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>

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.

Structure and Regulation of New Lipoprotein Receptor

FUJIMOTO, Hiroki,ISHIKAWA, Kayako,TSUDA, Kanako,HAYASHI, Junko,KIM, Jeong-Seon,KANG, Man-Jong,KIM, Dong-Ho,SAEKI, Shigeru 충남대학교 형질전환복제돼지연구센터 2004 논문집 Vol. No.8

SOME EXAMPLES OF HYPERBOLIC HYPERSURFACES IN THE COMPLEX PROJECTIVE SPACE

Fujimoto, Hirotaka Korean Mathematical Society 2003 대한수학회지 Vol.40 No.4

In the previous paper [6], the author constructed hyperbolic hypersurfaces of degree $2^{n}$ in the n-dimensional complex projective space for every $n\;\geq\;3$. The purpose of this paper is to give some improvement of this result and to show some general methods of constructions of hyperbolic hypersurfaces of higher degree, which enable us to construct hyperbolic hypersurfaces of degree d in the n-dimensional complex projective space for every $d\;\geq\;2\;{\times}\;6^{n}$.

High-throughput Preparation and Characterization of Powder and Thin-film Library for Electrode Materials

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.

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.

Structure and Formation of Diesel Fuel Spray

Fujimoto, Hajime,Dan, Tomohisa The Institute for Liquid Atomization and Spray Sys 1996 한국액체미립화학회지 Vol.1 No.4

Research and development studies in internal combustion engines are set on a turning point due to requirements mostly purify the polluted environments. Naturally, basic studies concerned about engines are objected to elucidate formation mechanism of harmful matters, such as nitric oxide $(NO_x)$ and particulate matters. And for diesel engines, phenomenon in combustion chambers are analyzed in several approach ways in order to obtain detail understandings in closed and hardly observing space. In this article. it is discussed that the formation mechanism of diesel fuel sprays, mostly non-evaporating free diesel sprays. From that it would be promoted some new innovations in internal combustion engines of next generation.

Present Status and Perspectives of Cancer Chemotherapy to discover more potential antitumor agents

Fujimoto, Shuichi 한국균학회 1987 韓國菌學會誌 Vol.15 No.3

In order to discover potential new antitumor agents, we should understand the backgrounds for refractoriness of a majority of human tumors towards chemotherapy. Three kinds of mechanisms for resistance, i. e., temporary, kinetic and inherent resistances, are introduced in the present paper. Antitumor agents are classified into two groups with respect to modes for cytocidal action against tumor cells in vitro and in vivo. One is a cell-cycle-phase specific and the other is a cell-cycle-phase nonspecific(however, cycle specific). The former drugs show their cytocidal activity against tumor cells in a specific phase of the cell cycle. Antimetabolites and vinca alkaloids belong to this class. Thess drugs show logarithmic cytocidal action with increasing dose. After eradication of tumor cells in this specific phase, however, the remaining tumor cells in other phases are insensitive to these drugs, leading to the temporary resistance. Rapidiy growing tumors have a relatively high sensitivity to antitumor agents. Clinically detectable tumor size is approximately 1 ㎝ or more in diameter, and this tumor mass contains approximately 1 × 10^9 cells(1g) and tumor cells already carried out 30 times cell division. On the other hand, tumor mass at terminal stage reaches 1 × 10^(12) cells(1 ㎏) or more, and they carry out further 10 times cell division. The tumor growth rate we refer is those between the tumor mass of lg and 1 ㎏. Majority of human solid tumors have slow growth rate, leading to the kinetic resistance. Appearance of drug-resistant tumor cells is a serious obstacle to perform an effective chemotherapy, leading to the inherent resistance. It has been observed for a number of different tumor cells in culture that approximately 1 in 10^6(10^(-6)) cells of a given population is resistant to a given drug. Furthermore, most antitumor agents are variably mutagenic so that, during treatment, mutant daughter cells are produced that have a higher potential for being genetically drug-resistant. Several studies indicate that such chemical mutagens will increase the population of drug-resistant cells by a factor of 100. Therefore, treatment failure due to drug resistance may occur if the initial unexposed population of tumor cells is greater than 108 or if the number of daughter cells produced during treatment is greater than 10⁴. The clinical studies of new antitumor agents are carried out for those patients with tumors refractory to chemotherapy either initially or after treatment. Those tumor cells may show the pleiotropic cross resistance to new antitumor agents. Taking these problems into consideration, a new device should be developed for discovering new antitumor agents from natural products as well as from synthetic compounds.

Policy Implications for Cities in Music Industry of Japan

Fujimoto Noritsugu 대한지리학회 2011 대한지리학회 컨퍼런스 자료집 Vol.- No.6