

In: IEEE Communications Letters vol. 16 pg. 756-759.

  • (2012)

    ISSN: 1089-7798

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

Security and Privacy issues for the Network of the Future

In: Security and Communication Networks vol. 5 pg. 987-1005.

  • (2012)

    ISSN: 1939-0122

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
Zeitschriftenartikel

  • J. Botero
  • X. Hesselbach
  • Andreas Fischer
  • H. Meer

Optimal mapping of virtual networks with hidden hops

In: Telecommunications Systems: Special Issue on Future Internet Services and Architectures (Trends and Visions) vol. 51 pg. 273-282.

  • (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
Beitrag in Sammelwerk/Tagungsband

  • J. Botero
  • X. Hesselbach
  • M. Duelli
  • D. Schlosser
  • Andreas Fischer
  • H. Meer

Flexible VNE Algorithms Analysis using ALEVIN

  • (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 in Sammelwerk/Tagungsband

  • M. Duelli
  • D. Schlosser
  • J. Botero
  • X. Hesselbach
  • Andreas Fischer
  • H. Meer

VNREAL: Virtual Network Resource Embedding Algorithms in the Framework ALEVIN

pg. 1-2.

IEEE

  • (2011)

DOI: 10.1109/NGI.2011.5985874

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
Zeitschriftenartikel

  • J. Rubio-Loyola
  • A. Galis
  • A. Astorga
  • J. Serrat
  • L. Lefevre
  • Andreas Fischer
  • A. Paler
  • H. Meer

Scalable Service Deployment on Software Defined Networks

In: IEEE Communications Magazine vol. 49 pg. 84-93.

  • (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 in Sammelwerk/Tagungsband

  • Andreas Fischer
  • A. Fessi
  • G. Carle
  • H. Meer

Wide-Area Virtual Machine Migration as Resilience Mechanism

pg. 72-77.

IEEE

  • (2011)

DOI: 10.1109/SRDSW.2011.16

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
Beitrag in Sammelwerk/Tagungsband

  • A. Galis
  • S. Clayman
  • L. Lefevre
  • Andreas Fischer
  • H. Meer
  • J. Rubio-Loyola
  • J. Serrat
  • S. Davy

Towards In-Network Clouds in Future Internet

vol. 6656 pg. 19-33.

Springer

  • (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 in Sammelwerk/Tagungsband

  • G. Polyzos
  • G. Marias
  • S. Arkoulis
  • P. Frangoudis
  • M. Fiedler
  • A. Popescu
  • H. Meer
  • R. Herkenhoener
  • Andreas Fischer
  • J. Oberender

ASPECTS: Agile Spectrum Security

pg. 1-2.

IEEE

  • (2011)

DOI: 10.1109/NGI.2011.5985872

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

ALEVIN - A Framework to Develop, Compare, and Analyze Virtual Network Embedding Algorithms

In: Electronic Communications of the EASST vol. 37 pg. 1-12.

EASST

  • (2011)

    ISSN: 1863-2122

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

  • Andreas Fischer
  • H. Meer

Position Paper: Secure Virtual Network Embedding

In: Praxis der Informationsverarbeitung und Kommunikation vol. 34 pg. 190-193.

  • (2011)

    ISSN: 0930-5157

DOI: 10.1515/piko.2011.040

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
Zeitschriftenartikel

  • A. Paler
  • Andreas Fischer

vCPI – virtual Component Programming Interface

In: Praxis der Informationsverarbeitung und Kommunikation vol. 34 pg. 142-143.

  • (2011)

    ISSN: 0930-5157

DOI: 10.1515/piko.2011.028

  • Elektrotechnik und Medientechnik
  • DIGITAL
Beitrag in Sammelwerk/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

Managability of Future Internet Networks from a Practical Viewpoint

pg. 105-114.

IOS Press

  • (2010)

DOI: 10.3233/978-1-60750-539-6-105

  • Elektrotechnik und Medientechnik
  • DIGITAL
Zeitschriftenartikel

  • Andreas Berl
  • Andreas Fischer
  • H. Meer

Virtualisierung im Future Internet - Virtualisierungsmethoden und Anwendungen

In: Informatik-Spektrum vol. 33 pg. 186-194.

  • (2010)

    ISSN: 0170-6012

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 in Sammelwerk/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

Platforms and Software Systems for an Autonomic Internet

pg. 1-6.

  • (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
Vortrag

  • G. Lovász
  • Andreas Fischer
  • H. Meer

Network Virtualization and Energy Efficiency

Universität Würzburg Würzburg, Germany University of Würzburg

  • July 2009 (2009)
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/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

Management Architecture and Systems for Future Internet Networks

pg. 112-122.

IOS Press Washington, DC

  • (2009)
  • Elektrotechnik und Medientechnik
Zeitschriftenartikel

  • Andreas Berl
  • Andreas Fischer
  • H. Meer

Using System Virtualization to Create Virtualized Networks

In: Electronic Communications of the EASST (Workshops der Wissenschaftlichen Konferenz Kommunikation in Verteilten Systemen (WowKiVS2009) vol. 17 pg. 1-12.

  • (2009)

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 in Sammelwerk/Tagungsband

  • J. Rubio-Loyola
  • J. Serrat
  • A. Astorga
  • Andreas Fischer
  • Andreas Berl
  • H. Meer
  • G. Koumoutsos

A Viewpoint of the Network Management Paradigm for Future Internet Networks

pg. 93-100.

IEEE Press

  • (2009)
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • Andreas Fischer
  • Andreas Berl
  • H. Meer

Virtual Network Management with XEN

  • (2008)
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • Andreas Berl
  • Andreas Fischer
  • H. Meer
  • A. Galis
  • J. Rubio-Loyola

Management of Virtual Networks

pg. 197-202.

Multicon Multimedia Consulting Schöneiche bei Berlin

  • (2008)
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • Andreas Fischer
  • Andreas Berl
  • H. Meer

Virtualized Networks based on System Virtualization

  • (2008)
  • Elektrotechnik und Medientechnik
Beitrag in Sammelwerk/Tagungsband

  • S. Davy
  • C. Fahy
  • L. Griffin
  • Z. Boudjemil
  • Andreas Berl
  • Andreas Fischer
  • H. Meer
  • J. Strassner

Towards a Policy-Based Autonomic Virtual Network to Support Differentiated Security Services

  • (2008)
  • Elektrotechnik und Medientechnik

projects

SEMIARID: Natural Language Semantic Search in Big Data; KIGA: AI-based analysis of business processes

labs

Network Lab DEGGs 1.4

Vita

  • since 2020: CIO of the Deggendorf Institute of Technology
  • since 2017: Professor in “Computer Science for Engineers”, Deggendorf Institute of Technology
  • 2017: Postdoctoral researcher, Karlstad University
  • 2017: PhD graduation (Dr. rer. nat.), Universität Passau
  • 2008-2017: Research Associate, Universität Passau
  • 2008: Graduate as “Diplom Informatiker” (Master-equivalent), Universität Passau

Other

Please find further information on my personal homepage: @ndreas.de.