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Teacher Resilience and the Effectiveness of Physical Education and Sports in Japan
( Kazuma Maeda ) 중앙대학교 학교체육연구소 2021 Asian Journal of Physical Education of Sport Scien Vol.9 No.6
In recent years, the deterioration of mental health among teachers has become a serious problem in Japanese schools. Moreover, such teacher turnover has become a problem in other countries as well. Nonetheless, resilience has recently gained scholarly attention as an effective means of maintaining and improving mental health. Scholars have argued that resilience among teachers is an issue related to the assurance of quality education, which has attracted international attention. Consequently, several studies in Japan have been conducted on teacher resilience. At present, however, methods for measuring teacher resilience are lacking. As such, the field remains unable to confirm the effect of its improvement using accurate data. Therefore, this study aims to examine the factors related to the resilience of teachers as the first step toward developing a scale for its measurement. In particular, it investigates resilience among teachers in secondary education. In the future, however, it intends to identify differences in resilience according to the types of schools and subjects. The result produced seven factors related to the resilience of teachers in secondary education, namely, optimism, ambition, social skills, insight, example, self-control, and support readiness. Additionally, based on previous studies, formulating a program that incorporates sports as a strategy for increasing teacher resilience may be effective.
Kazuma Kitaguchi,Masafumi Kashii,Kosuke Ebina,Satoru Sasaki,Yasunori Tsukamoto,Hideki Yoshikawa,Tsuyoshi Murase 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.5
Study Design: An open-label, non-randomized prospective study. Purpose: Teriparatide (TPTD) is known to be an antiosteoporotic agent that may accelerate the healing of fractures. This study was designed to investigate the effect of once-weekly TPTD administration on vertebral stability and bony union after acute osteoporotic vertebral fracture (OVF). Overview of Literature: Once-weekly TPTD administration can lead to early vertebral stability and promote bony union of fractured vertebrae in patients with severe osteoporosis. Methods: Forty-eight subjects with acute OVF were assigned to receive activated vitamin D3 and calcium supplementation or once-weekly subcutaneous injection of TPTD (56.5 µg) in combination with activated vitamin D3 and calcium supplementation for 12 weeks. Vertebral stability was assessed using lateral plain radiography. Vertebral height at the anterior location (VHa) and the difference in VHa {ΔVHa=VHa (supine position)−VHa (weight-bearing position)} were measured at baseline and 12 weeks after starting treatment. Bony union was defined as the absence of a vertebral cleft or abnormal motion (ΔVHa >2 mm). Results: Although not significant, ΔVHa, indicating vertebral stability, tended to be lower in the TPTD group at 12 weeks (p=0.17). As for subjects with severe osteoporosis, ΔVHa at 12 weeks was significantly lower in the TPTD group than in the control group (mean ΔVHa: control group, 3.1 mm (n=15); TPTD group, 1.4 mm (n=16); p=0.02). The rate of bony union was significantly higher in the TPTD group than in the control group (control group, 40%; TPTD group, 81%; p=0.03). Conclusions: Once-weekly TPTD administration may facilitate early bony union after acute OVF accompanied by severe osteoporosis.
Direct Pathway to Molecular Photodissociation on Metal Surfaces Using Visible Light
Kazuma, Emiko,Jung, Jaehoon,Ueba, Hiromu,Trenary, Michael,Kim, Yousoo American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.8
<P>We demonstrate molecular photodissociation on single-crystalline metal substrates, driven by visible-light irradiation. The visible-light-induced photodissociation on metal substrates has long been thought to never occur, either because visible-light energy is much smaller than the optical energy gap between the frontier electronic states of the molecule or because the molecular excited states have short lifetimes due to the strong hybridization between the adsorbate molecular orbitals (MOs) and metal substrate. The S-S bond in dimethyl disulfide adsorbed on both Cu(111) and Ag(111) surfaces was dissociated through direct electronic excitation from the HOMO-derived MO (the nonbonding lone-pair type orbitals on the S atoms (n(s)))to the LUMOderived MO (the antibonding orbital localized on the S-S bond (sigma*(ss))) by irradiation with visible light. A combination of scanning tunneling microscopy and density functional theory calculations revealed that visible-light-induced photodissociation becomes possible due to the interfacial electronic structures constructed by the hybridization between molecular orbitals and the metal substrate states. The molecule metal hybridization decreases the gap between the HOMO-and LUMO-derived MOs into the visible-light energy region and forms LUMO-derived MOs that have less overlap with the metal substrate, which results in longer excited-state lifetimes.</P>
AC/DC Converter Using Modular Matrix Converter for Quick Battery Charger
Kazuma Suzuki,Takaharu Takeshita 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The authors propose the isolated AC/DC converter using a modular matrix converter as a quick charger. This converter has a high-frequency transformer instead of a commercial-frequency transformer. The volume and weight of the proposed system become much smaller than those of the system using the commercial-frequency transformer. Because the proposed converter can directly charge the battery from the input medium voltage such as 6.6 kV, a pole transformer is not required and the system including the distribution system can be downsized. The operation principle and control method of the proposed converter are explained. The effectiveness of the proposed circuit was verified by using 200 V laboratory prototype.
Real-space and real-time observation of a plasmon-induced chemical reaction of a single molecule
Kazuma, Emiko,Jung, Jaehoon,Ueba, Hiromu,Trenary, Michael,Kim, Yousoo American Association for the Advancement of Scienc 2018 Science Vol.360 No.6388
<P>Plasmon-induced chemical reactions of molecules adsorbed on metal nanostructures are attracting increased attention for photocatalytic reactions. However, the mechanism remains controversial because of the difficulty of direct observation of the chemical reactions in the plasmonic field, which is strongly localized near the metal surface. We used a scanning tunneling microscope (STM) to achieve real-space and real-time observation of a plasmon-induced chemical reaction at the single-molecule level. A single dimethyl disulfide molecule on silver and copper surfaces was dissociated by the optically excited plasmon at the STM junction. The STM study combined with theoretical calculations shows that this plasmon-induced chemical reaction occurred by a direct intramolecular excitation mechanism.</P>
Mechanochromism of liquid crystalline cellulose derivative/synthetic polymer composites
Kazuma Miyagi,Yoshikuni Teramoto 강원대학교 산림과학연구소 2021 강원대학교 산림과학연구소 학술대회 Vol.2021 No.10
Mechanochromism is a stress-induced color change of materials and motivates smart applications such as stress-sensing, material damage-reporting, and information security. The principles to give mechanochromism include mechanophore, aggregation-induced emission, and structural colors. Cholesteric liquid crystal (ChLC) exhibits a structural color based on its selective reflection of circularly polarized light (CPL). Several cellulose derivatives are capable of expressing ChLC and can be a key component to produce mechanochromic materials. We have recently found that polymerized composites of ChLC solution of ethyl cellulose in acrylic acid demonstrated not only wide-ranging color change but also circular dichroic inversion upon mechanical stimulus at >120°C. Their original color and circular dichroism were recovered by post-thermal treatment. For propionylated hydroxypropyl cellulose, ChLC structure could be immobilized with various monomers, to which the contribution of hydrogen bonding and moderate compatibility was confirmed spectroscopically [Polymer 2019]. The extension of applicable monomers led to wide-ranging control of temperature and stress for mechanochromism expression. Most recently, we have succeeded in elucidating the effect of birefringence to the inversion of CPL handedness and simulating the mechanochromism. Cellulose-based ChLC is thus a promising material for smart mechanochromic material design.