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Evaluation of a Fine-coarse Mechanism
Yoshitaka Morimoto 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A new positioning system has been developed to realize both the fine motion and the coarse motion independently and/or simultaneously to reduce the positioning time under the limitation of guaranteeing the positioning accuracy. To cope with this problem, the conventional reducer unit driven by AC servomotor is utilized. The fine-coarse motion of the developed mechanism is realized by only mechanical parts consisted of two servomotors and a harmonic drive speed reducer aligned in an axis. The main characteristic is that there are no stroke limitations in the fine and coarse motions with respect to the conventional fine-coarse motion stage by usage of the PZT device. The basic performances of angular positioning are evaluated by the feedback positioning system. The paper reports the fine and coarse positioning performances of the developed system.
A Study on Effects of Artificial Structures on Bryophyte Diversity in Urban Greenery
Yoshitaka Ohishi,Ukihiro Morimoto Korean Institute of Landscape Architecture 2004 Journal of the Korean institute of landscape archi Vol.2 No.-
It is important to consider urban parks and greenery not only from the viewpoint of amenity or aesthetics but also from the viewpoint of biodiversity. In this study, we focused on bryophytes (mosses), and analyzed how existence of artificial structures in urban greeney, such as concrete curbs and stone walls, affect species diversity of bryophytes. Kyoto Gyoen in Kyoto City, western Japan, was selected as the study site. In consideration of kinds of substrates on which bryophytes grow, microhabitats of Kyoto Gyoen were divided into ten types including concrete curbs and stone walls. In each type of microhabitats, we selected the area where bryophyte diversity was highest, and established a quadrat for bryophyte flora survey. Our results showed that the number of bryophyte species and growth forms and the value of diversity indices on concrete curbs or stone walls were higher than the averages of those. The bryophyte species were divided into the four groups by TWINSPAN as follows: Group A (epiphyte species), Group B (rocky species), Group C (roadsides, grassland or forest species), and Group D (waterside species). Bryophytes classified into Group B (rocky species) were mainly recorded on concrete curbs or stone walls. It was considered that the existence of artificial structures (concrete curbs and stone walls) provided favorite habitats for the bryophytes classified into Group B (rocky species), which mainly grows on concrete or rocks, and enhanced species diversity of bryophytes in Kyoto Gyoen.
Fast Reprojection using Tree-Structured Filter Bank from Cone Beam Projections
Hiroaki MORIMOTO,Kazuhiro UEDA,Yoshitaka MORIKAWA 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper proposes a fast reprojection method using Tree-Structured Filter Bank from cone beam projection data and shows that we can calculate 4.6 times faster than the conventional interpolation method.