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.
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.
Synchronous reactive systems continually react with their environment. Based on formal hypothesis and complete semantics, this approach brings rigor and flexibility. The aim of some research is to specify a common cod...
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Synchronous reactive systems continually react with their environment. Based on formal hypothesis and complete semantics, this approach brings rigor and flexibility. The aim of some research is to specify a common code which can be used as an intermediate code or gateway for the present synchronous languages, this paper is consistent with this spirit. SOL (State object Language) is proposed and its concepts are presented. From an object code of synchronous language, the equivalent SOL program is generated. The result is a clean program with a high abstraction level, this allows the application evolution and maintenance in an incremental way.
The problem of noise-resistance LSS control on the basis of interpreting a built-in hierarchical situational model IOHiP is considered. The method of multi-jump hypotheses for noise-resistant interpretation based on s...
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The problem of noise-resistance LSS control on the basis of interpreting a built-in hierarchical situational model IOHiP is considered. The method of multi-jump hypotheses for noise-resistant interpretation based on sequential analysis of the current situations hierarchy is suggested and discussed. An object-oriented IOHiP for definition of the general LSS structure and its dynamic state using the multi-jump hypotheses method is suggested. The interpretation algorithm is given in detail.
Making a finite element code easier to maintain is achieved by further modularizing it. Due to its two levels of modularity (of procedures and data), object-oriented programming is the method of choice. Its potential ...
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Making a finite element code easier to maintain is achieved by further modularizing it. Due to its two levels of modularity (of procedures and data), object-oriented programming is the method of choice. Its potential is investigated in two bottlenecks of finite element programming where so far it has not proved significantly more successful than classical Fortran programming. The first of these is the lack of adequate data structures between the analysis specifications and the basic objects of the finite element method, like the element and the node. This is solved by defining two classes of objects, namely problem and domain, with clearly differentiated specifications. The second gap deals with solving linear equation systems. Introducing an intermediate class UnassembledMatrix allows alternative storage/solving schemes to be implemented in a very flexible manner. (C) 1997 by John Wiley & Sons, Ltd.
Kinematic indicators play an increasingly important role in the interpretation of rocks that experienced deformation in the deep crust. Because most ductile shear zones lack clearly offset markers, small-scale structu...
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Kinematic indicators play an increasingly important role in the interpretation of rocks that experienced deformation in the deep crust. Because most ductile shear zones lack clearly offset markers, small-scale structures such as asymmetric porphyroclast tails, porphyroblast inclusion trails, and composite planar (S-C) fabrics usually provide the only records of the sense of displacement. Field observations and analog models have demonstrated that these types of structures can yield reliable shear-sense information, but no single quantitative model has been able to simulate the diverse geometries exhibited by known shear-sense indicators. We have developed such program for Macintosh computers, using object-oriented programming techniques. The program, named ShearSense, demonstrates that the development of most abundant shear-sense indicators is governed by a small number of kinematic variables and that it may be possible to read shear strain magnitude from structural geometries. The program also illustrates the potential of object-oriented programming for computer simulation of geologic phenomena.
The objective of this paper is to describe the object-oriented implementation and computational efficiency of a multibody dynamics algorithm for planar mechanical systems. The underlying formulation uses a unique comb...
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