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조업선에서 수집한 음향자료에 대한 잡음 제거 기법에 관한 연구
이형빈 ( Hyungbeen Lee ),최석관 ( Seok Gwan Choi ),이경훈 ( Kyounghoon Lee ),이재봉 ( Jae Bong Lee ),이종희 ( Jong Hee Lee ),최정화 ( Jung Hwa Choi ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.3
The Commission for Conservation of Antarctic Marine Living Resources (CCAMLR) is utilized to manage krill resources using acoustic data collection and a scientific observer program operating on the fishing boats. However, the acoustic data were contained seriously noise, example of background, spike, and intermittent noise, due to purpose of fish boats. In this study, the noise removal techniques were confirmed the potential of the acoustic data analysis. Acoustic system and frequency used in the survey were commercial echosounder (ES70, SIMRAD) and 200 kHz split beam transducer. Acoustic data were analyzed using Echoview software (Myriax), and general data analysis and new noise removal method was used. Although a variety of noise, most of the noises have been removed using the noise removal processing. We confirmed the possibility of analyzing the acoustic data obtained from fish boats. The results will be useful for analysis of the acoustic data acquired from krill fishing boats.
Lee, Kyounghoon,Baek, Dae-Hyun,Na, Hyungjoo,Choi, Jungwook,Kim, Jongbaeg Elsevier 2018 Sensors and actuators. B, Chemical Vol.265 No.-
<P><B>Abstract</B></P> <P>Heterojunctions, formed at the interface between two different materials, have attracted much attention as a gas-sensing material. In particular, Si/tungsten oxide (WO<SUB>X</SUB>) heterojunctions are well known to be capable of gas detection at low temperature and to increase the sensitivity to and selectivity of NO<SUB>2</SUB>. However, during the fabrication process of the Si/WO<SUB>X</SUB> nanostructure-based sensor it is difficult to control the synthesis position of the nanostructures; hence, it is complicated or time consuming. In this work, semiconducting gas sensors based on n-type silicon/n-type suspended tungsten oxide nanowire (WO<SUB>X</SUB> NW) heterojunctions were fabricated by stress-induced method for WO<SUB>X</SUB> NW synthesis on Si MEMS structures. With this fabrication technique, the growth position of the WO<SUB>X</SUB> NWs can be controlled by patterning of the WO<SUB>X</SUB> seed film, and the NWs can be synthesized by simply heating the seed film for 20 min. In addition, all fabrication processes consist of batch-processes. Unlike conventional WO<SUB>X</SUB>-based sensors, the resistance of this sensor is reduced in the presence of NO<SUB>2</SUB>, an oxidizing gas, due to the band bending phenomenon of the Si/WO<SUB>X</SUB> NW heterojunction. The fabricated sensor can detect 500 ppb of NO<SUB>2</SUB> and exhibits excellent selectivity to CO and toluene, which are exhaust gases, like NO<SUB>2</SUB>. This selectivity will be particularly useful when using sensors to detect NO<SUB>2</SUB> in exhaust gases of automobiles or factories.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Proposed fabrication method can control the growth position of nanowires, is simple and rapid. </LI> <LI> All fabrication processes consist of batch-processes. </LI> <LI> Newly proposed a mechanism for sensing NO<SUB>2</SUB> with Si/WO<SUB>X</SUB> heterostructure. </LI> <LI> Detected ppb levels of NO<SUB>2</SUB>, and showed excellent selectivity to CO and toluene. </LI> </UL> </P>
LEE, Kyounghoon,MUKAI, Tohru,LEE, Daejae,IIDA, Kohji Blackwell Publishing Asia 2008 Fisheries Science Vol.74 No.2
<P>ABSTRACT: </P><P>Acoustic Doppler current profilers (ADCPs) have recently been used to estimate the dynamic characteristics and biomass of sound scattering layers (SSLs) or swimming speed of fish schools and to analyze SSL spatial distribution or various behavior patterns. This paper shows that it is necessary to verify mean volume backscattering strength (MVBS, dB) values acquired from each beam for quantitative analysis of the spatial distribution or the biomass estimates of such specific targets as SSL or a fish school when using an ADCP. In this study, the SSL was selected to be a homogeneous density layer over a large area and two methods were used to verify the MVBS values from each beam of the ADCP. First, a mutual comparison among four beams was conducted after calculating MVBS from the measured echo intensity. Second, the MVBS values were verified using comparison between the calculated MVBS from the 153.6 kHz ADCP and MVBS from three frequencies of a well-calibrated scientific echosounder. Moreover, the dominant scatterers (euphausiids) were collected by a framed midwater trawl. From these samples, biological data were used to identify the different frequency characteristics between two systems, using a distorted-wave Born approximation (DWBA) theoretical backscattering model in order to assess the averaged target strength and target strength TS differences for the three frequencies.</P>
Lee, Donggil,Lee, Kyounghoon,Pyeon, Yongbeom,Kim, Seonghun,Bae, Jaehyun The Korean Society of Fisheries and Ocean Technolo 2015 수산해양기술연구 Vol.51 No.2
Recently LED fish-attracting lamps have been more widely used in fisheries as low-cost and high-efficiency fishing gear, and development of long-life high-efficiency lamps is required through the design of LED packages to optimize heat resistance. This study developed an improved LED fish-attracting lamp with excellent heat performance, which was verified using a numerical model. Heat-resistance design factors such as the heat-radiation fin shape, PCB type, and LED chip count were investigated and optimized. Comparison with a commercial 180-W LED fishing lamp showed that the increase in initial temperature was 40% higher than that of the surrounding LED chip because of design errors in contact thermal resistance. The 250-W LED lamp developed in this study has a characteristic with thermal rising in linearly stable according to the heat source. In addition, luminance efficiency was improved by 20-65% by using flow-visualization simulation. A decrease of 45% in total power consumption with a fuel-cost reduction of over 55% can be expected when using these optimized heat release design factors.
Acoustic monitoring using multi-beam imaging sonar through a set net in the Southern Sea, Korea
Lee, Hyungbeen,Lee, Kyounghoon,Kim, Seonghun,Lee, Donggil,Yang, Yongsu Springer Japan KK 2016 Fisheries Science Vol.82 No.5
<P>This study investigated a method for monitoring fish flux though a set net in the coastal South Sea, Korea, using sideward-looking wide angle multi-beam imaging sonar (blueview). This data set was used to examine the impact of changes in diel variation and current speed from a set net. During nighttime, the influx of fish in the set net was significantly 22 times higher than in daytime. The time when high fish flux was observed corresponded to the time of low current speed during nighttime. In contrast, the fish flux was not affecting current speed during daytime. The study provides implications for understanding fish behavior through use of a set net.</P>