http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ryu, Jungho,Kim, Soonhyun,Hong, Hye-Jin,Hong, Jeongsik,Kim, Minsun,Ryu, Taegong,Park, In-Su,Chung, Kang-Sup,Jang, Jum Suk,Kim, Byoung-Gyu Elsevier 2016 Chemical engineering journal Vol.304 No.-
<P><B>Abstract</B></P> <P>Strontium ion (Sr<SUP>2+</SUP>) separation from seawater has attracted attention for radioactive pollutants removal and for Sr<SUP>2+</SUP> recovery. Herein, we synthesized titanate nanotubes (TiNTs) via a simple hydrothermal reaction, characterized their physicochemical properties, and systematically evaluated Sr<SUP>2+</SUP> sorption behavior under various reaction conditions corresponding to seawater environments. The synthesized TiNTs exhibited a fibril-type nanotube structure with a high specific surface area (260m<SUP>2</SUP>/g). Sr<SUP>2+</SUP> adsorption on TiNTs rapidly occurred following a pseudo-second-order kinetic model and was in good agreement with the Langmuir isotherm model, indicating a maximum adsorption capacity of 97mg/g. Based on the Sr<SUP>2+</SUP> uptake and Na<SUP>+</SUP> release with a stoichiometric balance, the Sr<SUP>2+</SUP> sorption mechanism on TiNTs was ion exchange between Na<SUP>+</SUP> in the TiNT lattice and Sr<SUP>2+</SUP> in the solution phase, as confirmed by XRD and Raman analysis. Among the competitive ions, Ca<SUP>2+</SUP> significantly hindered Sr<SUP>2+</SUP> sorption on TiNTs, whereas Na<SUP>+</SUP> only slightly affected Sr<SUP>2+</SUP> sorption, despite the Na<SUP>+</SUP> exchange sorption mechanism. The effect of Ca<SUP>2+</SUP> on Sr<SUP>2+</SUP> sorption was evaluated by introducing a distribution coefficient (<I>K<SUB>d</SUB> </I>) as a critical factor in determining the selectivity, which revealed a slightly higher selectivity for Sr<SUP>2+</SUP>. The Sr<SUP>2+</SUP> adsorption-desorption test in a real seawater medium enabled the determination of <I>K<SUB>d</SUB> </I> and the concentration factor (CF) for co-existing matrix ions in seawater; these values were evaluated for Sr<SUP>2+</SUP> removal and recovery from seawater. TiNTs were regenerated by acid treatment and reused through consecutive adsorption-desorption experiments. While most studies addressing Sr<SUP>2+</SUP> sorption using TiNTs aimed for extraction from wastewater and radioactive wastewater, this study elucidated Sr<SUP>2+</SUP> sorption behavior under seawater conditions and provided insights into developing the removal and recovery processes from seawater.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Titanate nanotubes (TiNTs) were synthesized by a simple hydrothermal reaction. </LI> <LI> The sorption of strontium (Sr) on TiNTs rapidly occurred, achieving Sr uptake 97mg/g. </LI> <LI> Na had little effect on Sr sorption despite the sorption mechanism of the Na exchange. </LI> <LI> Ca significantly hindered Sr sorption on TiNTs among co-existing cations in seawater. </LI> <LI> TiNTs could be easily regenerated by acid treatment and reused for repeated cycles. </LI> </UL> </P>
Ryu, Jungho,Kim, Soonhyun,Kim, Hyung Il,Jo, Eun-Hee,Kim, Young Kwang,Kim, Minsun,Jang, Hee Dong Elsevier 2015 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.262 No.-
<P><B>Abstract</B></P> <P>Spherical TiO<SUB>2</SUB> agglomerates incorporated with reduced-graphene oxide (rGO) sheets were fabricated using aerosol assisted self-assembly. Compared to that of conventional graphene–TiO<SUB>2</SUB> composites, the new hybrid geometry of the self-assembled agglomeration of TiO<SUB>2</SUB> and rGO enabled a porous structure, a more efficient charge separation through interconnected TiO<SUB>2</SUB> nanoparticles and rGO, and improved the contact between TiO<SUB>2</SUB> and rGO to maximize the role of rGO as an electron reservoir. The as-prepared rGO–TiO<SUB>2</SUB> composites were characterized with a diverse range of analytical techniques, and their photocatalytic activity was tested in terms of H<SUB>2</SUB> production and gaseous CH<SUB>3</SUB>CHO degradation. The incorporation of the rGO sheets into the TiO<SUB>2</SUB> agglomerates promoted the photocatalytic H<SUB>2</SUB> production and CH<SUB>3</SUB>CHO oxidation; our results showed that the performance of our systems is directly proportional to the content of rGO (when added up to 10wt%). This finding confirmed that rGO, acting as an electron collector and mediator, can facilitate charge-pair separation; only a small light-shielding effect by rGO was observed. Furthermore, open-circuit potential decay measurements revealed that the presence of rGO in the agglomerated TiO<SUB>2</SUB> can significantly suppress charge recombination; this further confirmed the role of rGO as an effective electron conduit. The new geometry of the rGO–TiO<SUB>2</SUB> composite proposed in this work shows several advantages compared to various types of graphene–TiO<SUB>2</SUB> composites previously reported, such as the stronger electronic coupling between rGO sheets and TiO<SUB>2</SUB>, minimized light-shielding effect by rGO (even when a relatively large amount of rGO is used), and facile scale-up for mass production. Therefore, our rGO–TiO<SUB>2</SUB> composite can be considered as a promising hybrid photocatalyst for solar energy conversion.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We developed new hybrid geometry of TiO<SUB>2</SUB> and reduced-graphene oxides. </LI> <LI> The new geometry of the rGO–TiO<SUB>2</SUB> was prepared by the self-assembled agglomeration. </LI> <LI> The rGO–TiO<SUB>2</SUB> composite exhibited the enhanced photocatalytic activity. </LI> <LI> The new geometry would be responsible for minimized light-shielding effect of rGO. </LI> <LI> The rGO–TiO<SUB>2</SUB> composite can be considered as a promising hybrid photocatalyst. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
국제 협업 연구를 위한 글로리아드(GLORIAD) 활용
이민선(Minsun Lee),오충식(Choongsik Oh),이형진(Hyungjin Lee),유진승(Jinseung Ryu),장행진(Haegjin Jang) 한국콘텐츠학회 2007 한국콘텐츠학회 종합학술대회 논문집 Vol.5 No.2_2
마이크로 칩의 저장능력은 매18개월마다 두 배로 늘어나고, 네트워크 속도 역시 매 9개월마다 두 배로 빨라진다고 하는 보고는 대용량의 데이터와 초고속네트워크를 필요로 하는 웅용 연구자들에게 있어 네트워크는 더 이상의 장애물이 아니며 동시에 이러한 응용연구자들의 연구가 네트워크속도의 발전을 더욱 가속화 시킨다고 할 수 있다. 지난2005년, 한국은 대전-시애틀과 대전-홍콩을 10기가 급의 광 네트워킹으로 연결하는 글로별 과학기술 협업연구망(GLORIAD)이 개통되면서 대용량의 데이터를 다루는 국내 응용연구자들이 네트워크 속도에 제한받지 않고 다양한 국제 협업연구에 참여할 수 있게 되었다. 본 논문에서는 글로리아드 망을 통해 진행되고 있는 국제 협업연구를 소개하고 특히 지난 슈퍼컴퓨팅 컨퍼런스(SC06) 기간 중에 진행된 VMT시연을 비롯하여, 고에너지물리 시연, 천문데이터전송 및 KISTI와 광주과학 기술원이 공동으로 개발한 저비용 고화질 비디오 재생시연 등을 소개한다. The Moore's law states that the number of transistors on a chip doubles about every 18 months. And it was reported that the network speed has been doubled about every 9 months. This indicates that computing power and network is no longer the obstacles for the high performance applications requiring terabits networks. We believe that the application motivates the network and vice versa. This presentation will introduce the GLORIAD which is the first ring network connecting six countries around the world and provides scientists with advanced networking tools that improve a communications and data exchange. The GLORIAD trans-Pacific link started its service on August 1, 2005. Since then, there has been remarkable demonstrations were performed through major conferences like Supercomputing Conference. This paper will introduce the global collaborative works on demonstrations of VMT, high energy physics, SDSS and HID video transmission during SC'06 in Tampa, FL.
보골지 추출물이 파골세포 분화 및 골흡수 관련 유전자 발현에 미치는 영향
류광현 ( Gwang-hyun Ryu ),김엄지 ( Eom Ji Kim ),김민선 ( Minsun Kim ),김재현 ( Jae-hyun Kim ),이유진 ( Yujin Lee ),진대환 ( Dae-hwan Jin ),손영주 ( Youngjoo Sohn ),정혁상 ( Hyuk-sang Jung ) 경락경혈학회 2021 Korean Journal of Acupuncture Vol.38 No.3
Objectives : The increase of osteoclasts could cause osteoporosis and bone-related diseases. Also, the inhibition of osteoclast differentiation is important in treating bone-related diseases. Traditionally, Psoraleae Semen has been used for geriatric diseases, aging and musculoskeletal diseases. The purpose of this study is to investigate the effect of Psoraleae Semen ethanol extract (PS) on osteoclast differentiation and its function. Methods : To confirm the effect of PS on osteoclastogenesis and bone resorption activity, various levels of concentrations of PS (5, 10, 20 and 40 μg/ml) were tested on RAW 264.7 cells cultured with RANKL. We measured tartarate-resistant acid phosphatase (TRAP)-positive cells, TRAP activity, pit formation and F-actin ring formation. The expressions of nuclear factor of activated T-cells (NFATc1) and c-Fos were confirmed through western blot and reverse transcription- polymerase chain reaction (RT-PCR). Also, the expression of bone resorption and fusion-related genes in osteoclast was confirmed by RT-PCR. Results : PS decreased the number of TRAP-positive cells and the TRAP activity. In addition, PS significantly inhibited the formation of pit and F-actin ring. Furthermore, PS decreased the expression of osteoclast related genes. Conclusions : PS inhibits osteoclast differentiation and bone resorption ability through inhibition of the expression of osteoclastrelated genes. This indicates that PS may be a potential therapeutic agent to osteoporosis by suppressing osteoclastogenesis.
Metformin inhibits early stage diethylnitrosamine-induced hepatocarcinogenesis in rats
JO, WOORI,YU, EUN-SIL,CHANG, MINSUN,PARK, HYUN-KYU,CHOI, HYUN-JI,RYU, JAE-EUN,JANG, SUNGWOONG,LEE, HYO-JU,JANG, JA-JUNE,SON, WOO-CHAN SPANDIDOS PUBLICATIONS 2016 MOLECULAR MEDICINE REPORTS Vol. No.
<P>Antitumor effects of metformin have recently emerged despite its original use for type II diabetes. In the present study, the effects of metformin on the development and recurrence of hepatocellular carcinoma (HCC) were investigated using the diethylnitrosamine (DEN)-induced rat model of HCC. Tumor foci were characterized by gross examination and by histopathological characteristics, including proliferation, hepatic progenitor cell content and the expression of hepatocarcinoma-specific molecular markers. Potential target molecules of metformin were investigated to determine the molecular mechanism underlying the inhibitory effects of metformin on chemically induced liver tumorigenesis. The antitumor effects of metformin were increased by the reduction of surface nodules and decreased the incidence of altered hepatocellular foci, hepatocellular adenoma and carcinoma. Also, decreased expression levels of glutathione S-transferase placental form, proliferating cell nuclear antigen and cytokeratin 8 described the inhibitory effects of metformin on HCC. In the present study, Wistar rats receiving treatment with DEN were administered metformin for 16 weeks. In addition, metformin suppressed liver tumorigenesis via an AMPK-dependent pathway. These results suggested that metformin has promising effects on the early stage of HCC in rats. Therefore, metformin may be used for the prevention of HCC recurrence following primary chemotherapy for HCC and/or for high-risk patients, including chronic hepatitis and cirrhosis.</P>