http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Benchmarks and Reliable DFT Results for Spin Gaps of Small Ligand Fe(II) Complexes
Song, Suhwan,Kim, Min-Cheol,Sim, Eunji,Benali, Anouar,Heinonen, Olle,Burke, Kieron American Chemical Society 2018 Journal of chemical theory and computation Vol.14 No.5
<P>All-electron fixed-node diffusion Monte Carlo provides benchmark spin gaps for four Fe(II) octahedral complexes. Standard quantum chemical methods (semilocal DFT and CCSD(T)) fail badly for the energy difference between their high- and low-spin states. Density-corrected DFT is both significantly more accurate and reliable and yields a consistent prediction for the Fe-Porphyrin complex.</P> [FIG OMISSION]</BR>
황수환(Suhwan Hwang),김석환(Seokhwan Kim),이광노(Kwang-Noh Lee),편종권(Jong-Kweon Pyun),김진규(Jinkyoo Kim),송명준(Myungjoon Song),양정태(Jungtae Yang),이인혁(Inhyeok Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Many engineers are trying to predict seat comfort, but these predictions are very difficult. The automobile seat is composed of the foam with the frame. Lumbar support is very important part in car seat, also. Using data from a seat material property, pam-comfort program finds the factor that we will make a major parameter of seat comfort. On the basis of result knowledge of the analysis, we can evaluate the seat comfort factor and find the best way to solve it. Simulation program will be used to predict major parameter to seat comfort.
A Reduced-Swing Voltage-Mode Driver for Low-Power Multi-Gb/s Transmitters
Heesoo Song,Suhwan Kim,Deog-Kyoon Jeong 대한전자공학회 2009 Journal of semiconductor technology and science Vol.9 No.2
At a lower supply voltage, voltage-mode drivers draw less current than current-mode drivers. In this paper, we newly propose a voltage-mode driver with an additional current path that reduces the output voltage swing without the need for complicated additional circuitry, compared to conventional voltage-mode drivers. The prototype driver is fabriccated in a 0.13-㎛ CMOS technology and used to transmit data streams at the rate of 2.5 Gb/s. Deemphasis is also implemented for the compensation of channel attenuation. With a 1.2-V supply, it dissipates 8.0 ㎃ for a 400-㎷ output voltage swing.
스마트 폰 기반 3D 프린팅 칩을 이용한 적혈구 변형성 측정
이수환(Suhwan Lee),홍현지(Hyeonji Hong),염은섭(Eunseop Yeom),송재민(Jae Min Song) 한국가시화정보학회 2020 한국가시화정보학회지 Vol.18 No.3
RBC (red blood cell) deformability is one of factors inducing blood shear thinning effect. Reduction of RBC deformability increases blood viscosity in high shear region. In this study, 3D printed chip with proper distribution of wall shear rate (WSR) was proposed to measure RBC deformability of blood samples. To fabricate 3D printed chip, the design of 3D printed chip determined through numerical simulation was modified based on the resolution of the 3D printer. For the estimation of pressure drop in the 3D printed chip, two bypass outlets with low and high WSR are exposed to atmospheric pressure through the needles. By positioning the outlet of needles in the gravity direction, the formation of droplets at bypass outlets can be captured by smartphone. Through image processing and fast Fourier transform (FFT) analysis, the frequency of droplet formation was analyzed. Since the frequency of droplet formation is related with the pressure at bypass, high pressure drop caused by reduction of RBC deformability can be estimated by monitoring the formation of blood droplets using the smartphone.
Park, Junwoo,Song, Suhwan,Yang, YoungJun,Kwon, Soon-Hyung,Sim, Eunji,Kim, Youn Sang American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.32
<P>Recently, various energy transducers driven by the relative motion of solids and liquids have been demonstrated. However, in relation to the energy transducer, a proper understanding of the dynamic behavior of ions remains unclear. Moreover, the energy density is low for practical usage mainly due to structural limitations, a lack of material development stemming from the currently poor understanding of the mechanisms, and the intermittently generated electricity given the characteristics of the water motion (pulsed signals). Here, we verify a hypothesis pertaining to the ion dynamics which govern the operation mechanism of the transducer. In addition, we demonstrate enhanced energy transducer to convert the mechanical energy of flowing water droplets into continuous electrical energy using an electrolyte insulator semiconductor structure as a device structure. The output power per droplet mass and the ratio of generated electric energy to the kinetic energy of water drops are 0.149 nu(2) mW.g(-1).m(-2).s(2) and 29.8%, respectively, where nu is the speed of the water droplet.</P>
Soft‐wall ion transfer channel accurately predicts sterically hindered ion channel permeability
Kim Youngsam,Song Suhwan,Kim Min‐Cheol,Sim Eunji 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.4
We provide a simple and systematic computational model to study ion channel permeability using density functional theory. While existing permeability models with a hard-wall steric hindrance factor work reasonably well for large ions, they severely inhibit the permeation of small ions through channel pores. Here, by introducing a steric hindrance factor that allows pore expansion due to intrinsically soft ion transfer channel walls, the new permeability model accurately describes the effect of steric hindrance stemming from the soft and flexible ion channel wall. Most importantly, the soft-wall ion transfer channel model works for a wide range of ionic radii from fluoride to gluconate. In addition, we show that strong local electrostatic interaction between densely charged ions such as fluoride and bicarbonate and ion channels with ion binding sites significantly promotes the permeation processes.
A 0.3–1.4 GHz All-Digital Fractional-N PLL With Adaptive Loop Gain Controller
Deok-Soo Kim,Heesoo Song,Taeho Kim,Suhwan Kim,Deog-Kyoon Jeong IEEE 2010 IEEE journal of solid-state circuits Vol.45 No.11
<P>A 0.3-1.4 GHz all-digital phase locked loop (ADPLL) with an adaptive loop gain controller (ALGC), a 1/8-resolution fractional divider and a frequency search block is presented. The ALGC reduces the nonlinearity of the bang-bang phase-frequency detector (BBPFD), reducing output jitter. The fractional divider partially compensates for the large input phase error caused by fractional-N frequency synthesis. A fast frequency search unit using the false position method achieves frequency lock in 6 iterations that correspond to 192 reference clock cycles. A prototype ADPLL using a BBPFD with a dead-zone-free retimer, an ALGC, a fractional divider, and a digital logic implementation of a frequency search algorithm was fabricated in a 0.13-μm CMOS logic process. The core occupies 0.2 mm<SUP>2</SUP> and consumes 16.5 mW with a 1.2-V supply at 1.35-GHz. Measured RMS and peak-to-peak jitter with activating the ALGC are 3.7 ps and 32 ps respectively.</P>
Quantitative structural characterization of phosphatidylinositol phosphates from biological samples
Kim, Su Hee,Song, Ha Eun,Kim, Su Jung,Woo, Dong Cheol,Chang, Suhwan,Choi, Woo Gyun,Kim, Mi Jeong,Back, Sung Hoon,Yoo, Hyun Ju American Society for Biochemistry and Molecular Bi 2017 Journal of lipid research Vol.58 No.2
<P>The aspects of cellular metabolism controlled by phosphatidylinositol phosphates (PtdInsPs) have been broadly expanded, and these phospholipids have drawn tremendous attention as pleiotropic signaling molecules. PtdInsPs analysis using LC/MS/MS has remained challenging due to the strong hydrophilicity of these lipids. Multiple reaction monitoring (MRM) or a neutral loss scan has been performed to quantitatively measure PtdInsPs after chemical derivatization on the phosphate groups of inositol moieties. Only predefined PtdInsPs can be measured in MRM mode, and fatty acyl compositions of sn-1 and sn-2 positions of PtdInsPs cannot be obtained from a neutral loss scan. In our present study, we developed a simple LC/MS/MS method for structural identification of sn-1 and sn-2 fatty acids of PtdInsPs and their relative quantitation. Precursor ion scans of sn-1 monoacylglycerols (MAGs) of PtdInsPs provided structural information about the lipids, and ammonium adduction enhanced signal intensities of PtdInsPs. The relative amount of observed PtdInsPs in biological samples could be compared using chromatographic peak areas from the neutral loss scans. Using precursor ion scans of sn-1 MAG and neutral loss scans of headgroups, major PtdInsPs in cells and tissues were successfully identified with structural information of sn-1 and sn-2 fatty acids, and their relative amounts in different samples were compared.</P>