[IEEE 2014 Joint 7th International Conference on Soft Computing and Intelligent Systems (SCIS) and 15th International Symposium on Advanced Intelligent Systems (ISIS) - Kita-Kyushu, Japan (2014.12.3-2014.12.6)] 2014 Joint 7th International Conference on Soft Computing and Intelligent Systems (SCIS) and 15th International Symposium on Advanced Intelligent Systems (ISIS) - Constructive method for appropriate membership function integrating fuzzy entropy with smoothing function into interval estimation