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Electrical Modulation of Graphene by the Self-Assembly of DNA-Functionalized Gold Nanoparticles
Kim, Tae Geun,Park, Nokyoung,Kim, Un Jeong,Hur, Jaehyun American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.11
<P>We report on a new approach for controlling the electrical properties of graphene by the introduction of a highly ordered array of DNA-grafted gold nanoparticles. The arrangement of these nanoparticles was highly influenced by the surface wetting properties of graphene. With different graphene UV-irradiation times, the ordered domain size of nanoparticles increased, which, in turn, affected the electrical properties of graphene. Upon measuring the electrical properties using graphene field effect transistors, the ambipolar characteristics of graphene (Dirac point voltage of similar to 20 V) only appeared when a large area of graphene was covered by the monolayer of hexagonal, close-packed gold nanoparticles, resulting in the n-doping of graphene. It is conceivable that a new way of modulating graphene properties can provide beneficial information and can be used for relevant future applications.</P>
Extremely small multimode-interference coupled triangular resonator with sharp angle of incidence
Kim, Doo Gun,Oh, Geum-Yoon,Choi, Woon-Kyung,Kim, Hyo Jin,Kim, Seon Hoon,Ki, Hyun Chul,Kim, Sang-Taek,Ko, Hang Ju,Kim, Tae Un,Yang, Myoung Hak,Kim, Hwe Jong,Yi, Jong Chang,Chung, Youngchul,Dagli, Nadir The Optical Society 2008 Optics express Vol.16 No.25
<P>Novel triangular ring resonators combining extremely small multimode-interference (MMI) coupler, low loss total internal reflection (TIR) mirrors, and semiconductor optical amplifiers are reported for the first time. The MMI length of 90 microm is among the shortest reported. The incidence angle of the TIR mirror inside the resonator is 22 degrees. A free-spectral range of approximately 2 nm is observed near 1550 nm along with an on-off ratio of 17 dB. The triangular resonators with a sharp angle are very attractive components due to their promise of compact size and high levels of integration. Therefore, large numbers of resonators can be integrated on a chip to increase functionality in future optical wavelength division multiplexing system.</P>
Barrier Height at the Graphene and Carbon Nanotube Junction
Tae Geun Kim,Un Jeong Kim,Si Young Lee,Young Hee Lee,Yun Seop Yu,Sung Woo Hwang,Sangsig Kim Institute of Electrical and Electronics Engineers 2014 IEEE transactions on electron devices Vol. No.
<P>Graphene/carbon nanotube (CNT) junction barrier height was investigated using all-carbon field-effect transistor structure with graphene and single-walled CNT (SWCNT) network as source (S)/drain (D)/gate electrodes and as channel, respectively. SWCNT network channel was formed by dielectricphoresis process at the prepatterned graphene S/D electrodes. By analyzing the measured current-voltage characteristics by the diode circuit model, the Schottky barrier height at the graphene and CNT junction was found to be approximately 0.5 eV.</P>
Design of DC-DC Boost Converter with RF Noise Immunity for OLED Displays
Kim, Tae-Un,Kim, Hak-Yun,Baek, Donkyu,Choi, Ho-Yong The Institute of Semiconductor Engineers 2022 Journal of semiconductor engineering Vol.3 No.1
In this paper, we design a DC-DC boost converter with RF noise immunity to supply a stable positive output voltage for OLED displays. For RF noise immunity, an input voltage variation reduction circuit (IVVRC) is adopted to ensure display quality by reducing the undershoot and overshoot of output voltage. The boost converter for a positive voltage Vpos operates in the SPWM-PWM dual mode and has a dead-time controller using a dead-time detector, resulting in increased power efficiency. A chip was fabricated using a 0.18 um BCDMOS process. Measurement results show that power efficiency is 30% ~ 76% for load current range from 1 mA to 100 mA. The boost converter with the IVVRC has an overshoot of 6 mV and undershoot of 4 mV compared to a boost converter without that circuit with 18 mV and 20 mV, respectively.
Cytotoxic Components from the Dried Rhizomes of Zingiber officinale Roscoe
Kim, Ju-Sin,Lee, Sa-Im,Park, Hye-Won,Yang, Jae-Heon,Shin, Tae-Yong,Kim, Youn-Chul,Baek, Nam-In,Kim, Sung-Hoon,Choi, Sang-Un,Kwon, Byoung-Mog,Leem, Kang-Hyun,Jung, Mun-Yhung,Kim, Dae-Keun 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.4
Five compounds were isolated from the chloroform-soluble fraction of the methanolic extract of the dried rhizomes of Zingiber officinale (Zingiberaceae) through repeated column chromatography. Their chemical structures were elucidated as 4-, 6-, 8-, and 10-gingerols, and 6-shogaol using spectroscopic analysis. Among the five isolated compounds, 6-shogaol exhibited the most potent cytotoxicity against human A549, SK-OV-3, SK-MEL-2, and HCT15 tumor cells. 6-shogaol inhibited proliferation of the transgenic mouse ovarian cancer cell lines, C1 (genotype: $p53^{-/-}$, c-myc, K-ras) and C2 (genotype: $p53^{-/-}$, c-myc, Akt), with $ED_{50}$ values of 0.58 ${\mu}M$ (C1) and 10.7 ${\mu}M$ (C2).
Genetic association of MYH genes with hereditary hearing loss in Korea
Kim, Sang-Joo,Lee, Seokwon,Park, Hong-Joon,Kang, Tae-Hun,Sagong, Borum,Baek, Jeong-In,Oh, Se-Kyung,Choi, Jae Young,Lee, Kyu-Yup,Kim, Un-Kyung Elsevier 2016 Gene Vol.591 No.1
<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Myosin is a key protein involved in regulating the shape and motility of cells. The <I>MYH9</I> and <I>MYH14</I> genes, which encode non-muscle myosin heavy chain IIA (NMMHC II-A) and IIC (NMMHC II-C), respectively, are expressed in the inner ear. These myosin genes are known to be associated with autosomal dominant non-syndromic hearing loss (ADNSHL); however, genetic studies in patients with ADNSHL in Korea have rarely been reported.</P> <P><B>Methods</B></P> <P>We analyzed the <I>MYH9</I> and <I>MYH14</I> genes in 75 Korean patients with ADNSHL.</P> <P><B>Results</B></P> <P>We identified 4 possible pathogenic variants: a novel variant p.F1303L and 2 previously reported variants (p.R1730C and p.R1785C) in the <I>MYH9</I> gene, and a novel variant p.A1868T in the <I>MYH14</I> gene. All the variants were located in the myosin tail domain, which is essential for the interaction of myosin with actin. These variants were predicted to be possibly pathogenic by functional prediction tools and were absent in 100 unrelated normal controls.</P> <P><B>Conclusion</B></P> <P>These results suggest that all the variants identified in this study have a strong potential to affect the structural stability and/or function of non-muscle myosin in the inner ear, which might lead to ADNSHL. This study establishes the link between the genotype and development of ADNSHL and contributes to the establishment of Korean database for hereditary hearing loss.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We performed genetic analysis of <I>MYH</I> genes in Korean patients with ADNSHL. </LI> <LI> We found three and one possibly pathogenic variants in <I>MYH9</I> and <I>MYH14</I>, respectively. </LI> <LI> Our research will improve understanding of relations between MYH genes and ADNSHL. </LI> </UL> </P>
Dynamic Analysis and Structural Optimization of a Fiber Optic Sensor Using Neural Networks
Kim Yong-Yook,Kapania Rakesh K.,Johnson Eric R.,Palmer Matthew E.,Kwon Tae-Kyu,Hong Chul-Un,Kim Nam-Gyun The Korean Society of Mechanical Engineers 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.2
The objective of this work is to apply artificial neural networks for solving inverse problems in the structural optimization of a fiber optic pressure sensor. For the sensor under investigation to achieve a desired accuracy, the change in the distance between the tips of the two fibers due to the applied pressure should not interfere with the phase change due to the change in the density of the air between the two fibers. Therefore, accurate dynamic analysis and structural optimization of the sensor is essential to ensure the accuracy of the measurements provided by the sensor. To this end, a normal mode analysis and a transient response analysis of the sensor were performed by combining commercial finite element analysis package, MSC/NASTRAN, and MATLAB. Furthermore, a parametric study on the design of the sensor was performed to minimize the size of the sensor while fulfilling a number of constraints. In performing the parametric study, the need for a relationship between the design parameters and the response of the sensor was fulfilled by using a neural network. The whole process of the dynamic analysis using commercial finite element analysis package and the parameter optimization of the sensor were automated within the MATLAB environment.
Foreign Objects in Korean Prisoners
( Tae Hee Lee ),( Young Woo Kang ),( Hyun Jin Kim ),( Sun Moon Kim ),( Euyi Heog Im ),( Kyu Chan Huh ),( Young Woo Choi ),( Tae Hyo Kim ),( Ok Jae Lee ),( Un Tae Jung ) 대한내과학회 2007 The Korean Journal of Internal Medicine Vol.22 No.4
Background: Foreign objects in the gastrointestinal tract are usually the result of accidental swallowing. Yet foreign object ingestion is often seen in prisoners who mainly desire to leave prison. We report here on a series of 33 Korean prisoners with foreign object ingestion and they were treated endoscopically or surgically. Methods: We reviewed the medical records of 33 Korean prisoners (52 episodes) who were admitted due to ingestion of foreign objects between January 1998 and June 2004 to Konyang University Hospital and Gyeongsang National University Hospital. Results: All the patients were male with a mean age of 35 years. The most common duration from ingestion to the visit to the ER was within 24 hours (25/52 episodes). Most of the foreign objects were located in the esophagus (42.3%) and stomach (42.3%). The number of foreign objects was one in 28 episodes, two in 12 episodes and three or more in twelve episodes. The most common foreign objects were metal wires (26/52 episodes). The mean size of the foreign objects was 11.9 centimeters long. Successful endoscopic treatment was performed in most patients (46/52 episodes, 88.5%). The remaining six cases were treated surgically. Conclusions: The foreign objects in prisoners were a variety of unusual things because of the prison environment, and endoscopy is a mainstay of treatment for foreign object removal in Korean prisoners.