Educational researchers in the United States contend that making low-performing students repeat a grade is an ineffective educational practice. This view derives largely from the summary of grade retention research reported by Holmes (1989). A meta-analysis of more recent studies (Jimerson, 2001) also concludes that the practice of grade retention should be abandoned. However, a thorough examin...

BACKGROUND The fragile X gene contains an unstable trinucleotide (CGG) repeat that expands as it is passed from female carriers to the affected offspring. Obligate female carriers may have a premutation or full mutation genotype. METHODS In this study, fragile X premutation and full mutation female carriers were compared on three tasks of visual processing and cognitive skills. RESULTS In e...

purpose : to evaluate indications, risk factors and outcome of repeat penetrating keratoplasty (pkp) at a tertiary referral eye care center methods : in this retrospective study, medical chart of patients who underwent repeat pkp at labbafinejad medical center between january 2004 and december 2009 were reviewed. results : a total of 1,859 corneal transplantations were performed on 1,624 eyes d...

background: cesarean delivery is a surgery for deliver a baby. women with previous cesarean delivery (cd) must often choose between a vaginal delivery (vd) and repeat cd. our aim of this study was to investigate factors associated with preference for cd in neyshabur pregnant women with previous cd. methods: a cross‑sectional study was conducted on all pregnant women (who had previous caesarean ...

A framework for real-time communication over a wireless channel is proposed. The concept of deadline dependent coding (DDC), previously suggested by the authors, is further developed using soft decision decoding of block codes to maximize the probability of delivering information before a given deadline. The strategy of DDC is to combine different coding and decoding methods with automatic repe...