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An Improved H.264 Encoded Algorithm Based on Weber-Fechner Law
Yanhui Xia,Baisheng Nie,Zhengyou Wang,Liying Li,Jianhua Ming,Zheng Wan,Shuying Huang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.9
With the study of human visual system (HVS), people find that the human eye shows different degree of sensitivity to different light signals. A higher background brightness region of the human eye for the distortion, the degree of sensitivity will be greatly reduced. The human eye’s sensitivity will be greatly reduced to the distortion of a higher brightness background region. This finding is discribed in Weber-Fechner law. Therefore, the encoder can be improved by employing this characteristic of human visual system. In this paper, the authors use this characteristic to improve the H.264 video coding algorithm. In order to improve the compression efficiency of encoder, give the brightness of different regions with different levels of quantification by adjusting the quantization step size (QP), without affecting the subjective quality of video. Experimental results show that the output bit rate decrease up to 10% -20% by using this improved algorithm in H.264 reference encoder, and the subjective quality of decoded image by using this improved algorithm is as good as the standard H.264 encoders.
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Study of A MEMS Gyroscope Sensing Unit Simulate and Process
Yu Liu,Baisheng Sun,Ping Yue,Qinwen Yan,Fuxue Zhang 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper reports a MEMS gyroscope that is driven by the rotating carrier’s angular velocity. The structure and fabrication are introduced in the paper. The silicon processing and simulating of the sensing unit are studied. We use coventor ware to simulate structure. And in process, we use spray coating instead of spinning coating. In simulation, the first modal frequency we obtained is 220.38Hz, it is nearly we calculated. A conformal resist of 3μm thickness is obtained at 35mm Z-height, 100mm/min travel rate, 3ml/min flow rate. In step surface coating it gets more uniform thickness that associates with line width, a better line width would get a more precise pattern. Thus, it provides an opportunity of a precision patterning on a wafer.
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An efficient approach to structural static reanalysis with added support constraints
Haifeng Liu,Baisheng Wu,Zhengguang Li 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.43 No.3
Structural reanalysis is frequently used to reduce the computational cost during the process of design or optimization. The supports can be regarded as the design variables in various types of structural optimization problems. The location, number, and type of supports may be varied in order to yield a more effective design. The paper is focused on structural static reanalysis problem with added supports where some node displacements along axes of the global coordinate system are specified. A new approach is proposed and exact solutions can be provided by the approach. Thus, it belongs to the direct reanalysis methods. The information from the initial analysis has been fully exploited. Numerical examples show that the exact results can be achieved and the computational time can be significantly reduced by the proposed method.
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Kim, Seonghak,Yan, Baisheng IOP 2018 Nonlinearity Vol.31 No.6
<P>We study some non-parabolic diffusion problems in one space dimension, where the diffusion flux exhibits forward and backward nature of the Perona–Malik, Höllig or non-Fourier type. Classical weak solutions to such problems are constructed in a way to capture some expected and unexpected properties, including anomalous asymptotic behaviors and energy dissipation or allocation. Specific properties of solutions will depend on the type of the diffusion flux, but the primary method of our study relies on reformulating diffusion equations involved as an inhomogeneous partial differential inclusion and on constructing solutions from the differential inclusion by a combination of the convex integration and Baire’s category methods. In doing so, we introduce the appropriate notion of subsolutions of the partial differential inclusion and their transition gauge, which plays a pivotal role in dealing with some specific features of the constructed weak solutions.</P>
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An efficient approach to structural static reanalysis with added support constraints
Liu, Haifeng,Wu, Baisheng,Li, Zhengguang Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.43 No.3
Structural reanalysis is frequently used to reduce the computational cost during the process of design or optimization. The supports can be regarded as the design variables in various types of structural optimization problems. The location, number, and type of supports may be varied in order to yield a more effective design. The paper is focused on structural static reanalysis problem with added supports where some node displacements along axes of the global coordinate system are specified. A new approach is proposed and exact solutions can be provided by the approach. Thus, it belongs to the direct reanalysis methods. The information from the initial analysis has been fully exploited. Numerical examples show that the exact results can be achieved and the computational time can be significantly reduced by the proposed method.
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Enhance photoelectric efficiency of PV by optical-thermal management of nanofilm reflector
Liang, Huaxu,Wang, Baisheng,Su, Ronghua,Zhang, Ao,Wang, Fuqiang,Shuai, Yong Techno-Press 2022 Advances in nano research Vol.13 No.5
Crystalline silicon photovoltaic cells have advantages of zero pollution, large scale and high reliability. A major challenge is that sunlight wavelength with photon energy lower than semiconductor band gap is converted into heat and increase its temperature and reduce its conversion efficiency. Traditional cooling PV method is using water flowing below the modules to cool down PV temperature. In this paper, the idea is proposed to reduce the temperature of the module and improve the energy conversion efficiency of the module through the modulation of the solar spectrum. A spectrally selective nanofilm reflector located directly on the surface of PV is designed, which can reflect sunlight wavelength with low photon energy, and even enhance absorption of sunlight wavelength with high photon energy. The results indicate that nanofilm reflector can reduce spectral reflectivity integral from 9.0% to 6.93% in 400~1100 nm wavelength range, and improve spectral reflectivity integral from 23.1% to 78.34% in long wavelength range. The nanofilm reflector can reduce temperature of PV by 4.51℃ and relatively improved energy conversion efficiency of PV by 1.25% when solar irradiance is 1000 W/m<sup>2</sup>. Furthermore, the nanofilm reflector is insensitive in sunlight's angle and polarization state, and be suitable for high irradiance environment.
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