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A Naval Postgraduate School em Monterey, na Califórnia, é uma escola de Pós-Graduação que pertence à Marinha dos Estados Unidos.

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Update NPS / August 2014

Fonte: Monterey, California: Naval Postgraduate School. Publicador: Monterey, California: Naval Postgraduate School.
Tipo: Periódico
Português
Some articles include: Long-time professor champions design thinking, NPS foundation's legacy of support, information dominance leader recognized for service

Quantifying Human Performanceon a Moving Platform Using the Fitts' Law Task

Shattuck, Nita Lewis
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Conferência ou Objeto de Conferência
Português
Presentation including topics such as: purpose of Fitt's Law Task, NPS experience with sleep and motion studies, isoperformance examples, approach to calculating norms for the task, and Fitts' law task demonstration

Upcoming Conferences at the Naval Postgraduate School, 1997

Naval Postgraduate School (U.S.)
Fonte: Escola de Pós-Graduação Naval Publicador: Escola de Pós-Graduação Naval
Tipo: Newsletter
Português
24-27 Jun 96 Annual Tri-Service Radar Symposium (SECRET) - King, sponsored by NRL 25-26 Jun 96 Embedded Computer Systems Without Major Developments (UNCLASS) - Engineers' Auditorium, sponsored by AIAA 25-28 Jun 96 Joint Directors of Laboratories Basic Research Group Technical Panel on C3 (UNCLASS) - IN-122 and 4 classrooms, sponsored by National Defense University

Ambient noise and signal uncertainties during the summer shelfbreak primer exercise

Abbot, Philip; Gedney, Charles; Dyer, Ira; Chu, Ching-Sang
Fonte: Escola de Pós-Graduação Naval Publicador: Escola de Pós-Graduação Naval
Tipo: Artigo de Revista Científica
Português
Uncertainties in noise Ievel, andin signallevel after long-range (42 km) acoustic shallow water transmissions, from a pulsed source, are determined from the summer shelfbreak PRIMER experiment. Fluctuations over the 1 0-day period are not stationary, but are rendered so by tracking the wandering of their means. Then narrow-sense stationary probability density functions are obtained of ambient noise and signal peak transmissions from a match-filter output with time-bandwidth product = 1. The data are centered at 400 Hz, in a 100 Hz bandwidth, and analyzed from three individual hydrophones of a vertical line array. The ambient noise fluctuations closely follow the phase-random Log-Rayleigh density, with standard deviation cr = 5.6 dB. Signal peak statistics are determined from demeaned 50 s samples. The signal statistics over an 8-h period are approximately similar, but not identical, to those over the entire 10-day period. The signal has narrower histograms (cr "' 0.8 dB) than the noise. Log Chi-Square densities, fit to the signal histograms, suggest that about 30 equal intensity components contribute to the fluctuations, many more than can be attributed to the idealized modal structure in the shelfbreak duct. This suggests that either strong scattering affects the signal transmission...

Ji Hyun Yang's Research, Selected Research Projects

Hyun, Ji
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Artigo de Revista Científica
Português
Selected Research Projects by Ji Hyun Yang.; Several research projects include: Natioanal Research Council project (Dec. 2009- current) Visual scan pattern analysis and misperception modeling in overland navigation, Ph.D. project (Sep. 2004-Aug. 2007) Drowsy driver detection and countermeasures, modeling peripheral vision on target detection and acquisition (Sept. 2010 - current), Assessing human-systems performance in a field environment (Oct. 2008 - Sep. 2009), and Complex alerting systems development and system-wide impact (Sept. 2001-Aug. 2004)

The centroid and inertia tensor for a spherical triangle

Brock, John E.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
This monograph establishes formulas for the centroidal vector and the inertia tensor of a mass distribution which is uniform on the surface of a general spherical triangle. These results supplement formula-lists for useful, fundamental mass distributions such as that given in E. A. Milne's VECTORIAL MECHANICS. (Author); Professor John E. Brock (Code 59Bc) Department of Mechanical Engineering; http://archive.org/details/centroidinertiat00broc; NA; NA

Chaos Metrics for Testing Lagrangian Particle Models

Kamada, Ray
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
Approved for public release; distribution is unlimited.; The Lorenz and Henon attractors and two atmospheric Lagrangian particle models were tested using self-affine fractal dimension, DA, Shannon information entropy, S, and the Lyapunov exponent, lambda, along with turbulent kinetic energy, vertical variance, and Brunt-Vaisala Frequency. Results show that (1) chaos metrics are a new set of tools to assess the micro behavior of Lagrangian particle models, (2) that periodicity in bifurcatory systems differs from wave behavior in fluids, since wave states are not limited to amplitude extrema. (3) Non-spectral particle models lead to unrealistic variations in 'the chaos metrics with changes in buoyant stability. (4) S and DA behave oppositely at times, implying that diffusion and dispersion are not equivalent, even in the absence of mean windflow.; United States Air Force Space & Missile Center; http://archive.org/details/chaosmetricsfort00kama; MPIR FY76 169200541

The coefficient space appraoch to the stability of multidimensional digital filters

Davis, Daniel L.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
This report is concerned with the development of a new approach to the problem of stability for multidimensional, causal, recursive, 'all pole', digital filters. The distinguishing feature of this approach is that general stability criteria can be derived directly in terms of the coefficients of the transfer function of the filter. Thus by use of this method it is sometimes possible to determine which coefficients of the transfer function are critical to the stability of the filter, information which is, of course, important in filter design. Also the emphasis of this approach is on the development of a conceptual method for considering the problem in complete generality.; http://archive.org/details/coefficientspace00davi; N0001476WR60052; NA

A computer simulation case for the auditing classroom

Burns, David Carlo
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
During fiscal year 1972, the writer developed an auditing case which is currently used in the course MN 4151 (Internal Control and Auditing) at the Naval Postgraduate School. This case involves complex auditing and internal control problems related to manufacturing inventories and it is based upon a computer simulation model. The case has been well received by NPS students and appears to be a very effective teaching tool. A teaching approach for using this simulation case is described in an article entitled "A Computer Simulation Approach for Teaching the Evaluation of Internal Control." This article is scheduled for publication by the American Accounting Association early in 1974 in the Association's forthcoming book, tentatively entitled "Accounting Education." This report contains copies of all of the material which is necessary to implement the teaching approach described in the article mentioned above. The purpose of this report is to make the simulation case available to auditing instructors at universities other than the Naval Postgraduate School. (Author); http://archive.org/details/computersimulati00burn; NA

Computer Visualization of Battlefield Tenets

Kemple, William G.; Larson, Harold J.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
Approved for public release; distribution is unlimited.; The Battle Enhanced Analysis Methodologies (BEAM) project was designed to investigate the use of computer graphics in describing the performance of battalion-sized units in simulated combat. These descriptions were to be data-based and objective, providing useful critiques of actual performance according to standard Army doctrine. They would be natural candidates for use at the Army's Combat Training Centers. The first year's effort demonstrated objective graphic displays that portray the destructive potential of direct fire weapons in the defense (described in 1,2,4,5). These displays allow straightforward objective comparisons of different defensive alignments, and, from simulated battle runs, of defensive fire control strategies. These references also describe simple uncluttered displays that portray the movements and interactions of company (or higher) sized units throughout a battle. This report describes further results of the BEAM project. The initial displays were specifically derived for direct fire weapons in the defense; a major development is the extension to displays for indirect fire weapons in the defensive. This allows separate and joint examination of the direct and indirect fire destruction potential...

The consistent second-order theory of wave/structure interaction

Garrison, Clarence Jimmy
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
The consistent second-order theory of the interaction of regular gravity waves with a fixed object in water of finite depth is developed. The theory is carried out for the most general case of a body of arbitrary shape which may extend through the free-surface or be completely immersed. The incident wave evolves in the development as a second-order Stokes' wave. Boundary-value problems are established for both the first- and second-order velocity potentials and a numerical method based on the Green's function is outlined. The determination of forces exerted by gravity waves on large structures immersed in the sea has become of great practical interest in recent years. for example, in the design of bottom-mounted oil storage facilities or large ocean caissons, the wave-induced horizontal and up-lift forces and overturning moments are factors of primary importance. The effect of large amplitude waves in particular is of importance in the determination of the permanence of an ocean structure and, therefore, a higher-order theory appears to have significant practical value. For example, Apelt and Macknight (1976) found measured forces on a ocean caisson model in fairly large-amplitude shallow-water waves to be considerably in excess of calculations based on linear diffraction theory; National Science Foundation; http://archive.org/details/consistentsecond00garr; NSF Grant No. ENG 73-04019 A01; NA

Cost analysis for dual source weapon procurement

Greer, Willis R.; Liao, Shu S.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
It is widely held that competition can produce savings in the acquisition cost of weapon systems. However, a recent study of seven programs shows only three generated sufficient savings to offset the investments required to obtain them. Our study finds that the savings depends on how 'hungry' producers are. When a loss has resulted, capacity utilization has been above 80%; Chief of Naval Research, Arlington, VA 22217; http://archive.org/details/costanalysisford00gree; sponsored by the Office of Naval Research under work order N0001483WR30236.; NA

Cramer-Von Mises Variance Estimators for Simulations

Seila, Andrew F.; Goldsman, David; Kang, Keebom
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
Approved for public release; distribution is unlimited.; We study estimators for the variance parameter sigma(2) of a stationary process. The estimators are based on weightings yield estimators that are 'first-order unbiased' for sigma (2) We derive an expression for the asymptotic variance of the new estimators; this expression is then used to obtain the first-order unbiased estimator having the smallest variance among fixed-degree polynomial weighting functions. Although our work is based on asymptotic theory, we present exact and empirical examples to demonstrate the new estimators' small-sample robustness.; Naval Postgraduate School, Monterey, California.; http://archive.org/details/cramervonmisesva00gold; O&MN direct funding

Cumulative search-evasion games (CSEGs)

Eagle, James N.; Washburn, Alan R.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
Approved for public release; distribution is unlimited.; Cumulative search-evasion games (CSEGs) are two-person zero-sum search-evasion games where play proceeds throughout some specified period without interim feedback to either of the two players. Each player moves according to a preselected plan. If (Xt,Yt) are the positions of the two players at time t, then the game's payoff is the sum over t from 1 to T of A(Xt,Yt,t). Additionally, all paths must be connected. That is, the finite set of positions available for a player in any time period depends on the position selected by that player in the previous time period. One player attempts to select a mixed strategy over the feasible T-time period paths to maximize the expected payoff. The other minimizes. Two solution procedures are given. One uses the Brown- Robinson method of fictitious play and the other linear programming. An example problem is solved using both procedures. Keywords: Search strategies; Prohibiting; Mathematical models. (kt); Prepared for: Naval Postgraduate School, Monterey, CA.; http://archive.org/details/cumulativesearch00eagl; prepared in conjunction with research conducted under the Naval Postgraduate School Research Council Program

Defense Data Network (DDN) Performance Analysis Using Probability Modeling

Gaver, Donald Paul; Jacobs, Patricia A.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
The Data Defense Network (DDN) is a large packet switching network that services elements of the U.S. Department of Defense (DOD). The emphasis of this report is to perform probabilistic analysis of certain features of the DDN system with a view of enhancing or 'optimizing' measures of service such as data base throughput and the waiting times experienced by data-base-transfer customers. The particular questions addressed, and the models constructed, are in response to tasking statements supplied by personnel from the Defense Communications Engineering Center, Reston, Virginia. In Section 2 models are presented to study the optimal length of a packet subject to transmission errors. When a data transfer is to occur the total collection of bits that comprise the data base is divided into packets, i.e., subcollections of contiguous bits from the data base plus a header carrying address information. In Section 3 models are introduced to study the effect on D's buffer of all sources retransmitting at a retransmission interval of length 8. We also model the behavior of one form of congestion control, exponential backoff, a procedure that increases successive time-out intervals possibly from 8 to 28, 28 to 48, etc. In summary, probabilistic models have been constructed to study the effect of packet size and message size on system throughput and response time of a data-transfer operation. The effect of packet retransmission on response times has also been evaluated. (KR); Defense Communications Agency...

Design and Analysis of the Housing of the Communication Payload of the Petite Amateur Navy Satellite (PANSAT)

Gericke, Olaf
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
The Naval Postgraduate School's (NPS) Space Systems Academic Group is developing the Petite Amateur Navy Satellite (PANSAT), a small satellite for digital store-and-forward communication in the amateur frequency band. This thesis describes the design and the analysis of the communication payload housing of PANSAT. The payload consists of four circuit boards. The main challenge is to provide enough stiffness and minimize electromagnetic interference within the small amount of space determined by other parts surrounding the housing. The design of this particular housing is especially demanding and requires paying a lot of attention to details. Many factors, including launch loads, board weight, component size, orientation, and mounting must be considered.A particular aspect of this housing is the fact that there are an unusual number of electrical connectors involved in this design. Complicating this issue is the extreme physical constraint imposed by the configuration of the satellite. The structure as well as the boards are analyzed using classical hand calculation methods and more sophisticated methods, using SDRC® I-DEAS design software. In addition, a finite element analyses is performed using the I-DEAS finite element application which allows to model all structures in great detail mathematically. It also permits to examine the behavior of these structures under all possible load conditions...

Determining Optimal Instructor Levels at the Defense Language Institute

Dell, Robert F.; Kunzman, David S.; Bulfin, Robert L.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
Approved for public release; distribution is unlimited.; The Defense Language Institute (DLI) teaches various levels of foreign language competency to Department of Defense personnel. It currently offers instruction in 23 languages using 104 courses that range in length from 2 to 63 weeks. Student input and a mandated instructor-to-student ratio determine the number of sections of each course that must be taught each year. This paper develops integer linear programs to decide when to start each section of each course. The primary objective is to minimize the number of fun-time instructors required to meet the next three years' student input. Secondary objectives are used to improve the face validity of the models' recommendations. When compared with current manual methods, decisions developed using the models are superior for all measures of effectiveness considered, and they provide DLI with a savings opportunity in excess of $7 million over the next three years.; Naval Postgraduate School, Monterey, California.; http://archive.org/details/determiningoptim00dell; RNX2DP

A diffusion approximation model for a communication system allowing message interference

Gaver, Donald Paul; Lehoczky, John P.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
Mathematical probability models are presented to describe the service furnished to messages approaching c communications channels, on which messages in progress may be 'destroyed' by an attempted access by a new message. Re-tries by destroyed messages are modeled. Numerical results, using the models, are compared to simulations, validating model usefulness. (Author); supported by the Office of Naval Research and the Defense Communication Agency at the Naval Postgraduate School; http://archive.org/details/diffusionapproxi00gave; NA

Dimensional analysis and the theory of natural units

Gawain, Theodore Henry
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
Author(s) key words: Dimensional analysis, dimensional parameters, dimensions, fundamental dimensions, dimensionless numbers, dimensionless coefficients, dimensionless parameters, dimensionless pi's, Pi Theorem, English units, metric units MKS units, consistent units, inertial units, gravitational units, fixed units, standard units, natural units, intrinsic units, generalized units, unit and measure, dynamic similarity, thermodynamic similarity, theory of models Reynolds number Mach number Froude number drag coefficient, skin friction coefficient, momentum theory, propeller parameters, turbine parameters, rotorcraft parameters, pump parameters, compressor parameters, incompressible flow parameters, viscous flow parameters, physical equations, mathematical invariance; http://archive.org/details/dimensionalanaly00gawa; NA

Dimensional analysis and the concept of natural units in engineering

Gawain, Theodore Henry
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Relatório
Português
Author(s) key words: Dimensional analysis, dimensions, fundamental dimensions, dimensionless parameters, dimensionless Pi's, Pi theorem, English units, metric units, consistent units, inertial units, gravitational units, fixed units, natural units, generalized units, unit and measure, dynamic similarity, thermodynamic similarity, theory of models, Reynolds number, momentum theory of propellers, propeller parameters, turbine parameters, rotorcraft parameters, pump parameters, compressor parameters, performance limits of: propellers, axial turbines, lifting rotors, mathematical invariance of physical equations; http://archive.org/details/dimensionalanaly2031gawa; NA; NA