The topic of this thesis is "Psychosocial effects of the use of mobile phones in children under the age of 12 years." Children in connection with the use of mobile phones are more vulnerable compared to adults regarding the unwilling behavior. Czech public (neither lay nor professional) has not paid sufficient attention to this issue so far. The aim of this work was to monitor attitudes of children to mobile phones, the manner and extent of their use. At last but not at least, it was also the aim to describe the position of mobile service providers to child customers. There was also a market analysis carried out to describe offers, products and services suitable for children. The first part of this thesis describes the current situation in the Czech Republic and is complemented with statistical data of the numbers of mobile phones in the Czech Republic. There are also specifics of children as users of mobile phones mentioned and the risks that are connected to the use of mobile phones, such as reliance on mobile or nomophobia, fears of loss of signal etc. In the following chapters objectives of the research are described, hypotheses and research methodology. The results are shown in graphical form. They are followed by the results of market analysis and expert observations on the issue, the methodology and the research itself. The last part of this thesis is the discussion on the methodology and research results. Research results are also compared and discussed in relation to the literature.

published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

Public mobile phone use is often viewed negatively, although the reason for these negative perceptions is unclear. The current study examined perceptions of public mobile phone users in a 2 X 2 factorial design. Participants viewed a staged video of a public conversation that was either face-to-face or over a mobile and later rated their perception of the conversation and target speaker. Two variables were manipulated: whether participants could hear both sides or only one side of the conversation, and whether the conversation took place over a mobile phone or was face-to-face. The results indicated that the one side mobile phone conversation was more noticeable, intrusive, and annoying to overhear compared to the two-sided mobile speaker phone conversation and one side inaudible face-to-face conversation. Additionally, participants indicated that the target speaker in the one side mobile phone conversation was liked less than the target speaker in the mobile speaker phone condition and was perceived as more extroverted when participants could only hear one side of the conversation. The findings from this study are discussed in relation to previous data as to why public mobile phone conversations are generally perceived negatively by others. / Department of Psychological Science

M.Sc.(Eng.), Faculty of Engineering and the Built Environment, 2011 / The main objective of seamless mobility is to enable mobile users to stay connected while roaming across heterogeneous networks. As cellular networks evolve from the third generation Universal Mobile Telecommunication System (UMTS) to the Long Term Evolution (LTE), a new Evolved Packet Core (EPC) will support heterogeneous radio access networks on the same platform. UMTS provides voice services in the circuit switched domain; while LTE operates in the packet switched domain. Cellular network operators thus face the challenge of providing voice services during initial deployment of LTE due to difficulty in mobility between the two domains. Seamless voice handover between packet switched LTE and the circuit switched UMTS network is therefore an important tool in solving this problem. This report investigates the performance of inter-Radio Access Technology voice handover between LTE and UMTS. The schemes evaluated were Voice Call Continuity (VCC) for UMTS to LTE handover and Single Radio Voice Call Continuity (SRVCC) for LTE to UMTS handover. The performance evaluation was done using mathematical models and equations that were derived for the handover service interruption time. The resulting equations were simulated and the output was analysed and compared with the Third Generation Partnership Project (3GPP) specifications.

Thesis (M.M. (ICT Policy and Regulation))--University of the Witwatersrand, Faculty of Commerce, Law and Management, Graduate School of Public and Development Management, 2013. / Cannot copy abstract.

Thesis advisor: S. Anukriti / Since the launch of M-PESA in 2007, mobile money has created the potential to increase financial inclusion by providing a safe and convenient place to store wealth. This paper analyzes the impact of mobile money on savings practices in Sub-Saharan Africa. Using 2015 survey data from Uganda, Kenya, and Tanzania, I find that mobile money account holders are 10.9 percent more likely to save than non-account holders, holding constant other characteristics. Mobile money has a positive and significant impact on saving for daily consumption, for protection against income shocks, and for business and education investments. In addition, I find that mobile money is a complement to formal savings (bank accounts) and a substitute for informal savings. By increasing saving, mobile money better enables individuals to rely on savings in the event of a negative income shock. These results are consistent with a policy agenda that promotes financial inclusion by increasing access to mobile technologies. / Thesis (BA) — Boston College, 2017. / Submitted to: Boston College. College of Arts and Sciences. / Discipline: Departmental Honors. / Discipline: Economics.

[pt] Esta pesquisa procura entender melhor de que forma as operadoras de telefonia móvel podem configurar suas ofertas de pacotes de produtos e serviços, através de um estudo de percepção de valor por parte dos clientes que já utilizam os serviços. Através de questionários estruturados, procurou-se avaliar a questão da percepção de valor dos usuários, examinando a compensação entre o benefício que se recebe e o sacrifício dispendido para obter esses benefícios. Apesar de o preço ser, na maioria das vezes, o lado do sacrifício na relação de valor, os resultados mostram que os usuários estão dispostos a desembolsar uma quantia até 50 por cento maior para adquirir serviços cujas características sejam mais adequados a seus padrões de uso. / [en] The objective of this research is to understand how mbile phone operators can set their service bundling offers. An exploratory study, followed by a survey made through structured questionaries were done in order to evaluate the customers value perceptions. Value perceptions here is defined as the trade-off between the perceived benefits and the perceived sacrifice to obtain a given benefit. Although most of the times price is the sacrifice side on the perceived value relationship, the results show that on average the customers are willing to pay 50 percent more to have benefits that better fit and control their use standards.

by Kwan Lawrence Yeung. / Thesis (Ph.D.)--Chinese University of Hong Kong, 1995. / Includes bibliographical references (leaves 115-[118]). / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Cellular Concept --- p.1 / Chapter 1.2 --- Fixed Channel Assignment --- p.2 / Chapter 1.3 --- Dynamic Channel Assignment --- p.2 / Chapter 1.4 --- Performance Evaluation of DC A --- p.3 / Chapter 1.5 --- Han doff Analysis --- p.3 / Chapter 1.6 --- Mobile Location Tracking Strategies --- p.3 / Chapter 1.7 --- QOS Measure --- p.4 / Chapter 1.8 --- Organization of Thesis --- p.4 / Chapter 2 --- Optimization of Channel Assignment I --- p.6 / Chapter 2.1 --- Introduction --- p.6 / Chapter 2.2 --- Generating Compact Patterns --- p.7 / Chapter 2.2.1 --- Regular size cells --- p.7 / Chapter 2.2.2 --- Irregular size cells --- p.7 / Chapter 2.3 --- Nominal Channel Allocation Methods --- p.10 / Chapter 2.3.1 --- Compact pattern allocation --- p.10 / Chapter 2.3.2 --- Greedy allocation --- p.11 / Chapter 2.3.3 --- Hybrid allocation --- p.11 / Chapter 2.3.4 --- The K-Optimal variations --- p.11 / Chapter 2.3.5 --- Backtracking strategies --- p.12 / Chapter 2.4 --- Performance Comparison --- p.12 / Chapter 2.5 --- Conclusions --- p.16 / Chapter 3 --- Optimization of Channel Assignment II --- p.18 / Chapter 3.1 --- Introduction --- p.18 / Chapter 3.2 --- Basic Heuristics --- p.20 / Chapter 3.2.1 --- Two methods for cell ordering --- p.20 / Chapter 3.2.2 --- Two channel assignment strategies --- p.20 / Chapter 3.3 --- Channel Assignments with Cell Re-ordering --- p.21 / Chapter 3.3.1 --- Four channel assignment algorithms --- p.21 / Chapter 3.3.2 --- Complexity --- p.22 / Chapter 3.3.3 --- An example --- p.22 / Chapter 3.4 --- Channel Assignment at Hotspots --- p.23 / Chapter 3.4.1 --- Strategy F vs strategy R --- p.23 / Chapter 3.4.2 --- Strategy FR --- p.24 / Chapter 3.5 --- Numerical Examples --- p.25 / Chapter 3.5.1 --- "Performance of algorithms F/CR,F/DR,R/CR and R/DR" --- p.26 / Chapter 3.5.2 --- Effect of X & Y on performance of algorithms FR/CR & FR/DR --- p.26 / Chapter 3.5.3 --- Performance of algorithms FR/CR & FR/DR --- p.27 / Chapter 3.6 --- Conclusions --- p.27 / Chapter 4 --- Compact Pattern Based DCA --- p.29 / Chapter 4.1 --- Introduction --- p.29 / Chapter 4.2 --- Compact Pattern Channel Assignment --- p.30 / Chapter 4.2.1 --- Data structures --- p.30 / Chapter 4.2.2 --- Two functions --- p.31 / Chapter 4.2.3 --- Two phases --- p.32 / Chapter 4.3 --- Performance Evaluation --- p.33 / Chapter 4.4 --- Conclusions --- p.36 / Chapter 5 --- Cell Group Decoupling Analysis --- p.37 / Chapter 5.1 --- Introduction --- p.37 / Chapter 5.2 --- One-Dimensional Cell Layout --- p.38 / Chapter 5.2.1 --- Problem formulation --- p.38 / Chapter 5.2.2 --- Calculation of blocking probability --- p.39 / Chapter 5.3 --- Two-Dimensional Cell Layout --- p.41 / Chapter 5.3.1 --- Problem formulation --- p.41 / Chapter 5.3.2 --- Calculation of blocking probability --- p.42 / Chapter 5.4 --- Illustrative Examples --- p.42 / Chapter 5.4.1 --- One-dimensional case --- p.42 / Chapter 5.4.2 --- Two-dimensional case --- p.45 / Chapter 5.5 --- Conclusions --- p.45 / Chapter 6 --- Phantom Cell Analysis --- p.49 / Chapter 6.1 --- Introduction --- p.49 / Chapter 6.2 --- Problem Formulation --- p.49 / Chapter 6.3 --- Arrival Rates in Phantom Cells --- p.50 / Chapter 6.4 --- Blocking Probability and Channel Occupancy Distribution --- p.51 / Chapter 6.4.1 --- Derivation of α --- p.51 / Chapter 6.4.2 --- Derivation of Bside --- p.52 / Chapter 6.4.3 --- Derivation of Bopp --- p.53 / Chapter 6.4.4 --- Channel occupancy distribution --- p.54 / Chapter 6.5 --- Numerical Results --- p.55 / Chapter 6.6 --- Conclusions --- p.55 / Chapter 7 --- Performance Analysis of BDCL Strategy --- p.58 / Chapter 7.1 --- Introduction --- p.58 / Chapter 7.2 --- Borrowing with Directional Carrier Locking --- p.58 / Chapter 7.3 --- Cell Group Decoupling Analysis --- p.59 / Chapter 7.3.1 --- Linear cellular systems --- p.59 / Chapter 7.3.2 --- Planar cellular systems --- p.61 / Chapter 7.4 --- Phantom Cell Analysis --- p.61 / Chapter 7.4.1 --- Call arrival rates in phantom cells --- p.62 / Chapter 7.4.2 --- Analytical model --- p.62 / Chapter 7.5 --- Numerical Examples --- p.63 / Chapter 7.5.1 --- Linear cellular system with CGD analysis --- p.63 / Chapter 7.5.2 --- Planar cellular system with CGD analysis --- p.65 / Chapter 7.5.3 --- Planar cellular system with phantom cell analysis --- p.65 / Chapter 7.6 --- Conclusions --- p.68 / Chapter 8 --- Performance Analysis of Directed Retry --- p.69 / Chapter 8.1 --- Introduction --- p.69 / Chapter 8.2 --- Directed Retry Strategy --- p.69 / Chapter 8.3 --- Blocking Performance of Directed Retry --- p.70 / Chapter 8.3.1 --- Analytical model --- p.70 / Chapter 8.3.2 --- Numerical examples --- p.71 / Chapter 8.4 --- HandofF Analysis for Directed Retry --- p.73 / Chapter 8.4.1 --- Analytical model --- p.73 / Chapter 8.4.2 --- Numerical examples --- p.75 / Chapter 8.5 --- Conclusions --- p.77 / Chapter 9 --- Handoff Analysis in a Linear System --- p.79 / Chapter 9.1 --- Introduction --- p.79 / Chapter 9.2 --- Traffic Model --- p.80 / Chapter 9.2.1 --- Call arrival rates --- p.80 / Chapter 9.2.2 --- Channel holding time distribution --- p.81 / Chapter 9.3 --- Analytical Model --- p.81 / Chapter 9.3.1 --- Handoff probability --- p.81 / Chapter 9.3.2 --- Handoff call arrival rate --- p.81 / Chapter 9.3.3 --- Derivation of blocking probability --- p.81 / Chapter 9.3.4 --- Handoff failure probability --- p.82 / Chapter 9.3.5 --- Finding the optimal number of guard channels --- p.83 / Chapter 9.4 --- Numerical Results --- p.83 / Chapter 9.4.1 --- System parameters --- p.83 / Chapter 9.4.2 --- Justifying the analysis --- p.84 / Chapter 9.4.3 --- The effect of the number of guard channels --- p.84 / Chapter 9.5 --- Conclusions --- p.85 / Chapter 10 --- Mobile Location Tracking Strategy --- p.88 / Chapter 10.1 --- Introduction --- p.88 / Chapter 10.2 --- Review of Location Tracking Strategies --- p.89 / Chapter 10.2.1 --- Fixed location area strategy --- p.89 / Chapter 10.2.2 --- Fixed reporting center strategy --- p.89 / Chapter 10.2.3 --- Intelligent paging strategy --- p.89 / Chapter 10.2.4 --- Time-based location area strategy --- p.89 / Chapter 10.2.5 --- Movement-based location area strategy --- p.90 / Chapter 10.2.6 --- Distance-based location area strategy --- p.90 / Chapter 10.3 --- Optimization of Location Area Size --- p.90 / Chapter 10.3.1 --- Location updating rates ´ؤ linear systems --- p.90 / Chapter 10.3.2 --- Location updating rates ´ؤ planar systems --- p.91 / Chapter 10.3.3 --- Optimal location area size ´ؤ linear systems --- p.92 / Chapter 10.3.4 --- Optimal location area size ´ؤ planar systems --- p.92 / Chapter 10.4 --- Comparison of FLA & DBLA Strategies --- p.93 / Chapter 10.5 --- Adaptive Location Tracking Strategy --- p.94 / Chapter 10.5.1 --- Mobility tracking --- p.94 / Chapter 10.5.2 --- Protocols for ALT strategy --- p.94 / Chapter 10.6 --- Numerical Examples --- p.95 / Chapter 10.7 --- Conclusions --- p.97 / Chapter 11 --- A New Quality of Service Measure --- p.99 / Chapter 11.1 --- Introduction --- p.99 / Chapter 11.2 --- QOS Measures --- p.99 / Chapter 11.3 --- An Example --- p.101 / Chapter 11.4 --- Case Studies --- p.101 / Chapter 11.5 --- Conclusions --- p.106 / Chapter 12 --- Discussions & Conclusions --- p.107 / Chapter 12.1 --- Summary of Results --- p.107 / Chapter 12.2 --- Topics for Future Research --- p.108 / Chapter A --- Borrowing with Directional Channel Locking Strategy --- p.110 / Chapter B --- Derivation of p2 --- p.112 / Chapter C --- Publications Derived From This Thesis --- p.114 / Bibliography --- p.115

For users away from the office or home, there is an increasing demand for mobile solutions that offer effective collaborative facilities on the move. The mobile cellular device, or “smart phone”, can offer a ubiquitous platform to deliver such services, provided that its many physical and technological constraints can be overcome. In an effort to better support mobile collaboration, this thesis presents a contributing Mobile Exchange Architecture (MEA) designed to improve upon the capabilities provided by mobile devices to enable synchronous exchange of digital media during a phone conversation using wireless networks and cellular devices. This research includes the design and development of one such MEA in the form of a fully functional Photo-conferencing service, supporting shared remote interaction techniques, simultaneous voice communication and seamless digital media exchange between remote and collocated mobile users. Furthermore, through systematic design, experimental evaluations and field studies we evaluate the effects of different shared remote interaction techniques – 'pointing', 'scaling', 'mixed' and 'hybrid' – assessing the task effort required by users when interacting around shared images across resource constrained mobile devices. This thesis presents a direction for the future development of technologies and methods to enable a new era of scalable always-to-hand mobile collaborative environments.

Weiyan Ge. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references (leaves 64-68). / Abstracts in English and Chinese. / Abstract --- p.ii / Acknowledgement --- p.iv / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Introduction of Power Control Problem --- p.2 / Chapter 1.1.1 --- Classification of Power Control Problem --- p.2 / Chapter 1.1.2 --- Previous Works --- p.7 / Chapter 1.2 --- Scope and Contribution of the Thesis --- p.11 / Chapter 1.3 --- Organization of the Thesis --- p.12 / Chapter 2 --- Background --- p.14 / Chapter 2.1 --- Stochastic Approximation --- p.14 / Chapter 2.2 --- Lognormal Distribution --- p.17 / Chapter 2.2.1 --- Definition and Properties --- p.17 / Chapter 2.2.2 --- Application on Radio Propagation --- p.18 / Chapter 3 --- System Model and Centralized Algorithm --- p.21 / Chapter 3.1 --- System Model --- p.21 / Chapter 3.2 --- Problem Statement and the Centralized Algorithm --- p.25 / Chapter 4 --- Proposed Stochastic Power Control Algorithm --- p.30 / Chapter 4.1 --- Proposed Power Control Algorithm --- p.30 / Chapter 4.2 --- Basic Properties of the Algorithm --- p.33 / Chapter 4.3 --- Convergence Property --- p.38 / Chapter 5 --- Numerical Results --- p.44 / Chapter 5.1 --- Simulation Model --- p.44 / Chapter 5.2 --- Numerical Results --- p.47 / Chapter 6 --- Conclusions And Future Works --- p.58 / Chapter 6.1 --- Conclusions --- p.58 / Chapter 6.2 --- Future Works --- p.60 / Chapter A --- Basic Properties of LOG-Distribution --- p.62 / Bibliography --- p.64