Tomaž Kramberger - Academia.edu (original) (raw)

Papers by Tomaž Kramberger

Transport Problems, 2013

The paper addresses the problem of the reconstruction and allocation of delivery positions in the... more The paper addresses the problem of the reconstruction and allocation of delivery positions in the urban area. The aim is to achieve the optimal reorganization of urban freight transport in old town core in the municipality of Celje. Optimal allocation relies on optimization based on the Monte Carlo simulation and represents a first stage of a two-stage optimization approach to re-design the existing urban freight transport. The number of optimal delivery positions is required to be as minimal as possible, which can still assure a maximal service area within the prescribed radius, while keeping the minimal walking distances of delivery personnel between the nearest delivery position and the customerʼs physical location. The main issues of the used heuristic allocation algorithm and the presentation of calculated results are provided. In the near future, the calculated delivery positions are going to be used for the purpose of physical implementation in order to improve the existing d...

Tehnicki vjesnik - Technical Gazette, 2020

Tehnicki vjesnik - Technical Gazette, Oct 1, 2018

Advances in Logistics, Operations, and Management Science, 2016

This chapter deals with the development of a model to assess the contribution of IT-based logisti... more This chapter deals with the development of a model to assess the contribution of IT-based logistics solutions to sustainable logistics management. After introducing and explaining the pertinent concepts logistics management, IT-based logistics solutions and sustainability, certain conflict areas between IT and sustainability are discussed to gather relevant insights for the development of the assessment model. The balanced scorecard approach and the concept of maturity models are the main additions to determine the assessment model. The assessment model is embraced by a procedure model which includes guiding principles and success factors to look at before the assessment is executed and methods for navigating within the maturity model, managerial implications and aspects concerning the strategic alignment as subsequent discussion points. The chapter concludes with an outlook into further research and practical application as well as a conclusion.

Autori opisuju vezu logističkih problema iz svakidašnjeg života i teorije grafova

Maritime Policy & Management

Applied Sciences

The logistics sector should strive for sustainability alongside productivity by protecting its or... more The logistics sector should strive for sustainability alongside productivity by protecting its order pickers’ health and welfare. Existing storage assignment models are mainly based on the criterion of order picking time and, to a lesser extent, the human factor. In the paper, a solution to a storage assignment problem using a multi-objective model based on binary integer linear programing is presented by developing a solution that considers order picking time, energy expenditure and health risk. The Ovako Working Posture Assessment System (OWAS) method was used for health risk assessment. The downside of solely health risk-optimization is that the average order picking time increases by approximately 33% compared to solely time-optimization. Contrary to this, the developed multi-objective function emphasizing time has proven to be promising in finding a compromise between the optimal order picking time and eliminating work situations with a very-high risk for injuries. Its use incr...

Sustainability

Managing empty-container movements is one of the most challenging logistics problems in the shipp... more Managing empty-container movements is one of the most challenging logistics problems in the shipping field. With the growth of global trade imbalance, the repositioning process has become necessary, immediately after emptying a container. The main contribution of this research paper is to enrich the most frequently used methods, models, and applications in the literature, for relaxing the empty-container-repositioning problem. The article presents practices that vary between organizational policies, technical solutions, and modelling applications. A review of optimization models has been used for comparisons, based on specified criteria, such as the time frame, inputs, outputs, scale of the project, and value. Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) was applied through the online database Web of Science (WOS). It gives a comprehensive description of all the relevant published documents. On the basis of conducting a brief systematic review, future ...

Transport, 2021

A new approach for spatial modelling of transport mode choice is presented in the paper. The appr... more A new approach for spatial modelling of transport mode choice is presented in the paper. The approach tackles the problem by considering the trade-off between subjective and objective factors. To obtain mode Preference Rates (PRs) based on subjective factors, the Analytic Hierarchy Process (AHP) method is applied. The objective factors are expressed with the journey time from any point in the map to destination according to the available transport mode choice on the specific connection. The results are presented as PRs of individual transport modes. The model is validated on the conducted the survey, with students of Vienna University of Economics and Business (WU) as a target audience. Members of different target groups (age, national, employment) decide differently regarding the transport choice, so it is better to analyse them separately. The presented model can be used for the city transport planning in any urban area. It can help promote the sustainable modes of transport in th...

Povzetek V članku bodo predstavljeni osnovni pojmi in osnovne lastnosti matematičnega področja te... more Povzetek V članku bodo predstavljeni osnovni pojmi in osnovne lastnosti matematičnega področja teorije grafov. Obravnavani bodo nekateri logistični problemi, ki jih lahko rešimo s pomočjo teorije grafov. Ključne besede: graf, logistika 1 Uvod Beseda logistika se danes pogosto pojavlja v medijih, bodisi v raklamnih oglasih ali pa v različnih strokovnih člankih. Kaj je logistika? Logistika je zelo široka raziskovalna veda, ki povezuje orga-nizacijska, ekonomska, finančna informacijska, okoljevarstvena in še mnoga druga znanja v enoten sistem. Je panoga, ki obsega že pet odstotkov svetovne trgovine in postaja ena vodilnih znanstvenih ved. Logistiko bi lahko definirali kot dejavnost, ki se ukvarja z upravljanjem toka materialov od virov do porabnikov tako znotraj podjetij kot tudi med podjetji. Logistika zajema fizični pretok ma-teriala in pretok informacij od dobavitelja, preko proizvajalca in trgovca vse do končnega potrošnika. Gre za prostorske spremembe, prav tako pa tudi za skladiš...

Sustainability, 2021

The outbreak of COVID-19 caused many changes in people’s life. One of the most significant is the... more The outbreak of COVID-19 caused many changes in people’s life. One of the most significant is the travel behaviour and transport mode choice. This study focus on the changes that the inhabitants of Vienna made in their travel choices because of the virus. The same research about spatial modelling the transport mode choice of commuters in Vienna was completed in 2019 and is a topic addressed in our previous work. Based on our developed methodology, this article indicates that public transport is not a dominant transport mode choice as it was before the virus outbreak. The main result of this paper is geographically defined areas of application of individual alternatives shown on the final map of modal shift in Vienna, which could provide theoretical support for policymakers and transportation planners. For the city of Vienna, we found that the area of the city where cars are now used has increased, which certainly has a negative impact on air quality and life in the city. The advanta...

Quantitative Methods in Logistics, 2020

Journal of Airport Management, 2018

Attention in lean and green intralogistics has been increasing recently. Automated storage and re... more Attention in lean and green intralogistics has been increasing recently. Automated storage and retrieval systems that are used to buffer materials and products for a specific time period to be used later play significant role in intralogistics activities. In this study, we analyze an autonomous vehicle system known as shuttle-based storage and retrieval system (SBS/RS) in comparison with traditional crane- based system known as mini load automated storage and retrieval system (CBAS/RS). Models for throughput and energy consumption calculations have been proposed for both systems. We also present performance comparison of SBS/RS and mini-load CBAS/RS for the selected storage rack configurations and velocity profile of the selected material handling equipment. The results may serve as guidelines to warehouse designers and managers for designing new or improving existing automated warehouses.

Fakulteta za logistiko izvaja studij s kombinacijo tradicionalnega studija in studija s pomocjo t... more Fakulteta za logistiko izvaja studij s kombinacijo tradicionalnega studija in studija s pomocjo tehnologije, ki jo svetovna strokovna literatura imenuje Blended Learning, pri nas pa smo ga poimenovali Blend FL na osnovi nam lastnih njegovih prilagoditev in osmisljenja. Blend FL je dinamicni sistem za izdelavo, vzdrževanje in upravljanje elektronskih gradiv. Z njimi bomo hitreje izdelovali boljsa e-gradiva, ki bodo fleksibilna, standardizirana in prilagodljiva za vsakega posameznika. Pri izdelavi e-gradiv gre za hitrejso in sodobnejso digitalno predelavo iz Worda ali LaTeX-a v spletno stran.

Tehnicki vjesnik - Technical Gazette, 2019

Abstract. A generalization of the Chinese Postman Problem is considered, in which a linear order ... more Abstract. A generalization of the Chinese Postman Problem is considered, in which a linear order on a set of important nodes is given and the task is to traverse all edges at least once in such a way that the higher priority nodes are visited as soon as possible.

Research Anthology on Clean Energy Management and Solutions

Nowadays, there is more and more discussion about Industry 4.0. The introduction of which could r... more Nowadays, there is more and more discussion about Industry 4.0. The introduction of which could result into growing larger power consumption in a world. On the other side, some parts of Industry 4.0 can help to reduce energy consumption with the use of smart grid, internet of things, renewable energy, etc. The future of energy seems to be in the distributed energy resources (DER). The chapter presents the use of DER on the example of hospital, which are considered as the biggest consumer of energy in commercial sector. Because of important role of understanding the energy consumption, there is an emphasis on the energy modeling and analysis. The chapter provides a new approach in the modelling of energy with the discrete even simulation in which energy is presented by logistics packages, where every package presents a unit of energy. Basic analyses that can be made with the model are presented.

Research Anthology on Cross-Industry Challenges of Industry 4.0

This chapter presents a workspace redesign of a toolmaker position in a tooling industry towards ... more This chapter presents a workspace redesign of a toolmaker position in a tooling industry towards Industry 4.0. In general, the theory is lacking studies that would pinpoint concrete methodology to present the redesign of a company specific workplace in a way that would follow guidelines of the Industry 4.0 systematically. In this research, the authors have primarily focused on a digital readiness and identification of potential areas and tasks suitable for the implementation of enabling technologies. Collected data are based on the case study conducted in a tooling company. The result is a procedure to generate a systematic approach, a roadmap, towards Industry 4.0. To achieve the redesign of toolmaker's workplace, the authors combined the AS-IS state analysis and use Toolbox Industry 4.0. The effects of a redesigned process manifest in reduced laborious, repetitive manual work, errors, and toolmaker workload.