Nagoya-shi, Japan
Nagoya-shi, Japan

Aichi Shukutoku University is a private university in Nagakute, Aichi, Japan. The predecessor of the school was founded in 1905. It was chartered as a women's college in 1975 and became co-educational in 1995. Wikipedia.

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Shen H.,Nankai University | Toki H.,Osaka University | Oyamatsu K.,Aichi Shukutoku University | Sumiyoshi K.,High Energy Accelerator Research Organization
Astrophysical Journal, Supplement Series | Year: 2011

We construct the equation of state (EOS) of dense matter covering a wide range of temperature, proton fraction, and density for the use of core-collapse supernova simulations. The study is based on the relativistic mean-field (RMF) theory, which can provide an excellent description of nuclear matter and finite nuclei. The Thomas-Fermi approximation in combination with assumed nucleon distribution functions and a free energy minimization is adopted to describe the non-uniform matter, which is composed of a lattice of heavy nuclei. We treat the uniform matter and non-uniform matter consistently using the same RMF theory. We present two sets of EOS tables, namely EOS2 and EOS3. EOS2 is an update of our earlier work published in 1998 (EOS1), where only the nucleon degree of freedom is taken into account. EOS3 includes additional contributions from Λ hyperons. The effect of Λ hyperons on the EOS is negligible in the low-temperature and low-density region, whereas it tends to soften the EOS at high density. In comparison with EOS1, EOS2 and EOS3 have an improved design of ranges and grids, which covers the temperature range T = 0.1-10 2.6MeV with the logarithmic grid spacing Δlog 10(T/[MeV]) = 0.04 (92points including T = 0), the proton fraction range Yp = 0-0.65 with the linear grid spacing ΔYp = 0.01 (66points), and the density range ρB = 10 5.1-1016 g cm-3 with the logarithmic grid spacing Δlog10(ρB/[g cm-3]) = 0.1 (110points). © 2011. The American Astronomical Society. All rights reserved.

Sotani H.,Japan National Astronomical Observatory | Nakazato K.,Tokyo University of Science | Iida K.,Kochi University | Oyamatsu K.,Aichi Shukutoku University
Physical Review Letters | Year: 2012

We general-relativistically calculate the frequency of fundamental torsional oscillations of neutron star crusts, where we focus on the crystalline properties obtained from macroscopic nuclear models in a way that is dependent on the equation of state of nuclear matter. We find that the calculated frequency is sensitive to the density dependence of the symmetry energy, but almost independent of the incompressibility of symmetric nuclear matter. By identifying the lowest-frequency quasiperiodic oscillation in giant flares observed from soft gamma-ray repeaters as the fundamental torsional mode and allowing for the dependence of the calculated frequency on stellar models, we provide a lower limit of the density derivative of the symmetry energy as L 50MeV. © 2012 American Physical Society.

Sotani H.,Japan National Astronomical Observatory | Nakazato K.,Tokyo University of Science | Iida K.,Kochi University | Oyamatsu K.,Aichi Shukutoku University
Monthly Notices of the Royal Astronomical Society: Letters | Year: 2013

We consider how superfluidity of dripped neutrons in the crust of a neutron star affects the frequencies of the crust's fundamental torsional oscillations.Anon-negligible superfluid part of dripped neutrons, which do not comove with nuclei, acts to reduce the enthalpy density and thus enhance the oscillation frequencies. By assuming that the quasi-periodic oscillations observed in giant flares of soft gammarepeaters arise from the fundamental torsional oscillations and that themass and radius of the neutron star are in the range 1.4≤M/M⊙ ≤1.8 and 10≤R≤14 km, we constrain the density derivative of the symmetry energy as 100 ≲ L ≲ 130 MeV, which is far more severe than the previous one, L ≳ 50 MeV, derived by ignoring the superfluidity. © 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Sotani H.,Kyoto University | Nakazato K.,Tokyo University of Science | Iida K.,Kochi University | Oyamatsu K.,Aichi Shukutoku University
Monthly Notices of the Royal Astronomical Society | Year: 2013

We systematically examine the fundamental frequencies of shear torsional oscillations in neutron star crusts in a manner that is dependent on the parameter L characterizing the poorly known density dependence of the symmetry energy. The identification of the lowest quasiperiodic oscillation (QPO) among the observedQPOs from giant flares in soft-gamma repeaters as the l = 2 fundamental torsional oscillations enables us to constrain the parameter L as L ≤ 47.4MeV, which is the most conservative restriction on L obtained in the present work that assumes that the mass and radius of the flaring neutron stars range 1.4-1.8M⊙ and 10-14 km. Next, we identify one by one a set of the low-lying frequencies observed in giant flares as the fundamental torsional oscillations. The values of L that can reproduce all the observed frequencies in terms of the torsional oscillations coupled with a part of dripped neutrons via entrainment effects are then constrained as 101.1 ≤ L ≤ 131.0MeV. Alternatively, if only the second lowest frequency observed in SGR 1806-20 has a different origin, one obtains relatively low L values ranging 58.0 ≤ L ≤ 85.3MeV, which seem more consistent with other empirical constraints despite large uncertainties. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

Hirata Y.,Colgate University | Amano S.,Aichi Shukutoku University
Journal of the Acoustical Society of America | Year: 2012

This study examined the durational structure of single and geminate stop distinction produced in three- and four-mora words of Japanese, (C 1)V1(C2)C2V2X [(C 2)C2 the contrasting consonants; X a CV mora, the moraic nasal, or a long vowel as part of V2]. The questions addressed were how factors such as speaking rate, segmental variability, and moraic composition of words affected the stop quantity distinction in words longer than well-studied disyllabic words, and whether there exists an invariant parameter that classified these two stop categories. Results showed that all of those factors systematically affected the duration of the contrasting stop closure, the unit of [(C1)V1(C2)C2V 2], and the entire three- and four-mora words. However, the durational units of moras and words were well-structured, and the ratio of the contrasting stop closure to the [(C1)V1(C 2)C2V2] unit, as well as the ratio of the closure to the entire word, were found to be invariant in indicating the stop quantity distinction. These results support the theory of relational acoustic invariance [Pickett, Phonetica 56, 135-157 (1999)] on the part of production. Furthermore, the results provide insight into different versions of Japanese mora hypothesis [Han, The Study of Sounds 10, 65-80 (1962); Port, J. Acoust. Soc. Am. 81(5), 1574-1585 (1987)], which have been under debate for five decades. © 2012 Acoustical Society of America.

The aim of this study was to clarify the effects of tendinous tissue properties on origin of greater force output at short inter-pulse intervals in the 2-pulse trains compared to those at longer inter-pulse intervals. Thus, this study investigated the contributions of the second stimulus (C2) in 2-pulse trains with different inter-pulse intervals on the torque response and tendinous tissue properties of human skeletal muscle in vivo. The torque response and tendinous tissue elongation following single pulses and 2-pulse trains at different inter-pulse intervals (5, 10, 20, 30, 40, 50, 80, 100, 150, and 200 ms) were recorded in the tibialis anterior muscle using real-time ultrasonography. C2 with inter-pulse intervals of 5-100 ms invoked significantly greater torque responses than single pulses. In contrast, the elongation and compliance of tendinous tissue for C2 with inter-pulse intervals from 5-80 ms were significantly lower than those of the single-pulse response. A significant negative relationship between torque response and tendinous tissue compliance was observed in C2 with different inter-pulse intervals. The torque response as a result of C2 is greater at short inter-pulse intervals in which the force summation due to second stimulus coincides with the period of decreased tendinous tissue compliance due to the first stimulus.

Umebayashi K.,Aichi Shukutoku University | Okita T.,Aichi Shukutoku University
Brain Research | Year: 2010

To investigate whether a task rule carried over from the preceding trial modifies an early portion of the stimulus-locked lateralized readiness potential (sLRP), participants were asked to perform two different flanker tasks that were switched. One task required a left-hand response for a central letter "H" in a five-letter array, and a right-hand response for "S." The stimulus-response rule was reversed for the other task. Reaction times (RTs) were prolonged for switch trials as compared to repeat trials, irrespective of whether stimuli in the five-letter array were congruent or incongruent flankers. For the incongruent stimuli, the onset latency of the sLRP was shorter on switch trials compared to repeat trials although the onset for congruent stimuli was delayed on the switch trials. These different sLRP effects as a function of congruent versus incongruent stimuli were interpreted as a manifestation that automatic response activation, dependent on a task rule carried over from a preceding trial, was induced by the early transmission of flanker-related information from stimulus evaluation processes. The finding that the earlier sLRP onset for incongruent stimuli on switch trials did not shorten RTs suggests that RT switch costs are not attributable simply to passive processes. © 2010 Elsevier B.V.

Suwa M.,Aichi Shukutoku University | Suzuki K.,Aichi Shukutoku University
Journal of Psychopathology | Year: 2013

Objectives: In Japan today it is believed that there are a million young adults who refuse to work and who avoid social contact. This phenomenon, known as "hikikomori" (social withdrawal), has become a serious socio-psychological problem throughout the country. However, there has been little psychopathological consideration of this phenomenon, and no detailed discussion of diagnosis. In this article, we investigate the phenomenon from a psychiatric perspective by introducing the concept of "primary hikikomori" and examining its relationship to recent changes in Japanese society. Methods: We reviewed several studies concerning the epidemiology and psychopathology of hikikomori. As psychiatrists, we have considerable experience treating hikikomori youth (referred to simply as hikikomori) in individual therapy, group therapy, family therapy and family group therapy sessions. Based on this experience, we present a typical case of "primary hikikomori" and identify its psychological features. We also analyze hikikomori from a socio-cultural perspective. The observations made herein are based on this first-hand clinical experience as well as careful consideration of a number of other psychiatric and sociological reports concerning hikikomori. Results: Firstly, a typical case of hikikomori is presented. Secondly, we identified the psychological features of "primary hikikomori", or hikikomori with no obvious mental disorder, as follows: 1) display a tendency to avoid competitive settings; 2) cherish an "ideal image" based on the expectations of others; 3) are unable to make a fresh start from their current situation; and 4) have parents who continue to invest in their child's ideal image. We assert that "primary hikikomori" is a new manifestation of the conflict prevalent among contemporary Japanese youth. Thirdly, we discuss possible contributing factors to the phenomenon from three viewpoints: 1) changes in the socio-cultural constellation; 2) changes in communication; 3) changes in the labour system and examined the implications of such widespread change. Conclusions: We believe that it is necessary to consider the possibility that the hikikomori phenomenon, which emerged in Japan in the 1990s, might be the first sign of a larger disturbance within present-day society in general. Moreover, the pathology of societies giving rise to this hikikomori phenomenon ought to be examined. Copyright © 2013 by Pacini Editore S.p.A.

Kashii S.,Aichi Shukutoku University
Journal of Neuro-Ophthalmology | Year: 2014

Immunoglobulin G4-related disease (IgG4-RD) is a multifocal inflammatory disorder that causes tumefactive lesions with a dense lymphoplasmacytic infiltrate rich in IgG4 plasma cells and storiform-pattern fibrosis. The clinical symptoms are relatively mild, and the condition is usually recognized by organ swelling and damage. When referring to the ophthalmic manifestations of IgG4-RD, the term IgG4-related ophthalmic disease (IgG4-ROD) is used. IgG4-ROD is characterized by bilateral lacrimal gland enlargement accompanied by 3 distinctive features: infraorbital nerve enlargement, extraocular myo-sitis, and compressive optic neuropathy. IgG4 implies an underlying systemic disease process requiring evaluation to detect other systemic involvement. This includes hypo-physitis and hypertrophic pachymeningitis, entities of neuro-ophthalmic interest. IgG4-ROD usually responds favorably to systemic corticosteroids but may be compli-cated by relapse during steroid taper. Rituximab has been shown to be effective for controlling steroid-refractory IgG4-RD. In contrast to IgG4-RD, an increasing number of cases of extranodal marginal B-cell lymphoma (MALT type) associated with IgG4-ROD have been described. IgG4 may be a risk factor for later emergence of low-grade B-cell lymphoma. © 2014 by North American Neuro-Ophthalmology Society.

Amano S.,Aichi Shukutoku University
The Journal of the Acoustical Society of America | Year: 2010

The theory of relational acoustic invariance [Pickett, E. R., et al. (1999). Phonetica 56, 135-157] was tested with the Japanese stop quantity distinction in disyllables spoken at various rates. The questions were whether the perceptual boundary between the two phonemic categories of single and geminate stops is invariant across rates, and whether there is a close correspondence between the perception and production boundaries. The durational ratio of stop closure to word (where the "word" was defined as disyllables) was previously found to be an invariant parameter that classified the two categories in production, but the present study found that this ratio varied with different speaking rates in perception. However, regression and discriminant analyses of perception and production data showed that treating stop closure as a function of word duration with an intercept term represented the perception and production boundaries very well. This result indicated that the durational ratio of adjusted stop closure (i.e., closure with an added constant) to the word was invariant and distinguished the two phonemic categories clearly. Taken together, the results support the relational acoustic invariance theory, and help refine the theory with regard to exactly what form 'invariance' can take.

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