Page 50 - Demo

%u062c%u0645%u064a%u0639 %u0627%u0644%u062d%u0642%u0648%u0642 %u0645%u062d%u0641%u0648%u0638%u0629 %u0640 %u0627%u0625%u0644%u0639%u062a%u062f%u0627%u0621 %u0639%u0649%u0644 %u062d%u0642 %u0627%u0645%u0644%u0624%u0644%u0641 %u0628%u0627%u0644%u0646%u0633%u062e %u0623%u0648 %u0627%u0644%u0637%u0628%u0627%u0639%u0629 %u064a%u0639%u0631%u0636 %u0641%u0627%u0639%u0644%u0647 %u0644%u0644%u0645%u0633%u0627%u0626%u0644%u0629 %u0627%u0644%u0642%u0627%u0646%u0648%u0646%u064a%u062950- 50 -3 - models and sizes of vessels of one type: the designs of old vessels differ from the new at least in terms of the slots, which have a dramatic impact on the handling and shipping to and from the ship, the old ships narrow slots and thus take longer to serve compared to the new ones that Its slots are wide.4 - The form of the distribution of goods in the yards of the vessel affects the time of service at the port.the above factors affecting the time of vessel service, we note that there is an inverse relation between the service time and the waiting time. This relationship shows that the decrease in the time period in which handling works can be achieved in the operation of the ship beside the berth can be used in service other vessel, which means the possibility of lower waiting for another vessel to empty the berth.the previous relationship requires the use of the queue theory, and one of the UNCTAD studies presented a table of ships waiting transactions that was prepared on the basis of the relationship between the average waiting period of ships that arrive at the port randomly and the average service time of the ship based on the equations of the waiting queue theory.Example: If you know that in 2019, three million tons of general cargo are traded in one of the ports through eight berths available in the port as well as two berths for containers. The occupancy rate of both types of berths was 90% and 60% respectively. It is expected that the same amount of cargo will be handled in the current year 2013. The average loading and unloading time (service time) for each three-day vessel was on the general cargo berths, and one and a half days on the container berths. Assuming that the net operating days of this port are 300 days, the average daily cost of the general cargo ship is $ 4,000 and the container vessel is $ 25,000. Calculate the improvement in the operational performance on the berths so that the loading and unloading time of each vessel of general cargo is reduced by 20% and by 17% for the container ships after the port management realized that the occupancy rates for these berths are not acceptable.