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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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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.
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Showing 921 to 930 of 949 (0.058 seconds)| 921 |
Modelling of Mobile Fading Channels with Fading Mitigation Techniques.Shang, Lei, lei.shang@ieee.org January 2006 (has links)
This thesis aims to contribute to the developments of wireless communication systems. The work generally consists of three parts: the first part is a discussion on general digital communication systems, the second part focuses on wireless channel modelling and fading mitigation techniques, and in the third part we discuss the possible application of advanced digital signal processing, especially time-frequency representation and blind source separation, to wireless communication systems. The first part considers general digital communication systems which will be incorporated in later parts. Today's wireless communication system is a subbranch of a general digital communication system that employs various techniques of A/D (Analog to Digital) conversion, source coding, error correction, coding, modulation, and synchronization, signal detection in noise, channel estimation, and equalization. We study and develop the digital communication algorithms to enhance the performance of wireless communication systems. In the Second Part we focus on wireless channel modelling and fading mitigation techniques. A modified Jakes' method is developed for Rayleigh fading channels. We investigate the level-crossing rate (LCR), the average duration of fades (ADF), the probability density function (PDF), the cumulative distribution function (CDF) and the autocorrelation functions (ACF) of this model. The simulated results are verified against the analytical Clarke's channel model. We also construct frequency-selective geometrical-based hyperbolically distributed scatterers (GBHDS) for a macro-cell mobile environment with the proper statistical characteristics. The modified Clarke's model and the GBHDS model may be readily expanded to a MIMO channel model thus we study the MIMO fading channel, specifically we model the MIMO channel in the angular domain. A detailed analysis of Gauss-Markov approximation of the fading channel is also given. Two fading mitigation techniques are investigated: Orthogonal Frequency Division Multiplexing (OFDM) and spatial diversity. In the Third Part, we devote ourselves to the exciting fields of Time-Frequency Analysis and Blind Source Separation and investigate the application of these powerful Digital Signal Processing (DSP) tools to improve the performance of wireless communication systems.
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| 922 |
Intimate Partner Violence Predictors in an International Context: An Analysis of the International Violence against Women SurveyForrester, Trina K. 21 April 2011 (has links)
Using the International Violence Against Women Survey (IVAWS), this paper identifies factors contributing to women’s individual risk of being victimized by their current intimate partner. Additionally, this analysis examines the overlap of physical and sexual violence within intimate relationships. Past research into IPV has identified a numerous predictor variables. Adapting nine such variables (controlling behaviours, male heavy drinking, female only income, female past marriage, female past IPV, respondents’ age, relationship duration, relationship status and violence outside the home) to the IVAWS dataset, a framework identifying risk patterns for physical and sexual violence was developed. The results identify a number of variables that performed as expected and increased a women’s risk of being a victim of IPV; however, some variables decreased women’s risk and therefore acted as protective factors. These findings suggest that IPV at the country level is more complex and requires additional research to fully explain the variation observed.
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| 923 |
Intimate Partner Violence Predictors in an International Context: An Analysis of the International Violence against Women SurveyForrester, Trina K. 21 April 2011 (has links)
Using the International Violence Against Women Survey (IVAWS), this paper identifies factors contributing to women’s individual risk of being victimized by their current intimate partner. Additionally, this analysis examines the overlap of physical and sexual violence within intimate relationships. Past research into IPV has identified a numerous predictor variables. Adapting nine such variables (controlling behaviours, male heavy drinking, female only income, female past marriage, female past IPV, respondents’ age, relationship duration, relationship status and violence outside the home) to the IVAWS dataset, a framework identifying risk patterns for physical and sexual violence was developed. The results identify a number of variables that performed as expected and increased a women’s risk of being a victim of IPV; however, some variables decreased women’s risk and therefore acted as protective factors. These findings suggest that IPV at the country level is more complex and requires additional research to fully explain the variation observed.
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| 924 |
Display and Manipulation of Inventory DataGale, R. D., Russel, J. W., Siverts, L. E. 20 April 1974 (has links)
From the Proceedings of the 1974 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 19-20, 1974, Flagstaff, Arizona / A stochastic model is presented for the prediction of sediment yield in a semi-arid watershed based on rainfall data and watershed characteristics. Random variables which lead to uncertainty in the model are rainfall amount, storm duration, runoff, and peak flow. Soil conservation service formulas are used to compute the runoff and peak flow components of the universal soil loss equation, and a transformation of random variables is used to obtain the distribution function of sediment yield from the joint distribution of rainfall amount and storm duration. Applications of the model are in the planning of reservoirs and dams where the effective lifetime of the facility may be evaluated in terms of storage capacity as well as the effects of land management of the watershed. In order to calibrate the model and to evaluate the uncertainties involved, experimental data from the Atterbury watershed near Tucson, Arizona were used.
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| 925 |
NaV1.5 Modulation: From Ionic Channels to Cardiac Conduction and Substrate HeterogeneityRaad, Nour 16 January 2014 (has links)
No description available.
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| 926 |
Intimate Partner Violence Predictors in an International Context: An Analysis of the International Violence against Women SurveyForrester, Trina K. 21 April 2011 (has links)
Using the International Violence Against Women Survey (IVAWS), this paper identifies factors contributing to women’s individual risk of being victimized by their current intimate partner. Additionally, this analysis examines the overlap of physical and sexual violence within intimate relationships. Past research into IPV has identified a numerous predictor variables. Adapting nine such variables (controlling behaviours, male heavy drinking, female only income, female past marriage, female past IPV, respondents’ age, relationship duration, relationship status and violence outside the home) to the IVAWS dataset, a framework identifying risk patterns for physical and sexual violence was developed. The results identify a number of variables that performed as expected and increased a women’s risk of being a victim of IPV; however, some variables decreased women’s risk and therefore acted as protective factors. These findings suggest that IPV at the country level is more complex and requires additional research to fully explain the variation observed.
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| 927 |
An Urban Rainfall Storm Flood Severity IndexJobin, Erik 08 May 2013 (has links)
Extreme rainfall statistics are important for the design and management of the water resource infrastructure. The standard approach for extreme rainfall event severity assessment is the Intensity-Duration-Frequency (IDF) method. However, this approach does not consider the spatial context of rainfall and consequently does not properly describe rainfall storm severity, nor rarity. This study provides a critical account of the current standard practice and presents an approach that takes into consideration both the spatial context of rainfall storms, and indirectly incorporates runoff to produce a representative approach to assessing urban rainfall storm severity in terms of flood potential. A stepwise regression analysis was performed on a dataset of individual rainfall storm characteristics to best represent documented basement floodings in the City of Edmonton. Finally, the urban rainfall storm flood severity index was shown to be most representative of the documented basement floodings' severity when compared to that of the IDF method.
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| 928 |
Intimate Partner Violence Predictors in an International Context: An Analysis of the International Violence against Women SurveyForrester, Trina K. January 2011 (has links)
Using the International Violence Against Women Survey (IVAWS), this paper identifies factors contributing to women’s individual risk of being victimized by their current intimate partner. Additionally, this analysis examines the overlap of physical and sexual violence within intimate relationships. Past research into IPV has identified a numerous predictor variables. Adapting nine such variables (controlling behaviours, male heavy drinking, female only income, female past marriage, female past IPV, respondents’ age, relationship duration, relationship status and violence outside the home) to the IVAWS dataset, a framework identifying risk patterns for physical and sexual violence was developed. The results identify a number of variables that performed as expected and increased a women’s risk of being a victim of IPV; however, some variables decreased women’s risk and therefore acted as protective factors. These findings suggest that IPV at the country level is more complex and requires additional research to fully explain the variation observed.
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| 929 |
An Urban Rainfall Storm Flood Severity IndexJobin, Erik January 2013 (has links)
Extreme rainfall statistics are important for the design and management of the water resource infrastructure. The standard approach for extreme rainfall event severity assessment is the Intensity-Duration-Frequency (IDF) method. However, this approach does not consider the spatial context of rainfall and consequently does not properly describe rainfall storm severity, nor rarity. This study provides a critical account of the current standard practice and presents an approach that takes into consideration both the spatial context of rainfall storms, and indirectly incorporates runoff to produce a representative approach to assessing urban rainfall storm severity in terms of flood potential. A stepwise regression analysis was performed on a dataset of individual rainfall storm characteristics to best represent documented basement floodings in the City of Edmonton. Finally, the urban rainfall storm flood severity index was shown to be most representative of the documented basement floodings' severity when compared to that of the IDF method.
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| 930 |
Work-Integrated Learning in Closing Skills Gap in Public Procurement: A Qualitative Phenomenological StudyCulver, Allen Lea 08 December 2021 (has links)
No description available.
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