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71.
Nacionalne družbe za kombinirani transport v Evropi
Ratko Zelenika, Sabina Kamnik Zebec, Nedeljko Tegeltija, 2006, polemic, discussion, commentary

Abstract: Družbe za kombinirani transport v Evropi so pomemben dejavnik, ki vpliva na razvoj in širitev kombiniranega transporta na tem področju. Interes teh družb je preusmeriti čim večji delež cestnega transporta na železnico, saj si samo na tak način družbe lahko zagotovijo obstoj na trgu. Kombinirani transport je nedvomno transport sedanjosti in prihodnosti, ki je s pomočjo družb UIRR-ja in prometne politike Evropske unije vedno bolj v uporabi.
Keywords: promet, transport, železnice, ceste, Evropa
Published: 10.07.2015; Views: 544; Downloads: 34
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72.
Computer-supported modelling of multimodal transportation networks rationalization
Ratko Zelenika, Slavomir Vukmirović, Hilmija Mujić, 2007, short scientific article

Abstract: This paper deals with issues of shaping and functioning of computer programs in the modelling and solving of multimodal transportation network problems. A methodology of an integrated use of a programming language for mathematical modelling is defined, as well as spreadsheets for the solving of complex multimodal transportation network problems. The paper contains a comparison of the partial and integral methods of solving multimodal transportation networks. The basic hypothesis set forth in this paper is that the integral method results in better multimodal transportation network rationalization effects, whereas a multimodal transportation network model based on the integral method, once built, can be used as the basis for all kinds of transportation problems within multimodal transport. As opposed to linear transport problems, multimodal transport network can assume very complex shapes. This paper contains a comparison of the partial and integral approach to transportation network solving. In the partial approach, a straight forward model of a transportation network, which can be solved through the use of the Solver computer tool within the Excel spreadsheet interface, is quite sufficient. In the solving of a multimodal transportation problem through the integral method it is necessary to apply sophisticated mathematical modelling programming languages which support the use of complex matrix functions and the processing of a vast amount of variables and limitations. The LINGO programming language is more abstract than the Excel spreadsheet, and it requires a certain programming knowledge. The definition and presentation of a problem logic within Excel, in a manner which is acceptable to computer software, is an ideal basis, for modelling in the LINGO programming language, as well as a faster and more effective implementation of the mathematical model. This paper provides proof for the fact that it is more rational to solve the problem of multimodal transportation networks by using the integral, rather than the partial method.
Keywords: intermodal transportation, transportation networks, spreadsheets, mathematical modelling, programming languages, Lingo, Solver
Published: 01.06.2017; Views: 324; Downloads: 42
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73.
Dynamic optimization in supply chains
Drago Pupavac, Jasmina Pašagić Škrinjar, Ratko Zelenika, 2007, original scientific article

Abstract: Production and stock optimization in supply chains is a complex problem because it determines the optimum quantity production in time. Due to their multileveld nature, those problems are mostly solved by different methods and models of dynamic programming. The problem discussed in this paper refers to the determination of optimum quantity of production and stocks within the supply chain in a certain period of time, as well as in each sub-interval of a period, but with the condition that the production and stock expenditure remains minimal and that the predetermined demand in every sub-interval and throughout the entire observation period remains satisfied.
Keywords: transportation, logistics, transportation networks, supply chains, optimization, dynamic programming, traffic
Published: 02.06.2017; Views: 393; Downloads: 53
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74.
Global logistic network of courier services for the 21st century
Ratko Zelenika, Sabina Kamnik Zebec, Helga Pavlić, 2006, review article

Abstract: The development of logistics has contributed a lot to all the branches of economy. A successful economic subject cannot exist without a well-developed logistic branch. The organization of logistics has become a strategic element of the policy making of enterprises. Modern logistics enables us to bring into line different interests in material flow management. Global organizers of logistic services are developing and specialising in some essential services, such as combining of cargo into assembly consignements and also their distribution. The biggest global tenderers of logictic services are considered (DHL, TNT, FEDEX, UPS, etc).
Keywords: traffic, transportation, logistics, logistic services, TNT, DHL, FEDEX, UPS, global logistic networks
Published: 02.06.2017; Views: 367; Downloads: 35
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75.
Human potentials management in transport
Drago Pupavac, Ratko Zelenika, Marinko Jurčević, 2004, short scientific article

Abstract: The paper explores the significance of human potentials management in micro and macro transport systems and investigates to what extent do the human potentials represent the factor of growth and development of transport systems. The facts gathered in this paper should represent the quantitative starting points for viewing the specifics of transport service productions and future movements on the transport labour market, and the possibilities of information technologies implementation in transport human potentials management optimizations, all with the aim of producing new and of improving the inherited comparative advantages of the Croatian transport systems.
Keywords: traffic, transport systems, human potential, labour market, information technology
Published: 02.06.2017; Views: 392; Downloads: 40
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76.
Intellectual capital - developmental resource of logistic companies for the 21st century
Ratko Zelenika, Drago Pupovac, 2003, review article

Abstract: On the basis of relevant scientific research this paper systematically and concisely elaborates the interaction between intellectual capital and logistic services production. Full attention is given to intellectual capital as a factor in effective creation of the logistic processes or in other words, to prove the statement that the first place for achieving competitive advantages in the global and/or regional market of logistic services belongs to knowledge used to produce or improve the existent logistic systems and to create new ones.Further, the paper deals with the tasks of creative logistic managers as open, dynamic and stochastic systems based on knowledge or the creation of universal logistic model determined by the fact that intellectual capital and technological paradigm create the way to new logistic paradigm.Special attention is paid to building and presenting a mathematical model for measuring the intellectual capital as well as the success of its use in different logistic companies.
Keywords: traffic, transport, logistics, developement, intellectual resources, logistic model, mathematical model
Published: 02.06.2017; Views: 247; Downloads: 46
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77.
Logistic operator - fundamental factor in rational production of services in multimodal transport
Ratko Zelenika, Drago Sever, Sabina Kamnik Zebec, Bojan Pirš, 2005, review article

Abstract: From its theoretical and practical point of view, traffic is one of the fundamental factors of the economy in a state. In the developed European countries, a rational production of transport services is presented by multimodal transport and the correct selection of a logistic operator. The aim of multimodal transport is to link together different forms of traffic in the most effective way, as well as all operations considering transport. The logistic operator is the only professional to perform complete services in multimodal transport, therefore it was necesarry to enable its further development and, in accordance with that, to suggest suitable solutions. An increase of the existing and the creation of new traffic currents can only be achieved with the development of multimodal transport, the correct selection of logistic operator and better organisation of the traffic system. In the future, the Republic of Slovenia should continue developing multimodal transport in order to decrease the differences in forms of transport in the developed European countries in the shortest time possible.The main task of the Republic of Slovenia is to integrate into the European flows as soon as possible, engage in a reciprocal cooperation by liberalization of flows of commodities and services, and create conditions for the inflow of foreign capital where all advantages of multimodal transport come into consideration. The result of the research is a model of multimodal transport logistic operator connecting the basic elements of that transport.
Keywords: logistical operator, rationalization, multimodal infrastructure, multimodal suprastructure, multimodal technologies, multimodal movement of goods, logistical information systems
Published: 02.06.2017; Views: 425; Downloads: 29
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78.
Measuring the intellectual capital of international carriers as logistic operators
Sabina Kamnik Zebec, Ratko Zelenika, Slobodan Zečević, 2007, short scientific article

Abstract: The age of knowledge has come and the enterprises present themselves as "knowledge enterprises" and their employees as sources of knowledge - "knowledge workers". Knowledge has become a merchandise, to be on the knowledge market. In an enterprise knowledge becomes the capital, important for achieving competitive advantage on the market but it cannot be measured easily. The field of intellectual capital is very complex, mostly because it is difficult to categorize it. The important concepts and definitions for intellectual capital include an emphasis that intellectual capital is based on knowledge and is usable in any enterprise. Knowledge and skills determine the possibilities of an individual to actively influence the social development and ensure their quality of life.
Keywords: enterprises, intellectual capital, tertiary logistics, balance sheet, income statement
Published: 02.06.2017; Views: 417; Downloads: 37
.pdf Full text (5,33 MB)
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79.
Model of sustainable growth and development of the cableway transport system in Slovenia
Sergej Težak, Ratko Zelenika, Drago Sever, 2011, original scientific article

Abstract: The cableway transport system is very important for the Slovenian tourist economy. Within the Slovene transport system, the cableway transport subsystem has a specific role because it allows and ensures access to regions which are difficult to access or completely inaccessible by other transport subsystems owing to the configuration of the area. The quality and development of transport services are directly linked to the introduction of new cableways. New technical achievements, which are nowadays used in cableways, all provide greater capacity and higher speed of cableways, which, however, results in their higher maintenance and exploitation costs. The cableway transport system is being developed in Slovenia, but not on principles of sustainable development. This paper presents a model of sustainable growth and development of the cableway transport system in Slovenia based on which it is possible to determine assumptions for future growth so that the Slovene cableway transport system would approach standards of such highly developed systems. The new model includes ten essential elements of this system for which growth rates were calculated.
Keywords: cableway transport system, cableways, econometrics, growth matrix, sustainbale growth, winter tourism, mountain tourist centre
Published: 05.06.2017; Views: 368; Downloads: 189
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80.
Multicriteria optimisation in logistics forwarder activities
Tanja Poletan, Alen Jugović, Ratko Zelenika, 2007, original scientific article

Abstract: Logistics forwarder, as organizer and planner of coordination and integration of all the transport and logistics chains elements, uses adequate ways and methods in the process of planning and decision-making. One of these methods analysed in this paper, which could be used in optimisation of transport and logistics processes and activities of logistics forwarder, is the multicriteria optimisation method. Using that method, in this paper is suggested model of multicriteria optimisation of logistics forwarder activities. The suggested model of optimisation is justified in keeping with method principles of multicriteria optimization, which is included in operation research methods and it represents the process of multicriteria optimization of variants. Among many different processes of multicriteria optimization, PROMETHEE (Preference Ranking OrganizationMethod for Enrichment Evaluations) and Promcalc& Gaia V. 3.2., computer program of multicriteria programming, which is based on the mentioned process, were used.
Keywords: traffic, transport, forwarding, logistic chain, planning, optimisation, PROMETHEE
Published: 05.06.2017; Views: 308; Downloads: 40
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