Computer aided modeling and simulation of complex systems, using components from multiple application domains, such as electrical, mechanical, hydraulic, control, etc., have in recent years witnessed a significant growth of interest. In the last decade, novel equation-based object-oriented (EOO) modeling languages, (e.g. Modelica, gPROMS, and VHDL-AMS) based on acausal modeling using equations have appeared. Using such languages, it has become possible to model complex systems covering multiple application domains at a high level of abstraction through reusable model components.
   The interest in EOO languages and tools is rapidly growing in the industry because of their increasing importance in modeling, simulation, and specification of complex systems. There exist several different EOO language communities today that grew out of different application areas (multi-body system dynamics, electronic circuit simulation, chemical process engineering). The members of these disparate communities rarely talk to each other in spite of the similarities of their modeling and simulation needs.
   The EOOLT workshop series aims at bringing these different communities together to discuss their common needs and goals as well as the algorithms and tools that best support them.
   Despite the short deadlines and the fact that this is a new not very established workshop series, there was a good response to the call-for-papers. Thirteen papers and one presentation were accepted to the workshop program. All papers were subject to reviews by the program committee, and are present in these electronic proceedings. The workshop program started with a welcome and introduction to the area of equation-based object-oriented languages, followed by paper presentations and discussion sessions after presentations of each set of related papers.
   On behalf of the program committee, the Program Chairmen would like to thank all those who submitted papers to EOOLT'2007. Special thanks go to David Broman who created the web page and helped with organization of the workshop. Many thanks to the program committee for reviewing the papers. EOOLT'2007 was hosted by the Technical University of Berlin, in conjunction with the ECOOP'2007 conference.

Berlin, July 2007

Session 1. Integrated System Modeling Approaches
Session chair: Peter Fritzson

24:1
Christoph Nytsch-Geusen
The use of the UML within the modeling process of Modelica-models
[Abstract and Fulltext]

24:2
Adrian Pop, David Akhvlediani, and Peter Fritzson
Towards Unified System Modeling with the ModelicaML UML Profile
[Abstract and Fulltext]

24:3
Carl-Johan Sjöstedt, De-Jiu Chen, Phillipe Cuenot, Patrick Frey, Rolf Johansson, Henrik Lönn, David Servat, Martin Törngren
Developing Dependable Automotive Embedded Systems using the EAST-ADL; representing continuous time systems in SysML
[Abstract and Fulltext]

Session 2. Hybrid Modeling and Variable Structure Systems
Session chair: François Cellier

24:4
Ramine Nikoukhah
Hybrid dynamics in Modelica: Should all events be considered synchronous
[Abstract and Fulltext]

24:5
Ramine Nikoukhah
Extensions to Modelica for efficient code generation and separate compilation (Short talk)
[Abstract and Fulltext]

24:6
Dirk Zimmer
Enhancing Modelica towards variable structure systems
[Abstract and Fulltext]

24:7
Henrik Nilsson, John Peterson, and Paul Hudak
Functional Hybrid Modeling from an Object-Oriented Perspective
[Abstract and Fulltext]

Session 3. Modeling Languages, Specification, and Language Comparison
Session chair: Christoph Nytsch-Geusen

24:8
Olaf Enge-Rosenblatt, Joachim Haase, and Christoph Clauß
Important characteristics of VHDL-AMS and Modelica with respect to model exchange
[Abstract and Fulltext]

24:9
Günther Zauner, Daniel Leitner, and Felix Breitenecker
Modeling Structural - Dynamics Systems in MODELICA / Dymola, Modelica /Mosilab, and AnyLogic
[Abstract and Fulltext]

24:10
David Broman and Peter Fritzson
Abstract Syntax Can Make the Definition of Modelica Less Abstract
[Abstract and Fulltext]

24:11
Yuri Senichenkov, Felix Breitenecker, and Günther Zauner
Physical Modelling with ModelVision, a DAE Simulator with Features for Hybrid Automata (Short talk)
[Abstract and Fulltext]

Session 4. Tools and Methods
Session chair: Peter Fritzson

24:12
Miguel A. Rubio, Alfonso Urquia, and Sebastian Dormido
An Approach to the Calibration of Modelica Models
[Abstract and Fulltext]

24:13
Johan Åkesson
Dynamic Optimization of Modelica Models – Language Extensions and Tools
[Abstract and Fulltext]

24:14
Bernhard Bachmann, Peter Aronsson, and Peter Fritzson
Robust Initialization of Differential Algebraic Equations
[Abstract and Fulltext]