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백종훈,강병하,장호명,Baik, J.H.,Kang, B.H.,Chang, H.M. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.3
A hydrogen liquefaction equipment by direct cooling has been designed and built at KIST. Cool-down characteristics and liquefaction performance of the equipment have been investigated. The hydrogen liquefaction equipment consists of a GM refrigerator, a liquefaction velssel, a radiation shield and a cryostat. It is found that the hydrogen starts to be liquefied in the liquefaction vessel after 40~50 minutes of cool-down from the gas state of 270K. The effect of natural convection phenomena of charged gas in liquefaction vessel on the cool-down characteristics is evaluated by comparing with those in vacuum of liquefaction vessel. It is seen that the cool-down time of a liquefaction vessel is substantially increased in vacuum environment of liquefaction vessel. The experiments have been performed for 1~5 atm of hydrogen pressure to investigate the influence of hydrogen pressure on the liquefaction rate and figure of merit(FOM). It is found that both liquefaction rate and FOM are increased as the charged hydrogen pressure is increased.
장주기 성분 지진파에 의한 고층 건축 구조물의 응답특성에 관한 실험적 연구
백종훈,오상훈 한국외국어대학교 국제지역연구센터 2014 국제지역연구 Vol.18 No.3
Michoacan Mexico City 지진(규모 8.1, 1985, Mexico), Tokachi-oki 지진(규모 8.0, 2003,Japan), Tohoku 지진(규모 9.1, 2011, Japan)에서는 진원지로부터 200km ~800km 이상 떨어져 있는 원거리 지역에 위치한 중·고층 규모의 구조물에 피해가 발생하였다. 이는 일반적으로고주파의 특성을 갖는 지진파가 원거리 지역까지 전달되는 과정에서 장주기화 되고, 특히 지반이 연약한 지역에서는 지진가속도가 증폭되어 그 피해가 더욱 커진 것으로 예상된다. 우리나라는 중·약진지역으로 분류되나, 최근 그 폭발 가능성이 제기되고 있는 백두산 화산에 의한지진과 일본 지역에서 발생할 수 있는 큰 규모의 지진에 대하여 연약지반에 고층 건물들이 밀집하여 있는 서울강남, 인천송도, 부산 해운대 등의 지역에 지진파의 장주기화에 따른 피해발생 가능성이 존재한다. 이에 본 연구에서는 전 세계적으로 발생한 장주기 성분 지진에 의한피해사례와 지진기록을 분석하고, 이를 바탕으로 장주기 지진파에 대한 고층 건축물의 응답특성을 파악하기 위하여 진동대 실험을 수행하고, 그 결과를 분석하였다. 연구 결과, 국내 지역에 장주기 성분 지진이 도달할 경우, 고층 건물들은 높은 가속도 응답증폭비율로 인하여 그피해 발생 가능성이 높은 것으로 나타나 이에 대한 대비가 필요 할 것으로 판단된다. In Michoacan Mexico City Earthquake(Magnitude 8.1, 1985, Mexico), Tokachi-oki Earthquake(Magnitude 8.0, 2003, Japan), Tohoku Earthquake(Magnitude 9.1, 2011, Japan), mid & high-risestructures located in the remote area of 200km~800km or more away from the epicenter were mainlydamaged. In the course of seismic waves with the characteristics of high frequency are transmitted tothe long distance region, it becomes long periodization. In areas of weak ground, particularly seismicacceleration is amplified and it is expected that the damage is further increased. South Korea isclassified as region of low-to moderate seismicity, but there exist the possibilities of damage bylong-period strong motion in case of Gangnam, Songdo, and Haeundae regions. In this study, we analyze the components of the long-period earthquakes and earthquake recordedcases occurred worldwide, performed the shaking table test to figure out the response characteristicsof a high-rise buildings on the long-period seismic waves and analyzed the results. Results of thestudy, when the earthquake of long-period component has reached the regions of domestic areas, wepredicted that there exist possibilities of damage to high-rise buildings because of high accelerationamplification rate. In conclusion, it is needed that we need to prepare for it.
다변량 통계기법을 활용한 중규모 하천의 수질 특성 분석
백종훈,범진아,박민경,정민혁,정지연,윤광식 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.3
This study identified key management target water quality constituents reflecting watershed characteristics and evaluated water quality characteristics through multivariate statistical techniques targeting the Gwangju, Manbong, and Munpyeong stream watersheds of the Yeongsan River basin. The main components for the water quality factors were nutrients in Gwangju Stream and Munpyeong Stream, and organic matter in Manbong Stream, respectively. Cluster analysis over time for water quality classified into 2 groups for Gwangju Stream, but Manbong Stream and Munpyeong Stream were classified into 5 and 4 groups, respectively. Temporal changes due to agricultural activities were assessed to contribute to clustering. The main water quality factors and the time of inflow of water quality constituents are different depending on the characteristics of the watersheds. Therefore, it should be considered in the watershed management for stream water quality.
오존 산화에 의해 형성된 터널 실리콘 산화막의 표면 패시베이션
백종훈,조영준,장효식,Baek, Jong Hoon,Cho, Young Joon,Chang, Hyo Sik 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.5
In order to achieve a high efficiency for the silicon solar cell, a passivation characteristic that minimizes the electrical loss at a silicon interface is required. In this paper, we evaluated the applicability of the oxide film formed by ozone for the tunnel silicon oxide film. To this end, we fabricated the silicon oxide film by changing the condition of ozone oxidation and compared the characteristics with the oxide film formed by the existing nitric acid solution. The ozone oxidation was formed in the temperature range of $300{\sim}500^{\circ}C$ at an ozone concentration of 17.5 wt%, and the passivation characteristics were compared. Compared to the silicon oxide film formed by nitric acid oxidation, implied open circuit voltage (iVoc) was improved by ~20 mV in the ozone oxidation and the ozone oxidation after the nitric acid pretreatment was improved by ~30 mV.
백종훈,강병하,홍성제,장호명 대한설비공학회 1999 설비공학 논문집 Vol.11 No.4
The Joule-Thomson cryocooler with $H_2$gas has been developed. Cool-down characteristics and the cooling performance of a JT cryocooler have been investigated in detail. The JT cryocooler consists of JT expansion valve, heat exchanger, expansion chamber, compressed $H_2$gas storage tank, $LN_2$precooler, heater and a cryostat. The precooling process using both $GN_2$and $LN_2$was peformed to cool down the inside components of cryocooler under the maximum inversion temperature of $H_2$. The $H_2$expansion experiments have been peformed for 2-5MPa of H$_2$pressure to evaluate steady state temperatures of the cryocooler. It is found that the steady state temperatures are decreased as the H$_2$pressures are increased. The effects of cooling temperatures on the performance have been evaluated for various $H_2$and $N_2$pressures. It is seen that the cooling loads are increased, as the cooling temperature and operating pressure are increased.
실제기체의 물성을 이용한 Stirling 냉동기 단열해석
백종훈,장호명,Baik, J.H.,Chang, H.M. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.1
A Finkelstein adiabatic analysis is performed for Stirling refrigerator with real gas properties of helium. The mass balance and the energy balance equations are formulated into the form that is convenient for incorporating an available computer code of the helium properties. The differential equations are solved numerically. The calculated coefficient of performance(COP) and the pressure variation are compared with the results obtained when helium is assumed to be an ideal gas. The relative errors in COP are presented as functions of the refrigeration temperature and the maximum cycle pressure.