We study sign-restricted matrices (SRMs), a class of rectangular ( 0 , ± 1 ) -matrices generalizing the alternating sign (ASMs). In an SRM each partial column sum, starting from row 1, equals or and is nonnegative. determine maximum number nonzeros in SRMs characterize possible sum vectors. Moreover, results on interchange operations are shown, both for and, more generally, -matrices. The Bruha...

Ratcliff, Clark, and Shiffrin (1990) examined the list-strength effect: the effect of strengthening (or weakening) some list items upon memory for other list items. The list-strength effect was missing or negative in recognition, missing or positive in cued recall, and large and positive in free recall. We show that a large number of current models fail to predict these findings. A variant of t...

Keywords: Quadratic transformation Hypergeometric function of order two Kummer–type transformations Bailey's transform a b s t r a c t By applying various known summation theorems to a general formula based upon Bailey's transform theorem due to Slater, Exton has obtained numerous new quadratic transformations involving hypergeometric functions of two and of higher order. Some of the results ha...

Our group tested three quality assessment functions in CASP8: a function which used only distance constraints derived from alignments (SAM-T08-MQAO), a function which added other single-model terms to the distance constraints (SAM-T08-MQAU), and a function which used both single-model and consensus terms (SAM-T08-MQAC). We analyzed the functions both for ranking models for a single target and f...

The concept of affordances has been suggested as a way to understand the effects of information technology (IT) on human behavior and the factors that affect individual IT use. However research has discussed affordances mostly on a conceptual or theoretical level. We empirically investigate different characteristics of affordances to understand the factors that influence users’ understanding of...