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1
Evans, Joshua L. "SMALL SATELLITE NONCOMMUTATIVE ROTATION SEQUENCE ATTITUDE CONTROL USING PIEZOELECTRIC ACTUATORS." UKnowledge, 2016. http://uknowledge.uky.edu/ece_etds/91.
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Attitude control remains one of the top engineering challenges faced by small satellite mission planning and design. Conventional methods for attitude control include propulsion, reaction wheels, magnetic torque coils, and passive stabilization mechanisms, such as permanent magnets that align with planetary magnetic fields. Drawbacks of these conventional attitude control methods for small satellites include size, power consumption, dependence on external magnetic fields, and lack of full control authority. This research investigates an alternative, novel approach to attitude-control method for small satellites, utilizing the noncommutative property of rigid body rotation sequences. Piezoelectric bimorph actuators are used to induce sinusoidal small-amplitude satellite oscillations on two of the satellites axes. While zero net change occurs on these signaled axes, the third axis can develop an average angular rate. This noncommutative attitude control methodology has several advantages over conventional methods, including scalability, power consumption, and operation outside of Earth's magnetic field. This research looks into the feasibility of such a system, and lays the foundation for a simple control system architecture.
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Abou-Loukh, S. J. "Petri nets for computer sequence generation to control batch processes." Thesis, University of Bradford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355212.
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Matoug, Mahmoud M. "An investigation of misinformation and production control implementation sequence using discrete linear control." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/19487.
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Discrete linear control theory is used in this research to examine the effects of system choice and data errors on the performance of production control systems. Two common information flow systems are modelled. These are the Reorder Cycle (ROC) and the Material Requirements Planning (MRP) systems. System choices include the choice of forecasting method, the choice of delivery policy, and the choice of inventory rule. The source of data errors include stock recording errors, delay in stock recording, incorrect bills of material. The other part of the research examines the sequence of implementing a new production control system. Different ways of moving from a Reorder Cycle to a Material Requirements Planning system are studied. Guidelines for an implementation sequence are produced.
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Mora, Castro Andrés Felipe. "Optimal switching sequence model predictive control for power electronics." Tesis, Universidad de Chile, 2019. http://repositorio.uchile.cl/handle/2250/170522.
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Tesis para optar al grado de Doctor en Ingeniería EléctricaEn este proyecto de tesis, se propone una estrategia de control predictivo (MPC, por sus siglas en inglés) basada en el concepto de secuencia de conmutación óptima (OSS) recientemente introducido para convertidores de punto neutro enclavado de tres niveles (3L-NPC) conectados a la red eléctrica. La metodología de control propuesta, llamada OSS-MPC en cascada (C-OSS-MPC), considera explícitamente el modulador en su formulación junto con el modelo del sistema. Como se verificó a lo largo de esta tesis, la estrategia C-OSS-MPC está formulada para el control de la corriente o el control directo de la potencia activa/reactiva como variables primarias de control, mientras que el problema del equilibrio de voltaje del enlace CC se resuelve sin utilizar factores de ponderación en un bucle de control interno basado en una novedosa y sencilla estrategia de control MPC. Por lo tanto, la metodología de control propuesta controla de manera óptima tanto el objetivo de control primario como los voltajes de los condensadores de este convertidor de potencia. Bajo esta perspectiva, la dificultad de diseñar el factor de ponderación se evita en este trabajo y el rendimiento del sistema controlado no se ve afectado por un punto de operación particular del convertidor conectado a la red. La estrategia MPC resultante permite operar el convertidor con un espectro armónico predefinido, frecuencia de conmutación fija y una respuesta dinámica rápida y robusta en todo el rango operativo del convertidor de potencia, superando las estrategias MPC existentes en la literatura para los convertidores de potencia. Además, se ha propuesto un nuevo y eficiente algoritmo de optimización para encontrar rápidamente la solución óptima con el fin de hacer posible una implementación en tiempo real de la estrategia de control propuesta. Finalmente, se proporcionan resultados experimentales y de simulación para demostrar la efectividad y el rendimiento de alta calidad de la estrategia de control propuesta, lo que hace que este enfoque de control no solo sea adecuado para las aplicaciones de convertidor de potencia conectado a la red, sino que también para accionamientos eléctricos de alta potencia.
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Smith, Derek M. "The compass of control: Congruency sequence effects, boundaries, and task sets." Thesis, Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55028.
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The congruency sequence effect literature is inconsistent when it comes to the issue of the boundaries of this phenomenon. Some have argued that control is implemented at the level of a stimulus dimension while other have claimed that control operates across dimensions and tasks. Flexible control boundaries defined by task sets might explain the inconsistent findings. Response set manipulations have been shown to influence control boundaries. Unitary response sets can produce cross-dimension congruency sequence effects but applying separate response sets to a task can lead to the absence of the congruency sequence effect on dimension switch trials. This thesis is concerned with the extension of these findings. The study applied response set manipulations to a paradigm (Stroop Trajectory Task) that has exhibited robust crossdimension congruency sequence effects. In addition, the influence of switching routine on congruency sequence effects was tested. It was expected that separate response sets
for different stimulus dimensions would eliminate the congruency sequence effect on switch trials. Switching routine was anticipated to act as a weaker boundary marker but
nevertheless it was expected that systematic switching routines should have at least attenuated the congruency sequence effect on switch trials. Contrary to expectations it
was found that the congruency sequence effect was present in switch trials across all conditions.
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Fischer, Jörg [Verfasser]. "Optimal Sequence-Based Control of Networked Linear Systems / Jörg Fischer." Karlsruhe : KIT Scientific Publishing, 2015. http://www.ksp.kit.edu.
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Cloud, D. J. "A weighting sequence approach to the analysis and design of multivariable control systems." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233477.
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Popescu, Mihail. "New sequence processing algorithms using hidden Markov models /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p3115580.
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Ibrahim, Muhammad. "Hybrid modelling and sequence control for a laboratory-scale rolling mill." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251207.
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Nicholass, Fiona J. "Functional analysis and sequence of the tomato polygalacturonase gene control regions." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260532.
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Nishimori, Kana. "Molecular Design for Precise Sequence Control and Functions of Alternating Copolymers." Doctoral thesis, Kyoto University, 2020. http://hdl.handle.net/2433/253306.
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京都大学0048
新制・課程博士
博士(工学)
甲第22470号
工博第4731号
新制||工||1739(附属図書館)
京都大学大学院工学研究科高分子化学専攻
(主査)教授 大内 誠, 教授 秋吉 一成, 教授 竹中 幹人
学位規則第4条第1項該当
Doctor of Philosophy (Engineering)
Kyoto University
DGAM
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Kalionis, Bill. "The early control region of temperate coliphage 186 : sequence and transcription studies /." Title page, contents and summary only, 1985. http://web4.library.adelaide.edu.au/theses/09PH/09phk14.pdf.
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Hopkinson, Peter. "A new approach to the development and maintenance of industrial sequence logic." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/32527.
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This thesis is concerned with sequence logic as found in industrial control systems, with the focus being on process and manufacturing control systems. At its core is the assertion that there is a need for a better approach to the development of industrial sequence logic to satisfy the life-cycle requirements, and that many of the ingredients required to deliver such an approach are now available. The needs are discussed by considering the business case for automation and deficiencies with traditional approaches. A set of requirements is then derived for an integrated development environment to address the business needs throughout the control system life-cycle. The strengths and weaknesses of relevant control system technology and standards are reviewed and their bias towards implementation described. Mathematical models, graphical methods and software tools are then assessed with respect to the requirements for an integrated development environment. A solution to the requirements, called Synect is then introduced. Synect combines a methodology using familiar graphical notations with Petri net modelling supported by a set of software tools. Its key features are justified with reference to the requirements. A set of case studies forms the basis of an evaluation against business needs by comparing the Synect methodology with current approaches. The industrial relevance and exploitation are then briefly described. The thesis ends with a review of the key conclusions along with contributions to knowledge and suggestions for further research.
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Tanenbaum, Michael David. "Control of angiogenic responses through an evolutionary conserved sequence of fibroblast growth factor." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/20209.
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Cura, Boris. "Product scheduling for the makespan problem with sequence dependent setup times." Ohio : Ohio University, 1993. http://www.ohiolink.edu/etd/view.cgi?ohiou1175195681.
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Siscan, Olga. "Single-chain technology using sequence-controlled precursors." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAF012/document.
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Dans cette thèse, de nouveaux systèmes macromoléculaires ont été conçus et synthétisés dans le but de former de nouvelles structures complexes basées sur des systèmes à chaîne polymère unique. Dans la première partie de ce projet, des chaînons contenant des groupements fonctionnels positionnés de manière précise ont été préparés avec succès dans le but de former des machines moléculaires de type rotaxane. Dans la seconde étude, des origamis macromoléculaires repliés ont été étudiés, et plus particulièrement des chaînes uniques à topologies complexes telles que des composés pseudocycliques ou noué. Ces topologies ont été obtenus en utilisant des ponts disulfures pouvant être positionnés à divers endroits de la chaîne polymère et grâce à des auto-associations intramoléculaires de type métal-ligand. Le placement des groupements fonctionnels et des ponts intramoléculaires dans les chaînes polymères a été rendu possible par le contrôle des séquences de monomères, en s’appuyant sur la cinétique de copolymérisation de monomères styrèniques (donneurs d’électrons) avec des monomères de type maléimides N-substitués (accepteurs). En effet, l’ajout de maléimides N-substitués à des temps contrôlés dans la chaîne de polystyrène en croissance, au moyen de techniques de polymérisations radicalaires contrôlées (vivantes) s’est avéré être une stratégie efficace et rapide pour la régulation de la séquence de monomères dans la chaîne polymèreIn this thesis, new macromolecular systems for single-chain technology were designed and synthesized. In the first study, tracks containing precisely positioned functional groups for single-chain rotaxane-based molecular machines were successfully prepared. In the second study, folded macromolecular origami were investigated, and specifically single-chain complex topologies such as pseudocyclic (Q-shaped) and knotted (α-shaped) using positionable disulfide bridges and intramolecular metal-ligand self-associations. The placement of functional moieties and intramolecular bridges in polymer chains was possible due to the monomer sequence control, by relying on the kinetics of copolymerization of donor styrenic monomer with acceptor N-substituted maleimide monomers. Indeed, time-controlled monomer additions of N-substituted maleimides into growing polystyrene chains by means of controlled/living radical polymerization techniques proved to be a convenient, rapid and scalable strategy for sequence regulation
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Xi, Min. "Image sequence guidance for mobile robot navigation." Thesis, Queensland University of Technology, 1998. https://eprints.qut.edu.au/36082/1/36082_Xi_1998.pdf.
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Vision based mobile robot navigation is a changeling issue in automated robot control. Using a camera as an active sensor requires the processing of a huge amount of visual data that is captured as image sequence. The relevant visual information for a robot navigation system needs to be extracted from the visual data and used for a real-time control. Several questions need to be answered including:1) What is the relevant information and how to extract it from a sequence of 2D images?
2) How to recognise the 3D surrounding environment from the extracted images?
3) How to generate a collision-free path for robot navigation?
This thesis discusses all three questions and presents the design of a complete vision based mobile robot navigation system for an a priori unknown indoor environment. The image sequence is captured continuously via an on-board camera during robotnavigation. The movement of the robot with mounted camera causes an optical flow of image points which are utilised for extraction of three dimensional information and the
estimation of robot motion in the scene. The developed algorithm of image sequence processing is designed with emphasis on speed such that the system can be fast enough to meet the real-time control requirement.
The introduction of a reference image enables the prediction of regions of interest in the
image sequence for reducing computational complexity. The system is able to recognise
three-dimensional surroundings from the image sequence and to reconstruct them into atwo-dimensional map with information about the location of obstacles. From this map, a collision-free path is generated with the grid potential algorithm used for robot navigation. Furthermore, the system has the capabilities of learning and establishing the geometric construction of the building by exploration which is the first step in building a preliminary artificial intelligent mobile robot.
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Leer, Roald Bræck. "Self-Optimizing Control Structures for Active Constraint Regions of a Sequence of Distillation Columns." Thesis, Norges Teknisk-Naturvitenskaplige Universitet, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-21117.
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Investigating and mapping active constraint regions for processes, and subsequently finding control structures for each region, is vital for their optimal operation. In this work, active constraint regions of three different case studies for the distillation process have been investigated:• A single distillation column with constant product prices.• A single distillation column with purity dependent prices.• Two distillation columns in sequence with constant prices.The active constraint regions for each case study have been identified and mapped with respect to the disturbances; energy price and feed flow rate. Selected stage temperatures and combinations of stage temperatures have been proposed as self – optimizing variables for the unconstrained degrees of freedom of each region. These were found by the use of the Minimum Singular Value Rule and the Exact Local Method. The methods requires the optimal sensitivities of measurements with respect to disturbances, which was obtained by using the software package Ipopt/sIpopt.To demonstrate applicability, a selection of the control structures for the different regions of each case study have been implemented and compared on the dynamic nonlinear models using Simulink.It has been shown that the first case study, a single distillation column with constant product prices, has 3 active constraint regions while the next, a single distillation column with purity dependent prices, has 5 active constraint regions. The last case study, two distillation columns in sequence with constant prices, has 8 active constraint regions.
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Angleby, Helen. "Analysis of domestic dog mitochondrial DNA sequence variation for forensic investigations." Licentiate thesis, Stockholm, Kungl. tekniska högskolan (KTH), 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299.
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Bryan, Everett A. "Cooperative Target Tracking Enhanced with the Sequence Memoizer." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3814.
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Target tracking is an important part of video surveillance from a UAV. Tracking a target in an urban environment can be difficult because of the number of occlusions present in the environment. If multiple UAVs are used to track a target and the target behavior is learned autonomously by the UAV then the task may become easier. This thesis explores the hypothesis that an existing cooperative control algorithm can be enhanced by a language modeling algorithm to improve over time the target tracking performance of one or more ground targets in a dense urban environment. Observations of target behavior are reported to the Sequence Memoizer which uses the observations to create a belief model of future target positions. This belief model is combined with a kinematic belief model and then used in a cooperative auction algorithm for UAV path planning. The results for tracking a single target using the combined belief model outperform other belief models and improve over the duration of the mission. Results from tracking multiple targets indicate that algorithmic enhancements may be needed to find equivalent success. Future target tracking algorithms should involve machine learning to enhance tracking performance.
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Chen, Kanglin [Verfasser], Dirk [Akademischer Betreuer] Lorenz, and Peter [Akademischer Betreuer] Maaß. "Optimal Control based Image Sequence Interpolation / Kanglin Chen. Gutachter: Dirk Lorenz ; Peter Maaß. Betreuer: Dirk Lorenz." Bremen : Staats- und Universitätsbibliothek Bremen, 2011. http://d-nb.info/1071898078/34.
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McMahan, Ryan Patrick. "Exploring and Evaluating Task Sequences for System Control Interfaces in Immersive Virtual Environments." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/33555.
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System control â the issuing of commands â is a critical, but largely unexplored task in 3D user
interfaces (3DUIs) for immersive virtual environments (IVEs). System control techniques are
normally encompassed by complex interfaces that define how these interaction techniques fit
together, which we call system control interfaces (SCIs). Creating a testbed to evaluate these
SCIs would be beneficial to researchers and would lead to guidelines for choosing a SCI for
particular application scenarios. Unfortunately, a major problem in creating such a testbed is the
lack of a standard task sequence â the order of operations in a system control task.
In this research, we identify various task sequences, such as the Action-Object and Object-
Action task sequences, and evaluate the effects that these sequences have on usability, in hopes
of establishing a standard task sequence. Two studies were used to estimate the cognitive effort
induced by task sequences and, hence, the effects that these sequences have on user performance.
We found that sequences similar to the Object-Action task sequence induce less cognitive time
than sequences similar to the Action-Object task sequence. A longitudinal study was then used to
analyze user preferences for task sequences as novices became experienced users with using an
interior design application. We found that novices and experienced users alike prefer sequences
like the Object-Action over sequences like the Action-Object task sequence.Master of Science
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Ray, Anil Kumar. "Influence of cutting sequence and time effects on cutters and roof falls in underground coal mine numerical approach /." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10026.
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Thesis (Ph. D.)--West Virginia University, 2009.Title from document title page. Document formatted into pages; contains xvi, 285 p. : ill. (some col.), col maps. Includes abstract. Includes bibliographical references (p. 278-285).
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Machent, Philip Geoffrey. "Sequence stratigraphic control on carbonate cementation in distal shallow marine sandstones : Upper Cretaceous Book Cliffs, Utah, USA." Thesis, Manchester Metropolitan University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269019.
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Barozzi, I. G. "OVERLAPPING SEQUENCE FEATURES OF MAMMALIAN ENHANCERS COORDINATELY CONTROL ENGAGEMENT OF TRANSCRIPTION FACTOR CONSENSUS SITES AND NUCLEOSOMAL OCCUPANCY." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/234131.
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In mammalian cells transcription factors (TFs) bind only to a small fraction of the available consensus sites in the genome. In particular, they prefer sites embedded in regions of computationally predicted high nucleosomal occupancy. This is compatible with non-exclusive mechanisms of nucleosome-driven TF-binding and nucleosome-mediated masking of TF binding sites, suggesting that TFs, and in particular pioneers, must overcome a strong barrier in order to engage binding. Exploiting the available information for the hematopoietic master regulator Pu.1, we applied machine learning approaches and uncovered the sequence-encoded information that discriminates engaged from non-engaged genomic consensus sites. We identified a minimal set of features which predicts Pu.1 binding with 78% accuracy, among which sequence determinants able to drive nucleosome occupancy were found. Consistent with this, while Pu.1 maintained nucleosome depletion at many thousand cell type-specific enhancers in macrophages, these site are otherwise occupied by nucleosomes in other cell types and in in vitro reconstituted chromatin. As predicted, engaged consensus sites showed higher sequence-encoded nucleosome occupancy compared to the myriad of non-occupied (and likely non-functional) consensus sites that randomly occur in mammalian genomes. The same sequence features selected in machine learning also explains up to 45% of the variability observed in the nucleosome occupancy in cells where Pu.1 is not expressed (a performance equal or better than what achieved by ad hoc models), suggesting that the same information contributes to nucleosome occupancy and positioning. These data reveal a basic organizational principle of mammalian enhancers whereby TF-engagement at its consensus sites and nucleosome occupancy are coordinately controlled by overlapping sequence features. This model also suggests that co-evolution of these features may be crucial to ensure cell-type specific enhancer activation. The nucleosomal patterns at Pu.1-bound sites in macrophages were further characterized, uncovering distinct subtypes with different DNA sequence composition, which mirror distinctive nucleosomal configurations either in the presence or in the absence of Pu.1.
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Subramaniam, V. R. "Cloning, characterisation and sequence comparison of sodium channel genes from Pyrethroid-resistant and susceptible strains of Heliothis virescens (Fab.) (Lepidoptera: Noctuidae)." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360077.
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Strack, Gamze. "Braced for action control." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2013. http://dx.doi.org/10.18452/16737.
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Die vorliegende Dissertation beinhaltet drei Studien, welche die kognitiven und neuronalen Grundlagen der Kontrollregulation – ausgelöst durch vorherige Konflikte, konfliktankündigende Hinweise sowie Arousal – untersuchen. Jede Studie basierte auf Interferenzaufgaben mit Durchgängen, die Reaktionskonflikt auslösten (inkompatibel) oder nicht (kompatibel). Studie 1 untersuchte, ob Abfolge abhängigen Verhaltensanpassungen äquivalent sind mit erwartungsbasierten Kontrollprozessen, die durch Hinweise auf die Kompatibilität der nächsten Aufgabe ausgelöst werden. Behaviorale und elektroenzephalographische (EEG) Maße belegten, dass diese Prozesse dissoziieren. Die kontingente negative Variation (CNV), eine EEG Komponente, die Aufgabenantizipation indiziert, zeigte, dass von der Abfolge anhängige Kontrollanpassungen bereits zwischen den Durchgängen agieren. Studie 2 fokussierte auf Prozesse und neuronale Substrate der Kontrollantizipation durch Hinweise. Kompatibilitätshinweise begünstigten effektiv die Leistung, vergrößerten die CNV vor dem nächsten Durchgang und reduzierten konfliktbezogene Konfliktverarbeitung, wie sie durch die N2 Komponente indiziert wird. Im Gegensatz zur Kontrollbedingung gab es keine Anzeichen von Reaktionskonflikt, was auf präemptive Strategien hinweist (d.h. a priori Konfliktverhinderung durch Umschreibung von Bedingungs-Handlungs-Regeln). Funktionelle Bildgebung bestätigte dies, da sie Beteiligung neuronaler Netzwerke zeigte, die eher mit Regelelaboration und –aufrechterhaltung einhergehen als mit Konfliktüberwachung und –lösung. Studie 3 untersuchte das Verhältnis von Handlungskontrolle und Arousalniveau. Toninduziertes Arousal verbesserte Leistung in inkompatiblen und kompatiblen Durchgängen, wobei letztere stärker begünstigt wurden. N1 und N2 im EEG wiesen darauf hin, dass die Effekte auf bessere frühe perzeptuelle Diskriminierung und Aufmerksamkeitszuteilung zurückgehen.The present dissertation contains three studies that investigated the cognitive and neuronal basis underlying action control regulation prompted by prior conflicts, cues predicting conflict, as well as the state of arousal. These studies were based on inference paradigms involving trials that either induced response conflict (incompatible trials) or did not (compatible trials). Study 1 examined whether behavioral adjustments due to the trial sequence are equivalent to expectancy-based adjustments triggered by cues predicting compatibility. Behavioral and electroencephalographic (EEG) measures showed dissociation of these processes. The contingent negative variation (CNV), a pre-target EEG component indexing task anticipation, further indicated that sequence-related control adjustments already act in the intertrial interval. Study 2 focused on processes and neural substrates underlying cue-based anticipatory control. Cues predicting compatibility effectively benefitted behavioral performance, enhanced the pre-target CNV, and reduced post-target conflict-related processing, as indicated by the N2 component. In contrast to the control condition, indicators of response conflict were absent, a result pointing to conflict preemption strategies (a priori avoidance of conflict via transformation of condition-action rules). Functional neuroimaging fostered this conclusion by showing the involvement of neuronal networks associated with rule elaboration and maintenance rather than with conflict monitoring or resolution. Study 3 investigated the interrelation of action control and the state of arousal. Tone-induced arousal improved performance in both incompatible and compatible trials, whereas the latter ones were relatively more accelerated. N1 and N2 in EEG indicated that these effects are due to enhanced early perceptual discrimination and attentional allocation.
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Fischer, Jan Lukas Ruben [Verfasser]. "Introducing catechols into sequence-defined macromolecules to control adhesion to organic and inorganic surfaces / Jan Lukas Ruben Fischer." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2021. http://d-nb.info/1229691715/34.
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Tan, Benedict Garcia. "Control of transcription termination by the poly-guanine tracts of conserved sequence block 2 in human mitochondrial DNA." Thesis, University of Bristol, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.752735.
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Lee, Hyung-Woo. "Advanced control for power density maximization of the brushless DC generator." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/1587.
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This dissertation proposes a novel control technique for power density maximization of the brushless DC (BLDC) generator which is a nonsinusoidal power supply system. In a generator of given rating, the weight and size of the system affect the fuel consumption directly, therefore power density is one of the most important issues in a stand-alone generator. Conventional rectification methods cannot achieve the maximum power possible because of a distorted or unsuitable current waveform. The optimal current waveform for maximizing power density and minimizing machine size and weight in a nonsinusoidal power supply system has been proposed theoretically and verified by simulation and experimental work. Also, various attributes of practical interest are analyzed and simulated to investigate the impact on real systems.
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Sachdev, Shrikesh. "Autoregulatory feedback control of c-Rel by IkB[alpha] : loss of IkB[alpha]-mediated control over nuclear import and DNA-binding enables oncogenic activation of c-Rel /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9901276.
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Arango, Nicolas(Nicolas S. ). "Sequence-phase optimal (SPO) [d̳e̳l̳t̳a̳]B₀ field control for lipid suppression and homogeneity for brain magnetic resonance spectroscopic imaging." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/128411.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, February, 2020Cataloged from PDF version of thesis. [d̳e̳l̳t̳a̳] in title on title page appears as upper case Greek letter.
Includes bibliographical references (pages 33-35).
This work develops sequence-phase optimal (SPO) [delta]B₀ shimming methods to reduce lipid contamination and improve brain metabolite spectra in proton spectroscopic imaging. A rapidly reconfigurable 32-channel, local-multi-coil-shim-array is used to enhance lipid suppression and narrow metabolite linewidth in magnetic resonance spectroscopic imaging (MRSI) of the brain. The array is optimally reconfigured dynamically during each MRSI repetition period, first during the lipid-suppression phase, by widening the spectral gap between spatially separate lipid and metabolite regions, and then to narrow metabolite linewidth during readout, by brain-only [delta]B₀ homogenization. This sequence-phase-optimal (SPO) shimming approach is demonstrated on four volunteer subjects using a commercial 3T MRI outfitted with a 32-channel integrated RF receive and local multi-coil shim array. This proposed sequence-phase-optimal shimming significantly improves brain-metabolite MRSI in vivo, as measured by lipid suppression, brain metabolite chemical shift, and line widths. The time required to compute patient specific SPO shims negligibly impacted scan time. Sequence-phase-optimal shimming reduced lipid energy in the brain volume across four subjects by 88%, improved NAA FWHM by 23%, and dramatically reduced lipid ringing artifacts in quantified NAA and Glutamate metabolites, without increasing scan time or SAR.
by Nicolas Arango.
S.M.
S.M. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
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Henninger, John Thomas. "PRODUCTION SEQUENCING AND STABILITY ANALYSIS OF A JUST-IN-TIME SYSTEM WITH SEQUENCE DEPENDENT SETUPS." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_diss/764.
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Just-In-Time (JIT) production systems is a popular area for researchers but real-world issues such as sequence dependent setups are often overlooked. This research investigates an approach for determining stability and an approach for mixed product sequencing in production systems with sequence dependent setups and buffer thresholds which signal replenishment of a given buffer. Production systems in this research operate under JIT pull production principles by producing only when demand exists and idle when no demand exists.
In the first approach, an iterative method is presented to determine stability for a multi-product production system that operates with replenishment signals and may have sequence dependent setups. In this method, a network of nodes representing machine states and arcs representing the buffer inventory levels is used to find a stable trajectory for the production system via an iterative procedure. The method determines suitable buffer levels for the production system that ensure that a trajectory originating from any point within a buffer region will always map to a point contained on another buffer region for all future mappings.
This iterative method for determining the stability of a production system was implemented using an algorithm to calculate the buffer inventory regions for all arcs in a given arc-node network. The algorithm showed favorable results for two and three product systems in which sequence dependent setups may exist.
In the second approach, a product sequencing algorithm determines a product sequence for a production system based on system parameters – setup times, buffer levels, usage rates, production rates, etc. The algorithm selects a product by evaluating the goodness of each product that has reached the replenishment threshold at the current time. The algorithm also incorporates a lookahead function that calculates the goodness for some time interval into the future. The lookahead function considers all branches of the tree of potential sequences to prevent the sequence from travelling down a dead-end branch in which the system will be unable to avoid a depleted buffer. The sequencing algorithm allows the user to weight the five terms of the goodness equations (current and lookahead) to control the behavior of the sequence.
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Meszynska, Anna. "Iterative synthesis of sequence-defined polymers using solid and soluble supports." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAF007/document.
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Dans ce travail, des méthodes itératives ont été étudiées afin de préparer des oligomères à séquences bien définies en utilisant des supports solides ou solubles. Trois stratégies de couplage de monomères ont été exploitées (i) AB + AB, (ii) AB + CD et (iii) AA + BB. La première méthode a permis la synthèse d’oligopeptides en utilisant les protocoles classiques de la synthèse peptidique à partir notamment d’amino-acides protégés par des groupements Fmoc. Les deux autres stratégies ont permis de préparer des oligo(alcoxyamine amide)s et des oligoamides, en l’absence de groupements protecteurs. Dans ces cas, le contrôle de la structure primaire de l’oligomère a été rendu possible soit par l’utilisation de réactions chimio-sélectives (AB + CD) soit en introduisant un large excès de monomères bifonctionnels (AA + BB). Ainsi, les oligo(alkoxyamine amide)s ont été préparés en utilisant des couplages successifs de bromo-anhydride et d’amino-nitroxide ; et les oligoamides ont été obtenus par couplages de diacides et de diamines.L'approche pratique permettant la formation de ces oligomères à séquence contrôlée ainsi que leur caractérisation seront décrites dans cette thèseIn this work, iterative methods have been studied to prepare sequence-defined oligomers on solid and soluble supports. Three model monomer coupling strategies have been exploited, (i) AB + AB, (ii) AB + CD and (iii) AA + BB, for the synthesis of oligopeptides, oligo(alkoxyamine amide)s and oligoamides, respectively. In the first strategy (AB + AB), oligopeptides have been synthesized using classical peptide synthesis protocols, in which Fmoc-protected amino acids were used. The other two strategies (AB + CD and AA + BB) are protecting-group free methods. In this case, the control over the oligomer primary structure has been achieved using chemoselective reactions (AB + CD) or a large excess of bifunctional monomers (AA + BB). The oligo(alkoxyamine amide)s have been prepared using successive coupling of bromo-anhydride and amino-nitroxide building blocks. The oligoamides have been obtained by sequential coupling of diacid and diamine building blocks. The practical approach to these primary structures using solid- and liquid-phase methodologies followed by the characterization of formed oligomers is the scope of this thesis
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Harding, Rachel. "Evolution of the giant southern North Sea shelf-prism : testing sequence stratigraphic concepts and the global sea level curve with full-three dimensional control." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/evolution-of-the-giant-southern-north-sea-shelfprism-testing-sequence-stratigraphic-concepts-and-the-global-sea-level-curve-with-fullthree-dimensional-control(e2837da3-6d8b-4e07-b9a0-0af836e8ee71).html.
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This thesis investigates the utility of sequence stratigraphy on a regional scale and the control of eustacy on basin infill in unprecedented detail. To achieve this, the thesis utilises a wealth of data, including a continuous 3D seismic MegaSurvey dataset covering 55,000 sq. km, combined with state of the art seismic interpretation software to interpret the basin infill of the Late Cenozoic southern North Sea. The prograding shelf-prism clinoforms of the Late Cenozoic are calibrated to high density borehole penetrations, high resolution chronostratigraphy and climate proxies. The chronostratigraphic control enables a correlation of geomorphology, seismic architectures and seismic facies with full 3D control to the global sea level curve, which enables an evaluation of the impact of eustatic change on sequence development. The control of eustacy and the limitations of sequence stratigraphy are highlighted by: 1) Investigating the regional expression of chronostratigraphically calibrated seismic units, which are linked to the global sea level curve. This was carried out by mapping across the region, the dominance of oblique or sigmoidal clinoform types and seismic features such as iceberg scours, terrestrial channels and submarine fans in order to evaluate the lateral variation of depositional systems and accommodation. 2) Investigating sediment partitioning basinwards of the shelf edge and how deposition basinwards can be predicted via observations of seismic facies and architecture. This was achieved by focusing on specific seismic architectures of forced regressive slope clinoforms and deep water sedimentary systems and the link updip to the shelf within the highly constrained chronostratigraphic framework. The thesis results suggest that sequence stratigraphic models do not represent lateral variation well or integrate other allocyclic forcings on sequence development. A holistic and observation based approach to understanding basin infill and recognising the importance of sediment supply, pre-existing geomorphology, process type of the feeder system, differential subsidence, as well as eustacy, is imperative.
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Shuturminska, Kseniya. "Google investigation and use of an elastin-like protein, containing a statherin derived peptide sequence, to control biomimetic fluorapatite formation." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/36229.
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Dental enamel is an excellent example of a highly mineralised tissue, composed of hierarchically organised apatite mineral. This unique organisation gives enamel superior mechanical properties. However, when mature, enamel becomes acellular and unable to repair itself during traumatic or carious damage. The lack of self-repair requires dental intervention, where the common treatment of decayed enamel is to remove the affected and healthy tissue, and replace with restorative materials. The restorative materials, currently used, can cause further complications in the form of secondary caries or failure due to thermal and mechanical property mismatch with enamel. Problems associated with current restorative materials have driven researchers to explore biomimetic enamel treatment routes. To mimic the natural enamel formation, we can explore how proteins can guide mineral growth, in order to form enamel-like ordered mineral structures. In this thesis, the use of a synthetic, recombinant protein called an elastin-like protein (ELP) containing the analogue of the N-terminal of statherin (STNA15) was under investigation. Statherin is a protein present in saliva that is said to aid in the remineralisation of enamel. ELP with STNA15 (STNA15-ELP) has already shown promise in biomimetic mineralisation. This thesis investigated how conformation and structure of STNA15-ELP can be affected and manipulated by different chemical environments, surface constraint and crosslinking. The STNA15-ELP characteristics were related to formation of fluorapatite. STNA15-ELP conformation changed due to presence if salts in solution and whether or not it was constrained. We linked the conformational changes within STNA15-ELP, in solution versus on the surface, to two different routes of mineral formation. FAp formed in an uncontrolled manner with free STNA15-ELP. Ordered FAp formed via a precursor when STNA15-ELP was constrained on a surface. This work leads to an understanding of biomimetic mineralisation using STNA15-ELP. This information can aid in the design of novel biomimetic, enamel-like therapeutics.
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Lee, Min Cherng. "Multiple imputation for missing data and statistical disclosure control for mixed-mode data using a sequence of generalised linear models." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/366481/.
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Multiple imputation is a commonly used approach to deal with missing data and to protect confidentiality of public use data sets. The basic idea is to replace the missing values or sensitive values with multiple imputation, and we then release the multiply imputed data sets to the public. Users can analyze the multiply imputed data sets and obtain valid inferences by using simple combining rules, which take the uncertainty due to the presence of missing values and synthetic values into account. It is crucial that imputations are drawn from the posterior predictive distribution to preserve relationships present in the data and allow valid conclusions to be made from any analysis. In data sets with different types of variables, e.g. some categorical and some continuous variables, multivariate imputation by chained equations (MICE) (Van Buuren (2011)) is a commonly used multiple imputation method. However, imputations from such an approach are not necessarily drawn from a proper posterior predictive distribution. We propose a method, called factored regression model (FRM) to multiply impute missing values in such data sets by modelling the joint distribution of the variables in the data through a sequence of generalised linear models. We use data augmentation methods to connect the categorical and continuous variables and this allows us to draw imputations from a proper posterior distribution. We compare the performance of our method with MICE using simulation studies and on a breastfeeding data. We also extend our modelling strategies to incorporate different informative priors for the FRM to explore robust regression modelling and the sparse relationships between the predictors. We then apply our model to protect confidentiality of the current population survey (CPS) data by generating multiply imputed, partially synthetic data sets. These data sets comprise a mix of original data and the synthetic data where values chosen for synthesis are based on an approach that considers unique and sensitive units in the survey. Valid inference can then be made using the combining rules described by Reiter (2003). An extension to the modelling strategy is also introduced to deal with the presence of spikes at zero in some of the continuous variables in the CPS data.
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Mwinyi, Adina, Achim Meyer, Christoph Bleidorn, Bernhard Lieb, Thomas Bartolomaeus, and Lars Podsiadlowski. "Mitochondrial genome sequence and gene order of Sipunculus nudus give additional support for an inclusion of Sipuncula into Annelida." Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2010/4491/.
Full textAbstract:
Background:
Mitochondrial genomes are a valuable source of data for analysing phylogenetic
relationships. Besides sequence information, mitochondrial gene order may add phylogenetically useful information, too. Sipuncula are unsegmented marine worms, traditionally placed in their own phylum. Recent molecular and morphological findings suggest a close affinity to the segmented Annelida.
Results:
The first complete mitochondrial genome of a member of Sipuncula, Sipunculus nudus, is presented. All 37 genes characteristic for metazoan mtDNA were detected and are encoded on the same strand. The mitochondrial gene order (protein-coding and ribosomal RNA genes) resembles that of annelids, but shows several derivations so far found only in Sipuncula. Sequence based phylogenetic analysis of mitochondrial protein-coding genes results in significant bootstrap
support for Annelida sensu lato, combining Annelida together with Sipuncula, Echiura, Pogonophora and Myzostomida.
Conclusion:
The mitochondrial sequence data support a close relationship of Annelida and
Sipuncula. Also the most parsimonious explanation of changes in gene order favours a derivation from the annelid gene order. These results complement findings from recent phylogenetic analyses of nuclear encoded genes as well as a report of a segmental neural patterning in Sipuncula.
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Llobet, Martí Bernat. "Analysis of the interactivity in a teaching and learning sequence with novice rugby players: the transfer of learning responsibility and control." Doctoral thesis, Universitat de Girona, 2016. http://hdl.handle.net/10803/399791.
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This thesis is a compilation of 3 articles, and the main focus of attention is the learning transfer mechanism. The first article explains the Rugby Attack Assessment instrument, a tool that assesses game performance of rugby union during a 5v5 small-sided game, taking into account simple actions and more complex tactical behaviours. The second paper explores the use of the Integrated Technique-Tactical Model used during the teaching and learning sequence, and reports the learning outcomes of this sequence. Results at a macro-level show no significant improvements. Results at a micro-level show an increase of some tactical behaviours frequencies. The third article analyses the interactivity among participants and the transfer of learning responsibility from the coach to the players. The units of analysis are the segments of interactivity. Results show that this process is linked to a slight decrease of segmentation, and mainly to the transfer of reflection from specific segments of discussion to reflections done during the guided practiceAquesta tesi és una compilació de 3 articles, i l'objectiu principal és eñ mecanisme de traspàs de l'aprenentatge. El primer article explica el Rugby Attack Assessment Instrument, una eina que avalua el rendiment col·lectiuen el rugbi en una situació reduïda de 5x5, tenint en compte accions simples i comportaments tàctics més complexos. El segon article explica l'ús del Model Integrat Tècnic-Tàctic utilitzat durant la seqüència d'ensenyament i aprenentatge, i explica els resultats de l'aprenentatge d'aquesta seqüència. Els resultats en un nivell macro revelen que no hi ha millores significatives. Els resultats a nivell micro mostren un increment de la freqüència de determinats comportaments tàctics. El tercer article analitza la interactivitat entre els participants i el traspàs de la responsabilitat de l'aprenentatge de l'entrenador als jugadors. Les unitats d'anàlisi són els segments d'interactivitat. Els resultats mostren que aquest procés està lligat a un lleuger descens de la segmentació i principalment a un traspàs dels moments de reflexió des de segments específics de discussió cap a reflexions dutes a terme durant la pràctica guiada
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Křivánek, Filip. "Návrh logiky řízení tvorby sekvence karoserií v oblasti vrchního laku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231937.
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This thesis describes the finish-painting area at ŠKODA AUTO a.s. company in Mladá Boleslav. The logistic operations and transporter technology in this production hall are described here. Furthermore this thesis is concerned to sequence making of car body before the finish-painting area. The output evaluation is make of experiments and comparison of influence of an old logic of choosing a colored block with a new control logic for car body with influence on the correct shifting of car body according to a sequence number. The containers for car body including all other workplaces of the painting area are created in the Plant Simulation program.
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Ye, Zhihong. "Modeling and Control of Parallel Three-Phase PWM Converters." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/29476.
Full textAbstract:
This dissertation studies modeling and control issues of parallel three-phase pulse-width modulated (PWM) converters. The converters include three-phase boost rectifiers, voltage source inverters, buck rectifiers and current source inverters.
The averaging of the parallel converters is performed based on a generic functional switching unit, which is called a phase leg in boost rectifiers and voltage source inverters, and a rail arm in buck rectifiers and current source inverters. Based on phase-leg and rail-arm averaging, the developed models are not only equivalent to the conventional three-phase converter models that are based on phase-to-phase averaging, but they also preserve common-mode information, which is critical in the analysis of the parallel converters. The models reveal such parallel dynamics as reactive power circulation and small-signal interaction.
A unique feature of the parallel three-phase converters is a zero-sequence circulating current. This work proposes a novel zero-sequence control concept that uses variable zero-vectors in the space-vector modulation (SVM) of the converters. The control can be implemented within an individual converter and is independent from the other control loops for the converter. Therefore, it greatly facilitates the design and expansion of a parallel system.
Proper operation of the parallel converters requires an explicit load-sharing mechanism. In order to have a modular design, a droop method is recommended. Traditionally, however, a droop method has to compromise between voltage regulation and load sharing. After parametric analysis, a novel droop method using a gain-scheduling technique is proposed. The numeric analysis shows that the proposed droop method can achieve both good voltage regulation and good load sharing.
An interleaving technique is often used in parallel converter systems in order to reduce current ripples. Because of its symmetrical circuit structure, the parallel three-phase converter system can reduce both differential-mode and common-mode noise with a center-aligned symmetrical SVM.
Based on the concept that a symmetrical circuit can reduce common-mode dv/dt noise, a conventional three-phase, four-leg inverter is modified so that its fourth leg is symmetrical to the other three legs. The common-mode dv/dt noise can be practically eliminated with a new modulation strategy. Meanwhile, with a modified control design, the new four-leg inverter still can handle low-frequency common-mode components that occur due to unbalanced and nonlinear load.Ph. D.
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Kapidou, Alexandra. "Application for Wind Farm Integration Complying with the Grid Code by Designing an Outer Control Strategy for the Converter." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187686.
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The continuously increasing energy penetration from wind farms into the grid raises concerns regarding power quality and the stable operation of the power system. The Grid Code´s requirements give strict guidelines for a wind farm´s behaviour under faulty or abnormal operating conditions.The primary purpose of this project is the application of a STATCOM for wind farm integration complying with the Grid Code. Towards that, an outer control strategy for the converter is designed so as to regulate the voltage at the point of common coupling by providing reactive power compensation. Thus the safe operation of the grid will be ensured since the wind farm will follow the Grid Code´s standards.The existing Grid Code requires only a positive sequence current controller. This study attempts to investigate whether this is sufficient or not and to examine the possibility of extending the Grid Code requirements so as to incorporate a negative sequence current controller as well. The results support the latter suggestion. Also, the use of SiC devices was also considered in this project.Den ständigt ökande penetrationen av vindenergi i elnätet väcker farhågor om elkvalitet och stabil drift av kraftsystemet. Nätkoden (Grid Code) ger strikta riktlinjer för en vindkraftsparks beteende i felfall och under onormala driftsförhållanden.Huvudsyftet med detta projekt är att använda en STATCOM för integration av vindkraftsparker så att nätkoden uppfylls. I detta projekt utformas en yttre reglerstrategi för omriktaren för att reglera spänningen vid anslutningspunkten för vindkraftsparken genom att tillhandahålla reaktiv effektkompensering. Därigenom uppnås en säker drift av nätet eftersom vindkraftparken kommer att följa nätkoden.Den befintliga nätkoden kräver endast styrning av plusföljdskomponenten av strömmen. Denna studie försöker undersöka om detta är tillräckligt samt undersöka möjligheten för att utvidga nätkoden genom att införa ett krav på styrning av negativ-sekvens ström. Resultaten stöder det sistnämnda förslaget. Även användningen av halvledarkomponenter av kiselkarbid-SiC studerades i detta projekt.
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Grymel, Martin-Thomas. "Error control with binary cyclic codes." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/error-control-with-binary-cyclic-codes(a5750b4a-e4d6-49a8-915b-3e015387ad36).html.
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Error-control codes provide a mechanism to increase the reliability of digital data being processed, transmitted, or stored under noisy conditions. Cyclic codes constitute an important class of error-control code, offering powerful error detection and correction capabilities. They can easily be generated and verified in hardware, which makes them particularly well suited to the practical use as error detecting codes.A cyclic code is based on a generator polynomial which determines its properties including the specific error detection strength. The optimal choice of polynomial depends on many factors that may be influenced by the underlying application. It is therefore advantageous to employ programmable cyclic code hardware that allows a flexible choice of polynomial to be applied to different requirements. A novel method is presented in this thesis to realise programmable cyclic code circuits that are fast, energy-efficient and minimise implementation resources.It can be shown that the correction of a single-bit error on the basis of a cyclic code is equivalent to the solution of an instance of the discrete logarithm problem. A new approach is proposed for computing discrete logarithms; this leads to a generic deterministic algorithm for analysed group orders that equal Mersenne numbers with an exponent of a power of two. The algorithm exhibits a worst-case runtime in the order of the square root of the group order and constant space requirements.This thesis establishes new relationships for finite fields that are represented as the polynomial ring over the binary field modulo a primitive polynomial. With a subset of these properties, a novel approach is developed for the solution of the discrete logarithm in the multiplicative groups of these fields. This leads to a deterministic algorithm for small group orders that has linear space and linearithmic time requirements in the degree of defining polynomial, enabling an efficient correction of single-bit errors based on the corresponding cyclic codes.
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Máčala, Stanislav. "Ověření dosažení požadované sekvence výrobků při průchodu oblastí lakovny pomocí simulačního modelu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231218.
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Goal of this diploma thesis is to create discrete simulation model of a buffer for sorting cars by their color in order to create bigger color blocks in front of upper paint area in paintshop of ŠKODA AUTO a.s. in Mladá Boleslav. Simulation model is created in Plant Simulation software produced by Siemens PLM Software company. Section of this diploma thesis is paid to system analysis of conveyors used in solved area and to suggestion of planned modifications. It is tested by simulation model whether the planned modifications would have positive effect on production characteristic in concern area. Conclusions are deduced from mentioned experiments.
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Ibrahim, Abdulkareem B. "Error resilience and concealment in MVC video over wireless networks." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/10484.
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Multi-view video is capable of presenting a full and accurate depth perception of a scene. The concept of multi-view video is becoming more useful especially in 3D display systems by enhancing the viewing of high resolution stereoscopic images from arbitrary viewpoints without the use of any special glasses. Like monoscopic video, the multi-view video is faced with different challenges such as: reliable compression, storage and bandwidth due to the increased number of views as well as the high sensitivity to transmission errors. All these may lead to a detrimental effect on the reconstructed views. The work in this thesis investigates the problems and challenges of transmission losses in a multi-view video bitstream over error prone wireless networks. Based on the network simulation results, the proposed technique is capable of addressing the problem of transmission losses. In practical wireless networks, transmission errors are inevitable and pose a serious challenge to the coded video data. The aim of this research effort is to examine the effect of these errors in a multi-view video bitstream when transmitted over a lossy channel. Moreover, this research work aims to develop a novel scheme that can make the multi-view coded videos more robust to transmission errors by minimizing the error effects and improving the perceptual quality. Multi-layer data partitioning as an error resilient technique is developed in JMVC 8.5 reference software in order to make the multi-view video bitstream more robust during transmission. In addition to that, we propose a simple decoding scheme that can support the decoding of the multi-layer data partitioning bitstream over channels with high error rate. The proposed technique is benchmarked with the already existing H.264/AVC data partitioning technique. The work in this thesis also employs the use of group of pictures as a coding parameter to investigate and reduce the effects of transmission errors in multi-view video transmitted over a very high error rate channel. The experiments are carried out with different error loss rates in order to evaluate the performance of these techniques in terms of perceptual quality when transmitted over a simulated erroneous channel. Errors are introduced using the Sirannon network simulator. The error performance of each technique is evaluated and analysed both objectively and subjectively after reconstruction. The results of the research investigation and simulation are presented and analysed in chapter six of the thesis.
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Kunst, Rafael. "Um injetor de erros aplicado à avaliação de desempenho do codificador de canal em redes IEEE 802.16." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17800.
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A necessidade de suportar serviços multimídia impulsiona o desenvolvimento das redes sem fio. Com isso, torna-se importante fornecer confiabilidade na transmissão de dados em um ambiente sujeito a variações espaciais, temporais e de freqüência, causadas por fenômenos físicos que, geralmente, causam erros nos dados transmitidos. Esses erros são basicamente de dois tipos: erros em rajada e erros aleatórios (Additive White Gaussian Noise - AWGN). Simular o comportamento dos canais sem fio afetados por erros é objeto de pesquisa há diversos anos. Entretanto, grande parte das pesquisas não considera a aplicação dos dois tipos de erros simultaneamente, o que pode gerar imprecisões nos resultados das simulações. Sendo assim, este trabalho propõe um injetor capaz de gerar tanto seqüências de erros em rajada quanto AWGN, além de propor um modelo de erros híbrido que considera a injeção de ambos os tipos de erros para simular o comportamento de um canal sem fio. O injetor de erros proposto é empregado em um estudo de caso referente à análise de desempenho do mecanismo de codificação de canal em redes que seguem o padrão IEEE 802.16, tanto nomádicas (fixas) quanto móveis. É avaliada a capacidade de correção dos codificadores Forward Error Correction (FEC), de emprego obrigatório de acordo com o referido padrão. Além disso, estuda-se o impacto causado pela aplicação de técnicas que consistem na adição de diversidade temporal à transmissão, em cenários cuja ocorrência dos erros é em rajada, e em cenários cujos erros são modelados de acordo com seqüências AWGN. Finalmente, realiza-se um estudo teórico sobre a vazão que pode ser atingida nos cenários nomádicos e móveis, além de uma discussão sobre os avanços tecnológicos trazidos pela multiplexação de canal baseada em Orthogonal Frequency Division Multiple Access (OFDMA), empregado em redes IEEE 802.16 móveis.The demand for providing multimedia services is increasing the development of wireless networks. Therefore, an important issue is to guarantee correct transmissions over channels that are affected by time and frequency variant conditions caused by physical impairments that lead to the occurrence of errors during the transmission. These errors are basically of two types: burst errors and random errors, typically modeled as Additive White Gaussian Noise (AWGN). Simulating the behavior of wireless channels affected by physical impairments has been subject of several investigations in the past years. Nevertheless, part of the current researches does not consider the occurrence of both errors at the same time. This approach may lead to imprecisions on the results obtained through simulations. This work proposea an error sequence generator which is able of generating both burst and AWGN error models. Moreover, the proposed model can generate hybrid errors sequences composed of both error types simultaneously. The proposed error sequence generator is applied to a case study that aims to evaluate the performance of the channel encoder of nomadic (fixed) and mobile IEEE 802.16 networks. In this context, we evaluate the error correction capability of FEC encoders which are mandatory according to IEEE 802.16 standard. Furthermore, we study the impact caused by the application of time diversity techniques on the transmission, considering scenarios affected by burst errors and AWGN. We also present a study about the theoretical throughput that can be reached by nomadic and mobile technologies. Finally, we discuss the technological advances brought by Orthogonal Frequency Division Multiple Access (OFDMA) channel multiplexing technique, which is employed in IEEE 802.16 mobile networks.
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Pauly, Marc. "Etude structurale et fonctionnelle de la sequence tata du promoteur precoce du virus simien sv40." Université Louis Pasteur (Strasbourg) (1971-2008), 1989. http://www.theses.fr/1989STR13043.
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Dans le but d'elucider les mecanismes moleculaires de la regulation de l'expression des genes, une etude structurale et fonctionnelle detaillee de la sequence tata du promoteur precoce du virus sv40 est realisee. La mutagenese dirigee utilisant des oligodesoxynucleotides de synthese permet la localisation des domaines fonctionnels de deux elements tata situes dans la region d'origine de replication virale. Chacun des elements dirige independamment l'initiation precise et efficace de la transcription precoce in vivo a partir d'un groupe de sites definis
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Steube, Marvin [Verfasser], Holger [Akademischer Betreuer] Frey, Axel H. E. [Akademischer Betreuer] Müller, and George [Akademischer Betreuer] Floudas. "Sequence-Control in Styrene/Isoprene Tapered Multiblock Copolymers : From Fundamental Kinetics to Morphologies and Mechanics of Thermoplastic Elastomers / Marvin Steube ; Holger Frey, Axel H.E. Müller, George Floudas." Mainz : Universitätsbibliothek der Johannes Gutenberg-Universität Mainz, 2020. http://d-nb.info/1227118945/34.
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Pardo, Jérémie. "Méthodes d'inférence de cibles thérapeutiques et de séquences de traitement." Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG011.
Full textAbstract:
Un enjeu majeur de la médecine des réseaux est l’identification des perturbations moléculaires induites par les maladies complexes et les thérapies afin de réaliser une reprogrammation cellulaire. L’action de la reprogrammation est le résultat de l’application d’un contrôle. Dans cette thèse, nous étendons le contrôle unique des réseaux biologiques en étudiant le contrôle séquentiel des réseaux booléens. Nous présentons un nouveau cadre théorique pour l’étude formelle des séquences de contrôle. Nous considérons le contrôle par gel de noeuds. Ainsi, une variable du réseau booléen peut être fixée à la valeur 0, 1 ou décontrôlée. Nous définissons un modèle de dynamique contrôlée pour le mode de mise à jour synchrone où la modification de contrôle ne se produit que sur un état stable. Nous appelons CoFaSe le problème d’inférence consistant à trouver une séquence de contrôle modifiant la dynamique pour évoluer vers une propriété ou un état souhaité. Les réseaux auxquels sera appliqué CoFaSe auront toujours un ensemble de variables incontrôlables. Nous montrons que ce problème est PSPACE-dur. L’étude des caractéristiques dynamiques du problème CoFaSe nous a permis de constater que les propriétés dynamiques qui impliquent la nécessité d’une séquence de contrôle émergent des fonctions de mise à jour des variables incontrôlables. Nous trouvons que la longueur d’une séquence de contrôle minimale ne peut pas être supérieure à deux fois le nombre de profils des variables incontrôlables. À partir de ce résultat, nous avons construit deux algorithmes inférant des séquences de contrôle minimales sous la dynamique synchrone. Enfin, l’étude des interdépendances entre le contrôle séquentiel et la topologie du graphe d’interaction du réseau booléen nous a permis de découvrir des relations existantes entre structure et contrôle. Celles-ci mettent en évidence une borne maximale plus resserrée pour certaines topologies que celles obtenues par l’étude de la dynamique. L’étude sur la topologie met en lumière l’importance de la présence de cycles non-négatifs dans le graphe d’interaction pour l’émergence de séquences minimales de contrôle de taille supérieure ou égale à deuxNetwork controllability is a major challenge in network medicine. It consists in finding a way to rewire molecular networks to reprogram the cell fate. The reprogramming action is typically represented as the action of a control. In this thesis, we extended the single control action method by investigating the sequential control of Boolean networks. We present a theoretical framework for the formal study of control sequences.We consider freeze controls, under which the variables can only be frozen to 0, 1 or unfrozen. We define a model of controlled dynamics where the modification of the control only occurs at a stable state in the synchronous update mode. We refer to the inference problem of finding a control sequence modifying the dynamics to evolve towards a desired state or property as CoFaSe. Under this problem, a set of variables are uncontrollable. We prove that this problem is PSPACE-hard. We know from the complexity of CoFaSe that finding a minimal sequence of control by exhaustively exploring all possible control sequences is not practically tractable. By studying the dynamical properties of the CoFaSe problem, we found that the dynamical properties that imply the necessity of a sequence of control emerge from the update functions of uncontrollable variables. We found that the length of a minimal control sequence cannot be larger than twice the number of profiles of uncontrollable variables. From this result, we built two algorithms inferring minimal control sequences under synchronous dynamics. Finally, the study of the interdependencies between sequential control and the topology of the interaction graph of the Boolean network allowed us to investigate the causal relationships that exist between structure and control. Furthermore, accounting for the topological properties of the network gives additional tools for tightening the upper bounds on sequence length. This work sheds light on the key importance of non-negative cycles in the interaction graph for the emergence of minimal sequences of control of size greater than or equal to two
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Zhang, Yu. "Small-Signal Modeling and Analysis of Parallel-Connected Power Converter Systems for Distributed Energy Resources." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_dissertations/551.
Full textAbstract:
Alternative energy resources (such as photovoltaics, fuel cells, wind turbines, micro-turbines, and internal combustion engines) and energy storage systems (such as batteries, supercapacitors, and flywheels) are increasingly being connected to the utility grid, creating distributed energy resources which require the implementation of an effective distributed power management strategy. Parallel-connected power converters form a critical component in such a distributed energy resources system. This dissertation addresses small-signal modeling and analysis of parallel-connected power converter systems operating in distributed energy environments. This work focuses on DC-DC and DC-AC power converters. First, this work addresses the small-signal modeling and analysis of parallel-connected power converters in a battery/supercapacitor hybrid energy storage system. The small-signal model considers variations in the current of individual energy storage devices and the DC bus voltage as state variables, variations in the power converter duty cycles as control variables, and variations in the battery and the supercapacitor voltages and the load current as external disturbances. This dissertation proposes several different control strategies and studies the effects of variations in controller and filter parameters on system performance. Simulation studies were carried out using the Virtual Test Bed (VTB) platform under various load conditions to verify the proposed control strategies and their effect on the final states of the energy storage devices. Control strategies for single DC-AC three-phase power converters are also identified and investigated. These include a novel PV (active power and voltage) control with frequency droop control loop, PQ (active power and reactive power) control, voltage control, PQ control with frequency droop control, and PQ control with voltage and frequency droop control. Small-signal models of a three-phase power converter system with these control strategies were developed, and the impact of parameter variations on the stability of a PV controlled converter were studied. Moreover, a small-signal model of parallel-connected three-phase DC-AC power converters with individual DC power supplies and network is proposed. The simulations carried out in stand-alone and grid-connected modes verify the combined control strategies that were developed. In addition, a detailed small-signal mathematical model that can represent the zero-sequence current dynamics in parallel-connected three-phase DC-AC power converters that share a single DC power source is presented. The effects of a variety of factors on the zero-sequence current are investigated, and a control strategy to minimize the zero-sequence current is proposed. Time-domain simulation studies verify the results. Simulations of a parallel-connected DC-AC power converter system with nonlinear load were carried out. The active power filter implemented in this system provides sharing of harmonic load between each power converter, and reduces harmonic distortion at the nonlinear load by harmonic compensation.