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Mobility modeling and topology prediction in cognitive mobile networksAlshehri, Abdullah 01 July 2012 (has links)
The purpose of this thesis is to analyze a non-intrusive connectivity visualization method for
OLSR-based MANET topology in different mobility models. The visualization relies on the local
topology databases (neighborhood database and topology database) available in OLSR nodes in
the network. Two different views are considered in this method: central view and nodal view. In
the central view, the network topology is viewed from a control center which has access to the
databases of all nodes, while on the other hand, the nodal visualization provides a picture of the
network topology from individual nodes point of view. In this thesis, the full view of the network
has been compared to the nodal view to calculate the error rate for topology discovery, based on
the total numbers of active and undiscovered links.
The main contribution of this thesis is to analyze and improve the accuracy of coarse localization
techniques under different mobility models, using the Force-directed algorithm to calculate the
approximate location of the nodes. The localization information was gathered from layer-3
connectivity, utilizing anchor nodes that are equipped with GPS and other non-GPS nodes instead
of using traditional methods that include received signal strength, time of arrival and angle of
arrival. The approximate location information of the nodes derived from this technique has been
compared with original node location in order to determine the accuracy of this technique. To
improve the accuracy, several mobility prediction filters such as moving average filter, Kalman
filter and low pass filter have been applied to the approximate location data. The simulation is
done to calculate the error between the original location data and the coarse approximations, and
the results shows that Moving Average provides the best results. / UOIT
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Optical Filter Design: Gain Analysis and Tolerance AnalysisVandrasi, Vivek 2010 August 1900 (has links)
Three components, gain analysis, tolerance analysis in-depth, and a brief non-
linearity analysis, are presented. In the first component, the effects of an Erbium
doped waveguide amplifier in a microring are investigated using a time domain simulation. Methods to simulate the gain versus average input signal power in the microring are studied, given that it has a long lifetime compared to the short delay time of
the microring. The methods are based on the dependence of the gain on the power
of the signal being fed to the ring.
An algorithm is proposed to perform a thorough tolerance analysis on any optical
circuit with respect to any optical parameter. The algorithm, based on Monte Carlo
Simulation, is implemented on a complex optical circuit that is designed to obtain a
bandpass filter response of given specifications. It is also tested on similar designs for
a comparative study between them. The parameters and the structure of the designs
used for the analysis are presented in detail. The results are presented in terms of
the yield with respect to the parameter being varied, against their tolerance value.
Algorithms for studying the effects of two types of non-linearities are presented.
The Kerr nonlinearity and the two-photon absorption are included in the bandpass filter designs used for the tolerance analysis. The algorithms are based on the power
circulating in different regions of the circuit under consideration. The variation in
the original response because of the loss due to nonlinearity is observed and analyzed
for different power levels of the input signal.
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Multi-rank wavelet filtersLeung, Hung-kwan. January 2001 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2001. / Includes bibliographical references (leaves 80-81).
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Chemical-enhanced filtration of Cu/Ni concentrateZheng, Haijun. January 2010 (has links)
Thesis (M. Sc.)--University of Alberta, 2010. / Title from pdf file main screen (viewed on Jan. 21, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science, Department of Chemical and Materials Engineering, University of Alberta. Includes bibliographical references.
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PIC 18F452 implementation of digital filtersBose-Mullick, Vikram A. January 1900 (has links)
Thesis (M.S.)--West Virginia University, 2004. / Title from document title page. Document formatted into pages; contains xiii, 148 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 97-98).
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Biofiltration of volatile organic compounds using fungal-based bioreactorsWoertz, Jennifer Renee. Kinney, Kerry A., January 2002 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2002. / Supervisor: Kerry A. Kinney. Vita. Includes bibliographical references. Also available from UMI.
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Design of analog baseband circuits for wireless communication receiversYoo, Seoung-Jae, January 2004 (has links)
Thesis (Ph. D.)--Ohio State University, 2004. / Title from first page of PDF file. Document formatted into pages; contains xvi, 167 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Mohammed Ismail ElNaggar, Dept. of Electrical Engineering. Includes bibliographical references (p. 163-167).
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Low sensitivities and roundoff noise digital oscillators and filters design /Lee, Wah-ching. January 1987 (has links)
Thesis (M. Phil.)--University of Hong Kong, 1988.
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High speed realisation of digital filters /Tsim, Man-tat, Jimmy. January 1989 (has links)
Thesis (M. Phil.)--University of Hong Kong, 1989.
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Non-uniform filter banks and context modeling for image coding /Ho, Man-wing. January 2001 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2002. / Includes bibliographical references (leaves 90-94).
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