Yaşar University

About: Yaşar University is a education organization based out in Izmir, Turkey. It is known for research contribution in the topics: Exergy & Job shop scheduling. The organization has 760 authors who have published 1436 publications receiving 20813 citations. The organization is also known as: Yaşar Üniversitesi.

Pipe failure rate prediction in water distribution networks using multivariate adaptive regression splines and random forest techniques

Abstract: This paper presents the results of a comparison between multivariate adaptive regression splines (MARS) and random forest (RF) techniques in pipe failure prediction in two water distribution networ...

Trip Allocation and Stacking Policies at a Container Terminal

Abstract: There are three crucial resources at container terminals; the yard, cranes and the vehicles. The main objective of the terminal is the efficient use of these resources while performing different operations. The yard is a temporary storage area where containers remain until transported to their next location by truck, train or vessel. Containers are stacked on top of each other in order to utilize the yard space efficiently. However, stacking cranes can only directly access those containers at the top of the stack. As a result, reshuffling/shifting occurs, defined as an unproductive move of a container required to access another container stored underneath. We focus on increasing the efficiency of the yard via consideration of the container stacking optimization problem for transshipment, inbound and outbound containers at a container terminal. The objective of the problem is to minimize container storage and retrieval times through avoidance of reshuffles, resulting in more efficient loading/unloading operations, and in turn minimizing the dwell time of containers. The main inputs are the type, weight, discharge port/location, destined vessel/vehicle of the container, and the expected departure time. Different stacking policies are proposed in this study, and we also investigate the problem of allocating the transit container to outbound vessels to minimize dwell time at the terminal. Transit containers require multiple sea-trips to reach their final destination. Vessels departing from the terminal and destined for the same port may provide exchangeable trips for this type of container, based on their several attributes and capacity restrictions. We consider this problem taking into account several factors that affect container/trip allocation decisions. The solution of this problem also has implications for the stacking problem.

Festival motivators and consequences: a case of Efes Pilsen Blues Festival, Turkey.

Abstract: Festivals and other events are considered important attractions by destination marketers for selection of the destination by prospective tourists. In fact, special events have proved to be a suitable way for achieving visibility and building reputation for destinations. In addition to playing an important role in promoting the destination and enhancing the image, events have various other advantages. In this regard, the pull factors of an event should meet the push factors of festival-goers to be considered in the decision-making process. Thus, it is vital to understand the motives of attendees when designing better products and services as they are closely linked to satisfaction, which is a crucial ingredient in understanding the decision-making process of festival-goers. The present study focuses on the relationship between motivation, festival performance, and satisfaction/loyalty of festival visitors by means of SEM analysis.

The maximum principle for the nonlinear stochastic optimal control problem of switching systems

Abstract: The aim of this paper is to present a stochastic maximum principle for an optimal control problem of switching systems. It presents necessary conditions of optimality in the form of a maximum principle for stochastic switching systems, in which the dynamic of the constituent processes takes the form of stochastic differential equations. The restrictions on transitions for the system are described through equality constraints.

The attitudes of entrepreneurs of the small and medium-sized enterprises sector in Poland to key business risks

Abstract: Research background: The risk management process is a key element in running a business. Moreover, it is basically one of the basic and most important internal processes in any company, regardless of its size. However, due to the extremely important role played by small and medium-sized enterprises in the economy, the problem of proper management of endogenous and exogenous risks becomes particularly important. Purpose of the article: The article aims to show the importance of risk management in the operations of modern enterprises in the SMEs sector and the attitudes of entrepreneurs towards key business risks. Methods: The research was based on data on 332 enterprises from the SMEs sector operating in Poland. The data was collected using the CSAQ method in the period from 12 of November 2019 to 9 of March 2020. The distribution of risk assessment in the studies was analysed using Tau Kendall statistics, while the risk management index was created by examining the attitudes of entrepreneurs towards individual risk factors. Findings & Value added: The results of the survey showed that three-quarters of enterprises did not manage risk in a formalized way and that decision-makers in enterprises often paid too little attention to the issues related to managing different types of risk. The article should, therefore, draw the attention of managers to the need to build appropriate procedures to enable effective risk management that creates opportunities for the safe operation of the enterprise. The added value of the work is a detailed analysis of the management of individual types of endogenous and exogenous risks, as well as an indication of what features of enterprises affect the effectiveness of actions taken in the field of controlling these risks. Research is valuable because of the small amount of studies that links managers' approaches to risk management with actual risk management effectiveness.