電気学会論文誌C(電子・情報・システム部門誌)
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
140 巻, 4 号
選択された号の論文の20件中1~20を表示しています
特集:ナノ構造の医療・バイオ応用技術
巻頭言
特集論文
<電子物性・デバイス>
<光工学>
<生体医工学・福祉工学>
<システム・計測・制御>
  • 岡本 俊哉, 浮田 芳昭
    2020 年 140 巻 4 号 p. 457-464
    発行日: 2020/04/01
    公開日: 2020/04/01
    ジャーナル 認証あり

    This paper reports on the fabrication and demonstration of a novel autonomous centrifugal microfluidic dispenser that microchannels are patterned on the double side of the microchip. The dispenser executes metering of dispensing volume and injection into each target chamber. In a capillary dispenser that was previously reported is unstable, because liquids in the chambers during metering are kept by capillary force. However, the present double side patterning dispenser does not rely on capillary forces, owing to siphon valves, which three-dimensionally cross chambers and microchannels. In the experiments, it was confirmed that the double side patterning dispenser has a high accuracy of dispensing volume. Moreover, higher stability in repeatedly dispensing test was confirmed, in comparison with the capillary dispenser the. Therefore, it is expected to realize high stability and compact analytical systems, which are suitable for POCT, by integrating the dispenser on analytical devices.

  • 竹内 雅耶, 藤谷 海斗, 三枝 峻也, 石本 睦, 山口 明啓, 内海 裕一
    2020 年 140 巻 4 号 p. 465-470
    発行日: 2020/04/01
    公開日: 2020/04/01
    ジャーナル 認証あり

    We demonstrated a mixing of different density liquids via Euler-force. Euler-force is an inertial force by increase/decrease of angular acceleration on the rotational coordinate system. The mixing method can be universally utilized owing to very simple flow path structure and operation only by rotation control of the device. The method was not carried out about different density liquids, although performed about the same density liquids in previous research. In this study, it was investigated that the Euler-force mixing is also effective for different density liquids.

  • 竹内 雅耶, 岸原 充佳, 福岡 隆夫, 山口 明啓, 内海 裕一
    2020 年 140 巻 4 号 p. 471-475
    発行日: 2020/04/01
    公開日: 2020/04/01
    ジャーナル 認証あり

    We demonstrate the on-chip synthesis of Au nanoparticles achieved by a microwave-induced reaction in a microfluidic channel. The chip structure consists of a waveguide and a microchannel through the inside of the waveguide. A post-wall waveguide, which configures the metallic post on the side wall continuously, is utilized to confine microwave fields. It allows to insert a solution inside the waveguide by microchannel passing between the metallic posts. In order to realize a miniaturization of the chip, the 24.125 GHz industrial, scientific, and medical (ISM) band is utilized instead of the commonly used 2.45 GHz ISM band. When pure water is heated in the microchannel under the microwave input power of 3.0 W, it has been confirmed that the temperature increases to 70℃. In this paper, this chip is adopted to synthesis Au nanoparticles via microwave-induced reaction. After the irradiation of the microwave power 3.0 W and the irradiation time 5 min, we have observed absorbance and dynamic light scattering of the reactant, and the results indicated generation of Au nanoparticles. This microwave synthesis system allows us to achieve automatic and fast selective synthesis of nanoparticles in the solution.

論文
<音声画像処理・認識>
  • 多谷 邦彦, 黒木 修隆, 竹田 直人, 廣瀬 哲也, 沼 昌宏
    2020 年 140 巻 4 号 p. 476-483
    発行日: 2020/04/01
    公開日: 2020/04/01
    ジャーナル 認証あり

    Recently, we can always shoot digital videos with smartphone and share them with family or friends after editing them. It is necessary to check whether they are tampered by someone or not, if we use these digital videos as forensic evidence in criminal investigation. This paper proposes a method for detecting tampered regions in a video where a specific subject is removed from a scene. In the proposed method, we use LSTM for the time domain analysis and U-Net for the space domain analysis. The detection accuracy achieved 0.98 in terms of F-measure, even though tampered region was deformed or moved in the video. The experimental results show superior performance to detect tampered regions for digital videos.

<情報処理・ソフトウェア>
  • Masaru Shiozuka, Tappei Yotsumoto, Kenichi Takahashi, Takao Kawamura, ...
    2020 年 140 巻 4 号 p. 484-491
    発行日: 2020/04/01
    公開日: 2020/04/01
    ジャーナル 認証あり

    Target monitoring systems are widely used in various areas such as companies and schools for the prevention of crimes. Such systems require the operators to monitor the information sent from monitoring devices, such as cameras and/or beacon sensors. To reduce the burden on the operators, we have proposed an automatic target tracking system based on mobile agent technologies. The system succeeded in tracking targets when radio frequency identifier (RFID) sensors were used as monitoring devices. However, it sometimes resulted in target recognition errors when cameras were used. In this paper, we propose a method to address target recognition errors. In this method, an agent changes its behavior according to the distance calculated from pictures taken by a camera. We also validated our approach in terms of tracking accuracy through simulation.

資料
<システム・計測・制御>
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