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Shin, Ari,Yoon, Sang Chul,Lee, Sung Il,Park, Hee Won,Kim, Suam The Korean Society of Fisheries and Aquatic Scienc 2018 Fisheries and Aquatic Sciences Vol.21 No.1
Pacific bluefin tuna (Thunnus orientalis) is one of the commercially important species in Korea as well as other countries of the North Pacific. Korean offshore large purse seine fisheries targeting small pelagic fishes such as chub mackerel have caught T. orientalis temporarily in the east of Jeju Island. The catch of T. orientalis in March through June occupied approximately 60% of the total. The monthly catch around Jeju Island from 2004 to 2013 showed a negative correlation (r = - 0.755, p < 0.01) with the seawater temperature at 50 m and had a significant positive correlation (r = 0.856, p < 0.01) with the Pacific Decadal Oscillation Index (PDOI). The highest catch and catch per unit effort (CPUE) of T. orientalis around Jeju Island occurred either when the seawater temperature ranged between 15 and $16^{\circ}C$ at 50 m or when the catch was taken near the frontal area where two water masses from offshore and coastal areas collide. The length of T. orientalis caught around Jeju Island from 2004 to 2013 ranged from 19 to 193 cm in fork length (FL). The time series of the monthly mean FL of T. orientalis had a negative correlation (r = - 0.592, p < 0.01) with the seawater temperature at 50 m and had a significant positive correlation (r = 0.668, p < 0.05) with PDOI.
( Ari Shin ),( Sang Chul Yoon ),( Sung Il Lee ),( Hee Won Park ),( Suam Kim ) 한국수산과학회(구 한국수산학회) 2018 Fisheries and Aquatic Sciences Vol.21 No.1
Pacific bluefin tuna (Thunnus orientalis) is one of the commercially important species in Korea as well as other countries of the North Pacific. Korean offshore large purse seine fisheries targeting small pelagic fishes such as chub mackerel have caught T. orientalis temporarily in the east of Jeju Island. The catch of T. orientalis in March through June occupied approximately 60% of the total. The monthly catch around Jeju Island from 2004 to 2013 showed a negative correlation (r = - 0.755, p < 0.01) with the seawater temperature at 50 m and had a significant positive correlation (r = 0.856, p < 0.01) with the Pacific Decadal Oscillation Index (PDOI). The highest catch and catch per unit effort (CPUE) of T. orientalis around Jeju Island occurred either when the seawater temperature ranged between 15 and 16 °C at 50 m or when the catch was taken near the frontal area where two water masses from offshore and coastal areas collide. The length of T. orientalis caught around Jeju Island from 2004 to 2013 ranged from 19 to 193 cm in fork length (FL). The time series of the monthly mean FL of T. orientalis had a negative correlation (r = - 0.592, p < 0.01) with the seawater temperature at 50 m and had a significant positive correlation (r = 0.668, p < 0.05) with PDOI.
Shin, Ari,Kim, Yong-In,Ko, Se-Hyun,Han, Jun Hyun Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.737 No.-
<P><B>Abstract</B></P> <P>The microstructure and thermal properties of a carbon nanofiber reinforced copper matrix (CNF/Cu) nanocomposite processed by chemical mixing, with an electroless plated copper coating on the CNFs, were analyzed in depth and compared with those of nanocomposites processed by conventional mechanical powder mixing and wet powder mixing. The electroless copper plating on the surfaces of the individual CNFs enabled them to become embedded inside copper particles, which successfully solved the non-uniform dispersion of CNFs in Cu matrix, the most important problem in CNF/Cu nanocomposite manufacturing. The CNF/Cu nanocomposite prepared by chemical mixing had well dispersed CNFs, no pores, and no intermediate phase which can be a cause of thermal resistance. Its thermal conductivity was accordingly much higher (435 W/mK) than the nanocomposites processed by mechanical powder mixing and wet powder mixing, as well as the theoretical thermal conductivity of copper (398 W/mK).</P> <P><B>Highlights</B></P> <P> <UL> <LI> CNF/Cu composite having higher thermal conductivity (435 W/mK) than copper was developed using chemical mixing. </LI> <LI> Microstructure and thermal properties of CNF/Cu nanocomposites were studied in depth. </LI> <LI> Electroless copper plating on CNFs enabled them to become embedded inside copper particles. </LI> <LI> The chemical mixing method successfully solved the non-uniform dispersion of CNFs in copper matrix. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Shin, Ari,Hwangbo, Jun Kwon 한국정보통신학회 2022 한국정보통신학회논문지 Vol.26 No.11
The news articles collected with keyword "non face-to-face" were analyzed through topic modeling applied with LDA algorithm. In this study, collected articles were divided into two periods, period 1(the beginning of COVID-19 spread) and period 2(the end of COVID-19 spread), according to issued date of the articles. The articles of period 1 showed support for non-face-to-face treatment, smart library, the beginning of the online financial era, non-face-to-face entrance exam and employment, stock investment for main topic words. And the articles of period 2 showed conversion to non face-to-face classes, increasing unmanned stores, online finance, education industry, home treatment for main topic words. Also, further issues were discussed through visualization of topic words. These results provide evidence that education and unmanned business in non-face-to-face industries are growing.
신아리(Ari Shin),한준현(Jun Hyun Han) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.3
The effects of surface modification by nitric acid on the pre-treatment of electroless copper plating were investigated. Copper was electroless-plated on the nitric acid treated graphite activated by a two-step pre-treatment process (sensitization + activation). The chemical state and relative quantities of the various surface species were determined by X-ray photoelectron spectroscopy (XPS) after nitric acid modification or pre-treatment. The acid treatment increased the surface roughness of the graphite due to deep and fine pores and introduced the oxygen-containing functional groups (-COOH and O-C=O) on the surface of graphite. In the pre-treatment step, the high roughness and many functional groups on the nitric acid treated graphite promoted the adsorption of Sn and Pd ions, leading to the uniform adsorption of catalyst (Pd<SUP>0</SUP>) for Cu deposition. In the early stage of electroless plating, a lot of tiny copper particles were formed on the whole surface of acid treated graphite and then homogeneous copper film with low variation in thickness was formed after 30 min.
소양호에 서식하는 쏘가리 Siniperca scherzeri의 성숙과 산란 특성
신아리 ( Ari Shin ),박희원 ( Heewon Park ),이완옥 ( Wan-ok Lee ),송미영 ( Mi-young Song ) 한국어류학회 2018 韓國魚類學會誌 Vol.30 No.2
본 논문은 소양호에 서식하는 내수면어업의 주요 수산자원 중 하나인 쏘가리 (Siniperca scherzeri)의 성숙과 산란에 관하여 연구하였다. 본 논문에 사용된 쏘가리는 2014년 4월부터 11월까지 정치망과 자망을 통해 채집하였고, 암컷이 204개체로 전장범위는 113~365 mm이었고, 수컷은 197개체로 전장 범위가 140~342mm이었다. 산란기가 시작되는 5월의 수온은 15°C를 나타냈으며, 점진적으로 높아져 7월에 26°C를 나타내었다. 암컷의 생식소 숙도지수 (GSI)는 5월에서 7월까지 각각 2.3%, 4.6%, 3.1%로 나타났고, 수컷의 경우 8.0%, 6.6%, 4.5%로 나타났다. 난소 조직은 5월에 많은 수의 샘플이 중숙으로 관찰되었으며 6월에는 대다수가 성숙, 7월에는 완숙 및 방란으로 관찰되었다. 정소 조직의 경우에도 마찬가지로 5월에는 대다수가 중숙, 6월에는 성숙, 7월에는 방중으로 관찰되었다. 월별 성숙도와 생식소 숙도지수 (GSI), 생식소의 조직관찰을 통한 분석결과, 소양호에 서식하는 쏘가리의 산란기는 5월에서 6월로 추정되었다. 또한 군성숙도를 분석한 결과, 암컷 쏘가리의 50% 성숙체장은 245.16mm로 나타났다. The study about maturity and spawning of Korean Mandarin fish, Siniperca scherzeri collected using the set net and gill net in Soyangho Lake from April to November 2014 was conducted. The number of individuals was 401 (female: 204, male: 197). The total length of females ranged from 113 mm to 365 mm and that of males was from 140 mm to 342 mm. The water temperature in May which is the start of spawning season indicated about 15°C and gradually increased to July (26°C). Gonadosomatic index (GSI) of females indicated 2.3%, 4.6% and 3.1%, respectively, in May to July. Males’ value showed the similar pattern recording 8.0%, 6.6% and 4.5% in the same time. According to histological observations of gonadal tissue, the most of female in May had the gonadal tissue of maturing and mature stage. And the ovary of June was mostly in the stage of ripe and spawning and a number of individuals in July was recovery stage. In the case of male, a number of males in May showed in the stage of mature. The testis of June showed that mature sperm was releasing. And the testis of July was mostly in recovery stage. The total length at 50% group maturity was estimated 245.16 mm. As shown in the above, the main spawning period of S. scherzeri was May to June.
Current-induced Spin Wave Excitations in Asymmetric Nanopillar Junctions
Arie Fiandimas,Kyung Jin Lee,Kyung-Ho Shin 한국자기학회 2009 Journal of Magnetics Vol.14 No.2
This study examined the current-induced spin wave excitation in asymmetric nanopillar junctions with a stack sequence of 20 ㎚ Pt/10 ㎚ Cu/7 ㎚ NiFe/300 ㎚ Cu, and a circular lateral dimension of 240 ㎚. An analysis of the magnetic and magnetotransport characteristics of the junction showed a possible spin transfer effect at this sample dimension when the magnetization was switched from a vortex state to another state. This finding is expected to help improve the understanding of the spin transfer torque phenomenon in nanopillar junctions.