中国科学院机构知识库网格系统: 检索

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.

Systemic model for software cost analyzing and optimizing (EI CONFERENCE) 会议论文 OAI收割
2011 IEEE 3rd International Conference on Communication Software and Networks, ICCSN 2011, May 27, 2011 - May 29, 2011, Xi'an, China
作者: Zhanglei; Zhanglei

收藏 | 浏览/下载：60/0 | 提交时间：2013/03/25

Constructing low cost software is the main method to save energy source in computer science. Traditional research about software cost is only in one level. They are partial in some degree. To settle the problem a systemic model for software cost analyzing and optimizing is proposed in this paper. In this systemic model software cost analyzing and optimizing are from low level to high level. It can provide all-sided analyzing and optimizing in instruction source code level and structure level. Some suggestions and methods are given in each level to enrich the model. The systemic model expresses a new point of view in software cost. 2011 IEEE.

Improved algorithm of LED display image based on composed correction (EI CONFERENCE) 会议论文 OAI收割
International Conference on Advances in Computer Science, Environment, Ecoinformatics, and Education, CSEE 2011, August 21, 2011 - August 22, 2011, Wuhan, China
Song X.-J.; Ma X.-Q.; Liu W.-Y.; Zheng X.-F.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

In order to enhance the display result of the LED display image an improved algorithm of LED display image based on composed correction is proposed. Firstly the correction principle and the development status of the current correction technologies of the LED display image is introduced and the two main correction technologies are analyzed. Secondly the theory of composed correction is proposed by constructing a mathematical model. Thirdly this algorithm is achieved in VHDL which is one of hardware description language and verified in an experimental platform. Experimental results show that this algorithm is able to enhance the display result of the LED display image significantly. 2011 Springer-Verlag Berlin Heidelberg.

Development of highway constructing technology in the permafrost region on the Qinghai-Tibet plateau 期刊论文 iSwitch采集
SCIENCE IN CHINA SERIES E-TECHNOLOGICAL SCIENCES, 2009, 卷号: 52, 期号: 2, 页码: 497-506
作者: Wang ShuangJie; Chen JianBing; Zhang JinZhao; Li ZhuLong

收藏 | 浏览/下载：24/0 | 提交时间：2019/10/08

road engineering permafrost constructing technology research

A MLP-PNN neural network for CCD image super-resolution in wavelet packet domain (EI CONFERENCE) 会议论文 OAI收割
2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008, October 12, 2008 - October 14, 2008, Dalian, China
Zhao X.; Fu D.; Zhai L.

收藏 | 浏览/下载：68/0 | 提交时间：2013/03/25

Image super-resolution methods process an input image sequence of a scene to obtain a still image with increased resolution. Classical approaches to this problem involve complex iterative minimization procedures typically with high computational costs. In this paper is proposed a novel algorithm for super-resolution that enables a substantial decrease in computer load. First decompose and reconstruct the image by wavelet packet. Before constructing the image use neural network in place of other rebuilding method to reconstruct the coefficients in the wavelet packet domain. Second probabilistic neural network architecture is used to perform a scattered-point interpolation of the image sequence data in the wavelet packet domain. The network kernel function is optimally determined for this problem by a MLP-PNN (Multi Layer Perceptron - Probabilistic Neural Network) trained on synthetic data. Network parameters dependent on the sequence noise level. This super-sampled image is spatially Altered to correct finite pixel size effects to yield the final high-resolution estimate. This method can decrease the calculation cost and get perfect PSNR. Results are presented showing the quality of the proposed method. 2008 IEEE.

Based on Householder transform of the Zernike polynomial wave front fitting method to solve active optics correction force (EI CONFERENCE) 会议论文 OAI收割
Infrared Materials, Devices, and Applications, November 12, 2007 - November 15, 2007, Beijing, China
作者: Wu X.-X.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

Corrective force solving is a critical technology of the active optics. A method to solve active optics corrective force is introduced which is based on Householder transform of Zernike polynomial wave front fitting this method is different from the traditional least square method and Gram-Schmid orthogonal method because it does not bring ill-conditioned polynomial without constructing normal equation so it can avoid calculation error wave front fitting is precision. Based on the coefficient of the Zernike polynomial and the response function of the each actuator the stiffness matrix of the primary mirror is built and then adopting the damp least square method to calculate corrective force. Based on this method cp400m test mirror is simulated many times the calculation result approve: if the Householder transform is adopted wave front fitting is precision the result is stabilization and corrective effectiveness is better.

Abrupt sensor fault diagnosis based on wavelet network (EI CONFERENCE) 会议论文 OAI收割
2006 IEEE International Conference on Information Acquisition, ICIA 2006, August 20, 2006 - August 23, 2006, Weihai, Shandong, China
作者: Li W.; Li W.; Zhang H.; Zhang H.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

The possible faults of a sensor may be classified as abrupt (sudden) faults and incipient (slowly developing) faults. This paper focuses on the abrupt faults of a sensor. Due to the limited number of scales a single wavelet amplitude map has not enough scales to describe all details of the signal. The sampling grid in the scale direction is rather sparse Some of the fault information will be leaked under such sparse grid. To make up for the deficiency of scalar orthogonal wavelet transform in the application of abrupt fault diagnosis multiwavelet packets transform was introduced into the field of abrupt fault diagnosis. The distribution differences of the signal energy on decomposed multiwavelet scales of the signal before and after the fault occurring are extracted as the fault feature and used as the input of multi-dimensional wavelet network. A new model-free diagnostic method for isolating abrupt sensor faults is developed based on a proposed algorithm of multi-dimensional wavelet network constructing. The method has been proved to be quite effective in the detection of sensor abrupt fault. 2006 IEEE.

Image compression based on biorthogonal wavelet transform (EI CONFERENCE) 会议论文 OAI收割
ISCIT 2005 - International Symposium on Communications and Information Technologies 2005, October 12, 2005 - October 14, 2005, Beijing, China
作者: Gao Y.; Liu H.; Liu H.; Liu H.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

A method for image compression of biorthogonal wavelet transform based on lifting scheme with SPIHT (Set Partitioning In Hierachical Trees) is proposed in this paper. Wavelet transform affords wide space for image coding algorithms because of its excellent space-frequency localization characterizations. The compact supported symmetrical and biorthogonal wavelet has linear phase so it is applied on image compression area widely. The lifting scheme is an efficient method for constructing the wavelet filter after multiresolution. Under the condition of biorthogonal biorthogonal wavelet base can be constructed freely according to the wavelet performance. And it can quicken the implementation speed of the wavelet transform. Analyzing the algorithm of lifting scheme is applying for constructing biorthogonal wavelet. Experimental results indicate that the method of the biorthogonal wavelet that has good performances with SPIHT is applying for image compression so as image synthesis performs well. 2005 IEEE.

嵌入式操作系统ASOS的研究 学位论文 OAI收割
工学博士, 中国科学院自动化研究所: 中国科学院研究生院, 2004
作者: 朱立新

收藏 | 浏览/下载：55/0 | 提交时间：2015/09/02

特定应用嵌入式操作系统体系结构构造思想任务模型调度算法实际验证 Application Specific Embedded Operating Systems Architecture Constructing Approach Task Model Scheduling Algorithm Experimental

study on strand space model theory 期刊论文 OAI收割
JOURNAL OF COMPUTER SCIENCE AND TECHNOLOGY, 2003, 卷号: 18, 期号: 5, 页码: 553-570
Ji QG; Qing SH; Zhou YB; Feng DG

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收藏 | 浏览/下载：20/0 | 提交时间：2011/07/29

constructing attack formalizing method network security protocol generalized strand space model