modeling and simulation has become a driving force within the engineering and science communities as the cost of, and time for, experimentation continues to rise. Some areas of study, such as chemistry and biology, ma...
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ISBN:
(纸本)1563476746
modeling and simulation has become a driving force within the engineering and science communities as the cost of, and time for, experimentation continues to rise. Some areas of study, such as chemistry and biology, may not even have the ability to fully evaluate certain processes experimentally, making modeling and simulation even more important. The situation has led many areas of research to the necessity of modeling and simulating various processes using computers. In addition, the rise in computational capabilities (the supercomputers of a decade ago are outmoded by the PC clusters of today), has led to a paradigm shift from using the computer resources only available to a few researchers to a tool now available to many people. Researchers at the U.S. Air Force Academy are working to bring these modeling and simulation tools into the classroom and laboratories for students to learn the capabilities, and limitations, of modern computational tools. Descriptions of how modeling and simulation is performed at the Academy are included, as well as details about the computational resources being used. Most importantly, descriptions of the methods used to bring these tools to the classroom are described in detail.
Discrete Event simulation is a natural way to simulate models that are characterized by heterogeneity in their spatio-temporal behavior. This paper describes a valley fever spore-propagation model that describes the t...
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Discrete Event simulation is a natural way to simulate models that are characterized by heterogeneity in their spatio-temporal behavior. This paper describes a valley fever spore-propagation model that describes the time dependent spatial distribution of spores in southern Arizona. Two implementations of this model are examined and their execution times are compared. A discrete event model exploits the fact that only a few areas are favorable for the growth of the fungus at any given time. This allows it to schedule events only at the areas that are favorable. In contrast, the existing discrete time model cannot take advantage of the few areas that are favorable.
This paper presents a new approach that enhances the performance of large scale cellular space simulations expressed in modular DEVS. The basic idea is to group cells in cellular space into smaller partitions that are...
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This paper presents a new approach that enhances the performance of large scale cellular space simulations expressed in modular DEVS. The basic idea is to group cells in cellular space into smaller partitions that are treated as atomic DEVS models. The enhancement is achieved by reducing the large number of messages generated by inter- cell communication. This, in turn, saves large number of simulator iterations that were used to handle such communication. The new approach gives significant simulation speedup over the conventional techniques of representing cells in DEVS. A landslide slope criticality model is used to perform some computational experiments to demonstrate the simulation speedup of our approach.
In order to check if the system behavior satisfies the requirement set, this paper uses a class of DEVS, called finite & deterministic DEVS (FD-DEVS). Since the infinite state behavior of FD-DEVS networks can be a...
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In order to check if the system behavior satisfies the requirement set, this paper uses a class of DEVS, called finite & deterministic DEVS (FD-DEVS). Since the infinite state behavior of FD-DEVS networks can be abstracted as a finite reachable graph, this paper utilizes the reachable graph structure to check the emptiness of illegal behavior detected by checkers, called rejectors, as well as the non-emptiness of legal behavior generated by components under testing.
The success of DEVS methods for simulating large continuous models calls for more in-depth examination of the applicability of discrete events in modeling continuous phenomena. We present a concept of event set and an...
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Complexity associated with the design of experiments for simulation models can be reduced through visualization. DEVS-Suite, a new generation of the DEVS Tracking Envi-ronment which itself was extended from DEVSJAVA, ...
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Complexity associated with the design of experiments for simulation models can be reduced through visualization. DEVS-Suite, a new generation of the DEVS Tracking Envi-ronment which itself was extended from DEVSJAVA, sup-ports visual design of experiments and introduces simula-tion data visualization. Data generated by the selected models can be collected dynamically and displayed as time-based trajectories. These capabilities complement animation of DEVS model components and their interactions. A ser-vice-oriented software system is modeled to illustrate the novel modeling features for DEVS simulations. Another ex-ample is developed in Ptolemy II and SimEvents to show the reduced visual complexity afforded by DEVS-Suite.
Interference is one of the most critical issues in the cellular Device-to-Device (D2D) networks. The sharing of radio resources in cellular and D2D communications offers spectrum efficiency advantages for the cellular...
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We examine motion realism in terms of salient communicative features. We argue that motion is amenable to a parameterization based on Laban Movement Analysis that yields real-time control over motion qualities, and th...
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On-Chip traffic modeling is a new research topic that came along with Network on Chip (NoC) design. On-chip traffic varies in rate and nature depending on the running application and the System on Chip components. Dif...
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ISBN:
(纸本)9781617382048
On-Chip traffic modeling is a new research topic that came along with Network on Chip (NoC) design. On-chip traffic varies in rate and nature depending on the running application and the System on Chip components. Different traffic models have been proposed as an attempt to capture the various transactions that occur inside the NoC, which connects different Intellectual Properties (IPs) on the same chip. In this research paper, recent traffic modeling paradigms will be reviewed and discussed. These models have been developed into traffic generator entities to emulate the traffic patterns on chip. However, none of these models (and hence traffic generators) completely capture the behavior of different applications and the interactions between different IPs components on chip, which can alter the traffic state and rate. In this paper, we will propose a comprehensive and flexible model that is based on Discrete EVent System Specification formalisms (DEVS) for modeling and simulation. Our model could be implemented as a traffic generator that has three internal functions, and input and output ports for the interactions with other IPs components such as caches, DSP units, etc.
Hybrid agent-landscape models are used as an environment in which to study humans, the environment, and their dynamics. To provide flexibility in model design, expressiveness, and modification, the environment models ...
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ISBN:
(纸本)1565553136
Hybrid agent-landscape models are used as an environment in which to study humans, the environment, and their dynamics. To provide flexibility in model design, expressiveness, and modification, the environment models and human agent models should be developed independently. While retaining each model's individuality, the models can be composed to create a model of a complex, hybrid agent-landscape system. This should allow for a much more in-depth analysis of each model independently, as well as a study of their interactions. To create such a modeling environment requires a look beyond a simple interface between two models. It may require that the models' formalisms be composed, their execution be synchronized, their architectures be integrated, and a common visualization be created to provide a whole-system data view during simulation. This paper discusses the complexities of such an undertaking.
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