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Autonomous Identification of Debris’ Impact Craters Utilizing Range Image Sequence
Koki Fujita 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this study, a new approach to autonomously detecting areal distribution of the small debris’ impact craters on the surface of spacecraft is proposed. The proposed method is implemented by utilizing a series of the range images captured with 2D scanning range sensor in a stationary motion. In order to precisely extract the spherical pitted areas on the planar surfaces, some invariant parameters with 3D curvatures are utilized, and the range sensor’s motion parameters are estimated from the flow data appearing in the range image sequence. The validity of the proposed method is checked through some fundamental experiments by using synthetic and real range image sequences.
Design and Implementation of Hand Pose Rally System based on Image Processing
Koki Nishi,Yuichi Kunitomo,Akira Suganuma 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
The purpose of this research is the construction of the stamp rally system distinguishing with participant"s hand shapes. We have realized by the image processing to distinguish the hand shapes and evaluated accuracy. And we have designed the data communication between the server and the checkpoint.
Koki Ogura,Tomomasa Nishida,Osamu Noro,Mutsuo Nakaoka,Hyun-Woo Lee 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a novel prototype circuit topology with dual mode control scheme of a high efficiency time-sharing single-phase sinewave PWM inverter for small scale new energy power generation system, which is composed of partially controlled sinewave absolute PWM boost chopper in the first power processing stage as well as partially controlled sinewave PWM full-bridge inverter in the second power processing stage. Its unique operating principle of two power processing stage with time-sharing dual mode sinewave<br/> modulation strategy is described in addition to an implemented example. Finally, this new conceptual single-phase sinewave<br/> PWM inverter with sinewave absolute PWM controlled boost chopper is evaluated and discussed on the basis of simulation and experimental results. The effectiveness of proposed power conditioner is proved from a practical point of view.
Koki Ogura,Srawouth Chandhaket,Mutsuo Nakaoka,Haruo Terai,Shinichiro Sumiyoshi,Takeshi kitaizumi,Hideki Omori 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
The utility interfaced sinewave modulation inverter for the solar photovoltinec power conditioner with a high frequency transformer is presented for residential applications. As compared with the conventional full-bridge hard switching sinewave PWM inverter with a high frequency link, the simplest single-ended edge-resonant soft switching sinewave inverter with a sinewavc duty cycle pulse control scheme is Implemented, resulting in size and weight reduction, low cost and high efficiency This paper presents a prototype system of the sinewave zero voltage soft switching sinewave inverter for solar power conditioner, along with its operating principle and unique features In addition to these, this paper discusses a control implementation to deliver high quality output current. Major design of each component and the power loss analysis under actual power processing is also discussed and evaluated from an experimental point of view A newly developed utility-connected sinewave power conditioning circuit which achieves 92 5% efficiency under 4kW output is demonstrated
Evaluation of Histological Changes in Back Muscle Injuries in Rats over Time
Koki Abe,Kazuhide Inage,Yoshihiro Sakuma,Sumihisa Orita,Kazuyo Yamauchi,Miyako Suzuki,Go Kubota,Yasuhiro Oikawa,Takeshi Sainoh,Jun Sato,Kazuki Fujimoto,Yasuhiro Shiga,Hirohito Kanamoto,Kazuhisa Takaha 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.1
Study Design: Animal model study. Purpose: The purpose of this study was to evaluate the histological variation in the injured muscle and production of calcitonin generelated peptide in rats over time. Overview of Literature: Vertebral surgery has been reported to cause atrophy of the back muscles, which may result in pain. However, few reports have described the time series histological variation in the injured muscle and changes in the dominant nerve. Methods: We used 30 male, 8-week-old Sprague-Dawley rats. The right and left sides of the paravertebral muscle were considered as the injured and uninjured sides, respectively. A 115 g weight was dropped from a height of 1 m on the right paravertebral muscle. Hematoxylin and eosin (H&E) staining of the muscle was performed 1–3 weeks after injury for histological evaluation. Fluoro-Gold (FG) was injected into the paravertebral muscle. The L2 dorsal root ganglia on both sides were resected 1, 2, and 3 weeks after injury, and immunohistochemical staining for calcitonin gene-related peptide was performed. Results: H&E staining of the paravertebral muscle showed infiltration of inflammatory cells and the presence of granulation tissue in the injured part on the ipsilateral side 1 week after injury. Muscle atrophy occurred 3 weeks after injury, but was repaired via spontaneous replacement of muscle cells/fibers. In contrast, compared with the uninjured side, the percentage of cells double-labeled with FG and calcitonin gene-related peptide in FG-positive cells in the dorsal root ganglia of the injured side was significantly increased at each time point throughout the study period. Conclusions: These results suggest that sensitization of the dominant nerve in the dorsal root ganglia, which may be caused by cicatrix formation, can protract injured muscle pain. This information may be helpful in elucidating the underlying mechanism of persistent pain after back muscle injury.
Simultaneous Online Estimation of Lander’s Motion and Terrain’s 3D Shape Utilizing Imaging Sensors
Koki Fujita 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
This paper proposes a novel estimation technique to simultaneously identify both lander's motion and 3D shape of planetary terrain utilizing two types of imaging sensors. The proposed scheme is realized by utilizing camera and 2D scanning range sensor in a mutually complementary manner. The motion estimation algorithm in the scheme is derived from a state-space model with the lander's 6DOF velocities and the concept of Extended Kalman Filter (EKF). The observation equation for the state-space model is based on a relationship between the lander's motion and the scene points' optical flows in image frames, which is called ‘Image Jacobian’. Although the above estimation algorithm needs the depth data of some scene points selected in the image frames, they are not necessarily measured from the range images because of the range sensor’s low scan rate. Thus, another online estimation algorithm for the 3D locations of the selected scene points is preliminarily applied. On the other hand, DEM for all the scene points in the image frame is recovered every sampling time by the approach similar to the previously mentioned online estimation algorithm. Finally, to demonstrate the effectiveness of the proposed scheme, a series of numerical simulations are conducted.