patients and methods this retrospective cohort study included 405 renal transplant patients from kerman university of medical sciences hospital, kerman, iran from 2004 to 2010. kaplan-meier method was used to estimate survival rates of patients, and time-dependent cox regression was used to examine the effect of allograft failure on patient survival. results during 4.06 years (median) of follow...

Query languages and query processing are important topics in computer science and information technology, as they are widely used in practical applications. Query languages are usually designed so that intensional predicates can be defined by logic rules and query evaluation can be done in polynomial time in the size of the extensional relations. Studying query processing for a query language i...