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 248 for “"lossy"”.
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Nonadaptive lossy encoding of sparse signals
At high rate, a sparse signal is optimally encoded through an adaptive strategy that finds and encodes the signal's representation in the sparsity-inducing basis. This thesis examines how much the distortion rate (D(R)) performance of a nonadaptive encoder, one that is not allowed to explicitly …
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Iterative algorithms for lossy source coding
This thesis explores the problems of lossy source coding and information embedding. For lossy source coding, we analyze low density parity check (LDPC) codes and low density generator matrix (LDGM) codes for quantization under a Hamming distortion. We prove that LDPC codes can achieve the …
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Wave propagation in lossy waveguide structures
In this thesis a numerical technique is developed determining the propagation constant in waveguides and transmission lines. The technique accounts for both dielectric and conductor losses in a guide having an arbitrary cross section and uses a full-wave solution process. A set of coupled, vector …
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Image Quality Evaluation in Lossy Compressed Images
… on the quantification of image quality in lossy compressed images, exploring the impact of digital artefacts and scene characteristics upon image quality evaluation. A subjective paired comparison test was implemented to assess perceived quality of JPEG 2000 against baseline JPEG over a …
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Lossy compression of speech using perceptual criteria
The research contained in this thesis provides an investigation into a new method of minimising the perceptual differences when encoding digitised speech. An application of the perceptual criteria is described in the context of a codebook encoding methodology Some of the background studies covered …
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Analysis and Synthesis of Lossy Communication Nets
Made available in DSpace on 2014-12-08T22:23:49Z (GMT). No. of bitstreams: 1 6511847.pdf: 1676438 bytes, checksum: 6686110c8e840463d59aab5d9ac4237e (MD5) Previous issue date: 1965
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Enabling Approximate Storage through Lossy Media Data Compression
… and presents our own contribution that uses lossy compression to reduce the storage cost of media data.
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Two algorithms for Lossy compression of 3D images
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Propagation and interference in lossy microelectronic integrated circuits
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.
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Efficient delivery of scalable media streaming over lossy networks
… of existing scalable video models over a lossy network and determine how the variation in viewable quality is affected by packet loss. This work focuses on leveraging the benefits of scalable media, while reducing the effects of data loss on achievable video quality. The overall approach …
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Dielectric resonator in the presence of a lossy conductor
… a post dielectric resonator in the presence of a lossy conductor. A full field analysis is performed on an infinite dielectric rod from which the complex propagation constant and modal solutions are found. Using a single dominant mode (HEM<sub>ll</sub>), the boundary conditions at the end of the …
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Temporal Lossy In-Situ Compression for Computational Fluid Dynamics Simulations
Während CFD Simulationen für Metallschmelze im Rahmen des SFB920 fallen auf dem Taurus HPC Cluster in Dresden sehr große Datenmengen an, deren Handhabung den wissenschaftlichen Arbeitsablauf stark verlangsamen. Zum einen ist der Transfer in Visualisierungssysteme nur unter hohem Zeitaufwand …
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Transient analysis of lossy multiconductor transmission lines in nonlinear circuits
… two time-domain models are developed for lossy multiconductor transmissions lines. It is shown that the endpoints of a lossy multiconductor line can be represented at each time step by discretized Thevenin or Norton equivalent circuits. Because these models contain only lumped elements, …
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Variable-rate lossy compression and its effects on communication networks
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Design and measurement of antennas within lossy materials for IoT applications
… communicating devices, often encapsulated with lossy filler materials which cause issues for the embedded antennas. This thesis studies methods of enhancing antenna radiation efficiency in such situations along with an improved, low-cost way of measuring radiation efficiency. Multiple modified …
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Dielectric characterization of materials and lossy filter design using reflected group delay
… on the required filter response. The concept of lossy filter is based on the fact that loss in a filter is distributed among the various resonators in a way that helps to achieve flat in-band response. This is achieved at the cost of degraded insertion loss. In this way, lossy filters provide an …
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Analysis of Arbitrarily Shaped Wire Antennas Radiating Over a Lossy Half-Space
Made available in DSpace on 2014-12-12T20:55:01Z (GMT). No. of bitstreams: 1 8004249.pdf: 3789104 bytes, checksum: a8c10912bf3a3648386c30bd8c950756 (MD5) Previous issue date: 1979
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