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Manifold Sparse Coding Based Hyperspectral Image Classification
Yanbin Peng,Zhijun Zheng,Jiming Li,Zhigang Pan,Xiaoyong Li,Zhinian Zhai 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.12
Hyperspectral image classification has received an increasing amount of interest in recent years. However, when representing pixels as vectors, the dimensionality of feature space is high, which causes “curse of dimensionality” problem. In this paper, in order to alleviate the impact of above problem, a manifold sparse coding method is proposed. Firstly, matrix decomposition technique is used to find a concept set and calculates relative data projection in the concept set. Secondly, manifold learning regularization is imported into objective function to capture the intrinsic geometric structure in the data. Finally, LASSO regularization is used to obtain sparse representation of data projection. Experimental results on real hyperspectral image show that the proposed method has better performance than the other state-of-the-art methods.
Predicting the Weed Control Efficacy of Photosynthesis Inhibitors by PPM Method
HONGJUN ZHANG,HAILAN CUI,JIMING YE,XUE LIU,XIANGJUN LI,CORNE KEMPENAAR,SHOUHUI WEI,HANWEN NI 韓國雜草學會 2009 Weed&Turfgrass Science Vol.29 No.3
The experiment was conducted in a greenhouse in Beijing, China, to determine whether weed control efficacy could be predicted based on Plant Photosynthesis Meter (PPM) values measured shortly after the application of photosynthesis inhibitors. The decrease of PPM values of the weed leaves treated with the mixture of atrazine and bentazone could be measured 1 day after treatment (DAT). The decreased extents depended on weed susceptibility and application dosage. There was significant correlation between the PPM values of the treated leaves 1 to 3 DAT and the biomass reduction 14 DAT. The experimental findings indicated that PPM values measured in early days after treatment could give reasonable prediction on weed control. The herbicide usually provided 90% control by weed biomass when PPM value was about 20 and relatively poor control when PPM value over 20.
Dewang Kong,Min Zhao,Shikuo Li,Fangzhi Huang,Jiming Song,Yupeng Yuan,YUHUA SHEN,ANJIAN XIE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.1
In this paper, a facile and efficient method combined sol–gel method with hydrothermal process was employed for preparing titanium dioxide (TiO2/reduced graphene oxide (rGO) nanocomposites without using any reductants or surfactants. This approach leads to the reduction of graphene oxide (GO) and the growth of TiO2 nanorods simultaneously. The results reveal that the TiO2 short nanorods with average size of 15 nm in length and 10 nm in diameter were uniformly grown on the rGO sheets with high dispersion. Compared with the pure TiO2 nanoparticles, the TiO2/rGO composites exhibit strong absorption in the visible light range. The photocurrent density of nanocomposites reached 0.826 mA/cm2 under the simulated sunlight illumination, which is 3.5 times than that of pure TiO2. An enhancement of photocatalytic hydrogen formation rate for the water splitting was observed over the TiO2/rGO composite photocatalysts, the fastest formation rate can reach 889.28 µmol·g-1·h-1 when TiO2 coupling with 1wt.% rGO. Also the hydrogen production rate is about 3.27 times larger than pure TiO2 and 2.23 times than P25 due to the excellent electron trapping and transportation properties of rGO and the synergistic effect between TiO2 and rGO.
Xinliang Zheng,Juan Feng,Jiarui Zhang,Hongna Xing,Jiming Zheng,Mingzi Wang,Yan Zong,Jintao Bai,Xinghua Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.3
High-quality neodymium oxychlorides nanocrystals with cubic shape were synthesized by a nonhydrolytic thermolysis route. The morphology and crystal structure of the neodymium oxychlorides nanocubes were characterized by transmission electron microscopy at the nanoscale. Transmission electron microscope (TEM) image shows that the neodymium oxychlorides nanocrystals are nearly monodispersed with cube-like shape. X-ray diffraction (XRD) and selected area electron diffraction (SAED) patterns of numerous neodymium oxychlorides nanocubes suggest a pure crystal phase with tetragonal PbFCl matlockite structure. HRTEM image of individual neodymium oxychlorides nanocubes indicate that each nanocubes have a singlecrystalline nature with high quality. Unlike the anti-ferromagnetism of the bulk, the neodymium oxychlorides nanocubes show clearly anomalous ferromagnetic characteristic at room temperature. This finding provides a new platform for the exploration of diluted magnetic semiconductors, rare earth-based nanomaterials and so on.