Utility functions的用法和樣例：
例句
- Secondly, to extract learning samples from the MADM problem, an approach to estimating the utility functions for attributes is presented.
其次，提出了基於屬性效用函數估計的學習樣本構造方法，從決策問題本身抽取學習樣本。 - In the first part of this paper, we introduce briefly the background and recent research of recursive utility.
本文第一章首先對遞歸效用函數的背景及研究近況作了一個簡要的介紹。
