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Octave-spanning supercontinuum generation in infrared by MoS2-filled hollow core fiber
Kim Hyo-suk,조영호,Park Byeongho,Park Subeen,Lee Kwanil,Ryu Yong-Sang,Kim Chulki,Lee Taikjin,Song Hyun Seok,Woo Deok Ha,Kim Jae Hun,Kim Hyo-suk,Chung Youngchul,Kim Hyung Min 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.11
We report the generation of an infrared (IR) supercontinuum spanning over an octave using a centimeter (6 cm) length of photonic crystal fiber (PCF) filled with MoS2, which has a considerably large nonlinear refractive index. The fiber is pumped with a femto-second laser pulse with an infrared wavelength of 2080 nm, pumping intensity of 336.76 GW/cm2, peak power of 0.75 GW, and pulse width of 150 fs. With the assistance of highly nonlinear MoS2, a supercontinuum bandwidth that remarkably extends from 1400 to 2700 nm below 20 dB is achieved. This supercontinuum bandwidth significantly exceeds the previously reported spectra for other nonlinear glass-based optical fibers, even with a fairly short fiber length. Furthermore, this short fiber length allows PCF to be more efficiently utilized, and is expected to be suitable for various applications, such as broadband light source through liquid-based fibers and waveguide-based optical communications, especially in the IR region.
Metabolic syndrome as a risk factor for gestational diabebes mellitus
( Subeen Hong ),( Seung Mi Lee ),( So Yeon Kim ),( Ja Nam Koo ),( Ig Hwan Oh ),( Byoung Jae Kim ),( Sun Min Kim ),( Chan-wook Park ),( Jong Kwan Jun ),( Joong Shin Park ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Objective: Establishing the high risk group of DM in pregnancy is so important in terms of the early diagnosis and the intervention for the prevention of the complications of GDM. Metabolic syndrome is a cluster of metabolic abnormalities and GDM was regarded as a risk factor of metabolic syndrome for women and their offspring. However, there is not enough information about the influence of having metabolic syndrome at the early pregnancy period on GDM. In this study, we evaluated the effect of the metabolic syndrome on the risk of GDM. Methods: Metabolic syndrome was diagnosed by the National Cholesterol Education Program-Adult Treatment Panel III (NECP-ATP III) criteria. The maternal fasting blood sample was taken and measured for laboratory parameters at 10-14 weeks of gestation. GDM was diagnosed by the two step approaches, which are universal screening using 50g oral glucose tolerance test (OGTT) and then following 100g OGTT. The odds ratios of metabolic syndrome and the each component of metabolic syndrome were calculated by logistic regression analysis. Results: Among 913 pregnant women, 47 (5.1%) women was diagnosed for GDM and 12 (1.3%) women with GDM were managed on insulin. Women with metabolic syndrome had increased risk of GDM and insulin-treated GDM. [OR 11.09 (3.91-31.43) for GDM, OR 28.23 (7.77-102.53) for insulin-treated GDM]. Among the component of metabolic syndrome, impaired fasting glucose had the highest odds for GDM. [OR 24.51 (8.47-70.95)] The significance of metabolic syndrome as a risk factor for GDM remained after adjustment for age, body mass index, family history of diabetes and previous GDM (p<0.05). Conclusion: Metabolic syndrome is a significant risk factor for GDM. Evaluation for having metabolic syndrome at the first prenatal visit of pregnant women will be helpful for assessing the risk for development of GDM.
Controllable one-step double emulsion formation <i>via</i> phase inversion
Kim, Subeen,Kim, KyuHan,Choi, Siyoung Q. The Royal Society of Chemistry 2018 SOFT MATTER Vol.14 No.7
<P>Double emulsions, the simplest form of multiple emulsion, have been intensively utilized in various industries as well as in fundamental research. A variety of strategies to effectively form double emulsions have been developed, but no simple yet controlled and scalable technique has been achieved yet. Herein, we examine the mechanism of the entire process of double emulsion formation by phase inversion, and we propose a universal one-step strategy for the formation of an oil/water/oil double emulsion using oil soluble polymers and hydrophobic silica nanoparticles. We demonstrate that this new approach enables control of both the fraction and the number of inner small droplets; even high internal phase double emulsions could be achieved.</P>
Kim, Myungjin,Yu, Subeen,Kim, Jeung Gon,Lee, Sunwoo The Royal Society of Chemistry 2018 ORGANIC CHEMISTRY FRONTIERS Vol.5 No.16
<P>Thioesters were synthesized <I>via</I> palladium-catalyzed carbonylation of thioacetates and aryl iodides. <I>S</I>-Aryl thioacetates coupled with carbon monoxide and aryl iodides to afford the desired <I>S</I>-aryl thioesters in good yields. The reaction showed good functional group tolerance toward fluoro, chloro, ketone, ester, aldehyde, cyano, and nitro groups. The tandem reaction of the direct <I>S</I>-arylation of aryl iodides from potassium thioacetate (KSAc) and subsequent carbonylation of the intermediates <I>S</I>-aryl thioacetates provided <I>S</I>-aryl thioesters in moderate-to-good yields.</P>
김수빈(Kim, Subeen) 한국고고학회 2020 한국고고학보 Vol.0 No.114
일본의 원통하니와(圓筒埴輪)와 기형이 유사한 ‘원통형토기’는 장송의례의 목적으로 제작된 토기로 한반도에서는 주로 영산강 유역의 분묘 유적을 중심으로 출토되는 양상을 보이고 있다. 일부 선행 연구에서 제작 기법을 언급하거나 실험고고학을 통하여 제작 공정을 복원하였지만, 대부분이 속성 연구에 치중되어 고고학적 접근에 한계를 드러내 왔다. 본고에서는 이러한 선행 연구를 보완하고자 출토 사례가 증가하고 있는 영산강 유역의 자료를 대상으로 선정하여, 원통형토기의 제작 기법을 분석한 내용을 바탕으로 제작 집단의 성격을 추정해 보았다. 전체적으로 외형에 영향을 주는 투창이나 돌대 등 장식적인 요소가 거의 관찰되지 않는 I식 원통형토기는 정립 기법과 분할정립 기법을 중심으로 제작되었다. 획일적이지 않고 다양한 기형이 확인되며 같은단계에서도 다른 제작 기법을 이용하여 만들어진 원통형토기가 출현하기도 한다. 따라서 I식은 중앙의 통제를 받지 않은 재지세력을 중심으로 ‘독립적으로 전문화’된 비전업-반전업의 성격을 띠는 공인이 제작하였다고 추정되므로 외부 영향적인 의미보다는 자생적인 의미에 초점을 두어야 할 것이다. II식 원통형토기는 분할도립 기법과 도립 기법이 관찰되며, I식과 단계적으로는 이어지지만 기형과 성형 기법 및 소성도에서 큰 차이를 보이기 때문에 계승 관계가 없다고 판단된다. 또한 수량이 증가하며 획일성이 높아지기 때문에 중앙과 관련있는 일련의 생산 시스템을 공유한 ‘부속된 전문화’적인 전업의 성격을 띠는 공인이 제작하였다고 추정된다. Cylindrical pottery (圓筒形土器) was made for a special purpose, similar to that of the Japanese Entou-Haniwa (円筒埴輪). Cylindrical pottery is usually found around the burial sites of the Yeongsan River basin. Cylindrical pottery can be divided into Types I and II, based on the lower section, which best illustrates chronological characteristics. Type I cylindrical pottery has a variety of forms, with relatively small quantities excavated per site. It is believed to have been made within a socio-political production system that was not subject to central control. The Type II cylindrical pottery witnessed a transition from the upside-down technique (倒立技法) to the partial upside-down technique (分割倒 立技法). Because these production techniques appear to be very similar in each stage the production of these vessels may have been conducted under central political control. The production of cylindrical pottery, which utilized the upside-down technique (倒立技法), was similar to the way in which a large jar coffins were constructed in the Yeongsan River basin, suggesting that the group producing the pottery was aware of the existence of keyhole- shaped tombs. This paper is meaningful in that it provides data gained from systematic research based on archaeological verification by observing the cylindrical pottery of the Yeongsan River basin.
김수빈(Subeen Kim),이윤구(Yoon Koo Lee),송지환(Jihwan Song) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Potassium has a low standard redox potential K/K⁺ and similar chemical properties to lithium. These advantages of K+ make Potassium-ion batteries (PIBs) a possible alternative to Lithium-ion batteries (LIBs). However, the material properties of potassium-intercalated graphite intercalation compounds (K-GICs) have not been sufficiently investigated to accurately estimate the performance of PIBs. When K+ atoms are intercalated into graphite, first-principles calculations based on density function theory (DFT) were performed to investigate the electronic structure, mechanical properties, and K⁺ migration of KC<SUB>8n</SUB> (n = 1, 2, and 3). In addition, the performance of PIBs is calculated using an electrochemical model via finite element method simulations. We have established a direct computational link between the atomic-scale material properties of K-GICs and the electrode-scale performance of PIBs. This will allow for a more accurate performance evaluation of PIBs.