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Relevant bibliographies by topics / Computer-based assessments and input of mathematical expressions

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Academic literature on the topic 'Computer-based assessments and input of mathematical expressions'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Computer-based assessments and input of mathematical expressions"

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Liu, Jen-Yu, and Hong-Sen Yan. "Surface Geometry of Variable Pitch Cylindrical Cams with Conical Meshing Elements." Journal of Mechanical Design 116, no. 3 (1994): 862–66. http://dx.doi.org/10.1115/1.2919461.

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This paper presents mathematical expressions for the surface geometry of variable pitch cylindrical cams with four conical meshing elements based on the theory of conjugate surfaces. The unit normal of the element is derived, with given surface geometry of the meshing element, by differential geometry. The contact lines of the conjugate surface are defined according to the equation of meshing and the specified input-output relation. By the coordinate transformation of contact lines, we have the complete profile of the variable pitch cylindrical cam. The results of this work are instrumental in

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Mathew, Tittu Varghese, Lars Beex, Stéphane PA Bordas, and Sundararajan Natarajan. "A Stochastic Galerkin Cell-based Smoothed Finite Element Method (SGCS–FEM)." International Journal of Computational Methods 17, no. 08 (2019): 1950054. http://dx.doi.org/10.1142/s0219876219500543.

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In this paper, the cell-based smoothed finite element method is extended to solve stochastic partial differential equations with uncertain input parameters. The spatial field of Young’s Modulus and the corresponding stochastic results are represented by Karhunen-Loéve expansion and polynomial chaos expansion, respectively. Young’s Modulus of structure is considered to be random for stochastic static as well as free vibration problems. Mathematical expressions and the solution procedure are articulated in detail to evaluate the statistical characteristics of responses in terms of the static dis

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Liu, Xin, Yan Liu, and Zengshou Dong. "An ENOB Evaluation Method for an Acquisition Channel." Journal of Circuits, Systems and Computers 28, no. 11 (2019): 1950185. http://dx.doi.org/10.1142/s0218126619501858.

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Three-parameter and four-parameter sine-wave fitting algorithms are powerful tools for estimating the parameters of the excited single-tone sine-wave for ADC. In the dynamic performance testing processes of instruments, the angle frequency, amplitude, phase and dc component of the input sine-wave are all unknown, so the fitting procedure is nonlinear. This paper proposes and analyzes a test method based on iteration Interpolated Discrete Fourier Transform (IpDFT) and sine-wave fitting method for evaluating the effective number of bit (ENOB) of the acquisition channel. Mathematical expressions

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Zeng, Xiaoqin, and Daniel S. Yeung. "A Quantified Sensitivity Measure for Multilayer Perceptron to Input Perturbation." Neural Computation 15, no. 1 (2003): 183–212. http://dx.doi.org/10.1162/089976603321043757.

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The sensitivity of a neural network's output to its input perturbation is an important issue with both theoretical and practical values. In this article, we propose an approach to quantify the sensitivity of the most popular and general feedforward network: multilayer perceptron (MLP). The sensitivity measure is defined as the mathematical expectation of output deviation due to expected input deviation with respect to overall input patterns in a continuous interval. Based on the structural characteristics of the MLP, a bottom-up approach is adopted. A single neuron is considered first, and alg

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Guimapi, Ritter A., Samira A. Mohamed, Lisa Biber-Freudenberger, et al. "Decision Support System for Fitting and Mapping Nonlinear Functions with Application to Insect Pest Management in the Biological Control Context." Algorithms 13, no. 4 (2020): 104. http://dx.doi.org/10.3390/a13040104.

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The process of moving from experimental data to modeling and characterizing the dynamics and interactions in natural processes is a challenging task. This paper proposes an interactive platform for fitting data derived from experiments to mathematical expressions and carrying out spatial visualization. The platform is designed using a component-based software architectural approach, implemented in R and the Java programming languages. It uses experimental data as input for model fitting, then applies the obtained model at the landscape level via a spatial temperature grid data to yield regiona

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Dobychina, Elena, and Mikhail Snastin. "Dynamic Correction of the Influence of Long Measuring Path Irregularity in Antenna Tests." Applied Sciences 11, no. 17 (2021): 8183. http://dx.doi.org/10.3390/app11178183.

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This article investigates the influence of random microwave discontinuities on the characteristics of long transmission paths. This is most important for dynamic measuring stands, accompanied by multiple space movement of long transmission paths with their bending or twisting during the measurement process. In modern active electronically scanned arrays this issue also becomes relevant, due to increased requirements for the accuracy of beam shaping. The aim of this study is to develop a theoretical background and perform experimental verification for taking into account the effect of random mi

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Shah, Muhammad Izhar, Wesam Salah Alaloul, Abdulaziz Alqahtani, Ali Aldrees, Muhammad Ali Musarat, and Muhammad Faisal Javed. "Predictive Modeling Approach for Surface Water Quality: Development and Comparison of Machine Learning Models." Sustainability 13, no. 14 (2021): 7515. http://dx.doi.org/10.3390/su13147515.

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Water pollution is an increasing global issue that societies are facing and is threating human health, ecosystem functions and agriculture production. The distinguished features of artificial intelligence (AI) based modeling can deliver a deep insight pertaining to rising water quality concerns. The current study investigates the predictive performance of gene expression programming (GEP), artificial neural network (ANN) and linear regression model (LRM) for modeling monthly total dissolved solids (TDS) and specific conductivity (EC) in the upper Indus River at two outlet stations. In total, 3

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Bonifaz, E. A. "A New Thermal Model in SAE-AISI 1524 Friction Stir Welding." Defect and Diffusion Forum 390 (January 2019): 53–63. http://dx.doi.org/10.4028/www.scientific.net/ddf.390.53.

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Several important key problems and issues remain to be addressed about the numerical analysis of friction stir welding. The main feature of the thermal numerical approach is to accurately compute the thermal distribution produced by the friction between the plate and the tool. It is well known that the downward force applied from the tool creates a distributed pressure between the shoulder and the workpiece. Based on this, a new expression to represent the heat generation in FSW is proposed. Results of thermal cycles, thermal histories, and shapes of the weld and HAZ obtained with the proposed

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Henao-Bravo, Elkin Edilberto, Carlos Andrés Ramos-Paja, Andrés Julián Saavedra-Montes, Daniel González-Montoya, and Julián Sierra-Pérez. "Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain." Energies 13, no. 7 (2020): 1711. http://dx.doi.org/10.3390/en13071711.

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In this paper, a design method for a photovoltaic system based on a dual active bridge converter and a photovoltaic module is proposed. The method is supported by analytical results and theoretical predictions, which are confirmed with circuital simulations. The analytical development, the theoretical predictions, and the validation through circuital simulations, are the main contributions of the paper. The dual active bridge converter is selected due to its high efficiency, high input and output voltages range, and high voltage-conversion ratio, which enables the interface of low-voltage phot

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Begum, K. Ghousiya. "Performance assessment of controller designed for electrical systems with second order dynamics." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 39, no. 6 (2020): 1345–62. http://dx.doi.org/10.1108/compel-05-2020-0175.

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Purpose An assessment technique that analyzes the servo and regulatory characteristics of the proportional integral derivative controller is designed for time-delayed second-order stable processes. Design/methodology/approach The minimum theoretical error expression for integral of the absolute errors (IAE_o) is obtained from the preferred servo and regulatory transfer functions dependent on the step changes in reference and load variables. Findings The error-based index is outlined to estimate the controller that is derived using internal model-based control or direct synthesis method. The ra

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Dissertations / Theses on the topic "Computer-based assessments and input of mathematical expressions"

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Green, Andreas. "Inmatning av matematiska uttryck i en digital miljö." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93293.

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Inom matematikämnet har e-bedömningar, aktiviteter där digitala tekniker används för att bedöma studenters kunskaper, inte utvecklats i samma takt som e-bedömningar inom andra områden. Detta beror sannolikt på det stora inslag av symboler och icke-standardiserade tecken som karakteriserar matematiskt språk och särskiljer det från traditionellt skriftspråk. Ett problem som har noterats i samband med e-bedömningar inom matematik är att inmatningen av matematiska uttryck i ett digitalt system i många fall varit långsam och svår att begripa. Den här rapporten syftar till att undersöka tre kategori

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