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Journal of Structural and Construction Engineering 2023年第803期88卷 59-70页

作者： Anamizu, Ryosuke Kohiyama, Masayuki School of Science for Open and Environmental Systems Graduate School of Science and Technology Keio University Japan Dept. of System Design Engineering Faculty of Science and Technology Keio University Japan

To evaluate Q–Δ resonance, which is a torsional resonance phenomenon caused by geometric non-linearity, we proposed a simplified model for an n-story non-eccentric building model with a shear-type structure. We designed and fabricated a four-story small-scale specimen assuming a non-eccentric steel structure with a height of 324 m, and conducted shaking table tests. As a result, the occurrence of Q–Δ resonance was confirmed as predicted by the simplified model. In addition, the simplified model reproduced the resonance amplitude in a finite element model of the specimen with the out-of-plane rotation of slabs constrained and its validity was confirmed. © 2023 Authors. All rights reserved.

关键词： Tall buildings

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Speech Method for Caregiving Robots Considering Uncertainty 16th

Speech Method for Caregiving Robots Considering Uncertainty

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16th International Conference on Social Robotics, ICSR + AI 2024

作者： Shindo, Arisa Kawasaki, Yosuke Takahashi, Masaki School of Science for Open and Environmental Systems Graduate School of Science and Technology Keio University Kanagawa Japan Department of System Design Engineering Faculty of Science and Technology Keio University Kanagawa Japan

ISBN: (纸本)9789819635214

Recent studies have explored the integration of large language models (LLMs) into caregiving robots. The use of LLMs facilitates the generation of human-like natural dialogues and diverse, varied expressions. However, in case of a lack of direct and specific instructions from a user, gaining an accurate understanding of the user's intent is challenging, which may result in miscommunication. Thus, this study proposed a method to achieve robust communication even in the absence of direct instructions by considering the uncertainty in destination prediction probabilities. The proposed system leveraged GPT-4 to generate various Japanese speech content candidates and employed neighborhood components analysis to facilitate dimensionality reduction. Consequently, notable features of the rich linguistic embeddings were preserved while transforming them into manageable data. The system selected appropriate utterances based on the destination prediction probabilities. Furthermore, this study investigated changes in the speech content according to the variations in these probabilities, and the incorporation of uncertainty in communication was validated. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Dimensionality reduction

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Physiological and psychological effects of spotlight in a limited space

Physiological and psychological effects of spotlight in a li...

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AIAA science and technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Yoshino, Karin Takahashi, Masaki School of Science for Open and Environmental Systems Keio University Kanagawa Yokohama223-8522 Japan Faculty of Science and Technology Department of System Design Engineering Keio University Kanagawa Yokohama223-8522 Japan

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

In a limited space, such as pressurized rovers, insufficient personal space is a source of stress for astronauts. The aim of this study is to mitigate effects caused by personal space invasions. The proposed system for that problem is using a spotlight system that automatically adjusts based on vital sign feedback. In this study, experiments with human subjects to test the effects of spotlight exposure are conducted. Specifically, respiration signal was measured to investigate the relationship between respiration, distance and the spotlight in a limited space. The results suggest that changes in respiration may reflect the effects of spatial distance, suggesting that respiration may serve as an indicator of personal spatial discomfort. Furthermore, the usefulness of spotlight lighting in confined spaces was demonstrated through its effects on breathing, demonstrating its potential to enhance comfort by adjusting lighting based on vital sign. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Lighting

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Reducing children’s exposure to di(2-ethylhexyl)phthalate in homes and kindergartens in China:Impact on lifetime cancer risks and burden of disease

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Building Simulation 2024年第3期17卷 431-440页

作者： Dongsheng Tao Wen Sun Donghui Mo Yonghui Lin Wei Lv Daniel Mmereki Yousheng Xu Yanghui Ye Yuanjun Tang Chao Ye Cong Dong Zhongming Bu Zhejiang Ecowell Energy Management Technology Co. LtdHangzhouChina Department of Energy and Environmental System Engineering Zhejiang University of Science and TechnologyHangzhouChina Faculty of Health Sciences School of Clinical MedicineUniversity of the WitwatersrandParktown2193JohannesburgSouth Africa

Exposure to di(2-ethylhexyl)phthalate(DEHP)in the indoor environment has been linked with significant health risks for Chinese ***-phase DEHP concentrations in Chinese residences and kindergartens were estimated using a mass balance model based on the current baseline condition and control strategies(i.e.,increasing ventilation rate,reducing area of sources,using mechanical ventilation systems,and using portable air cleaners).The health benefits of each control strategy were quantified as the reduction in lifetime cancer risks(LCR)and burden of disease(BoD).In the current situation,the mean LCR and disability-adjusted life years(DALY)number attributable to indoor DEHP exposure for Chinese children were around 6.0×10^(−6) and 155 thousand,*** mean LCR and DALY might be reduced by 25%-54%and 16%-40%,respectively,by increasing air exchange rates by 100%,reducing the use of source materials by two-thirds or deploying commercial air cleaners in naturally ventilated ***,avoidable DALYs could result in a reduction of mean economic losses of 2.2-5.3 billion *** ventilation systems with filtration units may not be helpful for reducing children’s health ***-specific and tailor-made control measures are critical in lowering indoor exposure to DEHP to promote sustainable buildings and children’s health in China.

关键词： indoor air di(2-ethylhexyl)phthalate children exposure control strategies health benefits

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Quantifying carbon footprint of salmon fillet processed in Vietnam: impact of transportation and improvement opportunities

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environmental science and Pollution Research 2024年第42期31卷 54729-54737页

作者： Luong, Anh D. Cao, Son T. Doan, Thuy T. Pham, Duc T. Nguyen, Giang T. H. Tran, Ha P. Department of Environmental Management Faculty of Natural Resources and Environment Vietnam National University of Agriculture Hanoi Viet Nam Department of Resource and Environmental Information System Faculty of Natural Resources and Environment Vietnam National University of Agriculture Hanoi Viet Nam Department of Chemistry Faculty of Natural Resources and Environment Vietnam National University of Agriculture Hanoi Viet Nam Department of Environmental Management School of Environmental Science and Technology Hanoi University of Science and Technology Hanoi Viet Nam

The carbon footprint of a product represents the amount of greenhouse gas (GHG) emissions released during its production, transportation, and consumption and is calculated as carbon dioxide equivalent (CO2-eq). It should be integrated into different existing and future seafood awareness campaigns to create more holistic yardsticks by which consumers, retail businesses, and producers can assess the environmental impacts of seafood. This study used the life cycle assessment (LCA) method for the first time to quantify the carbon footprint of salmon fillet products processed in Vietnam for export. The carbon footprint of 1-kg salmon fillet at the factory gate ranges between 7.20 and 15.05 kg CO2-eq, depending on transportation modes of head-on-gutted (HOG) salmon from Norway to Vietnam. Transportatiton by airfreight doubled carbon footprint of salmon fillet products processed in Vietnam compared to sea freight. Feed and electricity were identified as the two most respective contributing factors during the stage of cultivation, processing fresh salmon in Norway, and the stage of salmon fillet processing in Vietnam. They accounted for about 95% and 50% of the total carbon footprint in these stages of the production chain, respectively. To reduce the carbon footprint of the salmon fillet products processed in Vietnam, the company should (i) make a careful production plan to use sea freight transportation instead of airfreight and (ii) use more electricity from renewable energy sources. Furthermore, the carbon footprint of these products can be reduced by improving the cultivation process via changing feed ingredients and enhancing the feed conversion ratio (FCR). © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Carbon footprint

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The impact of human-induced turbulence on indoor thermal environment and pollutant diffusion

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建筑模拟（英文版） 2025年第3期18卷 473-497页

作者： Yu Zhao Chang Xiong Zhiwen Luo Tareq Hussein Tianyi Zhao School of Infrastructure Engineering Dalian University of TechnologyDalian 11600China Welsh School of Architecture Cardiff UniversityCardiffCF10 3ATUK Institute of Atmospheric and Earth System Research(INAR/Physics) Faculty of ScienceUniversity of HelsinkiHelsinkiFI-0014 UHELFinland Environmental and Atmospheric Research Laboratory(EARL) Department of PhysicsSchool of ScienceUniversity of JordanAmman11942Jordan

Turbulence induced by human movement is thought to affect the dispersion of pollutants in indoor *** this study,eight classical crowd scenarios were numerically simulated to investigate the effects of human movement on indoor air pollution in different ***-level simulations were performed into human movement,respiration,and heat dissipation,and differential analyses of the simulation results for different flow scenarios were conducted to investigate the interactions between *** has shown that people walking create significant wake currents within approximately 1.1 m on either side of their path and within 3-4 m behind *** two pedestrians crossed paths,the wind speed increased significantly to 1.87 m/s compared with a single person walking at 1 m/*** greatest mutual interference in pollutant distribution occurs when two individual cross paths are perpendicular,with a critical interference distance threshold of 2.87 *** dioxide concentrations fluctuate,surpassing 1,000 ppm within ten minutes at a density of 1.52 persons per square ***,the dispersion of aerosol particles is significantly influenced by the relative direction of movement between individuals and pollutant ***"safe distance"to avoid inhalation of exhaled aerosols in short flow exposure scenarios is at least 3.4 *** personnel wake disturbance intensity was defined based on the rate of change in the velocity amplitude in the personnel wake region,the wake deformation rate,and the dissipation *** insights can guide improvements in indoor air quality and health risk reduction in densely populated spaces.

关键词： human-induced turbulence wind-heat environment carbon dioxide aerosol particles computational fluid dynamics(CFD) pollutant dispersion

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The global mismatch between equitable carbon dioxide removal liability and capacity

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National science Review 2023年第12期10卷 111-123页

作者： Pu Yang Zhifu Mi Yi-Ming Wei Steef V.Hanssen Lan-Cui Liu D'Maris Coffman Xinlu Sun Hua Liao Yun-Fei Yao Jia-Ning Kang Peng-Tao Wang Steven J.Davis The Bartlett School of Sustainable Construction University College London Energy and Power Group University of Oxford Exeter Sustainable Finance Centre University of Exeter Center for Energy and Environmental Policy Research Beijing Institute of Technology School of Management and Economics Beijing Institute of Technology Department of Environmental Science Faculty of Science Radboud University Business School Beijing Normal University Strategy Plan Department Sinopec Research Institute of Petroleum Engineering Department of Earth System Science University of California

Limiting climate change to 1.5℃ and achieving net-zero emissions would entail substantial carbon dioxide removal（CDR） from the atmosphere by the mid-century,but how much CDR is needed at country level over time is *** purpose of this paper is to provide a detailed description of when and how much CDR is required at country level in order to achieve 1.5℃ and how much CDR countries can carry out *** allocate global CDR pathways among 170 countries according to 6 equity principles and assess these allocations with respect to countries' biophysical and geophysical capacity to deploy *** global CDR to countries based on these principles suggests that CDR will,on average,represent～4% of nations' total emissions in 2030,rising to ～17% in ***,equitable allocations of CDR,in many cases,exceed implied land and carbon storage *** estimate～15 % of countries（25）would have insufficient land to contribute an equitable share of global CDR,and ～40% of countries（71）would have insufficient geological storage *** more diverse CDR technologies are developed,the mismatch between CDR liabilities and land-based CDR capacities will lead to global demand for six GtCO2carbon credits from 2020 to *** demonstrates an imperative demand for international carbon trading of CDR.

关键词： carbon dioxide removal land-based solutions international equity

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Release of space debris from flexible nets for Active Debris Removal

Release of space debris from flexible nets for Active Debris...

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AIAA science and technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Ota, Ko Takahashi, Masaki Keio University School of Science for Open and Environmental Systems 3-14-1 Hiyoshi Kohoku-ku Kanagawa Yokohama223-8522 Japan Faculty of Science and Technology Keio University Department of System Design Engineering 3-14-1 Hiyoshi Kohoku ku Kanagawa Yokohama223-8522 Japan

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Net-based debris capture is one of the countermeasures against space debris. This paper considers the system which consists of flexible net with actuators attached to the corner nodes to release multiple debris into transitioned orbit. The debris releasing from a net system is assumed, and the net-debris composite system is attributed to nonlinear programming. The nonlinear dynamics of net’s flexibility and contact between the net and the debris are explicitly considered so that the debris can realize the target speed and angle of velocity, and the optimized control input history of the net system actuators is derived accordingly. The validity of derived actuator inputs is verified by numerical simulations. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Nonlinear programming

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THREE-DIMENSIONAL FRAME ANALYSIS OF Q-? RESONANCE OF CENTER-CORE BIAXIALLY SYMMETRICAL HIGH-RISE BUILDING UNDER LONG-PERIOD EARTHQUAKE MOTION 9

THREE-DIMENSIONAL FRAME ANALYSIS OF Q-? RESONANCE OF CENTER-...

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9th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2023

作者： Kohiyama, Masayuki Maki, Shiori Department of System Design Engineering Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan School of Science for Open and Environmental Systems Graduate School of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan

When large displacements occur in buildings with different stiffnesses in the two horizontal directions, torsional moments are generated owing to geometric nonlinearities. Consequently, when the sum or difference of the translational mode natural frequencies in the two horizontal directions is close to the torsional mode natural frequency, the torsional mode is excited. This is known as Q-? resonance. Therefore, we created a three-dimensional frame model of a center-core high-rise building with a biaxially symmetrical plane that satisfied the Q-? resonance condition and examined whether the torsional response was excited by long-period design waves. A time-history response analysis was conducted assuming elastic response and considering geometric nonlinearities. It was confirmed that the torsional mode could be induced. © 2023 COMPDYN Proceedings. All rights reserved

关键词： Natural frequencies

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EXPERIMENT AND SIMULATION OF Q-? RESONANCE USING FOUR-LAYER BENDING-SHEAR TYPE SPECIMEN 9

EXPERIMENT AND SIMULATION OF Q-? RESONANCE USING FOUR-LAYER ...

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9th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2023

作者： Kai, Ryohei Kohiyama, Masayuki School of Science for Open and Environmental Systems Graduate School of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan Department of System Design Engineering Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan

Torsional vibration of buildings subjected to earthquake motion has been studied for many years, but the torsional vibration of high-rise buildings has not yet been clarified. Many previous studies have focused on eccentricity, the mismatch between the center of gravity and the rigid center, as the cause of torsional vibration. However, in buildings with no eccentricity, torsional vibrations could be observed. The authors' research group focused on the "Q-? effect," a phenomenon in which torsional torque is generated due to geometric nonlinearity and "Q-? resonance," a phenomenon in which resonance occurs when the period of torsional torque generation coincides with the natural period of the torsional mode. In order to analyze the characteristics of Q-? resonance, a small-scale specimen was designed and fabricated from an 81-story high-rise building with biaxially symmetrical plans, which was reduced to four stories. As a result, the torsional response of the experimental and simulation results generally agreed, confirming that the torsional response increases when the Q-? resonance condition is satisfied. In addition, a comparison of the torsional response with a specimen with a smaller tower ratio and less bending deformation was conducted, and it was confirmed that the peak of the torsional response was steeper in the present study case. © 2023 COMPDYN Proceedings. All rights reserved

关键词： Finite element method

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