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Heat removal analysis on steel billets and slabs produced by continuous casting using numerical simulation

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2017年第5-8期93卷 1545-1565页

作者： Ramirez-Lopez, A. Munoz-Negron, D. Palomar-Pardave, M. Romero-Romo, M. A. Gonzalez-Trejo, J. ITAM Acad Dept Ind Engn Mexico City 01080 DF Mexico Univ Autonoma Metropolitana UAM Azcapotzalco Dept Mat Sci Mexico City 02200 DF Mexico

Simulation of a continuous casting process (CCP) is very important for improving industrial practices, reducing working times, and assuring safety operating conditions. The present work is focused on the development of a computational simulator to calculate and analyze heat removal during continuous casting of steel;routines for reading the geometrical configuration and operating conditions were developed for an easy management. Here, a finite difference method is used to solve the steel thermal behavior using a 2D computational array. Conduction, radiation, and forced convection equations are solved to simulate heat removal according to a steel position along the continuous casting machine. A graphical user interface (GUI) was also developed to display virtual sketches of the casting machines;moreover, computational facilities were programmed to show results such as temperature and solidification profiles. The results are analyzed and validated by comparison with industrial trials;finally, the influence of some industrial parameters such as casting speed and quenching conditions is analyzed to provide some recommendations in order to warrant safety operating conditions.

关键词： Continuous casting Steel manufacturing Heat removal Thermal behavior Computer simulation computational algorithms

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ToTCompute: A Novel EEG-Based TimeOnTask Threshold Computation Mechanism for Engagement Modelling and Monitoring

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INTERNATIONAL JOURNAL OF ARTIFICIAL INTELLIGENCE IN EDUCATION 2016年第3期26卷 821-854页

作者： Ghergulescu, Ioana Muntean, Cristina Hava Adaptemy 27 Lower Mt St Dublin 2 Ireland Natl Coll Ireland Sch Comp IFSC Mayor St Dublin 1 Ireland

Engagement influences participation, progression and retention in game-based e-learning (GBeL). Therefore, GBeL systems should engage the players in order to support them to maximize their learning outcomes, and provide the players with adequate feedback to maintain their motivation. Innovative engagement monitoring solutions based on players' behaviour are needed to enable engagement monitoring in a non-disturbing way, without interrupting the game-play and game flow. Furthermore, generic metrics and automatic mechanisms for their engagement monitoring and modelling are needed. One important metric that was used for engagement modelling is TimeOnTask, which represents the duration of time required by the player to complete a task. This paper proposes ToTCompute (TimeOnTask Threshold Computation), a novel mechanism that automatically computes - in a task-dependent manner - TimeOnTask threshold values after which student engagement decreases with a given percentage from his initial level of engagement (e.g., after 2 min student engagement will fall with 10 % from his initial level). In this way the mechanism enables engagement modelling at a higher granularity and further enables engagement-based adaptation in GBeL systems. ToTCompute makes use of game-playing information and EEG signals collected through an initial testing session. The results of an experimental case study have shown that ToTCompute can be used to automatically compute threshold values for the TimeOnTask generic engagement metric, which explains up to 76.2 % of the variance in engagement change. Furthermore, the results confirmed the usefulness of the mechanism as the TimeOnTask threshold value is highly task-dependent, and setting its value manually for multiple game tasks would be a laborious process.

关键词： Engagement Modelling Monitoring Game-based e-learning Motivation Player behaviour EEG computational algorithms Time-on-task Time series analysis

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algorithms at Work: Empirical Diversity, Analytic Vocabularies, Design Implications 19

Algorithms at Work: Empirical Diversity, Analytic Vocabulari...

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19th ACM Conference on Computer-Supported Cooperative Work and Social Computing (CSCW)

作者： Wagenknecht, Susann O'Neill, Jacki Lee, Min Kyung Zade, Himanshu Lustig, Caitlin Univ Siegen Dept Social Sci Siegen Germany Microsoft Res India MSRI Technol Emerging Markets Bengaluru Karnataka India Carnegie Mellon Univ Ctr Machine Learning & Hlth Pittsburgh PA 15213 USA Univ Calif Irvine Dept Informat Irvine CA 92717 USA

ISBN: (纸本)9781450339506

computational algorithms have recently emerged as the subject of fervent public and academic debates. What animates many of these debates is a perceived lack of clarity as to what algorithms actually are, what precisely they do, and which human-technology-relations their application may bring about. Therefore, this CSCW workshop critically discusses computational algorithms and the diverse ways in which humans relate to them-focusing particularly upon work practices and investigating how algorithms facilitate, regulate, and require human labor, as well as how humans make sense of and react to them. The purpose of this workshop is threefold: first, to chart the diversity of algorithmic technologies as well as their application, appropriation, use and presence in work practices;second, to probe analytic vocabularies that account for empirical diversity;third, to discuss implications for design that come out of our understandings of algorithms and the technologies through which they are enacted.

关键词： computational algorithms work practices algorithmic management work technologies

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Contributions to the Design of a Water Pumped Storage System in an Isolated Power System with High Penetration of Wind Energy 7th

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7th IFIP WG 5.5/SOCOLNET Advanced Doctoral Conference on Computing, Electrical and Industrial Systems (DoCEIS)

作者： Lopes, Antonio Setas Castro, Rui Silva, Carlos Univ Lisbon IST Lisbon Portugal Univ Lisbon INESC ID IST Lisbon Portugal Univ Lisbon IN IST Lisbon Portugal

ISBN: (纸本)9783319311654;9783319311647

The increasing penetration of renewable energies in the electrical systems, particularly in small and isolated systems, like the case studied in this paper, Terceira Island in Azores, Portugal, creates challenges in the dispatch related to the variability and the difficulty to forecast the renewable resources. One way to deal with such issues is to use Water Pumping Storage Systems (WPSS) to regulate the system electricity production by storing energy surplus in low load periods and returning it back in high load periods, reducing at the same time the need to curtail wind. This paper describes and compares a deterministic and a metaheuristic methodology, using Particle Swarm Optimization (PSO), used to determine the best configuration of the WPSS in terms of number and unit power of pumps and turbines, and upper and lower reservoir capacity that lead to the best economic value, determined by the Net Present Value (NPV) of the investment.

关键词： Renewables integration Water Pumped Storage Systems (WPSS) Particle Swarm Optimization (PSO) computational algorithms Cyber-Physical Systems

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algorithms for the theory of restrictions of scalar -D systems to proper subspaces of Rⁿ

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MULTIDIMENSIONAL SYSTEMS AND SIGNAL PROCESSING 2015年第2期26卷 439-457页

作者： Pal, Debasattam Pillai, Harish K. Indian Inst Technol Guwahati Dept Elect & Elect Engn North Guwahati 781039 India Indian Inst Technol Dept Elect Engn Bombay 400076 Maharashtra India

In this paper, we study the restrictions of solutions of a scalar system of PDEs to a proper subspace of the domain . The object of study is associated with certain intersection ideals. In the paper, we provide explicit algorithms to calculate these intersection ideals. We next deal with when a given subspace is "free" with respect to the solution set of a system of PDEs-this notion of freeness is related to restrictions and intersection ideals. We again provide algorithms and checkable algebraic criterion to answer the question of freeness of a subspace. Finally, we provide an upper bound to the dimension of free subspaces that can be associated with the solution set of a system of PDEs.

关键词： Systems of PDEs Restriction ideals computational algorithms

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Frontiers of Mechanical Engineering and Materials Engineering III 1

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丛书名： Applied Mechanics and Materials

2015年

作者： edited by Wen-Pei Sung and Jimmy (C.M.) Kao.

ISBN: (数字)9783038267768

ISBN: (纸本)9783038353904

Collection of selected, peer reviewed papers from the 2014 3rd international conference on frontiers of mechanical engineering and materials engineering (meme 2014), november 21-23, 2014, xiamen, china. The 227 papers are grouped as follows: chapter 1: materials, technologies for processing and chemical engineering; chapter 2: researching and designing of machines and technological equipment; chapter 3: measurements, mechatronics, control and automation; chapter 4: communication, information technologies and computational algorithms.

关键词： Automation Chemical Engineering Communication computational algorithms Control Designing of Machines Information Technologies Materials Processing Materials Science Measurements Mechatronics Technological Equipment

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NASA computational Case Study: Where Is My Moon?

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COMPUTING IN SCIENCE & ENGINEERING 2014年第6期16卷 92-99页

作者： Memarsadeghi, Nargess McFadden, Lucy NASA Goddard Space Flight Ctr Sci Data Syst Branch Washington DC 20546 USA NASA Goddard Space Flight Ctr Planetary Syst Lab Washington DC USA

A moon or natural satellite is a celestial body that orbits a planet, dwarf planet, or an asteroid. Several reasons motivate discovering and studying moons of planetary bodies. Here, we learn how astronomers search for moons of planetary bodies or perform satellite search. In particular, we look for moons of Pluto using Hubble Space Telescope's data.

关键词： Moon astronomy computing Hubble Space Telescope NASA Pluto Web extra image files natural satellite planetary bodies Filters Mars Moon NASA Noise reduction Orbits Satellite communication Scientific computing Space vehicles Telescopes Dawn mission Hubble Space Telescope NASA science application Pluto asteroid Vesta astronomy computational algorithms denoising filtering image registration planetary sciences resistant mean satellite search scientific computing

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Using Soft Potentials for the Simulation of Block Copolymer Morphologies

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MACROMOLECULAR THEORY AND SIMULATIONS 2014年第6期23卷 401-409页

作者： Parker, Amanda J. Rottler, Joerg Univ British Columbia Dept Phys & Astron Vancouver BC V6T 1Z4 Canada

A simulation strategy for the creation of equilibrated nanostructured copolymer melt morphologies is proposed. Molecular dynamics simulations of bead-spring chains with a soft pair potential are used for efficient modeling of phase separation, while preserving Gaussian chain statistics and chain conformations of an underlying microscopic model. In a second step, hard excluded volume interactions are reintroduced that match the copolymer segregation strength but only require reequilibration of local packing structure. We show that substantial computational gains can be achieved for equilibrating moderately entangled bead-spring polymers. The resultant configurations can be used for further studies of structural and mechanical properties in melts or glasses.

关键词： block copolymers coarse-graining computational algorithms molecular dynamics multiscale simulation

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Fast and robust computation of Cartesian derivatives of Zernike polynomials

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OPTICS AND LASERS IN ENGINEERING 2014年第Jan.期52卷 7-12页

作者： Novak, Pavel Novak, Jiri Miks, Antonin Czech Tech Univ Fac Civil Engn Dept Phys Prague 16629 Czech Republic

This work deals with a problem of an effective and robust evaluation of Cartesian partial derivatives of Zernike polynomials. Calculations based on explicit relations suffer from high computational costs and are numerically instable for higher orders. Thus, fast and numerically stable methods for calculation of derivatives of Zernike polynomials are needed. Such methods employing recursive techniques based on the relation of Zernike radial polynomials to Jacobi polynomials are proposed. The performance of proposed algorithms is compared to the standard calculation using explicit relations. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： Zernike polynomials derivatives computational algorithms Recurrence relations

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algorithms for computing Minkowski operators and their application in differential games

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computational MATHEMATICS AND MATHEMATICAL PHYSICS 2014年第2期54卷 235-264页

作者： Dvurechensky, P. E. Ivanov, G. E. State Univ Moscow Inst Phys & Technol Dolgoprudnyi 141700 Moscow Oblast Russia

The Minkowski operators are considered, which extend the concepts of the Minkowski sum and difference to the case where one of the summands depends on an element of the other term. The properties of these operators are examined. Convolution methods of computer geometry and algorithms for computing the values of the Minkowski operators are developed. These algorithms are used to construct epsilon-optimal control strategies in a nonlinear differential game with a nonconvex target set. The errors of the proposed algorithms are estimated in detail. Numerical results for the conflicting control of a nonlinear pendulum are presented.

关键词： Minkowski sum and difference Minkowski operator differential game optimal control strategy computational algorithms errors of algorithms

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