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Sub Bandgap Photonic Base Current Method for Characterization of
H. T. Shin,K. H. Kim,D. J. Kim,D. M. Kim,D. W. Kang,H. S. Park,H. T. Kim,I. C. Nam,J. B. Choi,J. U. Lee,K. S. Min,K. S. Kim,S. W. Kim,T. E. Kim 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.6
In this paper, we propose a novel photonic base current analysis method to characterize the interface states in heterojunction bipolar transistors (HBTs) by using the photonic I-V characteristics under sub-bandgap photonic excitation. For the photonic current-voltage characterization of HBTs, an optical source with a photon energy less than the bandgap energy of Al0:3Ga0:7As and GaAs (Eph = 0.95 eV < Eg;AlGaAs = 1.79 eV & Eg;GaAs = 1.45 eV) is employed for the characterization of the interface states distributed in the photo-responsive energy band (EC - 0.95 Eit EC) in emitter-base heterojunction at HBTs. The proposed novel method, which is applied to bipolar junction transistors for the rst time, is simple, and an accurate analysis of interface traps in HBTs is possible. By using the photonic base-current and the dark-base-current, we qualitatively analyze the interface trap at the Al0:3Ga0:7As/GaAs heterojunction interface in HBTs.
Hadmojo, W.,Nam, S.,Shin, T.,Yoon, S.,Jang, S. Y.,Jung, I. Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.31
<P>Organic small molecule (SM) acceptors containing a perylene diimide (PDI) moiety, F2B-T2PDI and T2PDI are synthesized, and the effects of their molecular geometry on the performance of fullerene-free organic photovoltaic (OPV) devices are investigated. The SM acceptors possess a PDI-core-PDI structure in which the PDI wing is connected to conjugated core units. By incorporation of a 2,5-difluorobenzene (F2B) moiety within the core unit, the planarity of the conjugated core is enhanced and the energy levels of the SM acceptor are down-shifted. In terms of molecular geometry, the F2B-containing SM acceptor, F2B-T2PDI, has a rigid core, which can symmetrically align the two PDI wings and enhance molecular packing. As a result, improved electron transport and bulk heterojunction morphology of the active layers are achieved. Furthermore, the incorporation of the F2B moiety effectively down-shifts the HOMO energy level, preventing back-transfer of holes from the acceptor to the cathode and enhancing the absorption of complementary wavelengths of the donor polymer, PTB7-Th. Leveraged by the beneficial geometric and energetic effects from the incorporation of F2B units, the power conversion efficiency of fullerene-free OPV devices using F2B-T2PDI reached 5%, whereas that using T2PDI was 3.63%.</P>
Kim, Y-R,Kim, I-J,Kang, T W,Choi, C,Kim, K K,Kim, M S,Nam, K I,Jung, C Macmillan Publishers Limited 2014 Oncogene Vol.33 No.37
Characteristically, prostate cancer (PCa) cells exhibit marked decrease in intracellular zinc; however, the mechanism responsible is not clearly understood. HOXB13 is involved in PCa progression and is overexpressed in castration-resistant PCa. DNA microarray analysis of LNCaP Pca cells showed that ZnT zinc output transporters were strikingly upregulated among androgen-independent HOXB13 target genes. Furthermore, exogenous HOXB13 caused intracellular zinc concentrations to fall in PCa cells, stimulated NF-κB-mediated signaling by reducing inhibitor of NF-κB alpha (IκBα) and enhanced the nuclear translocation of RelA/p65. Human prostate tumors also exhibited strong inverse correlation between the protein expressions of HOXB13 and IκBα. Consequently, HOXB13 stimulated PCa cell invasion, and this was inhibited by the suppression of ZnT4. In addition, studies in a PC3 orthotopic mouse model of PCa metastasis showed that HOXB13 is a strong metastatic stimulator. Taken together, these results show that HOXB13 promotes PCa invasion and metastasis by decreasing intracellular zinc levels, thus stimulating NF-κB signals, and suggest that HOXB13 acts as a modulator of intracellular zinc levels that promotes the malignant characteristics of PCa.
수소를 포함하고 있는 3원계 합금에 있어서 Enthalpy 및 Entropy Interaction Parameter 의 물리화학적의의에 관한 고찰
이재영,이병택,남인탁,김대룡 대한금속재료학회(대한금속학회) 1980 대한금속·재료학회지 Vol.18 No.5
이미 보고되어 있는 Mo 및 그 합금에서의 수소의 용해도 data로부터 900-1500°K의 온도범위에서 각 합금원소들의 free energy, enthalpy 및 entropy interaction parameter들을 구하였다. 지금까지 논의되어온 수소의 움직임에 미치는 합금원소의 영향을 크게 전자구조와 strain의 두가지로 나누어 간단히 논하고 그 각각이 enthalpy 및 entropy interaction parameter에 지배적으로 기여함을 보였다. 이는 측정되지 않은 다른 system에서의 수소의 움직임을 아는데 도움이 되며 예로서 Nb-Ta계에 적용되어 설명되었다. With the published data of solubility of hydrogen in Mo and Mo-base alloys, the free energy interaction parameters(ε) of each alloying elements are calculated. These data cover the temperature range from 900 to 1500°K and from the ε vs 1/T (temperature) plot, enthalpy and entropy interaction parameters of each alloying elements are calculated. The two major parts of the effect of alloying elements on the solubility of hydrogen, i.e. the effect of the electronic structure and that of the strain are discussed briefly. And finding is that the former contributes dominantly to the enthalpy interaction parameter and the latter to the entropy interaction parameter. Applying the above findings to the Nb-Ta system, the argument is justified more clearly.
14.6, 60 및 200 A GeV 원자핵-원자핵 중심 충돌 核반응 연구
박인곤,송진섭,남상탁,윤천실 慶尙大學校 기초과학연구소 1989 基礎科學硏究所報 Vol.5 No.-
The results of a study of central collisions of ^16O nuclei with the heavy elements of nuclear emulsion(^107Ag, ^80Br) at 14.6, 60 and 200 GeV/n are compared with proton-emulsion data at equivalent energy. The multiplicity of produced charged secondaries for the ^16O interactions increases with energy faster than for proton projectiles, but the ratio of the mean meson multiplicity to the number of wounded nucleon is reasonably consistent with the prediction of superposition models. At 200 GeV/n, the central particle pseudorapidity density is found to be 66±2 for events with multiplicities exceeding 200.
윤진일,남재철,홍석영,김준,김광수,정유란,채남이,최태진 한국농림기상학회 2004 한국농림기상학회지 Vol.6 No.3
Evapotranspiration (ET) is a critical component of the hydrologic cycle which influences economic activities as well as the natural ecosystem. While there have been numerous studies on ET estimation for homogeneous areas using point measurements of meteorological variables, monitoring of spatial ET has not been possible at landscape - or watershed - scales. We propose a site-specific application of the land surface model, which is enabled by spatially interpolated input data at the desired resolution. Gyunggi Province of South Korea was divided into a regular grid of 10 million cells with 30m spacing and hourly temperature, humidity, wind, precipitation and solar irradiance were estimated for each grid cell by spatial interpolation of synoptic weather data. Topoclimatology models were used to accommodate effects of topography in a spatial interpolation procedure, including cold air drainage on nocturnal temperature and solar irradiance on daytime temperature. Satellite remote sensing data were used to classify the vegetation type of each grid cell, and corresponding spatial attributes including soil texture, canopy structure, and phenological features were identified. All data were fed into a standalone version of SiB2(Simple Biosphere Modell) to simulate latent heat flux at each grid cell. A computer program was written for data management in the cell - based SiB2 operation such as extracting input data for SiB2 from grid matrices and recombining the output data back to the grid format. ET estimates at selected grid cells were validated against the actual measurement of latent heat fluxes by eddy covariance measurement. We applied this system to obtain the spatial ET of the study area on a continuous basis for the 2001-2003 period. The results showed a strong feasibility of using spatial - data driven land surface models for operational monitoring of regional ET.