检索结果-内蒙古大学图书馆

Power minimization with derivative constraints for high dynamic GPS interference suppression

Science China(Information Sciences) 2012年第4期55卷 857-866页

作者： WU RenBiao 1,2,LI Chan 1 & LU Dan 1 1 Tianjin key laboratory for Advanced signal processing,Civil Aviation University of China,Tianjin 300300,China 2 intelligent Information Institute of ATR Lab,Shenzhen University,Shenzhen,518060,China Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University of China Tianjin China Intelligent Information Institute of ATR Lab Shenzhen University Shenzhen China

In this paper,a novel adaptive interference suppression algorithm is proposed for high dynamic GPS (global positioning system) *** new method incorporates derivative constraints on the inter-ference DOA (direction of arrival) into power minimization approach,which could broaden the width of nulls in the interferences directions and adapt to the rapid change of the interference *** with the traditional wide nulling algorithm based on the derivative constraints,the new method does not have to know or estimate the DOAs of the desired signal and the *** new method is firstly discussed in the context of spatial processing,and then extended to space-time adaptive processing to mitigate wideband diffusive multipath *** of the new method is verified via simulation examples.

关键词： GPS interference cancellation adaptive arrays space-time adaptive processing high dynamic GPS receiver

来源：评论

学校读者我要写书评

暂无评论

Iterative annotation transformation with predict-self reestimation for Chinese word segmentation

Iterative annotation transformation with predict-self reesti...

引用

2012 Joint Conference on Empirical Methods in Natural Language processing and Computational Natural Language Learning, EMNLP-CoNLL 2012

作者： Jiang, Wenbin Meng, Fandong Liu, Qun Lü, Yajuan Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences China

ISBN: (纸本)9781937284435

In this paper we first describe the technology of automatic annotation transformation, which is based on the annotation adaptation algorithm (Jiang et al., 2009). It can automatically transform a human-annotated corpus from one annotation guideline to another. We then propose two optimization strategies, iterative training and predict-self reestimation, to further improve the accuracy of annotation guideline transformation. Experiments on Chinese word segmentation show that, the iterative training strategy together with predict-self reestimation brings significant improvement over the simple annotation transformation baseline, and leads to classifiers with significantly higher accuracy and several times faster processing than annotation adaptation does. On the Penn Chinese Treebank 5.0, it achieves an F-measure of 98.43%, significantly outperforms previous works although using a single classifier with only local features. © 2012 Association for Computational Linguistics.

关键词： Iterative methods

来源：评论

学校读者我要写书评

暂无评论

A novel STAP method for the detection of fast air moving targets from high speed platform

引用

Science China(Information Sciences) 2012年第6期55卷 1259-1269页

作者： WU RenBiao 1,2,JIA QiongQiong 1 & LI Hai 1 1 Tianjin key laboratory for Advanced signal processing,Civil Aviation University of China,Tianjin 300300,China 2 intelligent Information Institute of ATR Lab,Shenzhen University,Shenzhen 518060,China Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University of China Tianjin China Intelligent Information Institute of ATR Lab Shenzhen University Shenzhen China

Space-time adaptive processing (STAP) is an effective method for detecting moving target in airborne/spaceborne ***,the detection of fast air moving targets from high speed platform is challenged by the range walk of both the clutter and moving *** is well known that keystone formatting can be used to compensate for the range walk of multiple moving targets simultaneously without using the knowledge of the motion ***,in the presence of serious Doppler ambiguity of fast air moving targets,distribution of the clutter will be affected by the keystone formatting matched to the ambiguity number of targets,and as a result the STAP performance will *** this paper,a novel STAP method is proposed for the detection of fast air moving targets from high speed platform,which can deal with the range walk of both clutter and *** of the new method is verified via simulation examples.

关键词： airborne/spaceborne radar keystone formatting space-time adaptive processing (STAP) moving target detection

来源：评论

学校读者我要写书评

暂无评论

The correspondence between the concepts in description logics for contexts and formal concept analysis

引用

Science China(Information Sciences) 2012年第5期55卷 1106-1122页

作者： MA Yue 1,2,SUI YueFei 1 & CAO CunGen 1 1 key laboratory of intelligent Information processing,Institute of computing Technology,Chinese Academy of Sciences,Beijing 100190,China 2 Graduate University of Chinese Academy of Sciences,Beijing,China Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China

Formal concept analysis (FCA) and description logic (DL) are meant to be formalizations of concepts.A formal concept in the former consists of its intent and extent,where the intent is the set of all the attributes shared by each object in the extent of the concept,and the extent is the set of all the objects sharing each property in the intent of the concept.A concept in the latter formalization is simply a concept name,the interpretation of which is a subset of a *** consider the correspondence between concepts in both formalizations,a multi-valued formal context must be represented both as a knowledge base and as a model of the DL for contexts,where concepts are decomposed into tuple concepts C,interpreted as a set of tuples and value concepts V,interpreted as a set of attribute-value *** show that there is a difference between the interpretation of concepts R.V /R.C and the Galois connection between the extent/intent of formal concepts in *** to the Galois connection,there should be concepts of the form + R.V and + R.C inter-preted in FCA,and hence the logical language L for DL is extended to be L + together with + as a constructor so that + R.V and + R.C are well-defined ***,according to the interpretation in DL there should be pseudo concepts in FCA so that the interpretation of concepts R.V /R.C is the extent/intent of pseudo *** correspondence between formal concepts and concepts in L +,and between pseudo concepts and concepts in L are presented in this paper.

关键词： description logic formal concept analysis concept attribute/role

来源：评论

学校读者我要写书评

暂无评论

A direct product decomposition of QMV algebras

引用

Science China Mathematics 2012年第4期55卷 841-850页

作者： LU Xian 1 ,SHANG Yun 1,& LU RuQian 1,2 1 Institute of Mathematics,Academy of Mathematics and Systems Science,Beijing 100190,China 2 key laboratory of intelligent Information processing,Institute of computing Technology,Chinese Academy of Sciences,Beijing 100190,China Institute of Mathematics Academy of Mathematics and Systems Science Beijing China Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing China

We study the direct product decomposition of quantum many-valued algebras (QMV algebras) which generalizes the decomposition theorem of ortholattices (orthomodular lattices).In detail,for an idempo- tent element of a given QMV algebra,if it commutes with every element of the QMV algebra,it can induce a direct product decomposition of the QMV *** the same time,we introduce the commutant C(S) of a set S in a QMV algebra,and prove that when S consists of idempotent elements,C(S) is a subalgebra of the QMV *** also generalizes the cases of orthomodular lattices.

关键词： QMV algebra commutativity idempotent decomposition theorem

来源：评论

学校读者我要写书评

暂无评论

Study on the gain media using FDTD and four energy level model

Study on the gain media using FDTD and four energy level mod...

引用

2012 10th International Symposium on Antennas, Propagation and EM Theory, ISAPE 2012

作者： Bingbing, Sun Hui, Wang Bo, Wu Xiang, Huang Zhi Liang, Wu Xian Key Laboratory of Intelligent Computing and Signal Processing Annui University Hefei 230039 China Department of Physics and Electronic Engineering Hefei Normal University Hefei 230039 China

ISBN: (纸本)9781467317993

In order to investigate the gain media which were widely used in metamaterial, a four energy level model is proposed. We solve three groups of coupled equations: Maxwell equations, rate equations of electronic population and polarization equation. Population inversion and lasing threshlod were observed using numerical experiments based on a novel finite-difference time-domain (FDTD) treatment of the optical field. These results show good agreement with lasing theories and our numerical model can be used as an efficient tool for pursuing novel laser devices. © 2012 IEEE.

关键词： Maxwell equations

来源：评论

学校读者我要写书评

暂无评论

Determination of effective parameters in negative-index optical metamaterials

Determination of effective parameters in negative-index opti...

引用

2012 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2012

作者： Ding, Min Huang, Zhi-Xiang Wu, Xian-Liang Wang, Wang Wu, Ying-Ying Key Laboratory of Intelligent Computing and Signal Processing Anhui University Hefei 230039 China Department of Physics and Electronic Engineering Hefei Normal University Hefei 230061 China

ISBN: (纸本)9781467321839

We present an enhanced algorithm based on the Kramers-Kronig (K-K) relations, which extracts the effective parameters such as the electric permittivity Ε and magnetic permeability μ of a composite electromagnetic structure from calculated or measured transmission and reflection data. For the general structure, the retrieved parameters are broadly similar whether obtained by the traditional retrieval algorithm or the improved one. For the multilayer negative-index optical metamaterials, the improved algorithm is competent instead of the traditional one due to the calculation involves a branching problem, and the K-K relations can be applied to remove the problem. © 2012 IEEE.

关键词： Multilayers

来源：评论

学校读者我要写书评

暂无评论

Application of AWE technology combined with higher-order basis functions to broad band electromagnetic scattering problems

Application of AWE technology combined with higher-order bas...

引用

2012 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2012

作者： Ma, Tao Chen, Ming-Sheng Wu, Xian-Liang Qi, Qi Liu, Yi Hao, Ming-Ming Key Laboratory of Intelligent Computing and Signal Processing Anhui University Hefei 230039 China Department of Physics and Electronic Engineering Hefei Normal University Hefei 230061 China

ISBN: (纸本)9781467321839

In this paper, the asymptotic waveform evaluation (AWE) technique in conjugation with higher-order basis functions method based on the best uniform approximation theory is applied to solve scattering problems over a broad frequency band. To select the best uniform approximation higher-order basis functions, 3-order Chebyshev basis function is used as an example and applied to solving the electrical field integral equation (EFIE) by the method of moments(MOM). Finally, using AWE technique to solving the discrete linear system obtained by high order basis function to accomplish the scattering analysis of perfectly electrical conductor (PEC) over a broad frequency band. It is shown that the presented method has higher computational precision with lower discretization, and greatly improve the computational efficiency. © 2012 IEEE.

关键词： Radar cross section

来源：评论

学校读者我要写书评

暂无评论

Effectively constructing reliable data for cross-domain text classification 1

引用

7th IFIP International Conference on intelligent Information processing, IIP 2012

作者： Zhuang, Fuzhen He, Qing Shi, Zhongzhi Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing China

ISBN: (数字)9783642328916

ISBN: (纸本)9783642328909

Traditional classification algorithms often fail when the independent and identical distributed (i.i.d.) assumption does not hold, and the cross-domain learning emerges recently is to deal with this problem. Actually, we observe that though the trained model from training data may not perform well over all test data, it can give much better prediction results on a subset of the test data with high prediction confidence. Also this subset of data from test data set may have more similar distribution with the test data. In this study, we propose to construct the reliable data set with high prediction confidence, and use this reliable data as training data. Furthermore, we develop an EM algorithm to refine the model trained from the reliable data. The extensive experiments on text classification verify the effectiveness and efficiency of our methods. It is worth to mention that the model trained from the reliable data achieves a significant performance improvement compared with the one trained from the original training data, and our methods outperform all the baseline algorithms. © 2012 IFIP International Federation for Information processing.

关键词： Forecasting

来源：评论

学校读者我要写书评

暂无评论

FDTD method using in one dimension quantum mechanics problem

FDTD method using in one dimension quantum mechanics problem

引用

2012 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2012

作者： Sun, Bingbing Huang, Zhixiang Wu, Xianliang Lu, Silong Wang, Hui Key Laboratory of Intelligent Computing and Signal Processing Anhui University Hefei 230039 China Department of Physics and Electronic Engineering Hefei Normal University Hefei 230061 China

A new FDTD approach which solves time dependent schrödinger equation is presented. The formulation and the stability analysis of the method are also included. A numerical example is illustrated as well to verify ... 详细信息

ISBN: (纸本)9781467321839

关键词： Quantum theory

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：