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Cheltenham, United Kingdom

Hause M.,Atego
22nd Annual International Symposium of the International Council on Systems Engineering, INCOSE 2012 and the 8th Biennial European Systems Engineering Conference 2012, EuSEC 2012 | Year: 2012

Modeling of the electric utility network is normally done using bespoke or custom tools and programs rather than generic modeling languages. This requires the engineer to develop the complete simulation system from scratch. In addition, it is difficult to model from different viewpoints and levels of abstraction. The models are normally created from a single perspective to solve a specific problem or analyze the system from a single point of view. The Systems Modeling Language (SysML) was developed by INCOSE and the OMG to provide general purpose modeling language for systems. Most published examples of SysML are of electro-mechanical software intensive systems in the aerospace and transportation industries. This paper documents a work in progress by the author to develop a model of an example electric utility network, including the user interface to show how SysML can be used to model complex systems of systems. In addition, it shows how a simulation tool integrated with SysML provides a means of integrating multiple paradigms as well as a Human Computer Interface to the simulation. © 2012 by Matthew Hause.

Hause M.C.,Atego
IEEE Aerospace Conference Proceedings | Year: 2014

Systems of Systems (SoS) modeling is becoming increasingly important in both civilian and military systems. The Department of Defense (DoD) Defense Acquisition Guidebook, [1] defines a SoS as a 'set or arrangement of systems that results when independent and useful systems are integrated into a larger system that delivers unique capabilities.' Organizations are changing their emphasis from 'We need a new system' to 'We need to achieve a specific outcome.' As these outcomes become more complex and the associated systems more complex, the management, modeling and simulation of these SoS becomes equally challenging. Often, the SoS is modeled in all its complexity, often at a single level of abstraction or level of detail. Instead of a 'megamodel' approach, a standards-based 'model of models' approach is what is necessary. This approach will use the Object Management Group (OMG) Unified Profile for DoDAF and MODAF (UPDM) for modeling enterprise architectures from capabilities to detailed components, and the Reusable Asset Specification (RAS) for defining reusable assets. Combining UPDM and RAS provides a Model of Models approach with the main model specifying assets in various levels of details. The models specified by these assets can be referenced when detailed analysis is required, or hidden when a SoS viewpoint is required, allowing the analyst to see the forest through the trees. The paper will also include an assessment of the applicability and effectiveness of this approach. The International Conference on Systems Engineering (INCOSE) System of Systems Working Group (SoSWG) has collected a set of 'Pain Points on SoS' from a variety of international sources. This paper will review these pain points and discuss how the application of a Model of Model approach, combined with standards-based modeling tools and a reusable assets approach can help to alleviate some of the pain currently being felt by SoS architects and managers. Hopefully, this response to their SOS will deliver some much-needed assistance. © 2014 IEEE.

Hause M.,Atego | Kihlstrom L.-O.,Syntell AB
23rd Annual International Symposium of the International Council on Systems Engineering, INCOSE 2013 | Year: 2013

The capture of system structure, behavior, configuration, interaction, and compliance is common practice in architectures. These are largely static views showing a specific configuration or behavior. IEEE Std 610.12-1990 defines architecture as "the fundamental organization of a system embodied in its components, their relationships to each other, and to the environment, and the principles guiding its design and evolution." (IEEE, 1990) Modeling this evolution or the temporal aspects in architecture frameworks such as the Department of Defense Architecture Framework (DoDAF) was previously problematic. With the release of DoDAF version 2.0, architectures can now take the fourth dimension (Time) into account. The challenge is to identify areas of architecture where time can be modeled and how to take best advantage of it. Also problematic is how to express these concepts without having to expose all the internal ontological relationships upon which DoDAF is built. The Unified Profile for DoDAF and MODAF (UPDM) delivers an implementation of DoDAF 2.0 that provides a clear and concise way of expressing these concepts without requiring the user to become an expert in the DoDAF 2.0 "internal wiring" and detailed ontological concepts. This paper will examine the temporal concepts defined in DoDAF 2.0 and show how time can be effectively integrated into a model to express essential temporal concepts.

Woodcock J.,University of York | Cavalcanti A.,University of York | Fitzgerald J.,Newcastle University | Larsen P.,University of Aarhus | And 2 more authors.
Proceedings - 2012 7th International Conference on System of Systems Engineering, SoSE 2012 | Year: 2012

We discuss the initial design for CML, the first formal language specifically designed for modelling and analysing Systems of Systems (SoSs). It is presented through the use of an example: an SoS of independent telephone exchanges. Its overall behaviour is first specified as a communicating process: a centralised telephone exchange. This description is then refined into a network of telephone exchanges, each handling a partition of the set of subscribers (telephone users). The refinement is motivated by a non-functional requirement to minimise the cabling required to connect geographically distributed subscribers, who are clustered. The exchanges remain as independent systems with respect to their local subscribers, whose service is unaffected by the loss of remote exchanges. © 2012 IEEE.

Coleman J.W.,University of Aarhus | Malmos A.K.,University of Aarhus | Larsen P.G.,University of Aarhus | Peleskay J.,University of Bremen | And 7 more authors.
Proceedings - 2012 7th International Conference on System of Systems Engineering, SoSE 2012 | Year: 2012

It would be useful to have a tool platform that supports systematic engineering of Systems of Systems, especially focused on the case where multiple parties are collaborating on the development. We attempt to provide a vision for a tool that allows collaboration on models developed jointly and that can be systematically analysed. The focus is on the challenges that make this kind of tool - a Collaborative Development Environment- different from a traditional Integrated Development Environment. Finally the paper describes the plans of the COMPASS project to address these challenges. © 2012 IEEE.

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