Oldenburg, Germany
Oldenburg, Germany

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Bolles A.,Offis Institute For Informatik | Appelrath H.-J.,Offis Institute For Informatik | Geesen D.,University of Oldenburg | Grawunder M.,University of Oldenburg | And 4 more authors.
IEEE Intelligent Vehicles Symposium, Proceedings | Year: 2012

One of the main challenges in the development of traffic systems is to assure safety for all road users. Hence, especially expensive vehicles are equipped with advanced driver assistance systems (ADAS) that use data about the vehicle and information about objects in the proximity of the vehicle to execute the assistance function. These objects have to be detected by sensors and they have to be tracked over multiple scans to keep the object's state up-to-date. Usually, such ADAS are developed as proprietary systems that are tailored for the specific assistance function and the specific sensors in use. Indeed, that leads to a very efficient system. However, changing system properties, e. g. an exchange of sensors, is very expensive. In this case, very often at least some parts of the system code have to be reimplemented. To solve this problem of bad maintainability which arises especially during the development of new assistance functions in this work a new architecture for ADAS is presented. The relevant information for the assistance function is no longer provided by hard coded, predefined processes, but by flexible continuous operator plans in a datastream management system. These operator plans build up a dynamic context model of the vehicle's environment. The context model is kept up-to-date by object tracking operators in these operator plans and is then used as a data source to extract information for different assistance functions. This extraction is also done by operator plans that produce only relevant information and discard other information. © 2012 IEEE.


Lehnhoff S.,Offis Institute For Informatik | Krause O.,Queensland University of Technology | Rehtanz C.,TU Dortmund | Wedde H.F.,TU Dortmund
At-Automatisierungstechnik | Year: 2011

The potential of adjusting the demand of certain appliances with time-flexible duty cycles is currently used for load balancing purposes only (e. g. Demand Side Management). However, a coordinated operation scheme for consumers and producers of electrical energy may also be used for grid stabilization or in general for a more efficient utilization of existing distribution grids, directly influencing line currents and voltage profiles along the network. © Oldenbourg Wissenschaftsverlag.


Bohm W.,TU Munich | Henkler S.,Offis Institute For Informatik | Vogelsang A.,TU Munich | Weyer T.,University of Duisburg - Essen
Procedia Computer Science | Year: 2014

A multitude of disciplines is involved in the engineering of embedded systems One major challenge of engineering these systems is to consider the synchronization between different engineering disciplines on the process and artifact level in a coherent manner Process standards address this challenge by defining a transition between the involved activities of the disciplines but they do not provide sufficient support with respect to the corresponding artifacts and their relationships The missing artifact-oriented integration of the engineering disciplines (e g electrical engineering, software engineering, and mechanical engineering) within the systems engineering process leads to error-prone and cost-intensive synchronizations In recent years, we participate in a consortium of more than twenty partners from academia and industry that jointly developed the SPES (Software Platform Embedded Systems) Modeling Framework (SPES MF) to support a seamless artifact-based engineering of software for embedded systems In this paper, we present an approach that fosters the close integration of systems engineering and software engineering activities based on ISO/IEC 15288 and ISO/IEC 12207, by using the core concepts of the SPES MF as a general engineenng philosophy for the architectural design of embedded systems © 2014 The Authors. Published by Elsevier B.V.


Hager U.,TU Dortmund | Lehnhoff S.,Offis Institute For Informatik | Rehtanz C.,TU Dortmund
At-Automatisierungstechnik | Year: 2011

Energy market activities together with an increasing integration of high capacity unpredictable renewable resources (e. g. wind power) pose an increased utilization of electrical transmission networks. In order to eliminate consequential congestions it is necessary to upgrade the grid. Constructing new lines is difficult due to environmental specifications. An alternative is the integration of power flow controllers in order to dynamically redirect power flows. In this paper we present a multi-agent based algorithm that allows for an autonomous distributed coordination of power flow controllers. © Oldenbourg Wissenschaftsverlag.


The German energy market is facing several challenges due to changes in regulation, technical advancements as well as increasing energy costs and climate achievements like CO 2 reduction. This results in changing requirements for companies in the energy market and thus business information systems, which support their core tasks and processes. Software product managers in energy and software developing companies in charge of driving the functional development of information systems have to deal with these challenges and need to develop new information systems or enhance existing ones. Conceptual models proved helpful to design and implement information systems within several industries. However, identification and management of models as well as impact analysis of model changes results difficult. This contribution describes methods to construct, use and maintain a domain specific reference model catalog to support requirements analysis for software product manager in the German electricity and gas market. © 2011 Gabler Verlag.


Uslar M.,Gruppenleiter Interoperabilitat und Standards | Rohjans S.,Wissenschaftlicher Mitarbeiter | M. Gonzalez J.,Offis Institute For Informatik | Specht M.,Offis Institute For Informatik | Trefke J.,Offis Institute For Informatik
Elektrotechnik und Informationstechnik | Year: 2011

Many new challenges arise by the realization of ICT-based smart grids. Standardization is an established means to cope with these challenges in economically efficient manner. This contribution provides an overview on various studies dealing with smart grid standardization and introduces a derived set of core standards. © 2011 Springer-Verlag.


Blank M.,University of Oldenburg | Calabria M.,TU Braunschweig | Dietz R.,Leibniz University of Hanover | Fuchs F.,Leibniz University of Hanover | And 4 more authors.
At-Automatisierungstechnik | Year: 2014

The increase in renewable power generation causes an overall decrease in conventional power generation from large-scale and highly predictable fossil-fuel power plants. Aside frommarket-based provision of active power schedules, these power plants are crucial for the provision of short-term automatic ancillary services such as frequency and voltage control. Substituting these plants for renewable generation units requires the latter to be capable of providing these ancillary services in order to guarantee a reliable and stable power supply. In this paper the authors present an integrated approach for identifying distributed coalitions of agents representing units capable of providing frequency response reserve while taking into account opportunity costs, device specific reliabilities (e. g. for photovoltaic orwind installations) aswell as the smallsignal stability of such coalitions.


Mayer C.,Offis Institute For Informatik | Danekas C.,Offis Institute For Informatik
Informatik-Spektrum | Year: 2013

This contribution outlines the challenges in the fields of computer and information science regarding a future power system. First, the current architecture of the power system is introduced, which basically was designed to support the unidirectional flow of electrical energy from high voltage transportation grids to low voltage distribution grids. The rising amount of decentralized, renewable generation accordingly leads to problems using the full potential of these generation assets while maintaining the stability of the system. The key points of "Smart Grids" are introduced to provide understanding regarding ways to address these problems by using information- and communication technologies in context of the power system architecture. By reference to the project "Future Energy Grid" which was funded by the German Federal Ministry of Economy and Technology an approach to structure the long term migration process is elaborated. On the one hand this includes the construction of scenarios to identify the factors of influence regarding this process. On the other hand technological fields and their link towards the domains of the power system represent the structure of a development roadmap. The key points of this roadmap are explained on the basis of three development phases. © 2012 Springer-Verlag Berlin Heidelberg.


Vazquez J.M.G.,Offis Institute For Informatik | Appelrath H.-J.,Offis Institute For Informatik | Sauer J.,Carl von Ossietzky University
Business and Information Systems Engineering | Year: 2012

The German energy market is facing several challenges due to changes in regulation, technical advancements as well as increasing energy costs and climate achievements like CO 2 reduction. This results in changing requirements for companies in the energy market and thus business information systems, which support their core tasks and processes. Software product managers in energy and software developing companies in charge of driving the functional development of information systems have to deal with these challenges and need to develop new information systems or enhance existing ones. Conceptual models proved helpful to design and implement information systems within several industries. However, identification and management of models as well as impact analysis of model changes results difficult. This contribution describes methods to construct, use and maintain a domain specific reference model catalogue to support requirements analysis for software product manager in the German electricity and gas market. © Gabler Verlag 2011.

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