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	Parameter optimization of passive dynamic walking biped with knees (EI CONFERENCE) 会议论文 OAI收割 2012 2nd International Conference on Materials Science and Information Technology, MSIT 2012, August 24, 2012 - August 26, 2012, Xi'an, Shaan, China 作者: Zhang P. 收藏 \| 浏览/下载：21/0 \| 提交时间：2013/03/25 A method to find the optimized parameter values of passive dynamic walking biped is presented. The effects of biped physical parameters on the stability property of passive gaits are studied by simulation experiments. The chosen parameters include the mass distribution length of leg and slope angle. The stability property of passive walking limit cycles is used as criterion of optimization calculation including the orbital stability described by eigen-values of linearized Poincare map and the global property described by size of attraction region. The simulation results show how the stability of limit cycle varies when physical parameters of the passive biped change. The work is useful to explore the inherent property of passive dynamic walking and can be used as an important instruction in the mechanical design of biped robots based on principle of passive dynamic walking. (2012) Trans Tech Publications Switzerland.
	Space camera dynamic image quality measurement and evaluation (EI CONFERENCE) 会议论文 OAI收割 3rd International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2011, January 6, 2011 - January 7, 2011, Shanghai, China 作者: Zhang X.; Zhang X.; Zhang X. 收藏 \| 浏览/下载：20/0 \| 提交时间：2013/03/25 By using analysis of the infinity image of the space camera we intend to obtain the curve of the dynamic modulation transfer function. We extract the pixel gray values at the image edge which distribute as a knife-edge function and make differential calculation and Fourier transformation of it and then we can obtain the dynamic MTF curve of the optical system. The value of the curve at the Nyquist frequency is the most important parameter that reflects the image quality. We add push-scanning imaging and environmental effects to the static MTF of space camera and compare the MTF value with the dynamic MTF at Nyquist frequency. The comparison result can help us verify the accuracy of the calculating results and the feasibility of our method. (2011) Trans Tech Publications.
	High resolution gray-scale modulation method based on linear superposition for LED displays (EI CONFERENCE) 会议论文 OAI收割 2011 International Conference on Control, Automation and Systems Engineering, CASE 2011, July 30, 2011 - July 31, 2011, Singapore, Singapore Feng Y.; Xu X.; Miao C.; Ding T. 收藏 \| 浏览/下载：11/0 \| 提交时间：2013/03/25 This paper proceeds a new method for gray-scale modulation has a deep research on weighted linear superposition principle of pulse width sequences builds a basic equation of scanning drive analyzes constraint relations between compound modes of pulse sequences and gray-scale resolution pixel driving efficiency data shifting clock and refresh rate etc and optimal methods and lists parameter optimal values in different scanning ways according to real needs of LED displays resulting in realization of gray-scale modulation in 14bit to 18 bit resolution. 2011 IEEE.
	Comparing early outbreak detection algorithms based on their optimized parameter values 期刊论文 OAI收割 JOURNAL OF BIOMEDICAL INFORMATICS, 2010, 卷号: 43, 期号: 1, 页码: 97-103 作者: Wang, Xiaoli; Zeng, Daniel; Seale, Holly; Li, Su; Cheng, He 收藏 \| 浏览/下载：19/0 \| 提交时间：2015/08/12 Outbreak detection algorithms Evaluation Parameter values Outbreak simulation