It is shown that “at-sea” measurements of the transverse waves generated by a deep-draught ship can be used to determine the course and speed of the ship and its distance from the point of measurement. Three staff g...
It is shown that “at-sea” measurements of the transverse waves generated by a deep-draught ship can be used to determine the course and speed of the ship and its distance from the point of measurement. Three staff gauges in a close proximity are required along with telemetering equipment and a spectral analyzer. By continuously monitoring the wave spectra at three points, the transverse waves in the ship's wake are detected as spikes in each of the spectra. A narrow band about the transverse wave period can then be monitored to obtain the necessary information.
The computer generation of pseudorandom variates from the beta distribution is discussed. Three exact methods applicable for parameter values p > 1 and q > 1 are presented. All three are acceptance/rejection met...
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The computer generation of pseudorandom variates from the beta distribution is discussed. Three exact methods applicable for parameter values p > 1 and q > 1 are presented. All three are acceptance/rejection methods, based on functions of the location of the mode and points of inflection. The methods differ in the amount of the set-up required, with higher set-up times generally resulting in lower marginal generation times. Generation times are compared to four methods in current use: ratio of gamma variates, and the methods of Johnk, Ahrens and Dieter, and Cheng. Over a wide range of parameter values marginal generation times are reduced. [ABSTRACT FROM AUTHOR]
作者：
Spurrier, John D.Wei, L. J.Associate Professor
Director Statistical Laboratory Department of Mathematics Computer Science and Statistics University of South Carolina Columbia SC 29208
Consider a life-testing experiment subject to Type I censoring, where m items are put on test at the outset and are not replaced on failure. Assume an exponential failure distribution F(t) = 1 - exp (-t/theta). A test...
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Consider a life-testing experiment subject to Type I censoring, where m items are put on test at the outset and are not replaced on failure. Assume an exponential failure distribution F(t) = 1 - exp (-t/theta). A test of H[sub 0]: theta is greater than or equal to versus H[sub 1]: theta < xi based on the maximum likelihood estimator of theta is proposed. It is shown that early termination of the test resulting in either acceptance or rejection of Ho is possible. Critical points are presented. The test is shown to compare favorably with a test presented by Epstein (1954) in terms of power and expected duration time. A comparison of the test with the untruncated and truncated sequential probability ratio test is also made. [ABSTRACT FROM AUTHOR]
If data on an auxiliary variable X correlated with the variable Y under study are available, regression-type estimators are often used to estimate the population mean mu[sub y]. An estimator based on a preliminary, te...
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If data on an auxiliary variable X correlated with the variable Y under study are available, regression-type estimators are often used to estimate the population mean mu[sub y]. An estimator based on a preliminary, test of significance that chooses between the difference estimator and the regression estimator has been proposed. This article investigates the efficiency of the proposed regression-type estimator with respect to other regression-type estimators. [ABSTRACT FROM AUTHOR]
A modification of the quadratic form involved in a generalized minimum chi-squared procedure yields the same asymptotic null distribution of the test statistic for testing fit by an assumed model, but a different form...
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A modification of the quadratic form involved in a generalized minimum chi-squared procedure yields the same asymptotic null distribution of the test statistic for testing fit by an assumed model, but a different form of nonnull distribution emerges. This result is applied to testing fit of the negative binomial and Neyman Type A distributions, and tables of asymptotic power are presented that show the increase of power obtained. A numerical example is presented to illustrate the technique. [ABSTRACT FROM AUTHOR]
This paper presents an integrated approach to computer-Aided Ship Design for U.S. Navy preliminary and contract design. An integrated Hull Design System (HDS), currently under development by the Hull Group of the Nava...
This paper presents an integrated approach to computer-Aided Ship Design for U.S. Navy preliminary and contract design. An integrated Hull Design System (HDS), currently under development by the Hull Group of the Naval Sea Systems Command (NAVSEA 32). is the vehicle for the discussion. This paper is directed toward practicing ship design professionals and the managers of the ship design process. Primary emphasis of this paper, and of the development effort currently under way, is on aiding ship design professionals in their work. Focus is on integration and management control of the extremely complex set of processes which make up naval ship design. The terminology of the Ship Designer and Design Manager is used. The reader needs no familiarity with the technologies of computerscience.
A project of the Education Board of the Association for Computing Machinery, sponsored by the National science Foundation, to review computer impact on society and computer literacy courses and materials is presented....
A project of the Education Board of the Association for Computing Machinery, sponsored by the National science Foundation, to review computer impact on society and computer literacy courses and materials is presented. The effort to gather and maintain a comprehensive bibliography in the area is reviewed and an analysis of the literature currently included is given. A set of objectives for courses is specified. Future plans are discussed including the organization of a workshop to facilitate the preparation of course syllabi and to refine and enhance the bibliography.
MACSYMA is a large LISP system which performs symbolic manipulations such as differentiation, simplification, integration and solution of equations with parametric coefficients. After exhibiting various examples of th...
ISBN:
(纸本)9781450374408
MACSYMA is a large LISP system which performs symbolic manipulations such as differentiation, simplification, integration and solution of equations with parametric coefficients. After exhibiting various examples of the system, we shall present some of the data representations used by MACSYMA to model abstract algebraic structures such as polynomial *** references are given for those wishing more introductory information about MACSYMA.
Current research and problems in math, science and engineering education are reviewed and concepts of thinking and learning are discussed in terms of psychometrics. Systems models for learning, the teaching environmen...
Current research and problems in math, science and engineering education are reviewed and concepts of thinking and learning are discussed in terms of psychometrics. Systems models for learning, the teaching environment, and learner-teacher interaction are presented and discussed. An approach to assessment, enabling the teacher to use personally preferred measurement criteria, is offered as is strong argument in favor of using simulation in engineering and science education. Assessment methodology is discussed.
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