Academic literature on the topic 'Closed loops'

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Journal articles on the topic "Closed loops"

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Goodaire, Edgar G., and D. A. Robinson. "Some Special Conjugacy Closed Loops." Canadian Mathematical Bulletin 33, no. 1 (March 1, 1990): 73–78. http://dx.doi.org/10.4153/cmb-1990-013-9.

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Nagy, Péter T., and Karl Strambach. "Loops as Invariant Sections in Groups, and their Geometry." Canadian Journal of Mathematics 46, no. 5 (October 1, 1994): 1027–56. http://dx.doi.org/10.4153/cjm-1994-059-8.

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AbstractWe investigate left conjugacy closed loops which can be given by invariant sections in the group generated by their left translations. These loops are generalizations of the conjugacy closed loops introduced in [13] just as Bol loops generalize Moufang loops. The relations of these loops to common classes of loops are studied. For instance on a connected manifold we construct proper topological left conjugacy closed loops satisfying the left Bol condition but show that any differentiable such loop must be a group. We show that the configurational condition in the 3-net corresponding to an isotopy class of left conjugacy closed loops has the same importance in the geometry of 3-nets as the Reidemeister or the Bol condition.
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Struys, Michel M. R. F., Eric P. Mortier, and Tom De Smet. "Closed loops in anaesthesia." Best Practice & Research Clinical Anaesthesiology 20, no. 1 (March 2006): 211–20. http://dx.doi.org/10.1016/j.bpa.2005.08.012.

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Yew, Boon K., Sree V. Chintapalli, Graham G. C. Upton, and Christopher A. Reynolds. "Conservation of closed loops." Journal of Molecular Graphics and Modelling 26, no. 3 (October 2007): 652–55. http://dx.doi.org/10.1016/j.jmgm.2007.03.011.

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Ferreira, L. P., E. Ares, G. Peláez, A. Resano, C. J. Luis-Pérez, and B. Tjahjono. "Simulation of a Closed-Loops Assembly Line." Key Engineering Materials 502 (February 2012): 127–32. http://dx.doi.org/10.4028/www.scientific.net/kem.502.127.

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The aim of the work presented in this paper describes the development of a decision support system based on a discrete-event simulation model of an automobile assembly line. The model focuses at a very specific class of production lines with a four closed-loop network configuration. One key characteristic in the closed-loop system is that the number of pallets inside the first three loops has been made constant. The impact of the number of pallets circulating on the first three closed-loops and of the proportion of four-door car bodies on the performance of the production line has been thoroughly investigated. This has been translated into the number of cars produced per hour, in order to improve the availability of the entire manufacturing system.
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Berezovsky, Igor N., and Edward N. Trifonov. "Flowering Buds of Globular Proteins: Transpiring Simplicity of Protein Organization." Comparative and Functional Genomics 3, no. 6 (2002): 525–34. http://dx.doi.org/10.1002/cfg.223.

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Structural and functional complexity of proteins is dramatically reduced to a simple linear picture when the laws of polymer physics are considered. A basic unit of the protein structure is a nearly standard closed loop of 25–35 amino acid residues, and every globular protein is built of consecutively connected closed loops. The physical necessity of the closed loops had been apparently imposed on the early stages of protein evolution. Indeed, the most frequent prototype sequence motifs in prokaryotic proteins have the same sequence size, and their high match representatives are found as closed loops in crystallized proteins. Thus, the linear organization of the closed loop elements is a quintessence of protein evolution, structure and folding.
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Guda Blessed, Ibrahim Aliyu, James Agajo, Thiago Lima Sarmento, Cleverson Veloso Nahum, Lucas Novoa, Rebecca Aben-Athar, et al. "Network resource allocation for emergency management based on closed-loop analysis." ITU Journal on Future and Evolving Technologies 3, no. 2 (September 22, 2022): 175–201. http://dx.doi.org/10.52953/hvpi8935.

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The telecommunication system being a critical pillar of emergency management, intelligent deployment and management of slices in an affected area will help emergency responders. Techniques such as automated management of Machine Learning (ML) pipelines across the edge and emergency responder devices, usage of hierarchical closed-loops, and offloading inference tasks closer to the edge can minimize latencies for first responders in case of emergencies. This study describes the major results from building a Proof of Concept (PoC) for network resource allocation for emergency management using a hierarchical autonomous Artificial Intelligence (AI)/ML-based closed-loops in the mobile network, organized by the Internal Telecommunication Union Focus Group on Autonomous Networks (ITU FG-AN). The background scenario for this PoC included the interaction between a higher closed-loop in the Operations Support System (OSS) and a lower closed-loop in Radio Access Network (RAN) to intelligently share RAN resources between the public and the emergency responder slice. Representation of closed-loop "controllers" in a declarative fashion (intent), triggering "imperative actions" in the "underlay" based on the intent, setup of a data pipeline between various components, and methods of "influencing" lower layer loops using specific logic/models, were some of the essential aspects investigated by various teams. The main conclusions are summarised in this paper, including the significant observations and limitations from the PoC as well as future directions.
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Guo, Hui Xin. "Design Optimization for the Robustness of Dimensional Tolerance by Using Evidence Theory." Applied Mechanics and Materials 483 (December 2013): 434–37. http://dx.doi.org/10.4028/www.scientific.net/amm.483.434.

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The design optimization of tolerance is researched to improve the robustness of plane dimension chain. The nonlinear functional relationship between the closed loop and the component loops of a dimension chain is formulated. The tolerances of component loops are regarded as design variables. The total manufacturing costs of the component loops and the success rate of assembly of the closed loop are treated as constraint conditions. Then, a robust design optimization model is established to minimize the variance of the closed loop and to make the mean value of the closed loop approach to target value. The evidence theory is used to deal with the constraint condition on the success rate of assembly. The dimension chain of a gear box is taken as an example to illustrate the proposed method and the example shows that the proposed method is effective.
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Kinyon, Michael K., Kenneth Kunen, and J. D. Phillips. "Diassociativity in Conjugacy Closed Loops." Communications in Algebra 32, no. 2 (March 2004): 767–86. http://dx.doi.org/10.1081/agb-120027928.

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Lynch, David K. "Optics: Reflections on closed loops." Nature 316, no. 6025 (July 1985): 216–17. http://dx.doi.org/10.1038/316216a0.

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Dissertations / Theses on the topic "Closed loops"

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Chintapalli, Sree Vamsee. "Closed loops in protein folding." Thesis, University of Essex, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494193.

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Artic, Katharina [Verfasser], Gerhard [Akademischer Betreuer] Hiß, and Alice C. [Akademischer Betreuer] Niemeyer. "On right conjugacy closed loops and right conjugacy closed loop folders / Katharina Artic ; Gerhard Hiß, Alice C. Niemeyer." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1130792870/34.

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Guay, Jamie Andrew. "Closed-loop insulin delivery." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60434.pdf.

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Jones, Melvin. "Closed loop performance monitoring." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-04122007-115205.

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Elfving, Maria. "Hydraulic closed loop control." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-234932.

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The purpose of the thesis work is to investigate methods for closedloop control of hydraulic pressure in transmissions to make them bemore precise. This is desirable since it decreases the fuel consumptionas well as emissions, and improves the driving performance.To be able to study the behaviour of the transmission, a Simulink modelis designed with the parts relevant to the problem, and from this a linearmodel is obtained. Three different controllers are designed andimplemented in the Simulink model, to compare and analyze differentsolutions. The controllers implemented are a PI controller, a PIDcontroller and a LQR controller.The results from the simulation with the different controllers showstep responses to be able to evaluate their individual performance. Theresults show that all of the controllers meet the requirements for a stepreponse under better conditions, but under worse ones the LQR controllerperforms best of the three. The LQR controller is therefore themost suitable of the three controllers for this particular problem.
Syftet med det här examensarbete är att undersöka olika metoder för återkopplad reglering av hydrauliskt tryck i en transmission för att göra det mer exakt. Detta är önskvärt eftersom det minskar bränsleåt- gången och utsläpp, och gör även körupplevelsen bättre. För att kunna studera transmission tas en Simulink-modell fram in- nehållande de delar som är relevanta för problemet, och från detta kan en linjär modell erhållas. Tre olika regulatorer tas fram och im- plementeras i Simulink-modellen, för att kunna jämföra och analysera de olika lösningarna. De regulatorer som tas fram är PI-regulator, PID- regulator och LQR-regualator. Resultaten från simuleringen med de olika regulatorerna visar stegs- var under varierande förutsättningar för att kunna utvärdera hur de presterar. Resultaten visar att alla regulatorer uppfyller kraven på ett stegsvar under bättre förhållanden, men LQR-regulatorn presterar bäst under svårare förhållanden. LQR-regulatorn är därför den mest relevanta reglerstrategin för det här problemet av de tre
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Fernandes, Pereira Sonia, and Nejat Hamid. "Closed-Loop Orchestration Solution." Thesis, KTH, Hälsoinformatik och logistik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253005.

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Computer networks are continuously evolving and growing in size and complexity. New technologies are being introduced which further increases the complexity. Net- work Service Orchestration is all about pushing configuration out into the network devices automatically without human intervention. There can be issues that causes the orchestration to fail. In many cases manual operations must be done to recover from the error which is very contradicting since the goal of orchestration is that it should be fully automated. There is some indication that the errors that are being solved manually could be de- tected and handled by a feedback mechanism. This thesis work aimed to build on current insight and if possible, verify that the feedback mechanism is a viable method. After consideration on different ways to solve the research question, the choice fell on creating a test environment where the approach was tested. The test environment was used to investigate if a network orchestration system could be integrated with a feedback mechanism. The result of this project presents a way to automatically de- tect a network failure and send feedback to a Network Service Orchestrator. The or- chestrator is then able to identify and correct the error.
Datornätverk utvecklas kontinuerligt och växer i storlek och komplexitet. Nyteknik införs som ytterligare ökar komplexiteten. Nätverksservice orkestrering handlar om att skicka ut konfiguration automatiskt till enheter i nätverket utan mänsklig in- blandning. Det kan finnas problem som gör att orkestreringen misslyckas. I många fall måste manuella åtgärder utföras för att lösa problemet, vilket är mycket motsä- gelsefullt, eftersom målet med orkestrering är att det ska vara fullt automatiserat. Det finns indikationer på att fel kan detekteras och hanteras av en återkopplings- mekanismen. Detta examensarbete syftar till att bygga på aktuell insikt, och om möj- ligt, verifiera att återkopplingsmekanismen är en möjlig metod. Efter överväganden på vilka olika sätt som projektmålet kunde uppnås föll valet på att skapa en testmiljö där ansatsen kunde testas. Testmiljön användes för att utreda om ett nätverksorkestreringssystem kan integreras med en återkopplings mekanism. Resultat av projektet presenterar ett sätt att automatiskt upptäcka ett nätverksfel och skicka återkoppling till ett nätverksorkestreringssystem. Nätverksorkestreraren kan sedan detektera och åtgärda felet.
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Mantzaridis, Haralmbos. "Closed-loop control of anaesthesia." Thesis, University of Strathclyde, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338938.

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Boudon, Benjamin. "Méthodologie de modélisation des systèmes mécatroniques complexes à partir du multi-bond graph : application à la liaison BTP-fuselage d’un hélicoptère." Thesis, Paris, ENSAM, 2014. http://www.theses.fr/2014ENAM0064/document.

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De par le fonctionnement de son rotor, l'hélicoptère est le siège de vibrations mécaniques importantes impactant notamment la fatigue des pièces mécaniques et le confort des passagers. La liaison BTP-Fuselage équipé du système SARIB est un système anti-vibratoire qui permet d'atténuer mono-fréquentiellement les vibrations transmises au fuselage. Des solutions intelligentes semi-actives sont donc étudiées afin que la filtration soit réglable en fonction des vibrations excitatrices. Ce type d'études souffre, par contre, d'un manque d'outils et de méthodes indispensables, d'une part, à la modélisation de systèmes mécaniques complexes et d'autre part, à l'élaboration d'une liaison intelligente. Ces travaux proposent une démarche de modélisation à partir d'un outil de modélisation structurel tel que le multi-bond graph (MBG) permettant une vision global et modulaire pour l'étude de systèmes mécaniques complexes tels qu'on peut les trouver sur un hélicoptère. Dans un premier temps, une analyse des outils de modélisation conduisant au choix du MBG a été présentée. Dans un second temps, les développements ont porté sur la modélisation MBG de la liaison BTP/ Fuselage 3D d'un banc d'essai réel qui a été conçu et réalisé au sein du laboratoire. Cette liaison est un système mécanique cinématiquement bouclé. Les équations de la dynamique d'un tel système forment un système d'équations algébro-différentiel (DAE) nécessitant des techniques de résolution spécifiques. Le modèle MBG de la liaison BTP-fuselage entier a été simulé à l'aide du logiciel 20-sim. Les résultats obtenus ont été vérifiés à l'aide du logiciel multicorps LMS Virtual Lab. Une comparaison des résultats obtenus par les deux méthodes a donné, pour différents cas d'excitations de la BTP (pompage, roulis, tangage), une corrélation très satisfaisante. Dans un troisième temps, le modèle MBG a été exploité pour la mise en place d'un dispositif de contrôle semi-actif. Le modèle du dispositif SARIB développé également sous 20-sim permet de régler la position des masses mobiles en fonctionnement de manière à minimiser le niveau de vibratoire du fuselage. L'algorithme de contrôle (algorithme de gradient) permet de calculer les consignes de position des masses mobiles sur les batteurs SARIB. La position des masses mobiles actionnée par un moteur électrique à courant continu et un système vis-écrou est ensuite asservie aux consignes générées par l'algorithme de contrôle. Enfin, la commande a pu être mise en place sur un modèle bond graph non-linéaire qui n'a pas nécessité une linéarisation en vue d'une transformation en fonction de transfert
Due to the operation of the rotor, the helicopter is subject to important vibrations affecting namely the fatigue of mechanical parts and the passengers comfort. The MGB-Fuselage joint equipped with the DAVI system is an anti-vibration system that helps to reduce, in a single frequency way, vibrations transmitted to the fuselage. Semi-active intelligent solutions are studied so that the filtering can be adjusted according to the vibration sources. Such studies suffer from a lack of tools and necessary methods, firstly, for the design of complex mechanical systems and secondly, for the development of an intelligent joint. This work proposes a modeling approach using a structural modeling tool : the multi-bond graph (MBG) which offers a global and modular view for the study of complex mechatronic systems such as helicopter. At first, an analysis of modeling tools leading to the selection of MBG is presented. Secondly, developments have focused on the MBG modeling of the 3D MGB-fuselage joint of an experimental setup which was designed and built in the laboratory. This joint is a mechanical system with kinematic loops. The equations of the dynamics of such system are a differential-algebraic system (DAE) requiring specific solving methods. The MBG model of the MGB-fuselage was simulated using the 20-sim software. The results were verified using the multibody software LMS Virtual Lab. A comparison of results obtained by the two methods led to a very good correlation to various cases of excitations of the MGB (pumping, roll, pitch). Thirdly, the MBG model was used for the establishment of semi-active control system. The model of the DAVI device also developed in 20-sim allows to adjust the position of the moving masses in operation so as to minimize the level of vibration of the fuselage. The control algorithm (gradient algorithm) enables to calculate the setpoint positions of the moving masses on the DAVI beaters. The position of the moving masses driven by an electric DC motor and a screw-nut system is then controlled to the setpoints generated by the control algorithm. Finally, the command could be implemented on a non-linear bond graph model which did not require a linearization to get a transfer function
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Reitze, Clemens. "Closed-Loop-Entwicklungsplattform für mechatronische Fahrdynamikregelsysteme." Karlsruhe : Univ.-Verl, 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973301791.

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Bakke, Morten. "Subspace Identification using Closed-Loop Data." Thesis, Norwegian University of Science and Technology, Department of Engineering Cybernetics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9951.

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The purpose of this thesis was to investigate how different subspace identification methods cope with closed loop data, and how the controller parameters affect the quality of the acquired models. Three different subspace methods were subject for investigation; the MOESP method, the N4SID method and the DSR_e method. It is shown through a simulation example that all three subspace methods will identify the correct open-loop model from closed-loop data if the data record is noise-free (deterministic identification with perfect data). This result is not a new one, but a confirmation of the results from other researchers. Among the three different subspace methods that were investigated, the DSR_e method developed by dr. David Di Ruscio gave the best overall results. This method is especially designed to cope with closed-loop data, different from the MOESP and N4SID methods. Controller gain is shown to have a significant effect on the quality of the identified model when there is noise present in the loop. It is shown by simulations that up to a point, higher controller gain during the identification experiment actually gives more accurate open-loop models than models identified with lower controller gain. One of the reasons for this is that high gain tuning provides a higher signal to noise ratio through amplification of the reference signal, rendering the noise in the data used for identification less significant. Another reason may be that frequencies in the input signals will be more concentrated around the achievable bandwidth of the controller, which produces system outputs with more information of the frequency response around this bandwidth frequency. This is turn will reveal frequency information from the system that is important for control purposes.

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Books on the topic "Closed loops"

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P, Flapper Simme Douwe, Nunen, J. A. E. E. van., and Wassenhove L. N. van, eds. Managing closed-loop supply chains. Berlin: Springer, 2005.

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Flapper, Simme Douwe P., Jo A. E. E. van Nunen, and Luk N. Van Wassenhove, eds. Managing Closed-Loop Supply Chains. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/b138818.

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Morana, Romy. Management von Closed-loop Supply Chains. Wiesbaden: Deutscher Universitätsverlag, 2006. http://dx.doi.org/10.1007/978-3-8350-9061-3.

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Tyrone, Fernando, ed. Closed-loop control of blood glucose. Berlin: Springer, 2007.

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Reaves, Joel C. Closed loop pole placement and cost analysis. Monterey, Calif: Naval Postgraduate School, 1989.

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Fred, Jones. Closed-loop geothermal systems: Slinky installation guide. Stillwater, Okla: Oklahoma State University, 1994.

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Jiang, Xunqing. Closed-loop system identification with operator intervention. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1999.

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Yang, Jianming. From Zero Waste to Material Closed Loop. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7683-3.

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Benndorf, Jörg. Closed Loop Management in Mineral Resource Extraction. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-40900-5.

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1923-, Ko Wen H., Mugica Jacques, Ripart Alain, Implantable Sensors Symposium (1984 : Monaco, Monaco), and Cardiostim Conference (1984 : Monaco, Monaco), eds. Implantable sensors for closed-loop prosthetic systems. Mount Kisco, N.Y: Futura Pub. Co., 1985.

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Book chapters on the topic "Closed loops"

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Habas, Christophe. "Cerebellar Closed-Loops." In Essentials of Cerebellum and Cerebellar Disorders, 343–47. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-24551-5_47.

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Buxbaum, Arne, Klaus Schierau, Alan Straughen, and R. Bonert. "Closed Control Loops." In Design of Control Systems for DC Drives, 104–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84006-7_15.

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Broderick, Damien. "Closed Timelike Loops." In The Time Machine Hypothesis, 25–36. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16178-1_3.

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Stephens, Donald R. "Digital Closed Loop Analysis." In Phase-Locked Loops for Wireless Communications, 153–81. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5717-3_6.

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Lilov, L. K. "Dynamics of Elastic Multibody Systems Involving Closed Loops." In Dynamics of Multibody Systems, 129–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82755-6_11.

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Kane, T. R., and H. Faessler. "Dynamics of Robots and Manipulators Involving Closed Loops." In Theory and Practice of Robots and Manipulators, 97–106. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4615-9882-4_11.

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Artic, Katharina, and Gerhard Hiss. "On Right Conjugacy Closed Loops of Twice Prime Order." In Group Theory and Computation, 1–27. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2047-7_1.

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Maiti, Santanu K., and S. N. Karmakar. "Electron Transport Through Mesoscopic Closed Loops and Molecular Bridges." In Springer Series in Solid-State Sciences, 267–304. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-72632-6_9.

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Abramsky, Samson. "Abstract Scalars, Loops, and Free Traced and Strongly Compact Closed Categories." In Algebra and Coalgebra in Computer Science, 1–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11548133_1.

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Yunmin, Wang, and Xu Kuangdi. "Closed Loop." In The ECPH Encyclopedia of Mining and Metallurgy, 1. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0740-1_24-1.

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Conference papers on the topic "Closed loops"

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Carlmeyer, Birte, David Schlangen, and Britta Wrede. "Towards Closed Feedback Loops in HRI." In the 2014 Workshop. New York, New York, USA: ACM Press, 2014. http://dx.doi.org/10.1145/2666499.2666500.

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Svingen, Bjo̸rnar, Morten Kjeldsen, and Roger E. A. Arndt. "Dynamics of Closed Circuit Hydraulic Model Loops." In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31003.

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This paper reviews the issue of making unsteady measurements involving cavitating flow in traditional test loops. Measurements of the dynamic response of a water tunnel during testing of a partially cavitating hydrofoil are presented and reviewed in the context of current theory. Data were collected from an array of pressure transducers that were distributed around the tunnel loop. In the post processing of these data, gain and phase response data were calculated. Theoretical analysis consisted of splitting the system into different elements, and included the compressibility of water in the physics used to describe each element. While solving the global system an eigenvalue solution was found, thus no node specific solution is obtained. This work is currently being extended with the aim of obtaining node specific values such that a more direct comparison between the experimental and theoretical work can be made.
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Li, Na, Li Zheng, and Quan-Lin Li. "Semiconductor system with multiple closed-loops constrains." In 2007 IEEE International Conference on Automation Science and Engineering. IEEE, 2007. http://dx.doi.org/10.1109/coase.2007.4341702.

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Callado, Tomas, Hamzah Farooqi, Tashu Gupta, Robert Taylor, and Ashwin Pazhetam. "Using Closed Feedback Loops to Evaluate Autonomous Juggling Performance." In 2020 IEEE MIT Undergraduate Research Technology Conference (URTC). IEEE, 2020. http://dx.doi.org/10.1109/urtc51696.2020.9668884.

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Wehage, R. A. "Solution of Multibody Dynamics Using Natural Factors and Iterative Refinement: Part II — Closed Kinematic Loops." In ASME 1989 Design Technical Conferences. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/detc1989-0116.

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Abstract A symbolic algorithm exploiting natural factors of generalized inertia matrices and iterative refinement to compute the dynamics of open kinematic-loop systems was developed in Part I of this paper. The general equations of motion for open and closed loop systems were derived in an earlier paper (Wehage, 1988) and it was shown that algorithms for open loop dynamics could be used to solve closed loop problems by cutting the secondary joints. In this paper it is shown that secondary joint forces can be obtained either from a dynamic force balance or from constraint surface deformations. Closed kinematic loops create additional numerical problems and require substantially more computational overhead. Therefore the iterative refinement algorithm developed in Part I is extended to address some of these problems. Exploitation of iterative refinement and computer architecture can substantially improve overall algorithm performance.
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6

Lo, Janzen, Dimitris Metaxas, and Norman I. Badler. "Controlling a Dynamic System With Open and Closed Loops: Application to Ladder Climbing." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4224.

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Abstract We develop a method for animating systems with open and closed loops and in particular ladder climbing for virtual world applications. Ladder climbing requires the modeling of dynamic open and closed-loop chains. We model the stance phase and the associated closed-loop dynamics, through the use of the Lagrange multiplier method which results in a system of differential algebraic equations (DAE). We use the Lagrange method for the dynamic formulation of the swing phase. The input to the algorithm is a given forward velocity, step length, step frequency and a chosen gait. The algorithm then determines the initial and final positions for each phase of ladder climbing. We use the Newton-Ralphson method to find the vector of joint torques that drives the dynamic system from the initial position to the final position. We use the Baumgarte stabilization method to achieve stability of the numerical integration. We present a series of real-time animations involving ladder climbing.
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7

Seki, Hiroya, and Takashi Shigemasa. "Closed-loop identification, diagnosis and retuning of oscillatory PID control loops in chemical processes." In Control (MSC). IEEE, 2010. http://dx.doi.org/10.1109/cca.2010.5611076.

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8

Sauter, D., F. Hamelin, and M. Ghetie. "Fault diagnosis in closed control loops via frequency domain approach." In 1997 European Control Conference (ECC). IEEE, 1997. http://dx.doi.org/10.23919/ecc.1997.7082494.

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9

Duan, Shanzhong, and Andrew Ries. "Efficient Parallel Computer Simulation of the Motion Behaviors of Closed-Loop Multibody Systems." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41912.

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This paper presents an efficient parallelizable algorithm for the computer-aided simulation and numerical analysis of motion behaviors of multibody systems with closed-loops. The method is based on cutting certain user-defined system interbody joints so that a system of independent multibody subchains is formed. These subchains interact with one another through associated unknown constraint forces fc at the cut joints. The increased parallelism is obtainable through cutting joints and the explicit determination of associated constraint forces combined with a sequential O(n) method. Consequently, the sequential O(n) procedure is carried out within each subchain to form and solve the equations of motion while parallel strategies are performed between the subchains to form and solve constraint equations concurrently. For multibody systems with closed-loops, joint separations play both a role of creation of parallelism for computing load distribution and a role of opening a closed-loop for use of the O(n) algorithm. Joint separation strategies provide the flexibility for use of the algorithm so that it can easily accommodate the available number of processors while maintaining high efficiency. The algorithm gives the best performance for the application scenarios for n>>1 and n>>m, where n and m are number of degree of freedom and number of constraints of a multibody system with closed-loops respectively. The algorithm can be applied to both distributed-memory parallel computing systems and shared-memory parallel computing systems.
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Gao, Jinsong, Kenneth W. Chase, and Spencer P. Magleby. "Comparison of Assembly Tolerance Analysis by the Direct Linearization and Modified Monte Carlo Simulation Methods." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0047.

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Abstract Two methods for performing statistical tolerance analysis of mechanical assemblies are compared: the Direct Linearization Method (DLM), and Monte Carlo simulation. A selection of 2-D and 3-D vector models of assemblies were analyzed, including problems with closed loop assembly constraints. Closed vector loops describe the small kinematic adjustments that occur at assembly time. Open loops describe critical clearances or other assembly features. The DLM uses linearized assembly constraints and matrix algebra to estimate the variations of the assembly or kinematic variables, and to predict assembly rejects. A modified Monte Carlo simulation, employing an iterative technique for closed loop assemblies, was applied to the same problem set. The results of the comparison show that the DLM is accurate if the tolerances are relatively small compared to the nominal dimensions of the components, and the assembly functions are not highly nonlinear. Sample size is shown to have great influence on the accuracy of Monte Carlo simulation.
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Reports on the topic "Closed loops"

1

Sienicki, James J., and Christopher Grandy. Irradiation Testing Vehicles for Fast Reactors from Open Test Assemblies to Closed Loops. Office of Scientific and Technical Information (OSTI), December 2016. http://dx.doi.org/10.2172/1347144.

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2

Marshak, Ronni. Closed-Loop Meta-Process Management. Boston, MA: Patricia Seybold Group, February 2002. http://dx.doi.org/10.1571/psgp2-21-02cc.

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3

Jakeway, Lee, and Mae Nakahata. Closed Loop Biomass Co-Firing. Office of Scientific and Technical Information (OSTI), April 2000. http://dx.doi.org/10.2172/764428.

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Meador, Christopher L. Closed Loop Fluid Delivery System. Fort Belvoir, VA: Defense Technical Information Center, February 2014. http://dx.doi.org/10.21236/ada597495.

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Breuer, Kenneth. Closed Loop Control and Turbulent Flows. Fort Belvoir, VA: Defense Technical Information Center, October 2005. http://dx.doi.org/10.21236/ada443535.

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Navarro, G. E. Closed loop cooling operation with MICON. Office of Scientific and Technical Information (OSTI), May 1995. http://dx.doi.org/10.2172/80948.

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Kramer, George C. Closed-Loop Resuscitation of Hemorrhagic Shock. Fort Belvoir, VA: Defense Technical Information Center, February 2011. http://dx.doi.org/10.21236/ada542181.

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8

Laub, Alan J. Numerical Methods for Closed-Loop Control. Fort Belvoir, VA: Defense Technical Information Center, June 1991. http://dx.doi.org/10.21236/ada248481.

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Imel, George R., Benjamin Baker, Tony Riley, Adam Langbehn, Harishchandra Aryal, and M. Lamine Benzerga. Study of the Open Loop and Closed Loop Oscillator Techniques. Office of Scientific and Technical Information (OSTI), April 2015. http://dx.doi.org/10.2172/1178570.

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10

Williams, P. F., and N. J. Ianno. Closed Loop Control of Advanced Manufacturing Processes. Fort Belvoir, VA: Defense Technical Information Center, May 2002. http://dx.doi.org/10.21236/ada402583.

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