Automated Guided Vehicle System (AGVS) become more and more significant industrial and scientific applications. Also, these AGVs can be applied to public area using service robots like office and hospital. Since the task assignment problem occurs and the task assignment method of AGVs affects a performance of AGVS, operation strategies of AGVs is very important. In this paper proposed between AGV and station for on-line and decentralized dispatching which improves a performance of AGVs. The protocol is modeled by Petri net to check resource conflict and deadlock problem. In order to conform the feasibility of the proposed protocol, the computer simulation is carried out.
The delivery of consumer goods and commodities to stores in order to support urban lives is one of the most vital activities in the city. Efficient urban goods movement starts with an efficient system for loading/unloading, pick-up/delivery, and commercial truck which may be carried out parking spaces. In this paper, a simulation analysis using the WITNESS simulation package was performed for each type of improvement in the delivery system, loading/unloading system, and the commercial truck with the aim of reducing the waiting time of trucks in the parking lot, and decreasing the withholding time of goods in the parking spaces of commercial districts