We address the problem of estimation of covariance matrices expressible as a sum of Kronecker products (KPs). Our goal is to arrive at estimates of the KP component matrices within a maximum-likelihood (ML) framework. Since the exact solution of the ML cost function is non-tractable, we propose a covariance-matching (CM) approach, noting that the estimates obtained from covariance-matching coin...

The term "cancer" is an umbrella for a large number of malignant diseases which vary in severity and type. Therefore, many problems are associated with crossmatching a patient with this diagnosis. Blood use may vary greatly in amount and in the urgency of its need. The diseases themselves may cause cold reactive auto agglutinins to appear. The diseases and their treatments may cause red cell an...

Background. Homograft valves are subject to calcification and structural degeneration in the long term. Blood group matching is performed in many centers, and it remains controversial whether immunologic responses associated with potential blood group incompatibility contribute to the degeneration of unmatched homografts. We studied the expression of carbohydrate blood group antigens on valve e...