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Current monitoring can facilitate preemptive action in electrical distribution network, so as to relieve power congestion, improve transmission efficiency, and ensure network reliability. The non-invasive current sensing devices are promising since they do not require contacting hazardous high voltage and their installation is much easier compared with invasive current sensing devices. However, the existing non-invasive current sensing devices, such as current clamps and Rogowski coils are only applicable for measuring single-core underground power cables. In this paper, we established a non-invasive technique, that can monitor the currents of a multi-core underground power cable by measuring the emitted magnetic field around the cable surface. The additional magnetic fields generated by induced and leakage currents on the cables were firstly evaluated. Magnetoresistive (MR) sensors in a circular array were adopted to measure magnetic field around the cable surface, and a triple-layer shielding was designed to reduce the effects of external interference. Regarding intrinsic noise in MR sensors (e.g., 1/f noise and thermal noise), magnetic flux concentrators were supplemented to improve the signal-to-noise ratio. The developed platform was tested in a substation, and the reconstructed results closely matched the real geometrical configuration and current records of the tested cable. Apart from the non-invasive feature, the platform also shows great potential to improve the sensing capability of current amplitude and frequency compared with CTs by adopting MR sensors.

by Lee Wing Kin., Thesis (M.Phil.)--Chinese University of Hong Kong, 2000., Includes bibliographical references (leaves 81-90)., s in English and Chinese., p.i, Acknowledgments --- p.iii, List of Figures --- p.vii, List of Tables --- p.viii, Chapter 1 --- Introduction --- p.1, Chapter 1.1 --- Clustering --- p.1, Chapter 1.1.1 --- Hierarchical Classification --- p.2, Chapter 1.1.2 --- Partitional Classification --- p.3, Chapter 1.1.3 --- Comparative Analysis --- p.4, Chapter 1.2 --- Cluster Analysis and Traveling Salesman Problem --- p.5, Chapter 1.3 --- Solving Clustering Problem --- p.7, Chapter 1.4 --- Genetic Algorithms --- p.9, Chapter 1.5 --- Outline of Work --- p.11, Chapter 2 --- The Clustering Algorithms and Applications --- p.13, Chapter 2.1 --- Introduction --- p.13, Chapter 2.2 --- Traveling Salesman Problem --- p.14, Chapter 2.2.1 --- Related Work on TSP --- p.14, Chapter 2.2.2 --- Solving TSP using Genetic Algorithm --- p.15, Chapter 2.3 --- Applications --- p.22, Chapter 2.3.1 --- Clustering for Vertical Partitioning Design --- p.22, Chapter 2.3.2 --- Horizontal Partitioning a Relational Database --- p.36, Chapter 2.3.3 --- Object-Oriented Database Design --- p.42, Chapter 2.3.4 --- Document Database Design --- p.49, Chapter 2.4 --- Conclusions --- p.53, Chapter 3 --- The Experiments for Vertical Partitioning Problem --- p.55, Chapter 3.1 --- Introduction --- p.55, Chapter 3.2 --- Comparative Study --- p.56, Chapter 3.3 --- Experimental Results --- p.59, Chapter 3.4 --- Conclusions --- p.61, Chapter 4 --- Three New Operators for TSP --- p.62, Chapter 4.1 --- Introduction --- p.62, Chapter 4.2 --- Enhanced Cost Edge Recombination Operator --- p.63, Chapter 4.3 --- Shortest Path Operator --- p.66, Chapter 4.4 --- Shortest Edge Operator --- p.69, Chapter 4.5 --- The Experiments --- p.71, Chapter 4.5.1 --- Experimental Results for a 48-city TSP --- p.71, Chapter 4.5.2 --- Experimental Results for Problems in TSPLIB --- p.73, Chapter 4.6 --- Conclusions --- p.77, Chapter 5 --- Conclusions --- p.78, Chapter 5.1 --- Summary of Achievements --- p.78, Chapter 5.2 --- Future Development --- p.80, Bibliography --- p.81, http://library.cuhk.edu.hk/record=b5890401, Use of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/)

by Yeung Oi Yung, Betty, Lee Wing Kin., Thesis (M.B.A.)--Chinese University of Hong Kong, 1990., Bibliography: leaves 218-222., p.ii, TABLE OF CONTENTS --- p.v, LIST OF APPENDICES --- p.viii, ACKNOWLEDGEMENTS --- p.ix, Chapter PART A --- "INTRODUCTION, OBJECTIVES AND METHODOLOGY", Chapter I. --- INTRODUCTION, The evolution process --- p.1, The Third Wave --- p.2, The local market place --- p.4, The quest for knowledgeable practitioners --- p.5, Chapter II. --- OBJECTIVES AND METHODOLOGY, Decision making objectives --- p.7, Research objectives --- p.9, Organization of research content --- p.10, Methodology --- p.12, Chapter PART B --- RESULTS, Chapter III. --- ENVIRONMENTAL FACTORS FOR DIRECT MARKETING, The world environment in the view of famous marketers --- p.23, Demographic changes in Hong Kong relating to demassification --- p.25, Communication and transportation --- p.38, Interpretation --- p.43, Chapter IV. --- CHARACTERISTICS OF DIRECT MARKETING AND FEATURES OF FINANCIAL SERVICES, Introduction --- p.45, Accountability --- p.47, One-to-one marketing --- p.49, Scientific orientation --- p.52, Myths of direct marketing --- p.58, Comparison with general advertising --- p.61, Financial services industry --- p.65, Direct marketing activities in Hong Kong --- p.69, Chapter V. --- DIRECT MARKETING AS A TOTAL MARKETING CONCEPT, Introduction --- p.74, Marketing mix and direct marketing --- p.75, Marketing objective of the graduate card program --- p.76, Product --- p.77, Price --- p.78, Place --- p.79, Promotion --- p.80, Evaluation of results --- p.82, Interpretation --- p.83, Chapter VI. --- APPLICATION OF DIRECT MARKETING IN THE FINANCIAL SERVICES INDUSTRY, Introduction --- p.85, Discussion and analysis --- p.89, Interview reports --- p.98, Interpretation --- p.100, Chapter VII. --- SUPPORTIVE SERVICES FOR DIRECT MARKETING, Introduction --- p.104, Interview reports --- p.108, Times Direct Marketing --- p.109, Direct Force --- p.115, Ad-Post --- p.119, Nat Alan Direct --- p.124, H K Cable Communications Ltd --- p.130, Interpretation --- p.138, Chapter VIII. --- CONSUMERS ' ATTITUDES AND BEHAVIOURS TOWARDS DIRECT MARKETING A CONSUMER SURVEY ON DIRECT MAIL, Introduction --- p.142, Design of the survey instrument --- p.144, Observation of results by overall sample --- p.148, Observation of results by demographic segments and their interactions --- p.166, Utilization of mail order service for financial services --- p.186, Comparison between nominal variables and among batches --- p.189, Cable television --- p.194, Interpretation --- p.197, Chapter PART C --- CONCLUSION, Chapter IX. --- LIMITATIONS, Limitations --- p.200, Environmental factors (ch.3) --- p.201, Characteristics of direct marketing and features of financial services (ch. 4) --- p.201, Direct marketing as a total marketing concept (ch. 5) --- p.202, Application of direct marketing in the financial services industry (ch. 6) --- p.202, Supportive services for direct marketing (ch.7) --- p.203, Consumer survey on direct mail (ch. 8) --- p.204, Chapter X. --- CONCLUSION, Concluding remarks --- p.207, Recommendations --- p.211, Summary of Research --- p.216, BIBLIOGRAPHY --- p.218, APPENDICES --- p.Appendices 1 to9, http://library.cuhk.edu.hk/record=b5886370, Use of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/)