1. A new sustainable warehouse management approach for workforce and activities schedulingVlado 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 influence of bookings on the company's processesLuka Miletič, 2018, bachelor thesis/paper Abstract: In the bachelor thesis we had undertaken the project of implementation of The Booking Platform in the F.A. Maik d.o.o. company. After four months (January 2017–April 2017) of observing the situation, more specificly in their central warehouse, we have designed The Booking Platform, depending on the needs and the problems, which had bothered the company. We discovered that the main problem was the overcrowding of the vehicles on the parking lot, which came to the warehouse at the same time, therefore the amount of goods that needed to be stored was too big to unload at the same time.
The main goal of the thesis was to build the system, which will improve the processes in the F.A. Maik d.o.o. company, related to the influence of time organization in the warehouse. The main aim was to do the analysis of the current situation in the warehouse, and to test the two hypotheses, how can the situation be improved with the implementation of the new system, especially to reduce the number of complaints and to provide more fluent workflow. The project that was implemented was of high value for the company, because the processes in the warehouse were very old fashioned and not automated.
The Booking Platform reduced the number of complaints to zero only two months after the implementation. In the observation time, the workflow in the warehouse improved in terms of knowing, when the vehicles are coming to the warehouse and the incoming goods can now be stored immediately, which means that the unloading ramps are now always free for new incoming goods.
Keywords: The Booking Platform, time organization, booking, complaints, fluent workflow, warehouse management
Published in DKUM: 15.10.2018; Views: 1159; Downloads: 115
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3. The value of "vehicle to grid" integration into warehouse logistics management : case of Slovenian retailerMatjaž Knez, Péter Bajor, 2011, original scientific article Abstract: Wide-scale application photovoltaic energy sources for electricity production purposes is quite a challenge in Slovenia. The nature of sun is unpredictable, and the Slovenian National Grid has no significant storage opportunities today - if the V2G (vehicle-to-grid) solutions could be competitive in the near future we could prepare for the special circumstances: the batteries of electrically driven forklifts could provide attractive storage functions for renewable electricity storage. The following paper presents an overview of some "environmental background approaches" to show the complexity of this innovative system and to show the value of V2G technology and its application in warehouse logistics.
Keywords: renewable electricity, photovoltaics, warehouse logistics management, v2G
Published in DKUM: 10.07.2015; Views: 1635; Downloads: 203
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4. Electric forklifts with vehicle to grid technology for efficient warehouse energy managementMatjaž Knez, Péter Bajor, 2012, original scientific article Abstract: From an electric utility perspective, the sun is an intermittent electrical generator, tolerable in huge quantities, but increasingly difficult to manage. The nature of sun is unpredictable, and the Slovenian National Grid has no significant storage opportunities - if the V2G (vehicle-to-grid) solutions could be competitive in the near future it could prepare for special circumstances: the batteries of electrically driven forklifts could provide attractive storage functions for renewable electricity storage and for backupping the electrical national grid. This paper shows the study of the current research findings on the ŽVehicle to Gridʼ innovative concept and a proposed theoretical model of Forklift-to-Grid integration into energy management of a warehouse. Analyses of data, calculations of the economic value and of the profitability of the proposed business model yielded positive results that fully confirm the thesis that the integration of environmentally friendly renewable energy sources and new technologies into the logistic processes can improve logistics management while minimizing the negative impact of business on the environment.
Keywords: CO2 emmisions, forklift-to-grid, photovoltaic, vehicle-to-grid, warehouse energy management
Published in DKUM: 10.07.2015; Views: 1421; Downloads: 42
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