Maja Krčum

Experimental results on visibility threshold in human visual perception for application in image/video coding and quality assessment

In assessment of image quality, as well as in image coding, end users are human beings. They need some type of image for work or entertainment. So it is logical to pursuit the goal of achieving better image quality by investigating what is better to human eyes. This paper is a contribution in that direction. Just-noticeable distortion and some aspects of it are discussed and experimental results on the visibility threshold of low gray tones are presented.

Shipboard Monitoring and Control System

An ever increasing degree of automation aboard a ship, as well as complex requirements for functionality and competitiveness in the market, call for a development of programmable systems. These systems must be easily adaptable, possessing an installation as short as possible and a good flexibility with regard to the number of controllable parameters, as well as a possibility of peripheral units being connected to the system. All these components have to be united into an integral shipboard monitoring and control system which makes an intelligent shipboard control system.

Integration Sea and River Ports – the Challenge of the Croatian Transport System for the 21st Century

This paper discusses the indicators of development possibilities for sea ports of national importance which are opened for public traffic: Rijeka, Ploce, Zadar, Split and Dubrovnik, as well as for inland water ports: Vukovar, Osijek, Slavonski Brod and Sisak. Development of traffic and logistic integration processes have been proposed for Croatian sea and river ports, based upon development factors analyses. Croatian sea ports Rijeka, Ploce and inland water cargo ports Osijek, Vukovar, Slavonski Brod and Sisak have been analysed as delivery/forwarding points (nodes), taking into account the directions of goods flows, the participation in the traffic of goods, and all other relevant indicators. The integrated and coordinated approach to the ports and other subjects in the logistic chain redirects the traffic from roads to railways and inland waterways as energy efficient and environmentally – friendly forms of transportation, increases business rationality and optimal organisation users and transportation entities.

Modelling Transport Demands in Maritime Passenger Traffic

In this paper, the research has been carried out on the impact of gross domestic product (GDP) and the number of tourist arrivals (TA) on traffic demand in maritime passenger traffic in the Republic of Croatia. The initial assumption of this study is that the number of passengers carried in Croatian maritime transport (NP) depends on the number of tourist arrivals and the gross domestic product. The results are based on statistical methods of regression and correlation analysis. Tha analysis period spans over the years 1979. – 2013. The obtained insights could help help shippers in maritime passenger transport, and managers at all levels in maritime industry.

Dynamic simulation of permanent magnet synchronous machine

Electric drive is increasingly gaining in importance within the general ship propulsion system. Contemporary electric propulsion mainly contains a fixed propeller, a synchronous or asynchronous propulsion engine and a PWM frequency converter with an adequate drive. During recent years the azimuth system has become the most popular concept within the shipboard electric propulsion system. Ships maneuverability has been significantly improved and the hulls vibration reduced. The employment of an external propulsion unit gives additional space for cargo or passengers. Dynamics of operation of the marine permanent magnet synchronous machine has been analyzed during operation in case of sudden increase of loading at propeller by application of mathematical model MatLab/sup /spl reg//.

Simulation Method and Propulsion Plant Simulator

It is not always possible to note the effects of a damage on a part of the vessel˘s electric system-net in normal work conditions. Certain damages are rare so their effects are rarely noted. That is the reason of simulating certain damage effects by computers. The best way to acquire practical experience is to learn from real life in a real time, but today the efficiency requirements do not allow for this kind of onboard education. Paper illustrates the use of the asynchronous machine on a 3 HP 220 V industrial motor and also the propulsion plant simulator and its various applications will be discussed in this paper. This paper deals with some actual aspects of using the modern teaching aids - simulators for education and training of officers. The methodical approach is particularly to explain the application of simulators of sophisticated ship˘s systems and optimization of the practical training of the students creating the scenarios in accordance with STCW. Copyright S 2000 IFAC

Integrated Bridge System for High-Speed Vessels

Abstract An integrated bridge system, by its control and information concept resembling an aircraft pilot-cabin known as the cockpit, has been developed for high-speed vessels. Some of the world well-known companies have accordingly developed the systems designed for modern high-speed vessels termed the ship cockpit. The ship cockpit system, particularly regarding its safety, efficiency and economy for similar vessels converted to cany passengers and vehicles between the Croatian mainland and its islands, has been thoroughly analysed in this paper The applications of this system, its basic features, its employment in navigation and the equipment arrangement on the bridge have also been discussed.