Lidé na fakultě
Ing. Andrea Hrníčková

2024, Proceedings of the International Scientific Conference, Bratislava, Vydavateľstvo EKONÓM), p. 91-98), ISBN 978-80-225-5144-1

Electricity is one of the most important raw materials that fundamentally affect our daily functioning. Since 2002, the Czech Republic has transformed its electricity market, culminating in 2006 with the possibility for households to choose their supplier and product. In the following years, other suppliers entered the market and electricity production using solar cells on houses or industrial buildings slowly became popular. This option can cover household consumption, especially during summer days, and even generate surpluses that suppliers are obliged to buy and distribute through their grid. The energy market has been dealt a big blow by events in the world, particularly in 2022, which have caused, among other things, large fluctuations in electricity prices. All of these aspects have a major impact on household electricity costs and it is therefore important to choose the best (cheapest) product from the large number of products on offer. In this paper, we consider the choice of product from an electricity supplier in dual tariff rate D25d (for households) using a simulation model. For this tariff, data for 70 different products for each of the three distribution regions in the Czech Republic (Liberec region, South Bohemia region and Prague) for the year 2023 was obtained from a web-based calculator.

Stať ve sborníku z mezinár. konf.

2023, Proceedings of the 41st International Conference on Mathematical Methods in Economics, Praha, Česká společnost pro operační výzkum), p. 123-128), ISBN 978-80-11-04132-8, ISSN 2788-3965

There are various types of warehouses in the logistics chain, one of them are production warehouses. These are warehouses, which storage capacity is used to complete product processes before shipping to the customer or to homogenize the qualitative parameters of the material before processing. This process is called refinement. Typical examples of products that go through the refining process can be found in the food and chemical industry, especially fermentation processes in brewing and distilling, or stabilizing chemical processes in cosmetology. These products usually require transportation to the production warehouse immediately after production, where take place storage with a refining process while observing specific, predefined conditions (for example, a certain temperature or humidity in the warehouse). In these conditions, the products must spend the minimum required time, and in most cases the stay in the warehouse must not exceed the maximum defined time, otherwise the final product could deteriorate. These mentioned factors affect not only the quality of the product, but also the financial complexity of the entire process. This paper deals with the application of the linear programming method for the purpose of optimizing the total costs of production, synchronous warehousing process with the refining process and dispatching finished products to customer using a heterogeneous vehicle fleet.

Stať ve sborníku z mezinár. konf. cizojazyčně

2023, Proceedings of the 15 th International Conference on Strategic Management and its Support by Information Systems 2023, Ostrava, VŠB – Technical University of Ostrava, Faculty of Economics), p. 121-130), ISBN 978-80-248-4687-3, ISSN 2570-5776

Storage is one of the many processes that take place within logistics chains. It is a process that primarily generates costs, which is why is important to monitor its going regularly and optimize it if necessary. During optimization, various tasks formulated by one or more optimization criteria are pursued. In the presented paper, two parallel tasks are pursued, which do not occur so often, but which are significant from the point of view of practical applications. The first task is the most efficient utilization of storage space capacity. The second task is to consider the amount of bound capital in the stocks. Based on the defined inputs, three optimization approaches based on mathematical programming suitable for solving the formulated problem are presented in this paper. At the end of this paper, the results of each individual optimization approach are compared with each other, and recommendations for the client are formulated.

Stať ve sborníku z prestižní konf. (Scopus)

2023, Proceedings of the 15th International Scientific Conference COMPETITION, Jihlava, Vysoká škola polytechnická Jihlava), p. 180-190), ISBN 978-80-88064-71-8, ISSN 2788-0605

Rozsah a kvalita dopravní infrastruktury má signifikantní dopad na rozvoj společnosti a kvalitu života, zejména pak v oblasti ekonomického rozvoje a zvýšení konkurenceschopnosti. Pro dosažení těchto efektů je třeba investovat značné finanční prostředky do výstavby a modernizace formou realizace investičních projektů dopravní infrastruktury. Výše prostředků určených pro tyto investiční projekty je však zpravidla nižší než náklady na realizaci všech připravovaných staveb, a proto je nutné přistupovat k výběru pouze některých investičních projektů k jejich následné realizaci. Tento výběr musí probíhat tak, aby realizované investiční projekty splňovaly požadavky definované dopravní politikou a pravidly investičních fondů, kde přínosy projektů jsou reprezentovány definovanými indikátory. Za účelem nalezení vyhovujícího rozdělení plnění indikátorů je potom v praktických úlohách často opakováno řešení výběru portfolia se změnou vstupních podmínek. Cílem příspěvku je prezentace možnosti optimalizace portfolia investičních projektů dopravní infrastruktury pomocí přístupu založeného na agregaci optimalizačních kritérií v kombinaci s transformací části optimalizačního kritéria na omezující podmínky. Pomocí tohoto postupu je umožněno zadavateli ovlivnit plnění sledovaných indikátorů apriorními i aposteriorními preferenčními požadavky za účelem dosažení požadovaného rozložení.

Stať ve sborníku z mezinár. konf. česky

2022, MME2022 : Proceedings of the 40th International Conference on Mathematical Methods in Economics, Jihlava, Vysoká škola polytechnická Jihlava), p. 129-134), ISBN 978-80-88064-62-6

An important group of operations taking place in distribution parts of logistics chains is the completion of consignments. It is usually necessary to decide in which warehouse the completion of consignments will take place if distribution systems contain several warehouses. The decision of the place of completion is influenced by location of the required items in individual warehouses and by quantity of the required items in the warehouses. The presented paper deals with the problem of location of multiple completion centres with limited capacity in the conditions of a distribution system containing several warehouses, with stored items divided into several size categories. It is possible to store items of the same size in several warehouses and a vehicle fleet is heterogeneous. The problem is conceived as an optimization problem, which is solved by the methods of mathematical programming. When creating a mathematical model, the knowledge from the field of transport and location tasks is used. A computational experiment will be performed with the proposed model, and it will be performed for several numbers of warehouses to be completion.

Stať ve sborníku z prestižní konf.

2022, QUANTITATIVE METHODS IN ECONOMICS (Multiple Criteria Decision Making XXI), Bratislava-Nové Mesto, Letra Edu), p. 76-81), ISBN 978-80-89962-93-8

Distribution of goods to the final customer is the last link in the logistics chain. This is a topical and important issue, as the efficiency of the distribution processes can have a significant positive effect on the economy of the whole chain. The processes taking place in the parts of the logistics chains dealing with the distribution of goods can be of a different nature. The reasons for the different nature of processes may be specific requirements for the process of completion of goods before final shipment, specific requirements for the final shipment process depending on the type of goods removed, end customer service technology resulting from their specific requirements for delivery dates, number of units, periodicity of service, etc. The presented article deals with the task of selecting the distribution warehouse of the final shipment in the conditions of a distributor with whom orders are placed electronically (in virtual reality). The problem is conceived as an optimization problem, which is solved by methods of mathematical programming. The optimization criterion is the cost of completing customer orders. When creating a mathematical model, knowledge from the field of transport and location tasks is used. Computational experiments will be performed with the proposed model. Computational experiments will be performed for different numbers of warehouses, while only one of them will be designated for the final shipment.

Stať ve sborníku z prestižní konf.