• Title, Summary, Keyword: 손 동작 인식

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Hand Gesture Recognition Regardless of Sensor Misplacement for Circular EMG Sensor Array System (원형 근전도 센서 어레이 시스템의 센서 틀어짐에 강인한 손 제스쳐 인식)

  • Joo, SeongSoo;Park, HoonKi;Kim, InYoung;Lee, JongShill
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.11 no.4
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    • pp.371-376
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    • 2017
  • In this paper, we propose an algorithm that can recognize the pattern regardless of the sensor position when performing EMG pattern recognition using circular EMG system equipment. Fourteen features were extracted by using the data obtained by measuring the eight channel EMG signals of six motions for 1 second. In addition, 112 features extracted from 8 channels were analyzed to perform principal component analysis, and only the data with high influence was cut out to 8 input signals. All experiments were performed using k-NN classifier and data was verified using 5-fold cross validation. When learning data in machine learning, the results vary greatly depending on what data is learned. EMG Accuracy of 99.3% was confirmed when using the learning data used in the previous studies. However, even if the position of the sensor was changed by only 22.5 degrees, it was clearly dropped to 67.28% accuracy. The accuracy of the proposed method is 98% and the accuracy of the proposed method is about 98% even if the sensor position is changed. Using these results, it is expected that the convenience of the users using the circular EMG system can be greatly increased.

Interaction Technique in Smoke Simulations using Mouth-Wind on Mobile Devices (모바일 디바이스에서 사용자의 입 바람을 이용한 연기 시뮬레이션의 상호작용 방법)

  • Kim, Jong-Hyun
    • Journal of The Korea Computer Graphics Society
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    • v.24 no.4
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    • pp.21-27
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    • 2018
  • In this paper, we propose a real-time interaction method using user's mouth wind in mobile device. In mobile and virtual reality, user interaction technology is important, but various user interface methods is still lacking. Most of the interaction technologies are hand touch screen touch or motion recognition. In this study, we propose an interface technology that can interact with real time using user's mouth wind. The direction of the wind is determined by using the angle and the position between the user and the mobile device, and the size of the wind is calculated by using the magnitude of user's mouth wind. To show the superiority of the proposed technique, we show the result of visualizing the flow of the vector field in real time by integrating the mouth-wind interface into the Navier-Stokes equations. We show the results of the paper on mobile devices, but can be applied in the Agumented reality(AR) and Virtual reality(VR) fields requiring interface technology.

Wireless Telemetry System for the FET-type Ion Sensors (FET형 이온센서용 무선원격측정시스템)

  • Jeong, H.;Choi, B.D.;Kim, Y.J.;Lee, Y.C.;Sohn, B.K.
    • Journal of Sensor Science and Technology
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    • v.10 no.3
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    • pp.187-195
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    • 2001
  • A wireless telemetry measurement system, using ISFETs, was developed for environmental monitoring applications, industrial processes, medical treatments and so on. This system is composed of the measurement part located at remote site and a personal computer(PC) which control whole instrument process. The measurement part transmits measured data to the PC by RF transceiver, and transmitted data are analyzed and handled in the PC. Proposed system utilizing time division multiplexing for the transmission of 3channel ISFET signal. The measurement part has an identification number(ID) so that the PC controls many measurement parts separately. Experiments were performed using pH-ISFETs, and the implemented system operates well within designed specification and accuracy of 0.1 pH.

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pH-Drift Characteristics of Sol-Gel-Deposited $Ta_{2}O_{5}$-Gate ISFET (Sol-Gel 법으로 형성한 $Ta_{2}O_{5}$ 게이트 ISFET의 pH 드리프트 특성)

  • Kwon, Dae-Hyuk;Cho, Byung-Woog;Kim, Chang-Soo;Sohn, Byung-Ki
    • Journal of Sensor Science and Technology
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    • v.5 no.2
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    • pp.15-20
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    • 1996
  • The diffusion of hydrogen ions into a sensing membrane causes the output voltage of pH-ISFET to vary with time, which might be considered to be drift in this sensor. We tried to deposit ultra-thin film for minimizing tile drift that has been considered to be main obstacle for putting pH-ISFET to practical use. In this paper, tantalum pentoxide, known as a good pH sensing membrane, was formed to about $70{\AA}$ thick by sol-gel method on $Si_{3}N_{4}/SiO_{2}$-gate of pH-ISFET. The fabricated $Ta_{2}O_{5}$-gate pH-ISFET showed good sensitivity(about 59mV/ pH) and good lineality in the range of pH $3{\sim}11$, and had relatively small average pH drift of about 0.06 pH/day.

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Vibrotactile Space Mouse (진동촉각 공간 마우스)

  • Park, Jun-Hyung;Choi, Ye-Rim;Lee, Kwang-Hyung;Back, Jong-Won;Jang, Tae-Jeong
    • 한국HCI학회:학술대회논문집
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    • pp.337-341
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    • 2008
  • This paper presents a vibrotactile space mouse which use pin-type vibrotactile display modules and a gyroscope chip. This mouse is a new interface device which is not only an input device as an ordinary space mouse but also a tactile output device. It consists of a space mouse which use gyroscope chip and vibrotactile display modules which have been developed in our own laboratory. Lately, by development of vibrotactile display modules which have small size and consume low power, vibrotactile displays are available in small sized embedded systems such as wireless mouses or mobile devices. Also, development of new sensors like miniature size gyroscope by MEMS technology enables manufacturing of a small space mouse which can be used in the air not in a plane. The vibrotactile space mouse proposed in this paper recognizes motion of a hand using the gyroscope chip and transmits the data to PC through Bluetooth. PC application receives the data and moves pointer. Also, 2 by 3 arrays of pin-type vibrotactile actuators are mounted on the front side of the mouse where fingers of a user's hand contact, and those actuators could be used to represent various information such as gray-scale of an image or Braille patterns for visually impared persons.

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