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Development of a virtual reality system that generates prism adaptation for multiple motor units Electron. Commun. Jpn. (IF 0.3) Pub Date : 2024-02-26 Takashi Ishida, Hiroki Higa
Conventionally, the adaptive body area for prism adaptation (PA) has been limited to the visible area of prism glasses, especially the unilateral upper limbs. In this study, we developed a virtual reality system that extends PA's adaptive body area. This system sets the visible area of the target and introduces a symbolic representation of the body position to realize a head position adaptation task
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Design of a model-free controller based on predictive functional control Electron. Commun. Jpn. (IF 0.3) Pub Date : 2024-02-13 Yoichiro Ashida, Masaru Katayama
Intelligent-PID (i-PID) control proposed by Fliess is a simple control algorithm. The controller is designed based on ultra-local model, and consisted of PID type controller and derivatives of reference signal and controlled variables. Authors have considered discrete i-PID controller and its properties, and one of the result was that PD controller was sufficient in discrete time domain. In discrete
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Investigation of vacuum measurement by nano-gap device Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-12-23 Kazuki Komiya, Koki Nagata, Hidehiko Yamaoka, Shuichi Date, Yuito Miyashita, Min Yan
Advances in microfabrication technology have enabled electron beam lithography (EB lithography) systems to produce microfabrication on the order of 10 of nanometers. Using this technology, we have fabricated nanogap electrodes that can generate large electric fields at low voltages. The gap between the tips of the fabricated electrodes is 100 nm, and the curvature of each tip is 50 nm. The device was
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Cuff-less blood pressure estimation using hetero-core optical fibers Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-12-14 Yuya Koyama, Hiroki Kamada, Kazuhiro Watanabe, Michiko Nishiyama
In this study, we proposed a cuff-less blood pressure measurement using a medical tape sensor with an embedded hetero-core optical fiber. The tape sensor pasted on the skin can directly detect pulse wave signals with a simple measuring device. Pulse transit time (PTT) was obtained from the time difference between the two pulse waveforms at the neck and foot. Systolic blood pressure (SBP) was estimated
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Gas pressure dependence of optical and mechanical properties in a SiCO thin film for optical waveguide by reactive sputtering method Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-12-06 Hiroyuki Nikkuni, Hiroshi Ito, Yu Takatsuka
In this study, the gas pressure dependence of optical and mechanical characteristics in reactive sputtered SiCO thin films for optical guided-wave pressure sensors was experimentally investigated. Thin films were fabricated by varying the gas pressure from 0.3 to 1.0 Pa at an oxygen flow ratio of 6%, and the gas pressure dependences was clarified. As the gas pressure increased, the optical bandgap
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Analytical method of DC input impedance for stability analysis of IPM motor drive system Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-12-05 Takaya Karino, Toshiji Kato, Kaoru Inoue
This paper proposes an analytical calculation method of frequency characteristics of DC input impedances of an IPM motor drive system for design and stability analysis by the impedance method. The proposed method is based on an averaged frequency model linearized at an operating point. The developed small-signal model considers control principles and mechanical perturbations. It is an analog and digital
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Development and practice of learning materials for an engineering oriented circuit design workshop for elementary school student Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-12-02 Tadashi Ishibashi, Jun Moriyama
This study aimed to develop teaching materials for circuit design and fabrication for elementary school students, and conduct workshops oriented to engineering. First, the content of the circuit design workshop was discussed and it was determined that a connection-focused design would be appropriate. Second, we examined the issue of existing teaching materials. Many of the existing kit materials were
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Study of humidity sensor using α-Fe2O3 as a humidity-sensitive material Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-12-02 Kosuke Naito, Kyohei Sasaki, Noriaki Ikenaga
In this study, iron oxide thin films are prepared under various heat treatment conditions, and their crystal structures and moisture-sensitive characteristics were evaluated to clarify the usefulness of iron oxide thin films as humidity-sensitive materials for humidity sensors. In addition, the possibility of a humidity sensor with a wide dynamic range was investigated by evaluating the relationship
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Autonomous configuration establishment method of wireless network on condition monitoring for coupling and decoupling of railway vehicles Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-11-13 Nagateru Iwasawa, Yuta Hosokawa, Akio Hada, Shogo Mamada, Shuji Harashima, Yasushi Fuwa
In recent years, with the development of IoT, research and development of wireless sensor networks for monitoring has been advanced to monitor the condition of various devices in railway vehicles and notify train crews. In the operation of railway vehicles, the composition may be changed at stations by coupling and decoupling, and it is necessary to set up inter-vehicle wireless network considering
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Terahertz radiation from shockwave front irradiated with femtosecond optical pulses Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-11-08 Takeshi Nagashima, Hsinhui Huang, Koji Hatanaka
Femtosecond double optical pulse experiments with nanosecond time delay were conducted in air. Terahertz pulses were generated from laser plasmas produced by the irradiation with the main pulses on shockwave excited by the pre-pulse illumination. Intensity of the terahertz pulses depends on the time difference Δt and relative position Δy between the pre- and main pulses. We found a characteristic dependence
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A study on MMG sensor using piezoelectric polymer nanofibers by electrospinning Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-11-06 Rintaro Abe, Koa Yasuda, Takefumi Kanda, Shuichi Wakimoto, Hisao Oka
In the fields of medical and sports science, it is required to evaluate muscle activity qualitatively and quantitatively. Currently, mechanomyogram (MMG) that can reflect the mechanical activity of muscle fibers is attracting attention. The purpose of this study is to develop a sensor that can measure MMG during exercise. In this study, a small and flexible MMG sensor using P(VDF/TrFE), which is a
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Modeling framework for batch-dependent dynamics of reaction process by combining first principles and machine learning Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-10-23 Taichi Ishitobi, Yohei Kono, Yoshinori Mochizuki
We propose a modeling framework for automating batch processes operation. Batch processes are often controlled by PID controllers, where engineers manually regulate their parameters and temporal patterns of reference signals. Therefore, it takes a long time for optimizing these parameters and temporal patterns. A possible solution for this is to apply so-called Model Predictive Control (MPC) technology
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Estimating the Ballast bed shape using Camcorder video Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-10-18 Riho Maeda, Nozomi Nagamine, Yosuke Tsubokawa, Wataru Goda
To properly maintain and manage track surfaces, the amount of collapsed settlement of a ballast bed must be determined. However, high maintenance costs make it difficult for railway operators to fully maintain and manage track surfaces. Therefore, we propose a method of estimating the shape of the ballast bed using Dense Inverse Search (DIS) optical flow in images captured using a camcorder, which
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Thin diameter optical displacement sensor for grasping force sensing of surgical robot Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-10-09 Jiayuan Dong, Kazutaka Sato, Shuichi Morizane, Masaru Ueki, Atsushi Takenaka, Sang-Seok Lee, Tadao Matsunaga
The purpose of this study is to realize a grasp force measurement of forceps for robotic surgery systems. Generally, surgical robot forceps is actuated by traction wire, and we have suggested a newly force sensing system by measuring the wire expansion utilizing micro displacement sensors. For measuring the elongation of the wire, the white-light interference principle has been utilized on sensor system
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Development of a stand-alone portable respiratory rate monitor using a Doppler radar Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-10-09 Miyu Katoh, Takeru Kanazawa, Yoshifusa Abe, Guanghao Sun, Takemi Matsui
Respiratory rate (RR) is known to be a more accurate predictor of clinical deterioration than other vital signs. However, there were few respiration measurement devices certified as medical devices that could be used in daily clinical settings. Therefore, using a bult-in microcontroller (72×57×12 mm) instead of a personal computer, we developed a portable stand-alone respiration measurement device
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Loss function for ambiguous boundaries for deep neural network (DNN) for image segmentation Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-10-04 Yuma Hakumura, Taiyo Ito, Shiori Matsui, Yuya Akiba, Kimiya Aoki, Yuki Nakashima, Kiyoshi Hirao, Manabu Fukushima
This study deals with the task of segmentation of SEM images of fine ceramics sintered bodies by using deep neural network (DNN). In particular, we focus on misclassification caused by the blurriness of grain boundaries(boundaries between particles). Therefore, we utilize the frequency distribution of brightness gradient of grain boundaries and give higher weights to pixels with lower gradient values
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Development and user evaluation for a robust character input support system for natural images of electricity reading slips Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-10-03 Toshiharu Igarashi, Toshihiro Kobayashi, Misato Nihei
Text input, which is essential for a variety of applications, is one of the most difficult operations for older people. So, we propose a prototype to automatically detect and input text from a natural image taken from a user's smartphone. For the evaluation of the system, 232 photo data taken by the actual people were prepared. When all data was processed on the server, the average processing time
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BEMS architecture and service modules for realizing sophisticated algorithms Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-09-09 Toshihiro Mega, Koudai Murakami, Noriyuki Kushiro
There is a growing interest to introduce energy-saving algorithms which balance energy efficiency with residents’ comfortability into a building energy management system (BEMS). However, the following issues hinder penetration of the energy-saving algorithms into markets: difficulties both in embedding the algorithms into the BEMS, and in turning the algorithms suitably to fit varieties of installed
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A basic study of pretreatment method using antibody modified with glucose oxidase for pungent-taste measurement of taste sensor Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-31 Yuki Hirayama, Takeshi Onodera
A polyclonal antibody against the analog of piperine, which is a typical pungent taste substance, was produced, and its binding ability to piperine was evaluated using a surface plasmon resonance sensor. The antibody was labeled with glucose oxidase (GOx), and the hydrogen ions produced by the enzymatic reaction were measured at a lipid polymer membrane electrode for sourness in a taste sensor. The
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Measurement of acetylcholinesterase using a two-dimensional electrochemical sensor LAAS Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-31 Akitsugu Miyairi, Yuki Hasegawa, Hidekazu Uchida
In this study, we measured the enzymatic activity of acetylcholinesterase (AChE) using the Light Addressable Amperometric Sensor (LAAS), an electrochemical sensor that can easily measure redox current values of multiple samples. Acetylthiocholine (ATCh) was used as a substrate. ATCh is hydrolyzed by AChE and releases electrons, making it possible to measure current values in accordance with the amount
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Nonstationary time series change direction forecast method using improved leading indicator Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-30 Hirokazu Yoshida
This paper presents a method for forecasting the change direction of nonstationary time series using the improved leading indicator. The leading indicator is a method developed by Ehlers that translates a time series mathematically in the future direction with respect to the time axis and calculates the leading value of the time series. However, this method has the problem that the leading value can
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A study on comparing method of motion classification using muscle bulging for control of powered prosthetic hand Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-30 Hayato Iwai, Feng Wang
Aiming at the control of a powered prosthetic hand, this paper compares methods for the classification of intended hand motions using muscle bulging patterns caused by muscle contraction. Two sheets of Polyvinylidene Difluoride (PVDF) film were used as sensors to detect the muscle bulging on the forearm caused by intended hand motions. A neural network had been successfully trained for the classification
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An activity recognition system at home based on illuminance sensors Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-28 Hiroyuki Matsubara
A social issue that leads to the safety and security of people is the network that monitors the safety of people living alone in remote areas. Various research and developments of indoor human activity recognition using IoT sensor nodes have been conducted in recent years. In this research, we focus on turning on and off indoor lighting and propose an activity recognition system at home using an illuminance
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Developing evaluation method for peripheral sensitization in cultured sensory neurons Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-25 Yuki Miyahara, Kenta Shimba, Kiyoshi Kotani, Yasuhiko Jimbo
Peripheral sensitization, decrease in pain threshold in sensory neurons, can cause chronic pain. Little is known about how peripheral sensitization led to chronic pain. Here, we aimed to develop a method for evaluating peripheral sensitization in cultured sensory neurons with electrical recording. Sensory neurons from rat dorsal root ganglion were cultured on high-density microelectrode arrays (HD-MEA)
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High speed calculation method using convolution for calculating normal and disaster costs of buildings with energy generation and storage facilities Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-25 Sota Kinoshita, Nobuyuki Yamaguchi, Yuta Kimura, Fuyuki Sato, Shinichiro Otani
In recent years, resilience-enhanced building buildings have been attracting increasing attention, in which photovoltaic (PV) power generation and storage batteries are installed in office buildings to continue operations even during a grid outage. PV power generation and storage batteries can be introduced to office buildings to continue commercial operations in the case of grid outages. When introducing
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Needle-type pressure sensor with silicone oil and parylene membrane inside for minimally invasive measurement Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-24 Takuto Kishimoto, Masakazu Agetsuma, Ayuko Hoshino, Hidetoshi Takahashi
This paper addresses a pressure sensor for body pressure measurement. Many pressure sensors have been developed for disease treatment in the medical field. However, these sensors require inserting electronic components and other sensor elements via surgical operations, so the measurement physically burdens patients. Hence, we proposed a needle-type pressure sensor using MEMS (Micro Electro Mechanical
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Development of frequency measurement circuit for soil moisture content and electric conductivity measurement system with detection of soil transient response characteristics for on-site measurement Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-24 Sohei Takimoto, Ryuki Shigemasu, Motoki Fujisono, Satoshi Ota, Masato Futagawa
In agricultural field, compact sensors that can measure both water content and electric conductivity are needed. Focusing on the fact that water content and conductivity depend on soil impedance, our group has been developing a new compact and noise-resistant driving circuit that measured soil impedance by detecting transient characteristics of the voltage obtained by injecting current through the
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Object judgment with an event-driven MEMS-LSI integrated tactile sensor array system Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-24 Masanori Muroyama, Shuji Tanaka
We have developed tactile sensor systems for next-generation robots. To install a large number of tactile sensors, we have proposed micro electro mechanical systems-large-scale integration (MEMS-LSI) integrated tactile sensors. The integrated device has the following features: capacitive type three-axis force sensing, embedded diode-based temperature sensing, signal processing for sensing data digitalization
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Capacitor-voltage-balancing control for isolated medium-voltage AC-DC modular matrix converter Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-23 Kohei Budo, Takaharu Takeshita
This paper presents a capacitor-voltage-balancing control scheme for an isolated medium-voltage AC-DC converter using level-shifted pulse width modulation (PWM) control of a modular matrix converter (MMxC). The proposed isolated AC-DC converter is composed of the primary MMxC with level-shifted PWMcontrol, high-frequency transformer, and secondary H-bridge circuits. The high-frequency transformer of
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Data-driven control by using data-driven prediction and LASSO for FIR typed inverse controller Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-23 Motoya Suzuki, Osamu Kaneko
In this paper, we propose data-driven control for the case of that the structure of the ideal controller is unknown. In this case, it is natural to implement FIR typed controller. Here, we utilize FRIT for the case of FIR typed inverse controller. In general, FIR might have unnecessarily large number of its taps. To prevent it, we also utilize LASSO regression so as to realize FIR typed inverse controller
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VIMT of non-minimum phase system by using initial control signal Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-21 Motoya Suzuki
In this paper, input-oriented virtual internal model tuning (VIMT) is expanded to non-minimum phase systems. Proposed method can tune the feedback controller and the desired transfer function. Compared to Fictitious Reference Iterative Tuning (FRIT), the proposed method can realize good controllers even when the time constant of the desired transfer function is small. The validity of the proposed method
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Development of wrist-watch type biosensing system for real-time sweat lactate monitoring Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-21 Sakae Konno, Hiroyuki Kudo
A wrist-watch type biosensing system for real-time sweat lactic acid (LA) monitoring was fabricated and tested. The system consists of a microfluidic LA biosensor, a carrier-flow supplying device, and a sampling device for transporting whole secretions at the skin surface to the biosensor by continuous flow of phosphate-buffered saline (PBS). The perfusion test of PBS onto the skin surface by using
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Fabrication and characteristics of electret ultrasonic-sensor using laser patterning Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-21 Kakeru Kobayashi, Yoshiaki Kawada, Kensuke Kageyama
In this study, in an electret capacitor sensor (ECS), which is an electromechanical exchange device consisting of an electret sandwiched between two electrodes, ridges as spacers and grooves as gaps were formed in the PTFE (polytetrafluoroethylene) layer of the insulating electrode by laser ablation. The ECSs were then fabricated using PTFE electrets, and the charge retention and airborne ultrasonic
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Development of capacitive seating analysis sensor using conductive textile for the evaluation of seating motion Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-21 Hirofumi Kurosaki, Hiromu Shirahata, Junya Kawahara, Yasuhito Kondo, Ken Kondo, Bumsuk Lee, Masato Odagaki
In this study, we developed a capacitive seating analysis sensor using a conductive textile for evaluating a Seating Motion. Physical burden on caregivers is a common problem at nursing care sites. Developing long-term caregiving skills can help reduce the physical burden on amateur caregivers. Several quantitative evaluation studies have focused on the skills of caregivers. However, such evaluation
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A hierarchical neural network model for Japanese toward detecting mild cognitive impairment Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-21 Tetsuji Goto
We found that some signs of mild cognitive impairment (MCI) might be presented in a structure of a sentence and a relation between sentences talked by a man, and develop a neural network model which has an analogy with the hierarchical structure of speakers, topics, sentences and words in Japanese. We build our model based on 2-layered bi-directional LSTM, corresponding to words-sentences and sentences-topics
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Effects of bedtime mouthwash use on sleep: A field sleep study using wristwatch-type heart rate monitoring devise Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-21 Mami Ishikawa, Yusuke Mon-Nai, Ayana Hirono, Yoshiyuki Oshima, Shusaku Nomura
This study aimed to test the efficacy of a mint-flavored mouthwash when it is used at bedtime for subsequent sleep in a field study setting, using a wristwatch-type heart rate (HR) monitoring devise. Using a within-subject experimental design, twenty healthy adults used three types of mouthwash having a different intensity of mint sensation (or water as a control) per one experiment night just before
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Detection of acoustic emission during fermentation using an electret sensor Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-19 Kensuke Kageyama, Yuma Kawarai
In this study, we focused on acoustic emission (AE) as a method for quantitative evaluation of fermentation. Since bubbling in the culture medium and detachment of the medium during fermentation are considered to be phenomena similar to corrosion, AE could be expected to be detected. Therefore, we conducted AE measurements using ECS during fermentation of yeast in sucrose solution, fermentation of
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Characterization of the VO2 thin films grown on glass substrates by MOD Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-16 Hideo Wada, Taito Fukawa, Kazuaki Toyota, Masatoshi Koyama, Nobuya Hiroshiba, Kazuto Koike
This paper describes the deposition of Nb doped vanadium dioxide (VO2) films on a glass substrate by metal organic decomposition (MOD) and their thermochromic properties. The difference in thermochromic properties of VO2 thin films on a glass substrate was investigated with and without a buffer layer of Hf0.5Zr0.5O2 (HZO). The phase transition temperature of VO2 thin film successfully reduced from
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Realization of a database-driven PID control system using a CMAC memory Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-08-15 Zhifeng Li, Zhe Guan, Toru Yamamoto, Sigeru Omatu
As a nonlinear control approach, a database-driven PID (DD-PID) controller has been proposed that uses distance calculations of an initial database to tune PID parameters. However, sorting operations are required in extracting neighborhood data from the database, which imposes a large computational load. Therefore, it is impossible to finish this computation within a restricted sampling period in control
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Sign-indefinite linear quadratic differential game for stochastic systems via static output feedback strategy Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-06-16 Muneomi Sagara, Hiroaki Mukaidani
Sign-indefinite linear quadratic differential game for stochastic systems by means of static output feedback (SOF) strategy is investigated. First, the saddle point equilibrium condition of external disturbance and control strategy is established based on stochastic cross-coupled algebraic matrix equations (SCCAMEs). Second, the numerical algorithms for solving the SCCAMEs are discussed. In particular
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Optimal segmentation of Halbach sphere Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-05-29 Kazuhiro Nishimura
The direction of magnetization in which the magnetic field becomes the strongest in the x-axis direction in the spherical coordinate system is used. Its magnetic field depends on the φ direction in the spherical coordinate system, that is, strongest at the top (φ = 0) and the bottom (φ = π), and the side (φ = π⁄2) becomes the weakest. Therefore, when segmenting, it was divided to include the top and
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3D motion analysis of kick start motion−Effects of upper limb movements on the body when leaving the platform− Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-05-27 Hiroki Hyodo, Tadashi Wada
The purpose of this study was to clarify the effect of the presence or absence of upper limb movement on the propulsion direction body velocity (TPV) leaving the platform at kick start. The first trial (Standard trial) is a normal kick start, and the second trial (Lower trial) is the same as a normal kick start. The force from the upper limb movement at the time was set so that the start table was
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Development of feedback system by customized UI to improve UX of web page Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-04-06 Tatsuhiro Motobu, Koji Kida
In recent years, the number of websites has been increasing, and with it, the number of similar services. As a result, UX is becoming more and more important to measure the differentiation of a website from its competitors, and UI plays a major role in improving UX. Website developers implement a development process called HCD to improve UI. However, in HCD, there is a gap between the perception of
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Electrical conductivity measurement using a microfluidic chip and evaluation of vsiscosity by Walden's rule Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-03-03 Kenji Sakamoto, Yuriko Hachiya, Koichiro Kobayashi
In this study, the electrical conductivity of low-volume samples was measured using a prototype microfluidic chip with electrodes. We were able to show the difference of electrical conductivity in the samples of saline solution (0.9w/v% NaCl solution) with sucrose. The correlation between the electrical conductivity and the viscosity evaluated by the capillary method was shown. This correlation was
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Three-phase wireless power supply system using a matrix converter Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-02-11 Koki Yamanokuchi, Keisuke Kusaka, Jun-Ichi Itoh
This paper proposes a three-phase wireless power transfer (WPT) system with a three-phase-to-three-phase matrix converter. The proposed system directly converts power from an AC grid to high-frequency AC for WPT. The three-phase WPT system with the matrix converter is effectively expands the lifetime of the WPT system. A novel hybrid commutation method, which is suitable for the WPT system with a resonant
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Analysis of terahertz double dielectric structure patch antenna using nitride semiconductors Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-02-11 Shin Miura, Kenta Kurahashi, Keishiro Goshima, Masanori Nagase
Recently, gallium arsenide (GaAs)-based resonant tunneling diode (RTD) oscillators and indium phosphorus (InP)-based Schottky barrier diode (SBD) receivers have been studied in the terahertz (THz) band. The THz devices for practical use should operate at room temperature, be small in size, and have high output power. Therefore, this study was focused on gallium nitride (GaN), which possesses excellent
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Discrimination of clothing materials from smartphone camera images Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-02-09 Ryohei Koike, Keiichi Yamada
Information on fabric material is necessary in washing and ironing clothing. However, indication on a care tag may peel off or the tag may come off due to deterioration over time. Discrimination of the material from the fabric itself is not easy for a general person. Estimating the material of an object is one of the challenging tasks in computer vision. This paper deals with the identification of
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Effect of platinum buffer layer on the fabrication process of flexible ferroelectric epitaxial thin films Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-02-09 Tomofumi Mizuyama, Hiroaki Nishikawa
Epitaxial thin films of a ferroelectric perovskite-type oxide grown on single-crystalline SrTiO3 (100) were transferred onto a flexible printed circuit (FPC). In the case that the thin films were directly adhered onto FPC using a copper foil double-coated conductive adhesive tape (Cu double-sided tape), serious cracking and exfoliation occurred during the transfer process. To avoid these damages, we
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Analysis of quantum confinement in nanosheet FETs by using a quantum drift diffusion model Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-02-08 Masashi Matsuda, Akira Hiroki
In this paper, we have analyzed quantum confinement effects in nanosheet MOSFETs by using a quantum drift-diffusion (QDD) model. The QDD model is a device simulator which allows to simulate quantum confinement effects in the inversion layer for advanced MOSFETs. The quantum confinement effects in nanosheets have been analyzed by comparing the simulation results by QDD and drift-diffusion (DD) model
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Microfluidic device for differentiation induction of iPS cells derived embryoid bodies with local chemical stimulation Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-02-08 Naoto Kusunoki, Shuhei Konagaya, Mitsunori Nishida, Shigehiro Sato, Hidekuni Takao, Fusao Shimokawa, Kyohei Terao
This paper reports a microfluidic device that allows us to measure the effect of local differentiation stimulation on embryoid bodies for the purpose of elucidating the role of the cell-cell interaction of iPS cells in differentiation induction. We developed the local stimulation device having two chambers separated by thin polydimethyl siloxane (PDMS) membrane with through-holes of the diameter smaller
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Interaction between diamond and alkali metals and its application to machining of diamond Electron. Commun. Jpn. (IF 0.3) Pub Date : 2023-02-07 Toshihiro Shimada, Hiroki Takehana, Ichiro Yamane
The interaction between diamond surfaces and alkali metals was studied experimentally and computationally. Li reacted with diamond above 600°C and significant etching of (100) surface was observed. An attempt was made to apply this etching reaction for electrical discharge machining of diamond tools.
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Design of a database-driven soft-sensor and its application to a control system Electron. Commun. Jpn. (IF 0.3) Pub Date : 2022-10-19 Takuya Kinoshita, Haruka Kano, Toru Yamamoto
In industries, it is difficult to measure physical quantities such as product quality. In order to estimate it, soft sensors have been proposed. In recent years, the Just-In-Time (JIT) method has attracted attention. According to this method, the output is estimated by extracting data from the database similar to the current situation. On the other hand, a database-driven control system has been proposed
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Human dense avoidance based on a coverage control through robots Electron. Commun. Jpn. (IF 0.3) Pub Date : 2022-10-17 Shu Morita, Yuki Okura, Chiaki Kojima
In this paper, we propose an efficient method for human dense avoidance based on a coverage control. Our motivation is to avoid crowding in public facilities such as stations and government offices, and human dense in the current situation of COVID-19 from system and control theory. In this paper, humans and robots are modeled as heterogeneous and homogeneous agents, respectively, which make decisions
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Assist control for human-robot cooperative transportation systems using nonlinear disturbance observer Electron. Commun. Jpn. (IF 0.3) Pub Date : 2022-10-17 Yuki Okura, Tomohiro Nakada, Chiaki Kojima
In this paper, we investigate an assist control for a system in which a human and a robot cooperate to transport an object toward a designated position and angle. We consider a situation where the force due to the human to the object cannot be measured directly. In order to tackle this situation, an assist control with a nonlinear disturbance observer is proposed. By using the observer, we estimate
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Attenuation band impedance matched BRF for measurements of electromagnetic noise Electron. Commun. Jpn. (IF 0.3) Pub Date : 2022-10-17 Jun Hayashi, Yoshio Nikawa
Wireless communication devices such as wireless LANs and RFIDs are essential for smart home appliances and IoT (Internet of Things) devices in Smart Cities. When measuring the high-frequency noise generated by devices, wireless signals of wireless communication devices and high-frequency noise are measured at the same time. As a result, spectrum analyzers have insufficient dynamic range, or the excess
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Evaluation of potential for peak demand reduction of residential buildings by household appliances with demand response Electron. Commun. Jpn. (IF 0.3) Pub Date : 2022-10-17 Tetsushi Ono, Aya Hagishima, Jun Tanimoto
Residential appliances remotely controlled by IoT for demand response has attracted much attention for effective peak demand reduction of the uncertainty of consumers’ behaviors. To promote the technology development of such appliances, estimation of the potential for peak demand reduction according to the type of appliances is strongly needed. With this background, the authors conducted a data analysis
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Enhancement of photocatalytic degradation by combination of light illumination and bias voltages toward anti-virus coating applications Electron. Commun. Jpn. (IF 0.3) Pub Date : 2022-10-14 Keita Shimakura, Sho Saeki, Yuta Segawa, Taizo Kobayashi
In this work, oxidative decomposition reaction of organic reactant on TiO2 surface was investigated under soaking conditions by combination of applying voltages and light illumination. Since carriers of TiO2 thin films originate from point defects such as oxygen vacancies, reactive carriers possibly exist on TiO2 thin films even under room light illuminating condition and dark condition. Thus, enhancement
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Examination of insulation diagnosis in substation by neural network with phase-resolved partial discharge pattern reconstruction Electron. Commun. Jpn. (IF 0.3) Pub Date : 2022-09-20 Shunya Fujioka, Hideaki Kawano, Masahiro Kozako, Masayuki Hikita, Osamu Eda, Shuhei Yaguchi, Yasuharu Shiina
Several studies for partial discharge (PD) pattern recognition using artificial neural network (ANN) were reported in the early 1990s. Usually, in an actual field such as a substation, data on partial discharge is scarcely available, or even rare. In many cases, the power supply phase required for the PRPD pattern cannot be easily obtained. We propose an ANN method that shifts the phase in which the
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Evaluation of transmission characteristics of differential and common modes of parallel two-conductor microstrip lines with a Co-Zr-Nb film Electron. Commun. Jpn. (IF 0.3) Pub Date : 2022-09-05 Masataka Masaki, Sho Muroga, Takahiro Mikami, Motoshi Tanaka
The effect of sheet- and film-type electromagnetic noise suppressors on differential mode (DM) and common mode (CM) transmission characteristics in two parallel lines was investigated. Simple two parallel microstrip lines with a Co-Zr-Nb film were used as a test bench. The transmission characteristics of DM and CM were measured by four-port network analyzer. The ferromagnetic resonance (FMR) and eddy