MDL: a system for fast simulation of large layered neural networks

Article Abstract:

The Model Development Language (or MDL) is a simulation language and system which uses an assignment statement notation tailored for 2-dimensional layered neural networks. The key features are: (1) Operations occur on 2-dimensional arrays which correspond to the layout of many brain structures. (2) A spatial convolution operation models spatial summation occurring in dendritic trees. (3) Arbitrary time invariant expressions and differential equations may be specified by simple assignment statements. (4) Numerical methods are automatically taken care of in the MDL environment rather than in the user's specification of the model. These features allow high level modeling using leaky integrator model neurons and modeling of detailed biophysical properties, such as the Hodgkin-Huxley equations and voltage clamp experiments. Conciseness of the language allows specification of a moderately complex retina model in only one or two pages of code. The parallel structure of the language allows highly optimized implementation on parallel or vector processing computers. Use of the language is illustrated through two examples. (Reprinted by permission of the publisher.)

Neural networks, Technology, Brain, Product introduction, Computer graphics, Network Models, Simulation Languages, New Technique, Two-Dimensional Graphics, Neural Network, Biomedicine

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GIBSS: a model specification framework for multi-stage, manufacturing system design

Article Abstract:

Heterogeneous simulation models are used in the initial, multistage design of discrete parts manufacturing systems. Current research is directed toward the development of an object-oriented, model-base environment which will facilitate heterogeneous modeling. To this end, the GIBSS (Generalized Interaction Based Simulation Specification) frameworks have been developed. The GIBSS conceptual framework permits the modular specification of heterogeneous models through the logical assemblage of entity, interaction, and transition objects. The GIBSS logic framework defines the synchronous execution of objects which use various mixtures of continuous and discrete event simulation techniques and/or manage multiple attribute sets. This paper describes the GIBSS frameworks and provides a case study of their application. (Reprinted by permission of the publisher.)

Systems analysis, Computer aided manufacturing, Object oriented programming, Specifications, System Design, Simulation, Discrete Simulation, Computer-Aided Manufacturing, Event-Driven Systems, Object-Oriented Programming

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