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Development of a Timberjack-like Pruning Robot
W. Chonnaparamutt,H. Kawasaki,S. Ueki,S. Murakam,K. Koganemaru 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A hybrid novel climbing pruning robot responding the requirement of sustainable forest management is presented. The climbing principal is imitated climbing approach of timberjacks in Japan. Main features include the locating of center of mass of the pruning robot outside of tree and the innovative climbing strategy fusing the straight and spiral climbs. Four active wheels are set at regular intervals around the tree allowing the robot to move along the tree. This novel design provides both lightweight and high climbing speed features of the pruning robot. The development progress of the robot with the experimental results of hybrid climb is reported here. Furthermore, the fuzzy velocity controller is also introduced with a promising experimental result.
낙뢰의 3차원 관측 위한 AOA 방식 낙뢰감지기 설계에 관한 연구
禹貞旭(J. W. Woo),郭周植(J. S. Kwak),文在德(J. D. Moon),河崎善一郞(Zenichiro Kawasaki) 대한전기학회 2006 전기학회논문지C Vol.55 No.11
Since 1996, KEPCO has been operating a wide range lightning detection system, LPATS, and been accumulating relative application techniques and statistical analysis skills. So, KEPRI already has its own basis to develope more accurate advanced detection technology and references to do comparative study. For three-dimensional imaging of lightning channels, UHF/VHF antenna systems were installed at 2 sites. The distance between two sites is about 30 ㎞. These systems were used the AOA(Angle of Arrival) methods for lightning detection. In this paper, we would like to introduce about our system and its results.
WIDE-FIELD IMAGING WITH MOSAIC CCD CAMERAS
OKAMURA S.,DOI M.,KAWASAKI W.,KOMIYAMA Y.,SHIMASAKU K.,YAGI M.,YASUDA N.,KASHIKAWA N.,SEKIGUCHI M. The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
An outline is given of our development of mosaic CCD cameras. Hardware and data reduction software of two operational cameras are described. Scientific objectives of wide-field imaging with the cameras are briefly described.
Zhou, W.,Yamamoto, G.,Fan, Y.,Kwon, H.,Hashida, T.,Kawasaki, A. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.106 No.-
<P>Quantitative characterization of interfacial shear strength (IFSS), in multi-walled carbon nanotube (MWCNT)-reinforced Al matrix composites, has been carried out using an in-situ pull-out technique. The end of an MWCNT protruding out of the tensile fracture surface of the composite was bonded to the tip of an atomic force microscopy (AFM) cantilever using an electron-beam-induced deposition method. The MWCNT was pulled out from the Al matrix using a nanomanipulator system installed inside a scanning electron microscope (SEM). The effective embedded length of the MWCNT incorporated in the Al matrix was evaluated by observing the pulled out MWCNT under high-resolution transmission electron microscopy (HRTEM). Valid results were obtained for six MWCNTs with straight, visibly damage-free embedded parts nearly perpendicular to the fracture surface. The IFSS between the MWCNT and the Al matrix was 24.8 +/- 3.2 MPa. The ultimate tensile strength (UTS) of the MWCNT/Al composites is in good agreement with that estimated by the shear lag model using these IFSS values, resulting in the realization of 60% load transfer efficiency at the directly contacted MWCNT-Al interface in the MWCNT/Al composites. No MWCNT failure was observed during the pullout in this study. (C) 2016 Elsevier Ltd. All rights reserved.</P>