理工学部 教員紹介
Profile Information
- Affiliation
- Assistant Professor, Faculty of Science and Technology Department of Science and Technology , Seikei University
- Degree
- 博士（工学）
- J-GLOBAL ID
- 201801006443704147
- researchmap Member ID
- 7000025465
Research Interests
1Research History
8-
Apr, 2019 - Present
Awards
24Papers
51-
Arts & Communication, 2(2) 1782-1782, May 6, 2024 Peer-reviewedDespite the existing research on flow in music education, there remains a lack of researches in understanding children’s flow experiences in the context of playing musical instrument, electronic technological instruments, and other traditional instruments. This study investigates the observable flow experience among young children during their interactions with musical instrument digital interface instruments, violins, and bell-like instruments. The research employed a case study approach, with 20 children aged two to nine (11 females and nine males) participating in the study. In the study, we, as practitioner-researchers, offered workshops for children to experience a variety of traditional and non-traditional musical instruments. Throughout the study, researchers collected 89 video clips for analysis, using four cameras operated by four assistants who were trained to capture children’s flow in a musical context. These monthly sessions, each lasting an average of 60 min, began with the first session dedicated to capturing the very first encounter of children with various musical devices, instruments, and materials. Custodero’s Flow Indicators in Musical Activities captured children’s flow experiences during workshops. The findings included interpretations of the children’s flow experiences as they explored different devices, instruments, and materials, with a particular emphasis on accessibility and developmental considerations within the social context of children’s musical flow.
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Journal of Alloys and Compounds, 174667-174667, May, 2024 Peer-reviewed
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Materials Transactions, 64(8) 1784-1790, Jul, 2023 Peer-reviewedLead authorCorresponding authorTi6Al7Nb alloys have been widely used in the medical field, particularly in artificial hip joints, spinal fixators, and dental implants, owing to their light weight, low toxicity, and superior corrosion resistance. Grain refinement through a severe plastic deformation process under high pressure, such as high-pressure torsion (HPT) or high-pressure sliding, is widely employed for strengthening metallic materials. This overview presents the recent advances in the effect of HPT on the mechanical properties of the Ti6Al7Nb alloy. This alloy was grain-refined through HPT under applied pressures of 2 and 6 GPa, and the results revealed that the alloy subjected to HPT processing at 6 GPa exhibited a higher strength. To inhibit the decrease in the total elongation of the alloy, the number of revolutions in the HPT process was set to moderate. The tensile properties achieved after HPT processing were found to be dependent on the initial microstructure before the HPT treatment. Furthermore, an alloy with a bimodal equiaxed and acicular structure was subjected to grain refinement via the HPT process. The results revealed that fragmentation of the acicular structure during HPT further increased the strength. Moreover, the HPT-processed Ti6Al7Nb alloy exhibited superplasticity. It was thus confirmed that grain refinement by HPT is an effective method for strengthening the Ti6Al7Nb alloy, which is advantageous for medical applications.
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COATINGS, 13(3) 627, Mar, 2023 Peer-reviewedA customized micro-arc oxidation (MAO) treatment technique was developed to obtain antibacterial properties with no toxicity on Ti surfaces. A two-step MAO treatment was used to fabricate a specimen containing both Ag and Zn in its surface oxide layer, and the optimal incorporation conditions were determined. Surface characterization by EDS was performed followed by the antibacterial properties against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) and osteogenic cell compatibility evaluations. In addition, metal ion release tests were performed to evaluate the contents of Ag and Zn and the ion release behavior in order to simulate practical usage. MAO-treated specimens prepared using proper concentrations of Ag and Zn (0.5Ag-5Zn: 0.5 mM AgNO3 and 5.0 mM ZnCl, respectively) exhibited excellent antibacterial properties against E. coli and S. aureus and no toxicity to MC3T3-E1 in antibacterial and cytotoxic evaluations, respectively. The antibacterial property of 0.5Ag-5Zn against S. aureus was sustained even after two months of immersion in physiological saline, simulating the in vivo environment.
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MATERIALS TRANSACTIONS, 64(1) 131-137, Jan, 2023 Peer-reviewedIn orthopedics, occasionally, different types of metals are used in applications in which they are in contact with each other. However, few studies have electrochemically investigated the galvanic corrosion of orthopedic implants formed of different metals. In this study, galvanic corrosion of Ti-6Al-4V ELI alloy, Co-Cr-Mo alloy, and 316L type stainless steel, which are used in orthopedics, and a newly developed Zr-1Mo alloy as a low-magnetic susceptibility material was evaluated in saline. Coupling of the Ti-6Al-4V ELI and Co-Cr-Mo alloys did not exhibit localized corrosion and maintained highly stable passive films. Coupling of the 316L type stainless steel and Co-Cr-Mo alloy, temporary localized corrosion occurred. Similarly, coupling of the Zr-1Mo and Co-Cr-Mo alloys, temporary localized corrosion occurred. However, both of 316L type stainless steel and Zr-1Mo alloy were finally repassivated spontaneously with the immersion time. The degree of the localized corrosion of the Zr-1Mo alloy was smaller than that of 316L type stainless steel. No galvanic current was observed when the Ti-6Al-4V ELI and Co-Cr-Mo alloys were coupled. A slight galvanic current flowed when 316L type stainless steel or the Zr-1Mo alloy was coupled with the other alloys; however, the galvanic current with the Zr-1Mo alloy coupling recovered to zero after a certain period owing to repassivation. No metal ions were detected from the couplings with Zr-1Mo
Misc.
5-
Materia Japan, 59(12) 679-684, Dec 1, 2020 Peer-reviewed
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Transactions of the Annual Meeting of the Society for Biomaterials and the Annual International Biomaterials Symposium, 40 355, 2019Introduction: The next generation surface modification on medical and dental implants is coatings of tissue or stem cells on them.1 To promote cellular attachment and formation of tissues on materials, the control of patterned surface topography is necessary, as the surface topography of a material governs its biocompatibility. For example, in the case of titanium (Ti), nanometer scale topographical features influence cell spreading and micrometer scale topography promotes stem cell differentiation in vitro.2-4 To clarify the role of patterned nano topographies on the biocompatibility and osteoconductivity of metal implant, we investigated the adhesion and calcification of mouse preosteoblast (MC3T3-E1) to Ti surfaces with three surface patterned nano-ripples topography fabricated by single-shot femtosecond laser irradiation.
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The journal of the Japanese Society for Dental Materials and Devices, 34(2) 121-121, Mar 25, 2015Micro-arc oxidation (MAO) was performed on a titanium (Ti) to achieve both hard-tissue compatibility and antibacterial property. The surface oxide layer formed on Ti by MAO treatment in a mixture of calcium glycerophosphate, calcium acetate, and silver nitrate was evaluated by surface analyses, cell and microbial testing. Small amount of Ag was incorporated into the porous oxide layer by MAO treatment. Ag-ion release was confirmed during immersion in a physiological saline. The released Ag ions completely inhibit the proliferation of E. coli while the proliferation and mineralization activity of MC3T3-E1 cells was not affected when MAO treatment condition was optimized.
Presentations
20-
International Workshop on Superfunctional Energy/Nano Materials (SENM2023), Aug 31, 2023
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The 7th International Symposium on Biomedical Engineering (ISBE2022), Nov 25, 2022
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The 7th Joint Symposium between IBB/TMDU and Chulalongkorn University, Dec 22, 2020 Invited
Teaching Experience
7Research Projects
9-
科学研究費助成事業 若手研究, 文部科学省/日本学術振興会, Apr, 2021 - Mar, 2025
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生体医歯工学共同研究拠点, May, 2022 - Mar, 2023
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Apr, 2020 - Mar, 2023
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生体医歯工学共同研究拠点, May, 2020 - Mar, 2022
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文部科学省/日本学術振興会, 2019 - 2022
Industrial Property Rights
2
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