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Kurita, Takeshi,Mizuhashi, Fumi,Sato, Toshihide,Koide, Kaoru The Korean Academy of Prosthodonitics 2020 The Journal of Advanced Prosthodontics Vol.12 No.6
PURPOSE. The present study aimed to investigate the relationships between the crown form of the upper central incisor and their labial inclination, overbite, and overjet. MATERIALS AND METHODS. Maxillary and mandibular casts of 169 healthy dentitions were subjected to 3D dental scanning, and analyzed using CAD software. The crown forms were divided into tapered, square, and ovoid based on the mesiodistal dimensions at 20% of the crown height to that at 40%. The degree of labial inclination of the upper central incisor was defined as the angle between the occlusal plane and the line connecting the incisal edge and tooth cervix. The incisal edges of the right upper and lower central incisor that in contact with lines parallel to the occlusal plane were used to determine the overbite and overjet. One-way ANOVA was performed to compare the labial inclination, overbite, and overjet among the crown forms. RESULTS. The crown forms were classified into three types; crown forms with a 20%/40% dimension ratio of 1.00±0.01 were defined as square, >1.01 as tapered, and <0.99 as ovoid. The labial inclination degree was the greatest in tapered and the least in square. Both overbite and overjet in tapered and ovoid were higher than those in square. CONCLUSION. Upper central incisor crown forms were related to their labial inclination, overbite, and overjet. It was suggested that the labial inclination, overbite, and overjet should be taken into consideration for the prosthetic treatment or restoring the front teeth crowns.
Kurita, Tetsushi,Matsui, Kunihito Techno-Press 2002 Structural Engineering and Mechanics, An Int'l Jou Vol.13 No.2
This paper presents a computational method for a confidence region of identified parameters which are affected by measurement noise and error contained in prescribed parameters. The method is based on sensitivities of the identified parameters with respect to model parameter error and measurement noise along with the law of error propagation. By conducting numerical experiments on simple models, it is confirmed that the confidence region coincides well with the results of numerical experiments. Furthermore, the optimum arrangement of sensor locations is evaluated when uncertainty exists in prescribed parameters, based on the concept that square sum of coefficients of variations of identified results attains minimum. Good agreement of the theoretical results with those of numerical simulation confirmed validity of the theory.
Kurita Eiji 언어과학회 2015 언어과학연구 Vol.0 No.72
Identifying the correct sounds of Chinese characters in the Old Korean language is not easy because of the shortage of historical documents. The purpose of this paper is to develop a new method to solve this problem through the use of Japanese history books. One of the oldest Japanese history books, Nihonshoki (A.D. 720), was written only in Chinese characters because there was no written Japanese language at that time. Recently, Mori Hiromichi discovered that some parts of this book were written by two specific Chinese individuals. In Nihonshoki, these individuals recorded many Japanese poems (Waka) by using the sounds of Chinese characters at that time. Using this process, the Chinese scribes used multiple documents written by some of the many Korean-Japanese secretaries who had been working in Japan. I believe that some of these Korean-Japanese must have assisted the Chinese writers by reading Waka aloud to them because the Chinese may not have been well trained in Japanese. As a result, some features of the sounds of Chinese characters, as pronounced in Old Koran, were recorded in this book. In this paper, I have presented some phonetical evidence of this. It is my belief that this is anew method to approach the sounds of the Old Korean language.
Investigation of Ferroelectric Transition in SrTi18O3 under Hydrostatic Pressure
Masaaki Kurita,Alain Moreac,Jean-Claude Ameline,Masaki Takesada,Mitsuru Itoh,Shinya Koshihara,Tadahiko Ishikawa 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
SrTi18O3 shows a ferroelectric transition at 19.7 K at ambient pressure, and the appearance of new Raman peaks associated with this ferroelectric transition has been reported. This is the rst report of the observation of the change in the Raman spectra under high pressure. The ferroelectric-transition temperature probed by dielectric-property measurements decreases with increasing pressure (P), and the ferroelectric order seems to disappear for the P > 500 bar. Quite parallel behavior has been conrmed for the P dependence of the intensity of the Raman band characteristic of the ferroelectric state.
Analysis of Radial Air-shear Force on Magnetic Disks for Reducing the Spin-off of Lubricants
M. KURITA,H. SHIMIZU,M. MIZUMOTO,Y. OOTANI 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
To reduce the spin-off of lubricants on a magnetic disk, which is caused by the radial component of shear force between the disk and air, we analyzed the air-velocity distribution and the air-shear force by three-dimensional large-eddy simulation (LES). This sensitivity analysis, on five design parameters, showed that disk/arm clearance and ann thickness have a greater effect on the mean radial air-shear force than the other parameters. The force on a disk optimized according to the optimum parameters is 12% less than the force on a conventional disk.
S. Kurita,K. Imai,T.Yokoyama,S.Ohasi 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In recent years, the switching frequency of power converter is increased due to the progress of the power devices. As the result, passive elements used in power converters can be reduced in the volume. The inductors using dust core material is applied to the PWM inverter to downsize the filter component. In the case of using the dust core inductors, the flux density is saturated for the large inductance current and the inductance parameter is rapidly varied widely due to the inductance current variations. The output characteristics is deteriorated in the case of the conventional control. Two kinds of the deadbeat control methods combined with the disturbance compensation and the inductance estimation with 1MHz multisampling method were proposed to adjust the control gains for the inductance parameter variations. In this paper, the effect of the two kinds methods were verified through simulations and experiments.