We research on MPEG-4 AAC encoding standards and the algorithm principium. The key point is optimizing the psychoacoustic model module, filter Banks module and quantizer module.

根据MPEG - 4 AAC编码标准及对算法的基本原理的分析研究，算法优化的关键点在于心理声学模型、滤波器组和量化等模块。

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Research on the paper will importantly focus on:Firstly, we will construct the mathematic model of optimizing of physical distribution routing problem with time windows.

此部分是本文研究的重点：首先，建立有时间窗物流配送路径优化问题的数学模型基础。

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This article takes peasants 'cooperative economic organizations as the research object, and focus on optimizing its governance model.

本文以农民合作经济组织为研究对象，着重研究我国农民合作经济组织治理模式的现状以及优化。

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