Development of Kansei design method using rough sets and research of its application

粗糙集理论由波兰教授于1982年提出，至今已有二十多年的历史。然而，尽管对应用的期望很高，但迄今为止，国际上的许多研究都是理论研究。日本的应用研究始于几年前。然后，通过大量的应用案例研究，发展和改进了适合于实际应用的粗糙集技术，主要是发展和改进了我们提出的决策规则分析方法，这些决策规则是由粗糙集的结果得到的许多if-then规则。在应用研究中，粗糙集理论的数学技术的发展和粗糙集理论计算前的准备工作都显得尤为重要。例如，它们是如何获得适合于具体案例研究的数据表的属性或属性值，以及如何确定其决策类等。它们对于考虑分析结果也是有用的。然后，通过对各领域的实例研究，设计了利用评价网格法获取属性或属性值的方法和利用频数分布的观点确定判定类别的方法，并进行了应用研究。这些应用研究分别是产品开发领域（个人CD播放器）、平面设计领域（化妆品）、界面设计领域（个人数字音频播放器）、营销领域（移动的电话）和建筑设计领域（外观设计）。此外，作为应用研究的结果，发现粗糙集还有助于与创造力相关的设计概念的制定。并提出了通过案例研究来形成设计概念的方法。

The history of Rough sets which was proposed by the professor of Poland in 1982 already becomes twenty years or more. However, although the expectation for the application was great, many of the researches were theoretical ones in the world until now. The applied research in Japan began from several years ago. Then, the purpose of this research was development and improvement of the technique of Rough sets suitable for application through many application case studies.In this research, we mainly developed and improved the method of analyzing Decision rules proposed by us which are many if-then rules obtained from the result of Rough sets. Not only development of the mathematical technique of Rough sets but also the preparatory step before its calculation becomes important at the applied research. For example, they are how to obtain an attribute or an attribute value of a data table suitable for a concrete case study and how to decide Decision class of it, etc. They are useful also for considering the analysis result. Then, through the case study of each field, we devised the method of obtaining an attribute or an attribute value by use of the evaluation grid method and the method of deciding the determination class by use of the view of frequency distribution, and we did the application research. These application researches were the product development field (personal CD player), the graphic design field (cosmetic product), the interface design field (personal digital audio player), the marketing field (mobile telephone), and the architecture design field (facade design).In addition, it was found out that Rough sets contributed also to design concept 'making related to creativity as the result of application researches. We also proposed the method of making a design concept through case studies.