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Search Results: 1 - 10 of 21377 matches for " method "
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Algorithmic Methods for Concave Optimization Problems  [PDF]
Xu Zhang, Xue Tian, Chen Wang, Tao Li
American Journal of Industrial and Business Management (AJIBM) , 2017, DOI: 10.4236/ajibm.2017.77067
Abstract: In this thesis, we reformulate the original non-linear model for the LMRP. Firstly, we introduced a set of parameters to represent the non-linear part of the cost increase for a facility space allocated potential additional costs and new set of decision variables, indicating how many customers each equipment distribution. The algorithms are tested on problems with 5 to 500 potential facilities and randomly generated locations. Then using actual data to validate this new method is better. Our work was motivated by the modeling approach used in the Maximum Expected Covering Location Problem (MEXCLP). We compare new method and Lagrangian relaxation method to solve LMRP with constant customer demand rate and equal standard deviation of daily demand.
Knowledge and practice of periodic abstinence among women in India  [PDF]
Begum Shahina, Dwivedi Sada Nand, Mittal Suneeta, Pandey Arvind
Open Journal of Preventive Medicine (OJPM) , 2013, DOI: 10.4236/ojpm.2013.34045
Abstract:

The use of contraceptive method to avoid pregnancy is a multifaceted phenomenon. Worldwide, 20 percent of married women of reproductive age are currently using periodic abstinence. To assess the knowledge and practice of periodic abstinence among currently married pregnant women, data were collected from the pregnant women attending the Department of Obstetrics and Gynaecology, All India Institute of Medical Sciences, New Delhi, India. One thousand three hundred and thirty one (1331) currently married pregnant women were interviewed face-to-face. Approximately 29.3 percent of women were aware of the abstinence method, 11.5 percent women had history of using it. In-depth finding shows that 84.9 percent women did not have correct knowledge of fertile window of a menstrual cycle. Counseling about the correct fertile window of a menstrual cycle may increase the effectiveness of methods and hence reduce the incidence of unwanted pregnancies.



A Comparative Study of Two Spatial Discretization Schemes for Advection Equation  [PDF]
Huda O. Bakodah
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2016, DOI: 10.4236/ijmnta.2016.51006
Abstract: In this paper, we describe a comparison of two spatial discretization schemes for the advection equation, namely the first finite difference method and the method of lines. The stability of the methods has been studied by Von Neumann method and with the matrix analysis. The methods are applied to a number of test problems to compare the accuracy and computational efficiency. We show that both discretization techniques approximate correctly solution of advection equation and compare their accuracy and performance.
Simpson’s Method for Solution of Nonlinear Equation  [PDF]
Hamideh Eskandari
Applied Mathematics (AM) , 2017, DOI: 10.4236/am.2017.87073
Abstract: The programs offered for solving nonlinear equations, usually the old method, such as alpha, chordal movement, Newton, etc. have been used. Among these methods may Newton’s method of them all be better and higher integration. In this paper, we propose the integration method for finding the roots of nonlinear equation we use. In this way, Newton’s method uses integration methods to obtain. In previous work, [1] and [2] presented numerical integration methods such as integration, trapezoidal and rectangular integration method that are used. The new method proposed here, uses Simpson’s integration. With this method, the approximation error is reduced. The calculated results show that this hypothesis is confirmed.
The Numerical Solution of the MRLW Equation Using the Multigrid Method  [PDF]
Yasser Mohamed Abo Essa, Ibrahim Abouefarag, El-Desouky Rahmo
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.521310
Abstract: In this paper, we obtained the numerical solutions of the modified regularized long-wave (MRLW) equation\"\", by using the multigrid method and finite difference method. The solitary wave motion, interaction of two and three solitary waves, and development of the Maxwellian initial condition into solitary waves are studied using the proposed method. The numerical solutions are compared with the known analytical solutions. Using\"\"error norms and conservative properties of mass, momentum and energy, accuracy and efficiency of the mentioned method will be established through comparison with other techniques.
FDTD Modeling of Lorentzian DNG Metamaterials by Auxiliary Differential Equation Method  [PDF]
Chiranjib Goswami, Saptarshi Mukherjee, Subrata Karmakar, Manimala Pal, Rowdra Ghatak
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2014, DOI: 10.4236/jemaa.2014.65010
Abstract:

In this paper, Finite Difference Time Domain (FDTD) is utilized to simulate metamaterials of Double Negative (DNG) origin that refers to those materials having simultaneous negative permittivity and permeability. The problem regarding space formulation is achieved by means of auxiliary differential equation method (ADE), which is easy, reliable and also causal process in nature thus making it proficient. It uses fair approximations to explicate the model. Mur’s boundary condition is used for 1-D problem space and convolution perfectly matched layer boundary is implemented for 2-D problem space. The properties of metamaterial conform their speculations of energy absorption, enhancement and backward propagation property with the aid of graphs engineered by Matlab simulation both in 1-D and 2-D. Also, the interaction of fields on DNG and Double Positive (DPS) layers is contrasted. The results achieved elucidate the validity and effectiveness of the ADE method and the Convolution Perfectly Match Layer (CPML) in designing DNG metamaterials.

Multigrid Method for the Numerical Solution of the Modified Equal Width Wave Equation  [PDF]
Yasser M. Abo Essa
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.710102
Abstract: Numerical solutions of the modified equal width wave equation are obtained by using the multigrid method and finite difference method. The motion of a single solitary wave, interaction of two solitary waves and development of the Maxwellian initial condition into solitary waves are studied using the proposed method. The numerical solutions are compared with the known analytical solutions. Using error norms and conservative properties of mass, momentum and energy, accuracy and efficiency of the mentioned method will be established through comparison with other methods.
Prediction of Rural Residents’ Consumption Expenditure Based on Lasso and Adaptive Lasso Methods  [PDF]
Xiaoting Tao, Haomin Zhang
Open Journal of Statistics (OJS) , 2016, DOI: 10.4236/ojs.2016.66094
Abstract: When the variable of model is large, the Lasso method and the Adaptive Lasso method can effectively select variables. This paper prediction the rural residents’ consumption expenditure in China, based on respectively using the Lasso method and the Adaptive Lasso method. The results showed that both can effectively and accurately choose the appropriate variable, but the Adaptive Lasso method is better than the Lasso method in prediction accuracy and prediction error. It shows that in variable selection and parameter estimation, Adaptive Lasso method is better than the Lasso method.
The Pivot Adaptive Method for Solving Linear Programming Problems  [PDF]
Saliha Belahcene, Philippe Marthon, Mohamed Aidene
American Journal of Operations Research (AJOR) , 2018, DOI: 10.4236/ajor.2018.82008
Abstract: A new variant of the Adaptive Method (AM) of Gabasov is presented, to minimize the computation time. Unlike the original method and its some variants, we need not to compute the inverse of the basic matrix at each iteration, or to solve the linear systems with the basic matrix. In fact, to compute the new support feasible solution, the simplex pivoting rule is used by introducing a matrix that we will define. This variant is called “the Pivot Adaptive Method” (PAM); it allows presenting the resolution of a given problem under the shape of successive tables as we will see in example. The proofs that are not given by Gabasov will also be presented here, namely the proofs for the theorem of the optimality criterion and for the theorem of existence of an optimal support, and at the end, a brief comparison between our method and the Simplex Method will be given.
The Method of Recognizing International Law  [PDF]
Alireza Azadikalkoshki, Mohsen Hosseinabadi
Open Journal of Political Science (OJPS) , 2018, DOI: 10.4236/ojps.2018.82012
Abstract: The United Nations, as the central core, coordinates the steps taken to establish international peace and security and to develop friendly relations between countries, based on the principle of equality of rights and autonomy of nations, and achieve international cooperation in the sphere of economic, social and cultural affairs and encourage governments to respect human rights and fundamental freedoms. Hence, all countries should, with respect to membership in the organization, act in accordance with the obligations under the Charter and resolve all their international disputes through peaceful means, based on the principles of justice and international law. However, there are two methods for recognizing international law:?the method of social cognition and rational method. The social recognition method of the international system is to abandon theoretical insights of international law and address existing facts and to extract the patient and accurate historical and social data that constitute the living material or the substance of the legal rule. The method of the logical recognition of the principles and rules of international law is to explain the nature and method of legal argument that has a significant impact on the proper understanding of the legal rules and the recognition and analysis of international law and finally the introduction of a system governing international relations. Using the first method, the international community is described first. Then, its life is studied in motion (inductive method); as using the second method, the accuracy and inaccuracy of those cases and judgments are evaluated, which?are?the introduction of other judgments (deductive method). These two methods, that is, the objective observation of events and logical reasoning, if coordinated, will pave the way for the analysis of the international system and explain its characteristics, and international law will be in its place.
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