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Dissertations / Theses on the topic 'Computer printers'
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1
Mayer, Christopher M. "Antialiasing methods for laser printers." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/9095.
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Thesis (B.S. and B.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1991.Includes bibliographical references (leaves 175-177).
Font and graphics antialiasing are often used methods of enhancing the output quality of video monitors. The same techniques also can enhance the quality of laser printer output. Since the laser printing process and the monitor display process differ radically, the assumptions made for antialiasing on monitors are reexamined. Raster scanning, laser modulation, xerographic transfer, information transfer, and computation are examined in the context of laser printer antialiasing. Past work on antialiasing algorithms is evaluated. A practical method of performing anti-aliasing of text, graphics, and images is developed. Standard antialiasing scan conversion algorithms are adapted to function on two dimensional binary bitmaps of vector data. Computation issues are discussed, and a fast localized scan conversion operation based on statistical models is developed and evaluated. Finally, an architecture for the high bandwidth modulation of the laser by both power and time is developed, implemented, and evaluated.
by Christopher M. Mayer.
B.S.and B.M.
2
Gattuso, Claude F. "Laser perforation for computer paper /." Online version of thesis, 1989. http://hdl.handle.net/1850/11526.
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Damera-Venkata, Niranjan. "Analysis and design of vector error diffusion systems for image halftoning /." Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004247.
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Cheung, Yuk Lung. "Application of silicon display for photo printer /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202004%20CHEUNG.
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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.Includes bibliographical references (leaves 80-82). Also available in electronic version. Access restricted to campus users.
5
Paiz, Fernando J. (Fernando Joaquin) 1976. "Tartan Threads : a method for the real-time digital recognition of secure documents in ink-jet printers." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9797.
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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.Includes bibliographical references (leaves 27-28).
Thanks to today's digital imaging technology, any ten year old child with basic computer skills can create convincing counterfeit currency. It comes as no surprise that as output quality and costs have improved in ink-jet printers, there has been a corresponding surge in digital counterfeiting of security documents. The design of a system, through which a printer can recognize a security or other protected document though identification of a watermark, presents a challenge for the application of information hiding techniques. The marking should be strong enough to provide certainty that a document was intentionally marked and robust enough to withstand the transformations inherent in the scanning and printing process. Using an extended spreadspectrum technique, a small one-dimensional thread encoded with a known multi-bit signature is generated. If the printer detects a match, printing halts and a warning message is output to the user. By applying several such threads at varying orientations, this can provide an effective first line of defense against the casual digital counterfeiter.
by Fernando J. Paiz.
S.B.and M.Eng.
6
Kurokawa, Ko. "The effect of rotation on legibility of dot-matrix characters." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43045.
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When dot-matrix characters are rotated, as might be the case in a moving map display, their dot-matrix patterns are distorted and their legibility is thus affected. In this experiment, 16 subjects performed a random search task, in which they were asked to look for a target in a random character pattern. The independent variables were the direction (clockwise or counterclockwise) and the angle of stimulus image rotation, and the target character's distance from the center of screen, which was also the center of rotation; the dependent variables were response time and response correctness.
Significant effects were found in the angle of rotation, the target character's distance from the center, and the target character. The results indicate that (1) no angle-dependent mechanism is involved in performing this task and the angle of rotation influences recognition mainly through the distortion of dot-matrix patterns, (2) the target character's (radial) distance from the center of screen is the determining factor for search time, while the x and y coordinates of the target contributed to dot-matrix pattern distortion, and (3) the target characters interacted differently with the angle and distance factors to determine the extent of distortion and their legibility.
Means to quantify the extent of distortion were discussed and the direction for future research is offered.
Master of Science
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De, Brandt T. "Development of an intelligent printer sharer." Thesis, Cape Technikon, 1993. http://hdl.handle.net/20.500.11838/1134.
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Thesis (M.Diploma in Technology)--Cape Technikon, Cape Town, 1993This thesis describes the design, development and implementation of an intelligent printer sharer, capable of servicing ten personal computers and two printers.
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Candeias, Bruno Paes. "Planejamento digital e impressão 3d, aplicado em reabilitações totais fixas sobre implantes /." São José dos Campos, 2018. http://hdl.handle.net/11449/158298.
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Orientador: Rodrigo Máximo de AraújoBanca: Eron Toshio Colauto Yamamoto
Banca: Eduardo Galera da Silva
Resumo: O objetivo desse estudo foi desenvolver uma infraestrutura de prótese total fixa sobre implantes em impressora 3D, elaborada em conjunto com uma guia cirúrgica digital, também impressa, diminuindo o número de sessões e substituindo a necessidade de moldagem logo após o procedimento cirúrgico. Para isso um paciente, sexo masculino, 60 anos de idade e apresentando apenas a presença do elemento dental 36 na arcada inferior, foi convidado a participar do estudo após leitura e assinatura de Termo de Consentimento Livre e Esclarecido. Foi realizada moldagem da arcada superior e inferior do paciente com alginato para confecção do modelo de estudo com gesso pedra especial. Os modelos foram escaneados com a utilização de scanner Xcad 3D, para a realização do planejamento cirúrgico e protético. A partir dos exames tomográficos foram obtidos os arquivos DICOM. Estes arquivos foram utilizados para o inicio do planejamento digital, sendo incluídos no software para planejamento específico. Foi realizado o planejamento virtual com o auxílio do software, sendo: instalação de 4 implantes do tipo hexágono externo de 13mm por 3,75mm cada, o que gerou automaticamente pelo software a guia cirúrgica para instalação dos mesmos. A mesma foi impressa com o uso de uma impressora 3D de polímeros. A guia cirúrgica continha quatro orifícios para instalação dos implantes planejados, permitindo também a instalação de a ut nts. p s a olo açāo dos implantes, foram instalados pilares cônicos de 4,1mm de diâme... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Digital planning and preparation of guides and prosthesis with the help of 3D printers is a reality on a daily basis, but in this study, we look for Develop a fully digitized and software-driven process to design and execute polymer and titanium printed guides and prostheses. Those Printed parts would already be structural parts of the final prosthesis, Cases of total fixed prostheses. With this we could exclude laboratory phases of the process of prosthetic preparation, optimizing time, cost and reducing everyday problems that affect clinicians in such processes as repetitions, lack of adaptation of the prosthesis structure, teeth assembly, among others. Titanium printing of such a final structure would allow an immediate installation, in Immediate loading surgeries, of the final prosthesis with the best possible adaptation, Enabling the clinician to execute cases of extreme challenges Without the need for castings and welds, thus Aesthetics to the patient reducing treatment time with assertiveness
Mestre
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Nilakantan, Ravishankar. "New power converter topologies for minimizing energy consumption of electronic appliances." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41209.
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The proliferation of electronic equipment that is permanently connected to the grid causes significant parasitic losses. Yet, the design of power supplies for PCs, servers, multi-function printers, etc, is governed by the cost and component specifications at the peak operating point as well as the thermal management of the power supply itself. Most power supplies have lower efficiencies at light loads than at their rated loads. If the unit spends most of its time at the light load operating point, then the energy consumption will be much higher compared to a situation where the power supply is optimized for overall energy consumption with a specified load cycle. Considering that most electronic appliances are produced in high volume, the use of power supplies that permit easy custom design makes sense from the standpoint of energy efficiency. Over the past few years, multiple topological changes and design changes that aim to improve the efficiency of the power supplies have been proposed. However, their proliferation in low cost consumer electronics has been limited primarily by their high costs, additional area overhead and incompatibility with existing power supply converter topologies. As a part of this Master's thesis research work, a business case is first proposed to show that a market for low cost and high power rating electronic devices that exhibits high power efficiency exists. Then a novel yet simple, low cost device(SSSR) is proposed to improve the efficiency of existing power supplies without effecting major changes to their existing design. Our claims are backed up by simulation results and a working prototype. Finally, a ROI model is presented to showcase the effectiveness of the proposed solution in today's consumer market.
10
Arrese, Carrasquer Javier. "Development and optimization of inkjet printing based technologies for hybrid printed circuit boards." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667782.
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The main goal of this doctoral thesis is the development and optimization of inkjet- based technologies for hybrid electronic circuits manufacturing, as well contribute on the development of the incoming low cost electronics. Regarding that, a novel solution for connecting regular SMDs and standard silicon SMD packages by inkjet printing is proposed. The novel connecting method allows the assembling at very low temperatures, and thus assures the compatibility with the incoming substrates. Electrical contact resistance and shear strength measurements performed by silver nanoparticle- based ink are comparable to benchmark connecting materials. In sum up, flexible hybrid circuit is successfully manufactured by silver nanoparticle-based ink on paper, where different SMDs size-shaped are assembled demonstrating the reliability and feasibility of the proposed method.
Another objective of the work is to apply and adapt the print-on-slope technique to assemble directly the silicon dies on PCB, proposing a novel strategy to overcome the drawbacks of the wire bonding in the Conductive AFM measurements. Then, a novel setup for conductive AFM mode 2D materials characterization was manufactured. The 2D connection on ramp-shape terminations gives a better functionality than current wire bonding connections. The AFM tip moves over the silicon die without physical obstruction, giving a unique solution at this novel method to characterize the material degradation.
In the field of multilayer hybrid PCB manufacturing, the goal is to prove the potentiality of different metal-insulator-metal structures inkjet-printed and evaluate their reliability and the electrical performance for low cost multilayer circuit based on paper substrate. In the light of the results, heterogeneous structures combining inorganic and organic dielectric material, where PVP fills the inorganic cracks and voids, possess a similar and outstanding feasibility in both paper and glass substrate without short-circuits.
The greatest achievement of this work is the development and optimization of a novel capillarity-assisted SMD assembling method for the manufacturing of hybrid circuits inkjet-printed. In addition, taking advantage of print-on-slope technique, direct assembling of silicon die integrated circuits to PCB is successfully applied. Moreover, heterogeneous structures inkjet-printed open new solutions for multilayer hybrid circuits.L’objectiu principal d’aquesta tesi doctoral és el desenvolupament i l’optimització de tecnologies basades en injecció de tinta per a la fabricació de circuits electrònics híbrids, així com contribuir al desenvolupament de l’electrònica de baix cost. Es proposa una nova solució per connectar els dispositius de muntatge superficial (SMDs) mitjançant impressió de tinta amb càrrega de nanopartícules de plata. El nou mètode de soldadura permet fer la connexió a temperatures molt baixes i, per tant, assegura la compatibilitat amb els substrats tèrmicament menys resistents. Les mesures elèctriques de resistència de contacte i les mesures mecàniques de resistència de cisalla obtingudes són comparables a als obtinguts amb materials de connexió convencionals. En definitiva, s’ha aconseguit fabricar circuits hídrids flexibles amb èxit mitjançant tinta basada en nanopartícules de plata sobre paper, on diferents dimensions de SMDs han estat soldats, la qual cosa demostra la fiabilitat i la viabilitat del mètode proposat. Un altre dels objectius del treball és aplicar i adaptar la tècnica d'impressió mitjançant rampes per muntar directament microelectrònica sobre circuits impresos. Mitjançant aquesta tècnica, s’han superat els inconvenients provocats per les unions de fil d’or al realitzar mesures conductives mitjançant AFM. Així, s’ha utilitzat una nova estratègia per a la caracterització de materials 2D mitjançant la tècnica de CAFM. Les connexions 2D proporcionen una millor funcionalitat que les connexions actuals mitjançant fils. De fet, la punta AFM es mou sobre la mostra de silici sense obstrucció física, donant una solució única en aquest mètode per caracteritzar la degradació del material. En el camp de la fabricació de PCB híbrida multicapa, l'objectiu és provar la potencialitat de diferents estructures metall-aïllant-metall impreses mitjançant inkjet i avaluar la seva fiabilitat i les propietats elèctriques per a un circuit multicapa de baix cost basat en substrat de paper. A la vista dels resultats, les estructures heterogènies que combinen material dielèctric inorgànic i orgànic, on el PVP omple les esquerdes i els buits de les capes de material inorgànic, presenten unes bones prestacions elèctriques i tenen una viabilitat similar tant en paper com en substrat de vidre sense curtcircuits. La fita més rellevant d’aquest treball és el desenvolupament i l’optimització d’un nou mètode de soldadura de SMDs mitjançant inkjet i assistit per capil·laritat. Aprofitant la tècnica d'impressió sobre rampes, s’ha aconseguit muntar directament circuits integrats de silici sobre PCBs. A més, les estructures heterogènies impreses per injecció de tinta obren noves solucions per a circuits híbrids multicapa.
11
Badea, Costescu Anca. "Contributions à l'analyse numérique des problèmes liés au comportement des fluides dans les imprimantes à jet d'encre." Saint-Etienne, 1995. http://www.theses.fr/1995STET4004.
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Cette étude porte sur deux problèmes issus du processus de fabrication des imprimantes à jet d'encre. Dans le cadre du premier problème, on s'est intéressé à l'étude de l'évolution d'une interface de deux fluides sous l'influence uniquement des forces de capillarité. Un théorème d'existence et d'unicité globale en temps pour des données initiales petites est présenté. Le deuxième problème porte sur la modélisation du comportement d'un fluide contenu dans une enceinte soumise à des vibrations et comportant de petits orifices alignés. En utilisant un développement asymptotique en puissance de la plus petite dimension de l'enceinte et incluant les termes de couche-limite, on obtient la convergence de la solution du problème tridimensionnel, ainsi que la convergence de la solution du problème homogénéisé tridimensionnel vers la solution d'un même problème bidimensionnel. Des problèmes de contrôle frontière sont présentés. Une série de simulations numériques sert à illustrer les résultats théoriques précédents. Une autre série permet de comparer les résultats théoriques aux résultats expérimentaux
12
林依民 and Yi-min Lin. "Computer recognition of printed Chinese characters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1990. http://hub.hku.hk/bib/B31209919.
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施雷 and Lui Sze. "Computer recognition of printed Chinese characters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31213601.
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Agbayani, Lawrence. "Inkquire : National Large Format Printer's Association /." View abstract, 1999. http://library.ctstateu.edu/ccsu%5Ftheses/1556.html.
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Thesis (M.S.)--Central Connecticut State University, 1999.Thesis advisor: Sue Vial. " ... in partial fulfillment of the requirements for the degree of Master of Science in Art." Includes bibliographical references (leaf 8 in. booklet).
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Stefani, Mario Antonio. "Proposta de linguagem geradora de imagens em impressoras de página." Universidade de São Paulo, 1990. http://www.teses.usp.br/teses/disponiveis/54/54132/tde-15052009-114750/.
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Uma compacta linguagem descritora de páginas, destinada a impressoras não-impacto de estrutura raster é apresentada. Tal linguagem foi implementada usando o processador gráfico TMS4010, da Texas Instruments e possui uma estrutura muito similar à encontrada nas linguagens interpretativas encadeadas. A linguagem é totalmente modular e interativa, e se utiliza um modelo gráfico simples, visando simular as tarefas normalmente encontradas nas artes tipográficas. São efetuadas comparações com outras linguagens comerciais, visando avaliar suas possibilidades. Uma pequena introdução à tecnologia das impressoras laser é apresentada.A small Page description language intended for raster non-impact printers is presented. The language is implemented using the Texas Instruments TMS4010 Graphics system processor and its structure is similar that encountered in threaded interpretative languages. The language is fully modular and interactive, and uses a simple graphic model to simulate the same common tasks encoutered in typographical arts. Comparison are made with other comercial languages to perform some evaluations on its possibilities. A small introduction on the laser printer technology is presented.
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Garland, Katherine Jane. "Cognitive differences for learning from computer-based and printed material." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364873.
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Frazier, Prentice. "Utilization of Printer Resources Within a Computer Graphics Department: A Print Queue Analysis." VCU Scholars Compass, 1999. http://scholarscompass.vcu.edu/etd/4545.
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This paper examines print queue management for the graphics department of a financial services company. The current network configuration has proven to be sub-optimal. The IT department is currently undergoing testing of possible alternative network configurations. The objective is to improve performance by leveraging existing resources with new technology. In this paper, the effect of consolidating the queue into one primary queue manager is analyzed, along with prioritizing print jobs, and forecasting future printer needs. Analysis was performed using queuing theory concepts along with an analysis of both steady state and transient behavior using simulation modeling.
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Paul, Gordon. "Screen printed textile based wearable biopotential monitoring." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/374177/.
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This thesis describes the development of printed wearable electrode networks on textiles for monitoring human biopotentials from the skin surface. The aim was to fabricate garments to monitor human biopotentials, such as an electrocardiogram (ECG), on a long term basis. A literature review was carried out to examine fabrication methods for wearable electrode networks on textile and screen printing is selected for this work. Several conductive and insulating screen printable pastes were then evaluated for this application and suitable pastes were selected. Screen printing was used to create networks of conductive tracks on the surface of woven textiles. These networks connect electrodes at different sites to electronics at a central location. The conductive tracks are composed of a silver polymer layer with thickness 5-10μm entirely encapsulated in polyurethane. The durability of these printed conductive tracks is investigated with cyclic stress and washing machine tests. A significant improvement in the durability of these tracks is achieved by using two different polyurethane pastes and optimising the screen printed layer structure. Tracks that can reliably endure 10 typical domestic machine washes without breaking are demonstrated. Carbon loaded silicone rubber is stencil printed to form electrodes on exposed conductive pads at the terminations of screen printed conductive tracks. The carbon loaded rubber formulation is optimised to provide electrodes with low resistivity, low surface energy and high flexibility. By using stencil printing rather than screen printing, the thickness of the electrodes is increased, causing them to protrude from the textile surface, which is useful in ensuring stable electrode-skin contact. Passive and active electrodes are fabricated on woven textiles using screen and stencil printing, and their performance is evaluated. The passive electrodes have issues with DC instability, but have suitable performance for some electromyography tasks and basic heart rate monitoring. The active electrodes show comparable performance with the gold standard, commercial Ag/AgCl electrodes. The printed textile electrode networks are demonstrated in four applications: a one-lead bipolar heart monitoring belt, a Frank configuration vector-cardiogram monitoring vest, a headband as an electromyographic (EMG) and electrooculographic (EOG) computer interface, and an armband used to examine electromyographic activity in the upper arm. Screen printing on textiles is shown to be a low-cost alternative fabrication process for durable wearable electrode networks on textiles, capable of providing high signal quality. These printed textile electrode networks are shown to be applicable to ambulatory monitoring, to reduce the associated cost and discomfort, and in hospitals and research to reduce electrode setup time.
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Briggs, Amanda. "A study of photographic images, processes and computer aided textile design." Thesis, Nottingham Trent University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388871.
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Sheffield, Randolph Joseph. "Infrared measurement and analytical prediction of the transient temperature distribution on computer boards." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/17897.
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Dong, Chen-Koung. "Measurement of printer parameters for model-based halftoning." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12812.
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Ezell, Novice M. J. (Novice Marie Johnson) 1976. "Analysis of memory usage in a LaserJet printer." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80062.
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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.Includes bibliographical references (leaf 56).
by Novice M.J. Ezell.
S.B.and M.Eng.
23
Murarka, Apoorva. "Contact-printed microelectromechanical systems." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77080.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 105-107).
Microelectromechanical systems (MEMS) are ubiquitous. Scalable large-area arrays of MEMS on a variety of substrates, including flexible substrates, have many potential applications. Novel methods for additive fabrication of thin (125±15 nm thick) suspended gold membranes on a variety of rigid and flexible cavity-patterned substrates for MEMS applications are reported. The deflection of these membranes, suspended over cavities in a dielectric layer atop a conducting electrode, can be used to produce sounds or monitor pressure. The reported fabrication methods employ contact-printing, and avoid fabrication of MEMS diaphragms via wet or deep reactive-ion etching, which in turn removes the need for etch-stops and wafer bonding. Elevated temperature processing is also avoided to enable MEMS fabrication on flexible polymeric substrates. Thin films up to 12.5 mm2 in area are fabricated. The MEMS devices are electrically actuated and the resulting membrane deflection is characterized using optical interferometry. Preliminary sound production is demonstrated, and further applications of this technology are discussed.
by Apoorva Murarka.
M.Eng.
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Crook, Edward D. "Linking Printed Books to Computerized Speech." NSUWorks, 1999. http://nsuworks.nova.edu/gscis_etd/470.
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Adult students who experience difficulties in comprehending written (printed) language frequently are limited in their scholastic development and possible employment opportunities. These individuals, who represent a growing segment of the learning disabled population, include poor readers and dyslexics and they routinely seek help and remediation through various educational techniques. One remediation technique often used is "books on tape". Through books on tape, recorded spoken text is presented in a sequential manner to the remedial reader as he or she is reading the corresponding printed document. This dissertation reviewed the books on tape paradigm, and through the use of current computer technology and random access storage, created an interface to enable the remedial reader to correlate a relative position on a printed page to the corresponding, pre-recorded spoken text presented by the computer.
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Harb, Ihab A. "An approach to pattern recognition of multifont printed alphabet using conceptual graph theory and neural networks." PDXScholar, 1989. https://pdxscholar.library.pdx.edu/open_access_etds/3923.
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This thesis describes an approach for accomplishing a pattern recognition task using conceptual graph theory and neural networks (NNs). The set of patterns to be recognized are the capital letters of six different fonts of the English alphabet, plus two shifted and six rotated versions of each. The letters are represented to the neural network on a 16x16 input grid (256 "sensor lines"). A standard classification encoding for such patterns is to use a 26-bit vector (26 lines at the NN's output), one bit corresponding to each letter. Experiments with such an encoding yielded results with poor generalization capability. A new encoding scheme was developed, based on the conceptual graph formalism. This entailed designing a set of concepts and a set of associated relations appropriate to the upper case letters of the English alphabet. From these, the following were developed: a conceptual graph representation for each letter, a connection matrix for each, and finally, a C-vector and an R-vector representation for each. The latter were used as the output encoding (21 bits) of the NN pattern recognizer. A feed-forward neural network with 256 inputs, 21 outputs, and 2 hidden layers was trained using the back-propagation- of-error algorithm. Results were significantly better than with the more standard. encoding. Generalization on fonts improved from 74% to 96%, generalization on rotations improved from 83% to 94%, and finally, generalization on shifts improved from 2% to 93%.
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Gill, Gary W. (Gary William). "Tektronix solid ink printer print head drive board cost reduction project." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/45493.
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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.In title, the abbreviation for "Trade Mark" appears after the work Tektronix on t.p.
Includes bibliographical references (leaf 105).
by Gary W. Gill.
S.B.and M.Eng.
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Sae-Tang, Sutat. "A systematic study of offline recognition of Thai printed and handwritten characters." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/206079/.
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Thai characters pose some unique problems, which differ from English and other oriental scripts. The structure of Thai characters consists of small loops combined with curves and there is an absence of spaces between each word and sentence. In each line, moreover, Thai characters can be composed on four levels, depending on the type of character being written. This research focuses on OCR for the Thai language: printed and offline handwritten character recognition. An attempt to overcome the problems by simple but effective methods is the main consideration. A printed OCR developed by the National Electronics and Computer Technology Center (NECTEC) uses Kohonen self- organising maps (SOMs) for rough classification and back-propagation neural networks for fine classification. An evaluation of the NECTEC OCR is performed on a printed dataset that contains over 0.6 million tokens. Comparisons of the classifier, with and without the aspect ratio, and with and without SOMs, yield small, but statistically significant differences in recognition rate. A very straightforward classifier, the nearest neighbour, was examined to evaluate overall recognition performance and to compare with the classifier. It shows a significant improvement in recognition rate (about 98%) over the NECTEC classifier (about 96%) on both the original and distorted data (rotated and noisy), but at the expense of longer recognition times. For offline handwritten character recognition, three different classifiers are evaluated on three different datasets that contain, on average, approximately 10,000 tokens each. The neural network and HMMs are more effective and give higher recognition rates than the nearest neighbour classifier on three datasets. The best result obtained from the HMMs is 91.1% on ThaiCAM dataset. However, when evaluated on a different dataset, the recognition rates drastically reduce, due to differences in many aspects of online and offline handwritten data. An improvement in classification rates was obtained by adjusting the stroke width of a character in the online handwritten dataset (12 percentage points) and combining the training sets from the three datasets (7.6 percentage points). A boosting algorithm called AdaBoost yields a slight improvement in recognition rate (1.2 percentage points) over the original classifiers (without applying the AdaBoost algorithm).
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Grassia, Paul. "Computer simulations of polymer Brownian motion : (with an additional section) The design of an ink jet printer." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319900.
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Moscicki, Angelique (Angelique E. ). "ChemWARD : extracting chemical structure from printed diagrams." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/61299.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 117-118).
Over the years, a vast amount of literature in the field of chemistry has accumulated, and searching for documents about specific molecules is a formidable task. To the extent that the literature is textual, services like Google enable relatively easy search. While search indexes like Google are very good at finding such things, its difficult to describe molecules completely using text because text can't easily indicate molecular structure, and molecular structure defines chemical properties. ChemWARD is a system that extracts the molecular structure from the printed diagrams that are ubiquitous in chemistry literature and converts them to a machine readable format in order to allow chemists to search the literature by drawing a molecular structure instead of typing a chemical formula. We describe the architecture of the system and report on its performance, demonstrating its ability to achieve an overall accuracy rate of 85.5% on printed diagrams extracted from published chemical literature.
by Angelique Moscicki.
M.Eng.
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Turner, Chrisopther T. (Christopher Thomas). "Flat panel display driers with printed elements." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10173.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.Includes bibliographical references (leaves 51-52).
by Christopher T. Turner.
M.Eng.
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Li, Yi. "Direct write printed flexible electronic devices on fabrics." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/363098/.
Full textAbstract:
This thesis describes direct write printing methods to achieve flexible electronic devices on fabrics by investigating, low temperature process; and functional conductor, insulator and semiconductor inks. The objective is to print flexible electronic devices onto fabrics solely by inkjet printing or pneumatic dispenser printing. Antennas and capacitors, as intermediate inkjet printed electronic devices, are addressed before transistor fabrication. There are many publications that report inkjet printed flexible electronic devices. However, none of the reported methods use fabrics as the target substrate or are processed under a sufficiently low temperature (≤150 oC) to enable fabrics to survive. The target substrate in this research, standard 65/35 polyester cotton fabric, has a maximum thermal curing condition of 180 oC for 15 minutes and 150 oC for 45 minutes. Therefore the total effective curing time is best below 150 oC within 30 minutes to minimise any potential degradation of the fabric substrate. This thesis reports on an inkjet printed flexible half wavelength fabric dipole antenna, an inkjet printed fabric patch antenna, an all inkjet printed SU-8 capacitor, an all inkjet printed fabric capacitor and an inkjet printed transistor on a silicon dioxide coated silicon wafer. The measured fabric dipole antenna peak operating frequency is 1.897 GHz with 74.1 % efficiency and 3.6 dBi gain. The measured fabric patch antenna peak operating frequency is around 2.48 GHz with efficiency up to 57 % and 5.09 dBi gain. The measured capacitance of the printed capacitor is 48.5 pF (2.47 pF/mm2) at 100 Hz using the inkjet printed SU-8. The capacitance of an all inkjet printed flexible fabric capacitor is 163 pF (23.1 pF/mm2) at 100Hz with the UV curable PVP dielectric ink developed as part of this work.
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Kwan, Joyce G. "Design of electronics for a high-resolution, multi-material, and modular 3D printer." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85435.
Full textAbstract:
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 66-68).
Electronics for a high-resolution, multi-material, and modular 3D printer were designed and implemented. The driver for a piezoelectric inkjet print head can fire its nozzles with one of three droplet sizes ranging from 6 pL to 26 pL at approximately 10 kHz. The system developed for curing photopolymer materials is low-power, low-cost, and safe, using ultraviolet light-emitting diodes instead of a gas-discharge lamp. Fabrication cost is less than $10,000, but the printer's 600 DPI resolution is comparable to that of industrial 3D printers. Printed objects exhibit detailed features and a gradual transition between materials with different mechanical properties. The printer's modular design allows modification of the printer to employ different fabrication technologies.
by Joyce G. Kwan.
M. Eng.
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Naughton, Cassian. "Costs of complexity in Hewlett-Packard's inkjet printer business." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39690.
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Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; in conjunction with the Leaders for Manufacturing Program at MIT, 2007.Includes bibliographical references (p. 50).
This thesis deals with the cost of complexity at Hewlett-Packard's inkjet printer business. The term cost of complexity refers to the costs associated with offering a more diverse portfolio. The most basic example is to consider the situation of increasing the number of items for sale from one to two. As the second item is added setup costs will be incurred since there will now be changeovers from the production of one item to the other. If there are unique components in the added product then there will be additional suppliers to be managed etc. As more and more products are added in search of additional revenue the cost of complexity can rise dramatically. Eventually the costs associated with offering the additional end items can outweigh the incremental revenue earned. While it is easy to measure the revenue from these peripheral offerings it is difficult to determine the associated costs. This combination means that the number of end items offered can grow unabated. In this thesis we examine a framework for analyzing the trade-off between the costs and benefits of offering increased variety.
by Cassian Naughton.
S.M.
M.B.A.
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Kadari, Kishore Kumar. "Electroplating on 3D Printed Conductive Track." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7412.
Full textAbstract:
There are substantial advances in Additive Manufacturing (AM) technologies. The simplest and advantageous technique of AM in terms of cost and scaling of the substrate is Fused Deposition Modeling(FDM). Currently, integration of electronics to a 3D printed structure is done manually after fabrication of the structure. To print electronic circuits directly on a 3D printed structure, copper electroplating process has been studied in this work.
To electroplate on the 3D printed insulating substrate, various materials were studied to make substrate conductive. By using conductive Polylactic Acid (PLA) filaments, a compatible substrate for electroplating was printed. Electroplating was proved to be advantageous in terms of uniform distribution as well as fast deposition rate when performed laterally. The conductive levels of the electrodeposited layers on 3D printed conductive substrates were studied at different voltages in different configurations.
Furthermore, the textures of the electroplated layer were studied using Scanning Electron Microscopy(SEM) method. The resistance of samples was measured using four-point probe resistance setup. The Morphology and roughness of the samples were studied by an optical profilometer system.
In addition, the adhesion strength of the electrodeposited copper on conductive PLA material was tested by a peel test using scotch tape. Thickness and conductivity calculations were performed for uniformly deposited samples. Further study is required for optimizing electroplating process to be used for in situ metallizations of a 3D printed structure.
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Law, Hang-Wai. "Knowledge-based computer-aided process planning system for the manufacture of bare printed circuit board." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/27414.
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This thesis focuses on the use of a knowledge-based computer aided system for the task of bare printed circuit board (PCB) process planning. To achieve this task, a knowledge-based computer system has been developed in which process plans can be generated automatically. The planning decisions are based on board requirements, customer general specifications and product quality standards.
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Pink, Jeffrey R. "Features and neural net recognition strategies for hand printed digits /." Online version of thesis, 1995. http://hdl.handle.net/1850/12230.
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Brandt, David E. "Building 3D-Printed Widgets to Incorporate into Prototypes." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5625.
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Creating interactive prototypes can be a long and difficult process. It requires expertise in various fields. Prior work in developing interactive prototypes minimize time required to make a prototype, but generally sacrifice fidelity for fluidity. Advances in 3D printing create new opportunities to prototype with greater fidelity and fluidity. We investigate the use of several kinds of sensors, including IR photo interrupters, IR photo reflectors, push button switches, and potentiometers, to create interactive prototypes. We first design a library of 3D printable interaction components, buttons, sliders, and knobs using those sensors then we develop software to transform interaction events into events in computer programs. The combinations of interaction components and sensing devices are evaluated based on their durability and ability to be printed into prototypes and used as human-computer interface devices.
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Hall, Richard C., and Doris I. Wu. "ANALYSIS AND DESIGN OF CONFORMAL PRINTED ANTENNAS." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/608419.
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International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, NevadaConformal printed antennas of arbitrary shape are used for telemetry applications on high velocity vehicles due to their small size and light weight. The design of these antennas is difficult, however, since there are few accurate analytical models that take the effects of curvature into account. This paper discusses a computer aided design (CAD) tool for arbitrarily shaped printed antennas on cylindrical structures based on a rigorous analytical model. The tool is combined with a graphical user interface and can help antenna designers achieve close to optimal performance. An overview of the mathematical model is given here and the CAD tool is used to highlight the effects of curvature on printed antenna performance. Methods of obtaining circular polarization are reviewed.
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Hickam, James William III 1956. "Paperless planning in printed circuit board manufacturing." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277250.
Full textAbstract:
One of the aspects of Computer Integrated Manufacturing is the ability to provide current work instructions to the operator at their workstation on a terminal or graphic monitor. The problem is, today, paperless planning is displayed to the operator one page at a time, making the operator report the completion or not completion of that task before showing the next page. This allows the operator no freedom of choice in how to do the job, which leads to reduced productivity and quality. A possible solution is presented by structuring the planning instructions and enhancing the workstation. The operator can be allowed to do the work the way he or she feels the most comfortable and yet, ensure the work is done according to design requirements.
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Chang, Christopher Isaac. "Real-time hand printed character recognition on a DSP chip." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37770.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.Includes bibliographical references (p. 119-120).
by Christopher Isaac Chang.
M.S.
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Sarathy, Vasanth. "Physical modeling of electrical conduction in printed circuit board insulation." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34357.
Full textAbstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.Includes bibliographical references (p. 297-301).
This thesis is concerned with understanding the degradation of electrical and electronic components in automobiles due to environmental effects. A special emphasis is placed on understanding the physical processes underlying the degradation, so that accelerated reliability tests can be specified with increased confidence of their validity. As a first case,printed circuit board (PCB) insulation was selected as a target for investigation. With an increase in the electronics and circuit miniaturization coupled with an increase in voltage in 42 volt as well as hybrid vehicles, PCB reliability has become an important issue. We first provide a broad presentation of insulation degradation theory as well as electrical conduction theory according to existing literature and then narrow our focus towards printed circuit board insulation. We develop a novel first-order mathematical model to describe electrical currents in printed circuit board insulation as a function of temperature, relative humidity, absorbed moisture content, voltage and geometrical characteristics. This model was developed from a series of experiments that were carefully performed under controlled laboratory conditions. In addition to describing the experimental procedure and results, we also explain the details of the experimental setup and measurement instrumentation. Furthermore, we present an intuitive physical explanations for some observations and model responses.
by Vasanth Sarathy.
S.M.
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Ong, Chris Kevin G. "Design and implementation of an interactive 3D printed MIT tangible map." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/117321.
Full textAbstract:
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 23-25).
The Tangible Map is an interactive 3D printed MIT map (Tangible Map) that will be exhibited in the MIT Atlas Welcome Center. The Tangible Map will allow users to select buildings by touching them or search by building name, department, or faculty name on an iPad interface. The main goal of the project is to provide better access to knowledge and information about MIT life and the MIT campus to for both visitors and the MIT community. The system consists of a web app and a native iPad app, both of which connect to an Node.js server to communicate commands and retrieve data. The web app is displayed across two large touch-sensitive displays, and the printed buildings are positioned on top of the displays. Extensive software testing and user testing was done in order to ensure the robustness of the system and the effectiveness of the user interface.
by Chris Kevin G. Ong.
M. Eng.
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Moissis, Elias D. (Elias Daniel). "A description and simulation of a printed-circuit board manufacturing plant." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14593.
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Orman, PTF. "Design and development of an interface board between a minicomputer and a CDC printer with a memory buffer and a programmable vertical format throw." Thesis, Cape Technikon, 1988. http://hdl.handle.net/20.500.11838/1124.
Full textAbstract:
Thesis (Masters Diploma (Technology)-- Cape Technikon, Cape Town,1988Brown Davis and McCorquodale is one of the major suppliers of cheques to the banking industry. To produce these cheques they use a number of different print systems, one of which comprises of a minicomputer, an industry standard tape deck and two printers, a Diablo daisywheel and a Control Data Corporation (CDC) printer which was extensively modified to cater for the requirements of the cheque printing industry. The CDC printer is used to print the code line on the cheques using magnetic ink. After each line is printed the computer sends a form feed command which causes the printer to throw paper. This throw is controlled by a paper tape, known as a Vertical Format Unit tape, or rather a VFU tape. This tape has holes punched into it at specific places which determine the amount of paper throw also known as vertical feed. The holes are sensed by brushes which are pulled up to 5 volt when they pass over a hole and touch a roller connected to the 5 volt line. This system, being of an electro-mechanical nature, is prone to faults and causes much down time due to mechanical wear on the brushes and dirt on the roller. This means that the brushes have to be adjusted and therefore also means that the timing has to be readjusted each time. The timing relationships are discussed in Section 2.B
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Arellano, Jesus A. "Inkjet-Printed Highly Transparent Solar Cell Antennas." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/1083.
Full textAbstract:
Small satellites, especially Cube Satellites (CubeSats), have become important vehicles for space exploration. One of the challenges CubeSats face is limited surface area. This limitation poses a question for antenna design–where to mount the antenna? This thesis presents a study where the antennas are directly integrated on top of solar cells. In order to achieve such integration, the antennas have to be highly transparent to light. This thesis aims at the transparency of 95%. Methods to effectively generate transparent antenna by using inkjet printing are discussed in detail and interaction between solar cells and antennas have been assessed and presented. It is found that the presence of solar cells cast a degree of gain reduction of the antenna, but such a loss may be improved with a more precise integration and by increasing the operational frequency. The effect of the antenna on solar cell performance is concluded to be less than 3%, promising a feasibility of implementing highly transparent antennas on CubeSats.
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葉賜權 and Chee-kuen Yip. "Machine recognition of multi-font printed Chinese Characters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1990. http://hub.hku.hk/bib/B31210120.
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Choi, Kin-kwan. "Recognition of printed Chinese characters using a neural network /." [Hong Kong : University of Hong Kong], 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13166578.
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Protogeros, Adrianos. "A distributed control system for printed circuit manufacture using a local area network." Thesis, University of Salford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293822.
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Tursunniyaz, Muhammadeziz. "Conformal Inkjet Printed Antennas for Small Spacecraft." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7161.
Full textAbstract:
Although small spacecraft are small in size and light in weight compared to the conventional satellites, they can offer lots of possibilities for space exploration, scientific observation, data collection and telecommunication. Also, they cost a lot less money than the conventional satellites, and the scientific missions can be planned in a relatively short period of time by using the COTS (Commercial Off-The-Shelf) materials. However, there is a big challenge for the small spacecraft that is the limited surface area of the small spacecraft and the outnumbered components to be mounted on the surface of the small spacecraft. The most obvious one is that the competition for the limited real estate between the antenna and solar cells.
UAVs, also known as drones, have become so popular that it is not only used for military and scientific applications, but also they are available for recreational use for ordinary people. Although they are getting smaller in size so that one can put them in his pocket or on his palm, they are becoming multifunctional, which requires more sensors to be mounted on the surface of the drone to achieve its multifunctionality. For example, a recreational drone can not only take pictures and videos, but also it can transmit the picture or video in real time to the operator, which needs a camera to take the picture or videos and needs an antenna to transmit the recorded data to the operator. This requires that the limited surface area needs to be efficiently used in order to accommodate the multiple needed components. This thesis presented a faster, better and cheaper way of inkjet printing conformal antennas on the cover glass of the solar cells of the small spacecraft or on the wing or other parts of the UAV body to integrate the antenna with the solar panels of the CubeSats or with or directly printing the antenna on the UAV body to efficiently use the limited real estate. Several meshed and solid patch antennas printed on a space certified AF32 glass substrate using the printing procedure outlined in this thesis and measured to verify the effectiveness of the inkjet printing procedures. A high gain reflectarray with optical transparency of 95% was inkjet printed on space certified AF32 glass and BOROFLOAT glass and measured to verify the antenna performance and solar panel efficiency. Measurement results showed that the inkjet printed reflectarray integrated on top of the solar panel has a gain of 21.5 dB. The solar panel efficiency was dropped by around 6% due to the inkjet printed reflectarray on glass.
A simple conformal dual-band antenna for UAV application was designed with ANSYS HFSS and fabricated in the lab using a foam substrate. The measured antenna performances agreed well with the simulation results. This dual-band antenna also can be inkjet printed directly on the wing or other parts of the UAVs using the printing techniques discussed in this thesis.
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Vardanyan, Konstantin. "A Low Cost Time Domain Reflectometry Circuit for printed Electronic Applications." Thesis, KTH, Material- och nanofysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-143197.
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