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Kang, Myounghee The Korean Society of Fisheries and Aquatic Scienc 2014 Fisheries and Aquatic Sciences Vol.17 No.3
I provide an overview of the application of hydroacoustic methods in South Korea to understand the current research status in relation to fisheries acoustics and to determine which areas require further study. One main purpose for using a scientific echosounder, a representative tool using the hydroacoustic method, is to evaluate the abundance of fisheries resources. Thus, two representative methods for abundance estimation are described. The history of fisheries acoustics worldwide is also summarized.
A preparatory study on fish behavioral properties in a set-net
KANG, Myounghee,LIU, Jenming,HASSAN, Raja Bidin bin Raja,FAJARYANTI, Rina,HWANG, Bokyu The Korean Society of Fisheries and Ocean Technolo 2020 수산해양기술연구 Vol.56 No.2
The fish influx and behavioral properties at a set-net off Goseong, South Korea were investigated using an imaging sonar. As a result, the average influx of fish was 33.9% at day time and 66.1% at night time, respectively, which indicated that a majority of fish entered into a playground in the set-net at night. The fish behavioral properties such as target (fish) length, range, orientation and major-axis angle were examined and compared among survey dates (4, 5, and 6 June 2019) using the statistical analysis tool (analysis of variance, ANOVA). The behavioral properties presented differently sometime of survey dates. This is preparatory study to support fish behavior properties in a set-net. It is expected that more elaborated behavioral information of fishes in the set-net is beneficial for designing and deploying a set-net fishing gear as well as general fish behavior research in the future.
Kang, Tae Eui,Cho, Han-Hee,Cho, Chul-Hee,Kim, Ki-Hyun,Kang, Hyunbum,Lee, Myounghee,Lee, Sunae,Kim, BongSoo,Im, Chan,Kim, Bumjoon J. American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.3
<P>Polymer solar cells (PSCs) consisting of fullerene bis-adduct and poly(3-hexylthiophene) (P3HT) blends have shown higher efficiencies than P3HT:phenyl C<SUB>61</SUB>-butyric acid methyl ester (PCBM) devices, because of the high-lying lowest unoccupied molecular orbital (LUMO) level of the fullerene bis-adducts. In contrast, the use of fullerene bis-adducts in donor–acceptor (DA) copolymer systems typically causes a decrease in the device’s performance due to the decreased short-circuit current (<I>J</I><SUB>SC</SUB>) and the fill factor (FF). However, the reason for such poor performance in DA copolymer:fullerene bis-adduct blends is not fully understood. In this work, bulk-heterojunction (BHJ)-type PSCs composed of three different electron donors with four different electron acceptors were chosen and compared. The three electron donors were (1) poly[(4,8-bis-(2-ethylhexyloxy)benzo[1,2-<I>b</I>:4,5-<I>b</I>′]dithiophene)-2,6-diyl-<I>alt</I>-(5-octylthieno[3,4-<I>c</I>]pyrrole-4,6-dione)-1,3-diyl] (PBDTTPD), (2) poly[(4,8-bis-(2-ethylhexyloxy)benzo[1,2-<I>b</I>:4,5-<I>b</I>′]dithiophene)-2,6-diyl-<I>alt</I>-(4-(2-ethylhexanoyl)-thieno[3,4-<I>b</I>]thiophene)-2,6-diyl] (PBDTTT-C), and (3) P3HT polymers. The four electron acceptors were (1) PCBM, (2) indene-C<SUB>60</SUB> monoadduct (ICMA), (3) indene-C<SUB>60</SUB> bis-adduct (ICBA), and (4) indene-C<SUB>60</SUB> tris-adduct (ICTA). To understand the difference in the performance of BHJ-type PSCs for the three different polymers in terms of the choice of fullerene acceptor, the structural, optical, and electrical properties of the blends were measured by the external quantum efficiency (EQE), photoluminescence, grazing incidence X-ray scattering, and transient absorption spectroscopy. We observed that while the molecular packing and optical properties cannot be the main reasons for the dramatic decrease in the PCE of the DA copolymers and ICBA, the value of the driving force for charge transfer (Δ<I><I>G</I></I><SUB>CT</SUB>) is a key parameter for determining the change in <I>J</I><SUB>SC</SUB> and device efficiency in the DA copolymer- and P3HT-based PSCs in terms of fullerene acceptor. The low EQE and <I>J</I><SUB>SC</SUB> in PBDTTPD and PBDTTT-C blended with ICBA and ICTA were attributed to an insufficient <I>Δ<I>G</I></I><SUB>CT</SUB> due to the higher LUMO levels of the fullerene multiadducts. Quantitative information on the efficiency of the charge transfer was obtained by comparing the polaron yield, lifetime, and exciton dissociation probability in the DA copolymer:fullerene acceptor films.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-3/am302479u/production/images/medium/am-2012-02479u_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am302479u'>ACS Electronic Supporting Info</A></P>