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Optimal Macroprudential Policy for Korean Economy
Yuki Teranishi,Ko Munakata,Junichi Fujimoto 서울대학교 경제연구소 2015 Seoul journal of economics Vol.28 No.2
Fujimoto et al. (2014) set up a model with financial frictions through search and matching between firms and banks in the loan market. They also show that optimal policy criteria in the model include terms of credit variables. In this paper, we calibrate the model of Fujimoto et al. (2014) for South Korea and investigate the simple and optimal monetary and macroprudential policy rules that include credit variables in addition to the consumption gap and inflation rate as explanatory variables. We compare the performances of a standard Taylor rule and these optimal rules. Numerical simulations show that the simple macroprudential and monetary policy rules with credit terms can induce higher welfare than the estimated Taylor rule for the Korean economy. Simultaneously, simple macroprudential and monetary policy rules with credit terms do not always improve welfare.
Dynamical generation of fermion mass hierarchy in an extra dimension
Fujimoto, Yukihiro,Miura, Takashi,Nishiwaki, Kenji,Sakamoto, Makoto American Physical Society 2018 Physical Review D Vol.97 No.11
<P>We propose a new mechanism to produce a fermion mass hierarchy dynamically in a model with a single generation of fermions. A five-dimensional gauge theory on an interval with point interactions (zero-width brans) takes responsibility for realizing three generations and each massless zero mode localizes at boundaries of the segments on the extra dimension. An extra dimension coordinate-dependent vacuum expectation value of a scalar field makes large differences in overlap integrals of the localized zero modes and then an exponential fermion mass hierarchy can appear. The positions of the point interactions control the magnitude of the fermion mass hierarchy and are determined by the minimization condition of the Casimir energy. As a result of the minimization of the Casimir energy, an exponential mass hierarchy appears dynamically. We also discuss the stability of the extra dimension.</P>
Fujimoto Kenjiro,Onoda Kazuhiro,Ito Shigeru 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Powder library of pseudo four components Li-Ni-Co-Ti compounds were prepared for exploring the composition region with the single phase of the layer-type structure by using combinatorial high-throuput preparation system "M-ist Combi" based on electrostatic spray deposition method. The new layer-type compounds were found wider composition region than the previous report. This process is promising way to find multi component functional materials.
Basic Examination on 3D Measuring System Using Pulse-Compression
Fujimoto Ikumatsu,Ando Shigeru Korean Society for Precision Engineering 2005 International Journal of Precision Engineering and Vol.6 No.4
In this paper, we propose the basic measurement method of a 3D digitizer using a CCD camera in detail. In the localization measurement with a CCD camera, the effect of the background light and the sensitivity consideration are always problems in realizing a high precision. In this research, a new measurement principle is proposed in which the pulse compression technique known in radar is used to eliminate the effect of background light even under a low intensity light source, and the coordinate values on the CCD camera image plane are determined accurately. From the quantitative evaluation of the S/N ratio improvement and the fundamental experiment, it is verified that a substantial improvement in the S/N ratio is realized for both the background noise and the pixel noise and that a resolution of less than the pixel is sufficiently possible.
6d Dirac fermion on a rectangle; scrutinizing boundary conditions, mode functions and spectrum
Fujimoto, Y.,Hasegawa, K.,Nishiwaki, K.,Sakamoto, M.,Tatsumi, K. North Holland 2017 Nuclear physics, B Vol.922 No.-
We classify possible boundary conditions of a 6d Dirac fermion Ψ on a rectangle under the requirement that the 4d Lorentz structure is maintained, and derive the profiles and spectrum of the zero modes and nonzero KK modes under the two specific boundary conditions, (i) 4d-chirality positive components being zero at the boundaries and (ii) internal chirality positive components being zero at the boundaries. In the case of (i), twofold degenerated chiral zero modes appear which are localized towards specific directions of the rectangle pointed by an angle parameter θ. This leads to an implication for a new direction of pursuing the origin of three generations in the matter fields of the standard model, even though triple-degenerated zero modes are not realized in the six dimensions. When such 6d fermions couple with a 6d scalar with a vacuum expectation value, θ contributes to a mass matrix of zero-mode fermions consisting of Yukawa interactions. The emergence of the angle parameter θ originates from a rotational symmetry in the degenerated chiral zero modes on the rectangle extra dimensions since they do not feel the boundaries. In the case of (ii), this rotational symmetry is promoted to the two-dimensional conformal symmetry though no chiral massless zero mode appears. We also discuss the correspondence between our model on a rectangle and orbifold models in some details.
Comprehensive analysis of Yukawa hierarchies onT2/ZNwith magnetic fluxes
Fujimoto, Yukihiro,Kobayashi, Tatsuo,Nishiwaki, Kenji,Sakamoto, Makoto,Tatsuta, Yoshiyuki American Physical Society 2016 Physical Review D Vol.94 No.3
<P>Based on the results of the classification by T.-h. Abe et al., Nucl. Phys. B894, 374 (2015)., we exhaustively investigate Yukawa sector of U(8) model on magnetized orbifolds T-2 / Z(2), T-2 / Z(3), T-2 / Z(4) and T-2 / Z(6) by evaluating ratios of the mass eigenvalues of the three states in all the possible configurations with one and two Higgs pairs where three generations are realized in fermions. Because of the smearing effect via kinetic mixing, one can realize a hierarchy such as 10(-2)-10(-3), but it is very difficult to achieve the mass ratio between the up and top quarks (m(up) / m(top) similar to 10(-5)) on the complicated magnetized orbifolds T-2 / Z(N) (N similar to 3,4,6).</P>
Effect of Additive Elements on Electrochemical Behavior of Passive Films on Fe-18Cr Alloy
Fujimoto, S.,Umemura, H.,Kurihara, M.,Tsuchiya, H.,Shibata, T. 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.1
Electrochemical behaviour of Fe-18Cr-X (X: Al, Si, Ti, Mn, Ni, Cu, Zr, Nb, Mo, and W, 0.5-4 at.%) alloy thin films deposited on Si wafer by ion beam sputtering technique was examined in order to discuss the effect of alloying elements which are completely dissolved in the alloy. Polarisation curves measured in 0.1 krnol m" H2S04 revealed that active dissolution was suppressed by Ni, Nb, Mo, Cu and Ti, but was almost not affected by Al, Si, Mn. Pitting corrosion resistance in acid chloride solutions was extremely improved by Nb, Mo, Ti. On the other hand, Al, Si, Mn exhibited almost no change in pitting potential. Reactivation in sulphuric acid was suppressed by Mo, Nb, Ni, Ti, but not affected or slightly enhanced by Si and Mn. It is noticeable that addition of Nb is especially beneficial for preventing both pitting corrosion and reactivation. The corrosion behaviour of Fe-Cr alloys are discussed in terms of the stability of passive film which is influenced by minute additives incorporated in the film.