Morana Mihaljević

Analysis of influential factors for ultrasonic disc size evaluation

Abstract The accuracy and reliability of any ultrasonic testing depends on the calibration procedure and sensitivity settings. In the present experimental research, it has been investigated how the changes of ultrasound beam shape influence the disc size evaluation. It was investigated how three selected factors and their interactions affect the disc size evaluation when probe frequencies are changing what is in correlation with changing the ultrasound beam shape. The experiment revealed that different factors and their interactions are significant for disc size evaluation.

Simulation modelling of a company providing two qualitatively different services to market

Simulation modelling is applied onto a market dynamics of a company conducting two qualitatively different services and has a bounded total daily volume. The model contains qualitatively and in a simplified form the characteristics of the dynamics of a general service providing company. The company applies a single strategy how to influence, thus minimise, the number of agents who wait for a given service. The strategy is realised by changing the relative proportion of the daily conducted services. Rather small modification of priority level between the two services influences considerably both the number and the type of end users who wait for a particular service. The model enables the researchers to test different strategies how to control the number of end users who wait for services, by proper changes in priority level of services conducted. The fact important for practitioners is that partial optimisation is achieved through slight difference in priorities between the services. (Received in October 2015, accepted in January 2016. This paper was with the authors 1 week for 1 revision.)