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TiO2/UV-A 시스템을 이용한 Cu(2)-EDTA의 광촉매 산화반응에서 TiO2 재사용 및 회수
이승목 ( Seung Mok Lee ) 한국물환경학회 2005 한국물환경학회지 Vol.21 No.1
TiO₂-catalyst suspensions work efficiently in Photocatalytic oxidation (PCO) for wastewater treatment. Nevertheless, once photocatalysis is completed, separation of the catalyst from solution becomes the main problem. The PCO of Cu(Ⅱ)-EDTA was studied to determine the reusability of the titanium dioxide catalyst. Aqueous solutions of 10^(-4)M Cu(Ⅱ)-EDTA were treated using illuminated TiO₂ particles at pH 6 in a circulating reactor. TiO₂ was reused in PCO system for treatment or Cu(Ⅱ)-EDTA comparing two procedures: reuse of water and TiO₂ and reuse of the entire suspension after PCO of Cu(Ⅱ)-EDTA. The results are as follows; (ⅰ) Photocatalytic efficiency worsens with successive runs when catalyst and water are reused without separation and filtration, whereas, when TiO₂ is separated from water, the reused TiO₂ is not deactivated. (ⅱ) The TiO₂ mean recovery (%) with reused TiO₂ was 86.4%(1.73g/L). Although the mean initial degradation rate of Cu(Ⅱ)-EDTA and Cu(Ⅱ) was lower than that using fresh TiO₂, there was no significant change in the rate during the course of the three-trial experiment. It is suggested that Cu(Ⅱ)-EDTA could be effectively treated using an recycling procedure of PCO and catalyst recovery. (ⅲ) However, without TiO₂ separation, the loss of efficiency of the PCO in the use of water and TiO₂ due to Cu(Ⅱ), DOC remained from previous degradation and Cu(Ⅱ)-EDTA added to the same suspension was observed after 2 trials, and resulted in the inhibition of the Cu(Ⅱ)-EDTA, Cu(Ⅱ) and DOC destruction.
이승목(Seung-Mok Lee),임재권(Jae-Kwon Eem) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.10
In this paper, we propose a computational method of circular cross correlation for images with large difference of size. In case of expressing a 2D representation for each pixel value of the image with extending Fourier series, the 2D representation of zero-padded image have a positive sign tendency because the image consists of positive pixel values. Using this tendency, proposed method presents a fast computation for circular cross correlation. Recently, larger size images are handled by the demands for high quality images and fast algorithms are required necessarily for these images. And many researchers studied in the MARS (multimedia archive retrieval system) and video-on-demand. Proposed method could be used to find matched images among those images. Experiments are carried out for various images and we show the computational results and its corresponding differences.
계층적 푸리에 상관과 신뢰 전파를 이용한 스테레오 매칭
이승목(Seung-Mok Lee),임재권(Jae-Kwon Eem) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.3
For the dense stereo correspondence problem, we propose an algorithm using hierarchical Fourier correlations as a complementary parameter. Proposed hierarchical Fourier correlations are calculated by using range-reduced DFTs(discrete Fourier transforms) and these normalized cross-correlations. In MRF(Markov random field) model as energy-minimization problem, the normalized correlation is added to a part of the term of data cost in energy function. Then a better disparity map is obtained using energy minimization by BP(belief propagation). The performances are evaluated by RMS(root mean squared) error and percentage of bad matching pixels based on given GT(ground truth) data. Our experiments is implemented for stereo images and shows advantages of newly added term with the number of iterations. For real-time stereo systems, the proposed method can be implemented using FFT algorithm.
계층적 푸리에 상관과 적응적 영역 가중치를 이용한 스테레오 매칭
이승목(Seung-Mok Lee),임재권(Jae-Kwon Eem) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.4
For obtaining a dense disparity map of stereo matching, we propose an algorithm using hierarchical Fourier correlations and ASW(adaptive support-weight). The hierarchical Fourier correlations are obtained using cross-correlation of range-reduced DFTs(discrete Fourier transforms) in hierarchical layers. The ASW technique is used as a robust local matching method for computing matching costs with intensities of the stereo images. Evaluations are performed on the disparity map obtained using the cost volume and WTA(winner-take-all) algorithm. The performances are calculated dependent on window size of the ASW method. Experiments for performance evaluation are also conducted on the disparity refinement using a small size median filter.
3D 프린터 플랫폼을 이용한 G 코드 기반 드립 방식의 2중 온수 가열기를 가진 커피 드립 머신 구현
이승목(Seung-Mok Lee),최운하(Un-Ha Choi),김영형(Young-Hyung Kim),김상희(Sang-Hee Kim),임재권(Jae-Kwon Eem) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.12
This paper shows an implementation of coffee drip-machine as a practical purpose of 3D printing technique. Recently 3D printing techniques have improved and developed continuously and it can be one of the important techniques of the development of commercial products. Brew coffee is a cup of coffee dropped by a trained barista who has the coffee brewing skills and the knowledge of the drip brew. For the drip brew of the barista in coffee-services, our machine is implemented to a part of drip-methods using 3D printing techniques. The G-code based drip methods are implemented by 3D printer platform, and hot-water is supplied by an instant heating module and a temperature controller. Our implementation shows a way of practical implementation of 3D printing technique and also proposes drip-methods for a variety of drip-coffee products.
이승목(Seung-Mok Lee),임재권(Jae-Kwon Eem) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.12
In this paper, we propose a stereo matching algorithm using hierarchical Fourier correlations for stereo correspondence problem. Proposed algorithm shows a range-reduced DFT of divided real-valued data sequence, a correlation of these DFTs, and a block correlation image. For a dense stereo matching, the correlation volume space can be calculated using block correlations and matching costs of block matching together. The disparity map is also obtained by using WTA(winner-take-all) algorithm and SMF(selective mode filter). Performance of the proposed method is evaluated by RMS(root mean squared) error and BP(percentage of bad matching pixels) based on GT(ground truth) data. Experiments are conducted on several stereo images and show a kind of complementary relation between matching costs of block matching and the Fourier correlations. The proposed method could be implemented for real-time stereo system using FFT.