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A Process-Oriented Architecture for Complex System Modelling

Ritson, Carl G. and Welch, Peter H. (2007) A Process-Oriented Architecture for Complex System Modelling. In: McEwan, Alistair A. and Schneider, S.A. and Ifill, W. and Welch, Peter H., eds. Communicating Process Architectures 2007. Concurrent Systems Engineering Series . IOS Press, Amsterdam, Netherlands, pp. 249-266. ISBN 978-1-58603-767-3. E-ISBN 978-1-60750-261-6.


A fine-grained massively-parallel process-oriented model of platelets (potentially artificial) within a blood vessel is presented. This is a CSP inspired design, expressed and implemented using the occam-pi language. It is part of the TUNA pilot study on nanite assemblers at the universities of York, Surrey and Kent. The aim for this model is to engineer emergent behaviour from the platelets, such that they respond to a wound in the blood vessel wall in a way similar to that found in the human body -- i.e. the formation of clots to stem blood flow from the wound and facilitate healing. An architecture for a three dimensional model (relying strongly on the dynamic and mobile capabilities of occam-pi) is given, along with mechanisms for visualisation and interaction. The biological accuracy of the current model is very approximate. However, its process-oriented nature enables simple refinement (through the addition of processes modelling different stimulants/inhibitors of the clotting reaction, different platelet types and other participating organelles) to greater and greater realism. Even with the current system, simple experiments are possible and have scientific interest (e.g. the effect of platelet density on the success of the clotting mechanism in stemming blood flow: too high or too low and the process fails). General principles for the design of large and complex system models are drawn. The described case study runs to millions of processes engaged in ever-changing communication topologies. It is free from deadlock, livelock, race hazards and starvation em by design, employing a small set of synchronisation patterns for which we have proven safety theorems.

Item Type: Book section
Uncontrolled keywords: concurrency, occam-pi, CSP, complex systems
Subjects: Q Science > QA Mathematics (inc Computing science) > QA 76 Software, computer programming,
Divisions: Faculties > Sciences > School of Computing > Systems Architecture Group
Depositing User: Mark Wheadon
Date Deposited: 24 Nov 2008 18:05 UTC
Last Modified: 03 Jun 2019 09:26 UTC
Resource URI: (The current URI for this page, for reference purposes)
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