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A 1-GHz, 7-mW, 8-Bit Subranging ADC without Resistor Ladder Using Built-In Threshold Calibration

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Circuits and Systems 2014年第4期5卷 76-88页

作者： kenichi ohhata Wataru Yoshimura Daiki Tabira Futoshi Shimozono Masataro Iwamoto Department of Electrical and Electronics Engineering Graduate School of Science and Engineering Kagoshima University Kagoshima Japan

A subranging analog-to-digital converter (ADC) features high-speed and relatively low-power. The limiting factors of power reduction in subranging ADCs are the resistor ladder and the comparator. We propose an ADC architecture combining a capacitive digital-to-analog convertor and built-in threshold calibration to eliminate the resistor ladder, resulting in a low-power subranging ADC. We also propose a calibration technique comprising of metal-oxide-metal capacitor, MOS switch, and scaling capacitor to reduce the power consumption of the comparator and an offset drift compensation technique to enable precise foreground calibration. We designed an 8-bit, 1-GHz subranging ADC by applying these techniques, and post-layout simulation results demonstrated a power consumption of 7 mW and figure of merit of 51 fJ/conv.-step.

关键词： Analog-to-Digital Convertor Subranging Architecture Resistor Ladder Foreground Calibration Offset Drift

A 500-MS/s, 2.0-mW, 8-Bit Subranging ADC with Time-Domain Quantizer

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Circuits and Systems 2017年第1期8卷 1-13页

作者： kenichi ohhata Kaihei Hotta Naoto Yamaguchi Daiki Hayakawa Kenji Sewaki Kento Imayanagida Yuuki Sonoda Department of Electrical and Electronics Engineering Graduate School of Science and Engineering Kagoshima University Kagoshima Japan

This paper describes a novel energy-efficient, high-speed ADC architecture combining a flash ADC and a TDC. A high conversion rate can be obtained owing to the flash coarse ADC, and low-power dissipation can be attained using the TDC as a fine ADC. Moreover, a capacitive coupled ramp circuit is proposed to achieve high linearity. A test chip was fabricated using 65-nm digital CMOS technology. The test chip demonstrated a high sampling frequency of 500 MHz and a low-power dissipation of 2.0 mW, resulting in a low FOM of 32 fJ/conversion-step.

关键词： Time-Based ADC Flash ADC TDC VTC CMOS

Mission of the National Cancer Center Hospital in Japan to promote clinical trials for precision medicine

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Cancer Biology & Medicine 2024年第1期21卷 1-3页

作者： Kazuaki Shimada kenichi Nakamura Noboru Yamamoto Department of Hepatobiliary and Pancreatic Surgery National Cancer Center HospitalTokyo 104-0045Japan Clinical Research Support Offce National Cancer Center HospitalTokyo 104-0045Japan Department of Experimental Therapeutics National Cancer Center HospitalTokyo 104-0045Japan

Precision medicine is a growing field *** its potential benefit to many patients,several major obstacles must be overcome before precision medicine can be more widely used in clinical *** main obstacles are associated... 详细信息

关键词： clinical Cancer overcome

Development of Self-Rated Nursing Record Frequency for Delirium Care of Nurses in Acute Care Hospitals (NRDC-Acute)

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Open Journal of Nursing 2024年第8期14卷 412-420页

作者： Katsuhiko Hattori kenichi Matsuda Department of Nursing Teikyo Heisei University Tokyo Japan

Background: Nursing records play an important role in multidisciplinary collaborations in delirium care. This study aims to develop a self-rated nursing record frequency scale for delirium care among nurses in acute care hospitals (NRDC-Acute). Methods: A draft of the scale was developed after a literature review and meeting with researchers with experience in delirium care, and a master’s or doctoral degree in nursing. We identified 25 items on a 5-point Likert scale. Subsequently, an anonymous self-administered questionnaire survey was administered to 520 nurses from 41 acute care hospitals in Japan, and the reliability and validity of the scale were examined. Results: There were 232 (44.6%) respondents and 218 (41.9%) valid responses. The mean duration of clinical experience was 15.2 years (SD = 8.8). Exploratory factor analysis extracted 4 factors and 13 items for this scale. The model fit indices were GFI = 0.991, AGFI = 0.986, and SRMR = 0.046. The Cronbach’s alpha coefficient for the entire scale was .888. The four factors were named “Record of Pharmacological Delirium Care on Pro Re Nata (PRN)”, “Record of Non-Pharmacological Delirium Care”, “Record of Pharmacological Delirium Care on Regular Medication”, and “Record of Collaboration for Delirium Care”. Conclusion: The scale was relatively reliable and valid. Nurses in acute care hospitals can use this scale to identify and address issues related to the documentation of nursing records for delirium care.

关键词： Acute Care Hospitals Delirium Care Nurses Nursing Records Scale Development

Highly-efficient VCSEL breaking the limit

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Light(Science & Applications) 2024年第6期13卷 1021-1021页

作者： Dieter Bimberg Fumio Koyama kenichi Iga TU Berlin Hardenbergstr.3610623BerlinGermany Bimberg Chinese-German Center for Green Photonics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesNo.3888 Dong Nan Hu RoadChangchun130033China Tokyo Institute of Technology Nagatsuta 4259Midori-kuYokohama226-8501Japan

VCSELs have become indispensable in the realms of datacenter networks and three-dimensional sensing thanks to their high-energy efficiencies,low-cost and the scalability of their two-dimensional *** boast high energy-efficiency,exceeding 50%at low bias currents,superiority over edge-emitting lasers,particularly for optical interconnects within datacenter ***,there has been no breakthroughs in the efficiency of VCSELs for over a decade.

关键词： limit breakthrough Highly

SPERA Hydrogen System^(TM)by LOHC-MCH Method for Massive Hydrogen Storage and Transportation

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Journal of Environmental Science and Engineering(A) 2024年第2期13卷 50-60页

作者： Yoshimi Okada Kaji Naohiro Osamu Ikeda kenichi Imagawa Hironori Kawai Masashi Nagai Yasuhiro Inoue Frontier Business Division Chiyoda Corporation4-6-2 Minatomirai Nishi-kuYokohama 2208765Japan Hydrogen Business Department Chiyoda Corporation4-6-2 Minatomirai Nishi-kuYokohama 2208765Japan R&D Center Chiyoda Corporation3-13 Moriya-cho Kanagawa-kuYokohama 2208765Japan Technology Development Department Chiyoda Corporation4-6-2 Minatomirai Nishi-kuYokohama 2208765Japan

Expanding the hydrogen energy utilization is essential for decarbonization,and the commercialization of hydrogen energy carrier systems that can“store”and“transport”hydrogen in a large scale is *** organic chemical hydride method incorporates hydrogen atoms into the molecular structure of a LOHC(Liquid Organic Hydrogen Carrier)to store and transport hydrogen in a liquid state under normal temperature and pressure,and is a highly safe method with low business *** has been developing the technology since 2002,completed a pilot demonstration in 2014 and named it the SPERA Hydrogen^(TM) System,and successfully completed an international supply chain demonstration that transports hydrogen from Brunei to Japan in a large scale in 2020,moving to the commercialization ***,Chiyoda is conducting feasibility studies with a number of domestic and foreign companies with the aim of commercializing the system as soon as *** this paper,outline,features,development status and our efforts in commercialization of SPERA HydrogenTM System are introduced.

关键词： Hydrogen carrier LOHC Methylcyclohexane MCH toluene

Genomic medicine in clinical practice:national genomic medicine program in Japan

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Cancer Biology & Medicine 2024年第1期21卷 4-9页

作者： Teruhiko Yoshida Yasushi Yatabe Ken Kato Genichiro Ishii Akinobu Hamada Hiroyuki Mano Kuniko Sunami Noboru Yamamoto Takashi Kohno Department of Genetic Medicine and Services National Cancer Center HospitalTokyo 104-0045Japan Department of Diagnostic Pathology National Cancer Center HospitalTokyo 104-0045Japan Clinical Research Support Offce Clinical Research Coordinating SectionBiobank Translational Research Support SectionNational Cancer Center HospitalTokyo 104-0045Japan Department of Pathology and Clinical Laboratories National Cancer Center Hospital EastChiba 277-8577Japan Division of Molecular Pharmacology National Cancer Center Research InstituteTokyo 104-0045Japan National Cancer Center Research Institute Tokyo 104-0045Japan Department of Laboratory Medicine National Cancer Center HospitalTokyo 104-0045Japan Department of Experimental Therapeutics National Cancer Center HospitalTokyo 104-0045Japan Division of Genome Biology National Cancer Center Research InstituteTokyo 104-0045Japan

Cancer statistics in Japan Cancer is the most common cause of death in Japan based on Statistics 2021~*** statistics were first gathered,infectious diseases,such as tuberculosis,and cerebrovascular disease have been the main causes of death in *** surpassed cerebrovascular disease as the main cause of death in 1981,and the number of cancer deaths has *** 38,000 people died of cancer in *** National Cancer Center(NCC)reported that the 5-year survival rate for patients with cancer was improving(62%for males and 66.9%for females)in a population-based cancer registry.

关键词： Cancer cancer death

Comparison of two projection methods for modeling incompressible flows in MPM

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Journal of Hydrodynamics 2017年第3期29卷 405-412页

作者： Shyamini Kularathna kenichi Soga Department of Engineering Geotechnical and Environmental Research GroupUniversity of Cambridge Department of Civil and Environmental Engineering University of California Berkeley

Material point method（MPM）was originally introduced for large deformation problems in solid mechanics ***,it has been successfully applied to solve a wide range of material ***,previous research has indicated that MPM exhibits numerical instabilities when resolving incompressible flow *** study Chorin＇s projection method in MPM algorithm to simulate material *** projection-type schemes,non-incremental projection and incremental projection,are investigated for their accuracy and stability within *** examples show that the non-incremental projection scheme provides stable results in single phase MPM ***,it avoids artificial pressure oscillations and small time steps that are present in the explicit MPM approach.

关键词： Chorin's projection method material point method(MPM) incompressible flow time step

Switch mode capacitive pressure sensors

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Microsystems & Nanoengineering 2022年第6期8卷 47-60页

作者： Nabil Shalabi Kyle Searles kenichi Takahata Department of Electrical and Computer Engineering University of British ColumbiaVancouverBC V6T 1Z4Canada School of Biomedical Engineering University of British ColumbiaVancouverBC V6T 1Z3Canada

Switch mode capacitive pressure sensors are proposed as a new class of microfabricated devices that transform pressure into a mechanically switching capacitance to form an analog-to-digital signal with zero power,high sensitivity,and a high signal-to-noise ratio.A pressure-sensitive gold membrane suspended over a capacitive cavity makes ohmic contact with patterned gold leads on the substrate,closing circuits to fixed on-chip capacitors outside the cavity and leading to significant step *** function is achieved by allocating the switch leads on the part of the counter electrode area,while the remaining area is used for touch mode analog capacitive *** sensor microchip is prototyped through a novel design approach to surface micromachining that integrates micro-Tesla valves for vacuum sealing the sensor cavity,showing an unprecedented response to applied *** a gauge pressure range of 0–120 mmHg,the sensor exhibits an increase of 13.21 pF with resultant switch events,each of which ranges from 2.53–3.96 pF every 12–38 mmHg,in addition to the touch mode linear capacitive increase between *** equivalent sensitivity is 80–240 fF/mmHg,which is 11–600×more than commercial and reported touch mode sensors operating in similar pressure *** sensor is further demonstrated for wireless pressure tracking by creating a resonant tank with the sensor,showing a 32.5–101.6 kHz/mmHg sensitivity with frequency jumps led by the switch *** developed sensor,with its promising performance,offers new application opportunities in a variety of device areas,including health care,robotics,industrial control,and environmental monitoring.

关键词： mode cavity sealing