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Masatoshi Sato,Yoshiaki Kobayashi,Takayuki Kawamata,Yukio Yasui,Kazunori Suzuki,M. Itoh,Ryoichi Kajimoto,Kazuhiko Ikeuchi,M. Arai,Phillipe Bourges 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
To identify the superconducting symmetry of Fe-based superconductors, we studied effects ofnonmagnetic-impurities on Tc, magnetic excitation spectra 00 and NMR 1/T1 − T curve, whichare sensitive to the relative signs between the order parameters on the disconnected Fermi surfacesin reciprocal space, because the symmetry is closely connected with the pairing mechanism:If the signs are opposite (symmetry S±), the mechanism is considered to be a magneticone, but when the signs are the same (symmetry S++), a novel mechanism is plausible becausethe ordinary phonon mechanism cannot realize the Tc value as high as 55 K found in Ln1111(Ln=lanthanide). Results are as follows: (a) The very small rates of Tc-suppression by impurityatoms M of LnFe1−yMyAs0.89−xF0.11+x (M=Ni, Co, Ru) can be explained only by S++. (b) The00-data for Ba(Fe, Co)2As2 (Tc 23 K) and Ca-Fe-Pt-As crystals seem to be well explained byS++ rather than by S±. (c) The nuclear magnetic resonance data can be consistently understoodby S++, too. These results suggest the S++ symmetry and a novel pairing mechanism, which canbe considered to be related to the elastic softening of C66 induced by the orbital fluctuation of thesystem.
Masatoshi Uno,Ryuichi Igarashi,Yusuke Sato 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Photovoltaic (PV) systems consist of multiple dcdc converters, such as a front-end converter for PV panel control and bidirectional converter for battery regulation. In addition, a differential power processing (DPP) converter is desirably installed to preclude partial shading issues of the significant reduction in energy yield and occurrence of multiple maximum power points. To simplify such PV systems by reducing the converter count, this paper proposes a novel multiport converter (MPC) based on a switched capacitor converter (SCC) with DPP capability. The proposed MPC can be derived by integrating a noninverting PWM buck-boost converter, SCC, and phase-shift (PS) SCC with sharing switches, realizing the simplified system and circuit. The proposed MPC can regulate the load and battery by PWM and PS controls, respectively, while precluding the partialshading issues by its DPP capability. The experimental verification using a 150-W prototype demonstrated the load and battery could be independently regulated with preventing the partial shading issues.
High-energy Magnetic Excitations in Underdoped La1.90Sr0.10CuO4
Kentaro Sato,Masato Matsuura,Masaki Fujita,Ryoichi Kajimoto,Sungdae Ji,Kazuhiko Ikeuchi,Mitsutaka Nakamura,Yasuhiro Inamura,Masatoshi Arai,Masanori Enoki,Kazuyoshi Yamada 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We measured the magnetic excitations in underdoped (UD) La1.90Sr0.10CuO4 by using inelasticneutron scattering over a wide energy range. We succeeded in observing the high-energy excitationsup to '160 meV. Hour-glass-like magnetic excitation, which is commonly seen in the superconductingphase of cuprate oxides, was confirmed. The Ecross (the energy where the dispersion is closestto the ( 12 , 12 ) reciprocal position) of 40 meV follows a linear relation between Ecross and the dopedhole concentration in the UD region. From the dispersion of high-energy excitations above Ecross,we successfully found an effective nearest neighbor interaction (Jeff ) of 102 ± 2 meV. This Jeff issmaller than the nearest neighbor interaction J(=132 meV) in the parent compound La2CuO4,indicating a reduction of Jeff by hole-doping.
Yoshihiko Ogawa,Masatoshi Sato,Takaya Yamashita,Ryuichi Nakano,Satoshi Mochizuki,Kei Kasahara,Hisakazu Yano,Keiichi Mikasa 대한진단검사의학회 2018 Annals of Laboratory Medicine Vol.38 No.1
Dear Editor, Intraabdominal infections are well-known sources of polymicrobial bacteremia [1, 2]. Anaerobes such as Bacteroides spp. and Clostridium spp. account for 30–50% of these cases [2-4]. However, a significant proportion of anaerobes remain unidentified. Lee et al [5] reported that the conventional identification method correctly identifies anaerobic bacteria only 79.4% to the genus level and 60.1% to the species level. Here, we report a case of polymicrobial bacteremia with three anaerobes in a patient with peritonitis following intestinal perforation. The anaerobes included Butyricimonas virosa and Brachyspira pilosicoli, both of which are difficult to identify by the conventional identification method
Magnetism and Superconductivity in RbxFe2−ySe2
Kazuki Ohishi,Masatoshi Sato,Shouhei Kototani,Shunsuke Saiki,Yoshiaki Kobayashi,Masayuki Itoh 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have performed zero-field muon spin relaxation measurements in single-crystalline samplesof superconducting (SC) RbxFe2−ySe2 (Tc = 29 K) and non-SC RbxFe2−ySe2 in order to elucidatewhether there is difference in the magnetic states between SC and non-SC systems. In the SCsample, no temperature dependence of the muon spin polarization was observed at temperaturesbelow 40 K while a decrease in the spin polarization was observed in the non-SC sample withdecreasing temperature. This suggests that a new magnetically ordered state seems to develop inthe non-SC sample.
Yoshiya Tada,Yusuke Sato,Masatoshi Uno 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Interleaved converters are a typical solution to enhance a current capacity and reduce current ripples of input or output ports. Conventional interleaved LLC converters need additional switches and feedback control loop, or some passive components, for active current balancing, increasing the circuit complexity and cost. This paper proposes a novel three-phase interleaved LLC converter with an automatic capacitive current balancing capability. Two flying capacitors contribute to not only the automatic capacitive current balancing but also reduced switch voltage stresses and asymmetric resonant operations to reduce RMS currents. The operation analysis and capacitive current balancing capability are discussed. The experimental verification using a 1-kW prototype demonstrated that the automatic capacitive current balancing could be achieved despite the significant mismatch in transformers’ parameters.
Yukihiko Shirayama,Michio Takahashi,Masatoshi Suzuki,Yoshiaki Tsuruoka,Koichi Sato 대한정신약물학회 2014 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.12 No.3
Objective: This open-label study examined the effects of ramelteon on cognitive functions in 10 outpatients with schizophrenia. Methods: Ramelteon (8 mg/day) was administered to 10 patients with schizophrenia for six months. The verbal fluency test,Trail-Making Test, the Wisconsin Card Sorting Test, the Stroop Test, the Digit Span Distraction Test, Iowa Gambling Task, theRey Auditory Verbal Learning Test were evaluated at baseline and 6 months after treatment with ramelteon. Results: Ramelteon improved significantly the scores of Rey Auditory Verbal Learning Test. Additionally, ramelteon exerted improvementsin the verbal fluency and Iowa Gambling Task in 4 patients. Conclusion: Ramelteon could be a potential therapeutic drug, in adjunctive treatment of learning and memory deficits seenin patients with schizophrenia.
Factors Associated with Early Hospital Arrival in Patients with Acute Ischemic Stroke
Song, Dongbeom,Tanaka, Eijirou,Lee, Kijeong,Sato, Shoichiro,Koga, Masatoshi,Kim, Young Dae,Nagatsuka, Kazuyuki,Toyoda, Kazunori,Heo, Ji Hoe Korean Stroke Society 2015 Journal of stroke Vol.17 No.2
<P><B>Background and Purpose</B></P><P>Factors associated with early arrival may vary according to the characteristics of the hospital. We investigated the factors associated with early hospital arrival in two different stroke centers located in Korea and Japan.</P><P><B>Methods</B></P><P>Consecutive patients with ischemic stroke arrived hospital within 48 hours of onset between January 2011 and December 2012 were identified and the clinical and time variables were retrieved from the prospective stroke registries of Severance Hospital of Yonsei University Health System (YUHS; Seoul, Korea) and National Cerebral and Cardiovascular Center (NCVC; Osaka, Japan). Subjects were dichotomized into early (time from onset to arrival ≤4.5 hours) and late (>4.5 hours) arrival groups. Univariate and multivariate analyses were performed to evaluate factors associated with early hospital arrival.</P><P><B>Results</B></P><P>A total of 1,966 subjects (992 from YUHS; 974 from NCVC) were included in this study. The median time from onset to arrival was 6.1 hours [interquartile range, 1.7-17.8 hours]. In multivariate analysis, the factors associated with early arrival were atrial fibrillation (Odds ratio [OR], 1.505; 95% confidence interval [CI], [1.168-1.939]), higher initial National Institute of Health Stroke Scale scores (OR, 1.037; 95% CI [1.023-1.051]), onset during daytime (OR, 2.799; 95% CI [2.173-3.605]), and transport by an emergency medical service (OR, 2.127; 95% CI [1.700-2.661]). These factors were consistently associated with early arrival in both hospitals.</P><P><B>Conclusions</B></P><P>Despite differences between the hospitals, there were common factors related to early arrival. Efforts to identify and modify these factors may promote early hospital arrival and improve stroke outcome.</P>