Dissertations / Theses on the topic 'Charts, diagraxms'
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Šváchová, Mariana. "Určování způsobilosti a stability vybraného technického procesu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417798.
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This diploma thesis deals with the evaluation of the capability of a specific production process. The theoretical part of the work contains a description of statistical process control, types of control charts and evaluation of process capability. The practical part is focused on evaluating the capability of a specific process. The method of dataset collection is described at first, then this data are analyzed and the capability of this process is evaluated.
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Kantar, Martin. "Ganttovy diagramy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231384.
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The thesis is aimed at Gantt charts. Primarily on their use in production processes, such as planning and scheduling. The thesis also includes an introduction, explaining what are the Gantt charts, for what are using and what is their principle. The thesis also includes analysis and software possibilities for implementing Gantt charts with using OOP. Programmatic and theoretical analysis of the various functions that are characteristic of Gantt charts, including their internal logic and program implementation. These programmed characteristic functions of Gantt charts were composed in the form of a DLL library, which provides a simple implementation of Gantt charts. By using this library is realized the software for production management. The work is included on the DVD, except the DLL itself software with detailed descriptions of each part of the source code.
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Pong, Lih. "Formal data flow diagrams (FDFD) : a petri-net based requirements specification language /." [Hong Kong : University of Hong Kong], 1985. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12323019.
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Silverlycke, Peter. "Vidareutveckling av grafkomponent." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-23318.
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Rapporten täcker vidareutvecklingen av en grafkomponent som från början kunde visa linjediagram med datapunkter bestående av reella tal. Grafkomponenten var en del av programvaran Tunnel Manager som är utvecklad av Sogeti till Atlas Copco. Tunnel Manager används i kombination med Atlas Copcos borrigg Boomer. Grafkomponenten utvidgades med stapeldiagram med flera serier, stapeldiagram med adderade serier och med cirkeldiagram. Den utvidgades även med nya datapunktstyper i form av datum och tid. Även gruppering av data för stapeldiagram lades till. Utökad information visades också när muspekaren hölls över ett diagram, ett så kallat tooltip. Zoom och panorering i diagrammen implementerades så användaren kunde granska vissa områden i detalj. Rapporten omfattar även en utredning där det undersöktes vilken information och vilka diagram Atlas Copco hade behov av i framtiden i Tunnel Manager. Det visades sig att det fanns stort behov av att visa diverse information i diagram för att få ett bra underlag till beslutsfattning. Dels för planering av användandet av borriggen. Dels för underhåll av borriggen. När stora mängder information samlas in behövs bra sätt att sammanfatta den på. Diagram är ett mycket bra sätt för detta ändamål. Diagrammen behöver dock följa vissa grundläggande regler för att de ska vara tillförlitliga. Bland annat att diagram som jämförs ska ha samma skala för att underlätta jämförelsen. Vidareutvecklingen av grafkomponenten tog hänsyn till dessa regler, det bidrog till att den lämpar sig att använda i produktion.This report covers the further development of a chart component. The component could display a linechart with real number datapoints at the beginning. The chart component was part of as software called Tunnel Manager, developed by Sogeti for Atlas Copco. Tunnel Manager is used in combination with Atlas Copcos drilling rig Boomer. The charts added were barchart with support for several dataseries, stacked barchart with support for stacked dataseries and piechart. A new datapoint type for date and time was added. Grouping of data for the barcharts was also added. Extended information was shown when the mouse pointer was held over a diagram, a tooltip. Zoom and panning in the charts was implemented, allowing the user to view some parts in detail. The report also covers an investigation. The investigation finds out what kind of information, and what kinds of charts Atlas Copco had need of in the future in Tunnel Manager. There was a great need for displaying information in charts to get a good base for decision making. The information was needed for planning and maintenance of the drilling rigs. When a lot of information is gathered from different sources a good way is needed for compilation and displaying of the information. Charts are a very good way of doing this. The carts need to follow a set of basic rules to be trustworthy. For example if several charts is to be compared, they need to have the same scale, to make it easier to compare. The further development of the chart component took these rules into account and it made it suitable for usage in production.
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Pong, Lih, and 龐立. "Formal data flow diagrams (FDFD): a petri-netbased requirements specification language." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1985. http://hub.hku.hk/bib/B31207406.
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Marchant, Edward James. "Graphs with weighted colours and hypergraphs." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609454.
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YAMAMOTO, Shuichiro. "Reconstructing Data Flow Diagrams from Structure Charts Based on the Input and Output Relationship." Institute of Electronics, Information and Communication Engineers, 1995. http://hdl.handle.net/2237/15017.
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Shobe, Kristin N. "Variable sampling intervals for control charts using count data." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/52076.
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This thesis examines the use of variable sampling intervals as they apply to control charts that use count data. Papers by Reynolds, Arnold, and R. Amin developed properties for charts with an underlying normal distribution. These properties are extended in this thesis to accommodate an underlying Poisson distribution.Master of Science
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Lu, Chao-Wen. "Control charts based on residuals for monitoring processes with correlated observations." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40300.
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In statistical process control, it is usually assumed that observations on the process output at different times are lID. However, for many processes the observations are correlated and control charts for monitoring these processes have recently received much attention. For monitoring the process level, this study evaluates the properties of control charts, such as the EWMA chart and the CUSUM chart, based on the residuals from the forecast values of an ARMA model. It is assumed that the process mean is a ftrst order autoregressive (AR(l)) model and the observations are the mean plus a random error. Properties of these charts are evaluated using a Markov chain approach or an integral equation approach. The performance of control charts based on the residuals is compared to the performance of control charts based on the original observations. A combined chart using forecasts and residuals as the control statistics as well as a combined chart using the EWMA of observations and the EWMA of residuals as the control statistics are also studied by simulation. It is found that no universally "good" chart exists among all the charts investigated in this study.
In addition, for monitoring the process variance, two kinds of EWMA chart based on residuals are studied and compared.Ph. D.
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Genest, Blaise. "L'odyssée des graphes de diagrammes de séquences ( MSC-Graphes)." Paris 7, 2004. http://www.theses.fr/2004PA077210.
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Gopidi, Vijay Kumar. "Evaluation of Live Sequence Charts Using Play Engine Tool." Thesis, Blekinge Tekniska Högskola, Avdelningen för programvarusystem, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5428.
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Capturing a requirement is a great challenge in the initial stages of the software development, be it a system requirement or a customer requirement to the software engineers. Understanding the requirement and predicting or differentiating what may happen and what must happen is difficult especially in the complex real time systems. Live sequence charts are extensions of the message sequence charts which can specify the live ness of the requirements. And the play engine tool is used to specify, validate, and analyze the scenarios of the requirements. This thesis is to evaluate live sequence charts using the play engine tool and to see if the built-in model checkers can detect inconsistencies in the LSC’s.The requirements capturing and analysis has always been the initial criteria and main problem during the software design and development for the software engineers. It’s been very common to use natural language for capturing the requirements in the industries because of its ease of use. The graphical languages were used to represent the requirements, its behavior and the scenarios graphically or visually, for example UML. UML Sequence diagrams are used in the real time software development to capture the requirements which specifies the scenarios of the system behavior and also the interactions between the objects graphically. Message sequence charts are also a graphical language for representing the scenarios and also the behavior of the system especially in the telecommunication domain. But these two are only useful in specifying the one aspect of the behavior and not much helpful in specifying the liveness of the requirement. Liveness can be defined as something good will happen [34] or something must happen. For this reason live sequence charts were developed which can specify the liveness of the requirement. Live sequence charts are capable of specifying the scenarios what may happen and what must happen. This thesis is to evaluate the live sequence charts using the play engine tool running on the windows machine and also to study the built in model checkers for formal verification. The thesis starts with the various types of graphical representation of requirements in Software Engineering, followed by the Research Methodology, next a bit more explanation of Live Sequence Charts, Evaluation, Result, Conclusions and Lessons Learned from the thesis.
Permanent Address: C/O: K.VIJAYA H.NO. 3-1-39/12/3/2 TEACHER'S COLONY ARMOOR-503224 ANDHRAPRADESH INDIA.
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Korpela, Kathryn Schuler 1960. "A COMPARISON OF TWO MULTIVARIATE CUMULATIVE SUM CONTROL CHART TECHNIQUES." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/275513.
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Myslicki, Stefan Leopold 1953. "A VARIABLE SAMPLING FREQUENCY CUMULATIVE SUM CONTROL CHART SCHEME." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276503.
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This study uses Monte Carlo simulation to examine the performance of a variable frequency sampling cumulative sum control chart scheme for controlling the mean of a normal process. The study compares the performance of the method with that of a standard fixed interval sampling cumulative sum control chart scheme. The results indicate that the variable frequency sampling cumulative sum control chart scheme is superior to the standard cumulative sum control chart scheme in detecting a small to moderate shift in the process mean.
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Hu, Wei Long. "Candlestick pattern classification in financial time series." Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3950658.
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Berge, Siri Alva. "Phase diagrams of finite spin chains withcoupled spin and lattice vibrations." Thesis, Uppsala universitet, Materialteori, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448790.
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The spin-lattice coupling is due to itinerant electrons interacting with both spins of ions and phonons, mediating a coupling between magnetic spin moments andlattice vibrations. In this project, the coupling is studied systematically for finitequantum spin chains of size 2 – 10. The coupling is included in a Hamiltonian model with the Heisenberg exchange interaction and an external magnetic fieldresulting in an eigenvalue problem which is solved numerically to find phase diagrams of the magnetic moment of the system depending on an external magneticfield and the lattice vibration parameter. The eigenvalue problem is also solved analytically for the 2-ion chain, dimer, and 3-ion chain, trimer, systems. Based on these phase diagrams two propositions are made: the effect of the coupling is larger than an external magnetic field and the behavior of the coupling converges to a common phase diagram for larger spin chains.Kopplade spinn- och vibrationsfrihetersgrader beror på kringvandrande elektroner som växelverkar med både spin och fononer, vilket förmedlar en koppling mellan magnetiskt spinmoment och gittervibrationer. I detta projekt studeras denna koppling systematiskt för ändliga spin-kedjor av 2–10 joner. Systemet beskrivs av en Hamiltonian med Heisenberg modellen som beskriver spin-spin kopplingen samt ett externt magnetiskt fält. Detta egenvärdesproblem löses analytiskt för dimer- och trimersystem samt numeriskt för längre kedjor. Lösningarna används för att ta fram fasdiagram av de magnetiska momenten av kedjorna beroende på externt magnetfält och spin- och vibrationsfrihetsgradsparametern . Baserat på dessa fasdiagram, framförs två propositioner: kopplingens effekt är större än ett externtmagnetfält och kopplingens beteende konvergerar till ett enhetligt fasdiagram för större spinnkedjor.
Subject reader/ämnesgranskare: Anders Bergman
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Vining, G. Geoffrey. "Determining the most appropiate [sic] sampling interval for a Shewhart X-chart." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/94487.
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A common problem encountered in practice is determining when it is appropriate to change the sampling interval for control charts. This thesis examines this problem for Shewhart X̅ charts. Duncan's economic model (1956) is used to develop a relationship between the most appropriate sampling interval and the present rate of"disturbances,” where a disturbance is a shift to an out of control state. A procedure is proposed which switches the interval to convenient values whenever a shift in the rate of disturbances is detected. An example using simulation demonstrates the procedure.M.S.
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Branch, Robert C. "The effects of flow diagrams and texts with instructive questions on learning verbal chains." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54497.
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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 signiticantly 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.
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Negrová, Stefania. "Statistická regulace procesů a snížení zmetkovitosti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402586.
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The aim of the diploma´s thesis is analysis of the scrap of the chosen process, using the tools of statistical process control and proposal of appropriate containment to reduce the scrap. The thesis describes all seven basic tools of quality and the greatest attention is aimed to Shewart's control charts. One chapter discusses three methods of problem solving in technical practice, while one of the described methods is used in the practical part of the thesis.
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Chung, Jain. "Control chart procedures based on cumulative gauging scores." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/54277.
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Control charts based on cumulative gauging scores rely on gauge scoring systems used for transforming actual observations into integer gauging scores. In some cases, the gauging scores are easy to obtain by using a mechanical device such as in the go-no-go inspection process. Thus, accurate measurements of selected quality characteristics are not necessary. Also, different control purposes can be achieved p by using different scoring systems.
Cumulative gauging score charts based on two pairs of gauges are proposed to control the process mean or the standard deviation by either gauging one or several observations. Both random walk and cusum type cumulative gauging score charts are used. For controlling the process mean and standard deviation at the same time, a cusum type and a two-dimensional random walk type procedure are proposed. A gauging scheme can be applied to multivariate quality control by gauging either x² or T² statistics. A simple multivariate control chart which is based on the multivariate sign score vector is also proposed.
The exact run length distribution of these cumulative gauging score charts can be obtained by formulating the procedures as Markov chain processes. For some procedures, the average run length (ARL) can be obtained in a closed form expression by solving a system of difference equations with appropriate boundary conditions.
Comparisons based on the ARL show that the cumulative gauging score charts can detect small shifts in the quality characteristic more quickly than the Shewhart type X-chart. The efficiency of the cusum type gauging score chart is close to the regular CUSUM chart. The random walk type gauging score chart is more robust than the Shewhart and CUSUM charts to observations which have heavy a tailed distribution or which are serially correlated. For multivariate quality control. A procedure based on gauging the x² statistic has better performance than the x² chart. Also, a new multivariate control chart procedure which is more robust to the misspecification of the correlation than the x² chart is proposed.Ph. D.
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Haslegrave, John George Ernest. "Extremal results on hypergraphs, trees and regular graphs." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609876.
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Pei, Su-Cheng. "Design and implementation of a multimedia DBMS catalog management, table creation and data insertion /." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA241761.
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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.
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Zou, Xueli. "A robust Shewhart control chart adjustment strategy." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-164701/.
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Berge, Siri Alva. "Phase Diagrams of Finite Spin Chains with Coupled Spin and Lattice Vibrations." Thesis, Uppsala universitet, Materialteori, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-449117.
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The spin-lattice coupling is due to itinerant electrons interacting with both spins of ions and phonons, mediating a coupling between magnetic spin moments and lattice vibrations. In this project, the coupling is studied systematically for finite quantum spin chains of size 2 – 10. The coupling is included in a Hamiltonian model with the Heisenberg exchange interaction and an external magnetic field resulting in an eigenvalue problem which is solved numerically to find phase diagrams of the magnetic moment of the system depending on an external magneticfield and the lattice vibration parameter. The eigenvalue problem is also solved analytically for the 2-ion chain, dimer, and 3-ion chain, trimer, systems. Based on these phase diagrams two propositions are made: the effect of the coupling is larger than an external magnetic field and the behavior of the coupling converges to a common phase diagram for larger spin chains.Kopplade spinn- och vibrationsfrihetersgrader beror på kringvandrande elektroner som växelverkar med både spin och fononer, vilket förmedlar en koppling mellan magnetiskt spinmoment och gittervibrationer. I detta projekt studeras denna koppling systematiskt för ändliga spin-kedjor av 2–10 joner. Systemet beskrivs av en Hamiltonian med Heisenberg modellen som beskriver spin-spin kopplingen samt ett externt magnetiskt fält. Detta egenvärdesproblem löses analytiskt för dimer- och trimersystem samt numeriskt för längre kedjor. Lösningarna används för att ta fram fasdiagram av de magnetiska momenten av kedjorna beroende på externt magnetfält och spin- och vibrationsfrihetsgradsparametern. Baserat på dessa fasdiagram, framförs två propositioner: kopplingens effekt är större än ett externt magnetfält och kopplingens beteende konvergerar till ett enhetligt fasdiagram för större spinnkedjor.
Subject reader/ämnesgranskare: Anders Bergman
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Roy, Philippe. "Gestes et diagrammes politiques." Paris 8, 2014. http://www.theses.fr/2014PA084022.
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Nous proposons une conception du geste qui rend compte de certaines dimensions de la politique, impensée autrement. Une pensée politique qui met l'accent sur le sens (sur la manière d'être) et moins sur les idées ou vérités politiques, en quoi elle engage une certaine pensée par les corps, pouvant être inconsciente, une pensée diagrammatique. Le diagramme étant à la fois ce qui préside à l'effectuation des gestes (et leur perception) et ce qui en permet la pensée (il y a donc des gestes en pensée). Si bien qu'il a fallu s'intéresser à des gestes collectifs et montrer que le geste peut remplacer la vieille catégorie du pouvoir. D'où l'établissement d'une typologie des gestes politiques, tels ceux liés à la verticalité (domination, gouvernementalité, souveraineté populaire), ceux de relations intergestuelles ou même discursifs, allant jusqu'à la caractérisation de gestes politiques émancipateurs. Cette émancipation par les gestes est celle d'une volition des gestes pour les gestes, relevant de leur impersonnalité, d'une "Naturphilosophie" gestuelle. Nous avons soutenu cette orientation par une interprétation gestuelle du spinozisme (pensée et corps), la prolongeant par une approche événementielle du geste, engageant le virtuel et donc une mémoire des gestes. Dans le sillage d'Arendt et de Simondon nous avons pu alors préciser ce que sont des gestes émancipateurs, en insistant sur le motif du retentissement, de l'excès et sur les affects propres à ces gestes (émotions), formant alors l'équivalent d'un champ (comme en physique). Ce niveau affectif ouvre aussi la voie d'une analyse de gestes proprement affectifs allant jusqu'à la pensée d'une individualité affectiveWe propose a conception of the gesture that accounts for some dimension in politics and that has not been thought before. It is a political thought that underlines the meaning (a way of being) and not political ideas or truths, it involves a kind of thought through bodies, that can be unconscious, a diagrammatic thought. The diagram can be both what presides the realisation of gestures (and their perception) and what permits the thought (thus there are gestures in thoughts). So we had to take into account collective gestures and show that the gesture can replace the old category of power. Hence the establishment of a typology of political gestures, such as those linked to verticality (domination, governmentality, popular sovereignty), those of intergestural or even discursive relationship, to the characterisation of emancipatory political gestures. This emancipation by gestures is that of the will of gestures for gestures, as for their impersonality, a gestural "Naturphilosophie". We defended this orientation with a gestural interpretation of spinozism (thought and body), extending it by an evential approach of the gesture, involving the virtual and thus a memory of gestures. In the wake of Arendt and Simondon we could then precise what emancipatory gestures were, in insisting on the motive of the importance, the excess and the affects linked to the gestures (emotions), forming then the equivalent of a field (like in physics). This affective level also opens the way to an analysis of the gestures clearly affective to the thought of an affective individuality
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Svedenberg, Helena, and Emma Uddenberg. "From tricky data to captivating facts - Research through design regarding interesting and comprehensible charts." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-94553.
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Det ligger en stor utmaning i att presentera komplex information visuellt, så att betraktaren kan förstå datan och ta till sig budskapet. Att arbeta kreativt med färg och form för att presentera information kan underlätta förståelsen för datan samt skapa ett intresse. Ett bra verktyg för informationsvisualisering är diagram, med vilket data kan presenteras på ett pedagogiskt och överskådligt sätt. Syftet med detta designarbete har således varit att utforska hur diagram kan utformas så att de både är intresseväckande och lättförståeliga. Diagram som används av företaget Health Profile Institute är ett tydligt exempel på designproblemet, dessa har därför agerat som exempel inom denna studie. Utforskande design har använts som metod inom denna studie. Författarna har därför tagit fram ett stort antal designförslag i form av konceptskisser på olika diagramtyper. Författarna har dragit slutsatserna att diagram som både är intresseväckande och enkla att förstå kan skapas genom en väl utförd formgivning. Genom att arbeta med kontraster i färg och form, samt användning av ikoner och olika nivåer i formgivningen, orienterar diagrammet betraktaren. Dessutom kan intresse skapas eftersom det framkallar associationer hos betraktaren, intresseväckande och lättförståelighet hänger således ihop vid utformning av diagram.
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Ayeah, Ebenezer Nkwain. "The Application of Process Improvement Techniques at a Clothing Manufacturing Company in the Western Cape." University of the Western Cape, 2003. http://hdl.handle.net/11394/7773.
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Magister Commercii - MComThis 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.
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Hall, Deborah A. "A comparison of alternative methods to the shewhart-type control chart." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44642.
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A control chart that simultaneously tracks the mean and variance of a
normally distributed variable with no compensation effect is defined in this
work. This joint control chart is compared to five other charts: an Χ chart,
an s2 chart, a Reynolds and Ghosh chart, a Repko process capability plot, and
a t-statistic chart. The criterion for comparison is the probability of a Type
II sampling error. Several out-of-control cases are examined. In the case of
Repko, an equation is defined to compute the Type II error probability. The
results indicate that the Reynolds and Ghosh statistic is powerful for cases
when the variance shifts out of control. The Χ chart is powerful when the
mean shifts with moderate changes in the variance. The joint chart is
powerful for moderate changes in the mean and variance.
Master of Science
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Carlström, Alice. "En jämförande studie mellan olika JavaScriptbibliotek för visualisering : Prestandamätning av JavaScriptbibliotek för statistiska grafer och diagram." Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-15491.
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Visualisering av statistik är ett tydligt sätt att presentera data som annars kan ses som svår att tyda och analysera. Med hjälp av visualiseringar på webben kan man nå ut till många och det är ett smidigt sätt att ta med sig och dela med sig av information. Denna rapport bygger på ett experiment där olika JavaScriptbibliotek jämförs baserat på tiden det tar att rita ut diagram av olika storlekar och typer. Linjediagram, punktdiagram och stapeldiagram skapas med de olika biblioteken. Vilka bibliotek som jämförs väljs ut utifrån ett antal kriterier och Chart.js, Google Charts och Plotly.js är de som uppfyller alla krav. Undersökningar där utritningstiden mäts genomförs och resultaten visar att Chart.js är snabbast på att rita ut diagram i de flesta mätningarna. Det finns signifikanta skillnader mellan alla diagrammätningar förutom mellan Linjediagram 2 skapat med Chart.js och Linjediagram 2 skapat med Plotly.js samt Plotly.js Stapeldiagram 1 och Plotly.js Stapeldiagram 5. Mätningarna visar också att diagram som baseras på större datamängd, i de flesta fall, också har längre utritningstid än diagram baserade på mindre datamängd.
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Stoumbos, Zachary G. "Control charts applying a sequential test at fixed sampling intervals with optional sampling at fixed times." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07132007-143152/.
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Cho, Gyo-Young. "Multivariate control charts for the mean vector and variance-covariance matrix with variable sampling intervals." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/37242.
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Rannou, Klervi. "Tessellations à base de champs aléatoires gaussiens. Application à la modélisation spatiale et temporelle de l'endothélium cornéen humain." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEM032/document.
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Les tessellations, aussi appelées mosaïques, permettent de modéliser de nombreuses structures, comme des assemblages de cellules en biologie ou de grains en science des matériaux. La tessellation aléatoire la plus connue est le diagramme de Voronoï qui à partir d'un ensemble de points, appelés germes, partitionne le plan. L'approche innovante de cette thèse est d'utiliser des champs aléatoires gaussiens pour générer des germes et des distances aléatoires, qui vont permettre de simuler une grande variété de tessellations en termes de formes et de tailles des cellules.Pour connaître les propriétés des tessellations simulées à partir de champs aléatoires gaussiens, celles-ci vont être caractérisées et comparées à d'autres tessellations. Tout d'abord par une approche ponctuelle en étudiant les germes, dont leur distribution spatiale. Puis par une approche par région, en étudiant la géométrie et la morphométrie des cellules.L'endothélium cornéen humain est une monocouche de cellules formant un pavage hexagonal régulier à la naissance, et perdant de sa régularité ensuite. La qualité du greffon cornéen est donnée par certaines observations, comme la densité, l'homogénéité de la forme et des tailles des cellules endothéliales.L'évolution avec l'âge de cette mosaïque cornéenne va être caractérisée à partir d’une base d’images de l’endothélium. L'originalité est ensuite d'effectuer une estimation de l'âge d’un endothélium à partir des différentes mesures permettant de caractériser les tessellations, et enfin de mettre en place une méthode prometteuse afin de savoir si une cornée a une évolution normaleTessellations, also called mosaics, are used to model many structures, for example cellular arrangements in biology or grains in material science. The most known tessellation is the Voronoï diagram which partitions the space from a set of points, called germs. The innovative approach of this thesis is to use Gaussian random fields to generate germs and random distances. The use of random fields allows to simulate a great variety of tessellations in terms of cells forms and sizes.To study the properties of each type of tessellation, they are characterized: first, by studying the germs, including their spatial distribution, and then by analyzing the cells geometry and morphometry. These tessellations are also compared to other known tessellations.The human corneal endothelium is a mono-layer of cells forming a regular hexagonal mosaic at birth, and losing his regularity later. The corneal graft quality is given by some observations made on the endothelial mosaic (cells density, the homogeneity of cells sizes and shapes).A database of endothelium images allows to characterize the evolution with age of the corneal mosaic. The originality is to estimate the age of an endothelium based on the measures computed to characterize the tessellations, and finally to set up a promising method to evaluate if a corneal evolution is normal
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Ječmínková, Michaela. "Využití regulačních diagramů pro kontrolu jakosti." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2014. http://www.nusl.cz/ntk/nusl-224704.
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This diploma thesis deals with use of Shewhart Control Charts in quality control. The thesis describes the currently used process of quality control in the enterprise. Afterwards practical guidance for implementation of the statistical process control of the selected component and evaluation of capability is provided. An application for creating control charts and monitoring the quality of the product is included.
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Vidová, Katarína. "Statistické vlastnosti regulačních diagramů a modelů způsobilosti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417799.
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The diploma thesis is focused on process stability and capability assessment. It describes certain types of control charts, basic capability indices as well as Box-Cox transformation. The practical part of the study is concerned with applying control charts on generated data and consequently on real data. By this, it focuses on comparing various methods of estimating sample standard deviation and on the impact of non-compliance with the assumption of normal distribution of process variable on process stability and capability assessment.
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Dayson, Gaynor. "Children’s concepts about the slope of a line graph." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25377.
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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
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Hanson, Robert Alexander. "The application of a single control chart for dependent variables in multivariate quality control." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-05022009-040726/.
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Fausset, Cara Bailey. "On processing line graphs." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24605.
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Nam, Kyungdoo T. "A Heuristic Procedure for Specifying Parameters in Neural Network Models for Shewhart X-bar Control Chart Applications." Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc278815/.
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This study develops a heuristic procedure for specifying parameters for a neural network configuration (learning rate, momentum, and the number of neurons in a single hidden layer) in Shewhart X-bar control chart applications. Also, this study examines the replicability of the neural network solution when the neural network is retrained several times with different initial weights.
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Liu, Zhicheng. "Network-based visual analysis of tabular data." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43687.
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Tabular data is pervasive in the form of spreadsheets and relational databases. Although tables often describe multivariate data without explicit network semantics, it may be advantageous to explore the data modeled as a graph or network for analysis. Even when a given table design conveys some static network semantics, analysts may want to look at multiple networks from different perspectives, at different levels of abstraction, and with different edge semantics.
This dissertation is motivated by the observation that a general approach for performing multi-dimensional and multi-level network-based visual analysis on multivariate tabular data is necessary. We present a formal framework based on the relational data model that systematically specifies the construction and transformation
of graphs from relational data tables. In the framework, a set of relational operators provide the basis for rich expressive power for network modeling.
Powered by this relational algebraic framework, we design and implement a visual analytics system called Ploceus. Ploceus supports flexible construction and transformation of networks through a direct manipulation interface, and integrates dynamic network manipulation with visual exploration for a seamless analytic experience.
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Ghebretensae, Manna Zerai. "A unified approach to the economic aspects of statistical quality control and improvement." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49865.
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Assignment (MSc)--Stellenbosch University, 2004.ENGLISH ABSTRACT: The design of control charts refers to the selection of the parameters implied, including the sample size n, control limit width parameter k, and the sampling interval h. The design of the X -control chart that is based on economic as well as statistical considerations is presently one of the more popular subjects of research. Two assumptions are considered in the development and use of the economic or economic statistical models. These assumptions are potentially critical. It is assumed that the time between process shifts can be modelled by means of the exponential distribution. It is further assumed that there is only one assignable cause. Based on these assumptions, economic or economic statistical models are derived using a total cost function per unit time as proposed by a unified approach of the Lorenzen and Vance model (1986). In this approach the relationship between the three control chart parameters as well as the three types of costs are expressed in the total cost function. The optimal parameters are usually obtained by the minimization of the expected total cost per unit time. Nevertheless, few practitioners have tried to optimize the design of their X -control charts. One reason for this is that the cost models and their associated optimization techniques are often too complex and difficult for practitioners to understand and apply. However, a user-friendly Excel program has been developed in this paper and the numerical examples illustrated are executed on this program. The optimization procedure is easy-to-use, easy-to-understand, and easy-to-access. Moreover, the proposed procedure also obtains exact optimal design values in contrast to the approximate designs developed by Duncan (1956) and other subsequent researchers. Numerical examples are presented of both the economic and the economic statistical designs of the X -control chart in order to illustrate the working of the proposed Excel optimal procedure. Based on the Excel optimization procedure, the results of the economic statistical design are compared to those of a pure economic model. It is shown that the economic statistical designs lead to wider control limits and smaller sampling intervals than the economic designs. Furthermore, even if they are more costly than the economic design they do guarantee output of better quality, while keeping the number of false alarm searches at a minimum. It also leads to low process variability. These properties are the direct result of the requirement that the economic statistical design must assure a satisfactory statistical performance. Additionally, extensive sensitivity studies are performed on the economic and economic statistical designs to investigate the effect of the input parameters and the effects of varying the bounds on, a, 1-f3 , the average time-to-signal, ATS as well as the expected shift size t5 on the minimum expected cost loss as well as the three control chart decision variables. The analyses show that cost is relatively insensitive to improvement in the type I and type II error rates, but highly sensitive to changes in smaller bounds on ATS as well as extremely sensitive for smaller shift levels, t5 . Note: expressions like economic design, economic statistical design, loss cost and assignable cause may seen linguistically and syntactically strange, but are borrowed from and used according the known literature on the subject.
AFRIKAANSE OPSOMMING: Die ontwerp van kontrolekaarte verwys na die seleksie van die parameters geïmpliseer, insluitende die steekproefgrootte n , kontrole limiete interval parameter k , en die steekproefmterval h. Die ontwerp van die X -kontrolekaart, gebaseer op ekonomiese sowel as statistiese oorwegings, is tans een van die meer populêre onderwerpe van navorsing. Twee aannames word in ag geneem in die ontwikkeling en gebruik van die ekonomiese en ekonomies statistiese modelle. Hierdie aannames is potensieel krities. Dit word aanvaar dat die tyd tussen prosesverskuiwings deur die eksponensiaalverdeling gemodelleer kan word. Daar word ook verder aangeneem dat daar slegs een oorsaak kan wees vir 'n verskuiwing, of te wel 'n aanwysbare oorsaak (assignable cause). Gebaseer op hierdie aannames word ekonomies en ekonomies statistiese modelle afgelei deur gebruik te maak van 'n totale kostefunksie per tydseenheid soos voorgestel deur deur 'n verenigende (unified) benadering van die Lorenzen en Vance-model (1986). In hierdie benadering word die verband tussen die drie kontrole parameters sowel as die drie tipes koste in die totale kostefunksie uiteengesit. Die optimale parameters word gewoonlik gevind deur die minirnering van die verwagte totale koste per tydseenheid. Desnieteenstaande het slegs 'n minderheid van praktisyns tot nou toe probeer om die ontwerp van hulle X -kontrolekaarte te optimeer. Een rede hiervoor is dat die kosternodelle en hulle geassosieerde optimeringstegnieke té kompleks en moeilik is vir die praktisyns om te verstaan en toe te pas. 'n Gebruikersvriendelike Excelprogram is egter hier ontwikkel en die numeriese voorbeelde wat vir illustrasie doeleindes getoon word, is op hierdie program uitgevoer. Die optimeringsprosedure is maklik om te gebruik, maklik om te verstaan en die sagteware is geredelik beskikbaar. Wat meer is, is dat die voorgestelde prosedure eksakte optimale ontwerp waardes bereken in teenstelling tot die benaderde ontwerpe van Duncan (1956) en navorsers na hom. Numeriese voorbeelde word verskaf van beide die ekonomiese en ekonomies statistiese ontwerpe vir die X -kontrolekaart om die werking van die voorgestelde Excel optimale prosedure te illustreer. Die resultate van die ekonomies statistiese ontwerp word vergelyk met dié van die suiwer ekomomiese model met behulp van die Excel optimerings-prosedure. Daar word aangetoon dat die ekonomiese statistiese ontwerpe tot wyer kontrole limiete en kleiner steekproefmtervalle lei as die ekonomiese ontwerpe. Al lei die ekonomies statistiese ontwerp tot ietwat hoër koste as die ekonomiese ontwerpe se oplossings, waarborg dit beter kwaliteit terwyl dit die aantal vals seine tot 'n minimum beperk. Hierbenewens lei dit ook tot kleiner prosesvartasie. Hierdie eienskappe is die direkte resultaat van die vereiste dat die ekonomies statistiese ontwerp aan sekere statistiese vereistes moet voldoen. Verder is uitgebreide sensitiwiteitsondersoeke op die ekonomies en ekonomies statistiese ontwerpe gedoen om die effek van die inset parameters sowel as van variërende grense op a, 1- f3 , die gemiddelde tyd-tot-sein, ATS sowel as die verskuiwingsgrootte 8 op die minimum verwagte kosteverlies sowel as die drie kontrolekaart besluitnemingsveranderlikes te bepaal. Die analises toon dat die totale koste relatief onsensitief is tot verbeterings in die tipe I en die tipe II fout koerse, maar dat dit hoogs sensitief is vir wysigings in die onderste grens op ATS sowel as besonder sensitief vir klein verskuiwingsvlakke, 8. Let op: Die uitdrukkings ekonomiese ontwerp (economic design), ekonomies statistiese ontwerp (economic statistical design), verlies kostefunksie (loss cost function) en aanwysbare oorsaak (assignable cause) mag taalkundig en sintakties vreemd voordoen, maar is geleen uit, en word so gebruik in die bekende literatuur oor hierdie onderwerp.
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Siegl, Pavel. "Optimalizace procesu lakování." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227955.
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The diploma is focused on optimizing of rating during the process of painting by means of experimental methods and statistic analysis. Description of the study of the present state of painting process, result analysis and the project of optimal pre-set in practice.
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Ehrling, Julia. "Visualisering av loggdata från webbservrar i diagram med interaktion : En jämförelse av visualiseringstekniker med D3.js och Google Charts baserat på renderingstider." Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-17121.
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Webbserver-loggar är kraftfullt att använda för att spåra användning och förstå användares beteenden, men växer snabbt i storlek och kan vara svåra att tyda i textformat. Med hjälp av visualisering kan förståelse för data skapas. Diagram är vanligast att använda och interaktivitet är ett stort hjälpmedel för att skapa mer meningsfulla grafiska representationer. Vid skapade av diagram kan JavaScript-bibliotek användas och två välanvända och populära bibliotek är D3.js och Google Charts. På grund av en ökning av webbaserad visualisering och lättillgängligheten med analyseringsverktyg online, kommer renderingstider vid visualisering av loggdata analyseras i kombination med visualisering baserat på JavaScript-bibliotek. Ett tekniskt experiment genomförs för att ta reda på vilket bibliotek som har snabbast renderingstid. För att studien ska åstadkomma ett brett resultat utförs experiment vid både initial och interaktiv rendering av diagram med loggdata och varierande faktorer. Resultatet indikerar på att D3.js erhåller snabbast renderingstider i samtliga fallen.
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Alverson, Charlotte Y. "Exploring differences in teachers', administrators', and parents' preferences for data display and whether type of graphic display influences accuracy when extracting information /." Connect to title online (ProQuest), 2008. http://proquest.umi.com/pqdweb?did=1617305601&sid=4&Fmt=2&clientId=11238&RQT=309&VName=PQD.
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Thesis (Ph. D.)--University of Oregon, 2008.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 147-151). Also available online in ProQuest, free to University of Oregon users.
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Nováková, Veronika. "Optimalizace výrobního procesu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229501.
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The aims of this dissertation are to analyze the current state of process control, to identify the product range in selected organization and to design the process planning methodology to ensure an optimal implementation. Optimization is understood as costs minimization while keeping an acceptable continuity of supply. The dissertation contains a description of technological and non-manufacturing processes of brick products, as well as the summary and description of the basic tools of quality management.
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Bois, Valentin. "Effets de la deuxième orbitale dans les systèmes unidimensionnels de fermions alcalino-terreux ultrafroids." Thesis, Cergy-Pontoise, 2017. http://www.theses.fr/2017CERG0946/document.
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La réalisation expérimentale de la condensation de Bose-Einstein (BEC) a ouvert un nouveau champ d'investigation très fertile dans l'étude des atomes froids. En particulier, la possibilité de synthétiser des gaz de fermions piégés dans des réseaux optiques représente un développement de la plus haute importance pour la physique de la matière condensée. Ceci ouvre notamment sur la perspective d'étudier des phases quantiques exotiques stabilisées dans des systèmes d'électrons fortement corrélés.Récemment, les gaz atomiques d'alcalino-terreux ou d'ytterbium ont suscité un vif intérêt et ont été refroidis jusqu'à la dégénérescence quantique. La structure atomique particulière de ces systèmes leur confère de très hauts degrés de symétrie, grâce au découplage entre le spin nucléaire et le moment angulaire électronique. Une physique exotique conduisant à de multiple applications peut résulter de ces systèmes de hautes symétries qui ne peut être sondée que par les solides bases de la matière condensée.Dans cette thèse, on se propose d'étudier les propriétés physiques de basse énergie d'un gaz de fermions de type alcalino-terreux, piégé dans un réseau optique à une dimension. À une dimension, il est possible d'analyser les effets des interactions de manière non-perturbative par des approches de théorie des champs comme la bosonisation ou la théorie des champs conformes, et numériquement par le groupe de renormalisation de la matrice densité (DMRG). L'ensemble de ces outils sera notamment utilisé pour déterminer le diagramme de phase des gaz de fermions d'alcalino-terreux ou d'ytterbium à une dimensionExperimental realization of Bose-Einstein condensate (BEC) opened a new and rich field of investigation for the study of the cold atoms. In particular, the possibility of creating trapped fermionic gases in optical lattices represent one of the most important development for the condensed matter physics. This open the outlook of studying exotic and stabilized quantum phases in strongly correlated systems of electrons.Recently, alkline-earth or ytterbuim atomic gases have given rise to great interest and have been cooled down up to quantum degenaracy. The specific atomic structure of these systems confer them very high degrees of symetry, thanks to the decoupling beetwin the nuclear spin and the electronic angular momentum. An exotic physics which is only probe thanks to the strong fundament of the condensed matter.In this thesis, we propose to study the physical properties at low energy of a alkaline-earth-like fermionic gas, trapped in a one dimensional optical lattice. In one dimension, we are able to analyse effects of interactions in a non-pertubative way with conformal field theory or bosonization, and numerically with Density Matrix Renormalization Group (DMRG) approach. All of these tools will be used to provide the phase diagram of these alkaline-earth-like fermionic gases in one dimension
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Fine, Georges. "Méthode de correction de sonde en mesures de champs proches." Paris 11, 1989. http://www.theses.fr/1989PA112172.
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La caractérisation du diagramme de rayonnement de grandes antennes nécessite l'utilisation de techniques particulières. L'une d'entre elles consiste à mesurer le champ proche rayonné par l'antenne sur une surface qui l'entoure, puis à calculer son diagramme. Cette thèse traite des aspects théoriques et pratiques de la mesure en champ proche. Ce travail est en partie consacré au développement d'une théorie originale, fondée sur l'emploi de la théorie des distributions, pour résoudre le problème de la transformation champ proche/champ lointain avec correction de sonde. Elle s'applique dans tout système de coordonnées, si bien qu'on peut la considérer comme une unification des théories antérieures. De plus, la méthode est suffisamment générale pour envisager le cas de mesures faites à l'aide d'une sonde unique comme à l'aide de réseaux de sondes. L'utilisation de réseaux de sondes pose des problèmes spécifiques de dynamique, de couplage et de dispersion des réponses des sondes. Si la théorie établit qu'un certain nombre de ces imperfections peuvent être corrigées, des simulations numériques montrent que dans la pratique il n'est pas toujours nécessaire d'en tenir compte. Enfin, un programme de transformation champ proche/champ lointain en coordonnées cylindriques incluant les corrections de sonde et de rotation continue a été écrit puis validé par des simulations numériques et l'étude de cas réels de mesure d'antennes.
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Koláček, Luděk. "Snižování nákladů společnosti za použití nástrojů kvality." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2014. http://www.nusl.cz/ntk/nusl-224611.
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This diploma thesis deals with application of quality tools in production plant. Theoretical part deal with history of quality, current situation in quality management and describe some of quality tools. In practical part will be applied some of described quality tools. Some of them are already implemented in production but only partially and they are not used in full for more flexible and efficient production. Conclusions and results of this diploma thesis should prove that if we are using these tools in full, we can decrease extra cost in production.
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Evangelista, Sérgio Henrique. "Diagramas de limite de conformação aplicados à análise por elementos finitos de um processo de estampagem em chapas metálicas." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-17092001-133126/.
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Entre os processos de fabricação mecânicos atuais destacam-se os processos de conformação de chapas metálicas devido à sua produtividade e confiabilidade e a seus baixos custos de produção, baixo consumo de material e produtos nos formatos bem próximos dos esperados nas fases de projeto. Isto só é possível se todas as variáveis do projeto e do processo estiverem conforme as especificações prévias, exigidas principalmente em setores da indústria tais como o aeronáutico e o automobilístico. Um recurso útil para se alcançar estas expectativas é o estudo da estricção e da conformabilidade em chapas metálicas, representadas em diagramas de limite de conformação (DLC), os quais, aliados à análise numérica através do Método dos Elementos Finitos, permitem predições a respeito das variáveis de projeto. Este trabalho tem como objetivos rever e aplicar conceitos relativos a estes aspectos. O objetivo principal deste trabalho é de dispor uma metodologia de avaliação e otimização para o processo de estampagem, utilizando-se elementos finitos e DLC. Uma modificação no método de Marciniak-Kuczynski é utilizada para a obtenção do DLC. Busca-se com isto uma contribuição para a redução de custos em aplicações industriais com o uso desta metodologia através da diminuição das fases de tentativas e erros em projeto e reforma de estampos (try-outs).Nowadays, sheet metal forming processes have an important role amongst the mechanical manufacturing processes, because they are characterized by high productivity and reliability at low cost, low material waste and near net shapes from design. This is achieved by controlling the design and process parameters according to initial constraints. This scenario is common at aeronautic and at automobilistic productions . These results are obtained by studies of necking and formability in sheet metals and by the use of forming limit diagrams (FLD) and finite element numerical analysis to predict design parameters. This work reviews these concepts and presents a methodology for optimization of deep drawing processes, by using finite element method and FLD. A modification of the Marciniak-Kuczynski method has been introduced to obtain the FLD. Once this methodology has been performed, it can be possible to reduce try-outs in sheet metal dies and costs reduction can also be obtained.
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Harvey, Martha M. (Martha Mattern). "The Fixed v. Variable Sampling Interval Shewhart X-Bar Control Chart in the Presence of Positively Autocorrelated Data." Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc278763/.
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This study uses simulation to examine differences between fixed sampling interval (FSI) and variable sampling interval (VSI) Shewhart X-bar control charts for processes that produce positively autocorrelated data. The influence of sample size (1 and 5), autocorrelation parameter, shift in process mean, and length of time between samples is investigated by comparing average time (ATS) and average number of samples (ANSS) to produce an out of control signal for FSI and VSI Shewhart X-bar charts. These comparisons are conducted in two ways: control chart limits pre-set at ±3σ_x / √n and limits computed from the sampling process. Proper interpretation of the Shewhart X-bar chart requires the assumption that observations are statistically independent; however, process data are often autocorrelated over time. Results of this study indicate that increasing the time between samples decreases the effect of positive autocorrelation between samples. Thus, with sufficient time between samples the assumption of independence is essentially not violated. Samples of size 5 produce a faster signal than samples of size 1 with both the FSI and VSI Shewhart X-bar chart when positive autocorrelation is present. However, samples of size 5 require the same time when the data are independent, indicating that this effect is a result of autocorrelation. This research determined that the VSI Shewhart X-bar chart signals increasingly faster than the corresponding FSI chart as the shift in the process mean increases. If the process is likely to exhibit a large shift in the mean, then the VSI technique is recommended. But the faster signaling time of the VSI chart is undesirable when the process is operating on target. However, if the control limits are estimated from process samples, results show that when the process is in control the ARL for the FSI and the ANSS for the VSI are approximately the same, and exceed the expected value when the limits are fixed.
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Salepci, Nermin. "Real Lefschetz Fibrations." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12609183/index.pdf.
Full textAbstract:
In this thesis, we present real Lefschetz fibrations. We first study real Lefschetz fibrations around a real singular fiber. We obtain a classification of real Lefschetz fibrations around a real singular fiber by a study of monodromy properties of real Lefschetz fibrations. Using this classification, we obtain some invariants, called real Lefschetz chains, of real Lefschetz fibrations which admit only real critical values. We show that in case the fiber genus is greater then 1, the real Lefschetz chains are complete invariants of directed real Lefschetz fibrations with only real critical values. If the genus is 1, we obtain complete invariants by decorating real Lefschetz chains.
For elliptic Lefschetz fibrations we define a combinatorial object which we call necklace diagrams. Using necklace diagrams we obtain a classification of directed elliptic real Lefschetz fibrations which admit a real section and which have only real critical values. We obtain 25 real Lefschetz fibrations which admit a real section and which have 12 critical values all of which are real. We show that among 25 real Lefschetz fibrations, 8 of them are not algebraic. Moreover, using necklace diagrams we show the existence of real elliptic Lefschetz fibrations which can not be written as the fiber sum of two real elliptic Lefschetz fibrations. We define refined necklace diagrams
for real elliptic Lefschetz fibrations without a real section and show that refined necklace diagrams classify real elliptic Lefschetz fibrations which have only real critical values.
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Fillner, Patrik. "Program pro optimalizaci provozu servisního střediska." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-433251.
Full textAbstract:
This diploma thesis focuses on problematic about optimizing of service center and provides a base for creation of program for simulation and optimization. This diploma thesis also deals with hierarchical breakdown and logical structures of processes. Also there are quality determining methods and methods for visualization of processes.