http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Synthesis and electroluminescent properties of diazocine derivatives
Ryu, Jaemin,Jo, Min-Jin,Jung, Hyocheol,Lee, Hayoon,Shin, Donghee,Park, Miyeon,Kay, Kwang-Yol,Park, Jongwook Informa UK (TaylorFrancis) 2017 Molecular Crystals and Liquid Crystals Vol.651 No.1
<P>Four new diazocine derivatives including anthracene moiety, 2,8-Bis-[3-(10-naphthalen-2-yl-anthracen-9-yl)-phenyl]-6H,12H-5, 11-methano-dibenzo[b,f][1,5]diazocine(AK14), 2,8-Bis-[2-(10-naphthalen-2-yl-anthrac-en-9-yl)-phenyl]-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine(AK15), 2,8-Bis-[4-(10-phenyl-anthracen-9-yl)-phenyl]-6H,12H-5,11-methano-dib-enzo[b,f][1,5]diazocine(AK20), 2,8-Bis-[2-(10-phenyl-anthracen-9-yl)-ph-enyl]-6H,12H-5,11-methano-dibenzo[b,f][1,5]diazocine(AK21) were synth-esized. Those materials exhibited photoluminescence (PL) maximum value of about 411 approximate to 428nm in solution state and 429 approximate to 483nm in film state, respectively.Four compounds were used as EML in OLED device: ITO / 2-TNATA (60nm) / NPB (15nm) / EML (35nm) / Alq3 (20nm) / LiF / Al. OLED devices, fabricated by AK14, AK20 and AK21, showed the current efficiency with 2.16cd/A, 0.28cd/A and 1.56cd/A. The OLED device, fabricated by AK15, showed the best performance with 2.83cd/A, 1.25lm/W and CIE(x,y) = (0.16, 0.23).</P>
고체추진 핀틀 추력기의 저주파 비음향 불안정 해석에 관한 연구
이동희(Donghee Lee),주성민(Seongmin Joo),김준성(Junseong Kim),류승현(Seunghyun Ryu),성홍계(Honggye Sung),문희장(Heejang Moon),양준서(Juneseo Yang) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
핀틀 추력기는 노즐목 면적의 변화로 추력제어를 함으로써 자세제어 및 궤도천이가 가능한 고체로켓 시스템이다. 고체로켓 시스템은 고고도(high altitude)에서 낮은 압력으로 운영되며 이 경우 L<SUP>*</SUP> 불안정이 나타날 수 있다. 본 연구는 대표적인 저주파 비음향 불안정인 L<SUP>*</SUP> 불안정 이론을 고체추진 핀틀 추력기에 적용하여 연소실의 L<SUP>*</SUP> 안정도 판별에 대한 연구를 수행하였다. 핀틀 추력기의 설계 파라미터와 추진제 물성치를 이용하여 L<SUP>*</SUP> 안정도 판별 곡선을 도출하였고 핀틀 위치가 0 mm, 10 mm, 20 mm, 30 mm, 40 mm일 때 추력기의 L<SUP>*</SUP> 안정도를 판단하였다. 또한, 추력기의 L<SUP>*</SUP> 불안정 임계점을 파악하였으며 이에 따른 핀틀의 안정적인 구동 범위를 제시하였다. A study of L<SUP>*</SUP> instability, a common low-frequency non-acoustic instability, was investigated and applied to a solid propellant pintle thruster. Parameters of the thruster chamber and propellant are used to fraw the L<SUP>*</SUP> stability criteria curve, which will determine the L<SUP>*</SUP> stability at each position of the pintle(0 mm, 10 mm, 20 mm, 30 mm, 40 mm). Results show the critical point and proposes a stable operating range of the pintle.
Lee, Donghee,Ryu, Kwon-Yul Elsevier 2017 Biochemical and biophysical research communication Vol. No.
<P><B>Abstract</B></P> <P>The polyubiquitin genes <I>Ubb</I> and <I>Ubc</I> are upregulated under oxidative stress induced by arsenite [As(III)]. However, the role of ubiquitin (Ub) under As(III) exposure is not known in detail. In a previous study, we showed that the reduced viability observed in <I>Ubc</I> <SUP>−/−</SUP> mouse embryonic fibroblasts under As(III) exposure was not due to dysregulation of the Nrf2–Keap1 pathway, which prompted us to investigate another NFE2 family protein, nuclear factor erythroid 2-related factor 1 (Nrf1). In this study, we found that Ub deficiency due to <I>Ubc</I> knockdown in N2a cells reduced cell viability and proteasome activity under As(III) exposure. Furthermore, mRNA levels of the proteasome subunit <I>Psma1</I> were also reduced. In addition, Ub deficiency led to the nuclear accumulation of the p65 isoform of Nrf1 under As(III) exposure. Interestingly, the overexpression of p65-Nrf1 recapitulated the phenotypes of Ub-deficient N2a cells under As(III) exposure. On the other hand, <I>Nrf1</I> knockdown suppressed the death of Ub-deficient N2a cells upon exposure to As(III). Therefore, the levels of p65-Nrf1 may play an important role in the maintenance of cell viability under oxidative stress induced by As(III).</P> <P><B>Highlights</B></P> <P> <UL> <LI> N2a cells exhibit reduced viability upon exposure to As(III) via <I>Ubc</I> knockdown. </LI> <LI> As(III)-induced proteasomal regulation is impaired in Ub-deficient N2a cells. </LI> <LI> Ub deficiency leads to the nuclear accumulation of p65-Nrf1 under As(III) exposure. </LI> <LI> p65 expression recapitulates As(III)-induced phenotypes of Ub-deficient N2a cells. </LI> <LI> <I>Nrf1</I> knockdown suppressed As(III)-induced death of Ub-deficient N2a cells. </LI> </UL> </P>
Change of inspired oxygen concentration in low flow anesthesia
김지욱,Kang Donghee,Lee Hochul,Ryu Sungwon,Ryu Siejeong,Kim Doosik 대한마취통증의학회 2020 Anesthesia and pain medicine Vol.15 No.4
Background: There are several advantages of low flow anesthesia including safety, economics, and eco-friendliness. However, oxygen concentration of fresh gas flow and inspired gas are large different in low flow anesthesia. This is a hurdle to access to low flow anesthesia. In this study, we aimed to investigate the change in inhaled oxygen concentration in low flow anesthesia using oxygen and medical air.Methods: A total of 60 patients scheduled for elective surgery with an American Society of Anesthesiologist physical status I or II were enrolled and randomly allocated into two groups. Group H: Fresh gas flow rate (FGF) 4 L/min (FiO₂ 0.5). Group L: FGF 1 L/min (FiO₂ 0.5). FGF was applied 4 L/min in initial phase (10 min) after intubation. After initial phase FGF was adjusted according to groups. FGF continued at the end of surgery. Oxygen and inhalation anesthetic gas concentration were recorded for 180 min at 15 min interval.Results: The inspired oxygen concentration decreased by 5.5% during the first 15 min in the group L. Inspired oxygen decreased by 1.5% during next 15 min. Inspired oxygen decreased by 1.4% for 30 to 60 min. The inspired oxygen of group L is 35.4 ± 4.0% in 180 min. The group H had little difference in inspired oxygen concentration over time and decreased by 1.8% for 180 min.Conclusions: The inspired oxygen concentration is maintained at 30% or more for 180 min in patients under 90 kg. Despite some technical difficulties, low flow anesthesia may be considered.
Kim, Hye Young,Lee, Donghee,Ryu, Kwon-Yul,Choi, Inhee unknown 2017 Chemical communications Vol. No.
<P>Herein, we report a rapid in vitro assay of amyloid beta anti-aggregation reagents using gold nanoparticles as nucleation cores and optical reporters. Based on the colorimetric responses observed with the naked eye, effective anti-aggregation reagents were rapidly (<15 min) distinguished. For these reagents, conventional methods showed fewer amyloid b aggregates and an increased viability of neuroblastoma cells after treatment. We envision that our proposed method will facilitate the discovery of efficient drug components for the treatment of Alzheimer's disease.</P>
Shin, Dongguen,Kang, Donghee,Lee, Jae-Bok,Ahn, Jong-Hyun,Cho, Il-Wook,Ryu, Mee-Yi,Cho, Sang Wan,Jung, Na Eun,Lee, Hyunbok,Yi, Yeonjin American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.18
<P>The interfacial properties of organolead halide perovskite solar cells (PSCs) affect the exciton and charge-transport dynamics significantly. Thus, proper modification of the interfaces between perovskite and charge-transport layers is an efficient method to increase the power conversion efficiency (PCE) of PSCs. In this work, we explore the effect of a nonionic surfactant, that is, Triton X-100 (TX) additive, in the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) hole-transport layer. The electronic structure of TX-modified PEDOT:PSS is investigated with ultraviolet/X-ray photoelectron spectroscopy and X-ray absorption spectroscopy with various TX concentrations. The surface of the TX-modified PEDOT:PSS layer showed high TX content, and thus the semimetallic properties of PEDOT:PSS were suppressed conspicuously by its insulating nature. With the TX-modified PEDOT:PSS, the PCE of methylammonium lead iodide (MAPbI<SUB>3</SUB>) PSCs increased significantly. To elucidate the origin of the improved device performance, the electrical properties and photoluminescence were investigated comprehensively. Consequently, it was found that the TX additive inhibits interface recombination between PEDOT:PSS and MAPbI<SUB>3</SUB>, which is caused by the suppression of semimetallic properties of the PEDOT:PSS surface. Hence, we fabricated flexible PSCs successfully using a graphene electrode and TX-modified PEDOT:PSS.</P> [FIG OMISSION]</BR>