Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaves 128-132). Also available via the Internet.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaves 138-145). Also available via the Internet.

Thesis (master's)--Thammasat University, 1999. / Includes bibliographical references (leaves 125-128).

Thesis (MSc)--University of Stellenbosch, 2005. / ENGLISH ABSTRACT: Cellular network operators globally loose between 3% and 5% of their annual revenue to telecommunications fraud. Hence it is of great importance that fraud management systems are implemented to detect, alarm, and shut down fraud within minutes, minimising revenue loss. Modern proprietary fraud management systems employ (i) classification methods, most often artificial neural networks learning from classified call data records to classify new call data records as fraudulent or legitimate, (ii) statistical methods building subscriber behaviour profiles based on the subscriber’s usage in the cellular network and detecting sudden changes in behaviour, and (iii) rules and threshold values defined by fraud analysts, utilising their knowledge of valid fraud cases and the false alarm rate as guidance. The purpose of this thesis is to establish a context for and evaluate the performance of well-known data mining techniques that may be incorporated in the fraud detection process. Firstly, a theoretical background of various well-known data mining techniques is provided and a number of seminal articles on fraud detection, which influenced this thesis, are summarised. The cellular telecommunications industry is introduced, including a brief discussion of the types of fraud experienced by South African cellular network operators. Secondly, the data collection process and the characteristics of the collected data are discussed. Different data mining techniques are applied to the collected data, demonstrating how user behaviour profiles may be built and how fraud may be predicted. An appraisal of the performances and appropriateness of the different data mining techniques is given in the context of the fraud detection process. Finally, an indication of further work is provided in the conclusion to this thesis, in the form of a number of recommendations for possible adaptations of the fraud detection methods, and improvements thereof. A combination of data mining techniques that may be used to build a comprehensive fraud detection model is also suggested. / AFRIKAANSE OPSOMMING: Sellulêre netwerk operateurs verloor wêreldwyd tussen 3% en 5% van hul jaarlikse inkomste as gevolg van telekommunikasie bedrog. Dit is dus van die uiterse belang dat bedrog bestuurstelsels geïmplimenteer word om bedrog op te spoor, alarms te genereer, en bedrog binne minute te staak om verlies aan inkomste tot ’n minimum te beperk. Moderne gepatenteerde bedrog bestuurstelsels maak gebruik van (i) klassifikasie metodes, mees dikwels kunsmatige neurale netwerke wat leer vanaf geklassifiseerde oproep rekords en gebruik word om nuwe oproep rekords as bedrog-draend of nie bedrog-draend te klassifiseer, (ii) statistiese metodes wat gedragsprofiele van ’n intekenaar bou, gebaseer op die intekenaar se gedrag in die sellulêre netwerk, en skielike verandering in gedrag opspoor, en (iii) reëls en drempelwaardes wat deur bedrog analiste daar gestel word, deur gebruik te maak van hulle ondervinding met geldige gevalle van bedrog en die koers waarteen vals alarms gegenereer word. Die doel van hierdie tesis is om ’n konteks te bepaal vir en die werksverrigting te evalueer van bekende data ontginningstegnieke wat in bedrog opsporingstelsels gebruik kan word. Eerstens word ’n teoretiese agtergrond vir ’n aantal bekende data ontginningstegnieke voorsien en ’n aantal gedagteryke artikels wat oor bedrog opsporing handel en wat hierdie tesis beïnvloed het, opgesom. Die sellulêre telekommunikasie industrie word bekend gestel, insluitend ’n kort bespreking oor die tipes bedrog wat deur Suid-Afrikaanse sellulˆere telekommunikasie netwerk operateurs ondervind word. Tweedens word die data versamelingsproses en die eienskappe van die versamelde data bespreek. Verskillende data ontginningstegnieke word vervolgens toegepas op die versamelde data om te demonstreer hoe gedragsprofiele van gebruikers gebou kan word en hoe bedrog voorspel kan word. Die werksverrigting en gepastheid van die verskillende data ontginningstegnieke word bespreek in die konteks van die bedrog opsporingsproses. Laastens word ’n aanduiding van verdere werk in die gevolgtrekking tot hierdie tesis verskaf, en wel in die vorm van ’n aantal aanbevelings oor moontlike aanpassings en verbeterings van die bedrog opsporingsmetodes wat beskou en toegepas is. ’n Omvattende bedrog opsporingsmodel wat gebruik maak van ’n kombinasie van data ontginningstegnieke word ook voorgestel.

Thesis (MBA (Business Management))--Stellenbosch University, 2008. / ENGLISH ABSTRACT: The motive for this research was to provide clarity on the increasingly divergent opinions on the role and behaviour of South African companies in the rest of the African continent. The key question that can be asked is: “Are South African investments, saviour or villain of African Development” (Thomas, 2007)? Are they “exporting Apartheid” (Mkhabela, 2007) or are the fears raised against South African companies unfounded? The primary research objective of this study is to assess MTN-C’s contribution to the economic development of Cameroon. The specific research questions addressed in this study are: 1. What are the possible areas of economic impact? 2. How can the effects of MTN-C’s presence in Cameroon be measured—both qualitatively and quantitatively? 3. What recommendations can be made to MTN-C? To answer these questions, the researcher takes a multi-dimensional view of the economic impact across eight areas, viz., inflow of foreign direct capital, interaction with government, training and development of local staff, employment creation, local procurement, spread of local shareholding, the local mobile communications sector and corporate social investment initiatives. She assesses each of the above-mentioned eight elements and then draws some conclusions on what is perceived to be the true effect of MTN-C’s investments in Cameroon. After close to three years of in-depth research, which included several trips to Cameroon, in-depth interviews with key stakeholders, direct observation, group discussions and survey research, it can be concluded that MTN-C has indeed had a positive impact in areas like Corporate Social Investment, training and development of local staff, employment creation and the inflow of foreign capital. However, much still needs to be done. The areas that have been identified as weak include the development of local suppliers, the interaction with government and the spread of local shareholding. / AFRIKAANSE OPSOMMING: Die studie is gemotiveer deur die soeke na groter helderheid met betrekking tot uiteenlopende beoordelings van die rol en optrede van Suid-Afrikaanse ondernemings in die res van die Afrika-kontinent. Die kernvraag is: “Are South African investments saviour or villains of African development?” (Thomas, 2007) Is hulle besig om apartheid “uit te voer” (Mkhabela, 2007) of is dié vrese teenoor Suid-Afrikaanse ondernemings ongegrond? Die primêre navorsingsoogmerk is die beoordeling van MTN Cameroon se bydrae tot die ekonomiese ontwikkeling in Kameroen. Spesifiek drie vrae word aangespreek. 1. Watter dimensies word ingesluit in ‘n studie van die “ekonomiese impak”? 2. Hoe kan die invloed van MTN Cameroon se teenwoordigheid in dié land gemeet word – sowel kwalitatief asook kwantitatief? 3. Watter aanbevelings kan op grond van dié beoordelings aan die maatskappy gemaak word? Om hierdie vrae te beantwoord word ‘n multi-dimensionele benadering gevolg, gebaseer op agt verskillende invloed-gebiede. Hulle sluit in die invloei van buitelandse kaptiaal, interaksie met die regering, opleiding en ontwikkeling van plaaslike werknemers, werkskepping, plaaslike aankope, die verspreiding van plaaslike aandeelhouding, die mobiele kommunikasiebedryf en sosiale investerings-inisiatiewe. Elkeen van dié elemente word ontleed op grond van vraelys-reaksies en ander insigte. Dit lei tot gevolgtrekkings op elkeen van die vlakke, wat tesame die volle omvang van die betrokkenheid weerspieël. Na drie jaar se interaksie van die navorser met Kameroen, diepte-onderhoude met vername rolspelers, direkte waarnemings, groepbesprekings en 40 voltooide vraelyste kom sy tot die gevolgtrekking dat MTN Cameroon wel ‘n positiewe rol speel in gebiede soos korporatiewe sosiale investerings, opleiding, werkskepping en die invloei van kapitaal, maar dat daar nog heelwat ruimte vir verbeterings is, veral wat plaaslike aankope, interaksie met die regering en plaaslike aandeelhouding betref.

published_or_final_version / Business Administration / Master / Master of Business Administration

Competition in the mobile services industry is intense, with players in the industry offering generally similar subscription plans. Opportunities are few for differentiating one service provider from another. In the light of prior research suggesting value is multi-dimensional, the present study, which examines how these dimensions impact customer satisfaction and repurchase intentions, provides differentiation opportunities for mobile service providers through focusing on value dimensions that are important to customers. Of six perceived value dimensions examined in the present research, value for money, reputation and social value dimensions had significant effects on customer satisfaction and repurchase intentions. One way for companies in the highly commoditized mobile service industry to minimize customer defection is to enhance their relationships with customers. However, as relationship building comes with a cost, it is of interest for companies to know whether certain customer groups will reciprocate more than others with loyalty if they are satisfied. The results from the present study show customer relationship inclination, the customer attribute examined, did not moderate the relationship between customer satisfaction and repurchase intention. Finally, recent studies have differentiated measures of repurchase intentions on the basis of volition levels and have suggested that better model fit can be achieved when higher volition measures are used. Intentions-as-expectations represents the lower volition end and intentions-as-wants represents the higher volition end of intention measure. However, the present study did not find any significant differences in model fit with the different intention measures used.

<p>This thesis investigates the use of mobile phones as service-delivery devices in a sign language machine translation system. Four sign language visualization methods were evaluated on mobile phones. Three of the methods were synthetic sign language visualization methods. Three factors were considered: the intelligibility of sign language, as rendered by the method / the power consumption / and the bandwidth usage associated with each method. The average intelligibility rate was 65%, with some methods achieving intelligibility rates of up to 92%. The average le size was 162 KB and, on average, the power consumption increased to 180% of the idle state, across all methods. This research forms part of the Integration of Signed and Verbal Communication: South African Sign Language Recognition and Animation (SASL) project at the University of the Western Cape and serves as an integration platform for the group's research. In order to perform this research a machine translation system that uses mobile phones as service-delivery devices was developed as well as a 3D Avatar for mobile phones. It was concluded that mobile phones are suitable service-delivery platforms for sign language machine translation systems.</p>

<p>This thesis investigates the use of mobile phones as service-delivery devices in a sign language machine translation system. Four sign language visualization methods were evaluated on mobile phones. Three of the methods were synthetic sign language visualization methods. Three factors were considered: the intelligibility of sign language, as rendered by the method / the power consumption / and the bandwidth usage associated with each method. The average intelligibility rate was 65%, with some methods achieving intelligibility rates of up to 92%. The average le size was 162 KB and, on average, the power consumption increased to 180% of the idle state, across all methods. This research forms part of the Integration of Signed and Verbal Communication: South African Sign Language Recognition and Animation (SASL) project at the University of the Western Cape and serves as an integration platform for the group's research. In order to perform this research a machine translation system that uses mobile phones as service-delivery devices was developed as well as a 3D Avatar for mobile phones. It was concluded that mobile phones are suitable service-delivery platforms for sign language machine translation systems.</p>

Masters of Science / This thesis investigates the use of mobile phones as service-delivery devices in a sign language machine translation system. Four sign language visualization methods were evaluated on mobile phones. Three of the methods were synthetic sign language visualization methods. Three factors were considered: the intelligibility of sign language, as rendered by the method; the power consumption; and the bandwidth usage associated with each method. The average intelligibility rate was 65%, with some methods achieving intelligibility rates of up to 92%. The average size was 162 KB and, on average, the power consumption increased to 180% of the idle state, across all methods. This research forms part of the Integration of Signed and Verbal Communication: South African Sign Language Recognition and Animation (SASL) project at the University of the Western Cape and serves as an integration platform for the group's research. In order to perform this research a machine translation system that uses mobile phones as service-delivery devices was developed as well as a 3D Avatar for mobile phones. It was concluded that mobile phones are suitable service-delivery platforms for sign language machine translation systems. / South Africa