Article

Application of equivalent information method to high reliability assessment of initiating explosive devices

March 2012

Authors:

The amount of information required for reliability assessment of success/failure products is defined and the formula of equivalent information method is deduced. Based on the formula, a method for assessing reliability of initiating explosive devices with small sample size is established. Compared with the assessment method for devices with large sample size, the new method is correct and feasible and can be used to assess the reliability of initiating explosive devices with high reliability requirements.

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An assessment method of reliability of initiating devices based on information measure equivalency

Article

May 2011

A new method for assessing the reliability of initiating devices based on test information measure equivalency was put forward. According to the principle that more information on reliability from tests on the stress level of low reliability could be gotten over the stress level of high reliability, only one tenth of samples needed by classical method were used to estimate the reliability of 0.999 through test on the stress level of low reliability under the condition of the equivalent information measure obtained by tests between low reliability and high reliability. The assessment result of the new method is consistent with that of the large sample assessment method. The verification test result shows that the new method is feasible for reliability assessment of initiating devices.

Article

Prosody of Dialogues: Influence of Recognition Failure on Local Speech Rate

January 1970

Olga I. Dioubina

The variation in speech rate influences the performance of the automatic information-providing devices and leads to the recog-nition failures in the process of man-machine communication. While this problem has been generally recognized, there are few studies that provide detailed information on the variation in the speech rate in a specific context. Our research focuses on the variation that ... [Show full abstract] occurs in a clearly defined context of recog-nition failure, which evokes an abrupt change in verbal (and non-verbal) behavior on part of the subjects. In addition, the method we applied in measuring the speech rate improves the reliability of the results.

Article

Determining Functional Reliability of Pyrotechnic Mechanical Devices

February 1997 · AIAA Journal

This paper describes a new approach for evaluating mechanical performance and predicting the mechanical functional reliability of pyrotechnic devices. Not included are other possible failure modes, such as the initiation of the pyrotechnic energy source. The requirement of hundreds or thousands of consecutive, successful tests on identical components for reliability predictions, using the ... [Show full abstract] generally accepted go/no-go statistical approach routinely ignores physics of failure. The approach described in this paper begins with measuring, understanding and controlling mechanical performance variables. Then, the energy required to accomplish the function is compared to that delivered by the pyrotechnic energy source to determine mechanical functional margin. Finally, the data collected in establishing functional margin is analyzed to predict mechanical functional reliability, using small-sample statistics. A careful application of this approach can provide considerable cost improvements and understanding over that of go/no-go statistics. Performance and the effects of variables can be defined, and reliability predictions can be made by evaluating 20 or fewer units. The application of this approach to a pin puller used on a successful NASA mission is provided as an example.

Article

Determining the bivariate brightness distribution of galaxies.

March 1995 · Astronomy and Astrophysics

In this paper we describe a set of criteria which we propose a sample of galaxies must satisfy if it is to be useful for determining the bivariate brightness distribution (BBD) of galaxies in luminosity and surface brightness and we consider the prospects for deriving such a sample. First, we note that determinations of the galaxy luminosity function can be seriously in error if surface ... [Show full abstract] brightness (visibility) selection effects are ignored. We suggest that a determination of the BBD is a more physically useful aim. A straightforward way to obtain the BBD would be to determine a luminosity function in a set of narrow surface brightness bins. We propose a set of criteria which the sample of galaxies in each surface brightness bin must satisfy if it is to be reliably used in such a determination. Each sample should be restricted to a well defined range in morphological type, the measured isophotal size and magnitude and the surface brightness of each galaxy should be corrected to a common galactic inclination, all galaxies should have measured redshifts and the sample should be complete to a known isophotal size and/or magnitude. We then describe a rigorous method for selecting samples which satisfy these criteria from existing catalogues of galaxies. We apply this method to the ESO-LV catalogue and find that from the intial sample of 11000 galaxies with a disk component we can only find 5 subsamples in half-magnitude wide surface brightness bins which satisfy our proposed criteria. The largest derived subsample contains only 27 galaxies, far too few to determine a luminosity function at its surface brightness. We suggest that had our proposed criteria been applied to the samples used in previous determinations of the BBD or the galaxy luminosity function then sample sizes would have been greatly reduced. For this reason, we suggest that the conclusions of previous work should be treated with caution.