The article analyses original methods of DGA fault diagnose, include three-ratio method, artificial neural network method, Fuzzy Theory, diagnosing expert system, grey relational algorithm, et.

本文分析了原有的DGA故障诊断方法，包括三比值法、人工神经网络法、模糊理论、变压器诊断专家系统、灰色关联算法等。

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In this paper, the cost estimate system of constructional engineering has been studied based on the theory of Fuzzy Mathematics and Grey system, and a practical computer software has been worked out.

本文利用模糊数学和灰色系统理论，对建筑工程造价估测系统进行了研究，并在此基础上，研制成实用软件。

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The predictive models of fuzzy graph, nonlinear regression and with grey theory are set up from different aspects by analyzing the features of road traffic accidents.

通过分析道路交通事故发生的特点，从不同的角度，建立了模糊图模型、非线性回归模型及基于灰色理论的灰色预测模型。

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