Measurements of 42 P-wave speeds and 41 attenuations were fulfilled in three core sediments. ... These geoacoustic models of coastal bottom strata will be used for geoacoustic and underwater acoustic ... P-wave speed was measured by the pulse transmission technique, and the resonance frequency of piezoelectric
Meniere disease 메니에르병 disorder of the inner ear due to an excessive buildup of endolymphatic fluid acoustic ... macular degeneration 황반변성 entropion outward turning of the rim of the eyelid 안검내번 tonometer instrument to measure
The relationship was examined between geographical parameters (fish school area and volume) measured ... The acoustic survey was carried out in Funka Bay, off southern Hokkaido, Japan in December 1998. ... out the probability of the abundance estimation by geographical parameters of fish school during the acoustic
진동수-SPL그래프의 이름을 ‘Acoustic ine source란, 선으로 간주되는 선음원이다. 즉, 일직선상에 점음원이 연속적으로 분포하고 있는 음원이다. ... Title Environmental Noise Measurement 2. Object 생활에서의 소음을 측정하는 방법을 안다. ... 디지털 장치가 아닌 기계식 아날로그 장치이므로 데이터의 정확한 값을 수치로 표현할 수는 없다. * SA-A1 (Multi-function Measuring System Platform
그런 까닭으로 그러한 종류의 소음을 A-평가계측(A-rated measurement)으로 그 영향을 파알하는 것은 한계가 있다. ... 그러한 기법의 사용은 심리측정방법을 심리음향학(Psycho-acoustics), 특히 츠뷔커학파(Zwicker school)의 심리음향학 방법론과 결합한 것으로 볼 수 있다.
This paper describes measurements of the target strength of Cyprinus Carpio, which measurements made ... the earliest days of applying acoustic techniques to fish biomass estimates. ... Research on the acoustic properties of fish has been carried out by a number of scientific workers from
It was measured by a 3D underwater positioning system with a radio-acoustic linked positioning buoys. ... An experiment to acoustically analyze the shape of gill-net in the current was conducted in Jaran Bay ... Six of 7 acoustic transmitters used in the experiment were attached on the float line of the gill-net
new absorption material, cellulose sponge soaked in cement, was made for anechoic water tank and its acoustical ... The echo reduction ER (dB) of the absorption tile with 5.0cm wedge measured in water tank was higher
The measurements were made at 40 and 170 in KHz. ... 활어에 대한 유효산란길이의 확률분포와 Rayleigh 분포화의 적합도를 유의수준 5%에서 x 상(2) 검정한 결과, 파장에 대한 어체의 길이의 비(acoustic length ratio ... also reported that the Rayleigh probability density function on fish was performed at the critical acoustic
The results can be used to estimate of TS of A. aurita by acoustic model. ... In this study, the sound-speed and density contrasts were measured using time-of-flight and neutral buoyancy
swimming velocity of Pacific saury (Cololabis saira) migrated offshore Funka Bay of Hokkaido using an acoustic ... The ADCP's doppler shift revealed as the raw data that the maximum swimming velocity was measured 163.0cm ... comparisons for each stratified bins must be made between the mean surrounding current velocity vectors, measured
by a theoretical acoustic scattering model. ... Then, the measured SV values were compared and analyzed in its Target Strength (TS, dB) values estimated
Westergaard added mass and Chopra added mass methods are compared with the one by the CASI (Coupled Acoustic ... eccentricity to CASI ones, while the Westergaard added mass yields much more conservative results in all measures
about 30 m) rather than another immigration route when the Pacific codes were tagged surgically with an acoustic ... hydrophone attached on a portable CTD and an underwater noise level meter during four seasons, and the acoustical ... By some preliminary studies it was measured several times that adult Pacific codes (Gadus microcephalus
From the in-air and in-water impedance responses, the measured value of the electro-acoustic conversion ... A maximum receiving sensitivity (SRT) of -183.57dB re 1V/μPa was measured at 51.45kHz and the receiving ... was designed using the equivalent circuit model, and the underwater performance characteristics were measured
Acoustic target strength (TS) of 12 commercially important fish species caught in the Korean waters ... Laboratory measurements of target strength on 12 dominant fish species were carried out at a frequencies ... The target strength pattern on individual fish of each species was measured as a function of tilt angle
aggregation of marine organisms which was measured by using a 50kHz echo sounder on board of the training ... This paper describes on the characteristics of the acoustic echoes from the scattering layers by the ... Acoustic data showed that the abundance distribution of marine organisms according to depth in the servery
in May, June, October and November of 2004 using ADCP(acoustic doppler current profiler). ... current structure between Sori Island and Yokji Island in the South Sea of Korea, water movements were measured
When estimating acoustically the fish length by a fish sizing echo sounder, it is of crucial importance ... The target strength under well-controlled laboratory conditions was simultaneously measured with the
Therefore, it is necessary to analyze the reliability of its measurement results before applying it in ... The t-test for the mean values of the defect measurement between the two groups showed no statistically ... In this study, we measured internal defects in wood by cross-applying destructive resistance micro drilling