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Dual sensitization of MWCNTs by co-decoration with p- and n-type metal oxide nanoparticles
Choi, Myung Sik,Bang, Jae Hoon,Mirzaei, Ali,Na, Han Gil,Kwon, Yong Jung,Kang, Sung Yong,Choi, Sun-Woo,Kim, Sang Sub,Kim, Hyoun Woo Elsevier 2018 Sensors and actuators. B Chemical Vol.264 No.-
<P><B>Abstract</B></P> <P>We present a dual sensitization gas sensor for selective detection of either H<SUB>2</SUB>S or C<SUB>2</SUB>H<SUB>5</SUB>OH gases, based on ZnO/CuO nanoparticle (NP)-decorated MWCNTs. First, Cu-Zn layers of three different thickness (3, 6, 9 nm) were successfully deposited on the surfaces of CNTs by a sputtering process and subsequently converted to their corresponding oxides by thermal annealing. The gas sensing characteristics of metal oxide decorated-MWCNTs were studied in the presence of three gases, namely NO<SUB>2</SUB>, H<SUB>2</SUB>S, and C<SUB>2</SUB>H<SUB>5</SUB>OH. The best sensing properties were obtained when the Cu-Zn deposition layer was 6 nm thick. The optimized sensor showed extraordinary responses to both H<SUB>2</SUB>S and C<SUB>2</SUB>H<SUB>5</SUB>OH gases at working temperatures of 100 °C and 200 °C, respectively. Therefore, selectivity was tuned by selection of the working temperature. The sensing mechanisms of the metal oxide-decorated CNTs sensors are discussed in detail. The approach described, namely co-decoration of the surfaces of MWCNTs with different metal oxides, will be of great utility to researchers who wish to fabricate dual sensitive gas sensors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We present a dual sensitization sensor for selective detection of either H<SUB>2</SUB>S or C<SUB>2</SUB>H<SUB>5</SUB>OH gases. </LI> <LI> Dual sensitization was devised, where two different metal oxides are added to the host material. </LI> <LI> The possible sensing mechanisms of the metal oxide-decorated CNTs sensors are discussed. </LI> </UL> </P>
Sang Un Park,Deok-Jong Ahn,Hyeon-Jeong Jeon,Tae Ryong Kwon,Hyoun-Sub Lim,Bo-Seong Choi,Kwang-Hyun Baek,Hanhong Bae 고려인삼학회 2012 Journal of Ginseng Research Vol.36 No.2
An light-emitting diode (LED)-based light source was used as a monochromatic light source to determine the responses of raw ginseng roots (Panax ginseng Meyer) to specifi c emission spectra with respect to the production of ginsenosides. The ginsenoside content in the ginseng roots changed in response to the LED light treatments at 25℃ relative to the levels in the control roots that were treated in the dark or at 4℃ for 7 d. Ginseng roots were exposed to LEDs with four different peak emission wavelengths, 380, 450, 470, and 660 ㎚, in closed compartments. Compared with the control 4℃-treated roots, roots that were treated with 450 and 470 ㎚ light showed a signifi cantly increased production of ginsenosides (p<0.05), with increases of 64.9% and 74.1%, respectively. The contents of the ginsenosides Rb2, Rc, and Rg₁ were signifi cantly higher (p<0.05) in the 450 and 470 ㎚-treated root samples. The ratio of protopanaxadiol ginsenosides (Rb₁, Rb₂, Rc, and Rd) to protopanaxatriol ginsenosides (Rg₁, Rg₂, Re, and Rf) was signifi cantly higher (p<0.05) in the 450 and 470 ㎚-treated root samples than in the control 4℃-treated roots. This is the fi rst report that demonstrates the increase and conversion of ginsenosides in raw ginseng roots in response to exposure to LED light.
( Sung-eun Choi ),( Dong-jin Park ),( Ji-hyoun Kang ),( Kyung-eun Lee ),( Haimuzi Xu ),( Ji Shin Lee ),( Yoo-duk Choi ),( Shin-seok Lee ) 대한류마티스학회 2019 대한류마티스학회지 Vol.26 No.1
Objective. Although intravenous cyclophosphamide (IVC) is generally accepted as the standard therapy for induction treatment of active proliferative lupus nephritis (LN), several clinical trials have suggested that mycophenolate mofetil (MMF) is at least as effective as IVC. Because few Asian studies have compared the two treatment modalities, we compared the efficacies of MMF and IVC as LN remission induction treatments in Korean patients. Methods. We enrolled 39 patients with class III and IV LN who received MMF or IVC as LN induction therapy. The renal outcomes (i.e., complete response [CR], partial response [PR], and no response [NR]) at 6 and 12 months were defined using the ACR 2006 response criteria. Results. Of 39 patients, 23 (59.0%) were treated with IVC, and 16 (41.0%) were treated with MMF. Demographics, clinical characteristics, laboratory data, and adverse events did not significantly differ between the two groups. However, C3 levels were lower and activity scores in renal biopsy were higher in IVC-treated patients. CRs were achieved by 11 (47.8%) of the patients receiving IVC and 7 (43.8%) of the patients receiving MMF after 6 months of treatment (p=0.961) and by 11 (47.8%) of those who received IVC and 9 (56.2%) of those who received MMF at 12 months of treatment (p=0.713). Neither the PR rate nor the NR rate differed significantly at 6 or 12 months between the two groups. Conclusion. The efficacy of MMF does not differ from that of IVC in terms of induction of LN remission in Korean patients. (J Rheum Dis 2019;26:57-65)
The Analysis of Characteristics in Dry and Wet Environments of Silicon Nanowire-Biosensor
Choi, Hyoun Mo,Shin, Dong Jae,Lee, Jung Han,Mo, Hyun-Sun,Park, Tae Jung,Park, Byung-Gook,Kim, Dong Myong,Choi, Sung-Jin,Kim, Dae Hwan,Park, Jisun American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.5
<P>Our study investigates differences in sensitivity of dry and wet environment in the field of biosensing experiment in detail and depth. The sensitivity of biosensing varies by means of surrounding conditions of silicon nanowire field effect transistor (SiNW FET). By examining charged polymer reaction in the silicon nanowire transistor (SiNW), we have discovered that the threshold voltage (V-T) shift and change of subthreshold slope (SS) in wet environment are smaller than that of the air. Furthermore, we analyzed the sensitivity through modifying electrolyte concentration in the wet condition, and confirmed that V-T shift increases in low concentration condition of phosphate buffered saline (PBS) due to the Debye length. We believe that the results we have found in this study would be the cornerstone in contributing to advanced biosensing experiment in the future.</P>
Cloning of the Xylose Reductase Gene of Candida milleri
( Hyoun Soo Sim ),( Eun Hee Park ),( Se Young Kwon ),( Sang Ki Choi ),( Su Han Lee ),( Myoung Dong Kim ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.7
B. amyloliquefaciens CB1 secretes proteases with fibrinolytic activities. A gene homologous to
Strain Sensing Characteristics of Rubbery Carbon Nanotube Composite for Flexible Sensors
Choi, Gyong Rak,Park, Hyung-Ki,Huh, Hoon,Kim, Young-Ju,Ham, Heon,Kim, Hyoun Woo,Lim, Kwon Taek,Kim, Sung Yong,Kang, Inpil American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.2
<P>In this study, the piezoresistive properties of CNT (Carbon Nanotube)/EPDM composite are characterized for the applications of a flexible sensor. The CNT/EPDM composites were prepared by using a Brabender mixer with MWCNT (Multi-walled Carbon Nanotube) and organo-clay. The static and quasi-dynamic voltage output responses of the composite sensor were also experimentally studied and were compared with those of a conventional foil strain gage. The voltage output by using a signal processing system was fairly stable and it shows somehow linear responses at both of loading and unloading cases with hysteresis. The voltage output was distorted under a quasi-dynamic test due to its unsymmetrical piezoresistive characteristics. The CNT/EPDM sensor showed quite tardy response to its settling time test under static deflections and that would be a hurdle for its real time applications. Furthermore, since the CNT/EPDM sensor does not have directional voltage output to tension and compression, it only could be utilized as a mono-directional force sensor such as a compressive touch sensor.</P>
Effect of Patellar Taping on Quadriceps Muscle of Knee Joint
Sung Eun Lee,Shin Gyun Kim,Sung Hyoun Cho,Yoo Rim Choi,Chang Sook Kim,Sung Joon Kim,Ki San Nam,Gyung Kim 국제물리치료학회 2012 Journal of International Academy of Physical Ther Vol.3 No.1
This study aims to examine the effect of patellar taping common to patients with patellofemoral pain syndrome on the change of knee joint location. The total number of participants is 12 patients with no pain in their knee. There are three different experiments: no-taping, placebo taping, and patellar taping. After application, they squat on their hams. As a result, both the muscle activity of vastus medialis and that of vastus lateralis increased in placebo taping compared to no-taping, which wasn't statistically significant. However, the muscle activity of vastus medialis and that of vastus lateralis decreased in patellar taping compared to no-taping, which was statistically significant. This suggests that patellar taping causing the lateral attraction of knee joint is more influential to the dynamics of knee joint than skin afferent input in placebo taping. Therefore, patellar taping is effective to change the location of knee joint, affect the muscle activity of quadriceps muscle of thigh, and thus correct the misalignments of the knee joint.