Abstract In this paper we have presented a detailed simulation study of a distributed multiversion and a distributed two-phase locking concurrency control mechanisms. Our experiment concentrated on measuring the effect of message overhead, read:write ratios, data partitioning and partial replication on the performance of these mechanisms. The effect of these parameters has not been investigated...

Abstract For the bearings-only target tracking for single array, performance of extended kalman filter algorithm in cartesian coordinates and modified polar is studied. The result shows that more general than coordinates. In addition, these two algorithms decreases with an increase azimuth measurement error.

Statistically homogeneous flows obey exact kinematic relations. The Betchov homogeneity constraints (Betchov, J. Fluid Mech. , vol. 1, 1956, pp. 497–504) for the average principal invariants of velocity gradient are among most well-known and extensively employed These relations have far-reaching implications coupled dynamics strain vorticity, as well turbulent energy cascade. Whether only possi...

This letter presents a novel wideband metal-only transmitarray (TA). Up to date, existing works on TAs use at least three layers spaced by air gaps. Compared these designs, the presented TA has only two and can realize full 360 phase shift with low insertion loss wide bandwidth. The unit cell consists of metal connected post converts linearly polarized incident wave orthogonal direction. type c...