• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.67-68
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• 2023

본 논문에서 제안한 Multi Agent Multi Action은 기존의 대화형 시스템 방식인 Single Agent Single Action 구조에 비해 확장성을 갖춘 대화 시스템을 구현하는 방식이다. 시스템을 여러 에이전트로 분할하고, 각 에이전트가 특정 액션에 대한 처리를 담당함으로써 보다 유연하고 효율적인 대화형 시스템을 구현할 수 있으며, 다양한 작업에 특화된 에이전트를 그룹화함으로써 작업의 효율성을 극대화하고, 사용자 경험을 향상 시킬 수 있다.

• Korean Journal of Pharmacognosy
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• v.44 no.3
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• pp.253-256
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• 2013

Six flavonoid compounds were isolated from the underground parts of Curcuma longa (Zingiberaceae) through repeated column chromatography. Their chemical structures were elucidated as kaempferol-3-O-${\alpha}$-L-rhamnopyranosyl(1${\rightarrow}$2)-O-${\alpha}$-L-rhamnopyranoside (1), quercetin-3-O-${\alpha}$-L-rhamnopyranosyl(1${\rightarrow}$2)-O-${\alpha}$-L-rhamnopyranoside (2), quercetin-3-O-${\beta}$-Dglucopyranoside-7-O-${\alpha}$-L-rhamnopyranoside (3), kaempferol-3-O-${\alpha}$-L-rhamnopyranoside (4), quercetin-3-O-${\alpha}$-L-rhamnopyranoside (5), and quercetin (6), respectively, by spectroscopic analysis. These compounds were isolated for the first time from this plant.

• Korean Journal of Pharmacognosy
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• v.44 no.4
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• pp.368-371
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• 2013

Five phenolic compounds were isolated from the whole plants of Juncus diastrophanthus (Juncaceae) through repeated column chromatography. Their chemical structures were elucidated as methyl 3,5-di-O-caffeoylquinate (1), luteolin-7-O-${\beta}$-D-glucopyranoside (2), methyl 4,5-di-O-caffeoylquinate (3), quercetin-3-O-${\beta}$-D-arabinopyranoside (4), and methyl 3,4-di-O-caffeoylquinate (5) by spectroscopic techniques. These compounds were isolated for the first time from this plant.

• Korean Journal of Pharmacognosy
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• v.44 no.1
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• pp.16-21
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• 2013

The fruits of Pourthiaea villosa were extracted with methanol and its extract was fractionated with n-hexane, methylene chloride, ethyl acetate and n-butanol. Repeated column chromatography of silica gel, sephadex LH-20 and HPLC led to the isolation of nine phenolic compounds from ethyl acetate soluble fraction. The chemical structures were elucidated as kaemferol-3-O-${\beta}$-D-glucopyranoside (astragalin) (1), isorhamnetin-3-O-${\beta}$-D-glucopyranoside (2), kaempferol-3-O-${\beta}$-D-xylopyranosyl($1{\rightarrow}2$)-${\alpha}$-L-rhamnopyranoside (3), caffeic acid (4), quercetin-3-O-${\beta}$-D-xylopyranosyl($1{\rightarrow}2$)-a-L-rhamnopyranoside (5), quercetin-3-O-${\beta}$-D-xylopyranosyl($1{\rightarrow}2$)-${\beta}$-D-glucopyranoside (6), quercetin-3-O-${\beta}$-D-xylopyranosyl($1{\rightarrow}2$)-${\beta}$-D-galactopyranoside (7), quercetin-3-O-${\alpha}$-L-rhamnopyranoside (quercitrin) (8), and kaempferol-3-O-${\alpha}$-L-rhamnopyranoside (afzelin) (9) by spectroscopic techniques. These compounds were isolated from this plant for the first time.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.244-244
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• 2011

핵융합장치 내부의 플라즈마 대면재료는 고온의 플라즈마와 직접 대면하므로 수 십 MW/$m^2$에 이르는 큰 열부하에 따른 재료의 물성변화, 즉 고온환경에 따른 재료의 팽윤, 크리프(creep) 변형 그리고 금속이 가역성이나 연성을 잃는 취화현상 등이 중요한 연구주제이다. 고열부하의 인가를 통한 핵융합대면재료의 물성실험은 현재 국내에서는 탄소히터, 열플라즈마 등을 이용하여 이루어지고 있으며 국외에서는 짧은 시간에 큰 열부하를 인가할 수 있는 고출력 전자빔장치가 주요한 열부하실험장치로 활용되고 있다. 본 연구에서는 기초적인 실험이 가능한 고열부하용 전자빔조사장치를 제작하여 대표적인 플라즈마 대면재료인 텅스텐에 60 keV, 30 mA의 전자빔을 조사한 후 고열부하에 따른 텅스텐의 물성변화를 측정하였다.

• Journal of Ceramic Processing Research
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• v.19 no.5
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• pp.434-438
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• 2018

The sintering behavior of $BaFe_{12}O_{19}$ with the addition of one and three weight % of $CuWO_4$ as a liquid phase sintering aid is studied. Samples are sintered in the temperature range $900-1250^{\circ}C$ and the effect of $CuWO_4$ addition on density, microstructure, phase composition and magnetic properties is examined. Compared to $BaFe_{12}O_{19}$ with no sintering aid addition, addition of 1 wt % $CuWO_4$ retards densification. Addition of 3 wt % $CuWO_4$ promotes densification at lower sintering temperatures but retards densification at temperatures > $1050^{\circ}C$. Three wt % $CuWO_4$ addition induces the formation of $BaWO_4$ and $Ba_3WFe_2O_9$ secondary phases at temperatures ${\geq}1100^{\circ}C$. Addition of $CuWO_4$ causes a decrease in saturation magnetization, remanent magnetization and coercivity.

• Proceedings of The KACE
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• 2017.08a
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• pp.31-34
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• 2017

현재 4차 산업혁명이 사회에 던지는 화두는 다양하다. 첫째, 소프트웨어 중심 사회이다. 빅 데이터, 인공지능 기술 등이 다양한 분야와 결합하고 그 중심에는 소프트웨어가 있다. 앞으로 소프트웨어 교육이 필수적이고 강화되어야 할 이유다. 둘째, 생산과 소비가 결합된다는 것이다. 즉, 더 이상 소비자가 수동적인 소비자로만 남지 않으며, 획일화된 제품과 서비스에 흥미를 느끼지 않고, 소비자가 직접 자신이 구매할 제품 생산과 판매에 관여하는 '프로슈머(prosumer)' 필요한 물건을 직접 만드는 D.I.Y.(Do It Yourself), 3D 프린팅 등이 새로운 소비 방식을 대표한다[3]. 이에 메이커 운동이 떠오르고 있고, 메이커에 대한 관심이 커지고 있다. 우리나라는 2015 개정 교육과정을 통해 소프트웨어 교육을 강화했다. 초등학교에서는 5~6학년 실과 교과의 정보 관련 단원이 ICT활용 중심에서 소프트웨어 기초 소양 내용 중심으로 개편되었다[1]. 아직 교육과정이 시행되기 전이지만 선도학교나 연구학교를 통해 진행된 소프트웨어 교육을 보면 기능을 익히는 프로그래밍 교육이 주류를 이루고 있고, 이래서는 다양하고 창의적인 결과물을 도출할 수 없다. 이를 해결하기 위해서는 디자인 사고를 도입할 수 있다. 디자인 사고는 인간을 관찰하고 공감하여 소비자를 이해한 뒤, 다양한 대안을 찾는 확산적 사고와 주어진 상황에 최선의 방법을 찾는 수렴적 사고의 반복을 통하여 혁신적 결과물을 도출하는 창의적 문제 해결 방법 중 하나이다[5]. 따라서 본 연구에서는 초등학생들의 소프트웨어 교육을 위한 디자인 사고 기반 메이커 교육 프로그램을 개발하고자 한다.

• Journal of Biosystems Engineering
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• v.36 no.2
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• pp.140-146
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• 2011

This study was performed to develop a rapid test kit for pathogenic Salmonella in various samples. The rapid detection kit has been fabricated based on nitrocellulose lateral-flow strip. Colloidal gold and biotin conjugated Salmonella antibodies were used as a tag and a receptor, respectively. Manually spotted Salmonella antibody and Neutravidin on nitrocellulose membrane were used as test and control lines, respectively. Feasibility of the rapid kit to detect Salmonella typhimurium in samples were evaluated. The intensity of the color of the test line started to increase with the samples in which higher concentration of the cells were contained. The sensitivity of the sensor was $10^6$ cfu/mL Salmonella spiked in PBS. Also, the rapid test kit could detect $10^6$ cfu/mL of Salmonella in chicken meat extract.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.33 no.5
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• pp.367-372
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• 2020

As packaging processes for atomic gyroscope vapor cells, the glass tube tip-off process, anodic bonding, and paste sealing have been widely studied. However, there are stability issues in the alkali metal which are caused by impurity elements and leakage during high-temperature processes. In this study, we investigated the applicability of a vapor cell low-temperature packaging process by depositing Au on a Pyrex cell in addition to forming an Au-Sn thin film on a cap to cover the cell, followed by laser irradiation of the Au/Au-Sn interface. The mechanism of the thin film bonding was evaluated by XRD, while the packaging reliability of an Ne gas-filled vapor cell was characterized by variation of plasma discharge behavior with time. Furthermore, we confirmed that the Rb alkaline metal inside the vapor cell showed no color change, indicating no oxidation occurred during the process.

• Korean Journal of Pharmacognosy
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• v.48 no.1
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• pp.63-69
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• 2017

Saururus chinensis (Lour.) Baill. (Saururaceae) has been used as a traditional medicine for the treatment of dysuria, leukorrhea, eczema, jaundice and ascites in Korea, China and Japan. Ethanol extract of S. chinensis was successively partitioned as methylene chloride, ethyl acetate, n-butanol and $H_2O$ soluble fractions. Among those fractions the ethyl acetate soluble fraction showed the most potent DPPH radical scavenging and superoxide quenching activities. To verify antioxidant activities of ethyl acetate fraction, we checked the activities of superoxide dismutase (SOD) and catalase, and intracellular ROS level and oxidative stress tolerance in Caenorhabditis elegans. Furthermore, to see if increased stress tolerance of worms by treating of ethyl acetate fraction was due to regulation of stress-response gene, we quantified SOD-3 expression using transgenic strain. Consequently, ethyl acetate fraction elevated SOD and catalase activities of C. elegans, and reduced intracellular ROS accumulation in a dose-dependent manner. Moreover, ethyl acetate fraction-treated CF1553 worms exhibited significantly higher SOD-3::GFP intensity.