• 제목/요약/키워드: Biomedical Engineering

검색결과 7,042건 처리시간 0.037초

베타/감마 동시 측정용 광섬유 이중 검출기의 개발을 위한 기초연구 (Feasibility Study on Development of a Fiber-Optic Dual Detector to Measure Beta- and Gamma-rays Simultaneously)

  • 홍승한;신상훈;심혁인;김선근;전혜수;장재석;김재석;권구원;장경원;유욱재;이봉수
    • 전기학회논문지
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    • 제63권2호
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    • pp.284-290
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    • 2014
  • A fiber-optic beta/gamma dual detector system with two types of sensing probes was fabricated to detect the beta- and gamma-rays simultaneously. As scintillators of the sensing probe type 1, two different inorganic scintillators, $CaF_2(Eu)$ and LYSO(Ce) crystals, were used to obtain the each scintillating efficiency with respect to beta-and gamma-rays and the inherent energy spectra of radioactive isotopes. In the case of the sensing probe type 2, which is composed of two identical inorganic scintillators and a beta shielding material based on the lead, it could discriminate beta- and gamma-rays using a subtraction method. In conclusion, we demonstrated that the proposed fiber-optic beta/gamma dual detector could measure and discriminate beta- and gamma-rays using both energy spectroscopy and subtraction method.

8대역 비선형 라우드니스 교정 디지털 보청기 (A Digital Hearing Aid with 8-band Curvilinear Loudness Fitting)

  • 박영철;김동욱;김원기;박상일
    • 대한의용생체공학회:학술대회논문집
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    • 대한의용생체공학회 1997년도 추계학술대회
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    • pp.79-82
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    • 1997
  • In this paper, a body-worn type digital hearing aid (DHA) based on a dedicated DSP chip is developed. A fitting software running on a PC supported by the Win95 OS is also developed. The fitting protocol is based on the NAL-R procedure applied to eight frequency bands, but it is designed to support a curvilinear fitting to cope with the nonlinear perception of hearing-impaired listeners. Preliminary subjective tests regarding the speech intelligibility and perceived quality revealed that the new DHA could be of benefit to hearing aid users.

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DEVELOPMENT OF TEM HEAD-SIZE RESONATOR FOR 3T MRI HEAD COIL

  • Ha, Seung-Hoon;Choe, Bo-Young;Lee, Hyoung-Koo;Suh, Tae-Suk;Shinn, Kyung-Sub;Kim, Yong-Sik;Kim, Sung-Eun;Lee, Heung-Kyu
    • 한국의학물리학회:학술대회논문집
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    • 한국의학물리학회 1999년도 Japanese Journal of Medical Physics
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    • pp.176-177
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    • 1999
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MIT/BIH 부정맥 데이터베이스를 이용한 다중스케일 기반 피크검출 알고리즘의 검증 (A assessment of multiscale-based peak detection algorithm using MIT/BIH Arrhythmia Database)

  • 박희정;이영재;이재호;임민규;김경남;강승진;이정환
    • 전기학회논문지
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    • 제63권10호
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    • pp.1441-1447
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    • 2014
  • A robust new algorithm for R wave detection named for Multiscale-based Peak Detection(MSPD) is assessed in this paper using MIT/BIH Arrhythmia Database. MSPD algorithm is based on a matrix composed of local maximum and find R peaks using result of standard deviation in the matrix. Furthermore, By reducing needless procedure of proposed algorithm, improve algorithm ability to detect R peak efficiently. And algorithm performance is assessed according to detection rates about various arrhythmia database.

FUZZY Gain Tuning of PI Speed Controller Depending on Afterloads In Total Artificially Heart

  • 최정훈;최원우;최재순;엄경식;;민병구
    • 대한의용생체공학회:학술대회논문집
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    • 대한의용생체공학회 1997년도 춘계학술대회
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    • pp.156-160
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    • 1997
  • In this paper, the control scheme is proposed that PI controller parameter used for TAH speed control is adapted by fuzzy logic method using only the motor current waveform. By scheduling PI parameters, minimization of the vibration and the energy consumption and overcoming AoP loads becomes possible. In in vitro tests experimental results show our approach is a good scheme that is adapted to changing afterloads well.

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