As for subspace based MUD, two improved algorithms are shown from the point of view of subspace tracking to solve the problems of slow tracking and unstable performance in traditional methods.

对于基于子空间的多用户检测算法，本文主要从子空间跟踪角度入手，针对传统方法跟踪速度慢，性能不稳定的问题，提出了两种改进算法。

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For instance, he plans to prod dealers to part with cars more quickly by tracking their inventory and alerting them to slow-moving vehicles.

FORBES: Magazine Article

The goal is to provide users a place to click in the ad itself that would let them opt out of receiving such targeted ads. (It doesn't turn off tracking altogether.) The program has been slow to catch on, new findings indicate.

WSJ: Latest in Web Tracking: Stealthy 'Supercookies'

Satellite and space expert Dr Stuart Eves stressed the large uncertainties involved in tracking the "decay" of satellite orbits (their slow fall back into the Earth's atmosphere).

BBC: Nasa refines satellite crash time