IEEJ Transactions on Sensors and Micromachines
Online ISSN : 1347-5525
Print ISSN : 1341-8939
ISSN-L : 1341-8939
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Volume 134, Issue 5
Displaying 1-10 of 10 articles from this issue
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Special Issue on “Selected papers in The Technical Meetings on Sensors and Micromachines 2013”
Preface
Special Issue Paper
  • Development of Ca2+-driven Microvalve Powered by Contractile Fiber of Vorticella
    Moeto Nagai, Kohei Tanizaki, Takahiro Kawashima, Takayuki Shibata
    2014 Volume 134 Issue 5 Pages 101-107
    Published: 2014
    Released on J-STAGE: May 01, 2014
    DOIhttps://doi.org/10.1541/ieejsmas.134.101
    JOURNAL FREE ACCESS
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    Bioactuators, biological motors in living systems are promising for integration and functionalization of microsystems. We have developed a Ca2+-driven microvalve powered by a contractile fiber, a stalk of Vorticella. Cells of Vorticella convallaria were trapped in designed microchambers. Stalks were self-grown in the chambers and their reversible linear actuations were controlled by regulating the concentration of Ca2+. A cell body, connected to a stalk, opened and closed a microchannel by the contraction and extension of the stalk. A flow field in the chamber was characterized to further optimize the actuation performance.
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  • Low Power ECG Processing ASIC
    Yuki Matsumoto, Tomoya Tanaka, Koji Sonoda, Kensuke Kanda, Takayuki Fu ...
    2014 Volume 134 Issue 5 Pages 108-113
    Published: 2014
    Released on J-STAGE: May 01, 2014
    DOIhttps://doi.org/10.1541/ieejsmas.134.108
    JOURNAL FREE ACCESS
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    We designed and evaluated ASICs (Application Specific Integrated Circuits) for the human activity monitoring systems to reduce the total power consumption. The ASIC extracts the heart rate from measured ECG (Electrocardiogram) raw signal. To realize the ASIC with ultra-low power consumption, we used novel algorithm based on fuzzy logic which is very simple and light processing. The fabricated ASIC shows sufficient function and low power as low as 2 µW.85% of the power consumption for MPU (Micro-Processing Unit) processing was cut by using the heart rate extraction ASIC.
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  • Drop-on-demand Patterning of Microtubules by using a Needle Type Micro Dispenser
    Oya Koc, Mehmet Cagatay Tarhan, Yoshiyuki Kato, Hiroyuki Fujita, Beomj ...
    2014 Volume 134 Issue 5 Pages 114-118
    Published: 2014
    Released on J-STAGE: May 01, 2014
    DOIhttps://doi.org/10.1541/ieejsmas.134.114
    JOURNAL FREE ACCESS
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    To detect disease biomarkers in molecular level in an on-chip format, a precise patterning of functional biomolecule is crucial step of building diagnostic devices. Here, we aim at integrating a microtubule-based fluidic device to detect early state of Alzheimer's disease. Temperature or pressure-sensitive, fragile microtubule can easily depolymerize, so that it cannot be easily patterned with conventional methods, such as inkjet printing, micro contact printing, etc. For this purpose, we performed direct patterning of microtubules in 100-so tiameter by using a needle-type dispenser on fluidic device and their functionality with Kinesin motion was successfully confirmed. Overall, our results indicate that the needle type micro dispenser may pattern even fragile biomaterials in micro scale, and integrated fluidic device is promising for detecting tau protein, which is a biomarker of neurodegenerative diseases.
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  • Sensitivity Modification of Piezoelectric Diaphragm-Type Ultrasonic Microsensors by Poling and Influence of in-Plane Stress
    Kaoru Yamashita, Hikaru Tanaka, Atsushi Morimoto, Yi Yang, Minoru Noda
    2014 Volume 134 Issue 5 Pages 119-124
    Published: 2014
    Released on J-STAGE: May 01, 2014
    DOIhttps://doi.org/10.1541/ieejsmas.134.119
    JOURNAL FREE ACCESS
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    Sensitivity modification of tunable ultrasonic microsensors has been investigated in terms of poling effect to the piezoelectric/ferroelectric thin film on the sensor diaphragm. The sensor has a tuning electrode besides a sensing electrode to tune the resonant frequency by introducing converse-piezoelectric stress on the diaphragm. Sensitivity change with poling and tuning voltage applications has been traced on sensors with flat and buckled diaphragms and the buckled-diaphragm sensors have shown anomalies; sensitivity decreases after increase with increasing poling voltage and a butterfly curve of sensitivity to tuning voltage reverses in a high poling voltage region. After the sensitivity investigation the buckling shape of the diaphragm has been profiled under the poling and tuning voltage applications, and the origin of the sensitivity anomalies have been found to be the total stress of the diaphragm and buckling shape of the sensing electrode part induced by the combination of the poling and tuning stress.
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