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Automated storage and retrieval systems (AS/RSs) are material handling systems that are frequently used in manufacturing and distribution centers. The modelling of the retrieval–travel time of an AS/RS (expected product delivery time) is practically important, because it allows us to evaluate and improve the system throughput. The free-fall-flow-rack AS/RS has emerged as a new technology for dr...

the principal goal of this research is the feasibility study of presentation electronic reference services in such centers. in this research, we apply measuring methods in different stages. through this way, we attempt to focus on special governmental information centers in tehran which use internet for acquisition and dissemination of information and also for reference services, methods of col...