POSE: a process-oriented simulation environment embedded in SCHEME

Article Abstract:

POSE is part of a research program to explore potential benefits of new software technologies for various modelling paradigms. It is a Scheme-based queueing network simulator, whose discussion serves to demonstrate the suitability of symbolic languages and exploratory programming styles for system simulation. After justifying the use of symbolic languages and an object-oriented approach to model design, basic features of POSE are presented, using a simple example. This is followed by a brief description of the simulator's architecture. A final chapter summarizes and reflects on our experiences, suggesting that object-oriented simulation environments hosted on powerful personal workstations may well offer major breakthroughs in terms of effectiveness and user acceptance. Computational efficiency, while a lesser concern to "investigative simulation," remains unsatisfactory in simulations used for quantitative predictions. This problem may hopefully be overcome through future advances in software and hard technologies. (Reprinted by permission of the publisher.)

Future Technologies, Simulation Theory

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Hierarchical, modular discrete-event modelling in an object-oriented environment

Article Abstract:

Hierarchical, modular specification of discrete-event models offers a basis for reusable model bases and hence for enhanced simulation of truly varied design alternatives. We describe an environment which realizes the DEVS formalism developed in Zeigler (1984) for hierarchical, modular models. It is implemented in PC-Scheme, a powerful Lisp dialect for microcomputers containing an object-oriented programming subsystem. Since both the implementation and the underlying language are accessible to the user, the result is a capable-medium for combining simulation modelling and artificial intelligence techniques. The environment is developed in an object-oriented manner which lends itself to model base-organization using the entity structure knowledge representation. It also serves as a medium for developing hierarchical distributed simulation models and architectures. (Reprinted with permission of the publisher.)

Artificial intelligence, Object oriented programming, Hierarchical Organization, Discrete Simulation, Modular Programming, Object-Oriented Languages, technical

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The Control Oriented Language

Article Abstract:

A Control Oriented Language (COL) has been designed to assist engineers in specifying self-contained real-time programs targeted for embedded microprocessor controllers. The language comprises concurrent CSSL-based task segments which support continuous-sequential control and simulation models, and sub-models. A real-time operating system kernel is provided to schedule these tasks. Low-level hardware access statements and a real-time debugging facility have also been incorporated within the COL. (Reprinted by permission of the publisher.)

Programming languages, Software engineering, Programmable controllers, Optimization theory, Control systems, Real time systems, Multitasking (Computing), Microcomputer, Control Structures, Programming Language, Real-Time System, Mathematical Programming, Programmable Controller, Concurrent Programming, Modeling of Computer Systems

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