In this paper, we show that for any independence system, the problem of finding a persistency partition of the ground set and that of finding a maximum weight independent set are polynomially equivalent.

Abslmct-In an overparametrized model reference adaptive control & r ) = dt)r(') system, the measured signal n(t) cannot he persistently exciting (PE) I + rT(r )r ( t ) for any hounded reference input r ( t ) . The controller parameter vector for model-plant transfer function matching lies in a linear variety in the where = y ( t ) ~ y , , 3 ( t ) p ( t ) { ( t ) ~ , ( ~ ) p ( r ) ~ ( r l ,...

The objective of this study was to investigate the phenotypic relationship between common health disorders in dairy cows and lactation persistency, uncorrelated with 305-d yield. The relationships with peak yield and days in milk (DIM) at peak were also studied. Daily milk weights and treatment incidence records of 991 Holstein lactations from experimental dairy herds at Virginia Tech and Penns...

The objectives were to estimate (co)variance components and genetic parameters for lactation curve traits in Holstein dairy cows in Iran. The used data were records on Holstein cows collected during January 2003 to December 2012 by the Animal Breeding Center of Iran (Karaj, Iran). In order to describe the lactation curve, an incomplete gamma function was fitted to 691200 test-day records on 962...