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Dr. Patricija Bajec
University of Ljubljana, Faculty of Maritime Studies and Transportation

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Research Keywords & Expertise

0 Distribution Logistics
0 Sustainable logistics
0 supply chain and logistics
0 optimisation of distribution centres
0 city-logistics

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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: 09 July 2020 in Promet - Traffic&Transportation
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To improve the supply chain performance in all three aspects of sustainability (social, economic, and environmental), a comprehensive sustainable performance measurement system that captures all the supply chain partners’ efforts and commitments is required. Warehouse, as the second largest logistics source of environmental pollution in the supply chain has been almost completely overlooked and ignored in the past studies. To fill this gap, a warehouse performance metrics framework for environmental and social performance measures was proposed using a novel Fuzzy Delphi and Best-worst methodological approach. The method is less time-consuming than the Analytic Hierarchy Process or Analytic Network Process, it does not address whether criteria are dependent or independent, requires fewer comparisons of criteria, but still produces reliable and credible results. The presented framework consists of 32 equally formulated environmental and social performance indicators, including formulas and measurement units. The 14 most important indicators are ranked according to the requirements of different stakeholders.

ACS Style

Patricija Bajec; Danijela Tuljak-Suban; Ivona Bajor. A Warehouse Social and Environmental Performance Metrics Framework. Promet - Traffic&Transportation 2020, 32, 513 -526.

AMA Style

Patricija Bajec, Danijela Tuljak-Suban, Ivona Bajor. A Warehouse Social and Environmental Performance Metrics Framework. Promet - Traffic&Transportation. 2020; 32 (4):513-526.

Chicago/Turabian Style

Patricija Bajec; Danijela Tuljak-Suban; Ivona Bajor. 2020. "A Warehouse Social and Environmental Performance Metrics Framework." Promet - Traffic&Transportation 32, no. 4: 513-526.

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.

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: 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: 01 September 2013 in Transport
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Traditional outsourcing of logistics services has become an important tool for the Slovenian logistics and business market. It not only brings many benefits mainly in terms of cost reduction and focuses on core competencies, but also many shortcomings regarding business flexibility improvement and innovation development. As an increasingly competitive environment increases shipper's expectations, more innovative ways of outsourcing are needed, which would improve their flexibility and level of differentiation in order to capture greater market share. This indeed represents a departure from standard solutions and requires implementation of intelligent logistics solutions. Therefore, Slovenian logistics service providers face new challenges. The aim of this study is to examine the possibility of developing intelligent logistics outsourcing in Slovenia, and propose a method of planning and carrying out outsourcing, which will be advanced, and will bring benefits to both sides. For this reason, a general model of intelligent logistics outsourcing was developed based on a literature review of intelligent logistics outsourcing and a survey of the outsourcing market in Slovenia. According to our survey, Slovenian logistics providers are not mature enough for more intelligent means yet. Therefore, some suggestion that will significantly help and additionally motivate logistics service providers to use an intelligent logistics outsourcing model in order to offer more innovative solutions, as well as capture a greater market share were proposed. Using this model and these suggestions, it would be possible to create solutions in favour of intelligent outsourcing in Slovenia.

ACS Style

Patricija Bajec. The possibility of developing intelligent logistics outsourcing in Slovenia. Transport 2013, 28, 244 -255.

AMA Style

Patricija Bajec. The possibility of developing intelligent logistics outsourcing in Slovenia. Transport. 2013; 28 (3):244-255.

Chicago/Turabian Style

Patricija Bajec. 2013. "The possibility of developing intelligent logistics outsourcing in Slovenia." Transport 28, no. 3: 244-255.