The work considers the problem of solving a system of fuzzy relational equations with inf-implication composition and introduces the concepts of a characteristic matrix and attainable components. It is first shown that solving the system is closely related with the covering problem. Further, it is proved that maximal solutions of the system correspond to irredundant coverings of the characteris...

A numerical algorithm for solving obstacle scattering problems is presented. This algorithm is based on the Modified Rayleigh Conjecture (MRC) method introduced by A. G. Ramm. Its numerical implementation shows that the method is efficient, can handle nonsmooth 3D obstacles and obstacles with complicated shapes. Numerical examples are given.

We formally investigate some computational obstacles to tractability of computing the variety determined by K complex polynomials in N boolean variables. We show that using algebraic methods for solving combinatorial problems, the obstacles to tractability lies in the order of magnitude of asymmetries admitted by the given system of equations.

Forging is a manufacturing process that consists of shaping the metal using localized compression forces. The blows are delivered with a hammer (often an electric hammer) or a die. In this paper, different methods of forging (multi-directional forging, hot forging, near-beta forging, multi-axial forging, direct powder forging, warm forging and ring forging) are discussed. The main problems that...

this research was conducted to identify problems and obstacles in formation of job-related learning among agricultural students in university of tehran. it was a descriptive-correlational research. statistical population of the study consisted of 1103 agricultural students, out of whom 201 students were selected as sample, based on cochran’s formula. stratified random sampling technique was emp...

BACKGROUND There has been little reported research into the effect of war on the behaviour and emotional well-being of pre-school children. AIMS To investigate the relationship between exposure to war trauma and behavioural and emotional problems among pre-school children. METHOD A total of 309 children aged 3-6 years were selected from kindergartens in the Gaza Strip, and were assessed by ...

This paper presents a simple and efficient approach to the computation of avoidance maneuvers among moving obstacles. The method is discussed for the case of a single maneuvering object avoiding several obstacles moving on known linear trajectories. The original dynamic problem is transformed into several static problems using the relative velocity between the maneuvering object and each obstac...