Software tools that support implicit parallel programming hold the key to reducing the complexity of parallel programming and realizing more ubiquitous parallel computation. This paper addresses the topic of implicit ...
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Software tools that support implicit parallel programming hold the key to reducing the complexity of parallel programming and realizing more ubiquitous parallel computation. This paper addresses the topic of implicit concurrent object-oriented programming. It presents a new language, SYMPAL, which unlike most existing COOP languages that provide explicit constructs for concurrency control, is based on a unification of object orientation and pure functional programming with the goals of supporting implicit programming and high efficiency in massively concurrent object-oriented programming. Extensive experience with SYMPAL applications on a parallel machine indicates that it achieves these goals.
We argue that for computing majors, it is better to use a 'why' approach to teaching programming than a 'how' approach;this involves (among other things) teaching structured programming before progress...
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We argue that for computing majors, it is better to use a 'why' approach to teaching programming than a 'how' approach;this involves (among other things) teaching structured programming before progressing to higher-level styles such as object-oriented programming. We also argue that, once it has been decided to teach structured programming, Java is a reasonable language to choose for doing so.
A unified algorithm is presented for the refinement of finite element meshes consisting of tensor product Lagrange elements in any number of space dimensions. The method leads to repeatedly refined n-irregular grids w...
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A unified algorithm is presented for the refinement of finite element meshes consisting of tensor product Lagrange elements in any number of space dimensions. The method leads to repeatedly refined n-irregular grids with associated constraint equations. Through an object-oriented implementation existing solvers can be extended to handle mesh refinements without modifying the implementation of the finite element equations. Various versions of the refinement procedure are investigated in a porous media flow problem involving singularities around wells. A domain decomposition-type finite element method is also proposed based on the refinement technique. This method is applied to flow in heterogeneous porous media. (C) 1998 John Wiley & Sons, Ltd.
The Interface object Library based on the Motif extension of the X Windows system and on the ESONE SVIC-VCC Library is presented. Some features of the applications for controlling a synchrotron radiation experiment ar...
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The Interface object Library based on the Motif extension of the X Windows system and on the ESONE SVIC-VCC Library is presented. Some features of the applications for controlling a synchrotron radiation experiment are discussed. The Interface object Library is written in the object-oriented C++ language. The library class-hierarchy structure is presented and discussed. Several interfaces were realized in the Interface object Library: the Windows interface, the CAMAC interface and the interface for supporting the experiment. The behaviour of the objects describing the CAMAC crate and CAMAC block is discussed. The application of these protocols for controlling the fast one-coordinate position-sensitive X-ray detector OD3 is presented.
For further improvements in the field of supervisory and process control it is necessary not only to have a physical but also a logical uniform infrastructure for access to the broad range of product and process infor...
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For further improvements in the field of supervisory and process control it is necessary not only to have a physical but also a logical uniform infrastructure for access to the broad range of product and process information. Up to now, no uniform information infrastructure has been established for the purposes of process control engineering. The advance in vertical network integration in enterprises provides at least the infrastructure for combining the various information partners into one “Process Control Engineering Internet᾿. The open communication system ACPLT/KS with a structured and easily useable application layer built upon the wideley accepted protocols of the Internet is presented.
.*** purpose in this paper is to introduce aspects of userís and developer’s graphical interface associated with operational aspects in an object-oriented environment for symbolic derivation and automatic progra...
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.*** purpose in this paper is to introduce aspects of userís and developer’s graphical interface associated with operational aspects in an object-oriented environment for symbolic derivation and automatic programming of finite elements. The approach is illustrated first on the example of two formulations for the linear elasticity and second on the example of a stabilized formulation for the Navier-Stokes problem.Résumé.On se propose au travers de cette communication de présenter les aspects d’interface et de fonctionnalité d’un environnement mathématique symbolique permettant d’une part la dérivation de formulation d’éléments finis et d’autre part la programmation automatique dans un code numérique. On illustrera l’approche sur deux formulations pour l’élasticité linéaire en milieu incompressible et sur une formulation stabilisée pour le problème de Navier-Stokes.
Although there are many commercial real-time micro-kernel available on the market today, the common prejudices against their use for implementing control algorithms are still justified. Some of them are too complex an...
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Although there are many commercial real-time micro-kernel available on the market today, the common prejudices against their use for implementing control algorithms are still justified. Some of them are too complex and overhead-prone while others are tiny and efficient but don't provide all those services that are actually required by real-time applications. This is especially true regarding communication support for distributed and embedded control systems. This paper focuses on a new design concept for real-time communication system (RCOS) platforms matching the quality and functional needs of a given distributed and embedded application. The approach is based on a library operating system (D reams * ) which allows for extremely fine-grained customizations to avoid systemlevel overhead. We will outline the architecture of D reams , show how customization is applied for interprocessor communication and present first results that demonstrate the impact of customization on system overhead.
A programming language which is optimised for modelling multi-agent interaction within articulated social structures such as organizations is described with several examples of its functionality. The language is SDML,...
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A programming language which is optimised for modelling multi-agent interaction within articulated social structures such as organizations is described with several examples of its functionality. The language is SDML, a strictly declarative modelling language which has object-oriented features and corresponds to a known formal logic. The virtues of SDML include the ease of building complex models and the facility for representing agents flexibly as models of cognition as well as modularity and code reusability. Features of SDML are illustrated by a model of an economic system with cognitive agents and explicit representation of transactions as a process of negotiation and agreement leading to exchange
Nowadays, distributed computing systems are widely used due to the great advances that have been achieved in computer networks in the past few years, and partly due to their low cost. Developing software for these sys...
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Nowadays, distributed computing systems are widely used due to the great advances that have been achieved in computer networks in the past few years, and partly due to their low cost. Developing software for these systems turns out to be complicated, mainly due to the heterogeneity of the distributed system components and the underground communication layers. MMS is a suitable language to carry out the communication between devices in a heterogeneous manufacturing system because it provides uniformity in the access to them. This work proposes the use of the ORB specified in CORBA from the OMG to communicate MMS events.
The paper presents a large scale nonlinear model which is used for supporting international negotiations aimed at improving air quality in Europe. The model helps to identify cost effective measures for reducing air p...
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The paper presents a large scale nonlinear model which is used for supporting international negotiations aimed at improving air quality in Europe. The model helps to identify cost effective measures for reducing air pollution emissions and to examine the resulting concentrations of tropospheric ozone acidification and eutrophication. Several methodological and technical issues related to the specification, generation and optimization-based analysis of large nonlinear models for decision support that are of a more general interest are presented.
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