In this paper, a discrete event simulation model of Iranian railway system is used for analyzing performance of the system in freight sector. The model analysis shows more sensitivity of the system on loading and unloading facilities than on number of wagons and locomotives. System optimization through simulation optimization technique, shows that more than 4% of all wagons available in the n...

Performance-based budgeting adds effectiveness and economizing factors to traditional aspects of budgeting. This system distinguishes efficiency from effectiveness. Efficiency emphasizes on the useful utilization of the resources concerned while effectiveness considers the performance. Categorization of operations in performance-based budgeting is in a way that goals are expressed more transpar...

the poor orientation of the restaurants toward the information technology has yet many unsolved issues in regards to the customers. one of these problems which lead the appeal list of later, and have a negative impact on the prestige of the restaurant is the case when the later does not respond on time to the customers’ needs, and which causes their dissatisfaction. this issue is really sensiti...

‎In this paper‎, ‎an M/M/1 queue with instantaneous Bernoulli feedback is studied in the event of server failure‎, ‎the catastrophe occurs and after repair‎, ‎it starts to work again‎. ‎The transient response for the probability function of the system size is presented‎. ‎The steady state analysis of system size probabilities and some performance measures of system are provided‎. ‎Then the resu...