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Nd:YAG 레이저 照射에 따른 琺瑯質의 變化에 關한 實驗的 硏究
배태성,권선자,김철중,백병주 大韓小兒齒科學會 1992 大韓小兒齒科學會誌 Vol.19 No.2
The purpose of this study was to investigate the changes of polished and caries enamel of third molar when they were irradiated by the CW Nd : YAG laser with optical fiber delivery system and the pulsed Nd:YAG laser. The author investigated the hardness of lased enamel surfaces with the energy density of 40 J/㎠ and the shear bond strength between etched enamel and composite resin, and examined the polished and caries enamel surfaces irradiated by CW Nd : YAG laser with the energy density of 20-120 J/㎠ by using scanning electron microscope. The obtained results were summerized as follows : 1. The Knoop hardness decreased significantly after irradiating the Nd : YAG laser with the energy density of 40 J/㎠(P<0.01). 2. The shear bond strength of enamel showed a significant difference before and after irradiating the Nd : YAG laser with the energy density of 40 J/㎠(P>0.05). 3. SEM photographs showed the irregular microcracks and the structural change of lased enamel surface. 4. SEM photographs showed the aspect of decrease in decalcification of enamel prism after irradiated with the energy density of 40 J/㎠. 5. SEM photographs showed the aspect of removal in caries enamel when they were irradiated with the energy density of 70 J/㎠.
정전 열 접합을 이용한 Multi-Substrate Bonding
이덕중,주병권,최우범,한정인,조경익,이광배,장진,오명환 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
We performed silicon-to-glass bonding using silicon direct bonding followed by anodic bonding(SDAB). Initial bonding between glass and silicon was caused by the hydrophilic surfaces of silicon and glass ensemble using silicon direct bonding(SDB) method. We found that the bonded specimen using SDAB process had higher strength than one using anodic bonding process only. We performed multiple layer bonding by SDAB, which is glass- silicon -glass as sandwich structure. In the silicon wafer, the (1mm x 2mm x 500μm)-sized cavity was formed by the anisotropic etching of the silicon substrate in EPW(Ethylendiamin-Pyrocatechol-Water). And, the cavity was sealed with glass wafers by SDAB method.
박히준,채윤병,차웅석,박종배,이혜정,이향숙,인창식,고형균,김수영,최일환,김강식,문정배,배기태,유경환,육근영,정병주,손인철,임사비나 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2004 東西醫學硏究所 論文集 Vol.2004 No.-
Background : The cun measurement System, an essential and convenient method in locating acupoints, has been widely used in the practice of acupuncture. However, traditional cun measurement has been criticized for its lack of reliability. Objectives : The purposes of this study are to determine if one cun measured by the directional methods have a consistency with that of proportional methods and to investigate which factors are related with these differences, especially in forearm. Methods : The distance between the elbow crease and the wrist crease of forearm was compared to a reference value of one cun obtained by the directional method. In this method, one cun is one third of the distance between index finger and Small finger of a subject, measured at proximal interphalangeal joint. In addition, to investigate the factors influencing the differences between these two methods, we measured the height and body weight and calculated body mass index (BMI). Finally we analyzed the factors correlated with these lengths by linear regression test. Results : The results showed that one cun obtained by the directional methods were significantly different from one cun by the proportional methods in forearm. It was demonstrated that the length acquired with the directional method was more correlated with body weight and body mass index, while the length obtained by the proportional method was more correlated with the height.
CRISPR/Cas9-mediated knockout of NKX3.1 leads to adenoma and hyperplasia in prostate of C57BL/6 mice
Jin Ju Park,Ji Won Park,Ji Eun Kim,Mi Rim Lee,Jun Young Choi,Bo Ram Song,Hye Ryeong Kim,Byeong Cheol Kang,Dae Youn Hwang,Mi Ju Kang,Su Ji Bae,Hyeon Jun Choi,Yu Sang Choi,Young Ju Lee,Jun Go 한국실험동물학회 2019 한국실험동물학회 학술발표대회 논문집 Vol.2019 No.1
Bae, Hagyoul,Jun, Sungwoo,Kim, Choong-Ki,Ju, Byeong-Kwon,Choi, Yang-Kyu IOP 2018 Journal of Physics. D, Applied Physics Vol.51 No.10
<P>Few-layer molybdenum disulfide (MoS<SUB>2</SUB>) has attracted a great deal of attention as a semiconductor material for electronic and optoelectronic devices. However, the presence of localized states inside the bandgap is a critical issue that must be addressed to improve the applicability of MoS<SUB>2</SUB> technology. In this work, we investigated the density of states (DOS: <I>g</I>(<I>E</I>)) inside the bandgap of MoS<SUB>2</SUB> FET by using a current–voltage (<I>I</I>–<I>V</I>) analysis technique with the aid of high vacuum annealing (HVA). The <I>g</I>(<I>E</I>) can be obtained by combining the trap density and surface potential (<I>ψ</I> <SUB>S</SUB>) extracted from a consistent subthreshold current (<I>I</I> <SUB>D-sub</SUB>). The electrical performance of MoS<SUB>2</SUB> FETs is strongly dependent on the inherent defects, which are closely related to the <I>g</I>(<I>E</I>) in the MoS<SUB>2</SUB> active layer. By applying the proposed technique to the MoS<SUB>2</SUB> FETs, we were able to successfully characterize the <I>g</I>(<I>E</I>) after stabilization of the traps by the HVA, which reduces the hysteresis distorting the intrinsic <I>g</I>(<I>E</I>). Also, the change of sulfur ions in MoS<SUB>2</SUB> film before and after the HVA treatment is investigated directly by Auger electron spectroscopy analysis. The proposed technique provides a new methodology for active channel engineering of 2D channel based FETs such as MoS<SUB>2</SUB>, MoTe<SUB>2</SUB>, WSe<SUB>2</SUB>, and WS<SUB>2</SUB>.</P>
Ju Kyoung Song,Jin Tae Hong,Mi Ran Jo,Mi Hee Park,Ho Sueb Song,Byeong Jun An,Min Jong Song,Sang Bae Han 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.5
Snake venom toxin from Vipera lebetina turanica induces apoptosis in many cancer cell lines, but there is no study about the apoptotic effect of snake venom toxin on human ovarian cancer cells. In this study, we investigated the apoptotic effect of snake venom toxin in human ovarian cancer PA-1 and SK-OV3 cells. Snake venom toxin dose dependently (0~10 μg/mL) inhibited ovarian cancer cell growth with IC50 values 4.5 μg/mL in PA-1 cells, and 6.5 μg/mL in SKOV3 cells. Our results also showed that apoptotic cell death increased by snake venom toxin in a dose dependent manner (0~10 μg/mL). Consistent with increased cell death, snake venom toxin increased the expression of pro-apoptotic protein Bax and caspase-3, but down-regulated anti-apoptotic protein Bcl-2. Untreated ovarian cancer cells showed a high DNA binding activity of nuclear factor B (NF-κB), but it was inhibited by snake venom toxin accompanied by inhibition of p50 and p65 translocation into the nucleus as well as phosphorylation of inhibitory κB. Snake venom toxin also inhibited DNA binding activity of the signal transducer and activator of transcription 3 (STAT3). Moreover, the combination treatment of NF-κB (salicylic acid, 1 or 5 μM) and STAT3 (stattic, 1 μM) with snake venom toxin (1 μg/mL) further enhanced cell growth inhibitory effects of snake venom toxin. These results showed that snake venom toxin from Vipera lebetina turanica caused apoptotic cell death of ovarian cancer cells through the inhibition of NF-κB and STAT3 signal, and suggested that snake venom toxin may be applicable as an anticancer agent for ovarian cancer.
Bae, Bong Han,Jun, Sungwoo,Kwon, Min Sung,Park, Young Wook,Han, Chul Jong,Kim, Seong-Il,Ju, Byeong-Kwon Elsevier 2019 Optical materials Vol.92 No.-
<P><B>Abstract</B></P> <P>A light extraction structure and a flexible electrode have been developed to enhance the electroluminescence (EL) efficiency of flexible organic light-emitting diodes (FOLEDs). However, these structures are still influenced by optical losses, poor electrical stability, and low throughput, and are not suitable to be adopted into FOLEDs due to the surface roughness problem, low flexibility/adhesion, complicated process, and high temperature/pressure process. Here, to solve these problems, we demonstrate embedded Ag nanowires (AgNWs) in flexible substrate and highly flexible random nano pattern via easy/low-cost solution form process at atmospheric pressure and low temperature without any additional material. This study demonstrates an internal and external light extraction structure composed of double-sided nano-dimpled substrate PVB (DndP), which is directly fabricated on both sides of a flexible substrate (polyvinyl butyral, PVB) only in itself without additional material via the easy/low-cost transferring process using the anodic aluminum oxide (AAO) template by an anodization process-based solution form at atmospheric pressure and low temperature. Therefore, because the DndP and the substrate are composed of the same material, PVB, there is no light loss between their interfaces. In addition, a high-refractive-index TiO<SUB>2</SUB> nanoparticle, for the scattering effect, and AgNWs, for electrode flexibility, are embedded into the DndP via the covering method using the solution form. Such structures exhibit extraordinary mechanical flexibility due to the AgNWs embedded in the PVB substrate. Therefore, FOLEDs using such structures can be well adapted to flexible/rollable/foldable displays and wearable application devices. Moreover, the corrugated surface of FOLEDs by such structures can improve the current flow through increased surface area of electrodes and extract the trapped light through the scattering effect (Rayleigh, Mie), reducing the total reflection and coupled photon in metal/dielectric. In addition, the FOLEDs with such structures show color/spectrum-stable property and independence of viewing angles owing to their random nature. The final green FOLEDs with DndP, embedded scattering TiO<SUB>2</SUB> nanoparticle, and embedded AgNWs&PEDOT:PSS demonstrate an outstanding EL efficiency enhancement ratio of 2.23 time via internal and external light extraction without electrical short.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Demonstration of double-sided nano-dimpled substrate (PVB) as internal and external light extraction structure to improve electroluminescence efficiency of flexible organic light-emitting diodes. </LI> <LI> Using easy/low-cost transferring process and anodization process-based solution form at atmospheric pressure and low temperature without additional material. </LI> <LI> Embedded high-refractive-index TiO<SUB>2</SUB> nanoparticle in PVB substrate to improve scattering effect. </LI> <LI> Embedded Ag nanowires (AgNWs) in PVB substrate to solve flexibility/adhesion/surface roughness problem of device. </LI> </UL> </P>