There is a growing interest in bringing online and streaming content to the television. Gaming platforms such as the PS3, Xbox 360 and Wii are at the center of this digital convergence; platforms for accessing new media services. This presents a number of interface challenges, as controllers designed for gaming have to be adapted to accessing online content. We conducted a user study examining the limitations and affordances of novel game controllers in an interactive TV (iTV) context and compared them to "second display" approaches using tablets. We looked at task completion times, accuracy and user satisfaction across a number of tasks and found that the Wiimote is most liked and performed best in almost all tasks. Participants found the Kinect difficult to use, which led to slow performance and high error rates. We discuss challenges and opportunities for the future convergence of game consoles and iTV. We also analyzed the usability of the interfaces themselves with respect to each device. Accuracy ratings and context of task type were used to determine ideal component attributes such as button size and spacing. Additional strategies like snapping cursor to buttons in the case of small targets were also suggested. Paying attention to the strengths and weaknesses of each input method, we put forth a set of design recommendations for future iTV interfaces that leverage novel input devices. / Graduation date: 2012

No description available.

The demand for high-performance and power scalable DSP processors for telecommunication and portable devices has increased significantly in recent years. The Fast Fourier Transform (FFT) computation is essential to such designs. This work presents a switch-based architecture to design radix-2 FFT processors. The processor employs M processing elements, 2M memory arrays and M Read Only Memories (ROMs). One processing element performs one radix-2 butterfly operation. The memory arrays are designed as single-port memory, where each has a size of N/(2M); N is the number of FFT points. Compared with a single processing element, this approach provides a speedup of M. If not addressed, memory collisions degrade the processor performance. A novel algorithm to detect and resolve the collisions is presented. When a collision is detected, a memory management operation is executed. The performance of the switch architecture can be further enhanced by pipelining the design, where each pipeline stage employs a switch component. The result is a speedup of Mlog2N compared with a single processing element performance. The utilization of single-port memory reduces the design complexities and area. Furthermore, memory arrays significantly reduce power compared with the delay elements used in some FFT processors. The switch-based architecture facilitates deactivating processing elements for power scalability. It also facilitates implementing different FFT sizes. The VLSI implementation of a non-pipeline switch-based processor is presented. Matlab simulations are conducted to analyze the performance. The timing, power and area results from RTL, synthesis and layout simulations are discussed and compared with other processors. / text

Modern implantable and body worn medical devices leverage wireless telemetry to improve patient experience and expand therapeutic options. Wireless medical devices are subject to a unique set of regulations in which monitoring of the available frequency spectrum is a requirement. To this end, implants use software protocols to assess the in-band activity to determine which channel should be used. These software protocols take valuable processing time and possibly degrade the operational lifetime of the battery. Implantable medical devices often take advantage of a single chip transceiver as the physical layer for wireless communications. Embedding the channel assessment task in the transceiver hardware would free the limited resources of the microprocessor. This thesis proposes hardware modifications to existing transceiver architectures which would provide an automated channel assessment means for implantable medical devices. The results are applicable beyond medical device applications and could be employed to benefit any low-power, wireless, battery-operated equipment.

Objective : Low back pain (LBP), and in particular sacroiliac joint syndrome, is a significant health concern for both patient and their chiropractor with regards to quality of life and work related musculoskeletal disorders. Therefore, chiropractors often utilise mechanical aids to reduce the impact on the chiropractor’s health. It is, however, important to establish whether these mechanical aids are indeed clinically effective, therefore, this study evaluated the Activator Adjusting Instrument (AAI) against an AAI placebo to determine whether this adjusting instrument is an effective aid for both the chiropractor and the patient. Method : This randomised, placebo controlled clinical trial consisted of 40 patients (20 per group), screened by stringent inclusion criteria assessed through a telephonic and clinical assessment screen. Post receipt of informed consent from the patients, measurements (NRS, Revised Oswestry Disability Questionnaire, algometer) were taken at baseline, prior to consultation three and at the follow consultation. This procedure occurred with four interventions over a two week period. Results: The AAI group showed clinical significance for all clinical measures as compared to the AAI placebo group which attained clinical significance only for the Revised Oswestry Disability Questionnaire. By comparison there was only a statistically significant difference between the groups in terms of the algometer readings (p= 0.037). Conclusion : Therefore, it is evident that the AAI seems to have clinical benefit beyond a placebo. However this is not reflected in the statistical analysis. It is, therefore, suggested that this study be repeated with a larger sample size in order to verify the effect on the statistical analysis outcomes.

Submitted in partial fulfillment of the requirement for the Masters Degree in Technology (Marketing), Marketing, Retail and Public Relations Department, Durban University of Technology, 2009. / Interest in the quality of the health and fitness industry has grown considerably over the last decade. Gymnasiums are increasingly placing greater emphasis on meeting members‟ expectations and needs. As more competition enters this industry, members‟ perceptions of gymnasiums facilities and services are becoming more important. It is apparent that there is a need to measure members‟ expectations and perceptions of service quality at Virgin Active gymnasiums in the greater Durban area. The aim of this study was to investigate customer service quality at commercial health and fitness centres. The four objectives of this study were: firstly, to identify members‟ expectations in terms of the delivered services provided at Virgin Active gymnasiums; secondly, to ascertain the perceptions of members towards the services provided at Virgin Active gymnasiums; thirdly, to measure the gaps between members‟ expectations and perceptions of service quality, using a modified version of the SERVQUAL model, and fourthly, to calculate and measure the score of the SERVQUAL dimensions. The instrument used to assess the members‟ expectations and perceptions of service quality was the SERVQUAL questionnaire, measuring expectations and perceptions according to five quality dimensions. Four hundred and fifty members were surveyed using the SERVQUAL questionnaire. The respondents were selected through non-probability sampling within which convenience sampling was applied. Data were analyzed using descriptive and inferential statistical techniques. Conclusions and recommendations were thereafter drawn from the literature and the findings of the study. The study shows that members‟ expectations of service quality exceeded their perceptions on the five service quality dimensions used in the SERVQUAL questionnaire. The smallest dimension gap score proved to be tangibles, while the largest gap score of the study proved to be empathy followed by responsiveness. iv Therefore, it is recommended that Virgin Active gymnasiums in the greater Durban area attend to these gaps and ensure that necessary strategies are implemented so that members receive a high level of service quality in all areas of the service dimensions.

Thesis (MSc) -- Stellenbosch University, 2003. / ENGLISH ABSTRACT: Software testing tools simplify and automate the menial work associated with testing. Moreover, for complex concurrent software such as computer protocols, testing tools allow testing on an abstract level that is independent of specific implementations. Standard conformance testing methodologies and a number of testing tools are commercially available, but detailed descriptions of the implementation of such testing tools are not widely available. This thesis investigates the development of a tool for automated protocol testing in the ETH Oberon development environment. The need to develop a protocol testing tool that automates the execution of specified test cases was identified in collaboration with a local company that develops protocols in the programming language Oberon. Oberon is a strongly typed secure language that supports modularisation and promotes a readable programming style. The required tool should translate specified test cases into executable test code supported by a runtime environment. A test case consists of a sequence of input actions to which the software under test is expected to respond by executing observable output actions. A number of issues are considered of which the first is concerned with the representation of test case specifications. For this, a notation was used that is basically a subset of the test specification language TTCN-3 as standardised by the European Telecommunications Standards Institute. The second issue is the format of executable test cases and a suitable runtime environment. A translator was developed that generates executable Oberon code from specified test cases. The compiled test code is supported by a runtime library, which is part of the tool. Due to the concurrent nature of a protocol environment, concurrent processes in the runtime environment are identified. Since ETH Oberon supports multitasking in a limited sense, test cases are executed as cooperating background tasks. The third issue is concerned with the interaction between an executing test case and a system under test. It is addressed by an implementation dependent interface that maps specified test interactions onto real interactions as required by the test context in which an implementation under test operates. A supporting protocol to access the service boundary of an implementation under test remotely and underlying protocol service providers are part of a test context. The ETH Oberon system provides a platform that simplifies the implementation of protocol test systems, due to its size and simple task mechanism. Operating system functionality considered as essential is pointed out in general terms since other systems could be used to support such testing tools. In conclusion, directions for future work are proposed. / AFRIKAANSE OPSOMMING: Toetsstelsels vir programmatuur vereenvoudig en outomatiseer die slaafse werk wat met toetsing assosieer word. 'n Toetsstelsel laat verder toe dat komplekse gelyklopende programmatuur, soos rekenaarprotokolle, op 'n abstrakte vlak getoets word, wat onafhanklik van spesifieke implementasies is. Daar bestaan standaard metodes vir konformeringstoetsing en 'n aantal toetsstelsels is kommersiëel beskikbaar. Uitvoerige beskrywings van die implementering van sulke stelsels is egter nie algemeen beskikbaar nie. Hierdie tesis ondersoek die ontwikkeling van 'n stelsel vir outomatiese toetsing van protokolle in die ontwikkelingsomgewing van ETH Oberon. Die behoefte om 'n protokoltoetsstelsel te ontwikkel, wat die uitvoering van gespesifiseerde toetsgevalle outomatiseer, is geïdentifiseer in oorleg met 'n plaaslike maatskappy wat protokolle ontwikkel in die Oberon programmeertaal. Oberon is 'n sterkgetipeerde taal wat modularisering ondersteun en a leesbare programmeerstyl bevorder. Die toestsstelsel moet gespesifiseerde toetsgevalle vertaal na uitvoerbare toetskode wat ondersteun word deur 'n looptydomgewing. 'n Toetsgeval bestaan uit 'n reeks van toevoeraksies waarop verwag word dat die programmatuur wat getoets word, sal reageer deur die uitvoering van afvoeraksies wat waargeneem kan word. 'n Aantal kwessies word aangeraak, waarvan die eerste te make het met die voorstelling van die spesifikasie van toetsgevalle. Hiervoor is 'n notasie gebruik wat in wese 'n subversameling van die toetsspesifikasietaal TTCN-3 is. TTCN-3 is gestandardiseer deur die European Telecommunications Standards Institute. Die tweede kwessie is die formaat van uitvoerbare toetsgevalle en 'n geskikte looptydomgewing. 'n Vertaler is ontwikkel wat uitvoerbare Oberon-kode genereer vanaf gespesifiseerde toetsgevalle. Die vertaalde toetskode word ondersteun deur 'n biblioteek van looptydfunksies, wat deel van die stelsel is. As gevolg van die eienskap dat 'n protokolomgewing uit gelyklopende prosesse bestaan, word daar verskillende tipes van gelyklopende prosesse in 'n protokoltoetsstelsel geïdentifiseer. Aangesien ETH Oberon 'n beperkte multitaakstelsel is, word toetsgevalle vertaal na eindige outomate wat uitgevoer word as samewerkende agtergrondtake. Die derde kwessie het te make met die interaksie tussen 'n toetsgeval wat uitgevoer word en die stelsel wat getoets word. Dit word aangespreek deur 'n koppelvlak wat gespesifiseerde interaksies afbeeld op werklike interaksies soos vereis deur die konteks waarin 'n implementasie onderworpe aan toetsing uitvoer. 'n Ondersteunende protokolom die dienskoppelvlak van die implementasie oor 'n afstand te bereik en ander onderliggende protokoldienste is deel van 'n toetskonteks. Die ETH Oberon-stelsel help in die vereenvoudiging van die implementasie van protokol toetsstelsels, as gevolg van die stelsel se grootte en die eenvoudige taakhanteerder . Die essensiële funksionaliteit van bedryfsstelsels word uitgelig in algemene terme omdat ander stelsels gebruik kan word om toetsstelsels te ondersteun. Ten slotte word voorstelle vir opvolgwerk gemaak.

Radio frequency identification (RFID) technology is a useful technology that has myriad applications in technology, retail, manufacturing, and healthcare settings. Not dependent upon line-of-sight, RFID can scan devices in their proximity and report the information to connected (wired or other wireless) information systems. Once touted as the panacea for home healthcare, RFID devices can add benefit to patients in remote settings. RFID devices have been used to optimize systems in areas such as manufacturing and healthcare to expose inefficiencies in a system or process. Unlike manufacturing, however, RFID in healthcare settings presents security and privacy concerns to the people being tracked by the devices – particularly healthcare workers including nurses and doctors. This research presented a theoretical model that assessed the effect of five independent variables, namely, cognitive factors, of privacy concerns regarding surveillance and RFID devices and trust in the electronic medium, subjective norm, existence of security policy, and persistence of data on a dependent variable - intention to use RFID. The theoretical model presented in this research is based on the technology acceptance model and the extended theory of planned behavior. The research showed significant relationships between the cognitive factors of privacy concerns regarding surveillance and RFID devices, and trust and the electronic medium and perception of external control on intention to use. The theoretical model used in this research can be refined to better understand intention to use RFID in hospital environments.

Thesis (MBA)--Stellenbosch University, 2014. / ENGLISH ABSTRACT: Mobile lifter (ML) is a product that is used to lift loads or materials ranging from 20–600 kilograms (kg), and to move the loads to anywhere within the factory up to a height of 2.3 metres (m). The ML is ideal for loads heavier than human comfort, dangerous to touch by hands, requiring repetitive moving and not heavy enough for a forklift. As the need for labour rises and manufactures want to increase productivity, the ML becomes the solution. Currently, there is no company that specialises in ML, and that provides good service to the customers. HELM intends filling that gap in the markets. HELM plans to acquire exclusive distribution rights with a European base supplier of MLs. HELM will become the distributor of MLs in Southern Africa. HELM will have its base or office in Cape Town (CT), but also secure subcontractors in three other provinces, namely Gauteng, KwaZulu- Natal (KZN), and the Eastern Cape (EC). HELM will sell products from its supplier partner and it will offer services and a maintenance plan to its clients at a competitive rate. The ML can be used in manufacturing, wholesale, the retail trade and motor trade, and transport and storage. The three sectors account for over 35 percent of South Africa’s gross domestic product. The manufacturing sector is the largest sector with many industries. The most attractive industries are the fast moving consumer goods, automotive, pharmaceutical and chemical manufacturing industries. Although the industry or market is fragmented, Gauteng has the largest target market with over 9000 registered manufacturing enterprise. It is followed by KwaZulu-Natal, then the Western Cape and finally the Eastern Cape. The ML industry is still in its infancy, and HELM Solutions intend to sell 25 units in the first year, 33 in the second and then 36 in the third year. The current distributors of MLs only have one point of service per distributor in South Africa and MLs are non-core products for them. HELM also intends differentiating itself from other distributors by being a solution provider to clients, and not a product distributor. HELM wants to understand the clients’ business, understand their needs, and provide them with solution that will also increase their profit. This should give HELM a competitive advantage and make it difficult for clients to substitute the HELM products and service. Franck Tshilombo is one of the three entrepreneurs who will be directly involved in the business. He will start as the only employee of the business. He has been working with MLs for the past four years. His experience ranges from selling and marketing to ordering, assembling, service and maintenance of MLs. Kevin French brings experience in the financial field of investments. He holds a B Com degree and is a CFA charter holder. He has 25 years combined experience in financial services at large corporates and smaller entrepreneurial start-ups. He owns an investment management business and two paint distribution businesses. His experience includes starting new businesses, takeovers and turnarounds in financial services, and construction and electrical engineering. Collin Ramukhubathi who has a mechanical engineering degree and is an MBA candidate, has 15 years working experience in general management in construction and the mining sector. HELM Solutions require funding for fixed assets and working capital. The fixed asset will be funded by shareholders in the form of assets worth R30 000 and cash of R15 000. The amount of external funding required is R154 000. The desired funding should be in the form of an overdraft loan, as not all the funds will be needed in the beginning. This funding will be used towards the monthly expenses for the period of three months and towards increases in sales within the first five months. The funds will be needed during sales growth as the cash conversion cycle of the business is long. The overdraft loan is based on the interest rate of 12 percent. Based on these estimates, the loan will be fully repaid within 11 months.

The bycatch of cetaceans in fishing gear is considered to be one of the biggest conservation threats to these species. Gear modifications have the potential to reduce these bycatches in global fisheries but there is little available information on how such modifications may change the fishing performance of gear, or indeed the behavior of cetaceans interacting with fishing gear. Generalized linear models (GLMs) were used to identify factors related to cetacean bycatches in UK bottom set gillnets. Rigged net height had a significant positive relationship with harbour porpoise (Phocoena phocoena) bycatch in ICES Area VII suggesting that lowering the profile of gillnets may have the potential to reduce bycatch rates. Modifications to gillnets, such as changing the amount of floatation or increasing the density of the meshes, were found to have significant effects on the active fishing heights of these nets. However, results from a bycatch mitigation trial in Argentina showed that the reduced fishing profile of one experimental net did not result in a concurrent reduction in the bycatch rate of Franciscana dolphins (Pontoporia blainvillei). While there was no significant difference in the rate, length or intensity of harbour porpoise encounters in the presence or absence of gillnets, the proportion of fast echolocation click trains were significantly higher when a net was present, indicating that porpoises either increased acoustic inspection of the net or foraging in the vicinity of the net. An analysis of underwater video footage collected inside trawl nets in an Australia fishery showed that bottlenose dolphins (Tursiops sp.) were present inside nets more frequently than they were caught and were actively foraging inside these nets. The orientation of dolphins inside these nets indicates that the current design of excluder devices used in this fishery could be improved to further reduce bycatch rates.