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CHAPTER 9

Papers, Patents and Funding

PAPR for Everyone

  1. A Helmet Type Mask "Distancing-Free Mask": An Engineering Solution that Eliminates the Lockdown
    Y. Fujii, A. Takita, S. Hashimoto — Journal of Mechanical and Electrical Intelligent System, Vol.3, No.3, pp.1–7, 2020. https://jmeis.e-jikei.org/issue/archives/vol03_no03/F001/Camera_ready_manuscript_JMEIS_F001_535362_final.pdf　[concept and engineering starting point] → Chapter 3
  2. An Engineering Alternative to Lockdown During COVID-19 and Other Airborne Infectious Disease Pandemics: Feasibility Study
    Y. Fujii — JMIR Biomedical Engineering, Vol.9, e54666, 2024. https://doi.org/10.2196/54666　[feasibility] → Chapter 3
  3. Examination of the requirements for powered air-purifying respirator (PAPR) utilization as an alternative to lockdown
    Y. Fujii — Scientific Reports, Vol.15, 1217, 2025. https://doi.org/10.1038/s41598-024-82348-0　[population-level requirements] → Chapter 3
  4. Estimation of Respiratory States Based on a Measurement Model of Airflow Characteristics in PAPR Using Differential Pressure and PWM Control Signals: In the Development of a Public-Oriented PAPR as an Alternative to Lockdown Measures
    Y. Fujii, A. Takita, S. Hashimoto, K. Amagai — Sensors, Vol.25, No.9, 2939, 2025. https://doi.org/10.3390/s25092939　[respiratory-state estimation] → Chapter 4
  5. The Real-Time Estimation of Respiratory Flow and Mask Leakage in a PAPR Using a Single Differential-Pressure Sensor and Microcontroller-Based Smartphone Interface in the Development of a Public-Oriented Powered Air-Purifying Respirator as an Alternative to Lockdown Measures
    Y. Fujii — Sensors, Vol.25, No.17, 5340, 2025. https://doi.org/10.3390/s25175340　[real-time flow and leak estimation] → Chapter 4
  6. Time-managed PAPR use enables a balanced approach to infection control and personal freedom
    Y. Fujii — Scientific Reports, Vol.16, 2878, 2026. https://doi.org/10.1038/s41598-025-32625-3　[time-managed use] → Chapter 5
  7. Reframing Pandemic Preparedness: Why Positive-Pressure Exposure Control Merits Formal Public Health Evaluation
    Y. Fujii — JMIR Public Health and Surveillance, Vol.12, e90211, 2026. https://doi.org/10.2196/90211　[proposal for formal public health evaluation] → Chapter 6
  8. Y. Fujii, "Research project: a socio-technical system using powered air-purifying respirators as an alternative to lockdown (first report)", Japanese Journal of Social Safety and Privacy, Vol.9, No.1, pp.1–17, 2025 (Japanese). PDF　[research plan] → Chapter 5

Privacy-preserving measurement infrastructure

  1. From Measurement Failure to Privacy Infrastructure: Reframing Contact Tracing Governance for the Next Pandemic
    Y. Fujii — Journal of Medical Internet Research, Vol.28, e99645, 2026. https://doi.org/10.2196/99645　[measurement failure and privacy infrastructure] → Chapter 7
  2. Y. Fujii, "Verifiable record of AI output for privacy protection: public space watched by AI-connected cameras as a target example", AI & Society, Vol.40, pp.3697–3706, 2025. https://doi.org/10.1007/s00146-024-02122-8　[VRAIO]
  3. Y. Fujii, "Governing AI Output in Autonomous Driving: Scalable Privacy Infrastructure for Societal Acceptance", Future Transportation, Vol.5, No.3, 116, 2025.　[VRAIO]

Other publications: http://www.e-jikei.org/fujii/fujii.htm

Related patents (PAPR, Japan)

PatentTitle (translated)InventorsGranted
No. 7515044Method and system for managing mask-wearing status and contact with othersY. Fujii, S. Hashimoto, A. Takita4 July 2024
No. 7616624Helmet-type mask with forced intake and exhaustY. Fujii, S. Hashimoto, T. Yamaguchi, A. Takita8 January 2025
No. 7653735Breathing-air purification deviceY. Fujii, S. Hashimoto, A. Takita21 March 2025

Funding

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Contents

Measures for the Next Pandemic: engineering and social infrastructure for controlling infection without stopping society | Yusaku Fujii (Gunma University)
This site presents research-stage work; figures are model calculations or prototype measurements.