Methods Core tablets containing osmotic active agent were prepared by direct compression and spray coated with swelling layer and semipermeable membrane subsequently.

方法粉末直接压片法制备含渗透活性物质的片芯，滚转包衣锅法分别包溶胀层和控释衣层。

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Digital compression techniques is the core technology of digital television.

数据压缩技术是数字电视的核心技术。

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Through analyzing the core algorithm of the JPEG2000, this paper describes the image compression process and the advantages of the JPEG2000 compared with the previous standards.

通过对JPEG2000中核心算法的分析，阐述了JPEG2000压缩过程以及与现有压缩标准相比显示出来的优越性能。

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