中国科学院机构知识库网格系统: 检索

Petascale molecular dynamics simulation of crystalline silicon on Tianhe-1A 会议论文 OAI收割
作者: Hou, Chaofeng; Xu, Ji; Wang, Peng; Huang, Wenlai; Wang, Xiaowei

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收藏 | 浏览/下载：0/0 | 提交时间：2023/06/16

Computer graphics equipment - Surface reactions - Program processors - Molecular dynamics - Reaction kinetics - Digital arithmetic - Silicon - Crystalline materials - Image coding - Computer graphics - Surface defects - Grain boundaries

LABTM control system based on FPGA (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Mechatronics and Applied Mechanics, ICMAM 2012, December 8, 2012 - December 9, 2012, Taiwan
作者: Wang Y.; Yu P.; Yu P.; Wang Y.; Wang Y.

收藏 | 浏览/下载：153/0 | 提交时间：2013/03/25

This paper presents the digital PI control method for design and simulation of a high precision limited angle brushless torque motor control system in Field Programmable Gate Array device (FPGA). The direct drive structures which are widely applied in many servo control fields. Matlab Xilinx System GeneratorR toolbox based on Fixed-Point Arithmetic is used to design the digital PI controller using DSP architecture plot the responses of the control system and generate the VHDL source code. The control system model consists of a digital PI a real LABTM and a real absolute Inductosyn encoder to rpm and position blocks. Through loading generated codes in process of the simulation that built by the digital discrete model it is verified that the rising time of current loop is only 1.2ms and rate loop is 8ms overshoot is rarely 4.2%. Finally the comprehensive positioning accuracy of system can reach up to 5 arc sec and the rate jitter achieves 5% with the 4 arc sec accuracy absolute Inductosyn. (2013) Trans Tech Publications Switzerland.

The research of digltal CR medicine image adapitive enhancement method (EI CONFERENCE) 会议论文 OAI收割
4th International Conference on Mechanical and Electrical Technology, ICMET 2012, July 24, 2012 - July 26, 2012, Kuala Lumpur, Malaysia
Ming-Hui Z.; Yao-Yu Z.

收藏 | 浏览/下载：65/0 | 提交时间：2013/03/25

Digital CR medicine radiation image is in doctor's favor and has became medicine imaging technology new hot spot because of its high gray contrast powerful computer disposal function little radiation dosage non-film diagnosis different area consultation. But degradation of digital X-ray medical image such as low contrast and blurring during radiographic imaging caused by complexity of body tissue and effects of X-ray scattering and electrical noise etc. can worsen the results of analysis and diagnosis. So it is usually needed that CR medicine image is enhanced to improve its vision quality and easy to doctor's more accurate diagnosis. The general enhancement algorithms over enhancing the contrast and lose image details aiming at the defects an enhancement algorithm for CR image is proposed based on the ratio of deviation to mean of domain. The arithmetic enhance CR image edge details by adjusting factor K based on the ratio of deviation to mean of domain of CR image. Experiment results demonstrate that the algorithm enhances CR image detail and CR image enhanced has good visual effect the adaptive enhancement method is fit for CR medicine image. (2012) Trans Tech Publications Switzerland.

The design problems of one kind of chaotic one-way hash function (EI CONFERENCE) 会议论文 OAI收割
2012 4th International Conference on Multimedia and Security, MINES 2012, November 2, 2012 - November 4, 2012, Nanjing, Jiangsu, China
Li P.; Zhang M.; Shi J.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

The construction method of one kind of one-way hash function based on 1-D Logistic map is analyzed. The design problem and some collision problems are pointed out. By using the dictionary attack the collision probability of the arithmetic realized with signal floating point numbers is 2-23 and the collision probability of the arithmetic realized with double floating point numbers is 2-55. The reasons for these design problems are discussed and some key problems are pointed out which should be taken care of while constructing one-way hash function based on a digital chaotic map. 2012 IEEE.

Research on model reference sliding mode control in roll stabilization of aerocraft (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Chu H.-R.

收藏 | 浏览/下载：40/0 | 提交时间：2013/03/25

Aimed at aerospace roll stabilization control arithmetic based on model reference sliding mode variable structure theory and chattering reduction arithmetic are formulated. Correctness and validity of arithmetic are analyzed. With flight dynamics the roll-loop mathematic model and reference model are established. Sliding hyperplane is deduced based on model reference sliding mode variable structure theory. Combing with reaching law control law is derived and stability of roll-loop is analyzed. Chattering of aileron instructions is alleviate by using boundary layer approach. Digital flying simulation result shows that variable structure control arithmetic realized roll stabilization control the roll angle is less than 5.3 under powered flight and that of unpowered flight is less than 0.5 respectively. The command fin angle is less than 1.5. High frequency chattering of fin command nearby the minimum velocity was trailed off by chattering reduction arithmetic. The sliding mode control arithmetic show good performance when aerodynamic coefficients varies 20%. The control arithmetic is easy to be implemented for its simplicity. 2011 IEEE.

Compact non-binary fast adders using single-electron devices 期刊论文 iSwitch采集
Microelectronics journal, 2009, 卷号: 40, 期号: 8, 页码: 1244-1254
作者: Zhang, Wancheng; Wu, Nan-Jian

收藏 | 浏览/下载：26/0 | 提交时间：2019/05/12

Fast adder Non-binary arithmetic Counter tree diagram Single-electron devices Signed-digital-adder

Real-time motive vehicle detection with adaptive background updating model and HSV colour space (EI CONFERENCE) 会议论文 OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China
Rong-Hui Z.; Bai Y.; Hong-guang J.; Chen T.

收藏 | 浏览/下载：67/0 | 提交时间：2013/03/25

In the transportation monitor system we set up the area of interest (AOI) of the vehicle model and adjust the size of AOI dynamically in order to track vehicle accurately. The results of experiment show that motive vehicle detection by adopting digital image is one of key technologies. To detect motive vehicle accurately the arithmetic proposed in the paper can suppress shadow availably we establish an adaptive background updating model firstly. Noise is suppressed by using modality filter detect motive vehicle accurately and satisfy real-time motive vehicle tracking. 2009 SPIE. and we obtain binary image by using maximum entropy to choose dynamic adaptive threshold. Based on positive information of shadow and aspect feature of motive vehicle we adopt HSV colour space and double threshold to solve the problem of vehicle shadow. According to prediction result of Kalman filtering

Compact non-binary fast adders using single-electron devices 期刊论文 OAI收割
microelectronics journal, 2009, 卷号: 40, 期号: 8, 页码: 1244-1254
Zhang WC; Wu NJ

收藏 | 浏览/下载：122/21 | 提交时间：2010/03/08

Fast adder Non-binary arithmetic Counter tree diagram Single-electron devices Signed-digital-adder

smt-based bounded model checking for real-time systems 会议论文 OAI收割
8th International Conference on Quality Software, Oxford, ENGLAND, AUG 12-13,
Xu Liang

收藏 | 浏览/下载：65/3 | 提交时间：2011/06/13

Chlorine compounds Digital arithmetic Model checking Speech transmission Surface mount technology

dynamic noise texture generation on fpgas 会议论文 OAI收割
2005 International Conference on Communications, Circuits and Systems, Hong Kong, China, 43978
Li Xiaoying; Wu Enhua

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收藏 | 浏览/下载：31/0 | 提交时间：2011/07/28

Computational methods Digital arithmetic Functions Software prototyping Textures