Access control is one of the most important technologies to guarantee computer security. A new model with support for valid time and usage constraint is described based on full analysis of flaws in existing models. In the new model, authorization rules can express access control policies completely and access constraints are necessary conditions to prevent authorization abuse. To solve the prob...

Induction of transplantation tolerance remains the ideal long-term clinical and logistic solution to the current challenges facing the management of renal allograft recipients. In this review, we describe the recent studies and advances made in identifying biomarkers of renal transplant tolerance, from study inceptions, to the lessons learned and their implications for current and future studie...

Introduction. Iranian talented university students who take term averages below 17 for at least twice can’t use facilities of educational legislation for gifted and talented students in universities. This study deals with validity of this rule. Methods. Renzullis three ring conception of giftedness was selected as gifted definition. Obtaining grade point averages equal or more than 15 was rega...

Background: Diagnosis of anemia is challenging in resource-poor settings due to inadequate laboratory resources. This study assessed the validity of the Tallquist haemoglobinometer in assessing anemia among pregnant women in Osogbo, Southwestern Nigeria.   Methods: This was a cross -   sectional study, in which 200 pregnant women of reproductive age were selected using multist...