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Design methodology of LC‐simulation type filters using OTAs to minimize output noise Electron. Commun. Jpn. (IF 0.229) Pub Date : 2021-01-27 Shigetaka Takagi; Hiroki Sato
This paper proposes a design methodology of LC‐simulation type filters using operational transconductance amplifiers in order to minimize filter output noise. Comparison between the proposed method and a conventional one is shown. Simulation results demonstrate validity of the proposed method.
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Saliency prediction based on object recognition and gaze analysis Electron. Commun. Jpn. (IF 0.229) Pub Date : 2021-01-27 Tomoki Ishikawa; Takahiro Yakoh
Predicting the human visual attention in an image is called saliency prediction and is an active research area in the field of neuroscience and computer vision. Early works on saliency prediction was performed by using low‐level features. In recent years, convolutional neural networks have been adapted for saliency prediction and achieved the state‐of‐the‐art performance. However, the eye‐gaze depends
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Extraction of nucleic acid in Escherichia coli and Saccharomyces cerevisiae using high electric field pulse application Electron. Commun. Jpn. (IF 0.229) Pub Date : 2021-01-06 Yuichi Murakami; Ryo Yamashita; Takunao Sato; Yuji Muramoto
An electroporation that formed the pores on cell membrane after application of high electric field pulses has been used the transformation and the sterilization of cell. In this paper, we reported the extraction method of nucleic acid in Escherichia coli and Saccharomyces cerevisiae using high electric field pulse application. The sample was 1.0 × 10–3 mol/L NaCl aqueous solution contained E. coli
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Development of an optical pressure‐sensitive membrane based on plasmon resonance on a gold island film Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-12-31 Nagato Takebayashi; Satoshi Ikezawa; Kentaro Iwami
In this paper, an optical pressure‐sensitive membrane based on plasmon resonance absorption has been designed, fabricated, and demonstrated. The membrane utilizes plasmon resonance on a gold island film embedded in a polydimethylsiloxane (PDMS) layers, and the shift of the resonant wavelength was used as an indicator of pressure‐induced strain of the membrane. The membrane with total thickness of 100
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Mathematical analysis of multiple spike time series synchronized in phase with collective theta wave using neural cell model Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-12-24 Hiroki Noyama; Yuto Yoshikai; Kiyoshi Kotani; Yasuhiko Jimbo
Information processing in the brain is performed by the interactions of numerous number of neurons. However, much remains unknown about complex behaviors of a network composed of numerous number of neurons. Especially, in what case cross frequency coupling emerges and how it alters timings of individual firing are open questions. Therefore, in order to quantitatively evaluate the dynamics of the nervous
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Visualization of flavor of sake using taste sensor and gas chromatography‐mass spectrometry Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-12-23 Yoichiro Kanno; Miyo Hirata; Keiichi Mitani; Shiho Shirota; Takeshi Onodera; Kiyoshi Toko
In the alcoholic beverage industry, expressing “flavor” of sake in an easy‐to‐understand manner is one of the important issues. So far, we have been conducting equipment analyses using taste sensors and sensory evaluation when people actually drink sake in order to easily understand the “taste” of sake felt by the tongue. By combining them statistically, we have developed the “Sake Flavor Chart.” However
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Detection of amine gases by inverse opal photonic crystals infiltrated with precursor HPQ‐Ac of aggregation‐induced emission luminogen Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-12-16 Hiroaki Murakami; Mana Sawada; Taiki Kimura; Toshiki Takahara; Takeshi Onodera
In this study, to detect amine gases such as ammonia, a kind of biological gas, with high sensitivity, we fabricated a device that combines an inverse opal photonic crystal (IOPC) and 2‐(4‐oxo‐3,4‐dihydroquinazolin‐2‐yl)phenyl acetate (HPQ‐Ac), a precursor of the aggregation‐induced emission luminogen. IOPC silica structures (200IOPC, 350IOPC, 500IOPC) with SiO2 were respectively obtained after calcination
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Molecular orientation and electrical properties in tert‐butylated phthalocyanine thin film fabricated by uniaxial solution coating Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-12-13 Genya Uzurano; Yuta Yabuuchi; Ryo Ishiura; Makoto Yoneya; Shusaku Nagano; Hirotake Kajii; Akihiko Fujii; Masanori Ozaki
Molecular orientation, molecular packing structure, and electrical properties of thermally stable phthalocyanine, tert‐butylated phthalocyanine (t‐BuPcH2) in the thin film fabricated by bar‐coating method were investigated. The XRD patterns indicated that the columns composed of t‐BuPcH2 molecules formed hexagonal structure, the axis of which was parallel to the bar‐sweep direction, and t‐BuPcH2 molecules
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Accuracy improvement of terminal voltage self‐coupled laser distance sensor Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-12-11 Tatsuya Ohba; Daisuke Mizushima; Keishiro Goshima; Norio Tsuda; Jun Yamada
Measurements performed using the self‐coupling effect of a semiconductor laser utilize an external resonator by exploiting the reflected light from the surface of an object. The improvement of the measurement accuracy due to the use of self‐coupled signals acquired from terminal voltages has not been thoroughly investigated. The current that flows through a semiconductor laser is adjusted so that its
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Estimation model of muscle fatigue based on muscle fiber type using electromyography Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-12-02 Kosuke Nakashima; Keisuke Isomoto; Daisuke Kushida
In muscle rehabilitation and training, it is important to evaluate a patient's muscle state. In general, training is based on physical therapy, but there has not been quantitative assessment of the actual effects on muscles. The authors previously tried to quantify muscle fatigue and defined “Muscle‐fatigue time (MFT)” as the quantitative evaluation index of muscle fatigue based on electromyography
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Development of auditory catch ball system for improvement of blind person QOL Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-30 Seiichi Suzuki; Masatoshi Osa; Kazuki Sugawara; Shigeru Kato; Motohiro Ohkura; Akihiro Arakawa; Shoichi Uchihara
A virtual‐sound catch ball game system was developed to improve the quality of life of the visually impaired. Computer‐generated virtual sound balls were represented by stereo sounds, comprising localization parameters such as the interaural time and level differences, echo, and head‐related transfer function. Ball‐catching success was determined by images of the hand captured by a USB camera. Two
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Anode shape dependency of discharge characteristics and neutron yield of a linear type inertial electrostatic confinement fusion neutron source Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-28 Tomonobu Itagaki; Eiki Hotta; Jun Hasegawa; Kei Takakura; Shinnosuke Tabata; Yasushi Matsueda
A linear inertial electrostatic confinement fusion neutron source equipped with a cooling system for high power operation was developed and its discharge characteristics and neutron production performance were tested under a wide range of discharge conditions. Four different types of discharge anodes were prepared and the dependencies of the device performance on the anode shape were precisely investigated
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Design strategy of electrode patterns based on finite element analysis in microfluidic device for Trans‐Epithelial Electrical Resistance (TEER) measurement Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-25 Takashi Miyazaki; Yoshikazu Hirai; Ken‐ichiro Kamei; Toshiyuki Tsuchiya; Osamu Tabata
Trans‐epithelial electrical resistance (TEER) is a widely used non‐invasive and label‐free measurement to evaluate the barrier function of mono‐layered cells in real‐time. However, TEER values depend on distribution of electric current densities generated by a combination of shapes and arrangements of plane electrodes for performing TEER, but until now, there is no systematical analysis of their effects
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Analysis of echocardiographic video by dynamic mode decomposition Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-21 Shuya Mizuno; Fuyuki Oneyama; Masato Sugino; Hiroaki Semba; Yasuhiko Jimbo; Kiyoshi Kotani
Ultrasonography is a popular method used for medical diagnosis since it is non‐invasive and does not require extensive equipment. However, it requires appropriate control of the probe position and orientation, which is difficult even for experts. As an approach to realize automatic ultrasonography, we analyze echocardiography video using dynamic mode decomposition (DMD) to obtain its feature value
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A design of EEGNet‐based inference processor for pattern recognition of EEG using FPGA Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-20 Akihiko Tsukahara; Yuki Anzai; Keita Tanaka; Yoshinori Uchikawa
In recent years, brain‐machine interface (BMI) is attracting attention. BMI is a technology that enables machine operation using biological signals such as EEG. For further advancement of BMI technology, there is a need for advanced BMI devices. Therefore, the purpose of this study is development of BMI hardware specialized for handling EEG as an interface for human adaptive mechatronics (HAM) that
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Smart meter‐based home energy report: Design and operation of automatic generation system of hourly usage indication message Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-17 Toshihiro Mukai; Ken‐ichiro Nishio; Hidenori Komatsu; Kazuyuki Kobayashi; Masanobu Sasaki; Wataru Maeki
Home Energy Report (HER) is gathering attention as a method to promote energy conservation behavior in residential sector. Most of the existing efforts about HER assume the use of total monthly usage data. These usually compare customers’ monthly usages with that of similar neighbors. In our study, we developed a HER that uses smart meter data to give graphical information on customers’ monthly, weekly
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A study on technology visualization analysis method using patent classifier Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-16 Masashi Shibata; Masakazu Takahashi
In this paper, we propose an efficient method of technical structure analysis of Field Programmable Gate Array (FPGA) development using network analysis. Recently, with the reform of the industrial structure called “Industry 4.0″ and the explosive expansion of the application area of Artificial Intelligence (AI), the demand for computing power in edge devices is increasing. For these backgrounds, the
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Concept drift detection on stream data for revising DBSCAN Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-16 Yasushi Miyata; Hiroshi Ishikawa
Data stream mining of IoT data can support operator to immediately isolate causes of equipment alarms. The challenge, however, is to keep their classifiers high purity (the data ratio with same proper class in a cluster) with concept drifting ascribed to differences between alarm models and entities. We propose to continuously update data class according to their distribution changes. Through evaluation
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Silicon migration seal wafer‐level vacuum encapsulation Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-16 Yukio Suzuki; Victor Dupuit; Toshiya Kojima; Yoshiaki Kanamori; Shuji Tanaka
Silicon migration seal (SMS) wafer‐level packaging is proposed for high vacuum encapsulation of MEMS. The sealing of vent holes is possible based on silicon surface migration effect at 1100°C in 100% hydrogen ambient without deposition, if the size of the vent holes is properly designed. The feasibility of SMS packaging was experimentally demonstrated using 4‐inch wafers. Hermetic sealing was confirmed
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PEA measurement of low‐density polyethylene using spin‐coated P(VDF‐TrFE) film and acoustic propagation analysis based on viscoelasticity Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-12 Ryotaro Ozaki; Sota Sanada; Kizuki Ochi; Shinji Yudate; Kazunori Kadowaki
Pulsed electroacoustic (PEA) space charge measurement of low‐density polyethylene using a spin‐coated poly(vinylidene fluoride‐trifluoroethylene) thin film is demonstrated. The space charge profile of a low‐density polyethylene film with a thickness of 150 μm is measured by PEA method. Compared with conventional 9 and 30‐μm piezoelectric films, the space charge profile obtained by the 3‐μm spin‐coated
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Surface roughness and crystallinity of silicon solar cells irradiated by ultraviolet femtosecond laser pulses Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-11 Fumitaka Nigo; Masaki Hashida; Masahiro Tsukamoto; Shuji Sakabe; Mitsuhiro Kusaba
Nano/microfabrication experiments on the surface of silicon solar cell are performed by ultraviolet femtosecond laser in the fluence range from 0.10 to 0.70 J/cm2. The surface morphology change of sample was observed by a laser scanning microscopy and a scanning electron microscope. The crystallinity of surface irradiated by laser pulses was evaluated by Raman spectroscopy. The ablation threshold for
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First‐principles based simulation of electron and hole transfer in PET oligmer Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-09 Masahiro Sato; Akiko Kumada; Kunihiko Hidaka
Recently, we have developed a first‐principles based multiscale modeling approach for studying carrier transport properties in polymeric dielectric, and have successfully modeled hole transfer in polyethylene (PE). In this study, in order to see if we can model carrier transport in more complex polymers, we have utilized the multiscale modeling method to simulate electron and hole transfer in polyethylene
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Development of intense terahertz light source for forming periodic structures on material surface Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-04 Chikai Hosokawa; Masaki Hashida; Takeshi Nagashima; Shunsuke Inoue; Shuji Sakabe
We have developed an intense terahertz wave source aiming at in situ measurement of periodic surface structures induced by terahertz waves on solid materials with high‐spatiotemporal resolution. An intense terahertz wave of 119 µJ was generated from a Lithium Niobate crystal induced with an intense laser with fluence of 25 mJ/cm2 by tilted pulse front method. By applying a negative chirp to the laser
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Development of real‐time vibration measurement system by fiber Bragg gratings with pulse light Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-02 Tatsuya Yamaguchi; Yamato Sugimoto; Yukitaka Shinoda
We developed a vibration measurement system by fiber Bragg gratings (FBGs) with a pulse light. The pulse light is produced by modulating a broadband light with an optical fiber switch at a modulation frequency of 40 kHz. This system enables to separate and detect reflection signals from multiple FBGs like a pulse train. This system achieves multipoint and real‐time vibration measurement by FBGs with
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Development of carbon thin film for Laser‐driven heavy ion acceleration using a XeCl excimer laser Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-06 Mitsuhiro Kusaba; Fumitaka Nigo; Kotaro Kondo; Mamiko Nishiuchi; Hironao Sakaki; Hiromitsu Kiriyama; Masaki Hashida; Shuji Sakabe
The carbon thin film as a target for laser‐driven heavy ion acceleration has been developed using the carbonization of polyimide induced by the irradiation of a XeCl excimer laser. The relationship between the depth of the crater produced by the laser irradiation and the laser fluence were measured in order to clear the carbonization mechanisms of polyimide. The melting threshold of polyimide was estimated
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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
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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
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Prediction of penetration depth by laser welding using Hablanian plot method and linear multiple regression analysis Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-02 Manabu Heya; Hiroto Funayama; Akihiko Tsuboi; Masao Tagawa
In order to prove the validity of prediction of penetration depth using Hablanian plot, we have compared experimentally obtained penetration depths with those predicted by Hablanian plot and linear multiple regression analysis. The experimental results with ∼1200 data points were obtained from bead‐on‐plate welding tests by the laser job shop. Stainless steel plates and four types of industrial CW
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Cladding mode loss effect on transmission characteristics of mechanically induced long‐period fiber gratings Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-02 Yasuhiro Tsutsumi; Kenta Kitahara; Masaharu Ohashi; Hirokazu Kubota; Yuji Miyoshi; Ikuo Yamashita
In the mechanically induced long‐period fiber grating (MLPFG) fabricated by applying the periodical pressure on an optical fiber, the small bending occurs due to the periodical pressure, which influences the losses of the core and cladding modes. We propose the theoretical model of the MLPFG for estimating its transmittance based on the transfer matrix method and investigate the effect of the losses
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AI hardware oriented neural network physical unclonable function and its evaluation Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-03 Yusuke Nozaki; Kazuya Shibagaki; Shu Takemoto; Masaya Yoshikawa
AI techniques are required for realizing society 5.0. For the issues of societal implementation for AI, an AI hardware, which is enhanced security performances including authentication, and so on, is needed in order to reduce security risks. This study proposes a new physical unclonable function (PUF) based on neural network (NN) called NN PUF. The proposed NN PUF uses a difference of calculation time
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Estimation of brain response to multimodal stimuli by index of spatiotemporal locality by magnetoencephalography Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-01 Fumina Mori; Keigo Kikuchi; Masato Sugino; Kiyoshi Kotani; Yasuhiko Jimbo
Brain‐computer interface (BCI) enables people who cannot move their own body freely to manipulate machines and helps their communication and life. Recent brain‐computer interface (BCI) uses multimodal stimuli to increase bit rate of the system, so it is important to reveal when and which part of the brain part is activated to discriminate target stimuli. Although magnetoencephalography (MEG) measures
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Assessment of somatosensory sensitivity and activity of the electroencephalogram using body surface electrical stimulation in virtual reality environments Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-11-03 Ryosuke Kasai; Nana Itoh; Fuminori Kamijo; Takashi Kano; Tetsuya Shimamine; Minoru Ogino; Nae Hinata; Kohei Tanaka; Kazuhiko Shinohara; Yuko Mizuno‐Matsumoto
The aim of this study was to assess Virtual Reality (VR) based visual auditory stimulation can relieve pain. To achieve this, the impact that body surface electrical stimulation has on the body surface potentials and activity in the central nervous system in VR environments were extracted. Twenty‐two adults participated in this study. The body surface potentials and Electroencephalogram frequencies
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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
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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
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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
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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
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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
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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.
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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
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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
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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
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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
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Biodevices using microwells sealed with artificial lipid bilayers: Improvement of sealing performance by protein coating Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-07-24 Yoshiaki Kashimura, Koji Sumitomo, Hiroshi Nakashima
The use of microwells sealed with lipid bilayers is promising for biodevices that utilize protein functions. We have fabricated microwell structures on a Si substrate sealed with lipid bilayers. We have investigated Ca2+ ion transport through α‐hemolysin channels with fluorescent microscopy. However, problems remain as regards achieving the detection of smaller signal such as receptor channels. Ion
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Plasma‐on‐Chip: device for non‐thermal atmospheric pressure plasma irradiation to single cells Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-07-23 Shinya Kumagai, Mime Kobayashi, Tetsuji Shimizu, Minoru Sasaki
We report an improvement of the Plasma‐on‐Chip device that enables plasma irradiation to single cells. Dielectric barrier discharge structure was introduced and power consumption was reduced to 200 µW. The modification extended the operation time of the Plasma‐on‐Chip device. As long as 10 min plasma irradiation to yeast cells, Saccharomyces cerevisiae was conducted.
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Numerical modeling and assessment of human exposure to radiofrequency electromagnetic fields used for wireless communication system installed on a smart meter Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-07-18 Takeo Shiina, Kenichi Yamazaki
We assessed human exposure to radiofrequency (RF) electromagnetic fields used for a wireless communication system installed on a smart meter for communication in the 920 MHz band. In an exposure guideline, the specific absorption rate (SAR) is used as a measure of the thermal effects of human exposure to electromagnetic fields. Although the low‐power wireless communication device used for the smart
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Wiring techniques for large size silicon probe using electroplating Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-07-16 Takanori Aono, Masatoshi Kanamaru, Ryuji Kohno, Atsushi Hosogane
To realize an uniformization of wiring thickness on a large size silicon probe, a design of wiring to supply current and electroplating conditions were analytically and experimentally evaluated. Circuit simulations adopted with nonlinear resistance elements clarified the distribution of current density on silicon probes. The voltage drop of current supply wiring on the silicon probe was necessary to
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Morphology and differentiation of human mesenchymal stem cells cultured on a nanoscale structured substrate Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-07-13 Masashi Yamazaki, Hiroki Kojima, Hiromi Miyoshi
Mesenchymal stem cell (MSC) is known to show responsiveness to the physical properties, such as stiffness and nano to microstructures, of the extracellular environment. However, the signaling mechanism has not been fully elucidated yet. Here, the effects of nanoscale pillar arrays of the cell culture substrate on morphology and differentiation were evaluated in human MSC to understand the signaling
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Stimulations inducing tethered lipid bilayer formation on protein‐modified substrate Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-07-11 Ryugo Tero, Junichi Sato
Supported lipid bilayer (SLB) is one artificial biomembrane system used to study transportation reactions through biomembranes using solid devices and surface scientific methods. A key step in the SLB formation is the transformation of spherical lipid vesicles to a planar membrane. We investigated stimulation methods for adsorbed lipid vesicles on a streptavidin‐modified SiO2/Si substrate to induce
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Functional cascading and abstracted energy model in systems engineering and model‐based development Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-06-29 Yukinobu Nakamura, Nobuhiro Hayama, Toru Yamamoto
Systems engineering (SE) and model‐based development (MBD) attract attention from manufacturers to produce more complex products with less rework in order to satisfy higher demands. However, concrete methodology is not defined well. This paper proposes a methodology of target assignment with respect to a special functional cascading for integrated atchitectural products. This paper also proposes “abstracted
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An estimation method of photovoltaics power output using satellite images and power flow Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-06-27 Kazuhiro Yasunami, Osamu Yatsubo, Takashi Washio, Nozomu Takada
There is a growing need to use photovoltaic (PV) technology to mitigate global warming and the depletion of fossil fuels. However, the high network penetration of PVs potentially lessen the stability and the reliability of electrical power systems in various ways. Under its high network penetration, monitoring of the unmeasurable power outputs of PVs is needed for the proper operations of an electrical
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Development of noise correction method of environmental magnetic field with reference magnetic sensor for magnetocardiography Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-06-12 Kuniomi Ogata, Akihiko Kandori
In recent years, a magnetocardiography (MCG) with superconducting quantum interference device with noise level of 50 fT/√ Hz is used for arrhythmia diagnosis. The MCG is usually installed in a multilayered magnetically shielded room (MSR). In the MCG close to some magnetic noise sources like direct current (dc)‐electrified railway, the MCG can stably measure the magnetic field by increasing the number
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Improved parallel reactive hybrid particle swarm optimization using improved neighborhood schedule generation method for the integrated framework of optimal production scheduling and operational planning of an energy plant in a factory Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-06-08 Shuhei Kawaguchi, Yoshikazu Fukuyama
This study proposes improved parallel reactive hybrid particle swarm optimization (IPRHPSO) using an improved neighborhood schedule generation method for the integrated framework of optimal production scheduling and operational planning of an energy plant in a factory. Conventionally, in an energy plant, fixed loads of various tertiary energies have been utilized to solve the optimal operational planning
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Difference of lethal effect for cell type at applying high‐frequency burst pulse for cancer treatment Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-06-05 Hiromi Sato, Yasushi Minamitani, Nobuaki Ohnishi, Yusuke Fujiwara, Sunao Katsuki
Cancer treatment by ultrashort pulse high electric field is one of new biological applications. This work focuses on difference of effects caused at applying the pulse to different types of cells for realizing cancer treatment via ultrashort pulse electric field. In this study, by employing HeLa S3 of a cancer cell and budding yeast of a eukaryotic cell as samples, difference of effects given to each
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Nanoparticles generation using monodisperse droplets by an ultrasonic transducer Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-05-27 Nozomu Fujimoto, Takefumi Kanda, Masaya Katsuta, Yusaku Sakata, Yoshiaki Yamada, Norihisa Seno, Yoshiaki Nakazaki, Takafumi Otoyama
In recent years, a production of nanoparticles has been required in many fields such as production process for electronic materials, foods, and medicine. By using recrystallization process, nanoparticles can be formed by quenching a solution. We have generated monodisperse droplets by using an ultrasonic torsional transducer and a micropore plate to form fine nanoparticles by quenching droplets. In
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Time and space transition characteristics of DC electric field stress in oil‐pressboard composite insulation systems Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-05-26 Ryuichi Nakane, Katsumi Kato, Naoki Hayakawa, Hitoshi Okubo
In AC/DC converter transformers under DC application, the electric field distributions are distorted due to the accumulated charge on pressboard. However, the time‐dependent characteristics of DC electric field stress in oil has not yet been clarified in detail. In this paper, we investigated the time and electric field space transition characteristics of DC electric field distributions in oil‐pressboard
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Statistical analysis of manufacturer difference for miniature triode tube characteristics based on physical model parameters Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-05-16 Masaki Inui, Reo Sasaki, Toshihiko Hamasaki
The sound of the tube amp due to the harmonic distortion has been thought to depend not only on the vacuum tube type but also on the vacuum tube manufacturer and individual differences. However, quantitative differences in tube characteristics of the manufacturer have yet to be revealed. In this study, the characteristics of the triode 12 AX 7 of the five major manufacturers were analyzed based on
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Input bias current reduction technique for operational amplifier in a standard CMOS technology Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-05-16 Koken Chin, Mamoru Ohsawa, Atsushi Kitajima, Yoshiaki Arai, Jun Yamashita, Hisashi Ito, Hao San
This paper presents input bias current (Ibias) reduction technique for high impedance CMOS op‐amps with the proposed current compensation circuit to deal with the leakage current caused by Electro‐Static Discharge (ESD) protection circuit of the IC. High input impedance CMOS op‐amps are widely used for the application of high precision sensors with quite small input current. However, the leakage current
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Frequency response of the vocal tract considering the glottis opening area during human whistling Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-05-14 Mikio Mori, Saki Fukuda
Whistling has become more popular in recent years. “Whistling competitions” are being held in Japan since 2005. However, it can be difficult to teach some people how to whistle. One of the reasons is that theoretical information, including clear descriptions about how to whistle is scant. A better understanding of the principle would be beneficial to both the trainer and the trainee. In this study
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Development of heat dissipation multilayer media for magnetic hologram memory Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-05-14 Yuichi Nakamura, Pang Boey Lim, Taichi Goto, Hironaga Uchida, Mitsuteru Inoue
Holographic memory is a strong candidate for next‐generation optical storage with high recording densities and data transfer rates, and magnetic hologram memory using a magnetic garnet, as the recording material, is expected to be used as a rewritable and stable storage technology. We succeeded in recording and reconstruction of two‐dimensional data in magnetic hologram without error. However, the
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Thin film formation of PEDOT conductive polymer and PVDF piezoelectric polymer by dip‐coating method assuming application to flexible power generation element Electron. Commun. Jpn. (IF 0.229) Pub Date : 2020-05-12 Hiroki Takise, Takuto Shintani, Masato Suzuki, Tomokazu Takahashi, Seiji Aoyagi
Poly(3,4‐ethylenedioxythiophene) (PEDOT) conductive polymer and polyvinylidene difluoride (PVDF) piezoelectric polymer thin films were formed by dip‐coating method. The relationship between drawing speed and film thickness was experimentally investigated. Dip‐coated PEDOT and PVDF thin films were characterized and confirmed that both had surely worked as electrode and piezoelectric film of a flexible
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