A model of simulation of wineries operation has been proposed. Each elementary set of knowledge used in the model has been defined as an entity gathering constant data, variable parameters, and expert calculation func...
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A model of simulation of wineries operation has been proposed. Each elementary set of knowledge used in the model has been defined as an entity gathering constant data, variable parameters, and expert calculation functions. The model has been structured hierarchically. It has been implemented in objectorientedprogramming. This expert simulation software produces dynamic balances of resources. This paper presents an application of the software to estimation of water consumption and organic matter rejections. At the winery Caves du Sieur d’Arques in Limoux, both predictions proved to be accurate with a maximum error of 20 % for the 10-day period of the peak of activity of grape-picking.
In many firms 50% and more of software development capacities are absorbed by maintenance tasks. To solve the maintenance problems associated with old programs methods and tools of software renovation have been develo...
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In many firms 50% and more of software development capacities are absorbed by maintenance tasks. To solve the maintenance problems associated with old programs methods and tools of software renovation have been developed. Beginning with a description of the maintenance problem we depict the components of program renovation (restructuring, reverse engineering, reengineering) and explore the possibilities of tool support. Because methods of object-orientation promise a distinct reduction of maintenance costs in the area of software newdevelopment we propose program renovation with transition in an object-oriented architecture in the framework of an object-oriented reengineering.
Genetic algorithms (GAs) have been widely and successfully used for solving complex optimisation problems. This paper presents the research being conducted under the ESPRIT III PAPAGENA project which aims to establish...
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New technologies in computer science applied to numerical computations allow new approaches of mechanical problems. The development of object-oriented programming leads to better structured codes for the finite elemen...
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Too much software development seems trapped in a pre-industrial age, bereft of the productivity gains of standard components and standard designs. object-oriented technology promises to end such failings forever. The ...
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Too much software development seems trapped in a pre-industrial age, bereft of the productivity gains of standard components and standard designs. object-oriented technology promises to end such failings forever. The author briefly discusses the origins of objectoriented software and how it works. objects communicating via messages form the basis of object-oriented technology (OOT). However, the real power of OOT only becomes apparent when these basic concepts are combined with the rather more subtle ideas of class, hierarchy inheritance and polymorphism. The author discusses these concepts and the impact of OOT on computer programming.
This paper presents a knowledge-based approach to analyzing fault-trees of engineering systems. This approach can be used to build a fault-tree from a graphical functional block diagram (using reduction for replicated...
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This paper presents a knowledge-based approach to analyzing fault-trees of engineering systems. This approach can be used to build a fault-tree from a graphical functional block diagram (using reduction for replicated events), to compute minimal cut sets, and to analyze the system for redesign suggestions. An implementation of this approach in a rule-based language is presented. The results are compared with manually prepared reliability reports on an electrical power system and an hydraulic system. The knowledge-based system outperforms the manual procedure in timeliness & accuracy.
A product database for a design and manufacturing enterprise serves as a repository for the data needed to manufacture a product. This paper discusses how an object-oriented persistent object manager named ROSE, under...
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A product database for a design and manufacturing enterprise serves as a repository for the data needed to manufacture a product. This paper discusses how an object-oriented persistent object manager named ROSE, under development at Rensselaer. has been used in the Rensselaer CIM program to develop a STEP/PDES-compliant product database for its research test bed. In so doing, it provides an overview of the requirements for a product database system in an integrated design and manufacturing facility, and it discusses how the chosen system meets these requirements.
This paper presents the development of an event-driven control architecture and its implementation in a physical simulator of a computerized manufacturing system using object-oriented techniques. The architecture was ...
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This paper presents the development of an event-driven control architecture and its implementation in a physical simulator of a computerized manufacturing system using object-oriented techniques. The architecture was developed to improve the efficiency of handling concurrent control events in the DOS environment. In the implementation, the control system of the physical simulator consists of four distinct layers of control devices: a PC/386 computer, a microcontroller, I/O modules and the system's control devices such as motors, solenoids and sensors. A control program residing in the PC/386 coordinates system-level tasks such as event scheduling, while a BASIC program running on the microcontroller handles all low-level control tasks such as sensor monitoring and motion control. The concepts and developments presented in this paper should help in implementing an efficient control system for both CIM systems and their physical simulators.
Knowledge-based CASE tools are able to play an active part in the design of computer-based systems. Providing such tools with in-built domain-specific (or 'real world') knowledge can enhance both the performan...
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Knowledge-based CASE tools are able to play an active part in the design of computer-based systems. Providing such tools with in-built domain-specific (or 'real world') knowledge can enhance both the performance and the appearance of intelligence. However, little work has so far been carried out as to how this might be achieved. The paper illustrates how such knowledge may be provided in the form of generic models based on a thesaurus approach, and applies the technique to a knowledge-based CASE tool designed to support object-oriented design.
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