Thesis (M Sport Sc (Sport Science))--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: The purpose of the study was to analyse the penalty area entrances of a team competing in the Premier Soccer League (PSL) in South Africa. Ten home matches of the team were analysed making use of a category set designed for the study. The main areas of analysis included the point of final action before the ball entered the penalty area, the part of the penalty area at which the entrance occurred, the method of entrance, the number of completed passes within the area, and the outcome of the entrance as well as the reason for the outcome. The results revealed that the team entered the penalty area on average 59.4 times per match and scored a goal on every 37.4 penalty area entrances. The ball being taken away by the opponents was the outcome that occurred most frequently within the penalty area (42.1% of all entries), and was largely due to interceptions by the defending team (20.7%). The next most commonly occurring event was the ball being given away by the attacking team (22.4% of all entries) and was largely as a result of the poor passing (20%). The results revealed that in order for the team to improve their ability to convert their attacking opportunities into goals, improvement of technical execution in particular passing and shooting within the critical areas of the field must be established. The results have implications for the use of performance analysis for professional teams as support for the coaching process. / AFRIKAANSE OPSOMMING: Die doel van die studie was om „n prestasie-profiel te ontwikkel wat die strafarea-toegang beskryf van „n professionele span wat aan die Premier Sokker Liga (PSL) in Suid-Afrika deelneem. Tien tuiswedstryde van die span is geanaliseer, gebaseer op „n kategorie wat vir die studie ontwerp is. Die vlakke van analise was eerstens die punt van finale aksie voordat die bal die strafarea binnegaan, die plek in die strafarea waar toegang plaasgevind het, die metode van toegang, die hoeveelheid afgehandelde aangee-aksies in die area en laastens die uitkoms van die toegang asook die rede vir die uitkoms. Die resultate het aangedui dat die span die strafarea ongeveer 59.4 keer per wedstryd betree en elke 37.4 „n doel aanteken deur toegang tot die strafarea te verkry. Die afneem van die bal deur „n span (42.1% van toegang) het die meeste plaasgevind nadat die bal die strafarea binne gegaan het. Dit is grotendeels te wyte aan onderskepping deur die verdedigende span (20.7%). Die weggee van die bal deur die aanvallende span (22.4% van toegang) was hoofsaaklik as gevolg van swak aangee-aksies (20%) en het ook dikwels voorgekom. Die prestasie-profiel het aangedui dat indien die span hulle vermoë wil verbeter om aanvallende geleenthede te laat eindig in „n doel, verbetering nodig is met tegniese uitvoering, veral met vaardighede ten opsigte van „n bal-aangee en doelskop. Hierdie studie is „n voorbeeld van hoe prestasie-analise aangewend kan word in professionele sokker om ondersteuning aan die afrigtingsproses te bied.

Recent scholarly writing has located performance analysis firmly within the coaching process. Although the what of performance analysis regarding system design and reliability has been well documented, the how and the why or use of video-based performance analysis within the coaching process remains less understood. Therefore, this thesis sought to develop an empirically-based understanding of some of the realities of the use of video based performance analysis feedback within the coaching process. Within a broad ethnographic framework, this thesis followed three key phases of data collection and analysis. Within phase one, a grounded theory methodology, was used to explore the what and why of the delivery of video-based performance analysis in elite youth soccer. Data were collected from interviews with 14 England youth soccer coaches. Through an iterative process of constant comparison, categories regarding Contextual Factors, Delivery Approach and Targeted Outcomes were highlighted. Within phase two, coach-athletes interactions were examined in situ over the course of a 10-month English Premier League Academy season to explore the how of the delivery of video-based feedback. Data were analysed using the techniques and procedures of conversation analysis combined with a social power analysis drawing upon the work of Bertram H. Raven. Analysis of the interactions revealed that the coach attempted to exercise control over the sequential organisation of the session, via asymmetrical turn-taking allocations, an unequal opportunity to talk, control over the topic of discussion within the interactions, and the use of questioning to select speakers to take turns to talk. Within phase three, a narrative ethnographic approach was utilised to examine the how and why of the in situ narrative construction of professional knowledge and coaching identity within video-based feedback sessions. Data were collected during the same 10 months of ethnographic filed work, as presented in phase two, with a Premier League Academy Head Coach. Additionally, in-depth interviews stimulated by video-based reflection were used to explore the participant coach s early interactional practices and subsequent changes in practice in the following four years. Data analysis was conducted using theoretical concepts of identity from the work of Anselm Strauss and revealed a number of features of the development and transformation of identity of the participant coach. Here, a reflective examination of authoritarian interactional practices and the consequences of those practices were critically considered against the creation of a positive self narrative in the development of the participant coach s professional knowledge. The empirical findings of the present thesis have highlighted some the what, why and how of the use of video-based performance analysis within the coaching process. This work has furthered understanding regarding the pedagogical practices which impact upon the delivery of video-based performance analysis feedback. In addition to broadening sports coaching s theoretical and methodological repertoire, the applied value of this work is grounded in the need for coaching practitioners to become more critically reflective about the use of video-based performance analysis within the coaching process, and the impact of their interactional practices upon the coach-athlete relationship.

Sensor nodes are deployed over sensing fields for the purpose of monitoring certain phenomena of interest. The sensor nodes perform specific measurements, process the sensed data, and send the data to a base station over a wireless channel. The base station collects data from the sensor nodes, analyses this data, and reports it to the users. Wireless sensor networks are different from traditional networks, because of the following constraints. Typically, a large number of sensor nodes need to be randomly deployed and, in most cases, they are deployed in unreachable environments; however, the sensor nodes may fail, and they are subject to power constraints. Energy is one of the most important design constraints of wireless sensor networks. Energy consumption, in a sensor node, occurs due to many factors, such as: sensing the environment, transmitting and receiving data, processing data, and communication overheads. Since the sensor nodes behave as router nodes for data propagation, of the other sensor nodes to the base station, network connectivity decreases gradually. This may result in disconnected sub networks of sensor nodes. In order to prolong the network's lifetime, energy efficient protocols should be designed for the characteristics of the wireless sensor network. Sensor nodes in different regions of the sensing field can collaborate to aggregate the data that they gathered. Data aggregation is defined as the process of aggregating the data from sensor nodes to reduce redundant transmissions. It reduces a large amount of the data traffic on the network, it requires less energy, and it avoids information overheads by not sending all of the unprocessed data throughout the sensor network. Grouping sensor nodes into clusters is useful because it reduces the energy consumption. The clustering technique can be used to perform data aggregation. The clustering procedure involves the selection of cluster heads in each of the cluster, in order to coordinate the member nodes. The cluster head is responsible for: gathering the sensed data from its cluster's nodes, aggregating the data, and then sending the aggregated data to the base station. An adaptive clustering protocol was introduced to select the heads in the wireless sensor network. The proposed clustering protocol will dynamically change the cluster heads to obtain the best possible performance, based on the remaining energy level of sensor nodes and the average energy of clusters. The OMNET simulator will be used to present the design and implementation of the adaptive clustering protocol and then to evaluate it. This research has conducted extensive simulation experiments, in order to fully study and analyse the proposed energy efficient clustering protocol. It is necessary for all of the sensor nodes to remain alive for as long as possible, since network quality decreases as soon as a set of sensor nodes die. The goal of the energy efficient clustering protocol is to increase the lifetime and stability period of the sensor network. This research also introduces a new bidirectional data gathering protocol. This protocol aims to form a bidirectional ring structure among the sensor nodes, within the cluster, in order to reduce the overall energy consumption and enhance the network's lifetime. A bidirectional data gathering protocol uses a source node to transmit data to the base station, via one or more multiple intermediate cluster heads. It sends data through energy efficient paths to ensure the total energy, needed to route the data, is kept to a minimum. Performance results reveal that the proposed protocol is better in terms of: its network lifetime, energy dissipation, and communication overheads.

Analytical modelling and characterization of Weighted Fair Queueing (WFQ) have recently received considerable attention by several researches since WFQ offers the minimum delay and optimal fairness guarantee. However, all previous work on WFQ has focused on developing approximations of the scheduler with an infinite buffer because of supposed scalability problems in the WFQ computation. The main aims of this thesis are to study WFQ system, by providing an analytical WFQ model which is a theoretical construct based on a form of processor sharing for finite capacity. Furthermore, the solutions for classes with Poisson arrivals and exponential service are derived and verified against global balance solution. This thesis shows that the analytical models proposed can give very good results under particular conditions which are very close to WFQ algorithms, where accuracy of the models is verified by simulations of WFQ model. Simulations were performed with QNAP-2 simulator. In addition, the thesis presents several performance studies signifying the power of the proposed analytical model in providing an accurate delay bounds to a large number of classes. These results are not able to cover all unsolved issues in the WFQ system. They represent a starting point for the research activities that the Author will conduct in the future. The author believes that the most promising research activities exist in the scheduler method to provide statistical guarantees to multi-class services. The author is convinced that alternative software, for example, on the three class model buffer case, is able to satisfy the large number of buffer because of the software limitation in this thesis. While they can be a good topic for long-term research, the short-medium term will show an increasing interest in the modification of the WFQ models to provide differentiated services.

Mobile Ad hoc Networks (MANETs) are of great interest to researchers and have become very popular in the last few years. One of the great challenges is to provide a routing protocol that is capable of offering the shortest and most reliable path in a MANET in which users are moving continuously and have no base station to be used as a reference for their position. This thesis proposes some new routing protocols based on the angles (directions) of the adjacent mobile nodes and also the node density. In choosing the next node in forming a route, the neighbour node with the closest heading angle to that of the node of interest is selected, so the connection between the source and the destination consists of a series of nodes that are moving in approximately the same direction. The rationale behind this concept is to maintain the connection between the nodes as long as possible. This is in contrast to the well known hop count method, which does not consider the connection lifetime. We propose three enhancements and modifications of the Ad-hoc on demand distance vector (AODV) protocol that can find a suitable path between source and destination using combinations and prioritization of angle direction and hop count. Firstly, we consider that if there are multiple routing paths available, the path with the minimum hop count is selected and when the hop counts are the same the path with the best angle direction is selected. Secondly, if multiple routing paths are available the paths with the best angle direction are chosen but if the angles are the same (fall within the same specified segment), the path with minimum hop count is chosen. Thirdly, if there is more than one path available, we calculate the average of all the heading angles in every path and find the best one (lowest average) from the source to the destination. In MANETs, flooding is a popular message broadcasting technique so we also propose a new scheme for MANETS where the value of the rebroadcast packets for every host node is dynamically adjusted according to the number of its neighbouring nodes. A fixed probabilistic scheme algorithm that can dynamically adjust the rebroadcasting probability at a given node according to its ID is also proposed; Fixed probabilistic schemes are one of the solutions to reduce rebroadcasts and so alleviate the broadcast storm problem. Performance evaluation of the proposed schemes is conducted using the Global Mobile Information System (GloMoSim) network simulator and varying a number of important MANET parameters, including node speed, node density, number of nodes and number of packets, all using a Random Waypoint (RWP) mobility model. Finally, we measure and compare the performance of all the proposed approaches by evaluating them against the standard AODV routing protocol. The simulation results reveal that the proposed approaches give relatively comparable overall performance but which is better than AODV for almost all performance measures and scenarios examined.

Many small islands depend on sustainable tourism to attain long term economic prosperity and well-being for their citizens. As they become more dependent on tourism for their growth, they are more concerned with improving their competitiveness to adapt to a highly charged competitive environment and to the dynamic market conditions. The quintessential problem is how to achieve, maintain, and enhance competitiveness. There is limited research on tourism destination competitiveness (TDC), and much less on small island destinations. This study concentrates on TDC with a special focus on Malta as a small Mediterranean island in an attempt to develop a comprehensive TDC framework that is useful to small island destinations, and advances models and measures to assess competitiveness based on importance-performance analysis techniques (IPA). To achieve its research objectives, this study adopts a methodological position reflecting pragmatist assumptions and uses a sequential, exploratory, Mixed Methods design strategy. In the qualitative first phase of the design, thirty-five in-depth interviews are conducted with key ‘experts’ in tourism. It emerges from the participants’ description that sixty tourism-specific and business-related determinants provide a broad framework for assessing TDC. In the second phase, survey research is applied in order to develop quantitative measures to reveal the relative importance of the competitiveness factors, to assess the performance of the destination on these factors, and to identify priority areas that require immediate attention for improvement. Statistical measures and procedures are modified, introduced, and tested to establish a valid model for measuring TDC. Results show that the diagonal approach and the adjusted weighted partial ranking method for measuring importance and performance are the best combination that satisfies validity criteria. When applying these techniques to assess Malta’s competitiveness relative to a competing set of Mediterranean destinations, twelve tourism attributes and fourteen business-related factors are identified as priority areas for improvement, with the competitiveness deficiency gaps in business factors being notably higher than those in tourism-specific areas. This study has several implications for the development of TDC theory, methods, and application to small islands. It provides tourism researchers, policymakers, and practitioners with a theoretically robust framework that can assist them in the formulation of policies, the management of the destination, and the implementation of strategies to optimise resource allocation in order to enhance a destination’s competitive position. Given that there are few studies that focus on the development and measurement of TDC models for small islands, this study makes a valid contribution to knowledge. The methodological approaches adopted in this inquiry have substantive application in IPA studies both within and beyond tourism studies. The study’s outcomes are also transferable to small island destinations operating in similar environments.

The InfiniBand Architecture (IBA) network has been proposed as a new industrial standard with high-bandwidth and low-latency suitable for constructing high-performance interconnected cluster computing systems. This architecture replaces the traditional bus-based interconnection with a switch-based network for the server Input-Output (I/O) and inter-processor communications. The efficient Quality-of-Service (QoS) mechanism is fundamental to ensure the import at QoS metrics, such as maximum throughput and minimum latency, leaving aside other aspects like guarantee to reduce the delay, blocking probability, and mean queue length, etc. Performance modelling and analysis has been and continues to be of great theoretical and practical importance in the design and development of communication networks. This thesis aims to investigate efficient and cost-effective QoS mechanisms for performance analysis and improvement of InfiniBand networks in cluster-based computing systems. Firstly, a rate-based source-response link-by-link admission and congestion control function with improved Explicit Congestion Notification (ECN) packet marking scheme is developed. This function adopts the rate control to reduce congestion of multiple-class traffic. Secondly, a credit-based flow control scheme is presented to reduce the mean queue length, throughput and response time of the system. In order to evaluate the performance of this scheme, a new queueing network model is developed. Theoretical analysis and simulation experiments show that these two schemes are quite effective and suitable for InfiniBand networks. Finally, to obtain a thorough and deep understanding of the performance attributes of InfiniBand Architecture network, two efficient threshold function flow control mechanisms are proposed to enhance the QoS of InfiniBand networks; one is Entry Threshold that sets the threshold for each entry in the arbitration table, and other is Arrival Job Threshold that sets the threshold based on the number of jobs in each Virtual Lane. Furthermore, the principle of Maximum Entropy is adopted to analyse these two new mechanisms with the Generalized Exponential (GE)-Type distribution for modelling the inter-arrival times and service times of the input traffic. Extensive simulation experiments are conducted to validate the accuracy of the analytical models.

Swimming performance is primarily judged on the overall time taken for a swimmer to complete a specified distance performing a stroke that complies with current regulations defined by the Fédération Internationale de Natation (FINA), the International governing body of swimming. There are three contributing factors to this overall time; the start, free swimming and turns. The contribution of each of these factors is event dependent; for example, in a 50m event there are no turns, however, the start can be a significant contributor. To improve overall performance each of these components should be optimised in terms of skill and execution. This thesis details the research undertaken towards improving performance-related feedback in swimming. The research included collaboration with British Swimming, the national governing body for swimming in the U.K., to drive the requirements and direction of research. An evaluation of current methods of swimming analysis identified a capability gap in real-time, quantitative feedback. A number of components were developed to produce an integrated system for comprehensive swim performance analysis in all phases of the swim, i.e. starts, free swimming and turns. These components were developed to satisfy two types of stakeholder requirements. Firstly, the measurement requirements, i.e. what does the end user want to measure? Secondly, the process requirements, i.e. how would these measurements be achieved? The components developed in this research worked towards new technologies to facilitate a wider range of measurement parameters using automated methods as well as the application of technologies to facilitate the automation of current techniques. The development of the system is presented in detail and the application of these technologies is presented in case studies for starts, free swimming and turns. It was found that developed components were able to provide useful data indicating levels of performance in all aspects of swimming, i.e. starts, free swimming and turns. For the starts, an integrated solution of vision, force plate technology and a wireless iii node enabled greater insight into overall performance and quantitative measurements of performance to be captured. Force profiles could easily identify differences in swimmer ability or changes in technique. The analysis of free swimming was predominantly supported by the wireless sensor technology, whereby signal analysis was capable of automatically determining factors such as lap times variations within strokes. The turning phase was also characterised in acceleration space, allowing the phases of the turn to be individually assessed and their contribution to total turn time established. Each of the component technologies were not used in isolation but were supported by other synchronous data capture. In all cases a vision component was used to increase understanding of data outputs and provide a medium that coaches and athletes were comfortable with interpreting. The integrated, component based system has been developed and tested to prove its ability to produce useful, quantitative feedback information for swimmers. The individual components were found to be capable of providing greater insight into swimming performance, that has not been previously possible using the current state of the art techniques. Future work should look towards the fine-tuning of the prototype system into a useable solution for end users. This relies on the refinement of components and the development of an appropriate user interface to enable ease of data collection, analysis, presentation and interpretation.

The aim of the current thesis was to critically examine the reflection and experience-based learning of professional football players and coaches at a football club. Specific attention was paid to the influence that the social environment had on players and coaches experiences and the extent to which they influenced each others experience-based learning and reflective practice. A case study approach using semi-structured interviews and ethnography including participant observation, informal interviews and audio/video recordings informed the current research. Schön's (1983) experience-based theory of learning and reflective practice was used to represent coaches and players reflective practice prior to the application of Foucault (1972, 1979, 1988, 1991a) as social theory. It was found that an institutionally reproduced discourse, which emphasized the importance of winning, governed both coaches and players experience-based learning at the club. Positive discourses of reflection were introduced by coaches and embodied by willing and docile players due to the added legitimacy that was associated with their knowledge. Players reflective practice represented a technology of power as it was dominated by their coaches presence and resulted in players interpretations being normalised to the extent that they became self-surveillant. Players compliance contributed to the construction and reproduction of an overarching disciplinary culture of surveillance that was initially introduced by the club s coaches and made possible through the constant assimilation of data and different forms of performance monitoring (i.e. GPS, video-based PA, physical testing).

This thesis tests a newly developed model based on the Natyashastra, an Indian treatise on performing arts, and uses this for theatrical analysis in the contexts of British Asian theatre productions and contemporary Indian theatre in English. The study offers a tool that can provide an alternative model of analysis. By extending the existing analytical models, we can ask questions concerning the actors’ emotional manifestation and their mental state while acting. This thesis attempts to interpret the actors’ gestures and provides a structure to analyse them. In order to do that, this project uses the Natyashastra and rasa/bhava concepts as performance analysis tools, which might provide an alternate perspective to theatre analysis. The thesis reviews existing models of theatrical analysis and argues for an alternative model in Chapter One. It examines the analysis of theatre productions by scholars of British Asian theatre and contemporary Indian theatre in English in Chapter Two. Here, I review the ways in which scholars of British South Asian theatre have examined theatrical productions so far. Chapter Three tests the proposed model on four theatre productions, illustrating the ways in which theatre productions could be analysed, and identifies the model’s limitations and advantages. Chapter Four discusses findings in the light of the results analysed in Chapter Three; it also outlines some questions which needs further investigation. By doing so, this thesis contributes to the field of performance analysis and theatre studies by developing strong links between the manifestation of the actors’ bodymind, the directors' reception after their first reading of a play’s text, and playwrights’ initial emotions within the text, through production analysis.