Iskanje po katalogu digitalne knjižnice

Opis: City logistics is subject to constant development, generated by new logistics trends and high customers’ expectations. With the aim of creating an effective, acceptable, and sustainable city logistics policy, it is therefore essential to understand logistics trends and their expected impact on the development of urban freight transport in the future. In this paper, we explore and compare the expectations of public authorities, business, and academia regarding the short-, medium-, and longterm impacts of different logistics trends on urban logistics. Following a literature review, the expert survey was used to assess the expected impact and time horizon. According to the respondents, “e-commerce”, “automated vehicles”, “electric vehicles”, “grey power logistics”, “omni-channel logistics”, and the “desire for speed” will have the greatest impact on urban freight transport in the future. An interesting observation concerns some differences of opinion between public and private stakeholders. In general, the business community believes that the identified trends will have a greater impact on urban logistics in a shorter period of time, while public authorities believe that the mentioned trends will have a less strong impact on urban logistics in a longer time scale. This shows the need for more active collaboration between them in the policy-making process.
Ključne besede: logistics trends, urban freight, policy making, stakeholders’ perspective
Objavljeno v DKUM: 14.03.2025; Ogledov: 0; Prenosov: 1
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Opis: Urban freight deliveries are often subject to many access restrictions which creates the need to establish a system of loading bays and to split the last mile delivery into driving and walking parts. A new model based on hard and soft clustering approach is developed to solve the loading bay assignment problem for efficient vehicle routing and walking in last mile delivery. The flexibility of the model is provided by the soft clustering approach based on different membership degrees of customers to loading bays. Especially for instances with large numbers of loading bays, soft clustering seems to give better results, it leads to higher flexibility of city logistics systems, minimal driving distances, and adequately short walking paths, which contribute to the goal of reaching sustainable urban freight deliveries.
Ključne besede: city logistics, last-mile delivery, loading bay, facility location, fuzzy clustering, two-echelon routing problem, location-routing problem
Objavljeno v DKUM: 28.01.2025; Ogledov: 0; Prenosov: 5
Celotno besedilo (14,10 MB)
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Opis: Abstract This study examines the impact of emerging transport trends on the Western Balkans and their potential to improve the sustainability and efficiency of the transport sector in the region. In the context of global efforts to reduce environmental impacts and improve transport safety, the study aims to better understand the perspective of the business sector in order to align strategic planning for the introduction of new transport technologies and practices with the expectations of the business sector. Using a questionnaire-based survey on the Mentimeter platform, the study gathers insights from 49 transport and logistics experts. The analysis uses violin plots and heat maps to visualise the expected impact of the identified trends. The results show a consensus among the experts that the emerging trends are likely to lead to a reduction in accidents, congestion, and emissions, while at the same time increasing operating costs and investment in infrastructure. In particular, trends such as alternative fuels, electrification, and smart city initiatives are highlighted as important drivers for reducing emissions. The study concludes that while these trends are likely to lead to the achievement of environmental and safety goals, they also lead to economic challenges as operating costs increase and significant infrastructure investment is required. The study emphasises the need for strategic investment, policy adjustments, and capacity building to lead the Western Balkans towards a sustainable transport future.
Ključne besede: transport trends, congestion, accidents, infrastructure investment, operational costs, policy adaptation
Objavljeno v DKUM: 31.01.2024; Ogledov: 333; Prenosov: 45
Celotno besedilo (2,27 MB)
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Opis: Egipčani so ulomke izražali kot vsote med seboj različnih, pozitivnih enotskih ulomkov. Takšne ulomke danes imenujemo egipčanski ulomki. V magistrskem delu obravnavamo algoritme za računanje egipčanskih ulomkov, ki temeljijo na aproksimacijah, na dvojiškem sistemu, na verižnih ulomkih, na metodi majhnih števcev in na obratni požrešni metodi. V prvem delu spoznamo številske sisteme, ki so jih poznali v starodavnem Egiptu, definiramo egipčanski ulomek ter spoznamo osnove algoritmov. V drugem delu posamezne algoritme opišemo in predstavimo na primerih. Izbran algoritem udejanjimo v programskem jeziku C++.
Ključne besede: Enotski ulomek, Egipčanski ulomek, Algoritem, Požrešna metoda, Dvojiška metoda, Verižni ulomek, Obratna požrešna metoda.
Objavljeno v DKUM: 12.07.2022; Ogledov: 1081; Prenosov: 126
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Opis: Končni vzorci so najprej definirani intuitivno, kasneje pa še eksaktno (matematično). Simetrije končnih vzorcev so definirane s pomočjo izometrij ravnine. Obravnavani so štirje osnovni razredi izometrij ravnine: zrcaljenje, rotacija, translacija ter drsno zrcaljenje. V klasifikacijskem izreku je dokazano, da vsaka izometrija spada v enega od osnovnih štirih razredov. Pri obravnavi vektorjev in matrik se omejimo na ravnino in trirazsežni vektorski prostor. Dokazano je, da izometrijam ravnine s fiksno točko pripadajo natanko ortogonalne matrike. V poglavju o grupah so obravnavani pojmi: (pod)grupa, red grupe, izomorfizem grup ter generatorji grupe. Glavni rezultat je klasifikacija simetrijskih grup končnih vzorcev v ciklične ali diedrske, kar danes imenujemo Leonardov izrek. Podano je tudi nekaj informacij o zgodovinski dobi, v kateri je deloval Leonardo da Vinci in nekaterih povezavah med njegovim delom in matematiko. Učbenik je namenjen študentom arhitekture in vsebuje številne primere, rešene naloge ter obsežno slikovno gradivo.
Ključne besede: izometrija ravnine, končni vzorec, simetrija, končna grupa, Leonardov izrek
Objavljeno v DKUM: 21.12.2021; Ogledov: 1248; Prenosov: 348
Celotno besedilo (54,54 MB)
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