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Search Results: 1 - 10 of 150728 matches for " H. Ikeda "
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Pseudogap and Superconductivity in Iron-Based Layered Superconductor studied by Fluctuation-Exchange Approximation
H. Ikeda
Physics , 2008, DOI: 10.1143/JPSJ.77.123707
Abstract: We investigate interplay between magnetic fluctuations and superconductivity in the effective five-band Hubbard model for iron-oxypnictide superconductors on the basis of the fluctuation-exchange approximation. As for the normal-state properties, we find the pseudogap behavior in the NMR relaxation rate and the spectral weight in the electron-doped region, while we cannot find such behavior in the hole-doped region. The pseudogap behavior originates from the band structure effect, that is, existence of high density of states just below the Fermi level. Solving the superconducting Eliashberg equation, we find that the most probable candidate for the pairing symmetry is the sign-changed s-wave spin-singlet state. For small Hund's coupling J, the eigenvalue is not so sensitive to carrier doping, and seems to be irrelevant with antiferromagnetic (AF) spin fluctuation. We suggest that correlation between spin and spin-quadrupole is important as the pairing mechanism as well as the AF fluctuation.
Dynamic Characteristics of Selemion CMV-Based IPMC Actuators in High Humidity Environment  [PDF]
H. Ngetha, M. Sasaki, H. Tamagawa, S. Ito, K. Ikeda
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.211006
Abstract:

Electrically-induced bending of Selemion IPMC is caused by the charge induced into the IPMC. This induced charge quantity is susceptible to the absolute humidity of environment. There are two types of charges, the charge causing bending and the rest of charge that causes no bending. In the high humidity environments, where absolute humidity is above 10 gm-3, the quantity of charge causing no bending accounts for the large part of whole charge induced into the Selemion IPMC, while quantity of such charge is negligibly small at the absolute humidity of less than 10 gm-3. Estimating the quantity of those two types of charges individually, we successively analyzed the bending stability of Selemion IPMC at the absolute humidity above 10 gm-3. Consequently, we deduced the following conclusions. 1) There exists a large time delay in the current in response to the voltage input, 2) Current is highly dumping, and 3) Bending behavior is marginally stable under the input of any frequency.

Longitudinal study of self-awakening and sleep/wake habits in adolescents
Ikeda H, Hayashi M
Nature and Science of Sleep , 2012, DOI: http://dx.doi.org/10.2147/NSS.S33861
Abstract: ngitudinal study of self-awakening and sleep/wake habits in adolescents Original Research (1637) Total Article Views Authors: Ikeda H, Hayashi M Published Date September 2012 Volume 2012:4 Pages 103 - 109 DOI: http://dx.doi.org/10.2147/NSS.S33861 Received: 14 May 2012 Accepted: 17 July 2012 Published: 03 September 2012 Hiroki Ikeda,1 Mitsuo Hayashi2 1Department of Adult Mental Health, National Institute of Mental Health, National Center of Neurology and Psychiatry, Tokyo; 2Department of Behavioral Sciences, Graduate School of Integrated Arts and Sciences, Hiroshima University, Hiroshima, Japan Abstract: Self-awakening is the ability to awaken without external assistance at a predetermined time. Cross-sectional studies reported that people who self-awaken have sleep/wake habits different from those of people who use external means to wake from sleep. However, no longitudinal study has examined self-awakening. The present study investigated self-awakening, both habitual and inconsistent, compared to awakening by external means in relation to sleep/wake schedules for five consecutive years in 362 students (starting at mean age 15.1 ± 0.3 years). Students who self-awakened consistently for five consecutive years (5% of all students) went to bed earlier than those who inconsistently self-awakened (mixed group, 40%) or consistently used forced awakening by external means (56%). Awakening during sleep was more frequent and sleep was lighter in the consistently self-awakened group than in the mixed and consistently forced-awakened groups. However, daytime dozing was less frequent and comfort immediately after awakening was greater for the consistently self-awakened group than for the mixed and consistently forced-awakened groups. These results indicate that the three groups have different sleep/wake habits. Previous studies of self-awakening using cross-sectional survey data may have confounded both consistent and inconsistent self-awakening habits. A longitudinal study is necessary to clarify the relationship between the self-awakening habit and sleep/wake patterns.
Longitudinal study of self-awakening and sleep/wake habits in adolescents
Ikeda H,Hayashi M
Nature and Science of Sleep , 2012,
Abstract: Hiroki Ikeda,1 Mitsuo Hayashi21Department of Adult Mental Health, National Institute of Mental Health, National Center of Neurology and Psychiatry, Tokyo; 2Department of Behavioral Sciences, Graduate School of Integrated Arts and Sciences, Hiroshima University, Hiroshima, JapanAbstract: Self-awakening is the ability to awaken without external assistance at a predetermined time. Cross-sectional studies reported that people who self-awaken have sleep/wake habits different from those of people who use external means to wake from sleep. However, no longitudinal study has examined self-awakening. The present study investigated self-awakening, both habitual and inconsistent, compared to awakening by external means in relation to sleep/wake schedules for five consecutive years in 362 students (starting at mean age 15.1 ± 0.3 years). Students who self-awakened consistently for five consecutive years (5% of all students) went to bed earlier than those who inconsistently self-awakened (mixed group, 40%) or consistently used forced awakening by external means (56%). Awakening during sleep was more frequent and sleep was lighter in the consistently self-awakened group than in the mixed and consistently forced-awakened groups. However, daytime dozing was less frequent and comfort immediately after awakening was greater for the consistently self-awakened group than for the mixed and consistently forced-awakened groups. These results indicate that the three groups have different sleep/wake habits. Previous studies of self-awakening using cross-sectional survey data may have confounded both consistent and inconsistent self-awakening habits. A longitudinal study is necessary to clarify the relationship between the self-awakening habit and sleep/wake patterns.Keywords: habitual self-awakening, sleep/wake pattern, adolescent
O(a^2) improvement of the overlap-Dirac operator
H. Ikeda,S. Hashimoto
Physics , 2009,
Abstract: We construct an $O(a^2)$-improved overlap-Dirac operator by designing an improved overlap kernel, based on the Symanzik improvement program. Field rotation terms are also identified to improve off-shell amplitudes for both massless and massive fermions. We check the free dispersion relation and propagator, and show that improved results become to close to the continuum ones at low momentum region. We test the effect of improvement on the full-QCD gauge configuration and find that the relativistic dispersion relation is satisfied within a few percent error up to $m_qa \approx 0.5$.
New sepsis-related marker: endotoxin activity assay
T Ikeda, K Ikeda, H Taniuchi, M Hiramatsu, S Suda
Critical Care , 2010, DOI: 10.1186/cc9115
Abstract: The EAA was studied in a cohort of 153 septic patients admitted to the ICU. At the same time, IL-6 (chemiluminescent enzyme immunoassay), C-reactive protein (CRP), procalcitonin (PCT, chemiluminescent enzyme immunoassay) and plasminogen activator inhibitor-1 (PAI-1, latex photometric immunoassay) were measured within 24 hours after ICU admission. The patients were divided into the following three groups: L group: EAA < 0.4, M group: 0.4 ≤ EAA < 0.6, H group: 0.6 ≤ EAA. Nonrepeated-measures ANOVA was used to compare over three groups or conditions. Statistical significance was assumed for values of P < 0.05. Normally distributed data are presented as mean ± SD, and abnormally distributed data are presented as median values.Of the 153 patients, the L group contained 61 patients, M group 41 patients, and H group 51 patients, respectively. On the day of ICU admission, the rate of EAA ≥0.4 was 60.1% (MEDIC study: 57.2%). APACHE score in the L group was 21.0 ± 7.9, M group 24.8 ± 8.4, H group 26.4 ± 8.9, and SOFA score in the L group was 8.2 ± 4.3, M group 8.9 ± 4.1, H group 9.5 ± 4.3, respectively. There was no statistically significant difference among the groups. The median value of PCT in the L group was 1.1 ng/ml, M group 5.9 ng/ml, H group 8.5 ng/ml, respectively. PCT values of the M and H groups were significantly higher than those of the L group. Median IL-6 level of the H group was significantly higher than that of the L group (H group: 2,635 pg/ml, L group: 177 pg/ml).EAA has no significant correlation with other sepsis-related markers, but may be associated with body insults (inflammation or infection).
Sentinel Lymph Node Biopsy as Guidance for Lateral Neck Dissection in Patients with Papillary Thyroid Carcinoma  [PDF]
Yoshifumi Ikeda
Surgical Science (SS) , 2011, DOI: 10.4236/ss.2011.22012
Abstract: Introduction: The surgical management of lateral lymph nodes in differentiated thyroid carcinoma is controversies. Therefore, we analyzed whether sentinel lymph nodes (SLN) biopsy of the first draining nodes in the jugulo-carotid chain is an accurate technique to select patients with true-positive but nonpalpable lymph nodes for selective lateral node dissection. Materials and Methods: From January 2009 to December 2009, 12 patients with solitary papillary carcinoma measuring 2 cm by ultrasonography were included in this study. After the thyroid gland was exposed to avoid injuring the lateral thyroid lymphatic connection, approximately 0.2 ml of 5mg/ml indocyanine green was injected into the parenchyma of upper and lower thyroid gland. Some stained lymph nodes in the jugulo-carotid chain could be identified following the stained lymphatic duct and dissected as the SLN. After that, thyroidectomy with modified neck dissection was performed. Results: The mean tumor size was 22.1 ± 4.6 mm. Identification and biopsy of stained SLN in the ipsilateral jugulo-carotid chain was successful in all 12 cases. In 6 cases, histopathological analysis of SLNs revealed metastases of the papillary thyroid carcinoma. Among them, 2 cases had additional metastatic lymph nodes in the ipsilateral compartment. Of the 6 patients who had negative lymph node metastasis (LNM) in SLNs, all patients had negative LNM in the ipsilateral compartment. Conclusions: The method may be helpful in the detection of true-positive but nonpalpable lymph nodes and may support a decision to perform a selective lateral node dissection in patients with papillary thyroid carcinoma.
Representation of the n-th derivative of the normal PDF using Bernoulli numbers and gamma function
M. A. de Oliveira,R. H. Ikeda
Applied Mathematical Sciences , 2012,
Abstract:
Tensor optimized shell model using bare interaction for light nuclei
Myo T.,Toki H.,Ikeda K.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100304019
Abstract: We propose a new theoretical approach to calculate nuclear structure using bare nuclear interaction, in which the tensor and short-range correlations are described by using the tensor optimized shell model (TOSM) and the unitary correlation operator method (UCOM), respectively. We compare the obtained results using TOSM+UCOM for 4He with the rigorous calculation. We also apply TOSM to the analysis of two-neutron halo nuclei, 6He and 11Li, on the basis of the “core with TOSM”+n+n model. The halo formation of 11Li is explained by inclusion of the tensor correlation in 9Li core, which produces the Pauli-blocking on the p-wave neutrons in 11Li and enhances the s-wave component of halo structure.
Intratendinous ganglion in the extensor tendon of a finger: A case report.
Ikeda K,Tomita K,Matsumoto H
Journal of Orthopaedic Surgery , 2001,
Abstract:
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