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Propagation prediction for PCS design in urban microwave channelsTran, Thuy Thomas 04 March 2009 (has links)
The increasing demand for greater capacity of mobile communications has led to the petition of more radio spectrum at 1900 MHz for the new personal communication service (PCS) systems. The PCS spectrum is proposed to coexist with current fixed microwave spectrum. This presents cochannel interference control problems which can be avoided with extensive propagation studies in both measurements and predictions. Currently, there is no readily available tool to predict propagation channels for the small coverage area that PCS operates at 1900 MHz.
This thesis presents new methods for propagation prediction without relying on measurements but rather local environment geometries and their electrical properties. The propagation prediction tool developed is based on the principle of geometrical optics and Fresnel-Kirchoff diffraction. Geometrical optics enables computer software to automatically trace the propagation of radio wave energy from the transmitter to the receiver. The ray tracing techniques presented are optimized for speed with a little trade-off in accuracy. Also, efficient techniques were developed to find true diffracting building edges in dense urban environments. The propagation prediction software also rely on other commercial software packages such as AutoCAD and GRASS to maintain and manipulate the environmental database as well as displaying prediction results. The software yielded reasonable accuracy when compared against VT campus propagation measurements at 900 MHz and 1900 MHz. / Master of Science
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Kartering van selfoontegnologieLochner, Hendrik Thomas 10 1900 (has links)
It is sincerely hoped that this work will motivate other researchers and in particular my colleagues to do further research in the field of cellphone technology, especially how it can be mapped to enable it to be utilised as evidence in our courts.
This research aims to develop the mapping of cellphone technology as an aid in the investigation of crime.
The mapping of cellphone technology refers to how cellphone technology can be utilised in crime investigation and in particular how a criminal can be placed at the scene of a crime, as a result of a cellphone call that was either made or received.
To place the suspect at the scene of a crime as a result of a call made or received, cellphone records and technology of the relevant cellphone company, as well as present computer programmes can be utilised. Shortly, it can be said that a criminal can geographically be placed within a space some where on this earth. / Criminology / M.Tech. (Forensic Investigation)
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Female entrepreneurs' cellular phone habits in Zambia and South AfricaKayamba, Mwanja 30 November 2007 (has links)
1 online resource (viii, 155 leaves) / This study explores the ways in which female entrepreneurs in Zambia and South Africa use their cellular phones, as well as their interests and needs in using this technology. The findings in this study are therefore crucial to the body of knowledge on programmes that seek to uplift women's lives through the deployment of ICTs, since current policies do not make full provision for the use of mobile phones in female entrepreneurship.
Information on female entrepreneurs and cellular phones was collected in the literature review. The scrutiny of various literature sources and the analysis of the responses from the interviews with the female entrepreneurs were carried out to arrive at answers to the following research questions:
1. Can telecommunications (specifically, cellular phones) increase the participation of women in the economy?
2. What are the consumer habits of female entrepreneur cellular phone users in Zambia and South Africa?
3. Are the communication needs of business women in Zambia and South Africa adequately met?
4. What are the obstacles that female entrepreneurs in Zambia and South Africa face in the use of cellular phones?
5. What are the similarities and differences in the consumer habits of female entrepreneur cellular phone users in Zambia and South Africa?
In order to gather information on the consumer habits of female entrepreneurs in Zambia and South Africa, a survey was conducted of 100 female entrepreneurs. The female entrepreneurs identified in this survey consist of female business owners with no more than 50 employees each, from Gauteng Province in South Africa, and Lusaka Province in Zambia. The female entrepreneurs were identified through the accidental sampling technique, and a structured questionnaire was used to collect information from them.
The findings of the investigation reveal that cellular phones have the potential to increase the participation of women in mainstream economic activity, since they are a useful means of communication that allow women from diverse backgrounds to communicate easily for both business and social purposes. Accordingly, national policy-makers in South Africa and Zambia need to investigate further the potential of using cellular phone or similar technology to empower small-scale businesswomen.
The investigation also shows that the cellular phone consumer habits of female entrepreneurs in Zambia and South Africa differ when it comes to using cellular phones for business and social communication purposes. More Zambian women indicated that they use their cellular phones in business operations, while South African women showed a tendency to use their phones more for social purposes.
The results of this investigation further illustrate that despite the importance in value which the mobile phone has for women entrepreneurs in both Zambia and South Africa, the communication needs of women's entrepreneurship are not adequately met. The main obstacles in meeting the communication needs of female entrepreneurs in Zambia and South Africa are inadequate network coverage and high prices. The study shows that a number of women (52,2%) indicated that they are inhibited from effective communication services and therefore resort to borrowing other people's mobile phones.
The lack of empirical studies on the use of telecommunications by female entrepreneurs in both Zambia and South Africa attests to the fact that women's entrepreneurship is still an area that requires in-depth investigation. If various development efforts are to meet their targets, clearly the area of women's entrepreneurship and how various ICTs such as cellular phones are used therein needs urgent investigation. / Communication Sciences / M. A. (International Communication)
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Female entrepreneurs' cellular phone habits in Zambia and South AfricaKayamba, Mwanja 30 November 2007 (has links)
1 online resource (viii, 155 leaves) / This study explores the ways in which female entrepreneurs in Zambia and South Africa use their cellular phones, as well as their interests and needs in using this technology. The findings in this study are therefore crucial to the body of knowledge on programmes that seek to uplift women's lives through the deployment of ICTs, since current policies do not make full provision for the use of mobile phones in female entrepreneurship.
Information on female entrepreneurs and cellular phones was collected in the literature review. The scrutiny of various literature sources and the analysis of the responses from the interviews with the female entrepreneurs were carried out to arrive at answers to the following research questions:
1. Can telecommunications (specifically, cellular phones) increase the participation of women in the economy?
2. What are the consumer habits of female entrepreneur cellular phone users in Zambia and South Africa?
3. Are the communication needs of business women in Zambia and South Africa adequately met?
4. What are the obstacles that female entrepreneurs in Zambia and South Africa face in the use of cellular phones?
5. What are the similarities and differences in the consumer habits of female entrepreneur cellular phone users in Zambia and South Africa?
In order to gather information on the consumer habits of female entrepreneurs in Zambia and South Africa, a survey was conducted of 100 female entrepreneurs. The female entrepreneurs identified in this survey consist of female business owners with no more than 50 employees each, from Gauteng Province in South Africa, and Lusaka Province in Zambia. The female entrepreneurs were identified through the accidental sampling technique, and a structured questionnaire was used to collect information from them.
The findings of the investigation reveal that cellular phones have the potential to increase the participation of women in mainstream economic activity, since they are a useful means of communication that allow women from diverse backgrounds to communicate easily for both business and social purposes. Accordingly, national policy-makers in South Africa and Zambia need to investigate further the potential of using cellular phone or similar technology to empower small-scale businesswomen.
The investigation also shows that the cellular phone consumer habits of female entrepreneurs in Zambia and South Africa differ when it comes to using cellular phones for business and social communication purposes. More Zambian women indicated that they use their cellular phones in business operations, while South African women showed a tendency to use their phones more for social purposes.
The results of this investigation further illustrate that despite the importance in value which the mobile phone has for women entrepreneurs in both Zambia and South Africa, the communication needs of women's entrepreneurship are not adequately met. The main obstacles in meeting the communication needs of female entrepreneurs in Zambia and South Africa are inadequate network coverage and high prices. The study shows that a number of women (52,2%) indicated that they are inhibited from effective communication services and therefore resort to borrowing other people's mobile phones.
The lack of empirical studies on the use of telecommunications by female entrepreneurs in both Zambia and South Africa attests to the fact that women's entrepreneurship is still an area that requires in-depth investigation. If various development efforts are to meet their targets, clearly the area of women's entrepreneurship and how various ICTs such as cellular phones are used therein needs urgent investigation. / Communication Sciences / M. A. (International Communication)
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Kartering van selfoontegnologieLochner, Hendrik Thomas 10 1900 (has links)
It is sincerely hoped that this work will motivate other researchers and in particular my colleagues to do further research in the field of cellphone technology, especially how it can be mapped to enable it to be utilised as evidence in our courts.
This research aims to develop the mapping of cellphone technology as an aid in the investigation of crime.
The mapping of cellphone technology refers to how cellphone technology can be utilised in crime investigation and in particular how a criminal can be placed at the scene of a crime, as a result of a cellphone call that was either made or received.
To place the suspect at the scene of a crime as a result of a call made or received, cellphone records and technology of the relevant cellphone company, as well as present computer programmes can be utilised. Shortly, it can be said that a criminal can geographically be placed within a space some where on this earth. / Criminology and Security Science / M.Tech. (Forensic Investigation)
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The use of mobile phones by Generation Y students at two universities in the city of JohannesburgKoutras, Eleni 30 June 2006 (has links)
The main purpose of this study was to examine the use of mobile phones by Generation Y students in the city of Johannesburg in order to increase understanding of this segment's consumer behaviour. Generation Y is an important market segment in that it is making more independent purchase-related decisions and has a large amount of disposable income. The primary data for this study is based on focus group interviews and a quantitative study of a sample of 200 Generation Y tertiary students. Some of the findings are as follows: * Generation Y's use of mobile phones: Generation Y respondents have owned a mobile phone for between three to five years; the majority own Nokia mobile phones, are on prepaid packages and are not big spenders on airtime; furthermore, SMS is seen as the most cost-effective way to communicate. * Competition in the mobile phone market: The perceptions of this segment are that Vodacom is the "cool" operator, MTN is the most "expensive" network operator and Cell C is "cheap and youthful". * Mobile phone brand awareness: Nokia was the most cited brand of mobile phone and was found to be the first choice of many of the respondents. Samsung was reported as the second most cited brand with Motorola, Siemens and Sony Ericsson following. The results have implications for network providers, handset manufacturers and marketers alike as they will ultimately improve these stakeholder's chances of marketing effectively to this dynamic youth market. / Business Management / M. Comm. (Business Management)
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Socioscope: Human Relationship and Behavior Analysis in Mobile Social NetworksZhang, Huiqi 08 1900 (has links)
The widely used mobile phone, as well as its related technologies had opened opportunities for a complete change on how people interact and build relationship across geographic and time considerations. The convenience of instant communication by mobile phones that broke the barrier of space and time is evidently the key motivational point on why such technologies so important in people's life and daily activities. Mobile phones have become the most popular communication tools. Mobile phone technology is apparently changing our relationship to each other in our work and lives. The impact of new technologies on people's lives in social spaces gives us the chance to rethink the possibilities of technologies in social interaction. Accordingly, mobile phones are basically changing social relations in ways that are intricate to measure with any precision. In this dissertation I propose a socioscope model for social network, relationship and human behavior analysis based on mobile phone call detail records. Because of the diversities and complexities of human social behavior, one technique cannot detect different features of human social behaviors. Therefore I use multiple probability and statistical methods for quantifying social groups, relationships and communication patterns, for predicting social tie strengths and for detecting human behavior changes and unusual consumption events. I propose a new reciprocity index to measure the level of reciprocity between users and their communication partners. The experimental results show that this approach is effective. Among other applications, this work is useful for homeland security, detection of unwanted calls (e.g., spam), telecommunication presence, and marketing. In my future work I plan to analyze and study the social network dynamics and evolution.
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Mobile media technologies and public space : a study of the effect of mobile, wireless and MP3 related technologies on human behaviour and interaction in shopping malls.Hiltermann, Jaqueline Elizabeth. January 2008 (has links)
This dissertation explores Mobile Media Technologies (MMT’s) namely, cellphones, laptops and MP3 players, and their prevalence in public space as well as how they are being used within the space. Much of my research analyses the impact of MMT’s on social behaviour and the extent to which they can be seen as the harbingers of a new “postmodern” form of social organisation. My research is predominantly an observational study which is conducted within the postmodern space of the shopping mall. Through my research I discuss the multiple spaces within the shopping mall environment and I explore how humans behave, interact and construct their identities within this space; these ideas are evaluated in terms of the “modern” and the “postmodern” paradigms. “Postmodernity” and “modernity” are not mutually exclusive and as a result there are ambivalences in terms of how individuals relate to how MMT’s are being used in public space. / Thesis (M.A.)-University of KwaZulu-Natal, Pietermaritzburg, 2008.
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Determining the feasibility of using mobile phones to strengthen the information management of preventative health care in South AfricaSnyders, Frans Johannes 12 1900 (has links)
Thesis (MEng)-- Stellenbosch University, 2013. / ENGLISH ABSTRACT: South Africa’s health sector has not yet shown enough improvement to reach the Millennium Development Goals related to health. One of the problem areas is the low infant and child vaccination coverage in certain areas of South Africa. The use of mobile phones in health care (mHealth) has the potential to strengthen the primary health care system through improved information management. A mobile health solution for vaccination (MHSV) can be used to improve information management of vaccinations, which in turn can improve vaccination coverage. However, the feasibility of implementing such an MHSV in the South African context is unknown.
This study therefore investigates the feasibility of using mobile phones to improve information management for child vaccinations in South Africa. Feasibility is determined by using a feasibility framework together with business model development.
The feasibility framework, which is informed by a literature study, surveys and a case study, determines the feasibility of an MHSV in terms of human factors, technical feasibility, information management, policies and ethics, and economics. It is found that an MHSV is feasible in South Africa, although certain areas pose challenges that will have to be considered.
Complementing the feasibility framework, business models are developed to suggest possible ways in which an MHSV can be deployed in South Africa. These models build on the results from the feasibility framework and are developed using Osterwalder’s business model canvas. The effect of the National Health Insurance (NHI) on these business models is also examined.
In order to validate the feasibility framework and business models, interviews were held with experts in health care and mobile phone solutions. These interviews show that the research is valid and that the feasibility framework and business models can be generalised to the wider field of mHealth solutions. / AFRIKAANSE OPSOMMING: Suid-Afrika se gesondheidsektor het nog nie genoeg verbetering getoon om die gesondheidsverwante Millenium Ontwikkelingsdoelwitte te bereik nie. Een van die probleemareas is die besondere lae inentingsdekking van babas en kinders in sekere gebiede van Suid-Afrika. Die gebruik van selfone vir gesondheidsorg hou die potensiaal in om die primêre gesondheidsorgstelsel te versterk deur inligtingsbestuur te verbeter. ’n Inentingsoplossing wat gebruik maak van selfone, bekend as ‘n “mobile health solution for vaccination” (MHSV), kan inligtingsbestuur van inentings verbeter, wat hoër inentingsdekking tot gevolg kan hê. Die haalbaarheid van die implementering van so ’n MHSV in die konteks van Suid-Afrika is egter onbekend.
Hierdie studie ondersoek dus die haalbaarheid daarvan om selfone te gebruik vir beter inligtingsbestuur van kinder-inenting in Suid-Afrika. Haalbaarheid word vasgestel deur ’n haalbaarheidsraamwerk en die ontwikkeling van besigheidsmodelle te gebruik.
Die haalbaarheidsraamwerk, wat toegelig word deur ’n literatuurstudie, vraelyste en ’n gevallestudie, bepaal die haalbaarheid van ’n MHSV in terme van menslike faktore, tegniese haalbaarheid, inligtingbestuur, beleid en etiek, en ekonomie. Daar word gevind dat ’n MHSV haalbaar is in Suid-Afrika, alhoewel sekere areas uitdagings inhou.
Die haalbaarheidsraamwerk word aangevul deur die ontwikkeling van besigheidsmodelle wat moontlike maniere voorstel waarop ’n MHSV in Suid-Afrika ontplooi kan word. Hierdie modelle word geskoei op die resultate van die haalbaarheidsraamwerk en word ontwikkel met behulp van Osterwalder se besigheidsmodelskema (“business model canvas”). Die effek van die nasionale gesondheidversekering op hierdie modelle word ook ondersoek.
Onderhoude met kundiges in die veld van selfoonoplossings vir gesondheidsorg word gebruik om die haalbaarheidsraamwerk en die besigheidsmodelle te valideer. Die onderhoude toon dat die navorsing geldig is en dat die haalbaarheidsraamwerk en besigheidsmodelle veralgemeen kan word na die wyer veld van selfoonoplossings vir gesondheidsorg.
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The use of mobile phones by Generation Y students at two universities in the city of JohannesburgKoutras, Eleni 30 June 2006 (has links)
The main purpose of this study was to examine the use of mobile phones by Generation Y students in the city of Johannesburg in order to increase understanding of this segment's consumer behaviour. Generation Y is an important market segment in that it is making more independent purchase-related decisions and has a large amount of disposable income. The primary data for this study is based on focus group interviews and a quantitative study of a sample of 200 Generation Y tertiary students. Some of the findings are as follows: * Generation Y's use of mobile phones: Generation Y respondents have owned a mobile phone for between three to five years; the majority own Nokia mobile phones, are on prepaid packages and are not big spenders on airtime; furthermore, SMS is seen as the most cost-effective way to communicate. * Competition in the mobile phone market: The perceptions of this segment are that Vodacom is the "cool" operator, MTN is the most "expensive" network operator and Cell C is "cheap and youthful". * Mobile phone brand awareness: Nokia was the most cited brand of mobile phone and was found to be the first choice of many of the respondents. Samsung was reported as the second most cited brand with Motorola, Siemens and Sony Ericsson following. The results have implications for network providers, handset manufacturers and marketers alike as they will ultimately improve these stakeholder's chances of marketing effectively to this dynamic youth market. / Business Management / M. Comm. (Business Management)
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