生產過程中設置於一定條件的最佳製程參數可以了解產品的利潤，是為最重要的其中一環；每個品質特徵均有一理想目標值，在Chang et.al(2009)的文章中，我們討論某個品質特徵為”越大越好”時，最佳解仍存在的條件，為方便論本文以多變量對數常態分配為品質特徵的基本假設。

Optimum process parameters in the production process to set certain conditions to understand margin products, is one of the most important ring; each quality characteristics are an ideal target, in Chang et.al (2009) article, we discuss a condition characterized by the quality of "bigger is better", the optimal solution still exist on this paper to facilitate the multivariate normal distribution of the number of quality characteristics of the basic assumptions.

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