Record keeping and management of electrical utilities inside buildings is an important aspect to ensure effective electrical distribution. The ability to find the location of each electrical feature inside a building and extract information about it helps to solve network problems faster. The use of a spatial database structure facilitates the maintenance and general operations of an electrical network across different buildings. The aim of this study is to design and develop a 3D data model to provide a management system for electrical utilities inside buildings. The geodatabase provides integrated information between different electrical components forming the network inside the specified buildings in the study area. A prototype called the PUK geodatabase was designed and developed for the NWU Potchefstroom Campus as a 3D data model. The data model consists of raster and vector data used in network datasets, relationship classes and topology rules. The aim of this project was accomplished through the 3D analysis capabilities of the model. The research determined that the prototype called the PUK geodatabase can be utilized as a 3D management system for electrical utilities across the different floor levels of a building. / Thesis (M.Sc. (Geography and Environmental Studies))--North-West University, Potchefstroom Campus, 2012

Record keeping and management of electrical utilities inside buildings is an important aspect to ensure effective electrical distribution. The ability to find the location of each electrical feature inside a building and extract information about it helps to solve network problems faster. The use of a spatial database structure facilitates the maintenance and general operations of an electrical network across different buildings. The aim of this study is to design and develop a 3D data model to provide a management system for electrical utilities inside buildings. The geodatabase provides integrated information between different electrical components forming the network inside the specified buildings in the study area. A prototype called the PUK geodatabase was designed and developed for the NWU Potchefstroom Campus as a 3D data model. The data model consists of raster and vector data used in network datasets, relationship classes and topology rules. The aim of this project was accomplished through the 3D analysis capabilities of the model. The research determined that the prototype called the PUK geodatabase can be utilized as a 3D management system for electrical utilities across the different floor levels of a building. / Thesis (M.Sc. (Geography and Environmental Studies))--North-West University, Potchefstroom Campus, 2012

A wireless sensor network is a distributed network system consisting of miniature spatially distributed autonomous devices designed for using sensors to sense the environment and cooperatively perform a specific goal. Each sensor node contains a limited power source, a sensor and a radio through which it can communicate with other sensor nodes within its communication radius. Since these sensor nodes may be deployed in inaccessible terrains, it might not be possible to replace their power sources. The radio transceiver is the hardware component that uses the most power in a sensor node and the optimisation of this element is necessary to reduce the overall energy consumption. In the data link layer there are several major sources of energy waste which should be minimised to achieve greater energy efficiency: idle listening, overhearing, over-emitting, network signalling overhead, and collisions. Sleep scheduling utilises the low-power sleep state of a transceiver and aims to reduce energy wastage caused by idle listening. Idle listening occurs when the radio is on, even though there is no data to transmit or receive. Collisions are reduced by using medium reservation and carrier sensing; collisions occur when there are simultaneous transmissions from several nodes that are within the interference range of the receiver node. The medium reservation packets include a network allocation vector field which is used for virtual carrier sensing which reduces overhearing. Overhearing occurs when a node receives and decodes packets that are not destined to it. Proper scheduling can avoid energy wastage due to over-emitting; over-emitting occurs when a transmitter node transmits a packet while the receiver node is not ready to receive packets. A protocol stack is proposed that achieves an ultra-low duty cycle sleep schedule. The protocol stack is aimed at large nodal populations, densely deployed, with periodic sampling applications. It uses the IEEE 802.15.4 Physical Layer (PHY) standard in the 2.4 GHz frequency band. A novel hybrid data-link/network cross-layer solution is proposed using the following features: a global sleep schedule, geographical data gathering tree, Time Division Multiple Access (TDMA) slotted architecture, Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), Clear Channel Assessment (CCA) with a randomised contention window, adaptive listening using a conservative timeout activation mechanism, virtual carrier sensing, clock drift compensation, and error control. AFRIKAANS : 'n Draadlose sensor-netwerk is 'n verspreide netwerk stelsel wat bestaan uit miniatuur ruimtelik verspreide outonome toestelle wat ontwerp is om in harmonie saam die omgewing te meet. Elke sensor nodus besit 'n beperkte bron van energie, 'n sensor en 'n radio waardeur dit met ander sensor nodusse binne hulle kommunikasie radius kan kommunikeer. Aangesien hierdie sensor nodusse in ontoeganklike terreine kan ontplooi word, is dit nie moontlik om hulle kragbronne te vervang nie. Die radio is die hardeware komponent wat van die meeste krag gebruik in 'n sensor nodus en die optimalisering van hierdie element is noodsaaklik vir die verminder die totale energieverbruik. In die data-koppelvlak laag is daar verskeie bronne van energie vermorsing wat minimaliseer moet word: ydele luister, a uistering, oor-uitstraling, oorhoofse netwerk seine, en botsings. Slaap-skedulering maak gebruik van die lae-krag slaap toestand van 'n radio met die doel om energie vermorsing wat veroorsaak word deur ydele luister, te verminder. Ydele luister vind plaas wanneer die radio aan is selfs al is daar geen data om te stuur of ontvang nie. Botsings word verminder deur medium bespreking en draer deteksie; botsings vind plaas wanneer verskeie nodusse gelyktydig data stuur. Die medium bespreking pakkies sluit 'n netwerk aanwysing vektor veld in wat gebruik word vir virtuele draer deteksie om a uistering te verminder. Afluistering vind plaas wanneer 'n nodus 'n pakkie ontvang en dekodeer maar dit was vir 'n ander nodus bedoel. Behoorlike skedulering kan energie verkwisting as gevolg van oor-uistraling verminder; oor-uistraling gebeur wanneer 'n sender nodus 'n pakkie stuur terwyl die ontvang nog nie gereed is nie. 'n Protokol stapel is voorgestel wat 'n ultra-lae slaap-skedule dienssiklus het. Die protokol is gemik op draadlose sensor-netwerke wat dig ontplooi, groot hoeveelhede nodusse bevat, en met periodiese toetsing toepassings. Dit maak gebruik van die IEEE 802.15.4 Fisiese-Laag standaard in die 2.4 GHz frekwensie band. 'n Nuwe baster datakoppelvlak/netwerk laag oplossing is voorgestel met die volgende kenmerke: globale slaap-skedulering, geogra ese data rapportering, Tyd-Verdeling-Veelvuldige-Toegang (TVVT) gegleufde argitektuur, Draer-Deteksie-Veelvuldige-Toegang met Botsing-Vermyding (DDVT/BV), Skoon-Kanaal-Assessering (SKA) met 'n wisselvallige twis-tydperk, aanpasbare slaap-skedulering met 'n konserwatiewe aktiverings meganisme, virtuele draer-deteksie, klok-wegdrywing kompensasie, en fout beheer. Copyright / Dissertation (MEng)--University of Pretoria, 2012. / Electrical, Electronic and Computer Engineering / unrestricted

The purpose of this dissertation is to assess digital geo-referenced information and standards for exchanging such information, especially the South African National Exchange Standard (NES). The process of setting up a standard is exacting. On the one hand, the process demands a thorough scrutiny and analysis of the objects to be standardised and of all related concepts. This is a prerequisite for ensuring that there is unanimity about their meaning and inter-relationships. On the other hand, the process requires that the standard itself be enunciated as succinctly, comprehensibly and precisely as possible. This dissertation addresses both these facets of the standards process in the context of standards for exchanging digital geo-referenced information. The dissertation begins with an analysis of geo-referenced information in general, including digital geo-referenced information. In chapters 2 and 3, the various aspects of such information are scrutinised and evaluated in more detail. The examination of concepts is backed up by a comprehensive Glossary of terms in the domain under discussion. Chapter 4 examines the nature of standards. It also proposes a novel way to approach a standard for the exchange of digital geo-referenced information: namely, that it can be viewed as a language and can accordingly be specified by a grammar. To illustrate the proposal, NES is fully specified, using the Extended Backus-Naur Form notation, in an Appendix. Apart from the advantages of being a succinct and precise formal specification, the approach also lends itself to deploying standard tools such as Lex and yacc for conformance testing and for developing interfaces to NES, as illustrated in a second appendix. As a final theme of the dissertation, an evaluation of such standards is provided. Other standards that have been proposed elsewhere for purposes similar to that of NES are surveyed in chapter 5. In chapter 6, features of NES are highlighted, including the fact that it takes a relational approach. Chapter 7 concludes the dissertation, summarising the work to date, and looking ahead to future work. AFRIKAANS : Die doel van hierdie verhandling is om versyferde geo-verwysde inligting en standaarde vir die uitruil van sulke inligting te ondersoek, met spesifieke verwysing na die Suid- Afrikaanse Nasionale Uitruilstandaard (NES). Die proses om ’n standaard op te stel is veeleisend. Aan die een kant vereis die proses ’n volledige bestudering en ontleding van die objekte wat gestandaardiseer gaan word, asook van al die verwante konsepte. Hierdie is ’n voorvereiste om te verseker dat daar oor hul betekenisse en onderlinge verwantskappe eenstemmigheid bestaan. Aan die ander kant vereis die proses dat die standaard so kernagtig, volledig en presies moontlik gestel moet word. Hierdie verhandeling spreek beide hierdie fasette van die standaardiseringsproses aan, en wel in die konteks van standaarde vir die uitruil van versyferde geo-verwysde inligting. Dié verhandling begin met ’n oorhoofse analise van geo-verwysde inligting, insluitend versyferde geo-verwysde inligting. In hoofstukke 2 en 3 word verskeie aspekte van dié inligting in meer detail ondersoek en geëvalueer. Hierdie ondersoek van konsepte word deur ’n omvattende woordelys van terme in die veld onder bespreking gesteun. Hoofstuk 4 ondersoek die aard van standaarde. Dit stel ook ’n nuwe manier voor om ’n standaard vir die uitruil van versyferde geo-verwysde inligting te benader, naamlik dat dit as ’n taal beskou kan word, en dat dit gevolglik deur middel van ’n grammatika gespesifiseer kan word. Om die voorstel te illustreer, word NES volledig in ’n aanhangsel deur middel van die Uitgebreide Backus-Naur Vorm notasie gespesifiseer. Afgesien van die voordeel van ’n kernagtige en presiese formele spesifikasie, ondersteun die benadering ook standaardgereedskap soos Lex en yacc wat vir konformeringstoetsing en vir NES koppelvlakke gebruik kan word, soos in ’n tweede aanhangsel illustreer word. As ’n finale tema van die verhandeling word ’n evaluasie van tersaaklike standaarde voorsien. Standaarde wat elders vir soortgelyke doeleindes aan dié van NES voorgestel is, word oorsigtelik in hoofstuk 5 beskou. In hoofstuk 6 word kenmerkende eienskappe van NES uitgelig, insluitend die feit dat dit op ’n relasionele benadering gebaseer is. Hoofstuk 7 sluit die verhandeling af met ’n opsomming van werk tot op datum en ’n blik op toekomstige werk. / Dissertation (MSc)--University of Pretoria, 1993. / Computer Science / unrestricted

Abstract in English, Afrikaans and Zulu / In an increasingly changing world, the attributes of human and physical environments are critical in assessing human quality of life (HQoL). The research sources consulted for this thesis point to specific relationships between urban change, ecosystem services and the HQoL. A variety of models have been developed in the global North to assist urban planners to manage the benefits and stressors related to urban shrinkage, ecosystems and HQoL. In the global South the trend is urban growth rather than shrinkage and few models are available for this context. Based on a mixed-method case-study approach, the Rietvlei Nature Reserve, located in the rapidly-growing urban peripheral zone between the Tshwane and Ekurhuleni metropolitan areas in the Gauteng province of South Africa, was selected to assess the benefits and stressors of localised urban development, conservation and sense of place. The purpose of the assessment was to develop a Greenspace Stress Model of Urban Impact (GSMUI) that would be of value to local authorities in managing the interplay of the varied functions of a nature reserve as a greenspace in the global South. Land-use changes were analysed using remote-sensing images. Semi-structured interviews were conducted with purposively-selected key informants to evaluate the functions of the Reserve and the objectives of the Ecological Management Plan for the Reserve. The benefits and risks to the Reserve, as well as the sense-of-place aspects, were identified through semi-structured interviews with 18 purposively-selected key informants, 181 on-site face-to-face semi-structured interviews with visitors to the Reserve, group discussions with interest groups and electronic surveys involving 365 respondents. Data were also collected through the researcher’s own observations and her participation in activities at the Reserve. The empirical results of the research were verified by 14 purposively-selected key specialist informants, who evaluated and ranked the identified benefits and stressors. Benefits and stressors were not ranked the same from different perspectives. Using the results of the empirical research, the researcher was able to merge and adapt a number of models developed for the management of greenspaces in the global North in order to develop the GSMUI specifically for the Rietvlei Reserve. Guidelines were also developed for the application of the GSMUI in geographically similar greenspaces in the global South. / In ‘n toenemend veranderende wêreld, is die eienskappe van menslike en fisiese omgewings krities vir die evaluering van menslike lewenskwaliteit (HQoL). Die navorsing wat geraadpleeg is, het spesifieke verwantskappe tussen stedelike verandering, ekosisteemdienste en HQoL aangedui ‘n Verskeidenheid modelle is in die globale Noorde ontwikkel om stedelike beplanners te help om die voordele en stressors verwant aan ontwikkeling (stedelike inkrimping), ekosisteme en menslike lewenskwaliteit, te bestuur. Onvoldoende modelle is nog ontwikkel vir die om die teenoorgestelde neigings in die globale Suide te bestuur. ’n Gemengdemetodes-gevallestudie-benadering is gevolg om die voordele en stressors van stedelike ontwikkeling, bewaring en sin vir plek in die Rietvlei Natuurreservaat (geleë in die snelgroeiende stedelike randgebiedsone tussen die Tshwane en Ekurhuleni Metropolitaanse gebiede in die Gauteng Provinsie van Suid-Afrika) te ondersoek. Verandering in grondgebruik is deur afstandwaarnemingsbeelde ontleed. Semi-gestruktureerde onderhoude is met doelbewus-geselekteerde sleutelinformante gevoer om die funksies van die Reservaat, sowel as die doelwitte van die Reservaat se ekologiese bestuursplan, te evalueer. Semi-gestruktureerde onderhoude met 18 doelbewus-geselekteerde sleutelinformante, 181 semi-gestruktureerde persoonlike onderhoude met besoekers aan die Reservaat en groepbesprekings is met ereveldwagters en belangegroepe gevoer, en 365 elektroniese vraelyste is ontleed ten einde die voordele en risiko’s vir die Reservaat en ook die pleksin te identifiseer. Data is ook deur middel van waarneming en deelname aan aktiwiteite in die Reservaat ingesamel. Die empiriese resultate van die navorsing is geverifieer deur 14 doelbewus-geselekteerde sleutelinformante wat die geïdentifiseerde voordele en stressors geëvalueer en geklassifiseer het. Voordele en stressors is verskillend evalueer uit verskillende oogpunte. Die gebruik van die empiriese navorsing het die navorser in staat gestel om ’n aantal modelle aan te pas wat vir die bestuur van groenruimtes in die globale Noorde ontwikkel is en te integreer ten einde die GSMUI te skep. Die CSMUI is spesifiek op die bestuur van die Rietvlei Natuurreservaat gemik. Die navorsing bied ook ‘n generiese GSMUI met implementeringsriglyne vir geografies-gelyksoortige groenruimtes in die globale Suide. / Kumhlaba oguquka njalo, isimo sabantu nesemvelo kubalulekile ekuhloleni iqophelo lempilo yabantu i-Human quality of life (HQoL). Ucwaningo oluhloliwe lukhombise ukuthi kukhona ubudlelwane obuthile phakathi kokuncipha/ukwanda, inkonzo yobudlelwane babantu nemvelo kanye ne HqoL. Lokhu kuxhumana kwehlukile kancane ezindaweni zaseNyakatho nomhlaba (ukungcipha kwedolobha) nezindawo zaseNingizimu nomhlaba lapho ukwanda kwamadolobha kugqame khona. Kwakhiwe amamodeli ahlukahlukile khona eNyakatho nomhlaba ukusiza abahleli bamadolobha ukuphatha izinzuzo nokuhluphayo okuhambisana nentuthuko (ukuncipha kwedolobha), kanye nesimo sendawo kanye neHQol. Awekho amamodeli awenziweyo ukusiza ukuphatha isimo esehlukile eNingizimi yomhlaba. Ngokusebenzisa inqubo exubile, inqubo ye-case study, iRietvlei Nature Reserve (etholakala lapho kwanda khona ngokushesha amadolobha phakathi kweTshwane neEKurhuleni kwiprovinsi laseGauteng eNingizima Afrika), yakhethwa ukuhlola izinzuzo nezingcindezi zokuthuthuka kwamadolobha, nokugcina isimo semvelo kanye nobunjalo obuthile bendawo. Injongo yalolu hlolo bekuwukwenza indawo ebizwa iGreenspace Stress Model of Urban Impact (GSMUI) ezosiza iziphathimandla zendawo ukuphatha ukuxhumana okukhona phakathi kwezinhloso ezihlukahlukene zeReserve njengendawo eluhlaza kwiNingizimu neAfrika yomhlaba. Kwahlaziywa indlela eguqukayo yokusetshenziswa komhlaba ngokusebenzisa imifanekiso ebheka ikude etholakala kuma mepi akhombisa indikimba (thematic map). Kwenziwa ama-semi-structured interviews nababambiqhaza bolwazi ababalulekile ukuhlola ukusebenza kweReserve kanye nezinhloso zohlelo olubizwa i-Ecological Management Plan for the Reserve. Izinzuzo nezingcindezi zale-Reserve, kanye nobunjalo obuthile bendawo, kwaphawulwa, ngokwenza ama-semi-structured interview nabathile ababalulekile abakhethwa abayi 18 ukuxoxa nabo, futhi kwenziwa nama-semi-structured interview ngokubhekana ubuso nobuso nezivakashi ze-Reserve ezingama 181, kanye nezingxoxo nabaqaphi abathile besiqiwi (rangers) kanye namanye amaqembu athintekayo. Ulwazi lwaqokelelwa futhi ngokuthi abacwaningi babheke lokho okwenzekayo kanye nokubamba iqhaza kwimisebenzi ye-Reserve. Imiphumela yobufakazi bocwaningo yaqinisekiswa ngosolwazi ababalulekile bobuchwepheshe abangu 14 ababekhethelwe le nhloso, abahlola babuya babeka ngamazinga izinzuzo nezingcindezi ukwenzela ukuthi abacwaningi babuye baphinde bakwazi ukwenza enye i-GSMUI. Ngokusebenzisa imiphumela yobufakazi bocwaningo, umcwaningi wakwazi ukuhlela kabusha amamodeli amaningana athile enziwe ukuphatha izindawo eziluhlaza eNyakatho lomhlaba, ukuze enze GSMUI eqondene nokuphatha iReserve laseRietvlei. Ucwaningo lubuye lwahlinzeka futhi i-GSMUI enabile engasetshenziswa njengemikhombandlela yezinye izindawo eziluhlaza ezifana nalezi khona eNingizimu yomhlaba. / Geography / Ph.D. (Geography)

Summaries in Afrikaans and English. / Hierdie studie fokus op ‘n interpretasie van die Beni Hasanmuurskildery en meegaande inskripsie wat in Graf BH3 in Egipte ontdek is. Die skildery dateer uit ongeveer 1892 v.C. en kom voor in die graftombe van die provinsiale goewerneur van die Oryxprovinsie – Khnum-hotep II. Met die muurskildery en inskripsie deur die koninklike hofskrywer Neferhotep as vertrekpunt en teoretiese raamwerk, word daar ‘n kwalitatiewe ondersoek gedoen na die herkoms, identiteit en rol van die handelaars en ander items, veral oogverf, wat in die skildery uitgebeeld word. Benewens die interpretasie van die Beni Hasanmuurskildery, steun die studie ook op beskikbare inligting in eietydse teologiese- en argeologiese publikasies. Deur ‘n multi-dissiplinêre benadering te volg, word daar gepoog om meer inligting te bekom oor die geografiese ligging en argitektuur van Graf BH3, die belangrikheid van graf-outobiografie, die identiteit van die handelaars en die doel van hulle besoek. Dit blyk dat die muurskildery ‘n belangrike gebeurtenis in Egipte en die Semitiese wêreld van die pre-monargale tydperk uitbeeld, en meer spesifiek die tyd en konteks waarin verhale van die sogenaamde ‘aartsvaders’, soos hulle in die Hebreeuse Bybel beskryf word, afgespeel het. Aangesien daar ‘n gebrek aan argeologiese en geskrewe (Bybelse en buite-Bybelse) bronne oor die proto-Israelitiese samelewing bestaan, hoop die studie om ‘n bydrae te lewer tot navorsing oor die tydperk, en veral die verhouding tussen die Semiete en Egiptenare. Spesiale aandag word gegee aan die uiterlike voorkoms van die handelaars en goewerneur, en aan die aard en funksie van elke gebruiksartikel wat in die skildery uitgebeeld word, soos die kleredrag, donkies, wapens en musiek-instrumente. Omdat daar in die inskripsie spesifiek melding gemaak word van oogverf, word die belangrikheid van oogverf ten opsigte van magies-religieuse, kultiese, mediese, begrafnis-, ekonomiese (handels-) en kosmetiese gebruike, asook die vervaardiging en samestelling daarvan, breedvoerig ondersoek / This study focuses on an interpretation of the Beni Hasan mural and accompanying inscription discovered in Tomb BH3 in Egypt. The painting dates back to about 1892 BC and is found in the tomb of the provincial governor of the Oryx province - Khnum-hotep II. With the mural and inscription by the royal court writer Neferhotep as point of departure and theoretical framework, a qualitative inquiry is made into the provenance, identity and role of the merchants and other items, especially eye painting, depicted in the painting. In addition to interpreting the Beni Hasan mural, the study also relies on available information in contemporary theological and archaeological publications. By following a multi-disciplinary approach, an attempt is made to obtain more information about the geographical location and architecture of Tomb BH3, the importance of tomb autobiography, the identity of the merchants and the purpose of their visit. It appears that the mural depicts an important event in Egypt and the Semitic world of the pre-monarchic period, and more specifically the time and context in which stories of the so-called 'patriarchs', as described in the Hebrew Bible, played. As there is a lack of archaeological and written (biblical and extra-biblical) sources on proto-Israelite society, the study hopes to contribute to research on the period, and especially the relationship between the Semites and Egyptians. Special attention is paid to the external appearance of the merchants and the governor, and to the nature and function of each commodity depicted in the painting, such as the dress, donkeys, weapons and musical instruments. Because the inscription specifically mentions eye makeup, the importance of eye makeup with regard to magical-religious, cultural, medical, economic (trade) and cosmetic uses, as well as the manufacture and composition thereof, is extensively investigated. / Biblical and Ancient Studies / D. Th. (Godsdienswetenskap)