• 한국표면공학회:학술대회논문집
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• 한국표면공학회 1998년도 추계학술발표회 초록집
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• pp.50-50
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• 1998

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2005년도 추계학술발표회
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• pp.169-170
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• 2005

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.355-356
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• 2011

• 한국동물학회:학술대회논문집
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• 한국동물학회 2001년도 공동 춘계학술대회
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• pp.67.2-67
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• 2001

No Abstract, See Full Text

• 대한화학회지
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• 제34권5호
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• pp.396-403
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• 1990

일반적인 화학증기증착(CVD : Chemical Vapor Deposition)실험에서 반응기작을 연구할 수 있는 LPCVD (Low Pressure CVD) 장치의 설계 및 제작에 관한 것과, 특히 이 장치를 이용하여 메탄, 수소의 혼합기체와 헬륨을 완충(buffer) 가스로 사용하여 p-type (111) Si wafer 위에 다이아몬드 박막(diamond film)을 얻고자 시도한 것에 대하여 기술하였다. 실험은 두 가지 방법으로 나누어서 행하였다. (1) Si wafer를 반응기 안에 있는 heater(약 480$^{\circ}C$)위에 놓고 두 개의 다른 inlet 가스관을 사용하여 실험하였다. Posphoric acid로 coating된 하나의 관은 microwave discharge시킨 수소 기체를 흘려주는데 사용하였고, 다른 관은 discharge시키지 않은 메탄 기체를 흘려주는데 사용하였다. 그 결과로 무정형 탄소 뭉치 화합물(amorphous carbon cluster)을 얻었다. (2) 수소와 메탄을 동시에 discharge시켜 plasma 상태인 discharge tube안에 Si wafer을 넣고 증착시켜, 그 결과로 다이아몬드 구조를 갖은 반응생성물을 얻었다.

• Progress in Superconductivity
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• 제14권2호
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• pp.99-101
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• 2012

Fluorescent yield X-ray absorption fine structure (XAFS) spectroscopy is useful for analyzing local structure of specific elements in matrices. We developed an XAFS apparatus with a 100-pixel superconducting tunnel junction (STJ) detector array with a high sensitivity and a high resolution for light-element dopants in wide-gap semiconductors. An STJ detector has a pixel size of $100{\mu}m$ square, and an asymmetric layer structure of Nb(300 nm)-Al(70 nm)/AlOx/Al(70 nm)-Nb(50 nm). The 100-pixel STJ array has an effective area of $1mm^2$. The XAFS apparatus with the STJ array detector was installed in BL-11A of High Energy Accelerator Research Organization, Photon Factory (KEK PF). Fluorescent X-ray spectrum for boron nitride showed that the average energy resolution of the 100-pixels is 12 eV in full width half maximum for the N-K line, and The C-K and N-K lines are separated without peak tail overlap. We analyzed the N dopant atoms implanted into 4H-SiC substrates at a dose of 300 ppm in a 200 nm-thick surface layer. From a comparison between measured X-ray Absorption Near Edge Structure (XANES) spectra and ab initio FEFF calculations, it has been revealed that the N atoms substitute for the C site of the SiC lattice.

• 한국안전학회지
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• 제35권3호
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• pp.96-104
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• 2020

The numerical simulations were conducted to investigate the thermal-fluid phenomena occurred inside the experimental apparatus during a PCCS, used to remove heat released in accidents from a containment of light water nuclear power plant, operation. Numerical simulations of the flow and heat transfer caused by wall condensation inside the containment simulation vessel (CSV), which equipped with 18 vertical heat exchanger tubes, were conducted using the commercial computational fluid dynamics (CFD) software ANSYS-CFX. Shear stress transport (SST) and the wall condensation model were used for turbulence closure and wall condensation, respectively. The simulation using the actual size of the apparatus. However, rather than simulating the whole experimental apparatus in consideration of the experimental cases, calculation resources, and calculation time, the simulation model was prepared only in CSV. Selective simulation was conducted to verify the effects of non-condensable gas(NC gas) concentration, CSV internal pressure, and wall sub-cooling conditions. First, as a result of the internal flow of CSV, it was observed that downward flow due to condensation occurred surface of the vertical tube and upward flow occurred in the distant place. Natural convection occurred actively around the heat exchanger tube. Due to this rising and falling internal flow, natural circulation occurred actively around the heat exchanger tubes. Next, in order to check the performance of built-in condensation model using according to the non-condensable gas concentration, CSV internal flow and wall sub-cooling, the heat flux values were compared with the experimental results. On average, the results were underestimated with and error of about 25%. In addition, the influence of CSV internal pressure and wall sub-cooling was small, but when the condensate was highly generated due to the low non-condensable gas concentration, the error was large compared to the experimental values. This is considered to be due to the nature of the condensation model of the CFX code. However, in spite of the limitations of CFD, it is valid to use the built-in condensation model of CFD for PCCS performance prediction from a conservative perspective.

• 한국임상수의학회지
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• 제37권3호
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• pp.163-167
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• 2020

A 13-month-old, 3.3 kg castrated male Shih-tzu presented with right hindlimb lameness. The physical examination revealed atrophy of the right thigh muscles, hyperextension of the stifle joint and external torsion of the tibia. On the radiographic examination, patella alta and genu recurvatum were observed. A biapical deformity of the tibia and external torsion of the distal tibia were detected by computed tomography (CT). A three-dimensional (3D) printed bone model was designed and constructed for the preoperative plan prior to surgery. Rectus femoris muscle transposition, femoral shortening ostectomy and open wedge osteotomy of the distal tibia were performed using hybrid external skele/t0al fixation (hybrid-ESF). A dynamic stifle flexion apparatus was used to prevent recurrence of a quadriceps contracture (QC). Intense physiotherapy was administered postoperatively. The dog began to use the affected limb one week after surgery. Functional improvement in the affected limb was observed, and full weight-bearing was possible at 3 months after surgery. Union of the osteotomy lines was observed at 3 months, and the stifle joint was fully movable at 7 months after surgery. Regarding the treatments for QC, these methods may be excellent candidates, as they do not lead to severe damage to the limb or amputation.

• 한국융합학회논문지
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• 제7권6호
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• pp.287-295
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• 2016

본 연구는 중 고등학교에 재학 중이며 학교에서 정서 및 행동에 문제가 있고, 불안, 우울, ADHD 성향을 나타내는 청소년들을 대상으로 12주간 주 2회, 1회 운동 시간 60분간 승마운동프로그램과 승마기구운동프로그램을 실시하였다. 사전 후 검사로 청소년 정서 행동발달 선별검사척도, 불안척도, 우울척도, ADHD척도를 사용하였으며 승마운동 프로그램의 효과를 검증하기 위하여 두 집단 간 사전, 사후에 걸쳐 반복 측정한 점수들에 대하여 이원변량분석을 실시하여 분석한 결과 다음과 같은 결론을 얻었다. 본 연구에서 실시한 승마운동과 승마기구운동 프로그램이 정서 행동발달 및 불안과 우울, ADHD에 긍정적인 영향을 미쳤으며, 승마운동이 승마기구운동보다는 더 긍정적인 효과가 있는 것으로 판단된다. 하지만 승마운동과 승마기구운동의 효과에 대한 비교를 보다 명확하게 하기 위해서는 통제군을 둔 연구가 필요할 것으로 사료된다.

• 한국약용작물학회지
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• 제12권3호
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• pp.209-213
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• 2004

토천궁은 개화는 되지만 종자 결실이 이루어지지 않아 주로 종근이나 뇌두에 의해 번식하므로 번식율이 매우 저조한 특성이 있다. 따라서 이의 원인을 구명하고자 자웅배우체 형성과정과 자가수분을 통한 수정현상을 보기 위하여 조사하였던 바 그 결과는 다음과 같다. 토천궁은 대소포자에서 감수분열이 정상적으로 이루어지고 배낭형성에서 난장치는 50% 정도가 정상적으로 이루어지고, 화분형성에서는 90%이상이 잘 이루어졌다. 토천궁의 배낭은 주심조직의 세포가 작아 모든 기관분열에서 관찰하기가 어려웠고 특히 토천궁은 배낭 형성체가 난장치로 발달되는 꽃은 거의 없었으며 화분립은 일부가 형성 되었다.