The objectives of the paper is to: (1) adopt hierarchical forecasting methods in modelling and international tourist arrivals Zimbabwe; (2) coming up with Zimbabwe Prediction Intervals (PIs) Quantile Regression Averaging (QRA) to tourism forecasts. Zimbabwe’s monthly data from January 2002 December 2018 was used. dataset used before COVID-19 period were disaggregated according purpose visit (PO...

The steady state distribution of quasi-birth-death pro esses an be eÆ iently obtained by matrix-geometri (MG) methods. Sin e a number of tele ommuni ation problems are modelled by pro esses with bat h arrivals, the extension of MG methods for these pro esses has pra ti al importan e. This paper presents an extension of MG methods whi h is e e tive for the analysis of quasi-birth-death pro esses...

In this contribution, a discrete-time single-server infinite-capacity queue with correlated arrivals and general service times is investigated. Arrivals of cells are modelled as an on/off source process with geometrically distributed on-periods and off-periods, which is called Bernoulli bursty source. Based on the probability generating function technique, closedform expression of some performa...

Previous studies [Tiemann et al., J. Acoust. Soc. Am. 120, 2355-2365 (2006)] have reported the localization of marine mammals in 3-D from their clicks using multipath arrivals. Bathymetric variations were advantageously used to predict multipath arrival times with a raytracer. These arrivals are directly discernible from the time series for impulsive sources, such as whale clicks, but extension...

A mathematical cell delay modeling and performance comparison of two iterative scheduling algorithms for ATM input-queued switch are carried out in this paper. The algorithms under consideration are iterative round robin with multiple classes (IRRM-MC) and iterative round robin with slip (iSLIP). By using Bernoulli arrivals a mathematical model is proposed for both algorithms. The developed mod...

Towed streamer operations in congested areas lead to gaps in 3D coverage making the OBC (Ocean Bottom Cable) method employing detectors on the ocean bottom a necessity. In order to ensure that high quality seismic data is obtained using this method one has to address the problem of water column reverberation at the acquisition stage itself. Every primary arrival at a detector location is follow...