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Implementação de um gerenciador de redes overlay para o GridSim; Implementation of an overlay network manager for GridSim

Sabatine, Ricardo José
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 11/11/2010 Português
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Computação em grade tem se estabelecido como um importante paradigma de computação, por permitir lidar com grandes quantidades de cálculos e dados e a colaboração de participantes geograficamente distribuídos. Esses sistemas devem ser organizados de forma completamente distribuídas, com cada participante mantendo informações sobre outros participantes, e as informações necessárias ao funcionamento do sistema circulando pela rede de overlay resultante. Quando novas propostas de algoritmos, protocolos ou infraestruturas para a grade são apresentadas, sua avaliação efetiva implica considerar sua operação com uma grande quantidade de participantes, o que invariavelmente significa que simulações devem ser realizadas. Este trabalho apresenta um sub-sistema de simulação de redes de overlay integrado à plataforma de simulação de computação de grade GridSim, de forma a facilitar o estudo desse tipo de estruturas e o desenvolvimento de novas propostas de protocolos e algoritmos para seu uso em grades de computadores. A metodologia adotada resultou no desenvolvimento de um Java package no GridSim com classes e interfaces que representam os conceitos básicos de redes de overlay e da interface dos clientes com essas redes. A partir dele foi possível desenvolver protocolos para redes estruturadas e não estruturadas no simulador e simulá-los utilizando cenários de grade de dados. Com os resultados obtidos foi possível observar que...

A barrier method for constrained nonlinear optimization using a modified Hopfield network

Silva, I. N. da; Ulson, Jose Alfredo Covolan; Souza, A. N. de
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 1744-1749
Português
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The ability of neural networks to realize some complex nonlinear function makes them attractive for system identification. This paper describes a novel barrier method using artificial neural networks to solve robust parameter estimation problems for nonlinear model with unknown-but-bounded errors and uncertainties. This problem can be represented by a typical constrained optimization problem. More specifically, a modified Hopfield network is developed and its internal parameters are computed using the valid-subspace technique. These parameters guarantee the network convergence to the equilibrium points. A solution for the robust estimation problem with unknown-but-bounded error corresponds to an equilibrium point of the network. Simulation results are presented as an illustration of the proposed approach.

A case for spiking neural network simulation based on configurable multiple-FPGA systems

Yang, Shufan; Wu, Qiang; Li, Renfa
Fonte: Springer Netherlands Publicador: Springer Netherlands
Tipo: Artigo de Revista Científica
Português
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Recent neuropsychological research has begun to reveal that neurons encode information in the timing of spikes. Spiking neural network simulations are a flexible and powerful method for investigating the behaviour of neuronal systems. Simulation of the spiking neural networks in software is unable to rapidly generate output spikes in large-scale of neural network. An alternative approach, hardware implementation of such system, provides the possibility to generate independent spikes precisely and simultaneously output spike waves in real time, under the premise that spiking neural network can take full advantage of hardware inherent parallelism. We introduce a configurable FPGA-oriented hardware platform for spiking neural network simulation in this work. We aim to use this platform to combine the speed of dedicated hardware with the programmability of software so that it might allow neuroscientists to put together sophisticated computation experiments of their own model. A feed-forward hierarchy network is developed as a case study to describe the operation of biological neural systems (such as orientation selectivity of visual cortex) and computational models of such systems. This model demonstrates how a feed-forward neural network constructs the circuitry required for orientation selectivity and provides platform for reaching a deeper understanding of the primate visual system. In the future...

Evaluating Australian Football League Player Contributions Using Interactive Network Simulation

Sargent, Jonathan; Bedford, Anthony
Fonte: Asist Group Publicador: Asist Group
Tipo: Artigo de Revista Científica
Publicado em 01/03/2013 Português
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This paper focuses on the contribution of Australian Football League (AFL) players to their team’s on-field network by simulating player interactions within a chosen team list and estimating the net effect on final score margin. A Visual Basic computer program was written, firstly, to isolate the effective interactions between players from a particular team in all 2011 season matches and, secondly, to generate a symmetric interaction matrix for each match. Negative binomial distributions were fitted to each player pairing in the Geelong Football Club for the 2011 season, enabling an interactive match simulation model given the 22 chosen players. Dynamic player ratings were calculated from the simulated network using eigenvector centrality, a method that recognises and rewards interactions with more prominent players in the team network. The centrality ratings were recorded after every network simulation and then applied in final score margin predictions so that each player’s match contribution-and, hence, an optimal team-could be estimated. The paper ultimately demonstrates that the presence of highly rated players, such as Geelong’s Jimmy Bartel, provides the most utility within a simulated team network. It is anticipated that these findings will facilitate optimal AFL team selection and player substitutions...

Spiking network simulation code for petascale computers

Kunkel, Susanne; Schmidt, Maximilian; Eppler, Jochen M.; Plesser, Hans E.; Masumoto, Gen; Igarashi, Jun; Ishii, Shin; Fukai, Tomoki; Morrison, Abigail; Diesmann, Markus; Helias, Moritz
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
Publicado em 10/10/2014 Português
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Brain-scale networks exhibit a breathtaking heterogeneity in the dynamical properties and parameters of their constituents. At cellular resolution, the entities of theory are neurons and synapses and over the past decade researchers have learned to manage the heterogeneity of neurons and synapses with efficient data structures. Already early parallel simulation codes stored synapses in a distributed fashion such that a synapse solely consumes memory on the compute node harboring the target neuron. As petaflop computers with some 100,000 nodes become increasingly available for neuroscience, new challenges arise for neuronal network simulation software: Each neuron contacts on the order of 10,000 other neurons and thus has targets only on a fraction of all compute nodes; furthermore, for any given source neuron, at most a single synapse is typically created on any compute node. From the viewpoint of an individual compute node, the heterogeneity in the synaptic target lists thus collapses along two dimensions: the dimension of the types of synapses and the dimension of the number of synapses of a given type. Here we present a data structure taking advantage of this double collapse using metaprogramming techniques. After introducing the relevant scaling scenario for brain-scale simulations...

Design and implementation of a sector-based airspace model for the MIT Extensible Air Network Simulation

Whittaker, Colin J
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 84 p.
Português
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The MIT Extensible Air Network Simulation (MEANS) is a tool that has been designed to assist airline schedulers and air traffic managers in predicting flight delays for given air traffic scenarios. One aspect of the simulation, the determination of flight times, has received criticism from the MEANS users as being too simplistic for their needs. Currently, MEANS predicts flight times based on a historical distribution of observed flight times between city pairs. This system ignores the effects of flight level winds and airspace congestion, two major determiners of flight time. The replacement flight time model presented divides the airspace into discrete sectors based on existing divisions in air traffic control. Each sector has its own wind conditions and capacity limitations which affect passing flights. Results show that, after some calibration, the new flight time model produces accurate flight times when the airspace is divided into ARTCC domains and does not introduce additional errors into other parts of the simulation. Additionally, test scenarios show that the new system is capable of modeling airspace capacity events, such as a radar failure. Comparative results reveal that the old, distribution model produces surprisingly accurate flight times for typical wind conditions and airspace utilization.; by Colin J. Whittaker.; Thesis (M. Eng.)--Massachusetts Institute of Technology...

Background Traffic Modeling for Large-Scale Network Simulation

Li, Ting
Fonte: FIU Digital Commons Publicador: FIU Digital Commons
Tipo: Artigo de Revista Científica Formato: application/pdf
Português
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Network simulation is an indispensable tool for studying Internet-scale networks due to the heterogeneous structure, immense size and changing properties. It is crucial for network simulators to generate representative traffic, which is necessary for effectively evaluating next-generation network protocols and applications. With network simulation, we can make a distinction between foreground traffic, which is generated by the target applications the researchers intend to study and therefore must be simulated with high fidelity, and background traffic, which represents the network traffic that is generated by other applications and does not require significant accuracy. The background traffic has a significant impact on the foreground traffic, since it competes with the foreground traffic for network resources and therefore can drastically affect the behavior of the applications that produce the foreground traffic. This dissertation aims to provide a solution to meaningfully generate background traffic in three aspects. First is realism. Realistic traffic characterization plays an important role in determining the correct outcome of the simulation studies. This work starts from enhancing an existing fluid background traffic model by removing its two unrealistic assumptions. The improved model can correctly reflect the network conditions in the reverse direction of the data traffic and can reproduce the traffic burstiness observed from measurements. Second is scalability. The trade-off between accuracy and scalability is a constant theme in background traffic modeling. This work presents a fast rate-based TCP (RTCP) traffic model...

Background traffic modeling for large-scale network simulation

Li, Ting
Fonte: FIU Digital Commons Publicador: FIU Digital Commons
Tipo: Artigo de Revista Científica
Português
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47.36525%
Network simulation is an indispensable tool for studying Internet-scale networks due to the heterogeneous structure, immense size and changing properties. It is crucial for network simulators to generate representative traffic, which is necessary for effectively evaluating next-generation network protocols and applications. With network simulation, we can make a distinction between foreground traffic, which is generated by the target applications the researchers intend to study and therefore must be simulated with high fidelity, and background traffic, which represents the network traffic that is generated by other applications and does not require significant accuracy. The background traffic has a significant impact on the foreground traffic, since it competes with the foreground traffic for network resources and therefore can drastically affect the behavior of the applications that produce the foreground traffic. This dissertation aims to provide a solution to meaningfully generate background traffic in three aspects. First is realism. Realistic traffic characterization plays an important role in determining the correct outcome of the simulation studies. This work starts from enhancing an existing fluid background traffic model by removing its two unrealistic assumptions. The improved model can correctly reflect the network conditions in the reverse direction of the data traffic and can reproduce the traffic burstiness observed from measurements. Second is scalability. The trade-off between accuracy and scalability is a constant theme in background traffic modeling. This work presents a fast rate-based TCP (RTCP) traffic model...

Inverse laplace transform for transient-state fluid line network simulation

Zecchin, A.; Lambert, M.; Simpson, A.
Fonte: ASCE-Amer Soc Civil Engineers Publicador: ASCE-Amer Soc Civil Engineers
Tipo: Artigo de Revista Científica
Publicado em //2012 Português
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Inverse Laplace transform methods have a long history in the development of time-domain fluid line models. This paper presents a study combining the new Laplace-domain input/output (I/O) model derived from the network admittance matrix with the Fourier series expansion numerical inverse Laplace transform (NILT) to serve as a time-domain simulation model. A series of theorems are presented demonstrating the stability of the I/O model, which is important for the construction of the NILT method. In the previous work by the first author, the Fourier series expansion algorithm was studied, where qualitative relationships between the parameters and numerical errors were analyzed, and reliable parameter heuristics were developed. These heuristics are used for a series of numerical examples dealing with networks of 11, 35, 51, and 94 pipes by using five different pipe models. The examples are used as the basis from which the accuracy and numerical efficiency of the proposed NILT are compared to the standard method of characteristics (MOCs) model for transient pipeline networks. Findings show that, for all case studies considered, the proposed NILT is numerically efficient for the pipe types involving convolution operations, and it is accurate for networks composed of both linear and nonlinear pipe types.; Aaron C. Zecchin...

A computer network simulation tutorial for COMNET III

Sullivan, Jeffrey Edward
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Tese de Doutorado
Português
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Approved for public release; distribution is unlimited; The military is heavily reliant on the transfer of information among various networks in its day-to-day operations. With fewer defense dollars available for the development of new systems, the use of commercial- off-the-shelf (COTS) hardware to build military information networks is becoming commonplace. The critical nature of much of this information requires that knowledge of the performance characteristics of the networks through which this information travels be known. These characteristics allow network managers and designers to plan for future growth of the network, analyze network reliability, and plan for the construction of new networks. One method to determine the performance characteristics of a network is through the use of modeling and simulation. COMNET III release 1., 1n is a COTS network simulation application which may be used to model and simulate both local and wide area networks. This thesis provides a tutorial to explain the theory used in the application for the modeling and simulation of networks. Each chapter presents the theory of several objects which may be used in the application, states a network problem which is to be analyzed, provides step- by-step instructions to build a model to analyze the network problem...

Power electronic building block network simulation testbed stability criteria and hardware validation studies

Badorf, Michael G
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Português
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Approved for public release; distribution is unlimited; Naval power distribution has principally used an AC network to supply loads. With the advent of new power electronic devices, the focus has shifted to employing a DC distribution system that eliminates large transformers and mechanical switching devices and enhances the survivability of the platform. The Power Electronic Building Block (PEBB) Network Simulation Testbed currently under construction at the Naval Postgraduate School is a study into the feasibility of such DC systems. The objective of this thesis was to perform theoretical and simulation-based analysis to establish quantitative criteria for PEBB Testbed stability. These criteria were then used to develop a set of hardware studies to investigate the interaction of components within the PEBB testbed. Finally, the hardware studies were utilized to verify PEBB Testbed performance. Principal conclusions of this research included that the PEBB testbed demonstrated stability under all simulated loading conditions. Follow-on testing of the PEBB Testbed confirmed that the simulations correlated well with hardware implementation. In addition, the hardware validation studies revealed that switching harmonics had a considerable effect on the system output

Indoor propagation simulation software

Calle, Juan Carlos
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Tese de Doutorado Formato: xiv, 47 p.;28 cm.
Português
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Approved for public release; distribution is unlimited; Computer simulation can be used to predict the signal strength in complex indoor environments. Signal propagation prediction is essential for determining the coverage of WLAN's (Wireless Local Area Networks). Increasing use of WLANs within infrastructures that have been built prior to the installation of the wireless networks requires measurements, semi-empirical models, or computer simulations to determine the number and location of access points for optimum coverage. In cases where the infrastructure has yet to be built (as in a new class of ships) the simulation may be the only option for WLAN coverage prediction. In such a case, blueprints may be used in conjunction with the indoor propagation simulation software in order to predict the best places to install the access points. The indoor propagation simulation software differs from the outdoor propagation software used for the cellular networks because of the differences in the characteristics of indoor and outdoor propagation channels. This thesis explains the characteristics and structure of a Wireless Local Area Network and presents the computer simulation results the 2.4 GHz wireless signal propagation inside an enclosed space. A building at the Naval Postgraduate School...

A simulation tool for the duties of computer specialist non-commissioned officers on a Turkish Air Force Base

Camur, Serhat.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Tese de Doutorado Formato: xx, 75 p. : col. ill. ;
Português
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Approved for public release, distribution unlimited; Staff assignment is one of the major problems in many lines of business. Knowing that the human being is one of the most expensive and demanding resources, efficient personnel employing becomes significant. Simulation techniques can help accomplish effective staff assignments. The aim of this thesis is to create a simulation tool by using a prototypical model of the computer system specialist non-commissioned officers' jobs on a Turkish Air Force Base, and to identify the effective factors on computer specialist shortage problem. This aim is accomplished by using event graph and discrete event simulation techniques for modeling purposes, and Simkit and Viskit for implementing the created model into simulation code. After evaluating the simulation results from an experiment involving fifteen input factors, it was concluded that the staff shortage problem can be addressed by using this study after updating the parameters used in the model to reflect the most recent distributions. On the other hand, increasing the number of personnel is not the only solution for addressing the problem. There are some other ways suggested by the study to improve the measure of effectiveness values...

A practical simulation method for social networks

Zeng, R.; Sheng, Q.; Yao, L.; Xu, T.; Xie, D.
Fonte: Australian Computer Society, Inc; Online Publicador: Australian Computer Society, Inc; Online
Tipo: Conference paper
Publicado em //2013 Português
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With the increasing popularity of social networks, it is becoming more and more crucial for the decision makers to analyze and understand the evolution of these networks in order to identify e.g., potential business opportunities. Unfortunately, understanding social networks, which are typically complex and dynamic, is not an easy task. In this paper, we propose an effective and practical approach for simulating social networks. We first develop a social network model that considers the addition and deletion of nodes and edges. We consider the nodes' in-degree, inter-nodes' close degree, which indicates how close the nodes are in the social network, and the limit of the network size in the social network model. We then develop a graph-based stratified random sampling algorithm for generating an initial network. To obtain the snapshots of a social network of the past, current and the future, we further develop a close degree algorithm and a close degree of estimation algorithm. The degree distribution of our model follows a power-law distribution with a "fat-tail". Experimental results using real-life social networks show the effectiveness of our proposed simulation method.; http://cs.adelaide.edu.au/~awc2013/index.html; Rui Zeng, Quan Z. Sheng...

Towards Simulation and Emulation of Large-Scale Computer Networks

Van Vorst, Nathanael M
Fonte: FIU Digital Commons Publicador: FIU Digital Commons
Tipo: Artigo de Revista Científica Formato: application/pdf
Português
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47.55174%
Developing analytical models that can accurately describe behaviors of Internet-scale networks is difficult. This is due, in part, to the heterogeneous structure, immense size and rapidly changing properties of today's networks. The lack of analytical models makes large-scale network simulation an indispensable tool for studying immense networks. However, large-scale network simulation has not been commonly used to study networks of Internet-scale. This can be attributed to three factors: 1) current large-scale network simulators are geared towards simulation research and not network research, 2) the memory required to execute an Internet-scale model is exorbitant, and 3) large-scale network models are difficult to validate. This dissertation tackles each of these problems. First, this work presents a method for automatically enabling real-time interaction, monitoring, and control of large-scale network models. Network researchers need tools that allow them to focus on creating realistic models and conducting experiments. However, this should not increase the complexity of developing a large-scale network simulator. This work presents a systematic approach to separating the concerns of running large-scale network models on parallel computers and the user facing concerns of configuring and interacting with large-scale network models. Second...

Co-simulation Environment for Modeling Networked Cyber-Physical Systems

Alharthi, Mohannad
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
Português
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47.31785%
Cyber-physical systems (CPSs) represent a new generation of engineered systems that tightly integrates computations, communications (cyber) and physics. Simulation plays a considerable role in validating CPSs as it substantially reduces the costs and risks in the design-testing cycles. Reliable simulations, however, mandate realistic modeling for both the cyber and the physical aspects. This is especially the case in various networked mobile CPSs (e.g., excavation robots and vehicular networks), where cost and risk may become substantial. Current CPS modeling tools lack complete models of communication. Co-simulation attempts to overcome this limitation by integrating multiple modeling and simulation tools to offer complete models of all aspects of CPSs. In this thesis, we design and implement a co-simulation environment for modeling and simulating networked CPSs. The environment is called AcumenNS3 and it integrates Acumen, a language for modeling hybrid physical systems, with NS-3, a discrete-event network simulator. This environment allows users to augment network simulations with physical models using an easy-to-use modeling language. It provides a seamless integration between network and physics models by providing mobility based on the physical simulation in addition to generic access to the physical state. Using the AcumenNS3 environment...

Demand response in future power systems management – a conceptual framework and simulation tool

Faria, Pedro
Fonte: Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto Publicador: Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto
Tipo: Dissertação de Mestrado
Publicado em //2011 Português
Relevância na Pesquisa
56.984194%
Mestrado em Engenharia Electrotécnica – Sistemas Eléctricos de Energia; In competitive electricity markets with deep efficiency concerns, demand response gains significant importance. Moreover, demand response can play a very relevant role in the context of power systems with an intensive use of distributed energy resources, from which renewable intermittent sources are a significant part. More active consumers’ participation can help improving the system reliability and decrease or defer the required investments. From the consumers’ point of view, it can result in reduced costs while guaranteeing adequate comfort levels. As demand response levels have decreased after the introduction of competition in the power industry, new approaches are required to take full advantage of demand response opportunities. DemSi, a demand response simulator, designed and implemented in the scope of this thesis, allows studying demand response actions and schemes in distribution networks. It undertakes the technical validation of the solution using realistic network simulation based on PSCAD. DemSi is able to support decision making concerning demand response programs design and use. DemSi considers the players involved in demand response actions...

Método de evaluación y selección de herramientas de simulación de redes; Evaluation and selection method of network simulation tools

García Dávalos, Alexander; Escobar Paz, Lina Marcela; Navarro Cadavid, Andrés; Vásquez Mejía, Andrés
Fonte: Universidad Icesi; Facultad de Ingeniería Publicador: Universidad Icesi; Facultad de Ingeniería
Tipo: article; Artículo Formato: PDF; p.55-71; Electrónico
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Existen diversas herramientas de software para simulación de redes (comerciales y libres). El hecho genera una pregunta interesante para los investigadores: ¿Cuál es mejor utilizar? Este artículo propone un nuevo método de evaluación/ selección basado en dos elementos claves: la norma ISO/IEC 9126-1, que define un modelo de calidad y evaluación de herramientas de software; y una función de costo, compuesta por los valores asignados a las seis características definidas en dicha norma, que permite obtener una valoración para cada una de las herramientas de software a evaluar, basándose en la encuesta a expertos. Se realizó un ejercicio de prueba del método propuesto, para evaluar las herramientas de simulación NS-2 y NCTUns, y sus resultados se contrastaron con la información consultada en publicaciones (artículos e informes técnicos) sobre evaluación/selección de herramientas de simulación de redes.; Currently exists many software tools designed for Network Simulation (both commercial and Open source), situation that present an important decision to make for many researchers: Which tool use for network simulation? This paper proposes a method for evaluation/selection of network simulation tools...

uIP Support for the Network Simulation Cradle

Kirsche, Michael; Kremmer, Roman
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 10/09/2015 Português
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This paper introduces the ongoing integration of Contiki's uIP stack into the OMNeT++ port of the Network Simulation Cradle (NSC). The NSC utilizes code from real world stack implementations and allows for an accurate simulation and comparison of different TCP/IP stacks. uIP(v6) provides resource-constrained devices with an RFC-compliant TCP/IP stack and promotes the use of IPv6 in the vastly growing field of Internet of Things scenarios. This work-in-progress report discusses our motivation to integrate uIP into the NSC, our chosen approach and possible use cases for the simulation of uIP in OMNeT++.; Comment: Published in: A. F\"orster, C. Minkenberg, G. R. Herrera, M. Kirsche (Eds.), Proc. of the 2nd OMNeT++ Community Summit, IBM Research - Zurich, Switzerland, September 3-4, 2015

High Frequency Radio Network Simulation Using OMNeT++

Weston, Jeffery; Koski, Eric
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 10/09/2015 Português
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47.064653%
Harris Corporation has an interest in making HF radios a suitable medium for wireless information networks using standard Internet protocols. Although HF radio links have many unique characteristics, HF wireless subnets can be subject to many of the same traffic flow characteristics and topologies as existing line-of-sight (LOS) radio networks, giving rise to similar issues (media access, connectivity, routing) which lend themselves to investigation through simulation. Accordingly, we have undertaken to develop efficient, high-fidelity simulations of various aspects of HF radio communications and networking using the OMNeT++ framework. Essential aspects of these simulations include HF channel models simulating relevant channel attributes such as Signal to Noise Ratio, multipath, and Doppler spread; a calibrated physical layer model reproducing the error statistics (including burst error distributions) of the MIL-STD-188-110B/C HF modem waveforms, both narrowband (3 kHz) and wideband (up to 24 kHz) on the simulated HF channels; a model of the NATO STANAG 5066 data link protocol; and integration of these models with the OMNeT++ network simulation framework and its INET library of Internet protocol models. This simulation is used to evaluate the impacts of different STANAG 5066 configuration settings on TCP network performance...