• Proceedings of the Korean Society of Toxicology Conference
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• 2003.10b
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• pp.119-119
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• 2003

The objective of this study was to determine genotoxic potential of Sophora Japonica Linne Seed Extract(SE). The bacterial reverse mutation test set the treatment levels of SE at 0, 312.5, 625, 1250, 2500, 5000 $\mu\textrm{g}$/plate using Salmonella typhimurium strains (TA1535, TA1537, TA98, TA100) and Escherichia coli WP2uvrA(pKM101). (omitted)

• Bulletin of the Korean Chemical Society
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• v.17 no.12
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• pp.1123-1127
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• 1996

Crystalline compound RbV2SeO7, a Rb analogue of KV2SeO7, was synthesized from a hydrothermal reaction of V2O5, V2O3, SeO2, and Rb2CO3 in the mole ratio 3: 1: 15: 6 (in millimoles) at 230℃. RbV2SeO7 crystallizes in an orthorhombic space group Pnma (No. 62) with a=18.444(8), b=5.415(3), c=7.070(4) Å, Z=8. The two structures of KV2SeO7 and RbV2SeO7 are almost the same except that bond lengths in the latter are slightly longer than in the former. The magnetic susceptibility measurement for RbV2SeO7 in the temperature range 4-300 K showed an antiferromagnetic ordering with TN=45 K, higher than that for KV2SeO7 of 27 K. The origin of the magnetic coupling and the different ordering temperatures in the two phases are discussed in relation to the crystal structures.

• The Bulletin of The Korean Astronomical Society
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• v.39 no.2
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• pp.61.1-61.1
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• 2014

IC 10 is one of the most well-known irregular starburst dwarf galaxies in the Local Group. Its low metal and oxygen abundance together with proximity make it an excellent laboratory to test star formation models, especially in low-metallicity systems like galaxies in the early Universe as well as many other local dwarfs. Among a number of active star forming regions, we have detected H2O kilo-maser emission in the south-east region of IC 10(IC 10 SE) using the Korean VLBI Network(KVN). This maser line is likely to be associated with a giant molecular cloud identified in IC 10 SE by former CO studies. Using the HI and CO data from the VLA and SMA archive, we probe the atomic and molecular gas properties of IC 10 SE. We discuss how the cool gas morphology and kinematics are related with maser and star formation activity in IC 10 SE.

• Proceedings of the Materials Research Society of Korea Conference
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• 2007.11a
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• pp.58.1-58.1
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• 2007

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.23 no.11
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• pp.911-914
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• 2010

In this paper, the $CuInSe_2$ thin film was prepared by using co-evaporation method in four different substrate temperatures $100^{\circ}C$, $200^{\circ}C$, $300^{\circ}C$ and $400^{\circ}C$. When the substrate temperature was at $200^{\circ}C$ and $300^{\circ}C$, the single-phase $CuInSe_2$ was crystallized. As the temperature increased, it was shown that the thickness of the thin film was decreased with increment of the hall coefficient. When the sample was prepared at $200^{\circ}C$ of the subsrate temperature, the values of band gap energy (Eg), sheet resister and resistivity were measured 0.99 eV, $89.82\;{\Omega}/{\square}$ and $103{\times}10^{-4}\;{\Omega}{\cdot}cm$, respectively.

• Carbon letters
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• v.9 no.4
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• pp.298-302
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• 2008

Carbon blacks could be used as the filler for the electromagnetic interference (EMI) shielding. The poly vinyl alcohol (PVA) and polyvinylidene fluoride (PVDF) were used as the matrix for the carbon black fillers. Porous carbon blacks were prepared by $CO_2$ activation. The activation was performed by treating the carbon blacks in $CO_2$ to different degrees of burnoff. During the activation, the enlargement of pore diameters, and development of microporous and mesoporous structures were introduced in the carbon blacks, resulting in an increase of extremely large specific surface areas. The porosity of carbon blacks was an increasing function of the degree of burn-off. The surface area increased from $80\;m^2/g$ to $1142\;m^2/g$ and the total pore volume increased from $0.14073\;cc{\cdot}g^{-1}$ to $0.9343\;cc{\cdot}g^{-1}$. Also, the C=O functional group characterized by aldehydes, ketones, carboxylic acids and esters was enhanced during the activation process. The EMI shielding effectiveness (SE) of raw N330 carbon blacks filled with PVA was about 1 dB and those of the activated carbon blacks increased to the values between 6 and 9 dB. The EMI SE of raw N330 carbon blacks filled with PVDF was about 7 dB and the EMI SE increased to the range from 11 to 15 dB by the activation.

• Journal of the Korean Society of Systems Engineering
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• v.7 no.1
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• pp.31-41
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• 2011

The purpose of this paper is to provide an abstracted meta-model for executing Capabilities Portfolio Management (CPM) effectively based on DoDAF2.0. The purpose of developing an architecture is for beneficial use of it. A good set of architectural artifacts facilitates the manipulation and use of them in meeting its usage objectives well. Systems engineering methodologies evolve to accommodate or to deal with enterprise or SoS/FoS level problems. And DoD's Capabilities Portfolio Management (CPM) is a good example which demonstrates enterprise or SoS level problems. However, the complexity of the architecture framework makes it difficult to develop and use the architecture models and their associated artifacts. DoDAF states that it was established to guide the development of architectures and to satisfy the demands of a structured, repeatable method for evaluating alternatives which add value to decisions and management practices. One of the objectives of DoDAF2.0 is to define concepts and models usable in CPM which is one of DoD's six core processes. However, DoDAF and various guidelines state requirements for CPM rather than how to. This paper provides methodology for CPM which includes process and tailored meta-models based on DoDAF Meta Model (DM2).

• Journal of the Korean Society of Systems Engineering
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• v.11 no.2
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• pp.107-113
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• 2015

체계적이고 효율적인 경량전철시스템 건설 및 운영을 위해 시스템엔지니어링(SE) 기술의 적용은 필수적인 활동이 되었다. 이에 따라 사업수행과정에서 다양한 요구사항과 위험요소를 적기에 식별하고 조치하는 시스템엔지니어링 인력의 전문성이 매우 중요하게 고려되고 있다. 이에 본 연구에서는 경량전철 시스템엔지니어링 사업과 관련된 이해관계자들(획득자 및 공급자, 그리고 협력업체 등)을 위한 SE 교육교재를 개발하여 사업수행 전 및 수행과정에서 활용할 수 있도록 하였다. 교육교재는 일반(공통)과정, 수행자(실무자)과정, 심화수행자(관리자)과정)으로 구분하여 개발하였다. 이는 경량전철사업의 성공과 우수한 성과 창출을 위해 중요한 역할을 할 것으로 기대된다.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.376-376
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• 2011

I-III-VI2 chalcopyrite compounds, particularly copper, indium, gallium selenide(Cu(InxGa1-x)Se2, CIGS), are effective light-absorbing materials in thin-film solar application. They are direct band-gap semiconductors with correspondingly high optical absorption coefficients. Also they are stable under long-term excitation. CIS (CIGS) solar cell reached conversion efficiencies as high as 19.5%. Several methods to prepare CIS (CIGS) absorber films have been reported, such as co-evaporation, sputtering, selenization, and electrodeposition. Until now, co-evaporation is the most successful technique for the preparation of CIS (CIGS) in terms of solar efficiency, but it seems difficult to scale up. CIS solar cells have been hindered by high costs associated with a fabrication process. Therefore, inorganic colloidal ink suitable for a scalable coating process could be a key step in the development of low-cost solar cells. Here, we will present the preparation of CIS photo absorption layer by a solution process using novel metal precursors. Chalcopyrite copper indium diselenide (CuInSe2) nanocrystals ranging from 5 to 20nm in diameter were synthesized by arrested precipitation in solution. For the fabrication of CIS photo absorption layer, the CuInSe2 colloidal ink was prepared by dispersing in organic solvent and used to drop-casting on molybdenum substrate. We have characterized the nanoparticless and CIS layer by XRD, SEM, TEM, and ICP.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.07a
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• pp.383-386
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• 2002

Polycrystalline Cu(In,Ga)Se$_2$(CIGS) thin-films were grown by co-evaporation on a soda lime glass substrate. In this paper the effects of the Se evaporation temperature on the properties of CuIn0.75Ga0.25Se2 (CIGS) thin films. Structure, surface morphology and optical properties of CIGS thin films deposited at various Se evaporation temperatures have been investigated using a number of analysis techniques. X-ray diffraction (XRD) analysis shows that CIGS films exhibit a strong <112> preferred orientation. As expected, at higher Se evaporation temperatures the films displayed a lower degree of crystallinity. The <112> peak was also enhanced and other CIGS peaks appeared simultaneously. These results were supported by experimental work using scanning electron microscopy When the Se evaporation temperature was increased, the average grain size also decreased together with a reduction Cu content. The Se evaporation temperature also had a significant inf1uence on the transmission spectra. Increasing the Se evaporation temperature, the cell efficiency was improved dramatically to 11.75% with Voc = 556 mV, Jsc = 32.17 mA/cm2 and FF = 0.66. The Se evaporation temperature is an important parameter in thin film deposition regardless of the deposition technique being used to deposit thin films