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Lee, Hong Jae,Kim, Sung Eun,Kwon, Il Keun,Park, Chiyoung,Kim, Chulhee,Yang, Jaemoon,Lee, Sang Cheon Royal Society of Chemistry 2010 Chemical communications Vol.46 No.3
<P>Polymer micelles with bioabsorbable mineralized calcium phosphate nanoshells have been synthesized and demonstrated to be robust nanocarriers for efficient intracellular drug delivery.</P> <P>Graphic Abstract</P><P>Formation of CaP nanoshells greatly enhanced the robustness of polymer micelles, and the dissolution of CaP nanoshells in lysosomal environments facilitated the release of entrapped anticancer drugs. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b913732g'> </P>
Lee, Chulhee,Kim, Kyudong,Lee, Hyuk-Jae Elsevier 2018 Displays Vol.55 No.-
<P><B>Abstract</B></P> <P>This paper presents a novel algorithm to classify complex-rendered text images by examining the color levels of the adjacent sub-pixels. The proposed algorithm is different from the previous approaches in that it uses the combined characteristics of RGB sub-channels, whereas the previous approaches use independent characteristics of RGB sub-channels. Experimental results demonstrate that the proposed algorithm improves the classification accuracy over the previous best algorithm by 15.9% for complex-rendered texts. Furthermore, the compression method optimized for text sub-images significantly reduces the computational complexity without degradation in compression efficiency.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This paper presents a novel algorithm to classify complex-rendered text images. </LI> <LI> The proposed algorithm uses the combined characteristics of RGB sub-channels. </LI> <LI> The classification accuracy is improved by 15.9% for complex-rendered texts. </LI> <LI> The computational complexity is reduced without compression efficiency degradation. </LI> </UL> </P>
Chulhee Lee,Chae Eun Rhee,Hyuk-Jae Lee Institute of Electrical and Electronics Engineers 2017 IEEE transactions on circuits and systems for vide Vol.27 No.10
<P>Scale-invariant feature transform (SIFT) is one of the most widely used local features for computer vision in mobile devices. A mobile graphic processing unit (GPU) is often used to run computer-vision applications using SIFT features, but the performance in such a case is not powerful enough to generate SIFT features in real time. This paper proposes an efficient scheme to optimize the SIFT algorithm for a mobile GPU. It analyzes the conventional scale-space construction step in the SIFT generation, finding that reducing the size of the Gaussian filter and the scale-space image leads to a significant speedup with only a slight degradation of the quality of the features. Based on this observation, the SIFT algorithm is modified and implemented for real-time execution. Additional optimization techniques are employed for a further speedup by efficiently utilizing both the CPU and the GPU in a mobile processor. The proposed SIFT generation scheme achieves a processing speed of 28.30 frames/s for an image with a resolution of 1280 x 720 running on a Galaxy S5 LTE-A device, thereby gaining a speedup by the factors of 114.78 and 4.53 over CPU-and GPU-only implementations, respectively.</P>
Changing Industrial Structure and Economic Activity of Older Males in Korea: 1980-2000
Chulhee Lee 서울대학교 경제연구소 2004 Seoul journal of economics Vol.17 No.2
This article examines how long-term changes in the industrial structure in Korea affected the economic activity of older males. The structural shift in industry between 1980 and 2000 greatly lowered the average labor market survival rate, a measure of employment stability, for male workers aged 55 and older. In particular, the relative decline of the agricultural sector fully explains the observed impact of the sectoral shift on the employment of the elderly. The labor force participation rate of older men would have been much higher if the percentage of the labor force employed in agriculture had remained unchanged since 1980. It is estimated that the shrinkage of agriculture explains 84% of the actual decline in the labor force participation rate of men aged 55 to 69 between 1985 and 2000. These results suggest that changing industrial structure, especially the decline in agriculture, could produce a further decline in the labor market activity of older men in the near future. It also points out the limitations of the recent government labor-market policies to boost the employment of older workers, because it is highly difficult, and sometimes undesirable, to alter the course of long-term structural economic changes that diminish the economic activity of the elderly.
Chulhee Lee 서울대학교 경제연구소 2002 Seoul journal of economics Vol.15 No.3
This study estimates the relative contribution of each of the components of household income, including labor supply, to the observed changes in household income inequality between 1988 and 1999. For the period 1988 to 1993, reduced inequality in the hourly wages of heads was the dominant cause of the improvement in the household income distribution. For the period 1997 to 1999, on the other hand, changes in other incomes, along with changes in the wages of heads, was an important contributor to the widening of the income disparity. Changing hours of heads was also a nontrivial factor, accounting for 15% of the rise in income in equality during the period. The relative contribution of changing labor supply to the rise in income inequality after 1997 might be much greater, if the effects of changing employment of heads could be considered.
Chulhee Lee 서울대학교 경제연구소 2000 Seoul journal of economics Vol.13 No.1
The labor force participation of older males in the United States started to decline in the late nineteenth century, long before the development of major public welfare programs for the elderly. Some scholars have attributed this phenomenon to the expansion of the Union army pension programs. This note suggests that the veterans' pension is of secondary importance in explaining the trend toward declining labor market activity of older males. This result implies that the labor force participation of older males would have declined over the last century even without the rise of public welfare and social insurance programs.
Lee, Shunhwa,Lee, Chulhee,Park, Yungkyu 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.18 No.1
Abstract The purpose of this study is to improve the quality of surface water treatment. It will compare the data from conventional water treatment processes with that of advanced water treatment processes at the pilot plant. The DOC and UV254 removal efficiencies were observed to be 53% and 77% after water was passed through the ozone and BAC processes. And in the case of THM and AOX concentrations, they were 19.9% and 10.4% removal by the ozone oxidation process. Another 53.6% and 24.6% were removal when water was passed through the BAC filtration process. The THM and AOX concentrations at the final effluent were observed to be 9.98 μg/L and 32.41 μg/L respectively. The influence of MW of organic materials was also considered. 44.4% of DOC in the large MW range(over 10K) was removed by the ozone process. But the concentration of DOC in the lower MW ranges increased after ozone treatment. The BAC process, however, removed 40% more DOC at the low MW range than did the ozone process.