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CANDU-6 열수송 계통의 유동 진동감쇠에 의한 유동안정성 연구
김태한,심우건,한상구,정종식,김선철 한국소음진동공학회 1996 소음 진동 Vol.6 No.2
An investigation on thermohydraulic stability of flow oscillations in the CANada Deuterium Uranium-600(CANDU-6) heat transport system has been conducted. Flow oscillations in reactor coolant loops, comprising two heat sources and two heat sinks in series, are possibly caused by the response of the pressure to extraction of fluid in two-phase region. This response consists of two contributions, one arising from mass and another from enthalpy change in the two-phase region. The system computer code used in the investigation os SOPHT, which is capable of simulating steady states as well as transients with varying boundary conditions. The model was derived by linearizing and solving one-dimensional, homogeneous single- and two-phase flow conservation equations. The mass, energy and momentum equations with boundary conditions are set up throughout the system in matrix form based on a node-link structure. Loop stability was studied under full power conditions with interconnecting the two compressible two phase regions in the figure-of-eight circuit. The dominant function of the interconnecting pipe is the transfer of mass between the two-phase regions. Parametric survey of loop stability characteristics, i. e., damping ratio and period, has been made as a function of geometrical parameters of the interconnection line such as diameter, length, height and orifice flow coefficient. The stability characteristics with interconnection line has been clarified to provide a simple criterion to be used as a guide in scaling of the pipe.
기후변화적응형 도시림 조성을 위한 i-Tree Canopy 기반
김태한,이재영,송창길,오지은 한국반도체디스플레이기술학회 2024 반도체디스플레이기술학회지 Vol.23 No.1
The accelerated pace of climate crisis due to continuous industrialization and greenhouse gas emissions necessitates sustainable solutions that simultaneously address mitigation and adaptation to climate change. Nature-based Solutions (NbS) have gained prominence as viable approaches, with Green Infrastructure being a representative NbS. Green Infrastructure involves securing green spaces within urban areas, providing diverse climate adaptation functions such as removal of various air pollutants, carbon sequestration, and isolation. The proliferation of Green Infrastructure is influenced by the quantification of improvement effects related to various projects. To support decision-making by assessing the climate vulnerability of Green Infrastructure, the U.S. Department of Agriculture (USDA) has developed i-Tree Tools. This study proposes a comprehensive evaluation approach for climate change adaptation types by quantifying the climate adaptation performance of urban Green Infrastructure. Using i-Tree Canopy, the analysis focuses on five urban green spaces covering more than 30 hectares, considering the tree ratio relative to the total area. The evaluation encompasses aspects of thermal environment, aquatic environment, and atmospheric environment to assess the overall eco-friendliness in terms of climate change adaptation. The results indicate that an increase in the tree ratio correlates with improved eco-friendliness in terms of thermal, aquatic, and atmospheric environments. In particular, it is necessary to prioritize consideration of the water environment sector in order to realize climate change adaptive green infrastructure, such as increasing green space in urban areas, as it has been confirmed that four out of five target sites are specialized in improving the water environment.
당근 중 Difenoconazole 10.7% 액상 수화제의 잔류분석 및 안전사용기준 설정
김태한,Zhu, YongZhe,김사무엘,박동식,허장현 강원대학교 농업과학연구소 2003 강원 농업생명환경연구 Vol.14 No.-
The objective of this study was to determine residue of difenoconazole (Suspension concentrate, SC) in carrot using gas liquid chromatography (GLC) with electron capture detecter (ECD) and to set the safety use guideline of this chemical in the carrot. Difenoconazole is used to control sooty leaf blight (Alternaria dauci) on carrot. For the recovery tests with 0.1 mg kg^(-1) and 0.5 mg kg^(-1), the average recoveries were 92.6% and 98.3%, respectively and detection limit was 0.01 mg kg^(-1). Difenoconazole is treated two times until 10 and 20 days before harvest and three times until 10 days before harvest of carrot. Residual amounts of difenoconazole in carrot were 0.10, 0.05 mg kg&(-1) and 0.11 mg kg^(-1), respectively. The maximum residue limit (MRL) of difenoconazole in the U. S. A. is 0.05 mg kg^(-1), and Korea is 0.2 mg kg^(-1), respectively. It seems to be safely used when difenoconazole is treated two times carrots until 20 days before harvest of carrot.
The Role of Interest and Self-Efficacy in English Achievement among Korean Youth
김태한 미래를 여는 청소년학회 2012 미래청소년학회지 Vol.9 No.1
This integrative study examined the longitudinal effect of academic interest and self-efficacy on English achievement among Korean youth using 2005-2007 data from the Korean Educational Longitudinal Study based on English studied at middle school grade levels. A latent growth curve analysis identified that academic interest and self-efficacy in English have significant effects on English achievement over time. This study found that academic interest and academic self-efficacy in English have differential effects on English achievement. While academic interest in English is the most powerful variable affecting achievement in the 8^th and 9^th grades, academic self-efficacy in English is the strongest predictor of English achievement at the initial grade (7^th). A discussion of the findings and suggestions for future research are presented.