Dubrovnik, Croatia

University of Dubrovnik

Dubrovnik, Croatia

The University of Dubrovnik is a university located in Dubrovnik, Croatia. It has its roots in various successive institutions dedicated to the teaching of maritime engineering and naval architecture. In 1996, in recognition of the city's maritime traditions, the Polytechnic was established and was later given full university status in 2003. The University has since diversified its courses but the maritime science remains its traditional strength. Wikipedia.

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Lipovac V.,University of Dubrovnik
Wireless Personal Communications | Year: 2017

Although the 3G (UMTS) systems physical-layer performance is still described by both bit-error-rate and block-error-rate, the 4G (LTE) uses exclusively the latter that is at higher protocol layers commonly referred to as frame-error-rate or packet-error-rate of downlink and uplink input data streams. However, the block-error-rate estimation scheme heavily depends on the success rate of negative acknowledgements transport via return channel, and so does not provide trustworthy low values (e.g. around 10 - 5). The remaining errors that are not corrected by the physical layer, determine the so-called residual channel and need to be corrected by higher protocols to provide almost errorless application environment. Error rate estimation is therefore important not only in research, development and manufacturing, but also in network operator’s environment. However, relationship between the bit-error and the block-error oriented performance metrics is not always a simple one, even at physical layer alone, as well as through higher-protocol layers. In this paper, we benchmark in practice both types of performance metrics for consistency, specifically on an operational microwave link residual channel, bottom upwards to the application-layer, end-to-end perceptual speech quality measurements. © 2014, Springer Science+Business Media New York.

Agency: European Commission | Branch: FP7 | Program: BSG-SME | Phase: SME-1 | Award Amount: 1.56M | Year: 2008

We propose a two years work, aiming at optimising sea urchin Paracentrotus lividus rearing, in order to enrich pre-existing aquaculture farms (based on sea bass, bream, and/or different bivalves) . Sea urchin breeding will be performed starting from adult specimens obtained from capture. Sea urchin roe (gonads) are first class food and are worldwide commercialised. This project arises from the increasing demand of sea urchin roes and is addressed to the feasibility of sea urchin aquaculture, broodstock and gonad improvement. In the last fifteen years, the aquaculture of sea urchin has been carried out by non-European factories, mainly in Japan, USA and Canada. Unsexed whole sea urchins or their processed gonads are shipped primarily to Japanese markets and to markets in France, Belgium, Greece, Italy and Turkey. The demand in these European Countries is at present partially fulfilled by a high fishing pressure on wild sea urchins, that in some areas (France, Greece) are at risk and protected species. A number of European and ICPC SMEs, dealing with aquaculture, are strongly interested to carry on a research focused at 2 main objectives: 1-to insert sea urchin aquaculture in their activities, in order to enrich and diversify their production, that is already going on with different marine species. 2- to obtain an environmentally friendly expansion of their activity, in order to increase sustainability and prevent environmental impact. The involved SMEs aim at obtaining know how and possibly patents to be invested in their activity, and need RTD activities and training of operators for overcoming problems and enhance competitivity.

Hashi I.,Staffordshire University | Hashi I.,CASE Foundation | Stojcic N.,University of Dubrovnik
Research Policy | Year: 2013

The impact of innovation on firm performance has been a matter of significant interest to economists and policy makers for decades. Although innovation is generally regarded as a means of improving the competitiveness of firms and their performance, this relationship has not been supported unambiguously by empirical work. This paper presents one of the first attempts to assess the drivers of the innovation process in two different institutional settings: mature market economies of Western Europe and advanced transition economies from Central and Eastern Europe. A multi-stage approach to innovation is applied to the firm level data from the fourth Community Innovation Survey (CIS4), covering some 90,000 firms. The findings reveal a positive relationship between innovation activities and productivity. Firms decide to engage in innovation and on how much to invest under pressure of competition. In making these decisions firms rely on the knowledge accumulated from previously abandoned innovations and cooperation with other firms and institutions and other members of their group. Subsidies lead to additional spending on innovation by firms but do not lead to additional innovation output. The results also show that larger firms are more likely to embark on innovation activities and invest more in innovation but innovation output decreases with firm size. Finally, results reveal several differences in behaviour of firms in two groups of countries. © 2012 Elsevier B.V.

Pooh R.K.,CRIFM Clinical Research Institute of Fetal Medicine PMC | Kurjak A.,University of Dubrovnik
Journal of Maternal-Fetal and Neonatal Medicine | Year: 2012

The introduction of 3D/4D sonography with high frequency transvaginal transducer has resulted in remarkable progress in ultrasonographic visualization of early embryos and fetuses and development of new fields of 3D sonoembryology. With the proper use of this new diagnostic modality and with experienced examiner, both structural and functional development in the first trimester of gestation can be assessed more objectively and reliable. Indeed new technology moved embryology from postmortem studies to the in vivo environment. Furthermore, there are good reasons to believe that 3D/4D sonography moved prenatal diagnosis of fetal abnormalities from the second to the first trimester of pregnancy. We will try to illustrate it with the number of convincing slides. © 2012 Informa UK, Ltd.

Krile S.,University of Dubrovnik
Polish Maritime Research | Year: 2013

We need a better transport planning tool for loading maximization and transport cost minimization on the voyage route with multiple loading/unloading (discharging) ports. The implemented heuristic algorithm is able to find out an appropriate routing sequence with maximal earnings and profit. In the same time it looks for minimal loading/discharging and transshipment costs, but with fulfillment of cargo demands in a number of ports on the route. The efficient algorithm for optimal transport of N cargo loads (e.g. contingent of containers) for ships with limited capacity is being developed. This efficient tool may significantly reduce transport costs and ensure maximal profit to freight forwarders. Also, it can be applied for supply chain management of different goods from numerous vendors. The proposed algorithm shows acceptable complexity that means that such optimization tool can be used in shipping supported with limited computing power. © Elsevier BV 2013.

Pooh R.K.,Osaka International University | Kurjak A.,University of Dubrovnik
Journal of Perinatal Medicine | Year: 2015

Recent development of three-dimensional (3D) high definition (HD) ultrasound has resulted in remarkable progress in visualization of early embryos and fetuses in sonoembryology. The new technology of HDlive assesses both structural and functional developments in the first trimester with greater reliably than two-dimensional (2D) ultrasound. The ability to visualize not only fetal face, hands, fingers, feet, and toes, but also amniotic membranes, is better with volumetric ultrasound than 2D ultrasound. In this article, detailed and comprehensive structures of normal and abnormal fetuses depicted by 3D HDlive are presented, including various faces of Down's syndrome and holoprosencephaly, as well as low-set ear and finger/toe abnormalities from the first trimester. Three-dimensional HDlive further "humanizes" the fetus, enables detailed observation of the fetal face in the first trimester as shown in this article, and reveals that a small fetus is not more a fetus but a "person" from the first trimester. There has been an immense acceleration in understanding of early human development. The anatomy and physiology of embryonic development is a field where medicine exerts greatest impact on early pregnancy at present, and it opens fascinating aspects of embryonic differentiation. Clinical assessment of those stages of growth relies heavily on 3D/four-dimensional (4D) HDlive, one of the most promising forms of noninvasive diagnostics and embryological phenomena, once matters for textbooks are now routinely recorded with outstanding clarity. New advances deserve the adjective "breathtaking", including 4D parallel study of the structural and functional early human development.

Durdevic Tomas I.,University of Dubrovnik
Nase More | Year: 2013

A detailed voyage plan must be prepared prior start of the voyage from berth to berth taking into consideration a series of factors which depend on the vessel's size, draught, vessel type, stability, navigation route, meteorological conditions etc. The most important part of the voyage plan for the master and deck offi cers is the route plotted on a paper and/or electronic navigational chart. Consequently, this paper elaborates on the importance of understanding the utilisation of the major constituent elements when making a geometric display of the navigational route.

In this paper the efficient algorithm for optimal transport of different loads (e.g. contingent of containers) for ships with limited capacity is being developed. We need better transport planning and transport costs minimization on a voyage route with multiple loading ports and multiple ports of discharge (unloading). The goal is to improve vessel's capacity by choosing convenient freights and thus achieving greater profit. Such innovations in the logistics of transport might improve technology of seaborne trade, but also be used in the management of forwarding agent's chains for various types of goods.

Krile S.,University of Dubrovnik
Procedia Engineering | Year: 2016

This research is based on savings coming from combination of water production and better planning of water bunkering in ports. Such operational research (OR) approach is based on better utilization of ship tank capacity in relation to water production on board. The efficient heuristic algorithm for optimal decisions for N different water sources (e.g. production by evaporation, production by reverse osmosis process and bunkering in ports + bottled water) for the ship with limited water tanks capacity is being developed. Mathematical model is developed on the basis of capacity expansion problem, same as the Minimum Cost Multi-Commodity Flow Problem (MCMCF). © 2016 Published by Elsevier Ltd.

Lipovac A.,University of Dubrovnik
Wireless Personal Communications | Year: 2014

In this paper, a novel error floor prediction model is proposed for estimating the peak performance of the OFDM transmission in a small-time-dispersion environment - typically indoor. The obtained analytical formula involves both the accordingly modified common channel time-dispersion parameters such as the rms delay spread, but distinct for the advanced and delayed multipath echoes (with respect to the chosen sampling instant), as well as the OFDM signal-specific parameters. The validity of the model was confirmed by the results of the corresponding Monte-Carlo simulations. © 2013 Springer Science+Business Media New York.

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