Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2006. / Leach, William M., Committee Member ; Sills, James A., Committee Member ; Kenney, J. Stevenson, Committee Chair ; Zhou, G. Tong, Committee Co-Chair ; Fenney, Robert K., Committee Member.

M.Sc. (Information Technology) / A new particle swarm optimisation (PSO) algorithm that produces solutions to the xed spectrum frequency assignment problem (FS-FAP) is presented. Solutions to the FS-FAP are used to allocate frequencies in a mobile telecommunications network and must have low interference. The standard PSO algorithm's velocity method and global selection is ill suited for the frequency assignment problem (FAP). Therefore using the standard PSO algorithm as base, new techniques are developed to allow it to operate on the FAP. The new techniques include two velocity methods and three global selection schemes. This study presents the results of the algorithm operating on the Siemens set of COST 259 problems and shows that it is viable applying the PSO to the FAP.

To date, hundreds of millions of mini-QWERTY keyboard equipped devices (miniaturized versions of a full desktop keyboard) have been sold. Accordingly, a large percentage of text messages originate from fixed-key, mini-QWERTY keyboard enabled mobile phones. Over a series of three longitudinal studies I quantify how quickly and accurately individuals can input text on mini-QWERTY keyboards. I evaluate performance in ideal laboratory conditions as well as in a variety of mobile contexts. My first study establishes baseline performance measures; my second study investigates the impact of limited visibility on text input performance; and my third study investigates the impact of mobility (sitting, standing, and walking) on text input performance. After approximately five hours of practice, participants achieved expertise typing almost 60 words per minute at almost 95% accuracy. Upon completion of these studies, I examine the types of errors that people make when typing on mini-QWERTY keyboards. Having discovered a common pattern in errors, I develop and refine an algorithm to automatically detect and correct errors in mini-QWERTY keyboard enabled text input. I both validate the algorithm through the analysis of pre-recorded typing data and then empirically evaluate the impacts of automatic error correction on live mini-QWERTY keyboard text input. Validating the algorithm over various datasets, I demonstrate the potential to correct approximately 25% of the total errors and correct up to 3% of the total keystrokes. Evaluating automatic error detection and correction on live typing results in successfully correcting 61% of the targeted errors committed by participants while increasing typing rates by almost two words per minute without introducing noticeable distraction.

The purpose of this study was to investigate whether learners from different primary schools would respond to cell phone SMS (short message service) questions related to their schoolwork after school hours. As young people use cell phone technology to socialise, it seemed appropriate to consider integrating this technology within the school-framework, as many schools do not allow the use of cell phones during school. Another aim was to find out whether socio-economic backgrounds or gender groups responded differently to the SMS interaction study. A concurrent triangulation design research method was applied. The study examined how often and what types of answers learners would submit via SMS after school hours. The principal conclusion was that the learners reacted positively to the SMS feedback response sent in reply to an SMS answer and then engaged to a greater degree with the further questions.

Despite efforts to mitigate texting and driving in the United States, accidents as a result of distracted driving continue to increase, especially within the 16-24 age group. Considering the traits of the members of this age group, as well as the attributes of the various means that are utilized to mitigate such behavior, I hypothesize that the employment of filmed narratives in public service announcements is more effective than any other established approach. Testing the validity of this hypothesis, contributing to a lack of research, three methods of analysis were employed in this project: a textual analysis of a filmed narrative; an audience analysis of the comments accompanying the filmed narrative; and a video session followed by a self-administered questionnaire. The results of this study indicate that while the filmed narrative is more effective than the spoken narrative, more intensive analyses are necessary for further speculation. / Includes bibliography. / Thesis (M.A.)--Florida Atlantic University, 2017. / FAU Electronic Theses and Dissertations Collection

by Yue Ping Zhang. / Publication date from spine. / Thesis (Ph.D.)--Chinese University of Hong Kong, 1995. / Includes bibliographical references (leaves 194-200). / DEDICATION / ACKNOWLEDGMENTS / Chapter / Chapter 1. --- Introduction --- p.1 / Chapter 1.1 --- Brief Description of Tunnels --- p.1 / Chapter 1.2 --- Review of Tunnel Imperfect Waveguide Models --- p.2 / Chapter 1.3 --- Review of Tunnel Geometrical Optical Model --- p.4 / Chapter 1.4 --- Review of Tunnel Propagation Experimental Results --- p.6 / Chapter 1.5 --- Review of Existing Tunnel UHF Radio Communication Systems --- p.13 / Chapter 1.6 --- Statement of Problems to be Studied --- p.15 / Chapter 1.7 --- Organization --- p.15 / Chapter 2 --- Propagation in Empty Tunnels --- p.18 / Chapter 2.1 --- Introduction --- p.18 / Chapter 2.2 --- Propagation in Empty Tunnels --- p.18 / Chapter 2.2.1 --- The Imperfect Empty Straight Rectangular Waveguide Model --- p.19 / Chapter 2.2.2 --- The Hertz Vectors for Empty Straight Tunnels --- p.20 / Chapter 2.2.3 --- The Propagation Modal Equations for Empty Straight Tunnels --- p.23 / Chapter 2.2.4 --- The Propagation Characteristics of Empty Straight Tunnels --- p.26 / Chapter 2.2.5 --- Propagation Numerical Results in Empty Straight Tunnels --- p.30 / Chapter 2.3 --- Propagation in Empty Curved Tunnels --- p.36 / Chapter 2.3.1 --- The Imperfect Empty Curved Rectangular Waveguide Model --- p.37 / Chapter 2.3.2 --- The Hertz Vectors for Empty Curved Tunnels --- p.39 / Chapter 2.3.3 --- The Propagation Modal Equations for Empty Curved Tunnels --- p.41 / Chapter 2.3.4 --- The Propagation Characteristics of Empty Curved Tunnels --- p.43 / Chapter 2.2.5 --- Propagation Numerical Results in Empty Curved Tunnels --- p.47 / Chapter 2.4 --- Summary --- p.50 / Chapter 3 --- Propagation in Occupied Tunnels --- p.53 / Chapter 3.1 --- Introduction --- p.53 / Chapter 3.2 --- Propagation in Road Tunnels --- p.53 / Chapter 3.2.1 --- The Imperfect Partially Filled Rectangular Waveguide Model --- p.54 / Chapter 3.2.2 --- The Scalar Potentials for Road tunnels --- p.56 / Chapter 3.2.3 --- The Propagation Modal Equations for Road Tunnels --- p.59 / Chapter 3.2.4 --- Propagation Numerical Results in Road Tunnels --- p.61 / Chapter 3.3 --- Propagation in Railway Tunnels --- p.64 / Chapter 3.3.1 --- The Imperfect Periodically Loaded Rectangular Waveguide Model --- p.65 / Chapter 3.3.2 --- The Surface Impedance Approximation --- p.66 / Chapter 3.3.2.1 --- The Surface Impedance of a Semi-infinite Lossy Dielectric Medium --- p.66 / Chapter 3.3.2.2 --- The Surface Impedance of a Thin Lossy Dielectric Slab --- p.67 / Chapter 3.3.2.3 --- The Surface Impedance of a Three-layered Half Space --- p.69 / Chapter 3.3.2.4 --- The Surface Impedance of the Sidewall of a Train in a Tunnel --- p.70 / Chapter 3.3.3 --- The Hertz Vectors for Railway Tunnels --- p.71 / Chapter 3.3.4 --- The Propagation Modal Equations for Railway Tunnels --- p.73 / Chapter 3.3.5 --- The Propagation Characteristics of Railway Tunnels --- p.76 / Chapter 3.3.6 --- Propagation Numerical Results in Railway Tunnels --- p.78 / Chapter 3.4 --- Propagation in Mine Tunnels --- p.84 / Chapter 3.4.1 --- The Imperfect periodically Loaded Rectangular Waveguide Model --- p.85 / Chapter 3.4.2 --- The Hertz Vectors for Mine Tunnels --- p.86 / Chapter 3.4.3 --- The Propagation modal Equations for Mine Tunnels --- p.88 / Chapter 3.4.4 --- The Propagation Characteristics of Mine Tunnels --- p.95 / Chapter 3.4.5 --- Propagation Numerical Results in Mine Tunnels --- p.96 / Chapter 3.5 --- Summary --- p.97 / Chapter 4 --- Statistical and Deterministic Models of Tunnel UHF Propagation --- p.100 / Chapter 4.1 --- Introduction --- p.100 / Chapter 4.2 --- Statistical Model of Tunnel UHF Propagation --- p.100 / Chapter 4.2.1 --- Experiments --- p.101 / Chapter 4.2.1.1 --- Experimental Set-ups --- p.102 / Chapter 4.2.1.2 --- Experimental Tunnels --- p.104 / Chapter 4.2.1.3 --- Experimental Techniques --- p.106 / Chapter 4.2.2 --- Statistical Parameters --- p.109 / Chapter 4.2.2.1 --- Parameters to Characterize Narrow Band Radio Propagation Channels --- p.109 / Chapter 4.2.2.2 --- Parameters to Characterize Wide Band Radio Propagation Channels --- p.111 / Chapter 4.2.3 --- Propagation Statistical Results and Discussion --- p.112 / Chapter 4.2.3.1 --- Tunnel Narrow Band Radio Propagation Characteristics --- p.112 / Chapter 4.2.3.1.1 --- Power Distance Law --- p.114 / Chapter 4.2.3.1.2 --- The Slow Fading Statistics --- p.120 / Chapter 4.2.3.1.3 --- The Fast Fading Statistics --- p.122 / Chapter 4.2.3.2 --- Tunnel Wide Band Radio Propagation Characteristics --- p.125 / Chapter 4.2.3.2.1 --- RMS Delay Spread --- p.126 / Chapter 4.2.3.2.2 --- RMS Delay Spread Statistics --- p.130 / Chapter 4.3 --- Deterministic Model of Tunnel UHF Propagation --- p.132 / Chapter 4.3.1 --- The Tunnel Geometrical Optical Propagation Model --- p.134 / Chapter 4.3.2 --- The Tunnel Impedance Uniform Diffracted Propagation Model --- p.141 / Chapter 4.3.2.1 --- Determination of Diffraction Points --- p.146 / Chapter 4.3.2.2 --- Diffraction Coefficients for Impedance Wedges --- p.147 / Chapter 4.3.3 --- Comparison with Measurements --- p.151 / Chapter 4.3.3.1 --- Narrow Band Comparison of Simulated and Measured Results --- p.151 / Chapter 4.3.3.1.1 --- Narrow Band Propagation in Empty Straight Tunnels --- p.151 / Chapter 4.3.3.1.2 --- Narrow Band Propagation in Curved or Obstructed Tunnels --- p.154 / Chapter 4.3.3.2 --- Wide Band Comparison of Simulated and Measured Results --- p.158 / Chapter 4.3.3.2.1 --- Wide Band Propagation in Empty Straight Tunnels --- p.159 / Chapter 4.3.3.2.2 --- Wide Band Propagation in an Obstructed Tunnel --- p.163 / Chapter 4.4 --- Summary --- p.165 / Chapter 5 --- Propagation in Tunnel and Open Air Transition Region --- p.170 / Chapter 5.1 --- Introduction --- p.170 / Chapter 5.2 --- Radiation of Radio Waves from a Rectangular Tunnel into Open Air --- p.171 / Chapter 5.2.1 --- Radiation Formulation Using Equivalent Current Source Concept --- p.171 / Chapter 5.2.2 --- Radiation Numerical Results --- p.175 / Chapter 5.3 --- Propagation Characteristics of UHF Radio Waves in Cuttings --- p.177 / Chapter 5.3.1 --- The Attenuation Constant due to the Absorption --- p.178 / Chapter 5.3.2 --- The Attenuation Constant due to the Roughness of the Sidewalls --- p.182 / Chapter 5.3.3 --- The Attenuation Constant due to the tilts of the Sidewalls --- p.183 / Chapter 5.3.4 --- Propagation Numerical Results in Cuttings --- p.184 / Chapter 5.4 --- Summary --- p.187 / Chapter 6 --- Conclusion and Recommendation for Future Work --- p.189 / APPENDIX --- p.193 / The Approximate Solution of a Transcendental Equation --- p.193 / REFERENCES --- p.194

Shen Fangzhong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2002. / Includes bibliographical references (leaves 55-57). / Abstracts in English and Chinese. / Abstract --- p.i / Acknowledgements --- p.iii / List of Figures --- p.vi / List of Tables --- p.ix / Chapter Chapter 1. --- Introduction --- p.1 / Chapter 1.1. --- Motivation --- p.1 / Chapter 1.2. --- Related Work --- p.2 / Chapter 1.3. --- Our Work --- p.2 / Chapter 1.4. --- Some Assumptions --- p.2 / Chapter 1.4.1. --- Beamforming --- p.2 / Chapter 1.4.2. --- Downlink Channel --- p.2 / Chapter 1.4.3. --- Single Cell --- p.3 / Chapter 1.5. --- Thesis Road Map --- p.3 / Chapter Chapter 2. --- Preliminaries of Cell Sectoring --- p.4 / Chapter 2.1. --- Introduction --- p.4 / Chapter 2.2. --- Beamforming --- p.4 / Chapter 2.2.1. --- Linear Array --- p.5 / Chapter 2.2.2. --- Circular Array --- p.8 / Chapter 2.2.3. --- Butler Beamforming Network --- p.9 / Chapter 2.2.4. --- Dynamic Beamforming --- p.10 / Chapter 2.3. --- Power Control --- p.16 / Chapter Chapter 3. --- Dynamic Cell Sectoring --- p.19 / Chapter 3.1. --- Introduction --- p.19 / Chapter 3.2. --- Minimum Total Transmission Power sectoring --- p.21 / Chapter 3.2.1. --- Problem Statement --- p.21 / Chapter 3.2.2. --- Shortest Path Problem Formulation --- p.23 / Chapter 3.2.3. --- Shortest Path Algorithm and Complexity --- p.26 / Chapter 3.2.4. --- Graph Reduction --- p.28 / Chapter 3.2.5. --- Example --- p.30 / Chapter 3.3. --- Power Equalization Sectoring --- p.33 / Chapter 3.3.1. --- Relationship Between MinTTP Sectoring and PE Sectoring --- p.33 / Chapter 3.3.2. --- Power Equalization Sectoring Algorithm --- p.36 / Chapter 3.4. --- Numerical Results --- p.37 / Appendix --- p.44 / Chapter Chapter 4. --- Resectoring Algorithms --- p.46 / Chapter 4.1. --- Introduction --- p.46 / Chapter 4.2. --- Nyquist Sampling Theorem --- p.47 / Chapter 4.3. --- MinTTP Resectoring --- p.47 / Chapter 4.4. --- PE Resectoring --- p.43 / Chapter 4.5. --- Handoff --- p.48 / Chapter 4.5.1. --- Handoff Load --- p.49 / Chapter 4.6. --- Performance --- p.49 / Chapter Chapter 5. --- Conclusion and Future Work --- p.53 / Chapter 5.1. --- Thesis Summary --- p.53 / Chapter 5.2. --- Future Work --- p.54 / Bibliography --- p.55

Wong Chung-Yu. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2002. / Includes bibliographical references (leaf 75). / Abstracts in English and Chinese. / Abstract --- p.ii / List of figures --- p.viii / List of tables --- p.ix / Chapter 1. --- BACKGROUND --- p.1 / Chapter 1.1 --- An analysis of manuals --- p.1 / Chapter 1.2 --- Existing practice --- p.5 / Chapter 1.3 --- New concept in dynamic manual --- p.7 / Chapter 1.3.1 --- Dynamic representation --- p.7 / Chapter 1.3.2 --- Machine-orientation --- p.8 / Chapter 2. --- DESIGN PHILOSOPHY --- p.10 / Chapter 2.1 --- Concept --- p.10 / Chapter 2.2 --- Data node --- p.12 / Chapter 2.3 --- Characteristic of function and operator --- p.14 / Chapter 2.4 --- Function hierarchy --- p.17 / Chapter 2.5 --- Manual-tree (conceptual and actual) --- p.18 / Chapter 2.6 --- Coding --- p.20 / Chapter 2.7 --- Operation sequence --- p.21 / Chapter 2.8 --- Parameter passing --- p.22 / Chapter 2.9 --- Manual-tree operation --- p.24 / Chapter 3. --- IMPLEMETATION OF DYNAMIC MANUAL SYSTEM --- p.25 / Chapter 3.1 --- Generator --- p.26 / Chapter 3.1.1 --- File format and generation --- p.26 / Chapter 3.2 --- Reader --- p.35 / Chapter 3.2.1 --- Guide service --- p.36 / Chapter 3.2.2 --- Button querying service --- p.37 / Chapter 3.2.3 --- Personal management service --- p.38 / Chapter 3.2.3.1 --- Insert --- p.38 / Chapter 3.2.3.2 --- Delete --- p.40 / Chapter 3.2.3.3 --- Swap --- p.40 / Chapter 3.3 --- The graphics --- p.42 / Chapter 4. --- EXPERIMENTS --- p.43 / Chapter 4.1 --- Experiment I (mobile phone) --- p.43 / Chapter 4.1.1 --- Data preparation --- p.43 / Chapter 4.1.2 --- Generating XML file --- p.46 / Chapter 4.1.3 --- Preparing multimedia material --- p.46 / Chapter 4.1.4 --- Design of Reader --- p.47 / Chapter 4.1.5 --- Testing --- p.51 / Chapter 4.1.5.1 --- Top-down search test --- p.51 / Chapter 4.1.5.2 --- Bottom-up search test --- p.52 / Chapter 4.1.5.3 --- function hierarchy modifying test --- p.53 / Chapter 4.2 --- Experiment II (pager) --- p.54 / Chapter 4.2.1 --- Data preparation --- p.54 / Chapter 4.2.2 --- Generating XML file --- p.54 / Chapter 4.2.3 --- Preparing multimedia material and the Reader --- p.56 / Chapter 4.2.4 --- Testing --- p.57 / Chapter 4.2.4.1 --- Top-down search test --- p.58 / Chapter 4.2.4.2 --- Bottom-up search test --- p.58 / Chapter 4.2.4.3 --- function hierarchy modifying test --- p.59 / Chapter 4.3 --- Control graphics constrain --- p.61 / Chapter 5. --- RESULTS --- p.65 / Chapter 5.1 --- Change of representation --- p.65 / Chapter 5.2 --- Storage and computation requirements --- p.70 / Chapter 6. --- CONCLUSION --- p.72 / References --- p.75 / Appendix A.1 input file of mobile phone (function part) --- p.76 / Appendix A.2 input file of mobile phone (operator part) --- p.96 / Appendix B.1 input file of pager (function part) --- p.105 / Appendix B.2 input file of pager (operator part) --- p.111 / Appendix C Function hierarchies and operator lists of the experiments --- p.113 / Appendix D Key words --- p.117

Yang Yang. / "July 2002." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2002. / Includes bibliographical references (2nd gr., p. 1-9). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

by Wing Ho Andy Yuen. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1997. / Includes bibliographical references (leaves 85-[90]). / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Design Issues in Wireless Cellular Systems --- p.1 / Chapter 1.1.1 --- Channel Assignment --- p.2 / Chapter 1.1.2 --- Handoff --- p.3 / Chapter 1.1.3 --- Multiple Accesses --- p.3 / Chapter 1.1.4 --- Mobility Management --- p.4 / Chapter 1.2 --- Motivation of the thesis --- p.5 / Chapter 1.3 --- Outline of the thesis --- p.6 / Chapter 2 --- Background Studies --- p.9 / Chapter 2.1 --- Current Standards --- p.9 / Chapter 2.2 --- Mobility Models --- p.11 / Chapter 2.2.1 --- Fluid Flow Model --- p.12 / Chapter 2.2.2 --- Markovian model --- p.13 / Chapter 2.3 --- Dynamic versus Static Location Strategy --- p.14 / Chapter 2.4 --- Location Registration Strategies --- p.14 / Chapter 2.4.1 --- Time Based Strategy --- p.15 / Chapter 2.4.2 --- Geographic Based Strategy --- p.17 / Chapter 2.4.3 --- Distance Based Strategy --- p.18 / Chapter 2.4.4 --- Miscellaneous Strategies --- p.19 / Chapter 2.5 --- Summary --- p.20 / Chapter 3 --- Hybrid Bloom Filter Location Update Algorithm --- p.21 / Chapter 3.1 --- Introduction --- p.21 / Chapter 3.2 --- System Model --- p.22 / Chapter 3.3 --- Hybrid Bloom Filter Algorithm --- p.23 / Chapter 3.3.1 --- Location Update Protocol --- p.23 / Chapter 3.3.2 --- Paging Protocol --- p.25 / Chapter 3.4 --- Performance Evaluation --- p.27 / Chapter 3.4.1 --- Comparison of the hybrid and time based Bloom filter algorithms --- p.32 / Chapter 3.5 --- Numerical Studies --- p.33 / Chapter 3.5.1 --- Cost versus mobility --- p.34 / Chapter 3.5.2 --- Cost versus call arrival rate --- p.37 / Chapter 3.6 --- Summary --- p.39 / Chapter 4 --- A Dynamic Location Area Assignment Algorithm --- p.40 / Chapter 4.1 --- Geographic versus Distance Based Strategies --- p.41 / Chapter 4.2 --- System Model --- p.42 / Chapter 4.2.1 --- cell layout --- p.42 / Chapter 4.2.2 --- mobility model --- p.43 / Chapter 4.2.3 --- cost function --- p.44 / Chapter 4.3 --- Dynamic Location Area Assignment Algorithm --- p.45 / Chapter 4.3.1 --- Measurement --- p.46 / Chapter 4.3.2 --- "Computation of (iopt, jopt)" --- p.46 / Chapter 4.3.3 --- Computation of location area size k --- p.51 / Chapter 4.4 --- Numerical Studies --- p.52 / Chapter 4.5 --- Summary --- p.57 / Chapter 5 --- Paging Cost Reduction Using Bloom Filtering As Auxilliary Strategy --- p.64 / Chapter 5.1 --- Introduction --- p.64 / Chapter 5.2 --- A Case Study - Joint DLA-HBF Algorithm --- p.65 / Chapter 5.2.1 --- The Algorithm --- p.65 / Chapter 5.2.2 --- Performance Evaluation --- p.67 / Chapter 5.3 --- Summary --- p.68 / Chapter 6 --- Conclusion --- p.70 / Chapter 6.1 --- Summary of Results --- p.70 / Chapter 6.2 --- Future Research Directions --- p.71 / Appendix --- p.73 / Chapter A --- Optimality of the Hybrid Bloom Filter Algorithm --- p.73 / Chapter B --- Derivation of the Expected First Passage Time ExTi and EyTj --- p.77 / Chapter C --- Optimality of the Dynamic Location Area Algorithm --- p.81 / Bibliography --- p.85