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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Cottage mobile phones in China

Cai, Guangning January 2010 (has links)
No description available.

Cottage mobile phones in China

Cai, Guangning January 2010 (has links)
No description available.

Mobile application development in Africa

Rugunda, Solomon Mugume 21 February 2011 (has links)
This work takes a look at how some of the challenges facing the African Continent can be tackled by the use of Mobile Phone Applications. Mobile phone penetration in Africa is very high, as indicated by statistics from South Africa in 2009 which showed that 70% of all South Africans owned a cell-phone. As such, the mobile phone is the ideal infrastructure platform to introduce technology applications that can be easily accessed by the general public. The paper briefly discusses the current state of mobile applications on the continent including some key applications presently deployed and how they are being used to meet some major social challenges faced. The work then proposes the creation of the Mobile Doctor Application, a tool that gives simple solutions to end-users in response to their health related text message queries. The key stakeholders for this application and their respective roles are then discussed. The paper then details the requirements for the application, separates them logically and represents them graphically for a clear understanding. Also put forth are two possible different sets of architecture for this application, one fully manual and the other using different sets of technologies. Finally, each architecture is evaluated using compliance metrics and the ATAM Quality Attribute Tree / text

A Driver, Vehicle and Road Safety System Using Smartphones

Gozick, Brandon 05 1900 (has links)
As vehicle manufacturers continue to increase their emphasis on safety with advanced driver assistance systems (ADAS), I propose a ubiquitous device that is able to analyze and advise on safety conditions. Mobile smartphones are increasing in popularity among younger generations with an estimated 64% of 25-34 year olds already using one in their daily lives. with over 10 million car accidents reported in the United States each year, car manufacturers have shifted their focus of a passive approach (airbags) to more active by adding features associated with ADAS (lane departure warnings). However, vehicles manufactured with these sensors are not economically priced while older vehicles might only have passive safety features. Given its accessibility and portability, I target a mobile smartphone as a device to compliment ADAS that can bring a driver assist to any vehicle without regards for any on-vehicle communication system requirements. I use the 3-axis accelerometer of multiple Android based smartphone to record and analyze various safety factors which can influence a driver while operating a vehicle. These influences with respect to the driver, vehicle and road are lane change maneuvers, vehicular comfort and road conditions. Each factor could potentially be hazardous to the health of the driver, neighboring public, and automobile and is therefore analyzed thoroughly achieving 85.60% and 89.89% classification accuracy for identifying road anomalies and lane changes, respectively. Effective use of this data can educate a potentially dangerous driver on how to operate a vehicle safely and efficiently. with real time analysis and auditory alerts of these factors, I hope to increase a driver's overall awareness to maximize safety.

Checking the level of service quality provided by mobile phone operators

Chamas, H.B., Hussain, Zahid I., Lau, F.W. January 2017 (has links)

Quantifying Human Movement Patterns for Public Health

Wesolowski, Amy 01 May 2014 (has links)
Human travel affects important processes in public health and infectious disease dynamics. Refined spatial and temporal data are needed to accurately model how the dynamics of human travel contribute to epidemiological patterns of disease as well as access to healthcare resources. Here, I address a number of key issues related to modeling human mobility patterns and applications for understanding the spatial spread of infectious diseases and geographic access to public health resources. Using large sources of behavioral data anonymously collected from mobile phones within two African countries, I first analyze the utility of these data to quantify human mobility patterns as well as the usefulness of common modeling frameworks. Then I compare these data to two more common sources of human travel data: the national census and a comprehensive travel survey. Next, I use these data to assess the impact of human travel on the movement of malaria parasites. The final component of my thesis focuses on the utility of this data source to generally understand the role of geographic isolation on travel patterns to better understand the disparity between areas with various levels of access to public resources and the uptake of preventative healthcare such as immunizations and antenatal care.

In vitro effect of 900 MHz GSM radiation on mitochondrial membrane potential and motility of human spermatozoa

Falzone,N, Huyser, C, le Roux Fourie, F, Toivo, T, Leszczynskid, D, Franken, DR January 2008 (has links)
Ejaculated, density purified, human spermatozoa were exposed to 900 MHz GSM mobile phone radiation at two specific absorption rate levels (SAR 2.0 and 5.7 W/kg) and examined at various time points post exposure. Change in sperm mitochondrial membrane potential was analyzed using flow cytometry. Sperm motility was determined by computer assisted sperm analysis (CASA). There was no effect of 900MHz GSM radiation on mitochondrial membrane potential. This was also the case for all kinematic parameters assessed at SAR of 2.0 W/kg. However, two kinematic parameters (VSL and BCF) were statistically significantly altered after the exposure at SAR 5.7 W/kg. Effects seen cannot be ascribed to heating, as the temperature did not increase by more than 0.3ºC. A thorough investigation at lower SAR levels is required to determine the extent of the influence of RF-EMF on human sperm motility.

InVitro effect of pulsed 900MHz GSMradiation on mitochondrial membrane potential and motility of human spermatozoa

Falzone, N, Huyser, NC, Fourie, F, Toivo, T, Leszczynski, D, Franken, D January 2007 (has links)
Abstract Ejaculated, density purified, human spermatozoa were exposed to pulsed 900 MHz GSM mobile phone radiation at two specific absorption rate levels (SAR 2.0 and 5.7 W/kg) and compared with controls over time. Change in sperm mitochondrial membrane potential was analysed using flow cytometry. Sperm motility was determined by computer assisted sperm analysis (CASA). There was no effect of pulsed 900 MHz GSM radiation on mitochondrial membrane potential. This was also the case for all kinematic parameters assessed at a SAR of 2.0 W/kg. However, over time, the two kinematic parameters straight line velocity (VSL) and beat-cross frequency (BCF) were significantly impaired (P<0.05) after the exposure at SAR 5.7 W/kg and no exposure by time interaction was present. This result should not be ascribed to thermal effects, due to the cooling methods employed in the RF chamber and temperature control within the incubator.

An exploratory study of parents’ experiences of their teenagers’ text messaging

Mukasano, Epiphanie January 2014 (has links)
Magister Artium (Child and Family Studies) - MA(CFS) / Today the mobile phone plays a vital role in social life across the globe. For many teenagers and young adults in particular, this device forms an integral part of their daily communication, with text messaging being one of their preferred modes of social interaction. Researchers across the globe have studied various facets of this phenomenon but he main focus has been on this mode of communication in peer relationships. From a family systems perspective, the current qualitative study intended to explore how parents experience their teenagers’ text messaging in terms of communication and relationships with their teenagers, and how parents regulate this pervasive practice. To this end, data were collected by means of one-on-one interviews among eleven parents (eight mothers and three fathers) in Cape Town, South Africa, using a semi-structured interview schedule. With the participants’ permission, the sessions were tape-recorded; data were transcribed, content analysed, and patterns and themes identified according to Creswell’s (2009) steps. Participants expressed a range of experiences, from positive to negative, not only of text messaging, but of their teenagers’ use of mobile phones in general. Among the positives, it was the sense of security the devices gave parents, and the possibility of communicating easily, quickly and at affordable cost and at the same time monitoring their children at a distance. The negatives were mainly related to the misuse/and overuse of the mobile phones. The study suggests that parents were aware of some of the dangers associated with mobile phones, such as bullying, sexting, texting while driving, overuse at the expense of family, studying and sleeping times, and home chores. It also reveals that girls were more at risk, especially when it came to mobile bullying and sexting. Some parents came up with suggestions on dealing with mobile phones and text messaging-related problems. Furthermore, the study is indicative of a predominantly authoritative parenting style whereby parents successfully limited these dangers by regulating the use of their teenagers’ mobile phones. However, for some, finding the balance, especially between parental control and teenagers’ privacy, proved to be a challenge. Moreover, while expressing the need for mobile internet, especially for teenagers’ school work, the majority of participants showed concern about having it under control. The study concludes that text messaging can be used to enhance communication and relationships between parents and their teenagers. It recommends educating the latter about the dangers of mobile phones and the former to monitor their use, while at the same time negotiating teenagers’ freedom.

Essays on telecommunications demand and regulatory policies

Mothobi, Onkokame January 2017 (has links)
This thesis employs models of homogenous and differentiated products to empirically investigate the demand for mobile phone services in Sub-Saharan African countries. The thesis consists of a short introductory chapter, three self-contained empirical chapters, and a summary chapter. In Chapter 2, we use survey data conducted in 2011 in eleven countries in Sub-Saharan African to analyze how the availability of physical infrastructure influences the adoption of mobile phones and usage of mobile services. The availability of physical service infrastructure is approximated by data on night-time light intensity in the areas in which survey respondents reside. After controlling for a number of individual and household characteristics including disposable income, we find that adoption of mobile phones is higher in areas with better physical infrastructure. However, in the group of mobile phone adopters, the use of mobile phones for mobile financial transactions is negatively influenced by the level of infrastructure. Mobile phone users who live in areas with poor infrastructure are more likely to rely on mobile phones to make financial transactions than individuals living in areas with better infrastructure. On the other hand, the use of mobile phones to access services such as email, skype, social media networks and Internet browsing is not dependent on the availability of physical infrastructure. Our results support the notion that mobile phones improve the livelihoods of individuals residing in remote areas by providing them with access to financial services which are otherwise not available physically. Chapter 3 examines the effect of mobile number portability (MNP) on own- and cross-price elasticities. Using quarterly data for 28 mobile operators in seven Sub-Saharan Africa countries between 2010Q4 to 2014Q4 to estimate a differentiated products demand model, we find that MNP increased own-price elasticities of demand in countries that have implemented the facility. This increase in price elasticities may be a result of a reduction in switching costs between operators. On average, the introduction of MNP increases own-price elasticities by 0.47 in absolute value. We compare the level of price elasticities before and after the implementation of MNP in Ghana and Kenya, which implemented this policy in the time period of our study. Our results suggest that in Ghana, MNP increased own-price elasticities by an average of 0.35 in absolute terms from an average value across firms and over time of -0.74. In Kenya, the introduction of MNP increased own-price elasticities by an average of 0.21 in absolute terms from a lower average value across firms and over time of -0.39. However, we find that in Kenya and Ghana the average own-price elasticities remained small even after the implementation of MNP relative to other countries without MNP in place. Thus, our results suggest that MNP is not the ultimate solution for increasing competitiveness within the mobile industry. While in Chapter 3 we use a product differentiated model of demand, in Chapter 4 we make assumptions that allow us to use a homogenous model of demand to examine the effect of regulatory policies on mobile retail prices. Using aggregated quarterly data for eight African countries for the period 2010:Q4 to 2014:Q4, we estimate structural demand and supply equations. We find that mobile termination rates (MTR) have a significant positive impact on mobile retail prices. A decline in average MTR of 10% decreases average mobile retail prices by 2.5%. On the other hand, MNP has an insignificant effect on price and subscriptions in selected African countries. This may be due to inadequate implementation of MNP, which subsequently lead to low demand for porting numbers. The average market conduct in the mobile telecommunications industry for selected African countries can be approximated by Cournot Nash equilibrium. In Chapter 4 we find price elasticities that are closer to 1 in absolute terms. The price elasticity, however, is estimated at an average of -0.27 for Sub-Saharan Africa countries in Chapter 4. We attribute this inconsistency to the different assumptions made in each chapter.

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