2016 [ to top ]

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  Cheptsov, A., Koller, B.: Análisis Big Data en sistemas de computación de alto rendimiento: Tecnologías, herramientas y ejemplos, http://www2.ati.es/novatica/2016/237/nv237sum.html., (2016).
  [ Abstract ] [ URL ]
   
  Novática (Revista de la Asociación de Técnicos de Informática), Monografía Big Data, número 237, Julio-Octubre 2017, páginas xx--yy,
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  Koller, B., Gienger, M., Resch, M.M.: High Performance Computing and High Performance Data Analytics - What is the Missing Link? (2016).
   

2015 [ to top ]

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  Palaiologk, A., Koller, B., Wierse, A.: Centre of excellence for HPC and engineering: Concept development. Gehalten auf der (2015).
   
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  Cheptsov, A., Koller, B.: Leveraging High-Performance Computing Infrastructures to Web Data Analytic Applications by Means of Message-Passing Interface. Gehalten auf der (2015).
   
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  Koller, B., Gienger, M., Struckmann, N., Buchholz, J.: Towards an Environment to Deliver High Performance Computing to Small and Medium Enterprises. Sustained Simulation Performance 2015: Proceedings of the Joint Workshop on Sustained Simulation Performance (2015).
   

2014 [ to top ]

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  Cheptsov, A., Wesner, S., Koller, B.: Service-Oriented Development of Workflow-Based Semantic Reasoning Applications. IJDST. 5, 40-53 (2014).
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2012 [ to top ]

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  Cheptsov, A., Koller, B., Adami, D., Davoli, F., Mueller, S., Meyer, N., Lazzari, P., Salon, S., Watzl, J., Schiffers, M., Kranzlmüller, D.: e-Infrastructure for Remote Instrumentation. Computer Standards & Interfaces. 34, 476-484 (2012).
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2011 [ to top ]

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  Koller, B.: Enhanced SLA management in the high performance computing domainPhD dissertation (2011).
   
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  Koller, B.: Enhanced SLA management in the high performance computing domain.PhD dissertationhttp://elib.uni-stuttgart.de/opus/volltexte/2011/6091/ (2011).
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2010 [ to top ]

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  Adami, D., Cheptsov, A., Davoli, F., Koller, B., Lanati, M., Liabotis, I., Vignola, S., Zafeiropoulos, A., Zappatore, S.: The DORII Project e-Infrastructure: Deployment, Applications, and Measurements. In: Magedanz, T., Gavras, A., Nguyen, H.-T., und Chase, J.S. (Hrsg.) TRIDENTCOM. S. 285-295. TRIDENTCOM (2010).
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2009 [ to top ]

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  Frutos, H.M., Kotsiopoulos, I., Micsik, A., Koller, B., Mora, J.: Flexible SLA Negotiation Using Semantic Annotations. In: Dan, A., Gittler, F., und Toumani, F. (Hrsg.) ICSOC/ServiceWave Workshops. S. 165-175. ICSOC/ServiceWave Workshops (2009).
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  Micsik, A., Frutos, H.M., Kotsiopoulos, I., Koller, B.: Semantically supported SLA negotiation. GRID. S. 169-170. GRID (2009).
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  Schubert, L., Kipp, A., Koller, B., Wesner, S.: Service-oriented operating systems: future workspaces. IEEE Wireless Commun. 16, 42-50 (2009).
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  Koller, B.: Towards Optimal Creation of Service Level Agreements. Proceedings of the eChallenges 2009 Conference. Proceedings of the eChallenges 2009 Conference (2009).
   

2008 [ to top ]

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  Hasselmeyer, P., Wieder, P., Koller, B., Schubert, L.: Added Value for Business through eContract Negotiation. Exploiting the Knowledge Economy - Issues, Applications, Case Studies. S. 641-648. Exploiting the Knowledge Economy - Issues, Applications, Case Studies (2008).
  [ Abstract ]
   
  The growing pervasion of all areas of life with information technology massively influences the way people and companies conduct business. Traditional, “manual” methods are changed or replaced, new opportunities are created, and new business models are developed. Distributed IT infrastructures or Grid systems offer basic functions needed for eBusiness, but they do not yet fulfil a number of essential requirements, e.g. regarding the definition and negotiation of electronic contracts. In this paper we analyse one specific business use case regarding novel requirements to be realised by a distributed IT infrastructure or a Grid system. We compare those requirements with the functions existing infrastructures provide and highlight the gaps which need to be bridged to realise novel business models. Based on previous work executed in European ICT projects, we propose an architecture for a service-based system that exploits Service Level Agreements, semantic techniques, and agents to provide added business values through the negotiation of eContracts
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  Schubert, L., Kipp, A., Koller, B.: Supporting collaborative engineering using an intelligent web service middleware. Advanced Engineering Informatics. 22, 431-437 (2008).
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  Kotsiopoulos, I., Jubert, I.S., Tenschert, A., Cirujeda, J.B., Koller, B.: Using Semantic Technologies to Improve Negotiation of Service Level Agreements. Exploiting the Knowledge Economy - Issues, Applications, Case Studies. S. 1045-1052. Exploiting the Knowledge Economy - Issues, Applications, Case Studies (2008).
  [ Abstract ]
   
  The need for automation of the negotiation process between Service Providers and costumers requires flexible protocols that address the issue of Semantic Interoperability. In this work, we present an enhancement of the traditional Service Level Agreement Negotiation Protocols using a lightweight annotation framework borrowed from the SAWSDL specification. We present a complete ontological framework that consists of a set of components that assist the negotiating parties to establish an agreement without having to agree on the same metrics. In order to avoid non-deterministic run times we propose the incorporation of the Monte Carlo algorithm in the negotiation protocol. Finally, we illustrate the applicability and the benefits of our work in a business use case.

2007 [ to top ]

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  Tserpes, K., Schubert, L., Koller, B., Kyriazis, D., Varvarigou, T.: Learning from the Past – SLA Composition Using QoS History. Expanding the Knowledge Economy: Issues, Applications, Case Studies. S. 47-53. Expanding the Knowledge Economy: Issues, Applications, Case Studies (2007).
  [ Abstract ]
   
  With the introduction of Service Oriented Computing principles to modern business-oriented information systems, a greater number of services found their way in provisioning-enabling environments such as e-markets. This resulted in a continuously growing competition between service providers that struggle to win a greater share of the market. In this frame, the service providers have to come up with ways that will enable them to maximize their profits by optimizing their offering and negotiation protocols. This paper introduces the concept and the design pattern for a mechanism that enables service providers to refine their Service Level Agreement (SLA) offers, employing the Service Oriented Architectures’ (SOA) benefits. The mechanism estimates the near-optimal values for the SLA terms so as to avoid violations that will lead to money losses. This estimation is based on historic data, that is, data collected continuously using the negotiation framework’s protocols
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  Schubert, L., Wesner, S., Koller, B., Kipp, A.: Privacy Issues in eContracts – a Hierarchical Model. Exploiting the Knowledge Economy: Issues, Applications, Case Studies. S. 31-39. Exploiting the Knowledge Economy: Issues, Applications, Case Studies (2007).
  [ Abstract ]
   
  Modern day approaches towards realising Service Level Agreement (SLA) specifications generally disrespect essential privacy and confidentiality issues, in particular with respect to exposing information about the infrastructure and how quality related data is gathered and processed. Such information is neither helpful for the customer, nor does it agree with most providers’ confidentiality policies. This paper will present a hierarchical approach towards modelling SLAs that would allow any degree of confidentiality & privacy meeting both customer’s and provider’s requirements. What is more, it would allow the provider to easily reuse the SLA for different infrastructure setups. Such an approach will make it possible to close the gap between the capabilities of SLAs and the requirements towards (electronic) contracts.
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  Schubert, L., Kipp, A., Koller, B.: Supporting Collaborative Engineering Using an Intelligent Web Service Middleware. In: Geilson Loureiro, R.C. (Hrsg.) Complex Systems Concurrent Engineering. S. 577-585. Complex Systems Concurrent Engineering (2007).
   
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  Koller, B., Schubert, L.: Towards autonomous SLA management using a proxy-like approach. Multiagent and Grid Systems. 3, 313-325 (2007).
  [ URL ]
   

2006 [ to top ]

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  Bieber, N., Schubert, L., Koller, B.: The Requirement for an Interoperability Service: Power-Distribution in an eBusiness World. (2006).
   
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  Hasselmeyer, P., Koller, B., Schubert, L., Wieder, P.: Towards SLA-Supported Resource Management. In: Gerndt, M. und Kranzlmüller, D. (Hrsg.) HPCC. S. 743-752. HPCC (2006).
  [ URL ]
   

2005 [ to top ]

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  Koller, B., Schubert, L.: Towards Autonomous SLA Management Using a Proxy-like Approach. In: Hirschfeld, R., Kowalczyk, R., Polze, A., und Weske, M. (Hrsg.) NODe/GSEM. S. 259-275. NODe/GSEM (2005).
  [ URL ]