Thesis (M.S. in Engineering Science)--Naval Postgraduate School, December 1990. / Thesis Advisor: Lum, Vincent Y. Second Reader: Wu, Thamas C. "December 1990." Description based on title screen as viewed on March 30, 2010. DTIC Identifier(s): Data base management systems, data management, multimedia data bases, data bases, data processing, tables(data), computer files, MDBMS (multimedia data base management system), Ingres data bases, abstract data types, catalog management, integrated systems, theses. Author(s) subject terms: Multimedia Database Management System, Multimedia, DBMS, MDBMS, media database. Includes bibliographical references (p. 186-187). Also available in print.

Background. Data from training sessions is gathered by a trainer from the playerswith the goal of analyzing and getting an overview of how the team is performing.The collected data is represented in tabular form, and over time the effort to inter-pret it becomes more demanding. Objectives. This thesis’ goal is to find out if there is a solution where collecting,processing and representing training data from football players can ease and improvethe trainer’s analysis of the team. Methods. A dataset is received from a football trainer, and it contains informa-tion about training sessions for his team of football players. The dataset is used tofind a suitable method and visualize the data. Feedback from the trainer is used todetermine what works and what does not. Furthermore, a survey with examples ofvisualization is given to the players and the trainer to get an understanding of howthe selected charts are interpreted. Results. Representing the attributes of most importance from received datasetrequires a chain of views (usage flow) to be introduced, from primary view to qua-ternary view. Each step in the chain tightens the level of details represented. Boxplot proved to be an appropriate choice to provide an overview of the team’s trainingdata. Conclusions. Visualizing training data gives a significant advantage to the trainerregarding team analysis. With box plotting will the trainer get an overview of theteam and can hereafter dig into more detailed data while interacting with the charts

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.

Det här arbetet utförs på uppdrag av CGI Östergötland. De har i dagsläget inget effektivt eller smidigt sätt att presentera mål och resultat från sina kundundersökningar. CGI önskar kunna filtrera data från undersökningarna och sedan visualisera dem på olika sätt. De önskar även reducera mängden manuellt arbete kring framställning av statistik. Man vill ha ett användarvänligt system för ändamålet. Syftet med arbetet är att implementera en fungerande prototyp av en dashboard enligt ovanstående önskemål. Arbetet utgick från ett Excel-ark med data som CGI tillhandahöll. NodeJs användes som backend, medans JavaScript, Ajax, HTML och Css användes som frontend, med Google Charts som visualiseringsverktyg. Dagbok fördes för att underlätta arbetsprocessen. En enklare hemsida med stapeldiagram implementerades, baserat på data från Excel-arket. Successiv utveckling av sökfunktionalitet, dynamisk färgsättning av diagram beroende på resultat i f.h. till mål och trenddiagram för att visualisera utveckling över tid. Diagram och mätare implementerades för att visualisera hur viktiga frågor besvarats av kunden. Vid eventuell vidareutveckling av produkten rekommenderas att reducera mängden av data som skickas mellan backend och frontend. Om man önskar lägga till ytterligare funktionalitet på dashboarden bör man även se över uppbyggnaden av HTML-sidan. Vidare borde man undersöka kompatibiliteten mellan Internet Explorer och Google Charts.

This study is concerned with how children interpret the slope of a line graph. Today with the vast accumulations of data which are available from computers, people are being faced with an ever increasing amount of pictorial representation of this data. Therefore it is of the utmost importance that children understand pictorial representation. Yet in spite of the popularity of graphs as tools of communication, studies show that many adults experience difficulty in reading information presented in a graphical form. The slope of the graph was chosen for this investigation because it is in this aspect of graphing (as shown by the results of the 1981 B.C. Assessment) that children in British Columbia seem to have the greatest difficulty when they reach Grade 8. The study dealt with positive, negative, zero and infinite slopes, combinations of these slopes, curvilinear graphs and qualitative graphs, that is, graphs that have no numerical data shown on the axes. The researcher chose to use a structured individual interview as a means of collecting data about how the students interpreted the slope of a line graph. Graphs used in the interviews dealt with temperature, height, weight and distance. Twenty-two students were chosen for this study. The students were found to have problems mainly with graphs dealing with distance related to time. This problem may be due to the fact that many students read only one axis and when interpreting distance seem to include direction as an added dimension of the graph. Infinite slope graphs were misinterpreted by every student, which may be due to the fact that they ignore the time axis. In general students used two methods of interpreting graphs. In some cases they observed the direction of the graph from left to right, that is, whether the slope went up or down from left to right. In other cases they examined the end points on the graph and drew their conclusions from them. The choice of method varied with the contextual material shown on the graph, which may be due to the children's concept of the parameter in the physical world and whether they see the parameter as being able to increase and decrease over time. From the study the investigator feels that more discussion of graphing by teachers and students is needed if the misconceptions are to be cleared up. Discussion of the parameters of both axes by teachers might help clear up the misconceptions students have about distance travelled over a period of time when this is expressed as a graph. There would be less chance of a graph being read as a map if the relationships between the two axes were demonstrated to students. Teachers also need to be aware of both methods used by students in interpreting graphs. / Education, Faculty of / Graduate

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.

Visualization is an important tool for making data understandable. Visualization can be used for many different purposes, such as charts on the web used to visualize a dataset. Render time is important for websites since slow response times can cause users to leave the site. When creating a website with fast render times in mind, the selection of JavaScript library may be crucial. This work aims to determine if dataset size and/or chart type affects the render time of charts created by different JavaScript libraries. The comparison is done by a literature search to identify suitable libraries, followed by an experiment in which 40 websites are created to compare the performance of selected JavaScript libraries for rendering selected chart types. The results show that while both dataset size and chart type affect the render time in most cases, the libraries scale differently depending on the dataset size.

Despite the fact that considerable information now exists on the major oceanic current system, off the Pacific Coast, little is known about the near shore currents in many regions of the west coast states. The Bodega Bay area of California is a case in point. Because of the proposed construction of a nuclear-powered steam plant on Bodega Head and its proximity to both the Pacific Marine Station of the University of the Pacific and to the future marine laboratory of the University of California, it has become necessary to learn as much as possible about the currents in the immediate vicinity of Bodega head. Prior to 1962, few or no current studies were made within the fifty fathom curve off Bodega Bay, although the Pacific Marine Station maintained two oceanographic stations off Bodega Head monthly from 1959 to 1963 as part of the CALCOFI program. One of these stations was at the head of Bodega Canyon, some 25 miles offshore, and the was on the 50 fathom isobath, about five miles offshore. This study describes the results of 28 drift bottle experiments performed from July 1962 to July 1963 in the Bodega Bay region. The point of release of the drift bottles in all experiments except the last three was the cove of Bodega Head about 4000 feet south of Horseshoe Cove. (This cove would be the outfall area for the effluent waters from a power generation plant on Bodega Head.) Two of the other three drift bottle releases were on a line WSW from Bodega Head to the head of Bodega Canyon, while the third release was just north of the mouth of Stemple Creek in Bodega Bay.

Épreuves Classantes Nationales informatisés (ECNi) är ett nationellt prov som franska läkarstudenter skriver för att gå vidare till sin tredje utbildningsperiod, där de väljer sin specialitet och region. Studenter som presterar bäst på provet får jobberbjudanden inom den region som är deras preferens. Det är därför viktigt för studenterna att veta deras relativa eller estimera de placering innan de genomför provet. Hypocampus är en adaptiv webbaserad läroplattform vilket används av franska läkarstudenter för att förbereda sig för ECNi-provet. Plattformen erbjuder personlig anpassningsbar utbildningsplan utifrån kognitiv förmåga, kunskapsnivå och visualiserar inlärningsprocessen för studenter och lärare. Dock, erbjuder inte plattformen möjligheten för studenter att jämföra sin egna prestation mot andra studenter. Syftet med denna studie är därför att hitta en visualiseringsteknik för att jämföra studenters prestation. Flera visualiseringstekniker valdes och utvärderades med hjälp av kvalitativa och kvantitativa metoder. Resultatet från studien visar att det finns lovande resultat inom att använda datavisualisering som tillvägagångssätt vid jämförande av studenters prestation och att visualisering med histogram föredrogs över andra visualiseringar inom kontexten att jämföra en students prestation mot andra studenter i systemet. / The Épreuves Classantes Nationales informatisés (ECNi) is a national ranking examination that all medical students in France must pass to proceed to the third training cycle, where they choose their specialty and medical region. Students who achieve the highest rankings will be offered jobs in the geographic location of their choice. It is, therefore, important that students know their relative or estimated position on the ranked list before they take the exam. Hypocampus is an online adaptive web-based learning platform used by medical students in France to prepare for the ECNi. The platform offers a personalized learning path adaptable to students’ cognitive skills, knowledge level, and visualizations of learning progress for students and teachers. However, it does not allow students to compare their performance or knowledge with other students. This work aims to explore different information visualization techniques for visual comparison of students’ performance. Several visualization prototypes were designed and evaluated with the expert reviews method. The findings of this work show promising results in using the data visualization approach for comparison of students’ performance and that histogram-visualization was preferred over the other visualizations in the context of comparing a students’ performance to other students in the system.

This study is concerned with the design of cumulative sum charts based on a minimum cost criterion when there are multiple assignable causes occurring randomly, but with known effect. A cost model is developed that relates the design parameters (i.e. sampling interval, decision limit, reference value and sample size) of a cusum chart and the cost and risk factors of the process to the long run average loss cost per hour for the process. Optimum designs for various sets of cost and risk factors are found by minimizing the long run average loss-cost per hour of the process with respect to the design parameters of a cusum chart. Optimization is accomplished by use of Brown's method. A modified Brownian motion approximation is used for calculating ARLs in the cost model. The nature of the loss-cost function is investigated numerically. The effects of changes in the design parameters and in the cost and risk factors are also studied. An investigation of the limiting behavior of the loss-cost function as the decision limit approaches infinity reveals that in some cases there exist some points that yield a lower loss-cost than that of the local minimum obtained by Brown's method. It is conjectured that if the model is extended to include more realistic assumption about the occurrence of assignable causes then only the local minimum solutions will remain. This paper also shows that the multiple assignable cause model can be well approximated by a matched single cause model. Then in practice it may be sufficient to find the optimum design for the matched. single cause model. / Ph. D.