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3. Načrtovanje oskrbne verige in logistikeMatevž Obrecht, Tea Vizinger, Michał Adamczak, Piotr Cyplik, Dejan Dragan, Bojan Rosi, Rebeka Kovačič Lukman, Vasja Omahne, Bojan Rupnik, univerzitetni, visokošolski ali višješolski učbenik z recenzijo Ključne besede: oskrbovalne verige, oskrbne verige, načrtovanje, trajnostni razvoj, logistika, visokošolski učbeniki
Objavljeno v DKUM: 20.11.2024; Ogledov: 0; Prenosov: 10
 Celotno besedilo (6,47 MB)
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4. Control model for ground crew scheduling problem at small airports : case of SerbiaLena Đorđević Milutinović, Dragana Makajić-Nikolić, Slobodan Antić, Marija Živić, Andrej Lisec, 2021, izvirni znanstveni članek Opis: Present-day airline industry is quite a competitive field and crew scheduling represents one of the crucial problems due to significant impact on the airline's cost. The crew scheduling problem is based on the assignment of crew members to operate different tasks of route. The main goal of this paper is to provide an analysis and a solution to one of the biggest problems detected on a small airport in the Serbia - the problem of ground crew scheduling. The paper presents the main characteristics, goals and limitations of a real-life problem identified at this small airport. In order to solve the problem, we developed a dynamic discrete simulation model. The model is developed in a spreadsheet environment of Microsoft Excel. Some of the main limitations found in the development of the model are strong constraints and multiple goals. The model presented in the paper is designed as a useful management tool for smaller airports and is aimed at the improvement of operative processes.
Ključne besede: crew scheduling problem, modelling, air transport, small airport, management, spreadsheets
Objavljeno v DKUM: 01.10.2024; Ogledov: 0; Prenosov: 1
Celotno besedilo (1,01 MB)
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5. Dynamic discrete inventory control model with deterministic and stochastic demand in pharmaceutical distributionSlobodan Antić, Lena Djordjevic Milutinovic, Andrej Lisec, 2022, izvirni znanstveni članek Opis: This paper presents an inventory control problem in a private pharmaceutical distribution company from the Republic of Serbia. The company realizes that distribution within nine neighbouring countries and inventory control in the pharmaceutical supply chain is centralized. In order to constitute a conceptual model of the problem, we propose the modern control theory concept. The conceptual model is based on the specific practical assumptions and constraints of the supply chain. Thereafter, a dynamic discrete mathematical model of inventory control is formulated to reflect elements of the system and their relations. The model considers multiple pharmaceutical products, variable lead time, realized stochastics and deterministic demand, and different ordering policies (Lot for Lot and Fixed Order Quantity). Deterministic demand is represented as a sales forecast for each product per month, while stochastic demand is generated as a random variation of sales forecast in a range of ±20%. Two objective functions are defined as the maximization of the difference between planned average inventory level and realized average inventory level, and the minimization of stock-out situations. We develop a procedure for the determination of reorder points and the number of deliveries to achieve proposed objective functions. The model overcomes shortages of theoretically-based distribution requirements planning models and offers solutions to the limitations in inventory control practice. Real-life data, collected over two years, are used for the validation of the proposed model and the solution procedure. Numerical examples illustrate the model application and behaviour.
Ključne besede: distribution, inventory management, logistics, pharmaceutical companies
Objavljeno v DKUM: 09.08.2023; Ogledov: 456; Prenosov: 40
Celotno besedilo (3,83 MB)
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