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An electronic nose using a single graphene FET and machine learning for water, methanol, and ethanol

Microsystems & Nanoengineering 2020年第1期6卷 969-981页

作者： takeshi hayasaka Albert Lin Vernalyn C.Copa Lorenzo P.Lopez Jr Regine A.Loberternos Laureen Ida M.Ballesteros Yoshihiro Kubota Yumeng Liu Arnel A.Salvador Liwei Lin Berkeley Sensor and Actuator Center&Department of Mechanical Engineering University of California at BerkeleyBerkeleyCA 94720USA Materials Science and Engineering Program College of ScienceUniversity of the Philippines Diliman1101 Quezon CityPhilippines National Institute of Physics College of ScienceUniversity of the Philippines Diliman1101 Quezon CityPhilippines

The poor gas selectivity problem has been a long-standing issue for miniaturized chemical-resistor gas *** electronic nose(e-nose)was proposed in the 1980s to tackle the selectivity issue,but it required top-down chemical functionalization processes to deposit multiple functional ***,we report a novel gas-sensing scheme using a single graphene field-effect transistor(GFET)and machine learning to realize gas selectivity under particular conditions by combining the unique properties of the GFET and e-nose *** of using multiple functional materials,the gas-sensing conductivity profiles of a GFET are recorded and decoupled into four distinctive physical properties and projected onto a feature space as 4D output vectors and classified to differentiated target gases by using machine-learning *** single-GFET approach coupled with trained pattern recognition algorithms was able to classify water,methanol,and ethanol vapors with high accuracy quantitatively when they were tested ***,the gas-sensing patterns of methanol were qualitatively distinguished from those of water vapor in a binary mixture condition,suggesting that the proposed scheme is capable of differentiating a gas from the realistic scenario of an ambient environment with background *** such,this work offers a new class of gas-sensing schemes using a single GFET without multiple functional materials toward miniaturized e-noses.

关键词： methanol selectivity electronic

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Tumor size discrepancy between endoscopic and pathological evaluations in colorectal endoscopic submucosal dissection

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World Journal of Gastrointestinal Endoscopy 2024年第3期16卷 136-147页

作者： takeshi Onda Osamu Goto Toshiaki Otsuka Yoshiaki hayasaka Shun Nakagome Tsugumi Habu Yumiko Ishikawa Kumiko Kirita Eriko Koizumi Hiroto Noda Kazutoshi Higuchi Jun Omori Naohiko Akimoto Katsuhiko Iwakiri Department of Gastroenterology Nippon Medical SchoolGraduate School of MedicineBunkyo-ku 113-8603TokyoJapan Endoscopy Center Nippon Medical School HospitalBunkyo-ku 113-8603TokyoJapan Department of Hygiene and Public Health Nippon Medical SchoolBunkyoku 113-8603TokyoJapan Center for Medical Education Nippon Medical SchoolBunkyo-ku 113-8603TokyoJapan

BACKGROUND Tumor size impacts the technical difficulty and histological curability of colorectal endoscopic submucosal dissection(ESD);however,the preoperative evaluation of tumor size is often different from histological *** influential factors on failure to obtain an accurate tumor size evaluation could help prepare optimal conditions for safer and more reliable *** This was a retrospective study conducted at a single institution.A total of 377 lesions removed by colorectal ESD at our hospital between April 2018 and March 2022 were *** first assessed the difference in size with an absolute per-centage of the scaling ***,we compared the clinicopatho-logical characteristics of the correct scaling group(>-33%and33%),which was further subdivided into the underscaling group(-33%or less of the discrepancy)and overscaling group(33%or more of the discrepancy),*** secondary outcome measures,parameters on size estimation were compared between the underscaling and correct scaling groups,as well as between the overscaling and correct scaling ***,multivariate analysis was performed in terms of the following relevant parameters on size estimation:Pathological size,location,and possible influential factors(P<0.1)in the univariate *** The mean of absolute percentage in the scaling discordance was 21%,and 91 lesions were considered to be incorrectly estimated in *** incorrect scaling was significantly remarkable in larger lesions(40 mm vs 28 mm;P<0.001)and less experience(P<0.001),and these two factors were influential on the underscaling(75 lesions;P<0.001).Conversely,compared with the correct scaling group,16 lesions in the overscaling group were significantly small(20 mm vs 28 mm;P<0.001),and the small lesion size was influential on the overscaling(P=0.002).CONCLUSION Lesions indicated for colorectal ESD tended to be underestimate

关键词： Endoscopic submucosal dissection Colorectal tumor Tumor size Size estimation Size discrepancy

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新型外差式接收机前端

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现代雷达 1980年第5期8卷 105-108页

作者： takeshi hayasaka Mitsuo Noguchi Kazuo Sakamoto 孙保和

引言用来改善外差式接收机前端噪声系数的低噪声砷化镓■效应放大器,当使其正反馈时就产生振荡。■效应放大器不仅放大输入信号,而且也产生本振信号,所以可以省去本地振荡器。因此,可以设计出一个成本低和功耗小的、适用于微波集成电路... 详细信息

引言用来改善外差式接收机前端噪声系数的低噪声砷化镓■效应放大器,当使其正反馈时就产生振荡。■效应放大器不仅放大输入信号,而且也产生本振信号,所以可以省去本地振荡器。因此,可以设计出一个成本低和功耗小的、适用于微波集成电路外差式接收机用的前端。因为振荡器和放大器共用一只■效应放大器,故有相互调制存在,对噪声系数和传输特性会有影响。这个外差式接收机前端,由于使用了在正反馈环路中的混频器的饱和特性(这个环路对于本地信号的振荡是必要的),在■效应放大器的线性段能达到稳定振荡。

关键词：外差式接收机放大器电子设备前端限幅器噪声系数混频器

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酶联免疫吸附法检测家蚕微粒子原虫株系碱溶性孢子表面抗原的研究

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国外农学（蚕业） 1989年第2期 31-34页

作者： takeshi Kawarabata Syoji hayasaka 时连根

在节肢动物病理学中,血清学技术对于病原体的检测、鉴定等发挥了重大作用。然而,有关昆虫病原微孢子虫的血清学研究仅见少量报道。例如间接荧光抗体法的被用于微孢子虫孢子的特异检测(Fujiwara等,1966;Weiser,1976;Sato等,1981;Ni-

关键词：蚕微粒子原虫碱溶性孢子抗原

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