published_or_final_version / Business Administration / Master / Master of Business Administration

Kwok Pui-ho. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves [79]-85). / Abstracts in English and Chinese. / Chapter CHAPTER 1 --- INTRODUCTION --- p.1 / Chapter CHAPTER 2 --- NONLINEAR BEHAVIOR OF RF POWER AMPLIFIERS --- p.5 / Chapter 2.1 --- Single Tone Excitation --- p.6 / Chapter 2.1.1 --- AM-AM Conversion --- p.7 / Chapter 2.1.2 --- AM-PM Conversion --- p.9 / Chapter 2.2 --- Two-Tone Excitation --- p.11 / Chapter 2.2.1 --- Intermodulation Distortion --- p.12 / Chapter 2.3 --- Digitally Modulated Signal Excitation --- p.13 / Chapter 2.3.1 --- Spectral Regeneration --- p.14 / Chapter 2.3.2 --- Adjacent Channel Power Ratio (ACPR) --- p.16 / Chapter CHAPTER 3 --- LINEARIZATION TECHNIQUES --- p.18 / Chapter 3.1 --- pre-distortion --- p.20 / Chapter 3.2 --- Feed-forward Techniques --- p.23 / Chapter 3.3 --- Harmonics Control Techniques --- p.24 / Chapter CHAPTER 4 --- SPECTRAL REGROWTH ANALYSIS USING VOLTERRA SERIES METHOD --- p.26 / Chapter 4.1 --- Introduction To Volterra Series Analysis --- p.27 / Chapter 4.1.1 --- Linear and Nonlinear Systems --- p.27 / Chapter 4.1.2 --- Evaluation of Volterra transfer function --- p.29 / Chapter 4.1.3 --- Volterra Series Analysis of Spectral Regrowth --- p.31 / Chapter 4.2 --- Nonlinear Model of GaAs MESFET Device --- p.33 / Chapter 4.3 --- Evaluation Of Nonlinear Responses --- p.35 / Chapter 4.3.1 --- First-Order Response --- p.36 / Chapter 4.3.2 --- Second-Order Response --- p.38 / Chapter 4.3.3 --- Third-Order Response --- p.39 / Chapter CHAPTER 5 --- EFFECT OF HARMONIC TUNING ON SPECTRAL REGROWTH --- p.42 / Chapter 5.1 --- Simulation of Digitally Modulated Signal --- p.43 / Chapter 5.2 --- Effect of Source Second Harmonic Termination --- p.44 / Chapter CHAPTER 6 --- EXPERIMENTAL VERIFICATION --- p.48 / Chapter 6.1 --- Circuit Design and Construction --- p.49 / Chapter 6.2 --- Setup and Measurement --- p.55 / Chapter 6.3 --- Experimental Results --- p.56 / Chapter 6.3.1 --- Small Signal Measurement --- p.56 / Chapter 6.3.2 --- Single Tone Characterization --- p.57 / Chapter 6.3.3 --- Two-Tone Characterization --- p.59 / Chapter 6.3.4 --- ACPR Characterization --- p.60 / Chapter 6.4 --- Comparison of Measurement and Simulation --- p.66 / Chapter CHAPTER 7 --- NONLINEAR TRANSCONDUCTANCE COEFFICIENTS EXTRACTION --- p.68 / Chapter 7.1 --- Large Signal Model --- p.69 / Chapter 7.2 --- Extraction of Nonlinear Transconductance --- p.71 / Chapter 7.2.1 --- Extraction of g1 --- p.71 / Chapter 7.2.2 --- Extraction of g2 and g3 --- p.72 / Chapter CHAPTER 8 --- CONCLUSION --- p.76 / FUTURE WORK RECOMMENDATION --- p.78 / REFERENCE

The area of deterministic noise cancellation in mobile radio communication systems is investigated and analyzed. Several interoperation problems in the mobile wireless radio space are identified and interference concerns for the Bluetooth - WLAN networks are characterized and quantified in the physical layer. A mathematical framework has been created for describing interference in the 2.4 GHz band. An adaptive noise suppression system has been developed that is able to alleviate the encroachment of the aggressor signal on the victim without sacrificing any of the original signal. This system is demonstrated to improve the victim SNR in a spread spectrum communication scenario. The research is extended to construct an interference canceller that is easy to assimilate into existing RF front-ends. A low-power small form-factor analog active canceller has been designed in 0.18-ìm Si-CMOS IC technology that delivers adequate noise suppression performance while operating in the RF domain. This includes novel implementations of phase rotator circuits based on delay interpolation and an integrated low-current quadrature modulator-based continuously variable analog phase shifter. This canceller is capable of up to 30 dB of in-band cancellation for the Bluetooth - WLAN problem. Other versions of the canceller are configured to protect GPS and DVB-H receivers from unintentional radiators transmitting in the vicinity. These demonstrate noise mitigation of at least 15 dB in their respective bands while generating very low broadband noise at the output. A simple low-power mixed-signal automatic control mechanism is also developed to operate the canceller adaptively. The work described in this dissertation advances the state-of-the-art in the area of mobile wireless radio coexistence.

Opening part of this paper is dedicated to the ongoing shift in social communication paradigm. An introduction to the subject of new media, web 2.0 concepts and social network sites phenomenon is followed by a discussion of integration possibilities of particular web 2.0 services. Some concerns about privacy, security, legislative framework and general openness of such system are discussed afterwards. A real case study of community virtualization process is introduced in the second part of this thesis. The case takes place in community of local non-profit club of youth and children. First, it is carried out an analysis of the communication receiver groups and the message types. We also describe the ongoing project of launching a new web site (made from several integrated web 2.0 services) and partial results of pilot implementation. Finally, the plan of the next integration steps is designed.

Traditional transport companies usually focus on achieving economies of scale in supply chain management. At the same time, the managers of transport companies aiming to achieve sustainability often do not consider the barriers needed to overcome to achieve a sustainable supply chain. However, due to the increasing demand for sustainable products and business methods, sustainable supply chain management increasingly plays a crucial role in changing and diverting the focus on environmental, social and economic impact. Transport companies around the globe are increasingly aiming to reduce carbon emissions and eliminate biodiversity loss. The sustainability issues with transport in supply chain management have been a critical field of research for decades, and with the integration of technology, new ways of achieving sustainability are possible. This thesis analyses a phenomenon using multiple cases to investigate the barriers transport companies face to adopting IoT. Also, it deals with how communication service providers might be able to offer solutions to the barriers presented in this thesis.  A qualitative method has been used to approach the research topic. The findings will represent the ways of achieving a more efficient and sustainable supply chain, particularly in the transport sector. Interviews were conducted with multiple industry experts. The study aims to identify the barriers to adopting IoT, which can create a sustainable supply chain for transport companies. The results emphasise the barriers transport companies have to deal with internally and externally. Internally a company might struggle to strategise an infrastructural investment, train the existing workforce, and collaborate knowledge share among different departments. Externally, transport companies or communication service providers (CSP) will face limited resources, stakeholders' investment in the IoT ecosystem, demand for IoT and sustainable supply chain, privacy issues, compatibility issues and lack of skilled labour.

Digitala kommunikationstjänster som chattbotar och virtuella assistenter blir alltmer förekommande och populärt för företag och organisationer att använda sig av. Chattboten och den virtuella assistenten är besläktade datorsystem uppbyggda med bakomliggande teknik som syftar till att efterlikna mänskliga samtal på ett så realistiskt sätt som möjligt. Företag och organisationer använder dessa digitala kommunikationsverktyg både för interna- och externa bruk som ett kundtjänstalternativ. Vid användning av dessa digitala kommunikationstjänster tillkommer en rad utmaningar. Denna studie ämnar ta reda på de främst förekommande för- och nackdelarna. Studien har genomförts i form av intervjuer med sex svenska storföretag som implementerat chattboten eller den virtuella assistenten på sin webbplats och/eller använder den som ett hjälpmedel internt. En av studiens intervjuade kandidater är utvecklare av virtuell assistans och använder inte verktyget själva. Studiens insamlade resultat från intervjuerna visar att de främst förekommande fördelarna med en chattbot eller virtuell assistent är 1) Tillgängligheten dygnet runt, 2) Den smidiga övergången från chatt till mänsklig handläggare, och 3) Hantering av monotona enkla arbetsuppgifter. De främst förekommande nackdelarna är 1) Systemet tränas med felaktiga data, 2) Olika information når kunden från chattboten och en mänsklig handläggare, och 3) För höga förväntningar på systemet från början. Studiens sammanfattade slutsats är att chattboten och den virtuella assistenten kräver kontinuerligt bakomliggande arbete för att upprätthålla en så god användarupplevelse som möjligt. / Digital communication services such as chatbots and virtual assistants are becoming more common and popular for companies and organizations to use. The chatbot and the virtual assistant are related computer systems built with underlying technology that aims to mimic human conversations in a way as realistic as possible. Companies and organizations use these digital communication tools for both internal and external use as a customer service alternative. When using these digital communication services, several challenges arise. This study intends to find out the main advantages and disadvantages. The study was conducted in the form of interviews with six Swedish companies that have implemented the chatbot or the virtual assistant on their website and/or use it as assistance internally. One of the study's interviewed candidates is a developer of virtual assistance and does not use it themselves within the company. The study's collected results from the interviews show that the main advantages of a chatbot or virtual assistant are 1) Accessibility around the clock, 2) The smooth transition from chat to human administrator, and 3) Handling of monotonous simple tasks. The main disadvantages are 1) The system is trained with incorrect data, 2) Different information reaches the customer from the chatbot and a human administrator, and 3) Too high expectations of the system from the beginning. The study's summary conclusion is that the chatbot and the virtual assistant require continuous underlying work to maintain as good a user experience as possible.

by Lam Wai-Tat. / Two pamphlets inserted. / Thesis (M.B.A.)--Chinese University of Hong Kong, 1997. / Includes bibliographical references (leaves 123-127). / APPROVAL --- p.i / ABSTRACT --- p.ii / TABLE OF CONTENTS --- p.iii / LIST OF FIGURES --- p.vi / CHAPTER / Chapter I. --- INTRODUCTION --- p.1 / Chapter II. --- COMPANY BACKGROUND AND OBJECTIVES --- p.2 / Nortel and Nortel China --- p.2 / Corporate Goal --- p.5 / Goal of Nortel China --- p.5 / Product Group Goal (Wireless) --- p.6 / Chapter III. --- RESEARCH OBJECTIVES AND DESIGN --- p.7 / Research Objectives --- p.7 / Research Design --- p.7 / Market Survey --- p.8 / Survey Design --- p.9 / Survey Results --- p.9 / Chapter IV. --- PRODUCT AND MARKET BACKGROUND --- p.12 / Wireless Communication Standards --- p.12 / Wireless Phone Types --- p.13 / Wireless Telecommunication Network Markets --- p.13 / Wireless Communications Equipment Market --- p.14 / Cellular Handsets --- p.15 / Chapter V. --- MARKETING ENVIRONMENT AND TRENDS - MACRO --- p.17 / General China Economy --- p.17 / Telecommunication Services and Regulation --- p.18 / Ministry of Posts and Telecommunications (MPT) --- p.18 / Directorate General of Telecommunications (DGT) --- p.19 / Provincial Post and Telecommunication Administration (PTAs) and Local Telecom Bureaus --- p.19 / State Radio Regulatory Commission --- p.19 / Type Approval Procedure --- p.20 / Imported Pagers and Mobile Phones --- p.20 / Pagers and Mobile Phones Assembled or Manufactured in Mainland China --- p.21 / Cellular Operators --- p.21 / MPT --- p.22 / Unicom --- p.23 / CESEC --- p.24 / Tariff Structure - Mobile Services --- p.24 / Liberalization of Telecom Services --- p.25 / China Unicom --- p.25 / Liberalization of the Retail Market --- p.26 / China Consumer Market Size --- p.26 / China's Growing Urbanization --- p.28 / Cultural Forces --- p.30 / Technological Direction --- p.31 / Chapter VI. --- MARKETING ENVIRONMENT AND TRENDS - MICRO --- p.34 / Direct and Substitute Competition --- p.34 / Mobile Satellite Services --- p.34 / Nortel China Resources --- p.34 / Supplier Influence --- p.35 / End Customers --- p.35 / Consumer Profiles --- p.36 / Consumption Trends --- p.38 / Consumer Buying Decision Process --- p.38 / Cellular Handset Market Share --- p.40 / Competitors --- p.41 / Ericsson --- p.41 / Motorola --- p.42 / Nokia --- p.43 / Cellular Handsets in China (Competitive Products in the Market) --- p.44 / Nortel Wireless Handset Product Portfolio --- p.44 / Chapter VII. --- SWOT ANALYSIS OF NORTEL --- p.46 / Chapter VIII. --- STRATEGIES --- p.48 / Marketing Objectives and Strategies --- p.48 / Market Potential --- p.49 / Nortel's Position --- p.49 / Target Customer --- p.50 / Target Markets by Geographic Location --- p.52 / Beijing --- p.52 / Cellular network --- p.53 / Strategic relationship --- p.54 / Shanghai --- p.54 / Cellular network --- p.54 / Strategic relationship --- p.55 / Guangzhou --- p.55 / Cellular network --- p.56 / Strategic relationship --- p.56 / Target Markets by Demographics --- p.56 / Competitive/Differential Advantages --- p.58 / Chapter IX. --- MARKETING PROGRAM --- p.61 / Product --- p.61 / Core Product --- p.62 / Tangible Product --- p.62 / Augmented Product --- p.63 / Product Evolution --- p.64 / Distribution --- p.66 / Identification of Channel Members --- p.66 / Phase I --- p.67 / Primary distribution --- p.67 / Secondary distribution --- p.68 / Phase II --- p.68 / Physical Distribution --- p.69 / Promotion --- p.71 / Summary of Nortel's Current Promotional Activities --- p.73 / Advertising --- p.73 / TV commercial #1 (corporate) --- p.73 / TV commercial #2 (product) --- p.74 / Newspaper advertisements --- p.75 / "Magazine advertisements and ""advertorials""" --- p.75 / Outdoor advertising --- p.75 / Personal Selling --- p.76 / Sales Promotions --- p.77 / Point-of-purchase materials --- p.77 / Trade shows and exhibitions --- p.77 / Consumer promotions (replacement promotions) --- p.78 / Trade promotions (trade rebates) --- p.78 / Sales forces promotion --- p.78 / Product demonstrations --- p.79 / Sponsorship --- p.79 / Publicity --- p.80 / Budget --- p.80 / Pricing --- p.82 / Mobile Handset Prices and Service Charges in China --- p.82 / Estimated Costs of Other Vendors' Handsets --- p.82 / Pricing Considerations --- p.83 / Revenue Analysis --- p.84 / Chapter X. --- LIMITATIONS --- p.87 / Chapter XI. --- CONCLUSION --- p.89 / ABBREVIATIONS AND ACRONYMS --- p.90 / APPENDIX 1 --- p.91 / APPENDIX 2 --- p.96 / APPENDIX 3 --- p.100 / APPENDIX 4 --- p.102 / APPENDIX 5 --- p.104 / APPENDIX 6 --- p.105 / APPENDIX 7 --- p.107 / APPENDIX 8 --- p.109 / APPENDIX 9 --- p.111 / APPENDIX 10 --- p.113 / APPENDIX 11 --- p.115 / APPENDIX 12 --- p.116 / APPENDIX 13 --- p.118 / APPENDIX 14 --- p.119 / APPENDIX 15 --- p.122 / BIBLIOGRAPHY --- p.123

by Ho Ka Pui. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1997. / Includes bibliographical references (leaves 78-82). / Abstract --- p.iii / Acknowledgments --- p.v / Introduction --- p.1 / Chapter One --- From Monopoly Telephony to the Rise of Cellular Communication --- p.17 / Chapter Two --- Oligopoly of the Cellular Communication Market in the Digital Era --- p.36 / Chapter Three --- The Irony of a Free Market Place --- p.53 / Chapter Four --- Cellular Communication Market and1997 --- p.67 / Conclusion --- p.72 / Bibliography --- p.78

Rural communities have been disconnected from the global world in the past due to lack of infrastructure that rendered connectivity a challenge for them. Recent developments in information and communication technology (ICT) have led to improved connectivity in these areas. As a result, mobile phones have become ubiquitous in these rural communities. A matrix was proposed in this study in order to evaluate and assess the impact of mobile devices on development of the rural communities. Existing measurement tools have not yet explored how the usages of mobile phones and other ICTs are impacting the lives of people in rural communities of South Africa. The aim of this study was to understand the existing criteria used to measure the impact of ICTs in rural communities. This was be achieved by focusing on the use of mobile phones in the community of Phake Rebone, taking into account different users. Once this was established, the study had a primary objective to design a matrix that would assist in evaluating and assessing the impact of a mobile phone in social activities such as learning, business and governance. This was achieved by using a case study method, employing qualitative and quantitative research methods. Cases within a case study were used to uncover how the core groups within the community used the mobile phone. A mixed method approach was used in data gathering and analysis to enable the researcher to identify usages and challenges related to the mobile phones. Data was collected from 401 participants and was analysed through the computer-aided tools such GoogleDocs and Microsoft Excel. The findings of the study showed a greater usage of the mobile phone. The literature findings of the use of the mobile phone for basic communication as well as growing adoption of applications such as social media and Internet were confirmed. The use in community related activities and work purposes that impacted the community members were minimal. The need of training to gain knowledge on how to use the device more effectively was established. The proposed matrix therefore seemed v relevant not only to measure impact but also to highlight the areas in which the community members can be trained on. The noted usage trends and needs by the community were then used to formulate indicators that could be used for the matrix. The indicators were then used to develop a matrix that could be used by community members and other interested parties to measure the impact of mobile phone on development of the users. The results of the matrix were also proved to be efficient in assisting individual users in recording the skills acquired through the use of the mobile phone. The matrix can be used in consultation with the guidelines that were formulated to ensure that each user, particularly from rural communities, benefits from such an evaluation tool / Development Studies / D. Litt. et Phil. (Development Studies)

The main objectives of this research are to investigate and design low profile antennas for mobile handsets applications using the balanced concept. These antennas are considered to cover a wide range of wireless standards such as: DCS (1710¿1880 MHz), PCS (1850¿1990 MHz), UMTS (1920¿2170 MHz), WLAN (2400¿2500 MHz and 5000 ¿ 5800 MHz) and UWB frequency bands. Various antennas are implemented based on built-in planar dipole with a folded arm structure. The performance of several designed antennas in terms of input return loss, radiation patterns, radiation efficiency and power gain are presented and several remarkable results are obtained. The measurements confirm the theoretical design concept and show reasonable agreement with computations. The stability performance of the proposed antenna is also evaluated by analysing the current distribution on the mobile phone ground plane. The specific absorption rate (SAR) performance of the antenna is also studied experimentally by measuring antenna near field exposure. The measurement results are correlated with the calculated ones. A new dual-band balanced antenna using coplanar waveguide structure is also proposed, discussed and tested; this is intended to eliminate the balanced feed network. The predicted and measured results show good agreement, confirming good impedance bandwidth characteristics and excellent dual-band performance. In addition, a hybrid method to model the human body interaction with a dual band balanced antenna structure covering the 2.4 GHz and 5.2 GHz bands is presented. Results for several test cases of antenna locations on the body are presented and discussed. The near and far fields were incorporated to provide a full understanding of the impact on human tissue. The cumulative distribution function of the radiation efficiency and absorbed power are also evaluated. / UK Engineering and Physical Sciences Research Council (EPSRC)