• Proceedings of the Korea Association of Crystal Growth Conference
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• 1997.10a
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• pp.93-97
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• 1997

$CO_2$ gas를 초임계상태의 유체로하고 그 용매에 코팅물질인 파라핀을 용해시켜 초임계 분출법(RESS)에 의해 핵입자 코팅을하여 복합입자를 제조하였고 그 용출 특성을 고찰하였다. 핵입자로는 입도분포가 다른 Glassb eads, Brilliant Blue(이하 BB)를 피복한 Glass beads, 분무건조법으로 제조한 염기성 탄산마그네시아의 Microcapsule(이하 MHC MC)을 사용하였다. 제조된 복합분체 표면을 SEM으로 관찰하였고 FT-IR을 사용하여 표면의 성분분석을 하였다. BB로 피복시킨 Glass beads는 Spectrophotometer로 BB가 용출되는 시간을 측정하였고 AA로 MHC MC중 Mg2+ ion의 release time이 7min, 26min, 30min으로 반응부에서 포집한 시료의 용출특성이 제일 우수하였다.

• Proceedings of the Korea Contents Association Conference
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• 2011.05a
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• pp.169-170
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• 2011

종교의 문제는 단순한 개인의 종교 문제를 넘어 사회 분열과 통합, 갈등의 문제로 진화되었다. 역사상 종교의 힘은 한 사회를 통합시킬 수도 있고, 반대로 한 사회를 해체할 수도 분열시킬 수도 있는 막강한 힘을 지니고 있다는 것을 보여주고 있다. 세계 곳곳에서 발생하는 테러의 원인 중의 하나 종교문제이다. 이제 한국사회도 다종교사회로 이미 진입했고, 많은 종교단체 같은 종교 내에서도 종파와 종단이 수 십 수백으로 공존하고 있다. 종교간 갈등과 같은 종교내 종단(宗團)안에서 갈등과 대립현상이 분출되고 있다. 종교계의 정치관여 또는 참여 문제와 관련하여 종교계가 본격적인 정당창당이나 정당과의 연합을 통해 정치세력화 할 경우, 이 문제를 우리 사회가 어떻게 할 것인가도 진지하게 논의할 문제이다.

• Proceedings of the KIEE Conference
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• 2005.04a
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• pp.108-110
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• 2005

배전용 변압기의 경우 고장 발생시 직접적인 수용가 측에 피해가 발생되며, 변압기 폭발시 인명 피해까지 우려되고 있다. 변압기 내부 고장으로 절연유가 분출될 경우가 가장 심각한 고장으로 이러한 피해를 방지하기 위해서는 내부 고장에 대한 정확한 해석이 필요하다. 본 연구에서 변압기 권선내에서 발생되는 고장을 유한요소 전자계해석 프로그램(FLUX2D)을 이용하여 해석하였다. 50kVA, 13200/230(V) 단강 변압기의 권선고장시 전자계해석, 1차측 권선고장(turn-to-earth)과 2차측 권선고장(turn-to-turn)을 모의하여 해석하였다. 또한, 권선 내부 고장 및 2차측 단락시 누설자속분포, 1차 및 2차측 고장전류, 권선간의 힘의분포 등을 해석하였다. 분석결과는 변압기의 절연설계 및 단락기계력에 대한 프레임 구조 설계를 위한 자료로 활용된다.

• The Korean Journal of Petroleum Geology
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• v.5 no.1_2 s.6
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• pp.9-15
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• 1997

The study area is located in the Central Bransfield Basin, Antarctica. To analyze the morphology of seafloor, structure of basement, and seismic stratigraphy of the sedimentary layers, we have acquired, processed, and interpreted the multi-channel seismic data. The northwest-southeastern back-arc extension dramatically changes seafloor morphology, volcanic and fault distribution, and basin structure along the spreading ridges. The northern continental shelf shows a narrow, steep topography. In contrast, the continental shelf or slope in the south, which is connected to the Antarctic Peninsula, has a gentle gradient. Volcanic activities resulted in the formation of large volcanos and basement highs near the spreading center, and small-scale volcanic diapirs on the shelf. A very long, continuous normal fault characterizes the northern shelf, whereas several basinward synthetic faults probably detach into the master fault in the south. Four transfer faults, the northwest-southeastern deep-parallel structures, controlled the complex distributions of the volcanos, normal faults, depocenters, and possibly hydrocarbon provinces in the study area. They have also deformed the basement structure and depositional pattern. Even though the Bransfield Basin was believed to be formed in the Late Cenozoic (about 4 Ma), the hydrocarbon potential may be very high due to thick sediment accumulation, high organic contents, high heat flow resulted from the active tectonics, and adequate traps.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.41 no.3
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• pp.191-197
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• 2017

In this study, the visualization of the unsteady flow field of a Weis-Fogh-type water turbine was investigated using particle-image velocimetry. The visualization experiments were performed in a parameter range that provided relatively high-efficiency wing conditions, that is, at a wing opening angle ${\alpha}=40^{\circ}$ and at a velocity ratio of the uniform flow to the moving wing U/V = 1.5~2.5. The flow fields at the opening, translational, and closing stages were investigated for each experimental parameter. In the opening stage, the fluid was drawn in between the wing and wall at a velocity that increased with an increase in the opening angle and velocity ratio. In the translational stage, the fluid on the pressure face of the wing moved in the direction of the wing motion, and the boundary layer at the back face of the wing was the thinnest and had a velocity ratio of 2.0. In the closing stage, the fluid between the wing and wall was jetted at a velocity that increased as the opening angle decreased; however, the velocity was independent of the velocity ratio.

• Journal of the Society of Naval Architects of Korea
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• v.36 no.3
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• pp.41-49
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• 1999

A feasibility study is performed for practical application of a Ventilating Water-Jet(VWJ) propulsor which attracts new attention as a candidate propulsor for super-high speed vessels. Super-cavitating foil sections are adopted for the rotor blades since the rotor is operating at ventilating condition. Wedge type and cavitator type foil sections are used for the design of rotor blades. Other geometric characteristics of rotors are selected from the Kaplan type ducted propeller rotors. The test section of KRISO cavitation tunnel is modified to perform open-water tests of the VWJ propulsors. The tests are performed both at fully-submerged and free-jet conditions. Ventilation occurred at the free-jet condition by sucking the air in the downstream side of the rotor, which easily develops as super-cavitation when the rotor operates at lower advance coefficients. Spoilers are attached at the trailing end of the pressure side of the blade section, in order to increase the lift force.

• Journal of Satellite, Information and Communications
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• v.7 no.3
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• pp.110-115
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• 2012

Satellite structure should be designed to accommodate and support safely the payload and equipments necessary for its own missions and to secure satellite and payloads from severe launch environments. The launch environments imposed on satellites are quasi-static accelerations, aerodynamic loads, acoustic loads and shock loads. Currently KARI(Korea Aerospace Research Institute) is developing Geo-KOMPSAT-2(Geostationary Earth Orbit KOrea Multi-Purpose Satellite) with technologies which were acquired during COMS(Communication, Ocean and Meteorological Satellite) development. As compared to COMS Geo-KOMPSAT-2 requires more propellant due to mass increase of Advanced Meteorological Payload with high resolution and increase of miss life, it is difficult to apply the design concept of COMS to Geo-KOMPSAT-2. This paper deals with conceptual design of Structural Subsystem for Geo-KOMPSAT-2.

• Clinical and Experimental Pediatrics
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• v.49 no.3
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• pp.326-328
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• 2006

Chyluria is the passage of milky urine due to the leakage of lymph into the urinary tract. Chyluria occurs predominantly in adults and is rare in children. We present an unusual case in which a child with proteinuria, hematuria and milky urine was subsequently diagnosed with non-parasitic chyluria. Retrograde cystogram confirmed a lymphatico-calyceal communication. This case showed spontaneous remission. The etiology of this case was not exactly known; however, the prognosis of non-parasitic chyluria (or idiopathic chyluria) is usually very good and the treatment is mostly conservative.

• KASI NEWSLETTER
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• s.52
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• pp.1-6
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• 2005

박석재 원장 '2005 닮고 싶고 되고 싶은 과학기술인'에 선정/ 신임 감사에 오재건 과학기술단체총연합회 연구위원 선임/ 한-일 전파영상합성기 공동개발에 관한 협정 체결/ 2006년 1월 1일 윤초 실시/ 우리 연구원 대 국민 서비스 가치 연간 3,646 억원/ 지질연구원과 연구협력 협약 체결/ 2005 대한민국 과학축전 별 축제 개최/ 혁신경영 및 전략 경영목표 수립을 위한 워크숍 개최/ 2005년 KVN 전파간섭계 여름학교 개최/ 템펠 1 혜성 - 딥 임팩트 원격관측/ 별에서 분출되는 제트와 암흑성운의 충돌 장면 포착/ 2005 하계 교원천문연수 개최/ 연구원 방문의 날 행사 개최/ 아마추어 천문학 축제 한마당/ 한국천문연구원 우주가족 캠프 실시/ 콜로키움/ 손봉원 박사 Marquis Who"s Who 인명사전에 등재/ 2005 대한민국 별 축제 개최/ 인사/ 학계동정/ 남반구 무인 자동 네트워크 관측소

• Journal of Power System Engineering
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• v.3 no.3
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• pp.36-43
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• 1999

Many of thermodynamic-based diesel combustion simulations incorporated a model of fuel spray which attempts to describe how the spray develops according to time. Because the spray geometry is an essential aspect of the fuel-air mixing process, it is necessary to be calculated quantitatively for the purpose of heat release and emission analysis. In this paper, we proposed the calculating method of non-evaporation spray behaviors by injection rate shapes under actual operating conditions of diesel engine. We confirmed the utility of this calculating model as the calculated results were compared with the measured results. This calculating program can be applied usefully to study on the diesel spray behavior.