the incidence of brain neoplasm has been progressively increasing in recent years in the industrialized countries. one of the reasons for this increased incidence could be better access to health care and improved diagnosis in the industrialized countries. it also appears that caucasians have a higher incidence than blacks or hispanics or asians. a number of risk factors have been identified an...

investors use different approaches to select optimal portfolio. so, optimal investment choices according to return can be interpreted in different models. the traditional approach to allocate portfolio selection called a mean - variance explains. another approach is markov chain. markov chain is a random process without memory. this means that the conditional probability distribution of the nex...

fault tree analysis (fta) as a probabilistic risk assessment (pra) method is used to identify basic causes leading to an undesired event, to represent logical relation of these basic causes in leading to the event, and finally to calculate the probability of occurrence of this event. to conduct a quantitative fta, one needs a fault tree along with failure data of the basic events (bes). someti...

risks mean cases of uncertainty of project, the impact of which is realized as a threat (negative aspect) and/or opportunity (positive aspect). the traditional viewpoint on risk is a negative viewpoint that implies damages, loss and harmful consequences. judgments such as this on risk merely emphasize on risks management and pay less attention to opportunities management. it is clear that some ...

selecting an effective project plan is a significant area in the project management. the present paper introduces a technique to identify the project plan efficient frontier for assessing the alternative project plans and selecting the best plan. the efficient frontier includes two criteria: the project cost and the project time. besides, the paper presents a scheme to incorporate directed acyc...

cost by considering earnings quality for accepted companies in Tehran StockExchange. This survey investigates a population of 76 companies during the timeperiod of 2009-2014. The results show that under high earnings quality, the marketrisk factor, the book risk to market factor, and the size risk factor have positiveeffects, and the profit risk factor has negative effects on shareholders equit...

abstract circumcision is the most common surgery performed worldwide and about 30% of men are circumcised, of whom 70% are muslim. the majority of male neonates are circumcised based on religious and cultural practices. neonatal circumcision has several advantages when compared to an older age group receiving the procedure. there is considerable controversy about circumcision – neonatal or othe...

purpose: to determine the prevalence and risk factors for retinopathy of prematurity (rop) in high risk premature infants admitted to nicu wards in isfahan from 2003 to 2008. methods: in this retrospective case series, 604 records of high risk infants were reviewed in terms of gestational age, birth weight, oxygen supplementation, delivery method, history of consanguineous marriage, single or m...