국가슈퍼컴퓨팅 역량 강화를 위한 법.제도적 발전 전략

김소영,Kim, So-Yeong 한국과학기술정보연구원 2008 지식정보인프라 Vol.29 No.-

빈랑자(Arecae Semen)로부터 arecoline의 분리 및 함량분석

김소영,손건호,강신정,장승엽,박정일,이경순,이승호,Kim, So-Young,Son, Kun-Ho,Kang, Shin-Jung,Chang, Seung-Yeup,Park, Jeong-Hill,Lee, Kyong-Soon,Lee, Seung-Ho 한국생약학회 2001 생약학회지 Vol.32 No.1

The seeds of Areca catechu L. has been used for the treatment of the diseases caused by parasites in East Asia. As a part of a research for standardization of crude drugs, we have determined the content of arecoline in the seeds of Arecae Semen purchased from various regions of Korea. The HPLC method for quantitative analysis of arecoline in Arecae Semen was established and reproducible results and chromatographic isolation of arecoline was accomplished successively. It suggested that the content of arecoline in Arecae Semen was $0.2726\;{\pm}\;0.05532%$.

고해상도 방사선 영상을 위한 $Gd_2O_3:Eu^{3+}$ 나노 형광체 제조 및 광학적 특성

김소영,강상식,박지군,차병열,최치원,이형원,남상희,Kim, So-Yeong,Kang, Sang-Sik,Park, Ji-Koon,Cha, Byung-Youl,Choe, Chi-Won,Lee, Hyung-Won,Nam, Sang-Hee 대한의용생체공학회 2007 의공학회지 Vol.28 No.1

In this paper, we have synthesized $Gd_2O_3:Eu^{3+}$ nano phosphor particle using a low temperature solution-combustion method. We have investigated the structure and the luminescent characteristic as the sintering temperature and europium concentration. From XRD(X-ray diffraction) and SEM(scanning electron microscope) results, we have verified that the phosphor particle was fabricated a spherical shape with $30{\sim}40nm$ particle size. From the photoluminescence results, the strong peak exhibits at 611 um and the luminescent intensity depends on europium concentration. $Gd_2O_3:Eu$ fine phosphor particle has shown excellent luminescent efficiency at 5 wt% of europium concentration. The phosphors calcinated at $500^{\circ}C$ have possessed the x-ray peaks corresponding to the cubic phase of $Gd_2O_3$. As calcinations temperature increased to $700^{\circ}C$, the new monoclinic phase has identified except cubic patterns. From the luminescent decay time measurements, mean lifetimes were $2.3{\sim}2.6ms$ relatively higher than conventional bulk phosphors. These results indicate that $Gd_2O_3:Eu$ nano phosphor is possible for the operation at the low x-ray dose, therefore, the application as medical imaging detector.

디지털 X-ray 장치 제작 및 영상 처리 알고리즘 구현

김소영,박승우,이동훈,Kim, So-young,Park, Seung-woo,Lee, Dong-hoon 한국융합신호처리학회 2020 융합신호처리학회 논문지 (JISPS) Vol.21 No.4

본 연구에서 하루 종일 컴퓨터 앞에 앉아 있는 직장인들과 스마트폰을 자주 사용하는 현대인들의 생활 패턴으로 인해 발생하는 대표적인 현대 질병인 척추측만증에 대해 연구했다. 척추측만증은 우리나라 전체 인구의 80% 이상이 한 번 이상 걸리는 전형적인 합병증이다. X-ray는 이러한 합병증을 검사하는 데 사용된다. 조영제나 다른 기구 없이도 흉부, 복부, 뼈 등 다양한 부위에서 척추측만증을 쉽게 수행하고 촬영할 수 있는 비파괴검사법 X-선 발생 장치와 NI DAQ를 이용해 디지털 X-선 영상 장치를 소형화하고, X-선 차폐함 안에 영상 증배관과 Vision Assistant를 활용해 X-선 영상을 획득해 척추 상하부에 선을 그려 실시간으로 각도, 즉 곡률 등을 측정한다. 이와 같이 척추측만증 환자의 상태를 쉽게 볼 수 있도록 돕고, 현대인의 자세교정 문제를 해결하고 신속한 치료를 돕기 위해 연구를 수행되었다. This study studied scoliosis, one of the most common modern diseases caused by lifestyle patterns of office workers sitting in front of computers all day and modern people who use smart phones frequently. Scoliosis is a typical complication that takes more than 80% of the nation's total population at least once. X-ray are used to test for these complications. X-ray, a non-destructive testing method that allows scoliosis to be easily performed and filmed in various areas such as the chest, abdomen and bone without contrast agents or other instruments. We uses NI DAQ to miniaturize digital X-ray imaging devices and image intensifier in self-shielding housing with Vision Assistant for drawing lines to the top and the bottom of the spine to acquire angles, i.e. curvature in real-time. In this way, the research was conducted to see scoliosis patients and their condition easily and to help rapid treatment for solving the problem of posture correction in modern people.

Au 플라워가 성장된 하이브리드형 탄소 나노튜브 마이크로 섬유 기반 유연한 고민감성 압력 센서 연구

김소영,김도환,Kim, So Young,Kim, Do Hwan 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.1

Pressure-sensitive electronic skin (e-skin) has gained importance in the fields of prosthetics, health monitoring, sensitive tactile information display, and robotics. In particular, many previous studies have reported flexible and highly sensitive pressure sensors. Among them, e-skin devices based on CNT microfibers show wearable and excellent multimodal (pressure, temperature, humidity, and presence of chemicals) sensing capabilities However, the low sensitivity of these devices at high pressures remains a critical issue. Here, we report on highly flexbile and sensitive e-skin devices prepared by carbon nanotube (CNT) microfibers hybridized with Au flowers, which were synthesized by electrochemical methods. First, we controlled the voltage and reaction time in order to optimize the surface morphology of the CNT microfibers. Next, we fabricated capacitive pressure sensors to elucidate the impact of Au flowers on the sensing capability of the CNT microfiber-based pressure sensors, especially in high pressure regimes. The sensors based on CNT microfibers with Au flowers showed fourfold higher sensitivity than did those without the Au flowers, due to the enhanced air traps between the Au flowers. Furthermore, this morphology of CNT microfibers with Au flowers demonstrated satisfactory repeatability and durability under high pressure.

Financial Panic and Exchange Rate Overshooting during Currency Crises

김소영,Sunghyun Henry Kim 한국국제경제학회 2007 International Economic Journal Vol.21 No.1

During currency crises, some currencies depreciate more than the post-crisis exchange rate level, which can be described as exchange rate overshooting. Previous studies have claimed that a tight monetary policy, represented by an increase in the interest rate, stabilizes an exchange rate by causing currency appreciation, thereby explaining overshooting. This paper tests the hypothesis that overshooting simply reflects the overreaction of investors due to financial panic during currency crises, regardless of subsequent domestic policies. Empirical results suggest that: (1) the positive relationship between monetary tightening and the overshooting measure is very sensitive to sample selection; and (2) the measure of financial panic has a significant and positive relationship with the measure of overshooting in non-European countries.

Fluent 모형을 이용한 대심도 배수터널 유입부의 통수능력 분석

김소영,김정수,윤세의,Kim,So Young,Kim,Jung Soo,Yoon,Sei Eui 한국방재학회 2014 한국방재학회논문집 Vol.14 No.2

최근 도심지역의 내수침수로 인한 침수피해를 저감시킬 수 있는 방안으로 대심도 배수터널의 설계 및 시공을 실시하고 있으나, 국내도시유역의 특성을 반영한 설계 및 시공기술에 관한 연구가 부족하다. 특히 유입유량의 흐름형상과 배제효율을 결정하는 낙차공의 중요 구조인 유입부에 대한 연구결과가 미흡한 실정이다. 그러므로 유입부의 형태 변화에 따른 흐름특성 및 통수능력의 분석 연구가 필요하다. 본 연구에서 3차원 수치모형인 Fluent 6.3 모형을 이용하여 대심도 배수터널 유입부 형태 변화에 따른 흐름특성을 비교 및 분석하였다. 또한 실험결과와 수치모의 결과를 비교 및 분석하여 유입부의 흐름특성 분석에 Fluent 6.3 모형의 적용성을 확인하였다. 유입부의 형태 변화(소용돌이형, 나선식, 접선식) 및 유입구의 경사 증가에 따른 흐름특성 분석 결과 유량배제효율은 접선식 유입부와 나선식 유입부가 거의 비슷하게 모의되었으나, 접선식 유입부가 나선식 유입부 보다 유입구의 경사 변화에 관계없이 안정적인 유입부의 통수능력을 나타내고 있다. 그러므로 국내 도시유역의 협소한 지하공간을 고려한 대심도 배수터널 유입부로는 접선식 유입부가 적합하다고 판단된다. Recently, the deep underground storm water tunnel for inundation reduction has been designed and constructed in urban areas. However, practical studies considering characteristics of domestic urban areas are insufficient. Especially, flow pattern and drainage capacity of intake structures are influenced by intake types of a drop shaft. Therefore, it is necessary to analyse flow characteristics and discharge capacity of the intake structure with change of intake types. The computational fluid dynamics (CFD) model, Fluent 6.3, was applied to investigate the flow characteristics of the drop shaft structure for various of intake types (scroll, spiral, and tangential). The Fluent model was carefully assessed by comparing simulated results with the experiment, and there was good agreement between them. The numerical simulation was carried out according to change in intake types and inlet slopes. The simulated results were showed that spiral and tangential-inlet were stably drained the rate of inflow into the drop shaft. However, the tangential-inlet was showed steady discharge capacity at intake regardless of variation of inlet slopes compared with the spiral-inlet. Therefore, the tangential-inlet was appropriate as inlet of the deep underground storm water tunnel that be able to install on narrowish underground space of urban areas.

남매에서 비슷한 시기에 발생한 Henoch-$Sch{\ddot{o}}nlein$ 자반증 2례

김소영,임인석,유병훈,Kim, So-Young,Lim, In-Seok,Yoo, Byoung-Hoon 대한소아신장학회 2000 Childhood kidney diseases Vol.4 No.2

저자들은 남매에서 3주 정도의 차이를 둔 비슷한 시기에 피부의 자반성 구진, 관절의 부종 및 관절통을 주소로 내원하여 HS 자반증으로 진단받은 두명의 환아를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Henoch-$Sch{\ddot{o}}nlein$ purpura(HSP) frequently follows upper respiratory infection, and one of the causes of this discase is inferred to $\beta$-hemolytic streptococcal infection, but the relationship is still unclear. familial tendency of this disease is unclear, too. Also genetic relationship of this disease has been in a controversy yet. We experienced two cases of HSP in brother and sister at similar period, and report this case with review of related literatures.

박태기나무의 잎으로부터 피부멜라닌 색소생성 억제성분의 분리

김소영,김진준,장태수,정시련,이승호,Kim, So-Young,Kim, Jin-Joon,Jang, Tae-Soo,Chung, See-Ryun,Lee, Seung-Ho 한국생약학회 1999 생약학회지 Vol.30 No.4

Tyrosinase plays an important role in the process of melanin polymer biosynthesis. Therefore, the enzyme inhibitors have been of great concern as cosmetics to have skin-whitening effects on the local hyperpigmentation. During the search for new inhibitory compounds on melanin polymer biosynthesis from natural sources, MeOH extracts of 589 higher plants were tested for the inhibitory effect on tyrosinase activity by the muschroom tyrosinase assay in vitro. Among plants tested, the leaves of Cercis chinensis exhibited potent inhibitory effect on mushroom tyrosinase activity. Subsequently seven active compounds were isolated from the ethyl acetate soluble part of acetone extract of the leaves of C. chinensis by the activity guided fractionation monitoring the inhibitory effect on tyrosinase activity. Their chemical structures were identified as $kaempferol-3-0-{\alpha}-L-rhamnoside$, quercitrin, $myricetin-3-0-{\alpha}-L-rhamnoside$, myricetin-3-0-(2'-O-galloyl)- ${\alpha}$ -L-rhamopyranoside (desmanthin), (-)-epicatechin-3-0-gallate, (-)-epigallocatechin-3-0-gallate, and methyl gallate on the basis of the speculation of spectral data and chemical reaction. Among the flavonol rhamnosides, myricetin-3-0-(2'-O-galloyl)- -L-rhamnoside(desmanthin) showed most potent inhibitory effect on tyrosinase activity and the structure of B-ring in flavonol moiety was related to the activity. (-)-Epigallocatechin-3-O-gallate having pyrogallol group in flavan-3-ol moiety exhibited more potent inhibitory effect than (-)-epicatechin-3-0-gallate having catechol group in flavan-3-ol moiety on mushroom tyrosinase activity.

태양광 물 분해를 통한 수소 생산용 Cu₂O/CuO 이종접합 광전극의 제작 및 광전기화학적 특성

김소영,김효진,홍순구,김도진,Kim, Soyoung,Kim, Hyojin,Hong, Soon-Ku,Kim, Dojin 한국재료학회 2016 한국재료학회지 Vol.26 No.11

We report on the fabrication and characterization of a novel $Cu_2O/CuO$ heterojunction structure with CuO nanorods embedded in $Cu_2O$ thin film as an efficient photocathode for photoelectrochemical (PEC) solar water splitting. A CuO nanorod array was first prepared on an indium-tin-oxide-coated glass substrate via a seed-mediated hydrothermal synthesis method; then, a $Cu_2O$ thin film was electrodeposited onto the CuO nanorod array to form an oxide semiconductor heterostructure. The crystalline phases and morphologies of the heterojunction materials were examined using X-ray diffraction and scanning electron microscopy, as well as Raman scattering. The PEC properties of the fabricated $Cu_2O/CuO$ heterojunction photocathode were evaluated by photocurrent conversion efficiency measurements under white light illumination. From the observed PEC current density versus voltage (J-V) behavior, the $Cu_2O/CuO$ photocathode was found to exhibit negligible dark current and high photocurrent density, e.g. $-1.05mA/cm^2$ at -0.6 V vs. $Hg/HgCl_2$ in $1mM\;Na_2SO_4$ electrolyte, revealing the effective operation of the oxide heterostructure. The photocurrent conversion efficiency of the $Cu_2O/CuO$ photocathode was estimated to be 1.27% at -0.6 V vs. $Hg/HgCl_2$. Moreover, the PEC current density versus time (J-T) profile measured at -0.5 V vs. $Hg/HgCl_2$ on the $Cu_2O/CuO$ photocathode indicated a 3-fold increase in the photocurrent density compared to that of a simple $Cu_2O$ thin film photocathode. The improved PEC performance was attributed to a certain synergistic effect of the bilayer heterostructure on the light absorption and electron-hole recombination processes.