scholarly journals Aplicação de teoria de filas em um laboratório de exames médicos em Parauapebas-PA / Application of queue theory in a medical exam laboratory in Parauapebas-PA

2021 ◽  
Vol 5 (3) ◽  
pp. 1445-1460
Author(s):  
Thaynara Lopes dos Santos Castro ◽  
Cristiane Sampaio Rocha ◽  
Ellen Laena de Sousa Sousa Cardoso ◽  
Lucas Rafael Castro De Sousa ◽  
Diego Moah Lobato Tavares
Keyword(s):  
Queue Theory

Em diversas situações do cotidiano é comum perceber esperas que geram filas, algumas são rápidas, mas outras ocorrem além do planejado, sobretudo, quando se trata de atendimento em redes públicas como é o caso do laboratório municipal, localizado na cidade de Parauapebas no estado do Pará. Este local foi escolhido como objeto de estudo principalmente por ser o único laboratório público da cidade e claramente perceptível as longas filas devido a demanda alta por atendimento e baixa capacidade do sistema em absorvê-la em curto tempo. A Lei 13.460 de Junho de 2017 dispõe dentre os direitos básicos dos usuários aos serviços públicos que os mesmos tenham previsão do tempo de espera para atendimento. Portando este trabalho foi desenvolvido aplicando os conceitos de teoria de filas com o propósito realizar uma análise do sistema de atendimento e propor uma solução para minimizar a espera dos pacientes ao realizar exames.

Applying queue theory for modeling of cloud computing: A systematic review

2019 ◽  
Vol 31 (17) ◽  
pp. e5186 ◽  
Author(s):  
Einollah Jafarnejad Ghomi ◽  
Amir Masoud Rahmani ◽  
Nooruldeen Nasih Qader
Keyword(s):  
Systematic Review ◽  
Cloud Computing ◽  
Queue Theory

Multi-Location Inventory Model Considering Bidirectional and Unidirectional Transshipments Simultaneously

2013 ◽  
Vol 694-697 ◽  
pp. 2742-2745
Author(s):  
Jin Hong Zhong ◽  
Yun Zhou
Keyword(s):  
Process Model ◽  
Approximate Calculation ◽  
Inventory Model ◽  
Inventory System ◽  
Death Process ◽  
Birth And Death Process ◽  
Inventory Models ◽  
Continuous Review ◽  
Poisson Demand ◽  
Queue Theory

Abstract. A cross-regional multi-site inventory system with independent Poisson demand and continuous review (S-1,S) policy, in which there is bidirectional transshipment between the locations at the same area, and unidirectional transshipment between the locations at the different area. According to the M/G/S/S queue theory, birth and death process model and approximate calculation policy, we established inventory models respectively for the loss sales case and backorder case, and designed corresponding procedures to solve them. Finally, we verify the effectiveness of proposed models and methods by means of a lot of contrast experiments.

scholarly journals Simulation of queue length on Amplas Entrance Toll before and after the ramp off development with Vissim software

2018 ◽  
Vol 181 ◽  
pp. 07002 ◽  
Author(s):  
Medis Surbakti ◽  
Tadeus Satria
Keyword(s):  
Service Time ◽  
Queue Length ◽  
Theory Method ◽  
City Administration ◽  
Software Models ◽  
Research Site ◽  
Before And After ◽  
Queue Theory ◽  
Toll Booth

In 2016 Medan City administration built on off ramp at Amplas fly over, where this ramp off directly to toll booth Amplas. The faster the time needs to get to the toll booth enables the rate of arrival vehicles that impact with increasing queue length. The purpose of this study is to know the length of the queue at Amplas toll booth before and after ramp off construction with queue theory method and vissim softwaremodelings. Data acquired by recording the activities at the research site in the form of vehicles volume. The queue length obtained from the queue method with average service time 7 seconds is 6,212 meter while the result using VISSIM software is 11,988 meter. From the VISSIM software models also obtained that the length of queue after the construction of the ramp off increases compared before the construction of ramp off, from 6,67 meter to 11,988 metre.

scholarly journals Dimensioning a Call Center: Simulation or Queue Theory?

2009 ◽  
Vol 2 (2) ◽  
pp. 34 ◽  
Author(s):  
Marco Aurélio Carino Bouzada
Keyword(s):  
Analytical Method ◽  
Analytical Methods ◽  
Call Center ◽  
Experimental Approach ◽  
Call Centers ◽  
Experimental Methods ◽  
New Approach ◽  
Alternative Methodology ◽  
Queue Theory ◽  
Set Up

The objective of this paper is to establish a dichotomy - opposing analytical methods (such as Queue Theory) to experimental methods (such as Simulation) and discussing their adequateness to complex operations - set up in the matter of dimensioning the handling capacity of a large brazilian call centers company. The literature related to the application of such methods at call centers is reviewed, and the way the question is treated nowadays by the company is described. Then an experimental approach is suggested to be implemented as an alternative methodology to deal with the issue, instead of the analytical method in use. The results obtained are used to justify the adequacy of the experimental approach to the modern call centers operation, as long as it is possible to have the model closer to reality. The main implication points to a better understanding of the operation achieved with the new approach

scholarly journals A Stochastic Simulation Model for the Optimization of the Taxi Management System

2019 ◽  
Vol 11 (14) ◽  
pp. 3838
Author(s):  
Aleksander Król ◽  
Małgorzata Król
Keyword(s):  
Simulation Model ◽  
Real Number ◽  
Service Level ◽  
Critical Number ◽  
System Behavior ◽  
Taxi Drivers ◽  
The Real ◽  
Incomplete Knowledge ◽  
Stochastic Simulation Model ◽  
Queue Theory

The paper presents a simplified simulation model of the operation of a taxi system. The model retains the main features of a real taxi transportation system and despite its simplicity examines the system behavior in different conditions. It was shown that for every request generation rate a critical number of taxis in disposal could be determined. If the real number of taxis is lower than the critical number, the queue of pending requests grows in an unlimited way. On the other hand, if the real number of taxis is significantly higher, the service level is clearly not better and leads to the waste of taxi drivers’ time and fuel. The presented model can be regarded as a queue system; therefore, the well-known queue theory is used to describe its nature. However, this approach has some practical limitations coming from incomplete knowledge on real transportation demands, which additionally undergo significant fluctuations. A method, which optimizes the assignment of vacant taxis to the pending requests was also introduced. It was proven that this method mitigated the influence of the above-mentioned limitations.

scholarly journals Travel Time Model of Left-Turning Vehicles at Signalized Intersection

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Leng Jun-qiang ◽  
Feng Yu-qin ◽  
Zhai Jing ◽  
Bao Lei ◽  
He Yi
Keyword(s):  
Travel Time ◽  
Flow Rate ◽  
Signalized Intersection ◽  
Time Model ◽  
Through Flow ◽  
Negative Exponential Distribution ◽  
The Common ◽  
Queue Theory ◽  
Negative Exponential ◽  
The Impact

The travel time of left-turning vehicles at signalized intersection was discussed. Under the assumption that the opposing through vehicles headway follows M3 distribution, the travel time model was established on the basis of gap theory and queue theory. Comparison was done with the common model based on the assumption that the opposing through vehicles headway follows negative exponential distribution. The results show that the model in this paper has stronger applicability and its most relative error is less than 15%. In addition, the sensitivity analysis was done. The results show that the opposing through flow rate has significant impact on travel time. The impact of left-turning flow rate and following headway is light when the opposing through flow rate is small, the threshold is about 0.18 veh/s. The model established in this paper can well calculate travel time of left-turning vehicles at intersection, and the methodology may provide reference to other occasions.

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