The Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP
Online ISSN : 2424-3140
Current issue
Displaying 1-50 of 63 articles from this issue
  • Takehiko EGUCHI
    Session ID: IIP1R1-C03
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    This paper proposes a sampled-data polydyne as a feedforward input for a high-speed and high-precision positioning control system that does not excite specified mechanical resonant modes. The polydyne curve is an optimal cam profile that does not generate residual vibrations due to the follower's resonant mode. Research papers have reported applications of polydyne curve to feedforward control, and they have been formulated in continuous-time domain. However, when the frequency of vibration to be suppressed is high and the sampling frequency is relatively low, the reference trajectory for feedforward control should be generated in discrete-time domain. Thus, we derived the sampled-data polydyne which is a formulation of the polydyne curve in discrete-time domain. For suppressing one resonant mode, the order of polynomial must be seventh or higher, and eleventh or higher-order is necessary for suppressing two modes. Simulations of seek control in a hard drive was performed with the proposed feedforward input using sampled-data polydyne. It was confirmed that the sampled-data polydyne input suppressed the residual vibrations substantially and improved the tracking error after seek motion. Furthermore, it was shown that the apparent damping ratio in the residual vibration should be used for generating the polydyne feedforward input instead of the true modal damping ratio of the control object.

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  • Fumito MIYAZAKI, Ryunosuke GANDO, Daiki ONO, Shiori KAJI, Hiroshi OTA, ...
    Session ID: IIP1R1-E01
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    This paper reports on a direct angle sensing rate integrating gyroscope (RIG) for high accuracy inertial navigation and automatic driving, which is characterized by high accuracy angle detection without the effect of integration error present in conventional rate gyros. On the other hand, asymmetry of frequency and damping due to manufacturing error causes two problems: detection limit of low speed rotation and cyclic angle error. In this paper, we present a method of low-speed rotation detection using "virtual rotation control," in which a constant rotation is applied by electrostatic force, as well as a correction method by modeling the angle error, and report the world's first detection of the earth's rotation using a 5 cm square module.

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  • Taishi MATUSI, Kiyoshi MATSUMOTO
    Session ID: IIP1R1-E02
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    When humans are presented asymmetric vibrations having an acceleration that changes momentarily and an acceleration that changes slowly in the opposite direction to humans fingertips, humans have illusion of being pulled in one direction even though the force works in two directions. This illusion is called pulling illusion. It is expected to apply walking support system and feedback of force sense VR system. Several devices which cause pulling illusion is reported, but input parameters are different each devices. We must design current wave considering vibration characteristics because of this reason. In this research, we developed the device that generates asymmetric vibrations by using suction force generated by push-pull driven solenoids, and controlled the generated force by the electric current. In the experiment, Asymmetric vibration was generated by imputing an asymmetric current waveform from the function generator, and 7 men joined the experiment. As a result, we confirmed pulling illusion.

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  • Hiroki MURATA, Shinichiro SAWA, Isaku KANNO, Hirotaka HIDA
    Session ID: IIP1R1-E04
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    The plant-parasitic nematodes cause considerable damage to agricultural crops around the world. To develop an economy/eco-friendly new method for defending plants from the nematodes, we need to deeply understand the process of infection by the nematodes. In this paper, we present a new method for analyzing effects of external mechanical stress on the infection process of plant-parasitic nematodes, Meloidogyne incognita also known as root-knot nematode, by using a microfluidic device which have micropillar array. By using the contact analysis based on the finite element method, we numerically estimated the mechanical stress to a gall (root knot) applied by micropillars. Thanks to the developed analytical system, we have succeeded in observing infection process of nematodes in detail and found out how nematode will change cells of plants under suppression from micropillars. Those experimental results suggest that the mechanical stress might be able to suppress the growth of gall and finally prevent the root-knot nematode from breeding.

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  • Ryota SANO, Kentaro KOYAMA, Narumi FUKUOKA, Hidetaka UENO, Shohei YAMA ...
    Session ID: IIP1R1-E05
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    We propose a well structure to prevent cell from dropping out due to flow during liquid exchange for analyzing single cells on microarrays. As a result of FEM analysis of the flow field inside the proposed structure, it was found that the flow in the well transitions downward and is expected to hold the cells to the bottom of the well. Furthermore, microarrays were fabricated by 3D lithography technique and PDMS molding, and cell trapping was evaluated by experiments using actual cells. The experimental results showed that the proposed structure increased the number of cell trapping and decreased the cell dropping out to improve the efficiency of cell analysis.

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  • Ten SEKIGUCHI, Ryo ICHIGE, Hidetaka UENO, Takaaki SUZUKI
    Session ID: IIP1R1-E06
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    We propose a microfabrication method for UV-PDMS (ultra violet-curable polydimethylsiloxane), which can be fabricated by photolithography due to its material properties. However, the accuracy of the UV-PDMS microstructures fabricated by photolithography is inferior to that of the conventional photoresists. To improve the microfabrication accuracy of UV-PDMS, we investigated the solvent used to remove unexposed areas of photo-patterned UV-PDMS with the aim of selecting an appropriate solvent for microfabrication of UV-PDMS. The effect of the difference in solvent on the microfabrication accuracy of UV-PDMS was quantitatively evaluated.

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  • Yoshitaka ISHII, Koichi SAGWA
    Session ID: IIP1R1-F01
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In clinical medicine, blood collection is frequently performed, but there are risks such as blood infection and nerve damage. To solve these problems, automated blood collection is effective. In this study, we estimated the three-dimensional position of the artificial blood vessel in the artificial skin using conventional method and proposed one, and then compared the success of the automated puncture using a robot. The conventional method assumes that all light paths after refraction exist in the same plane. The proposed method assumes that the light paths after refraction are subdivided into smaller ones, which is closer to reality. The artificial skin and blood vessels used in the experiments were made of transparent and soft urethane resin and silicon tubes. The silicone tube was filled with black ink as simulated blood. The artificial skin and blood vessels were placed in arbitrary positions and postures. The posture was either horizontal or tilted ±10° around the vascular axis. After the artificial skin was placed, the three-dimensional position of the blood vessel was estimated by two methods, and automatic puncture operation was performed based on the estimated values. As a result, the puncture success rate of the conventional method was 33%, and that of the proposed method was 76%. The difference in success rate was especially large under the condition that the artificial skin was tilted.

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  • Ryoji MYOSE, Yuta SAKAKIBARA, Takeshi OKUYAMA, Mami TANAKA
    Session ID: IIP1R1-F05
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Recently, compression wear has been attracting attention for the purpose of improving physical functions during exercise. Various studies have been conducted to clarify the mechanism of improving fatigue reduction by compression wear. However, there is no common, definitive finding across many studies, since compression pressure and exercise conditions differ among studies. In this study, in order to elucidate the mechanism of the fatigue-reducing effect of compression wear, we focused on the hypothesis that compression wear can suppress muscle activity by reducing the vibration of soft tissues. We measure and analyze changes in the vibration propagation characteristics of the gastrocnemius muscle during calf raise exercise due to wearing compression socks. From the results, it was confirmed that wearing compression socks have influence on vibration intensity on body surface, muscle activity, muscle hardness and fatigue feeling. In the subjects whose feel reduction of fatigue, it was confirmed that muscle activity and vibration intensity were reduced by wearing the compression socks. It was suggested that the reduction of vibration on body surface contributed to the reduction of muscle fatigue by compression socks.

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  • Tomoki SUGIMOTO, Takeshi OKUYAMA, Mami TANAKA
    Session ID: IIP1R1-F06
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    The authors have developed a ring-type sensor system that focuses on the tension in the flexor tendons of the fingers in order to measure the force applied to the fingertips without interfering with the sensation at the fingertips. The flexor digitorum superficialis and flexor digitorum profundus are mainly involved in the flexion of the finger, and this sensor measures the combined force of the forces on each tendon. On the other hand, the mechanical model that represents the measurement principle of the sensor requires the tension applied to each tendon. In this study, we propose a method to measure the surface electromyogram during fingertip force generation in various finger postures, and to estimate the ratio of tension between the flexor digitorum superficialis and flexor digitorum profundus during fingertip force generation from the activity of each muscle. In order to determine this ratio, experiments were conducted to measure the relationship between joint angle and muscle activity. The results showed that the percentage of activity of the flexor digitorum profundus increased and the percentage of activity of the flexor digitorum superficialis decreased in the maximum voluntary muscle strength in proportion to the finger flexion angle.

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  • Masaki ASANO, Hiroshi MIURA, Yukihiro TERADA, Yoshihiro TANAKA
    Session ID: IIP1R1-F07
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In this paper, we present a wearable hardness sensor for internal examination. We have developed a wearable tactile sensor that allows conventional internal examination without impairing the user's sense of touch at the sensing. It is possible to adopt an appropriate sensing posture by the user's sensorimotor control. The developed sensor is based on the principle of acoustic reflection and evaluates the hardness of an object by the measurement of the pressure distribution through two acoustic paths with different hardness. The sensor was made with soft materials, making it suitable for internal examination from the standpoint of safety. Evaluation experiments using models of the cervix with different hardness showed that the developed sensor discriminated the hardness, indicating that the sensor might be available for internal examination.

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  • Misato ISHIKAWA, Yuko KOBAYASHI, Takamitsu SUNAOSHI
    Session ID: IIP1R2-D01
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    This paper examines the application of the sheet stacking technology by impellers to stack sheets like electrodes at a high speed without damage. We aim to develop a new simulation model for electrodes and to establish a method to design impellers. Stacking method by impellers is a way to stack sheets by inserting sheets in between impeller blades. Three-dimensional model of impellers was created by mechanism analysis software RecurDyn. We have selected an impeller model effective for damage-less stacking by defining damage and considering damage evaluation index. We have also investigated the relation between sheet parameters and impeller parameters by simulations and experiments.

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  • Yuta SASAMOTO, Toshimitu KANNDA, Yuta SUNAMI
    Session ID: IIP1R2-D04
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    A long, thin, continuous, flexible medium are commonly referred to as a web. Webs are often used as substrates in high-performance flexible devices. Roll-to-roll printed electronics production is expected to be the production method for these devices. However, there are still many problems. If the winding conditions are inappropriate, winding defects such as abrasions can occur. Slippage causes abrasion of the web, which damages the printed material. When the web is scratched, it loses its product value as well as other winding defects. In this study, the effects of winding speed and tension on the occurrence of slippage were investigated by varying the tension and speed in three steps. The modified Hakiel model proposed by Hashimoto et al. was used to compare the relationship between radial stress, interlayer air entrainment, interlayer frictional force and slip in the rolls with misalignment. As a result, it was confirmed that the amount of misalignment was the largest under the winding condition where the radial stress was the lowest. The amount of air entrainment increases under the condition of low internal stress. It is thought that the amount of misalignment increases because the frictional force between the web layers decreases.

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  • Yusaku ABE, Riki ORIMO, Yuri HIRAIWA, Yosuke OKAMURA, Yuta SUNAMI, Yu ...
    Session ID: IIP1R2-J01
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Pressure measurement method using pressure-sensitive paint (PSP) is gathering attention in the thermal and fluids engineering because it is possible to measure the pressure distribution on a model of interest. However, air brush coating, which is widely used as a method of applying PSP to a surface, has a problem that the pressure sensitivity depends on the skill of the person applying it. Therefore, there is a need to the development of a novel PSP application method. We have proposed pressure-sensitive nano-sheet (PSNS) based on fabrication methods of nano-sheets. In this study, we investigated the applicability of PSNS to pressure measurement. The pressure distribution induced by impinging jet was successfully measured by PSNS.

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  • Junya NARUSHIMA, Tomoji OHISHI, Mizue MIZOSHIRI
    Session ID: IIP1R2-J02
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Metal printing technique has attracted attention as a promising manufacturing method. To date, Cu patterning with high electroconductivity has been achieved by laser-reduced thermochemical precipitation in air using glyoxylic acid Cu complexes. However, it is difficult to fabricate thick Cu patterns due to their large volume shrinkage. In this study, we investigated the patterning properties of femtosecond laser patterning using a glyoxylic acid Cu (GACu) complex/Cu nanoparticle mixed ink. The Cu nanoparticle ink film was prepared by spin-coating a Cu nanoparticle ink on a glass or polyethylene naphthalate (PEN) substrate. Next, glyoxylic acid Cu complex ink was spin-coated onto the Cu nanoparticle ink film to produce glyoxylic acid Cu complex/Cu nanoparticle mixed ink film. After that, direct writing using green femtosecond laser pulses was performed in air. The wavelength, pulse duration, and repetition rate of the laser were 515 nm, 100 fs, and 40 MHz, respectively. The laser pulses were focused onto the samples using an objective lens with a numerical aperture of 0.45. The height of Cu pattern was 5.2 μm by single-scanning of the focused laser pulses. X-ray diffraction spectra showed the peaks corresponding to Cu on the both glass and PEN substrates. The resistance of the patterns was lower than that of the glyoxylic acid Cu complex ink. These results indicate that the Cu nanoparticles mixed with the GACu complex ink improved the density of the patterns with high film thickness. Such direct writing technique is expected to be used for fabricating flexible devices.

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  • Julien SAUVAGEOT, Takashiro TSUKAMOTO, Shuji TANAKA
    Session ID: IIP1R2-J03
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In this paper, a novel method to directly measure the microscale heat flux using stacked temperature sensitive paints (TSPs) is proposed. Two types of TSPs were combined with the optical filter, which enables to measure the temperature difference between the front and back side of the film, eventually the heat flux across the film. The measurement system was developed which independently activates each layer of TSP and measures the luminescence from them. The basic function of the developed method was experimentally demonstrated.

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  • Kanna MATSUMOTO, Yuta SUNAMI
    Session ID: IIP1R2-J04
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    We focused on producing porous nanosheets by using micropore processing on polymer ultrathin films (nanosheets), which are expected to be applied in the medical field. Nanosheets exhibit features such as high flexibility and high adhesiveness when the film thickness is 100 nm or less. In order to enable mass production of porous nanosheets, we adopted the roll nanoimprint method, which enables continuous processing. However, little research has been done on roll nanoimprint processing on nanosheets. In order to increase the transfer speed of the roll nanoimprint method and mass-produce porous nanosheets, it is necessary to establish a micropore processing method during low-speed transfer. Therefore, the production conditions for low-speed transfer using a calendar machine were examined while comparing with the micropore processing using a press machine. At that time, the type of nickel mold, the nanosheet material to be processed, and the clearance between the rollers were changed to perform microfabrication to produce a porous nanosheet. After preparation, observation was performed and evaluation was performed based on the presence or absence of micropores. As a result, it was found that the nanosheet material to be processed and the clearance affect the micropore processing.

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  • Takeki SHOJI, Toshimitsu KANDA, Yuta SUNAMT
    Session ID: IIP1R2-J05
    Published: 2022
    Released on J-STAGE: September 25, 2022
    CONFERENCE PROCEEDINGS RESTRICTED ACCESS

    Understanding the troughs caused during a heat treatment process is important for ensuring process stability and product quality in roll-to-roll (R2R) productions methodology. The purpose of this study is to confirm the relationship between heat and troughs during a transport process of heating where heat is applied over a wide range of area. The temperature and tension applied to the web during the heated transport process were measured in the experimental analysis. Results showed that the web were stretched in the web transport direction during the heat transfer process. However, troughs did not occur because the experiment was conducted below the glass transition temperature. The comparison between the web temperature obtained in the experimental analysis with the one-dimensional thermal conduction simulation for the temperature distribution of the web are also conducted in this paper. This simulation was performed using a non-Fourier model that can be used on microscales. Simulation results show that when the temperature is gradually raised, the amount of thermal conduction is reduced during transportation of the web. The thermal conduction of ballistic phonon is smaller than that of the diffuse phonon when compared at same distance. Even though there were differences between the experimental values and the simulation results, this is because it ignores the heat transfer and radiant heat transfer.

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  • Sarato NAKAMURA, Yuta SUNAMI
    Session ID: IIP1R2-J07
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In recent years, attention has been paid to the activity of Unmanned Aerial vehicles such as disaster site surveys and home delivery using drones. However, the current UAV cannot fly for a long time because of the influence of viscosity. The application of biomimetics is being considered to improve the performance of UAVs. Dragonflies are known to have high flight performance among flying organisms, and the fine structure existing in the wings of dragonflies is considered to be important. There are some types that can fly over 7100 km by using gliding flight. In this paper, we focused on the micro spike of about 100 μm on the wing surface of the dragonfly and performed computational fluid dynamics on changes in spike height using ANSYS FLUENT. As a result, It was confirmed that increasing the spike reduces the drag coefficient. It is thought that this is because the flow velocity is reduced by the micro spikes, which suppresses the growth of the vortex and reduces the pressure difference. From the above, it was considered that the pressure drag was reduced by the micro spikes. This consideration could be confirmed from the analysis results.

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  • Hiroyuki HARADA, Yusuke TAJIMA, Koichi SUWADA, Nozomi AKIYAMA, Yuto NO ...
    Session ID: IIP1R2-J09
    Published: 2022
    Released on J-STAGE: September 25, 2022
    CONFERENCE PROCEEDINGS RESTRICTED ACCESS

    We aim to use Ti-Ni based shape memory alloy (SMA) actuators as a new sound source by driving them in the audio frequency range. In this paper, we present the results of an experimental study on the driving conditions that maximize the output sound pressure for a single frequency input in the audio frequency range, especially the difference in response depending on the amount of strain of SMA. The results of sound pressure measurements using a microphone indicated that the magnitude of the response depended on the amount of strain of the SMA, and that in most cases the response could be maximized by maintaining the strain in the middle range where phase transformation occurs.

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  • Kazuki KIRIYAMA, Teppei ARAKI, Mihoko AKIYAMA, Ashuya TAKEMOTO, Takafu ...
    Session ID: IIP1R2-J12
    Published: 2022
    Released on J-STAGE: September 25, 2022
    CONFERENCE PROCEEDINGS RESTRICTED ACCESS

    In recent years, wearable devices are increasing needs to process large amounts of bio-signals for digital healthcare. However, conventional rigid device causes damage to biological tissue during long-term wearing. And conventional cloud AI signal processing has problems on network load. Here, this study shows a flexible organic memory with low power consumption toward an imperceptible wearable sensor that efficiently performs onsite AI signal processing. The organic memory in a total thickness of 3 μm comprises an organic semiconductor and electrodes on Parylene substrate, which exhibits bending durability, linearly multi-valued memory, and low writing energy. The memory characteristic variated with connecting load resistances is related with the time constant that is calculated with total resistance and total capacitance in the device. The relationship is important when the organic memory that behaves like synapse is implemented in a circuit of AI computing. Furthermore, the synapse behavior of the organic memory is successfully utilized to measure biological signals. In the future, flexible sensors using in-memory computing can contribute to efficient on-site diagnosis under long-term attachment to the skin or clothing.

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  • Mizuki Morikawa, Yasushi Shibata, Gen Hashiguchi
    Session ID: IIP1R3-I04
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    This paper proposes and demonstrates an electret MEMS switching device in purpose of voltage regulation of the charging voltage to be used in a vibration power generator system. The device can be operated with almost zero current consumption; hence it will be applicable to a vibration power generating system under low current generation conditions.

    We have successfully regulated the charging voltage around 14V with the MEMS switching device having 240V electret potential.

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  • Ichihiro FUKUSHIMA, Junho CHOI
    Session ID: IIP1R3-I05
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In this study, we have designed a monitoring sensor for bicycles using a self-powered triboelectric nanogenerator (TENG). We found that the speed and the weight of the bicycle, and the pressure of tires show a strong relationship with TENG outputs, and the amount and waveform of TENG output voltage can be used for the sensing parameters. We also discussed the mechanism of TENG output using COMSOL Physics simulation.

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  • Teramoto Daiki, Naoya Iwamoto, Isaku KANNO
    Session ID: IIP1R3-I07
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In this study, we fabricated flexible piezoelectric energy harvesters (PEHs) from Pb(ZrTi)O3 (PZT) thin films on stainless steel foils for wearable applications. The PZT thin films were deposited on Pt/Ti-coated stainless steel substrates of 30 μm by RF-magnetron sputtering. We measured output power by large bending deformation applied to PEHs. During periodic bending motion, the maximum output power of 166.7 μW was measured from the effective area of 380 mm2 at a load resistance of 80 kΩ. We also fabricated PEHs of lead-free (Kx, Na1-x)NbO3 (KNN) thin films on stainless steel foils and evaluated the electrical characteristics.

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  • Tomoya MORIKAWA, Kiyoshi MATSUMOTO
    Session ID: IIP1R3-I08
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    The purpose of this research is to propose a piezoelectric vibration type sensor that approaches the dynamic range of humans. The proposed sensor uses a 58 mm long cantilever as a substrate and mounts a piezoelectric vibrator near the support point of the cantilever to create the sensor. This sensor uses one vibrator to generate vibrations and the other vibrator to output a voltage, changing its natural frequency to measure mass. In the experiment, a weight was placed 8 mm from the tip of the cantilever and the change in vibration amplitude was measured. After that, the same procedure was performed at a location 28 mm from the tip. As a result, there was no difference in the change in vibration amplitude depending on where the weight was placed, but the change in vibration amplitude was confirmed. In the future, we will improve the proposed sensor with the aim of expanding the dynamic range.

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  • Saho IKEDA, Masaya HATANAKA, Shinji KOGANEZAWA, Shohei KAWADA, Renguo ...
    Session ID: IIP1R3-I09
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In Japan, the percentage of old road bridges will rapidly increase because of the numerous road bridges constructed during the 1960s and 1970s; therefore, an efficient method for diagnosing the soundness of bridges is required. We are developing a vibration-sensing device for a self-powered structural health monitoring system that diagnoses soundness from changes in the vibration characteristics of bridges. In this research, we considered the increase in the power generation capacity to obtain larger energy from the bridge vibrations. Field test results confirmed that the amount of power generation per hour was 51.0 [mJ].

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  • Kosei MATSUBARA, Katsuhiko SAKAI, Hiroo SHIZUKA
    Session ID: IIP1R3-I10
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Eddy current sensors are generally used for measurement of flat surfaces. However, they have not been applied to cylindrical inner diameter surfaces such as after boring, and it is not known how concave surfaces affect the measurement. In this study, the effects of the material and inner diameter of the workpiece on the measurement accuracy in inner diameter turning were investigated from the perspective of experiments in which an eddy current sensor was actually mounted on a machine for measurement and FEM analysis. As a result, it was found that changes in the curvature of the inner surface affected the dimensional measurement.

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  • Daiki ONO, Kei MASUNISHI, Etsuji OGAWA, Ryunosuke GANDO, Hiroki HIRAG ...
    Session ID: IIP1R3-I11
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    We have developed a compact system for real-time absolute tilt angle measurement with high accuracy. The compact module of MEMS differential resonant accelerometer (DRA) that can achieve both high accuracy and wide dynamic range was utilized in the system. Using the prototype system, the tilt angle measurement with an estimated accuracy of less than 1 mdeg was realized.

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  • Yoshihiro HAGIGARA, Shunki MORIUCHI
    Session ID: IIP1R3-I12
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In recent years, AR games for smartphones have become popular, and the overall market for AR games is expanding. As a result, the demand for the development of systems for AR games is expected to increase in the future. In this research, we aim to develop a system that can be used in AR games for smartphones. Using a monocular image depth estimation method based on cycle GAN, which exist as prior research, rather than images from special cameras such as stereo cameras, we identify the coordinates of actual structures in the game space and develop a 3D object placement system based on these coordinates using Unity. As a result, For the depth estimation method, the accuracy of the RMSE was better than that of previous studies. In addition, we were able to construct a 3D object placement system using depth images and segmentation on Unity Engine.

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  • Toshikazu TAKI, Chiayu LIN, Tsubasa KUSAKA
    Session ID: IIP1R3-I14
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Many infrastructure facilities are aging, and the number of such facilities will increase in the future. The maintenance and renewal of aging facilities entails a large expenditure. Therefore, it is necessary to automate maintenance and preventive maintenance based on the data collected by IoT technology. However, collecting data from analog and digital meters that do not have an external output is a problem. To solve this problem, we have developed a technology to read meters based on images acquired from a camera. Since there are various types of meters, we decided to separate the shape search and the reading process, and connect them with plug-ins. In addition, we have developed and evaluated a method for correcting the orthogonality of the search for circular and rectangular meters, and confirmed that it improves the reading accuracy.

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  • Misachi NODA, Yoshihiro HAGIHARA
    Session ID: IIP1R3-I15
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In recent years, there has been a huge amount of music information in this world, and classification methods for the purpose of music retrieval are being studied. In addition, the visual effect of stage lighting at concerts and other events can be an element that conveys the image of the music. The use of stage lighting requires knowledge of lighting, color, and music, as well as humen resources, and is a time-consuming task for some performance groups because it requires advance setup. The purpose of this research is to create an opportunity learning model to recommend lighting colors that match the music. In addition, we will examine music classification methods based on musical tones and visualization of music information according to emotions.

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  • Kosuke KIMURA, Katsuhiko SAKAI, Hiroo SHIZUKA, Kazuoki SASAKI
    Session ID: IIP1R3-I16
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Tool changes in the cutting process are mainly constant changes based on the results of experiments conducted in advance. However, due to the variation in the wear progress of different tools, tools that can be used sufficiently are resharpened or replaced, resulting in waste. Therefore, monitoring during the cutting process has been actively researched for the purpose of avoiding wasteful tool changes. In this study, the relationship between sound signals generated during drilling of SUS630 and tool damage was experimentally investigated in order to construct a tool damage detection system using cutting sounds. In the experiment, the cutting noise during drilling was captured by a camera installed inside the machine tool. Data processing such as Fast Fourier Transform was performed on the obtained cutting sound data, and the correlation between the characteristics of the cutting sound and tool damage was investigated. As a result, it was confirmed that the component around 1000[Hz] increased as the wear progressed, while the component around 1750[Hz] was dominant for new tools. In addition, machine learning was conducted using the cutting sounds of the new and worn tools as supervisory data, and it was examined whether the damage state of the drill could be determined.

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  • Yoshihiro HAGIHARA, Kaine NAKAMURA
    Session ID: IIP1R3-I17
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Human motion recognition is a widely known research topic in computer vision. In supervised learning of motion, it is necessary to collect and label a huge amount of data for training. We thought that labeling could be done efficiently by automatically dividing the collected data into several patterns in advance when preparing the teacher data. We extracted the features of the motion data of the flag-raising play using the convolutional autoencoder, and clustered using the Infinite Hidden Markov Model. We use motion capture to measure flag-raising play, and PERCEPTION NEURON is used for motion capture. The flag-raising play consists of raising and lowering the left hand and raising and lowering the right hand. The accuracy of the convolutional autoencoder has been improved by updating the model of the convolutional autoencoder and the preprocessing of the data. we got closer to the number of correct tags by updating the model of the convolutional autoencoder from the result of Infinite Hidden Markov Model.

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  • Kyosuke Ono
    Session ID: IIP2R1-A03
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In order to increase the recording density of magnetic disks, it is necessary to achieve a condition in which the gap between the head and the disk can be kept below 1nm with high reliability. For this purpose, it is important to clarify the mechanism of the touchdown (TD) phenomenon of the head, and to develop a method to move the head back off the disk. The author has already studied the TD characteristics of a one-degree-of-freedom slider model in which the air bearing force and the contact force act together with adhesion forces of the van der Waals force and the nano-meniscus force. In the present study, it is clarified that various TD phenomena including surfing state can be understood by considering that sliding contact on nano-asperities with monolayer lubricant causes lifting force and decreases surface attraction.

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  • Katsuaki Shirai, Mizuki Sakamoto, Beomzu Kim
    Session ID: IIP2R1-A04
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    We focus on complex flow existing in hard disk drive used as information storage device. Fast revolution of thin disks drive the fluid inside an enclosure. The resulting rotating flow passes through complex geometry inside the drive and hence the flow exhibits unsteady three-dimensional behavior. In the past research, we have observed the behavior using flow visualization, and the velocity statistics have been obtained based on particle image velocimetry (PIV). However, some of the statistics are coordinate-dependent and their interpretation remains difficult. In the present study, we attempt topological understanding of the flow stuructures based on tensor invariants. We calculated two-dimensional invariant maps of flow velocities obtained by two-dimensional PIV measurements. In the topological analysis, we found out that there is a certain implication of the instable states on a quadrant region with disturbance by the insertion of an arm into the rotating flow.

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  • Ken OZAWA, Takumi ISHIKAWA, Shigehisa FUKUI, Hiroshige MATSUOKA
    Session ID: IIP2R1-A05
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Atomic force microscope (AFM) has been widely used to evaluate the surface interaction between two surfaces in micro/nanoscale, and they are measured by the deflection of the cantilever at the end by the optical lever method. Because the optical lever method measures the deflection of the cantilever by its deflection angle, a measurement error occurs between them. To fix the error, analyses on the vibration characteristics of the cantilever are necessary. In this study, vibration characteristics of AFM optical cantilever with surface forces acting on the tip were analyzed. Surface forces were introduced by assuming a spring and damping acting at the end of the cantilever. The vibration characteristics of the cantilever were analyzed by solving the equation of motion with various spring constants and damping coefficients. Furthermore, the air film squeeze force was derived from the molecular gas-film lubrication (MGL) equation, and vibration analysis was performed considering the case where the air film squeeze force and van der Waals force act as surface forces. They were introduced into the equation in the form of the spring constant and the damping coefficient. In the result, the amplitude ratio and the phase shift derived from the optical lever method were shown with respect to the curvature radius of the cantilever tip.

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  • Koya INAYOSHI, Takumi AOTO, Xingyu CHEN, Hedong ZHANG, Kenji FUKUZAWA, ...
    Session ID: IIP2R1-A06
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Using molecular dynamics with our developed reactive force field, we investigated the effect of water and/or oxygen on the mechanochemical reaction of nanometer-thick perfluoropolyether D-4OH films at the head–disk interface of heat-assisted magnetic recording. The simulation results showed that the presence of oxygen, water, or both accelerated the mechanochemical reaction of D-4OH. For oxygen only, no decomposition reaction occurred, and oxidation reactions were observed in which an oxygen molecule was inserted between the C–C bond in the end group of D-4OH. In contrast, in the presence of water, hydrolysis decomposition reactions at the C–O bond in the end group of D-4OH occurred frequently, and polymerization reactions were also observed.

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  • Junya KABA, Tomoko HIRAYAMA, Naoki YAMASHITA, Masahiro HINO, Norifumi ...
    Session ID: IIP2R1-A07
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Organic Friction Modifier additives are widely used to reduce friction and wear on sliding surface. In this study, we investigated the effect of different sliding conditions, such as surface roughness, surface pressure, and medium, on the friction reduction effect of adsorption films with different surface coverage, and examined the factors that affect the frictional properties of adsorption films. To investigate the effect of the different packing densities on the frictional properties of the adsorption films, we firstly prepared adsorption films with the same tip group but different packing densities by the LB method, and confirmed the validity of the preparation of the LB films by neutron reflectometry. The friction properties of the adsorption films were measured under the different surface roughness and pressure using atomic force microscopy. The results suggest that there is an optimum packing density for surface pressure and surface roughness.

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  • Masahiro YANAGISAWA, Masahiro KUNIMOTO, Morten BERTZ, Takayuki HOMMA
    Session ID: IIP2R1-A08
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Heat-Assisted Magnetic Recording (HAMR) is expected as one of the future high density recording technologies. When the magnetic film is heated at Curie temperature (Tc) around 600K (357 degree Celsius) for CoPt system with a near-field transducer (NFT), carbon overcoat film (COC) and lubricant film are also heated. Therefore, thermal life estimation of these thin films is strongly requested. We have developed new measurement systems based on surface-enhanced Raman spectroscopy (SERS). Our measurement tool composed of a transmission-type plasmonic sensor (TPS) has ultra-high sensitivity of 370,000 times greater than that of the normal Raman spectroscopy in magnitude to measure chemical structures and film temperature. Heating temperature can be measured by intensity ratio of anti-Stokes to Stokes peaks in SERS spectra. We report the life estimation of COC and lube film from Raman spectral change by heating emulation using plasmonic sensor array (PSA) with 2.5” disk drive with 10,500 rpm. As a result, no degradation was observed on COC and lubricant film after laser heating for typical HAMR condition at 350 degree Celsius.

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  • Masahiro YANAGISAWA, Masahiro KUNIMOTO, Morten BERTZ, Takayuki HOMMA
    Session ID: IIP2R1-A09
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Heat-Assisted Magnetic Recording (HAMR) is expected as one of the future high density recording technologies. When FePt magnetic film for future recording material is heated at Curie temperature (Tc) around 850K (577 degree Celsius) with a near-field transducer (NFT), carbon overcoat film (COC) and lubricant film are also heated. Therefore, resistance for thermal damage of these thin films is much more requested than that for CoPt magnetic film (600K, 327 degree Celsius of Tc). We have examined a variety of COC materials by using new measurement systems, i.e. power scanning tool, based on surface-enhanced Raman spectroscopy (SERS). Our measurement tool composed of a transmission-type plasmonic sensor (TPS) can measure chemical structure of ultra-thin films with atomic scale with ultra-high sensitivity of 370,000 times greater than that of the normal Raman spectroscopy in magnitude. A variety of diamond-like carbon (DLC) films and graphene monolayer film have examined on critical temperature (CT) where the temperature at which intensity ratio of D peak to G peak (I(D)/I(G)) start increasing. As a result, best material is Graphene overcoat (GOC) with the CT of 1000 degree Celsius and more. The GOC is expected for higher recording density because of ultra-thin film (thickness of 0.3nm).

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  • Masahiro YANAGISAWA, Masahiro KUNIMOTO, Morten BERTZ, Takayuki HOMMA
    Session ID: IIP2R1-A10
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Heat-Assisted Magnetic Recording (HAMR) is expected as one of the future high density recording technologies. When lubricant film is heated in HAMR, degradation occurs by heating. Decomposed lubricant creates viscous stuff (smear) on head or magnetic disk surface. Smear can cause head crush. Degradation mechanism is studied from a view point of thermal, catalytic, and tribochemical reaction of Co, one component of CoPt alloy system in magnetic recording media. Two decomposition reactions of Z-Tetraol lubricant, i.e. perfluorinated polyether with 4 hydroxyl groups, are observed. Carbonization subsequent to oxidation occurs with increasing laser power. Temperature at critical laser power of carbonization decreases for Co(OH)2 < Co on laser heating in ascending order. Oxidation reaction is not observed in N2 environment. Decomposition of lubricant is observed on diamond-like carbon (DLC) film on CoPt film on hard disk media in laser heating and in sliding. As a result, the following mechanism is considered. Co(OH)2 is created on the disk surface following Co ion migration through DLC film and reacted with H2O. Co(OH)2 changes to Co oxides (CoO or Co3O4) which is known as active catalyst. Sliding accelerates the decomposition of lubricant by tribochemical reaction.

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  • Tatsuhiko NISHIDA, Hiroshi NAKAYAMA, Masao HANYA
    Session ID: IIP2R1-B01
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    The Amount of digital data being generated is increasing dramatically. The data generation in a year worldwide is expected to reach about 175 zettabytes in 2025, and the demand for data recording devices is expected to continue to increase. In order to increase the recording capacity of a hard disk drive (HDD), it is important to increase the data track density, and for that purpose, highly accurate head positioning performance is required for the HDD. In recent HDDs, PZTs are mounted on a suspension that supports the head to accurately control the position of the head. Especially in high capacity HDDs, the PZTs are located on the flexure near the head for more accurate positioning. However, in this structure, the actuation of PZT can cause the flexure to vibrate which could lead to a deterioration in the positioning performance. In this paper, in order to reduce the vibration of flexure in the HDD suspension, we conducted an experiment to attach a damper to the flexure. The damper was able to remarkably reduce the vibration of slider under 20kHz without a significant increase in the stiffness of the flexure. Moreover, in a shock test, the damper suppressed the deformation of the flexure, and reduced deterioration of the vibration characteristics.

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  • Takehiko EGUCHI
    Session ID: IIP2R1-B02
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    This paper proposes an acceleration trajectory by using polydyne curves to ramp up and down, which suppresses the residual vibrations related to multiple resonant modes. The polydyne curve is an optimal cam profile that does not excite residual vibrations due to the follower's resonant mode, and it can be applied to a feedforward input for a positioning control. The acceleration and position trajectories are used as a feedforward input in the two-degree-of-freedom controller. For long motion, the acceleration trajectory often dwells at its maximum value in its acceleration and deceleration sections and changes quickly between them. The instantaneous onset of the acceleration makes a large vibration, and suppressing the transient vibration is an important issue on high-speed and high-precision positioning control. The proposed acceleration trajectory with polydyne curve can suppress the transient vibrations; Fifth-order polydyne ramp can suppress one resonant mode, and ninth-order polydyne ramp can do two modes. In addition, another mode can be suppressed by canceling vibrations generated at the beginning and end of the ramp section with each other. A simulation study using a mechanical model which has three resonant modes demonstrated that the proposed acceleration trajectories suppressed the residual vibration completely.

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  • Zixiang MAO, Keiichi WATANUKI, Kazunori KAEDE
    Session ID: IIP2R1-B04
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    For the traffic sign recognition problem in the advanced driving assistance system (ADAS) and self-driving system, this study uses YOLO, one of the deep learning methods of target detection, to detect traffic signs based on the Chinese traffic sign dataset TT100K and the self-made Japanese traffic sign dataset. In addition, by introducing attention mechanism into YOLO model, the recognition performance of traffic signs is improved. Subsequently, using the weights trained from the TT100K of the large Chinese traffic sign dataset, the self-made Japanese traffic dataset is trained by the method of fine-tuning of transfer learning. The experimental results show that the convergence speed of the model using transfer learning is improved and a better recognition effect is obtained.

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  • Aoki TOYOSHIMA, Hiroshi HASEGAWA
    Session ID: IIP2R2-G01
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In order to add the Kansei value of designers in product design, it is necessary to resolve the requirements consisting of Kansei value of designers, customer needs and limiting constraints without contradiction and reflect them in product design. In regard to this problem, the shape and layout creation system that considers the Mechanical Kansei has been developed. This system can create a discriminant function using TDNN (Time Delay Neural Network) based on the EEG(electroencephalogram) information obtained by the EEG measurement device EPOC+ and construct the layout of the shape using the fully stressed design method. On the other hand, it is important for the designer to validate the shape created based on Mechanical Kansei for the shape and layout creation system. Therefore, we will develop a shape evaluation system and confirm the designer’s satisfaction with the shape. For shape and layout evaluation, we propose an evaluation system using Mechanical Kansei and prospective expectation that can be obtained from the left prefrontal cortex and for Kansei value improvement. As a result, it showed that shape evaluation using Mechanical Kansei and positive expectation was possible, but the accuracy decreased depending on the requirements that the designer considered important.

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  • Ryo TAKAHASHI, Makoto KUROSAWA, Yasuhiro MATSUI
    Session ID: IIP2R2-G02
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    The purpose of this paper is to propose an evaluation method using Machine learning for grading the appearance of wrinkles on Household-Washer-Dried Clothes. Initially, in order to evaluate the strong wrinkles caused by twisting and tangling of the garments, the sensory evaluation was carried out on the images of clothes after drying using our own standard samples. Then, machine learning was carried out using the garment images and sensory evaluation values as teacher data. The Xception model was adopted as the learning model. As a result of applying the conventional visual sensory evaluation and this proposed system to cotton Y-shirts, the estimated evaluation value by this method is highly correlated with the sensory evaluation value, and the caluculation of the AUC values shows that this system has the same performance as the conventional sensory evaluation. Therefore, this system provides a more objective quantitative evaluation of the wrinkles of clothes obtained by washing and drying.

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  • Takuma NISHIOKA, Yoshihiro HAGIHARA
    Session ID: IIP2R2-G03
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In this paper, we propose a fire detection method based on machine learning. In the proposed method, fire detection is performed when the accumulated time is exceeded by the result of correcting the sensor output by the correction factor corresponding to the result of discriminating the three states of fire, non-fire, and monitoring by machine learning. In the machine learning method, we learn the correspondence between the variance values of the sensor outputs of smoke, heat, and CO obtained by experiments and the teacher labels. Two patterns of machine learning methods, Random Forests and Alternating Decision Forests, were tested. For the validation, we used 47 trials of fire data and 27 trials of non-fire data for training, and 41 trials of fire data and 25 trials of non-fire data for testing. The proposed method reduces the detection time by 76.16 seconds per data in the fire experimental data, and reduces the number of false positives by 5 trials in the non-fire experimental data.

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  • Hiraku KOMURA, Kyohei YAMASHITA, Masahiro OHKA
    Session ID: IIP2R2-G04
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    To develop the technology which provide someone with the texture sensation, we have investigated the Velvet Hand Illusion (VHI). VHI is an illusion phenomenon in which a smooth surface sensation is induced when two parallel steel wires are sandwiched between two palm of hands and rubbed back and forth. So far, we clarified that VHI also occurs in the dot matrix displays in psychophysical experiment, but we did not clarify its mechanism. In this study, to clarify the mechanism of VHI from the viewpoint of brain science, we conducted a measurement experiment of the brain activation state at the time of VHI occurrence using LABNIRS.

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  • Shotaro AMINO, Yasutomo NAKABAYASHI, Naoaki TSUDA, Yoshihiko NOMURA, N ...
    Session ID: IIP2R2-G05
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    Various wearable devices for body movement instructions have been developed, however, the user sometimes suffers from a sense of restraint because of the structures of such devices. The authors proposed a novel instruction device with a pendulum that is attached to a tool, not to the user’s body, that is, this device does not restrain the user’s body movement. The center of gravity of the device that is attached to the tool translates by swinging the pendulum, and the user is expected to perceive a guiding force as if the user’s body is moved by an external guiding force. In this paper, the proposed device was applied to a calligraphy brush motion, and effective configurations of the device was explored through experiments.

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  • Takumi TAKESHIGE, Hiraku KOMURA, Masahiro OHKA
    Session ID: IIP2R2-G06
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In order to develop wearable devices to evaluate dexterity, we apply two illusions such as cutaneous and stick rabbit illusions. In both rabbit illusions, we found that illusion intensity increases with increase of stimuli distance. Furthermore, we found the negative correlation between illusion intensity and time difference of stimuli in cutaneous rabbit illusion, while we found positive correlation between them in stick rabbit illusion. Finally, based on questionary about dexterity we found considerably large correlation between correlation factor magnitude and dexterity score summation in both rabbit illusions. Consequently, we confirmed that our two devices have ability to evaluate dexterity.

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  • Yandong CHEN, Keisuke WATABABE, Hiraku KOMURA, Masahiro OHKA
    Session ID: IIP2R2-G07
    Published: 2022
    Released on J-STAGE: September 25, 2022
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    In our previous paper, we reported the three-axis tactile sensor worn by human fingernail to record distinguished person’s manipulation. The tactile sensor is based on fingernail color change caused by applied force. In this study, we examine the sensing precision of tangential force, which is frequently caused by tasks of nursing and ceramic art. In the experiments, 10 human subjects wore the tactile sensor on their index fingertip to vary direction of tangential force from 0° to 360° in 30° increment. Then, CNN learned fingernail image data associated with three-axis force components. As result of this learning, maximum error of tangential force direction was 5°.

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