we consider an m/g/1 queue with regular and optional phase vacation and withstate dependent arrival rate. the vacation policy is after completion of service if there are no customers in the system, the server takes vacation consisting of k -phases, each phase is generally distributed. here the first phase is compulsory where as the other phases are optional. for this model the supplementary var...

a total of 250 mothers were interviewed in kashan health centers in 1995 to obtain information on their knowledge, attitude, and practice (k.a.p) regarding supplementary feeding (sf) of their 6-24 month old children. the k, a and p regarding the kind of the first sf. were desirable in 29.2%, 72.8% and 31.6% of the mothers respectively. the corresponding percentages for the time of introduction ...

OBJECTIVE To assess attitudes to breastfeeding among children in primary education and to evaluate the influence of educational lectures on their knowledge. METHODS This was a cross-sectional study of 503 students of both sexes from the fourth to the eighth grades of five different schools. The children were divided into two groups: control (n = 215) and intervention (n = 288) in order to eva...