The volume of international trade has been increased. Especially, sea- borne trade has played an important part in trade among countries, and increasing maritime traffic causes economies of scale in the shipping and port market.
There are lots of changes in shipping market such as enlargement of vessels and the alliances among shipping companies. Due to these changes, there are many changes of operation and management in the port. One of the significant changes in the port market is that port become bigger according to bigger vessels, the result could cause hub port. To be hub-port and to survive in the market, they devise a lot of strategies.
Especially, the handling productivity is considered on important element in the competition. In addition it is become more important issue in the privatization of terminal. Because this improves the terminal of profitability and is an important element to reduces the port time. Studies in conjunction with the stevedoring productivity conducted at internal and external from the realistic need, but it is too hard to analyzes the whole productivity of terminal. Because of this reason, it isn't embossed with these studies up to recently.
In these days, Ports and terminals make an effort to attract large-sized vessels, because of the enlargement of the vessel and the deepen competition to become hub port. Finally, the efficient container handling capacity is demanded rather than unconditional expansion of equipment and facilities at the terminal side.
In this paper, we analyze the relationship between the enlargement of vessel and port productivity and derive optimal number of container crane by container ship size.