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Jei-Kwon Moon,Byambatseren Baigalmaa,Hui-Jun Won,Kune-Woo Lee 한국방사성폐기물학회 2010 방사성폐기물학회지 Vol.8 No.3
레이저 용발법에 의한 금속 표면 제염특성을 평가하였다. 레이저로는 파장 532 nm, 펄스에너지 150 mJ, 펄스폭 5 ns의 큐스위치 Nd:YAG 를 적용하였고, 금속 표면에 CsNO3, Co(NH4)2(SO4)2, Eu2O3 그리고 CeO2를 오염시켜 이들의 제염 특성을 평가하였다. 제염 변수로는 레이저 적용횟수, 레이저 에너지 밀도 및 레이저 조사 각도 특성을 평가하였으며 각각 8, 13.3 J/cm2 및 30o의 최적 조건을 확인하였다. 제염 효율은 오염성분의 비점과 관련이 있었으며 CsNO3>Co(NH4)2(SO4)2>Eu2O3>CeO2 순이었다. 또한 여러 에너지 밀도 조건에서 스테인레스 스틸 재질의 식각 깊이 제어 특성을 규명하였다. Metal surface decontamination characteristics were investigated by using a laser ablation method. A second harmonic generation of a Q-switched Nd:YAG laser with a wave length of 532 nm, a pulse energy of 150 mJ and a pulse width of 5 ns was employed to assess the decontamination performance for metal surfaces contaminated with CsNO3, Co(NH4)2(SO4)2, Eu2O3 and CeO2. The ablation behavior was investigated for the decontamination variables such as a number of laser shots, laser fluence and an irradiation angle. Their optimum values were found to be 8,13.3 J/cm2 and 30o, respectively. The decontamination efficiency was different depending on the kinds of the contaminated ions, due to their different melting and boiling points and was in the order: CsNO3>Co(NH4)2(SO4)2>Eu2O3>CeO2. We also evaluated a correlation between the metal ablation thickness and the number of laser shots for the different laser fluences.
Moon, Jei-Kwon,Jung, Chong-Hun,Lee, Byung-Chul,Shin, Chae-Ho Taylor Francis 2008 Separation science and technology Vol.43 No.3
<P> Adsorptive separation of palladium from a nitric acid solution was performed by using a pitch-based activated carbon fiber modified with NaOH (NaOH-ACF). The NaOH-ACF showed a markedly improved adsorption performance for the palladium ions as compared with the untreated ACF. It also showed a much higher preferential adsorption for the palladium ion over the rhodium and rhenium ions. The equilibrium capacity of the NaOH-ACF for palladium was 1.25 meq · g-1. The breakthrough behavior obtained by using the bed packed with the NaOH-ACF showed a complete separation of palladium from the coexisting ions of rhodium and rhenium. The spent bed was eluted effectively with nitric acid and a palladium nitrate with a purity of higher than 99% could be recovered.</P>
문제권,오민 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.5
o-xylene로부터 PA를 생산하는 관형 촉매반응기의 수학적 모델을 수립하고 이를 바탕으로 한 동적최적화를 수행하였다. 촉매반응기시스템의 수학적 모델은 IPDAEs로 표현되며 MOL방법을 사용하여 시간에 대하여 변화하는 DAEs으로 변환하였다. 바뀌어진 DAEs에 포함된 제어변수를 CVP 방법을 통하여 간단한 다항식으로 표현하여 유한차원의 NLP문제로 바꾸었다. 이러한 과정을 통하여 최종적으로 나타난 동적최적화 문제는 NLP와 시간적분의 외부 loop와 내부 loop를 반복적으로 계산하는 과정을 통하여 수치해를 구하였다. 여러 다른 제어전략에 대하여 동적최적화를 수행하고 결과를 비교하였다. 목적함수는 전체 시간영역을 4단계로 나눈 경우에 최대치를 얻을 수 있었으며 동적최적화를 통하지 않은 다른 여러 경우와 비교하여 목적함수가 약 3.6-235% 가량 향상됨을 알 수 있었다. A mathematical model of a catalytic reactor system, which products phthalic anhydride from o-xylene, is constructed. Based an the mathematical model, dynamic optimisation of the system is carried out. The mathematical statement of the system is IPDAEs and they are converted into DAEs using, MOL. Within the framework of CVP, control variables can be, described in terms of a weighted combination of simple polynomials, and this leads an infinite dimensional dynamic optimisation problem to a finite dimensional NLP problem. The reformulated dynamic optimisation problem using CVP can be solved with repeated calculation of the NLP outer loop and the tune integration inner loop. Dynamic optimisation is carried out for various control strategies, and the results are compared. The maximum objective function is obtained for the 4 step strategy and we compare its results with intuitively chosen control cases. From the comparison, we noted that the objective function of the optimal case is improved about 3.6-235%.
Random Block-Based Video Watermarking of H.264/SVC
Won Jei Kim,Kwang-Seok Moon,MD Abul Bashar,Young-Ho Ahn,Suk-Hwan Lee,Yong-Su Seo,Ki-Ryong Kwon 한국멀티미디어학회 2008 한국멀티미디어학회 국제학술대회 Vol.2008 No.-
In this paper, we proposed random block-based video watermarking of H.264/SVC(scalable video coding). In proposed scheme, the embedding of watermark is performed in H.264/SVC encoder. Our scheme use the block that is decided by length of the watermark and size of the video frame. And then the block randomly selected by random position key. With the proposed method, the video watermarking scheme can achieve high robustness and good visual quality without increasing the overall bit-rate. Experimental results show that our scheme can robustly survive encoding, common signal processing and geometrical processing.