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1.
Optimization of operations in bus company service workshops using queueing theory
Sergej Težak, Drago Sever, 2025, original scientific article

Abstract: Public transport companies are aware that the success of their operations largely depends on the proper sizing and optimization of their processes. Among the key activities are the maintenance and repair of the vehicle fleet. This paper presents the application of mathematical optimization methods from the field of operations research to improve the efficiency of service workshops for bus maintenance and repair. Based on an analysis of collected data using queueing theory, the authors assessed the current system performance and found that the queueing system still has spare capacity and could be downsized, which aligns with the company’s management goals. Specifically, the company plans to reduce the number of bus repair service stations (servers in a queueing system). The main question is whether the system will continue to function effectively after this reduction. Three specific downsizing solutions were proposed and evaluated using queueing theory methods: extending the daily operating hours of the workshops, reducing the number of arriving buses, and increasing the productivity of a service station (server). The results show that, under high system load, only those solutions that increase the productivity of individual service stations (servers) in the queueing system provide optimal outcomes. Other solutions merely result in longer queues and associated losses due to buses waiting for service, preventing them from performing their intended function and causing financial loss to the company.
Keywords: queueing theory, service workshops, buses, maintenance, traffic information transmission, public transport
Published in DKUM: 18.12.2025; Views: 0; Downloads: 2
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2.
Geometric method for solving the rope path curve for cabin deceleration in cable car station
Sergej Težak, Kristijan Cafuta, 2025, original scientific article

Abstract: In the article “New Technological Approach to Cable Car Boarding”, the authors attempted to correctly design the curve geometrically along which the rope moves through the station during the deceleration of cabins with attaching platforms in a central position, primarily intended for mass public transport. Since the suspension continuously connects the cabin and the rope during cabin deceleration, the rope moves at a constant speed along a special curve that enables the cabin to stop in the central position. This curve is symmetric with respect to the longitudinal axis of the station. However, the authors found that in the previous article presenting this cable car system, an error was made in the geometric design of the rope path curve, which the original authors were not aware of at the time. They determined that, in the presented example, a suspension length of 8 m was too short for the combination of rope speed of 5 m/s (cable car speed) and cabin deceleration of 0.5 m/s2. This article revisits this geometric problem in greater detail. The study shows that not every combination of rope speed, suspension length, and cabin deceleration in the central position functions correctly. First, the boundary conditions and spatial constraints of the rope path curve were defined. Based on the upper bound and lower bound rope path lengths, the optimal or correct shape of the rope path curve was determined geometrically. The study concludes that for a given combination of rope speed (cable car speed) and cabin deceleration, only one suspension length is suitable. In the case of a rope speed of 5 m/s and cabin deceleration of 0.5 m/s2, the correct suspension length is 16.85 m. The authors also found that the result depends on the time interval used in constructing the curve.
Keywords: cable cars, rope path curve, geometric modeling, cabin deceleration, attaching platforms, suspension length optimization, public transport, high-capacity transit
Published in DKUM: 18.12.2025; Views: 0; Downloads: 2
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3.
Vpliv pandemije na obratovanje žičniških naprav na manjših smučiščih : diplomsko delo
Benjamin Čebular, 2021, undergraduate thesis

Abstract: V diplomskem delu je predstavljena zgodovina žičniških naprav v Sloveniji. Opisana je delitev žičniških naprav, prav tako pa tudi njihovo vzdrževanje in kontrola le-teh. Podrobneje smo analizirali podatke o številu ter lokaciji žičniških naprav v Sloveniji. Ker se naloga navezuje na pandemijo ter manjša smučišča, smo obiskali manjše smučišče Janina, ga predstavili ter s predsednikom Smučarskega kluba Rogaška opravili intervju o njihovem razmišljanju glede situacije s pandemijo. Predstavljeni so podatki, pridobljeni z Ministrstva za infrastrukturo, o obratovanju žičniških naprav pri nas v času pandemije. Opisani so tudi podatki v času pred pandemijo o obratovanju naprav, ti pa so primerjani s podatki med epidemijo. Predstavljeni so tudi podatki o prepeljanih potnikih v zadnjem desetletju
Keywords: obratovanje smučišč, žičniške naprave, pandemija
Published in DKUM: 24.12.2021; Views: 841; Downloads: 59
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Izdelava orodij za ugotavljanje kakovosti po metodi direktnega merjenja (DPM) v javnem mestnem prometu Maribor : diplomsko delo
Nika Gerold, 2021, undergraduate thesis

Abstract: Javni potniški promet je ena izmed starejših oblik transporta potnikov. Da bi povečali njegovo uporabnost, moramo zagotoviti zadostno raven kakovosti storitve. V diplomskem delu smo najprej predstavili standard kakovosti, po katerem smo izdelali orodje za ugotavljanje kakovosti po metodi direktnega merjenja v mestnem prometu Maribor. Nato smo predstavili podjetje, katerega smo uporabili za preizkus naših metod merjenja kakovosit. Izdelali smo tri različne metode direktnega merjenja in jih na terenu tudi preizkusili. Predstavili smo rezultate ter opisali možnosti za preverjanje in izboljšanje kakovosti v mestnem prometu Maribor.
Keywords: kakovost, merjenje kakovosti, DPM, avtobusni promet
Published in DKUM: 03.05.2021; Views: 930; Downloads: 61
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6.
Prometne in logistične karakteristike dostopne žičnice Žekovec na smučišče Golte
Aljaž Paulič, 2018, undergraduate thesis

Abstract: Diplomsko delo obravnava tematiko prometne in logistične karakteristike dostopne žičnice Žekovec na smučišče Golte. Tema dela se osredotoča predvsem na opis prometnih in logističnih karakteristik nihalke z izračunom kapacitete žičniških naprav na Golteh in izračunom potrebnega števila parkirnih mest pri spodnji postaji nihalke. Podati želimo predloge in ukrepe za izboljšave na obstoječi infrastrukturi in primerjati nihalno žičnico s krožno kabinsko žičnico. Diplomsko delo je sestavljeno iz teoretičnega in praktičnega dela. V teoretičnem delu so v prvih štirih poglavjih opisana področja, ki morajo biti razjasnjena, preden se pobliže pogleda samo analizo trenutnega stanja. Predstavljena je zgodovina in razvoj smučarskega centra, delitev in razvoj žičniških naprav ter podrobneje opisana nihalka Žekovec z vsemi tehničnimi in ostalimi karakteristikami. V analizi stanja so opravljene meritve parkirišč in podano število le-teh. Opravljeni so izračuni kapacitet smučarskih prog in žičniških naprav, saj iz tega lahko ugotovimo število potrebnih parkirnih mest. V analizo je zajeta spodnja in zgornja postaja nihalke ter podana primerjava nihalke in krožno kabinske žičnice.
Keywords: prometno inženirstvo, žičniške naprave, kapaciteta smučarskega centra, parkirišča
Published in DKUM: 27.09.2018; Views: 1324; Downloads: 208
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7.
Robert Bartini and his contribution to the development of transport and aviation
Sergej Težak, 2017, published scientific conference contribution

Keywords: public transport, aviation
Published in DKUM: 14.11.2017; Views: 1493; Downloads: 425
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8.
Reliability analysis of operation for cableways by FTA (fault tree analysis) method
Sergej Težak, Zdravko Toš, Ivo Jurić, 2010, original scientific article

Abstract: This paper examines the reliability of the operation of cableway systems in Slovenia, which has major impact on the quality of service in the mountain tourism, mainly in wintertime. Different types of cableway installations in Slovenia were captured in a sample and fault tree analysis (FTA) was made on the basis of the obtained data. The paper presents the results of the analysis. With these results it is possible to determine the probability of faults of different types of cableways, which types of faults have the greatest impact on the termination of operation, which components of cableways fail most, what is the impact of age of cableways on the occurrence of the faults. Finally, an attempt was made to find if occurrence of faults on individual cableway installation has also impact on traffic on this cableway due to reduced quality of service.
Keywords: service quality, reliability, fault tree analysis, faults, quality, ski-tows, chairlifts, aerial ropeways, cableways
Published in DKUM: 05.06.2017; Views: 1761; Downloads: 570
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9.
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 in DKUM: 05.06.2017; Views: 1542; Downloads: 476
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10.
Influence of modern cableways on the development of mountain tourist centres
Sergej Težak, Ivan Mavrin, Ivo Jurić, 2005, other scientific articles

Abstract: The paper studies the problem of constructing cableways with advanced technology and their influence on the operation and development of cableway companies from several aspects. Modern cableways with detachable grips enable faster carriage of passengers. They have the possibility of transporting more passengers over the same distances. Recently, this trend of introducing modern cableways has been particularly present in chairlifts which carry skiers. Such chairlifts with detachable grips allow transport of skiers over greater distances and therefore must have respective ski slopes covering wider areas which in turn affects the expansion of the mountain tourist centres. The chairlifts with detachable grips require more knowledge and personnel to manage and maintain them, as well as more investment capital.
Keywords: cableways, grips, skiing, ski slopes, winter tourism, mountain tourist centres
Published in DKUM: 02.06.2017; Views: 1195; Downloads: 265
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