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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>
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>
Lee, Jun-Won,Lee, Seung-Hwan,Youn, Young-Jin,Ahn, Min-Soo,Kim, Jang-Young,Yoo, Byung-Su,Yoon, Junghan,Kwon, Woocheol,Hong, In-Soo,Lee, Kyounghoon,Kwan, Jun,Park, Keum Soo,Choi, Donghoon,Jang, Yang Soo The Korean Academy of Medical Sciences 2014 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.29 No.1
<P>Recent studies suggest that the intracoronary administration of bone marrow (BM)-derived mesenchymal stem cells (MSCs) may improve left ventricular function in patients with acute myocardial infarction (AMI). However, there is still argumentative for the safety and efficacy of MSCs in the AMI setting. We thus performed a randomized pilot study to investigate the safety and efficacy of MSCs in patients with AMI. Eighty patients with AMI after successful reperfusion therapy were randomly assigned and received an intracoronary administration of autologous BM-derived MSCs into the infarct related artery at 1 month. During follow-up period, 58 patients completed the trial. The primary endpoint was changes in left ventricular ejection fraction (LVEF) by single-photon emission computed tomography (SPECT) at 6 month. We also evaluated treatment-related adverse events. The absolute improvement in the LVEF by SPECT at 6 month was greater in the BM-derived MSCs group than in the control group (5.9%±8.5% vs 1.6%±7.0%; <I>P</I>=0.037). There was no treatment-related toxicity during intracoronary administration of MSCs. No significant adverse cardiovascular events occurred during follow-up. In conclusion, the intracoronary infusion of human BM-derived MSCs at 1 month is tolerable and safe with modest improvement in LVEF at 6-month follow-up by SPECT. (ClinicalTrials.gov registration number: NCT01392105)</P>