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Subject = Distributed computing;
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Displaying Results 1  4 of 4 on page 1 of 1
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Aspects of parallel processing and control engineering
(1991)
McKittrick, Brendan J
Aspects of parallel processing and control engineering
(1991)
McKittrick, Brendan J
Abstract:
The concept of parallel processing is not a new one, but the application of it to control engineering tasks is a relatively recent development, made possible by contemporary hardware and software innovation. It has long been accepted that, if properly orchestrated several processors/CPUs when combined can form a powerful processing entity. What prevented this from being implemented in commercial systems was the adequacy of the microprocessor for most tasks and hence the expense of a multiprocessor system was not justified. With the advent of high demand systems, such as highly fault tolerant flight controllers and fast robotic controllers, parallel processing became a viable option. Nonetheless, the software interfacing of control laws onto parallel systems has remained somewhat of an impasse. There are no software compilers at present which allow a programmer to specify a control law in pure mathematical terminology and then decompose it into a flow diagram of concurrent processe...
http://doras.dcu.ie/19056/
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Distributed parallel processing and the factoring problem
(1995)
Cox, Brian
Distributed parallel processing and the factoring problem
(1995)
Cox, Brian
Abstract:
This research is concerned with distributed parallel processing and how a computer cluster/network may be used to solve large and computationally expensive problems, specifically in the area of cryptography and the problem of factoring very large numbers. Until recently few methods or systems were capable of harnessing the full potential power of a distributed environment. In order to realise the full potential of computer clusters, specially designed distributed parallel processing systems are needed. Cryptography is the science of secure communications and has recently become commercially important and widely used. This research focuses on public key cryptography, the security of which is based on the difficulty of factoring extremely large numbers. The research described in this thesis covers parallelism and distributed computing and describes an implementation of a distributed processing system. An introduction to cryptography is presented, followed by a discussion on factori...
http://doras.dcu.ie/18448/
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Petri net modelling of a communications protocol
(1989)
McAllister, Colin J
Petri net modelling of a communications protocol
(1989)
McAllister, Colin J
Abstract:
The Petri net is a formal modelling tool applicable to distributed systems and communication protocols. Two methods of analysis are applied to formal models of the "Alternating Bit Protocol". (i) A timed Petri net model is simulated to measure protocol performance. (ii) A modular numeric Petri net model is validated by reachability analysis. The simulation and validation tools are programmed in (i) "C" language and (ii) Prolog. A specification language "Needle" is developed. It describes the model system as a hierarchy of modular state transition networks. The model is searched for all possible event sequences, and the result displayed as a reachability tree. The specification language is capable of describing models which execute backwards in simulation time. The modular numeric Petri net is the basis of a powerful computer architecture, capable of parsing its own specification language to build complex models. Attention is drawn to the similarities b...
http://doras.dcu.ie/18996/
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The implementation of a largescale numerical model of the atmosphere on a pcbased transputer network
(1992)
Halton, Paul A
The implementation of a largescale numerical model of the atmosphere on a pcbased transputer network
(1992)
Halton, Paul A
Abstract:
This thesis is a report of the study of a largescale Numerical Weather Prediction Model. The study investigated the feasibility of applying parallel algorithms to the HIRLAM Model so that it could be implemented on a Transputer Network. A set of partial differential equations which describe the behaviour of the atmosphere are presented and numerical methods are explored. The investigations focused on time critical regions of the sequential programs. From these a criterion for task distribution was devised. Expressions for the computation of speedup and scaled speedup were derived. A special set of test data, extracted from the Analysis of Hurricane Charlie (August 1986) was used as Input data for a 24 hour forecast. We report on the Case Study and how the model predicted the storm over Ireland. For comparison purposes the Model was also run on a VAX 4200 and on a Dell 386SX PC, with the same data. The execution of the critical program modules was monitored throughout and a tabl...
http://doras.dcu.ie/18794/
Displaying Results 1  4 of 4 on page 1 of 1
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