The aim of this study is to find out the behavior and acoustic backscattering of the large jellyfish Nemopliema nomurai using hydroacoustics in situ...
This study is aimed to understand the vertical distribution of fish in the daytime and nighttime using an acoustic survey in Yondam reservoir of Jeol..
Changes in target strength (TS) values of sandfish when sandfish was alive and dead were investigated using ex-situ at120 kHz. TS values measured by ..
Morphological properties of dark banded rockfish (Sebastes inermis) were analysed to investigate its acoustic scattering characteristics. Total of 18..
The sciaenid species, which has swimbladder, generates sounds by vibrating in its length wards when spawning or getting stimulus from something else...
Acoustic target strength (TS) measurement and theoretical acoustic scattering models were applied to estimate the TS for assessing the fish biomass. ..
This study was focused on acoustic scattering characteristics of jack mackerel (Trachurus japonicus) at frequency 38, 70, and 120 kHz by Kirchhoff-ra..
Assessment and management of fisheries abundance in fresh water like a river or a lake is very important to maintain fisheries itself as well as tour..
Jinhae Bay located in the southern of Korean Peninsular is an important spawning area in Korea. By some preliminary studies it was measured several t..
This paper describes a prototype mechanical white noise generator has a source level of more than 170.0 dB (re 1Pa at 1 m) at the frequency range of ..
We aimed to assess the behavior characteristics of fish on an artificial reef using hydroacoustic techniques. The acoustical survey was conducted wit..
The Nemopilema nomurai is a large jellyfish attaining a weight of 200 kg and bell diameter of 2 m when fully grown. To prevent damage to this species..
필름 그룹으로 나누어 마찰음의 심리음향학적 특성과 직물의 역학적 특성, 기본특성간의 관계를 고찰하였다. ... 본 연구에서는 심한 소음으로 불쾌감을 주는 스포츠웨어용 PTFE 라미네이팅 투습발수 직물 8종을 대상으로 직물 마찰음의 심리음향학적 특성을 고찰하고, 심리음향학적 특성에 영향을 미치는 ... 직물의 기본 특성과 역학적 특성 간의 관계를 파악함으로써, 직물의 심리음향학적 마찰음을 낮출 수 있는 변인을 찾아내고자 하였다.
Due to change of various marine environments according to seawater temperature rising, Japanese common squid(Todarodes pacificus), which was distribu..
Acoustic side-aspect target strength (TS) of living Japanese anchovy (Engraulis japonicus) was measured at 120kHz during in situ experiments. The dat..
조사한 결과, 그 응답특성은 송신전압감도의 주파수특성과 매우 잘 일치하는 경향을 나타내었다. ... , 1999년 8월, 2000년 4월의 3회에 걸쳐 여수대학교 실습선 청경호와 동백호를 사용하여 실시한 해양학적 및 음향학적조사에 대한 결과를 요약하면 다음과 같다. 1. ... 손실이 불가피하지만, 그 대신 주파수 대역폭을 약 5 재 정도 확대시킬 수 있는 장점이 있기 때문에 이 넓은 주파수 대역을 효과적으로 활용하면 어종식별을 위한 음향산란신호를 정량적으로
Acoustic telemetry technique is one of useful tools to get behavioral information of the free-swimming fish. In this study, we conducted acoustic tel..
In a split beam echo sounder, the transducer design needs to have minimal side lobes because the angular position and level of the side lobes establi..