Dissertations / Theses on the topic 'Dbrl'
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Sherwood, Nicholas. "An IPsec Compatible Implementation of DBRA and IP-ABR." Digital WPI, 2005. https://digitalcommons.wpi.edu/etd-theses/738.
Full textBohlen, Brandon Scott. "PECVD grown DBR for microcavity OLED sensor." [Ames, Iowa : Iowa State University], 2007.
Find full textHorowitz, Luke. "Adaptation of VT-Dbr Lasers for LIDAR." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1902.
Full textHett, Anne. "Studies on the metabolism of retained and excised introns in human cells." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/10515.
Full textGupta, Meghana B. "Regulation of Dbl Family Guanine Nucleotide Exchange Factors." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1386175561.
Full textFedler, Fritz. "Herstellung hochreflektierender AlGaN-AlN-DBR- und UV-VCSEL-Strukturen mittels plasmaunterstützter Molekularstrahlepitaxie." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969335695.
Full textJULIO, Ricardo Emerson. "DBML: Uma Biblioteca de Gerenciamento Dinâmico de Banda para Sistemas Multirrobôs Baseado em ROS." reponame:Repositório Institucional da UNIFEI, 2015. http://repositorio.unifei.edu.br:8080/xmlui/handle/123456789/114.
Full textMade available in DSpace on 2015-10-09T14:25:52Z (GMT). No. of bitstreams: 1 dissertacao_julio_2015.pdf: 2228477 bytes, checksum: bdb709442550bbb325854408100d347b (MD5) Previous issue date: 2015-07
A comunicação é um componente importante em sistemas multirrobôs; a performance do sistema pode ser seriamente afetada quando o número de robôs do sistema ou o número de canais de comunicação aumenta. A Biblioteca de Gerenciamento Dinâmico de Banda (DBML - Dynamic Bandwidth Management Library) foi projetada de forma a maximizar a utilização da banda em sistemas multirrobôs. O sistema desenvolvido prioriza os canais de comunicação de acordo com eventos que ocorrem no ambiente oferecendo maior largura de banda para os canais de comunicação mais prioritários. A biblioteca foi desenvolvida utilizando o ROS (Robot Operating System) de forma a separar as funcionalidades em módulos independentes que possam ser reutilizados e melhorados em trabalhos futuros. Este trabalho apresenta a biblioteca desenvolvida utilizando um problema de otimização linear e um exemplo do uso da biblioteca em uma aplicação de teleoperação onde diversas simulações foram feitas. Os resultados mostraram que o DBML atribui uma maior frequência de envio de informações para os canais de comunicação mais prioritários, permitindo assim, uma maior eficiência na execução das tarefas.
Rupp, Stephanie. "Modellgeleitete Diagnostik bei kindlichen lexikalischen Störungen [ausgezeichnet mit dem dbl-Forschungspreis]." Idstein Schulz-Kirchner, 2005. http://d-nb.info/988054396/04.
Full textPozzi, Francesca. "InAlGaAs-InP laterally coupled DBR and DFB lasers for microwave generation." Thesis, University of Glasgow, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443408.
Full textSmilyanets, Sergey [Verfasser]. "Spieltheoretische Analyse eines Kampfes auf dem Ratingmarkt : Der Fall: DBRS gegen etablierte Ratingagenturen / Sergey Smilyanets." Aachen : Shaker, 2010. http://d-nb.info/1098042522/34.
Full textde, Moraes Rêgo Guedes Gabriela. "Efeitos da desnutrição protéica crônica sobre o córtex cerebral e evolução ponderal de ratos adultos." Universidade Federal de Pernambuco, 2009. https://repositorio.ufpe.br/handle/123456789/8583.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
Influências genéticas e ambientais atuam sobre o Sistema Nervoso Central (SNC) durante o processo de desenvolvimento. Uma nutrição adequada é essencial para a formação do SNC, organização funcional e para desenvolvimento do organismo. Estudos utilizando dietas semi-sintéticas foram desenvolvidos para reproduzir em animais de laboratório características clínicas, bioquímicas e patológicas, observadas em humanos desnutridos. A dieta básica regional (DBR) foi proposta para estudar a desnutrição característica dos habitantes de baixa renda da zona da mata de Pernambuco. O presente estudo avaliou o perfil morfológico (densidade e número de células neuronais) do córtex visual de ratos Wistar submetidos a dois tratamentos nutricionais: dieta padrão de biotério (Labina®, 23% de proteína) e dieta hipoprotéica (DBR, 8% de proteína), originando 6 grupos experimentais: N5, N7 e N9 - animais nutridos com Labina® durante 5º., 7º. e 9º. meses respectivamente, e D5, D7 e D9 - animais desnutridos por DBR durante os mesmos períodos. Após o tratamento nutricional, os animais foram sacrificados e os cérebros retirados, processados histologicamente e avaliados através de estudos morfométricos. Observou-se que a desnutrição induzida por DBR provocou uma redução significativa na massa corporal dos animais de todos os grupos. A redução foi decrescente ao longo da idade, pois aos 5 meses os animais DBR pesavam, em média, apenas 27,7% do peso total do animal normonutrido, aos 7 meses, 29,1% e por fim aos 9 meses os animais DBR pesavam cerca de 32% do peso dos normonutridos. A comparação feita entre os grupos mostrou que o peso cerebral também foi visivelmente reduzido nos animais desnutridos. A maior redução no peso cerebral ocorreu no grupo D9 onde a média do peso dos cérebros desse grupo correspondia a 81,55% do peso cerebral do grupo N9. Não houve diferença significativa em relação ao número de neurônios por campo e nem em relação à média da área do soma dos neurônios. Tais achados indicaram que a desnutrição induzida pela DBR no pós-desmame embora não cause alterações na citomorfologia do córtex cerebral tem repercussões sobre a evolução ponderal e encefálica
SANTOS, Ângela Amâncio dos. "Nutrição e sistemas serotoninérgico e nitrérgico: estudo morfo-funcional em ratos jovens e adultos." Universidade Federal de Pernambuco, 2006. https://repositorio.ufpe.br/handle/123456789/8830.
Full textEstudo Eletrofisiológico: Ratos Wistar foram injetados durante o período de lactação com fluoxetina, um inibidor seletivo da recaptação de serotonina (5, 10, 20, ou 40 mg/kg/d por via subcutânea) e o fenômeno da depressão alastrante da atividade elétrica cerebral (DA) foi registrado na superfície cortical desses animais imediatamente após o desmame (25-30 dias de vida). Em um grupo adicional (10 mg/kg) a DA foi registrada aos 60-70 dias. Quando comparada às duas condições controle (injeção com solução salina ou sem injeção - ingênuos ), a fluoxetina reduziu (P<0,05) a velocidade da DA nos ratos jovens de forma dose-dependente em 4%, 6%, 16% e 15%, respectivamente, e nos adultos em 13%. Em um outro experimento com ratos adultos, a aplicação tópica cortical de fluoxetina (5 e 10 mg/ml) sobre a dura-máter intacta, durante 10 min, reduziu a velocidade da DA de modo diretamente proporcional à concentração aplicada (reduções máximas de 7,6% e 43,3%; P<0,05). A propagação da DA foi bloqueada em 4 dos 14 ratos tratados topicamente com a concentração mais alta de fluoxetina (10 mg/ml). Este efeito tópico da fluoxetina foi revertido após lavagem, da região tratada, com solução salina. Em ratos precocemente desnutridos, a fluoxetina aplicada durante o período de aleitamento (10 mg/kg/d, s.c.) e topicamente (10 mg/ml) também reduziu (P<0.05) as velocidades da DA em 18 e 22% para o tratamento sistêmico (nos animais jovens e adultos, respectivamente) e em 22,4% para o tratamento tópico. Estudo Morfológico: Em ratos Wistar tratados precocemente com fluoxetina (10 mg/kg/d, s.c.) não houve modificações apreciáveis no número, nem na área do corpo celular de neurônios nicotinamida adenina dinucleotídeo fosfato-diaforase (NADPH-d) positivos, independentemente do estado nutricional. Neurogênese Hipocampal: A fluoxetina não alterou o número de células hipocampais positivas à bromodeoxiuridina (marcador de proliferação celular) em ratos Sprague- Dawley jovens ou adultos, submetidos ou não a uma condição de estresse. Conclusões: 1) A presente ação da fluoxetina suporta a hipótese de uma influência serotoninérgica antagônica sobre a DA; 2) A desnutrição precoce não impede os efeitos da fluoxetina; 3) A neurogênese hipocampal, bem como as células NADPH-d-positivas (que são produtoras de óxido nítrico) parecem ser resistentes ao tratamento precoce com esse inibidor seletivo da recaptação de serotonina
Chiccone, Christopher Louis. "Automated SG-DBR Tunable Laser Calibration Optimized for Optical Coherence Tomography Applications." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/519.
Full textLi, Xin. "Lasers à cavité vertical émettant par la surface dans l’ultraviolet profond à base des matériaux BAlGaN." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0243/document.
Full textThe context of this thesis falls in the wide applications of UV light sources such as sterilization and purification. Compared to the conventional UV sources (excimer lasers, Nd: YAG lasers or mercury lamps), the semiconductor devices have advantages in reliability, compactness, high efficiency and minimum environmental effects. On the material aspect, III-nitrides (BAlGaInN) are promising candidates since they are chemically and physically stable with direct bandgaps covering from visible to DUV spectrum. On the structure aspect, vertical-cavity surface-emitting laser (VCSEL) is one of the most attractive configurations considering its low threshold, high efficiency, and the possibility for the integration of 2D arrays and the wafer-level tests. It constitutes a multiple-quantum-well (MQW) active region sandwiched by a top and a bottom distributed Bragg reflector (DBR). However, no VCSELs can operate below 300 nm until now. The major challenges lie in the two main blocks: the emission efficiency of MQWs and the reflectivity of DBRs, which are limited by the quality of the substrates and epitaxial layers, optical-polarization properties of the MQW emission, small refractive index contrast of the layers used for DBRs at short wavelengths, etc. The objective of this thesis is to address this need by studying metal-organic vapor-phase epitaxy (MOVPE) growth of BAlGaN materials, developing AlGaN MQWs with enhanced surface emission and exploring BAlN/AlGaN DBRs, for the future development of optically-pumped VCSELs operating below 300 nm
Abid, Mohamed. "Design and epitaxial growth of vertical cavity surface-emitting lasers (VCSEL) emitting at ultraviolet wavelength." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47682.
Full textRiehn, Eric J. [Verfasser]. "Photokathoden mit internem DBR-Reflektor als Quellen hochintensiver spinpolarisierter Elektronenstrahlen / Eric J. Riehn." Mainz : Universitätsbibliothek Mainz, 2011. http://d-nb.info/1031800050/34.
Full textGilbert, David Wilkey. "Point-Spread Function Assessment of SG-DBR Based Swept Source for OCT Imaging." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/733.
Full textSvensson, Alexandra. "En studie över förekomsten av genuttryck för enzym i biosyntesen av malarialäkemedlet artemisinin hos Artemisia vulgaris och Artemisia absinthium." Thesis, Linnéuniversitetet, Institutionen för kemi och biomedicin (KOB), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-35332.
Full textMalaria is a tropical disease that accounts for the death of many people annually and is caused by a parasite called Plasmodium. The World Health Organization (WHO) recommends artemisinin and its derivates for malaria treatment. Artemisinin is synthesized generally in Artemisia annua in small amounts. The artemisinin-treatment is very expensive due to the small amounts produced in the plant. Since the parasite has developed resistance towards many antimalarial drugs, artemisinin is an important drug against malaria. Research to find alternative methods for artemisinin-production has begun because there is a great concern that artemisinin-production at current rate will not meet the demand from the pharmaceutical industry. Some speculate if artemisinin can be synthesized in other plants from the Artemisia-genus since many plants have shown healing properties towards other diseases. In this study, we investigated if A. vulgaris and A. absinthium could produce artemisinin. Using molecular biology techniques, genetic material was isolated from the plants. Ribonucleotide (RNA)- and deoxyribonucleotide (DNA)- sequences which encode important enzymes in the artemisinin biosynthesis were examined. In case all the genes were expressed, artemisinin may be synthesized. The plants were picked on Revsudden, Sweden and genetic material was isolated. The presence of gene expression of five important enzymes in the artemisinin biosynthesis was investigated by Polymerase Chain Reaction (PCR). The results showed that the plants had gene expression of two respectively three of the five enzymes. Due to the fact that the plants need all five enzymes to synthesize artemisinin, even though a recent study has shown presence of artemisinin in these plants, this study concludes that artemisinin cannot be synthesized in A. vulgaris and A. absinthium.
Bashir, Babar. "Designing of High Reflectance Distributed Bragg reflectors (DBRs),mirrors using AlGaInN material system in the UV wavelength range." Thesis, University of Gävle, Ämnesavdelningen för elektronik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-5423.
Full textFriebel, Andrea. "Substratspezifität der nicht-dbl-homologen G-Nukleotid-Austauschfaktoren SopE und SopE2 aus Salmonella typhimurium." Diss., lmu, 2002. http://nbn-resolving.de/urn:nbn:de:bvb:19-1066.
Full textCesar, Julijan [Verfasser], Thomas [Akademischer Betreuer] Kusserow, and Stefan [Akademischer Betreuer] Sinzinger. "SiOx-SiCz MEMS-DBR-Based Tunable Optical Devices / Julijan Cesar ; Thomas Kusserow, Stefan Sinzinger." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1219656070/34.
Full textCesar, Julijan Verfasser], Thomas [Akademischer Betreuer] [Kusserow, and Stefan [Akademischer Betreuer] Sinzinger. "SiOx-SiCz MEMS-DBR-Based Tunable Optical Devices / Julijan Cesar ; Thomas Kusserow, Stefan Sinzinger." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://nbn-resolving.de/urn:nbn:de:tuda-tuprints-135633.
Full textDurel, Jocelyn. "Intégration d’un laser hybride DBR III-V/Si en face arrière d’une puce photonique." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT026/document.
Full textRecently, Silicon Photonics has emerged as a solution for the mass manufacturing of optical transceivers addressing datacenter’s needs in terms of increasing data-rate and reduced cost. Several Silicon-Photonics platforms have been demonstrated using standard Si technology. While these platforms differ in many regards, they all lack a solution for a monolithically integrated light source. To solve this problem, the most commonly proposed approach consists in bonding an InP-stack onto a Si-wafer in order to fabricate a Hybrid III-V/Si laser. However, none of those demonstrations have been made with a standard CMOS-BEOL, preventing a proper electronic-photonic integration. To solve the topographical problem induced by the additional layers, a new integration scheme, called Back-Side, has been developed and is presented in this document.First, the context of this study, a state of the art as well as the presentation of the Back-Side is discussed. The innovation brought by this integration, namely the bonding of the III-V on the back side of the SOI after the structuring of the latter, is then detailed.The correct behavior of a key element to the photonic chip, the grating coupler, is then treated through simulations, fabrication and optical characterizations. We have proved that, under specific conditions, this device has the same measured performances in Back-Side and in Front-Side.The principle of an optical oscillator and then the various modules composing the hybrid laser are then detailed. The implemented laser is based on a hybrid DBR (Distributed Bragg Reflector) III-V/Si cavity. In order to increase the mode confinement in the MQWS (Multi Quantum Wells) and hence ensure a high optical gain, the optical mode is gradually transferred between the III-V waveguide and the silicon waveguide of the hybrid laser by adiabatic tapers, patterned on both sides of the gain zone, to finally be reflected by the mirrors DBR in the silicon.Finally, its manufacturing process is explained before its opto-electronic characterizations are presented. The electrically pumped lasers have been tested under continuous-wave current conditions and the generated light has been collected through the grating coupler to a multi-mode fiber. The fiber coupling losses has been measured to be higher than 10 dB. The output power is up to 1.15 mW at an injection current of 200 mA. The lasing threshold is 45 mA which corresponds to a current density of 1.5 kA/cm2 and the series resistance of the laser contacts is approximately 9 . The threshold voltage is 1.45 V.The laser spectra reflect its single-wavelength laser operation, for different injection currents, with a central wavelength corresponding to the Bragg wavelength of the mirrors. A Side Mode Suppression Ratio (SMSR) of more than 35 dB has been measured. A 4 nm wavelength shift has been observed when injecting 20 mA into both metallic heaters above DBRs.The monolithic integration of a fully CMOS compatible hybrid DBR laser on the backside of a SOI wafer being demonstrated for the first time, implementing CMOS compatible electric interconnects and optical sources on a same chip has could be achieved. This device opens the route to a fully integrated optical transceiver on a Si platform
Bernacil, Michael A. "Microwave Signal Generation Using Self-Heterodyning of a Fast Wavelength Switching SG-DBR Laser." DigitalCommons@CalPoly, 2008. https://digitalcommons.calpoly.edu/theses/19.
Full textChhatriwala, Mariya Khuzem Sondek John E. "Defining diverse mechanisms that regulate the activity of Dbl-family guanine nucleotide exchange factors." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,1494.
Full textTitle from electronic title page (viewed Sep. 16, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Pharmacology." Discipline: Pharmacology; Department/School: Medicine.
Ruppik, Stefan [Verfasser]. "Zeitvariante optisch induzierte DBR-Filter auf halbleiterbasierten Koplanarleitungen für den Mikro- und Millimeterwellenbereich / Stefan Ruppik." Hamburg : Helmut-Schmidt-Universität, Bibliothek, 2012. http://d-nb.info/1018559930/34.
Full textDurand, Fábio Renan. "Projeto e modelagem de um filtro para retirada de comprimentos de onda utilizando duplo refletor de Bragg e guias ARROW em fibras tipo-D para aplicações em WDM." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-08032016-115713/.
Full textThe progress in lightwave propagation based on optical fibers has provided our society with an unprecedented communication capability. The deregulation of public telephone companies together with the increasingly popularity of the internet can be pointed out as the major contributors for this huge bandwidth demand we experience today. Additionally, there was a corresponding growth in traffic volume due to wideband multimedia services. As a consequence of this fast growing demand for bandwidth in a global scale, telecom companies have accelerated the development and implementation of optical communication networks based on wavelength division multiplexing (WDM) technology. The tendency in terms of network evolution is to approximate the optical fibers as close as possible to the end user. The most economically viable way of doing so is by way of the so called Passive Optical Networks (PON) based on WDM systems. This type of network is flexible enough to support broadcast, where the same signal is distributed to all users, and point-to-point services. If more capacity is required for these systems, this can be achieved just by adding new channels (wavelengths) to it. Another important issue regarding WDM systems consists in the extraction of channels from the optical network, which can be achieved by using highly selective dropping filters such as the one proposed in this work. This filter is defined by the combination of three distinct structures defining one single device: a d-type fiber, a double Bragg reflector (DBR), and a multilayer ARROW type waveguide (Antiresonant Reflecting Optical Waveguide). The DBR is defined beforehand on the d-fiber, and then the d-fiber is literally glued on top of the multilayer waveguide. This multilayer waveguide is fabricated directly atop of a p-i-n photodetector in such a way that the three structures (d-fiber, multilayer waveguide and photodetector) now form a rigid structure. The ARROW type configuration for the multilayer waveguide and the DBR structure are chosen by virtue of their wavelength selectivity characteristics, helping to improve the device performance. The d-fiber structure, by its tum, has the great advantage of reducing drastically the insertion loss when compared to rectangular waveguide filters. In the analysis provided in this work parameters such as layer thicknesses, refractive indices, insertion loss, channel isolation, etc, and their influence on the device performance, are extensively investigated for optimization purposes. The simulated results are discussed thoroughly and an optimal structure configuration is proposed.
de, Assis Marques Santos Francisco. "Efeito da desnutrição pós-natal com DBR (Dieta Básica Regional) sobre a morfometria testicular e o processo espermatogênico de ratos adultos." Universidade Federal de Pernambuco, 2008. https://repositorio.ufpe.br/handle/123456789/8319.
Full textObjetivamos investigar o efeito da desnutrição materna durante a lactação, com a Dieta Básica Regional (DBR), no testículo de ratos, através de análises quantitativa e qualitativas. Ratas Wistar acasaladas aos 3 meses de idade receberam ração normoprotéica até o nascimento dos seus filhotes. Os filhotes foram divididos em dois grupos: controle C (n=6), com água e dieta normoprotéica; e desnutrido D (n=6), com água e dieta multicarencial (DBR); dada às mães, lactantes. Após o desmame, os grupos foram mantidos com água e dieta padrão do biotério (Labina-Purina), ad libitum até a eutanásia aos 3 meses de vida quando foram pesados, anestesiados, perfundidos com paraformaldeído a 4% em tampão fosfato (0,05M - pH 7,4) e orquiectomizados. O índice gonadossomático (IGS) foi estabelecido a partir da razão entre os pesos testiculares e corporal, obtidos no dia da eutanásia. Os testículos foram incluídos em parafina, processados histologicamente e corados com hematoxilina e eosina, depois analisados em microscópio de campo claro. Os pesos corporal (PC) e testicular (PT) do grupo desnutrido (324±6g; 1,67±0,05g) não diferiram dos pesos corporal e testicular do grupo controle (303±10g; 1,67±0,03g). Já o índice gonadossomático (IGS) do grupo desnutrido (1,11%) foi significativamente maior (p=0,021) do que o IGS do grupo controle (1,04%). O diâmetro tubular (DT) do grupo desnutrido (300±3μm) foi semelhante ao grupo controle (295±2μm), da mesma forma o comprimento do túbulo seminífero por testículo (CTS) do grupo desnutrido (16,9±0,7m) foi próximo do CTS do grupo controle (18±1,7m), ou seja, não houve diferença estatística significativa (p>0,05). Entretanto a altura do epitélio seminífero (AES) do grupo desnutrido (74±2μm) foi estatisticamente menor (p<0,05) do que a AES do grupo controle (82±3μm). A proporção de túbulos seminíferos foi menor (p<0,05) no D(84,0%) em relação ao C(81,7%). Houve redução de 48,8% no número de células de Sertoli por testículo do D (2,1±0,3 x107) em relação ao C(4,1±0,8 x107) (p<0,05). Os resultados sugerem que a desnutrição pós-natal com DBR em ratos adultos jovens, promoveu modificações significativas nos testículos, com ênfase na programação do número de células de Sertoli, no animal adulto, o que pode levar a alteração no processo espermatogênico e na produção espermática
Bernacil, Michael A. Derickson Dennis. "Microwave signal generation using self-heterodyning of a fast wavelength switching SG-DBR laser : a thesis /." [San Luis Obispo, Calif. : California Polytechnic State University], 2008. http://digitalcommons.calpoly.edu/theses/19/.
Full textMajor professor: Dennis Derickson, Ph.D. "Presented to the faculty of California Polytechnic State University, San Luis Obispo." "In partial fulfillment of the requirements for the degree [of] Master of Science in Electrical Engineering." "May 2008." Includes bibliographical references (leaves 147-149). Also available on microfiche (3 sheets).
Govoni, Humberto. "Análise de estratégias de melhorias de recursos produtivos em ambientes MTS gerenciados pelo método S-DBR /." Bauru, 2018. http://hdl.handle.net/11449/180542.
Full textBanca: Silvio Roberto Ignacio Pires
Banca: Jose de Souza Rodrigues
Resumo: A análise do comportamento do fluxo das ordens de produção e dos recursos que compõem um sistema produtivo oferece um indicativo de onde se deve atuar para melhorar este sistema. A Teoria das Restrições (Theory of Constraints - TOC) indica três métodos de focalização de melhorias de recursos produtivos que impactam globalmente o sistema. Este trabalho busca avaliar o desempenho de cinco métodos de melhoria, incluindo os indicados pela TOC, em um ambiente de produção para estoque (make-to-stock - MTS) utilizando-se de simulação computacional. Para isto, estas abordagens são simuladas em seis configurações de linha de produção e o desempenho é medido em termos de Tempo de Ciclo (Cycle Time - CT) e Taxa de Preenchimento de Pedidos (Fill Rate - FR). Os resultados indicam que, em sistemas balanceados, a melhor abordagem de melhoria a ser utilizada é a que atua em todos os recursos simultaneamente. Em ambientes desbalanceados, por outro lado, é necessário utilizar um método que foca melhorias em um único recurso, como o método de nível de ocupação, estoque em processo ou Buffer Management. Neste caso, a focalização pelo nível de ocupação da máquina trouxe mais benefícios ao sistema.
Abstract: A behavioral analysis of the flow of production orders and resources that form a production system provides an indication of where to improve this system. The Theory of Constraints (TOC) suggests three approaches for identifying and improving resource constraints aiming to entirely affect the system: based on the largest queue of work-in-progress, the highest utilization level, and using the buffer management method. This study aims to assess the performance of these approaches comparing them with each other and with two others: dispersed improvements in all the resources and random improvements. Data was taken and analyzed from a simulated make-to-stock (MTS) environment, managed using the Simplified Drum Buffer Rope (S-DBR) method. For this, each improvement approach is simulated in six production line configurations and performance is measured in terms of Cycle Time (CT) and Fill Rate (FR). The results indicate that, in balanced systems, scattered improvements in all resources allowed better results than all three approaches recommended by TOC. In unbalanced environments, on the other hand, the focus on occupancy level exceeded all the other four approaches assessed.
Mestre
Bahari, Aireen Aina Binti. "The implementation of dialogue-based pedagogy to improve written argumentation amongst secondary school students in Malaysia." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34992.
Full textTapanes, Marie A. "Revision And Validation Of A Culturally-Adapted Online Instructional Module Using Edmundson's CAP Model: A DBR Study." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3376.
Full textYoshizawa, Masato. "Dynamic and coordinated expression profiles of Dbl-family guanine nucleotide exchange factors in the developing mouse brain." Kyoto University, 2005. http://hdl.handle.net/2433/144747.
Full textTalkington, Desmond Charles. "Characterization and Modeling of an O-Band 1310 nm Sampled-Grating Distributed Bragg Reflector (SG-DBR) Laser for Optical Coherence Tomography (OCT) Applications." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/983.
Full textDuarte, Carlos Henrique Azevedo. "Programação da descarga de navios graneleiros de carvão: um estudo de caso na Companhia Siderúrgica do Pecém." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3136/tde-20092018-105541/.
Full textAccording to Babu et al. (2015), coal is an important natural resource due to its application in various economic activities, such as power generation, steel production, cement manufacturing and liquid fuel production. Due to the cost and low quality of Brazilian coal (not coking, in most reserves, with high ash content and low calorific value), as pointed out by Süffert (1997), Brazilian companies in the steel and thermoelectric sectors need to import this input, by sea. The challenge in planning the logistics of supply of this raw material is to guarantee the supply at the minimum cost of inventory and waiting of the ships. The supply guarantee is subject to adequate scheduling of arrival and unloading of ships. When ship unloading is a bottleneck operation, greater care is required with the scheduling of receipt, so that there are no delays, which cause the lack of product, or in much anticipation, that can mean excessive queue time for receiving the shipment material for lack of storage area. In order to properly program, the arrival of ships, in order to avoid very large queues and shortage, a model for the arrival of ships was proposed, based on data from the Pecém complex. This proposed model used a pre-determined time buffer, which was tested and validated through simulation, in order to minimize the delays, so that they can be absorved by a security stock, and the anticipations, so that there is no risk lack of storage area.
Alghanmi, Sahar. "a"It was a dream, and it happens" : Saudi academics' discursive construction of blended learning integration : CHAT-inspired DBR." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/ait-was-a-dream-and-it-happensa-saudi-academicsa-discursive-construction-of-blended-learning-integration-chatinspired-dbr(d2c392ea-e98b-4412-b20c-940092a8e113).html.
Full textBozorgui, Shirin. "Modelisation des lasers semiconducteurs a reflecteur de bragg (dbr) : analyse des effets thermiques et du reseau a pas variable." Paris 11, 1997. http://www.theses.fr/1997PA112316.
Full textEjemyr, Christoffer. "Modeling a Tunable Narrow Linewidth Laser." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-275689.
Full textSu, Chien-Chen, and 蘇乾禎. "Congestion-Driven Floorplan on DBL Representation." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/31823566479877559331.
Full text中華大學
資訊工程學系碩士班
92
As VLSI technology reaches deep-sub micron dimensions and the application of SoC (System-on-Chip) design is general, the scale of VLSI circuit becomes more complex. A traditional area-driven floorplan become less important because of the decrease in cost of chip area. In floorplan stage, it is necessary for a successful chip design to develop an effective congestion analysis before global routing base on floorplan or placement information. To deal with multi-objective floorplan issue, we proposed double-bound-list (DBL) representation. DBL representation is more advanced than other representations (Ex. sequence pair, O-tree and B*-tree) and conform to the property of P-admissible because we can find out the total area and the adjacent relation between blocks with less memory. We also proposed hierarchical stair contour as our data structure to record the contour of floorplan and reduce the time complexity of data searching. In order to handle routability problem efficiently, hierarchical quad-grid model is proposed to estimate congestion. Quid-grid partition depend on wire density to avoid less accurate and more timing-consuming in 2-D static uniform grid-based model. A floorplan with congestion estimation before routing stage can reduce time complexity of routing procedure. The experimental results show that the method we proposed can decrease routing congestion with a few penalties for chip area.
廖祥智. "Multiobjective-Driven Floorplan on DBL Representation." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/10274946301721304758.
Full text中華大學
資訊工程學系碩士班
91
Due to the coming of new system-on-chip (SoC) age, silicon-intellectual- property (SIP) modules become popular for modern chip design. Since SIP modules in one chip have provided by different companies or departments, it is very important for the development of SoC chip to integrate all the SIP modules into a single chip. On the other hand, to deal with the increasing complexity and various requirements of including chip performance, low power …etc of circuit, it also makes one floorplan to become more critical than even. However, an effective better floorplan approach depends on the data representation of floorplans, the estimation of cost function, and the development of floorplan improvement approach. In this paper, we discuss how to solve the non-slicing floorplan problem for multiple objectives. We use one data representation, named double -bound-list (DBL) for non-slicing floorplans. The DBL representation combines the advantages of representative popular representations such as sequence pair, O-tree and B*-tree. From the structure of the DBL representation, the floorplan area and the geometric adjacent relationship can be immediately found. In addition, the DBL representation uses less memory for the storage of one non-slicing floorplan. Now, there is not only the discussion of area requirement discussion for the non-slicing floorplan problem, but also the discussion of the high performance requirement, maximum routability requirement … etc. Especially, for routability requirement, there is more difficulty to guarantee the routabililty property in the routing phase due to the increasing complexity of net connections in circuit design. Based on the combination of multiple critical objectives, it takes much time to search optimal non-slicing floorplan results. Therefore, we use a data structure, named Hierarchical Stair Contour (HSC), to store the contour of an incremental floorplan, and improve the search efficiency. Finally, we develop a simulated-annealing-based floorplan approach on the proposed DBL and HSC data structure to obtain a final non-slicing floorpaln result. The experimental results show that the proposed approach can obtain better multiobjective floorplan results.
Tsai, Hong-Chang, and 蔡宏璋. "Cascaded Distributed-Bragg-Reflectors (DBRs) for Narrow-band Optical Filter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/08587481103451166546.
Full text國立交通大學
電子物理系
91
In this thesis, we propose a method to achieve a narrow band-pass optical filter using cascaded Distributed-Bragg-Reflectors (DBRs) and optical cavity, which construct a Fabry-Perot-like interferometry. Firstly, we analyze the traditional thin-film coating multi-layer optical filter by the use of transfer matrix method. The results can give us a guide how to design an optical narrow band-pass filter with nearly rectangular transmission spectrum. Secondly, by using the coupled-wave analyses of a volume hologram, we derive the scattering matrix method to analyses the diffraction properties of a reflection-type volume hologram. It provides us an extended matrix method to investigate the transmission characteristics of different cascaded structures of the volume holographic gratings. In experiment, we use PQ/PMMA photopolymer to fabricate volume holographic reflection-type gratings, and then the resonance cavities are fabricated by using thermal coating of MgF2 thin film. The theoretical and experimental results show that it is possible to achieve a narrow band-pass optical filter by using cascaded volume holographic gratings. However, the grating length, cascading structure and optical resonance cavity length must be chosen carefully such that the phase condition of Fabry-Perot-like structure can be matched.
Ping-Yu, Kuei, and 桂平宇. "Studies on Characteristics of Selectively Oxidized and Ion Implanted AlGaAs DBRs." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/44662512495791779051.
Full text國防大學中正理工學院
國防科學研究所
91
We discuss the effects of lateral wet oxidation and ion implantation on AlGaAs DBRs. The AlxGa1-xAs oxide is stable, amorphous, solid-phase (AlxGa1-x)2O3. For AlxGa1-xAs layers embedded in multi-layer structure, a stable oxidation process is achieved by precisely control the flow rate of carrier gas, oxidation temperature and oxidation period, the thickness of AlxGa1-xAs layers, etc. The oxidation rate of the DBR implanted with oxygen ions will be enhanced at the temperature range of 350~450℃. We thought the enhanced oxidation rate is dominantly resulted from the change of surface energy or strain between oxide layers and epi-layers. In addition, for the DBRs implanted with hydrogen, oxygen, silicon, or phosphorous ions, respectively, the central wavelength of reflectivity spectra will shift toward longer wavelength and the background reflectance is increased. According to our calculation and discussions, those are related to inter-diffusion of aluminum atoms in DBR. Finally, for the surface-emitting LED or RCLED with DBR structure, its optoelectronic properties are improved by additional process of lateral wet oxidation or ion implantation.
Yu-ChenLiu and 劉佑章. "An S-DBR Method for Dynamic Production System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/61003210707668311243.
Full text國立成功大學
工程科學系專班
99
In the make-to-order factories, operations scheduling is the core work of the production management. Especially in the metal processing industry, companies often face the uncertain processing capacity in the production process, operations scheduling becomes even more complicated and the ERP and the SCM systems usually cannot effectively keep the overall performance stable. Most studies on operations scheduling base their scheduling on fixed-premise machine outputs, which cannot meet the characteristics of such dynamic production systems. This study uses the Theory of Constraint and the Simplified Drum-Buffer-Rope method to develop an Advanced Planning and Scheduling system- APS, which strengthens the delivery forecast model and dynamically adjusts the production buffers to achieve more precise delivery date prediction for dynamic production systems. Verified by the actual operations of the metal processing industry, the APS is proved suitable for dynamic production environments. It improves the scheduling operation to response to the market demand and also strengthens the ability of production system adjustments in order to guarantee precise delivery dates and to maintain factory competitiveness.
Chen, Jen-jy, and 陳正智. "Temperature-Constrained Thermal-Driven Floorplan on DBL Representation." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/59331898607652134260.
Full text中華大學
資訊工程學系碩士班
92
The development of the digit circuits in recent years has already entered into the ultra large-scale integrated circuit (ULSI) and System-on-Chip (SoC) era. The design of the chip becomes more and more complicated. In order to solve increased complexity, the concept of the silicon intellectual property (SIP) modules be extensively used. Hence, the SIP modules might be designed by a lot of different companies or offered with different departments. So, the companies which develop SIP modules can make good at their development and verification of products up to the best chip operation. Good modules may form better merger chip under the state of the optimization. In addition, the circuit design becomes complicated and the function diversification of customer's demand (such as high efficiency, the low power, etc.) causes the entire IC design flow to become to need long time to finish it. Hence, an effective better floorplan approach which depends on the good data representation of floorplans, the estimation of cost function, and the sampling of process improvement becomes more and more important. In this paper, we discuss how to reduce the temperature in a floorplan. Based on the DBL representation, we propose one Temperature-Driven floorplan, named Temperature-Constrained Thermal-Driven Floorplan on DBL Representation. The DBL representation combines the advantages of representative popular representation, such as Sequence Pair, O-tree and B*-tree. The data structure of the DBL representation which accords with the demand for P-admissible characteristic, can take polynomial time to get the adjacent relations between any pair of modules, and only need to use less memory for the storage of one floorplan. Now, there is not only the discussion of the area requirement for the floorplan problem, but also the discussion of the high efficiency requirement, maximum routability requirement, hot-spot distribution…etc. Under using less area and higher density of packaging, the increasing power consumption will lead to the rising temperature. So, we can prevent from overheated temperature to cause burning or abnormal operation on one chip. By using we proposed SA-based Temperature-Constrained Thermal-Driven Floorplan on DBL Representation, the experimental results shows that our approach reduce the chip temperature and with less storage.
Chou, Chien-Hsin, and 周見新. "Research on Line Design under the DBR System." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/63476544419541358871.
Full text國立交通大學
工業工程與管理系
91
The purpose of this paper is to compare the benefits of two ways of production line design. One is traditional capacity balance design, and the other is DBR(Drum-Buffer-Rope, DBR)ramp-up protective capacity design. A good manufacturing system is enable to reduce production cycle time and raises the reliability of due day. In order to reach the objectives, manufacturing system must overcome the effects of various variable events, random fluctuation on production line, and minimum of the production cost as well. In view of the foregoing, traditional production system pursues capacity balance and places work-in-process (WIP) inventory in front of every machines to protect overall line, which will lead to production cycle time raise and lower the reliability of due day. Meanwhile, the DBR production system pursues flow balance and ramp-up capacity to protect overall line, ramp-up capacity investment will change by line bottleneck’s location. In general, ramp-up capacity investment will greater than traditional capacity balance, but it will show good results in lowering WIP, cycle time, and due day. As to the results, how many the benefits will be? In order to answer the benefits, this research builds a simulation production line (DBR and traditional system) with EM-Plant software to simulate and analyze the results of both production line design concepts. It shows that the DBR system gets better results than traditional system as a whole.
張志輝. "DBR-based Scheduling for Dual Capacity Constrained Resources." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/83864998820107494758.
Full textCesar, Julijan. "SiOx-SiCz MEMS-DBR-Based Tunable Optical Devices." Phd thesis, 2020. https://tuprints.ulb.tu-darmstadt.de/13563/1/2020-09-24_Cesar_Julijan.pdf.
Full textChen, Chun-yin, and 陳春源. "The Effect of Various Environment on S-DBR." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/53127853956240929640.
Full text國立交通大學
工業工程與管理系所
97
The purpose of this thesis is to examine and attempt to prove a combination of Dr Goldratt’s theories on Touch Time and Due Date concepts. In 2006,in his Strategy & Tactic Tree, Dr.Goldratt (Eliyahu M. Goldratt) brought up that S-DBR and Buffer Management could possibly provide better reliability. He also focused on Due Date Performance(DDP) for products in many factories . In 2008, in his Standing On The Shoulders Of Giants, he raised an important hypothesis. He suggested that using Drum-Buffer-Rope(DBR) , Touch Time should be decreased by about 10% compared to Quoted Lead Time(QLT) . This research has tried to combine Dr.Godratt’s two hypothesis by using both reasoning and simulation in order to get a good view of the process. It should be noted that this is the first time a thesis combines both of Dr Goldratt’s hypothesis. . The results of my experiments have indeed indicated that the combination of both could make it easier for the orders to be finished on time in a more effective way. In conclusion, this research points out the feasibility of the combination of both methods as well as the practical applications to a factory using this innovative approach.
Lin, Y. C., and 林裕承. "Study the Application of DBR in GaN LEDs." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/03279556080677983046.
Full text大葉大學
電機工程學系
98
Due to the mature of epitaxy and process technologies, the application of nitride-based LEDs becomes more extensive. In order to improve the junction temperature and reduce the shading effect of electrodes, the flip-chip technology for LED package was also proposed and developed. The light will emit from substrate side surface for flip-chip packaged LEDs. The output intensity can be further enhanced if a reflector is deposited on the top surface of LEDs. In this thesis we have deposited a distributed Bragg reflector (DBR) on the top surface of LEDs to improve the output light intensity. The DBR is composed of SiO2 and TiO2. The reflectivity and transmittance were measured for the DBR samples with different pairs. From the measured results, a reflectivity of 91% at wavelength range of 450 ~ 470 nm was obtained from the DBR samples with 7.5 pairs. The light intensity emitted from top surface of the LED with DBR was reduced about 82%. Oppositely, the light intensity emitted from substrate side surface was enhanced about 30%.
Chang, Jia-Ging, and 張家鈞. "Enhancing the Application of S-DBR within MTO Environment." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/995gee.
Full text國立交通大學
工業工程與管理系所
96
In 2000, Eli Schragenheim and H. William Dettmer raised the idea of Simplified Drum-Buffer-Rope (S-DBR). They claimed that the market demand was the constraint of production system. They considered that there was no need to do the capacity constrained resource (CCR) scheduling if we could obey the CCR’s Planned Load (PL), which included well-organized confirm orders, release orders and priority management. That would make production management become easier. After developing and practicing for six or seven years, Schragenheim brought up the implementation of S-DBR more practically in 2006. He also pointed out that S-DBR still kept the advantages of DBR, and it could satisfy the Due Date Performance (DDP) at the same time. In this way, this research tried to verify Schragenheim’s assumption originally by reasoning, Job Shop game and simulation. The result showed that S-DBR could make the orders finished in time effectively. However, there are other production environments practically. In order to make sure the feasibility of S-DBR and figure out some doubts on S-DBR, this research discussed five issues further; inclusive of (1) the position of CCR’s influence on due-date among manufacturing process, (2) the influence of CCR drift, (3) batching, (4) order inserting, and (5) reentry flow environment. Furthermore, to enhance the protection and competency on due-date of S-DBR, this research also raised some ways to reinforce the ability of S-DBR when facing the variety of market demand and production environment.