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Conservation laws for variable coefficient nonlinear wave equations with power nonlinearities

Chinese Physics B 2011年第7期20卷 22-27页

作者：黄定江周水庚杨勤民 Department of Mathematics East China University of Science and Technology School of Computer Science Fudan University Shanghai Key Laboratory of Intelligent Information Processing Fudan University

Conservation laws for a class of variable coefficient nonlinear wave equations with power nonlinearities are investigated. The usual equivalence group and the generalized extended one including transformations which are nonlocal with respect to arbitrary elements are introduced. Then, using the most direct method, we carry out a classification of local conservation laws with characteristics of zero order for the equation under consideration up to equivalence relations generated by the generalized extended equivalence group. The equivalence with respect to this group and the correct choice of gauge coefficients of the equations play the major roles for simple and clear formulation of the final results.

关键词： nonlinear wave equations conservation laws equivalence group symmetries

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Fast Template Matching with Partial Skipping Using Sub-template

Fast Template Matching with Partial Skipping Using Sub-templ...

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International Conference on Audio, Language and Image processing

作者： Qiao Zhang Huijie Gao Zhen Kang State Key Lab. of Multi-spectral Information Processing Technology Institute for Pattern Recognition and Artificial Intelligence School of Mathematic & Computer Science Wuhan Polytechnic University

ISBN: (纸本)9781467301732

This paper presents a new fast template matching method with partial skipping using sub-template. In this method, we use sub-template to search point by point in the current searched window, and compare every SAD with threshold, if some SAD exceeds the threshold, set the new threshold equal to this SAD value and this point is one potential optimization location, when all points in the current window are compared, we will get a minimum value and a optimization location, then skip the other points whose SAD is not the minimum value. In other words, the searching step is that template size subtracts the sub-template size, and we set the next threshold equal to the current optimization SAD value, we update the threshold and the optimal point until the end of the searched image like this, then will find the global minimum points and its SAD value. Experimental results show that the proposed method is near one hundred times faster than the conventional template match method.

关键词： Computational efficiency Prediction algorithms Search problems Accuracy Correlation Signal processing algorithms Pattern recognition

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Practical privacy for value-added applications in vehicular ad hoc networks 5th

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5th International Conference on Internet and Distributed Computing Systems, IDCS 2012

作者： Zhang, Lei Wu, Qianhong Qin, Bo Domingo-Ferrer, Josep Shanghai Key Laboratory of Trustworthy Computing Software Engineering Institute East China Normal University Shanghai China UNESCO Chair in Data Privacy Dept. of Comp. Eng. and Maths Universitat Rovira i Virgili TarragonaCatalonia Spain Key Lab. of Aerospace Information Security and Trusted Computing Ministry of Education Wuhan University School of Computer China Department of Maths School of Science Xi’an University of Technology China

ISBN: (纸本)9783642348822

Advances in mobile networking and information processing technologies have triggered vehicular ad hoc networks (VANETs) for traffic safety and value-added applications. Most efforts have been made to address the security concerns while little work has been done to investigate security and privacy for value-added applications in VANETs. To fill this gap, we propose a value-added application, specifically, a security and privacy preserving location-based service (LBS) scheme for VANETs. For each LBS transaction, the scheme provides authentication, integrity and non-repudiation for both the service provider and the user. A user can obtain the service in an anonymous way and hence user privacy is well protected. However, a tracing procedure can be invoked to find malicious users, thereby efficiently preventing users from abusing the anonymity provided by the system. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Location based services

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Using Syntactic Head information in Hierarchical Phrase-Based Translation 12

Using Syntactic Head Information in Hierarchical Phrase-Base...

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Workshop on Statistical Machine Translation

作者： Junhui Li Zhaopeng Tu Guodong Zhou Josef van Genabith Centre for Next Generation Localisation School of Computing Dublin City University Key Lab. of Intelligent Info. Processing Institute of Computing Technology Chinese Academy of Sciences School of Computer Science and Technology Soochow University China

ISBN: (纸本)9781622765928;1622765923

Chiang's hierarchical phrase-based (HPB) translation model advances the state-of-the-art in statistical machine translation by expanding conventional phrases to hierarchical phrases - phrases that contain sub-phrases. However, the original HPB model is prone to over-generation due to lack of linguistic knowledge: the grammar may suggest more derivations than appropriate, many of which may lead to ungrammatical translations. On the other hand, limitations of glue grammar rules in the original HPB model may actually prevent systems from considering some reasonable derivations. This paper presents a simple but effective translation model, called the Head-Driven HPB (HD-HPB) model, which incorporates head information in translation rules to better capture syntax-driven information in a derivation. In addition, unlike the original glue rules, the HD-HPB model allows improved reordering between any two neighboring non-terminals to explore a larger reordering search space. An extensive set of experiments on Chinese-English translation on four NIST MT test sets, using both a small and a large training set, show that our HD-HPB model consistently and statistically significantly outperforms Chiang's model as well as a source side SAMT-style model.

关键词： Syntactic information Hierarchical Phrase-Based Translations syntax Translation machine translation Translation Process Hierarchical Rule train stock Glues derivation Head

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Head-Driven Hierarchical Phrase-based Translation 12

Head-Driven Hierarchical Phrase-based Translation

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Annual Meeting of The Association for Computational Linguistics

ISBN: (纸本)9781622761715

This paper presents an extension of Chiang's hierarchical phrase-based (HPB) model, called Head-Driven HPB (HD-HPB), which incorporates head information in translation rules to better capture syntax-driven information, as well as improved reordering between any two neighboring non-terminals at any stage of a derivation to explore a larger reordering search space. Experiments on Chinese-English translation on four NIST MT test sets show that the HD-HPB model significantly outperforms Chiang's model with average gains of 1.91 points absolute in BLEU.

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Tissue P systems with cell separation: attacking the partition problem

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science China(information sciences) 2011年第2期54卷 293-304页

作者： ZHANG XingYi1, WANG Shuo2, NIU YunYun2 & PAN LinQiang2 1key lab of intelligent Computing and Signal processing of Ministry of Education, school of computer science and technology, Anhui University, Hefei 230039, China 2Image processing and intelligent Control key laboratory of Education Ministry of China, Department of Control science and Engineering, Huazhong University of science and technology, Wuhan 430074, China 1. Key Lab of Intelligent Computing and Signal Processing of Ministry of Education School of Computer Science and Technology Anhui University Hefei 230039 China2. Image Processing and Intelligent Control Key Laboratory of Education Ministry of China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Tissue P systems are distributed parallel and non-deterministic computing models in the framework of membrane computing, which are inspired by intercellular communication and cooperation between neurons. Recently, cell separation is introduced into tissue P systems, which enables systems to generate an exponential workspace in a polynomial time. In this work, the computational power of tissue P systems with cell separation is investigated. Specifically, a uniform family of tissue P systems with cell separation is constructed for effciently solving a well-known NP-complete problem, the partition problem.

关键词： membrane computing tissue P system cell separation partition problem

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Minimizing the Impact of Long Propagation Delay on Multiple Access for Wireless Networks

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China Communications 2011年第7期8卷 21-33页

作者：刘凯李亚燕王新 School of Electronics and Information Engineering Beihang University Shanghai Key Lab of Intelligent Information Processing School of Computer Science Fudan University

A multiple access protocol is proposed to greatly improve multiple access performance of wireless networks with long propagation delay. All the nodes with packets to send can make rapid successful reservation in access reservation mini-slots, which is adaptively adjusted according to current traffic load and idle channel resources. A Central Control Node (CCN) coordinates channel reservation and allocates on-demand channel resources to the successfully accessed nodes on two channels. Each node can employ only one handshake to accomplish each communication session, and transmit one or multiple data packets piggybacked with acknowledgment (ACK) information to one or multiple destination nodes in each frame until the end of their communication sessions, which greatly minimizes the impact of long propagation delay caused by handshakes and improves channel efficiency. Simulation results show that the proposed protocol obviously outperforms the Centralized Scheduling-based Medium Access Control (CSMAC) protocol, especially in the presence of long propagation delay.

关键词： wireless networks multiple access on-demand reservation conflict-free transmission long propagation delay

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Chinese NER hybrid pattern based on multi-feature fusion

Chinese NER hybrid pattern based on multi-feature fusion

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2011 International Conference on Machine Learning and Cybernetics, ICMLC 2011

作者： Zhang, Yue-Jie Wu, Wei Jin, Cheng Zhang, Tao School of Computer Science Shanghai Key Laboratory of Intelligent Information Processing Fudan University Shanghai 200433 China School of Information Management and Engineering Shanghai University of Finance and Economics Shanghai 200433 China

ISBN: (纸本)9781457703065

This paper focuses on the Chinese Named Entity Recognition (NER) hybrid pattern, and emphasizes particularly on the fusion mechanism of multiple features for NE acquisition. It differentiates from most of previous methods mainly as that Local Features and Global Features are integrated to get higher performance. Meanwhile, to reduce search space and improve processing efficiency, Heuristic Human Knowledge is introduced into the statistical model, which could increase the performance significantly. From the experimental results on data sets of People's Daily and NER Task in SIGHAN2008, it can be concluded that our hybrid model based on multi-feature fusion is an effective NER pattern to combine statistical model and heuristic human knowledge. © 2011 IEEE.

关键词： Random processes

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Multi-feature representation for Web-based English-Chinese OOV term translation

Multi-feature representation for Web-based English-Chinese O...

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2011 International Conference on Machine Learning and Cybernetics, ICMLC 2011

作者： Zhang, Yue-Jie Su, Yan-Xia Jin, Cheng Zhang, Tao School of Computer Science Shanghai Key Laboratory of Intelligent Information Processing Fudan University Shanghai 200433 China School of Information Management and Engineering Shanghai University of Finance and Economics Shanghai 200433 China

ISBN: (纸本)9781457703065

This paper focuses on the Web-based English-Chinese Out-of-Vocabulary (OOV) term translation pattern, and emphasizes particularly on the selection strategy based on the multi-feature representation for translation evaluation. Three kinds of feature, local feature, global feature and Boolean feature, are extracted from translation candidates based on the fusion strategy of multi-features. By utilizing the CoNLL 2003 corpus for the English Named Entity Recognition (NER) task, the related experiments based on such a standard data source show the promising results. The established multi-feature representation mechanism for English-Chinese OOV term translation model can filter the most possible translation candidate with better ability. © 2011 IEEE.

关键词： Websites

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Improving stock market prediction by integrating both market news and stock prices

Improving stock market prediction by integrating both market...

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22nd International Conference on Database and Expert Systems Applications, DEXA 2011

作者： Li, Xiaodong Wang, Chao Dong, Jiawei Wang, Feng Deng, Xiaotie Zhu, Shanfeng Department of Computer Science City University Hong Kong Hong Kong Shanghai Key Lab of Intelligent Information Processing School of Computer Science Fudan University Shanghai 200433 China School of Computer State Key Lab of Software Engineering Wuhan University Wuhan 430072 China Department of Computer Science University of Liverpool Liverpool United Kingdom

ISBN: (纸本)9783642230905

Stock market is an important and active part of nowadays financial markets. Addressing the question as to how to model financial information from two sources, we focus on improving the accuracy of a computer aided prediction by combining information hidden in market news and stock prices in this study. Using the multi-kernel learning technique, a system is presented that makes predictions for the Hong Kong stock market by incorporating those two information sources. Experiments were conducted and the results have shown that in both cross validation and independent testing, our system has achieved better directional accuracy than those by the baseline system that is based on single one information source, as well as by the system that integrates information sources in a simple way. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Forecasting

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