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1.
Analytical travel time models for multi aisle automated storage and retrieval systems
Tone Lerher, Matjaž Šraml, Janez Kramberger, Iztok Potrč, Matej Borovinšek, Blaž Zmazek, 2005, izvirni znanstveni članek

Opis: Multi aisle automated storage and retrieval systems correspond to multiple picking aisles served by a single storage and retrieval machine. These systemsare used in practice when the need for pallet places is high and the throughput capacity is relatively low. Therefore, considerable savings of initial investment costs due to single aisle systems can be achieved using such systems. The objective of the presented study is to develop analytical travel time models for multi aisle automated storage and retrieval systems considering the operating characteristics of the storage and retrieval machine. With the proposed analytical travel time models, average travel time of the storage and retrieval machine, from which the performance of multi aisle automated storage and retrieval systems can be evaluated is determined. A simulation model of multi aisle automated storage and retrieval systems was developed to compare the performances of the proposed analytical travel time models. An example of multi aisle automated storage and retrieval systems withfive picking aisles was presented for the evaluation purpose. The results show that proposed analytical travel time models perform satisfactory according to the results of simulation analysis and could be very useful toolsfor designing of multi aisle automated storage and retrieval systems in real-world applications.
Ključne besede: warehousing, logistics, high rack storage, simulations, travel time models
Objavljeno: 01.06.2012; Ogledov: 1424; Prenosov: 62
URL Povezava na celotno besedilo

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The trans European railway network : three levels of services for the passengers
Milan Janić, 1996, izvirni znanstveni članek

Opis: The paper deals with the concept, analysis and measuring of the quality of services offered by the Trans European Railway Network (TERN). A sub-network serving the passengers travelling over the EU (European Union) and some of the non-EU regions are considered. Two sets of network attributes influencing the quality of services are analysed. One set of network physical attributes is represented by the length of the rail lines connecting specific origins and destinations of the passengers. The other set is represented by the time-based attributes used to measure the quality of services offered to the users. These are: travel speeds along particular lines (routes), and how the passenger's schedule delays depend on the train frequencies (e.g. number of trains offered on particular routes of the network in a given period of time). Considered as a common entity these attributes significantly influence the average passenger's travel time (and speed) which, together with out-of-pocket cost paid for travel, have appeared to be the most important criteria influencing the choice of transport mode.
Ključne besede: Trans European Railway Network, passenger transport, quality of services, travel speed, schedule day
Objavljeno: 05.06.2012; Ogledov: 1328; Prenosov: 17
URL Povezava na celotno besedilo

4.
THE SCIENCE BEHIND THE IDEAS OF STEPHEN BAXTER'S AND ARTHUR C. CLARKE'S TRILOGY A TIME ODYSSEY
Aleš Šopinger, 2013, diplomsko delo

Opis: Science and science fiction as well as the ideas that are used by them are interconnected, yet, while science tries to dismiss or confirm certain ideas, science fiction uses these same ideas as substance for their stories. With the advances in science, it is possible to that some ideas move from the realm of science fiction and become science fact. In the trilogy A Time Odyssey, co-authored by Stephen Baxter and Arthur C. Clarke, we can also find ideas and assumptions that are a part of the realm of science fiction as well as science. A comparison was made between what was written in A Time Odyssey and the view of contemporary science, concerning the ideas and assumptions about the existence of alien life, time travel, and parallel worlds. The comparison showed that the mentioned ideas are a part of science fiction as well as the scientific world, because science is putting a lot of effort in devising mathematical models and theories to dismiss or confirm the ideas that life could exists outside planet Earth, that time travel could be possible, and that parallel worlds could exist, but yet need to be proven.
Ključne besede: science fiction, time travel, alien life, dimensions, science, A Time Odyssey, advancement, technology
Objavljeno: 10.10.2013; Ogledov: 1104; Prenosov: 92
.pdf Celotno besedilo (287,91 KB)

5.
Odgovornost letalskega prevoznika za zamudo - analiza odločitev Sodišča EU
Frane Krpina, 2015, diplomsko delo

Opis: Diplomska naloga analizira sodne odločbe in sicer tiste, katere je sprejelo Sodišče Evropske Unije in s katerimi je odgovorilo na zastavljena vprašanja nacionalnih sodišč v zvezi z razlago določb in s tem pravnih pojmov Uredbe 261/2004. Sodišča so tista, ki prek sodne prakse skrbijo, da pravo sledi svojemu namenu in da popravi napake, ki so nastale pri sestavi omenjenih aktov. S sodnimi odločbami je sodišče Evropske Unije podalo novo razlago določbam Uredbe 261/2004 in s tem onemogočilo nacionalnim sodiščem, da bi interpretirala določbe po svoje. Dokončno je tudi potrdilo, da akti Evropske skupnosti, ki so namenjeni varovanju potnikov niso v nasprotju z Montrealsko konvencijo in da je potrebno dosledno spoštovati pravna načela. Potnikom je bilo z eno pomembnejših sodnih odločb omogočeno zahtevati oziroma uveljavljati pravico do odškodnine v primeru, da je bil potnikov let odpovedan ali pa da je prišlo do velike zamude, tj. tiste, ki je daljša od treh ur. Vse to pa bi bilo težko dokazati, če ne bi Sodišče Evropske Unije podalo razlago pojma »čas prihoda«.
Ključne besede: Montrealska konvencija, Uredba (ES) 261/2004, zamuda leta, odškodnina, čas prihoda, zadeva Sturgeon, zadeva IATA in ELFAA, zadeva Nelson, zadeva TUI Travel, zadeva Germanwings, zadeva Folkerts.
Objavljeno: 16.05.2016; Ogledov: 476; Prenosov: 90
.pdf Celotno besedilo (310,22 KB)

6.
Integration of travel agencies with other supply chain members
Darja Topolšek, Dejan Dragan, 2016, izvirni znanstveni članek

Opis: The performance of tourism supply chains depends on the efficiency of all members involved, including the travel agencies. The paper addresses the analysis of relationships between the agencies' external integration with other supply chain members on one side, and the efficiency of the agencies on the other. The data envelopment analysis is applied for the estimation of efficiencies, while the structural equation modelling (SEM) is conducted for identification of possible integration impacts on the efficiency. Results show that integration with other supply chain members indeed has some positive impacts on the agencies' efficiency. Also, the developed SEM model implies that in-depth forms of collaboration would enable more effective exploitation of the identified relations between the integration and efficiency of the agencies. This finding could be an important guideline for the agencies' management in the sense of achieving more satisfied customers and bigger profits, as well as reduced operational costs.
Ključne besede: tourism sector, supply chains, structural equation modeling, external integration, efficiency, travel agencies, logistics
Objavljeno: 03.04.2017; Ogledov: 265; Prenosov: 46
.pdf Celotno besedilo (1,40 MB)
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7.
Tourism sector, travel agencies, and transport suppliers
Nataša Kovačić, Darja Topolšek, Dejan Dragan, 2015, izvirni znanstveni članek

Opis: The paper addresses the effect of external integration (EI) with transport suppliers on the efficiency of travel agencies in the tourism sector supply chains. The main aim is the comparison of different estimation methods used in the structural equation modeling (SEM), applied to discover possible relationships between EIs and efficiencies. The latter are calculated by the means of data envelopment analysis (DEA). While designing the structural equation model, the exploratory and confirmatory factor analyses are also used as preliminary statistical procedures. For the estimation of parameters of SEM model, three different methods are explained, analyzed and compared: maximum likelihood (ML) method, Bayesian Markov Chain Monte Carlo (BMCMC) method, and unweighted least squares (ULS) method. The study reveals that all estimation methods calculate comparable estimated parameters. The results also give an evidence of good model fit performance. Besides, the research confirms that the amplified external integration with transport providers leads to increased efficiency of travel agencies, which might be a very interesting finding for the operational management.
Ključne besede: tourism sector, structural equation modeling, estimation methods, external integration, efficiency, travel agencies, logistics
Objavljeno: 03.04.2017; Ogledov: 344; Prenosov: 90
.pdf Celotno besedilo (1,13 MB)
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8.
Understanding the structural complexity of induced travel demand in decision-making
Juan Angarita-Zapata, Jorge Parra-Valencia, Hugo Andrade-Sosa, 2016, izvirni znanstveni članek

Opis: Background and purpose: Induced travel demand (ITD) is a phenomenon where road construction increases vehicles’ kilometers traveled. It has been approached with econometric models that use elasticities as measure to estimate how much travel demand can be induced by new roads. However, there is a lack of “white-box” models with causal hypotheses that explain the structural complexity underlying this phenomenon. We propose a system dynamics model based on a feedback mechanism to explain structurally ITD. Methodology: A system dynamics methodology was selected to model and simulate ITD. First, a causal loop diagram is proposed to describe the ITD structure in terms of feedback loops. Then a stock-flows diagram is formulated to allow computer simulation. Finally, simulations are run to show the quantitative temporal evolution of the model built. Results: The simulation results show how new roads in the short term induce more kilometers traveled by vehicles already in use; meanwhile, in the medium-term, new traffic is generated. These new car drivers appear when better flow conditions coming from new roads increase attractiveness of car use. More cars added to vehicles already in use produce new traffic congestion, and high travel speeds provided by roads built are absorbed by ITD effects. Conclusion: We concluded that approaching ITD with a systemic perspective allows for identifying leverage points that contribute to design comprehensive policies aimed to cope with ITD. In this sense, the model supports decision- making processes in urban contexts wherein it is still necessary for road construction to guarantee connectivity, such as the case of developing countries.
Ključne besede: induced travel demand, system dynamics, decision-making, dynamic modeling
Objavljeno: 23.01.2018; Ogledov: 313; Prenosov: 39
.pdf Celotno besedilo (1,96 MB)
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