http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김은하,최효직,고대홍 연세대학교 산업기술연구소 1999 논문집 Vol.31 No.2
Formations of TiSi₂ thin films by a solid state reaction between Ti thin films and Si substrates and the effects of the conditions of Si substrates have been investigated. Low-Resistant C54- TiSi films were formed by rapid thermal processes at 750℃ on the undroped Si (100) substrate, and at 800℃ on the As or B-doped Si (100) substrate as well as on As or B-droped poly-Si substrates. Cross-sectional TEM analyses confirmed the formation of small-grained C49 TiSi₂films by rapid thermal processes at 700℃ on pre-amorphized poly-Si substrate by As implantation. The temperatures of the transformation to the C5 phase decreased in small-grained C49- TiSi₂films. Finally, low resistant C54 TiSi₂thin films were selectively formed on gate, source, and drain regions by SALICIDE process with pre-amorphizaton of substrates. Microstructures and electrical properties of TiSi₂ film were investigated. Sheet resistance of TiSi₂ film on 1.2㎛-wide poly-Si gates was 3.8~4.2Ω/□, and XRD results showed phase formation of C54 TiSi₂ films.
논문 : 댐붕괴 모형과 FLO-2D를 연동한 산대저수지 붕괴 침수 모의
고대홍 ( Dae Hong Go ),이길하 ( Khil Ha Lee ),김진만 ( Jin Man Kim ),김성욱 ( Sung Wook Kim ) 대한지질공학회 2015 지질공학 Vol.25 No.4
갑작스런 저수지 붕괴로 인하여 발생하는 자연재해를 관리하는 효율적인 방법은 홍수위험지도를 작성하는 것이다. 댐붕괴로 인한 홍수위험지도 작성에서 물리적인 현상을 재현해내기 위해서는 유출모형이 사용되는 것이 일반적이며, 모형을 이용하여 잠재적 피해대상지역을 사전에 파악하는데 모형의 정확도가 중요하다. 외국에서 만들어진 기존 상용모형을 검증을 거치지 않고 현장에 적용하는 것은 신뢰성에 문제가 있다. 따라서 모형 예측과 실측의 차이를 비교하여 모형의 정확도를 확인할 필요가 있다. 이 연구에서는 댐붕괴 모형을 하도추적모형인 FLO-2D모형에 연동하여 침수지역을 파악하였다. 모형의 매개변수는 모형의 결과에 중대한 영향을 미치므로 먼저 DEM을 구축한 후 토지피복도로 Manning계수를 산정하고 동시에 토양도를 사용하여 침투과정의 매개변수를 산정하였다. 모의 결과는 침수현장에서 설문조사를 통하여 제작한 현장침수지도와 상대 비교하였다. 침수지역의 수위와 범위 등을 비교한 결과 연구에 사용한 붕괴모형이 침수지역을 적절하게 재현해 내는 것으로 나타났다. The compilation of a flood hazard map is an efficient technique in managing areas at risk of flooding in the case of a dam-break. A scenario-based numerical modeling approach is commonly used to compile a flood hazard map related to dam-break and to determine the model parameters that capture peak discharge, including breach formation and progress, which are important in the modeling method. This approach might be considered less reliable if an existing model is used without local validation. In this study, a dam-break model is linked to a routing model to identify flood-risk areas in the case of failure of the Sandae Reservoir Gyeongju, Gyeongbuk. Model parameters are extracted from a DEM, and maps of land use and soil texture. The simulation results are compared with on-site investigations in terms of inundation and depth. The model reproduces the inundation zone with reasonable accu-racy.
강성관,고대홍,Robert Sinclair 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.9
We investigated the effects of SiH4 gas on the surface of Hf-silicate films during the deposition of polycrystalline (poly) Si films and the thermal stability of sputtered Hf-silicate films in poly Si/Hf-silicate structure by using high resolution transmission electron microscopy (HR-TEM) and x-ray photoelectron spectroscopy (XPS). Hf-silicate films were deposited by using DC-magnetron sputtering with Hf target and Si target and poly Si films were deposited at 600oC by using low pressure chemical vapor deposition (LPCVD) with SiH4 gas. After poly Si film deposition at 600oC, Hf silicide layer was observed between poly Si and Hf-silicate films due to the reaction between active SiH4 gas and Hf-silicate films. After annealing at 900oC, Hf silicide, formed during the deposition of poly Si, changed to Hf-silicate and the phase separation of the silicate was not observed. In addition, the Hf-silicate films remain amorphous phase.
김성욱,고대홍,최은경,김성환,김태형,이규환,조진우,Kim, Sung-Wook,Go, Daehong,Choi, Eun-Kyeong,Kim, Sung-Hwan,Kim, Tae-Hyoung,Lee, Kyu-Hwan,Cho, Jinwoo 대한자원환경지질학회 2017 자원환경지질 Vol.50 No.2
다공성 구조의 장석과 주택 시방기준으로 제작된 바닥 축열층 모르타르의 열적 특성과 소비전력을 비교하였다. 실험을 위해 온수관이 설치된 2개의 실대형 모형을 제작하였다. 자외선 열화상 온도와 온도센서를 이용하여 가열과 냉각과정에서 축열층의 온도변화를 모니터링하였다. 시험동의 축열층은 $20-30^{\circ}C$ 구간의 온도 범위의 가열조건에서 $2-3.5^{\circ}C$ 높은 온도를 보였고 목표 온도에 도달하는 시간이 단축되었다. 온수관에서 멀어질수록 $4-4.8^{\circ}C$ 이상의 차이를 보였고 이는 장석 기반의 모르타르 축열층이 열적 평형에 빨리 도달하는 것을 지시한다. 가열 온도 $30^{\circ}C$를 기준으로 산정한 소비전력은 2.2배 차이를 보였고 단계별 온도 상승에서 소비전력은 66% 절감되었다. 냉각에서 시험동의 표면온도는 지속해서 $2^{\circ}C$ 이상 높았고 축열로 인해 보일러의 재가동 시간이 연장되는 것을 고려하면 에너지 효율은 더 증가할 것이다. The temporal and spatial temperature distribution of the heat storage mortar made of porous feldspar was measured and the thermal properties and electricity consumption were analyzed. For the experiment, two real size chambers (control model and test model) with hot water pipes were constructed. Two large scale models with hot water pipes were constructed. The surface temperature change of the heat storage layer was remotely monitored during the heating and cooling process using infrared thermal imaging camera and temperature sensor. The temperature increased from $20^{\circ}C$ to $30^{\circ}C$ under the heating condition. The temperature of the heat storage layer of the test model was $2.0-3.5^{\circ}C$ higher than the control model and the time to reach the target temperature was shortened. As the distance from the hot water pipe increased, the temperature gap increased from $4.0^{\circ}C$ to $4.8^{\circ}C$. The power consumed until the surface temperature of the heat storage layer reached $30^{\circ}C$ was 2.2 times that of the control model. From the heating experiment, the stepwise temperature and electricity consumption were calculated, and the electricity consumption of the heat storage layer of the test model was reduced by 66%. In the cooling experiment, the surface temperature of the heat storage layer of the test model was maintained $2^{\circ}C$ higher than that of the control model. The heat storage effect of the porous feldspar mortar was confirmed by the temperature experiment. With considering that the time to reheat the heat storage layer is extended, the energy efficiency will be increased.