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1 
Utility of flight data in calibrating engagement simulationsMathiasmeier, Kenneth James 12 1900 (has links)
No description available.

2 
The model analyzer : prototyping the diagnosis of discreteevent simulation model specifications /Puthoff, Frederick Anthony, January 1991 (has links)
Thesis (M.S.)Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 204212). Also available via the Internet.

3 
A supervisor to monitor multiple simulatorsMcRae, Robert Norman January 1972 (has links)
The problem treated in this thesis is to create a system to monitor multiple interacting simulators. The problem is encountered in an attempt to simulate urban growth. The resulting system has a supervisor which controls all of the components of the system, namely the I/O routines, the graphics routine, the command routines, and the simulators. The main task of the supervisor is to display whichever data values the user desires. This involves executing some simulators, and extracting the data values from the data base. The extraction process first finds an association path between the files in the data base in order to relate the variables being displayed. Then using the association path the physical values are extracted from the data base. The data values are then passed to the graphics routine to be displayed for the user. / Science, Faculty of / Computer Science, Department of / Graduate

4 
SIMQ: a methodology for simulation by questionnaireGoulet, Maurice Eugene January 1978 (has links)
This paper presents SIMQ, a method of simulation program generation through questionnaires. Simulation is a powerful technique for analyzing complex systems; Hut its, acceptance has been impeded by the high cost of computer simulations. The objective of SIMQ is to enhance the usefulness of computer simulation by reducing the cost of developing simulation programs. Related research is reviewed in order to outline the development of the concept of program generation and to provide a standard of comparison for SIMQ.
The structure and use of SIMQ is explained and then illustrated through application to a demonstration problem. Initially, the discussion centers on a basic version of SIMQ. Subsequently an extension of SIMQ is presented which permits stochastic branching within the model. Finally, an interactive graphical front end for the SIMQ system is described.
Several experiments were conducted to test SIMQ's efficiency and characteristics. Results of field tests are also reported. Possible further extensions to SIMQ are outlined in the final chapter. The major conclusion reached is that the concept of program generation through questionnaires is feasible and that the structure of the SIMQ system is valid and useful. / Business, Sauder School of / Graduate

5 
A MONTE CARLO SIMULATION OF NEAR INFRARED RADIATION TRANSFER IN CLOUDSWu, Yi, 1960 January 1986 (has links)
No description available.

6 
Analysis of surface wind stress and ocean circulations simulated by general circulation modelsLee, Shengwei 01 July 1982 (has links)
Graduation date: 1983

7 
Rekenaarmodellering van pn strukture en fotovoltaiese selleBalde, Maryna 10 February 2014 (has links)
M.Sc. (Physics) / A computer program called RAUPV was developed to simulate onedimensional pn structures and photovoltaic cells. In order to simulate multilayer structures, the device is devided into a large number of discrete points with variable spacings. The physical parameters are calculated at each point, subjected to given external boundary conditions at the endpoints of the device. The physical processes are formulated from first principles, in such a way that they can be handled by numerical methods. A NewtonRaphson iteration technique is used to solve the large number of coupled, linear equations. The simulation is formulated in such a way that the equations must be solved for three variables at each point: the electron potential, the quasiFermi level for electrons and the quasiFermi level for holes. For the case of thermodinamic equilibrium, Poisson's equation is solved. A formulation is developed to handle the equation numericaly for variable intervals. Expressions for the free carrier concentrations are obtained using FermiDirac statistics. Expressions for the charge density in traps are also obtained and several types of boundary conditions are considered. The program is able to calculate the band structure, charge density, internal electric field and free carrier concentrations for any multilayer device. For the nonequilibrium case, Poisson's equation is solved simultaneously with the two continuity equations for electrons and holes. A special formulation for the current densities was developed, to assure convergence during the iteration process. Recombination is formulated in terms of capture crosssections of trap states within the gap. Several types of boundary conditions are considered. The program is able to calculate the current densities of electrons and holes within the device and yield as output the net current through the device for a given external applied voltage. A technique was developed for the NewtonRaphson iteration to work only with the diagonals of the matrix containing the partial derivatives. This technique saves much computing time and memory. Various techniques are built into the program to assure convergence and to decrease computing time. The solar spectrum is processed in order to calculate the optical exitations within the device. Multiple reflections are taken into account and an antireflection layer is also simulated. The program can thus calculate currentvoltage curves for a photovoltaic cell for any given spectrum. The program runs on a PC and is able to analise pn structures in detail. It can be used to design photovoltaic cells using fundamental physical principles as point of departure.

8 
A systems simulator programming language for the IBM 1620 computerWebb, Thomas Allen. January 1966 (has links)
LD2668 .T4 1966 W368 / Master of Science

9 
Complex seismic sources and timedependent moment tensor inversion.Kim, Junkyoung. January 1989 (has links)
There are many examples of earthquakes whose surface expressions are much more complicated than the seismologically derived faulting models. Seismologists also have found seismic source complexity and improved seismicity data have shown that rupture may occur on irregular or multiple shear surfaces. To simultaneously map both geometrical and temporal variation of the seismic sources for a complex rupture history from observed seismograms, it is possible to use a time dependent moment tensor (TDMT) inversion. The TDMT inversion algorithm has been tested with three synthetic data examples with varying degrees of complexity. The first example demonstrates that a multiple source with no focal depth change can be recovered, and the source parameters of each of the subevents can be accurately determined. In the second case we allowed the depth to vary for subevents (9km and 13km source depth, respectively). The two subevents can be identified on the basis of simultaneous shapechange of the moment tensor elements along with noncausality and the size of the CLVD component. The third example introduced source complexity by having two subevents which overlapped in time. The overlapped period could be seen in the moment tensor elements as unusually abrupt changes in the time function shape. The TDMT inversion was also performed on longperiod body waves for three earthquakes: the 1982 Yemen earthquake, the 1971 San Fernando earthquake, and the 1952 Kern County earthquake. The Yemen earthquake was mapped as two simple, normalslip subevents (with onset timing of the second subevent 5 seconds after the first) without a significant component of left or rightlateral displacement or source depth change. The San Fernando earthquake is interpreted as two shear dislocation sources with changing source depths, possibly indicating upward rupture propagation (from 13km to 7km). The interpretation of the TDMT inversion for the Kern County earthquake was also a double point source which propagates upward from 20km to 5km. The resultant moment tensor functions from inversion of the synthetic waveforms, a combination of isotropic and tectonic release, demonstrated that the tectonic release associated with underground nuclear explosion can be separated and identified if the source depth between the explosions and tectonic release are different.

10 
Crowd behavioural simulation via multiagent reinforcement learningLim, Sheng Yan January 2016 (has links)
A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of requirements for the degree of Master of Science. Johannesburg, 2015. / Crowd simulation can be thought of as a group of entities interacting with one another. Traditionally,
an animated entity would require precise scripts so that it can function in a virtual
environment autonomously. Previous studies on crowd simulation have been used in real world
applications but these methods are not learning agents and are therefore unable to adapt and
change their behaviours. The state of the art crowd simulation methods include flow based, particle
and strategy based models. A reinforcement learning agent could learn how to navigate,
behave and interact in an environment without explicit design. Then a group of reinforcement
learning agents should be able to act in a way that simulates a crowd. This thesis investigates
the believability of crowd behavioural simulation via three multiagent reinforcement learning
methods. The methods are Qlearning in multiagent markov decision processes model, joint
state action Qlearning and joint state value iteration algorithm. The three learning methods are
able to produce believable and realistic crowd behaviours.

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