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In this paper, two generic constructions of optimal frequency-hopping sequence (FHS) sets employing d-form functions with difference-balanced property are presented. They generalize the previous constructions of optimal FHS sets using m-sequences and produce new optimal FHS sets that cannot be produced by the earlier constructions. By choosing appropriate d-form functions with difference-balanced...
In order to reduce the difficulty and complexity on computing the projection from a real Hilbert space onto a nonempty closed convex subset, Yamada has provided the hybrid steepest-descent method for solving variational inequalities. Recently Xu has provided the modified and relaxed hybrid steepest-descent method for variational inequalities based on the minds of the Gauss-seidel method, and given...
Based on canonical cover or minimum cover for functional dependency set F, a data structure MAC is constructed, which facilitates to compute closures of all attributes sets. Using MAC, a fast algorithm of computing closure of an individual set of attributes is improved to efficiently find candidate keys. The improved algorithm of finding candidate keys neednpsilat compute closures of the total subsets...
The extension set is one of three mainstays of extenics and the dependent function is its core, so it became an important work of extenics to be studied. Because of the complexity of system, the values of some characters of the researched thing should be denoted by intervals. In order to treat this situation, we propose the interval location value and establish the interval elementary dependent function,...
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