M Tanaka

National Institute for Fusion Science, Tokitsu-chō, Gifu, Japan

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Publications (721)1617.33 Total impact

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    Review of Modern Physics 12/2015; 87(4):2015-34. DOI:10.1103/RevModPhys.87.1311 · 29.60 Impact Factor
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    M.G. Aartsen · K. Abraham · M. Ackermann · J. Adams · J.A. Aguilar · M. Ahlers · M. Ahrens · D. Altmann · T. Anderson · I. Ansseau · [...] · T. Wong · R. Yamane · H. Yamaoka · K. Yamazaki · J. Yang · K. Yashiro · Y. Yoneda · H. Yoshii · R. Zollinger · Z. Zundel ·
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    ABSTRACT: We have conducted three searches for correlations between ultra-high energy cosmic rays detected by the Telescope Array and the Pierre Auger Observatory, and high-energy neutrino candidate events from IceCube. Two cross-correlation analyses with UHECRs are done: one with 39 cascades from the IceCube `high-energy starting events' sample and the other with 16 high-energy `track events'. The angular separation between the arrival directions of neutrinos and UHECRs is scanned over. The same events are also used in a separate search using a maximum likelihood approach, after the neutrino arrival directions are stacked. To estimate the significance we assume UHECR magnetic deflections to be inversely proportional to their energy, with values 3∘, 6∘ and 9∘ at 100 EeV to allow for the uncertainties on the magnetic field strength and UHECR charge. A similar analysis is performed on stacked UHECR arrival directions and the IceCube sample of through-going muon track events which were optimized for neutrino point-source searches.

  • Physical Review D 10/2015; 92(7). DOI:10.1103/PhysRevD.92.079901 · 4.64 Impact Factor
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    ABSTRACT: Using data collected with the Belle detector in the energy region of the $\Upsilon(10860)$ and $\Upsilon(11020)$ resonances we measure the $e^+e^- \to h_b(nP)\pi^+\pi^-$ $(n=1,2)$ cross sections. Their energy dependences show clear $\Upsilon(10860)$ and $\Upsilon(11020)$ peaks with a small or no non-resonant contribution. We study resonant structure of the $\Upsilon(11020) \to h_b(nP)\pi^+\pi^-$ transitions and find evidence that they proceed entirely via intermediate charged bottomonium-like states $Z_b(10610)$ and/or $Z_b(10650)$ (with current statistics we can not discriminate hypotheses of one or two intermediate states).
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    ABSTRACT: List of contributions from the CTA Consortium presented at the 34th International Cosmic Ray Conference, 30 July - 6 August 2015, The Hague, The Netherlands.
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    ABSTRACT: The Telescope Array experiment studies ultra high energy cosmic rays using a hybrid detector. Fluorescence telescopes measure the longitudinal development of the extensive air shower generated when a primary cosmic ray particle interacts with the atmosphere. Meanwhile, scintillator detectors measure the lateral distribution of secondary shower particles that hit the ground. The Middle Drum (MD) fluorescence telescope station consists of 14 telescopes from the High Resolution Fly's Eye (HiRes) experiment, providing a direct link back to the HiRes measurements. Using the scintillator detector data in conjunction with the telescope data improves the geometrical reconstruction of the showers significantly, and hence, provides a more accurate reconstruction of the energy of the primary particle. The Middle Drum hybrid spectrum is presented and compared to that measured by the Middle Drum station in monocular mode. Further, the hybrid data establishes a link between the Middle Drum data and the surface array. A comparison between the Middle Drum hybrid energy spectrum and scintillator Surface Detector (SD) spectrum is also shown.
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    ABSTRACT: We present an extraction of azimuthal correlations between two pairs of charged pions detected in opposite jets from electron-positron annihilation. These correlations may arise from the dependence of the di-pion fragmentation on the polarization of the parent quark in the process $e^+e^- \rightarrow q \bar{q}$. Due to the correlation of the quark polarizations, the cross-section of di-pion pair production, in which the pion pairs are detected in opposite jets in a dijet event, exhibits a modulation in the azimuthal angles of the planes containing the hadron pairs with respect to the production plane. The measurement of this modulation allows access to combinations of fragmentation functions that are sensitive to the quark's transverse polarization and helicity. Within our uncertainties we do not observe a significant signal from the previously unmeasured helicity dependent fragmentation function $G_1^\perp$. This measurement uses a dataset of 938~fb$^{-1}$ collected by the Belle experiment at or near $\sqrt{s}\approx10.58$ GeV.
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    ABSTRACT: In this work we are reporting on the measurement of the proton-air inelastic cross section $\sigma^{\rm inel}_{\rm p-air}$ using the Telescope Array (TA) detector. Based on the measurement of the $\sigma^{\rm inel}_{\rm p-air}$ the proton-proton cross section $\sigma_{\rm p-p}$ value is also determined at $\sqrt{s} = 95$ TeV. Detecting cosmic ray events at ultra high energies with Telescope Array enables us to study this fundamental parameter that we are otherwise unable to access with particle accelerators. The data used in this report is collected over five years using hybrid events observed by the Middle Drum fluorescence detector together with the surface array detector. The value of the $\sigma^{\rm inel}_{\rm p-air}$ is found to be equal to $ 567.0 \pm 70.5 [{\rm Stat.}] ^{+25}_{-29} [{\rm Sys.}]$ mb. The total proton-proton cross section is subsequently inferred from Glauber Formalism and Block, Halzen and Stanev QCD inspired fit and is found to be equal to $170_{-44}^{+48} [{\rm Stat.}] \pm _{-19}^{+17} [{\rm Sys.}] $mb.
    Physical Review D 05/2015; 92(3). DOI:10.1103/PhysRevD.92.032007 · 4.64 Impact Factor
  • N Akata · H Kakiuchi · T Tamari · M Tanaka · T Kawano · H Miyake · T Uda · K Nishimura ·
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    ABSTRACT: Free water tritium (FWT) and organically bound tritium (OBT) concentrations in pine needles have been investigated to understand the regional background tritium concentration in Toki City. Samples were regularly collected from pine trees on the National Institute for Fusion Science campus (1998-2012) and the nearby Shiomi Park (SP; 2002-12). FWT and OBT concentrations of the former samples ranged from 0.33 to 0.92 and 0.41 to 1.10 Bq l(-1), respectively, while those of the latter samples ranged from 0.32 to 0.86 and 0.33 to 0.79 Bq l(-1), respectively. Results of both sampling sites were almost the same, and they have been gradually decreased year by year. Concentration level of tritium for Toki City was close to the average background level in Japan. The OBT/FWT ratios were almost 1.0. The apparent half-life of FWT in this period was estimated as almost 10 y, and that of OBT was estimated as almost 12 y; these values were almost the same as the physical half-life. © The Author 2015. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.
    Radiation Protection Dosimetry 05/2015; 167(1-3). DOI:10.1093/rpd/ncv246 · 0.91 Impact Factor
  • M Tanaka · T Uda ·
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    ABSTRACT: Atmospheric tritium concentrations of HTO, HT and CH3T have been measured at Toki, Japan, for the environmental impact assessment of tritium for a fusion test facility. According to the data from 2004 to 2012, the concentrations of HT and HTO in water vapour tend to increase in spring. The seasonal variation in HT concentration at Toki was compared with the H2 concentration between 1990 and 2005 at Tae-ahn Peninsula, Republic of Korea, which is at approximately the same latitude as Toki. The monthly average of HT-specific activity varied from 1.24 × 10(5) to 1.76 × 10(5) TU. The peak of the monthly average H2 concentration did not match that of HT. This indicates that the mechanism of the production or the source of HT might be different from the production mechanism of H2. © The Author 2015. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.
    Radiation Protection Dosimetry 05/2015; 167(1-3). DOI:10.1093/rpd/ncv241 · 0.91 Impact Factor
  • R. Nakane · S. Sugahara · M. Tanaka ·
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    ABSTRACT: We systematically investigate the structural and magnetic properties of ferromagnetic Fe1− x Si x (0.18 ≤ x ≤ 0.33) films formed by rapid thermal annealing (RTA) on silicon-on-insulator (SOI) substrates. During RTA of an Fe film deposited on a SOI substrate (consisting of a top Si layer, a buried oxide SiO2 layer, and a Si substrate), an Fe1− x Si x film is synthesized by the thermal reaction of the deposited Fe film and the top Si layer, but the reaction is limited by the buried oxide layer in the SOI substrate, thus the Si concentration x in Fe1− x Si x can be controlled by both the initial thicknesses of the Fe film and the top Si layer. A variety of characteristics show that single-phase Fe1− x Si x (x = 0.18, 0.22, and 0.25) films with D03 + B2 structure are successfully obtained by choosing the optimum annealing temperature and time. Furthermore, the ordering fraction of D03 and B2 structures in these films is found to be more than 87%, indicating that the crystalline quality of these films is comparable to that of bulk Fe1− x Si x materials reported so far. On the other hand, it is found that the Fe1− x Si x (x = 0.33) film has Fe3Si and FeSi phases as in the case of bulk Fe1− x Si x with x = 0.33. The film production technique and the quality of the ferromagnetic Fe1− x Si x presented in this study are very attractive and useful for silicon-based spintronic devices which are compatible with the complementary metal-oxide-semiconductor technology.
    Journal of Applied Physics 04/2015; 117(13):133906. DOI:10.1063/1.4915335 · 2.18 Impact Factor
  • K Kaku · H Kitada · H Noguchi · K Kurihara · S Kawanami · U Nakamura · M Tanaka ·
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    ABSTRACT: Simultaneous pancreas-kidney transplantation (SPK) is a definitive treatment for type 1 diabetics with end-stage renal disease (ESRD). Because of the shortage of deceased donors in Japan, the mortality rate during the waiting period is high. We evaluated mortality risk in patients with type 1 diabetes waiting for SPK, and the benefit of living-donor kidney transplantation (LDK) preceding pancreas transplantation, which may reduce mortality in patients awaiting SPK. This retrospective study included 71 patients with type 1 diabetes. Twenty-six patients underwent SPK, 15 underwent LDK, and 30 were waiting for SPK. Their cumulative patient and graft survival rates were retrospectively evaluated. Risk factors contributing to mortality in patients with type 1 diabetes awaiting SPK were evaluated with the use of a Cox proportional hazards model. The 5-year cumulative patient survival rates in the SPK and LDK groups were 100% and 93.3%, respectively (P = .19), and 5-year kidney graft survival rates were 95.7% and 100% (P = .46), respectively. The cumulative survival rate in patients awaiting SPK was 77.7% at 5 years after registration. Duration of dialysis was the only factor significantly associated with patient and graft survivals according to both univariate and multivariate analyses. Patient and graft survival rates were similar in the SPK and LDK groups, but the survival rate of patients awaiting SPK decreased over time. Duration of dialysis was an independent risk factor for patient and graft survival. LDK preceding pancreas transplantation may be an effective therapeutic option for patients with type 1 diabetes and ESRD. Copyright © 2015 Elsevier Inc. All rights reserved.
    Transplantation Proceedings 04/2015; 47(3):733-7. DOI:10.1016/j.transproceed.2014.12.048 · 0.98 Impact Factor
  • A. Nakamura · K. Munakata · K. Hara · S. Narita · T. Sugiyama · K. Kotoh · M. Tanaka · T. Uda ·
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    ABSTRACT: It is necessary to recover or process tritiated species that are extensively coexistent in nuclear fusion installations. A conventional way to recover tritium release to atmosphere is catalytic oxidation of tritiated species and adsorption of tritated water vapor on adsorbents with high surface areas. However, pressure loss would become more serious with increase in the size of adsorbent beds, which could lead to greater power needs for ventilation systems. Therefore, new adsorbents with low pressure loss and high surface areas need to be developed and utilized for such large-scale adsorption systems. Thus, the authors tested new types of adsorbents, which are gear-type and honeycomb-type pellet adsorbents. The experimental results reveal that the gear-type pellet adsorbents have larger adsorption capacity than the honeycomb-type pellet adsorbent. It was also found that the gear-type MS4A adsorbent possesses larger adsorption capacity than other adsorbents tested in this work. Furthermore, it was found that new types of adsorbents are lower pressure than conventional-type of adsorbents. Among the new adsorbents studied in this work, the gear-type MS4A adsorbent appears to be most promising for the application to the adsorption systems in terms of adsorption capacity and adsorption rate.
    Fusion Science and Technology 04/2015; 67(3):499-502. DOI:10.13182/FST14-T64 · 0.49 Impact Factor
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    ABSTRACT: Renal transplantation has been established as a treatment for end-stage renal disease (ESRD) due to diabetic nephropathy. However, few studies have focused on the outcome after renal transplantation in patients with ESRD and type 2 diabetic nephropathy. To investigate the effect of renal transplantation on ESRD with type 2 diabetic nephropathy, we retrospectively analyzed patients who received renal transplantation at our facility. This study aimed to compare the outcome of renal transplantation for type 2 diabetic nephropathy with that for nondiabetic nephropathy. We studied 290 adult patients, including 65 with type 2 diabetic nephropathy (DM group) and 225 with nondiabetic nephropathy (NDM group), who underwent living-donor renal transplantation at our facility from February 2008 to March 2013. We compared the 2 groups retrospectively. In the DM and NDM groups, the 5-year patient survival rates were 96.6% and 98.7%, and the 5-year graft survival rates were 96.8% and 98.0%, respectively, with no significant differences between the groups. There were no significant differences in the rates of surgical complications, rejection, and infection. The cumulative incidence of postoperative cardiovascular events was higher in the DM group than in the NDM group (8.5% vs 0.49% at 5 years; P = .002). Patient and graft survival rates after renal transplantation for type 2 diabetic nephropathy are not inferior to those for recipients without diabetic nephropathy. Considering the poor prognosis of patients with diabetic nephropathy on dialysis, renal transplantation can provide significant benefits for these patients. Copyright © 2015 Elsevier Inc. All rights reserved.
    Transplantation Proceedings 03/2015; 47(3). DOI:10.1016/j.transproceed.2014.12.047 · 0.98 Impact Factor
  • T. Kawano · S. Isozumi · Y. Isozumi · M. Tosaki · M. Tanaka · T. Sugiyama ·
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    ABSTRACT: Air exerts a negative effect on radiation detection using a gas counter because oxygen contained in air has a high electron attachment coefficient and can trap electrons from electron-ion pairs created by ionization from incident radiation in counting gas. This reduces radiation counts. The present study examined the influence of air on energy and rise-time spectra measurements using a proportional gas counter. In addition, a decompression procedure method was proposed to reduce the influence of air and its effectiveness was investigated. For the decompression procedure, the counting gas inside the gas counter was decompressed below atmospheric pressure before radiation detection. For the spectrum measurement, methane as well as various methane and air mixtures were used as the counting gas to determine the effect of air on energy and rise-time spectra. Results showed that the decompression procedure was effective for reducing or eliminating the influence of air on spectra measurement using a proportional gas counter.
    Fusion Science and Technology 03/2015; 67(2):408-411. DOI:10.13182/FST14-T40 · 0.49 Impact Factor
  • T Ueki · K Nagayoshi · T Manabe · R Maeyama · A Yokomizo · H Yamamoto · Y Oda · M Tanaka ·
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    ABSTRACT: We herein present a novel technique for laparoscopic en bloc excision involving anteriorly extended intersphincteric resection with partial resection of the posterior lobe of the prostate for large rectal gastrointestinal stromal tumors (GISTs). The sequence of neoadjuvant imatinib therapy and this less invasive surgery for marginally resectable rectal GISTs has the potential to obviate the need for urinary reconstruction and permanent stomas without jeopardizing the tumor margin status.
    Techniques in Coloproctology 12/2014; 19(4). DOI:10.1007/s10151-014-1261-6 · 2.04 Impact Factor
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    ABSTRACT: This review presents the recent progress in computational materials design, experimental realization, and control methods of spinodal nanodecomposition under three- and two-dimensional crystal-growth conditions in spintronic materials, such as magnetically doped semiconductors. The computational description of nanodecomposition, performed by combining first-principles calculations with kinetic Monte Carlo simulations, is discussed together with extensive electron microscopy, synchrotron radiation, scanning probe, and ion beam methods that have been employed to visualize binodal and spinodal nanodecomposition (chemical phase separation) as well as nanoprecipitation (crystallographic phase separation) in a range of semiconductor compounds with a concentration of transition metal (TM) impurities beyond the solubility limit. The role of growth conditions, co-doping by shallow impurities, kinetic barriers, and surface reactions in controlling the aggregation of magnetic cations is highlighted. According to theoretical simulations and experimental results the TM-rich regions appear either in the form of nanodots (the {\em dairiseki} phase) or nanocolumns (the {\em konbu} phase) buried in the host semiconductor. Particular attention is paid to Mn-doped group III arsenides and antimonides, TM-doped group III nitrides, Mn- and Fe-doped Ge, and Cr-doped group II chalcogenides, in which ferromagnetic features persisting up to above room temperature correlate with the presence of nanodecomposition and account for the application-relevant magneto-optical and magnetotransport properties of these compounds. Finally, it is pointed out that spinodal nanodecomposition can be viewed as a new class of bottom-up approach to nanofabrication.
  • Y. Ishida · T. Togashi · K. Yamamoto · M. Tanaka · T. Kiss · T. Otsu · Y. Kobayashi · S. Shin ·
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    ABSTRACT: The paper describes a time- and angle-resolved photoemission apparatus consisting of a hemispherical analyzer and a pulsed laser source. We demonstrate 1.48-eV pump and 5.92-eV probe measurements at the 10.5-meV and 240-fs resolutions by use of fairly monochromatic 170-fs pulses delivered from a regeneratively amplified Ti:sapphire laser system operating typically at 250 kHz. The apparatus is capable to resolve the optically filled superconducting peak in the unoccupied states of a cuprate superconductor, Bi2Sr2CaCu2O8 + δ. A dataset recorded on Bi(111) surface is also presented. Technical descriptions include the followings: A simple procedure to fine-tune the spatio-temporal overlap of the pump-and-probe beams and their diameters; achieving a long-term stability of the system that enables a normalization-free dataset acquisition; changing the repetition rate by utilizing acoustic optical modulator and frequency-division circuit.
    Review of Scientific Instruments 11/2014; 85(12). DOI:10.1063/1.4903788 · 1.61 Impact Factor
  • K. Shinkai · K. Nakano · H. Onishi · M. Tanaka · M. Katano ·

    39th ESMO Congress (ESMO); 09/2014
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    ABSTRACT: We demonstrate monolithic integration of pseudo-spin-MOSFETs (PS-MOSFETs) using vendor-made MOSFETs fabricated in a low-cost multi-project wafer (MPW) product and lab-made magnetic tunnel junctions (MTJs) formed on the topmost passivation film of the MPW chip. The tunneling magnetoresistance (TMR) ratio of the fabricated MTJs strongly depends on the surface roughness of the passivation film. Nevertheless, after the chip surface was atomically flattened by SiO2 deposition on it and successive chemical–mechanical polish (CMP) process for the surface, the fabricated MTJs on the chip exhibits a sufficiently large TMR ratio (>140%) adaptable to the PS-MOSFET application. The implemented PS-MOSFETs show clear modulation of the output current controlled by the magnetization configuration of the MTJs, and a maximum magnetocurrent ratio of 90% is achieved. These magnetocurrent behaviour is quantitatively consistent with those predicted by HSPICE simulations. The developed integration technique using a MPW CMOS chip would also be applied to monolithic integration of CMOS devices/circuits and other various functional devices/materials, which would open the door for exploring CMOS-based new functional hybrid circuits.
    Solid-State Electronics 07/2014; 102. DOI:10.1016/j.sse.2014.06.004 · 1.50 Impact Factor

Publication Stats

12k Citations
1,617.33 Total Impact Points


  • 1996-2015
    • National Institute for Fusion Science
      • Department of Helical Plasma Research
      Tokitsu-chō, Gifu, Japan
    • Fukuoka University
      • Department of Gastroenterology
      Hukuoka, Fukuoka, Japan
  • 1973-2015
    • Kyushu University
      • • Department of Surgery and Oncology
      • • Division of Surgery
      • • Graduate School of Medical Sciences
      • • Medical Hospital
      • • Department of Urology
      Hukuoka, Fukuoka, Japan
  • 2010-2013
    • National Institutes Of Natural Sciences
      Edo, Tōkyō, Japan
  • 2006-2013
    • Japan Atomic Energy Agency
      • • Quantum Beam Science Directorate
      • • Advanced Photon Research Center
      Muramatsu, Niigata, Japan
    • Japan Synchrotron Radiation Research Institute (JASRI)
      Tatsuno, Hyōgo, Japan
  • 2005-2013
    • Osaka City University
      Ōsaka, Ōsaka, Japan
    • Waseda University
      • Graduate School of Science and Engineering
      Edo, Tōkyō, Japan
  • 1986-2013
    • The University of Tokyo
      • • Institute for Solid State Physics
      • • Department of Electrical and Electronics Engineering
      • • Faculty & Graduate School of Medicine
      • • Institute of Industrial Science
      Tōkyō, Japan
  • 1999-2012
    • Tokai University
      • School of Medicine
      Hiratuka, Kanagawa, Japan
    • Nagoya University
      • Graduate School of Engineering
      Nagoya, Aichi, Japan
  • 2001-2010
    • Kobe Tokiwa University
      Kōbe, Hyōgo, Japan
  • 2009
    • Tohoku University
      • Institute of Multidisciplinary Research for Advanced Materials (IMRAM)
      Sendai, Kagoshima, Japan
  • 1994-2009
    • Nara Medical University
      • Department of Urology
      Kashihara, Nara, Japan
    • The University of Tokushima
      Tokusima, Tokushima, Japan
    • Dallas Zoo
      Dallas, Texas, United States
  • 2007-2008
    • Kobe College
      Kōbe, Hyōgo, Japan
    • High Energy Accelerator Research Organization
      Tsukuba, Ibaraki, Japan
    • Center of Molecular Immunology
      La Habana, La Habana, Cuba
  • 2005-2008
    • National Institute of Advanced Industrial Science and Technology
      • Electronics and Photonics Research Institute
      Tsukuba, Ibaraki, Japan
    • Hitachi, Ltd.
      Edo, Tōkyō, Japan
  • 1998-2003
    • Osaka University
      • • Institute of Laser Engineering
      • • Research Center for Nuclear Physics
      Ibaraki, Osaka-fu, Japan
    • St. Luke's International Hospital
      Edo, Tōkyō, Japan
  • 2002
    • Yokohama National University
      • Department of Mechanical Engineering and Material Science
      Yokohama, Kanagawa, Japan
  • 1993-2001
    • Tokyo Medical and Dental University
      • • Department of Pulmonary Medicine
      • • Department of Biochemical Genetics
      • • Department of Internal Medicine
      Edo, Tokyo, Japan
    • imec Belgium
      Louvain, Flemish, Belgium
  • 2000
    • University of Lausanne
      • Institute of Pathology
      Lausanne, Vaud, Switzerland
  • 1992-1999
    • National Institute for Basic Biology
      Okazaki, Aichi, Japan
    • Yamaguchi University
      Yamaguti, Yamaguchi, Japan
  • 1995
    • National Cancer Institute (USA)
      베서스다, Maryland, United States
  • 1983-1995
    • Niigata University
      • Division of Neuropathology
      Niahi-niigata, Niigata, Japan
  • 1990-1992
    • Shinshu University
      Shonai, Nagano, Japan
    • Hirosaki University
      • School of Medicine
      Khirosaki, Aomori, Japan
  • 1991
    • Tokyo Metropolitan Hiroo Hospital
      • Department of Pathology
      Edo, Tōkyō, Japan