To see the other types of publications on this topic, follow the link: Digital raid.
Dissertations / Theses on the topic 'Digital raid'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Digital raid.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Kayes, Edwin. "A NEW GENERATION OF DATA RECORDERS FOR REMOTE SENSING GROUND STATIONS." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/608543.
Full textAbstract:
International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, NevadaMagnetic tape is the primary medium used to capture and store unprocessed data from remote sensing satellites. Recent advances in digital cassette recording technology have resulted in the introduction of a range of data recorders which are equally at home working alongside conventional recorders or as part of more advanced data capture strategies. This paper shows how users are taking advantage of the convenience, economy and efficiency of this new generation of cassette-based equipment in a range of practical applications.
2
Nystrom, Ingemar, and Tim Gatton. "RANGE UPGRADE FOR DATA RECORDING AND REPRODUCTION." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/608296.
Full textAbstract:
International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, CaliforniaFlexible data multiplexing that supports both low-speed (4 Mbps) to very high-speed output devices (networks and recording systems up to 480 Mbps), along with data network formatting, can greatly enhance the results of range upgrading.
3
Berard, Al, Chris Nixon, and Michael Lockard. "NOW IS THE RIGHT TIME FOR SOLID STATE." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606756.
Full textAbstract:
International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, CaliforniaFor the last 30 years Magnetic Tape Systems have been the primary means of recording data from airborne instrumentation systems. Increasing data rates and harsh environmental requirements have often exceeded the ability of tape-based systems to keep pace with technology. Throughout this time data recordings have been made mostly with analog longitudinal systems and most recently with digital recording systems that record on commercial DLT, and super VHS tape media. The recordings are played back with the same type of tape device allowing for the data to be processed and/or archived. Since not all data reduction facilities can process the same type of tape media, often tapes are dubbed from one type of tape media format to another, corrupting the translated data. This paper examines operational and data reduction benefits, and life cycle cost of Solid State Recorders as a replacement for existing airborne tape recorders.
4
Van, der Merwe Willem Johannes. "Rapid 3D measurement using digital video cameras." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/915.
Full text
5
Chan, Na-Han. "Rapid current analysis for CMOS digital circuits." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26380.
Full textAbstract:
A versatile and efficient computer-aided analysis tool, CUREST, has been developed for the analysis of supply currents in CMOS digital circuits. It is based on Nabavi-Lishi's semi-analytical model for computing the current and delay in a CMOS logic gate which, when compared to HSPICE running the level-3 MOSFET model, is more than three orders of magnitude faster, and accurate to within 10%. CUREST is built on top of the timing analyser TAMIA and, in particular, uses its circuit parser and its data structure to store the circuit topology and primary input pattern.Extension tests on benchmark circuits containing up to 555 gates, which were analysed with CUREST using thousands of primary input patterns, demonstrate that the current analysis time is in the range of 1ms per gate per input pattern, using a SUN4/490 workstation with 32 Mb of main memory, running the SUN OS 4.103 operating system. The peak value of the total supply current, the current rise-time, and the time at which the peak occurs are usually computed to within 10% of HSPICE. However, appreciable errors often occur in the average current. This is because at the moment we do not have a good model for dealing with incomplete transitions associated with glitches in a CMOS gate.
6
Chen, Tian Lan. "Thermal digital microfluidic devices for rapid DNA analysis." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691869.
Full text
7
Ghassaei, Amanda Paige. "Rapid design and simulation of functional digital materials." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107567.
Full textAbstract:
Thesis: S.M., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2016.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 113-118).
Digital fabrication aims to bring the programmability of the digital world into the physical world and has the potential to radically transform the way we make things. We are are developing a novel digital fabrication technique where a small basis set of discrete part types, called "digital materials", are reversibly joined into large assemblies with embedded functionality. Objects constructed this way may be programmed with exotic functional behavior based on the composition of their constituent parts. In this thesis I build an end-to end computer-aided design (CAD), simulation, and manufacturing (CAM) pipeline for digital materials that respects the discretization of the parts in its underlying software representation. I propagate the same abstract geometric "cell" representation of parts from the design workflow into simulation and path planning. I develop a dynamic model for simulating anisotropic, multimaterial assemblies of cells with embedded mechanical and electronic functionality based on local interactions. I demonstrate the similarities between my mechanical model and the Timoshenko Beam Element. I note an advantage of my model for simulating flexural joints is its non-linear treatment of angular displacements - allowing for large angular deformations to be simulated without costly remeshing. I implement this model in software and demonstrate its potential for parallelization by calculating each cell-cell interaction in a separate core of the GPU. I compare my simulation results with a professional multiphysics software package. I demonstrate that my tool facilitates rapid exploration of the design space around functional digital materials with several examples.
by Amanda Paige Ghassaei.
S.M.
8
Haxhani, Adelina, and Sara Khasrro. "Rapid Digital Transformations Of SMEs: A Conceptual Model." Thesis, Högskolan i Halmstad, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-44720.
Full textAbstract:
This study introduces the demand for rapid digital transformation in this changing digital era. While all companies face challenges when approaching digital transformations, SMEs are at a disadvantage in regard to their resource constraints. However, the existing academic field lacks in research about rapid digital transformation for SMEs. Therefore, this study aims to answer the research questions “How can SMEs rapidly digitally transform?” and “How is rapid defined in the context of digital transformation?”. The purpose is to understand the process of digital transformation to develop a conceptual framework on how SMEs can undergo a rapid digital transformation. We approached this with an abductive and qualitative method. Semi-structured interviews were performed with Swedish consultants, a CDO and a CEO of a SME. The gathered data was analyzed together with the frame of reference, which was structured into four categories. These are digital transformation, strategy, business model and digital culture. The findings of this study presented the definition for rapid in the context of digital transformation to be a timeframe up to twelve months. Moreover, we constructed a model that guides SMEs to achieve a rapid digital transformation. However, as the model was not tested in practice, we recommend future researchers to do so.
9
Ono, Evelise [UNESP]. "Avaliação de reabsorções radiculares externas por meio de reconstrução digital de imagens e subtração radiográfica digital." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/105869.
Full textAbstract:
Made available in DSpace on 2014-06-11T19:35:10Z (GMT). No. of bitstreams: 0
Previous issue date: 2008-04-22Bitstream added on 2014-06-13T20:46:09Z : No. of bitstreams: 1
ono_e_dr_sjc_prot.pdf: 724673 bytes, checksum: 4e42b923c66c9d34cc50e91707bc9ad8 (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Diante dos prejuízos que a reabsorção severa da raiz pode acarretar, e considerando a técnica de subtração radiográfica digital (SDR) importante recurso para detecção precoce de alterações minerais, propõe-se neste estudo avaliar a eficiência de um programa de computador, que execute o registro das imagens e SRD, no diagnóstico da reabsorção radicular externa simulada, comparado à radiografia digital, além da concordância intra e interexaminadores nos 2 métodos de diagnóstico. Os 49 dentes de mandíbulas humanas maceradas com reabsorções de diferentes dimensões, simuladas na região apical e lingual, foram radiografados com variação de ângulos de projeção. A radiografias foram registradas a posteriori pelo programa Regeemy® e subtraídas pelo programa Image Tool®. A quantidade de ruído estrutural nas imagens subtraídas foi obtida pela mensuração da média e desvio-padrão dos níveis de cinza. Para avaliação do desempenho dos métodos de diagnóstico, pares de radiografias periapicais e imagens subtraídas foram apresentadas a 3 radiologistas. De acordo com os resultados, o ruído das imagens subtraídas de radiografias após variações de 10º e 20º do ângulo vertical e 10º horizontal e corrigidas a posteriori, foi significantemente maior que das imagens subtraídas de radiografias padrão, independente da região radiografada. Não houve diferença estatisticamente significativa entre os métodos na detecção de reabsorções apicais, independentemente do tamanho da lesão, assim como não houve diferença entre os métodos na detecção de reabsorções linguais de 1,2 mm ou mais. A SRD foi significantemente superior à radiografia digital para detecção de lesões linguais de cerca de 1 mm. Cavidades na superfície lingual de cerca de 0,5 mm não foram detectadas com precisão por nenhum dos métodos...
Because of the harm that severe root resorption may cause and considering the digital subtraction technique (DSR) as an important tool for early detection of mineral alterations, the aims on the present study are to assess the efficiency of a computer software for image registration and DSR on the diagnosis of simulated root resorption, to compare their results with those obtained with digital radiographs, and to assess the intra- and inter-examiner agreement using the two methods of diagnosis. Forty nine teeth with simulated lingual and apical root resorptions of varied extension were x-rayed with different projection angles. The radiographs were registered a posteriori with Regeemy® software and subtracted with Image Tool® software. The amount of structural noise of the subtracted images was evaluated by measuring the mean and standard-deviation of their gray levels. The performance of each method of diagnosis was assessed by submitting pairs of periapical radiographs and the subtracted images to the evaluation of three oral radiologists. According to the results, the structural noise of subtracted images from radiographs with variations of 10º and 20º of vertical angle and 10º of horizontal angle was significantly higher than the obtained from the radiographs without angular variation, independently from the anatomic region of the image. There was no statistically significant difference between the methods on the detection of apical root resorptions independently from the size of the lesion as well as no statistically significant difference was found between the methods on the detection of lingual resorptions of 1.2mm or more. DSR was significantly superior to the digital radiographs on the detection of lingual lesions of around 1mm. Lingual lesions of around 0.5mm were not precisely detected by any of the methods. The inter- and intra-examiner agreements were substantial... (Complete abstract, click electronic access below)
10
Ono, Evelise. "Avaliação de reabsorções radiculares externas por meio de reconstrução digital de imagens e subtração radiográfica digital /." São José dos Campos, 2008. http://hdl.handle.net/11449/105869.
Full textAbstract:
Orientador: Edmundo Medici FilhoBanca: Edmundo Medici Filho
Banca: Horacio Faig leite
Banca: Elisa Emi tanaka Carloto
Banca: Sandra Maria Nobre David
Banca: Julio Cezar de Melo Castilho
Resumo: Diante dos prejuízos que a reabsorção severa da raiz pode acarretar, e considerando a técnica de subtração radiográfica digital (SDR) importante recurso para detecção precoce de alterações minerais, propõe-se neste estudo avaliar a eficiência de um programa de computador, que execute o registro das imagens e SRD, no diagnóstico da reabsorção radicular externa simulada, comparado à radiografia digital, além da concordância intra e interexaminadores nos 2 métodos de diagnóstico. Os 49 dentes de mandíbulas humanas maceradas com reabsorções de diferentes dimensões, simuladas na região apical e lingual, foram radiografados com variação de ângulos de projeção. A radiografias foram registradas a posteriori pelo programa Regeemy® e subtraídas pelo programa Image Tool®. A quantidade de ruído estrutural nas imagens subtraídas foi obtida pela mensuração da média e desvio-padrão dos níveis de cinza. Para avaliação do desempenho dos métodos de diagnóstico, pares de radiografias periapicais e imagens subtraídas foram apresentadas a 3 radiologistas. De acordo com os resultados, o ruído das imagens subtraídas de radiografias após variações de 10º e 20º do ângulo vertical e 10º horizontal e corrigidas a posteriori, foi significantemente maior que das imagens subtraídas de radiografias padrão, independente da região radiografada. Não houve diferença estatisticamente significativa entre os métodos na detecção de reabsorções apicais, independentemente do tamanho da lesão, assim como não houve diferença entre os métodos na detecção de reabsorções linguais de 1,2 mm ou mais. A SRD foi significantemente superior à radiografia digital para detecção de lesões linguais de cerca de 1 mm. Cavidades na superfície lingual de cerca de 0,5 mm não foram detectadas com precisão por nenhum dos métodos... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Because of the harm that severe root resorption may cause and considering the digital subtraction technique (DSR) as an important tool for early detection of mineral alterations, the aims on the present study are to assess the efficiency of a computer software for image registration and DSR on the diagnosis of simulated root resorption, to compare their results with those obtained with digital radiographs, and to assess the intra- and inter-examiner agreement using the two methods of diagnosis. Forty nine teeth with simulated lingual and apical root resorptions of varied extension were x-rayed with different projection angles. The radiographs were registered a posteriori with Regeemy® software and subtracted with Image Tool® software. The amount of structural noise of the subtracted images was evaluated by measuring the mean and standard-deviation of their gray levels. The performance of each method of diagnosis was assessed by submitting pairs of periapical radiographs and the subtracted images to the evaluation of three oral radiologists. According to the results, the structural noise of subtracted images from radiographs with variations of 10º and 20º of vertical angle and 10º of horizontal angle was significantly higher than the obtained from the radiographs without angular variation, independently from the anatomic region of the image. There was no statistically significant difference between the methods on the detection of apical root resorptions independently from the size of the lesion as well as no statistically significant difference was found between the methods on the detection of lingual resorptions of 1.2mm or more. DSR was significantly superior to the digital radiographs on the detection of lingual lesions of around 1mm. Lingual lesions of around 0.5mm were not precisely detected by any of the methods. The inter- and intra-examiner agreements were substantial... (Complete abstract, click electronic access below)
Doutor
11
Murran, Miguel Angel. "Rapid prototyping of a programmable controller for digital microfluidic systems." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/41893.
Full textAbstract:
Digital microfluidic (DMF) devices can be used to perform complete chemical or biochemical analysis on miniscule droplets; thus they have the potential to replace large and expensive laboratory facilities. Droplets are manipulated on a DMF device by the application of electrical signals to an array of electrodes. Several droplet operations including transport, mixing, and splitting can be performed by the sequential timing of these electrical signals. However, the reliability and successful operation of a DMF device largely depend on improving its controller hardware and fabrication quality. A closed-loop controller uses feedback information to compensate for modeling and run-time uncertainties; thus the controller can improve the accuracy and robustness of droplet operations on a DMF device.
In this thesis, a low cost and fully-customizable closed-loop controller is prototyped for DMF devices. This controller incorporates a calibration-free droplet position sensing technique capable of estimating the position of any type of droplet anywhere on a DMF device. The controller was simulated to evaluate its feasibility of improving the control of a droplet prior to prototyping. Simulation results demonstrate that unprecedented control over droplet position, velocity, and acceleration can be achieved with the proposed controller. In addition, these simulation observations revealed that pulse train actuation was feasible for controlling the incremental position, velocity, and acceleration of a droplet in a DMF device. Finally, a portable, low-cost closed-loop control system was built using off-the-shelf components. The proposed controller was integrated with a DMF device to experimentally demonstrate its potential of enhancing the control of droplet transport operations by sub-electrode droplet positioning. The prototyped controller can monitor and control the position of a droplet in real-time with an unparalleled degree of accuracy and repeatability. A final contribution was to optimize the fabrication process for a defect-free DMF device using basic microfabrication.
The outcome of this research will allow for complete control over the droplet transport operation. This controller can also be used for more complex droplet operations including mixing and splitting droplets in DMF devices. In addition, the proposed closed-loop controller hardware can serve as a prototype development environment for promoting the commercialization of DMF technology.
12
Khodadad, Davood. "Combined Digital Holography and Speckle Correlation for Rapid Shape Evaluation." Licentiate thesis, Luleå University of Technology, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-55813.
Full textAbstract:
In manufacturing industry there is a high demand for on line quality control to minimize the risk of incorrectly produced objects. Conventional contact measurement methods are usually slow and invasive, meaning that they cannot be used for soft materials and for complex shapes without influencing thecontrolled parts. In contrast, interferometry and digital holography in combination with computers become faster, more reliable and highly accurate as an alternative non-contact technique for industrial shape evaluation. In digital holography, access to the complex wave field and the possibility tonumerically reconstruct holograms in different planes introduce a new degree of flexibility to optical metrology. With digital holography high resolution and precise three dimensional (3D) images of the manufactured parts can be generated. This technique can also be used to capture data in a single exposure,which is important when doing measurements in a disturbed environment.The aim of this thesis is to perform online process control of free-form manufactured objects by measuring the shape and compare it to the CAD-model. To do this, a new technique to measure surface gradients and shape based on single-shot dual wavelength digital holography and image correlation of speckle displacements is demonstrated. Based on an analytical relation between phase gradients and speckle displacements it is shown that an object is retrieved uniquely to shape and position without the unwrapping problems that usually appear in dual wavelength holography. The method is firstdemonstrated using continues wave laser light from two temperature controlled laser diodes operating at 640 nm. Further a specially designed dual core diode pumped fiber laser that produces pulsed light with wavelengths close to 1030 nm is used. One significant problem when using the dual wavelength single-shot approach is that phase ambiguities are built in to the system that needs to be corrected. An automatic calibration scheme is therefore required. The intrinsic flexibility of digital holography gives a possibility to compensate these aberrations and to remove errors, fully numerically without mechanical movements. In this thesis I present a calibration method which allows single-shot online shape evaluation in a disturbed environment. It is shown that phase maps and speckle displacements can be recovered free of chromatic aberrations. This is the first time that a single-shot dual wavelength calibration is reported by defining a criteria to make an automatic procedure.By the results of the presented work, it is experimentally verified that the single-shot dual wavelength digital holography and numerically generated speckle images can be used together with digital speckle correlation to retrieve and evaluate the object shape. The proposed method is also robust to large phasegradients and large movements within the intensity patterns. The advantage of the approach is that, using speckle displacements, the shape measurement can be done even though the synthetic wavelength is out of the dynamic range of the height variation of the object.
13
Moraes, Michelle Bianchi de. "Influência das variações de ângulos de projeção na detecção de reabsorções radiculares linguais e apicais simuladas: comparação entre subtração radiográfica digital e radiografia digital direta /." São José dos Campos: [s.n.], 2010. http://hdl.handle.net/11449/105861.
Full textAbstract:
Resumo: A reabsorção severa da raiz diagnosticada tardiamente pode acarretar a perda dentaria, e sendo a técnica de subtração radiográfica digital (SDR) um importante recurso para detecção precoce de alterações minerais, este estudo avaliou a eficiência no diagnóstico precoce da reabsorção radicular externa simulada apical e lingual, pela técnica de subtração radiográfica digital (SRD) e radiografia digital (RD). Foram utilizados 14 dentes incisivos de mandíbulas humanas maceradas com reabsorções de diferentes dimensões, simuladas na região apical e lingual, e radiografados com variação de ângulos de projeção. As radiografias foram subtraídas pelo programa Regeemy®, e para avaliação do desempenho dos métodos de diagnóstico, pares de radiografias periapicais e imagens subtraídas foram apresentadas a 2 radiologistas. De acordo com os resultados, não foram observadas diferenças estatisticamente significativas entre os métodos na detecção de reabsorções linguais, independentemente do tamanho da lesão, assim como não houve diferença entre os métodos na detecção de reabsorções apicais, com exceção do examinador 2 com relação a variação angular vertical e horizontal de 100 utilizando o maior nível de desgaste, que apresentou a radiografia digital como método superior na avaliação em relação a subtração radiográfica. E o aumento no nível de desgastes e a menor variação dos ângulos verticais e horizontais permitiram melhor avaliação nas regiões de reabsorções apicais e linguais, para detecção das reabsorções apicais e linguais. Com estes resultados podemos concluir que a subtração radiográfica digital é um exame indicado para detecção de pequenas perdas minerais em radiografias que apresentem pouca ou nenhuma variação nas angulações verticais e horizontaisAbstract: The severe root resorption diagnosed late can lead to tooth loss, and being the technique of digital subtraction radiography (SDR) as an important resource for early detection mineral changes, this study evaluated the efficiency in the early diagnosis simulated external root resorption apical and lingual by the technique of digital subtraction radiography (SRD) and digital radiography (DR). We used 14 human incisors jaw macerated with resorption different sizes, simulated in the apical and lingual, and radiographed with a range of projection angles. The radiographs were subtracted by the program Regeemy ®, and performance evaluation diagnostic methods, pairs intraoral radiographs and subtracted images were presented to two radiologists. According to the results, there were no statistically significant differences between methods in the detection lingual resorption, regardless of lesion size, as there was no difference between the methods in the detection of apical resorption, except the second examiner with respect to variation vertical and horizontal angle of 100 using the highest level of wear, which lodged the digital radiography as a method superior in the evaluation for subtraction radiography. And the increase in the level of wear and less variation vertical and horizontal angles allowed a better assessment resorption in the regions apical and lingual to detect and lingual apical resorption. With these results we conclude that the digital subtraction radiography is a test for the detection of small mineral loss in radiographs showing little or no variation in vertical and horizontal angles
Orientador: Mari Eli Leonelli de Moraes
Coorientador: Jefferson Luis Oshiro Tanaka
Banca: Rodrigo Dias Nascimento
Banca: Edmundo Médicci Filho
Banca: Milton Soares Gonçalves
Banca: Warley David Kerbauy
Doutor
14
Zaharescu, Catalin A. "Wear-quantification of textured geomembranes using digital imaging analysis." Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/36244.
Full textAbstract:
During the past decades there has been an increase in the use of geosynthetics in construction due to their versatility in providing a wide array of functions such as reinforcement, containment, separation, filtration and drainage. Often, geosynthetics are used in conjunction with other geosynthetics to accomplish these functions. However, geosynthetics create possible planes of weakness which can lead to failures. Textured geomembranes are widely used within landfill and mining industries due to their containment and shear strength properties, however, there are subjected to a wide array of loads and environments which are potentially hazardous, as such is of utmost importance to retain their integrity in order to avoid ecological disasters. The challenge is to understand how geomembranes resist damage, wear and which of these factors control the development of wear on textured geomembranes. Digital imaging techniques have been used in order to develop a protocol that describes the quantification of wear on textured structured geomembranes. Direct shear tests were performed to induce wear on the geomembrane textures (asperities) to analyse the wear mechanisms and study the factors that induce wear on the asperities. The research showed that normal stress and shear displacement have a major role in the development of wear on interfaces. However, the geometrical characteristics of the geomembrane asperities control the amount of wear the geomembrane can sustain without significant shear strength loss. These outcomes help to better understand the behaviour of interfaces which have as component geomembranes, leading to more robust designs. This study also proposed new asperity texture shapes by using Rapid Prototyping (RP) techniques, such as Selective Laser Sintering and Fused Filament Fabrication. Using RP techniques to create new textures for the geomembrane, could allow the creation of textures which have increased shear strength thresholds and better withstand wear, allowing for more advanced and economical designs.
15
Kollarits, Matthew David. "Design and Simulation of a Temperature-Insensitive Rail-to-Rail Comparator for Analog-to-Digital Converter Application." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1279036924.
Full text
16
Smithson, Paul Michael. "Rapid clock recovery algorithms for digital magnetic recording and data communications." Thesis, University of Plymouth, 1999. http://hdl.handle.net/10026.1/2635.
Full text
17
Heath, Daniel. "Digital micromirror devices and femtosecond laser pulses for rapid laser micromachining." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/417275/.
Full textAbstract:
Laser machining techniques are almost ubiquitous in industry for micro- to nanoscale fabrication. It is essential for the advancement of the field that faster, cheaper processes be developed. Enhancements in speed and fidelity of production can be made to both additive and subtractive writing techniques by using Digital Micromirror Devices (DMD), particularly when coupled with femtosecond laser pulses. The objective of this thesis is the demonstration of DMDs used in conjunction with ultrafast laser pulses for both novel and rapid machining applications; primarily image-projection based techniques, using DMDs as dynamic intensity masks, will be used for subtractive patterning, laserinduced transfer, multi-photon polymerisation and centimetre-scale micro-machining. The dynamic nature of the DMD enables its application to the field of multiple exposures, and the centimetre-scale machining is applied to functional biological assays. Adaptive mask techniques are used to enhance the image reproduction achieved, correct for positional errors introduced by translation stages, as well as to attain greyscale intensity control with a DMD in single ultrashort pulses. A new technique for producing digital holograms is developed, and will form the basis of future work. Image projection-based patterning using DMDs as dynamic intensity masks is shown via ablation, multiphoton polymerisation and Laser-Induced Transfer (LIT). Ablation was achieved in a range of materials (including, but not limited to: gold, graphite, diamond, bismuth telluride and antimony telluride, glass, nickel, glucose, and gelatin), with 2 micron resolutions in samples and overall sizes of 1cm2. A multiple exposure technique reduced final structure resolution by 2.7 compared to the diffraction limit possible in a single exposure – from 1m to 370nm on one experimental setup, and from 727nm to 270nm on a second setup. The first demonstration of shaped, solid-phase LIT deposits has been made, both in forward and backward directions of transfer. Adaptive optics techniques have been developed for DMD mask corrections, and have reduced the positional error of samples introduced by translation stages. Greyscale intensity patterns have been projected at samples using the strictly binary-style DMD display technology, and the loss of intensity in high spatial frequencies at the sample has been addressed. A novel method for the generation of binary holograms is introduced, which allows for several additional degrees of control over spatial intensity patterns when using DMDs, such as the effective mask position relative to imaging optics, greyscale control, the formation of images at multiple planes, phase control, and overall lateral shifts of the intensity distribution below a single DMD pixel width.
18
Reed, Seann Mischa. "Use of digital soil maps in a rainfall-runoff model /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
Full text
19
Rudraraju, Anirudh V. "Digital data processing and computational design for large area maskless photopolymerization." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52930.
Full textAbstract:
Large Area Maskless Photopolymerization (LAMP) is a novel additive manufacturing technology currently being developed at Georgia Tech in collaboration with the University of Michigan at Ann Arbor and PCC Airfoils. It is intended for the fabrication of integrally cored ceramic molds for the investment casting of precision components such as high-pressure turbine blades. This dissertation addresses the digital data processing and computational design needs for this technology. Several data processing schemes like direct slicing, STL slicing, post-processing schemes like error checking, part placement and tiling etc. were developed in order to enable the basic functionality of the LAMP process. A detailed overview of these schemes and their implementation details are given in this dissertation. Several computational schemes to improve the quality and accuracy of parts produced through the LAMP process were also implemented. These include a novel volume deviation based adaptive slicing method to adaptively slice native CAD models, a gray scaling and dithering approach to reduce stair stepping effect on downward facing surfaces and a preliminary experimental study to characterize the side curing behavior of the LAMP photo-curable suspension for pre-build image compensation. The implementation details and a discussion of the results obtained using these schemes are given. A novel approach for addressing the “floating island” problem encountered in additive manufacturing was also developed. The need for supports specific to the kind of parts being built through LAMP is evaluated and a support generation strategy different from the previously reported approaches in the literature is presented. Finally, a few novel film cooling schemes that are extremely challenging to fabricate using existing manufacturing technologies but possible to fabricate using LAMP are chosen and analyzed for their cooling performance. It is shown that such novel schemes perform much better in cooling the blade surface than the conventionally implemented schemes and hence this final component of work gives a better appreciation of the impact LAMP technology has in disrupting the state of the art in turbine blade manufacturing and truly taking the blade designs to the next level.
20
Mhlongo, Siyabonga. "Flexible Packaging Methodologies for Rapid Deployment of Customisable Component-based Digital Libraries." Thesis, University of Cape Town, 2006. http://pubs.cs.uct.ac.za/archive/00000320/.
Full textAbstract:
Software engineering is a discipline concerned with manufacturing or developing software. Software plays a pivotal role in everyday life, an absence of which will be devastating to a number of governmental, recreational and financial activities, amongst many others. One of the latest branches of software engineering, component-based software engineering, is concerned with the development of software systems using already existing components which speculatively will ensure rapid and inexpensive software development processes.
Parallel with the advances in software engineering, the field of digital libraries — a field dealing with Web-based access to and management of structured digital content — has adopted this development model from software engineering to shift focus from developing and using traditionally monolithic software systems to developing and using more flexible component-oriented software systems.
Since componentised development approaches are relatively recent, other areas such as packaging and managing component-based software systems still remain unattended to. This dissertation presents research on techniques and methodologies for packaging customisable component-based digital libraries such that deployment is rapid and flexibility is not compromised. Although the reference point of this research was that of component-based digital library systems, it is believed that this research can be generalised across the family of Web-based component-based software systems.
An outcome of this research was a prototype packaging system consisting of a pair of tools: a package builder tool and a package installer tool. This packaging system was developed to model the ideas and methodologies that were identified as important to the processes of packaging and installing component-based digital library systems. These tools consequently underwent a user evaluation study whereby they were evaluated for understandability, usability and usefulness to the processes of packaging and installing component-based digital libraries.
A key contribution of this research was identifying requirements for a generic component packaging framework. For a component to be seen as ”fit-to-package”, it must posses the following at the very least: the component must be configurable automatically; the component must have a formal description of its dependency software; there must be formal descriptions that describe individual components as well as systems composed of components; and there must be a way whereby installation questions are formally encoded such that components are able to correctly receive configuration information.
In totality, this research has shown that component-oriented software development approaches can benefit from an infrastructure which allows for component-based software systems to be composed, distributed and installed effortlessly.
21
Broyles, David A. "Rapid shape characterization of crushed stone by PC-based digital image processing." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-07212009-040549/.
Full text
22
Tiedt, Holger. "Virtuelle Qualitätsbewertung grossflächiger Karosserie-Anbauteile durch Simulation von Funktionseinflüssen an digital rekonstruierten Bauteilen /." Aachen : Shaker, 2009. http://d-nb.info/997987316/04.
Full text
23
Muller, Louis C. "RSFQ digital circuit design automation and optimisation." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96808.
Full textAbstract:
Thesis (PhD)--Stellenbosch University, 2015.ENGLISH ABSTRACT: In order to facilitate the creation of complex and robust RSFQ digital logic circuits an extensive library of electronic design automation (EDA) tools is a necessity. It is the aim of this work to introduce various methods to improve the current state of EDA in RSFQ circuit design. Firstly, Monte Carlo methods such as Latin Hypercube sampling and Sobol sequences are applied for their variance reduction abilities in approximating circuit yield. In addition, artificial neural networks are also investigated for their applicability in modeling the parameter-yield space. Secondly, a novel technique for circuit functional testing using automated state machine extraction is presented, which greatly simplifies the logical verification of a circuit. This method is also used, along with critical timing extraction, to automatically generate Hardware Description Language(HDL) models which can be used for high level circuit design. Lastly, the Greedy Local search, Simulated Annealing and Genetic Algorithm meta-heuristics were statistically compared in a novel manner using a yield model provided by artificial neural networks. This is done to ascertain their performance in optimising RSFQ circuits in relation to yield. The variance reduction techniques of Latin Hypercube Sampling and Sobol sequences were shown to be beneficial for the use with RSFQ circuits. For optimisation purposes the use of Simulated Annealing and Genetic Algorithms were shown to improve circuit optimisation for possible multi-modal search spaces. An HDL model is also successfully generated from a complex RSFQ circuit for use in high level circuit design which includes critical timing and propagation latency. All the techniques presented in this study form part of a software library that can be further refined and extended in future work.
24
Fourie, Coenrad Johann. "A 10 GHz oversampling delta modulating analogue-to-digital converter implemented with hybrid superconducting digital logic." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52057.
Full textAbstract:
Thesis (MScEng)--University of Stellenbosch, 2001.ENGLISH ABSTRACT: Rapid Single Flux Quantum (RSFQ) logic cells are discussed, and new cells developed. The expected yield of every cell is computed through a Monte Carlo analysis, and where necessary these cells are optimized for use in a complex system. A mathematical study of the Josephson junction and SQUIDs (Superconducting Quantum Interference devices) as switching elements precede a discussion on the operation of RSFQ and COSL (Complementary Output Switching Logic.) These logic families are implemented in low temperature niobium technology, and require liquid helium cooling. A 10 GHz oversampling delta modulating analogue-to-digital converter is then designed and constructed using RSFQ and COSL building blocks in a hybrid configuration. The design emphasis is on devising ways to test the operation of RSFQ with limited equipment. Yield analysis procedures on the complex system are discussed, followed by a detailed discussion on the circuit layout and layout problems. Software routines are developed to calculate the required dimensions of layout structures.
AFRIKAANSE OPSOMMING: Rapid Single Flux Quantum (RSFQ) logiese selle word bespreek, en enkele nuwe selle word ontwikkel. Die verwagte opbrengs, of kans dat 'n sel sal werk, word bereken deur 'n Monte Carlo analise. Waar nodig word selle met behulp van die analise verbeter vir gebruik in 'n komplekse stelsel. 'n Wiskundige studie van die Josephson-vlak en SQUIDs (Superconducting Quantum Interference devices) word gevolg deur 'n bespreking oor die werking van RSFQ en COSL (Complementary Output Switching Logic.) Hierdie logiese families word geïmplementeer in laetemperatuur niobiumtegnologie, en vereis vloeibare helium-verkoeling. 'n Deltamodulerende analoog-na-digitale omsetter met 'n intree-monstertempo van 10 GHz word ontwerp en vervaardig met 'n hibriede samestelling van RSFQ en COSL boublokke. Die ontwerp fokus op maniere om die werking van RSFQ teen 10 GHz te kan toets met die beperkte toerusting wat beskikbaar is. Opbrengsanalise op die komplekse stelsel word bespreek, gevolg deur 'n volledige bespreking van die stroombaanuitlegprosedure en uitlegprobleme. Roetines word in sagteware ontwikkel om die nodige dimensies van uitlegstrukture te bereken.
25
Koski, Antti E. "Rapid frequency estimation." Worcester, Mass. : Worcester Polytechnic Institute, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-032806-165036/.
Full textAbstract:
Thesis (M.S.)--Worcester Polytechnic Institute.Keywords: DSS; ECM; SVD; Singular Value Decomposition; rapid frequency estimation; frequency estimation. Includes bibliographical references (leaves 174-177).
26
Tomlinson, Francis J. "Do harvesting impacts determine patterns of non-forest vegetation in Dipterocarp Forest in Sabah 15 years post logging?" Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=59623.
Full text
27
Rezaei, Nejad Hojatollah. "Development of techniques for rapid isolation and separation of particles in digital microfluidics." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57956.
Full textAbstract:
Digital microfluidics (DMF) has emerged as a powerful platform for both research and development in life science studies. The platform functions based on handling small volumes of samples and reagents in the form of discrete droplets using the well-established electrowetting on dielectric (EWOD) method. Based on EWOD, different techniques (operators) have been developed to accurately manipulate, dispense, split and merge droplets of different volumes. Despite the advances made in the DMF technology especially in the use of EWOD in scaling down laboratory procedures, there is lack of understanding and hence development of techniques for particle/cell manipulation and isolation on DMF (as compared to the alternative platform called continuous microfluidics). This has hindered the capability of DMF in full-scale miniaturization of laboratory procedures requiring particle/cell isolation at any of their steps. This research focuses on addressing this problem and developing reliable techniques to manipulate, concentrate and isolate different types of particles/cells. The techniques presented here are particularly developed to limit the use of external devices and also cover a wide range of particles and cells with different physical properties (including size, density, material and electromagnetic properties). They include magnetic collection, hydrodynamic focusing, dielectrophoresis positioning of the particles. The magnetic collection method, a rather simple but effective and widely used in biochemistry, is implemented on DMF for capturing target analytes. The hydrodynamic focusing method, functioning based on the density and size of the particles, were developed and integrated into DMF (for the first time) using especial electrode geometry facilitating the rotation of the droplet. The dielectrophoresis–based particle manipulation is optimized to achieve high resolution and controllability in particle patterning on DMF. The applicability of each of these techniques are demonstrated for different biological and physical applications including on-chip DNA purification (using the magnetic collection technique), ultra-low DNA concentration (using the hydrodynamic focusing technique for achieving desired concentrations of particles), and cell and particle patterning and cell culturing on a DMF platform (using the dielectrophoresis positioning technique). The diversity and flexibility of these techniques will enable the use of DMF devices for especially point-of-care applications.Applied Science, Faculty of
Engineering, School of (Okanagan)
Graduate
28
Moraes, Michelle Bianchi de [UNESP]. "Influência das variações de ângulos de projeção na detecção de reabsorções radiculares linguais e apicais simuladas: comparação entre subtração radiográfica digital e radiografia digital direta." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/105861.
Full textAbstract:
Made available in DSpace on 2014-06-11T19:35:09Z (GMT). No. of bitstreams: 0
Previous issue date: 2010-08-05Bitstream added on 2014-06-13T18:46:28Z : No. of bitstreams: 1
moraes_mb_dr_sjc.pdf: 1197811 bytes, checksum: 257ea85b7a3e332fae697c54b7a1c2a9 (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A reabsorção severa da raiz diagnosticada tardiamente pode acarretar a perda dentaria, e sendo a técnica de subtração radiográfica digital (SDR) um importante recurso para detecção precoce de alterações minerais, este estudo avaliou a eficiência no diagnóstico precoce da reabsorção radicular externa simulada apical e lingual, pela técnica de subtração radiográfica digital (SRD) e radiografia digital (RD). Foram utilizados 14 dentes incisivos de mandíbulas humanas maceradas com reabsorções de diferentes dimensões, simuladas na região apical e lingual, e radiografados com variação de ângulos de projeção. As radiografias foram subtraídas pelo programa Regeemy®, e para avaliação do desempenho dos métodos de diagnóstico, pares de radiografias periapicais e imagens subtraídas foram apresentadas a 2 radiologistas. De acordo com os resultados, não foram observadas diferenças estatisticamente significativas entre os métodos na detecção de reabsorções linguais, independentemente do tamanho da lesão, assim como não houve diferença entre os métodos na detecção de reabsorções apicais, com exceção do examinador 2 com relação a variação angular vertical e horizontal de 100 utilizando o maior nível de desgaste, que apresentou a radiografia digital como método superior na avaliação em relação a subtração radiográfica. E o aumento no nível de desgastes e a menor variação dos ângulos verticais e horizontais permitiram melhor avaliação nas regiões de reabsorções apicais e linguais, para detecção das reabsorções apicais e linguais. Com estes resultados podemos concluir que a subtração radiográfica digital é um exame indicado para detecção de pequenas perdas minerais em radiografias que apresentem pouca ou nenhuma variação nas angulações verticais e horizontais
The severe root resorption diagnosed late can lead to tooth loss, and being the technique of digital subtraction radiography (SDR) as an important resource for early detection mineral changes, this study evaluated the efficiency in the early diagnosis simulated external root resorption apical and lingual by the technique of digital subtraction radiography (SRD) and digital radiography (DR). We used 14 human incisors jaw macerated with resorption different sizes, simulated in the apical and lingual, and radiographed with a range of projection angles. The radiographs were subtracted by the program Regeemy ®, and performance evaluation diagnostic methods, pairs intraoral radiographs and subtracted images were presented to two radiologists. According to the results, there were no statistically significant differences between methods in the detection lingual resorption, regardless of lesion size, as there was no difference between the methods in the detection of apical resorption, except the second examiner with respect to variation vertical and horizontal angle of 100 using the highest level of wear, which lodged the digital radiography as a method superior in the evaluation for subtraction radiography. And the increase in the level of wear and less variation vertical and horizontal angles allowed a better assessment resorption in the regions apical and lingual to detect and lingual apical resorption. With these results we conclude that the digital subtraction radiography is a test for the detection of small mineral loss in radiographs showing little or no variation in vertical and horizontal angles
29
Leite, Rafael Valadares. "Desenvolvimento de um espectrômetro nuclear digital de radiação gama." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-08032007-175805/.
Full textAbstract:
O método nuclear gamaespectrométrico vem ganhando espaço em diversas aplicações como fornecer a informação médica em um paciente ou de uma galáxia distante, detectar radioatividade para fins de segurança e medir a concentração de radioelementos em um mineral ou rocha. Esta dissertação apresenta um projeto e implementação de um espectrômetro gama digital conectado a um conjunto detector contendo cristal cintilador de iodeto de sódio dopado com tálio. O hardware é baseado em um dispositivo lógico programável da família CoolRunner II da Xilinx e um conversor analógico-digital de 80 MHz da Analog Devices. A aquisição de dados é executada em um computador pessoal comum. As linguagens de programação utilizadas foram VHDL e C#. O objetivo desta dissertação é apresentar todas as etapas necessárias para o desenvolvimento de um gamaespectrômetro digital e inclui pesquisa bibliográfica, estudo do equipamento, modelagem dos cristais, simulação do projeto de um gamaespectrômetro, montagem do circuito eletrônico, desenvolvimento do processamento e lógica do circuito, criação do software de aquisição dos dados em tempo real e apresentação dos resultados obtidos.The gammaspectrometric method has been used for diverse applications as to supply the medical information in a patient or a distant galaxy, to detect radioactivity at airport and to measure the concentration of radioelements in a mineral or rock. This work presents a digital gammaspectrometer project and implementation for acquisition of radiometric data, the spectrometer is connected to a gamma-ray detector NaI(Tl). The two main components in hardware are complex programmable logical device of the family CoolRunner II Xilinx and an 80 MHz analog to digital converter of brand Analog Devices. The acquisition of data is executed in a common personal computer. The programming languages used are VHDL and C#. The objective of this work is to present all the needful stages for the digital gammaspectrometry development that includes theorem, equipment studying, crystal modeling, gammaspectrometry modeling and simulation, electronic circuit assembly, processing and logic circuit development, data acquisition software in real time development and presentation of results.
30
Klimis, Harry Emanuel. "Digital Health Interventions for Cardiovascular Disease Prevention Within a Rapid Access Cardiology Model of Care." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25555.
Full textAbstract:
Background
Cardiovascular disease (CVD) risk assessment can improve outcomes, but novel methods to identify high-risk patients and deliver prevention programs are needed. Rapid Access Cardiology (RAC) services can provide rapid risk assessment but have not been evaluated in Australia. Within RAC there is the potential to also implement systems that identify high-risk patients and manage risk using novel strategies. Mobile health (mHealth) provides a unique opportunity to deliver prevention programs and may influence behaviours. There is, however, limited evidence for mHealth efficacy in primary prevention.
Aims
To assess the utility of RAC to identify and manage patients at high-risk of CVD, and to leverage this opportunity to provide preventative care using mHealth.
Methods and results
Methods used include cohort studies, data audits, secondary analyses, and a randomised controlled trial (RCT). Part 1 evaluates the role of RAC for the assessment of suspected CVD and identifies gaps in risk factor assessment. RAC for chest pain and arrhythmia safely reduced unplanned hospitalisation. Many patients had multiple uncontrolled risk factors, but gaps exist in electronic data required to quantify risk. Part 2 examines the role of mHealth to improve CVD prevention, and identifies factors associated with effective text message-based programs. Message intent significantly influenced engagement. Patients with higher baseline risk were more likely to change behaviour. Part 3 evaluates text messages for CVD primary prevention via a RCT in higher risk patients from RAC. The primary outcome (difference in the proportion with 3 uncontrolled risk factors) was not significant at 6 months. However, the intervention improved risk factor control from baseline.
Conclusion
The results support a novel healthcare model which utilises digital health to optimise CV risk assessment and provide continued support to patients at elevated risk extending beyond the traditional clinical interface.
31
Oliveira, Diego Jucá de Lima. "O uso da prototipagem e fabricação digital no ambiente FAB LAB." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/142793.
Full textAbstract:
Até recentemente as novas tecnologias de fabricação digital só eram encontradas na indústria e em algumas universidades. Hoje essas tecnologias estão cada vez mais acessíveis e baratas e têm se consolidado como grandes aliadas no processo de projeto em áreas como Arquitetura, Design e Engenharia. Ambientes como os Fab Labs têm auxiliado o processo de desenvolvimento de produto e a realização de experimentações através da prototipagem rápida e da fabricação digital, oferecendo de forma aberta, suporte na utilização de um conjunto de ferramentas digitais. Dessa forma, buscou-se, como objetivo geral neste trabalho, evidenciar o potencial dos Fab Labs como ambientes para o uso da fabricação digital e da prototipagem rápida no processo de projeto. Como forma de atingir esse objetivo, foi realizada uma pesquisa qualitativa, através de estudo de caso e por meio de entrevista com gestores de três Fab Labs situados no Brasil. Inicialmente, foi feita uma abordagem sobre temas como prototipagem rápida e fabricação digital, buscando o esclarecimento do tema e a formação do corpo teórico. A pesquisa bibliográfica abordou temas como tipos de protótipos e a importância do ato de prototipar. Os resultados obtidos por intermédio das entrevistas e das observações, apresenta considerações importantes em relação ao conceito Fab Lab enquanto potencializador no desenvolvimento de projetos.Until recently the new digital manufacturing technologies were only found in the industry and some universities. Today these technologies are increasingly affordable and cheap and have been established as major allies in the design process in areas such as Architecture, Design and Engineering. Environments such as Fab Labs have aided the product development process and performing trials through rapid prototyping and digital fabrication, providing an open, support the use of a set of digital tools. Thus, it sought to, the general objective of this study was to highlight the potential of Fab Labs as environments for the use of digital manufacturing and rapid prototyping in the design process. In order to achieve this goal, a qualitative survey was conducted through case study and through interviews with managers of three Fab Labs located in Brazil. Initially, an approach on issues such as rapid prototyping and digital manufacturing was made, seeking the theme of enlightenment and the formation of the theoretical body. The literature has addressed such topics as types of prototypes and the importance of prototyping act. The results obtained through the interviews and observations, presents important considerations regarding the concept Fab Lab while potentiating the development projects.
32
Kastamonitis, Konstantinikos. "A study of up-link power control for digital satellite links in rain condtitions." Thesis, University of Portsmouth, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416223.
Full text
33
Rodriquez, Lorena. "COVID-19 AND ITS IMPACT ON A RAPID DIGITAL IMPLEMENTATION : An employee’s insight of a company without the prior infrastructure." Thesis, Umeå universitet, Sociologiska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-187850.
Full textAbstract:
The COVID-19 pandemic impacted many around the world, some more than others, having socioeconomic impacts around the globe. Due to its rapid spread many countries implemented restrictions, such as quarantines to uphold social distancing between its citizens. In addition, the coronavirus has not only affected people’s way of life but also many companies’ financial health worldwide. This pandemic’s side effects has resulted in increased digital transformation, causing many companies without the required infrastructure to rapidly implement mechanism and strategies to handle this type of work style. This studies aim is to give an insight in employee’s experiences and reactions to a rapid digital implementation, in a company without the infrastructure in place. With the help of an inductive approach and a multi level framework, four themes emerged from the interviews conducted ImplementationConsequences, Organizational Support, Expectations of Digital Implementation and Work-related Differences. The results showed that there is a discrepancy between the necessary factors for a successful implementation, highlighted in the model used and the respondent’s answers. Linked to this was the gender differences, a new factor arising from the data collected, emphasising the difficulties linked to teleworking but affecting a proactive use of digital tools, and hence lowering the work productivity. Even though there were differences, there were also parables showing that acceptance, attitude, and involvement in the implementation, among other factors are crucial for an openness towards digitalization. Finally, these factors and their relationship with digital implementation as well as the pandemic were explored trough a multi level framework.
34
Manokaran, N. "Population dynamics of tropical forest trees." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 1988. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=59678.
Full text
35
Bakolo, Rodwell S. "Design and implementation of a RSFQ superconductive digital electronics cell library." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17936.
Full textAbstract:
Thesis (MScEng)--Stellenbosch University, 2011.ENGLISH ABSTRACT: Rapid Single Flux Quantum (RSFQ) cells are key in the design of complex and applicable RSFQ electronic circuits. These cells are low-level circuit elements that are used repeatedly to build larger, applicable RSFQ circuitry. Making these cells simple to layout and manufacture, but reliable for extensive use demands a careful development process for RSFQ cells. Cell functionality is verified through simulations, thereafter the cell is laid out in special software packages. Inductance of on-chip superconductor structures is extracted through careful modelling with numerical field solver software. A cell library has been developed by incorporating existing or published cells after further analysis and optimization, as well as developing new cells. Cells that have been adapted into the library include the Josephson transmission line (JTL), Splitter, Merger, D-Flip Flop (DFF), T-Flip Flop (TFF), NOT, AND, OR and XOR, DC-SFQ and SFQ-DC and PTL Driver and Receivers. New cells include NOR, NAND and XNOR. The cells were designed for the IPHT’s RSFQ1D 1kA/cmª and Hypres’ 4.5kA/cmª processes. The cells in the library have good bias current operating margins obtained through simulations (> ±26%). All cells have all the parameters listed in the thesis including extracted inductance values. In order to have a complete and verified RSFQ cell library, cells have been sent for fabrication at IPHT and Hypres facilities. These cells can now be tested on-chip, in the laboratory, to establish functionality and practical bias current margins. All test signal patterns and bias currents required for testing are defined to allow co-workers or collaborators to test the cells.
AFRIKAANSE OPSOMMING: "Rapid Single Flux Quantum" (RSFQ) selle is van sleutelbelang in die ontwerp van komplekse en toepaslike RSFQ elektroniese stroombane. Hierdie selle is laevlak stroombaanelemente wat herhaaldelik gebruik word om groter RSFQ bane mee te bou. Versigtige ontwikkeling is nodig om hierdie selle eenvoudig vir uitleg en vervaardiging te hou terwyl dit ook betroubaar is vir wye gebruik. Selfunksionaliteit word geverifieer deur middel van simulasies, waarna selle vir vervaardiging uitgelê word in spesiale sagtewarepakette. Induktansie van supergeleierstrukture op vervaardigde skyfies word deur versigtige modellering met behulp van numeriese veldoplossingsagteware onttrek. In hierdie tesis is ’n selbiblioteek ontwerp deur bestaande (gepubliseerde) selle verder te analiseer en optimeer, en deur nuwe selle te ontwerp om die biblioteek volledig te maak. Selle wat aangepas is vir hierdie biblioteek sluit die Josephson-Transmissielyn (JTL), Verdeler, Samevoeger, DWipkring (DFF), T-Wipkring (TFF), NIE, EN, OF en XOF, asook die DC-SFQ en SFQ-DC selle en Passiewe Transmissielyn (PTL) drywers en ontvangers in. Nuwe selle sluit die NOF, NEN en XNOF hekke in. Die selle is ontwerp en uitgelˆe vir beide IPHT se RSFQ1D 1kA/cmª en Hypres se4.5kA/cmª prosesse. Die selle in die biblioteek toon goeie voorspanningstroom-werksmarges, soos verkry deur simulasie (> ±26%). Parameters en berekende induktansies vir alle selle word in die tesis gelys vir naslaandoeleindes. Vir die daarstel van ’n volledige en geverifieerde RSFQ selbiblioteek is selontwerpe vir vervaardiging na IPHT en Hypres gestuur. Aangesien vervaardiging slegs een maal per jaar by IPHT gedoen word, is die skyfies egter nog nie beskikbaar nie. Na vervaardiging kan die skyfies egter getoets word om selfunksionaliteit in die laboratorium te meet. Ten einde hierdie toetsing vir enige medewerker te vergemaklik, word alle toetsparameters soos voorspanningstroom en intreeseinpatrone in die tesis gedefinieer.
36
Setetemela, Khobatha. "Comparative study of tool-flows for rapid prototyping of software-defined radio digital signal processing." Master's thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/30085.
Full textAbstract:
This dissertation is a comparative study of tool-flows for rapid prototyping of SDR DSP operations on programmable hardware platforms. The study is divided into two parts, focusing on high-level tool-flows for implementing SDR DSP operations on FPGA and GPU platforms respectively. In this dissertation, the term ‘tool-flow’ refers to a tool or a chain of tools that facilitate the mapping of an application description specified in a programming language into one or more programmable hardware platforms. High-level tool-flows use different techniques, such as high-level synthesis to allow the designer to specify the application from a high level of abstraction and achieve improved productivity without significant degradation in the design’s performance. SDR is an emerging communications technology that is driven by - among other factors – increasing demands for high-speed, interoperable and versatile communications systems. The key idea in SDR is the need to implement as many as possible of the radio functions that were traditionally defined in fixed hardware, in software on programmable hardware processors instead. The most commonly used processors are based on complex parallel computing architectures in order to support the high-speed processing demands of SDR applications, and they include FPGAs, GPUs and multicore general-purpose processors (GPPs) and DSPs. The architectural complexity of these processors results in a corresponding increase in programming methodologies which however impedes their wider adoption in suitable applications domains, including SDR DSP. In an effort to address this, a plethora of different high-level tool-flows have been developed. Several comparative studies of these tool-flows have been done to help – among other benefits – designers in choosing high-level tools to use. However, there are few studies that focus on SDR DSP operations, and most existing comparative studies are not based on well-defined comparison criteria. The approach implemented in this dissertation is to use a system engineering design process, firstly, to define the qualitative comparison criteria in the form of a specification for an ideal high-level SDR DSP tool-flow and, secondly, to implement a FIR filter case study in each of the tool-flows to enable a quantitative comparison in terms of programming effort and performance. The study considers Migen- and MyHDL-based open-source tool-flows for FPGA targets, and CUDA and Open Computing Language (OpenCL) for GPU targets. The ideal high-level SDR DSP tool-flow specification was defined and used to conduct a comparative study of the tools across three main design categories, which included high-level modelling, verification and implementation. For tool-flows targeting GPU platforms, the FIR case study was implemented using each of the tools; it was compiled, executed on a GPU server consisting of 2 GTX Titan-X GPUs and an Intel Core i7 GPP, and lastly profiled. The tools were moreover compared in terms of programming effort, memory transfers cost and overall operation time. With regard to tool-flows with FPGA targets, the FIR case study was developed by using each tool, and then implemented on a Xilinx 7 FPGA and compared in terms of programming effort, logic utilization and timing performance.
37
Pesare, Stefano. "Sistemi di Backup e tecniche di conservazione dei dati digitali." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Find full textAbstract:
La tesi si occupa del problema della conservazione dei dati digitali, spesso sottovalutato. Le odierne tecniche e strategie di conservazione e archiviazione non possono garantire da sole la sicurezza dei dati nel tempo, ma solo se vengono utilizzate sinergicamente. Durante questo percorso capiremo cosa siano i dati digitali, le loro caratteristiche e problematiche inerenti la loro gestione, nonché le tecniche di conservazione e storage. Vedremo come si sono evolute le memorie di massa, dalle schede perforate fino alla nascita dei dischi a stato solido. Inoltre, verranno introdotti il Cloud Computing e il ventaglio di servizi che offre, compreso il Cloud Storage. Infine, si mostreranno gli algoritmi principali di compressione, utili nella gestione dei dati.
38
Ayub, Priscila Vaz. "Analysis of the maxillary dental arch after rapid maxillary expansion in patients with unilateral complete cleft lip and palate." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/61/61132/tde-14012015-094508/.
Full textAbstract:
Objective: The aim of this study was to evaluate the dentoalveolar effects of rapid maxillary expansion in children with unilateral complete cleft lip and palate in comparison with non-cleft patients. Methods: The experimental group (EG) was composed of 25 patients with unilateral and complete cleft lip and palate (9 males and 15 females) with a mean age of 10.6 years. The control group (CG) comprised of 27 patients without cleft lip and palate (14 males and 13 females) with a mean age of 9.1 years. Dental models of the maxillary dental arch were obtained immediately preexpansion (T1) and 6 months post-expansion (T2) at the time of appliance removal. Digital dental models were obtained using the 3Shape R700 3D laser scanner (3Shape A/S, Copenhagen, Denmark). Transversal widths, arch perimeter, arch length, palatal depth, palatal volume, canine and posterior tooth inclination were digitally measured. Paired t-test was used to perform interphase comparisons and independent t-test to perform intergroup comparisons (p<0.05). Results: In the experimental group, the expansion produced a ignificant increase of all maxillary transverse measurements, palatal volume, arch perimeter and palatal depth while decreased the arch length. RME caused a buccal tip of posterior teeth in patients with UCLP. No differences were observed between experimental and control groups for all the measurements performed except for the intermolar distance (6-6), which showed a greater increase in patients with cleft. Conclusion: Rapid maxillary expansion showed similar dentoalveolar effects in children with UCLP and without oral clefts.Objective: The aim of this study was to evaluate the dentoalveolar effects of rapid maxillary expansion in children with unilateral complete cleft lip and palate in comparison with non-cleft patients. Methods: The experimental group (EG) was composed of 25 patients with unilateral and complete cleft lip and palate (9 males and 15 females) with a mean age of 10.6 years. The control group (CG) comprised of 27 patients without cleft lip and palate (14 males and 13 females) with a mean age of 9.1 years. Dental models of the maxillary dental arch were obtained immediately preexpansion (T1) and 6 months post-expansion (T2) at the time of appliance removal. Digital dental models were obtained using the 3Shape R700 3D laser scanner (3Shape A/S, Copenhagen, Denmark). Transversal widths, arch perimeter, arch length, palatal depth, palatal volume, canine and posterior tooth inclination were digitally measured. Paired t-test was used to perform interphase comparisons and independent t-test to perform intergroup comparisons (p<0.05). Results: In the experimental group, the expansion produced a ignificant increase of all maxillary transverse measurements, palatal volume, arch perimeter and palatal depth while decreased the arch length. RME caused a buccal tip of posterior teeth in patients with UCLP. No differences were observed between experimental and control groups for all the measurements performed except for the intermolar distance (6-6), which showed a greater increase in patients with cleft. Conclusion: Rapid maxillary expansion showed similar dentoalveolar effects in children with UCLP and without oral clefts.
39
Lindvall, Henrik. "Digitalisering av byggledning i anläggningsbranschen." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-66105.
Full text
40
Lobo, Desmond. "Rapid identification of rootkit infections using data mining." Thesis, University of Ballarat, 2010. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/44308.
Full textAbstract:
"The main part of this thesis presents a new approach to the topic of conjugation, with applications to various optimization problems. It does so by introducing (what we call) G-coupling functions."Doctor of Philsophy
41
Moreira, Fernanda. "O uso de modelos físicos na indústria cerâmica durante o processo de desenvolvimento de projeto de produto e as possibilidades da inserção de tecnologias digitais nesse processo - estudos de casos." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/16/16134/tde-11072014-101956/.
Full textAbstract:
O objetivo deste trabalho é apresentar informações sobre o uso de modelos físicos na indústria cerâmica como parte integrante do método de projeto e identificar as possibilidades de utilização de tecnologias digitais nesse processo, verificando possíveis contribuições para o design. Esta é uma pesquisa qualitativa, que se utiliza de procedimentos adotados em estudos de casos múltiplos, a partir da investigação de duas indústrias de cerâmica para cada um dos setores fabris: louça de mesa, louça sanitária, cerâmica decorativa/ ornamental, revestimentos cerâmicos, telhas e blocos estruturais. Foram realizadas pesquisas bibliográficas e de campo, por meio de visitas a indústrias cerâmicas, a representantes de equipamentos de tecnologias digitais, a centros de pesquisa nacional e internacional e a instituições que possuem os equipamentos digitais para obtenção de modelos físicos. Os modelos físicos são muito utilizados em projetos de design durante as fases de desenvolvimento de produto e servem para gerar, analisar e selecionar as alternativas propostas, fornecendo respostas a problemas que surgem através de testes e simulações que devem ser adequados às questões e informações que se pretende coletar. Tradicionalmente, o processo de desenvolvimento de modelos físicos na indústria cerâmica requer conhecimentos técnicos e depende de muito treinamento e habilidades manuais dos modeladores. O uso de tecnologias digitais é muito difundido em outros segmentos da indústria, devido à capacidade de transformar rapidamente e com precisão modelos virtuais computadorizados em modelos físicos. Para compreender como cada segmento da indústria cerâmica utiliza os modelos físicos evidenciaram-se suas especificidades, quanto aos aspectos de configuração dos produtos e limitações dos materiais e dos processos de fabricação. Analisaram-se as seguintes tecnologias digitais: processos de prototipagem rápida, usinagem CNC e escaneamento 3D. Este trabalho demonstrou como processos analógicos tradicionais podem ser complementados e/ou substituídos para obtenção dos modelos físicos a partir da inserção de tecnologias digitais nesse processo.The purpose of this study is to present information on the use of physical models in the ceramic industries as an integral part of the project method as well as identify the possibilities of using digital technologies in this process for possible contributions to the design. This is a qualitative research, which uses procedures adopted in multiple case studies, from the results of a survey on two ceramic industries for each of the industrial sectors: tableware, sanitary ware, decorative / ornamental ceramic tiles, tiles, ceramic roofing and building blocks. Bibliographical and field researches were conducted through visit to ceramics industries, representatives of digital technology equipment, national and international research centers and institutions that own digital equipment to obtain physical models. The physical models are widely used in design projects during the phases of product development and serve to generate, analyze and select the proposed alternatives, in order to provide answers to problems which arise through tests and simulations and that must be appropriated to the issues and information that are intended to be collected. Traditionally, the development process of physical models in the ceramic industry requires technical knowledge and depends on training and manual skills of the modelers. The use of digital technologies is widespread in other segments of the industry due to the ability to turn quickly and accurately, virtual computer models into physical models. In order to understand how each segment of the ceramic industry uses physical models, their specificities had to be evidenced, regarding aspects of product configuration and limitations of materials and manufacturing processes. The following digital technologies were analyzed: rapid prototyping process, CNC machining and 3D scanning. This work demonstrated how the traditional analog processes can be complemented and/or substituted in order to obtain physical models through the insertion of digital technologies in this process.
42
Silveira, Priscila Fernanda da. "Capacidade diagnóstica da radiografia digital na avalição de reabsorções radiculares internas simuladas com desmineralização ácida." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/149701.
Full textAbstract:
Introdução: As reabsorções radiculares internas (RRI) são lesões de prognóstico difícil e o seu diagnóstico é baseado, principalmente, em exames de imagem. Tanto lesões pequenas quanto perfurações em lesões extensas são situações críticas e um desafio para o diagnóstico. As poucas pesquisas que investigaram a detecção de RRI e de perfurações causadas pelas mesmas, simularam as lesões com uso de brocas, criando cavidades com forma e limites definidos diferentes da realidade clínica. Assim, o objetivo deste estudo foi avaliar a capacidade diagnóstica das radiografias digitais, com diferentes filtros, em duas situações clínicas: na detecção de RRI pequenas; e na visualização das paredes dentinárias remanescentes e na detecção de perfurações em RRI simuladas, com desmineralização ácida. Materiais e métodos: Foram simuladas lesões de RRI com desmineralização ácida nos condutos radiculares de 42 dentes monorradiculares, seccionados no sentido coronal, reposicionados e colocados em alvéolos de uma mandíbula seca. Radiografias digitais com placas de fósforo (Vista Scan - Dürr Dental, Germany) com dissociação foram realizadas, em momentos diferentes para os objetivos, Obj.1: antes (GC) e após (GT) a simulação de RRI pequenas; Obj.2: após a simulação de lesões extensas com remanescente de parede dentinária (GC) e com perfuração da parede lateral da raiz (GT). Todas as imagens foram exportadas e 7 filtros de processamento foram aplicados para a análise mais a imagem original (sem filtro). Três examinadores utilizando uma escala Likert de 5 pontos avaliaram as imagens quanto: Obj.1, a presença/ausência de RRI; Obj.2, a presença/ausência de perfuração. O índice Kappa intra e inter-examinadores foi calculado para avaliar a reprodutibilidade. Testes de diagnóstico e AcROC foram calculados para cada grupo (GT e GC) e para cada filtro de imagem. A distância do escore determinado na escala até o valor do padrão-ouro foi utilizado para mensurar a certeza/incerteza no diagnóstico. Equações de Estimação Generalizadas (GEE) foram utilizadas para a análise estatística, com significância de 0,05%. Resultados: Valores moderados de Kappa-inter (0,403-0,620) e altos de intra-examinadores (0,757-0,915) foram observados. Para Obj.1: Maior percentual de acertos ocorreu no GC, significativamente (p<0,05). Imagens originais apresentaram maior sensibilidade e AcROC (0,595-0,750) e o filtro Endo apresentou maior especificidade (0,952), em relação às demais imagens, sem diferença estatística entre elas (p>0,05). Os filtros Inversion e Pseudo3D causaram maior incerteza no diagnóstico das RRI, estatisticamente significante para o GC com o filtro Pseudo3D (p<0,05). Para Obj.2: Imagens com o filtro Pseudo3D resultaram em mais escores de dúvida (73,5-78%), e maiores distâncias do padrão ouro, gerando maior incerteza no diagnóstico, significativamente (p<0,05), em relação aos demais filtros. Maior acROC (0,615) foi relacionada ao filtro Perio, sem diferença estatística (p>0,05). Maiores distâncias, refletindo maiores incertezas nos diagnósticos, foram observadas no GC para todos as imagens. O percentual de acerto foi menor conforme diminuiu a espessura da parede remanescente, com 31% de acerto para as espessuras de 0,2mm. Conclusões: Paras as lesões de RRI pequenas: os filtros Inversion e Pseudo3D são contraindicados, pois geram muit incertezas aumentando a probabilidade de erros de diagnóstico. Em casos de dúvida, a imagem sem filtro (Original) deve ser buscada, pois apresenta maior capacidade diagnóstica e permite maior certeza na avaliação. Para as lesões de RRI extensas, com suspeita de perfuração: o filtro Pseudo3D deve ser evitado pois gera maior incerteza no diagnóstico e filtro Perio deve ser incentivado, pois facilita a avaliação, aumentando as chances de diagnósticos corretos. Deve-se ter em mente que nos casos diagnosticados como perfuração, ainda pode existir uma camada de parede dentinária remanescente.Introduction: Internal root resorption (RRI) are difficult to predict injuries and its diagnosis is mainly based on imaging studies. Both minor injuries as punctures in extensive lesions are critical situations and a challenge for diagnosis. The few studies that investigated the detection of RRI and punctures caused by them, simulated lesions with use of drills, creating cavities with different shape and defined limits of clinical reality. The objective of this study was to evaluate the diagnostic ability of digital radiographs with different filters in two clinical situations: small RRI detection; and in view of the remaining dentin walls and to detect perforations in RRI simulated with acid demineralization. Methods: RRI injuries were simulated with acid demineralization in root canals of 42 teeth monoradicular, sectioned coronally repositioned and placed in wells of a dry jaw. digital radiographs with phosphor plates (Vista Scan - Dürr Dental, Germany) and dissociation were taken at different times for the purposes, Aim 1: Before (CG=control group) and after (TG=test group) simulating small RRI; Aim 2: after simulation with extensive lesions reminiscent of dentinal wall (CG) and perforation on the lateral wall of the root (GT). All images were exported and 7 processing filters were applied to the analysis over the original image (no filter). Three examiners using a 5-point Likert scale images evaluated as Aim 1, the presence / absence of RRI; Aim 2, the presence / absence of perforation. The Kappa intra and inter-examiner was calculated to assess reproducibility. Diagnostic tests and AcROC were calculated for each group (CG and TG) and for each image filter. The distance determined score on the scale to the value of the gold standard was used to measure the certainty / uncertainty in diagnosis. Generalized Estimating Equations (GEE) were used for statistical analysis with significance level of 0.05%. Results: moderate values of Kappa-inter (0.403 to 0.620) and high intra-rater (0.757 to 0.915) were observed. For objective 1: A higher percentage of hits occurred in the GC, significantly (p <0.05). Original images showed higher sensitivity and AcROC (0.595 to 0.750) and Endo filter showed higher specificity (0.952), compared to other images, with no statistical difference between them (p> 0.05). The filter Inversion and Pseudo3D caused greater uncertainty in the diagnosis of RRI statistically significant GC with the filter Pseudo3D (p <0.05). For the purpose of 2: Images with the filter Pseudo3D resulted in more scores of doubt (from 73.5 to 78%), and greater distances from the gold standard, leading to greater uncertainty in the diagnosis, significantly (p <0.05) compared to other filters. Most acROC (0.615) was related to the filter Perio, with no statistical difference (p> 0.05). Greater distances, reflecting greater uncertainty in diagnosis were observed in the control group for all the images. The hit percentage was lower as decreased the thickness of the remaining wall, with 31% accuracy for thickness of 0.2 mm. Conclusions: Paras small lesions RRI: Inversion and the Pseudo3D filters are contraindicated because they generate too many uncertainties increasing the probability of misdiagnosis. In cases of doubt, the image without filter (Original) must be sought, because it has greater diagnostic capacity and allow greater certainty in the assessment. the extensive RRI injuries, suspected of drilling: the Pseudo3D filter should be avoided because it creates greater uncertainty in the diagnosis and filter Perio should be encouraged as it facilitates the evaluation, increasing the chances of correct diagnoses. It should be borne in mind that in cases diagnosed as drilling, there may still be a remaining dentin wall layer.
43
Aounis, Abdulmagid. "An investigation into induction motor vector control based on reusable VHDL digital architectures and FPGA rapid prototyping." Thesis, De Montfort University, 2002. http://hdl.handle.net/2086/5206.
Full text
44
Sá, Saione Cruz. "Comparação da acurácia entre tomografia computadorizada de feixe cônico e radiografia digital no diagnóstico de reabsorções cervicais invasivas simuladas." Florianópolis, 2011. http://repositorio.ufsc.br/xmlui/handle/123456789/96033.
Full textAbstract:
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde. Programa de Pós-Graduação em OdontologiaMade available in DSpace on 2012-10-26T08:11:03Z (GMT). No. of bitstreams: 1 301798.pdf: 1780277 bytes, checksum: bc2f2a58c2e7d58841be5a65876c37e2 (MD5)
O estudo comparou acurácia entre tomografia computadorizada de feixe cônico (TCFC) e radiografia digital (RD) no diagnóstico de reabsorções cervicais invasivas (RCI) simuladas com diferentes extensões. Cem molares humanos divididos em 4 grupos experimentais (RCI1, RCI2, RCI3 e RCI4) e um controle (RCI0) foram posicionados em um crânio humano seco. Nos dentes dos grupos experimentais foram simuladas RCI classes 1, 2, 3 e 4. O número de cada grupo foi representado pelo da classificação das RCI, que foi dado de acordo com a extensão da lesão. Em seguida, imagens radiográficas e tomográficas foram obtidas e um examinador calibrado as avaliou por meio dos softwares nativos de ambos os equipamentos. A concordância intraobservador foi alta para ambos os exames diagnósticos, com 100% de concordância para presença de RCI, RCI 1 e 2, quando a TCFC foi empregada. Os valores de sensibilidade, especificidade, VPP e VPN foram mais altos para todos os grupos na observação das imagens por TCFC. A TCFC apresentou 100% de acurácia na detecção da presença de RCI e maior acurácia que a RD no diagnóstico de todos os grupos. A RD apresentou resultados estatisticamente equivalentes à TCFC (p>0,05) para detecção das classes de RCI, entretanto, para detecção da presença de RCI, a TCFC apresentou melhor desempenho, sendo estatisticamente significante (p<0,05). Portanto, concluiu-se que apesar da TCFC e RD apresentarem-se equivalentes para detecção das classes de RCI, a TCFC apresentou maior acurácia no diagnóstico da presença de RCI e no diagnóstico de lesões de RCI simuladas em diferentes-extensões.
45
Seára, Juliana Nicolau. "Comparação entre a radiografia periapical digital e a tomografia computadorizada de feixe cônico na detecção de reabsorção radicular em molares decíduos." Florianópolis, 2012. http://repositorio.ufsc.br/xmlui/handle/123456789/99397.
Full textAbstract:
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde. Programa de Pós-Graduação em OdontologiaMade available in DSpace on 2013-03-04T19:59:47Z (GMT). No. of bitstreams: 1 305578.pdf: 1508782 bytes, checksum: dbc22eb4f13856530fba07695a8ce1d4 (MD5)
Introdução: O objetivo deste estudo foi avaliar e comparar a acurácia da radiografia periapical digital (RPD) e da tomografia computadorizada de feixe cônico (TCFC) na detecção de reabsorção radicular em molares decíduos. Métodos: A amostra foi composta por, 43 molares decíduos superiores e inferiores, com e sem reabsorção radicular. Estes dentes foram posicionados em um crânio seco humano e obtidas as imagens das raizes pelo método radiográfico digital e tomográfico. Um examinador calibrado interpretou, inicialmente as imagens radiográficas e após 7 dias as imagens tomográficas, ambas por meio do software específico. Após a primeira avaliação das imagens o examinador repetiu o procedimento com intervalo de duas semanas. A concordância intra-examinador foi estimada pelo teste Kappa. Resultados: Kappa de 0.84 foi obtido para as avaliações radiográficas e tomográficas. Os valores da sensibilidade e especificidade da TCFC foram, respectivamente, 73,8% e 70,5%, enquanto que para RPD foram 52,1% e 65,5%, comprovando que a TCFC é o método mais indicado para visualizar reabsorções radiculares. Conclusão: Ambos os métodos RPD e TCFC são eficazes na detecção de reabsorção radicular em molares decíduos, porém a TCFC apresenta maior acurácia diagnóstica.
Introduction: The aim of this study was to evaluate and compare the accuracy of digital periapical radiography (RPD) and cone beam CT (CBCT) in the detection of root resorption in deciduous molars. Methods: The sample consisted of 43 upper and lower molars with and without root resorption. These teeth were placed in a human dry skull and the images obtained from the roots by CT and digital radiographic method. A calibrated examiner interpreted initially radiographic images and 7 days after the tomographic images, both through specific software. After the first evaluation of the images the examiner repeated the procedure with an interval of two weeks. The intra-examiner was estimated by Kappa test. Results: Kappa value of 0.84 was obtained for radiographic and tomographic evaluations. The values of sensitivity and specificity of CBCT were respectively 73.8% and 70.5%, while for RPD was 52.1% and 65.5%, proving that CBCT is the best method to visualize root resorption . Conclusion: Both RPD and CBCT methods are effective in the detection of root resorption in deciduous molars, but CBCT has higher diagnostic accuracy.
46
DI, VECE LUCA. "A study into the clinical effects of the rapid palatal expansion." Doctoral thesis, Università di Siena, 2017. http://hdl.handle.net/11365/1022996.
Full textAbstract:
This thesis contains different studies on the effects of the rapid palatal expansion.The purpose of this thesis is to investigate some of the effects of palatal expansion which are still unaddressed in literature.
The first part of the thesis, after a brief introduction to the transverse maxillary contraction and palatal expansion, will outline the results of clinical trials that relate to the non-orthodontic effects that palatal expansion may have on: cervical vertebrae, posture and upper airways.The second part will show the first results, from an orthodontical point of view, of a multicentric randomized clinical trial designed to analyze the possible different effects of palatal expander anchored on deciduous or permanent teeth.
47
Šimek, Jiří. "Hodnocení pevnostních parametrů součástí vytvořených metodami rapid prototyping." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227979.
Full textAbstract:
This diploma thesis describes Rapid Prototyping methods. It introduces their overview, principles, advantages and disadvantages. This project also deals with aplication and comparison of modifications of samples made by Fused Deposition Modeling. Findings from tests of mechanical features (pulling test and bending test) are used for comparison.
48
Kassen, Daniel S. "Synthetic Aperture Radar: Rapid Detection of Target Motion in Matlab." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1398.
Full textAbstract:
Synthetic Aperture Radar (SAR) has come into widespread use in several civilian and military applications. The focus of this paper is the military application of imaging point targets captured by an airborne SAR platform. Using the traditional SAR method of determining target motion by analyzing the difference between subsequent images takes a relatively large amount of processing resources. Using methods in this thesis, target motion can be estimated before even a single image is obtained, reducing the amount of time and power used by a significantly large amount. This thesis builds on work done by Brain Zaharri and David So. Brain Zaharri successfully created a SAR simulation that accurately models the airborne SAR system capturing data of a target space using the Range Doppler Algorithm (RDA). David So extended this work by adding functionality to determine target velocity in the range and azimuth directions by processing the intermittent data created by the several steps of Brian Zaharri’s simulation. This thesis shows further extensions of processing the intermittent data using unique methods. The methods in this thesis successfully demonstrate the ability to quickly and accurately estimate target position, velocity, and acceleration without the need for using multiple SAR images. Target motion in the range direction is detected without using any part of the RDA, while the azimuth direction cuts out several steps, including the range compression phase and the range cell migration correction. Removing these unneeded processing steps dramatically decreases target motion data acquisition time. Both Brian Zaharri’s and David So’s work, along with this thesis, are part of the Cal Poly SAR Automatic Target Recognition (ATR) group of projects, which is sponsored by Raytheon Space & Airborne Systems Division. Because U.S. military SAR data remains classified, the Cal Poly SAR ATR projects addresses the need to educate researchers on the processing of SAR data.
49
Knoop, Benjamin Andreas [Verfasser], Steffen [Akademischer Betreuer] Paul, Steffen [Gutachter] Paul, and Andreas [Gutachter] Burg. "Rapid Digital Architecture Design of Computationally Complex Algorithms / Benjamin Andreas Knoop ; Gutachter: Steffen Paul, Andreas Burg ; Betreuer: Steffen Paul." Bremen : Staats- und Universitätsbibliothek Bremen, 2019. http://d-nb.info/1186248564/34.
Full text
50
Azevedo, Marco Antonio Diniz. "Método de desenvolvimento de reabsorções cervicais invasivas in vitro para estudos de imagens de radiografia digital e tomografia computadorizada de feixe cônico." Florianópolis, 2012. http://repositorio.ufsc.br/xmlui/handle/123456789/99248.
Full textAbstract:
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde. Programa de Pós-Graduação em OdontologiaMade available in DSpace on 2013-03-04T18:10:43Z (GMT). No. of bitstreams: 0
Esta pesquisa desenvolveu um protocolo in vitro que simula reabsorções cervicais invasivas (RCIs) em dentes humanos, para diagnóstico por meio de radiografia digital e tomografia computadorizada de feixe cônico (TCFC). Dezesseis dentes humanos hígidos foram distribuídos em quatro grupos, RCI1; RCI2; RCI3; RCI4. Após a secção longitudinal dos dentes foram realizadas cavidades com profundidades, extensões e limites irregulares, reproduzindo as RCIs nas classes 1, 2, 3 e 4, descritas por Heithersay. Após a colagem dos segmentos longitudinais, os dentes foram avaliados por meio de radiografia periapical digital (RPD) e tomografia computadorizada de feixe cônico (TCFC). As imagens obtidas foram comparadas por três observadores com imagens de três casos clínicos de RCIs, incisivo central superior, canino superior e molar inferior. As imagens obtidas por meio de RPD foram semelhantes às descritas por Heithersay, assim como as de TCFC quando comparadas às imagens dos casos clínicos. As RCIs in vitro realizadas pelo método proposto são reprodutíveis e representam as mesmas características de imagem das RCIs em radiografias periapicais digitais e de tomografia computadorizada de feixe cônico.
This research developed a protocol that simulates invasive cervical resorption (ICR) in human teeth, diagnostic by periapical radiography and cone beam CT (CBCT), to be reproducible and applicable in studies evaluating diagnostic imaging methods such resorption. Sixteen healthy human teeth were divided into four groups. These teeth were sectioned along its long axis and irregular cavities were created with diamond FG reproducing the ICRs classes 1, 2, 3 and 4 proposed by Heithersay. After bonding of longitudinal segments, the teeth were evaluated by means of digital periapical radiography (DPR) and Cone Beam CT (CBCT). The images obtained were compared with images of some clinical cases of ICR. Images obtained by DR and CBCT were similar to those described by Heithersay, as well as images of clinical cases. The in vitro ICRs held by the proposed method are reproducible and represent the radiographic and tomographic features of these lesions.