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• W2029070974 abstract "Expert system first came into use in the fields of medicine (MYCIN) and geology (PROSPECTOR). They have recently established—one could almost say very quickly—their position in the field of chemical engineering. Based on the experience gained until now, we realize that this is only the beginning of a vast development. The topic of this work is the expert system PROSPERT, which was developed at the ‘Lehrstuhl für Technische Chemie A’ of the University of Dortmund. With a few examples, the basic ability to generate process design proposals with PROSPERT that are very similar to the processes in practical industrial use has been demonstrated. This expert system can be used as the basis for the development of a ‘front program’ that can be consulted before extensive optimization calculations are executed using modern simulation programs. With the help of PROSPERT, the multitude of possible design alternatives can be reduced to a reasonable number. The required input data for a problem can usually be obtained easily, and in most of the cases only qualitative statements are needed. The system can run on a higher quality personal computer (e.g. an IBM-AT, 640 kB, 20 MB on hard disk). The system is written in LPA-PROLOG-Professional in combination with the toolkit APES (Augmented PROLOG for Expert Systems). The work we have done until now should verify the basic practicality of the use of expert systems in the range of process design, using only limited domain knowledge. This procedure is referred to as ‘rapid prototyping’, because the declarative programming languages like PROLOG allow fast conversion of verbal formulations to computer programs and an easy test of a new rule using the explanatory component. The further development of PROSPERT is directed towards an extension of the knowledge base, where additional use of the so-called ‘vague knowledge’ shall be made applicable to the system. With a few examples, the basic ability to generate process design proposals with PROSPERT that are very similar to the processes in practical industrial use has been demonstrated. Thus, this expert system can be used as the basis for the development of a ‘front program’ that can be consulted before extensive optimization calculations are executed using modern simulation programs. With the help of PROSPERT, the multitude of possible design alternatives can be reduced to a reassonable number. The required input data for a problem can usually be obtained easily, and in most of the cases only qualitative statements are needed. The system can run on a higher quality personal computer (e.g. an IBM-AT, 640 kB, 20 MB on hard disk). The system is written in LPA-PROLOG-Professional in combination with the toolkit APES (Augmented PROLOG for Expert Systems). The further development of PROSPERT is directed towards an extension of the knowledge base, where additional use of the so-called ‘vague knowledge’ shall be made applicable for the system. For example: a heuristic rule prohibits the use of a distillation if the boiling points of the components are ‘very near’. Up to now this vague statement is implemented with the use of a fixed limit value. In the future, the definition ‘very near’ will be represented using the so-called ‘fuzzy sets’. Every vague value will then be related to a specific probability so that PROSPERT will be able to provide the user with a certainty factor for each of its proposed designs. Nachdem Expertensysteme zunächst in Bereichen wie der Medizin (MYCIN) und der Geologie (PROSPECTOR) Eingang gefunden hatten, haben Sie sich nun—mann kann fast sagen: im Sturm—auch im Bereich der Verfahrenstechnik ihren Raum erobert. Anhand der bisher gemachten Erfahrung muß man davon ausgehen, daß dieses erst der Anfang einer umfassenderen Entwicklung ist. Gegenstand dieser Arbeit ist das am Lehrstuhl für Technische Chemie A entwickelte Expertensystem PROSPERT. An Beispielen wird gezeigt, daß man mit PROSPERT Verfahrensvorschläge generieren kann, die den industriell realisierten Prozessen gerecht werden. Dieses Expertensystem kann als Grundlage für die Schaffung eines Frontprogrammes dienen. Es wird eingesetzt, bevor aufwendige Optimierungsrechnungen mit modernen Simulationsprogrammen durchgeführt werden. Mit seiner Hilfe reduziert sich die Zahl der Alternativen auf ein vertretbares Maß. Die jeweils benötigten Eingabedaten sind meistens leicht zu beschaffen, vielfach genügen qualitative Angaben. Die Rechneranforderungen entsprechen denen eines Personal Computers aus der gehobenen Leistungsklasse, z. B. IBM-AT (640 kB, 20 MB-Festplatte) sowie LPA-PROLOG-Professional als Programmiersprache in Kombination mit der Entwicklungsumgebung APES (Augmented PROLOG for Expert Systems). Mit der bisherigen Arbeit wurde die grundsätzliche Machbarkeit des Einsatzes der Expertensystemtechnik für die Prozeßsynthese mit Hilfe eines vorerst eingeschränkten Regelwissens getestet (‘rapid prototyping’), weil die" @default.
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• W2029070974 date "1988-03-01" @default.
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• W2029070974 title "The use of expert systems in chemical engineering" @default.
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