researches prove that effective customer management along with using customer knowledge is one of the topics that can produce competitive advantage in comparison with the other e-commerce topics. mining the customer knowledge with the aim of helping the managers in better ad strategy making will be possible using the systems with ability of extracting the behavioral patterns of customers from d...

swastika designs applied for ornamenting in many different arts before islamic period. these designs have important role in architecture ornaments at islamic period. in this paper we study concepts, aesthetic and evolution of these designs in islamic period architecture ornaments from beginning to end of zand and ghajar era. the thoughtful artists of islamic periods comprehended from the beginn...

The success of applying generalized complex orthogonal designs as space–time block codes recently motivated the definition of quaternion orthogonal designs as potential building blocks for space–timepolarization block codes. This paper offers techniques for constructing quaternion orthogonal designs via combinations of specially chosen complex orthogonal designs. One technique is used to build ...

Let D be the triangle with attached edge (i. e. D is the graph having vertices {a0, a1, a2, a3} and edges {a0, a1}, {a0, a2}, {a1, a2}, {a0, a3}). J.C. Bermond and J. Schönheim [1], proved that a D-design of order n exists if and only if n ≡ 0 or 1 (mod 8). Let (W, C) be a nontrivial D-design of order n, n ≥ 8, and let V ⊂ W , |V | = v < n. We say that a handcuffed design (V,P) of order v and b...