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Visible-wavelength spectroscopy of subkilometer-sized near-Earth asteroids with a low delta-v
Kuroda, D.,Ishiguro, M.,Takato, N.,Hasegawa, S.,Abe, M.,Tsuda, Y.,Sugita, S.,Usui, F.,Hattori, T.,Iwata, I.,Imanishi, M.,Terada, H.,Choi, Y.-J.,Watanabe, S.-i.,Yoshikawa, M. Astronomical Society of Japan 2014 Publications of the Astronomical Society of Japan Vol.66 No.3
Projective Feature Geometry: a Case Study in Korean Assimilation
S. Y. Kuroda 서울대학교 인지과학연구소 2004 Journal of Cognitive Science Vol.5 No.1
I propose a design for feature geometry. Degrees of sonority and voice quality are each represented by right branching trees that incorporate markedness conventions. I introduce the idea of projection reversal; this allows us to contextualize markedness conventions. With the proposed feature geometry, sonorant assimilation in Korean, which looks on the surface like very complicated data, is shown to be an optimal solution for adjusting sonority at the syllable boundary.
Kwon, Y. G.,Ishiguro, M.,Shinnaka, Y.,Nakaoka, T.,Kuroda, D.,Hanayama, H.,Takahashi, J.,Baar, S.,Saito, T.,Kawabata, M.,Uemura, M.,Morokuma, T.,Murata, K. L.,Takagi, S.,Morihana, K.,Nagayama, T.,Sekig Springer-Verlag 2018 Astronomy and astrophysics Vol.620 No.-
<P><I>Context.</I> Spectropolarimetry is a powerful technique for investigating the physical properties of gas and solid materials in cometary comae without mutual contamination, but only a few spectropolarimetric studies have been conducted to extract each component.</P><P><I>Aims.</I> We attempt to derive the continuum (i.e., scattered light from dust coma) polarization degree of comet 2P/Encke, free of the influence of molecular emissions. The target is unique in that its orbit is dynamically decoupled from Jupiter, like the main-belt asteroids, but it ejects gas and dust like ordinary comets.</P><P><I>Methods.</I> We observed the comet using the Hiroshima Optical and Near-Infrared Camera attached to the Cassegrain focus of the 150 cm Kanata telescope on UT 2017 February 21 when the comet was at the solar phase angle of <I>α</I> = 75°.7.</P><P><I>Results.</I> We find that the continuum polarization degree with respect to the scattering plane is <I>P</I>cont, r = 33.8 ± 2.7% at the effective wavelength of 0.82 <I>μ</I>m, which is significantly higher than those of cometary dust in a high-<I>P</I>max group at similar phase angles. Assuming that an ensemble polarimetric response of the dust of 2P/Encke as a function of phase angle is morphologically similar with those of other comets, its maximum polarization degree is estimated to <I>P</I>max ≳ 40% at <I>α</I>max ≈ 100°. In addition, we obtain the polarization degrees of the C2 swan bands (0.51-0.56 <I>μ</I>m), the NH2<I>α</I> bands (0.62-0.69 <I>μ</I>m), and the CN-red system (0.78-0.94 <I>μ</I>m) in a range of 3-19%, which depend on the molecular species and rotational quantum numbers of each branch. The polarization vector is aligned nearly perpendicularly to the scattering plane with an average of 0°.4 over a wavelength range of 0.50-0.97 <I>μ</I>m.</P><P><I>Conclusions.</I> From the observational evidence, we conjecture that the high polarization degree of 2P/Encke might be attributable to a dominance of large dust particles around the nucleus, which have remained after frequent perihelion passages near the Sun.</P>
Robot Manufacturing Class for Children Led by University Students
H. Ukida,Y. Aika,K. Achi,Y. Ishihara,J. Kuroda,G. Kosaki,S. Suzuki,Y. Nagata 한국공학교육학회 2010 공학교육연구 Vol.13 No.2
This paper introduces the Tokushima Robot Programming Club. This is a robot manufacturing class for elementary and junior-high school students. This club is planned and managed by university students. First, we show the organization of our club. And, robot kits and software development systems we use are introduced. And then, we describe the activities of this club and show its educational effectiveness for both the children and the university students.
An Evaluation of Concentrated and Distributed Windings in Interior PM and Claw Pole Motors
M. Inoue,Y.kuroda,S.Nishimura,H. Akita 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper describes a method to compare the relative merits of a concentrated and a distributed winding motor. Before the comparison, recent developments of coil manufacturing process for the both winding topologies are reviewed in order to assume appropriate copper fill factor in the comparison. A same frame size and a same rotor model are used in the comparison and only the coil winding topologies are different. The results show the advantages of distributed winding and concentrated winding change with not only motor core length but also output torque density. Another comparison between concentrated winding and distributed winding with a new type claw pole motor is also presented which is expected to be a rare-earth free motor topology.
Dislocation Density Simulations for Bulk Single Crystal Growth Process
Miyazaki, N .,Kuroda, Y . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.4
Computer simulations of the dislocation density during Czochralski (CZ) single crystal growth were performed for silicon crystals with 8-inch or 10-inch diameter using a finite element computer code developed by the authors. In the computer code, a dislocation kinetics model called the Haasen-Sumino model was used for the constitutive equation of a crystal at elevated temperatures. The computer code provides the dislocation density distributions and stress distributions during the CZ growth process. In the simulations. two values for the Young's modulus for the silicon single crystal were used in order to examine the effect of the Young's modulus on the dislocation density.
Growth of Seeded Escherichia coli in Rewetted Cattle Waste Compost of Different Stages
Hanajima, D.,Kuroda, K.,Fukumoto, Y.,Haga, K. Asian Australasian Association of Animal Productio 2004 Animal Bioscience Vol.17 No.2
Compost is used mainly as an organic fertilizer, but it is also used as bedding material for cattle. Dairy cattle have been identified as a main reservoir of pathogenic Escherichia coli O157:H7. Further, E. coli is regarded as an environmental pathogen that causes bovine clinical mastitis. Hence, its growth in compost spread or compost bedding should be avoided. Physical and chemical conditions, available nutrients and microflora in compost change greatly during the composting process. Since pathogen growth in compost seems to be related to these changes, we assessed the possibility of E. coli growth in compost samples collected at 0, 7, 13, 22, 41, 190 and 360 d. Cattle waste composts with and without added tofu residue were collected from static piles and immediately air-dried. Compost samples were inoculated with a pure culture of E. coli, the moisture content was adjusted to 50%, and the samples were incubated for 5 d at $30^{\circ}C$. The numbers of E. coli in compost before and after incubation were determined by direct plating on Chromocult coliform agar. Almost all compost samples supported E. coli growth. Samples collected during or immediately after the thermophilic phase (day 7) showed the highest growth. Growth in samples more than 13 d old were not significantly different from those of aged compost samples. The addition of tofu residue gave a higher growth than its absence in younger samples collected prior to 13 d. To minimize the risk of environmental mastitis, the use of compost in the initial stage of the process is better avoided.