Thematische Bibliographien / Finite gain theory

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Auswahl der wissenschaftlichen Literatur zum Thema „Finite gain theory“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 20. Februar 2023

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Zeitschriftenartikel zum Thema "Finite gain theory"

Cavaleri, Matteo, and Alfredo Donno. "On cospectrality of gain graphs." Special Matrices 10, no. 1 (January 1, 2022): 343–65. http://dx.doi.org/10.1515/spma-2022-0169.

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Abstract We define G G -cospectrality of two G G -gain graphs ( Γ , ψ ) \left(\Gamma ,\psi ) and ( Γ ′ , ψ ′ ) \left(\Gamma ^{\prime} ,\psi ^{\prime} ) , proving that it is a switching isomorphism invariant. When G G is a finite group, we prove that G G -cospectrality is equivalent to cospectrality with respect to all unitary representations of G G . Moreover, we show that two connected gain graphs are switching equivalent if and only if the gains of their closed walks centered at an arbitrary vertex v v can be simultaneously conjugated. In particular, the number of switching equivalence class

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Mattos, Lucas Prado, Manuel Ernani Cruz, and Julián Bravo-Castillero. "Finite element computation of the effective thermal conductivity of two-dimensional multi-scale heterogeneous media." Engineering Computations 35, no. 5 (July 2, 2018): 2107–23. http://dx.doi.org/10.1108/ec-11-2017-0444.

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Purpose The simulation of heat conduction inside a heterogeneous material with multiple spatial scales would require extremely fine and ill-conditioned meshes and, therefore, the success of such a numerical implementation would be very unlikely. This is the main reason why this paper aims to calculate an effective thermal conductivity for a multi-scale heterogeneous medium. Design/methodology/approach The methodology integrates the theory of reiterated homogenization with the finite element method, leading to a renewed calculation algorithm. Findings The effective thermal conductivity gain of

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Sharma, Anshul, C. K. Susheel, Rajeev Kumar, and V. S. Chauhan. "Active Control of Thermally Induced Vibrations in Smart Structure Instrumented with Piezoelectric Materials." Applied Mechanics and Materials 612 (August 2014): 169–74. http://dx.doi.org/10.4028/www.scientific.net/amm.612.169.

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In this paper, a finite element model of piezolaminated composite shell structure is developed using nine-noded degenerated shell element. The stiffness, mass and thermo-electro-mechanical coupling effect is incorporated in finite element modeling using first order shear deformation theory and linear piezoelectric theory. The sensor voltage is calculated using the same formulation and fuzzy logic controller is used to calculate the actuator voltage. The fuzzy logic controller is designed as double input-single output (DISO) system using 49 If-Then rules. The performance of fuzzy logic controll

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Zhao, Zhanshan, Xiaomeng Li, Jing Zhang, and Yongzhen Pei. "Terminal sliding mode control with self-tuning for coronary artery system synchronization." International Journal of Biomathematics 10, no. 03 (February 20, 2017): 1750041. http://dx.doi.org/10.1142/s1793524517500413.

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A terminal sliding mode (TSM) control with self-tuning gain algorithm is proposed for the synchronization of coronary artery system under the existence of the unmodeled dynamics and the external disturbance. Considering the sliding mode dynamics of system, a criterion of selecting the parameters is derived to reach the point of equilibrium in the finite time. The theoretic analysis based on Lyapunov theory proved that the systems with the proposed TSM control with self-tuning scheme could be stabilized in finite time. The proposed method shows that the drive and response systems are synchroniz

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Deng, Xiongfeng, Yiqing Huang, and Lisheng Wei. "Adaptive Fuzzy Command Filtered Finite-Time Tracking Control for Uncertain Nonlinear Multi-Agent Systems with Unknown Input Saturation and Unknown Control Directions." Mathematics 10, no. 24 (December 8, 2022): 4656. http://dx.doi.org/10.3390/math10244656.

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This paper investigates the finite-time consensus tracking control problem of uncertain nonlinear multi-agent systems with unknown input saturation and unknown control directions. An adaptive fuzzy finite-time consensus control law is proposed by combining the fuzzy logic system, command filter, and finite-time control theory. Using the fuzzy logic systems, the uncertain nonlinear dynamics are approximated. Considering the command filter and backstepping control technique, the problem of the so-called “explosion of complexity” in the design of virtual control laws and adaptive updating laws is

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Zhang, Xin Yu, and Li Kun Guan. "Stress Analysis and Structure Improvement on Arm of Ladle Turret." Applied Mechanics and Materials 597 (July 2014): 336–40. http://dx.doi.org/10.4028/www.scientific.net/amm.597.336.

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Static stress analysis on arm of ladle turret is based on finite element (FE) theory and shell theory by finite element software ANSYS. In this paper, an arm subjected to a multi-axial state of stress is examined both numerically and experimentally. The hot spot strains and stresses in the connection are determined through a detailed finite element analysis (FEA) of the joint. The arm geometry is accurately modeled using FE. Check the dangerous position on the side of the arm by different safety factor. For the experimental study, a test rig is designed and used to validate the FE model. Gain

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Brandt, Bastian B., Gergely Endrődi, and Sebastian Schmalzbauer. "QCD at finite isospin chemical potential." EPJ Web of Conferences 175 (2018): 07020. http://dx.doi.org/10.1051/epjconf/201817507020.

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We investigate the properties of QCD at finite isospin chemical potential at zero and non-zero temperatures. This theory is not affected by the sign problem and can be simulated using Monte-Carlo techniques. With increasing isospin chemical potential and temperatures below the deconfinement transition the system changes into a phase where charged pions condense, accompanied by an accumulation of low modes of the Dirac operator. The simulations are enabled by the introduction of a pionic source into the action, acting as an infrared regulator for the theory, and physical results are obtained by

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Ma, Xin, and Fang Zhu. "Prescribed Performance Synchronization Control of Chaotic Systems with Unknown Control Gain Signs." Journal of Control Science and Engineering 2021 (July 23, 2021): 1–7. http://dx.doi.org/10.1155/2021/5160768.

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For a class of uncertain nonlinear chaotic systems with unknown control gain signs and saturated input, by means of Nussbaum function, a scheme of finite-time prescribed performance synchronization control is proposed. Here, Nussbaum function is used to eliminate the influence of unknown control gain signs, and fuzzy logic systems are used to estimate unknown functions. Lyapunov theory is used to prove that all synchronization errors converge to a predefined small performance range under the designed control method. Finally, simulation results are provided to illustrate the feasibility of the

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Zhang, Chao, Qiang Guo, and Jing Wang. "Finite-Time Synchronizing Control for Chaotic Neural Networks." Abstract and Applied Analysis 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/938612.

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This paper addresses the finite-time synchronizing problem for a class of chaotic neural networks. In a real communication network, parameters of the master system may be time-varying and the system may be perturbed by external disturbances. A simple high-gain observer is designed to track all the nonlinearities, unknown system functions, and disturbances. Then, a dynamic active compensatory controller is proposed and by using the singular perturbation theory, the control method can guarantee the finite-time stability of the error system between the master system and the slave system. Finally,

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Jian, Xiong, Zengyun Wang, Aitong Xin, Yujing Chen, and Shujuan Xie. "An improved finite-time stabilization of discontinuous non-autonomous IT2 T-S fuzzy interconnected complex-valued systems: A fuzzy switching state-feedback control method." Electronic Research Archive 31, no. 1 (2022): 273–98. http://dx.doi.org/10.3934/era.2023014.

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<abstract><p>Based on the type-2 Takagi-Sugeno (IT2 T-S) fuzzy theory, a non-autonomous fuzzy complex-valued dynamical system with discontinuous interconnection function is formulated. Under the framework of Filippov, the finite-time stabilization (FTS) problem is investigated by using an indefinite-derivative Lyapunov function method, where the derivative of the constructed Lyapunov function is allowed to be positive. By designing a fuzzy switching state feedback controller involving time-varying control gain parameters, several sufficient criteria are established to determine the

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Dissertationen zum Thema "Finite gain theory"

Dong, Shijie, of Western Sydney Hawkesbury University, and Faculty of Science and Technology. "Robust nonlinear process control by L2 finite gain theory." THESIS_FST_XXX_Dong_S.xml, 1998. http://handle.uws.edu.au:8081/1959.7/386.

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This thesis focuses on nonlinear robust process control synthesis and analysis. The theoretical fundamental is the L2 finite gain theory. The aim of this research is to gain better understanding of this theory and develop new process control synthesis and analysis methods for nonlinear processes with model uncertainties and unmeasured disturbances.The current nonlinear process control methods are examined in this thesis. The research scopes of this study are described as follows: 1/. To characterize the most common process control problems such as zero-offset requirement, presentation of model

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Dong, Shijie. "Robust nonlinear process control by L2 finite gain theory." Thesis, [Richmond, N.S.W.] : Faculty of Science and Technology, University of Western Sydney Hawkesbury, 1998. http://handle.uws.edu.au:8081/1959.7/386.

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Dong, Shijie. "Robust nonlinear process control by L2 finite gain theory : a thesis submitted in fulfillment of the requirements for the degree of doctor of philosophy /." [Richmond, N.S.W.] : Faculty of Science and Technology, University of Western Sydney Hawkesbury, 1998. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030520.122605/index.html.

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Li, Yunyan. "Global finite-time observers for a class of nonlinear systems." Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/40825.

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The contributions of this thesis lie in the area of global finite-time observer design for a class of nonlinear systems with bounded rational and mixed rational powers imposed on the incremental rate of the nonlinear terms whose solutions exist and are unique for all positive time. In the thesis, two different kinds of nonlinear global finite-time observers are designed by employing of finite-time theory and homogeneity properties with different methods. The global finite-time stability of both proposed observers is derived on the basis of Lyapunov theory. For a class of nonlinear system

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Daniyan, Abdullahi. "Advanced signal processing techniques for multi-target tracking." Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/35277.

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The multi-target tracking problem essentially involves the recursive joint estimation of the state of unknown and time-varying number of targets present in a tracking scene, given a series of observations. This problem becomes more challenging because the sequence of observations is noisy and can become corrupted due to miss-detections and false alarms/clutter. Additionally, the detected observations are indistinguishable from clutter. Furthermore, whether the target(s) of interest are point or extended (in terms of spatial extent) poses even more technical challenges. An approach known as ran

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Bücher zum Thema "Finite gain theory"

Brink, David O., Susan Sauvé Meyer, and Christopher Shields, eds. Virtue, Happiness, Knowledge. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198817277.001.0001.

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Fifteen leading philosophers explore a set of themes from the pioneering work of Gail Fine and Terence Irwin, in ancient philosophy but also in later periods and in systematic philosophy. The contributors discuss knowledge, rhetoric, freedom and practical reason, virtue and the good life, ethics and politics in Plato and Aristotle and beyond. The editors offer an introduction charting the scholarly contributions of Fine and Irwin and assessing their individual and joint impact, together with a complete bibliography of their writings. This volume is a token of our immense gratitude to Gail Fine

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Idris, Murad. Assigning Symmetry. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190658014.003.0002.

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Chapter 1 examines peace and war in Plato’s Laws. The dialogue’s speakers schematize war along an aesthetic pattern of symmetry, of polis against polis, person against person. These wars suggest an orderly universe. Ultimately, they locate peace in a different aesthetic—namely, the wholeness of the polis. The characters’ generalization of the polis as the primary site of well-ordered peace and war reflects anxieties about the polis’s finitude and about sources of disordering violence, notably Greek empires, Persia, and slave revolts. Second, Plato has his characters rehabilitate peace against

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Brink, David O., Susan Sauvé Meyer, and Shields Christopher, eds. Introduction. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198817277.003.0001.

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Through their writing, their teaching, their mentoring, and their broader scholarly output, Gail Fine and Terry Irwin have reshaped the character of ancient philosophy as an academic discipline. Their contributions to the discipline do not, however, end there. On the contrary, their wide-ranging achievements extend into all periods of the history of philosophy and indeed into several areas more systematic than historical. Or perhaps one should say, rather, that their work defies any ready classification as being either historical or systematic, because whatever its primary focus on a given occ

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Kaufmann, Liane, Karin Kucian, and Michael von Aster. Development of the numerical brain. Edited by Roi Cohen Kadosh and Ann Dowker. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199642342.013.008.

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This article focuses on typical trajectories of numerical cognition from infancy all the way through to adulthood (please note that atypical pathways of numerical cognition will be dealt in‘Brain Correlates of Numerical Disabilities’). Despite the fact that developmental imaging studies are still scarce to date there is converging evidence that (1) neural signatures of non-verbal number processing may be observed already in infants; and (2) developmental changes in neural responsivity are characterized by increasing functional specialization of number-relevant frontoparietal brain regions. It

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Buchteile zum Thema "Finite gain theory"

Solis, Cesar U., and Julio B. Clempner. "Finite-Time Sliding Mode Controller with State-Dependent Gain Parameter." In New Perspectives and Applications of Modern Control Theory, 317–33. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62464-8_13.

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Hedman, Shawn. "Finite model theory." In A First Course in Logic. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780198529804.003.0014.

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This final chapter unites ideas from both model theory and complexity theory. Finite model theory is the part of model theory that disregards infinite structures. Examples of finite structures naturally arise in computer science in the form of databases, models of computations, and graphs. Instead of satisfiability and validity, finite model theory considers the following finite versions of these properties. • A first-order sentence is finitely satisfiable if it has a finite model. • A first-order sentence is finitely valid if every finite structure is a model. Finite model theory developed separately from the “classical” model theory of previous chapters. Distinct methods and logics are used to analyze finite structures. In Section 10.1, we consider various finite-variable logics that serve as useful languages for finite model theory. We define variations of the pebble games introduced in Section 9.2 to analyze the expressive power of these logics. Pebble games are one of the few tools from classical model theory that is useful for investigating finite structures. In Section 10.2, it is shown that many of the theorems from Chapter 4 are no longer true when restricted to finite models. There is no analog for the Completeness and Compactness theorems in finite model theory. Moreover, we prove Trakhtenbrot’s theorem which states that the set of finitely valid first-order sentences is not recursively enumerable. Descriptive complexity is the subject of 10.3. This subject describes the complexity classes discussed in Chapter 7 in terms of the logics introduced in Chapter 9. We prove Fagin’s theorem relating the class NP to existentional second-order logic. We prove the Cook–Levin theorem as a consequence of Fagin’s Theorem. This theorem states that the Satisfiability Problem for Propositional Logic is NP-complete. We conclude this chapter (and this book) with a section describing the close connection between logic and the P = NP problem. In this section, we discuss appropriate logics for the study of finite models. First-order logic, since it describes each finite model up to isomorphism, is too strong. For this reason, we must weaken the logic. It may seem counter-intuitive that we should gain knowledge by weakening our language.

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Davidson, Michael. "Cleavings." In Invalid Modernism, 167–80. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198832812.003.0008.

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Using poems by Emily Dickinson and recent work in cultural and queer theory, this final chapter explores the fine line between “gain” and “loss” in disability studies. Using the author’s own experience of gradual hearing loss, the chapter argues that recent claims for the positive values of “deaf gain” through the use of American Sign Language have vaunted possibilities of cultural inclusiveness to the exclusion of affective realms of frustration, loss, and failure that are seldom acknowledged experiences of deaf and hard-of-hearing persons. While endorsing the general thrust of Deaf Gain and its implications for the larger context of disability, the chapter argues for a more critical understanding of loss in the politics of gain.

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Guirao, Fernando. "Finale." In The European Rescue of the Franco Regime, 1950-1975, 433–40. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198861232.003.0010.

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The Nine failed to establish an industrial free-trade area with Spain and thus to gain access to the Spanish market, the largest west European industrial market outside their direct influence. The decision of the Council of Ministers of the European Communities, in October 1975, to suspend FTA negotiations with Spain, without denouncing the 1970 Agreement, meant the ultimate success of the Spanish government’s politico-economic strategy, the last episode of the European rescue of the Franco regime. The EC Council decision might have been inevitable in terms of public opinion and democratic morality, but it meant to permit Madrid to retain full control over the country’s import policy while fully exploiting the export prospects offered by the 1970 Agreement. In the end, the decision was detrimental for the overall interests of all the parties involved, whether the Spanish population or Western Europe. The final section of this book invites economic historians to estimate the costs of the Spanish EEC policy concerning the inefficient allocation of resources, weak technological transfer, lesser accompanying investment, and limitations to total-factor-productivity increases. Political historians, in turn, should explore what specific interests explain, in each case, why, if official Spanish trade practices in export promotion and import restriction gave the Six every incentive to denounce the 1970 Agreement, apart from obvious political reasons, they did not do so. Finally, scholars dealing with Spanish EEC-membership negotiations should determine the extent at which the Community experience over the 1970 Agreement explains Community attitudes towards some Spanish demands after 1979.

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Izquierdo-Córdoba, Luis Miguel, João Maurício Rosário, and Darío Amaya Hurtado. "Hybrid Dynamic Modelling and Bioinspired Control Based on Central Pattern Generator of Biped Robotic Gait." In Advanced Robotics and Intelligent Automation in Manufacturing, 233–68. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1382-8.ch009.

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This chapter presents the theoretical foundations and methodology to develop a bioinspired hybrid control architecture for a biped robotic device that reproduces gait and human motor control strategies with the ability to adapt the trajectory to environmental conditions. The objective is to design robotic devices (such as exoskeletons), through the functional integration of hybrid dynamic system modeling (event-driven and continuous dynamics) with efficient and robust conventional control techniques and bioinspired control algorithms, with a near-natural human gait pattern. The human gait cycle is modeled as a hybrid dynamic using a finite state machine (FSM). The gait trajectories are to be generated in such a way that they will be capable of adapting to disturbances in the path followed by the robotic device; this will be achieved using a neuronal oscillator that simulates the behavior of a central pattern generator (CPG).

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Goyal, Mukta, and Chetna Gupta. "Intuitionistic Fuzzy Decision Making Towards Efficient Team Selection in Global Software Development." In Research Anthology on Agile Software, Software Development, and Testing, 1756–75. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-3702-5.ch084.

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For successful completion of any software project, an efficient team is needed. This task becomes more challenging when the project is to be completed under global software development umbrella. The manual selection of team members based on some expert judgment may lead to inappropriate selection. In reality, there are hundreds of employees in an organization and a single expert may be biased towards any member. Thus, there is a need to adopt methods which consider multiple selection criteria with multiple expert views for making appropriate selection. This article uses an intuitionistic fuzzy approach to handle uncertainty in the expert's decision in multicriteria group decision making process and ranking among the finite team members. An intuitionistic fuzzy Muirhead Mean (IFMM) is used to aggregate the intuitionistic criteria's. To gain confidence between criteria and expert score relationship, the Annova test is performed. The results are promising with p value as small as 0.02 and one-tail t-test score equals to 0.0000002.

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Xia, Xiang-Gen, Genyuan Wang, and Pingyi Fan. "Space-Time Modulated Codes for MIMO Channels with Memory." In Handbook on Advancements in Smart Antenna Technologies for Wireless Networks, 130–55. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-59904-988-5.ch007.

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Modulated codes (MC) are error correction codes (ECC) defined on the complex field and therefore can be naturally combined with an intersymbol interference (ISI) channel. It has been previously proved that for any finite tap ISI channel there exist MC with coding gain comparing to the uncoded AWGN channel. In this chapter, we first consider space-time MC for memory channels, such as multiple transmit and receive antenna systems with ISI. Similar to MC for single antenna systems, the space-time MC can be also naturally combined with a multiple antenna system with ISI, which provides the convenience of the study. Some lower bounds on the capacities C and the information rates Ii.i.d of the MC coded systems are presented. We also introduce an MC coded zero-forcing decision feedback equalizer (ZF-DFE) where the channel is assumed known at both the transmitter and the receiver. The optimal MC design based on the ZF-DFE are presented.

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Cobanoglu, Ozden. "The Incidence of Ovulation and Detection of Genes Associated with Ovulation and Twinning Rates in Livestock." In Bovine Science [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99936.

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Cattle is a monotocous species that generally produce only one offspring per conception. However, multiple ovulations are a naturally emerging reproductive phenomenon typically controlled by genetic structure and environmental factors. On the other hand, few genes or causative mutations might explain significant genetic variations between animals for the reproductive traits. Studies report different methods, including QTL analysis, fine mapping, GWAS, and MAS selection, to improve such traits due to their economic importance. The recent fine-mapping study, which narrows the genomic region, indeed, influencing multiple ovulation, gives positive signals that causative mutation controlling high ovulation rate may be identified shortly. In conclusion, identifying the major genes that considerably affect ovulation and twinning rates provides the opportunity to increase reproduction efficiency by improving genetic gain in livestock species.

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R., Maheswari, Pattabiraman Venkatasubbu, and A. Saleem Raja. "Gait Analysis Using Principal Component Analysis and Long Short Term Memory Models." In Structural and Functional Aspects of Biocomputing Systems for Data Processing, 79–97. IGI Global, 2023. http://dx.doi.org/10.4018/978-1-6684-6523-3.ch004.

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Human analysis and diagnosis have become attractive technology in many fields. Gait defines the style of movement and gait analysis is a study of human activity to inspect the style of movement and related factors used in the field of biometrics, observation, diagnosis of gait disease, treatment, rehabilitation, etc. This work aims in providing the benefit of analysis of gait with different sensors, ML models, and also LSTM recurrent neural network, using the latest trends. Placing the sensors at the proper location and measuring the values using 3D axes for these sensors provides very appropriate results. With proper fine-tuning of ML models and the LSTM recurrent neural network, it has been observed that every model has an accuracy of greater than 90%, concluding that LSTM performance is observed to be slightly higher than machine learning models. The models helped in diagnosing the disease in the foot (if there is injury in the foot) with high efficiency and accuracy. The key features are proven to be available and extracted to fit the LSTM RNN model and have a positive outcome.

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Rajendran, R., and K. Vivekanandan. "Exploring Relationship between Information Systems Strategic Orientation and Small Business Performance." In Electronic Business, 1764–79. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-056-1.ch110.

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Businesses invest in developing information systems resources to gain competitive advantages. Literature has demonstrated the requirement of strategic alignment in converting these competitive advantages into sustained superior business performance. The knowledge of information systems strategic orientation and its relationship with business performance will enable these businesses to fine tune their strategic information systems applications portfolio in achieving required strategic alignment. This study focuses on the information systems strategic orientation of small businesses and investigates its relationship with their perceived business performance. The organizational impact of adoption of the initial stages of electronic business development is also examined. The data were collected from small businesses on nine strategy areas, through mail survey. The result reveals three multifaceted dimensions of information systems strategic orientation. These dimensions of strategic orientation have significantly influenced their business performance. For the adopters of Web presence, all these three dimensions remain significant in explaining their business performance.

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Konferenzberichte zum Thema "Finite gain theory"

Centurelli, Francesco, Pietro Monsurro, and Alessandro Trifiletti. "An MDAC architecture with low sensitivity to finite opamp gain." In 2011 European Conference on Circuit Theory and Design (ECCTD). IEEE, 2011. http://dx.doi.org/10.1109/ecctd.2011.6043597.

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Yeliseyeva, N. P., S. L. Berdnik, V. A. Katrich, and M. V. Nesterenko. "Directive gain of horizontal impedance vibrator located over finite-size perfectly conducting screen." In 2015 XXth IEEE International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED). IEEE, 2015. http://dx.doi.org/10.1109/diped.2015.7324255.

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Yeilaghi-Tamijani, A., R. Mirzaeifar, A. R. Ohadi, and M. R. Eslami. "Vibration Control of FGM Plate With Piezoelectric Sensors and Actuators Using Higher Order Shear Deformation Theory." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95710.

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In this paper, finite element formulation for the active control of functionally graded material (FGM) plates containing piezoelectric sensor/actuator patches by using higher order shear deformation theory is carried out. The major difference to previous studies is the new feedback control algorithm for active control of FGM plate which is presented in this paper. The effects of the configuration of the S/A pairs and the velocity and displacement feedback control gains on the static and dynamic response of the structure are studied. Numerical results are presented for the static deflection, na

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Kee, Daniel De, and Ning Sun. "Prediction of Stress Jump and Elongational Viscosity via Network Theory." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1987.

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Abstract The network model, originally developed for rubber like materials and later extended to model liquids, is subject to modifications. In this work, we look at the adaptation for improved elongational viscosity predictions and to allow for stress jump predictions. A new formulation involving non-affine motion is proposed and its applications are presented. The major improvement is that a finite elongational viscosity is predicted for finite elongational rate, contrary to infinite elongational viscosities existing at some elongational rates predicted by most previous network models. Compa

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Chang, C. S., and Herbert U. Fluhler. "Implications of self-consistent QED to high voltage XUV free electron lasers." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.wt3.

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A self-consistent quantum electrodynamic (SCQED) theory of high voltage free electron lasers (FEL) is given. Spontaneous emission spectra and gain are predicted in the small signal gain regime and compared to FEL experimental data. The SCQED theory predicts line shift, spectral broadening, and gain reduction due to quantum mechanical effects which are not predicted by the classical/conventional FEL theories. Comparison with well accepted FEL experiments shows excellent agreement between the SCQED predictions and the data: much better than predicted by the classical/conventional FEL theories. C

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Masri, Karim M., Mohammad I. Younis, and Shuai Shao. "Investigation of a Delayed Feedback Controller of MEMS Resonators." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12045.

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Controlling mechanical systems is an important branch of mechanical engineering. Several techniques have been used to control Microelectromechanical systems (MEMS) resonators. In this paper, we study the effect of a delayed feedback controller on stabilizing MEMS resonators. A delayed feedback velocity controller is implemented through modifying the parallel plate electrostatic force used to excite the resonator into motion. A nonlinear single degree of freedom model is used to simulate the resonator response. Long time integration is used first. Then, a finite deference technique to capture p

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Naseradinmousavi, Peiman, C. Nataraj, and Matthew Frank. "Nonlinear Modeling and Analysis of Electromagnetic Bearings With Permanent Magnets for Bias." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71311.

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This article describes high fidelity modeling of electromagnetic (EM) bearings with permanent magnets (PM) used to supply bias current. We analyze both the PM and EM parts of the system. Magnetic circuit theory is first used to gain insight into the magnetic forces and allows for the dynamic analysis of a rigid rotor coupled with the magnetic bearings. The results reveal that the magnetic forces are a strong nonlinear function of the rotor offsets from its equilibrium position. Next, the validity of the simplifying assumptions is examined with the aid of the finite element method. Comparisons

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Patel, Jay, and Pedro Peralta. "Mechanisms for Kink Band Evolution in Polymer Matrix Composites: A Digital Image Correlation and Finite Element Study." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67482.

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Polymer matrix composites (PMCs) are attractive structural materials due to their high stiffness and low weight to strength ratio. However, unidirectional PMCs have low shear strength and failure can occur along kink bands that develop on compression due to plastic microbuckling that carry strains large enough to induce nonlinear matrix deformation. The study of kink band nucleation and evolution in unidirectional composites (UDCs) is an active area of research. In the last five decades, a large body of research has been done to understand kink band mechanisms using theory and experiments. How

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Kersken, Hans-Peter, Christian Frey, Christian Voigt, and Graham Ashcroft. "Time-Linearized and Time-Accurate 3D RANS Methods for Aeroelastic Analysis in Turbomachinery." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22940.

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A computational method for performing aeroelastic analysis using either a time-linearized or an unsteady time-accurate solver for the compressible Reynolds averaged Navier-Stokes (RANS) equations is described. The time-linearized solver employs the assumption of small time-harmonic perturbations and is implemented via finite differences of the nonlinear flux routines of the time-accurate solver. The resulting linear system is solved using a parallelized Generalized Minimal Residual (GMRES) method with block-local preconditioning. The time accurate solver uses a dual time stepping algorithm for

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Shirani, Farhad, and S. Sandeep Pradhan. "Finite block-length gains in distributed source coding." In 2014 IEEE International Symposium on Information Theory (ISIT). IEEE, 2014. http://dx.doi.org/10.1109/isit.2014.6875124.

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Berichte der Organisationen zum Thema "Finite gain theory"

Patel, Reena. Complex network analysis for early detection of failure mechanisms in resilient bio-structures. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/41042.

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Bio-structures owe their remarkable mechanical properties to their hierarchical geometrical arrangement as well as heterogeneous material properties. This dissertation presents an integrated, interdisciplinary approach that employs computational mechanics combined with flow network analysis to gain fundamental insights into the failure mechanisms of high performance, light-weight, structured composites by examining the stress flow patterns formed in the nascent stages of loading for the rostrum of the paddlefish. The data required for the flow network analysis was generated from the finite ele

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Riveros, Guillermo, Felipe Acosta, Reena Patel, and Wayne Hodo. Computational mechanics of the paddlefish rostrum. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/41860.

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Purpose – The rostrum of a paddlefish provides hydrodynamic stability during feeding process in addition to detect the food using receptors that are randomly distributed in the rostrum. The exterior tissue of the rostrum covers the cartilage that surrounds the bones forming interlocking star shaped bones. Design/methodology/approach – The aim of this work is to assess the mechanical behavior of four finite element models varying the type of formulation as follows: linear-reduced integration, linear-full integration, quadratic-reduced integration and quadratic-full integration. Also presented i

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Yahav, Shlomo, John Brake, and Orna Halevy. Pre-natal Epigenetic Adaptation to Improve Thermotolerance Acquisition and Performance of Fast-growing Meat-type Chickens. United States Department of Agriculture, September 2009. http://dx.doi.org/10.32747/2009.7592120.bard.

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: The necessity to improve broiler thermotolerance and performance led to the following hypothesis: (a) thethermoregulatory-response threshold for heat production can be altered by thermal manipulation (TM) during incubation so as to improve the acquisition of thermotolerance in the post-hatch broiler;and (b) TM during embryogenesis will improve myoblast proliferation during the embryonic and post-hatch periods with subsequent enhanced muscle growth and meat production. The original objectives of this study were as follow: 1. to assess the timing, temperature, duration, and turning frequency r

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