Oral liquid drug controlled release system (OLCRS) is a new drug delivery system. 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。

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With rapid development of biotechnology, nano-technology and physical chemistry, research onthe magnetic drug carries becomes domestic and foreign important subject of magnetic drug delivery system.

随着生物技术、纳米技术和物理化学等多学科的飞速发展，磁性药物戡体的研究成为国内外导向药物领域的热门课题。

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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.

然而，现有上下文服务基础设施较少考虑与物理空间的对应关系，并在系统规模、服务提供方式、扩展性等方面存在局限。

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