Wache, Holger
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Wache, Holger
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- PublikationAn Agent-based Model for Simulating Smart Grid Innovations(IEEE, 2018) Wache, Holger; Schädler, Philippe; Merelli, Emanuela; Mielczarski, Władysław; Wierzbowski, Michał; Olek, Błażej [in: 15th International Conference on the European Energy Market (EEM)]In order to derive indicators for the future grid and market stability, in this paper an agent-based model is intro- duced, to simulate various scenarios. This includes new market designs, market mixes, emerging technological inventions and new regulations. Consumers demand energy based on seasonal variations or changing prices. The suppliers’ production might also depend on seasonal variations, on the local solar irradiation or its flexibility; the ability to react to the market requests. The model introduced in this paper has been used to describe an example scenario of the year 2035, representing a market mix that includes a variety different consumers and suppliers. Eventually it shows, how the model can be applied to model various scenarios and how the resulting grids frequency, the market prices and suppliers profit can be used as indicators for the grid and market stability.04 - Beitrag Sammelband oder Konferenzschrift
- PublikationTowards a Timely Root Cause Analysis for Complex Situations in Large Scale Telecommunications Networks(Elsevier, 2015) Schaaf, Marc; Wilke, Gwendolin; Mikkola, Topi; Bunn, Erik; Hela, Ilkka; Wache, Holger; Gatziu Grivas, Stella [in: 19th International Conference on Knowledge Based and Intelligent Information and Engineering Systems]04 - Beitrag Sammelband oder Konferenzschrift
- PublikationClassification of Economic Approaches for Smart Grid(IEEE, 2015) Keller, Corinne; Manser, Daniel; Vogler, Sandro; Wache, Holger [in: 12th International Conference on the European Energy Market, IEEE Computer Society Press]Abstract—Several European countries are increasingly focusing on renewable energy in order to satisfy their demand. A core problem of these sources is their reliability, which means less continuously available energy is accessible. Smart grids are trying to cope with this problem by adding intelligence to the net, which tries to adjust the load according to the current produced amount of electrical energy. Many approaches try to tackle down this problem by technical means. This paper analyses existing economical approaches for smart grid environments and highlights the unique features and important properties of a broad selection of papers. Classification criteria are derived from existing literature. Afterwards, the most prominent papers are used to demonstrate how the classification scheme can be applied.04 - Beitrag Sammelband oder Konferenzschrift
- PublikationCapturing Customers' Requirements towards Mixed-Tenancy Deployments of SaaS-Applications(IEEE, 2013) Wache, Holger; Ruehl, Stefan T.; Verclas, Stephan A. W. [in: IEEE Cloud 2013]whose basic idea is to provide applications to the customer on demand over the Internet. In contrast to similar but older approaches, SaaS promotes multi-tenancy as a tool to exploit economies of scale. This means that a single application instance serves multiple customers. However, a major throwback of SaaS is the customers’ hesitation of sharing infrastructure, application code, or data with other tenants. This is due to the fact that one of the major threats of multi-tenancy is information disclosure due to a system malfunction, system error, or aggressive actions by individual users. So far the only approach in research to counteract on this hesitation has been to enhance the Isolation between tenants using the same instance. Our approach (presented in earlier work) tackles this hesitation differently. It allows customers to choose if or even with whom they want to share the application. The approach enables the customer to make that choice not just for the entire application but specifically for individual application components (AC). One of the challenges towards the realization of a mixed-tenancy platform is the capturing of customer requirements. This is why the focus of this paper is to present an approach that enables tenants to express their unique deployment needs. This approach is realized using Semantic Web technologies.04 - Beitrag Sammelband oder Konferenzschrift
- PublikationEnterprise Architecture for Cloud Computing(IEEE, 2012) Aureli, Laura; Pierfranceschi, Arianna; Wache, Holger [in: IEEE Cloud 2012]In this paper we describe an approach to graphically externalize the cloud potential of a company, considering ist architectural description. For this purpose it is shown how current architectural description can be extended, in terms of knowledge and graphical representation. The goal is to focus on the most important features and aspects to consider during the evaluation of shifting into a cloud environment. Even if each company has different strategies and approaches to its business activities, there are some domains related to the shift in a cloud environment that should be considered in any case. This paper shows how these main areas can be taken into account in order to extend the architectural representation of a company and express its cloud readiness04 - Beitrag Sammelband oder Konferenzschrift