Danijela Tuljak-Suban - Academia.edu (original) (raw)

Papers by Danijela Tuljak-Suban

Transportation research procedia, 2024

14th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION, Jun 20, 2014

Sustainability, Oct 19, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Springer eBooks, 2012

ABSTRACT Thinking flexibility and security on labour markets together is a new paradigm because b... more ABSTRACT Thinking flexibility and security on labour markets together is a new paradigm because business as well as labour is in need of security as well as flexibility. The flexibility will increase with accessibility of individual regions in Europe. A study of migration may show us not only how these aims can be achieved, but also may highlight other policies needed for inducing growth. Accessibility is especially increased by investments in European transportation corridors and by removing barriers on the borders (Schengen Agreement). ESPON ATTREG project aims to investigate also the motivation and behaviour of migration flows and daily commuting of human resources in gross migrations and commuting between regions.

Transport, Jan 16, 2017

This article examines the problem of the competition or cooperation of the container terminals in... more This article examines the problem of the competition or cooperation of the container terminals in the North Adriatic hub and spoke system with respect to the leadership position of the ship owners, which defines the flow of containers. The problem is defined as a two-stage game where the shipping companies act as leaders and the container terminals are the followers. The stages of the game are defined as a multi-objective optimization problem on a graph. The proposed simulations and the results obtained could be a first step in defining a sustainable method of collaboration in the hub and spoke system between the ports and the ship owners. The purpose of the article is also to present a systematic examination of a hub and spoke port network based on a competition-cooperation model. The model could also be used by the shipping companies or container terminals to find an optimal strategy in the game and validate their business decisions.

Energies, Oct 23, 2022

Promet-traffic & Transportation, Oct 28, 2019

Choosing an optimal bunkering port that minimises the increase in the operating costs in a hub an... more Choosing an optimal bunkering port that minimises the increase in the operating costs in a hub and spoke system is a multi-criteria decision-making (MCDM) problem. Furthermore, the criteria are related to the port particularities, the environment, fuel price, and some criteria are quantitative while others are qualitative. It is therefore necessary to create a model that takes such features into consideration. Firstly, in this paper a set of the most used criteria will be defined. Then, a method to choose suitable criteria for a hub and spoke system will be proposed. Secondly, using a Fuzzy AHP, weights will be defined and used in a multi-criteria goal function. The outcome is a bunkering policy MCDM model based on the aggregation of fuel consumption and price to criteria related to port characteristics, local aspects and service particularities. All these factors must be considered by a chief engineer (superintendent) in the process of defining a sustainable bunker policy. A case study based on the North Adriatic port system demonstrates the applicability of the proposed model. In addition, the case study highlights that in hub and spoke systems with short loops, feeder ships can regulate cargo capacity and stay at a port with bunkering policy planning.

DOAJ (DOAJ: Directory of Open Access Journals), 2013

Efficient organization of maritime industry is based on adequate human resources. Knowledge and s... more Efficient organization of maritime industry is based on adequate human resources. Knowledge and skills are the results of a well organized study process and training. Since education is part of the public administration, the European Quality Management tool for the Public Sector-Common Assessment Framework (CAF) could be used, in accordance with the STCW convention requirements as a starting point to develop a model that allows quantitative assessment of the Maritime Education and Training (MET) institutions. Evaluation results and procedures are usually described qualitatively as verbal assessments that are part of a report or are summarized in statistical reports. Fuzzy reasoning permits a transition from qualitative to quantitative decision making. For this purpose, we suggest fuzzy modelling, which gives a quantitative assessment of education effectiveness. Evaluators" verbal assessments could be linguistic input variables of a fuzzy decision model, based on CAF recommendations and STCW convention that produces a quantitative mark of the Maritime Education and Training Institution quality.

World Academy of Science, Engineering and Technology, International Journal of Biological, Biomolecular, Agricultural, Food and Biotechnological Engineering, Jan 2, 2015

Food as perishable goods represents a specific and sensitive part in the supply chain theory, sin... more Food as perishable goods represents a specific and sensitive part in the supply chain theory, since changing physical or chemical characteristics considerably influence the approach to stock management. The most delicate phase of this process is transportation, where it becomes difficult to ensure the stable conditions which limit deterioration, since the value of the deterioration rate could be easily influenced by the mode of transportation. The fuzzy definition of variables allows one to take these variations into account. Furthermore, an appropriate choice of the defuzzification method permits one to adapt results to real conditions as far as possible. In this article those methods which take into account the relationship between the deterioration rate of perishable goods and transportation by ship will be applied with the aim of (a) minimizing the total cost function, defined as the sum of the ordering cost, holding cost, disposing cost and transportation costs, and (b) improving the supply chain sustainability by reducing environmental impact and waste disposal costs.

Transportation research procedia, 2023

DOAJ (DOAJ: Directory of Open Access Journals), Mar 1, 2008

The transport of empty containers represents a serious problem in the fast growing sphere of mari... more The transport of empty containers represents a serious problem in the fast growing sphere of maritime container transport. The most widespread type of container transport organization in maritime transport is the hub and spoke mode, which enables the transport of a great number of containers via large vessels between hub ports, from where feeder ships transport to smaller ports that thus gravitate to the central hub port. The article contains a detailed analysis of the northern Adriatic ports and the feeder connections with the hub ports of the Mediterranean. A two-level VRPPD (Vehicle Routing Problem with Pickup and Delivery) problem is modelled on a graph, where the transport of full containers is privileged over the transport of empty containers. This enables the simulation of the feeder system in the n01them Adriatic, meaning that it shows the ship's operator the movement programme with minimal transport costs for the superfluous empty containers in the complex of the regular transports of full containers in the feeder system.

InTech eBooks, Sep 26, 2018

When two cars meet in the dark on a rural road, and both drivers use their headlights on full bea... more When two cars meet in the dark on a rural road, and both drivers use their headlights on full beam, they will both be dazzled. Because of that, we usually dip the lights. However, if modeled as a finite prisoner's dilemma super-game, the standard game theoretic solution would be that both drivers defect and use full lights throughout the super-game. If modeled as an Assurance game, cooperative strategies have better chances of succeeding. Several different strategies are presented and discussed, and in particular whether the strategy most often used by drivers can be invaded by the strategy novice drivers learn in their driver education. On theoretical grounds, one can expect the cooperation to unravel because novice drivers are taught to defect both in the beginning and at the end of the super-game. However, empirical results from three different surveys reveal that novice drivers change their behavior and adapt to normal practice with experience in real traffic. Hence, cooperation has sustained because cooperative and retaliating strategies dominate in the population. In addition, when drivers retaliate by flashing their headlights, it is probably perceived as a negative penalty which causes the inexperienced drivers to adjust the behavior to normal practice.

Promet-traffic & Transportation, Jul 9, 2020

Mitochondrial-dependent (intrinsic) programmed cell death (PCD) is an essential homoeostatic mech... more Mitochondrial-dependent (intrinsic) programmed cell death (PCD) is an essential homoeostatic mechanism that selects bioenergetically proficient cells suitable for tissue/organ development. However, the link between mitochondrial dysfunction, intrinsic apoptosis and developmental anomalies has not been demonstrated to date. Now we provide the evidence that non-canonical mitochondrialdependent apoptosis explains the phenotype of microphthalmia with linear skin lesions (MLS), an X-linked developmental disorder caused by mutations in the holo-cytochrome c-type synthase (HCCS) gene. By taking advantage of a medaka model that recapitulates the MLS phenotype we demonstrate that downregulation of hccs, an essential player of the mitochondrial respiratory chain (MRC), causes increased cell death via an apoptosome-independent caspase-9 activation in brain and eyes. We also show that the unconventional activation of caspase-9 occurs in the mitochondria and is triggered by MRC impairment and overproduction of reactive oxygen species (ROS). We thus propose that HCCS plays a key role in central nervous system (CNS) development by modulating a novel non-canonical start-up of cell death and provide the first experimental evidence for a mechanistic link between mitochondrial dysfunction, intrinsic apoptosis and developmental disorders.

IFAC-PapersOnLine, 2015

In many cities the food and drug waste is invading their districts, and disposal fees are high. I... more In many cities the food and drug waste is invading their districts, and disposal fees are high. In this paper we investigate how to determine an optimal ordering cycle when the demand for products and the price are fuzzy variables, and lead time is constant, in the case of perishable food or drugs of unknown deteriorating ratio, and at high disposal fees. The parameters required for the solution are trapezoidal membership functions for the fuzzy demand, the fuzzy purchase cost for each item, the fixed cost to place the order, and the cost of disposal (i.e. disposal fee), the fuzzy deterioration rate, and the fixed storage cost specified for each item per period. The three fuzzy parameters in the total cost function are described as trapezoidal fuzzy variables so that the influence of volatility of these variables on the criterion function could be calculated. In the paper, the safety stock decays at the same rate as the rest of the inventory. Credibility distributions are given for such cases. Here, we demonstrated that the expected value of total costs in the ordering cycle is equal to the signed distance to the origin. The kurtosis of variables when appearing simultaneously, and their influence on the disposal fee are under investigation, therefore the trapezoidal membership functions are investigated. Through an extensive analytical study and the numerical example, we concluded the following: (1) for the items having a trapezoidal demand membership function, increasing the volatility of demand generates a membership function with a flatter shape, thus shortening the optimal ordering cycle, and (2) an increment of fuzziness reduces the optimal cycle length more gradually than the crisp values, when the sum of the purchase price plus the disposal fee of the product, or the demand, or the deterioration rate are increasing. This means that a high fuzziness reduces the sensitivity of the optimal cycle duration.

Symmetry, May 6, 2020

When solving a Multi-Criteria Decision-Making problem of any degree of complexity, many researche... more When solving a Multi-Criteria Decision-Making problem of any degree of complexity, many researchers rely on the analytic hierarchy process (AHP). To consider mutual connections between criteria and clusters at the same level and not only the hierarchical structure between criteria and subcriteria, researchers often upgrade from AHP to the Analytic Network Process (ANP), which also examines the interdependency of criteria. However, the ANP method requires a large number of pairwise comparisons. In the case of a complex decision-making problem, the authors of this paper suggest upgrading the AHP method with the graph theory and matrix approach (GTMA) for several reasons: (1) The new method is based on digraphs and permanent value computation, which does not require a hypothesis about interdependency; (2) in case of similar alternatives, the distinguishable coefficient of the new method is higher than those computed for AHP and ANP; (3) the new method allows decision makers to rank comparable alternatives and to combine structurally similar methods without increasing the number of comparisons and the understanding of the results. The developed method (AH-GTMA) is validated by a numerical example of a complex decision-making problem based on a symmetrical set of similar alternatives, a third party logistic provider (3PLP) selection problem.

Sustainability, Apr 18, 2019

Sustainable concerns are reputed to be of the utmost priority among governments. Consequently, th... more Sustainable concerns are reputed to be of the utmost priority among governments. Consequently, they have become more and more of a concern among supply chain partners. Logistics service providers (LPs), as significant contributors to supply chain success but also one of the greatest generator of emissions, play a significant role in reducing the negative environmental impact. Thus, the performance evaluations of LPs should necessarily involve such a measure which, firstly, represents a balance between all three pillars of sustainability and, secondly, consider the desirable and undesirable performance criteria. This paper proposes an integrated analytic hierarchy process (AHP) and slack-based measure (SBM) data envelopment analysis (DEA) model, based on the assumption of a variable return to scale (VRS). An AHP pairwise comparison enables selecting the most influential input/output variables. Output-oriented SBM DEA provides simultaneously evaluation of both the undesirable and desirable outputs. The proposed model was tested on a numerical example of 18 LPs. The comparison of output Charnes, Cooper and Rhodes (CCR) and SBM DEA models resulted in a higher number of inefficient LPs when the SBM DEA model was applied. Moreover, efficiency scores of inefficient LPs were lower in SBM DEA model. The proposed model is fair to those LPs that are environmentally friendly.

Central European Journal of Operations Research, Jan 7, 2011

ABSTRACT In this paper, we demonstrate that the fuzzy pricing model can improve regression analys... more ABSTRACT In this paper, we demonstrate that the fuzzy pricing model can improve regression analysis in applications where non-smoothness appears. Combining the fuzzy and regression approaches it is capable of modelling complex non-linearities. The application of this approach describes an effort to design a regression-fuzzy system to estimate real estate market values, especially for vacant urban plots. The results are compared with those obtained using a traditional multiple regression model only. The changes of parameters in the domain of independent variables of the regression function are determined by the analysis of membership functions defining the terms of the fuzzy model. The paper also describes possible future research. The suggested method is interesting for real estate appraisers, real estate companies, and bureaus because it provides a better overview of location prices. The suggested approach could be also used in various other economic and business analyses. KeywordsFuzzy logics–Regression analysis–Land valuation–Land market

The International Journal of Logistics Management, Aug 10, 2015

Purpose – The purpose of this paper is to investigate the prevalence of the application of standa... more Purpose – The purpose of this paper is to investigate the prevalence of the application of standards and their positive influence on the efficiency and competitiveness of Slovenian logistics service providers. Moreover, an analysis was also done on the relationship between the adoption of the environmental standard and greater concern for the environment. Design/methodology/approach – A small sample analysis was done using a combination of statistical methods and an abductive approach. A χ2 analysis was utilized to test the hypotheses. Findings – Many benefits were indicated. However, a positive relationship between quality standards and efficiency, as well as competitiveness, was not confirmed. In addition, the implementation of ISO 14001 quality standards was found to have no effect on the higher investment in environmental protection. Research limitations/implications – This study is limited by its local aspect (Slovenia), small sample size and its focus on just quality standards and their external factors. Future studies should be extended to the countries of eastern Europe and should further examine the relationship of internal factors as well as the relationship between the adoption of quality standards and the supply chain. Practical implications – A survey is essential not just for the Slovenian industry but also for the wider logistics industry as well as for government authorities and standards providers. Originality/value – This is one of the first papers written to analyse the effects of quality standards on international logistics service providers and the first paper that has explored the impact of standards on Slovenian logistics service providers.

TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation

Should an oil spill of tier III magnitude occur in the Northern Adriatic, there is a high probabi... more Should an oil spill of tier III magnitude occur in the Northern Adriatic, there is a high probability that the oil will reach and pollute the surrounding coastline. Therefore, it is vital to conduct coastal vulnerability studies to develop priority plans and coastal vulnerability maps to help first responders protect the coastline. As there is no common contingency plan for oil spills in the Northern Adriatic, three countries, Italy, Slovenia, and Croatia, which share the area, decided to participate in the North Adriatic Incident Response System (NAMIRS) project. Part of the project was to conduct a coastal vulnerability study in the area. One of the three pillars for determining vulnerability, in addition to the ecological and geomorphological factors, is the socioeconomic aspect, which was studied as part of the research. As there are no clear scientific methods to determine the vulnerability of the socioeconomic factors, a survey was conducted where the participants gave their subjective opinion on its value. This was done through three workshops organised in each participating country, where professional stakeholders familiar with the state of socioeconomic activities assessed their vulnerability. The values obtained were combined with the assessments of the geomorphological and environmental factors and gathered in a coastal vulnerability layer, which was incorporated into a GIS as a standard coastal vulnerability map that will help first responders prioritise coastal protection. The research results will also be useful globally and not just in the area studied by NAMIRS, since the method used is readily applicable to any part of the world.

Transportation Research Procedia