abstract  introduction: recently uses of medium and high energy x-rays has been increased in iran and radiotherapy centers along with a variety of accelerators have been installed in some provinces. in the other hand there is no sufficient skill in designing and making radiotherapy treatment rooms. this study was conducted to evaluate the efficacy of different mixtures of barite concrete for sh...

In the present work, we introduce an improved version of the hyperspheres path tracking method adapted for piecewise linear (PWL) circuits. This enhanced version takes advantage of the PWL characteristics from the homotopic curve, achieving faster path tracking and improving the performance of the homotopy continuation method (HCM). Faster computing time allows the study of complex circuits wit...

This paper proposes the method to the solution of multi objective linear programming problems in fuzzy environment. Here attention has been paid to the study of optimal compromise solution for multi objective fuzzy linear programming problems. Two algorithms have been presented to gives efficient solutions as well as an optimal compromise solution. An illustrative example is given to describe o...

Received: March 10, 2011 Accepted: April 8, 2011 doi:10.5539/jmr.v3n3p159 Abstract This paper presents an alternative technique for solving linear programming problems. It is centered on finding a feasible interior point each time the feasible region is contracted, thus generating a sequence of feasible interior points that converge at the optimal solution of linear programming problem. The con...

This paper presents an algorithm for solving a linear program LP (to a given tolerance) from a given prespecified starting point. The complexity of the algorithm is sensitive to and is dependent on the quality of the starting point, as assessed by suitable measures of the extent of infeasibility and the extent of nonoptimality of the starting point. Two new measures of the extent of infeasibili...