Journal of Operational Research in its Applications
Year:2007 | Volume:4 | Issue:14|Papers Count:8

Different numerical methods offer for solving wave equation with diverse boundary conditions. In these methods given partial (Differential Equation: DE) change to a normal DE system using equation separating in terms of time variable method. Pade approximation is used for appreciative calculation of exponential matrix function which is created in response of normal DE. Furthermore, its error and stability are investigated by separating method, parallel algorithm is proposed for solving normal Differential Equation and numbers of function in serial and parallel methods are compared.

An optimization model with a linear objective function subject to a system of fuzzy relation equations with Yager's union operator in special case is presented. The solution set of such a fuzzy relation equations is a non-convex set. In this paper, we characterize the feasible solution set and then, optimize a linear objective function. In order to optimize it, we convert it to an equivalent problem involving 0-1 integer programming with a branch-and-bound solution technique. Furthermore, a concrete example is included for illustration purpose.

Recursive neural networks are one of the adoptive models that suited for processing graphs. Originally recursive neural networks are proposed to processing DAOGs in which the children of any given node are ordered. This assumption is unnecessary constraints. In this paper the weight sharing method that can relax the constraint on the ordering of children in graph processing is introduced. Also a new model of recursive neural networks to process DAG-LE is introduced. Both methods guarantee the independence of the network output with respect to the permutations of the arcs leaving from each node. In continuation an object recognition based on the last recursive model is presented. This method dose not include any priori knowledge on the object model and it is invariant under image translation and rotation.

Suppose that we have  disks of distinct sizes such that initially even disks are stacked on the first peg ordered by size with the smallest at the top and the largest at the bottom and similarly odd disks are stacked on another peg. In this Paper we want find optimal solution for transition disks to the third peg by using the well-known movements of Tower of Hanoi.

In this paper the ADM and HPM for computing the Gamma function will be introduced. Also we compare the obtained results. The simplicity and efficiency of the proposed method will be shown by some examples.

FZPA is a planar structure which is used to concentrate electromagnetic wave in a focal point. Therefore, Fresnel can be interpreted as a convergent element. In this paper both circular Fresnel zone plate antenna (FZPA) and the new FZPA using PBG are presented. In fact the circular Fresnel zone plate antenna with and without PBG structures were simulated to study the effect of changing the some parameters. The proposed antennas were fabricated to validate the simulations results and the experimental results are in relatively good agreement with the analysis.

The present investigation is concerned with reasons of the educational decline in Math, among high school students in Khorramabad. In the present study, the statistical society was consists of: A) all of the high school students in Khorramabad. B) Math teachers in Khorramabad, which have been teaching in both 1 and 2 educational regions. Using cluster sampling, in two mentioned educational regions, a sample group including 800 secondary pupils and 60 Math teachers were randomly chosen. Questionnaires consist of 36 questions; including five-items (very low, low, moderate, high, and very high) were designated for each of the groups, separately. The questionnaires planned in such a way that every six questions referred to one of the hypothesis of the research. The hypothesis of the research investigates teacher, student, organization, society and family factors on educational decline. After gathering the question sheets and following analysis of the data using SPSS and EXCEL computer's soft wares, the results from both the groups were shown in figure and table. All of the research hypothesis were confirmed with sure of 95%, using chi-square tests. Qualitative choices were converted to quantitative ones using phasic numbers, so hypothesis were evaluated and prioritized. The factors affecting educational decline in the Math course based on the results for each groups were as follow, respectively:Group A): School, Society, Student, Organization, Teacher and Family. Group B): Student, School, Family, Society, Teacher and Organization.

This paper presents the different systems that used in suspension and generaly study the benefits and harmful effects of this systems. The first step in analysis of a system is presentation of a sutable physical model. The main aim of model is not necessary a complex model, but is a model that explain the relationsheeps between variabilities of system conditions really, and provide the aims of disigner. From these physical models can be used in analysis of stability, ride quality and stiffness coefficient of sprins, and damping coefficient, influency of road unevenness.