A transient analysis algorithm to control the quality and performance of the queuing system

Author(s):  
Mohamed Abd Allah El-Hadidy ◽  
M. Fakharany
Author(s):  
Emmanuel E. Anyanwu ◽  
Nnamdi V. Ogueke

The transient analysis and performance prediction of a solid adsorption solar refrigerator, using activated carbon/methanol adsorbent/adsorbate pair are presented. The mathematical model is based on the thermodynamics of the adsorption process, heat transfer in the collector plate/tube arrangement, and heat and mass transfers within the adsorbent/adsorbate pair. Its numerical model developed from finite element transformation of the resulting equations computes the collector plate and tube temperatures to within 5°C. The condensate yield and coefficient of performance, COP were predicted to within 5% and 9%, respectively. The resulting evaporator water temperature was also predicted to within 4%. Thus the model is considered a useful design tool for the refrigerator to avoid costly experimentation.


Author(s):  
NGURAH GDE PRABA MARTHA ◽  
KOMANG GDE SUKARSA ◽  
I PUTU EKA NILA KENCANA

The purpose of the analysis of queuing systems is to find out the model and the performance of queuing system was run. The research was conducted at PT. PLN (Persero) South Bali Area Rayon Kuta and the issue raised is about the analysis of queuing systems at the payment counter. Model queue is determined based on the Kendall notation and performance of queuing systems can be determined by calculating the utilization factor. At payment counter, the queuing model used is a model (M/G/4):(GD/?/?). The performance of queuing system at payment counter of PT. PLN (Persero) South Bali Area Rayon Kuta is less effective because each servers was busy on average only between 30% – 50% of working hours so that more time unemployed servers.


1995 ◽  
Vol 19 (6) ◽  
pp. 479-492 ◽  
Author(s):  
J. Prakash ◽  
G. Torzillo ◽  
B. Pushparaj ◽  
P. Carlozzi ◽  
R. Materassi

2015 ◽  
Vol 25 (4) ◽  
pp. 787-802 ◽  
Author(s):  
Alexander Zeifman ◽  
Anna Korotysheva ◽  
Yacov Satin ◽  
Victor Korolev ◽  
Sergey Shorgin ◽  
...  

Abstract Service life of many real-life systems cannot be considered infinite, and thus the systems will be eventually stopped or will break down. Some of them may be re-launched after possible maintenance under likely new initial conditions. In such systems, which are often modelled by birth and death processes, the assumption of stationarity may be too strong and performance characteristics obtained under this assumption may not make much sense. In such circumstances, time-dependent analysis is more meaningful. In this paper, transient analysis of one class of Markov processes defined on non-negative integers, specifically, inhomogeneous birth and death processes allowing special transitions from and to the origin, is carried out. Whenever the process is at the origin, transition can occur to any state, not necessarily a neighbouring one. Being in any other state, besides ordinary transitions to neighbouring states, a transition to the origin can occur. All possible transition intensities are assumed to be non-random functions of time and may depend (except for transition to the origin) on the process state. To the best of our knowledge, first ergodicity and perturbation bounds for this class of processes are obtained. Extensive numerical results are also provided.


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