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  • A novel single‐wire communication method using analog wave for a universal connector
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-10-26
    Yoshinobu Tanno; Takafumi Hayashi

    Various devices such as computer and peripheral device contribute to our lives. Because there is a wide variety of devices, the types of device connector standard are increasing. A converter for converting the electrical signal of the pin in a connector is required for communication with different connector standard. However, there is a problem that the number of converters for interconnection continues

    更新日期:2020-10-30
  • Sensing Legionella by photogate‐type fluorescence sensor
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-10-12
    Sawako Tanaka; Young Joon Choi; Makoto Ishida; Kazuaki Sawada; Hiromu Ishii; Katsuyuki Machida; Yasuhiko Nikaido; Mitsumasa Saito; Shin‐ichi Yoshida

    This work describes the way of sensing bacteria, Legionella by photogate‐type fluorescence sensor. Photoirradiation time dependences of L. dumoffii with the UV‐photointensity as a parameter was obtained by the optical sensor. The photocurrents obtained by the sensor decreased depending on the irradiation time, showing the decay process of fluorescent material in Legionella cells. Initial decay rates

    更新日期:2020-10-12
  • Analysis on ceiling space radio wave propagation in indoor environment
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-10-06
    Yoshihito Sato; Ryo Ishiyama; Shigeki Takeda

    In this paper, received power levels in 420 M/920 M/2.4G/5.3 GHz bands for sensor networks and WLANs are obtained by ray‐trace analysis in an office environment and the detail properties of propagation paths are analyzed. As a result, 25% average power of the total power arrives through ceiling spaces in the rooms where electromagnetic waves are hard to arrive through the walls. This means that the

    更新日期:2020-10-07
  • Evaluation of exercise intensity by real‐time skin lactate monitoring system
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-09-28
    Sakae Konno; Yusuke Suzuki; Masanobu Suzuki; Hiroyuki Kudo

    A sweat lactic acid (LA) monitoring system embedded on an armband for evaluation of exercise intensity was fabricated and real‐time LA monitoring of a free‐moving subject was conducted for the first time. The LA monitoring system utilizes an electrochemical biosensor, which uses redox reaction of lactate oxidase immobilized on a screen‐printed carbon graphite electrode. The volunteer wearing the system

    更新日期:2020-09-29
  • Improving the visibility of nighttime images for pedestrian recognition using in‐vehicle camera
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-08-31
    Ryota Ogura, Takeshi Nagasaki, Hitoshi Matsubara

    There is a need for methods to recognize night pedestrian to reduce pedestrian traffic accidents at night. In this paper, we proposed the method that converts images using continuous nighttime images from in‐vehicle camera. The proposed method performs feature extraction that does not depend on one's own vehicle speed because inputting continuous nighttime images, and the function of convolution layer

    更新日期:2020-08-31
  • Detecting tampered region in video using LSTM and U‐Net
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-08-30
    Kunihiko Taya, Nobutaka Kuroki, Naoto Takeda, Tetsuya Hirose, Masahiro Numa

    In the world today, we can always shoot digital videos with smartphones and share them with family or friends after editing them. It is necessary to check whether these videos have been tampered with to use them as forensic evidence in criminal investigations. 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

    更新日期:2020-08-30
  • Study of detection method for collagenase enzyme reaction using two dimensional electrochemical sensor
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-08-26
    Masato Shichijo; Yuki Hasegawa; Hidekazu Uchida

    This paper addresses the assay of collagenase activity using Light Addressable Amperometric Sensor (LAAS). The redox current of LAAS was reduced by deposited collagen layers and recovered by collagenase solution. The collagen layers on the LAAS is considered to be broken down by collagenase. We expect an application of LAAS to activity evaluation.

    更新日期:2020-08-27
  • Plasmonic chip enhanced fluorescence biosensor in the back illumination system
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-08-27
    Keiko Tawa, Takuya Nakayama, Kenji Kintaka

    The plasmonic chip, which has wavelength‐size grating pattern coated with a thin silver or gold film, is applied to a sensitive biosensor because it can provide the enhanced fluorescence excited by the surface plasmon field. We have already reported on the sensitive immunodetection with the plasmonic sensor chip under the illumination system from top panel of a plasmonic chip. In this study, the structure

    更新日期:2020-08-27
  • Bit rate improvement of spatially seamless local communication system using signal multiplexing technique
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-08-24
    Tetsuro Akagawa, Yoshikazu Arai, Shintaro Imai, Toshimitsu Inomata

    In recent years, application of multiple robot system for a large scale system, such as a smart factory, is expected. A system consisting of heterogeneous robots can select the function by switching a combination of the robots according to a purpose. Therefore, the system is more versatile than a single robot on which multiple functions are installed. When the system is controlled by distributed management

    更新日期:2020-08-24
  • The photoresponsive micropump tape using gas generation technology
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-08-17
    Yoshinori Akagi, Daihei Sugita, Kazuki Yamamoto

    Recently, micro‐TAS (Micro Total Analysis Systems) that performs genetic testing on devices containing microfluidics has been actively studied. In micro‐TAS, a micromixer and a microreactor provided on a microfluidic device are driven by feeding reagents with micropumps. Various micropumps were developed and studied: for example, displacement pumps, electro‐osmotic pumps, chemically actuated micropumps

    更新日期:2020-08-17
  • On chip synthesis of Au nanoparticles by microwave heating
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-08-02
    Masaya Takeuchi, Mitsuyoshi Kishihara, Takao Fukuoka, Akinobu Yamaguchi, Yuichi Utsumi

    We demonstrated 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 postwall waveguide, in which metallic posts are continuously arranged on the side wall, is utilized to confine microwave fields. This configuration allows a solution to be inserted

    更新日期:2020-08-02
  • Proposal of micro plasma extraction device by autonomous trigger control
    Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-07-28
    Hiroki Naito, Shunya Okamoto, Yoshiaki Ukita

    In this paper, we report on the development of a microfluidic device, which extracts plasma from low‐volume whole blood (10 μL), and is aimed at integration with microfluidic system for micro analytical systems. The device autonomously separates blood cells and transfers the separated plasma by steady rotation. Based on the original autonomous fluidic control theory, we developed the principle of automatic

    更新日期:2020-07-28