How to build valid and credible simulation models

Law,

doi:10.1109/wsc.2008.4736054

Cited by 89 publications

(31 citation statements)

References 3 publications

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“…Study development: Several different proposals have been set forth for developing simulation models, but they share a series of steps and recommendations [7], [8], [9], [10], [11]. We can summarise them into three main tasks: to build, validate and experiment.…”

Section: Methodsmentioning

confidence: 99%

“…As stated before, several different proposals have been set forth for building simulation models, but they all have in common a series of steps and recommendations [7], [8], [9], [10], [11], Firstly, the purpose of the model needs to be established. This determines key questions to be addressed and the elements to be simulated.…”

Section: Uesim Buildingmentioning

confidence: 99%

“…Furthermore, even standard statistical tests cannot be used in validating the behaviour of a system dynamics model, because of problems of autocorrelations and multicollinearity [59], [9].Therefore, some of the most relevant literature in the field of System Dynamics model validation [31], [60], [61], [62], [63], focus on the importance of model assessment in the validation of its internal structure using tools of informal and qualitative natures, such as expert reviews, inspections, walkthroughs, etc. "For dynamic models, validity primarily means validity of the internal structure of the model, not its output behaviour, and validation of the internal structure cannot be made entirely objective, formal and quantitative" [59].…”

Section: Uesim Verification and Validationmentioning

confidence: 99%

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Using simulation to aid decision making in managing the usability evaluation process

Hurtado

Ruiz

Orta

et al. 2015

Information and Software Technology

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Abstract.Context: This paper is developed in the context of Usability Engineering. More specifically, it focuses on the use of modelling and simulation to help decision-making in the scope of usability evaluation. Objective:The main goal of this paper is to present UESim: a System Dynamics simulation model to help decisionmaking in the make-up of the usability evaluation team during the process of usability evaluation. Method:To develop this research we followed four main research phases: a) study identification, b) study development, c) running and observation and finally, d) reflexion. In relation with these phases the paper describes the literature revision, the model building and validation, the model simulation and its results and finally the reflexion on it.Results: We developed and validated a model to simulate the usability evaluation process. Through three different simulations we analysed the effects of different compositions of the evaluation team on the outcome of the evaluation. The simulation results show the utility of the model in the decision making of the usability evaluation process by changing the number and expertise of evaluators employed. Conclusion:One of the main advantages of using such a simulation model is that it allows developers to observe the evolution of the key indicators of the evaluation process over time. UESim represents a customisable tool to help decision-making in the management of the usability evaluation process, since it makes it possible to analyse how the key process indicators are affected by the main management options of the Usability Evaluation Process.

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Section: Methodsmentioning

confidence: 99%

Section: Uesim Buildingmentioning

confidence: 99%

Section: Uesim Verification and Validationmentioning

confidence: 99%

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Using simulation to aid decision making in managing the usability evaluation process

Hurtado

Ruiz

Orta

et al. 2015

Information and Software Technology

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“…2. A seven step approach for conducting a successful simulation study (Law, 2008). Now, we study the impact of reordering on the various TCP protocols namely TCP Reno, TCP New Reno, TCP SACK, and TCP Vegas.…”

Section: Methodsmentioning

confidence: 99%

Modeling and Simulation of Out-of-Order Impact in TCP Protocol

Kadry¹,

Al-Issa²

2015

JACN

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Abstract-The Internet provides a powerful, cost effective, reliable, and survivable communication over the world for different services like e-commerce, finance, education, military, and so on. The Internet has been rapidly increased; it has been growing at unprecedented rates. As the Internet become huge, its network performance becomes subjected to a lot of problems that decrease the communication performance like congestion, interference, reordering and so on.In this paper, we focus on measuring the impact of packets and ACKs reordering on the performance of TCP variants namely TCP Reno, TCP New Reno, TCP SACK, and TCP Vegas, we also analyze the performance of these protocols when their duplicate acknowledgement threshold (Dupthresh) values are increased in order to prevent false fast retransmissions and unnecessary Congestion Window Size (CWND) reductions. Index Terms-TCP, out-of-order, NS-2, TCP Reno, TCP newReno, TCP SACK, TCP Vegas. I. INTRODUCTIONThe Internet communication is managed by set of protocols grouped by several layers, these protocols and layers construct the communications framework model or suite, TCP/IP suite one of the most common of all network protocol suites. TCP/IP is a hierarchical protocol made up of interactive layers (Fig. 1). Application layer are placed at the top of TCP / IP stack [1], it include many protocols, such as (FTP, HTTP, SMTP and so on) for application communication. The transport layer follows the application layer. TCP/IP makes available two distinct transport layer protocols to the application layer: Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). In our thesis, we depend Transmission Control Protocol (TCP) which is the most commonly used protocol in the Internet, because it is used for so many application protocols such as HTTP, POP, SMTP, etc. to Manuscript received November 12, 2014; revised June 14, 2015. S. Kadry is with American University of the Middle East, Kuwait (e-mail: skadry@gmail.com).A. E. Al-Issa was with Arts Sciences and Technology University, Lebanon (e-mail: eng.aliedan@yahoo.com).transfer data reliably between the source and destination. TCP provides reliable connection between the sender and the receiver by using sequence number for each packet and ACKs that confirm the delivery of the packet to the destination, TCP uses several techniques and algorithms to regulate the transmission rate at which the sender must send such as congestion control and flow control and etc.The recent researches [2], [3] appear that the occurrence of packet reordering on the network is not pathological behavior. Bennett et al. [4] had intended that reordering is highly prevalent on many links. The results of their study [4] indicate that the probability of a session, running through the US MAE-East exchange, experiencing packet reordering was over 90%. Intuitively, Bennett et al. referenced that the reason for the large proportion of flows experiencing reordering was the presence of parallelism on the routes taken by the packets flowing throug...

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“…El uso de modelos de simulación puede reemplazar la realización de experimentos en sistemas reales y aquellos proyectos que aún se encuentran en fase de desarrollo [1], permitiendo experimentar, evaluar y comparar muchos sistemas alternativos [2].…”

Section: Introductionunclassified

Simulación de eventos discretos de la cadena logística de exportación de commodities

Hernandez

Librantz

2014

Ingeniare. Rev. chil. ing.

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RESUMENEl presente trabajo utiliza la técnica de simulación de eventos discretos como metodología de apoyo a la decisión en un problema complejo con múltiples variables; el objetivo es modelar las operaciones logísticas involucradas en la exportación marítima de commodities en las presentaciones de carga suelta y granel desde doce empresas productoras hasta el puerto marítimo. La simulación permite analizar la sensibilidad de los principales parámetros y variables del sistema, con el fin de definir diferentes modelos de planeación de despachos. Los escenarios muestran que es posible obtener una reducción de los inventarios y de los costos de mantenimiento, así como también mejorar los indicadores de servicio y como consecuencia aumentar la tasa de utilización de los recursos.Palabras clave: Simulación de eventos discretos, puertos marítimos, ProModel, exportación marítima. ABSTRACT This paper uses the technique of discrete event simulation as methodology for decision support in a complex problem with multiple variables; the objective is to model the logistics operations involved in

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How to build valid and credible simulation models

Cited by 89 publications

References 3 publications

Using simulation to aid decision making in managing the usability evaluation process

Using simulation to aid decision making in managing the usability evaluation process

Modeling and Simulation of Out-of-Order Impact in TCP Protocol

Simulación de eventos discretos de la cadena logística de exportación de commodities

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