Thesis (MScEng (Industrial Engineering))--University of Stellenbosch, 2010. / ENGLISH ABSTRACT: Any growing system is by definition in a transient phase, and consequently exhibits transient-, non-steady state-, unstable behaviour. Accordingly, this form of instability (systemic growth) is by and large conducive to the prosperity of said system. From a Control Systems perspective, transient behaviour that is not subjected to an adequate damping mechanism, does however lead to unavoidable adverse instability. Within the context of business systems, four distinct, yet interconnected entities (raw material, market demand, internal capability to deliver, and cash funds) serve as the damping mechanism to protect companies as a whole, against variation in any of the aforementioned entities. The level of damping afforded by the aforementioned entities is governed by its ability to decouple variation in one entity from undue variation in other entities. The higher the level of instability, the higher the associated level of damping required. The Thesis focuses on core instigators of negative instability within the context of Fast Growing Manufacturing Companies (FGMCs), and ultimately proposes a solution to prevent the regression from positive instability towards negative instability. / AFRIKAANSE OPSOMMING: Enige groeiende stelsel is per definisie in ’n oorgangsfase en vertoon gevolglik verbygaande-, niestabiele oorgangsgedrag. Dienooreenkomstig is hiérdie vorm van onstabiliteit (sistemiese groei) in die algemeen bevorderlik vir die welvaart van genoemde stelsel. Vanuit ’n Beheerstelsels oogpunt, lei oorgangsgedrag wat nie onderworpe is aan ’n voldoende dempingsmeganisme nie, egter tot onafwendbare negatiewe onstabiliteit. Binne ’n besigheidstelsel konteks dien vier afsonderlike, tog onderlingverbonde entiteite (roumateriaal, markaanvraag, interne bekwaamheid om te lewer, en kontantfondse) as die dempingsmeganisme om besighede holisties te beskerm teen variasie in enige van die voorgenoemde entiteite. Die dempingsvlak wat deur die voorgenoemde entiteite gegun word, word bepaal deur dié se vermoë om variasie in een entiteit te ontkoppel van variasie in ander entiteite. Hoe hoër die vlak van onstabiliteit, hoe hoër die vereiste vlak van demping. Die Tesis fokus op kern aanstigters van negatiewe onstabiliteit binne die konteks van VinnigGroeiende Vervaardigingsbesighede en stel uiteindelik ’n oplossing voor om die regressie vanaf positiewe onstabiliteit na negatiewe onstabiliteit te verhoed.

Thesis (MScEng (Industrial Engineering))--University of Stellenbosch, 2011. / ENGLISH ABSTRACT: Applying the Industrial Engineering systems approach, this dissertation utilised the theories and propositions of previous studies to argue (model) the cause of financial herd behaviour and the subsequent momentum effect. From this, a hypothesis was postulated to test: whether momentum is a common attribute amongst top performing shares, whether technical analysis indicators can better identify the phenomenon, and whether the return from these shares would justify momentum as a viable investment strategy. A unique experiment derived from previous academic studies was adapted to explore the degree of the momentum phenomenon. This was done by ranking shares according to both technical analysis as well as pure price performance momentum criteria. Returns were translated as a rank in relation to the market as a whole, thereby minimising any effects that different market periods could have on a momentum return relationship. The degree of the relationship was evaluated by applying the alternative Spearman Rank Order Correlation Co-efficient in conjunction with a permutation test to determine the statistical significance of any trends. The viability of the phenomenon as an investment strategy was gauged by comparing annualised average returns against both the market capitalisation weighted JSE All Share Index as well as against an un-weighted representation of the market. The results revealed a seemingly unambiguous co-dependence between momentum and return with statistically significant trends being ever present. Applying the maximum taxes and trading costs revealed that the highest ranked momentum shares did indeed outperform both market benchmarks from the period of January 1990 to August 2009, suggesting the validity of the philosophy as an investment strategy. The outcome of the study in part rejected the null hypothesis, as technical indicators were unable to identify future top performing shares better, with price performance momentum measures delivering the superior returns. Future studies may include optimising the various technical indicators towards the JSE rather than using generic settings. Other interesting topics could include combining momentum with other investment strategies to investigate synergy and further pinpointing the source of the phenomenon. Over the past number of years, tighter controls and monitoring of investments has resulted in the documentation of the individual number of shareholders who are buying and selling shares. Utilising this data over the next number of years, an experiment could attempt to relate the number of individual investors trading in a particular share to herd behaviour and the subsequent momentum effect. / AFRIKAANSE OPSOMMING: Die verhandeling, binne die bedryfsingenieursstelsels benadering, gebruik teorieë en voorstelle van vorige studies om die gevolge van finansiële gedrag en die gevolglike momentum effek te bespreek. Uit die analise is ‘n voorstel saamgestel om die volgende te toets:Is momentum ‘n algemene verskynsel by aandele wat goed presteer, en kan tegniese analitiese indikatore die verskynsel beter verklaar, en dui die opbrengs van die aandele daarop dat momentum ‘n bruikbare beleggingsstrategie is. ‘n Unieke eksperiment uit vorige studies is aangepas om die aard van die momentum verskynsel te ondersoek. Dit was gedoen deur aandele volgens beide tegniese analise asook suiwer prestasie momentum kriteria te klassifiseer. Opbrengste is met die hele mark in konteks geplaas om sodoende enige impak van verskillende mark tye op die momentum opbrengs verhouding te elimineer. Die verband is opgestel deur die alternatiewe “Spearman Rank Order Correlation koëffisiënt” saam met permutasie toetse te gebruik om die statistiese belangrikheid van enige neigings uit te wys. Die geldigheid van die verskynsel as ‘n beleggingsstrategie is gemeet deur jaarlikse gemiddelde opbrengste teen beide die markkapitalisasie geweeg teen die JSE Alle Aandele Indeks sowel as ‘n ongeweegde verteenwoordiging van die mark te bepaal. Die resultate dui op ‘n interafhanklikheid tussen momentum en opbrengste met statistiese neigings altyd teenwoordig. Deur die maksimum belasting en verhandelingskoste toe te pas wys dit dat die hoogste momentum uitgewyste aandele die markriglyne uitpresteer het van Januarie 1990 tot Augustus 2009 wat die geldigheid van die benadering as ‘n beleggingsstrategie bevestig. Die studie verwerp die nul hipotese gedeeltelik in die sin dat dit nie toekomstige top presterende aandele kan uitwys nie, maar aan die ander kant gee prysprestasie momentum meting wel buitegewone opbrengs. Toekomstige studies mag die optimisering van verskeie tegniese indikatore van die JSE insluit, ‘n kombinasie van momentum met ander beleggingsstrategieë gebruik, en verder die bron van die verskynsel vas pen. Oor die afgelope aantal jare het beter beheer en die monitoring van beleggings die dokumentasie van individuele aandeelhouers moontlik gemaak. Hieride data sou kon gebruik word as ‘n toets om die korrelasie tussendie aantal aandeelhouers wat ‘n spesifieke aandeel verhandel en tropgedrag te bepaal en om dit te gebruik om die momentum effek beter te verklaar.

Thesis (MScEng (Industrial Engineering))--University of Stellenbosch, 2011. / ENGLISH ABSTRACT: Small-scale farmers have the opportunity to gain access to markets through a contract farming arrangement. The key question is whether it is financially feasible for a small-scale farmer to enter into a contract. The objectives of this study were to develop a model that could be used to determine the financial feasibility of small-scale contract broiler farming in an intensive production system, compare three different genotypes namely: Cobb500 males X Hybro G females, Ross 308 males X Potchefstroom Koekoek females (crossbred) and the purebred Potchefstroom Koekoek, and evaluate current smallscale farmers’ broiler production by means of a case study. Financial performance indicators such as the net present value, cash flow and profit and loss statements were used to analyze the feasibility of all the scenarios. The model was built in Microsoft Excel. Five hundred, 1500 and 2500 birds/cycle scale of production were analyzed. Results revealed that based on the capital costs used, a 500 birds/cycle scale of production was uneconomical and that a farmer would have to receive R25.01/kg broiler meat in order to break even. The 1500 scale of production showed much better results. A farmer could break even at R17.51/kg meat. The capital investment cost of the 2500 scale of production was so high that the farmer would have had to sell his broiler meat for R18.54/kg. Performance traits of genotypes were collected through an experiment and data was statistically analyzed using ‘Statistica 9’. Results showed that there were significant differences between the cumulative feed intake, feed conversion ratios and the European production efficiency ratio of the different genotypes. No significant difference was found in the liveability of the genotypes. Data on performance traits was used as input into the model so that the economic feasibility of the genotypes could be compared. Results showed that a purebred Potchefstroom Koekoek genotype was not suitable for an intensive production system and that the crossbreed did not perform as well as the broiler breed, but that it would be worthwhile investigating the performance traits of the cross breed under less optimal conditions or in a free-range system. The lower capital costs necessary for a freerange system, together with the high premium paid for free-range broiler meat, may give admirable results in the economic feasibility of a small-scale broiler farm. / AFRIKAANSE OPSOMMING: Kleinboere het die geleentheid om deur kontrak boerdery toegang tot markte te verkry. Die vraag is egter of dit finansieël haalbaar is vir 'n kleinboer om kontraktueel verbind te word? Die doelwitte van die studie was om: ‘n model te ontwikkel wat gebruik kan word om die finansiële lewensvatbaarheid van' n klein-skaalse braaikuikenboer te bepaal onder 'n intensiewe produksiestelsel; verskillende genotipes naamlik: Cobb500 hane X Hybro G henne, Ross 308 hane X Potchefstroom Koekoek henne (kruising) en die suiwer Potchefstroom Koekoek te evalueer en die die huidige klein-skaal boer se braaikuikenproduksie deur middel van 'n gevallestudie te evalueer. Finansiële prestasie aanwysers soos die netto huidige waarde, kontantvloei, asook wins en verlies state was gebruik om die haalbaarheid van die verskeie gevalle te analiseer. Die model is op Microsoft Excel gebou. ‘n Produksie skaal van 500, 1500 en 2500 kuikens/siklus is ontleed. Resultate het getoon dat, gebaseer op die kapitale koste wat gebruik is, 'n produksie skaal van 500 kuikens/siklus onekonomies is en dat ʼn boer R25.01/kg sal moet ontvang om gelyk te breek. Die produksie skaal van 1500 kuikens/siklus het beter resultate getoon. 'n Boer kan gelyk breek teen R17.51/kg vleis. Die kapitale beleggingskoste van die produksie skaal van 2500 kuikens/siklus was so hoog dat die boer R18.54/kg sou moes ontvang het om gelyk te breek. Prestasie van genotipes is ingesamel deur middel van 'n eksperiment en data is statisties ontleed met behulp van Statistica 9. Resultate het getoon dat daar hoogs beduidende verskille tussen die kumulatiewe voerinname, voeromsetsverhoudings en Europese produksie effektiwiteits verhouding van die verskillende genotipes is. Geen beduidende verskil is gevind in die leefbaarheid van die genotipes nie. Inligting oor die prestasie eienskappe is gebruik as insette tot die model sodat die ekonomiese haalbaarheid van die genotipes vergelyk kon word. Resultate het getoon dat 'n suiwer Potchefstroom Koekoek genotipe nie geskik is vir 'n intensiewe produksie stelsel nie en dat die kruising nie so goed soos die braaikuiken gevaar het nie, maar dat dit die moeite werd sal wees om ondersoek in te stel na die produksie potensiaal van die kruis kuiken in minder optimale toestande, soos ‘n vryloop stelsel. Die laer kapitale koste en die hoë premie wat betaal word vir vryloop braaikuikenvleis mag geloofwaardige resultate op die ekonomiese haalbaarheid van 'n kleinskaalse braaikuikenboer toon.

Thesis (MScEng (Industrial Engineering))--University of Stellenbosch, 2011. / ENGLISH ABSTRACT: South Africa has potential to grow extensively as a country supplying components to the global aerospace industry supply chains, as well as directly to OEMs like Airbus, Boeing and Cessna which are first tier suppliers. The economic crisis had a significant impact on the growth of small to medium sized enterprises (SMEs), also in aerospace companies. Before the recession, SMEs did not see the necessity to become certified with internationally accredited quality standards, because there were an abundance of business opportunities. In the current restricted business climate SMEs are increasingly realising the importance of certification. The standard that aerospace companies need to comply with, is the AS 9100 standard. Compliance to AS 9100 was previously considered as a competitive advantage (order winner) but has become a necessary prerequisite (order qualifier) to be considered for a contract. In the aerospace industry accountability, traceability, documentation and quality of parts are of critical importance. Quality of products according to specification is crucial as it has a profound effect on safety. The tendency in improving of a company's processes is to scale down on superfluous documentation. In the case of aerospace companies, this is an extremely challenging goal because traceability is of such crucial importance in this sector in terms of aircraft structural system and –operational integrity. For the purpose of this study, a small to medium manufacturer of aircraft and defence system parts was studied and considered to be representative of the aerospace industry in South Africa. The research gap amongst SMEs was investigated by means of a case study at an SME in South Africa where an IT-based AS 9100 quality management system was designed, developed and implemented. The investigation includes the analysis of the research partner's quality documents, the steps in the design and development of the quality management system (QMS) and a description of the implementation thereof. This study aims to provide the focus group (SMEs) with more knowledge when developing their quality management systems for implementation of the AS 9100 requirement to compete in the aerospace industry. It describes the historic background and current use of the AS 9100 standard as background. The objective of the case study will be to determine the generic validity of the method to be able to implement AS 9100 at a small to medium sized aerospace supplier when using the same guidelines which are followed in this specific case. The method's value and success are determined by means of an external audit (certification audit) of the company used in the case study. The method makes specific use of an IT-based infrastructure to facilitate the reduction of unnecessary documentation. Experiences gained by the author in applying AS 9100 to upgrade local manufacturing companies to aerospace suppliers to Volvo Aero Company in Sweden are briefly discussed as well as the validity to make use of these generic steps. / AFRIKAANSE OPSOMMING: Suid-Afrika het die potensiaal om betekenisvol te groei as ʼn land wat komponente lewer aan internasionale lugvaart verskaffersnetwerke. Die ekonomiese krisis het 'n beduidende impak op die groei van klein tot mediumgrootte ondernemings gehad, asook in die lugvaart-industrie. Voor die resessie, het hierdie ondernemings nie die noodsaaklikheid om akkreditasie tot internasionale kwaliteitstandaarde te verkry na waarde geag nie, weens die genoegsame beskikbaarheid van sakegeleenthede. In die huidige ekonomiese klimaat word die belangrikheid van akkreditasie egter toenemend besef. Die standaard waaraan maatskappye in die lugvaartindustrie moet voldoen is die AS 9100 kwaliteitsbeheerstelsel. Voorheen is die akkreditasie tot hierdie standaard gesien as ʼn mededingende voordeel wanneer daar getender is vir ʼn kontrak. Deesdae word dit as ʼn noodsaaklike voorvereiste beskou, voordat die besigheid se aansoek om ʼn kontrak te verkry eers oorweeg sal word. In die lugvaartnywerheid is aanspreeklikheid, naspeurbaarheid en dokumentasie van kardinale belang. Die tendens in die verbetering van 'n maatskappy se prosesse is om af te skaal ten opsigte van onnodige dokumentasie. In die geval van lug- en ruimtevaartmaatskappye, is dit 'n uiters uitdagende doel, omdat naspeurbaarheid gedurende die komponent se leeftyd van deurslaggewende belang is in hierdie sektor. Vir die doel van hierdie studie is 'n klein- tot mediumgrootte vervaardiger van lugvaartkomponente wat dien as navorsingsvennoot, bestudeer. Hulle is beskou as verteenwoordigend van die lugvaartnywerheid in Suid-Afrika vir die doel van die studie. Die navorsingsgaping is geïdentifiseer as die implementering van ʼn gehaltebeheer stelsel wat voldoen aan die AS 9100 kwaliteitsbeheer standaard. Die gevallestudie van hierdie lugvaartvervaardiger sluit die bestudering van die ontwerp, ontwikkeling en implementering van ʼn IT-gebaseerde AS 9100 gehaltestelsel in. In die studie word die navorsingsvennoot se kwaliteitstelsel en dokumente ontleed, en die stappe in die ontwerp en ontwikkeling van die nuwe stelsel verduidelik. Die implementering en die validering van die stelsel deur die outeur, word beskryf en getoets deur middel van ʼn eksterne sertifiseringsliggaam. Hierdie studie poog om as riglyn te dien vir die fokus groep (klein- tot mediumgrootte ondernemings) en hul kennis van die AS 9100 standaard te verbreed. Hierdie kennis dra potensieel by tot die ontwikkeling van hul eie gehaltebestuur stelsels en die implementering van AS 9100 vereistes sodat akkreditasie tot die standaard verkry kan word en hul die lugvaartnywerheid kan betree. Die dokument beskryf die historiese agtergrond en huidige gebruik van die AS 9100 standaard. Die doel van die gevallestudie is om die generiese waarde van die metode vas te stel sodat ander klein tot mediumgrootte ondernemings in staat sal wees om dieselfde metode te volg om AS 9100 te implementeer. Die metode se geldigheid en sukses word bepaal deur middel van 'n eksterne oudit (sertifiseringsoudit) van die navorsingsvennoot in die gevallestudie. Die metode maak gebruik van 'n spesifieke IT-gebaseerde infrastruktuur om die vermindering van onnodige dokumentasie te fasiliteer. Ervarings en bevindings van ʼn soortgelyke studie in Swede, waar die outeur lid van die implementeringspan was, word ook kortliks bespreek om die geldigheid van die generiese stappe te bepaal en te beklemtoon.

Thesis (MScEng)--Stellenbosch University, 2012. / ENGLISH ABSTRACT: Energy-related costs are increasing steadily. This is especially true in South Africa where we have been dealing with an energy crisis during the past couple of years. The increase in energy-related costs puts energy dependent industries under financial pressure. It is therefore imperative to find ways to improve the efficiency with which energy is being consumed in order to decrease the amount of money that has to be allocated to energy costs. The efficient consumption of energy at a facility is crucial and to increase that efficiency, Energy Management Programs (EMPs) should be implemented. An important component of EMPs is ascertaining the current energy consumption of a facility in order to identify areas where possible improvements can be made. This is done by completing an energy audit at the facility. After the energy audit has been completed and Energy Conservation Methods (ECMs) have been identified, the implementation of these methods should commence. The aim of this study is to determine how Industrial Engineering (IE) methods can play a more integral role in making South Africa more energy efficient. As part of this study, research was done to identify current EMCs being implemented in different areas and for different equipment in facilities. This information was compared to IE methods to identify the possible relationship between the ECMs and IE methods. Content analyses were completed on both IE and energy efficiency corpora using the Content Analysis Toolkit (CAT) program. These analyses identified important topics in these corpora and correlations between these topics in order to show correlations between the IE and energy efficiency fields. The most significant correlations identified, were between statistical methods and various energy efficiency topics. A case study was completed at a company in the Western Cape that manufactures electronic and integrated circuit products to implement the relevant ECMs. As part of the case study, an energy audit was completed at the facility. The implementation of a number of the ECMs has shown reductions in the daily kilowatt hours (kWh) consumptions. These reductions were obtained through the implementation of a Shut Down Management program, which highlights the importance of management in an energy conservation project. The application of optimisation algorithms for energy efficient design was examined through the optimisation of lighting design, using a Genetic Algorithm. It was found that a Genetic Algorithm is applicable to lighting design but requires further refinement in order to generate the most optimal design solutions. / AFRIKAANSE OPSOMMING: Kostes verbonde aan energieverbruik is voortdurend besig om toe te neem.Dit is veral relevant in Suid-Afrika waar ons tans ’n energiekrisis beleef. Hierdie toename in energieverwante kostes plaas energie-afhanklike industrieë onder groot finansiële druk. Dit is daarom belangrik om maniere te vind om energieverbruik meer effektief te maak sodat die bedrag geld wat aan energieverwante kostes toegestaan word, verminder kan word. Effektiewe energieverbruik by ’n fasiliteit is kritiek en om hierdie effektiwiteit te verbeter behoort ’n energiebestuursprogram by die fasiliteit geïmplimenteer te word. ’n Belangrike komponent van energiebestuursprogramme is die bepaling van die huidige energieverbruik en dit word gebruik om die areas te identifiseer waar moontlike verbeteringe aangebring kan word. Die energieverbruik word bepaal deur ’n energie-oudit. Nadat die energie-oudit voltooi en die energiebesparingsmetodes bepaal is, moet hierdie metodes by die fasiliteit geïmplementeer word. Hierdie studie probeer vasstel hoe bedryfsingenieurswesemetodes ‘n groter rol kan speel in die proses om Suid-Afrika meer energie-effektief te maak. Navorsing is gedoen oor energiebesparingsmetodes wat in verskillende areas en vir verskillende toerusting in fasiliteite geïmplementeer word. Hierdie inligting is daarna vergelyk met bedryfsingenieurswesemetodes om juis die moontlike verhouding tussen hierdie twee tipe metodes te identifiseer. Analises was gedoen in bedryfsingenieurswese en energie-effektiwiteitskorpusse met die gebruik van die ‘Content Analysis Toolkit’ program. Belangrike onderwerpe en verwantskappe tussen hierdie onderwerpe in die korpusse is identifiseer om sodoende korrelasies tussen die bedryfsingenieurswese- en energie-effektiwiteitsveld uit te lig. Die mees betekenisvolle korrelasies was tussen statistiese metodes en verskeie energieeffektiwiteitsonderwerpe identifiseer. ’n Gevallestudie is by ’n maatskappy in die Wes-Kaap wat geïntegreerde elektroniese stroombane vervaardig gedoen, om die relevante energiebesparingsmetodes te implementeer. ’n Energie-oudit is as deel van die gevallestudie by die fasiliteit gedoen. Die aantal energiebesparingsmetodes wat wel geïmplementeer is, het ’n verlaging in die kilowatture (kWh) teweeggebring. Hierdie verlagings is verkry deur die implementering van ’n afskakelingsbestuursprogram wat die belangrikheid van bestuur in ’n energiebesparingsprogram uitlig. Die toepaslikheid van optimiseringsalgoritmes vir energie-effektiewe ontwerp is getoets deur die optimisering van ’n liguitlegontwerp met behulp van ’n genetiese algoritme. Daar is gevind dat ’n genetiese algoritme wel toegepas kan word, maar dat dit verbeteringe benodig.

Thesis (MScEng)--Stellenbosch University, 2013. / ENGLISH ABSTRACT: The aim of this thesis is to address the need for sustainable development within waste management. It explores how sustainability can be assessed and used as the basis for high level decision making within waste management. Stellenbosch University (SU) was used as a case study to demonstrate how information can be gathered and used for decision support. The literature reviewed, showed a wide area of focus within which sustainability is defined and how businesses and organisations shift towards a model of corporate responsibility. The concept of sustainability was then presented within waste management. Life Cycle Assessment (LCA) and Multi-Criteria Decision Analysis (MCDA), were presented as management tools that could facilitate the assessment and decision making process within a sustainable waste management framework. The two management tools, Sustainable Life Cycle Analysis (SLCA) and Analytical Hierarchal Process (AHP) (branches of LCA and MCDA respectively), were used to develop a framework to be applied to SU Waste Management System. By integrating the two tools, a framework was established that could measure the sustainability of current waste management practices and provide a decision support tool. The framework was validated by applying it to the Stellenbosch University waste system. The framework that was developed delivered a set of sustainable results from which decision makers could base policy decisions. The framework then facilitated the decision making process and a sustainable waste management policy was selected. The application modelled the decision makers preferences and resulted in a policy being selected which favoured high levels of recycling and waste prevention. The results represented an approach which, when compared to the current practice, was more expensive but more environmentally friendly and socially acceptable. The findings provide an exciting basis for future research, where decisions are based on sustainable principles. The framework has potential to be expanded into other areas of management and is not limited to a university environment. / AFRIKAANSE OPSOMMING: Die doel van hierdie tesis is om die behoefte aan volhoubare ontwikkeling binne afvalbestuur aan te spreek. Die tesis ondersoek hoe die volhoubaarheid in afvalbestuur bepaal kan word, en hoe dit dan gebruik kan word as basis vir beleid besluitneming binne afvalbestuur. Die Universiteit Stellenbosch (US) is as ’n gevallestudie gebruik om te demonstreer hoe inligting versamel kan word en as ondersteuning vir beleidbesluitneming gebruik kan word. Die literatuurstudie dek ’n wye veld waarbinne daar op volhoubaarheid gefokus word. Dit wys ook hoe maatskappye en organisasies na ’n model van korporatiewe verantwoordelikheid beweeg. Die konsep van volhoubaarheid word dan binne die mileu van afvalbestuur aangebied. Die Lewenssiklus Assesering (LSA) en Multi-Kriteria Besluitnemings Analise (MKBA) wat gebruik is, kan dien as bestuur hulpmiddel om die assessering van, en besluitneming binne ’n volhoubare afvalbestuur te vergemaklik. Vanuit die twee hulpmiddels, is Volhoubare Lewens Siklus Analise (VLSA) en Analitiese Hierargiese Proses (AHP), gebruik om ’n raamwerk te ontwikkel wat toegepas is op die US. Deur die twee hulpmiddels te integreer kan ’n raamwerk geskep word wat die volhoubaarheid van die huidige afvalbestuur praktyke en wat kan dien as ‘n ondersteunende hulpmiddel met die besluitnemingsprosesse. Die waardasie van die raamwerk wat ontwikkel was, het ‘n stel volhoubare resultate opgelewer, wat besluitnemers gebruik het om hul beleidsbesluite op te baseer. Die besluitnemers se voorkeure is gebaseer op die bevindinge van die VLSA en het bepaal watter beleid gekies is. Die bevindinge het ’n duurder, maar meer omgewingsvriendelike en sosiaal aanvaarbare beleid verteenwoordig. Hierdie bevindinge bied ’n opwindende basis vir toekomstige navorsingwerk, waar besluitneming op volhoubare beginsels gebaseer is. Die raamwerk het potensiaal vir uitbreiding na ander gebiede van bestuur en is nie beperk tot ’n universiteitsomgewing nie.

Thesis (MScEng)--Stellenbosch University, 2013. / ENGLISH ABSTRACT: The aerospace- and automotive industries have an urgency to save space and reduce weight, as well as a need to increase fuel efficiency and reduce emissions. This has led to the use of lightweight structural materials, such as Ti6A14V alloy, which is the most widely used titanium alloy in the aerospace industry. This alloy has an exceptional strength-to-density ratio. The work also covers studies on tool steel 40CrMnMo7 that is used in applications in the tooling-, aerospace and automotive industry. In the quest for improved performance new alternative methods of efficiently machining these materials are investigated. One of the important criteria during machining of these materials is their machinability. This study discusses current research in high performance machining strategies and techniques for advanced materials such as Ti6Al4V and 40CrMnMo7. The properties that make these materials advantageous for the use in the aerospace- and automotive industry also make them difficult to cut. The widespread application of Ti6Al4V in the aerospace industry has encouraged investigations into cooling strategies or -techniques to maintain and improve tool life. Ti6Al4V has a low thermal conductivity causing the heat generated during machining to accumulate on the cutting edge of the tool. During various experiments the application of external compressed air blow cooling (dry cutting), flood cooling, high pressure through spindle cooling (HPTSC) and modifications thereof were investigated. The research project also evaluated the performance of a coating (TiAlN) and various coating treatments. The objectives of the HPTSC modifications were to improve the coolant stream impingement on the tool surface, effectively compressing the thermal barrier, and to reduce the chip-tool contact area. This would lead to a decrease in tool heating and wear. The modified techniques failed to increase tool life but showed signs of increased heat removal capability under the given conditions. It was observed that air blow cooling (dry cutting) delivered the best results when considering cutting materials, coating, coating treatment and cooling strategies or –techniques throughout the experiments conducted. / AFRIKAANSE OPSOMMING: Die Ruimte-en motor-industrie het 'n dringendheid om ruimte te bespaar en gewig te verminder, sowel as 'n behoefte om brandstofdoeltreffendheid te verbeter en emissies te verminder. Dit het gelei tot die gebruik van liggewig strukturele materiale, soos Ti6A14V Allooi , wat die mees gebruikte titanium allooi in die Ruimte is. Hierdie allooi het 'n uitsonderlike krag-tot-digtheid-verhouding. Die studie dek ook gereedskapstaal 40CrMnMo7 wat in die gereedskap, Ruimte-en motor-industrie aangewend word. In die soeke na verbeterde prestasie word nuwe alternatiewe metodes om effektief bewerking van hierdie materiaal ondersoek. Een van die belangrikste kriteria tydens bewerking van hierdie materiaal is die bewerkbaar daarvan. Hierdie studie bespreek die huidige navorsing in hoë prestasie bewerking strategieë en tegnieke vir gevorderde materiale, soos Ti6Al4V en 40CrMnMo7. Die eienskappe wat hierdie materiaal voordelig maak vir die gebruik in die lug-en Ruimte-en motor-industrie, maak dit terselfdetyd moeilik om te sny. Die wydverspreide toepassing van Ti6Al4V in die lug-en Ruimte industrie moedig ondersoeke aan na koelstrategieë of -tegnieke om die instrumentlewe te handhaaf en te verbeter. Ti6Al4V het lae termiese geleidingsvermoë wat veroorsaak dat die hitte, wat gegenereer word tydens bewerking, versamel op die voorpunt van die instrument. Tydens verskillende eksperimente was die toepassing van eksterne saamgeperste lugblaas-verkoeling (droë sny), vloed verkoeling, hoë-druk-deur-die-spil-afkoeling (HPTSC) en aanpassings daarvan geondersoek. Die navorsingsprojek het ook die prestasie van 'n bedekkingslaag (TiAlN) en verskeie bedekkingslaagbehandelings geëvalueer. Die doelwit van die HPTSC aanpassing was om die koelmiddelstroom beklemming op die instrument oppervlak te verbeter, en effektiewelik die termiese versperring saam te pers, asook die skerf-teenoorinstrument kontak te verminder. Dit sou lei tot 'n afname in die instrumentverwarming en -slytasie. Die gewysigde tegnieke het daarin misluk om die instrumentlewe te verhoog, maar het tekens getoon van 'n toename in hitte verwydering vermoë onder die gegewe omstandighede. Dit is dus waargeneem dat lugblaasverkoeling (droë sny) die beste resultate gelewer het in die oorweging van sny materiale, bedekkingslaag, bedekkingslaagbehandelings en verkoeling strategieë of -tegnieke wat regdeur die eksperimente uitgevoer was.

Thesis (MScEng)--Stellenbosch University, 2013. / ENGLISH ABSTRACT: There is a need for a coarse-to-fine positioning system as per a case study presented by the project collaboration partner, the Technical University of Chemnitz. The case study involves the picking and placing of piezo-ceramic micro parts into milled micro cavities. The focus of the project is the creation and development of a systematic approach for the design and the implementation of a coarse-to-fine positioning system for micro material handling. A second focus is to determine the applicability of the system for highly accurate and repeatable micro drilling and micro-milling. A systematic approach entails combining innovation management (assists in overall project structure), systems engineering (assists in specific design steps and tools) and research questions. Micro-milling was achieved, however the system proved unsuitable for highly accurate and repeatable micro drilling. The coarse-to-fine positioning system was successfully designed, built, and tested for accurate micro material handling. / AFRIKAANSE OPSOMMING: Daar bestaan ’n behoefte aan ’n grof-tot-fyn-posisioneringstelsel - soos blyk uit die gevallestudie uiteengesit deur die samewerkende projekvennoot, die Tegniese Universiteit van Chemnitz. Die gevallestudie behels die uitsoek en plasing van piezo-keramiek partikels in gefreesde mikroholtes. Hierdie projek het gefokus op die skepping en ontwikkeling van ’n stelselmatige benadering tot die ontwerp en implementering van ’n grof-tot-fyn-posisioneringstelsel vir mikromateriaalhantering en mikromasjienering. ’n Stelselmatige benadering behels dat innovasiebestuur (hulp met die algehele projekstruktuur), stelselingenieurswese (hulp met spesifieke ontwerpstappe en -hulpmiddels) en navorsingsdoelwitte gekombineer word. Die geïmplementeerde stelsel is eksperimenteel getoets en daar is bevind dat dit aan die spesifikasies en vereistes voldoen.

Thesis (MEng)-- Stellenbosch University, 2013. / ENGLISH ABSTRACT: Performance management systems are integral to many organisations. On all levels of management such performance measurements are used to drive a desired behaviour and business units, departments, as well as individuals are rewarded for meeting or exceeding set targets. In large silo-structured organisations, divisions are particularly focused on their own targets and responsibilities. This may result in a diminished view of the effect their strategies and processes may have on overall stakeholder value. These divisions execute strategies to enhance the achievement of their own goal. The execution of these strategies sometimes hampers other divisions in meeting their goals. The net effect of this hampering may result in reduced stakeholder value. A mechanism is needed through which organisational divisions can evaluate the systemic environment, in order to identify hampering processes. The case may be that their processes are hampering other divisions, or that their processes as such are being hampered. The main objective of this research study was to develop such a mechanism. This mechanism emerged through a framework which can be used during investigations of hampering processes. Such investigation is conducted by following six predefined steps to guide the investigator in identifying the hampering factors. This framework was developed by combining primarily three disciplines: Systems thinking, Performance evaluation and Supplier perceived value. The evaluation framework was validated through three case studies. In all of the cases the framework delivered the expected result. It is thus concluded that organisations can apply the framework to help identify systemic environmental factors that may hamper business processes. / AFRIKAANSE OPSOMMING: Prestasiebestuurstelsels maak ʼn integrale deel uit van die meeste organisasies. Prestasiebeoordeling word op alle vlakke van bestuur ingespan om die verlangde gedrag aan te moedig. Sake-eenhede, departemente en individue word vergoed indien hulle die gestelde doelwitte haal of oorskry. In groot silo-gedrewe organisasies is afdelings grootliks gefokus op hulle eie verantwoordelikhede en om hulle eie doelwitte te bereik. Gevolglik verminder dit soms die uitwerking wat die uitkomste van hulle strategieë en prosesse het op die belanghebbendes van die organisasie. Hierdie afdelings voer dus strategieë uit om hulle eie doelwitte te behaal. Soms verhinder hierdie strategieë ander afdelings om hulle doelwitte te bereik. Die basiese effek hiervan kan wees dat minder waarde aan die belanghebbendes deurgegee word. ‘n Organisasie het dus ʼn meganisme nodig om die sistemiese omgewing mee te evalueer en sodoende prosesse te identifiseer wat belemmer is of wat belemmering kan veroorsaak. Die hoofdoel van hierdie navorsingstudie was om so ʼn meganisme te ontwikkel. Hierdie meganisme het na vore gekom in ʼn raamwerk wat tydens ondersoeke gebruik kan word om belemmering te identifiseer. Die raamwerk is ontwikkel deur hoofsaaklik drie dissiplines in gedagte te hou: Sistemiese Benadering, Prestasie-beoordeling en die Begrip van verskafferwaarde. Die raamwerk is aan die hand van drie gevallestudies getoets en in al drie gevalle het die raamwerk die verwagte resultate opgelewer. Die gevolgtrekking is dus gemaak dat organisasies wel die raamwerk kan toegepas kan om die sistemiese omgewing te evalueer en sodoende die belemmering van prosesse op mikrovlak uit te wys.

Thesis (MEng)--Stellenbosch University, 2014. / ENGLISH ABSTRACT: Telemedicine is de ned as an electronic exchange of medical information and/or the delivery of clinical health care over a distance, by means of Information and Communication Technology (ICT). South Africa is faced with the problem of providing health care to a population in urban, as well as across vast rural areas. In addition to this, the South African health care system must deal with economical imbalances and a shortage of human resources to provide quality health care. Telemedicine services could provide a solution. Since the introduction of the rst national telemedicine services initiative in the late 1990s, a number of South African telemedicine services have been implemented in the public health care system. The majority of these telemedicine services have been prone to failure and many were prematurely terminated. The circumstances which in uence the failure or success of these services are not unknown. The lack of insight, and the high failure rate of telemedicine services implemented in the South Africa were the reasons for conducting this study. The purpose of the study is to assess telemedicine services implemented in the Western Cape public health care sector. The purpose is also to provide recommendations for improving the current and future telemedicine services in the Western Cape and other provinces. A telemedicine services assessment was conducted on a total of 26 telemedicine services identi ed at 6 health care facilities located in the Western Cape. The assessments were based on the TeleMedicine Services Maturity Model (TMSMM), which was developed speci cally for the purpose of assessing telemedicine services. The TMSMM capability statements were used as a yardstick to assess the maturity of each of the elements of telemedicine services in terms of the three service level groups (micro-,meso- and macro-level) and ve telemedicine domains (man, machine, material, method and money). The assessment process included: (i) the identi cation of telemedicine services at the selected health care facilities; (ii) the gathering of the relevant telemedicine service data by means of structured interviews; (iii) the transformation of the complex ow of information into Data Flow Diagrams (DFDs); (iv) the loading of telemedicine services data into a data warehouse; and (v) the analysis of data by means of On-Line Analytical Processing (OLAP), as well as box-and-whisker plots and statistical correlations. Based on the results of the TMSMM assessment, an electronic questionnaire was developed and administered amongst health care workers throughout the entire Western Cape. The questionnaire con rmed that the ndings from the TMSMM assessment are indeed representative of the entire Western Cape. The assessment of the telemedicine services provides information about the elements which a ect the success or failure of these services. This therefore addresses the initial research problem and ful ls the purpose of the study. These results were used as an input to the analysis of strengths, weaknesses, opportunities and threats (SWOT) of the delivery of telemedicine services in the Western Cape public health sector. For future references and studies, the SWOT analysis provides a point of departure for a strategic telemedicine services framework for a province like the Western Cape. / AFRIKAANSE OPSOMMING: Telegeneeskunde, per de nisie, behels die deel van mediese inligting en/of die lewering van kliniese gesondheidsdienste oor 'n afstand, deur middel van inligting en kommunikasie tegnologie (ICT). Telegeneeskunde dienste is moontlik een van die oplossings vir die lewering van gesondheidsdienste vir 'n bevolking wat versprei is oor 'n groot landelike gebied binne 'n publieke gesondheidsektor wat mense hulpbronne kort om kwaliteit gesondheidsorg te lewer. Die publieke gesondeheidstelsel van Suid Afrika het 'n drie-dubbele las van siektes, ekonomiese wanbalans and 'n tekort aan mediese praktisyns. Sedert die eerste nasionale inisiatief vir telegeneeskunde dienste in die laat 1990s bekend gestel is, is 'n paar telegeneeskunde dienste in die publieke gesondheidsektor van Suid Afrika geïmplementeer. Die meerderheid van hierdie dienste blyk onsuksesvol te wees. The faktore wat die implementeringsukses beïnvloed is nog nie goed nagevors nie. Die doel van hierdie studie is om telegeneeskunde dienste wat in die Wes- Kaap publieke gesondheidsektor geïmplementeer is te ondersoek. Die doel is verdermeer om aanbevelings te maak met die oog op die verbetering van bestaande en toekomstige dienste in die Wes-Kaap asook ander provinsies. Eerstens is 'n telegeneeskunde diens assessering uitgevoer op 'n totaal van 26 dienste 6 fasiliteite. Hierdie assesserings is gebasseer of the Telegeneeskunde Diens Volwassenheidsmodel (TMSMM), wat ontwikkel is spesi ek met die doel om telegeneeskunde dienste te assesseer. Dit word gedoen deur die dienste te meet in terme van drie vlakke (mikro-, meso- en macrovlak) en vyf domeine (man, masjien, materiaal, metode en geld). Die TMSMM vermoeë-stellings word as maatstaaf gebruik. Die assesseringsproses sluit in (i) die identi sering van telegeneeskunde dienste by die aangewese gesondheidsfasiliteite; (ii) die versameling van relevante telegeneeskunde data deur middel van gestruktureerde onderhoude; (iii) die transformasie van komplekse inligtings vloei na data vloeidiagramme (DFDs); (iv) die laai van telegeneeskundige dinste data in 'n databasis; and (v) die analyse van data deur middel van aanlyn analitiese verwerking (OLAP) sowel as boxen- snorbaard gra k en statistiese korrelasies. Gebasseer op die resultate van die TMSMM assesseringsproses, is 'n elektroniese vraelys ontwikkel en geadministreer onder gesondheidswerkers regoor die Wes-Kaap ten einde te bevestig of die gevolgtrekkings van die TMSMM assessering die hele provinsie verteenwoordig. Die assessering van die telegeneeskundige dienste verskaf inligting in terme van die faktore wat die sukses van telegeneeskundie dienste beïnvloed. Sodoende word die aanvanklike navorsingsprobleem aangespreek. Hierdie resultate is toe gebruik as inset vir die analise van die sterk punte, swak punte, geleenthede en bedreigings (SWOT) in die publieke gesondheidsektor van die Wes-Kaap in terme van telegeneeskundige dienste. Hierdie SWOT-analise kan in die toekoms gebruik word as vertrekpunt vir die ontwikkeling van strategiese raamwerk vir die implementering van telegeneeskundige dienste in 'n provinsie soos die Wes-Kaap.