Browsing by Author "Ďutková, Silvia"

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Cost Analysis of Queuing System of Postal Office
(University of Zilina, 2019) Ďutková, Silvia; Hoštáková, Dominika; Turská, Stanislava; Kurotová, Jana; Droźdiel, Paweł
The paper displays cost analysis of queuing system of particular post office. The selected Post Office is Zilina 1 Post Office in Slovakia. Post office Zilina 1 provides service to almost 4 000 companies and 13 559 households. [1] This paper considers two types of costs. There are costs of services which are associated with increasing or decreasing system capacity. Additional costs are the costs of rejected customers which are costs associated with deciding customers to leave the post office. Aim of this article to indicate the methodology of costs allocation of queuing system of post office and display the costs calculation method of rejected customers. Primary research using the questionnaire and the simulation method proved to be an appropriate tool in this analysis. The results of this paper show the need to take into account the substitutability of the individual services provided at the post office and the repeated arrival of the rejected customer. In the case that a rejected customer requests a service provided also by other postal operators, the post office can deal with loss of customer.
Determination of probability distribution of customer input at post office
(University of Zilina, 2017) Ďutková, Silvia; Hoštáková, Dominika; Mišík, Tomáš; Rybicka, Iwona
If we want to analyze a real system with a large number of input data, it is very convenient to determine a probability distribution that best fits to given input data. There are many statistical methods to determine the correct probability distribution and one of them is Chi-Square Goodness of Fit Test. This statistical test can be also used to find out a probability distribution of time intervals between arrivals of customers at post office. Intervals between arrivals of customers occur in continuous time and therefore we consider continuous probable distributions.
Identification of the criteria determining the attractiveness of post offices in city Zilina
(University of Zilina, 2018) Hoštáková, Dominika; Madleňák, Radovan; Ďutková, Silvia; Fúrová, Lucia; Droździel, Paweł
Customer´s preferences in the choice of a particular device is in many cases due to the attractiveness of this device. This means that customers are willing to travel longer distances to larger business centres with higher attractiveness. This is also the case for postal offices. Because postal operators are trying to maintain their customers, they also have to respond to these criteria that determine the attractiveness of the device providing of the required postal services. However, the attractiveness of the device can be perceived differently by customers. Therefore, the aim of the article is to find out these attractiveness criteria for individual post office customers, which in the future can help in selecting sites for the next postcreation or revocation of an existing mail.