http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
문승희,박수정,조현구,황윤찬,오원만,황인남 大韓齒科保存學會 2009 Restorative Dentistry & Endodontics Vol.34 No.4
본 연구는 순면 잔존 치질의 두께와 후방 복합레진의 색상이 최종 수복된 치아표면의 색상에 미치는 영향을 알아보고자 시행하였다. 배경판으로 사용될 복합레진은 Filtek Supreme (3M ESPE, St. Paul, U.S,A.)의 Al, A2, A6D, Bl, B2, B3,C1, C2 C6D를 선택하였다. 배경판으로 사용될 복합레진 시편은 직경 10 mm, 두께 4.5 mm로 각 shade당 한 개씩 제작하였다. 순면 잔존 치질은 상악 중절치 치관의 순면을 제외한 나머지 부위를 아크릴릭 레진을 이용하여 매몰 후 저속의 Diamond Wheel Saw (Isomet ; Buehler Ltd, Lake Bluff, U.S.A.)를 이용하여 주수 하에 순면으로부터 2.5 mm 두께로 절단하였다. 절단된 상아질측 표면을 2000번 사포로 연마하여 2.2 mm 두께의 시편을 얻었다. 분광광도계 Spectrolino^(Ⓡ) (Serial No. 3257-18522, GretagMacbeth, Regensdorf, Switzerland)를 이용하여 치아시편을 9개의 복합레진 시편위에 접촉면에 수분이 있는 상태로 위치시켜 치아 순면색상을 측정하였다. 그 후, 치아시편의 상아질 측면을 1.0 mm까지 0.3 mm 간격으로 연마하면서 복합레진 시편위에 위치시켜 동일한 방법으로 색상을 측정하였다. 모든 시편에서 L^(*)값과 b^(*)값은 배경색에 무관하게 치아시편의 두께가 두꺼워질수록 증가하는 양상을 보였으나(p <0.05), a^(*)값은 배경색에 무관하게 두께에 따른 유의한 차이를 보이지 않았다. In this study we evaluated the influence of both the thickness of residual enamel and the color of the composite resins applied to lingual surface on the labial surface color. Background plates were made by randomly (Al, A2, A6D, Bl, B2, B3, Cl, C2, C6D) selected colors of Filtek Supreme (3M ESPE, St. Paul, U.S.A.) composite resin. Crown portion of 9 maxillary central incisors were cut off and embedded with acrylic resin except labial surface. Samples of average thickness of 2.2 mm were obtained after cutting it in a thickness of 2.5 mm from the labial surface and sandpaper polish. The shade of composite resin background was measured using Spectrophotometer (Spectrolino^(Ⓡ), GretagMacbeth, Regensdorf, Switzerland). And CIE L^(*)a^(*)b^(*) value of 2.2 mm thickness tooth samples were measured on the 9 composite resin backgrounds. And then, the cutting side of tooth samples was ground to the extent of 1.9 mm, 1.6 mm, 1.3 mm, 1.0 mm and placed on composite resin backgrounds and measured L^(*)a^(*)b^(*) values with the same method. In all samples, L^(*) value and b^(*) value seemed to have a tendency of decreasing as thickness of tooth sample becomes thinner regardless of background colors (p < 0.05). But, a^(*) value didn't show the significant differences depending on the thickness.
Synthesis of a Low-Bandgap Fluorinated Donor–Acceptor Copolymer and Its Optoelectronic Application
Yun, Hui-Jun,Hwang, Moon Chan,Park, So Min,Kim, Ran,Chung, Dae Sung,Kim, Yun-Hi,Kwon, Soon-Ki American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.13
<P>We demonstrate the synthesis of a new copolymer which is composed of dialkyl thienylated benzodithiophene and perfluororalkyl-carbonyl thienothiophene (DTBDT-TTFO) and the characterization of its optoelectronic properties. The introduction of thienyl groups enabled the extended delocalization of π electrons in the DTBDT-TTFO backbone and efficient intermolecular charge transport as proved by the fairly high field effect mobility of 0.02 cm<SUP>2</SUP>/(V s). The introduction of perfluororalkyl-carbonyl side chains resulted in a significant red-shift of DTBDT-TTFO in the absorption spectra and a decrease in the HOMO and LUMO levels. The resulting energy levels of DTBDT-TTFO were not satisfactory for solar cell applications, especially in terms of charge separation at the polymer/PCBM interfaces. Rather, the DTBDT-TTFO showed better energy level matching with the colloidal nanocrystals (NCs) of CdSe. A photodetector based on the bulkheterojunction of DTBDT-TTFO and CdSe NCs with coplanar device geometry resulted in a high photoconductive gain (responsivity higher than 1A/W under a low operating voltage of 1 V), possibly arising from electron trapping at CdSe NCs such that the hole can travel along the detector and its surrounding circuit. More importantly, the photodetector revealed a time constant of a few hundreds of microseconds, which means that the response speed of the photodetector is fast enough for lag-free imaging applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-13/am4007935/production/images/medium/am-2013-007935_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am4007935'>ACS Electronic Supporting Info</A></P>
Anti-Helicobacter pylori effects of IgY from egg york of immunized hens
Yun-Hui Yang,Dongsun Park,Goeun Yang,Sun Hee Lee,Dae Kwon Bae,Jangbeen Kyung,Dajeong Kim,Ehn-Kyoung Choi,Jae-Cheol Son,Seock-Yeon Hwang,Yun-Bae Kim 한국실험동물학회 2012 Laboratory Animal Research Vol.28 No.1
Effects of egg york containing IgY specific for Helicobacter pylori on the bacterial growth and intragastric infection were investigated in comparison with a proton-pump inhibitor pantoprazole. For in vitro antibacterial activity test, H. pylori (1*108 CFU/mL) was incubated with a serially diluted IgY for 3 days. As a result, IgY fully inhibited the bacterial growth at 16 mg/mL, which was determined to a minimal inhibitory concentration. In vivo elimination study, male C57BL/6 mice were infected with the bacteria by intragastric inoculation (1*108 CFU/mouse) 3 times at 2-day intervals, and 2 weeks later, orally treated twice a day with 50, 100, 200 or 500 mg/kg IgY for 18 days. After the final administration, biopsy sample of the gastric mucosa was assayed for the bacterial identification via urease, oxidase, catalase, nitrate reduction and H2S tests in addition to microscopic examination for mucosal inflammation. In CLO kit test, 75, 50, 12.5 and 12.5% of the animals revealed positive reaction following treatment with 50, 100, 200 and 500 mg/kg IgY, respectively, resulting in a superior efficacy at 200 mg/kg than 30 mg/kg pantoprazole that displayed 75% elimination. The CLO test results were confirmed by bacterial identification. Microscopic examination revealed that H. pylori infection caused severe gastric mucosal inflammation, which were not observed in the CLO-negative mice following treatment with IgY or pantoprazole. Taken together, IgY inhibited the growth of H. pylori, and improved gastritis and villi injuries by eliminating the bacteria from the stomach. The results indicate that IgY could be a good candidate overcoming tolerance of antibiotics for the treatment of H. pylori-mediated gastric ulcers.
Yun, Hui-Jun,Park, Jong-Man,Jeon, Chan Woo,Nam, Sang Yong,Shin, Sung-Chul,Hwang, Jaeyoung,Kim, Yun-Hi American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.8
<P>A new poly(octathiophene) based copolymer was designed and synthesized by the palladium catalyzed Suzuki coupling reaction. The structure of the newly obtained copolymer was confirmed by 1H-NMR and IR. The number-average molecular weight (M(n)) of the polymer was 36,000 with a poly-dispersity index of 1.15. The polymer has good solubility in common solvents such as chloroform, toluene, chlorobenzene, dichlorobenzene and tetrahydrofuran at room temperature. The optical, thermal and electrochemical properties of the polymer were characterized by UV-vis absorption, TGA and DSC and cyclovoltametry, respectively. A thin film transistor using the new polymer as an organic semiconductor was found to exhibit typical p-channel FET characteristics with a hole mobility of 5 x 10(-4) cm2/Vs.</P>
CNT-PDMS 페인트 센서 표면 에칭에 따른 전기적 특성 분석
황희윤(Hui-Yun Hwang),정라희(La-Hee Jung) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this paper, we investigated the effect of wet-etching on the electrical characteristics of CNT-PDMS strain sensors. CNT-PDMS strain sensors consisted of MWCNTs and Polydemethylsyloxane according to the CNT wt%. For attaching metal electrodes on the strain sensor securely and decreasing the contact resistance, PDMS on the electrode area was removed by etching with NMP-TBAF solutions with respect to the etching duration. We fabricated the electrodes using sliver epoxy conducting adhesive and measured the electric resistance changes. Electrical conductivity increased as the MWCNT weight fraction and etching duration increased. Noticeable thing was that the electric conductivity of non-treated samples in log-scale increased order of 1 but those of etched samples increased order of 2 according to the CNT wt%. In addition, changes of electric conductivities from 2 to 3min of the etching duration were relatively small.