Tesis sobre el tema "Control strategie"
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MINELLI, MARCO. "Strategie di Controllo Avanzate per la Robotica Chirurgica". Doctoral thesis, Università degli studi di Modena e Reggio Emilia, 2022. http://hdl.handle.net/11380/1277913.
Texto completoSurgical robotics can be considered an established reality in the medical field. The most striking example is the release of the da Vinci® surgical system by Intuitive Surgical almost 20 years ago. It is estimated that more than 200 000 surgeries were carried out with the da Vinci® in 2012 only, most of which were for hysterectomies and prostate removals. Most robotized surgical operations are performed using teleoperation techniques, where the surgeon sits on a remote console and has complete control of the movements of the robot, without the possibility for the robot to make decisions or perform tasks autonomously. The latter is one of the main topics on which researches in surgical robotics are focused nowadays. Indeed, autonomy can give important advantages, which include increased efficiency and repeatability due to precise robot control, improved execution quality thanks to real-time biosignal feedback and computer-aided guidance, and fewer costs. The important developments that have characterized the last decades in terms of artificial intelligence have pushed even further in this direction. However, it is necessary to take into account that making a robotic surgical system autonomous opens up new important challenges in terms of control. The system must be able, for example, to perceive the surrounding environment to cooperate with other systems while avoiding collisions, understand the environment dynamics to interact with it and to compensate external disturbances, and comply with all the constraints necessary to perform the surgical procedure correctly. Another important problem when making a system autonomous is the collection of data necessary for the training of the system, which are often few and difficult to acquire. The work of this thesis starts to address some of these challenging problems arising during the development of the European-funded project Smart Autonomous Robotic Assistant Surgeon. First, a standard laparoscopic procedure was fully robotized with a teleoperation architecture providing stable force feedback and visual feedback capabilities have been proposed for multi arms systems. This architecture was specifically developed for data collection and was used for artificial intelligence training. Moreover, the results obtained have been extended for building a trilateral teleoperation architecture for training purposes. In the following, the work concentrated on developing the planning and coordination system for the control of multiple robotic instruments. The proposed system aims to deal with the uncertainty provided by the cognitive module and to generate a safe collision-free autonomous motion. Thanks to the experience acquired during the development of the previous strategies, a robotic assistance architecture for the renal access procedure during Percutaneous nephrolithotomy has been developed. The last problem addressed in the thesis is the control of the remote center of motion for robotic systems without mechanical remote center of motion. The proposed architecture considers the effects this constraint causes on the dynamics of the system and proposes a controller that aims to deal with the constraint maximizing flexibility and performance. This controller is also proposed within a teleoperation setup. All the proposed systems have been experimentally validated on physical setups, with the aim of verifying and confirming the applicability and the effectiveness of each of them.
MENGARELLI, ALESSANDRO. "Balance and Motor Control in Dynamic Tasks". Doctoral thesis, Università Politecnica delle Marche, 2017. http://hdl.handle.net/11566/245482.
Texto completoIn the first part of this work a characterization of the upright stance recovery after balance perturbation administered through external stimuli was performed. Balance response has been analyzed in dynamics, kinematics and electromyographic terms, in order to obtain a complete description of which mechanisms are employed to withstand sudden stance perturbations. A series of parameters have been extracted from center of pressure and center of mass displacement and from electromyographic signals, acquired from lower limb and trunk muscles, in order to obtain a series of indexes which can correlate with the different characteristic of perturbations. From kinematic data, a description of the postural strategies adopted to withstand perturbations has been performed, in order to observe whether different perturbation conditions evoke different responses, employing different articular joints. Eventually, a first attempt to model perturbed upright stance through a double-link inverted pendulum is proposed, applying control systems seldom employed in describing this kind of dynamic motor task. In the second part, the motor control during the walking task was described in terms of muscular activity. Myoelectric signals were acquired in hundreds of consecutive strides, obtaining a new type of description, not only in terms of temporal parameters of muscles activity but also in terms of the occurrence frequency of each muscular activation modality during gait. The main outcomes include the description of co-contraction activity between ankle flexor muscles and the assessment of the recurrence of each co-activation pattern during walking. Furthermore, a description of the whole lower limb muscles behavior was performed, aimed to the quantification of gender-based differences in muscular recruitment during gait. Then, these two aspects were joined in assessing gender-related differences in co-contraction activity of muscles which control the ankle joint mechanics during walking.
CARFAGNA, EMILIO. "Indagine su nuove strategie di controllo per azionamenti elettrici ad alta velocità". Doctoral thesis, Università degli studi di Modena e Reggio Emilia, 2022. http://hdl.handle.net/11380/1277906.
Texto completoThe aim of this thesis was to investigate new control techniques for electric motors designed to work at high speed. This type of motor is characterized by high electrical frequencies and can be divided into: very high speed motors and motors with a high number of pole pairs. In the first case, the very high speed motor, is used, for example, for pumping and ventilation applications, while in the second case, the motor with a high number of pole pairs, for example the hybrid stepper (the motor usually has 50 teeth rotor blades), is used for positioning control. In the field of electric drives, standard control is based on a proportional regulator-integral on the current and speed loops, but when the motor is used at high speed the linear control becomes unstable in the presence of low switching frequency ratios fsw with respect to the electric frequency fel. A study on different control strategies to increase the bandwidth of the current loops was carried out for the hybrid stepper motors starting from the simulations in Plecs environment and concluding with the experimental tests carried out on an industrial setup. To increase the tolerance of the entire control system, the position sensor has been removed, for its sensitivity to noise, possible failures and higher costs. The work, for hybrid stepper motors, involved the development of sensorless control strategies for hybrid stepper motors by first closing the vector control with respect to the speed loop, and subsequently closing the position loop with an hybrid strategy comprising vector control (for medium and high speeds) and microstepping control (for low speeds and at standstill) to solve the observability problems electrical machines at low speeds. New sensorless control strategies are also presented for internal permanent magnet motors for low speed working region using low frequency signal injection to reduce acoustic noise respect to the classical high frequency one, and for the medium/high speed working region extending the use of stator flux observers commonly adopted for surface mounted permanent magnet motors. In addition to evaluations from a control point of view, a valid alternative for high-speed motors is the single stage Current Source Inverter (CSI). The CSI, compared to the more popular Voltage Source Inverters (VSI), intrinsically works as a boost allowing to work at high speed even with limited supply voltages, a very interesting aspect in aerospace and electric mobility applications. The activity on the converter involved the synthesis of a new control strategy to eliminate the converter prestage, the sensorless control using directly the voltage measurements and the extension of the speeds that can be reached considering the working region in low speed. Another aspect to consider, in the control of high speed machines, is the problem of iron losses in the ferromagnetic material which cause greater amplitudes of the currents, lower efficiency and decrease the output torque. The activity involved the synthesis of a new control strategy based on predictive control and the subsequent implementation in dSpace.
Vychopeň, David. "Stanovení parametrů matematického modelu řídicí jednotky spalovacího motoru". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231768.
Texto completoMatyáš, Ondřej. "Manažerské řídící systémy jako nástroj implementace strategie firmy". Doctoral thesis, Vysoká škola ekonomická v Praze, 2003. http://www.nusl.cz/ntk/nusl-77147.
Texto completoZázvorka, Tomáš. "Strategické řízení". Master's thesis, Vysoká škola ekonomická v Praze, 2012. http://www.nusl.cz/ntk/nusl-150214.
Texto completoVoborná, Petra. "Studie tvorby výrobní strategie". Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2008. http://www.nusl.cz/ntk/nusl-221764.
Texto completoViková, Miroslava. "Návrhy strategie řízení podpory prodeje firmy". Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2007. http://www.nusl.cz/ntk/nusl-221550.
Texto completoBADALAMENTI, Emilio. "Le specie alloctone invasive in Sicilia: caratterizzazione del fenomeno, strategie di colonizzazione e possibili strategie di contrasto". Doctoral thesis, Università degli Studi di Palermo, 2014. http://hdl.handle.net/10447/91190.
Texto completoMohamad, Mohamad Kheir. "Control System of Building using Modelling and Simulation". Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-234236.
Texto completoCharopkin, Aliaksandr. "Analýza a návrh marketingové komunikační strategie společnosti Phillip Morris na českém trhu". Master's thesis, Vysoká škola ekonomická v Praze, 2010. http://www.nusl.cz/ntk/nusl-82043.
Texto completoFESCE, ELISA. "MATHEMATICAL MODELLING TO INVESTIGATE INFECTIOUS DISEASE DYNAMICS AND CONTROL STRATEGIES". Doctoral thesis, Università degli Studi di Milano, 2022. http://hdl.handle.net/2434/894476.
Texto completoAguilera, Rayas Adolfo. "La competitivite des pmi : une demarche et des outils". Paris, ENSAM, 1987. http://www.theses.fr/1987ENAM0001.
Texto completoCangini, Marco. "Definizione delle strategie di attuazione per iniezione e accensione in un sistema di rapid control prototyping realizzato su piattaforma National Instruments". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3774/.
Texto completoKos, Václav. "Návrh opatření pro rozvoj managementu firmy". Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2009. http://www.nusl.cz/ntk/nusl-222155.
Texto completoPokorný, Pavel. "Construction of the Optimal Control Strategy for an Electric-Powered Train". Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233935.
Texto completoAxengren, Josefine y Sandra Petersson. "Att lyckas med strategisk planering och strategisk kontroll – En fallstudie på två svenska företag". Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10443.
Texto completoA competitive strategy is essential for a corporate’s success in their industry. The challenge is not only to design the strategy; it is to spread it throughout the organization. An integrated measurement system refers to support and control the activities and goals that leads to strategic success. Thus, earlier studies have shown that integrated measurement systems have contributed to improve large enterprises’ performances when applied in their businesses. However, this study refers to the gap of research on the use of integrated measurement systems and its impact on small and medium-sized enterprises (SME). This study focusses on two Swedish SMEs and research what characterize their qualities that contributes to strategic success. The study will also focus on how the SMEs apply strategic planning and strategic control in their business’s.The study was based on previous studies in the context of strategy. The interviews were conducted on two Swedish SMEs, and the respondents were people that are a part of each company’s management team that possess both knowledge and insight to the company’s strategic work.Our findings suggest that factors contributing to strategic success in SME’s are: the communication approach, the attitude of the employees and the organizational structure. The strategic planning in SME wasn’t based on a specific model to support the strategic planning. However, they use a similar methodical approach to implement the activities in the strategic planning process. Finally, the study also shows that SMEs use integrated measurement in terms of financial and non-financial measurements, where the financial measurements had a greater impact on the SME business’s.
Agbi, Clarence. "Scalable and Robust Designs of Model - Based Control Strategies for Energy - Efficient Buildings". Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/333.
Texto completoPikman, Oxana. "Komparace vývoje ekonomického chování v Rusku, v Kazachstánu a na Ukrajině". Master's thesis, Vysoká škola ekonomická v Praze, 2012. http://www.nusl.cz/ntk/nusl-162788.
Texto completoAxelsson, Johanna y Sarah Bernelind. "Elevator Control Strategies". Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-134900.
Texto completoSyftet med denna rapport ar att undersoka om det ar eektivt att byta strategi for hissar i en kontorsbyggnad under en dags olika trakoden. Forst beskrivs nagra av de vanligaste strategierna, vilket foljs av en jamforelse och analys av tva av dessa. For att kunna jamfora dessa strategier har en implementation av ett program som simulerar en byggnad med hissar gjorts. I programmet anvands sedan dessa strategier for att ta fram testresultat. Den mest eektiva av dessa tva strategier har optimerats och jamforts ytterligare med de tidigare resultaten. Testresultaten visar att den optimerade strategin var den mest eektiva med avseende pa genomsnittsvantetiden och den totala genomsnittsrestiden, och att det inte ar nodvandigt att helt byta strategi under dagen, men att det lonar sig att optimera delar av den, beroende pa trakodet
Ceder, Frederick y Alexandra Nordin. "Elevator Control Strategies". Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-134902.
Texto completoJohnson, Mackie. "Retail Inventory Control Strategies". ScholarWorks, 2016. https://scholarworks.waldenu.edu/dissertations/3171.
Texto completoDušek, Jiří. "Řízení stroje s PM v d-q osách při použití Matlab/Simulink". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218789.
Texto completoAlimohammadi, Reza. "Portfolio strategic control and portfolio management performance". Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/102162/4/Reza_Alimohammadi_Thesis.pdf.
Texto completoChow, Andy Ho Fai. "Adaptive traffic control system : a study of strategies, computational speed and effect of prediction error /". View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202002%20CHOW.
Texto completoIncludes bibliographical references (leaves 126-129). Also available in electronic version. Access restricted to campus users.
Kahriman, Edin y Srdjan Jovanovic. "Alternative Strategies for Engine Control". Thesis, Linköpings universitet, Reglerteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119470.
Texto completoDet existerande styrsystemet i Volvo CE:s maskiner har till uppgift att styra och reglera flera olika fysikaliska storheter. En av dessa storheter är motorvarvtalet. Syftet med detta examensarbete är att undersöka alternativa reglerstrategier som kan användas för att styra motorvarvtalet. Problemet idag är att det nuvarande styrsystemet kräver omkalibrering av regulatorparametrar när befintlig hårdvara i maskinen behöver ersättas på grund av föråldring eller slitage. Den nuvarande regulatorn är en parameterstyrd PID-regulator där regulatorparametrarna beror av aktuell arbetspunkt. Målet har varit att utveckla och prova flera olika adaptiva reglerstrategier. Dessa metoder förväntas kunna hantera förändringar och adaptera sig mot nya förhållanden och omständigheter som en hårdvaruförändring kan medföra. Prestanda och robusthet som de utvecklade regulatorerna erhåller har jämförts mot den existerande regulatorstrukturen. Tillvägagångssättet har varit att implementera reglerstrategierna i Matlab/Simulink samt simulera med tillhörande motormjukvara som Volvo CE tillhandahållit. I nästa fas skulle regulatorerna testas och verifieras i en riktig maskin. Fokuset har under detta examensarbete riktats mot de två adaptiva reglerstrategierna Model-Reference Adaptive Control (MRAC) och L1 Adaptive Control. MRAC-strukturen bygger på att specificera prestandan genom en referens-modell som det riktiga systemet skall följa. Varje gång en avvikelse uppstår så beräknas en lämplig styrsignal genom att beakta och försöka minimera skillnaden mellan det riktiga systemet och den önskade referens-modellen. Till detta modelleras och skattas störningar som regulatorn skall kompensera för. Tekniken inom L1 Adaptive Control är en utvidgning av MRAC. Önskat beteende specificeras även för denna regulatorstruktur men största skillnaden är att innan styrsignalen matas in till systemet så lågpassfiltreras den. Detta görs i förebyggande syfte för att inte släppa in onödigt höga frekvenser in i systemet. Resultaten visar att adaptiv reglering av motorvarvtalet har potential. Referensföljning och undertryckning av störningar hanteras väl och simuleringar har dessutom visat att de utvecklade regulatorerna kan hantera hårdvaruändringar. En av de utvecklade L1-regulatorerna implementerades i en riktig maskin och resultaten såg lovande ut.
Ng, Kwai Choi Stanley. "Regulation strategies for process control". Thesis, University of Sunderland, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337287.
Texto completoGoel, Anukul. "Control strategies for supercavitating vehicles". [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE0000537.
Texto completoHaviland, Jesse. "Control strategies for reactive manipulation". Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/236551/1/Jesse%2BHaviland%2BThesis%282%29.pdf.
Texto completoLuu, Ngoc An. "Control and management strategies for a microgrid". Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT075/document.
Texto completoToday and in the future, the increase of fuel price, deregulation and environment constraints give more opportunities for the usage of the renewable energy sources (RES) in power systems. A microgrid concept is needed in order to integrate the renewable sources in the electrical grid. It comprises low voltage (LV) system with distributed energy resources (DERs) together with storage devices and flexible loads. The integration of RES into a microgrid can cause challenges and impacts on microgrid operation. Thus, in this thesis, an optimal sizing and security, reliability and economic efficiency operation strategies of a microgrid including photovoltaic productions (PV), battery energy storage systems (BESS) and/or diesels is proposed. Firstly, the iterative optimization technique is used to find the optimal sizing of a microgrid. Secondly, the voltage and frequency control strategies for an island microgrid by using droop control methods are studied. Furthermore, we propose intelligent voltage and frequency control strategies by using fuzzy logic. By this way, the frequency is expressed not only as the function of active power but also the state of charge of BESS and the operation states of microgrid. And finally, a method to optimize the energy management in operation of a microgrid is proposed in this thesis. Dynamic programming is used to find the minimum the cost of fuel considering the emissions by scheduling of distributed energy resources (DERs) in an island microgrid as well as to minimize the cash flows and the exchanged power with the main grid in a grid-connected mode. The simulation results obtained show the accuracy and efficiency of the proposed solutions
Kasburg, Cristiane Regina. "Seleção e caracterização de isolados de fungos entomopatogênicos visando ao controle do ácaro vermelho Dermanyssus gallinae (Acari: Dermanyssidae)". Universidade Estadual do Oeste do Parana, 2016. http://tede.unioeste.br:8080/tede/handle/tede/711.
Texto completoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
Brazil is one of the largest producers of eggs, and this production is constantly growing, based on investment independent producers and the creation of cooperatives. Brazilian poultry facilities are mainly in wood with metal cages. There are few fully automated poultry, mainly by the high initial investment they require. The wooden structures, usually older, favor the appearance of some arthropod pests, as the poultry red mite Dermanyssus gallinae (De Geer, 1778) (Acari: Dermanyssidae). This mite is hematophagous and features gregarious and nocturnal behavior, spending the day hiding in cracks and crevices of the poultry houses, timber slots, dirt and debris accumulation of food and cobwebs. Among the damage caused by this mite infestation highlights the stress of birds, dermatitis and anemia, which can cause a decrease in production. Moreover, D. gallinae can also be transmitter the bacteria genus Salmonella, viruses of Newcastle disease and avian pox. Control strategies are mainly based on the use of chemical acaricides, which present risks to animals, poultry farmers and eggs consumers by residues in the eggs. Also, can select populations of resistant mites. Currently, the integrated management with use of less impactful strategies has been researched aiming their use at the field level. Among these strategies include the use of extracts and essential oils, inert powders (diatomaceous earth, silicas, talc), predators and entomopathogenic fungi. The entomopathogenic fungus has emerged as one of the most efficient techniques to control D. gallinae in laboratory conditions, but with a few field studies. The combination of these control strategies are also being studied aiming to find a method that is efficient and at the same time represents no risk to human and animal health.
O Brasil está entre os maiores produtores mundiais de ovos, sendo esta produção em constante crescimento, impulsionada principalmente por investimento de produtores independentes e da criação de cooperativas. As instalações aviárias brasileiras são principalmente em madeira com gaiolas metálicas. Há poucos aviários completamente automatizados, principalmente pelo alto investimento inicial que estes exigem. As estruturas em madeira, geralmente mais antigas, favorecem o aparecimento de alguns artrópodes-pragas, dentre os quais destaca-se o ácaro vermelho das galinhas Dermanyssus gallinae (De Geer, 1778) (Acari: Dermanyssidae). Este ácaro é hematófago e apresenta comportamento gregário e hábitos noturnos, passando o dia escondido em frestas e fendas dos aviários, ranhuras da madeira, restos de sujeira e acúmulo de comida e teias de aranha. Dentre os prejuízos causados pelas infestações deste ácaro, destacam-se o estresse das aves, a dermatite e a anemia, a qual pode ocasionar diminuição da produção. Além disso, D. gallinae também pode ser transmissor de bactérias do gênero Salmonella, vírus causadores da doença de Newcastle e da varíola aviária. As estratégias de controle são baseadas principalmente no uso de acaricidas químicos, os quais representam riscos aos animais, aos avicultores, aos consumidores pelos resíduos que podem deixar nos ovos, além de selecionar populações de ácaros resistentes. Atualmente, o manejo integrado com utilização de estratégias menos impactantes está sendo pesquisado, visando sua utilização no controle da praga. Dentre estas estratégias, destacam-se os extratos e óleos essenciais vegetais, pós inertes (terra de diatomáceas, sílicas, talcos), predadores e fungos entomopatogênicos. Os fungos entomopatogênicos têm se apresentado como uma das técnicas mais eficientes para controle de D. gallinae em condições de laboratório, porém com poucos estudos de campo. A combinação destas estratégias de controle também estão sendo pesquisadas visando encontrar um método que seja eficiente e ao mesmo tempo não represente riscos a saúde animal e humana.
Damke, Joice Franciele Wendling. "Sistemas de controle estratégico e contratos psicológicos: um estudo na Fundação Parque Tecnológico Itaipu – Brasil". Universidade Estadual do Oeste do Paraná, 2017. http://tede.unioeste.br/handle/tede/3596.
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An increasing number of studies have sought to analyze the relationship between managerial systems control and psychological contracts. There are few studies that evaluate this relationship through the strategic levers of control proposed by Simons (1995). Combining variables in these dimensions, this study aimed to investigate the relationship between strategic systems control and psychological contracts at Itaipu Technological Park Foundation - Brazil. Data collected from a survey of 197 respondents using Simon´s model (1995) as a construct for strategic systems control and by Rousseau (1989, 1995) for psychological contracts and investigated by correlation analyzes revealed positive associations between strategic levers of control and psychological contracts, highlighting the levers of diagnostic and interactive systems, which produced the highest correlations with psychological contracts in the research organization. The results show the relationship of strategic control levers' interdependence in the development of psychological contracts and point to gaps (discrepancies) between expected and performed in terms of the formal use of control systems, one of the managerial contributions of this study
Um número crescente de estudos tem buscado analisar a relação entre sistemas de controles gerenciais e contratos psicológicos. São raros os estudos que avaliam esta relação por meio das alavancas de controle estratégico propostos por Simon (1995). Conjugando variáveis nessas dimensões, este estudo objetivou investigar a relação entre sistemas de controle estratégico e contratos psicológicos na Fundação Parque Tecnológico Itaipu Brasil. Dados levantados em survey junto a 197 respondentes utilizando o modelo de Simon (1995) como constructo para sistemas de controle estratégico, de Rousseau (1989; 1995) para contratos psicológicos, e investigados por análises de correlações, revelaram associações positivas entre as alavancas de controle estratégico e contratos psicológicos, com destaque para as alavancas dos sistemas diagnósticos e interativos, que produziram as maiores correlações com contratos psicológicos na organização pesquisada. Os resultados evidenciam a relação de interdependência das alavancas de controle estratégico no desenvolvimento de contratos psicológicos e apontam os gaps (discrepâncias) entre o esperado e o desempenhado em termos da utilização formal dos sistemas de controle, uma das contribuições de natureza gerencial deste estudo.
Munoz, Carpintero Diego Alejandro. "Strategies in robust and stochastic model predictive control". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:2f6bce71-f91f-4d5a-998f-295eff5b089a.
Texto completoLaws, Christopher Neil. "Dynamic routing in queueing networks". Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385435.
Texto completoSethuraman, Shanthi. "Variable sampling interval control strategies for a process control problem". Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/40313.
Texto completoSkelton, Claude Eugene II. "Mixed Control Moment Gyro and Momentum Wheel Attitude Control Strategies". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9677.
Texto completoMaster of Science
Sabattini, Lorenzo <1983>. "Nonlinear Control Strategies for Cooperative Control of Multi-Robot Systems". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4465/1/sabattini_lorenzo_tesi.pdf.
Texto completoSabattini, Lorenzo <1983>. "Nonlinear Control Strategies for Cooperative Control of Multi-Robot Systems". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4465/.
Texto completoIbrahim, Khan M. "Tuberculosis in Pakistan improving control strategies /". [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=969899300.
Texto completoKørte, Steffen Østensjø. "Guidance & Control Strategies for UUVs". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16228.
Texto completoAl-Mudhaffar, Azhar. "Impacts of Traffic Signal Control Strategies". Doctoral thesis, Stockholm : Division of transports and logistics, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4268.
Texto completoZolotas, Argyrios C. "Advanced control strategies for tilting trains". Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/4279.
Texto completoChacón, Vásquez Mercedes. "Strategies for wireless networked control systems". Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28771.
Texto completoChen, Xin 1973. "Coordinating inventory control and pricing strategies". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29598.
Texto completoIncludes bibliographical references (p. 127-130).
Traditional inventory models focus on effective replenishment strategies and typically assume that a commodity's price is exogenously determined. In recent years, however, a number of industries have used innovative pricing strategies to manage their inventory effectively. These developments call for models that integrate inventory control and pricing strategies. Such models are clearly important not only in the retail industry, where price-dependent demand plays an important role, but also in manufacturing environments in which production/distribution decisions can be complemented with pricing strategies to improve the firm's bottom line. To date, the literature has confined itself mainly to models with variable ordering costs but no fixed costs. Extending some of these models to include a fixed cost component is the main focus of this thesis. In this thesis, we start by analyzing a single product, periodic review joint inventory control and pricing model, and characterizing the structure of the optimal policy under various conditions. Specifically, for the finite horizon periodic review case, we show, by employing the classical k-convexity concept, that a simple policy, called (s, S, p), is optimal when the demand functions are additive. For the model with more general demand functions, we show that an (s, S, p) policy is not necessarily optimal. We introduce a new concept, the symmetric k-convex functions, and apply it to provide a characterization of the optimal policy. Surprisingly, in the infinite horizon periodic review case, the concept of symmetric k-convex functions allows us to show that a stationary (s, S, p) policy is optimal for both discounted and average profit models even for general demand functions.
(cont.) Our approach developed for the infinite horizon periodic review joint inventory control and pricing problem is then extended to a corresponding continuous review model. In this case, we prove that a stationary (s, S, p) policy is optimal under fairly general assumptions. Finally, the symmetric k-convexity concept developed in this thesis is employed to characterize the optimal policy for the stochastic cash balance problem.
by Xin Chen.
Ph.D.
Abuzeid, Mustafa R. "Advanced braking control strategies for trains". Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/32027.
Texto completoWeidman, Justin Earl. "Dust Control Usage: Strategic Technology Interventions". Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/26562.
Texto completoPh. D.
Round, Philip A. "Simulation of robot manipulator control strategies". Thesis, Aston University, 1988. http://publications.aston.ac.uk/11918/.
Texto completoDevereux, David. "Control strategies for whole arm grasping". Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/control-strategies-for-whole-arm-grasping(02ddb06c-3264-46e1-818a-8632b1bb05c4).html.
Texto completoAuret, Erika Elizabeth. "Control strategies for citrus postharvest diseases". Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-06192006-084845.
Texto completoGraciano, José Eduardo Alves. "Real time optimization in chemical process: evaluation of strategies, improvements and industrial application". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-12072016-094348/.
Texto completoO aumento da concorrência motiva a indústria a implementar ferramentas que melhorem a eficiência de seus processos. A automação é uma dessas ferramentas, e o Real Time Optimization (RTO) ou Otimização em Tempo Real, é uma metodologia de automação que considera aspectos econômicos e restrições de processos e equipamentos para atualizar o controle do processo, de acordo com preços de mercado e distúrbios. Basicamente, o RTO usa um modelo fenomenológico em estado estacionário para predizer o comportamento do processo, em seguida, otimiza uma função objetivo econômica sujeita a esse modelo. Embora amplamente utilizado na indústria, não há ainda um consenso geral sobre os benefícios da implementação do RTO, devido a algumas limitações discutidas no presente trabalho: incompatibilidade estrutural entre planta e modelo, problemas de identificabilidade e baixa frequência de atualização dos set points. Algumas metodologias de RTO foram propostas na literatura para lidar com o problema da incompatibilidade entre planta e modelo. No entanto, não há uma comparação que avalie a abrangência e as limitações destas diversas abordagens de RTO, sob diferentes aspectos. Por esta razão, o método clássico de RTO é comparado com metodologias mais recentes, baseadas em derivadas (Modifier Adaptation, Integrated System Optimization and Parameter estimation, and Sufficient Conditions of Feasibility and Optimality), utilizando-se o método de Monte Carlo. Os resultados desta comparação mostram que o método clássico de RTO é coerente, desde que seja proporcionado um modelo suficientemente flexível para se representar a topologia do processo, um método de estimação de parâmetros apropriado para lidar com características de ruído de medição e um método para melhorar a qualidade da informação da amostra. Já os problemas de identificabilidade podem ser observados a cada iteração de RTO, quando o método atualiza alguns parâmetros-chave do modelo, o que é causado principalmente pela ausência de medidas e ruídos. Por esse motivo, quatro abordagens de estimação de parâmetros (Discriminação Rotacional, Seleção Automática e Estimação de Parâmetros, Reparametrização via Geometria Diferencial e o clássico Mínimos Quadrados não-lineares) são avaliados em relação à sua capacidade de predição, robustez e velocidade. Os resultados revelam que o método de Discriminação Rotacional é o mais adequado para ser implementado em um ciclo de RTO, já que requer menos informação a priori, é simples de ser implementado e evita o sobreajuste observado no método de Mínimos Quadrados. A terceira desvantagem associada ao RTO é a baixa frequência de atualização dos set points, o que aumenta o período em que o processo opera em condições subotimas. Uma alternativa para lidar com este problema é proposta no presente trabalho, integrando-se o RTO e o Self-Optimizing Control (SOC) através de um novo algoritmo de Model Predictive Control (MPC). Os resultados obtidos com a nova abordagem demonstram que é possível reduzir o problema da baixa frequência de atualização dos set points, melhorando o desempenho econômico do processo. Por fim, os aspectos práticos da implementação do RTO são discutidos em um estudo de caso industrial, que trata de um processo de destilação com bomba de calor, localizado na Refinaria de Paulínia (REPLAN - Petrobras). Os resultados deste estudo sugerem que os parâmetros do modelo são estimados com sucesso pelo método de Discriminação Rotacional; que o RTO é capaz de aumentar o lucro do processo em cerca de 3%, o equivalente a 2 milhões de dólares por ano; e que a integração entre SOC e RTO pode ser uma alternativa interessante para o controle deste processo de destilação.