Дисертації з теми "Optical design technique"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Optical design technique".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Sunay, Ahmet Sertac. "Analysis And Design Of Passive Microwave And Optical Devices Using The Multimode Interference Technique." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606456/index.pdf.
Повний текст джерелаMultimode Interference Mechanism"
are carried out. The MMI approach is used to analyze overmoded '
rectangular metallic'
and '
dielectric slab'
type of waveguides and devices. The application of the MMI technique is investigated experimentally by using a metallic waveguide structure operating in the X-band. The construction of the related structure and the related experimental work are reported.
Mital, Rashmi. "Design and demonstration of a novel optical true time delay technique using polynomial cells based on white cells." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1111161542.
Повний текст джерелаTitle from first page of PDF file. Document formatted into pages; contains xiii, 195 p.; also includes graphics (some col.) Includes bibliographical references (p. 190-195). Available online via OhioLINK's ETD Center
Barutcu, Burcu. "The Design And Production Of Interference Edge Filters With Plasma Ion Assisted Deposition Technique For A Space Camera." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614574/index.pdf.
Повний текст джерелаBignell, Allan M. "Photonic bus and photonic mesh networks : design techniques in extremely high speed networks /." *McMaster only, 1997.
Знайти повний текст джерелаMuretto, Giovanni <1976>. "Design and control techniques of optical networks." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/403/1/Tesidott.pdf.
Повний текст джерелаMuretto, Giovanni <1976>. "Design and control techniques of optical networks." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/403/.
Повний текст джерелаFeng, Ning-Ning Huang Wei-Ping. "Modeling, simulation and design techniques for high-density complex photonic integrated devices and circuits." *McMaster only, 2005.
Знайти повний текст джерелаDale, Brian M. "Optimal Design of MR Image Acquisition Techniques." Case Western Reserve University School of Graduate Studies / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=case1081556784.
Повний текст джерелаLuís, Ruben Soares. "Design and optimization of optical routing techniques and devices." Doctoral thesis, Universidade de Aveiro, 2007. http://hdl.handle.net/10773/2212.
Повний текст джерелаEste trabalho apresenta três estudos principais acerca do desenvolvimento e aplicação de sistemas de monitorização óptica avançados com base na análise de histogramas assíncronos, conversão de comprimento de onda de sinais de débito elevado e o impacto das não-linearidades das fibra ópticas em sistemas utilizando técnicas avançadas de transmissão. Mostra-se que a comparação de histogramas assíncronos com histogramas de referência pode ser usada para extrair informação a respeito da qualidade e do ruído que afecta o sinal em análise. O método proposto é validado através de simulação numérica e experiência. Um modelo analítico para a computação das limitações em frequência da modulação cruzada de fase (XPM) em conversores de comprimento de onda de fibra é proposto e validado através de simulação numérica até frequências de modulação acima de 1 THz. O modelo proposto permite a derivação de regras de engenharia para o dimensionamento de conversores de comprimento de onda compostos por espelhos de fibra não linear. O dimensionamento de um novo filtro para a optimização da conversão da XPM em modulação de intensidado é proposto e validado por simulação numérica. O impacto das não-linearidades na transmissão em fibra óptica de sinais de banda lateral única a 10 Gb/s com compensação de dispersão concentrada é avaliado através de simulação numérica. Mostra-se que as não-linearidades intra-canal levam a severa degradação do desempenho. A degradação de sinais de chaveamento por desvio diferencial de fase (DPSK) a 40 Gb/s devida a XPM com sinais de chaveamento por desvio de amplitude herdados de sistemas anteriores é também analisada. Uma análise bomba-sonda mostra que a degradação do sinal resulta da modulação de intensidade induzida por XPM. Este resultado permite a derivação de um modelo para estimar a probabilidade de erro dos sinais DPSK degradados por XPM. Finalmente, é apresentada uma abordagem analítica baseada em pequenas perturbações para o estudo de não linearidades intra-canal em fibra óptica em sinais com razão de extinção finita. Este estudo permite a identificação de duas novas formas de degradação tomando a forma de impulsos entre diferentes símbolos e fluctuações temporais e de amplitude.
This work presents three main studies regarding the development and application of advanced optical monitoring systems based on the analysis of asynchronous amplitude histograms, the wavelength conversion of ultra-high bit-rate signals, and the impact of fiber nonlinearities in systems employing advanced transmission techniques. It is shown that asynchronous amplitude histograms may be numerically compared with reference histograms to extract information regarding quality and the noise degrading the signal under analysis. The proposed method is validated through numerical simulation and experiment. An analytical model to compute the frequency limitations of cross-phase modulation (XPM) in all-optical fiber wavelength converters is proposed and validated using numerical simulation at modulation frequencies exceeding 1 THz. The proposed model allows deriving engineering rules for the dimensioning of wavelength converters using nonlinear optical loop mirrors. A novel filter design to optimize the conversion of XPM-induced phase modulation in intensity modulation is proposed and validated using numerical simulation. Numerical simulation is used to evaluate the impact of fiber nonlinearities in the transmission of 10 Gb/s single sideband signals in links using concentrated electrical or optical dispersion compensation. It is shown that, intra-channel fiber nonlinearities severely degrade the performance. The degradation of 40 Gb/s differential phase-shift-keying (DPSK) signals due to XPM with legacy amplitude-shift keying signals is also analyzed. Pump-probe analysis show that the signal degradation results from XPM-induced intensity modulation. This allows deriving and validating a novel analytical model to estimate the bit-error probability of the XPM-degraded DPSK signals. Finally, an analytical smallperturbations approach to the study of intra-channel fiber nonlinearities in signals with finite extinction ratio is presented. It allows the identification of two new forms of degradation taking the form of impulses between symbols and amplitude and temporal jitter.
Burcklen, Marie-Anne. "Conception conjointe de l'optique et du traitement pour l'optimisation des systèmes d'imagerie." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLO001.
Повний текст джерелаImaging systems are now complex instruments where lens, sensor and digital processing interact strongly together. In order to obtain better imaging performance than conventional imaging, it has become necessary to take into account this interaction in the design stage and therefore to optimize jointly optical and digital parameters. The objective of my thesis is to develop joint optical-digital optimization methods in order to obtain imaging systems with higher performance and lower complexity. I first considered extending the depth of field of an already existing lens. A binary phase mask has been inserted in the vicinity of the aperture stop of a f/1.2 lens, and it has been optimized jointly with a deconvolution filter using the restored image quality criterion. The increase in depth of field has been quantified, and modulation transfer function measurements have proved experimentally the efficiency of this unconventional imaging system. During this first study only the phase mask was optimized. To further increase the imaging system efficiency, all the optical parameters need to be optimized. However, optical design is a complex problem in which specific constraints have to be taken into account and for which one needs to use a dedicated software. In this thesis I used the Code V optical design software. Since the image quality-based optimization cannot be easily implemented in this type of software, I proposed a new criterion. It is based on classical optical optimization criteria used in Code V that have been modified in order to take into account deconvolution in a implicit manner. This design method has been first validated on the optimization of a phase mask for depth of field extension of an already existing lens. Results were similar to those given by the image quality-based optimization. Then this method has been used to enhance a very fast f/0.75 lens: by modifying its optical parameters, the lens has been simplified, and the image quality has been homogenized over the field. Eventually I applied this joint design method to solve the important problem of thermal sensitivity of an 8-12 µm infrared system. By using this method I designed from scratch several types of short and long focal length athermalized lenses. The obtained lenses are simpler than conventionally athermalized ones while having similar or even higher imaging performance
Emerton, Neil. "Design and fabrication techniques for surface relief diffractive optical elements." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38000.
Повний текст джерелаGhazisaeidi, Amirhossein. "Advanced Numerical Techniques for Design and Optimization of Optical Links Employing Nonlinear Semiconductor Optical Amplifiers." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/27541/27541.pdf.
Повний текст джерелаAydogdu, Selcuk. "Near Infrared Interference Filter Design And The Production Withion-assisted Deposition Techniques." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614092/index.pdf.
Повний текст джерелаLiu, Cheng. "Advanced system design and signal processing techniques for converged high-speed optical and wireless applications." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49058.
Повний текст джерелаLiou, K. S. "Improvement in automatic lens design techniques." Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355846.
Повний текст джерелаEngevik, Erlend L. "Optimal Design of Tidal Power Generator Using Stochastic Optimization Techniques." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-27239.
Повний текст джерелаWan, Li. "Modeling and optimal design of annular array based ultrasound pulse-echo system." Link to electronic thesis, 2001. http://www.wpi.edu/Pubs/ETD/Available/etd-0418101-100413/.
Повний текст джерелаTitle from title screen. Keywords: optimal design; modeling; object identification; ultrasound pulse-echo system; annular array. Includes bibliographical references (p. 159-162).
Soan, Peter Humphrey. "Transformation techniques in optimal design problems with application to harbour shapes." Thesis, Kingston University, 1990. http://eprints.kingston.ac.uk/20545/.
Повний текст джерелаHowlett, Isela D., Wanglei Han, Michael Gordon, Photini Rice, Jennifer K. Barton, and Raymond K. Kostuk. "Volume holographic imaging endoscopic design and construction techniques." SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, 2017. http://hdl.handle.net/10150/624713.
Повний текст джерелаWang, Y. "Analytical derivatives and other techniques for improving the effectiveness of automatic optical design." Thesis, University of Reading, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371442.
Повний текст джерелаButt, Sajid Ullah. "Design and modelling of a fixturing system for an optimal balancing of a part family." Paris, ENSAM, 2012. http://www.theses.fr/2012ENAM0022.
Повний текст джерелаDimensional errors of the parts of a part family cause the initial misplacing of the workpiece on the fixture affecting the final product quality. Even if the part is positioned correctly, the external machining forces and clamping load cause the part to deviate from this initial position depending upon that external load and the stiffness of the fixture. In this thesis, a comprehensive analytical model, consist of a kinematic and a mechanical model, of a 3-2-1 fixturing system is proposed. The kinematic model relocates the initially misplaced workpiece in the machine reference by the axial advancements of the six locators considering all the fixturing elements to be rigid. This repositioned part again displaces from the corrected position under the clamping and machining forces. The mechanical model calculates this displacement of the part considering the locators and clamps to be elastic. The rigid cuboid baseplate, used to precisely relocate the workpiece, is also considered elastic at the contacts with the locators. The non-linear behavior of the contact deformation is linearized by the converging the deformation of locators till the required precision is attained. Using small displacement hypothesis with zero friction at contacts, Lagrangian formulation enables us to calculate the rigid body displacement of the workpiece, deformation of each locator following minimum energy, and stiffness matrix and mechanical behavior of the fixturing system. This displacement of the workpiece is again compensated by the advancement of the six axial locators calculated through the kinematic model
Al-Bizri, N. "Aberration theory and design techniques for refracting prism systems." Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233134.
Повний текст джерелаNoble, Christopher Aaron. "Analytical and Numerical Techniques for the Optimal Design of Mineral Separation Circuits." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23224.
Повний текст джерелаPh. D.
Boonnithivorakul, Nattapong. "OPTIMAL CONTROL DESIGN FOR POLYNOMIAL NONLINEAR SYSTEMS USING SUM OF SQUARES TECHNIQUE WITH GUARANTEED LOCAL OPTIMALITY." OpenSIUC, 2010. https://opensiuc.lib.siu.edu/dissertations/149.
Повний текст джерелаVazquez, Javier. "Analysis and design of planar active and passive quasi-optical components using new FDTD techniques." Thesis, Queen Mary, University of London, 2002. http://qmro.qmul.ac.uk/xmlui/handle/123456789/28583.
Повний текст джерелаMiah, Suruz. "Design and Implementation of Control Techniques for Differential Drive Mobile Robots: An RFID Approach." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23343.
Повний текст джерелаPessoa, Lucio Flavio Cavalcanti. "Nonlinear systems and neural networks with hybrid morphological/rank/linear nodes : optimal design and applications to image processing and pattern recognition." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/13519.
Повний текст джерелаKarimli, Nigar. "Parameter Estimation and Optimal Design Techniques to Analyze a Mathematical Model in Wound Healing." TopSCHOLAR®, 2019. https://digitalcommons.wku.edu/theses/3114.
Повний текст джерелаGalvanin, Federico. "Optimal model-based design of experiments in dynamic systems: novel techniques and unconventional applications." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3427095.
Повний текст джерелаLe moderne tecniche di progettazione ottimale degli esperimenti basata su modello (MBDoE, model-based design of experiments) si sono dimostrate utili ed efficaci per sviluppare e affinare modelli matematici dinamici di tipo deterministico. Queste tecniche consentono di massimizzare il contenuto informativo di un esperimento di identificazione, determinando le condizioni sperimentali più opportune da adottare nella sperimentazione allo scopo di stimare i parametri di un modello nel modo più rapido ed efficiente possibile. Le tecniche MBDoE sono state applicate con successo in svariate applicazioni industriali. Tuttavia, nella loro formulazione standard, esse soffrono di alcune limitazioni. Infatti, quando sussistono vincoli sugli ingressi manipolabili dallo sperimentatore oppure sulle risposte del sistema, l’incertezza nell’informazione preliminare che lo sperimentatore possiede sul sistema fisico (in termini di struttura del modello e precisione nella stima dei parametri) può profondamente influenzare l’efficacia della procedura di progettazione dell’esperimento. Come conseguenza, è possibile che venga progettato un esperimento poco informativo e dunque inadeguato per stimare i parametri del modello in maniera statisticamente precisa ed accurata, o addirittura un esperimento che porta a violare i vincoli imposti sul sistema in esame. Inoltre, le tecniche MBDoE standard non considerano nella formulazione stessa del problema di progettazione la specificità e le caratteristiche del sistema di misura in termini di frequenza, precisione e accuratezza con cui le misure sono disponibili. Nella ricerca descritta in questa Dissertazione sono sviluppate metodologie avanzate di progettazione degli esperimenti con lo scopo di superare tali limitazioni. In particolare, sono proposte tre nuove tecniche per la progettazione ottimale di esperimenti dinamici basata su modello: 1. una tecnica di progettazione in linea degli esperimenti (OMBRE, online model-based redesign of experiments), che consente di riprogettare un esperimento mentre questo è ancora in esecuzione; 2. una tecnica basata sul concetto di “backoff” (arretramento) dai vincoli, per gestire l’incertezza parametrica e strutturale del modello; 3. una tecnica di progettazione che consente di ottimizzare l’informazione dinamica di un esperimento (DMBDoE, dynamic model-based design of experiments) allo scopo di considerare la specificità del sistema di misura disponibile. La procedura standard MBDoE per la progettazione di un esperimento è sequenziale e si articola in tre stadi successivi. Nel primo stadio l’esperimento viene progettato considerando l’informazione preliminare disponibile in termini di struttura del modello e stima preliminare dei parametri. Il risultato della progettazione è una serie di profili ottimali delle variabili manipolabili (ingressi) e l’allocazione ottimale dei tempi di campionamento delle misure (uscite). Nel secondo stadio l’esperimento viene effettivamente condotto, impiegando le condizioni sperimentali progettate e raccogliendo le misure come da progetto. Nel terzo stadio, le misure vengono utilizzate per stimare i parametri del modello. Seguendo questa procedura, l’informazione ottenuta dall’esperimento viene sfruttata solo a conclusione dell’esperimento stesso. La tecnica OMBRE proposta consente invece di riprogettare l’esperimento, e quindi di aggiornare i profili manipolabili nel tempo, mentre l’esperimento è ancora in esecuzione, attuando stime intermedie dei parametri. In questo modo l’informazione viene sfruttata progressivamente mano a mano che l’esperimento procede. I vantaggi di questa tecnica sono molteplici. Prima di tutto, la procedura di progettazione diventa meno sensibile, rispetto alla procedura standard, alla qualità della stima preliminare dei parametri. In secondo luogo, essa consente una stima dei parametri statisticamente più soddisfacente, grazie alla possibilità di sfruttare in modo progressivo l’informazione generata dall’esperimento. Inoltre, la tecnica OMBRE consente di ridurre le dimensioni del problema di ottimizzazione, con grande beneficio in termini di robustezza computazionale. In alcune applicazioni, risulta di importanza critica garantire la fattibilità dell’esperimento, ossia l’osservanza dei vincoli imposti sul sistema. Nella Dissertazione è proposta e illustrata una nuova procedura di progettazione degli esperimenti basata sul concetto di “backoff” (arretramento) dai vincoli, nella quale l’effetto dell’incertezza sulla stima dei parametri e/o l’inadeguatezza strutturale del modello vengono inclusi nella formulazione delle equazioni di vincolo grazie ad una simulazione stocastica. Questo approccio porta a ridurre lo spazio utile per la progettazione dell’esperimento in modo tale da assicurare che le condizioni di progettazione siano in grado di garantire non solo l’identificazione dei parametri del modello, ma anche la fattibilità dell’esperimento in presenza di incertezza strutturale e/o parametrica del modello. Nelle tecniche standard di progettazione la formulazione del problema di ottimo prevede che le misure vengano acquisite in maniera discreta, considerando una certa distanza temporale tra misure successive. Di conseguenza, l’informazione attesa dall’esperimento viene calcolata e massimizzata durante la progettazione mediante una misura discreta dell’informazione di Fisher. Tuttavia, nella pratica, sistemi di misura di tipo continuo permetterebbero di seguire la dinamica del processo mediante misurazioni molto frequenti. Per questo motivo viene proposto un nuovo criterio di progettazione (DMBDoE), nel quale l’informazione attesa dall’esperimento viene ottimizzata in maniera continua. Il nuovo approccio consente di generalizzare l’approccio della progettazione includendo le caratteristiche del sistema di misura (in termini di frequenza di campionamento, accuratezza e precisione delle misure) nella formulazione stessa del problema di ottimo. Un ulteriore contributo della ricerca presentata in questa Dissertazione è l’estensione al settore biomedico di tecniche MBDoE standard ed avanzate. I sistemi fisiologici sono caratterizzati da elevata complessità, e spesso da scarsa controllabilità e scarsa osservabilità. Questi elementi rendono particolarmente lunghe e complesse le procedure di identificazione parametrica di modelli fisiologici dettagliati. L’attività di ricerca ha considerato due problemi principali inerenti l’identificazione parametrica di modelli fisiologici: il primo legato a un modello per la somministrazione ottimale di agenti chemioterapici per la cura del cancro, il secondo relativo ai modelli complessi dell’omeostasi glucidica per soggetti affetti da diabete mellito di tipo 1. In quest’ultimo caso, al quale è rivolta attenzione particolare, l’obiettivo principale è identificare il set di parametri individuali del soggetto diabetico. Ciò consente di tracciarne un ritratto metabolico, fornendo così un prezioso supporto qualora si intenda utilizzare il modello per sviluppare e verificare algoritmi avanzati per il controllo del diabete di tipo 1. Nella letteratura e nella pratica medica esistono test clinici standard, quali il test orale di tolleranza al glucosio e il test post-prandiale da carico di glucosio, per la diagnostica del diabete e l’identificazione di modelli dell’omeostasi glucidica. Tali test sono sufficientemente brevi e sicuri per il soggetto diabetico, ma si possono rivelare poco informativi quando l’obiettivo è quello di identificare i parametri di modelli complessi del diabete. L’eccitazione fornita durante questi test al sistema-soggetto, in termini di infusione di insulina e somministrazione di glucosio, può infatti essere insufficiente per stimare in maniera statisticamente soddisfacente i parametri del modello. In questa Dissertazione è proposto l’impiego di tecniche MBDoE standard e avanzate per progettare test clinici che permettano di identificare nel modo più rapido ed efficiente possibile il set di parametri che caratterizzano un soggetto affetto da diabete, rispettando durante il test i vincoli imposti sul livello glicemico del soggetto. Partendo dai test standard per l’identificazione di modelli fisiologici del diabete, è così possibile determinare dei protocolli clinici modificati in grado di garantire test clinici altamente informativi, sicuri, poco invasivi e sufficientemente brevi. In particolare, si mostra come un test orale opportunamente modificato risulta altamente informativo per l’identificazione, sicuro per il paziente e di facile implementazione per il clinico. Inoltre, viene evidenziato come l’integrazione di tecniche avanzate di progettazione (quali OMBRE e tecniche basate sul concetto di backoff) è in grado di garantire elevata significatività e sicurezza dei test clinici anche in presenza di incertezza strutturale, oltre che parametrica, del modello. Infine, si mostra come, qualora siano disponibili misure molto frequenti della glicemia, ottimizzare mediante tecniche DMBDoE l’informazione dinamica progressivamente acquisita dal sistema di misura durante il test consente di sviluppare protocolli clinici altamente informativi, ma di durata inferiore, minimizzando così lo stress sul soggetto diabetico. La struttura della Dissertazione è la seguente. Il primo Capitolo illustra lo stato dell’arte delle attuali tecniche di progettazione ottimale degli esperimenti, analizzandone le limitazioni e identificando gli obiettivi della ricerca. Il secondo Capitolo contiene la trattazione matematica necessaria per comprendere la procedure standard di progettazione degli esperimenti. Il terzo Capitolo presenta la nuova tecnica OMBRE per la riprogettazione in linea di esperimenti dinamici. La tecnica viene applicata a due casi di studio, riguardanti un processo di fermentazione di biomassa in un reattore semicontinuo e un processo per la produzione di uretano. Il quarto Capitolo propone e illustra il metodo basato sul concetto di “backoff” per gestire l’effetto dell’incertezza parametrica e strutturale nella formulazione stessa del problema di progettazione. L’efficacia del metodo è verificata su due casi di studio in ambito biomedico. Il primo riguarda l’ottimizzazione dell’infusione di insulina per l’identificazione di un modello dettagliato del diabete mellito di tipo 1; il secondo la somministrazione ottimale di agenti chemioterapici per la cura del cancro. Il quinto Capitolo riguarda interamente il problema della progettazione ottimale di test clinici per l’identificazione di un modello fisiologico complesso del diabete mellito di tipo 1. La progettazione di protocolli clinici modificati avviene adottando tecniche MBDoE in presenza di elevata incertezza parametrica tra modello e soggetto diabetico. Il sesto Capitolo affronta il problema della progettazione dei test clinici assumendo sia incertezza di modello parametrica che strutturale. Il settimo Capitolo propone un nuovo criterio di progettazione (DMBDoE) che ottimizza l’informazione dinamica acquisibile da un esperimento. La tecnica viene applicata a un modello complesso del diabete mellito di tipo 1 e ad un processo per la fermentazione di biomassa in un reattore semicontinuo. Conclusioni e possibili sviluppi futuri vengono descritti nella sezione conclusiva della Dissertazione.
Nguyen, Giang Thach, and thach nguyen@rmit edu au. "Efficient Resonantly Enhanced Mach-Zehnder Optical Modulator on Lithium Niobate." RMIT University. Electrical and Computer Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20070118.162330.
Повний текст джерелаGodoy, Rodrigo Juliani Corrêa de. "Plantwide control: a review and proposal of an augmented hierarchical plantwide control design technique." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-07112017-140120/.
Повний текст джерелаO problema de projetar sistemas de controle para plantas inteiras é estudado. Uma revisão de trabalhos anteriores, técnicas disponíveis e atuais desafios de pesquisa é apresentada, seguida da descrição de algumas ferramentas teóricas para melhorar o controle plantwide, incluindo a proposta de um procedimento de otimização multi-objetivo lexicográfico aumentado. Com tais elementos, são propostas uma nova técnica hierárquica aumentada de projeto de sistemas de controle plantwide e uma técnica multi-objetivo para seleção de estrutura de controlador integrada à sintonia ótima do controlador. As principais contribuições das técnicas propostas são a inclusão de identificação de sistemas e sintonia ótima de controladores como parte do procedimento de projeto de controle plantwide para melhores resultados, suporte a especificações multi-objetivo e suporte a quaisquer tipos de plantas e controladores. Finalmente, as técnicas propostas são aplicadas a benchmarks industriais para demonstrar e validar sua aplicabilidade.
Di, Pretoro Alessandro. "Optimal design of flexible, operable and sustainable processes under uncertainty : biorefinery applications." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0073.
Повний текст джерелаThe conventional process design procedure is a well-established standard in process engineering and implies the fulfillment of the residual degrees of freedom by mean of optimizations based on several possible criteria. However, the optimality of the solution obtained by this procedure is strictly related to nominal operating conditions and doesn’t account for external perturbations. The purpose of this PhD thesis is then to include flexibility in every step of the process design procedure. An ABE biorefinery separation case study has been selected for this purpose. After a detailed literature research about flexibility, both deterministic and stochastic flexibility indexes have been found and compared on a simple distillation column case study. Then the optimal number of stages problem in equilibrium-staged operation under uncertain conditions has been discussed. The economic and environmental aspects were coupled in a unified procedure in order to assess the best compromise between units oversizing (i.e. investment costs) and external duty demand (OPerating EXpenses) to compensate operating conditions perturbations. Due to the highly non-ideal behaviour of the ABE/W mixture, the thermodynamic flexibility was assessed first by mean of Residue Curve Mapping in order to outline the uncertain domain physical boundaries where the separation is feasible. The procedure for a single column was extended to distillation trains as well as equivalent integrated configurations such as Dividing Wall Column. Since the successfully recovery of at least butanol and acetone is required for the profitability of the process, different configurations for the corresponding distillation column train have been designed and compared accounting for feed composition uncertainty. The indirect configuration was found as the best compromise due to the high butanol content in the feed. However distillation trains are considered an outdated solution for multicomponent mixtures purification. They have been indeed replaced by integrated solutions resulting in both lower investments and lower operating costs. A Dividing Wall Column was then designed with respect to the same process specifications by mean of a feasible path based methodology. It consists of the arrangement of a Petlyuk column into a single column shell. A flexibility assessment was then performed on the DWC as well highlighting both benefits and drawbacks of the employment of a process intensified design solution. The optimal DWC design was then discussed by considering flexibility needs and oversizing costs compared to the classical distillation train configuration. All calculations and simulations performed so far were nonetheless related to steady state conditions. In order to have a more complete overview of flexibility indexes process dynamics was investigated as well. When taking into account process dynamics the flexibility assessment results and thus the required equipment oversizing necessarily depend on the control configuration. A new “switchability” index has been defined by correlating the dynamic and steady state performances under a flexibility point of view. The proper definition of this index was referred to a Model Predictive Control configuration for a simple system but it can be used for any kind of control loop configurations in order to compare them. To describe this latter case study the same distillation column involved in the steady state indexes comparison was simulated in DynSim with PID controllers in order to highlight the influence of dynamics. The final outcome of this thesis work is then the definition of a comprehensive approach for multicriteria design of unit operations in general under uncertain operating conditions and investigate the associated criticalities. Those criteria are respectively economics, flexibility, controllability and sustainability
Giuglea, Alexandru, Guido Belfiore, Mahdi Khafaji, Ronny Henker, Despoina Petousi, Georg Winzer, Lars Zimmermann, and Frank Ellinger. "Comparison of Segmented and Traveling-Wave Electro-Optical Transmitters Based on Silicon Photonics Mach-Zehnder Modulators." Institute of Electrical and Electronics Engineers (IEEE), 2018. https://tud.qucosa.de/id/qucosa%3A35393.
Повний текст джерелаWAN, Li. "Modeling and Optimal Design of Annular Array Based Ultrasound Pulse-Echo System." Digital WPI, 2001. https://digitalcommons.wpi.edu/etd-theses/219.
Повний текст джерелаAbushammala, Omran. "Optimal Helical Tube Design for Intensified Heat / Mass Exchangers." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0091.
Повний текст джерелаThe search for technological solutions aimed at minimizing the size of a device, known as intensification, is a classic objective of process engineering. In this thesis, the intensification possibilities offered by helical tubes are studied, both for heat and mass exchangers. The use of helical tubes instead of straight tubes is indeed of interest both in terms of increasing the exchange surface per unit volume between the two fluids circulating in the exchanger and by the possibility of increasing the transfers by generating Dean vortices in the tubes. A set of CFD (Computational Fluid Dynamics) type simulations was carried out and compared with experimental results. In the end, on the basis of a systematic approach using correlations, a volume reduction of a factor of 8 was obtained, both for heat exchangers and for membrane contactors
Mignard-Debise, Lois. "Tools for the paraxial optical design of light field imaging systems." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0009/document.
Повний текст джерелаLight field imaging is often presented as a revolution of standard imaging. Indeed, it does bring more control to the user over the final image as the spatio-angular dimensions of the light field offer the possibility to change the viewpoint and refocus after the shot and compute the scene depth map.However, it complicates the work of the optical designer of the system for two reasons. The first is that there exist a multitude of different light field acquisition devices, each with its own specific design. The second is that there is no model that relates the camera design to its optical properties of acquisition and that would guide the designer in his task. This thesis addresses these observations by proposing a first-order optical model to represent any light field acquisition device. This model abstracts a light field camera as en equivalent array of virtual cameras that exists in object space and that performs the same sampling of the scene. The model is used to study and compare several light field cameras as well as a light field microscope setup which reveals guidelines for the conception of light field optical systems. The simulations of the model are also validated through experimentation with a light field camera and a light field microscope that was constructed in our laboratory
Lopez, Sanchez Francisco Javier. "Optimal design and application of trellis coded modulation techniques defined over the ring of integers." Thesis, Staffordshire University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262313.
Повний текст джерелаGong, Jinlin. "Modélisation et conception optimale d’un moteur linéaire à induction pour système de traction ferroviaire." Thesis, Ecole centrale de Lille, 2011. http://www.theses.fr/2011ECLI0016/document.
Повний текст джерелаThis thesis focuses on studying the performance of the linear induction motor using the method of finite element analysis, and the optimal design on a time-costly model. The finite element method is used to study the performance of the linear induction motor. Firstly, the 2D finite element model (FEM) is constructed, which allows taking into account the longitudinal end effects. The transverse edge effects are taken into account within 2D model by varying the conductivity of the secondary and by adding the inductance of the winding overhang. Secondly, a coupled model between the magnetic and thermal 3D FEM is built which allows taking into account both the end effects and the temperature influence. Finally, a test bench is realized to validate the models. The comparison between the different models shows the importance of the coupled model. Optimal design using finite element modeling tools is a complex task and also time-costly. The surrogate model-assisted optimization strategies are studied. The direct surrogate model-assisted optimization and the Efficient Global Optimization are compared. A three-level output space-mapping technique is proposed to reduce the computation time. The optimization results show that the proposed algorithm allows saving a substantial computation time compared to the classical two level output space-mapping. Using the 3D FEM, a multi-objective optimization with a progressive improvement of a surrogate model is proposed. The proposed strategy evaluates the FEM in parallel. A 3D Pareto front composed of the finite element model evaluation results is obtained, which allows taking the decision for the engineering design
Straka, Branislav. "Optická pinzeta pro koherencí řízený holografický mikroskop." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230594.
Повний текст джерелаKrueger, Jared K. (Jared Keith). "CLOSeSat : Perigee-lowering techniques and preliminary design for a small optical imaging satellite operating in very low earth orbit." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/64565.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 125-126).
The ever-increasing role of intelligence, surveillance, and reconnaissance (ISR) assets in combat may require relatively large numbers of earth observation spacecraft to maintain situational awareness. One way to reduce the cost of such systems is to operate at very low altitudes, thereby minimizing optics size and cost for a given ground resolution. This outside-the-box idea attempts to bridge the gap between high-altitude aerial reconnaissance platforms and traditional LEO satellites. Possible benefits from such a design include enabling a series of cheap, small satellites with improved optical resolution, greater resistance to adversary tracking, and 'quick strike' capability. In this thesis satellite systems design processes and tools are utilized to analyze advanced concepts of low perigee systems and reduce the useful perigee boundary of satellite orbits. The feasibility and utility of such designs are evaluated through the use of the Satellite System Design Tool (SSDT), an integrated approach using models and simulations in MATLAB and Satellite Tool Kit (STK). Finally a potential system design is suggested for a conceptual Continuous Low Orbit Surveillance Satellite (CLOSeSat). The proposed CLOSeSat design utilizes an advanced propulsion system and swooping maneuvers to improve survivability and extend lifetime at operational perigees as low as 160 kilometers, with sustained circular orbits at 240 kilometers. The views expressed in this thesis are those of the author and do not reflect the official policy or position of the United States Air Force, Department of Defense, or the U.S. Government.
by Jared K. Krueger.
S.M.
Ceschia, Adriano. "Méthodologie de conception optimale de chaines de conversion d’énergie embarquées." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST023.
Повний текст джерелаThe research work proposed in this thesis falls within the context of embedded systems electrification with the development of a new hybrid power conversion chain, with new energy sources and powertrains. These systems offer many degrees of freedom regarding both the devices parameters and the tuning values of the associated control laws. The relevant (technico-economic) optimization of these complex power chains relies on the ability of the best-set algorithm to combine simultaneously the main parameters and the technological constraints of each component, the uncertain environmental conditions faced during areal use and finally the control algorithms as well as the global energy management. Their performances are based on the capacity of the design approaches to consider the real environment multiphysic constraints, the adequacy of the technologies, the topologies and the control laws, allowing to integrate and to associate effectively their constituents. In this context, this research work aims at developing tools and methods allowing the optimization of the power architectures and their components (hybrid energy conversion) by integrating in the design process the control-command and the energy management aspects. They consider a use case based on hybrid Fuel cell / Battery power system.For this purpose, a new nested methodology for complex system is been suggested. It enables to tackle large search spaces and considers different performance indexes (energy saving, reliability and volume). It simultaneously tunes and designs the energy management and component sizing by optimizing the main powertrain parameters while respecting the specifications. Technically, it uses two nested loops, combining the particle swarm optimization (PSO) technique’s performance and the rapid optimal control algorithm. This strategy addresses vast search spaces, achieves faster convergence to the global optimal integer design solution, and provides a good accuracy and robustness. In order to consider the randomness feature of real driving cycle (stochastic characteristic), a real time energy management strategy (EMS) was introduced based on an extension of the design approach, which increases its availability. By using machine-learning technique, an estimation of the current driving mode is developed and permits to guide the online energy management system
Neradovskiy, Maxim. "Guides d’ondes dans un cristal de niobate de lithium périodiquement polarisé : fabrication et étude par des techniques de microscopie à sonde locale." Thesis, Nice, 2016. http://www.theses.fr/2016NICE4035/document.
Повний текст джерелаThe investigation of influence of the soft proton exchange (SPE) optical waveguide (WG) creation onperiodically poled lithium niobate (PPLN) has been done. It has been shown that the WG fabricationprocess can induce the formation of needle like nanodomains, which can be responsible for thedegradation of the nonlinear response of the WG created in PPLN crystals. The domain structure (DS)evolution has been studied in congruent lithium niobate (LN) crystals with surface layers modified bythree different proton exchange techniques. The significant decrease of the nucleation threshold fieldand qualitative change of domain rays nucleation and growth have been revealed. The formation of abroad domain boundary and dendrite domain structure as a result of nanodomains merging in front ofthe moving rays has been demonstrated. The formation of DS in LN with SPE by irradiation of coveredby electron resist polar surface of LN has been investigated. Formation of domains with arbitrary shapesas a result of discrete switching has been revealed. Finally, it has been demonstrated that electron beamirradiation of lithium niobate crystals with surface resist layer can produce high quality periodical domainpatterns after channel waveguide fabrication. Nonlinear characterizations show that the conversionefficiencies and the phase matching spectra conform to theoretical predictions, indicating that thiscombination presents a great interest for device fabrication. Second harmonic generation withnormalized nonlinear conversion efficiency up to 48%/(W cm2) has been achieved in such waveguides
Xia, Liang. "Towards optimal design of multiscale nonlinear structures : reduced-order modeling approaches." Thesis, Compiègne, 2015. http://www.theses.fr/2015COMP2230/document.
Повний текст джерелаHigh-performance heterogeneous materials have been increasingly used nowadays for their advantageous overall characteristics resulting in superior structural mechanical performance. The pronounced heterogeneities of materials have significant impact on the structural behavior that one needs to account for both material microscopic heterogeneities and constituent behaviors to achieve reliable structural designs. Meanwhile, the fast progress of material science and the latest development of 3D printing techniques make it possible to generate more innovative, lightweight, and structurally efficient designs through controlling the composition and the microstructure of material at the microscopic scale. In this thesis, we have made first attempts towards topology optimization design of multiscale nonlinear structures, including design of highly heterogeneous structures, material microstructural design, and simultaneous design of structure and materials. We have primarily developed a multiscale design framework, constituted of two key ingredients : multiscale modeling for structural performance simulation and topology optimization forstructural design. With regard to the first ingredient, we employ the first-order computational homogenization method FE2 to bridge structural and material scales. With regard to the second ingredient, we apply the method Bi-directional Evolutionary Structural Optimization (BESO) to perform topology optimization. In contrast to the conventional nonlinear design of homogeneous structures, this design framework provides an automatic design tool for nonlinear highly heterogeneous structures of which the underlying material model is governed directly by the realistic microstructural geometry and the microscopic constitutive laws. Note that the FE2 method is extremely expensive in terms of computing time and storage requirement. The dilemma of heavy computational burden is even more pronounced when it comes to topology optimization : not only is it required to solve the time-consuming multiscale problem once, but for many different realizations of the structural topology. Meanwhile we note that the optimization process requires multiple design loops involving similar or even repeated computations at the microscopic scale. For these reasons, we introduce to the design framework a third ingredient : reduced-order modeling (ROM). We develop an adaptive surrogate model using snapshot Proper Orthogonal Decomposition (POD) and Diffuse Approximation to substitute the microscopic solutions. The surrogate model is initially built by the first design iteration and updated adaptively in the subsequent design iterations. This surrogate model has shown promising performance in terms of reducing computing cost and modeling accuracy when applied to the design framework for nonlinear elastic cases. As for more severe material nonlinearity, we employ directly an established method potential based Reduced Basis Model Order Reduction (pRBMOR). The key idea of pRBMOR is to approximate the internal variables of the dissipative material by a precomputed reduced basis computed from snapshot POD. To drastically accelerate the computing procedure, pRBMOR has been implemented by parallelization on modern Graphics Processing Units (GPUs). The implementation of pRBMOR with GPU acceleration enables us to realize the design of multiscale elastoviscoplastic structures using the previously developed design framework inrealistic computing time and with affordable memory requirement. We have so far assumed a fixed material microstructure at the microscopic scale. The remaining part of the thesis is dedicated to simultaneous design of both macroscopic structure and microscopic materials. By the previously established multiscale design framework, we have topology variables and volume constraints defined at both scales
Tran, Minh Tue. "Pixel and patch based texture synthesis using image segmentation." University of Western Australia. School of Computer Science and Software Engineering, 2010. http://theses.library.uwa.edu.au/adt-WU2010.0030.
Повний текст джерелаMehranipornejad, Ebrahim. "Evaluation of AASHTO design specifications for cast-in-place continuous bridge deck using remote sensing technique." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001584.
Повний текст джерелаRoth, Matthias, Jörg Heber, and Klaus Janschek. "System design of programmable 4f phase modulation techniques for rapid intensity shaping: A conceptual comparison." SPIE, 2016. https://tud.qucosa.de/id/qucosa%3A35096.
Повний текст джерелаFalcon, Maimone Rafael. "Co-conception des systemes optiques avec masques de phase pour l'augmentation de la profondeur du champ : evaluation du performance et contribution de la super-résolution." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLO006/document.
Повний текст джерелаPhase masks are wavefront encoding devices typically situated at the aperture stop of an optical system to engineer its point spread function (PSF) in a technique commonly known as wavefront coding. These masks can be used to extend the depth of field (DoF) of imaging systems without reducing the light throughput by producing a PSF that becomes more invariant to defocus; however, the larger the DoF the more blurred the acquired raw image so that deconvolution has to be applied on the captured images. Thus, the design of the phase masks has to take into account image processing in order to reach the optimal compromise between invariance of PSF to defocus and capacity to deconvolve the image. This joint design approach has been introduced by Cathey and Dowski in 1995 and refined in 2002 for continuous-phase DoF enhancing masks and generalized by Robinson and Stork in 2007 to correct other optical aberrations.In this thesis we study the different aspects of phase mask optimization for DoF extension, such as the different performance criteria and the relation of these criteria with the different mask parameters. We use the so-called image quality (IQ), a mean-square error based criterion defined by Diaz et al., to co-design different phase masks and evaluate their performance. We then compare the relevance of the IQ criterion against other optical design metrics, such as the Strehl ratio, the modulation transfer function (MTF) and others. We focus in particular on the binary annular phase masks, their performance for various conditions, such as the desired DoF range, the number of optimization parameters, presence of aberrations and others.We use then the analysis tools used for the binary phase masks for continuous-phase masks that appear commonly in the literature, such as the polynomial-phase masks. We extensively compare these masks to each other and the binary masks, not only to assess their benefits, but also because by analyzing their differences we can understand their properties.Phase masks function as a low-pass filter on diffraction limited systems, effectively reducing aliasing. On the other hand, the signal processing technique known as superresolution uses several aliased frames of the same scene to enhance the resolution of the final image beyond the sampling resolution of the original optical system. Practical examples come from the works made during a secondment with the industrial partner KLA-Tencor in Leuven, Belgium. At the end of the manuscript we study the relevance of using such a technique alongside phase masks for DoF extension
Abouseif, Akram. "Emerging DSP techniques for multi-core fiber transmission systems." Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAT013.
Повний текст джерелаOptical communication systems have seen several phases in the last decades. It is predictable that the optical systems as we know will reach the non-linear capacity limits. At the moment, the space is the last degree of freedom to be implemented in order to keep delivering the upcoming capacity demands for the next years. Therefore, intensive researches are conducted to explore all the aspects concerning the deployment of the space-division multiplexing (SDM) system. Several impairments impact the SDM systems as a result from the interaction of the spatial channels which degrades the system performance. In this thesis, we focus on the multi-core fibers (MCFs) as the most promising approach to be the first representative of the SDM system. We present different digital and optical solutions to mitigate the non-unitary effect known as the core dependent loss (CDL). The first part is dedicated to study the performance of the MCF transmission taking into account the propagating impairments that impact the MCF systems. We propose a channel model that helps to identify the MCFs system. The second part is devoted to optical technique to enhance the transmission performance with an optimal solution. After, we introduced digital techniques for further enhancement, the Zero Forcing pre-compensation and the space-time coding for further CDL mitigation. All the simulation results are validated analytically by deriving the error probability upper bounds
Kurth, Mathias. "Contention techniques for opportunistic communication in wireless mesh networks." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2012. http://dx.doi.org/10.18452/16458.
Повний текст джерелаIn the field of wireless communication, a tremendous progress can be observed especially at the lower layers. Innovative physical layer (PHY) concepts and technologies can be rapidly assimilated in cellular networks. Wireless mesh networks (WMNs), on the other hand, cannot keep up with the speed of innovation at the PHY due to their flat and decentralized architecture. Many innovative PHY technologies rely on multi-user communication, so that the established abstraction of the network stack does not work well for WMNs. The scheduling problem in WMNs is inherent complex. Surprisingly, carrier sense multiple access (CSMA) in WMNs is asymptotically utility-optimal even though it has a low computational complexity and does not involve message exchange. Hence, the question arises whether CSMA and the underlying concept of contention allows for the assimilation of advanced PHY technologies into WMNs. In this thesis, we design and evaluate contention protocols based on CSMA for opportunistic communication in WMNs. Opportunistic communication is a technique that relies on multi-user diversity in order to exploit the inherent characteristics of the wireless channel. In particular, we consider opportunistic routing (OR) and opportunistic scheduling (OS) in memoryless and slow fading channels, respectively. We present models for congestion control, routing and contention-based opportunistic communication in WMNs in order to maximize both throughput and fairness of elastic unicast traffic flows. At the instance of IEEE 802.11, we illustrate how the cross-layer algorithms can be implemented within a network simulator prototype. Our evaluation results lead to the conclusion that contention-based opportunistic communication is feasible. Furthermore, the proposed protocols increase both throughput and fairness in comparison to state-of-the-art approaches like DCF, DSR, ExOR, RBAR and ETT.
Price, Nathaniel Bouton. "Conception sous incertitudes de modèles avec prise en compte des tests futurs et des re-conceptions." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEM012/document.
Повний текст джерелаAt the initial design stage, engineers often rely on low-fidelity models that have high uncertainty. In a deterministic safety-margin-based design approach, uncertainty is implicitly compensated for by using fixed conservative values in place of aleatory variables and ensuring the design satisfies a safety-margin with respect to design constraints. After an initial design is selected, high-fidelity modeling is performed to reduce epistemic uncertainty and ensure the design achieves the targeted levels of safety. High-fidelity modeling is used to calibrate low-fidelity models and prescribe redesign when tests are not passed. After calibration, reduced epistemic model uncertainty can be leveraged through redesign to restore safety or improve design performance; however, redesign may be associated with substantial costs or delays. In this work, the possible effects of a future test and redesign are considered while the initial design is optimized using only a low-fidelity model. The context of the work and a literature review make Chapters 1 and 2 of this manuscript. Chapter 3 analyzes the dilemma of whether to start with a more conservative initial design and possibly redesign for performance or to start with a less conservative initial design and risk redesigning to restore safety. Chapter 4 develops a generalized method for simulating a future test and possible redesign that accounts for spatial correlations in the epistemic model error. Chapter 5 discusses the application of the method to the design of a sounding rocket under mixed epistemic model uncertainty and aleatory parameter uncertainty. Chapter 6 concludes the work