摘要
By using the generalized Hadamard product, difference matrix and projection matrices, we present a class of orthogonal projection matrices and related orthogonal arrays of strength two. A new class of orthogonal arrays are constructed.
基金
The research is supported by the National Natural Science Foundation of China under Grant No. 10571045
University Backbone Teachers Foundation of the Education Department of Henan Province
Natural Science Foundation of Henan Province under Grant No. 0411011100.