• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 448
  • 88
  • 40
  • 37
  • 21
  • 18
  • 10
  • 10
  • 9
  • 9
  • 9
  • 9
  • 9
  • 9
  • 8
  • Tagged with
  • 760
  • 460
  • 275
  • 258
  • 207
  • 188
  • 186
  • 170
  • 134
  • 131
  • 116
  • 98
  • 90
  • 83
  • 83
  • 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.
191

Design of survivable wavelength division multiplexed passive optical networks.

January 2003 (has links)
by Chan Tsan Jim. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references (leaves 68-71). / Abstracts in English and Chinese. / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Introduction --- p.1 / Chapter 1.2 --- Background --- p.2 / Chapter 1.2.1 --- Introduction --- p.2 / Chapter 1.2.2 --- Wavelength Division Multiplexing --- p.3 / Chapter 1.2.3 --- Arrayed Waveguide Grating --- p.5 / Chapter 1.2.4 --- Passive Optical Networks --- p.7 / Chapter 1.3 --- Outline of the thesis --- p.10 / Chapter Chapter 2 --- Review of Protection and Restoration Schemes --- p.12 / Chapter 2.1 --- Introduction --- p.12 / Chapter 2.2 --- Protection Schemes --- p.14 / Chapter 2.2.1 --- Path Protection --- p.14 / Chapter 2.2.2 --- Link Protection --- p.16 / Chapter 2.3 --- Restoration Schemes --- p.17 / Chapter 2.3.1 --- Path Restoration --- p.17 / Chapter 2.3.2 --- Link Restoration --- p.18 / Chapter 2.4 --- Protection and Restoration Schemes in PON --- p.18 / Chapter 2.4.1 --- Protection Schemes in G.983.1 --- p.18 / Chapter 2.4.2 --- Other Proposed Schemes --- p.21 / Chapter Chapter 3 --- Design of WDM PON Network Architecture --- p.26 / Chapter 3.1 --- Introduction --- p.26 / Chapter 3.2 --- The Group Protection Architecture (GPA) --- p.27 / Chapter 3.2.1 --- Network Design --- p.27 / Chapter 3.2.2 --- Protection Mechanism --- p.28 / Chapter 3.2.3 --- Wavelength Assignments --- p.30 / Chapter 3.2.4 --- Power Budget Calculation --- p.32 / Chapter 3.2.5 --- Crosstalk Analysis --- p.33 / Chapter 3.2.6 --- Discussion --- p.35 / Chapter 3.3 --- The Enhanced Group Protection Architecture (EGPA) --- p.36 / Chapter 3.3.1 --- Introduction --- p.36 / Chapter 3.3.2 --- Network Design --- p.37 / Chapter 3.3.3 --- Protection Mechanism --- p.38 / Chapter 3.3.4 --- Wavelength Assignments --- p.39 / Chapter 3.3.5 --- Power Budget Calculation --- p.40 / Chapter 3.3.6 --- Crosstalk Analysis --- p.41 / Chapter 3.3.7 --- Discussion --- p.42 / Chapter 3.4 --- The Hybrid Ring Architecture (HR) --- p.42 / Chapter 3.4.1 --- Introduction --- p.42 / Chapter 3.4.2 --- Network Design --- p.43 / Chapter 3.4.3 --- Protection Mechanism --- p.44 / Chapter 3.4.4 --- Wavelength Assignments --- p.45 / Chapter 3.4.5 --- Power Budget Calculation --- p.46 / Chapter 3.4.6 --- Crosstalk Analysis --- p.47 / Chapter 3.4.7 --- Discussion --- p.47 / Chapter 3.5 --- Comparison of the three schemes --- p.48 / Chapter 3.6 --- Summary of the three schemes --- p.50 / Chapter Chapter 4 --- Experimental Evaluation --- p.51 / Chapter 4.1 --- Introduction --- p.51 / Chapter 4.2 --- Experimental Setup --- p.51 / Chapter 4.2.1 --- The GPA Scheme --- p.51 / Chapter 4.2.2 --- The EGPA Scheme --- p.53 / Chapter 4.2.3 --- The HR Scheme --- p.54 / Chapter 4.3 --- Experimental Result --- p.55 / Chapter 4.3.1 --- Optical Spectrum --- p.55 / Chapter 4.3.2 --- Transmission Performance --- p.58 / Chapter 4.3.3 --- Switching/Restoration Time --- p.61 / Chapter 4.3.4 --- Crosstalk Penalty --- p.63 / Chapter 4.4 --- Conclusion --- p.64 / Chapter Chapter 5 --- Conclusion and Future Works --- p.65 / Chapter 5.1 --- Introduction --- p.65 / Chapter 5.2 --- Conclusion --- p.65 / Chapter 5.3 --- Future Works --- p.66 / References --- p.67
192

Multicast protection and energy efficient traffic grooming in optical wavelength routing networks.

January 2010 (has links)
Zhang, Shuqiang. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2010. / Includes bibliographical references (p. 74-80). / Abstracts in English and Chinese. / Abstract --- p.i / 摘要 --- p.iv / Acknowledgements --- p.v / Table of Contents --- p.vi / Chapter Chapter 1 --- Background --- p.1 / Chapter 1.1 --- Routing and Wavelength Assignment --- p.1 / Chapter 1.2 --- Survivability in Optical Networks --- p.3 / Chapter 1.3 --- Optical Multicasting --- p.4 / Chapter 1.3.1 --- Routing and Wavelength Assignment of Optical Multicast --- p.5 / Chapter 1.3.2 --- Current Research Topics about Optical Multicast --- p.8 / Chapter 1.4 --- Traffic Grooming --- p.10 / Chapter 1.4.1 --- Static Traffic Grooming --- p.11 / Chapter 1.4.2 --- Dynamic Traffic Grooming --- p.13 / Chapter 1.5 --- Contributions --- p.15 / Chapter 1.5.1 --- Multicast Protection with Scheduled Traffic Model --- p.15 / Chapter 1.5.2 --- Energy Efficient Time-Aware Traffic Grooming --- p.16 / Chapter 1.6 --- Organization of Thesis --- p.18 / Chapter Chapter 2 --- Multicast Protection in WDM Optical Network with Scheduled Traffic --- p.19 / Chapter 2.1 --- Introduction --- p.19 / Chapter 2.2 --- Multicast Protection under FSTM --- p.22 / Chapter 2.3 --- Illustrative Examples --- p.28 / Chapter 2.4 --- Two-Step Optimization under SSTM --- p.37 / Chapter 2.5 --- Summary --- p.40 / Chapter Chapter 3 --- Energy Efficient Time-Aware Traffic Grooming in Wavelength Routing Networks --- p.41 / Chapter 3.1 --- Introduction --- p.41 / Chapter 3.2 --- Energy consumption model --- p.43 / Chapter 3.3 --- Static Traffic Grooming with Time awareness --- p.44 / Chapter 3.3.1 --- Scheduled Traffic Model for Traffic Grooming --- p.44 / Chapter 3.3.2 --- ILP Formulation --- p.44 / Chapter 3.3.3 --- Illustrative Numerical Example --- p.48 / Chapter 3.4 --- Dynamic Traffic Grooming with Time Awareness --- p.49 / Chapter 3.4.1 --- Time-Aware Traffic Grooming (TATG) --- p.51 / Chapter 3.5 --- Simulation Results of Dynamic Traffic Grooming --- p.54 / Chapter 3.5.1 --- 24-node USNET: --- p.55 / Chapter 3.5.2 --- 15-node Pacific Bell Network: --- p.59 / Chapter 3.5.3 --- 14-node NSFNET: --- p.63 / Chapter 3.5.4 --- Alternative Configuration of Simulation Parameters: --- p.67 / Chapter 3.6 --- Summary --- p.71 / Chapter Chapter 4 --- Conclusions and Future Work --- p.72 / Chapter 4.1 --- Conclusions --- p.72 / Chapter 4.2 --- Future Work --- p.73 / Bibliography --- p.74 / Publications during M.Phil Study --- p.80
193

A multicast overlay scheme for wavelength division multiplexed passive optical networks.

January 2009 (has links)
Zhang, Yin. / Thesis submitted in: December 2008. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2009. / Includes bibliographical references (leaves 56-60). / Abstracts in English and Chinese. / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Telecommunications network hierarchy --- p.2 / Chapter 1.2 --- PON architectures for access networks --- p.4 / Chapter 1.2.1 --- TDM-PON --- p.5 / Chapter 1.2.2 --- WDM-PON --- p.7 / Chapter 1.3 --- Data delivery mode in WDM-PON --- p.8 / Chapter 1.3.1 --- Point-to-point --- p.8 / Chapter 1.3.2 --- Broadcast --- p.9 / Chapter 1.3.3 --- Multicast --- p.10 / Chapter 1.4 --- Motivation of this thesis --- p.10 / Chapter 1.5 --- Outline of this thesis --- p.13 / Chapter Chapter 2 --- Previous Multicast Architectures in WDM-PON --- p.14 / Chapter 2.1 --- Introduction --- p.15 / Chapter 2.2 --- Previous WDM-PON architectures with multicast capability --- p.15 / Chapter 2.2.1 --- Subcarrier multiplexing --- p.16 / Chapter 2.2.2 --- All-optical based multicast enabled architecture --- p.18 / Chapter 2.3 --- Summary --- p.21 / Chapter Chapter 3 --- A Multicast enabled WDM-PON Architecture Using ASK-DPSK Orthogonal Modulation --- p.23 / Chapter 3.1 --- Introduction --- p.24 / Chapter 3.2 --- System architecture --- p.25 / Chapter 3.3 --- Experimental Demonstration --- p.27 / Chapter 3.4 --- Discussion --- p.31 / Chapter 3.5 --- Summary --- p.36 / Chapter Chapter 4 --- A WG filtering and its suppression in quaternary ASK-DPSK based multicast enabled WDM-PON --- p.37 / Chapter 4.1 --- Introduction --- p.38 / Chapter 4.2 --- Principle of narrowband filtering --- p.38 / Chapter 4.3 --- Simulation model --- p.40 / Chapter 4.4 --- Simulation results and discussion --- p.42 / Chapter 4.4.1 --- Different extinction ratios --- p.43 / Chapter 4.4.2 --- Different AWG filter shape and bandwidth --- p.47 / Chapter 4.5 --- Summary --- p.50 / Chapter Chapter 5 --- Summary and Future Works --- p.51 / Chapter 5.1 --- Summary of the thesis --- p.52 / Chapter 5.2 --- Future works --- p.53 / List of Publications --- p.55 / BIBLIOGRAPHY --- p.56
194

Robust beamforming for collaborative MIMO-OFDM wireless systems

Kwun, Byong-Ok. January 2007 (has links)
No description available.
195

Novel resource allocation schemes in optical burst switching networks

Li, Guangming, January 2006 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format.
196

Design and analysis of survivable WDM mesh networks

Li, Ji, January 2007 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2007. / Title from title frame. Also available in printed format.
197

Multichannel, multiuser and multiple antenna wireless communication systems

Bala, Erdem. January 2007 (has links)
Thesis (Ph.D.)--University of Delaware, 2007. / Principal faculty advisor: Leonard J. Cimini, Jr., Electrical and Computer Engineering. Includes bibliographical references.
198

Resource optimization and QoS for WDM optical networks

Wang, Kefei. January 1900 (has links)
Thesis (Ph.D.)--University of Nebraska-Lincoln, 2006. / Title from title screen (viewed Mar. 30, 2007). PDF text: vii, 83 p. : ill. (some col.) ; 0.44 Mb. UMI publication number: AAT 3225887. Includes bibliographical references. Also available in microfilm and microfiche formats.
199

Semi-blind signal detection for MIMO and MIMO-OFDM systems

Ma, Shaodan. January 2006 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format.
200

Methods to Prepare DNA for Efficient Massive Sequencing

Lundin, Sverker January 2012 (has links)
Massive sequencing has transformed the field of genome biology due to the continuous introduction and evolution of new methods. In recent years, the technologies available to read through genomes have undergone an unprecedented rate of development in terms of cost-reduction. Generating sequence data has essentially ceased to be a bottleneck for analyzing genomes instead to be replaced by limitations in sample preparation and data analysis. In this work, new strategies are presented to increase both the throughput of library generation prior to sequencing, and the informational content of libraries to aid post-sequencing data processing. The protocols developed aim to enable new possibilities for genome research concerning project scale and sequence complexity. The first two papers that underpin this thesis deal with scaling library production by means of automation. Automated library preparation is first described for the 454 sequencing system based on a generic solid-phase polyethylene-glycol precipitation protocol for automated DNA handling. This was one of the first descriptions of automated sample handling for producing next generation sequencing libraries, and substantially improved sample throughput. Building on these results, the use of a double precipitation strategy to replace the manual agarose gel excision step for Illumina sequencing is presented. This protocol considerably improved the scalability of library construction for Illumina sequencing. The third and fourth papers present advanced strategies for library tagging in order to multiplex the information available in each library. First, a dual tagging strategy for massive sequencing is described in which two sets of tags are added to a library to trace back the origins of up to 4992 amplicons using 122 tags. The tagging strategy takes advantage of the previously automated pipeline and was used for the simultaneous sequencing of 3700 amplicons. Following that, an enzymatic protocol was developed to degrade long range PCR-amplicons and forming triple-tagged libraries containing information of sample origin, clonal origin and local positioning for the short-read sequences. Through tagging, this protocol makes it possible to analyze a longer continuous sequence region than would be possible based on the read length of the sequencing system alone. The fifth study investigates commonly used enzymes for constructing libraries for massive sequencing. We analyze restriction enzymes capable of digesting unknown sequences located some distance from their recognition sequence. Some of these enzymes have previously been extensively used for massive nucleic acid analysis. In this first high throughput study of such enzymes, we investigated their restriction specificity in terms of the distance from the recognition site and their sequence dependence. The phenomenon of slippage is characterized and shown to vary significantly between enzymes. The results obtained should favor future protocol development and enzymatic understanding. Through these papers, this work aspire to aid the development of methods for massive sequencing in terms of scale, quality and knowledge; thereby contributing to the general applicability of the new paradigm of sequencing instruments. / <p>QC 20121126</p>

Page generated in 0.053 seconds