Showing papers on "Pooling published in 1970"

A methodology for estimating expected usage of repair parts with application to parts with no usage history

Abstract: In this paper a model is presented which focuses on the difficult problem of predicting demands for items with extremely low usage rates. These form the bulk of repair parts in military systems. The basic notion underlying the model is the pooling of usage data for common design items with movement for the purpose of estimating usage rates for similar items which have shown no movement. A unique feature of the model is that it also makes possible the estimation of usage rates for items newly introduced into a system for which no previous usage history is available.

Data-pooling circuits

Abstract: Modular pooling circuits for transferring data Blocks are provided that can be serially coupled in variable length chains of substantially indefinite capacity and provide automatic queuing of the data blocks. To utilize data characters provided in parallel form from a data unit, and to enter these into the pooling chain, each pooling circuit module includes a bidirectional parallel-to-serial converter circuit, a pair of signal repeaters for transferring command and data signals along the chain, and priority selection and signal-switching circuits. Each pooling circuit generates signals at selected frequencies for the command data signals. Each circuit also operates in a repeater mode for both command and data signals treansferred along the chain, until the associated data unit has available data and the pooling circuit occupies the highest position that is requesting priority in the chain. Data and command signals that are transferred along the chain are reconstituted, as to timing and waveform, but otherwise transferred without modification. When locally initiated data and command signals are transferred, lower priority units are effectively disconnected from the chain, and higher priority units are effectively disabled until the transfer is complete.