the hierarchical hub location problem is encountered three-level network that is applied in production-distribution system, education system, emergency medical services, telecommunication network, etc. this paper addresses the hierarchical hub covering problem with single assignment accounting for mandatory dispersion of central hubs restriction as a special case. this formulation with incorpor...

introduction: the purpose of our study was to evaluate the frequency of behavioral problem in pre school-aged children with visual problem. methods: in this expost facto study, which was selected via convenient sampling , 143 children ranging in age from 3-6 years that refer to optometry clinic for routine eye examination were evaluated . after complete ocular exams including evaluation of visu...

background achievement in university education may be related to one’s emotional intelligent (ei) as well as his/her social skills and emotional control. therefore, it is also probable that the ei be associated with academic and occupational achievement in medical students. objectives the aim of this study was evaluation of the relation between ei and academic achievement of students working in...