1,720,974 research outputs found
Interaction as an Issue in the Development of Effective Tools for the Management of the Engineering Knowledge Base
No full textAim of the present paper is to address the requirements of a subsidiary information level to be integrated into a prototypal system for the dynamic generation and management of process and data models of industrial products described elsewhere [1]. The subsidiary information level is devoted to the association into the basic data structure of additional critical information on: motivations for significant choices, comments, timing and liability data. Such information could be used not only to store the project development history, but also to automatically synthesize implicit interrelations among critical elements of the data structure or of the design process. The integration of such information level into the originally proposed Engineering Knowledge Base architecture is detailed and exemplified, and the adoption of a pre-defined vocabulary of key-words and a syntactic rule interpreter is proposed in order to improve ease of use and effectiveness
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
MIRAGGIO: a System for the Dynamic Management of Product Data and Design Models
No full textAn important aspect in developing “intelligent” CAD systems is related to methodologies which are reliable both in handling the relevant information and in modelling the design processes themselves. The intrinsically dynamic nature of these last makes particularly difficult choosing the most suitable methodology to use. This paper describes a prototype Design System, which is capable of generating and dynamically modifying models of design processes and product data that can be considered as Engineering Knowledge Data Bases. The system, implemented in LPA-Prolog++, is based on a hybrid approach that enforces both the Object-Oriented and the Frame paradigms. Frames are mainly devoted to the implementation of the computational model required by the components involved in the design process, while classes are used to assure the inheritance of properties when objects are instantiated or specialized. Information in the Knowledge Data Base is structured using two types of frames: dataFrames, that support the static computational model of the low level components; and linkFrames, that allow for the collection of the low level components into more complex ones without restraining the activation sequence of the pointed frames. In addition, the management of history slots was added to the system in order to associate to the data and process models, at an atomic level, all information related to the rationale of the choices made. The functionality of the system is presented by means of relevant test cases
Modellazione del Processo di Progettazione in un Ambiente per la Gestione di Basi di Conoscenza
No full textL'evoluzione di sistemi di supporto alla progettazione realmente innovativi, e in particolare di quelli "knowledge driven", non può prescindere dallo sviluppo di strumenti per la gestione delle basi di conoscenza ingegneristica in grado di integrare le diverse informazioni generate o utilizzate e descrivere i processi attivati dal progettista. In un precedente contributo [1] è stato presentato lo schema generale di uno strumento con tali caratteristiche basato sull'utilizzo di "frame" per la modellazione dei dati. Scopo del presente lavoro è quello di illustrare in che modo sia possibile descrivere mediante la schematizzazione prescelta alcuni tipici processi utilizzati nella comune pratica progettuale come, ad esempio, la derivazione di dati da tabelle, la stima e aggiustamento di parametri, ecc.
Come esemplificazione, si farà riferimento al processo di progettazione di una pompa centrifuga a flusso radiale con pale a semplice curvatura
Una proposta per un corso avanzato di grafica computazionale tecnica
No full textIl presente lavoro intende delineare una proposta per un corso avanzato di programmazione/modellazione grafica, da introdurre a conclusione di curricula di ingegneria, che risulti sufficiente a porre un allievo ingegnere in condizione di utilizzare, personalizzare ed eventualmente costruire pacchetti orientati al disegno e alla progettazione assistita, modellatori solidi ed ambienti di sviluppo grafici. Come tale, il corso dovrebbe definire la sintesi di conoscenze acquisite nei campi del disegno e della normativa, della modellazione geometrica, della grafica computazionale, delle metodologie di programmazione e di strutturazione dei dati, della matematica di base, da utilizzare nella personalizzazione o nello sviluppo di ambienti grafici impiegabili in contesti di progettazione
An Engineering Knowledge Base Management Tool for Dynamic Representation of Product Data
No full textThe identification of effective modeling techniques for engineering processes and data representation is a key aspect in the development of Intelligent CAD systems. As an example, in the recently released standard ISO 10303 (STEP) the formal specification language EXPRESS has been introduced in order to represent all the required information. Nevertheless, data schemes based on EXPRESS or other data and/or process models, as E-R, IDEF or NIAM, are static in nature and cannot cope with the intrinsically dynamic and evolutionary nature of the engineering design process; therefore they can be effectively used only at the end of the design process for documentation purposes or for data exchange.
Aim of the present paper is to describe the relevant aspects of a prototypal Engineering Knowledge Base Management Tool for the dynamic generation and modification of process and data models of industrial products, which should be integrated in an Intelligent CAD System.
The Engineering Knowledge Base is implemented in LPA-Prolog++, according to the Object-Oriented and Frame paradigms, and should be intended to assure the tasks of: (a) handling (by addition or deletion) the project’s knowledge components, their relations and system rules; (b) re-mapping of rules/relations consequent to possible changes in the model structure.
Such features are mainly devoted to: (a) automatic/assisted generation of alternative product re-modeling strategies, according to critical aspects as data availability, required user interaction and computational loads; (b) tracking of the project development history
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