We provide a generalization of the algorithm of Eklund, Jost and Peterson for computing Segre classes of closed subschemes of projective -space. The algorithm is here generalized to computing the Segre classes of clos...
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We provide a generalization of the algorithm of Eklund, Jost and Peterson for computing Segre classes of closed subschemes of projective -space. The algorithm is here generalized to computing the Segre classes of closed subschemes of smooth projective toric varieties.
In the present paper, we consider a method for improving the computational algorithm for finding the factorials of integers;this method linearly accelerates the computations. We also present several algorithms effecti...
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In the present paper, we consider a method for improving the computational algorithm for finding the factorials of integers;this method linearly accelerates the computations. We also present several algorithms effectively realizing this method and analyze their complexity.
The electrification in remote islands whose electricity distribution network is not connected to the mainland's grid is mostly based on Autonomous Power Stations (APSs) that are usually characterized by a consider...
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The electrification in remote islands whose electricity distribution network is not connected to the mainland's grid is mostly based on Autonomous Power Stations (APSs) that are usually characterized by a considerably high electricity production cost, while at the same time the contribution of Renewable Energy Sources (RES) in these regions accounts for less than 10% of the total electricity generation. This actually results from the fact that despite the excellent wind potential of most of these islands, the wind energy contribution is significantly restricted from limits imposed to protect the remote electrical grids from possible instability problems, due to the stochastic wind speed behavior and the variable electricity consumption. On the basis of probability distribution of the load demand of a representative Greek island and the corresponding data related to the available wind potential, the present study estimates the maximum - acceptable by the local grid - wind energy contribution. For that reason, an integrated computational algorithm has been developed from first principles, based on a stochastic analysis. According to the results obtained, it becomes evident that with the current wind turbine technology, wind energy cannot play a key role in coping with the electrification problems encountered in many Greek island regions, excluding however the case of introducing bulk energy storage systems that may provide considerable recovery of the remarkable wind energy rejections expected. (C) 2011 Elsevier Ltd. All rights reserved.
The inverse problem related to restoration of boundary conditions in the boundary statement for the equations of two-phase flow in oil pool is considered. The difference analog of the problem is constructed using the ...
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The inverse problem related to restoration of boundary conditions in the boundary statement for the equations of two-phase flow in oil pool is considered. The difference analog of the problem is constructed using the method "implicit by the pressure - explicit by the saturation" and computational algorithm of solving the obtained system of difference equations is presented.
In our daily life, often we use forecasting techniques to predict weather, economy, population growth, stock, etc. In recent years, many fuzzy time series methods are developed for forecasting of enrollments of Univer...
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In our daily life, often we use forecasting techniques to predict weather, economy, population growth, stock, etc. In recent years, many fuzzy time series methods are developed for forecasting of enrollments of Universities. Song and Chissom (1993) were the pioneers in studying such type of problems. Shiva Raj Sing (2007) presented a simple time variant method for forecasting the enrollment of the University of Alabama using fuzzy time series. Forecasts are needed only if there is uncertainty about the future. In this paper develop the modified algorithm to forecast enrollment for the same data set and compared with existing methods. The proposed method shows the better forecasting accuracy rate for enrollments, compared than other methods.
The effect of deformation characteristics of the carbide phase and cobalt binder on the strength and plasticity of the WC-Co hard alloy has been studied using a calculation algorithm.
The effect of deformation characteristics of the carbide phase and cobalt binder on the strength and plasticity of the WC-Co hard alloy has been studied using a calculation algorithm.
The partial least squares procedure was originally developed to estimate the slope parameter in multivariate parametric models. More recently it has gained popularity in the functional data literature. There, the part...
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The partial least squares procedure was originally developed to estimate the slope parameter in multivariate parametric models. More recently it has gained popularity in the functional data literature. There, the partial least squares estimator of slope is either used to construct linear predictive models, or as a tool to project the data onto a one-dimensional quantity that is employed for further statistical analysis. Although the partial least squares approach is often viewed as an attractive alternative to projections onto the principal component basis, its properties are less well known than those of the latter, mainly because of its iterative nature. We develop an explicit formulation of Partial least squares for functional data, which leads to insightful results and Motivates new theory, demonstrating consistency and establishing convergence rates.
Este trabalho propõe a utilização da técnica de modelagem para obtenção das equações do movimento de sistemas dinâmicos, apresentando uma contribuição para o dese...
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Este trabalho propõe a utilização da técnica de modelagem para obtenção das equações do movimento de sistemas dinâmicos, apresentando uma contribuição para o desenvolvimento do algoritmo computacional e implementado através da técnica de grafos de ligação. O objetivo é entender o desempenho do algoritmo desenvolvido através dos grafos de ligações e, assim, avaliar e validar as propostas deste trabalho. O problema da busca para obter uma equação do modelo de sistemas dinâmicos com geração automática em plantas industriais tem levantado a necessidade de desenvolver um algoritmo para sistemas que forneça a equação do movimento do modelo dinâmico. A proposição desta Tese consiste na aplicação da técnica de grafos de ligação para a determinação das equações de estado a partir do algoritmo desenvolvido com um programa computacional para geração automática das equações do movimento na forma de equações de estado. Os algoritmos foram desenvolvidos em ambiente matemático simbólico. Alguns estudos de caso (aplicações) foram utilizados para validação do algoritmo, constituindo estudo de casos sistemáticos, sendo: -Sistema dinâmico viga-bola, sistema mecânico massa-mola-amortecedor e seu análogo o circuito RLC e sistema servo-válvula eletro-hidráulica. No primeiro caso, sistema dinâmico viga-bola (sistema não-linear), o sistema compreende de uma viga fixada ao eixo do motor e uma bola deslizando sobre a viga, onde foi obtida a modelagem via grafos de ligação, utilizando o algoritmo computacional e encontrado o modelo na forma de equação de estado. No segundo caso, sistema mecânico massa-mola-amortecedor e seu análogo circuito RLC, foi obtido o grafo...This work proposes the use of the technique of modeling for getting the equations of the movement of dynamic linear and non-linear systems, presenting a contribution for the development of the computational algorithm and implemented through the technique of bond graphs. The objective is the understanding of the performance of the
computational simulation is a very powerful tool to analyze industrial processes to reduce operating risks and improve profits from equipment. The present work describes the development of some computational algorithm...
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computational simulation is a very powerful tool to analyze industrial processes to reduce operating risks and improve profits from equipment. The present work describes the development of some computational algorithms based on the numerical method to create a simulator for the continuous casting process, which is the most popular method to produce steel products for metallurgical industries. The kinematics of industrial processing was computationally reproduced using subroutines logically programmed. The cast steel by each strand was calculated using an iterative method nested in the main loop. The process was repeated at each time step （？t） to calculate the casting time, simultaneously, the steel billets produced were counted and stored. The subroutines were used for creating a computational representation of a continuous casting plant （CCP） and displaying the simulation of the steel displacement through the CCP. These algorithms have been developed to create a simulator using the programming language C＋＋. algorithms for computer animation of the continuous casting process were created using a graphical user interface （GUI）. Finally, the simulator functionality was shown and validated by comparing with the industrial information of the steel production of three casters.
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