![]() These units connected to an embedded NC service system providing abundant functions and higher processing abilities through networks to acquire the. In this system, embedded controllers connected by field buses composed the basic NC unit. The authors put forward a new kind of embedded NC system based on resources sharing. New requirements for current network numerical control (NC) were discussed. Using the method of moments to estimate parameters, it was found that interarrival times could best be characterized by a gamma distribution, while connect, inactive CPU, and active CPU times approximated exponential distributions. Since a normal distribution could not be fitted to the data, it was concluded that the pattern of daily arrivals was best treated as an empirical distribution. An analysis of variance established that the group category largely determined the volume of arrivals. To facilitate analysis, four user groups were formed. inactive CPU time (swapping time), and connect time (duration of a user session). Five traffic measures were extracted from a week's job accounting records: arrival time (time of day of log on), interarrival time (time between successive arrivals), active central processing unit (CPU) time (user's time slice). ![]() ![]() ![]() The purpose of the study was to characterize the input traffic on the interactive terminal facility (ITF) at Jackson State University by mathematical distributions.
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