Squier, Richard K.Overview
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Most widely held works by
Richard K Squier
Efficient, scalable architectures for latticegas computations
by Richard K Squier
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Book
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3 editions published in 1991 in English and held by 6 WorldCat member libraries worldwide Abstract: "The subject of this dissertation is finding an architecture for twodimensional cellular automata computations that is verifiably correct, and the fastest and cheapest possible. The motivating problems for this work are largescale scientific computations; the hardware context is that of applicationspecific processors attached to generalpurpose systems. While the conclusions are derived for a specific class of twodimensional cellular automata, the socalled 'lattice gasses, ' they are applicable to a wide range of similar problems
Computease : an introduction to computers, networks and issues of the information age
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Book
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1 edition published in 1998 in English and held by 4 WorldCat member libraries worldwide
Testing parallel simulators for twodimensional latticegas automata
by Richard K Squier
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Book
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1 edition published in 1990 in English and held by 3 WorldCat member libraries worldwide Abstract: "We describe a test method for latticegas automata of the type introduced by Frisch, Hasslacher, and Pomeau. The test method consists of inserting test patterns into the initial state of the automaton and using a graphics display to detect errors. The test patterns are carefully constructed limit cycles that are disrupted by errors occurring at any level of the simulator system. The patterns can be run independently to test the system for debugging purposes, or they can be run as subsimulations embedded in a larger latticegas simulation to detect faults at runtime. We describe the use of this method on a prototype parallel machine for latticegas simulations, and discuss the range of systems that can make use of this type of test method
General parallel computation without CPUs : VLSI realization of a particle machine
by Richard K Squier
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Book
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1 edition published in 1995 in English and held by 2 WorldCat member libraries worldwide Abstract: "We describe an approach to parallel computation using particle propagation and collisons in a onedimensional cellular automaton using a particle model  a Particle Machine (PM). Such a machine has the parallelism, structural regularity, and local connectivity of systolic arrays, but is general and programmable. It contains no explicit multipliers, adders, or other fixed arithmetic operations; these are implemented using finegrain interactions of logical particles which are injected into the medium of the cellular automaton, and which represent both data and processors. We sketch a VLSI implementation of a PM, and estimate its speed and size. We next discuss the problem of determining whether a rule set for a PM is free of conflicts. In general, the question is undecidable, but enough side information is usually available in practice to answer the question in polynomial time. We then show how to implement division in time linear in the number of significant bits of the result, using an algorithm of Leighton. This complements similar previous results for fixedpoint addition/subtraction and multiplication. The precision of the arithmetic is arbitrary, being determined by the particle groups used as input."
Programmable parallel arithmetic in cellular automata using a particle model
by Richard K Squier
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Book
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1 edition published in 1994 in English and held by 1 WorldCat member library worldwide Abstract: "In this paper we show how to embed practical computation in onedimensional cellular automata using a model of computation based on collisions of moving particles. The cellular automata have small neighborhoods, and state spaces which are binary occupancy vectors. They can be fabricated in VLSI, and perhaps also in bulk media which support appropriate particle propagation and collisions. The model uses injected particles to represent both data and processors. Consequently, realizations are highly programmable, and do not have applicationspecific topology, in contrast with systolic arrays. We describe several practical calculations which can be carried out in a highly parallel way in a single cellular automaton, including addition, subtraction, multiplication, arbitrarily nested combinations of these operations, and finiteimpulseresponse digital filtering of a signal arriving in a continuous stream. These are all accomplished in time linear in the number of input bits, and with fixedpoint arithmetic of arbitrary precision, independent of the hardware." Audience Level
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Associated Subjects
Cellular automata Computer architecture Computer networksStudy and teaching ComputersStudy and teaching Electronic data processingStudy and teaching HydrodynamicsComputer simulation Integrated circuitsVery large scale integrationDesign and construction Lattice gas Machine theory Parallel processing (Electronic computers) Programmable array logic Systolic array circuitsDesign and construction

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