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Syoji Kobashi,Satoshi Fujimoto,Takayuki Nishiyama,Noriyuki Kanzaki,Takaaki Fujishiro,Nao Shibanuma,Kei Kuramoto,Masahiro Kurosaka,Yutaka Hata 한국지능시스템학회 2010 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.10 No.1
For developing navigation system of total hip arthroplasty (THA) and evaluating hip joint kinematics, 3-D pose position of the femur and acetabulum in the pelvic coordinate system has been quantified. The pelvic coordinate system is determined by manually indicating pelvic landmarks in multidetector-row computed tomography (MDCT) images. It includes intra- and inter-observer variability, and may result in a variability of THA operation or diagnosis. To reduce the variability of pelvic coordinate system determination, this paper proposes an automated method in MDCT images. The proposed method determines pelvic coordinate system automatically by detecting pelvic landmarks on anterior pelvic plane (APP) from MDCT images. The method calibrates pelvic pose by using silhouette images to suppress the affect of pelvic pose change. As a result of comparing with manual determination, the proposed method determined the coordinate system with a mean displacement of 2.6 ± 1.6 mm and a mean angle error of 0.78 ± 0.34 deg on 5 THA subjects. For changes of pelvic pose position within 10 deg, standard deviation of displacement was 3.7 mm, and of pose was 1.28 deg. We confirmed the proposed method was robust for pelvic pose changes.
Kobashi, Syoji,Fujimoto, Satoshi,Nishiyama, Takayuki,Kanzaki, Noriyuki,Fujishiro, Takaaki,Shibanuma, Nao,Kuramoto, Kei,Kurosaka, Masahiro,Hata, Yutaka Korean Institute of Intelligent Systems 2010 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.10 No.1
For developing navigation system of total hip arthroplasty (THA) and evaluating hip joint kinematics, 3-D pose position of the femur and acetabulum in the pelvic coordinate system has been quantified. The pelvic coordinate system is determined by manually indicating pelvic landmarks in multidetector-row computed tomography (MDCT) images. It includes intra- and inter-observer variability, and may result in a variability of THA operation or diagnosis. To reduce the variability of pelvic coordinate system determination, this paper proposes an automated method in MDCT images. The proposed method determines pelvic coordinate system automatically by detecting pelvic landmarks on anterior pelvic plane (APP) from MDCT images. The method calibrates pelvic pose by using silhouette images to suppress the affect of pelvic pose change. As a result of comparing with manual determination, the proposed method determined the coordinate system with a mean displacement of $2.6\;{\pm}\;1.6$ mm and a mean angle error of $0.78\;{\pm}\;0.34$ deg on 5 THA subjects. For changes of pelvic pose position within 10 deg, standard deviation of displacement was 3.7 mm, and of pose was 1.28 deg. We confirmed the proposed method was robust for pelvic pose changes.
Fuzzy Logic in Trans-Skull Ultrasonic Imaging System
Yutaka Hata,Syoji Kobashi,Toshio Yanagida 한국지능시스템학회 2010 한국지능시스템학회 학술발표 논문집 Vol.20 No.2
This paper describes a fuzzy logic approach to image a brain surface and skull from arbitrary places. This paper first describes a trans-skull sonography system that can visualize the shape of the skull and brain surface from any point to examine skull fracture and some brain diseases. We employ fuzzy signal processing to determine the skull and brain surface. Two human subjects’ foreheads are applied in our system. The all shapes of the skin surface, skull surface, skull bottom, and brain tissue surface are successfully determined. Second, we consider a ultrasonic refraction of the skull to image brain sulcus. We do an experiment by using a cow scapula to imitate the skull bone and a biological phantom to imitate the cerebral sulcus. We calculate the refractive angle of ultrasonic wave and visualize the image considering the refraction of ultrasonic wave. In the result of applying our method, we can estimate the thickness of scapula at all points, and successfully visualize the phantom surface image.
최현광,황숙현,전민현,Syoji Yamada 한국전기전자재료학회 2011 Transactions on Electrical and Electronic Material Vol.12 No.4
The growth and characterization of In_(0.5)Ga_(0.5)As/In_(0.5)Al_(0.5)As narrow-gap inverted high electron mobility transistor structures, developed as a candidate material for spin-injection devices, are presented in this study. We have grown samples possessing surface In_(0.5)Ga_(0.5)As channels of different thicknesses (30 nm and 60 nm) both with and without a thin 3 nm In_(0.5)Al_(0.5)As cap layer by using molecular beam epitaxy. We then investigated the in-plane transport properties as well as the Rashba spin-orbit coupling constant of the two-dimensional electron gas confined at the heterojunction interface.
Minimization of Hydrodynamic Pressure Effect on the Ultraprecision Mirror Grinding
Lee, Sun-Kyu,Miyamoto, Yuji,Kuriyahawa, Tsunemoto,Syoji, Katsuo Korean Society for Precision Engineering 2005 International Journal of Precision Engineering and Vol.6 No.1
This paper describes an investigation about the fluid delivering method that minimizes the generation of hydrodynamic pressure and improves the grinding accuracy. Traditionally, grinding fluid is delivered for the purpose of cooling, chip flushing and lubrication. Hence, a number of conventional investigations are focused on the delivering method to maximize fluid flux into the contact arc between the grinding wheel and the work piece. It is already known that hydrodynamic pressure generates due to this fluid flux, and that it affects the overall grinding resistance and machining accuracy. Especially in the ultra-precision mirror grinding process that requires extremely small amount of cut per pass, its influence on the machining accuracy becomes more significant. Therefore, in this paper, a new delivering method of grinding fluid is proposed with focus on minimizing the hydrodynamic pressure effect. Experimental data indicates that the proposed method is effective not only to minimize the hydrodynamic pressure but also to improve the machining accuracy.
Minimization of Hydrodynamic Pressure Effect on the Ultraprecision Mirror Grinding
Sun-Kyu Lee,Yuji Miyamoto,Tsunemoto Kuriyagawa,Katsuo Syoji 한국정밀공학회 2005 International Journal of Precision Engineering and Vol.6 No.1
This paper describes an investigation about the fluid delivering method that minimizes the generation of hydrodynamic pressure and improves the grinding accuracy. Traditionally, grinding fluid is delivered for the purpose of cooling, chip flushing and lubrication. Hence, a number of conventional investigations are focused on the delivering method to maximize fluid flux into the contact arc between the grinding wheel and the work piece. It is already known that hydrodynamic pressure generates due to this fluid flux, and that it affects the overall grinding resistance and machining accuracy. Especially in the ultra-precision mirror grinding process that requires extremely small amount of cut per pass, its influence on the machining accuracy becomes more significant. Therefore, in this paper, a new delivering method of grinding fluid is proposed with focus on minimizing the hydrodynamic pressure effect. Experimental data indicates that the proposed method is effective not only to minimize the hydrodynamic pressure but also to improve the machining accuracy.