Thesis--M. Phil., University of Hong Kong, 1986.

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by Au Sai Kit. / Thesis (M.A.Ed.)--Chinese University of Hong Kong, 1992. / Includes bibliographical references (leaves 79-83). / ACKNOWLEDGEMENT --- p.ii / ABSTRACT --- p.iii / LIST OF TABLES --- p.vii / LIST OF FIGURES --- p.ix / Chapter CHAPTER 1 --- INTRODUCTION --- p.1 / Chapter 1.1 --- Purpose of the research --- p.2 / Chapter 1.2 --- Significance of the research --- p.4 / Chapter CHAPTER 2 --- LITERATURE REVIEW --- p.5 / Chapter 2.1 --- Literature related to cognitive skills in programming --- p.5 / Chapter 2.2 --- Literature related to programming in BASIC --- p.9 / Chapter 2.3 --- Literature related to organization aids --- p.13 / Chapter 2.4 --- Literature related to methodology --- p.23 / Chapter CHAPTER 3 --- METHODOLOGY --- p.28 / Chapter 3.1 --- Theoretical framework --- p.28 / Chapter 3.2 --- Hypotheses --- p.33 / Chapter 3.3 --- Method --- p.34 / Chapter 3.3.1 --- Procedure --- p.34 / Chapter 3.3.2 --- Subjects --- p.35 / Chapter 3.3.3 --- Instruments --- p.35 / Chapter 3.3.4 --- Design --- p.39 / Chapter 3.3.5 --- Analysis --- p.44 / Chapter CHAPTER 4 --- RESULTS AND DISCUSSION --- p.46 / Chapter 4.1 --- Reliability of the instruments --- p.46 / Chapter 4.2 --- Results and discussion --- p.49 / Chapter CHAPTER 5 --- CONCLUSIONS AND RECOMMENDATIONS --- p.71 / Chapter 5.1 --- Summary of findings --- p.71 / Chapter 5.2 --- Conclusions --- p.73 / Chapter 5.3 --- Limitations --- p.75 / Chapter 5.4 --- Recommendations --- p.77 / Bibliography --- p.79

published_or_final_version / Computer Science / Master / Master of Philosophy

Thesis submitted in fulfilment of the requirements for the degree Master of Technology: Electrical Engineering in the Faculty of Engineering at the Cape Peninsula University of Technology / Traditionally, efficiency is defined for sinusoidal networks and not for non-sinusoidal networks. For this reason, the efficiency formula and indices for efficiency calculations are reviewed. The concepts for determining powers, efficiency and power direction of flow in a non-sinusoidal network are explained. A new index „True Efficiency‟ is introduced to represent efficiency in non-sinusoidal circuits. Harmonic filters are installed in networks with harmonic distortion levels above the set standards for harmonic mitigation. However, there are no specific indices for evaluating the effectiveness of filter(s), hence the introduction of the index „Filter Effectiveness‟. Two software tools are utilised to develop flow charts and indices for evaluating true efficiency and effectiveness of harmonic filters in a power system under distorted waveform conditions. In this way, the effect that distortions have on efficiency can be determined and the effectiveness of the mitigation measure in place can be evaluated. The methodologies are developed using a step-by-step approach for two software packages. Three case studies were conducted on a large network. This network has multiple harmonic sources and capacitor banks. The first case study considered a network with two harmonic sources and three capacitor banks of which two are at the point of common coupling (PCC) and one is at a load bus; the second case study considered Case 1 with two capacitor banks at the PCC used as components for the 2nd - order filter and the third case considered Case 2 with a Notch filter added at one of the load buses. The network was simulated using DIgSILENT and SuperHarm software packages. DIgSILENT can calculate powers while SuperHarm gives current and voltages and power is hand calculated. The two packages were used together to test their compatibility and verify the network modelling. For the different investigations conducted, the software-based methodologies developed to calculate true efficiency in a network with multiple harmonic sources and capacitor banks have been shown to be effective. The indices developed for evaluating the effectiveness of harmonic filters proved to be effective too. The two software packages used proved to be compatible as the results obtained are similar. The methodologies can easily be adapted for investigations of other large networks as demonstrated in this study. The true efficiency methodologies are thus recommended for application in this field as it will help determine efficiency for networks with non-linear loads and help mitigate the distortions.

Magister Commercii - MCom / This research project focuses on the application of process improvement techniques in a clothing manufacturer to address delay problems in workflow in the factory. The objective of the research is threefold; investigate delays at the beginning of production and make suggestions, show the usefulness of continuous improvement techniques in improving activities in a clothing manufacturer and demonstrate how action research can be used in doing research in production and operation management. Using tools such as flow charts, check sheets, pareto analysis, fishbone diagrams, interviews and the "ask why five times" tool, an investigation into delays led to a second investigation into sewing defects. This established that these sewing defects are caused mainly by time constraints, the malfunctioning of machines, the wrong handling of garments, and previous operations. After an investigation using the above tools it was established that these defects could be addressed by setting realistic targets, doing regular maintenance on machines, cautioning operators to be more careful during their operations, and encouraging regular checks on garments before the next operation. The action learning methodology led to the following lessons; selecting a correct measuring tool is important, that not all tools need to be used, and that it takes time to do a research project using this method.

This study examined the ways in which diagrams and texts were used to teach verbal chains and other forms of cyclical information. One hundred twenty-nine college students were randomly assigned to one of four stimulus treatments and a comprehension test. The four treatments conditions were: Text Only (Control), Diagram Only, Text with Instructive Questions, and Diagram with Instructive Questions. Flow diagrams were more effective than texts as a presentation type when teaching cyclical information. The groups that studied diagrams scored significantly higher on the comprehension test than the groups that studied texts §(1,125) = 22.44, p < .05. However, instructive questions used as prompts or as study organizers did not enhance the instructional effectiveness of diagrams or texts. The groups that received instructive questions as an adjunct to the presentation mode scored significantly lower on the comprehension test than the groups that did not receive the adjunct questions F(1, 125) = 8.14, p < .05. Further analysis indicated no interaction among the independent variables. It was concluded that flow diagrams are more effective than text when teaching verbal chains. / Ed. D.

A computerized flow process charting application program of dBase III+ has been developed to aid in resource requirements planning and operations analysis. Traditional flow process charting has used as the following data elements: assembly number, assembly sequence number, distance travelled, time required for the activity and an activity symbol. The computerized system adds several variables to these in order to customize the application at Martin Marietta Electronic Systems. These additional variables include work center identification, machine number identification, lot sizes, set up and run times and manufacturing specifications. Additionally, the circle or operations symbol has been expanded to differentiate between manual, process and test activities. Resources requirements planning and analysis is accomplished by a series of reports where a user defines search requirements and enters three independent equation variables for the calculations. The three variables are realization factor or safety factor, resource availability in hours per month and monthly production demand. The resource requirements can be used in methods engineering, make-buy decisions and resource planning. Sensitivity analyses can be easily accomplished by changing the input variables and/or data.

This curriculum project provides instructional activities and materials to be used in teaching decomposition and flowcharting skills to students in grades 5-7. It is indicated and supported by research that the use of a variety of activities geared toward problem solving are of great value to students who will make use of decomposition and flowcharting. This project is specifically designed for teachers in grades 5-7 who wish to prepare their students for programming activities on the microcomputer. The criteria for selection of activities and materials are included. This project includes activities categorized under one of the following headings: sequencing activities, selecting information activities, flowcharting activities, and working with computer activities. Finally, the materials and activities used in this project are listed by source so that teachers might find other references that could be helpful in teaching decomposition and flowcharting to students in grades 5-7.

Made available in DSpace on 2014-07-29T15:18:21Z (GMT). No. of bitstreams: 1 FALCAO, Thiago de Faria.pdf: 2244206 bytes, checksum: 5381c96282f67e56fc8ca8880d978236 (MD5) Previous issue date: 2010-08-28 / In civil construction, logistics can be characterized as a multidisciplinary method in the production process aimed at ensuring the design of material and human resources needed for production. Based on this fact, this work presents a methodology that seeks to characterize the processes of external masonry, sub floor, masonry and internal lining mortar, besides the relevant materials to implementation of these processes through two tools: flow charts and indicators of productivity. The first is an analytical record of the process flows described above showing the sequence of tasks performed in them, through a symbolic, aiming the optimization in terms of materials between one activity and another. The second through a model of productivity measurement and analysis of proposed specifically for the Construction Industry, which is named "Model of Factors." This research has the scope to develop a construction company building a method that aims to define the flow behavior of materials in the execution of the cases cited, and an indicator system for measuring performance for the same, with the aim of generating guidelines for improving logistics efficiency at construction sites. A general guidelines has been implemented in the process of lining mortar, providing a significant percentage drop compared the OR's daily and cumulative in two moments: before and after implementation of the guideline. This percentage rose from 126.26% to 23.07% taking into account the higher values for the two moments. / Na construção civil, a logística pode ser caracterizada como um método multidisciplinar inserido no processo produtivo que visa garantir o dimensionamento dos recursos materiais e humanos necessários à produção. Diante deste fato, o presente trabalho tem como objetivo gerar diretrizes para melhoria da eficiência logística nos canteiros de obras, apresentando uma metodologia que visa caracterizar os processos de alvenaria externa, contrapiso, alvenaria interna e revestimento interno em argamassa e os materiais pertinentes para realização dos desses serviços através de duas ferramentas: diagramas de fluxo e índices de produtividade. A primeira ferramenta faz um registro analítico dos fluxos dos processos descritos anteriormente, mostrando a sequência das tarefas realizadas, por meio de uma simbologia, buscando-se a otimização em termos de materiais entre uma atividade e outra. A segunda por meio de um modelo de medição e análise da produtividade proposto especificamente para a Indústria da Construção Civil, obteve-se os índices de produtividade denominados de RUP s dos processos descritos, o que permitiu identificar os fatores intervenientes responsáveis pelo decréscimo na produção das equipes em cada um dos processos. A partir destas análises, sugeriu-se para o canteiro algumas modificações em termos de projeto, treinamento da mãode- obra, fluxo físico dos materiais e utilização de novas tecnologias com objetivo de melhorar a logística do mesmo. Foi implementada uma das diretrizes propostas no processo de revestimento interno em argamassa, proporcionando uma queda percentual significativa quando comparadas as RUP s diárias e cumulativas nos dois instantes: antes e após a implementação da diretriz. Este percentual passou de 126,26% para 23,07% levando em consideração os maiores valores obtidos nos dois momentos.