H. Ogawa

Nara Women's University, Nara, Nara, Japan

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Publications (629)1769.22 Total impact

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    ABSTRACT: A search for dark matter was conducted with the XMASS detector by means of the expected annual modulation due to the Earth's rotation around the Sun. The data used for this analysis was 359.2 live days $\times$ 832 kg of exposure accumulated between November 2013 and March 2015. The result of a simple modulation analysis, without assuming any specific dark matter model, showed a slight negative amplitude. As the $p$-values are 6.1 or 17\% in our two independent analyses, these results are consistent with fluctuations. We also set 90\% confidence level (C.L.) upper bounds that can be used to test models. When we assume Weakly Interacting Massive Particle (WIMP) dark matter elastically scattering on the target nuclei, we exclude almost all the DAMA/LIBRA allowed region with the modulation analysis. This is the first extensive search probing this region with redan exposure comparable to theirs.
    Preview · Article · Nov 2015
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    ABSTRACT: Double electron capture is a rare nuclear decay process in which two orbital electrons are captured simultaneously in the same nucleus. Measurement of its two-neutrino mode would provide a new reference for the calculation of nuclear matrix elements whereas observation of its neutrinoless mode would demonstrate lepton number violation. A search for two-neutrino double electron capture on $^{124}$Xe is performed using 165.9 days of data collected with the XMASS-I detector. No significant excess above background was observed and we set a lower limit on the half-life as $4.7 \times 10^{21}$ years at 90% confidence level.
    Full-text · Article · Oct 2015
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    ABSTRACT: To examine if a simple biomarker can identify people with diabetes who are at high risk of atrial fibrillation. A retrospective cohort study was conducted at a single centre in people with Type 2 diabetes referred to our department between January 2000 and December 2007. In 517 consecutive people without any history, signs or symptoms of atrial fibrillation at baseline, the association between baseline B-type natriuretic peptide level and future atrial fibrillation incidence was examined, with adjustments for other potentially confounding factors. A total of 28 people were diagnosed with new-onset atrial fibrillation during a median 6-year follow-up. When people were categorized into three groups according to B-type natriuretic peptide clinical thresholds (20 and 100 pg/ml), hazard ratios for the development of atrial fibrillation in the middle and highest B-type natriuretic peptide groups were 2.8 and 9.4, respectively, compared with the lowest B-type natriuretic peptide group. Time-dependent receiver-operating curve analysis identified a threshold for B-type natriuretic peptide to detect atrial fibrillation development of 52.8 pg/ml (sensitivity 75.2%, specificity 68.8%). The B-type natriuretic peptide predictive value was independent of and similar to that of left atrial size and ventricular dimension. In people with Type 2 diabetes, high baseline B-type natriuretic peptide levels were significantly associated with future atrial fibrillation development. This article is protected by copyright. All rights reserved. This article is protected by copyright. All rights reserved.
    Full-text · Article · Jul 2015 · Diabetic Medicine
  • H. Ogawa · S. Amano · K. Ishii · T. Kaneko
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    ABSTRACT: The statistical distributions of the number of forward- and backward-emitted secondary electrons (SE’s) from a thin carbon foil have been measured simultaneously in coincidence with foil-transmitted 1H+, 4He2+ and 6Li3+ at a fixed velocity of 1 MeV/u. The emergence angles of the projectiles, , were varied from 0 to 2 [mrad] for H+ and from 0 to 1 [mrad] for He2+ and Li3+ ions. Irrespective of ion species, measured total SE yields, that is, the average number of simultaneous emitted electrons per projectile, increase with increasing both in the forward and backward directions. This trend is consistent with the calculated -dependent energy losses of protons penetrating a thin carbon foil. As for the forward- or backward-emitted SE yields, we have obtained a negative forward–backward(F–B) correlation, except for the [mrad] emergence of H+ projectiles where a positive correlation has been observed. The negative F–B correlation becomes prominent with increasing the atomic number of the projectile, . In addition, this correlation appears to become slightly stronger with increasing . The observed F–B correlation and its - and -dependences are interpreted from the point of view of production of high energy internal SE’s.
    No preview · Article · Jul 2015 · Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms
  • Y. Hirano · M. Umigishi · K. Ishii · H. Ogawa
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    ABSTRACT: To extract an ion beam into air, the technique using a single macro-capillary has been paid attention. We have expanded the bore of the metal capillary up to 500 μm∅ inlet diameter to increase the beam intensity and have measured the intensity distributions of the extracted 3 MeV proton beam. Furthermore, we have tilted the capillary angle and measured the intensity distributions of the ion beam. In this article, we will present the experimental results together with the simulation which takes the tilt angles of the capillary into account.
    No preview · Article · Jul 2015 · Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms
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    ABSTRACT: Diabetes mellitus (DM) is a factor in the hematopoietic cell transplantation-comorbidity index. However, the impact of pre-transplant DM on morbidity and cause-specific non-relapse mortality (NRM) remains unclear. We performed a retrospective study with registry data that included a total of 7626 patients who underwent their first allogeneic hematopoietic SCT (HSCT) between 2007 and 2010. The median age was 44 years (range 0-88). Compared with patients without pre-transplant DM (non-DM group, n=7248), patients with pre-transplant DM (DM group, n=378) were older and were more likely to have high-risk disease, a reduced-intensity conditioning regimen and GVHD prophylaxis using tacrolimus. Multivariate analyses showed that pre-transplant DM was associated with increased risks of NRM (hazard ratio (HR)1.46, 95% confidence interval (CI) 1.21-1.76, P<0.01) and infection-related NRM (HR 2.08, 95% CI 1.58-2.73, P<0.01). The presence of pre-transplant DM was associated with an increased risk of overall mortality in a multivariate analysis (HR 1.55, 95% CI 1.35-1.78, P<0.01). In conclusion, pre-transplant DM was a risk factor for NRM, particularly infection-related mortality, after allogeneic HSCT. To improve the clinical outcome in patients with DM, the benefits of strict infection control and appropriate glycemic control should be explored in future trials.Bone Marrow Transplantation advance online publication, 26 January 2015; doi:10.1038/bmt.2014.315.
    No preview · Article · Jan 2015 · Bone Marrow Transplantation
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    ABSTRACT: A pulsed slow-positron beam generated by an electron linear accelerator was directly used for positron annihilation lifetime spectroscopy without any positron storage devices. A waveform digitizer was introduced to simultaneously capture multiple gamma-ray signals originating from positron annihilation events during a single accelerator pulse. The positron pulse was chopped and bunched with the chopper signals also sent to the waveform digitizer. Time differences between the annihilation gamma-ray and chopper peaks were calculated and accumulated as lifetime spectra in a computer. The developed technique indicated that positron annihilation lifetime spectroscopy can be performed in a 20 μs time window at a pulse repetition rate synchronous with the linear accelerator. Lifetime spectra of a Kapton sheet and a thermally grown SiO2 layer on Si were successfully measured. Synchronization of positron lifetime measurements with pulsed ion irradiation was demonstrated by this technique.
    No preview · Article · Dec 2014 · The Review of scientific instruments
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    ABSTRACT: Bosonic superweakly interacting massive particles (super-WIMPs) are a candidate for warm dark matter. With the absorption of such a boson by a xenon atom, these dark matter candidates would deposit an energy equivalent to their rest mass in the detector. This is the first direct detection experiment exploring the vector super-WIMPs in the mass range between 40 and 120 keV. With the use of 165.9 day of data, no significant excess above background was observed in the fiducial mass of 41 kg. The present limit for the vector super-WIMPs excludes the possibility that such particles constitute all of dark matter. The absence of a signal also provides the most stringent direct constraint on the coupling constant of pseudoscalar super-WIMPs to electrons. The unprecedented sensitivity was achieved exploiting the low background at a level 10^{-4} kg^{-1} keV_{ee}^{-1} day^{-1} in the detector.
    No preview · Article · Sep 2014 · Physical Review Letters
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    ABSTRACT: We present the mission design of LiteBIRD, a next generation satellite for the study of B-mode polarization and inflation from cosmic microwave background radiation (CMB) detection. The science goal of LiteBIRD is to measure the CMB polarization with the sensitivity of δr = 0:001, and this allows testing the major single-field slow-roll inflation models experimentally. The LiteBIRD instrumental design is purely driven to achieve this goal. At the earlier stage of the mission design, several key instrumental specifications, e.g. observing band, optical system, scan strategy, and orbit, need to be defined in order to process the rest of the detailed design. We have gone through the feasibility studies for these items in order to understand the tradeoffs between the requirements from the science goal and the compatibilities with a satellite bus system. We describe the overview of LiteBIRD and discuss the tradeoffs among the choices of scientific instrumental specifications and strategies. The first round of feasibility studies will be completed by the end of year 2014 to be ready for the mission definition review and the target launch date is in early 2020s.
    No preview · Conference Paper · Aug 2014
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    ABSTRACT: Background Few studies have evaluated the effects of rabeprazole on low-dose aspirin (LDA)-induced gastroduodenal injuries.AimTo conduct a randomised, double-blind, triple-dummy, active-controlled, multicentre trial, named the PLANETARIUM study, to assess the efficacy, dose–response relationship and safety of rabeprazole for peptic ulcer recurrence in Japanese patients on long-term LDA therapy.Methods Eligible patients had a history of endoscopically confirmed peptic ulcers and were receiving long-term LDA (81 or 100 mg/day) therapy for cardiovascular or cerebrovascular protection. Subjects were randomly segregated into three groups receiving rabeprazole 10 mg once daily (standard dose in Japan), rabeprazole 5 mg once daily, or teprenone (geranylgeranylacetone; mucosal protective agent commercially available in Japan) 50 mg three times per day as an active control. The primary endpoint was recurrence of peptic ulcers over 24 weeks.ResultsAmong 472 randomised subjects, 452 subjects (n = 151, 150, 151, respectively) constituted the full analysis set. The cumulative recurrence rates of peptic ulcers over 24 weeks in the 10- and 5-mg rabeprazole groups were 1.4% and 2.8%, respectively, both of which were significantly lower than that in the teprenone group (21.7%). The cumulative occurrence rate of bleeding ulcers over 24 weeks in the teprenone group was 4.6%, while bleeding ulcers were not observed in the 10- or 5-mg rabeprazole groups. Rabeprazole was well tolerated at both doses.Conclusion Rabeprazole prevents the recurrence of peptic ulcers with no evidence of a major dose–response effect in subjects on low-dose aspirin therapy.
    No preview · Article · Aug 2014 · Alimentary Pharmacology & Therapeutics
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    ABSTRACT: Bosonic super-WIMP dark matter, in particular its vector boson and pseudoscalar incarnations, were searched for with the large liquid xenon detector at the XMASS-I experiment. With the absorption of such a vector boson by a xenon atom these dark matter candidates would deposit an energy equivalent to their rest mass in the detector. In 165.9 days of data no signal was observed and stringent limits on the electron coupling of bosonic super-WIMPs with a mass in the 40- 120keV range were obtained. For vector bosons in some of this mass range our direct detection limit surpasses existing astrophysical constraints, covering new territory.
    Full-text · Article · Jun 2014 · Physical Review Letters
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    ABSTRACT: Autoantibodies to proliferating cell nuclear antigen (PCNA) are specifically, if rarely, present in systemic lupus erythematosus (SLE) patient sera. Even SLE patients lacking PCNA reactivity often show reaction to PCNA-binding protein. Here, immunoreactivity to chromatin assembly factor-1 (CAF-1), an essential molecule for DNA replication and a PCNA-binding protein, was compared for the sera of SLE patients, normal healthy controls (NHCs) and other disease controls, and in autoimmune sera reactive to standard autoantigens, by enzyme-linked immunosorbent assay (ELISA), indirect immunofluorescence, and immunoblotting. CAF1 and IRF1 expression in SLE and NHC peripheral mononuclear cells were compared by quantitative real-time polymerase chain reaction. Serum interferon-γ-inducing protein-10 and anti-double-stranded (ds)DNA antibody levels were measured by ELISA. Increased CAF-1 autoimmune reactivity was recognized in SLE or serum anti-dsDNA antibody-positive patients. Significantly greater central nervous system (CNS) involvement (aseptic meningitis) and serum anti-dsDNA antibody titers were present more often in anti-CAF-1 antibody-positive than antibody-negative SLE patients. IFN-γ positively regulated CAF-1 expression in vitro and was associated with anti-CAF-1 antibody production in SLE. Thus, a novel anti-CAF-1 autoantibody is frequently found in patients with SLE and is a useful biomarker for diagnosis, especially in cases with CNS involvement. Aberrant IFN-γ regulation appears to play an important role in anti-CAF-1 antibody production in SLE.
    No preview · Article · May 2014 · Lupus
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    ABSTRACT: Introduction and Aims: A high level of fibroblast growth factor 23 (FGF23) is a risk factor for mortality, and recent studies have linked FGF23 to parameters of volume homeostasis and an increased risk of heart failure. In hemodialysis (HD), a large ultrafiltration volume (UFV) is also associated with an increased mortality risk. We aimed to investigate whether circulating FGF23 levels and ultrafiltration volume are related in a cohort of stable HD patients. Methods: Post-hoc analysis on a prospective cohort study of 104 HD patients, median age 66 (interquartile range 51-75) years, dialysis vintage 25.0 (8.5-51.2) months, who underwent a standard four-hour HD session at the first session of the week. Blood samples were drawn at onset of HD. Plasma C-terminal FGF23 was determined by ELISA. Residual renal function (RRF) and Kt/V were extracted from patient records. We used uni- and multivariate linear regression to assess the association between UFV and FGF23. Natural log (Ln)-transformation was applied when appropriate. Results: At start of the HD session the median FGF23 level was 7535 [interquartile range 3276-13433] RU/mL. Mean UFV throughout the HD session was 2561 (standard deviation ±771) mL. In univariate analysis, natural log-transformed (Ln) FGF23 levels correlated with UFV (Figure 1), and also with serum phosphate (R=0.587, P<0.001), age (R=-0.384 P<0.001), and Ln Kt/V (R=-0.252 P=0.01), but not significantly with calcium (R=0.167 P=0.09). Multivariate linear regression analysis revealed a consistent strong association between Ln FGF23 AND UFV (St. β 0.385, P<0.001), in a model adjusted for serum phosphate (Standardized β 0.451, P<0.001) and serum calcium (St. β 0.222, P=0.002; model R2 52%). Age, gender, dialysis vintage, Kt/V, systolic and diastolic blood pressure did not contribute to this model. The association between FGF23 and UFV was independent of serum phosphate (Figures 1, 2). Patients with relevant residual renal function had a trend for lower FGF23 levels (Mann-Whitney P=0.04, Spearman’s Rho -0.230 P=0.04), however RRF was no correlate of FGF23 in multivariate analysis (St. β -0.111, P=0.16). Conclusions: In a cohort of stable HD patients we found an association between FGF23 and UFV, independent of serum phosphate. Our findings are in line with the role of exaggerated sympathetic nerve activation in patients with large UFV, as it was recently reported that sympathetic stimulation increases FGF23 release from the bone (Kawai M et al J Biol Chem 2014). Further research on this novel connection between deranged volume and phosphate homeostasis in HD patients are urgently needed and may provide clues to better integrated management of these high risk patients. View larger version: In this window In a new window Download as PowerPoint Slide
    Full-text · Article · May 2014 · Nephrology Dialysis Transplantation
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    ABSTRACT: A search for the dinucleon decay pp→K+K+ has been performed using 91.6 kton·yr data from Super-Kamiokande-I. This decay provides a sensitive probe of the R-parity-violating parameter λ112''. A boosted decision tree analysis found no signal candidates in the data. The expected background was 0.28±0.19 atmospheric neutrino induced events and the estimated signal detection efficiency was 12.6%±3.2%. A lower limit of 1.7×1032 years has been placed on the partial lifetime of the decay O16→C14K+K+ at 90% C.L. A corresponding upper limit of 7.8×10-9 has been placed on the parameter λ112''.
    No preview · Article · Apr 2014 · Physical Review Letters
  • H Ogawa · K Sorai · S Amano · K Ishii · T Kaneko
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    ABSTRACT: The statistical distributions of the secondary electrons (SEs) emitted forward and backward from a thin carbon foil have been measured simultaneously, in coincidence with foil-transmitted protons of 1.0 and 2.5 MeV, as a function of the angle of emergence, θem, of the protons. Irrespective of the incident energy, the measured SE yields increase with increasing angle of emergence in both the forward and the backward directions. As for the forward–backward correlation of the SE emission, the forward- and backward-emitted SE yields induced by 2.5 MeV protons increase gradually with increasing number of SEs emitted in the opposite directions. This positive correlation becomes slightly more pronounced with increasing angle of emergence. On the other hand, for 1.0 MeV, a positive correlation observed at θem = 0 mrad changes to a negative one at θem = 1.0 and 2.0 mrad.
    No preview · Article · Mar 2014 · Journal of Physics B Atomic Molecular and Optical Physics
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    ABSTRACT: A search for inelastic scattering of weakly interacting massive particles (WIMPs) on the isotope $^{129}$Xe was done in data taken with the single-phase liquid-xenon detector XMASS at the Kamioka Observatory. Using a restricted volume containing 41 kg of liquid xenon at the very center of our detector, we observed no significant excess of events in 165.9 live days of data. Our background reduction allowed us to derive our limits without explicitly subtracting the remaining events that are compatible with background expectations. As an example, we derive for a 50 GeV WIMP an upper limit of 3.2 pb at the 90% confidence level for its inelastic cross section on $^{129}$Xe nuclei.
    Full-text · Article · Jan 2014 · Progress of Theoretical and Experimental Physics
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    ABSTRACT: We have measured the internal proper motions of the 6.7 GHz methanol masers associated with Cepheus A (Cep A) HW2 using Very Long Baseline Interferometery (VLBI) observations. We conducted three epochs of VLBI monitoring observations of the 6.7 GHz methanol masers in Cep A-HW2 with the Japanese VLBI Network (JVN) over the period between 2006-2008. In 2006, we were able to use phase-referencing to measure the absolute coordinates of the maser emission with an accuracy of a few milliarcseconds. We compared the maser distribution with other molecular line observations that trace the rotating disk. We measured the internal proper motions for 29 methanol maser spots, of which 19 were identified at all three epochs and the remaining ten at only two epochs. The magnitude of proper motions ranged from 0.2 to 7.4 km/s, with an average of 3.1 km/s. Although there are large uncertainties in the observed internal proper motions of the methanol maser spots in Cep A, they are well fitted by a disk that includes both rotation and infall velocity components. The derived rotation and infall velocities at the disk radius of 680 au are 0.5 +- 0.7 and 1.8 +- 0.7 km/s, respectively. Assuming that the modeled disk motion accurately represents the accretion disk around the Cep A-HW2 high-mass YSO, we estimated the mass infall rate to be 3 x 10^{-4} n_8 Msun/yr (n_8 is the gas volume density in units of 10^{8} cm^{-3}). The combination of the estimated mass infall rate and the magnitude of the fitted infall velocity suggests that Cep A-HW2 is at an evolutionary phase of active gas accretion from the disk onto the central high-mass YSO. The infall momentum rate is estimated to be 5 x 10^{-4} n_8 Msun/yr km/s, which is larger than the estimated stellar radiation pressure of the HW2 object, supporting the hypothesis that this object is in an active gas accretion phase.
    Full-text · Article · Dec 2013 · Astronomy and Astrophysics
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    ABSTRACT: The removal of radioactivity from liquid scintillator has been studied in preparation of a low background phase of KamLAND. This paper describes the methods and techniques developed to measure and efficiently extract radon decay products from liquid scintillator. We report the radio-isotope reduction factors obtained when applying various extraction methods. During this study, distillation was identified as the most efficient method for removing radon-born lead from liquid scintillator. Published by Elsevier B.V.
    Full-text · Article · Dec 2013 · Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
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    ABSTRACT: To determine whether a difference in donor source affects the outcome of transplantation for patients with primary myelofibrosis (PMF), a retrospective study was conducted using the national registry data on patients who received first allogeneic hematopoietic cell transplantation (HCT) with related BM (n=19), related PBSCs (n=25), unrelated BM (n=28) or unrelated umbilical cord blood (UCB; n=11). The 5-year OS rates after related BM, related PBSC and unrelated BM transplantation were 63%, 43% and 41%, respectively, and the 2-year OS rate after UCB transplantation was 36%. On multivariate analysis, the donor source was not a significant factor for predicting the OS rate. Instead, performance status (PS) 2 (vs PS 0-1) predicted a lower OS (P=0.044), and RBC transfusion 20 times before transplantation (vs transfusion 9 times) showed a trend toward a lower OS (P=0.053). No advantage of nonmyeloablative preconditioning regimens in terms of decreasing nonrelapse mortality or increasing OS was found. Allogeneic HCT, and even unrelated BM and UCB transplantation, provides a curative treatment for PMF patients.Bone Marrow Transplantation advance online publication, 25 November 2013; doi:10.1038/bmt.2013.180.
    Full-text · Article · Nov 2013 · Bone marrow transplantation
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    ABSTRACT: LiteBIRD is a next-generation satellite mission to measure the polarization of the cosmic microwave background (CMB) radiation. On large angular scales the B-mode polarization of the CMB carries the imprint of primordial gravitational waves, and its precise measurement would provide a powerful probe of the epoch of inflation. The goal of LiteBIRD is to achieve a measurement of the characterizing tensor to scalar ratio $r$ to an uncertainty of $\delta r=0.001$. In order to achieve this goal we will employ a kilo-pixel superconducting detector array on a cryogenically cooled sub-Kelvin focal plane with an optical system at a temperature of 4~K. We are currently considering two detector array options; transition edge sensor (TES) bolometers and microwave kinetic inductance detectors (MKID). In this paper we give an overview of LiteBIRD and describe a TES-based polarimeter designed to achieve the target sensitivity of 2~$\mu$K$\cdot$arcmin over the frequency range 50 to 320~GHz.
    Full-text · Article · Nov 2013 · Journal of Low Temperature Physics

Publication Stats

11k Citations
1,769.22 Total Impact Points


  • 2011-2015
    • Nara Women's University
      • • Graduate School of Humanities and Sciences
      • • Department of Physics
      Nara, Nara, Japan
  • 2006-2015
    • Hyogo College of Medicine
      • Department of Internal Medicine
      Nishinomiya, Hyōgo, Japan
    • University of Tsukuba
      Tsukuba, Ibaraki, Japan
  • 2014
    • Kumamoto University
      Kumamoto, Kumamoto, Japan
  • 2006-2014
    • The University of Tokyo
      • Institute for Cosmic Ray Research
      白山, Tōkyō, Japan
  • 2002-2014
    • National Institute of Advanced Industrial Science and Technology
      • Electronics and Photonics Research Institute
      Tsukuba, Ibaraki, Japan
  • 1985-2014
    • Juntendo University
      • • Graduate School of Medicine
      • • Department of Dermatology
      • • Atopy (Allergy) Research Center
      • • Department of Medicine
      Edo, Tōkyō, Japan
  • 2005-2013
    • The Graduate University for Advanced Studies
      • Department of Fusion Science
      Миура, Kanagawa, Japan
  • 1999-2013
    • Osaka Prefecture University
      • Graduate School of Science
      Sakai, Ōsaka, Japan
    • Osaka University
      Suika, Ōsaka, Japan
  • 1995-2013
    • Tokyo Institute of Technology
      • Department of Physics
      Edo, Tōkyō, Japan
    • Fujitsu Ltd.
      Kawasaki Si, Kanagawa, Japan
  • 1973-2013
    • Nagoya University
      • Solar-Terrestrial Environment Laboratory
      Nagoya, Aichi, Japan
  • 2012
    • Tottori University
      • Faculty of Agriculture
      TTJ, Tottori, Japan
  • 2003-2011
    • Japan Atomic Energy Agency
      • Nuclear Science and Engineering Directorate
      Muramatsu, Niigata, Japan
    • Hiroshima Institute of Technology
      Hirosima, Hiroshima, Japan
  • 2010
    • Kanazawa University
      Kanazawa, Ishikawa, Japan
    • Tokyo Gakugei University
      Koganei, Tōkyō, Japan
  • 2009
    • Saitama Medical University
      Saitama, Saitama, Japan
  • 2008
    • National Institutes Of Natural Sciences
      Edo, Tōkyō, Japan
  • 1979-2008
    • National Institute of Radiological Sciences
      • Research Center for Charged Particle Therapy
      Tiba, Chiba, Japan
  • 1920-2008
    • Saga University
      • • Synchrotron Light Application Center
      • • Department of Electrical & Electronic Engineering
      Сага Япония, Saga Prefecture, Japan
  • 1998-2007
    • RIKEN
      • Nishina Center for Accelerator-Based Science (RNC)
      Вако, Saitama, Japan
  • 1997-2007
    • Osaka City University
      • • Graduate School of Medicine
      • • Department of Neurosurgery
      Ōsaka, Ōsaka, Japan
    • Sophia University
      • Division of Physics
      Edo, Tōkyō, Japan
  • 2002-2006
    • National Institute for Fusion Science
      • Department of Helical Plasma Research
      Tokitsu-chō, Gifu, Japan
  • 1998-2006
    • Tohoku University
      • • Research Center for Neutrino Science
      • • Department of Physics
      Sendai-shi, Miyagi-ken, Japan
  • 1999-2003
    • Boston University
      • Department of Physics
      Boston, Massachusetts, United States
  • 2001-2002
    • Rikkyo University
      • Department of Physics
      Tokyo, Tokyo-to, Japan
  • 2000
    • Aichi Medical University
      • Division of Internal Medicine
      Okazaki, Aichi, Japan
    • National Institute of Animal Health
      Ibaragi, Ōsaka, Japan
    • Chiba University
      Tiba, Chiba, Japan
  • 1994
    • Keio University
      • Department of Dermatology
      Edo, Tōkyō, Japan
  • 1993
    • Kyoto University
      • Department of Dermatology
      Kyoto, Kyoto-fu, Japan
  • 1991
    • Tokyo Metropolitan Institute of Medical Science
      Edo, Tōkyō, Japan