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Dr. Danijela Tuljak-Suban
University of Ljubljana Faculty of Maritime Studies and Transport

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Research Keywords & Expertise

0 Fuzzy Logic
0 Logistics and Supply Chain
0 Transport and Logistics
0 Optimization problems
0 Decision making systems

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Multi-Criteria Decision Making
Fuzzy Logic

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Journal article
Published: 08 January 2021 in Sustainability
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Existing research on electric bike sharing systems (e-BSS) emphasises the importance of the sustainability of the systems and the need to respect the views of all stakeholders when planning e-BSS. However, this research overlooks the fact that the sustainability of e-BSS depends to a large extent on the skills and knowledge of the parties who select an electric bike provider, which in most cases is the investor in the e-BSS. There is no previous paper that provides support for investors in (1) defining a set of criteria for selecting a provider that takes into account all of the three domains of sustainability (economic, social, and environmental) and (2) developing a tool that best meets sustainability standards on the one hand and the needs and requirements of all stakeholders (including e-bike users and investors) on the other hand. A distance-based analytic hierarchy process/data envelopment analysis (AHP-DEA) super-efficiency approach was proposed and applied to adapt DEA to the needs of predefined groups by using slack variables. The approach takes into account the fact that not all outputs have a positive impact on the final outcome; the approach also allows decision-makers to define the hierarchical structure of the importance of the criteria directly based on the responses of the selected group. A case study in Slovenia illustrated the application of the approach.

ACS Style

Patricija Bajec; Danijela Tuljak-Suban; Eva Zalokar. A Distance-Based AHP-DEA Super-Efficiency Approach for Selecting an Electric Bike Sharing System Provider: One Step Closer to Sustainability and a Win–Win Effect for All Target Groups. Sustainability 2021, 13, 549 .

AMA Style

Patricija Bajec, Danijela Tuljak-Suban, Eva Zalokar. A Distance-Based AHP-DEA Super-Efficiency Approach for Selecting an Electric Bike Sharing System Provider: One Step Closer to Sustainability and a Win–Win Effect for All Target Groups. Sustainability. 2021; 13 (2):549.

Chicago/Turabian Style

Patricija Bajec; Danijela Tuljak-Suban; Eva Zalokar. 2021. "A Distance-Based AHP-DEA Super-Efficiency Approach for Selecting an Electric Bike Sharing System Provider: One Step Closer to Sustainability and a Win–Win Effect for All Target Groups." Sustainability 13, no. 2: 549.

Journal article
Published: 06 May 2020 in Symmetry
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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.

ACS Style

Danijela Tuljak-Suban; Patricija Bajec. Integration of AHP and GTMA to Make a Reliable Decision in Complex Decision-Making Problems: Application of the Logistics Provider Selection Problem as a Case Study. Symmetry 2020, 12, 766 .

AMA Style

Danijela Tuljak-Suban, Patricija Bajec. Integration of AHP and GTMA to Make a Reliable Decision in Complex Decision-Making Problems: Application of the Logistics Provider Selection Problem as a Case Study. Symmetry. 2020; 12 (5):766.

Chicago/Turabian Style

Danijela Tuljak-Suban; Patricija Bajec. 2020. "Integration of AHP and GTMA to Make a Reliable Decision in Complex Decision-Making Problems: Application of the Logistics Provider Selection Problem as a Case Study." Symmetry 12, no. 5: 766.

Book chapter
Published: 04 March 2020 in Application of Decision Science in Business and Management
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ACS Style

Patricija Bajec; Danijela Tuljak-Suban. A Framework for Detecting the Proper Multi-Criteria Decision-Making Method Taking into Account the Characteristics of Third-Party Logistics, the Requirements of Managers, and the Type of Input Data. Application of Decision Science in Business and Management 2020, 1 .

AMA Style

Patricija Bajec, Danijela Tuljak-Suban. A Framework for Detecting the Proper Multi-Criteria Decision-Making Method Taking into Account the Characteristics of Third-Party Logistics, the Requirements of Managers, and the Type of Input Data. Application of Decision Science in Business and Management. 2020; ():1.

Chicago/Turabian Style

Patricija Bajec; Danijela Tuljak-Suban. 2020. "A Framework for Detecting the Proper Multi-Criteria Decision-Making Method Taking into Account the Characteristics of Third-Party Logistics, the Requirements of Managers, and the Type of Input Data." Application of Decision Science in Business and Management , no. : 1.

Journal article
Published: 18 October 2019 in Promet - Traffic&Transportation
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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.

ACS Style

Danijela Tuljak-Suban. MCDM Bunkering Optimisation in a Hub and Spoke System: The Case of the North Adriatic Ports. Promet - Traffic&Transportation 2019, 31, 539 -547.

AMA Style

Danijela Tuljak-Suban. MCDM Bunkering Optimisation in a Hub and Spoke System: The Case of the North Adriatic Ports. Promet - Traffic&Transportation. 2019; 31 (5):539-547.

Chicago/Turabian Style

Danijela Tuljak-Suban. 2019. "MCDM Bunkering Optimisation in a Hub and Spoke System: The Case of the North Adriatic Ports." Promet - Traffic&Transportation 31, no. 5: 539-547.

Journal article
Published: 18 April 2019 in Sustainability
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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.

ACS Style

Patricija Bajec; Danijela Tuljak-Suban. An Integrated Analytic Hierarchy Process—Slack Based Measure-Data Envelopment Analysis Model for Evaluating the Efficiency of Logistics Service Providers Considering Undesirable Performance Criteria. Sustainability 2019, 11, 2330 .

AMA Style

Patricija Bajec, Danijela Tuljak-Suban. An Integrated Analytic Hierarchy Process—Slack Based Measure-Data Envelopment Analysis Model for Evaluating the Efficiency of Logistics Service Providers Considering Undesirable Performance Criteria. Sustainability. 2019; 11 (8):2330.

Chicago/Turabian Style

Patricija Bajec; Danijela Tuljak-Suban. 2019. "An Integrated Analytic Hierarchy Process—Slack Based Measure-Data Envelopment Analysis Model for Evaluating the Efficiency of Logistics Service Providers Considering Undesirable Performance Criteria." Sustainability 11, no. 8: 2330.

Journal article
Published: 30 May 2018 in International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems
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The Analytic Hierarchy Process (AHP) is, in literature, the most frequently used selection method generally in association with fuzzy logic. In this article some incongruities in the use of fuzzy AHP detected in the literature are presented such as improper use of the defuzzification methods and weak consistency checks of the comparison matrix that in case of scattered comparison matrix could produces results that are clearly a contradiction. We demonstrate how even a careful definition of the third party logistics providers (3PLP) selection criteria may lead to improper results, if the appropriate methods of defuzzification are not used and the concept of “vague” is not well interpreted, both in the comparison phase and in the calculation phase.

ACS Style

Danijela Tuljak-Suban; Patricija Bajec. The Influence of Defuzzification Methods to Decision Support Systems Based on Fuzzy AHP with Scattered Comparison Matrix: Application to 3PLP Selection as a Case Study. International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 2018, 26, 475 -491.

AMA Style

Danijela Tuljak-Suban, Patricija Bajec. The Influence of Defuzzification Methods to Decision Support Systems Based on Fuzzy AHP with Scattered Comparison Matrix: Application to 3PLP Selection as a Case Study. International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems. 2018; 26 (3):475-491.

Chicago/Turabian Style

Danijela Tuljak-Suban; Patricija Bajec. 2018. "The Influence of Defuzzification Methods to Decision Support Systems Based on Fuzzy AHP with Scattered Comparison Matrix: Application to 3PLP Selection as a Case Study." International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 26, no. 3: 475-491.

Journal article
Published: 31 March 2018 in Transport Problems
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ACS Style

Patricija Bajec; Danijela Tuljak-Suban. SELECTING A LOGISTICS SERVICE PROVIDER: A DEFINITION OF CRITERIA THAT CONSIDER THE REQUIREMENTS OF AN EXTERNAL COMPETITIVE ENVIRONMENT. Transport Problems 2018, 12, 157 -168.

AMA Style

Patricija Bajec, Danijela Tuljak-Suban. SELECTING A LOGISTICS SERVICE PROVIDER: A DEFINITION OF CRITERIA THAT CONSIDER THE REQUIREMENTS OF AN EXTERNAL COMPETITIVE ENVIRONMENT. Transport Problems. 2018; 12 (SE):157-168.

Chicago/Turabian Style

Patricija Bajec; Danijela Tuljak-Suban. 2018. "SELECTING A LOGISTICS SERVICE PROVIDER: A DEFINITION OF CRITERIA THAT CONSIDER THE REQUIREMENTS OF AN EXTERNAL COMPETITIVE ENVIRONMENT." Transport Problems 12, no. SE: 157-168.

Journal article
Published: 16 January 2017 in Transport
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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 collabora-tion 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.

ACS Style

Danijela Tuljak-Suban. Competition or cooperation in a hub and spoke-shipping network: the case of the North Adriatic container terminals. Transport 2017, 33, 429 -436.

AMA Style

Danijela Tuljak-Suban. Competition or cooperation in a hub and spoke-shipping network: the case of the North Adriatic container terminals. Transport. 2017; 33 (2):429-436.

Chicago/Turabian Style

Danijela Tuljak-Suban. 2017. "Competition or cooperation in a hub and spoke-shipping network: the case of the North Adriatic container terminals." Transport 33, no. 2: 429-436.

Book chapter
Published: 30 June 2016 in Sustainable Supply Chain Management
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ACS Style

Danijela Tuljak-Suban. Identification of Environmental Criteria for Selecting a Logistics Service Provider: A Step Forward towards Green Supply Chain Management. Sustainable Supply Chain Management 2016, 1 .

AMA Style

Danijela Tuljak-Suban. Identification of Environmental Criteria for Selecting a Logistics Service Provider: A Step Forward towards Green Supply Chain Management. Sustainable Supply Chain Management. 2016; ():1.

Chicago/Turabian Style

Danijela Tuljak-Suban. 2016. "Identification of Environmental Criteria for Selecting a Logistics Service Provider: A Step Forward towards Green Supply Chain Management." Sustainable Supply Chain Management , no. : 1.

Review
Published: 30 June 2016 in Sustainable Supply Chain Management
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ACS Style

Danijela Tuljak-Suban. Food Supply Chain: A Review of Approaches Which Enhance Sustainability with a Focus on Social Responsibility. Sustainable Supply Chain Management 2016, 1 .

AMA Style

Danijela Tuljak-Suban. Food Supply Chain: A Review of Approaches Which Enhance Sustainability with a Focus on Social Responsibility. Sustainable Supply Chain Management. 2016; ():1.

Chicago/Turabian Style

Danijela Tuljak-Suban. 2016. "Food Supply Chain: A Review of Approaches Which Enhance Sustainability with a Focus on Social Responsibility." Sustainable Supply Chain Management , no. : 1.

Journal article
Published: 10 August 2015 in The International Journal of Logistics Management
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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.

ACS Style

Patricija Bajec; Danijela Tuljak-Suban; Evelin Krmac. Do ISO standards favour logistics provider efficiency, competitiveness and sustainability? A Slovenian perspective. The International Journal of Logistics Management 2015, 26, 275 -295.

AMA Style

Patricija Bajec, Danijela Tuljak-Suban, Evelin Krmac. Do ISO standards favour logistics provider efficiency, competitiveness and sustainability? A Slovenian perspective. The International Journal of Logistics Management. 2015; 26 (2):275-295.

Chicago/Turabian Style

Patricija Bajec; Danijela Tuljak-Suban; Evelin Krmac. 2015. "Do ISO standards favour logistics provider efficiency, competitiveness and sustainability? A Slovenian perspective." The International Journal of Logistics Management 26, no. 2: 275-295.

Journal article
Published: 01 January 2015 in IFAC-PapersOnLine
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ACS Style

Danijela Tuljak Suban; Marija Bogataj. An Optimal Ordering Cycle at Interactions of Fuzzy Parameters and High Disposal Fees of Food or Drug Supply Systems. IFAC-PapersOnLine 2015, 48, 2374 -2379.

AMA Style

Danijela Tuljak Suban, Marija Bogataj. An Optimal Ordering Cycle at Interactions of Fuzzy Parameters and High Disposal Fees of Food or Drug Supply Systems. IFAC-PapersOnLine. 2015; 48 (3):2374-2379.

Chicago/Turabian Style

Danijela Tuljak Suban; Marija Bogataj. 2015. "An Optimal Ordering Cycle at Interactions of Fuzzy Parameters and High Disposal Fees of Food or Drug Supply Systems." IFAC-PapersOnLine 48, no. 3: 2374-2379.

Original articles
Published: 03 December 2014 in Maritime Policy & Management
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Today, approximately 90% of the world’s cargo is moved by ships and almost all general cargoes are transported in containers. Worldwide container traffic has increased over the last 20 years by 7% annually, and containerization has begun to seriously impact global trade patterns. As a result, container terminals have become very important nodes in the world’s supply chain. In this article, we have highlighted the link between the total and empty container traffic and the global economy. By way of example, we have analysed the empty container traffic in north Adriatic ports in the years before and during the global economic crisis and in a period of stability after the major economic slump. We used a fuzzy multicriteria algorithm to find out how the global crisis, which has affected ports, influences the number of excess empty containers at the terminals. We show that these factors, in particular the change of the global financial and economic situation, have different repercussions to the ports of the north Adriatic: less serious effects upon the ports that are well connected locally and substantial consequences for the ports that are well connected globally.

ACS Style

Danijela Tuljak-Suban; Elen Twrdy. Fuzzy empty containers excess estimation as an economic indicator—the case of the north Adriatic port system. Maritime Policy & Management 2014, 42, 759 -775.

AMA Style

Danijela Tuljak-Suban, Elen Twrdy. Fuzzy empty containers excess estimation as an economic indicator—the case of the north Adriatic port system. Maritime Policy & Management. 2014; 42 (8):759-775.

Chicago/Turabian Style

Danijela Tuljak-Suban; Elen Twrdy. 2014. "Fuzzy empty containers excess estimation as an economic indicator—the case of the north Adriatic port system." Maritime Policy & Management 42, no. 8: 759-775.

Conference paper
Published: 20 June 2014 in 14th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION
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ACS Style

Danijela Tuljak-Suban. HOW AN APPROPRIATE QUALITY ASSESSMENT METHOD CAN IMPROVE MARITIME EDUCATION AND TRAINING PROCESSES. 14th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION 2014, 1 .

AMA Style

Danijela Tuljak-Suban. HOW AN APPROPRIATE QUALITY ASSESSMENT METHOD CAN IMPROVE MARITIME EDUCATION AND TRAINING PROCESSES. 14th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION. 2014; ():1.

Chicago/Turabian Style

Danijela Tuljak-Suban. 2014. "HOW AN APPROPRIATE QUALITY ASSESSMENT METHOD CAN IMPROVE MARITIME EDUCATION AND TRAINING PROCESSES." 14th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION , no. : 1.

Journal article
Published: 07 January 2011 in Central European Journal of Operations Research
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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.

ACS Style

Marija Bogataj; Danijela Tuljak Suban; Samo Drobne. Regression-fuzzy approach to land valuation. Central European Journal of Operations Research 2011, 19, 253 -265.

AMA Style

Marija Bogataj, Danijela Tuljak Suban, Samo Drobne. Regression-fuzzy approach to land valuation. Central European Journal of Operations Research. 2011; 19 (3):253-265.

Chicago/Turabian Style

Marija Bogataj; Danijela Tuljak Suban; Samo Drobne. 2011. "Regression-fuzzy approach to land valuation." Central European Journal of Operations Research 19, no. 3: 253-265.