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12-year LIDAR Observations of Tropospheric Aerosol over Hefei (31.9°N, 117.2°E), China
Decheng Wu,Jun Zhou,Dong Liu,Zhenzhu Wang,Zhiqing Zhong,Chen-Bo Xie,Fudi Qi,Aiyuan Fan,Yingjian Wang 한국광학회 2011 Current Optics and Photonics Vol.15 No.1
12-year LIDAR observations of tropospheric aerosol vertical distribution using a Mie scattering LIDAR in Hefei (31.9°N, 117.2°E) from 1998 to 2009 are presented and analyzed in this paper. Characters of temporal variation and vertical distribution of tropospheric aerosol over Hefei are summarized from the LIDAR measurements. The impacts of natural source and human activities on the aerosol vertical distribution over Hefei could be seen clearly. Dust particles from the north in spring could affect the aerosol distributions below about 12 km over Hefei, and aerosol scale height in April reaches 2.29±0.68 km. Both LIDAR measurements and surface visibility imply that aerosols in the lower troposphere have been increasing since about 2005.
A CMOS Dual-mode High-dynamic-range Wideband Receiver RF Front-end
Changchun Zhang,Yingjian Wu,Peng Zhang,Ying Zhang,Jie Liu,Sung Min Park 대한전자공학회 2018 Journal of semiconductor technology and science Vol.18 No.5
A dual-mode wideband high-dynamic-range receiver RF front-end consisting mainly of a low-noise amplifier (LNA) and a mixer is presented and implemented in standard 0.18 μm CMOS technology. Besides wideband input matching, the wideband LNA is optimized purposefully for low NF and high gain, and the mixer for high linearity and proper gain. In high-gain (HG) mode, with the LNA involved, the high sensitivity can be achieved; in low-gain (LG) mode, with the LNA bypassed, the mixer stands out and makes the front-end exhibit high linearity. In an overall view, the proposed dual-mode wideband RF front-end achieves a high dynamic range. With an occupied die area of 2360 μm× 1460 μm and a single supply voltage of 1.8V, measurement results show the dual-mode RF frontend can operate across the desired frequency range of 1.3 ~ 2 GHz and achieve gain of 20 dB and NF of 4.8dB in the HG mode, and average IIP3 of 8 dBm and P1dB of -4 dB in the LG mode, respectively.
Hole-filling Based on Disparity Map for DIBR
( Ran Liu ),( Hui Xie ),( Fengchun Tian ),( Yingjian Wu ),( Guoqin Tai ),( Yingchun Tan ),( Weimin Tan ),( Bole Li ),( Hengxin Chen ),( Liang Ge ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.10
Due to sharp depth transition, big holes may be found in the novel view that is synthesized by depth-image-based rendering (DIBR). A hole-filling method based on disparity map is proposed. One important aspect of the method is that the disparity map of destination image is used for hole-filling, instead of the depth image of reference image. Firstly, the big hole detection based on disparity map is conducted, and the start point and the end point of the hole are recorded. Then foreground pixels and background pixels are distinguished for hole-dilating according to disparity map, so that areas with matching errors can be determined and eliminated. In addition, parallaxes of pixels in the area with holes and matching errors are changed to new values. Finally, holes are filled with background pixels from reference image according to these new parallaxes. Experimental results show that the quality of the new view after hole-filling is quite well; and geometric distortions are avoided in destination image, in contrast to the virtual view generated by depth-smoothing methods and image inpainting methods. Moreover, this method is easy for hardware implementation.