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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.
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.
Numerical Prediction of Cavitating Flow inside Nozzle Hole Based on Cavitation Bubble Dynamics
( Matsumoto M. ),( Kobashi Y. ),( Matsumura E. ),( Senda J. ),( Fujimoto H. ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
In direct injection engines, fuel spray atomization is very important factor for the formation of fuel/air mixture, which influences on the engine performance and exhaust emissions of engine out. Especially, cavitation bubbles breaking out inside the nozzle hole have the significant role for spray atomization process. The purpose of this research is to make the effect of the cavitation on the fuel spray atomization clearly. The numerical model based on the bubble dynamics was proposed in this report, where the behavior of cavitation bubbles is treated as a function of pressure inside the nozzle hole. The prediction of bubble behavior under various conditions in the case of a single bubble was carried out by use of pressure distributions estimated through the experimental results. Primary, the processes of bubble growth and its shrinkage were calculated for each test fuel at given injection pressure. Secondary, the behavior of cavitation bubble was simulated for various initial bubble radiuses. As results of these calculations, although the position of bubble collapsing inside the nozzle hole does not coincide with experimental results, this proposed model predicts quantitatively the temporal change in bubble radius for each case.
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.
Kinetic Studies on a Novel Sulfotransferase from Eubacterium A-44, a Human Intestinal Bacterium
Kim, Dong-Hyun,Kobashi, Kyoichi 경희대학교 유전공학연구소 1991 遺傳工學論文集 Vol.3 No.-
A novel sulfotransferase purified from a human intestinal bacterium stoichiometrically catalyzed the transfer of a sulfate group of phenylsulfate esters to phenolic compounds. V_(max) values of the enzyme reaction were measured with various concentrations of a sulfate donor substrate, p-nitrophenylsulfate, and of a sulfate acceptor substrate, tyramine. Double reciprocal plots of the acceptor concentration and V_(max) showed a linear correlation. One of the reaction products, tyramine 0-sulfate, competitively inhibited the enzyme as to a donor substrate, p-nitrophenylsulfate (PNS), but the other reaction product, p-nitrophenol (PNP), noncompetitively inhibited it as to PNS. These kinetic data suggest that the sulfate transfer reaction proceeds according to a ping pong bi bi mechanism. The enzyme was activated by Mg^(2+) and inhibited by EDTA, which suggests that it is a metalloenzyme.
Yasuhiro Sadanaga,Tadashi Kobashi,Akie Yuba,Shungo Kato,Yoshizumi Kajii,Akinori Takami,Hiroshi Bandow 한국대기환경학회 2015 Asian Journal of Atmospheric Environment (AJAE) Vol.9 No.4
We conducted intensive observations of ozone, CO, NOx (=NO and NO2), NOy (total odd nitrogen species including particulate nitrate) and total nitrate (the sum of gaseous HNO3 and particulate nitrate) at Cape Hedo, Okinawa, Japan, from 19 March to 3 April, 2009, to investigate ozone production during long-range transport from the Asian continent. Ozone production efficiency (OPE) was used to evaluate photochemical ozone production. OPE is defined as the number of molecules of ozone produced photochemically during the lifetime of a NOx molecule. OPE is calculated by the ratio of the concentration increase of ozone to that of NOz (= NOy -NOx). Average OPE during observation was estimated to be 12.6±0.5, but concentrations of ozone increased nonlinearly with those of NOz. This non-linearity suggests that OPE depends on air mass origin and NOz concentrations. There were very different values of OPE for the same air mass origin, so that only the air mass origin alone does not control OPE. OPE was low when NOz concentration was high. We examined the correlation between NOz and CO/NOy ratios, which we used instead of the ratio of nonmethane hydrocarbons (NMHCs) to NOx. The CO/NOy ratios decreased with increasing NOz concentrations. These results indicate that competition reactions of OH with NMHCs and NO2 are the rate determining steps of photochemical ozone production during longrange transport from the Asian continent to Cape Hedo, for high concentrations of nitrogen oxides.