• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2008.10a
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• pp.38-41
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• 2008

To investigate the evolution of microstructure and texture in AZ31 Mg alloy, direct/indirect extrusion process was carried out at $300^{\circ}C$ with various extrusion speeds. The distribution of grain size depends on extrusion method and extrusion speed. More homogeneous grain site can be obtained at higher extrusion speed of indirect extrusion process. Extrusion speed does not affect significantly texture evolution during extrusion process regardless of extrusion method. ODF section is more useful to understand texture evolution during extrusion process compared with pole figure.

• 한국정보교육학회:학술대회논문집
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• 2010.01a
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• pp.333-336
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• 2010

본 연구에서는 XML 기반의 Digital Format Registry를 고도화하며 국내 실정(750 여개의 기록관)에 맞는 기술정보은행 서비스 제공 모델을 연구하여 적용방안을 수립하고 이에 필요한 요소 기술을 개발하는 것이다. 특히 도 고도화 연구 개발 사업에서는 이러한 표준에 대한 지원을 최우선으로 진행되었다. 특히 업무 환경에 가장 빈번히 사용되는 국제 표준기반의 ODF(Open Document Format)와 OOXML(Office Open XML)이라는 개방형 오피스 문서 형식을 추가 지원하였으며, ISO 28500 WARC라는 웹 기록물 저장 국제 표준 형식에 대한 유효성 검증 기능을 개발 추가하여 웹 기록물에 대한 장기보존 시스템의 신뢰성을 높일 수 있도록 하였다.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 1999.03a
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• pp.149-152
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• 1999

The effect of initial orientation on the microstructure and texture evolution of two ferritic stainless steels was investigated. the columnar and equiaxed crystal specimens which were prepared from continuous casting slab were hot rolled annealed cold rolled and annealed respectively. The rolling and recrystallization textures at each process stage were examined by orientation distribution function (ODF) and electron back-scattered diffraction (EBSD); The observation showed that the orientation density of the $\alpha$-fibre of hot rolled band of columnar crystal specimen was more pronounced than that of the equaxed one at the center layer. Nevertheless the cold rolled textures of Type 430 steel have demonstrated a rather similar development . Compared to Type 430 steel the development of the $\alpha$-fibre in the center layer of Type 409L steel was much more pronounced. The relation between texture evolution and ridging behaviour has been discussed.

• Journal of the Korean Ceramic Society
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• v.43 no.3 s.286
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• pp.152-155
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• 2006

Silicon carbide ceramics seeded with 10-30 wt% SiC whiskers are fabricated by hot pressing and annealing. A quantitative texture analysis including calculation of the Orientation Distribution Function (ODF) is used for obtaining the degrees of preferred orientation of the fabricated samples. The microstructure and crystallographic texture are discussed with respect to the effect of ${\beta}-SiC$ whisker seeds on the resulting fracture toughness values. The SEM microstructures and the texture data reveal a correlation between texture and fracture toughness anisotropy.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2005.10a
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• pp.460-462
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• 2005

Asymmetrical rolling was performed with different working roll speeds of upper and lower rolls. In order to promote the shear deformation during asymmetrical rolling, various deformation parameters of initial sheet thickness, rolling reduction, roll speed ratio and roll radius are considered. The evolution of texture during asymmetrical rolling was shown by the calculation of orientation distribution function (ODF). The effect of deformation parameters on shea. deformation were investigated by simulations with the finite element method (FEM). Asymmetrical rolling gave rise to the development of pronounced strain gradients throughout the thickness layers which resulted in the formation of strong texture gradients in the sheet.

• Transactions of Materials Processing
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• v.26 no.3
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• pp.150-155
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• 2017

To obtain the Goss texture, {110}<001>, IF steel sheets were asymmetrically rolled by 50-89% reduction in the thickness at room temperature and subsequently annealed at 200, 900, and $1200^{\circ}C$ in a box furnace under air atmosphere. The asymmetrically rolled specimens and annealed specimens show well-developed Goss texture, {110}<001>. After the IF steel sheets were asymmetrically rolled at room temperature and subsequently annealed at $900^{\circ}C$ for 1 h in a box furnace under air atmosphere, the intensity of the Goss texture, {110}<001> was high in the IF steel sheets.

• Archives of Pharmacal Research
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• v.27 no.12
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• pp.1258-1262
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• 2004

Phosphodiesterase (PDE) 4 is an enzyme that degrades intracellular cAMP. In the present study, the effect of rolipram, a specific phosphodiesterase (PDE) 4 inhibitor, on osteoclast formation was investigated. Rolipram induced osteoclast formation in cocultures of mouse bone marrow cells and calvarial osteoblasts. This activity was not observed in the absence of calvarial osteoblasts, suggesting that calvarial osteoblasts are likely target cells of rolipram. Osteoclast formation by rolipram was completely blocked by the addition of osteoprotegerin (OPG), a soluble decoy receptor for the osteoclast differentiation factor, TNF-related activation-induced cytokine (TRANCE, identical to RANKL, ODF, and OPGL). Northern blot analysis revealed the effect of rolipram to be associated with the increased expression of TRANCE mRNA in mouse calvarial osteoblasts. Collectively, these data indicate that PDE4 inhibitor up-regulates the TRANCE mRNA expression in osteoblasts, which in turn controls osteoclast formation.

• Bulletin of the Korean Space Science Society
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• 2009.10a
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• pp.24.4-25
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• 2009

We have investigated the radiational fields through a hydrodynamical stellar model atmosphere. Stellar convection zone is the extremely turbulent region composed of partly ionized compressible gases in high temperature. Moreover, super-adiabatic layers are the transition region in energy transport from convection to radiation. Therefore, opacities and thermodynamic properties due to interaction of matter and radiational fields vary significantly with depth. In order to describe radiational fields accurately, the Opacity Distribution Function (ODF) and the Accelerated Lambda Iteration (ALI) have been applied to hydrodynamic medium. As the first result of our radiative transfer, we present time-dependant variation of radiational fields and thermodynamic structures. Our non-gray transfer model has been compared with the conventional Eddington Approximation. Detailed information of radiational fields and thermodynamic properties will provide deeper insight of physical processes inside stellar atmospheres.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.05a
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• pp.324-327
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• 2019

소프트웨어의 비정상적인 작동인 크래시는 보안 취약점의 원인이 된다. 이러한 크래시로부터 야기되는 취약점을 예방하기 위해 다양한 테스트케이스를 생성하고 크래시를 발견 및 분석하는 연구가 지속되고 있다. 본 논문에서는 북한 소프트웨어 서광사무처리체계에서 사용하는 국제 사무용 전자문서 형식인 Open Document Format for Office Application (ODF)의 워드프로세스 문서 형태인 ODT파일의 효과적인 보안 테스트케이스를 찾기 위해 먼저 테스트케이스를 도출한다. 도출된 테스트케이스를 데이터 전처리한 후 Feature Selection 기법을 적용하여 의미 있는 속성들을 분류한다. 마지막으로 ODT 파일 내에 크래시를 유발하는 유의미한 속성들을 확인하고 퍼징 테스트케이스 작성 시 메트릭으로 활용할 수 있다.

• YAKHAK HOEJI
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• v.48 no.3
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• pp.197-201
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• 2004

Phosphodiesterases (PDEs) are enzymes that degrade intracellular cAMP. In the present study, pentoxifylline, a PDE inhibitor, induced osteoclast formation in co-cultures of mouse bone marrow cells and calvarial osteoblasts. To address the involvement of the osteoclast differentiation factor TNF-related activation-induced cytokine (TRANCE, identical to RANKL, ODF, and OPGL), mouse bone marrow cells and calvarial osteoblasts were co-cultured with pentoxifylline in the presence of OPG, a decoy receptor for TRANCE. The osteoclastogenic effect of pentoxifylline was completely blocked by addition of OPG, suggesting that TRANCE is involved in the osteoclast formation induced by pentoxifylline, Northern blot analysis revealed that pentoxifylline significantly induced TRANCE mRNA expression in calvarial osteoblasts. These results suggests that pentoxifylline regulates TRANCE expression in osteoblasts, which in turn controls osteoclast formation.