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Synthesis of Graphene Layers Using Graphite Dispersion in Aqueous Surfactant Solutions
심유민,박준,김유진,성맹제,홍승훈 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.41
Graphene layers were synthesized using ultrasonic dispersion of graphite flakes followed by ultracentrifugation in sodium cholate and polyoxyethylene nonylphenyl ether aqueous solutions. The synthesized graphene layers were characterized using Raman spectroscopy and atomic force microscopy (AFM). Typical G-band and 2D-band Raman signatures of graphene at ∼1590 cm^(−1) and ∼2695 cm^(−1), respectively, were observed in the Raman spectra of the synthesized graphene samples. The AFM height profiles of the synthesized graphene samples on SiO_2 substrates show features that can be attributed to graphenes of a single layer or a few layers.
Functionalization of Graphene with Single-stranded DNA
심유민,성맹제 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.12
We have synthesized functionalized graphene by using direct dispersion of graphite flakes with single-stranded DNA in distilled water. The synthesized graphene-DNA complexes were investigated by using Raman spectroscopy, atomic force microscopy (AFM), transmission electron microscopy (TEM), and time-of-flight secondary-ion mass spectroscopy (TOF-SIMS). Raman spectra exhibited typical G-band and 2D-band signatures of graphene at 1590 cm−1 and 2700 cm−1, respectively. TOF-SIMS result showed that the graphene layers were successfully functionalized with singlestranded DNA. Mono-layer and few-layer graphene were identified by measuring the layer thickness by using AFM and by analyzing the electron diffraction patterns from TEM measurements.
박유민 ( Yoo Min Park ),최인주 ( In Zoo Choi ),심재준 ( Jae-jun Shim ),김병호 ( Byung-ho Kim ) 대한간암학회 2018 대한간암학회지 Vol.18 No.2
As the mean life expectancy increases, the incidence of hepatocellular carcinoma (HCC) in superelderly patients (>85 years old) is expected to increase in Korea. However, their clinical features, treatments, and treatment outcomes are unclear. Herein, we present a case of a large single HCC and its natural course in an 86-year-old man who refused any treatment following histologic diagnosis. (J Liver Cancer 2018;18:146-150)
황유민,정준희,심이삭,김태우,김진영 한국위성정보통신학회 2016 한국위성정보통신학회논문지 Vol.11 No.4
본 논문에서는 실내 임펄시브 노이즈 채널 환경에서 비콘 기반의 측위 시스템의 측위 정밀도를 향상시킬 수 있는 전처리 기법을 제안하였다. 임펄시브 노이즈는 복잡한 실내 구조 환경이나 간섭 환경에서 발생하며 이는 무선 통신에서 신호 복조 오류 확률을 증가시켜 정확한 데이터 복조를 어렵게 한다. 제안한 전처리 기법은 사용자의 위치 좌표를 산출하기 위한 비콘 기반의 삼각측량법을 수행하기 이전에 적용 및 수행되며, 제안 기법을 데이터 복소의 오류 확률을 감소시켜 정확한 데이터를 삼각측량법의 입력값으로 제공한다. 신뢰성 있는 데이터 입력을 통해 위치 좌표 결과값의 신뢰도를 향상시키는 매커니즘이다. 따라서 임펄시브 노이즈 완화를 위해 신호의 시간-주파수 분해능이 우수한 웨이블릿 잡음 제어 방법을 기반으로 임펄시브 노이즈에 특성에 따라 노이즈를 제거하는 적응적 임계 함수를 제안하였다. 컴퓨터 시뮬레이션을 통해 제안한 적응적 임계 함수가 기존의 기법과 대비로 비교적 Bit Error Rate 성능 및 Signal-to-Noise Ratio 성능을 향상시키는 결과를 확인하였다. In this paper, we propose a pre-processing scheme for improving indoor positioning accuracy in impulsive noise channel environments. The impulsive noise can be generated by multi-path fading effects by complicated indoor structures or interference environments, which causes an increase in demodulation error probability. The proposed pre-processing scheme is performed before a triangulation method to calculate user’s position, and providing reliable input data demodulated from a received signal to the triangulation method. Therefore, we studied and proposed an adaptive threshold function for mitigation of the impulsive noise based on wavelet denoising. Through results of computer simulations for the proposed scheme, we confirmed that Bit Error Rate and Signal-to-Noise Ratio performance is improved compared to conventional schemes.