Selected Projects
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Material Behavior and Mechanical Performance Based on Hierarchical Structure Formation of 3D-Printed Concrete
This study investigates the hierarchical structure of 3D-printed concrete (3DP concrete) by analyzing two key aspects: the microscopic heterogeneity caused by material segregation within the filament during deposition, and the macroscopic non-uniformity resulting from interfacial voids formed along the printing path. By clarifying these higher-order structures, we demonstrate that 3DP concrete possesses multiscale material properties and mechanical behavior, making it a hierarchical material. Furthermore, we establish a systematic academic framework for understanding how heterogeneity (material geometry) and non-uniformity (structural geometry) are embedded as geometric parameters in 3D spatial information, providing insights into the mechanical performance and failure modes of 3DP concrete.
Katsufumi Hashimoto, Takafumi Sugiyama, and Shimpei Ono
Grant-in-Aid for Scientific Research(B) 2025.4.1～2028.3.31
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Research and Development of Anomaly Detection Technology for Civil Infrastructures Using Electret Vibrational Energy Harvesting Device and Wireless Power/Data Transfer
We will develop a battery-less anomaly detection device capable of sensing the condition and environment of infrastructure structures, and establish a wireless energy and data communication platform. In particular, a system will be realized that allows monitoring via an IoT network using microwave spatial transmission (WPDT) technology of information related to structural deterioration, damage, environmental conditions, and faults autonomously detected by electret MEMS sensors powered by environmental vibration energy harvesting. This will enable the social implementation of a seamless monitoring platform targeting infrastructure structures and their auxiliary facilities, capable of phase-free response at all times, including both normal and emergency conditions.
Katsufumi Hashimoto (PI), Hiroyuki Mitsuya, and Teruo Fujiwara
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A study on the application of accelerated carbonation cement paste powder by wet-dry cycle technique to supplementary cementitious material
Carbonated recycled concrete paste can serve as a supplementary cementitious material (SCM) with pozzolanic properties from alumina-silica gel. Additionally, since it contains fine particles of calcium carbonate, it is expected to enhance concrete performance through its filling effect when used as SCM. Previous studies have shown that the wet-dry cycle method promotes CO₂ absorption and increases the porosity of concrete paste. Based on this, the study aims to efficiently absorb CO₂ using waste concrete paste through the wet-dry cycle method and seeks to recycle resources and enhance concrete performance by reusing the carbonation products as SCM.
Dayoung OH (researchmap.jp, researchgate.net, scholar.google.com), and Ryoma KITAGAKI
The Taisei Foundation 2025.4~2026.3
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Construction of an Energy Forecasting GIS and Development of Design Methods for Power Sharing Networks Utilizing Existing Buildings
Moving forward, Japan’s decarbonization must be driven by efforts that capitalize on the distinct characteristics of each region. Our research aims to develop a tool for predicting energy consumption in large building groups and evaluating the availability of renewable energy. In parallel, by proposing an optimized design methodology for power interchange networks that facilitates efficient electricity use, we will make it easier to formulate the best decarbonization plans tailored to specific regions.
Grant-in-Aid for Early-Career Scientists 2025.4.1～2028.3.31
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High-harmonic generation of by topological magnon edge states
Theoretical and experimental research on high harmonic generation originating from topological edge states of magnons is conducted.
Hideaki Obuse (researchmap.jp, scholar.google.de), and Hirori Hideki
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Collaboration on bulk-edge correspondence in gapless topological > phases
To significantly progress our joint research, we will invite a researcher from the Indian Institute of Technology Bombay to engage in 11 days of in-person discussion focused on bulk-edge correspondence and in gapless topological phase and effects of disorders. We also plan to discuss future application plans aimed at continuing collaborative research.
Hideaki Obuse (researchmap.jp, scholar.google.de), Soumya Bera, Ranjith R. Kumar, and Ishita Modak
JST Sakura Science Program (B course) 2025.8.21～2025.8.31
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Development of Ethical Mining Technologies to Achieve Responsible Mineral Sourcing: The Future of Mining Development Enabled by Blockchain
Assistant Professor Okada of Hokkaido University, with support from the JST Sakura Science Program, will invite eight faculty members and students from Aksum University in Ethiopia. Using blockchain and GIS, they will examine new technological frameworks for ensuring transparency in responsible mineral sourcing and for environmentally conscious resource development through joint research, practical exercises, and presentations of results.
Sakura Science Exchange Program 2026.2.4~2026.2.18
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Evaluation of Phosphorus Release from Lake Sediments Using Passive Sampling and Phosphate Oxygen Isotope Analysis
In eutrophic lakes, the persistent high phosphorus concentration in lake water poses a significant problem. This study employs passive sampling techniques and phosphorus oxygen isotope analysis to identify the sources supplying phosphorus to the lake water. This approach will also reveal contributions from lake sediments, which have not been evaluated previously. This research is expected to contribute to the assessment and conservation of lake water environments.
Akira Hafuka, Takuya Ishida, and Kazuto Sano
The Sumitomo Foundation, Grant for Environmental Research Projects 2025.11.01～2026.11.30
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Green Conversion of Palm Oil Wastes into Bio-Compressed Natural Gas (Bio-CNG) for Renewable Energy Diversification in Malaysia
This collaborative research aims to enhance the production and upgrading of bio-compressed natural gas (Bio-CNG) by effectively utilizing two major byproducts generated from Malaysia’s palm oil industry: palm oil mill effluent (POME) and empty fruit bunches (EFB). Specifically, the Japanese team will develop and support the operation of anaerobic digestion processes, conduct microbial community analyses, and apply machine-learning-based data-driven modelling to improve process stability and enable rapid and precise optimization of CO2 adsorbent performance. The Malaysian team will optimize pretreatment and fermentation conditions for EFB and lead the development and evaluation of gas separation technologies using EFB-derived biochar. Through collaborative research between the two countries, the project is expected to contribute to establishing a renewable energy technology platform that supports Malaysia’s transition toward a decarbonized energy society
Mamoru Oshiki, and Adeline Seak May CHUA
Networked Exchange, United Strength for Stronger Partnerships between Japan and ASEAN (NEXUS) 2026.1〜2028.12