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Han, Gookhee,Cho, Guangsup The Korean Vacuum Society 2017 Applied Science and Convergence Technology Vol.26 No.6
An electron-excited temperature ($T_{ex}$) is not determined by the Boltzmann plots only with the spectral data of $4p{\rightarrow}4s$ in an Ar-plasma jet operated with a low frequency of several tens of kHz and the low voltage of a few kV, while $T_{ex}$ can be obtained at least with the presence of a high energy-level transition ($5p{\rightarrow}4s$) in the high-voltage operation of 8 kV. The optical intensities of most spectra that are measured according to the voltage and the measuring position of the plasma column increase or decay exponentially at the same rate as that of the intensity variation; therefore, the excitation temperature is estimated by comparing the relative optical-intensity to that of a high voltage. In the low-voltage range of an Ar-jet operation, the electron-excitation temperature is estimated as being from 0.61 eV to 0.67 eV, and the corresponding radical density of the Ar-4p state is in the order of $10^{10}{\sim}10^{11}cm^{-3}$. The variation of the excitation temperature is almost linear in relation to the operation voltage and the position of the plasma plume, meaning that the variation rates of the electron-excitation temperature are 0.03 eV/kV for the voltage and 0.075 eV/cm along the plasma plume.
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제철 슬래그를 이용한 광물 탄산화 기술의 개발 현황과 연구 방향
손민아 ( Minah Son ),김국희 ( Gookhee Kim ),한건우 ( Kunwoo Han ),이민우 ( Min Woo Lee ),임준택 ( Jun Taek Lim ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.2
이 논문에서는 CO<sub>2</sub> 활용 기술 관점에서 광물 탄산화 기술의 하나인 제철 슬래그를 이용한 침강성 탄산칼슘(Precipitated Calcium Carbonate, PCC) 제조 기술의 개발 현황을 고찰하였다. 광물 탄산화 기술의 원리, 특징, 전세계적 개발 현향을 살펴보았고, PCC 제조기술 및 시장동향도 파악하였다. 광물 탄산화는 안정적이고 친환경적인 기술로, 산업 부산물의 경제적 처리를 가능하게 한다. 일반적으로 슬래그중 Ca 용출 및 고액 분리 과정후 상등액과 CO<sub>2</sub>의 반응을 통해 탄산칼슘을 제조한다. 이 기술은 파일럿 단계까지 기술개발이 진행되었으며(알토대학교의 Slag2PCC), 상용화를 위해서는 경제성 증대가 필요할 것으로 판단된다. 개발을 위한 핵심 기술로는 슬래그로부터 Ca의 효과적 용출 및 불순물 제거, 탄산칼슘의 입도 및 입형 제어를 통한 고부가가치화, 잔사 슬래그의 활용방안 발굴, 연속공정 구현을 위한 반응 조건 최적화 등을 들 수 있다. In the present paper, we investigated the development status of precipitated calcium carbonate (PCC) production using steel slag, which is one of mineral carbonation (MC) technologies, from the standpoint of CO<sub>2</sub> utilization. Principle, feature, and global and domestic development status of the mineral carbonation technology were discussed together with the overview of the production method and market of PCC. Mineral carbonation is known as stable and environmentally-friendly technology enabling economical treatment of industrials wastes. Typically, PCC is produced by the reaction of CO<sub>2</sub> with supernatant solution after Ca extraction from steel slag followed by the separation of solid and liquid. The development status of MC using steel slag is at the pilot stage (Slag2PCC at Aalto University), and there remains the process economics improvement for commercialization. Key technologies for the further development are efficient extraction of Ca ions from steel slag including impurities removal, valorization of PCC via shape and size control, usage development and value-addition of residual slag, and optimization of reaction conditions for continuous process setup, etc.
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황성욱(Sungwook Hwang),한진혁(Jinhyuk Han),임형진(HyungJin Im),노국희(Gookhee Rho) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The tire is considered as one of the important noise sources having an influence on vehicle’s performance. The Pattern noise of a tire is the transmission sound of airborne noise. On smooth asphalt road, Pattern noise is amplified with the velocity. In recent, the study on the reduction of Pattern noise is energetically processed. Pattern noise is strongly related with tread groove depth. And air-pumping mechanism is influenced by groove depth. So noise modeling is simulated by monopole source.
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