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- 저자 : ( Shaohui Sun ) (검색결과 3 건)
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Optimization Algorithm Based on Laplacian Location and Extension Grid
Shaohui Ma,Xinling Sun,Benzhai Hai,Xie Rui-yun 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.9
This article put forward an optimization algorithm of triangle grid model based on Laplacian coordinate constraint and a fast reconstruction algorithm of model topology structure based on STL file, such methods may enhance the quality of triangular patch as well as splendidly remain local geometric features of original grid model. The character of it is there’s unnecessary to distinguish constraint vertex and free vertex no longer and to carry on a double restraints to location and Laplacian coordinate for all vertex, then solve a linear system, which contains double restraint, with least-squares sense to carry on an relocation for all vertex. The experimental results showed that proposed algorithm is provided with a certain advantage in terms of detail features of grid compared with precedent Laplacian optimization algorithm.
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Research on Per-cell Codebook based Channel Quantization for CoMP Transmission
( Zhirui Hu ),( Chunyan Feng ),( Tiankui Zhang ),( Qiubin Gao ),( Shaohui Sun ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.6
Coordinated multi-point (CoMP) transmission has been regarded as a potential technology for LTE-Advanced. In frequency division duplexing systems, channel quantization is applied for reporting channel state information (CSI). Considering the dynamic number of cooperation base stations (BSs), asymmetry feature of CoMP channels and high searching complexity, simply increasing the size of the codebook used in traditional multiple antenna systems to quantize the global CSI of CoMP systems directly is infeasible. Per-cell codebook based channel quantization to quantize local CSI for each BS separately is an effective method. In this paper, the theoretical upper bounds of system throughput are derived for two codeword selection schemes, independent codeword selection (ICS) and joint codeword selection (JCS), respectively. The feedback overhead and selection complexity of these two schemes are analyzed. In the simulation, the system throughput of ICS and JCS is compared. Both analysis and simulation results show that JCS has a better tradeoff between system throughput and feedback overhead. The ICS has obvious advantage in complexity, but it needs additional phase information (PI) feedback for obtaining the approximate system throughput with JCS. Under the same number of feedback bits constraint, allocating the number of bits for channel direction information (CDI) and PI quantization can increase the system throughput, but ICS is still inferior to JCS. Based on theoretical analysis and simulation results, some recommendations are given with regard to the application of each scheme respectively.
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A self-powered β-Ga2O3/CsCu2I3 heterojunction photodiode responding to deep ultraviolet irradiation
Gao Ang,Jiang Weiyu,Ma Guoliang,Liu Zeng,Li Shan,Yan Zuyong,Sun Weiming,Zhang Shaohui,Tang Weihua 한국물리학회 2022 Current Applied Physics Vol.33 No.-
In this paper, a lead-free halide perovskite CsCu2I3 film with high stability was prepared by the anti-solvent assisted crystallization method. Then, we coupled it with Ga2O3 to prepare a corresponding heterojunction deep ultraviolet (UV) photodetector. After testing, we concluded that the photodetector is sensitive to 254 nm UV light. The photodetector has good reproducibility, and has an ultra-high photo-to-dark current ratio (PDCR) of more than 105. In addition, under a bias of 10 V and an illuminated intensity of 200 μW/cm2, the responsivity (R) and specific detectivity (D*) reached 20 mA/W and 107 cm Hz1/2 W 1 (Jones), and the external quantum efficiency (EQE) is 10%. Meanwhile, the prepared photodetector could operate at zero bias, i.e., self-powered operation, along with a photocurrent of about 1 nA under illumination with UV light intensity of 200 μW/cm2.
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