Global logistic network of courier services for the 21st centuryRatko Zelenika
, Sabina Kamnik Zebec
, Helga Pavlić
, 2006, pregledni znanstveni članek
Opis: 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).
Ključne besede: traffic, transportation, logistics, logistic services, TNT, DHL, FEDEX, UPS, global logistic networks
Objavljeno: 02.06.2017; Ogledov: 127; Prenosov: 9
Celotno besedilo (5,29 MB)
Freight transport innovations of European railways - new market chances and technological perspectivesStanislav Božičnik
, Konrad Schliephake
, 2005, pregledni znanstveni članek
Opis: The paper analyses the main technical and economic elements of the current European rail freight market and presents the basic concepts of possible new technologies in the rail freight system. They would enable the railways to enter the more rewarding niches of the freight transport market. In an attempt to understand better the problems of introducing innovations into the transport sector this paper also considers the theoretical framework and analyses the implementation paths of the proposed technological innovations. New technologies are confronted with various barriers and difficulties created by the existing and dominant technological paradigms. These are often powerful enough to prevent the introduction of alternatives and promising innovations. The empirical part of the paper focuses on the possibilities of combining the existing innovative rail freight technologies which could, with the appropriate organizational solutions (time-tables) and political support, increase the competitiveness of the rail freight transport in new and promising market segments.
Ključne besede: railway traffic, freight transport, combaine trasnporta, huckpack transport, rail freight vehicles, innovations
Objavljeno: 02.06.2017; Ogledov: 97; Prenosov: 3
Celotno besedilo (4,24 MB)
Dynamic optimization in supply chainsDrago Pupavac
, Jasmina Pašagić Škrinjar
, Ratko Zelenika
, 2007, izvirni znanstveni članek
Opis: 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.
Ključne besede: transportation, logistics, transportation networks, supply chains, optimization, dynamic programming, traffic
Objavljeno: 02.06.2017; Ogledov: 109; Prenosov: 5
Celotno besedilo (1,78 MB)
Dimensioning of signalized intersections in realistic urban environmentMatej Dobovšek
, Drago Sever
, 2005, pregledni znanstveni članek
Opis: It is very complex to assure the dynamics of traffic networkin urban environment because of the intensity of traffic flowsand the limited space in the urban area. Signalized intersectionsare undoubtedly very important and frequent element inroad traffic network in urban regions, which greatly influencesthe traffic flow dynamics on each section as in the whole trafficnetwork. The time (delay) a vehicle needs to drive through anintersection directly influences the travel comfort, fuel consumption,traffic pollution and so on. There are many methodsfor dimensioning signalized intersections in the world literature.One of the most applied methods is the HIGHWAY CAPACI1YMANUAL (HCM) 2000 which is based on competentinput traffic flows and other characteristics of traffic signalregulations. The intention of this paper is to establish whetherwe can use the HCM 2000 method directly in the Slovenian realenvironment. Based on the established methodology of researchand limited number of delay measurement in real environmentintersections, there have been some deviations. Thecompletion of the level of service criterion for signalized intersectionshas been proposed, with the intention for more suitabilityestimation in the realistic environment.
Ključne besede: road traffic, intersections, signallization, control delay measurement, level of service
Objavljeno: 02.06.2017; Ogledov: 150; Prenosov: 3
Celotno besedilo (2,73 MB)
Deformation analysis of bridges in exceptional transport in SloveniaRok Kamnik
, Boštjan Kovačič
, Andrej Štrukelj
, 2010, kratki znanstveni prispevek
Opis: In August 1999 an exceptional transportation of two steamers of 666 tonnes was performed from the Port of Koper to the Nuclear power plant in Krško. The transport covered a distance of about 200km and represented one of the largest exceptional transports in Slovenia ever.
Finding the best route represented one of the major issues, because the steamers had to cross more than 50 problematic sections and bridges, most of which have not been designed for such heavy loads. It was necessary to load-test almost all bridges on the route to determine whether those bridges need any extra supports or not.
Consequently, a logistic operator has an important and indispensable role and becomes a co-modeller of logistic service. A deformation analysis or a polynomial interpolation of vertical displacements could also be used. Therefore, a laboratory load test of a concrete plate was made. The concrete plate was loaded with hydraulic cylinder PZ 100 with extensiometer up to 21kN. Every increase of load by 3kN was measured with Nikon Ser 800 total station.
Ključne besede: deformation analysis, exceptional transport, bridges, Slovenia
Objavljeno: 01.06.2017; Ogledov: 134; Prenosov: 6
Celotno besedilo (925,47 KB)
Computer-supported modelling of multimodal transportation networks rationalizationRatko Zelenika
, Slavomir Vukmirović
, Hilmija Mujić
, 2007, kratki znanstveni prispevek
Opis: 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.
Ključne besede: intermodal transportation, transportation networks, spreadsheets, mathematical modelling, programming languages, Lingo, Solver
Objavljeno: 01.06.2017; Ogledov: 97; Prenosov: 4
Celotno besedilo (5,11 MB)
An approach to the safety problem of railway-road crossings in the transport systemAndrej Godec
, 2003, kratki znanstveni prispevek
Opis: The paper presents an approach to the problem of railway-road level crossings. The goal is to improve safety in the transport system network, which includes a considerable number of "inadequately protected" crossings. The single crossing, in its abstract sense, is considered to be a system consisting of four subsystems: the external world, the crossing in its strict sense of the word, the railway and the road. The system analysis of the problem is based on an exhaustive set of bibliography, listed at the end of the paper. This analysis leads to many findings and those exerting the greatest impact are selected as the basis for the synthesis. The synthesis proposes a triangle of variables: time period, critical points on the railway network and the value of the risk indicator. This simple model may include also other variables by converting relevant values. The main result is the risk indicator over the network. It can be used for various scenarios, thus enabling their mutual comparison as well as application in investment studies.
Ključne besede: varnost v železniškem prometu, transportni sistemi, cestno-železniška križanja, sistemska analiza, tveganje
Objavljeno: 01.06.2017; Ogledov: 136; Prenosov: 8
Celotno besedilo (3,68 MB)
Uporaba avtentičnih besedil pri predavanjih in vajah iz tujega strokovnega jezika na tehniških fakultetahSabina Mulej
, Tatjana Županek
, 2014, strokovni članek
Opis: Za uspešnost pri vsakem študiju je prav gotovo zelo pomembna bralna pismenost, ta pa glede na najnovejše raziskave upada. Pri slabši bralni pismenosti je na vseh ravneh izobraževanja tudi učenje oteženo in daje slabše rezultate. Da bi izboljšali bralno pismenost na tehniških fakultetah, lahko pri predavanjih in vajah iz tujega jezika stroke uvedemo delo z avtentičnimi besedili. Strokovni članki vsebujejo teme, ki so študentom zanimive in tako vzpodbujajo branje. So avtentično gradivo in so dostikrat v primerjavi z učbeniki aktualnejši, saj se stroka oziroma znanost hitro razvijata. Primerni so tako za delo z večjimi kot z manjšimi skupinami študentov. V prispevku navajava nekaj primerov uporabe člankov pri predavanjih oziroma vajah iz tujega strokovnega jezika: individualno delo, delo v parih in skupinsko delo. Delo z avtentičnimi besedili pa ne razvija samo jezikovnih kompetenc, ampak ima tudi sociološki vidik, saj spodbuja sodelovanje med študenti, kadar ti delajo v skupinah. Lektor se odloči za najprimernejšo strategijo pri obravnavi besedila oziroma kombinacijo le-teh. Pomembno je, da bralno razumevanje utrjujemo z izborom ustreznih vaj. Tematika besedil je tudi izvrstna iztočnica za govor. Pri takšnem delu pa se lahko zgodi, da bodisi zaradi prevelike skupine študentov ali zaradi dejstva, da jezikovno šibkejši študenti težje sledijo, ne dosegamo optimalnih rezultatov. Lektorji za delo izberemo takšne članke, ki so v realnem odnosu do stroke in njene vsebine. Avtentični teksti morajo študente usposobiti, da razumejo tipične oblike besedil, ki so značilne za jezik stroke in da so sposobni to znanje praktično uporabiti v podobnih situacijah. Avtentična nepredelana besedila izkazujejo vse strukturne značilnosti strokovnega jezika in omogočajo veliko možnosti predelav in prilagoditev. Isti članek lahko uporabimo v različnih okoliščinah, če pripravimo različne naloge. Za predavanja oziroma vaje so avtentična pisna besedila za določeno stroko lahko dosegljiva in jih je moč hitro posodobiti, dodati nove informacije in/ali spremeniti podatke.
Ključne besede: tuji jeziki, strokovni jezik, avtentična besedila, učne strategije, jezikovne zmožnosti, tehniške fakultete
Objavljeno: 18.05.2017; Ogledov: 155; Prenosov: 3
Celotno besedilo (689,78 KB)