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격음 노출 후 기니픽 달팽이관내 내유모세포 부동섬모 손상 정도의 SEM에 의한 관찰
장순석 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1
The inner hair cell stereocilia of the guinea pig cochlea was examined under a scanning electron microscope (SEM) after loud tone exposure onto the ear drum of the animals. Before and after guinea pigs were exposed to intensive and continuous tone such as 106 dB SPL in intensity, the functioning of the cochlea was monitored by N1-N2 audiograms. The structural damage of the stereocilia of inner hair cells (IHCs) and outer hair cells (OHCs) was examined using the SEM in x1500 magnification. The preparation of the cochlear specimen is explained in detail. The comparison between the functional change of the cochlea and the structural damage of the IHC stereocilia is done by means of photographic observation. It can be shown that the functional change might be related to the structural damage of the IHC stereocilia after intensive acoustic trauma.
움직이는 물체의 거리 및 속도 측정을 위한 고전력 쏘나 시스템 개발
장순석,안홍구,이제형 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2
This paper aims for the development of the high power sonar system for measuring the distance and the velocity of a moving object. The high power sonar system transmits two gated 190 KHz sinusoidal signals with 1.6〔ms〕 time interval to the moving object. Then the sonar system detects and calculates the changed time delay of the reflected ultrasonic signals in order to derive the velocity of the moving object. The transmission part uses a high power amplifier so that 250W gated sinusoidal signals can be transmitted to the transmitter. 1M RAM is utilized for transmitting and storing of the ultrasonic signals. The time delay is calculated by the cross-correlation technique between the transmitted signals and the received signals. The measured value from the high power sonar system is compared with directly measured values by photo diodes. The result confirms the adjacency to 0.3% error.
Acoustic Duct 내부에 장착된 아이오노머의 이온기 변화에 따른 흡음패턴 측정
장순석,김준섭,이제형,박재철 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.2
Nowadays, as the industrial technology and instrumentation are developed, the interest of the characteristic improvement of sound absorbing materials is rising. Recently new sound absorbing materials are being developed and manufactured for commercialization. But most of sound absorbing materials are polymer-typed or are fabricated by polymers (mixtures of polymer and glass fiber, asbestos...) for better physical characteristic. However, there was not much research about sound absorption change by the change of the ionic nature. In this paper, I composed polymers that include alkaline or acid, or other polymer that have the ionic nature to improve sound absorption characteristic and searched the characteristic pattern of the sound absorption of polymer. I used probe microphone instead of 1/4 condenser microphone such as two- microphone method in order to measure in-duct absorption coefficient of specimen of ionomers that are thin and small so that measuring absorption coefficient is not well defined.
이우선,조금배,장순석 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1
We have been fabricated the high voltage TFT(HVTFT) having output voltage of l00V. The hysteresis curves occurred in the HVTFT. Hysteresis charactristics measured in the range of drain voltage of l00V, gate voltage of 100V. Drain current Id showed negative current characteristic a t high gate voltage. We found that the according to the forward voltage Vg increase, the drain current Id decreased. And the reverse voltage Vg decreased exponentially with the drain current Id. The hysteresis region occurred mare larger at high voltage. According to the Vd increase, Id (on/off) ratio decreased exponentially.
Jarng Soon Suck,Kwon You Jung,Lee Je Hyeong The Acoustical Society of Korea 2005 韓國音響學會誌 Vol.24 No.e3
Two twin microphones may produce particular patterns of binaural directivity by time delays between twin microphones. The boundary element method (BEM) was used for the simulation of the sound pressure field around the head model in order to quantify the acoustic head effect. The sound pressure onto the microphone was calculated by the BEM to an incident sound pressure. Then a planar directivity pattern was formed by four sound pressure signals from four microphones. The optimal binaural directivity pattern may be achieved by adjusting time delays at each frequency while maintaining the forward beam pattern is relatively bigger than the backward beam pattern.
Active Linear Modeling of Cochlear Biomechanics Using Hspice
Jarng Soon Suck,Kwon You Jung The Acoustical Society of Korea 2005 韓國音響學會誌 Vol.24 No.e3
This paper shows one and two dimensional active linear modeling of cochlear biomechanics using Hspice. The advantage of the Hspice modeling is that the cochlear biomechanics may be implemented into an analog Ie chip. This paper explains in detail how to transform the physical cochlear biomechanics to the electrical circuit model and how to represent the circuit in Hspice code. There are some circuit design rules to make the Hspice code to be executed properly.
Jarng Soon Suck The Acoustical Society of Korea 2005 韓國音響學會誌 Vol.24 No.e1
The inner hair cell stereocilia of the guinea pig cochlea was examined under a scanning electron microscope (SEM) after loud tone exposure onto the ear drum of the animal. Before and after guinea pigs were exposed to intensive and continuous tone such as 106 dB SPL in intensity, the functioning of the cochlea was monitored by N1-N2 audiograms. The structural damage of the stereocilia of inner hair cells (IHCs) and outer hair cells (OHCs) was examined using the SEM in x 1500 magnification. The comparison between the functional change of the cochlea and the structural damage of the IHC stereocilia is done by means of photographic observation. It can be shown that the functional change might be related to the structural damage of the IHC stereocilia after intensive acoustic trauma.
Exterior Acoustic Holography Reconstruction of a Tuning Fork Using Inverse Non-singular BEM
Jarng, Soon-Suck The Acoustical Society of Korea 2003 韓國音響學會誌 Vol.22 No.e1
Non-singular boundary element method (BEM) codes are developed in acoustics application. The BEM code is then used to calculate unknown boundary surface normal displacements and surface pressures from known exterior near field pressures. And then the calculated surface normal displacements and surface pressures are again applied to the BEM in forward in order to calculate reconstructed field pressures. The initial exterior near field pressures are very well agreed with the later reconstructed field pressures. Only the same number of boundary surface nodes (1178) are used for the initial exterior pressures which are at first calculated by Finite Element Method (FEM) and BEM. Pseudo-inverse technique is, used for the calculation of the unknown boundary surface normal displacements. The structural object is a tuning fork with 128.4 ㎐ resonant. The boundary element is a quadratic hexahedral element (eight nodes per element).
Tuning Fork Modal Analysis and Sound Pressure Calculation Using FEM and BEM
Jarng, Soon-Suck,Lee, Je-Hyung The Acoustical Society of Korea 2002 韓國音響學會誌 Vol.21 No.e3
An unconstrained tuning fork with a 3-D model has been numerically analyzed by Finite Element Method (FEM) and Boundary Element Method (BEM). The first three natural frequencies were calculated by the FEM modal analysis. Then the trend of the change of the modal frequencies was examined with the variation of the tuning fork length and width. An formula for the natural frequencies-tuning fork length relationship were derived from the numerical analysis results. Finally the BEM was used for the sound pressure field calculation from the structural displacement data.