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Chihiro Nakagawa,Yoshihiro Suda,Kimihiko Nakano,Shoichiro Takehara 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4
Recently, the personal mobility vehicle (PMV), a vehicle suitable for personal use, has been developed. It moves at low speed and is sufficiently small that it can be ridden in pedestrian space. This vehicle is expected to be a new method of transportation that is practical and environmentally friendly. As one form of PMV, the authors propose a twowheel vehicle with two modes: a two-wheel steering and two-wheel driving bicycle mode and a parallel two-wheel mode. This vehicle has four electric motors, two for driving and two for steering, and one generator connected to the pedals. In the bicycle mode, the rider rotates the pedals to generate electric power, and the motors in the wheels produce torque using the generated energy. The front and rear wheels are steered by the electric motor according to the angle of the handle. Therefore, this bicycle is controlled by a steer-by-wire and a drive-by-wire system. In the parallel two-wheel mode, the vehicle is stabilized according to the theory of the inverted pendulum. In this paper, we focus on the bicycle mode and analyze its stability. Stabilizing the bicycle is not easy since the proposed vehicle has tires with small diameters and the traveling speed is assumed to be low. It is known that the stability of bicycles is tuned by adjusting the bicycle parameters and changing the rear steer angle. However, since we aim to use the vehicle in a narrow walking space at low speed, such conventional methods are not always suitable. The authors propose the stabilization of the bicycle using driving forces and design a controller using linear-quadratic control theory. The results of the numerical simulations show the proposed method is effective in stabilizing the bicycle.
STUDY OF SPECTRAL ENERGY DISTRIBUTION OF GALAXIES WITH PRINCIPAL COMPONENT ANALYSIS
Chihiro Kochi,TAKAO NAKAGAWA,Naoki Isobe,MAI SHIRAHATA,Kenichi Yano,Shunsuke Baba 한국천문학회 2017 天文學論叢 Vol.32 No.1
We performed Principle Component Analysis\,(PCA) over 264 galaxies in the {\it IRAS} Revised Bright Galaxy \blue{Sample \citep{Sanders2003}} using 12, 25, 60 and 100\,$\mu$m flux data observed by {\it IRAS} and 9, 18, 65, 90 and 140\,$\mu$m flux data observed by {\it AKARI}. We \blue{found} that (i)the first principle component \blue{was} largely contributed by infrared to visible flux ratio, (ii)the second principal component \blue{was} largely contributed by the flux ratio between {\it IRAS} and {\it AKARI}, (iii)the third principle component \blue{was} largely contributed by infrared colors.
Coiling Temperature Controlusing Fountain Pyrometers in a Hot Strip Mill
Shigemasa Nakagawa,Tatsuro Honda,Hisayoshi Tachibana,Chihiro Uematsu,Yasuhiko Buei,Koichi Sakagami 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In the hot strip mill, the quality of the strip greatly depends on the cooling process between the last stand in the finishing mill and the coilers. Therefore, it is important to carefully control the coiling temperature to regulate the mechanical properties of the strip. To realize high temperature accuracy, a new coiling temperature control using fountain pyrometers has been developed. In this paper, the basic concept and operating results of the coiling temperature control using fountain pyrometers are described.
Newly Developed Fountain Pyrometer for a Running Hot Strip in the Cooling Banks of a Hot Strip Mill
Tatsuro Honda,Shigemasa Nakagawa,Chihiro Uematsu,Hisayoshi Tachibana,Yasuhiko Buei,Koichi Sakagami 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Temperature control of a hot strip has been important in run-out table of hot strip mill in order to stabilize and improve the material properties of its products. We developed a new temperature measurement method for hot stripcooled by a lot of water in the cooling banks. And we developed control system using the new measurement method and confirmed that the system could control hot strip temperature accurately. We explain the principle of the new measurement method and its online test result in this paper.
AN EXTENSION OF A RELIABLE WAVELENGTH COVERAGE OF THE AKARI NG GRISM MODE
Shunsuke Baba,TAKAO NAKAGAWA,NAIKI ISOBE,MAI SHIRAHATA,YOUICHI OHYAMA,KENICHI YANO,CHIHIRO KOCHI 한국천문학회 2017 天文學論叢 Vol.32 No.1
The Infrared Camera onboard the \textit{AKARI} satellite carried out spectroscopic observations with a grism mode named \textit{NG}, whose wavelength coverage was 2.5--5.0~$\mu$m. We reinvestigate the current flux calibration for the \textit{NG} grism mode, with which calculated flux density implausibly decreases at 4.9~$\mu$m especially for red objects due to the second-order light contamination. We perform a new spectral response calibration using blue and red standard objects simultaneously. New response curves which contain both the first- and second-order light are able to separate each contribution consistently and useful for studies of red objects such as CO ro-vibrational absorption in active galactic nuclei.