In this paper, the mathematical foundation study of rough sets and the study of two general rough sets models are mainly researched.

本文主要进行了粗糙集的数学基础研究，与程度粗糙集和变精度粗糙集两个广义粗糙集模型的探讨。

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At the same time, this research also introduces the theory foundation, study purpose and research significance, the research methods and ideas.

同时还介绍了本研究的理论基础，研究目的及意义，以及本文的研究思路和方法。

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2012-2015 The project of National Natural Science Foundation——"Study on differentiation and reconfiguration mechanism and transformation of the specialized market in China".

2012-2015，国家自然科学基金项目-“我国专业市场分化重构机制与转型提升研究”。

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The foundation also started centers for the study of medical ethics at Harvard University and Georgetown University.

VOA: special.2009.08.23

Marie-Noel Vercambre of the Foundation for Public Health in Paris led the study.

VOA: special.2011.07.27

Americas National Science Foundation paid for the study.

VOA: special.2010.03.02

In fact, a Kauffman Foundation study on business and gender shows women are outperformed by men in many areas of business.

FORBES: Connect

In fact, a recent Kauffman Foundation study found that immigrants were unique in boosting their entrepreneurial activities since the onset of the recession.

FORBES: The Best Cities For Minority Entrepreneurs

Gintaras's experience is echoed by a Joseph Rowntree Foundation study into East European immigration and community cohesion, based around interviews with migrants in Brighton and Hove and the London boroughs of Hackney and Harrow.

BBC: Migrants' road to UK integration