Research Projects

Ptolemy Project

Edward A. Lee, Ilge Akkaya, Hugo Andrade1, Christopher Brooks, Fabio Cremona, Patricia Derler, Shuhei Emoto2, John Eidson, Barb Hoversten, Hokeun Kim, Akihito Iwai3, Elizabeth Latronico, Gil Lederman, Marten Lohstroh, Marco Marazza, Eleftherios Matsikoudis, Tomi Raty4, Christopher Shaver, Mary Stewart, Stavros Tripakis, Armin Wasicek and Michael Zimmer

TerraSwarm, a Semiconductor Research Corporation center, sponsored by MARCO and DARPA., iCyPhy Research Center (Industrial Cyber-Physical Systems, supported by IBM and United Technologies), National Science Foundation 1446619, National Science Foundation 1329759, National Science Foundation 0931843, National Science Foundation 0720882, National Science Foundation 1035672, Naval Research Laboratory N0013-12-1-G015, Center for Hybrid and Embedded Software Systems, Denso, IHI, National Instruments and Toyota

The Ptolemy Project studies modeling, simulation, and design of concurrent, real-time, embedded systems. The focus is on assembly of concurrent components [1,4]. The key underlying principle in the project is the use of well-defined models of computation that govern the interaction between components. A major problem area being addressed is the use of heterogeneous mixtures of models of computation. Current research thrusts include:

Figure 1
Figure 1: The Ptolemy project is named after Claudius Ptolemaeus, the second century Greek astronomer, mathematician, and geographer.

Johan Eker, Jörn W. Janneck, Edward A. Lee, Jie Liu, Xiaojun Liu, Jozsef Ludvig, Stephen Neuendorffer, Sonia Sachs, Yuhong Xiong, " Taming Heterogeneity - the Ptolemy Approach," Proceedings of the IEEE, Jan 2003, Volume: 91, Issue: 1, p127-144.
S. Edwards and E. A. Lee, " The Case for the Precision Timed (PRET) Machine," UC Berkeley EECS Department Technical Report No. UCB/EECS-2006-149, November 17, 2006.
Y. Zhao, J. Liu, and E. A. Lee, " A Programming Model for Time-Synchronized Distributed Real-Time Systems," Proceedings of the 13th IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS 07), Bellevue, WA, April 3-6, 2007.
Claudius Ptolemaeus, Editor, System Design, Modeling, and Simulation Using Ptolemy II,, 2014.

1National Instruments
4VTT Technical Research Centre of Finland

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