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IMPROVEMENT OF AKARI NEP-DEEP 2-24 MICRON IMAGES/CATALOGUES WITH NEW CALIBRATIONS
Murata, Kazumi,Matsuhara, Hideo,Takagi, Toshinobu,Wada, Takehiko,Oyabu, Shinki,Oi, Nagisa The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We have created new catalogues of AKARI/IRC $2-24{\mu}m$ North Ecliptic Pole Deep survey through new methods of image analysis. In the new catalogues the number of false detection decreased by a factor of 10 and the number of objects detected in multiple bands increased by more than 1,500 compared to the previous work. In this proceedings the new methods of image analysis and the performance of the new catalogues are described.
MURATA YASUHIRO The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
The first Space-VLBI project, VSOP, started successfully with the launch of the dedicated space-VLBI satellite HALCA in 1997. The project has been in scientific operation in the 1.6 GHz and 5 GHz bands, and studies have been done mainly of the jet phenomena related to active galactic nuclei. A second generation space- VLBI project, VSOP-2, has been planned by the working group formed at ISAS/JAXA with many collaborators. The spacecraft is planned to observe in the 8, 22 and 43 GHz bands with cooled receivers for the two higher bands, and with a maximum angular resolution at 43 GHz (7 mm) of about 40 micro-arcseconds. The VSOP-2 satellite will also have the capability of the phase-reference and full polarization observations, which will produce more powerful results than those of the VSOP project. Far-future space-VLBI projects following VSOP and VSOP-2, have a large potential to achieve enough resolution and sensitivity to satisfy astronomers in future.
Murata, Keizo,Fukumoto, Yuhei,Yokogawa, Keiichi,Kang, Woun,Takaoka, Ryo,Tada, Ryota,Hirayama, H.,Brooks, James S.,Graf, David,Yoshino, Harukazu,Sasaki, Takahiko,Kato, Reizo Elsevier 2015 PHYSICA B-CONDENSED MATTER - Vol.460 No.-
<P><B>Abstract</B></P> <P>We have studied the angular dependence of magnetoresistance and Hall effect of the CDW organic conductor, HMTSF–TCNQ in order to see whether a magnetic-field-induced phase exists in the charge density wave (CDW) system, similarly to the magnetic-field-induced SDW phases in (TMTSF)<SUB>2</SUB>X. The anomaly in magnetoresistance was observed only around the pressure where the CDW is almost suppressed, i.e. around 0.8–1.1GPa, but neither at low pressures (0 and 0.5GPa) nor at high pressure above 2GPa. This behavior is quite similar to that of (TMTSF)<SUB>2</SUB>X. At 1.1GPa anomalies were found at fields of 0.2T and 10T. We speculate that at 1.1GPa the field-induced phase is located between 0.2T and 10T, where 1D Fermi surface sheet and 2D Fermi-surface pocket are present. The <I>R</I> <SUB> <I>xy</I> </SUB> shows plateau structure and <I>R</I> <SUB> <I>xx</I> </SUB> was very small in the same region, suggestive of quantum Hall effect.</P>
Repair of Iliac Crest Defects with a Hydroxyapatite/Collagen Composite
Murata Koichi,Fujibayashi Shunsuke,Otsuki Bungo,Shimizu Takayoshi,Matsuda Shuichi 대한척추외과학회 2020 Asian Spine Journal Vol.14 No.6
Study Design: Retrospective study.Purpose: This study aimed to assess the effect of refilling with hydroxyapatite/collagen (HAp/Col) composite on an iliac crest defect after spinal fusion.Overview of Literature: The use of iliac crest bone graft has been the gold standard in spinal fusion for a long time because of its biological and non-immunologic properties. Few reports have addressed how bone defects recover after iliac crest bone harvest following spinal fusion.Methods: Cancellous bone was collected from the anterior iliac crest during lateral interbody fusion (LIF), and the bone void of the ilium was refilled with a porous HAp/Col composite. We assessed bone recovery using computed tomography (CT). From the 74 patients who underwent LIF between January 2015 and December 2016, we included 49 patients whose iliac crest could be evaluated using CT at 3 months and 1 year after the surgery.Results: Bone defects decreased in a time-dependent manner after the surgery. Cortical closure was observed in 28.5% of the cases 3 months after the surgery; at 1 year postoperatively, 95.9% of the patients had cortical closure. Complete repair of the cancellous bone was achieved in 57.1% of the patients at 3 months after the surgery and in 95.9% at 1 year after the surgery. There were no significant hematomas, infections, iliac crest fractures, or soft tissue herniation.Conclusions: Radiographic recovery of cortical and cancellous bone defects was achieved with high probability via refilling with HAp/Col composite over the 1-year period.
Metal Ion Selectivity of Surface Templated Resins Carrying Phosphate Groups
Murata, Masaharu,Maeda, Mizuo,Takagi, Makoto 한국분석과학회 1995 분석과학 Vol.8 No.4
The metal ion selective resins were prepared by surface template polymerization using monooleyl phosphoric acid (1), oleyl methyl phosphoric acid (2) or oleyl ethyl phosphoric acid (3) as an amphiphilic host surfactant. The $Cu^{2+}$-imprinted resins prepared in the presence of $Cu^{2+}$ adsorbed $Cu^{2+}$ much more effectively than did their reference resins. On the other hand, the $Cu^{2+}$-imprinted resins showed much less binding ability to $Zn^{2+}$. The template-dependent selectivity should be ascribed to a favorable placement of the surface-anchored metallophilic groups for multidentate coordination to specific metal ion.
Murata, Toshiaki,Kawatsu, Utaro,Tamura, Junji,Tsuchiya, Takeshi Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.2
This paper presents a state space model of a two quadrant chopper and PWM inverter-fed Interior Permanent Magnet Synchronous Motor (IPMSM) drive system and its application to hybrid vehicles. The drive system has two different state equations for motoring and regenerating action. This paper presents a common state equation by using State Space Averaging method. Using this model of the IPMSM drive system, detailed simulation and controller design of the drive system, including PWM inverter switching, are given. The validity of this model and usefulness, according to a comparison among Maximum Torque/Ampere control, Maximum Torque/Flux control, and Maximum Efficiency optimization, are confirmed from simulation results.
Murata, Shingo,Yamashita, Yuichi,Arie, Hiroaki,Ogata, Tetsuya,Sugano, Shigeki,Tani, Jun IEEE 2017 IEEE transactions on neural networks and learning Vol.28 No.4
<P>We suggest that different behavior generation schemes, such as sensory reflex behavior and intentional proactive behavior, can be developed by a newly proposed dynamic neural network model, named stochastic multiple timescale recurrent neural network (S-MTRNN). The model learns to predict subsequent sensory inputs, generating both their means and their uncertainty levels in terms of variance (or inverse precision) by utilizing its multiple timescale property. This model was employed in robotics learning experiments in which one robot controlled by the S-MTRNN was required to interact with another robot under the condition of uncertainty about the other's behavior. The experimental results show that self-organized and sensory reflex behavior-based on probabilistic prediction-emerges when learning proceeds without a precise specification of initial conditions. In contrast, intentional proactive behavior with deterministic predictions emerges when precise initial conditions are available. The results also showed that, in situations where unanticipated behavior of the other robot was perceived, the behavioral context was revised adequately by adaptation of the internal neural dynamics to respond to sensory inputs during sensory reflex behavior generation. On the other hand, during intentional proactive behavior generation, an error regression scheme by which the internal neural activity was modified in the direction of minimizing prediction errors was needed for adequately revising the behavioral context. These results indicate that two different ways of treating uncertainty about perceptual events in learning, namely, probabilistic modeling and deterministic modeling, contribute to the development of different dynamic neuronal structures governing the two types of behavior generation schemes.</P>