ANCHORAGE-SHIP-BERTH LINK AS QUEUEING SYSTEM WITH PRIORITY SERVICING IN PORTS
ZORAN RADMILOVIÄ 1, BRANISLAV DRAGOVIÄ 2, DONG-KEUN RYOO 3 (1)FACULTY OF TRANSPORT AND TRAFFIC ENGINEERING, UNIVERSITY OF BEOGRAD, 11000 BEOGRAD, VOJVODE STEPE 305, SERBIA
(2)MARITIME FACULTY, UNIVERSITY OF MONTENEGRO, 85330 KOTOR, MONTENEGRO
(3)KOREA MARITIME UNIVERSITY, COLLEGE OF INTERNATIONAL STUDIES, DIVI
Ship arrivals and loading/unloading operations at ports are frequently considered to be a stochastic nature and are convenient to be modeled with queueing theory. In this paper we considered an anchorage-ship-berth link (ASB link) in which ship arrivals are assumed to follow the Poisson distribution and their servicing to have deterministic and exponential service rates. In addition to this, we assumed that the ships are served on a "first come - first served" basis with preemptive and non-preemptive priorities and that the anchorage area is limited and unlimited. As usually in the real-life port situations, some classes of ships of liner service are given the first class priority and the other classes of ships are given the second class priority. The whole multi-purpose terminal (in sea and river ports) is designed as an M/D/c/N queueing system in first case with limited anchorage and in second case the multi-purpose port terminal is designed as an M/M/c queueing system with unlimited anchorage area in Kendall's notation. Obtained analytical results are meant to be helpful to the port planning to the process in the best possible time saving way.
