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Auflistung nach Autor:in "Stadler, Michael"

1 - 6 von 6
  • Konferenzbeitrag
    A Modelling and Simulation Environment for Real-time Pricing Scenarios in Energy Markets
    (Managing Environmental Knowledge, 2006) Sonnenschein, Michael; Stadler, Michael; Rapp, Barbara; Bremer, Jörg; Brunhorn, Stefan
    We describe an agent-based simulation tool for examining the impact of real-time pricing methods upon the power consumption of domestic users (households). The main entities within the model are electricity suppliers and electricity consumers scheduling their demand according to real-time prices for electricity. The main aspect of the modelling and simulation tool consists in very flexible methods to calculate tariffs and in detailed methods for describing the behaviour of electricity consumers communicating with their electricity supplier.
  • Konferenzbeitrag
    A Web-based Reviewing Process Guidance System for an Ecological Database of Plant Traits
    (Informatics for Environmental Protection - Networking Environmental Information, 2005) Ahlers, Dirk; Finke, Jens; Stadler, Michael; Sonnenschein, Michael
    This paper covers the design, development and implementation of a review-based quality management system for an ecological database. We define a quality assurance process similar to that of a peer-review, whereby incoming data is separated into smaller items suitable for individual reviewing based on individual expertise. A simple yet efficient scheduling mechanism is devised that will distribute the trait datasets among the group of reviewers, considering certain particular requirements and conditions.
  • Konferenzbeitrag
    Data Quality, Abstraction and Aggregation in the LEDA Traitbase
    (Sh@ring – EnviroInfo 2004, 2004) Stadler, Michael; Kunzmann, Dierk; Schlegelmilch, Jürgen; Sonnenschein, Michael
    In providing an open European-wide web-based database of plant traits relevant for the conservation and sustainable use of biodiversity in changing European landscapes, the LEDA project aims to support different user groups by providing information about plant traits related to the key features of plant dynamics. The trait database (Traitbase) is currently built from scattered national database initiatives, literature sources and new measurements contributed by persons from the ecological and botanical research community. Here, we discuss the problems of data processing and output customisation arising from the different information needs of three user groups and the heterogeneous data quality in the Traitbase due to the different types of data sources. To this end, we first identify the user groups and their needs. Then, we introduce the terms aggregation and abstraction for the given context. After this, we discuss issues of data quality and finally we go into details of the aggregation methods preferred in generating output for the different user groups.
  • Konferenzbeitrag
    The 5% Approach as Building Block of an Energy System dominated by Renewables
    (Proceedings of the 28th Conference on Environmental Informatics - Informatics for Environmental Protection, Sustainable Development and Risk Management, 2014) Wieben, Enno; Kumm, Thomas; Hohn, Elke; Rohr, Matthias; Stadler, Michael
    We describe an approach for doubling distribution grid capacity for connecting renewable generators based on curtailing a maximum of 5 % of the yearly energy fed in to the grid on a pergenerator basis. The paper contains information about the control unit needed for automatic minimum curtailment and the field test that has been set up to validate the approach. Furthermore, topics concerning the operationalization of the 5 % approach using both, operational technology and information technology are discussed.
  • Konferenzbeitrag
    The Adaptive Fridge – Comparing Different Control Schemes for Enhancing Load Shifting of Electricity Demand
    (Environmental Informatics and Systems Research, 2007) Stadler, Michael; Krause, Wolfram; Sonnenschein, Michael; Vogel, Ute
    Load balancing in electricity grids becomes a more sophisticated problem by the increased availability of time-varying stochastic availability of electricity from renewable resources. Demand side management by load shifting is one attempt to cope with this problem. In this paper we discus and compare two control strategies to use the thermal storage of electrical household appliances as balancing power. For this objective we analyze a simulation model of 5000 controllable refrigerators with respect to the ability to shift their energy demand depending on parameterized external signals. Both control strategies can be used for short term reserves with delivery within 15 minutes of time, but they differ in possible shapes of the resulting load curves and in the reaction time of the controlled system.
  • Konferenzbeitrag
    Using Data Mining Techniques for Exploring the key Features of Plant Dynamics Upon a Newly Built Plant Trait Database
    (Informatics for Environmental Protection - Networking Environmental Information, 2005) Stadler, Michael; Bekker, Renée M.; Finke, Jens; Kunzmann, Dierk; Sonnenschein, Michael
    Most data mining techniques have rarely been used in ecology. To address the specific needs of scientists analysing data from a plant trait database developed during the LEDA project, a web-based data mining tool has been developed. This paper presents the DIONE data miner and the project it has been developed in. It addresses the nature of plant trait data from a data mining perspective and points out problems that arise when preparing data for being mined. Furthermore it contains information about data mining results on plant trait data achieved so far and conclusions towards the applicability of data mining to the fields of ecology, and the newly emerging field of research recently addressed as ecoinformatics.