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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

HARMONIC INVESTIGATION IN LOW AND MEDIUM VOLTAGE NETWORKS USING COMPUTER SIMULATION AND MEASUREMENT DEVICES

Egner, Sean Robert William 31 October 2006 (has links)
Student Number : 9811492X - MSc dissertation - School of Electrical and Information Engineering - Faculty of Engineering and the Built Environment / This dissertation discusses the development of an ATP model of a network to aid measurement techniques in a harmonic evaluation. A theoretical back- ground discussion of various pieces of equipment and their signi#12;cance to har- monics is included. National Electricity Regulator (NRS 048) standards are discussed with refer- ence to performing a basic investigation and short comings. A test study was performed on the Brandspruit Mine in Secunda. ATP models are developed for equipment relevant to the test case, these in- clude AC{AC converters, AC{DC converters, three phase transformers and cables. Finally the measured test case is compared to simulation results and conclusions drawn.
2

Uma abordagem ontológica baseada em informações de contexto para representação de conhecimento de monitoramento de sinais vitais humanos / An ontological approach based on context information for knowledge representation and monitoring of human vital signs

Bastos, Alexsandro Beserra 21 October 2013 (has links)
Submitted by Jaqueline Silva (jtas29@gmail.com) on 2014-09-23T16:48:32Z No. of bitstreams: 2 Bastos, Alexsandro Beserra-2013-dissertação.pdf: 1520807 bytes, checksum: 5001709fca398fc1b01bbc57b11c8b76 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Jaqueline Silva (jtas29@gmail.com) on 2014-09-23T18:07:56Z (GMT) No. of bitstreams: 2 Bastos, Alexsandro Beserra-2013-dissertação.pdf: 1520807 bytes, checksum: 5001709fca398fc1b01bbc57b11c8b76 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2014-09-23T18:07:56Z (GMT). No. of bitstreams: 2 Bastos, Alexsandro Beserra-2013-dissertação.pdf: 1520807 bytes, checksum: 5001709fca398fc1b01bbc57b11c8b76 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2013-10-21 / Monitoring vital signs in intensive care units (ICU) is an everyday activity of various health professionals, including doctors, nurses, technicians and nursing assistants. In most ICUs, monitoring and recording vital signs are performed in a manual fashion and in predefined time instants. The records of measurements of vital signs in ICUs are generally written on preprinted forms, and a health professional has to re-sort those forms when he wants to get some information about the clinical state of a patient. Besides, when an abnormal measurement of vital sign is detected, a multiparameter monitor triggers audible alarms, and that alarm may not be prompted detected by the medical staff, depending on the workflow within an ICU. In that sense, this work proposes a knowledge representation model of monitoring of vital signs of patients in ICUs. The model proposed exploits the expressiveness and the formality of ontologies, rules and semantic web technologies. This promotes the consensual comprehension, the sharing and the reuse of vital signs of patients. The aim is to develop context-aware applications for monitoring human vital signs, including the storage, query support and semantic alarms triggering. / O monitoramento de sinais vitais de pacientes em unidades de terapia intensiva (UTI) é uma atividade que faz parte da rotina de vários profissionais da área da Saúde, envolvendo médicos, enfermeiros, técnicos e auxiliares de enfermagem. Em várias UTIs, o acompanhamento e o registro dos monitoramentos de sinais vitais são realizados de forma manual e em instantes de tempo pré-definidos. Nesse cenário, os registros das medições dos sinais vitais são escritos em formulários pré-impressos, e quando um profissional da saúde deseja obter alguma informação sobre o estado clínico de um paciente, ele tem que recorrer a esses formulários. Além disso, quando ocorre alguma anormalidade no monitoramento do sinal vital do paciente, um monitor multiparamétrico emite alarmes sonoros e, dependendo do fluxo de trabalho dentro da UTI, esse alarme pode não ser percebido prontamente pela equipe médica. Nesse sentido, este trabalho propõe um modelo de representação do conhecimento relativo ao monitoramento de sinais vitais de pacientes em UTIs. O modelo proposto utiliza o potencial de expressividade e formalidade de ontologias, regras e tecnologias correlatas da Web Semântica, o que promove a compreensão consensual, o compartilhamento e a reutilização de informações de sinais vitais de pacientes. Com esse modelo, espera-se também viabilizar o desenvolvimento de aplicações sensíveis a contexto que envolvem o monitoramento de sinais vitais humanos, com armazenamento, consultas e produção de alarmes em casos de anormalidades detectadas nas medições desses sinais.

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