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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Grafinės duomenų bazės blokų atributų valdymo sistema / The graphical data base block attribute management system

Lukoševičius, Kęstutis 12 January 2005 (has links)
In the recent two years the analysis of principal and connective circuitry drawings proved that the principal and connective circuitries of very complicated projects are kept in a single file. Therefore, traditional specialized automated design system are not able to build and draw hybrid circuitries with the fragments of electromechanically networks together with the display of sensors and processors. The number of elements in such project files may reach from a few hundred until a few thousand. As this number is so high, the standard AutoCAD means do not quite fulfill the designers’ needs of working with blocks and their attributes. In this way they choose automated means that do not limit their abilities in preparing technical, assembly and tuning documentation, necessary for the completion of the projects. Therefore, based on the master’s paper, in order to fulfill the aforementioned needs, the building of the graphical data base block attribute system management system has been completed. The objective of the paper is the attributes and management of the graphical data base blocks. The purpose of the paper is to create a system of the graphical database attribute management and the means of using it. The purpose is defined by the following tasks: graphic data bases are analyzed; also the graphical data base blocks, their attributes, constituent parts and their management; the means of using the system in the medium of Auto CAD; based on the master’s paper the system of... [to full text]
2

Graphical Data Mining for Computational Estimation in Materials Science Applications

Varde, Aparna S 15 August 2006 (has links)
"In domains such as Materials Science experimental results are often plotted as two-dimensional graphs of a dependent versus an independent variable to aid visual analysis. Performing laboratory experiments with specified input conditions and plotting such graphs consumes significant time and resources motivating the need for computational estimation. The goals are to estimate the graph obtained in an experiment given its input conditions, and to estimate the conditions needed to obtain a desired graph. State-of-the-art estimation approaches are not found suitable for targeted applications. In this dissertation, an estimation approach called AutoDomainMine is proposed. In AutoDomainMine, graphs from existing experiments are clustered and decision tree classification is used to learn the conditions characterizing these clusters in order to build a representative pair of input conditions and graph per cluster. This forms knowledge discovered from existing experiments. Given the conditions of a new experiment, the relevant decision tree path is traced to estimate its cluster. The representative graph of that cluster is the estimated graph. Alternatively, given a desired graph, the closest matching representative graph is found. The conditions of the corresponding representative pair are the estimated conditions. One sub-problem of this dissertation is preserving semantics of graphs during clustering. This is addressed through our proposed technique, LearnMet, for learning domain-specific distance metrics for graphs by iteratively comparing actual and predicted clusters over a training set using a guessed initial metric in any fixed clustering algorithm and refining it until error between actual and predicted clusters is minimal or below a given threshold. Another sub-problem is capturing the relevant details of each cluster through its representative yet conveying concise information. This is addressed by our proposed methodology, DesRept, for designing semantics-preserving cluster representatives by capturing various levels of detail in the cluster taking into account ease of interpretation and information loss based on the interests of targeted users. The tool developed using AutoDomainMine is rigorously evaluated with real data in the Heat Treating domain that motivated this dissertation. Formal user surveys comparing the estimation with the laboratory experiments indicate that AutoDomainMine provides satisfactory estimation."

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