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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

Erfassung der Schadensentwicklung von mineralischen Baustoffen mit Hilfe der Ultraschallphasenspektroskopie

Ruck, Hans-Jürgen, January 2005 (has links)
Stuttgart, Univ., Diss., 2005.
2

Fast computation tools for adaptive wavelet schemes

Barinka, Arne January 2005 (has links) (PDF)
Aachen, Techn. Hochsch., Diss., 2005
3

Automatic ECG analysis using principal component analysis and wavelet transformation

Khawaja, Antoun January 2006 (has links)
Zugl.: Karlsruhe, Univ., Diss., 2006
4

Automatic ECG analysis using principal component analysis and wavelet transformation

Khawaja, Antoun January 2006 (has links)
Zugl.: Karlsruhe, Univ., Diss., 2006
5

A Hierarchical On-Line Path Planning Scheme using Wavelets

Bakolas, Efstathios 02 April 2007 (has links)
The main objective of this thesis is to present a new path planning scheme for solving the shortest (collision-free) path problem for an agent (vehicle) operating in a partially known environment. We present two novel algorithms to solve the planning problem. For both of these approaches we assume that the agent has detailed knowledge of the environment and the obstacles only in the vicinity of its current position. Far away obstacles or the final destination are only partially known and may even change dynamically at each instant of time. The path planning scheme is based on information gathered on-line by the available on-board sensor devices. The solution minimizes the total length of the path with respect to a metric that includes actual path length, along with a risk-induced metric. In order to obtain an approximation of the whole configuration space at different levels of fidelity we use a wavelet approximation scheme. In the first proposed algorithm, the path-planning problem is solved using a multi-resolution cell decomposition of the environment obtained from the wavelet transform. In the second algorithm, we extend the results of the the first one by using the multiresolution representation of the environment in conjunction with a conformal mapping to polar coordinates. By performing the cell decomposition in polar coordinates, we can naturally incorporate sector-like cells that are adapted to the data representation collected by the on-board sensor devices.
6

Novel techniques for fault location, voltage profile calculation and visualization of transients

Evrenosoglu, Cansin Yaman 15 May 2009 (has links)
This dissertation addresses three different problems in power systems. The first problem is related to the fault location in complex topologies such as three terminal circuits with series compensation and mutually coupled line sections and distribution networks with distributed generation. Novel methods are presented by using traveling wave approach and wavelet transformation technique to overcome the difficulties introduced by the discontinuities and integrated components such as Metal Oxide Varistor (MOV) protected series capacitors and distributed generation in complex topologies. Simulation results show good correlation between the actual and estimated fault locations for all the studied cases. The second problem concerns the calculation techniques of voltage profiles along transmission lines. A simple yet effective approach to accurately and rapidly obtain the voltage profile along a transmission line during fault transients is presented. The objective of the presented method is to eliminate the need to use wave equations and line parameters provided that an electromagnetic Transients Program (EMTP) type transients simulator is available for generating bus voltage transients for a given fault. This is accomplished by developing a time series model to estimate the voltage at an intermediate point along the transmission line. The model is formed for each intermediate point separately. Once the model is obtained it can be used to predict the transient voltage at that point along the line during any fault in the system. The approach can potentially be useful as a post processor to a transient simulator and can be used by developers of transient animations and movies for illustrating fault-initiated propagation of traveling waves in power systems. The third problem is the lack of powerful visualization and animation methods, which can help understanding the complex behavior of power systems during transients. The goal of this part of the dissertation is to develop new animation and visualization methods for power system electromagnetic transients for both educational and research purposes. Proposed approaches are implemented in different environments such as MATLAB and Microsoft Visual Studio to show the effectiveness of two and three-dimensional visualization of power system transients. The implementations of the proposed methods provide better understanding of the power systems during transient phenomena due to the faults or switchings.
7

Nichtstationäre Filterung mit Hilfe analytischer wavelet packets am Beispiel von Sprachsignalen

Weickert, Thomas January 2008 (has links)
Zugl.: Karlsruhe, Univ., Diss., 2008 / Hergestellt on demand
8

Robuste Risiko-Optimierung mit multi-objective neural networks /

Prescher, Martin. January 2008 (has links)
Zugl.: München, Universiẗat der Bundeswehr, Diss.
9

Multivariante Adaption mit modularisierten künstlichen neuronalen Netzen

Sartorius, Gerhard January 2009 (has links)
Zugl.: Hagen, Fernuniv., Diss., 2009
10

Parallele Berechnung der Wavelet-Transformation auf Grafikhardware /

Wippig, Dietmar. January 2009 (has links)
Zugl.: Hamburg, Techn. Universiẗat, Diss., 2009.

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