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1.
A new sustainable warehouse management approach for workforce and activities scheduling
Vlado Popović, Milorad J. Kilibarda, Milan Andrejić, Borut Jereb, Dejan Dragan, 2021, original scientific article

Abstract: Sustainable engineering is very important for logistics systems. Nowadays, sustainable warehouse management is a key factor in market success. Workforce fluctuation and inverting the number of customers' demands make a lot of problems in distribution warehouses. This study addresses a sustainable approach for the workforce scheduling problem recognized in a real distribution warehouse. The problem arises from the high variability of demand for workers over oneworkday, which causes workforce surplus in some periods of the workday and shortages in others. Engineering managers of the distribution warehouse already use different full-time and part-timeshifts, and schedule workers on different activities, but they still have significant workforce surplusesor shortages in some periods. This study proposes the scheduling of activities' execution together with workers to face that variability and decrease the cost of the workforce. This idea comes from the fact that some activities in a distribution warehouse can be done in a specific time period after the need for them occurs. In this way, the variability of demand for workers can be decreased, and alower workforce cost may be ensured. Based on this idea, the entire problem is modeled as integer linear programming. The real example of the problem is solved, and the proposed model is tested on randomly generated instances of the problem in Python by means of the PuLP linear programming package. The results indicate different positive effects in the manner of sustainable warehouse management: lower workforce costs, time savings, better utilization of all types of resources andequipment, increased employee satisfaction, and so on. For even 61% of instances of the introduced problem, the obtained cost of the workforce is lower by more than 20% if activities' executions arescheduled together with employees.
Keywords: workforce, activities planning, schedule, optimization, warehouses, sustainable warehouse management, logistics
Published in DKUM: 11.10.2024; Views: 0; Downloads: 5
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2.
The trans European railway network : three levels of services for the passengers
Milan Janić, 1996, original scientific article

Abstract: The paper deals with the concept, analysis and measuring of the quality of services offered by the Trans European Railway Network (TERN). A sub-network serving the passengers travelling over the EU (European Union) and some of the non-EU regions are considered. Two sets of network attributes influencing the quality of services are analysed. One set of network physical attributes is represented by the length of the rail lines connecting specific origins and destinations of the passengers. The other set is represented by the time-based attributes used to measure the quality of services offered to the users. These are: travel speeds along particular lines (routes), and how the passenger's schedule delays depend on the train frequencies (e.g. number of trains offered on particular routes of the network in a given period of time). Considered as a common entity these attributes significantly influence the average passenger's travel time (and speed) which, together with out-of-pocket cost paid for travel, have appeared to be the most important criteria influencing the choice of transport mode.
Keywords: Trans European Railway Network, passenger transport, quality of services, travel speed, schedule day
Published in DKUM: 05.06.2012; Views: 2516; Downloads: 36
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