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Glavni cilj modeliranja prometnog sustava je uspješno poslovanje i kontinuirano istraživanje mogućnosti za njegovo poboljšanje. Primjenom modela predloženog u ovom radu mogu se dobiti korisni rezultati potrebni za uspješno upravljanje lučkim sustavom. Ovi bi rezultati trebali usmjeriti menadžere u luci na donošenje odgovarajućih odluka u cilju poboljšanja poslovne efikasnosti i povećanja konkurentnosti luke. Model se temelji na teoriji općih sustava. Lučki sustav može se predstaviti kao fizički sustav koji tijekom vremena mijenja stanja na slučajan način, tj. prelazi iz jednog stanja u drugo pod utjecajem slučajnih čimbenika koji se ne mogu unaprijed predvidjeti. Ovdje je sustav "usluživanje broda na pristanu" definiran sa skupom elemenata i veza između njih, odnosno UC-strukturom. Nadalje, identificirana su stanja i prijelazi između stanja, zajedno sa shemom ST-dijagrama. Na temelju ST-dijagrama, postavljen je sustav diferencijalnih jednadžbi i preporučen računalni program za njihovo rješavanje., The main goal of the traffic system modelling is successful running a business and continuously searching the possibilities for its improvement. With the application of the model set in this paper one can get the valuable results for managing the port system. These results should route the port managers to bring appropriate decisions in order to enhance the business efficiency and enlarge the port competitiveness. The model presented is based on the general systems theory. The port system can be presented as a physical system which over time changes its status to a random manner i.e., exceed from one state to another under the influence of random factors that cannot be predicted in advance. Here, the system "serving ship at quay" is defined with the universe of discourse and couplings (UC-structure), dividing it on elements and links between them. Next, the states and the transitions between the states are identified, along with the scheme (ST-diagram). From the ST-diagram the system of differential equations is set and the computer program for solving is recommended.

This paper focuses on a bulk terminal short term operations planning problem faced by the port management in tactical decision making. Loading and discharging of ship cargo, cargo stocking, maintenance and service of facility equipment are regular operations of a sea port's bulk terminal. Their organization is subject to difficult-to-predict or unforeseen influences. The challenge that port management faces in day to day operations is in making the best possible plan with scheduled duration of operations/states and transition instants, considering various internal and external factors influencing terminal performance. A states and transitions model is used to derive effective solutions for obtaining states order and states transition time of a bulk terminal, with the objective of minimizing operational costs. Behavior of the terminal is tested with stochastic and deterministic methods.