in this paper, a very efficient method, called single matrix block analyzer (smba), has been developed to determine relative permeability and capillary pressure curves from spontaneous imbibition (si) data. smba mimics realistically the si tests by appropriate boundary conditions modeling. in the proposed method, a cuboid with an identical core plug height is considered. the equal dimensions of...

hybrid of rationalized haar functions are developed to approximate the solution of the differential equations. the properties of hybrid functions which are the combinations of block-pulse functions and rationalized haar functions are first presented. these properties together with the newton-cotes nodes are then utilized to reduce the differential equations to the solution of algebraic equation...

This paper introduces different construction techniques of parity-check matrix H for irregular LowDensity Parity-Check (LDPC) codes. The first one is the proposed Accurate Random Construction Technique (ARCT) which is an improvement of the Random Construction Technique (RCT) to satisfy an accurate profile. The second technique, Speed Up Technique (SUT), improves the performance of irregular LDP...

An algorithm for orthogonal 4-tap integer multiwavelet transforms is proposed. We compute the singular value decomposition SVD of block recursive matrices of transform matrix, and then transform matrix can be rewritten in a product of two block diagonal matrices and a permutation matrix. Furthermore, we factorize the block matrix of block diagonal matrices into triangular elementary reversible ...

Sparse matrix methods for factorizing a nonsingular matrix are considered. The possibility of using the little known technique of implicit LU factors is explored, particularly in the context of simplex-like methods for Linear Programming. The concept of a spike-preserving ordering is introduced and a new method for calculating such an ordering is described, based on the recursive use of Tarjan'...

In this paper, we give the theoretical analysis of χ attack proposed by Knudsen and Meier on the RC6 block cipher. To this end, we propose the novel method of security evaluation against χ attack precisely including key dependency by introducing a technique “Transition Matrix Computing.” On the other hand, the way of security evaluation against χ attack has not been known except the computer ex...

This paper extends to non-controllable linear systems over rings the property FCs (s > 0), which means “feedback cyclization with s inputs”: given a controllable system (A, B), there exist a matrix K and a matrix U with s columns such that (A + BK, BU) is controllable. Clearly, FC1 is the usual FC property. The main technique used in this work is the obtention of block decompositions for system...