This paper analyses a single server with bulk service queue with general arrival pattern and multiple working vacation period. The model is analyzed by using Embedded Markov Chain technique. The steady state probability distribution at pre arrival epoch and arbitrary epoch are derived and measures like mean queue length are calculated. Finally, through some numerical examples, the parametric ef...

Abstract. In this paper, we discuss about the concept of single server feedback retrial queueing system with two types of service and each type consist of two essential phases under variant vacation policy. Customers are allowed to balk and renege at particular times. By using the supplementary variables method, steady state probability generating function for system size and orbit size are obt...

http://jvm.sagepub.com/content/17/1/17 The online version of this article can be found at: DOI: 10.1177/1356766710391132 2011 17: 17 Journal of Vacation Marketing Vellis Demosthenes Akoumianakis, Nikolas Vidakis, Anargyros Akrivos, Giannis Milolidakis, Dimitrios Kotsalis and George The Case Study of the eKoNES Building 'Flexible' vacation packages using collaborative assembly toolkits and dynam...

The M/C/1 queue with multiple vacations and gated service discipline is considered. We first provide an alternative approach to derive the Laplace-Stieltjes transform of the limiting waiting time distribution, which reveals the stochastic structure of the gated vacation system. Next we discuss the regenerative cycle of the gated vacation system. Based on these considerations, we carry our a tim...

• Planning and organising clinic-based and outreach activities. • Receiving and issuing supplies, including for operating theatre, the outpatient department, and refractive error services. • Making regular inventory reports and reordering when necessary to ensure that supplies are in stock. • Keeping track of accounting for the hospital or overall eye care programme and producing reports, inclu...

PURPOSE Technology-related behaviors (e.g., computer use) before bedtime (BT) have been associated with poorer and shorter sleep in adolescents; however, less is known about other behaviors in relation to sleep. This study characterized a range of behaviors in the hour before bed (i.e., pre-BT behaviors [PBBs]) and examined their relationship with sleep parameters during school and vacation per...