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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.
1

An efficient communication interface and protocol for motor protection relays

Mouton, A.J.J., Smith, C.J., Smith, G.E.; January 2009 (has links)
Published Article / A company in South Africa is a three-phase induction motor protection relay manufacturer. The function of the protection relay is to capture running data, to provide protection against possible damage, to control an electric motor and to communicate this data to the System Control and Data Acquisition (SCADA) system in a control room. In the case of remote sites e.g. a pump station, the protection relays are used as standalone units. The protection relays are equipped with communication facilities to be used in an instrumentation environment. If a trip occurs or settings need to be changed a technician has to visit the remote site and address the problem. The ideal cost and time effective solution is to perform these tasks remotely via a reliable wireless network. A study was conducted to ascertain the viability of using the standard GSM cellular networks in South Africa to effectively control electric motors and to communicate with the Motor Protection Relays (MPRs) controlling the electric motors in order to determine the status of a motor, settings of the motor, trips that occurred and time of occurrence. It was shown that a node controller could be used to store all the data from various electric motors at a single location. It was also shown that the data from the different electric motors could be analysed at the node controller and that communication can then be initiated from the controller to a responsible person via the GSM network. It was further illustrated that, by making use of the GSM networks in South Africa together with the short message service (SMS), communication and control can be effectively established. SMSs proved to be a reliable means of communication between cellular phones, an embedded network and MPRs. It was shown that software protocols, although slower in communication speed, proved to be reliable and effective for the purpose of transferring information between the node controller and the motor protection relays connected to the electric motors.
2

Inexpensive mobile technologies to empower rural farmers with m-agriculture

Iraba, Marie Louise January 2010 (has links)
<p>Market information and established communication between seller and buyer play an important role in business activities. This thesis investigates the Transkei area in the Eastern Cape&nbsp / Province, South Africa to find out how to empower rural farmers by providing them with less-expensive mobile technology enabling them to post and advertise their produce, access market&nbsp / information on a common database, and find and communicate with potential customers. The farmers&rsquo / requirements were identified using quantitative and qualitative methods and a prototype&nbsp / consisting of USSD and web applications was developed. It allows the farmer to follow a sequence of menu commands to send a request to the database and access market information, such&nbsp / as commodity prices, and post information about their own produce so as to attract more customers. The low cost of USSD and the ubiquity of mobile phones enable the system to be usable, affordable and effective. During the final stage of development, the system was tested successfully and addressed a major problem faced by farmers, i.e. lack of access to market information.</p>
3

Inexpensive mobile technologies to empower rural farmers with m-agriculture

Iraba, Marie Louise January 2010 (has links)
<p>Market information and established communication between seller and buyer play an important role in business activities. This thesis investigates the Transkei area in the Eastern Cape&nbsp / Province, South Africa to find out how to empower rural farmers by providing them with less-expensive mobile technology enabling them to post and advertise their produce, access market&nbsp / information on a common database, and find and communicate with potential customers. The farmers&rsquo / requirements were identified using quantitative and qualitative methods and a prototype&nbsp / consisting of USSD and web applications was developed. It allows the farmer to follow a sequence of menu commands to send a request to the database and access market information, such&nbsp / as commodity prices, and post information about their own produce so as to attract more customers. The low cost of USSD and the ubiquity of mobile phones enable the system to be usable, affordable and effective. During the final stage of development, the system was tested successfully and addressed a major problem faced by farmers, i.e. lack of access to market information.</p>
4

Understanding the 'mess' in text messages : An analysis of humorous text message exchanges shared in social media platforms / Att förstå röran i textmeddelanden : En analys av humoristiska SMS-dialoger som delats i sociala medier

Andersson, Anna January 2016 (has links)
The concept 'mess-understanding' has circulated in online media and is so prevalent that it is now included in the Urban Dictionary. The folk concept of mess-understandings is a pun for misunderstandings arising in an online media context. Posting one's own or others' miscommunication and/or typographical errors has grown to be a popular way of sharing humor via cross-platform sharing on the Internet. The aim of this paper is to analyze short message service (SMS) dialogues shared in social media, with a special emphasis on those with the highest degree of 'shareability' and/or popularity. The study specifically focuses on understanding linguistic and communicative reasons behind these dialogues being treated as humorous by users. As such, the study aims to shed light upon current cultural conceptions of communication and humor. Data was collected from the photo sharing website Pinterest from users who had posted or reposted 'screen shots' from their own or others' SMS conversations. In order to collect as much valuable data as possible, a manual search strategy was developed with three different word strings which resulted in a corpus of 160 dialogues. Content analysis of the data revealed certain recurrent humor themes, such as allusions to sexual conduct or bodily functions, generation gaps, technology difficulties, and lexical ambiguity. / Begreppet ‘mess-förstånd’ har på senare tid cirkulerat på Internet och är nu så allmänt förekommande att det är inkluderat i Urban Dictionary. Mess-förstånd är en ordvits för missförstånd som förekommer på Internet. Att lägga upp sina egna eller andras misslyckade konversationer och/eller typografiska fel har utvecklats till ett populärt sätt att dela humor via olika plattformar på Internet. Syftet med den här uppsatsen är att analysera vilka lingvistiska mönster av SMS-missförstånd som finns, med speciell betoning på sådana som har den högsta graden av ‘delbarhet’ och/eller popularitet och vad det säger oss om rådande föreställningar om kommunikation och humor. Det empiriska materialet insamlades från fotodelningshemsidan Pinterest från användare som hade lagt upp eller återbrukat ‘skärmavbilder’ från sina egna eller andras SMS-konversationer. För att samla in så mycket värdefull data som möjligt användes en manuell sökstrategi med tre olika ordsträngar som resulterade i en korpus med 160 dialoger. Analyser av dialogerna visade på återkommande humorteman, exempelvis anspelningar på sexualitet eller kroppsliga funktioner, generationsklyftor, teknologiska svårigheter och lexikala tvetydligheter.
5

Inexpensive mobile technologies to empower rural farmers with m-agriculture

Iraba, Marie Louise January 2010 (has links)
Magister Scientiae - MSc / Market information and established communication between seller and buyer play an important role in business activities. This thesis investigates the Transkei area in the Eastern Cape Province, South Africa to find out how to empower rural farmers by providing them with less-expensive mobile technology enabling them to post and advertise their produce, access market information on a common database, and find and communicate with potential customers. The farmers’ requirements were identified using quantitative and qualitative methods and a prototype consisting of USSD and web applications was developed. It allows the farmer to follow a sequence of menu commands to send a request to the database and access market information, such as commodity prices, and post information about their own produce so as to attract more customers. The low cost of USSD and the ubiquity of mobile phones enable the system to be usable, affordable and effective. During the final stage of development, the system was tested successfully and addressed a major problem faced by farmers, i.e. lack of access to market information. / South Africa
6

Short message service normalization for communication with a health information system

Adesina, Ademola Olusola January 2011 (has links)
Philosophiae Doctor - PhD / Short Message Service (SMS) is one of the most popularly used services for communication between mobile phone users. In recent times it has also been proposed as a means for information access. However, there are several challenges to be overcome in order to process an SMS, especially when it is used as a query in an information retrieval system.SMS users often tend deliberately to use compacted and grammatically incorrect writing that makes the message difficult to process with conventional information retrieval systems. To overcome this, a pre-processing step known as normalization is required. In this thesis an investigation of SMS normalization algorithms is carried out. To this end,studies have been conducted into the design of algorithms for translating and normalizing SMS text. Character-based, unsupervised and rule-based techniques are presented. An investigation was also undertaken into the design and development of a system for information access via SMS. A specific system was designed to access information related to a Frequently Asked Questions (FAQ) database in healthcare, using a case study. This study secures SMS communication, especially for healthcare information systems. The proposed technique is to encipher the messages using the secure shell (SSH) protocol.
7

The influence of mobile internet on advertising to consumers in the short–term insurance industry / by Shandukani A. Davhana

Davhana, Shandukani Albert January 2009 (has links)
Marketing and advertisement activities are transforming as new digital media streams emerge. It is believed that the first major digital transition took place when broadcast media such as television and cinema, also called first screen, to the PC Internet, referred to as the second screen, entered the media industry. The last couple of years saw an expanding transition into the third screen, which is the mobile handset, commonly known as cellphones in South Africa. The rapid explosion of mobile phones and other mobile devices has created a new marketing channel. The use of Short Messaging Service, Multimedia Message Service, Graphic WAP Banners, and Video Clips to communicate with customers through their mobile devices / cellphones has gained popularity, making the mobile phone the ultimate medium for one–to–one or one–to–many marketing. And the more mobile handsets penetrate the mass market, the greater are the opportunities for advertising experiences. This exploratory study investigates the impact / effectiveness of mobile advertising to consumers in the short–term insurance industry. The study briefly focuses on whether marketers are reaping the benefits of using this medium to communicate and market their products and services to the identified target market. The findings indicate that mobile advertising has an impact on consumers in the short–term insurance industry. It was also envisaged that where mobile advertising seems to have no effect, the root of the problem lies in the mass marketing approach. Customers are looking for full customisation of mobile marketing messages, based on their individual requirements, tastes, preferences, location, time, and it should also add value to consumers. For maximum impact, it is also recommended that marketers should build measurements, targeting and optimisation into their campaign processes. / Thesis (M.B.A.)--North-West University, Potchefstroom Campus, 2011.
8

The influence of mobile internet on advertising to consumers in the short–term insurance industry / by Shandukani A. Davhana

Davhana, Shandukani Albert January 2009 (has links)
Marketing and advertisement activities are transforming as new digital media streams emerge. It is believed that the first major digital transition took place when broadcast media such as television and cinema, also called first screen, to the PC Internet, referred to as the second screen, entered the media industry. The last couple of years saw an expanding transition into the third screen, which is the mobile handset, commonly known as cellphones in South Africa. The rapid explosion of mobile phones and other mobile devices has created a new marketing channel. The use of Short Messaging Service, Multimedia Message Service, Graphic WAP Banners, and Video Clips to communicate with customers through their mobile devices / cellphones has gained popularity, making the mobile phone the ultimate medium for one–to–one or one–to–many marketing. And the more mobile handsets penetrate the mass market, the greater are the opportunities for advertising experiences. This exploratory study investigates the impact / effectiveness of mobile advertising to consumers in the short–term insurance industry. The study briefly focuses on whether marketers are reaping the benefits of using this medium to communicate and market their products and services to the identified target market. The findings indicate that mobile advertising has an impact on consumers in the short–term insurance industry. It was also envisaged that where mobile advertising seems to have no effect, the root of the problem lies in the mass marketing approach. Customers are looking for full customisation of mobile marketing messages, based on their individual requirements, tastes, preferences, location, time, and it should also add value to consumers. For maximum impact, it is also recommended that marketers should build measurements, targeting and optimisation into their campaign processes. / Thesis (M.B.A.)--North-West University, Potchefstroom Campus, 2011.

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