Suchergebnisse

This article describes the development and implementation of a program to train a large-scale, semi-automatic data processing system known as SAGE (Semi-Automatic Ground Environment). Particular attention is given to describing the the air defense system, the methodology used to satisfy the training requirements, the conduct of the training program in operational settings, and results of various studies of training effectiveness. Of significance was the emergence of a unique conceptual formulation of system training principles and of associated simulation techniques.

The Internat'l Data Library & Reference Service (IDL&RS) was established by the Survey Res Center & the Instit of Internat'l Studies to assist soc sci'ts at the U of Calif in obtaining, processing, & analyzing existing domestic & foreign survey materials. The service also provides assistance in the collection of new survey data in the US & other countries, & is used as a training laboratory for various U courses of instruction. (See SA 0104-B2279) G. Speal.

SummaryStatistics and traffic.Traffic defined as the collectivity of moving (andparked) vehicles, is the direct consequence of transportation needs as they occur in society as a result of economic and social activities. Hindrances to the free flow of traffic result in decrease and even stagnance of human activities. The correct functioning of traffic facilities is imperative to modern human society.To solve traffic engineering problems, present and future traffic loads must be determined and traffic behaviour in relation to geometric road design must be known. As the volume and character of human activity fluctuates and changes in time, traffic loads will vary in volume and character. Any parameter used to indicate traffic load (volume, speed, etc.) has no well determined value but rather should be evaluated by describing its frequency distribution (histogram). The traffic engineer should not design for the average value, because the facility would not render the expected services whenever a value higher than average would occur. Nor should he design for the highest value, because then the facility will be underloaded, and therefore uneconomical, except when this exceptionally high value occurs. This is illustrated in case of determining the "design speed" for a curve in a road and of determining the "design‐volume" for a road‐crosssection.To determine the histograms of the various design‐factors numerous observations of actual traffic are required. The survey programs should be well correlated with the data which are required for designwork to limit scope and cost. Often, sampling will render data of sufficient accuracy; the required accuracy being set by the design engineer. The statistician will render essential services in determining the size of samples, the survey programs and supervising the correct processing of data.The statistical problems involved in traffic‐behaviour research work are even more challenging because many of the factors involved are not known and should be detected through large series of observations.