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Early Disease Detection of Bacterial Leaf Blight on Rice Plant by using Hyperspectral Imaging
( M Naufal Rauf Ibrahim ),( Takashi Okayasu ),( Atsushi Yoshimura ),( Yoshiyuki Yamagata ),( Naruto Furuya ),( Eiji Inoue ),( Yasumaru Hirai ),( Muneshi Mitsuoka ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
In Southeast Asia, bacterial leaf blight (BLB) is one of the significant rice diseases that potentially causes productivity loss up to 50%. The early stage disease detection contributes to prevent the serious crop damage due to the disease outbreak. The hyperspectral imaging provides an extension of our vision by capturing the near infrared (NIR) region at 700-1000 nm which is the outside of visible light (VIS) region at 400-700 nm. In this study, the possibility of early stage disease detection method of BLB on rice plant was investigated in captured hyperspectral images with 40-50 cm from the top of rice plant. For early disease setting, the hyperspectral images for both the healthy and infected single leaf of the rice plants, both were taken from 2 days post-inoculation when the symptom had not been shown yet. The possible sensitive bands were explored from VIS to NIR and chosen by applying the principal component analysis (PCA) on reflectance value of the healthy and infected leaves using 400-850 nm. The PCA result provided that there several ranges of wavelength have high correlation with the disease development on early stage and found that the ratio of orange-red color (605-640 nm) and red edge (690-720 nm) has the highest possibility to detect the BLB.
Study of a Spherical Ultrasonic Motor for Haptic Display System
Ryota Ishibashi,Tomohiro Ohara,Naoyuki Takesue,Jumpei Arata,Shigeki Toyama,Masahiko Hoshina,Yoshiyuki Hirai,Naoki Fukaya,Hideo Fujimoto 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
In this paper, we examine a Spherical Ultrasonic Motor(SUSM) for the haptic display system. Experimental system consists of a force sensor and a SUSM comprising one spherical rotor and three ring-shaped stators. The stator is made from an elastic body and piezoelectric elements for vibration. The stators and the rotor are in pressure contact with each other. The frequency and the phase difference the stators" vibration can be controlled and we can generate torque of the rotor. Some experiments were briefly investigated to examine the performances of the proposed haptic display method.