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Journal articles on the topic 'Fixed‐Point Toolbox'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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1

Chwastek, Krzysztof. "The applications of fixed-point theorem in optimisation problems." Archives of Electrical Engineering 61, no. 2 (2012): 189–98. http://dx.doi.org/10.2478/v10171-012-0016-0.

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The applications of fixed-point theorem in optimisation problems The fixed-point theorem is widely used in different engineering applications. The present paper focuses on its applications in optimisation. A Matlab toolbox, which implements the branch-and-bound optimisation method based on the fixed-point theorem, is used for solving different real-life test problems, including estimation of model parameters for the Jiles-Atherton model.
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2

Rao, Ruofeng, Zhilin Pu, Shouming Zhong, and Xinggui Li. "Fixed Points and Exponential Stability for Impulsive Time-Delays BAM Neural Networks via LMI Approach and Contraction Mapping Principle." Mathematical Problems in Engineering 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/3154683.

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The fixed point technique has been employed in the stability analysis of time-delays bidirectional associative memory (BAM) neural networks with impulse. By formulating a contraction mapping in a product space, a new LMI-based exponential stability criterion was derived. Lately, fixed point methods have educed various good results inspiring this work, but those criteria cannot be programmed by a computer. In this paper, LMI conditions of the obtained result can be applicable to computer Matlab LMI toolbox which meets the need of the large-scale calculation in real engineering. Moreover, a nume
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3

Rao, Ruofeng, and Zhilin Pu. "LMI-Based Stability Criterion of Impulsive T-S Fuzzy Dynamic Equations via Fixed Point Theory." Abstract and Applied Analysis 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/261353.

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By formulating a contraction mapping and the matrix exponential function, the authors apply linear matrix inequality (LMI) technique to investigate and obtain the LMI-based stability criterion of a class of time-delay Takagi-Sugeno (T-S) fuzzy differential equations. To the best of our knowledge, it is the first time to obtain the LMI-based stability criterion derived by a fixed point theory. It is worth mentioning that LMI methods have high efficiency and other advantages in largescale engineering calculations. And the feasibility of LMI-based stability criterion can efficiently be computed a
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4

Rao, Ruofeng, and Shouming Zhong. "Contraction Mapping Theory and Approach to LMI-Based Stability Criteria of T-S Fuzzy Impulsive Time-Delays Integrodifferential Equations." Journal of Function Spaces 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/5035618.

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In this paper, Banach fixed point theorem is employed to derive LMI-based exponential stability of impulsive Takagi-Sugeno (T-S) fuzzy integrodifferential equations, originated from Cohen-Grossberg Neural Networks (CGNNs). As far as we know, Banach fixed point theorem is rarely employed to derive LMI criteria for T-S fuzzy CGNNs, and this inspires our present work. It is worth mentioning that the conditions on the behavior functions are weaker than those of existing results, and the formulated contraction mapping and fixed point technique are different from those of previous literature. Even a
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5

Yuan, Jia, Yu Jiang Wang, Jing Hong Cui, et al. "MPPT Strategy of PV System Based on Adaptive Fuzzy Control." Advanced Materials Research 1008-1009 (August 2014): 63–67. http://dx.doi.org/10.4028/www.scientific.net/amr.1008-1009.63.

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In order to use photovoltaic cell effectively and improve its photoelectric conversion efficiency, the maximum power point of photovoltaic generation system should be tracked rapidly and stably [1]. Taking into account the solar PV systems are often affected by external factors,it is difficult to determine system parameters, and has a strong non-linear,so this paper,a adaptive fuzzy logic control technology for STP0950S-36 type of independent photovoltaic systems to a adaptive fuzzy controller design method, and using MATLAB/SIMULINK,fuzzy logic toolbox for simulation tools such as maximum pow
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6

Karami, Akbar, Saeid Abbasbandy, and Elyas Shivanian. "INverse problem of identifying a time-dependent coefficient and free boundary in heat conduction equation by using the meshless local Petrov-Galerkin (MLPG) method via moving least squares approximation." Filomat 34, no. 10 (2020): 3319–37. http://dx.doi.org/10.2298/fil2010319k.

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In this paper we investigated the inverse problem of identifying an unknown time-dependent coefficient and free boundary in heat conduction equation. By using the change of variable we reduced the free boundary problem into a fixed boundary problem. In direct solver problem we employed the meshless local Petrov-Galerkin (MLPG) method based on the moving least squares (MLS) approximation. Inverse reduced problem with fixed boundary is nonlinear and we formulated it as a nonlinear least-squares minimization of a scalar objective function. Minimization is performed by using of f mincon routine fr
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7

Lee, Jong Man, Won Hee Kang, and Kwang Ho Lee. "ANN Based Optimized AHU Discharge Air Temperature Control of Conventional VAV System for Minimized Cooling Energy in an Office Building." E3S Web of Conferences 111 (2019): 05014. http://dx.doi.org/10.1051/e3sconf/201911105014.

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In most conventional forced-air systems, the guidelines for the air handling unit(AHU) discharge air temperature(DAT) are not fully established and thus AHU DAT are constantly fixed to a particular set-point, regardless of dynamic changes of operating variables. In this circumstance, this study aimed at developing a control algorithm that can operate a conventional VAV system with optimal set-points for the AHU DAT. Three-story office building was modeled using co-simulation technique between EnergyPlus and Matlab via BCVTB(Building Controls Virtual Test Bed). In addition, artificial neural ne
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8

Li, Xian Feng, Xiao Peng Wang, Xin Da Qi, Yan Wang, and Ping Yu. "LABTM Control System Based on FPGA." Applied Mechanics and Materials 300-301 (February 2013): 1604–9. http://dx.doi.org/10.4028/www.scientific.net/amm.300-301.1604.

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This paper presents the digital PI control method for design and simulation of a high precision limited angle brushless torque motor control system in Field Programmable Gate Array device (FPGA). The direct drive structures which are widely applied in many servo control fields. Matlab Xilinx System Generator® toolbox based on Fixed-Point Arithmetic is used to design the digital PI controller using DSP architecture, plot the responses of the control system and generate the VHDL source code. The control system model consists of a digital PI, a real LABTM, and a real absolute Inductosyn, encoder
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9

Thong, Duong Viet, Aviv Gibali, Mathias Staudigl, and Phan Tu Vuong. "Computing Dynamic User Equilibrium on Large-Scale Networks Without Knowing Global Parameters." Networks and Spatial Economics 21, no. 3 (2021): 735–68. http://dx.doi.org/10.1007/s11067-021-09548-3.

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AbstractDynamic user equilibrium (DUE) is a Nash-like solution concept describing an equilibrium in dynamic traffic systems over a fixed planning period. DUE is a challenging class of equilibrium problems, connecting network loading models and notions of system equilibrium in one concise mathematical framework. Recently, Friesz and Han introduced an integrated framework for DUE computation on large-scale networks, featuring a basic fixed-point algorithm for the effective computation of DUE. In the same work, they present an open-source MATLAB toolbox which allows researchers to test and valida
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10

Baran, Janusz, and Andrzej Jąderko. "An MPPT Control of a PMSG-Based WECS with Disturbance Compensation and Wind Speed Estimation." Energies 13, no. 23 (2020): 6344. http://dx.doi.org/10.3390/en13236344.

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The paper presents simulation research on a variable structure control scheme of a small variable-speed fixed-pitch wind energy conversion system (WECS) with a three-phase permanent magnet synchronous generator (PMSG) in variable wind conditions. The WECS is connected to a power grid through two back-to-back voltage source converters (VSCs) with a DC link. The presented control algorithm is based on feedforward compensation of the wind turbine aerodynamic torque estimated using a linear disturbance observer (DOB). The torque estimate is employed to determine the effective wind speed, required
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11

Adon, Nur Atiqah, Fahanahani Mahmud, Mohamad Hairol Jabbar, and Norliza Othman. "Optimization in MATLAB for Cardiac Excitation Modeling towards FPGA Standalone Simulation Tools." Applied Mechanics and Materials 773-774 (July 2015): 761–65. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.761.

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In past few decades, most of the modern electrophysiological concepts and methods were developed by the computational technique extensively to compute the cardiac action potential in nerve cells. Thus, tissue models consisting of a large number of single cell models cause a problem in the amount of computation required to obtain meaningful results from simulations. One of the solutions to this problem is by implementing the simulation through hardware modeling using a Field Programmable Gate Array (FPGA). Here, a research on developing a real-time simulation tool responsible for reentrant exci
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12

Aurélio, David, and Jana Vejpravova. "Understanding Magnetization Dynamics of a Magnetic Nanoparticle with a Disordered Shell Using Micromagnetic Simulations." Nanomaterials 10, no. 6 (2020): 1149. http://dx.doi.org/10.3390/nano10061149.

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Spin disorder effects influence magnetization dynamics and equilibrium magnetic properties of real nanoparticles (NPs). In this work, we use micromagnetic simulations to try to better understand these effects, in particular, on how the magnetization reversal is projected in the character of the hysteresis loops at different temperatures. In our simulation study, we consider a prototype NP adopting a magnetic core-shell model, with magnetically coherent core and somewhat disordered shell, as it is one of the common spin architectures in real NPs. The size of the core is fixed to 5.5 nm in diame
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13

Golub, Matthew, and David Sussillo. "FixedPointFinder: A Tensorflow toolbox for identifying and characterizing fixed points in recurrent neural networks." Journal of Open Source Software 3, no. 31 (2018): 1003. http://dx.doi.org/10.21105/joss.01003.

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14

Liu, Guangqi, Qinghai Ding, Haibo Luo, et al. "A Novel Evolution Strategy of Level Set Method for the Segmentation of Overlapping Cervical Cells." Applied Sciences 11, no. 1 (2021): 443. http://dx.doi.org/10.3390/app11010443.

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Development of an accurate and automated algorithm to completely segment cervical cells in Pap images is still one of the most challenging tasks. The main reasons are the presence of overlapping cells and the lack of guiding mechanism for the convergence of ill-defined contours to the actual cytoplasm boundaries. In this paper, we propose a novel method to address these problems based on level set method (LSM). Firstly, we proposed a morphological scaling-based topology filter (MSTF) and derived a new mathematical toolbox about vector calculus for evolution of level set function (LSF). Secondl
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15

Tomczyk, Krzysztof. "Monte Carlo-Based Procedure for Determining the Maximum Energy at the Output of Accelerometers." Energies 13, no. 7 (2020): 1552. http://dx.doi.org/10.3390/en13071552.

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The solutions presented in this paper can be the basis for mutual comparison of different types of accelerometers produced by competing companies. An application of a procedure based on the Monte Carlo method to determine the maximum energy at the output of accelerometers is discussed here. The fixed-point algorithm controlled by the Monte Carlo method is used to determine this energy. This algorithm can only be used for the time-invariant and linear measurement systems. Hence, the accelerometer nonlinearities are not considered here. The mathematical models of the accelerometer and the specia
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16

Segers, Laurent, Jurgen Vandendriessche, Thibaut Vandervelden, et al. "CABE: A Cloud-Based Acoustic Beamforming Emulator for FPGA-Based Sound Source Localization." Sensors 19, no. 18 (2019): 3906. http://dx.doi.org/10.3390/s19183906.

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Microphone arrays are gaining in popularity thanks to the availability of low-cost microphones. Applications including sonar, binaural hearing aid devices, acoustic indoor localization techniques and speech recognition are proposed by several research groups and companies. In most of the available implementations, the microphones utilized are assumed to offer an ideal response in a given frequency domain. Several toolboxes and software can be used to obtain a theoretical response of a microphone array with a given beamforming algorithm. However, a tool facilitating the design of a microphone a
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17

"Fixed-point toolbox 2." Aircraft Engineering and Aerospace Technology 79, no. 5 (2007). http://dx.doi.org/10.1108/aeat.2007.12779ead.011.

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18

Gerwien, Aaron, Peter Mayer, and Henry Dube. "Green light powered molecular state motor enabling eight-shaped unidirectional rotation." Nature Communications 10, no. 1 (2019). http://dx.doi.org/10.1038/s41467-019-12463-4.

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Abstract Molecular motors convert external energy into directional motions at the nano-scales. To date unidirectional circular rotations and linear motions have been realized but more complex directional trajectories remain unexplored on the molecular level. In this work we present a molecular motor powered by green light allowing to produce an eight-shaped geometry change during its unidirectional rotation around the central molecular axis. Motor motion proceeds in four different steps, which alternate between light powered double bond isomerizations and thermal hula-twist isomerizations. The
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19

Kennedy, Ümit, and Emma Maguire. "The Texts and Subjects of Automediality." M/C Journal 21, no. 2 (2018). http://dx.doi.org/10.5204/mcj.1395.

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Being is an empty fiction. The “apparent” world is the only world: the “true world” is just a lie added on to it… —Nietzsche. Anna Poletti: I’m attracted to autobiography in a non-narrative context because I’m very interested in texts that people create that demonstrate their thinking or their fantasies or their processing, generally.Lauren Berlant: Right, in that sense it’s autobiography in your larger sense of what autobiography is: a record of […] processing. —Anna Poletti and Julie Rak with Lauren Berlant. The medium is the message. —Marshall McLuhanWelcome to the M/C Journal issue on auto
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