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활성탄소섬유에 의한 폐액 중 Chromium(6) 의 흡착
정종헌(Chong Hun Jung),정현희(Hyun Hee Jung),문제권(Jei Kwon Moon),오원진(Won Zin Oh),유승곤(Seung Kon Ryu) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.4
The adsorption of Cr(VI) on activated carbon fibers(ACFs) in liquid waste has been studied. The prepared ACFs with highly microporous structure were found to have acidic functional group on the surfaces, which affected greately the adsorption of Cr(VI) ions. The adsorption rates of Cr(VI) on the ACFs were very fast and the reactions reached equilibrium within 1 hr. The ACFs could remove 98 % of Cr(VI) from aqueous solution of 0.75×10^(-3)-10^(-2) molar concentration. During the adsorption of Cr(VI), the solution pH was also changed from 3.0 at the beginning up to 8.5 at equilibrium. This pH change caused the Cr(VI) ions to change into Cr(III) ions, which affected the adsorption characteristics of ACFs.
패킷 교환망에서 가우스 분포 트래픽을 서비스하는 선형 시스템 접근법
정송(Song Chong),신민수(Min-Su Shin),정현희(Hyun-Hee Chong) 한국정보과학회 2002 정보과학회논문지 : 정보통신 Vol.29 No.5
이 논문에서는 자원을 공유하는 여러 개의 QoS(Quality of Service) 큐(queue)를 서비스하기 위한 새로운 서비스 규칙 - 선형 서비스 규칙을 제안하고, 그 특징을 분석하였다. 제안하는 선형 서버는 각각의 큐에 대한 출력 트래픽(traffic) 및 고객 수 과정을 입력 트래픽의 선형 함수로 만든다. 특히 입력 트래픽이 가우스 분포를 갖는 경우에는 큐 길이의 분포와 출력 트래픽 분포가 모두 가우스 분포를 갖게 하며, 그 분포의 평균과 분산이 입력 트래픽의 평균과 전력 스펙트럼(power spectrum)의 함수로 나타나게 한다. 중요한 QoS 척도인 버퍼 넘침 확률 및 지연 분포 역시 입력 트래픽의 평균과 전력 스펙트럼의 함수로 나타나게 된다. 이 연구는 네트워크의 각 노드를 하나의 선형 필터로 볼 수 있게 하므로, 선형 시스템 이론에 기초한 네트워크 전반에 걸친 트래픽 관리 기술의 새로운 방향을 제시하였다. We present a novel service discipline, called linear service discipline, to serve multiple QoS queues sharing a resource and analyze its properties. The linear server makes the output traffic and the queueing dynamics of individual queues as a linear function of its input traffic. In particular, if input traffic is Gaussian, the distributions of queue length and output traffic are also Gaussian with their mean and variance being a function of input mean and input power spectrum (equivalently, autocorrelation function of input). Important QoS measures including buffer overflow probability and queueing delay distribution are also expressed as a function of input mean and input power spectrum. This study explores a new direction for network-wide traffic management based on linear system theories by letting us view the queueing process at each node as a linear filter.
심재운(Jae Woon Shim),정현희(Hyun Hee Jung),정종헌(Chong Hun Jung),오원진(Won Zin Oh),유승곤(Seung Kon Ryu) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
The amount of Cr(VI) adsorbed from aqueous solution in AC and ACF packed column was in proportion to specific surface area of AC and ACF, and the adsorption rate of ACF was 1.5 times faster than that of AC. Owing to release of OH, the pH of solution was increased during adsorption of Cr(VI). The adsorption of Cr(VI) was well performed under 10^(-3)M concentration. However, as the concentration increase, the effluent concentration was suddenly increased in the beginning of flow, which was due to the increase of molar ratio of Cr₂O_7² to HCrO₄. Although the adsorption rate was increased in higher flow rate because of decreasing in film resistance, the amount adsorbed was constant. The minimum bed length for constant pattern was coincided with the length of unused bed.