• Title/Summary/Keyword: tactile research

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Development of a Tactile Sensor Array with Flexible Structure Using Piezoelectric Film

  • Yu, Kee-Ho;Kwon, Tae-Gyu;Yun, Myung-Jong;Lee, Seong-Cheol
    • Journal of Mechanical Science and Technology
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    • v.16 no.10
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    • pp.1222-1228
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    • 2002
  • This research is the development of a flexible tactile sensor array for service robots using PVDF (polyvinylidene fluoride) film for the detection of a contact state in real time. The prototype of the tactile sensor which has 8${\times}$8 array using PVDF film was fabricated. In the fabrication procedure, the electrode patterns and the common electrode of the thin conductive tape were attached to both sides of the 281$\mu\textrm{m}$ thickness PVDF film using conductive adhesive. The sensor was covered with polyester film for insulation and attached to the rubber base for a stable structure. The proposed fabrication method is simple and easy to make the sensor. The sensor has the advantages in the implementing for practical applications because its structure is flexible and the shape of the each tactile element can be designed arbitrarily. The signals of a contact force to the tactile sensor were sensed and processed in the DSP system in which the signals are digitized and filtered. Finally, the signals were integrated for taking the force profile. The processed signals of the output of the sensor were visualized in a personal computer, and the shape and force distribution of the contact object were obtained. The reasonable performance for the detection of the contact state was verified through the sensing examples.

Analysis of Friction Signals Based on Sliding Tests with Finger for Tactile Sensibility (촉감 감성 해석을 위한 미끄럼 마찰 시험과 신호 분석)

  • Park, JinHwak;Park, SeMin;Sesaldo, May Grace;Lee, YoungZe
    • Tribology and Lubricants
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    • v.29 no.3
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    • pp.167-170
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    • 2013
  • The friction behavior of human skin is determined by the complex interplay of the material and surface properties of the skin, as well as the contacting material, and strongly depends on the contact parameters (e.g., pressure and sliding velocity) and the presence of substances such as water, sweat, or skin surface lipids at the interface. Including a study on the effect of a surface's physical roughness for skin sliding over the surface, various studies have been conducted to understand human tactile sensibility. However, to investigate products in relation to human tactile sensibility, more objective research is needed. This study performed sliding experiments between the skin and the surfaces of phone cases to understand how the texture, friction, and stick-slip characteristics are related. Eight phone case surfaces with different topologies and chemical (or mechanical) compatibilities with skin were prepared and tested multiple times.

A Biomimetic Artificial Neuron Matrix System Based on Carbon Nanotubes for Tactile Sensing of e-Skin (인공촉각과 피부를 위한 탄소나노튜브 기반 생체 모방형 신경 개발)

  • Kim, Jong-Min;Kim, Jin-Ho;Cha, Ju-Young;Kim, Sung-Yong;Kang, In-Pil
    • Journal of Institute of Control, Robotics and Systems
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    • v.18 no.3
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    • pp.188-192
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    • 2012
  • In this study, a carbon nanotube (CNT) flexible strain sensor was fabricated with CNT based epoxy and rubber composites for tactile sensing. The flexible strain sensor can be fabricated as a long fibrous sensor and it also may be able to measure large deformation and contact information on a structure. The long and flexible sensor can be considered to be a continuous sensor like a dendrite of a neuron in the human body and we named the sensor as a biomimetic artificial neuron. For the application of the neuron in biomimetic engineering, an ANMS (Artificial Neuron Matrix System) was developed by means of the array of the neurons with a signal processing system. Moreover, a strain positioning algorithm was also developed to find localized tactile information of the ANMS with Labview for the application of an artificial e-skin.

Effect of Multimodal cues on Tactile Mental Imagery and Attitude-Purchase Intention Towards the Product (다중 감각 단서가 촉각적 심상과 제품에 대한 태도-구매 의사에 미치는 영향)

  • Lee, Yea Jin;Han, Kwanghee
    • Science of Emotion and Sensibility
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    • v.24 no.3
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    • pp.41-60
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    • 2021
  • The purpose of this research was to determine whether multimodal cues in an online shopping environment could enhance tactile consumer mental imagery, purchase intentions, and attitudes towards an apparel product. One limitation of online retail is that consumers are unable to physically touch the items. However, as tactile information plays an important role in consumer decisions especially for apparel products, this study investigated the effects of multimodal cues on overcoming the lack of tactile stimuli. In experiment 1, to explore the product, the participants were randomly assigned to four conditions; picture only, video without sound, video with corresponding sound, and video with discordant sound; after which tactile mental imagery vividness, ease of imagination, attitude, and purchase intentions were measured. It was found that the video with discordant sound had the lowest average scores of all dependent variables. A within-participants design was used in experiment 2, in which all participants explored the same product in the four conditions in a random order. They were told that they were visiting four different brands on a price comparison web site. After the same variables as in experiment 1, including the need for touch, were measured, the repeated measures ANCOVA results revealed that compared to the other conditions, the video with the corresponding sound significantly enhanced tactile mental imagery vividness, attitude, and purchase intentions. However, the discordant condition had significantly lower attitudes and purchase intentions. The dual mediation analysis also revealed that the multimodal cue conditions significantly predicted attitudes and purchase intentions by sequentially mediating the imagery vividness and ease of imagination. In sum, vivid tactile mental imagery triggered using audio-visual stimuli could have a positive effect on consumer decision making by making it easier to imagine a situation where consumers could touch and use the product.

Clinical Study on the Relations of the Refineness and the Tactile of Back Skin of the Hand to Sasang Constitutions depending on sex and age (연령 및 성별에 따른 사상체질별 손등 피부의 조직 세밀도 및 감촉 특성에 대한 임상 연구)

  • Lee, Su-Heon;Joo, Jong-Cheon;Yoon, Yoo-Sik;Kim, Jong-Yeol
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.19 no.2
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    • pp.536-543
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    • 2005
  • We statistically analyzed the relationship between the constitution and the refineness and tactile of skin depending on sex and age, using 1079 clinical data registered to SCIB(Sasang constitution Information Bank), and the following results are obtained: The thickness of skin has big discrimination ability in classification of Taeeumin and Soyangin, especially in women and in ages 21 or more. The stiffness of skin also has big discrimination ability in classification of Taeeumin and Soeumin, especially in Taeumin women and Soeumin man and in ages 21-60. The differences stated above have been proved to be meaningful enough by Chi-square test.

Tactile Type Hangul Identification System the Blind(1) (시각장애자용 촉각식 한글판독장치(1))

  • Kim, Hong-Oh;Min, Hong-Gi;Huh, Woong
    • Journal of Biomedical Engineering Research
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    • v.12 no.2
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    • pp.107-112
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    • 1991
  • In this paper, we have developed page level input system of the character reading aid for the blind. Input toys)ems arse consisted with 512 pixels line image sensor, optical lento, digital interface for the computer and its control software. Input buffer size of the computer memory that for the single scanning of printed matters Image is 64kB. Image patterns of the reading characters which stored in system memory are converted to tactile character patterns that would be output to the bimorph tactile sensor by software control.

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Recognition of object in the robot gripper using tactile sensor (접촉센서를 이용한 로보트 gripper 내의 부품의 형상인식)

  • 윤지섭;이재설;박병석
    • 제어로봇시스템학회:학술대회논문집
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    • 1988.10a
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    • pp.422-427
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    • 1988
  • The purpose of this research is to develope a algorithm characterizing the grasp of the randomly fed objects using the tactile sensor. The tactile sensor used is composed of the 10 x 16 arrays of optical sensors and the planar resolution is 1.8 x 1.8 mm$^{2}$. The square and circular plate are used for the investigation of the characteristics of this sensor. The result shows that the measuring performance of the square plate is superior to that of the circular plate. Based upon this result the algorithm for the assembly of the electric plug was developed and was implemented using the mini-robot.

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Comparison of contacting and non-contacting methods in measuring the surface roughness of texture (섬유의 거칠기 측정에 있어서 비접촉식 방식과 접촉식 방식의 비교)

  • 박연규;강대임;송후근;권영하
    • Science of Emotion and Sensibility
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    • v.2 no.1
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    • pp.105-111
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    • 1999
  • In order to introduce the touch to engineering and industries, it must be preceded to dstablish a quantitative barometer of the feeling. for this purpose, we developed a tactile measuring system to measure physical properties of texture, such as surface roughness, friction coefficient and compliance. The tactile measuring system uses a LASER type displacement sensor, which is a non-contacting system, in measuring the surface roughness. By considering that human tactile system is a contacting mechanism, this non-contacting method needs to be modified. As a precedent research of that, we compared the contacting and non-contacting method in this paper. Surface roughness of ten cloths were measured by using the measuring system, then compared to the test results using the Kawabata evaluation system(KES), which uses a contacting method in measuring the surface roughness.

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Distributed Flexible Tactile Sensor System Using Piezoelectric Film

  • Yoon, Myoung-Jong;Yu, Kee-Ho;Kwon, Tae-Gyu;Lee, Seong-Cheol
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.61.4-61
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    • 2001
  • This research is the development of a distributed flexible tactile sensor for service robots using PVDF (polyvinylidene fluoride) film for the detection of the contact state in real time. The tactile sensor which has 8$\times$8 taxels is fabricated using PVDF film and flexible circuitry. The proposed fabrication method is simple and easy to make the sensor in the laboratory without using any special equipment. Experimental results on static and dynamic properties are obtained. In order to investigate the properties of the sensor, the sensor output to the arbitrary forces and frequencies are measured using the shaker with the force sensor.

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A method of effective tactile information display using smart devices (스마트 단말을 이용한 효과적인 촉각정보 표시 방법)

  • Yun, Sung-Jo;Seo, Kap-Ho;Kim, Dae-Hee;Park, Yong-Sik;Park, Sung-Ho;Jeon, Kwang-Woo;Jeon, Jung-Su
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2014.07a
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    • pp.53-54
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    • 2014
  • 본 논문에서는 시각 장애인들을 위해 유용한 정보를 제공해 주기 위한 촉각표시장치의 효율적인 정보 표시 방법에 대해 제안한다. 이 방법은 전방에 장애물이 있을 경우 이를 인지 및 촉각 정보로 변환하여 제공함으로 인해 사고를 미연에 예방하고자 한다. 이 방법은 저가의 스테레오 카메라를 이용하여 경제적인 비용으로 구성이 가능하다.

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