The Department of Defense has always had an interest in simulation systems for training and analysis. Recently, simulation usage in training has been stressed. Simulation systems provide an easy and effective way for trainees to learn military doctrine and small unit tactics. In order to be effective, a simulation must accurately represent the real world. Sensory perception is one important real world influence that should be modeled. Modular Semi-Automated Forces (ModSAF) is a highly advanced computer simulation system that can model the movement, formations, equipment and other aspects of armed forces with precise calculations. In spite of all of the advances in ModSAF and other systems like it, the behaviors of sound and how they affect the warfighter have been scarcely modeled. The goal of this project is to investigate how sound is produced, propagated, and detected (acoustics), the behavioral effects sound has on the human psyche, and model the findings. It includes the development of a computer model of the physical phenomenon relating to sound, to be incorporated within ModSAF or another similar constructive simulation system.

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A Department of Defense (DoD) M&S education task force is in the process of studying the Modeling and Simulation (M&S) education of the acquisition workforce. Historically, DoD acquisition workforce education is not referred to as education, but rather what the Defense Acquisition University (DAU) refers to as "practitioner training, career management, and services." The DAU is the organization primarily responsible for training the DoD acquisition corps in conjunction with service schools and strategic partners in the civilian sector. DAU programs primarily focus on program management, contracting, and management of logistics across the system life cycle. Further, the examples and cases used in the training are primarily DoD centric. Only select DoD employees are exposed to Harvard Business School (HBS) perspectives. The use of M&S to improve system acquisition is only delivered in three courses. Further, Simulation-Based Acquisition (SBA) as a strategy in development of various systems is not explicitly taught. The general notion for this research is that exposure of actual or potential defense acquisition students to the rich civilian literature on M&S across the enterprise life cycle and SBA in particular may be beneficial to DoD. To further this general notion, this research investigates content in courses whose curriculum, while still more than 50% DoD, contains HBS SBA and other M&S related case studies. While abbreviated for the purpose of this abstract, the overall hypothesis of this dissertation is that M&S and HBS case studies make a positive contribution to DoD or potential DoD employees. To investigate this hypothesis, this research conducted both internal and external evaluations to determine the level to which the course makes a positive contribution to the student ability to "Understand the concepts of SBA across the entire program life cycle, in order to reduce the time, resources, and risks associated with the acquisition pr This was identified by the task force as a key element in the Education Skills Requirement (ESR) that this curriculum intends to address. The internal evaluation used inferential statistics to consider the validity of the course topics, content, evaluation methods, and case study delivery method through student evaluations of a live class. Among other variables, this research tracks class participants' responses (self-assessment) and performance (subject matter expert objective assessment) demographically to include current and potential DoD employees. With the graying of DoD workforce, potential DoD employees are important to the DoD community too. The external evaluation likewise considers the validity of the course topics and content through a survey of acquisition professionals external to the class. External acquisition professionals are drawn from across DoD as well as include former DoD acquisition employees. The combination of the internal and external evaluations provides insight into these and other issues related to the course topics, content, evaluation methods, and case study delivery methods and make recommendations on these and other issues for future course offerings.

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The challenge of sensing relative motion between vehicles is an important subject in the engineering field in recent years. The associated applications range from spacecraft rendezvous and docking to autonomous ground vehicle operations. The focus of this thesis is to develop the simulation tools to examine this problem in the laboratory environment. More specifically, the goal is to create a virtual unmanned ground vehicle that operates in the same manner as an actual vehicle. This simulated vehicle allows for safely testing other software or hardware components before application to the actual vehicle. In addition, the simulated vehicle, in contrast to the real vehicle, is able to operate on different surfaces or even different planets, with different gravitational accelerations. To accomplish this goal, the equations of motion of a two-wheel driven unmanned vehicle are developed analytically. To study the spacecraft application, the equations of motion for a spacecraft cluster are also developed. These two simulations are implemented in a modular form using the UMBRA framework. In addition, an interface between these two simulations is created for the unmanned vehicle to mimic the translational motion of a spacecraft's relative orbit. Finally, some of the limitations and future improvements of the existing simulations are presented. / Master of Science

LD2668 .T4 1966 W368 / Master of Science

Un excellent candidat pour la réalisation d'un ordinateur quantique est le qubit supraconducteur. Il s'agit d'un système dont le spectre est discret et dont les niveaux d'énergie sont séparés de manière anharmonique. On peut donc dire qu'il s'agit d'une réalisation en circuit d'un atome artificiel. Afin de contrôler cet atome artificiel, on s'inspire de l'électrodynamique quantique en cavité, où un atome interagit avec le champ électromagnétique confiné dans une cavité. À l'aide de circuit, il est possible d'atteindre des forces de couplage lumière-matière impossible à atteindre en cavité. Le système proposé par Blais remplace les atomes par des qubits supraconducteurs et la cavité par un résonateur coplanaire supraconducteur. Malheureusement, obtenir des solutions numériques pour ce problème devient rapidement très demandant et ce, surtout en présence d'une excitation extérieure de grande amplitude. Dans ce cas, plusieurs approximations ne tiennent plus lorsqu'on s'intéresse à la physique de ce système. Par exemple, à forte puissance, les qubits supraconducteurs ne peuvent plus être traités comme de simples systèmes à deux niveaux. On doit effectivement tenir compte des niveaux supérieurs du qubit. Un exemple de cette difficulté est la mesure à avalanche, qui permet de déterminer l'état initial d'un qubit en regardant le nombre de photons dans le résonateur dans son état stationnaire. Dans un certain régime de paramètres, il est possible d'atteindre un nombre de l'ordre de 10[indice supérieur 5] photons lors de cette mesure. Ceci correspond à un espace de Hilbert très grand, de sorte que trouver numériquement l'état stationnaire est un défi, mais simuler la dynamique de ce système est un défi encore plus grand. Il faut donc se tourner vers des approximations ou des techniques numériques différentes pour parvenir à saisir la dynamique de ces systèmes. C'était donc la motivation première de ce projet. Pour y parvenir, il a fallu utiliser diverses méthodes numériques, ainsi que quelques approximations. Avec ces méthodes, on a étudié la dynamique de deux types de mesure qui se produisent à très grand nombre de photons et donc nécessitant un très grand espace de Hilbert.

International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada / To model the "black boxes" in a command and telemetry simulation, it is important to preserve the abstraction of a one-to-one match between the real-world interfaces and the simulated interfaces. Everywhere a physical interface exists on the box, there needs to be a simulated interface. Preserving this abstraction allows the model to evolve more naturally with real-world design changes. In most command and telemetry systems, many different types of commands and telemetry can be sent over a single interface. This creates a problem in preserving the interface abstraction if the Ada language is used for implementation. Due to the fact that Ada is a "strongly typed" language, a different or overloaded operation needs to exist for each type of command or telemetry. However, by using a "discriminated variant record" to represent the commands and telemetry streams, a single operation can be used in the Ada specification. This not only preserves the abstraction but makes the software more maintainable by allowing the data list to change during the design of the "black box" without changing the Ada specification. As a result, "loose coupling" is achieved, a common set of commands and telemetry formats can be "inherited" to promote reuse, and overall system development and maintenance costs are reduced.

We apply various variance reduction techniques to the estimation of Asian averages and options and propose an easy-to-use quasi-Monte Carlo method that can provide significant variance reductions with minimal increases in computational time. We have also extended these techniques to estimate higher moments of the Asians. We then use these estimated moments to efficiently implement Gram--Charlier based estimators for probability density functions of Asian averages and options. Finally, we investigate a ranking and selection application that uses post hoc analysis to determine how the circumstances of procedure termination affect the probability of correct selection.

Multi-core design for CPU is the recent trend and we believe the trend will continue in near future. Researchers and industry architects utilize simulation to evaluate their designs and gain a certain level of confidence before manufacturing the actual products. Due to the fact that modern multi-core systems are complex, traditional sequential simulation can hit the bottlenecks in terms of execution time. To handle the complexity, Parallel Discrete Event Simulation (PDES) programs are employed. PDES program with well-designed partitioning schemes, synchronization algorithm and other optimizations can take advantage of the parallel hardware and achieve scalability for the simulation of multi-core systems. The objective of this dissertation is to design, develop, test and evaluate a variety of technologies to improve the performance and efficiency of parallel simulation of multi-core systems. The technologies include a general guide for partitioning schemes, an efficient front-end for timing-directed simulation, and a new conservative synchronization algorithm.