DESC++ (Discrete Event Simulation package using C++) has been developed as an object-oriented tool for quantitative simulation studies of communication protocols and architectures of telecommunication networks. The ma...
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DESC++ (Discrete Event Simulation package using C++) has been developed as an object-oriented tool for quantitative simulation studies of communication protocols and architectures of telecommunication networks. The main issue of such performance studies is to secure proper statistical accuracy of the final simulation results. In DESC++ this problem has been solved by automating analysis of simulation output data, aimed at stopping simulation when the estimates reach the required level of precision. The package consists of various object classes. While some of them are responsible for on-line output data analysis, others allow simulation programs of telecommunication networks to be easily developed by re-using existing (sub)models. We discuss main design and implementational issues of DESC++, and illustrate them by an example. Copyright (C) 1996 Elsevier Science Ltd
This paper describes how the U'DU decomposition method and sub-structuring algorithms can be implemented using object-oriented techniques. It is shown that this enables the algorithms to be implemented very concis...
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This paper describes how the U'DU decomposition method and sub-structuring algorithms can be implemented using object-oriented techniques. It is shown that this enables the algorithms to be implemented very concisely. Moreover, there is no increase in code complexity when the algorithms are extended to take account of sparsity. The sub-structuring, or domain decomposition algorithms are expressed in block matrix terms, and classes are used to represent each of these matrices. The solution processes are incorporated in a finite element program. The finite element program uses a distributed data structure, and this facilitates a straightforward interface between the finite element program and the mathematics. Moreover, the program possesses a clear control structure for responding to user changes to the finite element model. (C) 2001 Civil-Comp Ltd and Elsevier Science Ltd. All rights reserved.
This paper is concerned with the software development of distributed real-time measurement systems. Major gears are modularity, reusability and independency from hardware devices, processors and comunications networks...
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This paper is concerned with the software development of distributed real-time measurement systems. Major gears are modularity, reusability and independency from hardware devices, processors and comunications networks. A light-weight architecture for real-time (DART) is proposed which delivers a systematic methodology centred on object-oriented techniques. The effectiveness of DART is illustrated by means of its application to a distributed measurement system for electrical power plants. (C) 1997 Elsevier Science B.V.
The efficient solving of process control problems often requires manipulating a wide spectrum of knowledge representations ranging from analytical knowledge to qualitative knowledge. These tendencies have been causing...
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The efficient solving of process control problems often requires manipulating a wide spectrum of knowledge representations ranging from analytical knowledge to qualitative knowledge. These tendencies have been causing a growing interest for methods that are flexible enough to accommodate knowledge-based paradigms. In the paper, the simulator design of the amorphous SiO2 precipitation process is described. From the control point of view, the process is a typical semibatch process containing discrete, as well as continuous dynamics. The simulator is developed in G2, which is an environment for the development of real-time expert systems and has been effectively used on a problem containing a great diversity of model descriptions. (C) 1998 Elsevier Science B.V. All rights reserved.
We introduce a translation of the simply typed lambda-calculus into C++, and give a mathematical proof of the correctness of this translation. For this purpose we develop a suitable fragment of C++ together with a den...
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We introduce a translation of the simply typed lambda-calculus into C++, and give a mathematical proof of the correctness of this translation. For this purpose we develop a suitable fragment of C++ together with a denotational semantics. We introduce a formal translation of the lambda-calculus into this fragment, and show that this translation is correct with respect to the denotational semantics. We show as well a completeness result, namely that by translating lambda-terms we obtain essentially all C++ terms in this fragment. We introduce a mathematical model for the evaluation of programs of this fragment, and show that the evaluation computes the correct result with respect to this semantics.
A model postgraduate curriculum for aspect-oriented software development has been derived from the practical experience of running postgraduate courses at nine institutions across Europe (part of the European Network ...
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A model postgraduate curriculum for aspect-oriented software development has been derived from the practical experience of running postgraduate courses at nine institutions across Europe (part of the European Network of Excellence on AOSD). Several institutions have made concrete instantiations of the curriculum, from a summer school to a university master's degree course. The curriculum also relates to the Software Engineering Body of Knowledge.
作者：
POWELL, MSDep. Comp.
Univ. Manchester Inst. Sci. and Technol. PO Box 88 Sackville St. Manchester M60 1QD UK
This paper describes an input/output primitive based on the concept of region hierarchies, which allows highly-structured images of simple or complex data objects to be constructed in a straightforward fashion. In add...
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This paper describes an input/output primitive based on the concept of region hierarchies, which allows highly-structured images of simple or complex data objects to be constructed in a straightforward fashion. In addition, any image of a data object may represent a hierarchical menu which provides access to the operations associated with the object. The programmer is not required to manage the details of an image at the level of the coordinates of the image elements and support is naturally provided for a screen/mouse pair as a fundamental input/output device. The primitive may be extended to support multidimensional representations and time-ordered sequences.
A new object-oriented C + + library (SolidEOS) for calculating the thermoelastic properties of solids is presented. The implementation is based on the Mie-Gruneisen-Debye equation of state (EOS) augmented by lowest or...
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A new object-oriented C + + library (SolidEOS) for calculating the thermoelastic properties of solids is presented. The implementation is based on the Mie-Gruneisen-Debye equation of state (EOS) augmented by lowest order correction for anharmonicity. Several commonly used static EOS like Birch Murnaghan and Vinet models are available. Although some widely used approximation for the Debye-Gruneisen parameter and static EOS are implemented, the final behaviour of the EOS can be easily modified by overloading predefined virtual functions. The article provides a basic physical background of the modern theory of high-pressure EOS. The detailed documentation of the class hierarchy is summarized in the appendix, which accompanies the source. Several examples of practical use are given in the appendix as well. The library is appropriate for applications in geophysics, petrology, material science or any other field where thermodynamic and elastic properties of solids are relevant. The source code is available from the Computers & Geoscience software archive. (c) 2005 Elsevier Ltd. All rights reserved.
Properties that are needed in a language for programming computer vision tasks are described, and a new object-oriented programming language and data management system approach is suggested. An example from automatic ...
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Properties that are needed in a language for programming computer vision tasks are described, and a new object-oriented programming language and data management system approach is suggested. An example from automatic pose estimation is used to illustrate the necessity for the properties in a language system, it is indicated where other languages and data management systems fail to provide these properties, and the type constructors used in the authors' system and features of the language semantics of their system are discussed
Advanced driving assistance systems (ADAS) have huge potential for improving road safety and travel times. However, their take-up in the market is very slow;and these systems should consider driver's preferences t...
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Advanced driving assistance systems (ADAS) have huge potential for improving road safety and travel times. However, their take-up in the market is very slow;and these systems should consider driver's preferences to increase adoption rates. The aim of this study is to develop a model providing drivers with the optimal trajectory considering the motorist's driving style in real time. Travel duration and safety are the main parameters used to find the optimal trajectory. A simulation framework to determine the optimal trajectory was developed in which the ego car travels in a highway environment scenario, using an agent-oriented approach. The performance of the algorithm was compared against optimal trajectories computed offline with the hybrid A* algorithm. The new framework provides trajectories close to the optimal trajectory and is computationally achievable. The agents were shown to follow safe and fast trajectories in three tests scenarios: emergency braking, overtaking and a complex situation with multiple vehicles around the ego vehicle. Different driver profiles were then tested in the complex scenario, showing that the proposed approach can adapt to driver preferences and provide a solution close to the optimal solution given the defined safety constraints.
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