Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 50 for “"Kohonen"”.
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Seasonality of circulation in southern Africa using the Kohonen self-organising map
… employing the classification capabilities of the Kohonen self-organising map (SOM) is introduced into the body of computer-based techniques available to synoptic climatology. The SOM is one of many types of artificial neural networks (ANN) and is capable of unsupervised learning or non-linear …
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Brain-machine interface coupled cognitive sensory fusion with a Kohonen and reservoir computing scheme
… incorporated self-organizing processes - i.e. Kohonen maps, hidden Markov models for the speech, language development and emotional information via neural data - to help lay the substrate for emergence. Next, homage is given to the central and unique role played in intellectual study by …
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A graphical, self-organizing approach to classifying electronic meeting output.
… research in the application and evaluation of a Kohonen Self-Organizing Map (SOM) to the problem of classification of Electronic Brainstorming output. Electronic Brainstorming is one of the most productive tools in the Electronic Meeting System called GroupSystems. A major step in group problem …
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Prediction of Fatigue Life in 7075-T6 Aluminum from Neural Network Analysis of Acoustic Emission Data
… emission (AE) data acquisition system, a Kohonen self-organizing map, and a back-propagation neural network, AE data from 7075-T6 aluminum specimens were used to classify failure mechanisms and predict the number of fatigue cycles to failure. AE waveforms were captured from 40 notched …
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Neural Network Fatigue Life Prediction in 7075-T6 Aluminum from Acoustic Emission Data
… An AE data acquisition system coupled with a Kohonen self organizing map and a back propagation neural network were used to perform the analysis. AE waveforms were recorded during fatigue cycling of twenty-four notched 7075-T6 aluminum specimens using broad-band piezoelectric transducers. A …
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Neural Network Detection of Fatigue Crack Growth in Riveted Joints Using Acoustic Emission
… onto a two-dimensional feature space using a Kohonen self organizing map (SOM). Then 132 crack growth and 137 rivet rubbing spectra were used to train a back-propagation neural network to provide automatic pattern classification. Although there was some overlap between the clusters mapped in …
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Ultimate Compression After Impact Load Prediction in Graphite/Epoxy Coupons Using Neural Network and Multivariate Statistical Analyses
… of impact damaged graphite/epoxy coupons using a Kohonen self-organizing map (SOM) neural network and multivariate statistical regression analysis (MSRA). An optimized use of these data treatment tools allowed the generation of a simple, physically understandable equation that predicts the …
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Neural Networks Satisfying Stone-weiestrass Theorem And Approximating
… or Bezier surfaces. Hoffman and Varady used Kohonen neural networks to construct appropriate grids. This thesis is concerned with two types of neural networks viz. those which satisfy the conditions of the Stone-Weierstrass theorem and Kohonen neural networks. We have used self-organizing …
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Compresion de la base de datos para sintesis voz visual
… imágenes empleando mapas de autoorganización de Kohonen (SOFM), las cuales se les realizo tres barridos diferentes con el fin de generar secuencias con transiciones entre imágenes más suaves.
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Ultimate Strength Prediction in Fiberglass/Epoxy Beams Subjected to Three-Point Bending Using Acoustic Emission and Neural Networks
… <p>A second analysis was performed using a Kohonen self organizing map and multivariate statistical analysis. A Kohonen self organizing map was utilized to classify the AE data into 4 failure mechanisms. Then multivariate statistical analysis was performed using the number of hits associated …
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Adaptación y aplicación de la transformada de Hilbert-Huang a sistemas eléctricos: aplicaciones en el estudio de la gestión de la demanda y caracterización de transitorios
… artificial como los mapas auto-organizados de Kohonen. [ENG] Thesis uses as a basis the Hilbert-Huang transform to develop several tools that allow to characterize different sampled data related to electrical engineering. In the document, a review of conventional analysis techniques is …
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Nuevos algoritmos de entrenamiento y visualización de redes neuronales autoorganizativas para su aplicación en teledetección
… concretamente el modelo planteado por Kohonen, ha demostrado ser una herramienta versátil y útil en el análisis exploratorio de datos. El modelo de Kohonen presenta ciertas limitaciones relacionadas principalmente con su arquitectura, lo que ha hecho surgir nuevos tipos de mapas …
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Fuzzy neural networks
… feedforward network, CMAC, Hopfield network, Kohonen network) have been developed to aid in the solution of these problems. In this paper, we are interested in the feedforward network.
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The use of artificial intelligence techniques to assist in the valuation of residential properties
… The first, using a technique known as the Kohonen Self Organising Map, makes an assumption that residential properties that share sufficient characteristics can be appraised using the same function The Kohonen Self Organising Map is used to cluster properties with respect to their property …
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Desarrollo e implementación de procesos de vigilancia tecnológica asociados al estudio de los ciclos biogeoquímicos e hidrológico
… volúmenes de información usando el algoritmo de Kohonen, que ya ha sido usado en el país, para la detección de arritmias cardiacas, la clasificación de aminoácidos, segmentación psicográfica, identificación de patrones económicos, y la identificación de descargas atmosféricas. No obstante, este …
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Acoustic Emission Signal Classification for Gearbox Failure Detection
… best. The clustering algorithms utilized are the Kohonen Self-organizing Map (SOM), k-mean and Gaussian Mixture Model (GMM). From the clustering iterations, the three cluster criterion algorithms were performed to observe the suggested optimal number of cluster by the criterions. The three …
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Seleção de genótipos de eucalipto para produção de carvão vegetal utilizando análise multivariada e redes neurais
… média entre grupos (UPGMA) e rede neural de Kohonen. Observou-se que a metodologia de pré- classificação foi eficiente, permitindo a escolha de 16 genótipos com valores desejáveis para as quatro características utilizadas na pré-seleção. De modo geral, as propriedades da madeira e carvão …
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Classification of Acoustic Emission Signals from an Aluminum Pressure Vessel Using a Self-Organizing Map
… spectrum was calculated for each waveform. A Kohonen self-organizing map (SOM) was used to cluster the spectra. The network clustered the data on a two-dimensional feature space according to the source of the signal. A total of 3,600 power spectra were used to train the neural network, and …
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Low Proof Load Prediction of Ultimate Strengths of Fiberglass/Epoxy I-Beams Using Acoustic Emission
… ultimate load for further analysis.</p> <p>A Kohonen self-organizing map was utilized to separate each individual data point (hit) into failure mechanism clusters. Then a multiple linear regression analysis was performed using the percentage of hits associated with each failure mechanism along …
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Αυτόματη ταυτοποίηση βιομετρικών χαρακτηριστικών : εφαρμογή στα δακτυλικά αποτυπώματα
… του Δικτύου Αυτό-Οργανούμενων Δικτύων του Kohonen και του ορισμού των σημείων μικρολεπτομερειών των αποτυπωμάτων ως νευρώνων του δικτύου. Επιπλέον, ιδιαίτερη βαρύτητα δόθηκε στην προεπεξεργασία των εικόνων των δακτυλικών αποτυπωμάτων βάσει της ανάπτυξης και εφαρμογής κατάλληλων τεχνικών …
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