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Dissertations / Theses on the topic 'Distortion performance'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Mbabele, Modeste. "Intermodulation distortion performance enhancement of microwave power amplifiers." Thesis, Brunel University, 2000. http://bura.brunel.ac.uk/handle/2438/5440.

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This thesis reports the author's investigation of the effects of the injection of specific signals on the intermodulation distortion performance of microwave power amplifiers. Theory, simulation and practical results are presented, analysed and compared. The thesis gives the reader background knowledge of power amplifiers and their nonlinearities and go on to analyse the phenomena of intermodulation distortion product generation in power amplifiers. The analysis is based on a three-tone test since this highlights a second kind of third order intermodulation distortion (IMD3), which are in gene

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2

Papamarkos, Ioannis. "Inlet distortion generation for a transonic compressor." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Sep%5FPapamarkos.pdf.

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3

Lucas, James Redmond. "Effect of BLI-Type Inlet Distortion on Turbofan Engine Performance." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/23272.

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Boundary Layer Ingestion (BLI) is currently being researched as a potential method to improve efficiency and decrease emissions for the next generation of commercial aircraft. While re-energizing the boundary layer formed over the fuselage of an aircraft has many system level benefits, ingesting the low velocity boundary layer flow through a serpentine inlet into a turbofan engine adversely affects the performance of the engine. The available literature has only yielded studies of the effects of this specific type of inlet distortion on engine performance in the form of numerical simulations

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4

McGuinness, Christopher. "Characterizing Remote Sensing Data Compression Distortion for Improved Automated Exploitation Performance." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1524844209730534.

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5

MacLeod, Brenda Brennan 1971. "Effect of a sinusoidal three-lobe total pressure distortion on a transonic compressor : distortion propagation, compressor performance, and blade passage events." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/82772.

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6

O'Brien, Daniel Gerard, and n/a. "Broadband matching and distortion performance relating to multiple subcarrier multiplexed photonic systems." University of Canberra. Information Sciences & Engineering, 1992. http://erl.canberra.edu.au./public/adt-AUC20060821.095055.

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This thesis describes the outcome of study to investigate methods of broadband matching to photonic devices such as lasers and high speed detectors. The thesis is divided into two areas of interest relating to the design of broadband fiber optic links. The first area is the application of numerical methods and commensurate line methods to the design of compact equalisers which allow an improved transducer power gain over a wide band. It is shown that physically small equalisers can yield an improvement of 4 dB over a 2 GHz bandwidth. The second area considered is the distortion inherent in a l

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7

Firm, Richard. "Mechanical distortion and performance associated with cylindrical components in diesel injector systems." Thesis, University of Bath, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392055.

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As European and US vehicle emissions regulations tighten, more effective methods of reducing diesel engines pollutants must be devised. Increasing the injection pressure results in smaller fuel droplets and consequently more efficient combustion with a reduction in emissions output. However, to gain acceptable levels of NO. and particulates, required pressures must be of the order of 1800 to 2400 bar. At this level the components within the diesel injector and pump experience an appreciable level of distortion, that can, in severe cases, lead to leakage and a loss in pumping efficiency. It is

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8

Smurzynski, Jacek. "Frequency Modulated Distortion-product Otoacoustic Emission (FMDPOAE) Tests Aimed for Improving Diagnostic Performance." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etsu-works/2220.

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9

Guerreiro, João Francisco Martinho Lêdo. "Maximum likelihood detection for OFDM signals with strong nonlinear distortion effects." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/7983.

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10

Häger, Emil. "Performance Evaluation of Medium-Power Voltage Inverters." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118568.

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Power inverters, used to convert DC power to AC, are often used in e.g. solar power applications. However, they tend to be impractically large and expensive; as such, power miniaturization is an active research area. In this thesis, several classes of modern power inverters are evaluated and compared with regards to size, efficiency and output quality in order to identify areas of potential improvement. Methods for estimation of THD, power losses and input ripple are created and verified against a simulation of a five-level neutral-point-clamped inverter with SPWM control. Finally, this design

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11

Filipkowski, Jenna Noelle. "Impression Management across Applicant and Incumbent Contexts: The Effect on Job Performance." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1334170063.

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12

Gray, Ashley A. "An investigation of the effects of perceived feedback accuracy on performance." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001719.

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13

Sujudi, David D. (David Dewantara). "An experimental investigation of the effects of inlet circumferential temperature distortion on the aerodynamic performance of a single stage turbine." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/11912.

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14

Tian, Yunjia. "Theory based on device current clipping to explain and predict performance including distortion of power amplifiers for wireless communication systems." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/1414.

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Power amplifiers are critical components in wireless communication systems that need to have high efficiency, in order to conserve battery life and minimise heat generation, and at the same time low distortion, in order to prevent increase of bit error rate due to constellation errors and adjacent channel interference. This thesis is aimed at meeting a need for greater understanding of distortion generated by power amplifiers of any technology, in order to help designers manage better the trade-off between obtaining high efficiency and low distortion. The theory proposed in this thesis to expl

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15

Leung, Raymond Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Scalable video compression with optimized visual performance and random accessibility." Awarded by:University of New South Wales. Electrical Engineering and Telecommunications, 2006. http://handle.unsw.edu.au/1959.4/24192.

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This thesis is concerned with maximizing the coding efficiency, random accessibility and visual performance of scalable compressed video. The unifying theme behind this work is the use of finely embedded localized coding structures, which govern the extent to which these goals may be jointly achieved. The first part focuses on scalable volumetric image compression. We investigate 3D transform and coding techniques which exploit inter-slice statistical redundancies without compromising slice accessibility. Our study shows that the motion-compensated temporal discrete wavelet transform (MC-TDWT)

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16

Ozkilic, Sibel. "Performance Improvement Of A 3-d Configuration Reconstruction Algorithm For An Object Using A Single Camera Image." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1095793/index.pdf.

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Performance improvement of a 3-D configuration reconstruction algorithm using a passive secondary target has been focused in this study. In earlier studies, a theoretical development of the 3-D configuration reconstruction algorithm was achieved and it was implemented by a computer program on a system consisting of an optical bench and a digital imaging system. The passive secondary target used was a circle with two internal spots. In order to use this reconstruction algorithm in autonomous systems, an automatic target recognition algorithm has been developed in this study. Starting from a

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17

Novikov, Yaroslav. "Development Of A High-fidelity Transient Aerothermal Model For A Helicopter Turboshaft Engine For Inlet Distortion And Engine Deterioration Simulations." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614389/index.pdf.

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Presented in this thesis is the development of a high-fidelity aerothermal model for GE T700 turboshaft engine. The model was constructed using thermodynamic relations governing change of flow properties across engine components, and by applying real component maps for the compressor and turbines as well as empirical relations for specific heats. Included in the model were bleed flows, turbine cooling and heat sink effects. Transient dynamics were modeled using inter-component volumes method in which mass imbalance between two engine components was used to calculate the inter-component pressur

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18

Seth, Sachin. "Using complementary silicon-germanium transistors for design of high-performance rf front-ends." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44721.

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The objective of the research presented in this dissertation is to explore the achievable dynamic range limits in high-performance RF front-ends designed using SiGe HBTs, with a focus on complementary (npn + pnp) SiGe technologies. The performance requirements of RF front-ends are high gain, high linearity, low dc power consumption, very low noise figure, and compactness. The research presented in this dissertation shows that all of these requirements can easily be met by using complementary SiGe HBTs. Thus, a strong case is made in favor of using SiGe technologies for designing high dynamic r

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19

Zhao, Zhanlue. "Performance Appraisal of Estimation Algorithms and Application of Estimation Algorithms to Target Tracking." ScholarWorks@UNO, 2006. http://scholarworks.uno.edu/td/394.

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This dissertation consists of two parts. The first part deals with the performance appraisal of estimation algorithms. The second part focuses on the application of estimation algorithms to target tracking. Performance appraisal is crucial for understanding, developing and comparing various estimation algorithms. In particular, with the evolvement of estimation theory and the increase of problem complexity, performance appraisal is getting more and more challenging for engineers to make comprehensive conclusions. However, the existing theoretical results are inadequate for practical r

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20

Kilic, Varlik. "Performance Improvement Of A 3d Reconstruction Algorithm Using Single Camera Images." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606259/index.pdf.

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In this study, it is aimed to improve a set of image processing techniques used in a previously developed method for reconstructing 3D parameters of a secondary passive target using single camera images. This 3D reconstruction method was developed and implemented on a setup consisting of a digital camera, a computer, and a positioning unit. Some automatic target recognition techniques were also included in the method. The passive secondary target used is a circle with two internal spots. In order to achieve a real time target detection, the existing binarization, edge detection, and ellipse

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21

Clark, Adam. "Predicting the Crosswind Performance of High Bypass Ratio Turbofan Engine Inlets." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1476265135449178.

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22

Mollén, Christopher. "High-End Performance with Low-End Hardware : Analysis of Massive MIMO Base Station Transceivers." Doctoral thesis, Linköpings universitet, Kommunikationssystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-143455.

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Massive MIMO (multiple-input–multiple-output) is a multi-antenna technology for cellular wireless communication, where the base station uses a large number of individually controllable antennas to multiplex users spatially. This technology can provide a high spectral efficiency. One of its main challenges is the immense hardware complexity and cost of all the radio chains in the base station. To make massive MIMO commercially viable, inexpensive, low-complexity hardware with low linearity has to be used, which inherently leads to more signal distortion. This thesis investigates how the deg

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23

Souza, Lafranckia Saraiva Paz de. "O ensino médio regular noturno em Manaus: indicadores do rendimento escolar." Universidade Federal de Juiz de Fora (UFJF), 2016. https://repositorio.ufjf.br/jspui/handle/ufjf/4658.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-05-25T15:14:34Z No. of bitstreams: 1 lafranckiasaraivapazdesouza.pdf: 937352 bytes, checksum: e266c73a116b735f44a077c3ee8a0ba9 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-05-25T15:15:41Z (GMT) No. of bitstreams: 1 lafranckiasaraivapazdesouza.pdf: 937352 bytes, checksum: e266c73a116b735f44a077c3ee8a0ba9 (MD5)<br>Made available in DSpace on 2017-05-25T15:15:41Z (GMT). No. of bitstreams: 1 lafranckiasaraivapazdesouza.pdf: 937352 bytes, checksum: e266c73a116b735f44a077c3ee8a0ba9 (M

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24

Svanberg, J. Magnus. "Predictions of manufacturing induced shape distortions : high performance thermoset composites." Doctoral thesis, Luleå tekniska universitet, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25822.

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High performance composites usually consist of continuous fibres and a thermoset matrix. A well-known example is carbon fibre epoxy composites. When this kind of material is cured residual stresses and/or shape distortions are produced owing to thermally and chemically induced volumetric strains. The cure means the manufacturing step where the thermoset matrix is transformed from a liquid to a solid material. It is a quite complex thermal- chemical- mechanical process that in addition to volumetric strains, involves heat generation and dramatic changes in mechanical properties. For manufactu

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25

Alberto, Rita Sofia Grácio. "Gender distorting genre distorting gender : exploring women's rock musicking practices in contemporary Portugal." Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/33397.

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This work explores the everyday uses of rock music by women rock musicians, fans and DJs (amateurs), in a specific place (Portugal) and time (1990s-2014). Drawing on the work in the two main fields of music sociology and gender studies and its performative perspective to both gender and music (but also taking contributions from techno-feminist studies, science and technology studies, sociology of work, leisure and sports), this research takes a ‘music-in-action’ approach. This approach understands music as a social activity, as a network of connections between people, materials, discourses and

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26

Thiele, Veikko. "Essays on incongruent preferences for effort allocations in multi-task agency relations." Doctoral thesis, Humboldt-Universität zu Berlin, Wirtschaftswissenschaftliche Fakultät, 2006. http://www.gbv.de/dms/zbw/523228546.pdf.

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27

Xu, Xiao. "Harmonic modelling and characterisation of modern power electronic devices in low voltage networks." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/33106.

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Although the overall levels of harmonics in modern power supply systems are in most of the practical cases still below the prescribed tolerance limits and thresholds (e.g. these stipulated in [IEC 61000-3-2 and 61000-3-12]), the sources of harmonics are constantly increasing in numbers and are expected to increase even more in the future. Some of the examples of modern non-linear power electronic (PE) devices that are expected to be employed on a much wider scale in LV networks in the future include: light-emitting diode (LED) lamps, switched-mode power supplies (SMPS'), electric vehicle batte

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28

Shahosseini, Iman. "Vers des micro-haut-parleurs à hautes performances électroacoustiques en technologie silicium." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00856591.

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Ce mémoire présente la conception, la réalisation et la caractérisation d'un micro-haut-parleur en silicium destiné à des applications électroniques portables, telles que les tablettes et les téléphones cellulaires. L'objectif est d'évaluer le potentiel des microtechnologies pour améliorer la qualité sonore et le rendement électroacoustique, qui sont deux points faibles majeurs des micro-haut-parleurs actuels.En analysant les paramètres dont dépendent le rendement et la qualité sonore, nous montrons que le silicium monocristallin présente des propriétés particulièrement intéressantes pour réal

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29

Khouz, Boujemaa. "Etude de la réduction de l'usure dans un lubrifiant contaminé par des particules." Ecully, Ecole centrale de Lyon, 1987. http://www.theses.fr/1987ECDL0004.

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30

Datsiou, Kyriaki Corinna. "Design and performance of cold bent glass." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/269408.

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The demand for flat glass is high and increasing significantly in the building industry as a direct result of architectural requirements for lightness, transparency and natural light. Current architectural trends require glass in curvilinear forms for smooth free-form façades. Two principal challenges arise from this: to cost-effectively produce the desired curvature and; to ensure its safe performance after exposure to ageing. The recent availability of high strength glass provides an opportunity to address the first challenge by developing cold bent glass. Cold bending involves the strainin

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31

Cheng, Shanshan. "Fire performance of cold-formed steel sections." Thesis, University of Plymouth, 2015. http://hdl.handle.net/10026.1/3316.

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Thin-walled cold-formed steel (CFS) has exhibited inherent structural and architectural advantages over other constructional materials, for example, high strength-to-weight ratio, ease of fabrication, economy in transportation and the flexibility of sectional profiles, which make CFS ideal for modern residential and industrial buildings. They have been increasingly used as purlins as the intermediate members in a roof system, or load-bearing components in low- and mid-rise buildings. However, using CFS members in building structures has been facing challenges due to the lack of knowledge to th

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32

Chatterjee, Saikat. "Rate-Distortion Performance And Complexity Optimized Structured Vector Quantization." Thesis, 2008. http://hdl.handle.net/2005/1056.

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Although vector quantization (VQ) is an established topic in communication, its practical utility has been limited due to (i) prohibitive complexity for higher quality and bit-rate, (ii) structured VQ methods which are not analyzed for optimum performance, (iii) difficulty of mapping theoretical performance of mean square error (MSE) to perceptual measures. However, an ever increasing demand for various source signal compression, points to VQ as the inevitable choice for high efficiency. This thesis addresses all the three above issues, utilizing the power of parametric stochastic modeling of

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33

Yu, Hao-jun, and 游豪俊. "《DISTORTION》－Improving Visual Performance of Animation Creation by Rotoscoping." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/94061224116238409134.

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碩士<br>國立臺南大學<br>動畫媒體設計研究所<br>99<br>The goal of the animation is to make roles come alive in the eyes of the audience and let people feel its reality and existence. In order to achieve the results, we have to depend on various factors to constitute it, such as the appearance of roles, dialogue, action, plot, etc. The technology of Rotoscoping was developed in 1914, and it allowed animators to draw the movements and appearance of roles more similar with actual human beings. Thus animators can capture dynamic images of real people and transfer into animated characters by this technique. Nowadays

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34

"Rate-distortion performance for joint source and channel coding of images." Massachusetts Institute of Technology, Laboratory for Information and Decision Systems], 1996. http://hdl.handle.net/1721.1/3432.

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Michael J. Ruf, James W. Modestino.<br>Caption title.<br>Includes bibliographical references (p. 31-32).<br>Supported by the German Educational Exchange Service (DAAD) as part of the HSP II-program, and in part by ARPA. F30602-92-C-0030 Supported by the Laboratory for Information and Decision Systems, Massachusetts Institute of Technology. DAAH04-95-1-0103

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35

Gannon, Liam. "Effect of Welding Residual Stress and Distortion on Ship Hull Structural Performance." 2011. http://hdl.handle.net/10222/13367.

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The finite element method is used to investigate the effects of welding-induced residual stress and distortion on the strength and behaviour of ship hull structures. A finite element welding simulation consisting of sequentially coupled transient thermal and nonlinear structural analyses is used to predict the three-dimensional residual stress and distortion fields in welded stiffened plates. Three types of stiffener commonly used in commercial and naval applications are considered. The welding simulation is followed by a 'shakedown' analysis to study the possibility of residual stress relief

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36

Awuor, Frederick Mzee. "Distributed joint power and rate adaption in ad hoc networks." 2011. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000287.

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M. Tech. Electrical Engineering.<br>This study proposes a distributive joint power and rate adaptation algorithm (JRPA) in ad hoc networks based on coupled interference minimisation. In the proposed method, the influence of coupled interference was controlled by dynamically adjusting network users' transmit power choices. The users are therefore aware of the current link status while determining their data rates. In addition, every maximize utility of other users as it maximizes its utility due to the inevitable cooperation, hence, improving a collective network performance. Solving this netwo

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37

"An Analysis of the Memory Bottleneck and Cache Performance of Most Apparent Distortion Image Quality Assessment Algorithm on GPU." Master's thesis, 2016. http://hdl.handle.net/2286/R.I.41229.

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abstract: As digital images are transmitted over the network or stored on a disk, image processing is done as part of the standard for efficient storage and bandwidth. This causes some amount of distortion or artifacts in the image which demands the need for quality assessment. Subjective image quality assessment is expensive, time consuming and influenced by the subject's perception. Hence, there is a need for developing mathematical models that are capable of predicting the quality evaluation. With the advent of the information era and an exponential growth in image/video generation and cons

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38

Oliveira, Beatriz Manata de. "Performance analysis of radio over fiber system employing digital predistortion." Master's thesis, 2017. http://hdl.handle.net/10316/83405.

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Dissertação de Mestrado Integrado em Engenharia Electrotécnica e de Computadores apresentada à Faculdade de Ciências e Tecnologia<br>Actualmente, as comunicações sem fios (wireless) estão a entrar numa nova fase, as redes de 5ª geração (5G), onde se espera o aumento de serviços que necessitam de grande largura de banda, nomeadamente, serviços interactivos e multimédia. Para suportar estas exigências, uma vertente da investigação em comunicações wireless estuda a operação na gama das microondas/ondas milimétricas para assim evitar o congestionamento espectral nas baixas frequências. Esta estrat

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Guerreiro, João Francisco Martinho Lêdo. "Analytical Characterization and Optimum Detection of Nonlinear Multicarrier Schemes." Doctoral thesis, 2016. http://hdl.handle.net/10362/19916.

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It is widely recognized that multicarrier systems such as orthogonal frequency division multiplexing (OFDM) are suitable for severely time-dispersive channels. However, it is also recognized that multicarrier signals have high envelope fluctuations which make them especially sensitive to nonlinear distortion effects. In fact, it is almost unavoidable to have nonlinear distortion effects in the transmission chain. For this reason, it is essential to have a theoretical, accurate characterization of nonlinearly distorted signals not only to evaluate the corresponding impact of these distortion

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40

Zhang, Heng. "High Performance RF and Basdband Analog-to-Digital Interface for Multi-standard/Wideband Applications." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8609.

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The prevalence of wireless standards and the introduction of dynamic standards/applications, such as software-defined radio, necessitate the next generation wireless devices that integrate multiple standards in a single chip-set to support a variety of services. To reduce the cost and area of such multi-standard handheld devices, reconfigurability is desirable, and the hardware should be shared/reused as much as possible. This research proposes several novel circuit topologies that can meet various specifications with minimum cost, which are suited for multi-standard applications. This doctora

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