Oral liquid drug controlled release system (OLCRS) is a new drug deliverysystem. But only a few has been come into the market due to the physical instability.
口服液体控释给药系统是一种新型药物传递系统，因其存在物理不稳定性，所以能上市的品种较少。
2
With rapid development of biotechnology, nano-technology and physical chemistry, research onthe magnetic drug carries becomes domestic and foreign important subject of magnetic drug deliverysystem.
However, the existing context service infrastructure rarely considers the relationship to physical space, and they are limited with respect to system size, service delivery, scalability, etc.