...erative Reducing and Clustering using Hierarchies)方法等。 2.3基于模型的方法 基于模型的方法(Model-based methods)是从文本集合中学习一个模型，每个模型代表一个文本类，并优化给定的数据和数学模型之间的适应性。
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A layered sampling model for fuzzy comprehensive evaluation was developed based on simple random sampling methods.
在简单随机抽样方法的基础上提出了分层抽样的模糊综合评价模型。
The main results are: (1) For a dual-rate sampled system, the design methods of predictive controller based on state-space model and input-output model are given respectively.
论文的主要结果有(1)对双速率采样系统，分别给出了基于状态空间模型和输入输出模型下的预测控制器的设计方法。
Based on the study of designing pattern of multi-dimensional data model, three designation methods are pointed out.
研究了多维数据模型的设计模式，给出了三种主要的设计方法。
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