http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
송유빈 ( You Bin Song ),이경석 ( Kyung Seok Lee ),이명숙 ( Myoung Sook Lee ),김애정 ( Ae Jung Kim ) 한국식품영양학회 2013 韓國食品營養學會誌 Vol.26 No.3
This study was investigated the optimal time that enhanced the functional activities of mung beans for use of functional food resources. Mung beans were roasted according three levels of roasting time levels (10, 20 and 30 minutes) at 110℃ and then the physicochemical compositions were determined. The reducing sugar content was decreased with the increased roasting time. Moisture was decreased with increased roasting time, whereas, crude fat, crude ash, crude protein and carbohydrate were increased with prolonged roasting time. The highest contents of total phenol and flavonoid were shown at a roasting condition 110℃ for 30 minutes. The highest inhibitory activities of DPPH radical, ABTS radical and xanthine oxidase was the best at the condition of 110℃ for 30 min. From these results optimal roasting time of mung beans were 30 minutes for use of functional food resources.
원자 궤도 함수 선형 결합과 평면파로 예측된 Au 나노 결정의 비교
김보성,송유빈,박지상 한국물리학회 2022 새물리 Vol.72 No.8
We explored the configuration space of Au nanocrystals by using point group symmetry. For Au nanocrystals whose size is equal to or less than six atoms, linear combination of atomic orbitals (LCAO) was used to relax the structure and compare with plane-wave calculations. In general, the predicted shape and stability of nanocrystals were consistent, but the optimized bond lengths were longer in LCAO calculations. Similar to nanocrystals, the optimized lattice constant of the face-centered cubic Au was smaller in the plane-wave calculation. The structure and stability of Ag nanocrystals were also investigated using both methods. 우리는 대칭 점군을 활용하여 Au 나노결정이 가질 수 있는 짜임새 공간(configuration space)을 탐색하였다. 원자 궤도 함수 선형 결합(LCAO) 계산을 수행하여 원자 개수가 6개 이하의 Au 나노결정이 선호하는 구조를 얻을 수 있었고, 평면파 계산과 비교하였다. 예측된 나노결정의 모양 및 안정성은 대체로 일치하였으나, LCAO 계산에서 다소 결합 길이가 길게 계산되는 경향이 나타났다. 면심입방구조 Au의 결정에서도 마찬가지로 평면파 계산에서 더 작은 격자 상수가 얻어졌다. Ag 나노 결정의 구조와 안정성도 두 가지 방법을 사용하여 조사되었다.
Si1-xGex, AlxGa1-xN의 원자 구조 및 전자 구조에 대한 제일원리 밀도 범함수 이론 계산
김정준,송유빈,박지상 한국물리학회 2022 새물리 Vol.72 No.7
To investigate the atomic and electronic structures of Si1-xGex and AlxGa1-xN, special quasi-random structures were generated. Before structure optimization, the positions of the constituting atoms were altered to reproduce the bond lengths in Si, Ge, AlN, and GaN as close as possible. The total energy of the optimized structure through the first-principles density functional theory calculation was only 0.03 eV per atom smaller than that of the structure optimization. The lattice constants generally increased as the proportion of Ge or Ga increased. The bond length tended to maintain its value before the mixing of materials, so the change in bond length was smaller than the change in the lattice constants. The band gap of AlxGa1-xN generally increased with the proportion of Al. In the hybrid density functional theory calculation, the band gap increased as the fraction of Hartree-Fock exchange in the functional increased. Si1-xGex 및 AlxGa1-xN의 원자 구조 및 전자 구조를 연구하기 위해 특수 준무작위 구조를 제작하였다. 구조를 최적화하기 전에 결합 길이가 Si, Ge, AlN, GaN에서의 결합 길이와 최대한 가깝도록 원자들의 위치를 수정하였다. 제일원리 밀도범함수 이론 계산을 통해 최적화된 원자 구조의 총에너지는 최적화 이전의 에너지와 원자 하나 당 0.03 eV 이하밖에 차이나지 않았다. 격자상수는 Ge과 Ga 비율이 증가할수록 커지는 경향을 보였다. 결합 길이는 혼합 전의 값을 유지하는 경향이 있어 격자상수의 변화보다 변화의 정도가 작았다. AlxGa1-xN의 띠틈은 Al 비율이 증가할수록 커지는 경향을 보였다. 혼성 밀도 범함수 이론 계산에서는 Hartree-Fock 비율이 증가함에 따라 띠틈이 증가하였다.
Sadia Ameen,신형식,송민우,김돈규,임유빈,서형기,김영순 한국고분자학회 2012 Macromolecular Research Vol.20 No.1
The deposition of undoped and iodine (I2)-doped polyaniline (PANI) on TiO2 thin film was carried out using plasma-enhanced chemical vapor deposition (PECVD) under different power inputs for the fabrication of p-polyaniline/n-TiO2 heterostructure devices. The increment in the size of TiO2 nanoparticles was observed after I2doping by PECVD. The crystalline properties were altered upon I2 doping, suggesting a subtractive interaction between PANI and I2 moieties during PECVD. The significant changes in the structural and optical properties confirmed the I2 doping of PANI with strong bonding to the TiO2 nanomaterials. The existence of hydrogen bonding between the imine (-NH) of PANI and the hydroxyl (-OH) group of TiO2 nanomaterials was investigated by X-ray photoelectron spectroscopy characterization. A device fabricated by PANI/TiO2 or I2-PANI/TiO2 thin film with a top platinum (Pt) layer exhibited nonlinear behavior of current (I)-voltage (V) curve, i.e., moderate diode behavior. Compared to the Pt/PANI/TiO2 heterostructure device, the Pt/I2-PANI/TiO2 heterostructure device showed improved I-V properties with a considerably higher current of 0.050 mA, which might be attributed to the I2 doping-induced generation of large numbers of polarons in the PANI bandgap.
SnO₂ 결정과 결정립계에 대한 제일원리 밀도 범함수 이론 계산
이석(Seok Lee),송유빈(Youbin Song),박지상(Ji-Sang Park) 한국물리학회 2022 새물리 Vol.72 No.5
SnO₂는 할로겐화물 페로브스카이트를 비롯한 여러 물질에서 전자 수송층으로 쓰이는 물질로 최근 많은 관심을 받고 있다. 본 연구에서는 SnO₂의 원자구조와 전자구조를 여러 교환-상관 퍼텐셜과 판데르발스 보정을 이용하여 연구하였다. 또한 전자구조를 보다 정확하게 계산하기 위해 혼성 밀도범함수 이론을 이용하여 비자체일관장 및 자체일관장 계산을 수행하였다. 일반적으로 격자 상수가 작을수록 띠틈은 크게 계산되는 경향성이 발견되었다. SnO₂에서 생성될 수 있는 [120] 결정립계의 안정성도 계산하였으며, 산소의 화학퍼텐셜에 따라서 다른 구조가 안정화될 수 있었다. SnO₂ has attracted much attention as an electron transport layer in semiconductor devices such as halide perovskite solar cells. In this study, the atomic and electronic structures of SnO₂ were investigated using various exchange-correlation functionals and van der Waals corrections. We also performed both non-self-consistent and self-consistent field calculations using hybrid density functional theory to improve the electronic structure. When six calculation methods were compared, the smaller the lattice constants, the larger the band gap value obtained. The stability of the [120] grain boundary in SnO₂ was also investigated, and different structures could be stabilized depending on the chemical potential of oxygen.