Some asymptotic properties of point estimation with n-dimensional fuzzy data with respect to a special L2-metric ρ are investigated in this paper. It is shown that the collection of all n-dimensional fuzzy data endowed with the ρ-metric is a complete and separable space. Some criterions for point estimation in such fuzzy environments are proposed and the sample mean and variance and covariance ...

All the conventional criterions to verify if a matrix is positive definite, Hurwitz or an M-matrix, such as Sylvester condition and Hurwitz theorem, require us to compute n determinants. This paper develops a new and simple criterion, based on a new type of Gaussian elimination process. In contrast to the traditional criterions, the new criterion only computes one determinate. Thus, the computi...

Federated databases are useful in data integration, because they can provide data from other databases, without physically merging that data. Prolog-based federated databases are based on predicate logic and use the Prolog system to generate results for queries. In this paper we constructed two formal criterions that express that such a Prolog-based federated database is correct. We distinguish...

Abstract In the present investigation, laminated composite beams subjected to a bending static loading are studied in order determine their failure mechanisms and first ply (FPF) load. The FPF analysis is performed using refined rectangular plate element. element formulated based on classical lamination theory (CLT) calculate in-plane stresses. To achieve this goal, several criterions, includin...

The paper studies frequency criterions of recoverability of a single missing value from an observed sequence. Stochastic Gaussian stationary processes that are non recoverable in this sense are called minimal processes; they have a degenerate spectral density. The paper considers this problem in a pathwise setting without probabilistic assumptions; recoverability criterions are formulated in th...

In this work the results of a research are summarized aimed at a definition of criterions and methodologies for valuating the efficiency of online and offline multimedial products for permanent education. Through a theoretical analysis some criterions and references were pointed out for valuating the efficiency of teaching activities based on the use of new multimedial and telematic technologie...

In wireless communication networks Ad-hoc networks are plays dominant role, Mobile Ad-hoc network (MANET) is a collection of wireless mobile nodes that dynamically form a network temporarily without any central administration. The primary objective of this research work is to study and investigate the performance of Dynamic source routing (DSR) protocol and Minimum Maximum Battery Cost Routing ...

The problem of determining an optimal feasible trajectory, for a fixed wing flying vehicle moving in a dynamical threedimensional space, is addressed in this paper, and an analytical solution is proposed. With explicitly considering the boundary conditions and kinematic constraints as well as by satisfying the collision avoidance criterions, trajectories are described in terms of three paramete...