The main objective of this paper is to investigate the economical limit for the ships’ increase in size. Ship size is one factor out of many that affect the investors in the shipping business. The paper seeks to reassess the validity of well-established theoretical frameworks, which support the concept of depending on the increase in size of ships prompted by economies of scale. The investigati...

A special case of the Time-Dependent Shortest Path Problem (TDSPP) is the itinerary planning problem where the objective is to find the shortest path between a source and a destination node which passes through a fixed sequence of intermediate nodes. In this paper, we deviate from the common approach for solving this problem, that is, finding first the shortest paths between successive nodes in...

We establish an exact correspondence between temporal logic and a subset of TSQL2, a consensus temporal extension of SQL-92. The translation from temporal logic to TSQLZ developed here enables a user to write high-level queries which can be evaluated against a spaceefficient representation of the database. The reverse translation, also provided, makes it possible to characterize the expressive ...

Understanding a ship’s present position has been one of the most important tasks during a ship’s voyage, in both ancient and modern times. Particularly, a ship’s dead reckoning (DR) has been used for predicting traffic situations and collision avoidance actions. However, the current system that uses the traditional method of calculating DR employs the received position and speed data only. Ther...

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