Дисертації з теми "Cycle detection"
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Yin, Lan 1969. "GPS based positioning with cycle slip detection." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79206.
Повний текст джерелаIn GPS a typical technique for kinematic position estimation is relative positioning where two receivers are used, one receiver is stationary and its exact position is known, the other is roving and its position is to be estimated. We describe the physical situation and give the mathematical model based on the difference of the measurements at the stationary and roving receivers. The model we consider combines both code pseudorange and carrier phase measurements. We then present: a recursive least squares approach for position estimation. We take full account of the structure of the problem to make our algorithm efficient, and use orthogonal transformations to ensure numerical reliability of the algorithm.
At each epoch, possible cycle slips must be detected, otherwise it may significant deteriorate the positioning accuracy. A cycle slip detection method based on the higher-order difference technique, one of typical techniques for cycle slip detection, is developed and incorporated into the preprocess of our positioning algorithm.
Finally, real data testing for our positioning algorithm and cycle slip detection algorithm are performed. The results suggest our algorithms are very effective.
DISPA, LIMOUZIN CHRISTIANE. "Reperage de la periode fertile et de l'ovulation : les moyens actuels et leur utilisation." Lille 2, 1989. http://www.theses.fr/1989LIL2M360.
Повний текст джерелаGregory, Connor. "Non-intrusive fault detection of reverse cycle air conditioning systems – Dissertation." Thesis, Gregory, Connor (2018) Non-intrusive fault detection of reverse cycle air conditioning systems – Dissertation. Honours thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/44815/.
Повний текст джерелаLeal, Soraya Cristina de Macedo. "Detection and characterization of Metarhizium anisopliae using molecular markers." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307762.
Повний текст джерелаMeless, Dejen. "Test Cycle Optimization using Regression Analysis." Thesis, Linköping University, Automatic Control, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-54809.
Повний текст джерелаIndustrial robots make up an important part in today’s industry and are assigned to a range of different tasks. Needless to say, businesses need to rely on their machine park to function as planned, avoiding stops in production due to machine failures. This is where fault detection methods play a very important part. In this thesis a specific fault detection method based on signal analysis will be considered. When testing a robot for fault(s), a specific test cycle (trajectory) is executed in order to be able to compare test data from different test occasions. Furthermore, different test cycles yield different measurements to analyse, which may affect the performance of the analysis. The question posed is: Can we find an optimal test cycle so that the fault is best revealed in the test data? The goal of this thesis is to, using regression analysis, investigate how the presently executed test cycle in a specific diagnosis method relates to the faults that are monitored (in this case a so called friction fault) and decide if a different one should be recommended. The data also includes representations of two disturbances.
The results from the regression show that the variation in the test quantities utilised in the diagnosis method are not explained by neither the friction fault or the test cycle. It showed that the disturbances had too large effect on the test quantities. This made it impossible to recommend a different (optimal) test cycle based on the analysis.
Lee, Seungyup. "A rapid cycle length variability detection technique of atrial electrographs in atrial fibrillation." online version, 2008. http://rave.ohiolink.edu/etdc/view.cgi?acc%5Fnum=case1207255208.
Повний текст джерелаLee, Seungyup. "A RAPID CYCLE LENGTH VARIABILITY DETECTION TECHNIQUE OF ATRIAL ELECTROGRAMS IN ATRIAL FIBRILLATION." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1207255208.
Повний текст джерелаHarshman, D. K., B. M. Rao, J. E. McLain, G. S. Watts, and J. Y. Yoon. "Innovative qPCR using interfacial effects to enable low threshold cycle detection and inhibition relief." AAAS, 2015. http://hdl.handle.net/10150/621255.
Повний текст джерелаMolecular diagnostics offers quick access to information but fails to operate at a speed required for clinical decision-making. Our novel methodology, droplet-on-thermocouple silhouette real-time polymerase chain reaction (DOTS qPCR), uses interfacial effects for droplet actuation, inhibition relief, and amplification sensing. DOTS qPCR has sample-to-answer times as short as 3 min 30 s. In infective endocarditis diagnosis, DOTS qPCR demonstrates reproducibility, differentiation of antibiotic susceptibility, subpicogram limit of detection, and thermocycling speeds of up to 28 s/cycle in the presence of tissue contaminants. Langmuir and Gibbs adsorption isotherms are used to describe the decreasing interfacial tension upon amplification. Moreover, a log-linear relationship with low threshold cycles is presented for real-time quantification by imaging the droplet-on-thermocouple silhouette with a smartphone. DOTS qPCR resolves several limitations of commercially available real-time PCR systems, which rely on fluorescence detection, have substantially higher threshold cycles, and require expensive optical components and extensive sample preparation. Due to the advantages of low threshold cycle detection, we anticipate extending this technology to biological research applications such as single cell, single nucleus, and single DNA molecule analyses. Our work is the first demonstrated use of interfacial effects for sensing reaction progress, and it will enable point-of-care molecular diagnosis of infections.
Cockerton, Helen Elizabeth. "Late-glacial and Holocene variations in the Si cycle in the Nile Basin : multi-isotope evidence from modern waters and lake sediments." Thesis, Swansea University, 2012. https://cronfa.swan.ac.uk/Record/cronfa42906.
Повний текст джерелаHe, Han M. Eng Massachusetts Institute of Technology. "Applications of reference cycle building and K-shape clustering for anomaly detection in the semiconductor manufacturing process." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120246.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 68-69).
Early and accurate anomaly detection plays a key role in reducing costs and improving benefits, especially for complicated and time-consuming manufacturing such as semiconductor production. A case study of detecting anomalies from several monitored parameters during one plasma etching process is presented in this thesis. The thesis focuses on optimized ways to build reference cycles, or centroids of univariate parameters, a critical component to determine clustering accuracy and to facilitate process engineers' offline anomaly detections and diagnoses. Three time series centroid building methods are discussed and evaluated in the thesis, arithmetic, the Dynamic Time Warping Barycenter Averaging (DBA), and the soft-DTW-based centroid. As a result, DBA is chosen considering its comprehensive performance of accuracy and calculation time. Optimizations on DBA is further discussed to reduce calculation time. The window constraint, as well as the recalculation method of combining the previous centroid and new datasets, substantially reduce calculation time with slight accuracy loss. Based upon one centroid building method, shape extraction, a novel clustering method, k-shape, is implemented and applied to the plasma etching process. It is found that it achieves great accuracy with substantially shorter calculation time than one mainstream clustering method, k-means.
by Han He.
M. Eng. in Advanced Manufacturing and Design
Dale, Olivia R. "Detection, diversity, and activity on anaerobic ammonium oxidizing bacteria (Anammox) in the Cape Fear River Estuary /." Electronic version (PDF), 2007. http://dl.uncw.edu/etd/2007-1/r1/daleo/oliviadale.pdf.
Повний текст джерелаAbdelghaffar, Hossam Mohamed Abdelwahed. "Developing and Testing a Novel De-centralized Cycle-free Game Theoretic Traffic Signal Controller: A Traffic Efficiency and Environmental Perspective." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/100681.
Повний текст джерелаPHD
Urbano, Simone. "Detection and diagnostic of freeplay induced limit cycle oscillation in the flight control system of a civil aircraf." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0023/document.
Повний текст джерелаThis research study is the result of a 3 years CIFRE PhD thesis between the Airbus design office(Aircraft Control domain) and TéSA laboratory in Toulouse. The main goal is to propose, developand validate a software solution for the detection and diagnosis of a specific type of elevator andrudder vibration, called limit cycle oscillation (LCO), based on existing signals available in flightcontrol computers on board in-series aircraft. LCO is a generic mathematical term defining aninitial condition-independent periodic mode occurring in nonconservative nonlinear systems. Thisstudy focuses on the LCO phenomenon induced by mechanical freeplays in the control surface ofa civil aircraft. The LCO consequences are local structural load augmentation, flight handlingqualities deterioration, actuator operational life reduction, cockpit and cabin comfort deteriorationand maintenance cost augmentation. The state-of-the-art for freeplay induced LCO detection anddiagnosis is based on the pilot sensitivity to vibration and to periodic freeplay check on the controlsurfaces. This study is thought to propose a data-driven solution to help LCO and freeplaydiagnosis. The goal is to improve even more aircraft availability and reduce the maintenance costsby providing to the airlines a condition monitoring signal for LCO and freeplays. For this reason,two algorithmic solutions for vibration and freeplay diagnosis are investigated in this PhD thesis. Areal time detector for LCO diagnosis is first proposed based on the theory of the generalized likeli hood ratio test (GLRT). Some variants and simplifications are also proposed to be compliantwith the industrial constraints. In a second part of this work, a mechanical freeplay detector isintroduced based on the theory of Wiener model identification. Parametric (maximum likelihoodestimator) and non parametric (kernel regression) approaches are investigated, as well as somevariants to well-known nonparametric methods. In particular, the problem of hysteresis cycleestimation (as the output nonlinearity of a Wiener model) is tackled. Moreover, the constrainedand unconstrained problems are studied. A theoretical, numerical (simulator) and experimental(flight data and laboratory) analysis is carried out to investigate the performance of the proposeddetectors and to identify limitations and industrial feasibility. The obtained numerical andexperimental results confirm that the proposed GLR test (and its variants/simplifications) is a very appealing method for LCO diagnostic in terms of performance, robustness and computationalcost. On the other hand, the proposed freeplay diagnostic algorithm is able to detect relativelylarge freeplay levels, but it does not provide consistent results for relatively small freeplay levels. Moreover, specific input types are needed to guarantee repetitive and consistent results. Further studies should be carried out in order to compare the GLRT results with a Bayesian approach and to investigate more deeply the possibilities and limitations of the proposed parametric method for Wiener model identification
Ruchirat, Piyapathu. "State detection mechanism, productivity bias and a medium open economy real business cycle model for Thailand (1993-2005 data)." Thesis, Cardiff University, 2005. http://orca.cf.ac.uk/55568/.
Повний текст джерелаShojaeian, Jalouli Miranda. "Oral cancer with special reference to virus detection and quantitative gene expression." Doctoral thesis, Uppsala universitet, Käkkirurgi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-275516.
Повний текст джерелаKong, Xiangxiong, Jian Li, William Collins, Caroline Bennett, Simon Laflamme, and Hongki Jo. "A robust signal processing method for quantitative high-cycle fatigue crack monitoring using soft elastomeric capacitor sensors." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/625834.
Повний текст джерелаDarmastuti, Zhafira. "SiC-FET Gas Sensors Developed for Control of the Flue Gas Desulfurization System in Power Plants Experimental and Modeling : Experimental and Modeling." Doctoral thesis, Linköpings universitet, Tillämpad sensorvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-106224.
Повний текст джерелаOsiki, Prisca Ofure. "The effect of beta-oxidation or TCA cycle inhibition on mitochondrial function and the sensitivity of high resolution respiratory detection." Master's thesis, Faculty of Health Sciences, 2019. http://hdl.handle.net/11427/30944.
Повний текст джерелаEl, Basri Emanuele [Verfasser], and Norbert [Akademischer Betreuer] Dichtl. "Development of a fault detection algorithm for an alternate aerobic/anoxic cycle nitrogen removal process / Emanuele El Basri ; Betreuer: Norbert Dichtl." Braunschweig : Technische Universität Braunschweig, 2018. http://d-nb.info/1175815993/34.
Повний текст джерелаFenwick, Sharon. "Detection of human papillomavirus (HPV) and expression of cell-cycle markers in breast carcinoma in a cohort of South African patients." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/3077.
Повний текст джерелаIncludes bibliographical references.
Breast carcinoma is a common cancer in South African women. In the Republic of South Africa, 41 new cases of breast cancer are diagnosed per 100 000 population and the mortality rate is 21 per 100 000 population. Many risk factors have been implicated in the carcinogenesis of this disease; including smoking, family history and hormones, however, this only accounts for about 1/3 of the cases diagnosed. Some studies have implicated Human papillomavirus (HPV) as a possible aetiologic agent in the pathogenesis of breast carcinoma however the results have been inconsistent and sometimes controversial. This study was designed to determine the presence of HPV in breast cancer in a South African cohort and to investigate its influence on the cell cycle. A retrospective and prospective cell block study was undertaken.
Chang, Kevin. "Spectrum sensing, detection and optimisation in cognitive radio for non-stationary primary user signals." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/54728/1/Kevin_Chang_Thesis.pdf.
Повний текст джерелаBarningham, Thomas. "Detection and attribution of carbon cycle processes from atmospheric O2 and CO2 measurements at Halley Research Station, Antarctica and Weybourne Atmospheric Observatory, U.K." Thesis, University of East Anglia, 2018. https://ueaeprints.uea.ac.uk/68343/.
Повний текст джерелаHákonardóttir, Stefanía. "Prosthetic Control using Implanted Electrode Signals." Thesis, KTH, Skolan för teknik och hälsa (STH), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147699.
Повний текст джерелаCross, Michaela. "Detection of Secondary Transfer of Human Spermatozoa between Items of Clothing during a Domestic Washing Machine Cycle using the Quantifiler® Trio DNA Quantification Kit." Thesis, Cross, Michaela (2017) Detection of Secondary Transfer of Human Spermatozoa between Items of Clothing during a Domestic Washing Machine Cycle using the Quantifiler® Trio DNA Quantification Kit. Masters by Coursework thesis, Murdoch University, 2017. https://researchrepository.murdoch.edu.au/id/eprint/39828/.
Повний текст джерелаRedchuk, Mariia [Verfasser], Livia [Akademischer Betreuer] Ludhová, and Achim [Akademischer Betreuer] Stahl. "Looking inside the sun with the Borexino experiment : detection of solar neutrinos from the proton-proton chain and the CNO cycle / Mariia Redchuk ; Livia Ludhová, Achim Stahl." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1229947841/34.
Повний текст джерелаLin, TsungPo. "An adaptive modeling and simulation environment for combined-cycle data reconciliation and degradation estimation." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24819.
Повний текст джерелаCommittee Chair: Dimitri Mavris; Committee Member: Erwing Calleros; Committee Member: Hongmei Chen; Committee Member: Mark Waters; Committee Member: Vitali Volovoi.
Lindqvist, Jakob, and Niklas Faber. "Performance evaluation in post integrated organic Rankine cycle systems : A study on operational systems utilizing low grade heat." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-150371.
Повний текст джерелаMendonça, Caio Henrique Chrisóstomo. "Detecção e correção de perdas de ciclos para dados GPS de tripla frequência /." Presidente Prudente, 2019. http://hdl.handle.net/11449/183236.
Повний текст джерелаResumo: A observável fase da onda portadora é utilizada quando se deseja obter alta acurácia no posicionamento por sistemas globais de navegação por satélite. Mas, esta observável pode sofrer perdas de ciclos durante o rastreamento do sinal. Uma perda de ciclo é uma descontinuidade de um número inteiro de ciclos na fase da onda portadora, causada por uma perda temporária de rastreamento do sinal pelo receptor. Assim, as perdas de ciclos devem ser detectadas e corrigidas para que se obtenha posicionamento acurado. Diversos métodos foram desenvolvidos com esse objetivo. Algo que também vem sendo amplamente estudado é a detecção das perdas de ciclos nos novos sinais GPS. O advento da terceira frequência disponibilizada a partir da modernização do GPS também deve ser explorado. Na presente pesquisa buscou-se estudar os diferentes métodos de detecção e correção de perdas de ciclos e implementar o mais adequado para o posicionamento de alta acurácia no Brasil. Foram selecionadas duas metodologias para fim de detecção e correção, sendo a primeira baseada no método das triplas diferenças (TD) clássico e a segunda baseada no método de sequência de combinações lineares. Além disso, foi proposta uma terceira metodologia para melhoria do método das TD. Foram realizados dois experimentos, sendo o primeiro realizado com dados simulados e o segundo com dados reais em período de alta atividade ionosférica, e para ambos os casos foram considerados dois cenários: linha de base curta e linha de base lo... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Carrier phase observable are used in high accuracy positioning by global navigation satellite systems. However, the carrier phase measurement may suffer cycle slips during signal tracking. A cycle slip is a discontinuity of an integer number of cycles in the phase observable, caused by a temporary loss of lock in the receiver carrier tracking loop. Thus, cycle slips must be detected and corrected in order to obtain accurate positioning. Several methods were developed for this purpose. Something that has also been studied is the detection of cycle slip in the new GPS signals. The advent of the third frequency available from the GPS modernization. Should be explored in the context of cycle slip detection and correction. In the present research the different cycle slip detection and correction methods were studied and t the most suitable for the high accuracy positioning in Brazil was implemented. Two methodologies were selected for the purpose of this research, the first one based on the classical triple difference (TD) method and the second based on the linear combination sequence method. In addition, a third methodology was proposed to improve the TD method. Two experiments were performed, the first one being carried out with simulated data and the second with real data in the period of high ionospheric activity, and for both cases two scenarios were considered: short baseline and long baseline. For simulated short baseline data, the classical TD method, the proposed TD metho... (Complete abstract click electronic access below)
Mestre
Lebourgeois, Samuel. "Etude du cycle infectieux du virus de l’hépatite A (VHA) et développement d'un modèle in vitro pour mettre en évidence son infectiosité." Thesis, Paris, Institut agronomique, vétérinaire et forestier de France, 2018. http://www.theses.fr/2018IAVF0027.
Повний текст джерелаHepatitis A virus (HAV) is a fecal-oral enteric virus that causes acute hepatitis. After entering the body orally, HAV interacts with the intestinal epithelium that it must cross to reach the liver via the bloodstream. HAV is to date the second viral etiological agent that can be involved in collective foodborne illness (TIAC). To assess the risk in food virology, the detection of RNA remains insufficient for the detection of infectious virions. Today, cultivating wild strains of HAV is difficult: they replicate very slowly in culture (release of new virions synthesized in Frhk-4 cells from 30-45 days) without inducing cytopathic effect (CPE). In contrast, some culturally adapted HAV strains are capable of inducing CPE resulting from apoptotic death of infected cells. My thesis work aimed to develop a new method of impedance detection of infectious viral particles of HAV in the context of viral diagnosis in food.In this study, using xCELLigence technology, the evaluation of the Real Time Cell Analysis (RTCA) system was undertaken to detect the ECP of the HAV adapted strain. (HM175 / 18f) on FRhK-4 cells. The results showed that cell impedance kinetics, during HAV infection, induced a decrease in cell index (CI) correlated with the occurrence of HAV-induced cell death. In addition, the time required for the fall in HAV-induced IC values was depending on the viral concentration. A linear relationship of 5 log10 could be established between the HAV concentration and the time required to reach 50% of the decrease in IC values (TdCI50), showing that RTCA monitoring could be used as an infectious HAV test method. In addition, RTCA monitoring can be performed in less than six days instead of 12 to 14 days with standard lysis range assays. Therefore, the titration method based on RTCA monitoring is a powerful tool for the evaluation of viral inactivation and antiviral treatments.Moreover, in order to be able to reproduce ECP in wild HAV strains, the pro-apoptotic caspase-dependent signalling pathways involved in apoptotic cell death of cells infected with the adapted strain were studied. From previous results showing the activation of caspase 3 during the infection of FRhK-4 cells by the HM175 / 18f strain of HAV, the extrinsic and mitochondrial pro-apoptotic pathways were identified. The expression of caspase 8, a marker of the extrinsic pathway, correlated with the expression of active caspase 3 as well as tBid protein was observed. In addition, the expression of the tBid protein induced the release of cytochrome c suggesting activation of the extrinsic pathway-dependent mitochondrial pathway. Therefore, a comparison of survival and cell death pathways during infection with wild-type strains and adapted to HAV can be performed in future work. Thus, the results offer new insights into the understanding of viral strategy for inducing ECP in host cells.In conclusion, beyond a better understanding of the pathophysiology of HAV, this study contributes to the development of cellular models to detect infectious particles of wild strains of HAV. In addition, RTCA monitoring in HAV inactivation studies will improve the assessment of viral risk in food virology by controlling the transmission of viruses through their elimination from food. This is also an important public health challenge to help reduce the burden of food-borne viral diseases
Abdullah, Hanifa. "A risk analysis and risk management methodology for mitigating wireless local area networks (WLANs) intrusion security risks." Diss., Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-10122006-155850.
Повний текст джерелаSoames, Kieron, and Jonas Lind. "Detecting Cycles in GraphQL Schemas." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-156174.
Повний текст джерелаBERNA, ANNE. "Les proteines non structurales du virus de la mosaique de la luzerne : immunodetection et role possible dans la multiplication du virus." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13039.
Повний текст джерелаCronje, Mercia. "Engineering process model: Detection of cycles and determination of paths." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2376.
Повний текст джерелаIn order to plan the engineering work of large construction projects efficiently, a model of the engineering process is required. An engineering process can be modelled by sets of persons, tasks, datasets and tools, as well as the relationships between the elements of these sets. Tasks are more often than not dependent on other tasks in the engineering process. In large projects these dependencies are not easily recognised, and if tasks are not executed in the correct sequence, costly delays may occur. The homogeneous binary relation “has to be executed before” in the set of tasks can be used to determine the logical sequence of tasks algebraically. The relation can be described by a directed graph in the set of tasks, and the logical sequence of tasks can be determined by sorting the graph topologically, if the graph is acyclic. However, in an engineering process, this graph is not necessarily acyclic since certain tasks have to be executed in parallel, causing cycles in the graph. After generating the graph in the set of tasks, it is important to fuse all the cycles. This is achieved by finding the strongly connected components of the graph. The reduced graph, in which each strongly connected component is represented by a vertex, is a directed acyclic graph. The strongly connected components may be determined by different methods, including Kosaraju’s, Tarjan’s and Gabow’s methods. Considering the “has to be executed before” graph in the set of tasks, elementary paths through the graph, i.e. paths which do not contain any vertex more than once, are useful to investigate the influence of tasks on other tasks. For example, the longest elementary path of the graph is the logical critical path. The solution of such path problems in a network may be reduced to the solution of systems of equations using path algebras. The solution of the system of equations may be determined directly, i.e. through Gauss elimination, or iteratively, through Jacobi’s or Gauss-Seidel’s methods or the forward and back substitution method. The vertex sequence of an acyclic graph can be assigned in such a way that the coefficient matrix of the system of equations is reduced to staggered form, after which the solution is found by a simple back substitution. Since an engineering process has a start and an end, it is more acyclic than cyclic. Consequently we can usually reduce a substantial part of the coefficient matrix to staggered form. Using this technique, modifications of the solution methods mentioned above were implemented, and the efficiency of the technique is determined and compared between the various methods.
Capelle, Bailey A. "Contextualizing Chester Himes's Trajectory of Violence Within the Harlem Detective Cycle." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1430813651.
Повний текст джерелаXiang, Yusheng, and Marcus Geimer. "Optimization of operation strategy for primary torque based hydrostatics drivetrain using artificial intelligence." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71073.
Повний текст джерелаSmith, David Ballin. "Increasing proliferation resistance of sodium fast reactor fuel cycle through use of a nuclear resonance fluorescence detector." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62696.
Повний текст джерела"June 2010." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 35).
The proliferation resistance of a reprocessing facility can be improved by using a novel detection system that utilizes the nuclear resonance fluorescence (NRF) phenomenon to determine the isotopic composition of materials flowing through the plant. In an aqueous reprocessing facility, the waste stream was identified as a weak point for proliferation resistance. By identifying the isotopic composition of the waste stream and monitoring levels of plutonium and uranium, greater accountancy can be maintained. After the detection system was designed, a probabilistic risk assessment method was used to evaluate the added proliferation resistance afforded by the NRF detection system and the overall proliferation resistance of the reprocessing facility to a diversion of a small quantity of material from the waste stream by two individuals. The overall probability of success for a proliferator to divert materials from a reprocessing facility utilizing an NRF detection system is 8.73* 10-5. This is a decrease, from 3.39* 104 , over the probability of success for the proliferator if the NRF detection system is not present. This decrease in proliferator success probability demonstrates and increased proliferation resistance of the reprocessing facility. The NRF detection system is shown to increase the proliferation resistance of the reprocessing facility.
by David Ballin Smith.
S.B.
Companis, Iulia. "Développement d’un dispositif expérimental dédié à la mesure des sections efficaces de capture et de fission de l’233u dans le domaine des résonances résolues." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR15224/document.
Повний текст джерела233U is the fissile nucleus produced in 232T h/233U fuel cycle which has been proposed as asafer and cleaner alternative to the 238U/239P u cycle. The accurate knowledge of the neutroncapture cross-section of this isotope is needed with high-precision for design and developmentof this fuel cycle. The only two reliable experimental data for the capture cross-section of233U show discrepancies up to 10%. These differences may be due to systematic uncertaintiesassociated with the detector efficiency, dead-time effects, background subtraction and signalpile-up caused by the α-activity of the sample. A special experimental set-up for simultaneousmeasurement of fission and capture cross sections of radioactive fissile nuclei was designed,assembled and optimized at CENBG in the frame of this work. The measurement will be per-formed at the Gelina neutron time-of-flight facility at IRMM, where neutron cross sectionscan be measured over a wide energy range with high energy resolution. The fission detectorconsists of a multi-plate high-efficiency ionization chamber (IC). The γ-rays produced in cap-ture reactions are detected by an array of six C6 D6 scintillators surrounding the IC. In thesemeasurements the radiative capture γ-rays are hidden in large background of fission γ-rays thatrepresents a challenging issue. The latter has then to be subtracted by detecting fission eventswith a very well known efficiency (VETO method). An accurate determination of this efficiencyis rather difficult. In this work we have thoroughly investigated the prompt-fission-neutronsmethod for the IC efficiency measurement, providing new insights on this method. Thanks tothis study the IC efficiency was determined with a very low uncertainty. Using a 252Cf source,several parameters (gas pressure, high voltage and the distance between the electrodes) havebeen studied to determine the behaviour of the IC in order to find the ideal operation point:a good energy separation between α-particles and fission fragments (FF) and a good timingresolution. A good α-FF separation has been obtained with a highly radioactive 233U target.Also, the pulse-shape discrimination between γ-rays and neutrons in the C6D6 detectors wasobserved at Gelina under realistic experimental conditions. To conclude, the experimentalset-up and the VETO method have been carefully checked and validated, opening the way tofuture measurements of the capture and fission cross sections of 233U
Evans, Gwynne Wheldon. "Out of the Limelight (a Cycle of Plays) and The Singing Detective and Out of the Limelight: a Comparative Study." Thesis, Bangor University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490423.
Повний текст джерелаDari, Jacopo. "Towards a better understanding of the Anthropogenic Impact on the Hydrological Cycle: Detecting and Estimating Irrigation through Remote Sensing Soil Moisture." Doctoral thesis, Universitat Ramon Llull, 2021. http://hdl.handle.net/10803/671502.
Повний текст джерелаEl riego es el principal consumo antropogénico de agua dulce. Se prevé que la explotación de los recursos hídricos para mejorar la producción de alimentos mediante prácticas de riego seguirá aumentando en los próximos decenios. De hecho, se prevé que el crecimiento demográfico y los cambios climáticos ejerzan una presión aún mayor sobre los recursos hídricos disponibles. A pesar de que el riego tiene consecuencias directas en la gestión racional de los recursos hídricos, así como en la producción de alimentos, falta un conocimiento detallado de los lugares en los que realmente se riega en todo el mundo y de cuánta agua se utiliza realmente para las prácticas de riego. En esta investigación se han elaborado métodos para detectar y cartografiar las zonas donde realmente se riega, así como métodos para estimar las cantidades de agua que se aplican para el riego; las metodologías propuestas utilizan datos de humedad del suelo provenientes de la teledetección espacial. En esta investigación se han adoptado dos casos de estudio: el primero se sitúa en la cuenca del Ebro, en el noreste de España, mientras que el otro es la cuenca del Alto Tíber, en Italia central. Se han ensayado varios productos de humedad del suelo obtenidos por teledetección con diferentes resoluciones espaciales para evaluar los que mejor funcionan en la detección del riego y, por lo tanto, en la cartografía de las zonas de regadío. Además, se han realizado estimaciones cuantitativas de las cantidades de agua aplicadas para el riego. La actividad de detección y cartografía del riego se ha llevado a cabo en ambos casos de estudio. En el español se ha evaluado inicialmente la capacidad de detección de riego de varios productos de teledetección. Se han evaluado los siguientes conjuntos de datos de humedad del suelo: SMAP (Soil Moisture Active Passive) a 1 km y 9 km, SMOS (Soil Moisture and Ocean Salinity) a 1 km, Sentinel-1 a 1 km, y ASCAT (Advanced SCATterometer) a 12,5 km. Las versiones de 1 km de SMAP y SMOS se obtienen mediante la desagregación con el método DISPATCH (DISaggregation based on Physical And Theoretical scale Change). La detectabilidad del riego por los productos considerados se ha evaluado mediante índices derivados de la teoría de la estabilidad temporal aquí utilizada bajo esta nueva perspectiva. Además, se han elaborado mapas de las zonas irrigadas producidos a través del algoritmo de agrupamiento K-medias. En las zonas agrícolas de la cuenca del Alto Tíber, en Italia, se ha realizado un análisis a doble escala. En el análisis a 1 km de resolución espacial, se ha aplicado el mismo procedimiento adoptado en el caso de estudio de la cuenca del Ebro para evaluar la detectabilidad de la irrigación mediante la humedad del suelo por teledetección. Se han utilizado los siguientes productos: SMAP a 1 km, la versión Sentinel-1 a 1 km entregada por el Copernicus Global Land Service, y una versión Sentinel-1 a escala de parcela (producida por THEIA) agregada a 1 km. Obsérvese que los dos primeros productos son los mismos que también se utilizaron en el caso de estudio español. En este análisis, así como en el realizado sobre el área de estudio en la cuenca del Ebro, se ha utilizado como soporte el modelo de superficie terrestre SURFEX-ISBA (SURface EXternalisée - Interaction Sol Biosphère Atmosphère). En el análisis a escala de parcela, los datos del THEIA Sentinel-1 agregados a 100 m se han utilizado para producir mapas de alta resolución de las zonas de regadío mediante el algoritmo de agrupamiento K-medias. La actividad de cuantificación del riego se ha llevado a cabo en la zona de estudio de la cuenca del Ebro únicamente; se han realizado dos experimentos: uno explotando SMAP con datos a 1 km de resolución y otro explotando SMOS con datos a 1 km. Ambos conjuntos de datos se han utilizado para forzar el algoritmo SM2RAIN adaptado a la estimación del riego. En el algoritmo se ha aplicado una modelización más realista del término de evapotranspiración para reproducir adecuadamente la evapotranspiración de los cultivos según el modelo de la FAO (Organización de las Naciones Unidas para la Agricultura y la Alimentación). Los análisis realizados tienen por objeto colmar las lagunas existentes en el campo de la investigación relacionada con el riego; los resultados obtenidos son útiles para evaluar el impacto de las prácticas de riego en el ciclo hidrológico.
Irrigation is the primary source of anthropogenic freshwater consumptions. The exploitation of water resources to improve the food production through irrigation practices is expected to further increase in the upcoming decades. In fact, the population growth and climate changes are expected to put even more pressure on the available water resources. Despite irrigation having direct implications on the rational management of water resources, as well as on food production, a detailed knowledge of where irrigation actually occurs worldwide and of how much water is actually used for irrigation practices is missing. In this research, approaches to detect and map areas where irrigation actually occurs, as well as methods to estimate the amounts of water applied for irrigation, have been developed; the proposed methodologies exploit remote sensing soil moisture. Two case studies have been considered in this research: the first one is located within the Ebro basin, in North-eastern Spain, while the other one is the Upper Tiber basin, in central Italy. Several remotely sensed soil moisture products at different spatial resolutions have been tested to evaluate the best performing ones in detecting irrigation signals and thus mapping irrigated areas. In addition, quantitative estimates of the water amounts applied for irrigation have been performed. The irrigation detection and mapping activity has been carried out over both case studies. In the Spanish one, the capability to detect irrigation of several remote sensing products has been initially assessed. The following soil moisture data sets have been evaluated: SMAP (Soil Moisture Active Passive) at 1 km and 9 km, SMOS (Soil Moisture and Ocean Salinity) at 1 km, Sentinel-1 at 1 km, and ASCAT (Advanced SCATterometer) at 12.5 km. The 1 km versions of SMAP and SMOS are obtained through downscaling with the DISPATCH (DISaggregation based on Physical And Theoretical scale CHange) method. The detectability of irrigation by the considered products has been assessed through indices derived from the temporal stability theory here used under this new perspective. Furthermore, maps of irrigated areas have been produced through the K-means clustering algorithm. Over the agricultural areas in the Upper Tiber basin, in Italy, a double-scale analysis has been carried out. In the analysis at 1 km spatial resolution, the same procedure adopted over the case study in the Ebro basin to evaluate the detectability of irrigation through remotely sensed soil moisture has been applied. The following products have been used: SMAP at 1 km, the Sentinel-1 at 1 km version delivered by the Copernicus Global Land Service, and a plot-scale-born Sentinel-1 version (produced by THEIA) aggregated at 1 km. Note that the first two products are the same used over the Spanish case study also. In this analysis, as well as in the one carried out over the study area in the Ebro basin, surface soil moisture simulated by the SURFEX-ISBA (SURface EXternalisée - Interaction Sol Biosphère Atmosphère) land surface model has been used as support. In the plot-scale analysis, THEIA Sentinel-1 data aggregated at 100 m have been used to produce high-resolution maps of irrigated areas through the K-means clustering algorithm. The irrigation quantification activity has been carried out over the study area in the Ebro basin only; two experiments have been performed: one exploiting SMAP at 1 km data and another one exploiting SMOS at 1 km data. Both data sets have been used to force the SM2RAIN algorithm adapted to estimate irrigation. A more realistic modeling of the evapotranspiration term has been implemented into the algorithm to properly reproduce the crop evapotranspiration according to the FAO (Food and Agriculture Organization) model. The analyses carried out are aimed at filling the existing gaps in the irrigation-related research field; the obtained results are useful to assess the impact of irrigation practices on the hydrological cycle.
L’irrigazione è la principale fonte di consumo di acqua dolce. Nei prossimi decenni è atteso un ulteriore sfruttamento della risorsa idrica per incrementare la produzione di cibo attraverso le pratiche irrigue. Si stima infatti che la crescita della popolazione e i cambiamenti climatici possano esercitare una pressione ancora maggiore sulle risorse idriche disponibili. Nonostante le importanti implicazioni che ha l’irrigazione sulla gestione razionale dell’acqua e sulla produzione di cibo, non si ha una conoscenza dettagliata di dove l’irrigazione effettivamente avvenga nel mondo e di quanta acqua venga effettivamente utilizzata per le pratiche irrigue. In questa ricerca sono stati sviluppati approcci per rilevare e mappare le aree dove effettivamente si verifica l’irrigazione e per stimare i volumi irrigui; le metodologie proposte sfruttano l’umidità del suolo rilevata da satellite. In questa ricerca sono stati considerati due casi di studio: il primo si trova nel bacino del fiume Ebro, nel Nord-Est della Spagna, mentre l’altro è il bacino superiore del Tevere, nell’Italia centrale. Diversi prodotti di umidità del suolo da satellite, caratterizzati da diverse risoluzioni spaziali, sono stati valutati al fine di determinare i più performanti nel rilevare segnali di irrigazione e quindi mappare le aree irrigate. Inoltre, sono state eseguite stime quantitative dei volumi di acqua utilizzati per pratiche irrigue. L’attività di rilievo e mappatura dell’irrigazione è stata condotta su entrambe le aree pilota. In quella spagnola, è stata valutata la capacità di rilevare l’irrigazione di diversi prodotti di umidità del suolo. Sono stati considerati i seguenti set di dati: SMAP (Soil Moisture Active Passive) a 1 km e 9 km, SMOS (Soil Moisture and Ocean Salinity) a 1 km, Sentinel-1 a 1 km e ASCAT (Advanced SCATterometer) a 12.5 km. Le versioni a 1 km di SMAP e SMOS sono ottenute tramite disaggregazione eseguita con il metodo DISPATCH (DISaggregation based on Physical And Theoretical scale CHange). La capacità di rilevare l’irrigazione da parte dei prodotti considerati è stata valutata tramite indici derivanti dalla teoria della stabilità temporale e usati in questo studio sotto una nuova prospettiva. Inoltre, sono state prodotte delle mappe delle aree irrigate attraverso l’algoritmo di classificazione K-means. Un’analisi a doppia scala spaziale è stata condotta sulle aree agricole all’interno del bacino superiore del Tevere, in Italia. Nell’ambito dell’analisi alla risoluzione spaziale di 1 km, è stata applicata la stessa procedura già adottata per il caso di studio nel bacino dell’Ebro per valutare la possibilità di rilevare l’irrigazione tramite umidità del suolo da satellite. Sono stati utilizzati i seguenti prodotti: SMAP a 1 km, la versione a 1 km di Sentinel-1 fornita da Copernicus Global Land Service e una versione di Sentinel-1 originariamente prodotta de THEIA alla scala di parcella e aggregata a 1 km. Va sottolineato che i primi due prodotti menzionati sono stati utilizzati anche sull’area pilota in Spagna. Sia in questa analisi che in quella condotta nel bacino dell’Ebro, dati di umidità del suolo superficiale modellati tramite il modello di superficie terrestre SURFEX-ISBA (SURface EXternalisée - Interaction Sol Biosphère Atmosphère) sono stati utilizzati come supporto. Nell’analisi alla scala di parcella, sono stati impiegati i dati di Sentinel-1 prodotti da THEIA e aggregati a 100 m al fine di produrre mappe di aree irrigate ad alta risoluzione tramite l’algoritmo di classificazione K-means. L’attività di quantificazione dell’irrigazione è stata finalizzata solamente per l’area pilota nel bacino dell’Ebro; sono stati condotti due esperimenti: uno utilizzando i dati da SMAP a 1 km e un altro sfruttando i dati da SMOS a 1 km. Entrambi i set di dati sono stati utilizzati per forzare la versione dell’algoritmo SM2RAIN adattata per la stima dell’irrigazione. Una modellazione più realistica dell’evapotraspirazione è stata implementata nell’algoritmo al fine di riprodurre adeguatamente l’evapotraspirazione delle colture secondo il modello FAO (Food and Agriculture Organization). Le analisi condotte sono finalizzate a colmare le lacune esistenti nel campo di ricerca relativo all’irrigazione; i risultati ottenuti sono utili per valutare l’impatto delle pratiche irrigue sul ciclo idrologico.
Companis, Iulia. "Développement d'un dispositif expérimental dédié à la mesure des sections efficaces de capture et de fission de l'233u dans le domaine des résonances résolues." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00965714.
Повний текст джерелаMarta, Michele. "The 14N(p,γ)O15 reaction studied at low and high beam energy". Forschungszentrum Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-93642.
Повний текст джерелаBouvier, des Noes Mathieu. "Détection itérative des séquences pseudo-aléatoires." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT068/document.
Повний текст джерелаPseudo-random binary sequences are very common in wireless transmission systems and ciphering mechanisms. More specifically, they are used in direct sequence spread spectrum transmission systems like UMTS or GPS, or to construct preamble sequences for synchronization and channel estimation purpose like in LTE. It is always required to synchronize the receiver with the transmitted sequence. The usual way consists in correlating the received signal with a replica of the sequence. If the correlation exceeds a predefined threshold, the synchronization is declared valid.This thesis addresses a different approach: the binary sequence is detected with a forward error correction decoding algorithm. This allows for instance to detect very long sequences.In this thesis, we show that decoding a pseudo-random sequence is a problematic of the kind ‘detect and decode'. The decoder detects the presence of the transmitted sequence and simultaneously estimates its initial state. In conventional detection theory, this corresponds to a GLRT detector that uses a decoder to estimate the unknown parameter which is the transmitted sequence. For pseudo-random sequences, the decoder implements an iterative message-passing algorithm. It uses a parity check matrix to define the decoding graph on which the algorithm applies. Each parity check equation has a weight t, corresponding to the number of variables in the equation.Parity check equations are thus an essential component of the decoder. The decoding procedure is known to be sensitive to the weight t of the parity check equations. For m-sequences, the number of parity check equations is already known. It is given by the number of codewords of weight t of the corresponding Hamming dual code. For Gold sequences, the number of parity check equations of weight t = 3 and 4 has already been evaluated by Kasami. In this thesis we provide an analytical expression for the number of parity check equations of weight t = 5 when the degree of the generator polynomial r is odd. Knowing this number is important because there is no parity check equation of weight t < 5 when r is odd. This enumeration is also used to provide an estimation of the least degree of parity check equations of weight t.We have then addressed the problem of selecting the parity check equations used by the decoder. We observed the probability of false alarm is very sensitive to this selection. It is explained by the presence or absence of absorbing sets which block the convergence of the decoder when it is fed only with noise. These sets are known to be responsible for error floor of LDPC codes. We give a method to identify these sets according to the parity check equations used by the decoder. The probability of false alarm can increase dramatically if these absorbing sets are destroyed. Then we propose an algorithm for selecting these parity check equations. It relies on the minimization of the number of cycles of length 6 and 8. Simulation show that the algorithm allows to improve significantly the probability of false alarm and the average acquisition time.Eventually, we propose 2 algorithms for the detection of the scrambling codes used in the uplink of UMTS-FDD and CDMA2000 systems. They highlights a new vulnerability of DSSS transmission systems. It is now conceivable to detect these transmission if the sequence's generator is known
Falk, Jenny. "On Pollard's rho method for solving the elliptic curve discrete logarithm problem." Thesis, Linnéuniversitetet, Institutionen för matematik (MA), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-85516.
Повний текст джерелаQuinane, Luke. "An Examination of Deferred Reference Counting and Cycle Detection." Thesis, 2003. http://hdl.handle.net/1885/42030.
Повний текст джерелаWang, Ching-yao, and 王敬堯. "Distributed Boundary Detection in Wireless Sensor Networks using Cycle Tests." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/75974052356052603542.
Повний текст джерела國立臺灣科技大學
資訊工程系
96
We propose a novel approach using a distributed algorithm for boundary detection in wireless sensor networks. The sensor networks we consider are selforganizing and with a reasonable density and communication ranges. Our approach does not require any localization information and only uses the connectivity information of the network. The algorithm divides the network into several clusters, then pieces the partial boundaries into one. We use the fact that a hole in the covered area is separated by some groups, and nodes from di erent groups can jointly find the boundary of the hole. We also use the property that more than one neighbor of a boundary node should also be in the boundary. With the sub-network formed by node’s 1-hop and 2-hop neighbors, every node can decide whether it is a boundary node. Our experiments show that our approach can find the boundaries of holes e ciently.
Chen, ZhengToang, and 陳正唐. "Application of Wavelet Transformation for Cycle Slip Detection, Repair, and Baseline Resolution." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/18236536522904671366.
Повний текст джерела國立交通大學
土木工程系
89
In order to attain high precision positioning and navigation results with GPS, cycle slips must be correctly repaired at the data preprocessing stage. A slip of only a few cycles can bias measurements enough to make centimetre-level positioning or navigation difficult. What is a Cycle Slip? Briefly it is a sudden integer number of cycles jump in the carrier phase observable caused by the loss of lock of the receiver phase lock loops. Currently, the source for cycle slips can be distinguished in (1) Obstructions of the satellite signal due to surrounding interference. (2) Low SNR ( Signal to Noise Ratio ) due to ionospheric delay, multipath effect, bad DOP…,etc. (3)Failure in the receiver software. For the most part, techniques used in the detection and determination of cycle slips have not changed drastically since the first methods were devised in the early 1980s. The focus has always been on taking cycle slip into the discontinuity of phase observation, and to judge which is the better way for cycle slip detection depends on the tool you use. In this thesis, we develop a new way by using Wavelet transformation. On using this method, we can detect tiny slips and repair other tinier cycle slips and noise by using wavelet decomposition and de-noising. In the same observed sessions, we can get more precise positioning and baseline resolution.
Lin, Kai-shun, and 林楷舜. "A Fast Digital Duty Cycle Detection and Pulsewidth Generator Pulsewidth Lock Loops." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/75525663954225664636.
Повний текст джерела國立雲林科技大學
電子與光電工程研究所碩士班
100
In high speed circuit, clock signal has to be highly stable. However, the many buffer stages in the circuit may impose unexpected effect on clock duty cycle (pulsewidth), which in term lower the circuit performance. Traditional pulsewidth locked circuit requires longer lock time, which may affect the functioning of digital system. This thesis proposed a pulsewidth locked circuit that can quickly detect pulse cycle and produce pulses. The pulsewidth locked circuit used a delay line to adjust and detect pulse simultaneously. Through the hardware-sharing mechanism, the proposed circuit successfully reduced its hardware area. Under the same delay-cell resolution, the circuit adapted a 128-bit pulsewidth detector in 128-bit thermometer code. Then we used thermometer-to-binary circuit to quickly transformed the thermometer code to 7-bit pulse code, which, when compared with traditional application of using shift register to count cycle number, can greatly reduce lock time. As for the correction circuit we applied a half-cycle converter, which can lock pulsewidth to 50% in one circuit operation. Since the circuit was limited by internal circuit delay when operated with high frequency, we proposed a high-speed, many-to-one CMOS multiplexer to solve this problem. The proposed multiplexer was composed of 8 pairs of level 16 transmission gates and 7 pairs of 2-1 CMOS multiplexers. When compared to traditional many-to-one multiplexer, the proposed multiplexer was not only with smaller area, its circuit delay time was also smaller due to the reduced multiplexer levels, thus enhance the overall speed and performance of the pulsewidth lock loops. The pulsewidth lock circuit was simulated by 0.18um CMOS process under VDD 1.8V. With layout verification, the operating frequency range was between 100 MHz~400 MHz. When the operating frequency was 400 MHz, the power consumption of the proposed pulsewidth lock loops was 14mW, the maximum pulsewidth error was within 3%, and 50% duty cycle can be locked within only 6 clock cycles.
Chen, Shih-Yin, and 陳思穎. "The Multiscale HHT-Based Signal Separation Method for GPS Cycle-Slip Detection." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/71774416394557682302.
Повний текст джерела國立臺灣海洋大學
通訊與導航工程學系
101
Cycle slip can cause discontinuous integer cycle jumps in phase measurements, it can lead to significant positioning errors, detecting and correcting cycle-slip is an important issue for GNSS relative positioning. In this paper, Multiscale Hilbert-Huang Transform (M-HHT) method is proposed to deal with the problem. The proposed method consists of three steps. Firstly, a time-difference GNSS phase measurement is decomposed into a trend signal and a finite number of intrinsic mode functions (IMFs) by EMD. Secondly, a “cycle-slip signal” is obtained by M-HHT. Finally, an edge detection operator is applied on the “cycle-slip signal” to detect and repair the cycle-slip. The experimental results show that the M-HHT method has better performance than the conventional EMD-based filters, and the success rate of cycle slip detection is up to 100 % (15° mask angle) in various simulated scenarios and real data over multiple days. The results confirm that the proposed algorithm is applicable for relative positioning.
Karaim, MALEK. "Real-time Cycle-slip Detection and Correction for Land Vehicle Navigation using Inertial Aiding." Thesis, 2013. http://hdl.handle.net/1974/8026.
Повний текст джерелаThesis (Master, Electrical & Computer Engineering) -- Queen's University, 2013-05-06 18:11:57.076
Kuo, Chu-Wei, and 郭築衛. "Maximum Duty Cycle Enhancement of Capacitor Voltage Detection and Control in Buck Converter with Bootstrapped Capacitor." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/37593308146516682232.
Повний текст джерела國立交通大學
電機學院電機與控制學程
100
Capacitor voltage detection with adequate charge time control is proposed in DC-DC buck converter with the bootstrapped capacitor in this thesis. N-channel MOSFET is widely used as the high-side power switch of DC-DC buck converter due to small silicon area and low equivalent turn-on resistance. However, the N-channel MOSFET needs bootstrapped capacitor to provide enough gate-source voltage for lowering equivalent turn-on resistance and thus enhancing power conversion efficiency. The bootstrapped capacitor needs to be charged frequently because the voltage across it decreases when it drives the gate driver of the N-channel MOSFET. Thus maximum duty cycle setting that uses the off time of high-side power switch during every period to charge bootstrap capacitor is popularly used in conventional methods. Thus, it can lead to stable system but it limits the maximum applicable output voltage and reduces the flexibility of DC-DC buck converter. Therefore, the ability of capacitor voltage detection and charge time control can increase the achievable output voltage level. In the meanwhile, the extra power dissipation is smaller than 11 μA with a low complexity in the circuit design. The output voltage can be close to 98.5 % of input voltage when the load current is 2 A with the ripple voltage smaller than 2 % of the output voltage. Furthermore, the reduced operation frequency near 1/50 of original oscillator frequency can effectively improve the power conversion efficiency due to the reduction of the switching loss. The error percentage of capacitor voltage detection is lower than 2 % compared with the reference voltage. The simulation results that the system is stable when the output voltage approaches the input voltage, that is, the duty is close to 100%. Compared with the conventional maximum duty cycle control techniques, the limit of the applicable output voltage is much improved to 98.5 % with high efficiency and low output voltage ripple.