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OFC/NFOEC 2007 - Optical Fiber Communication and the National Fiber Optic Engineers Conference 2007

作者： Wang, Jun Jin, Yaohui Xiang, Chao Sun, Weiqiang Guo, Wei Hu, Weisheng Zhang, Guoying Xu, Yunbin Yin, Fang Wang, Guangze Wei, Xueqing Jing, Ruiquan Zhao, Huandong State Key Lab. of Advanced Optical Commun. Systems and Networks Shanghai Jiao Tong University Shanghai 200240 China Research Institute of Telecomm. Transmission Ministry of Information Industry Beijing 100045 China Optical Network R and D Department Huawei Technologies Co. Ltd. Shenzhen 518129 China Optical Network Product Division Fiberhome Telecomm. Technologies Co. Ltd. Wuhan Hubei 430074 China China Telecom Beijing ResearchInstitute China Telecom Corporation Beijing 100035 China Shanghai Telecomm. Tech. Research Institute China Telecom Corporation Shanghai 200125 China

A field trial of dynamic P2MP connections across two domains was successfully achieved in the ASON layer of the 3TNet testbed in Yangtze River Delta, China for the first time using web service mechanism. © 2006 O... 详细信息

ISBN: (纸本)1557528314

关键词： Web services

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Automatic query type identification based on click through information

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3rd Asia Information Retrieval Symposium, AIRS 2006

作者： Yiqun, Liu Min, Zhang Liyun, Ru Shaoping, Ma State Key Lab. of Intelligent Tech. and Sys. Tsinghua University Beijing China Sogou Incorporation Beijing China

ISBN: (纸本)3540457801

We report on a study that was undertaken to better identify users' goals behind web search queries by using click through data. Based on user logs which contain over 80 million queries and corresponding click through data, we found that query type identification benefits from click through data analysis;while anchor text information may not be so useful because it is only accessible for a small part (about 16%) of practical user queries. We also proposed two novel features extracted from click through data and a decision tree based classification algorithm for identifying user queries. Our experimental evaluation shows that this algorithm can correctly identify the goals for about 80% web search queries.1 © Springer-Verlag Berlin Heidelberg 2006.

关键词： Electronic document identification systems

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A Combining Method for Tumors Detection from Near-infrared Breast Imaging

A Combining Method for Tumors Detection from Near-infrared B...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Zhicheng Wang Jian Liu Jinwen Tian Zeping Xie State Education Commission Key Laboratory for Image Processing and Intelligent Control Institute for Pattern Recognition and Artificial Intelligence Huazhong Univ. of Sci. & Tech. Wuhan 430074 China Key Lab. for Image Process. & Intelligent Control State Educ. Comm. School of Life Science & Technology Huazhong University of Science and Technology Wuhan China

This paper introduces the new qualitative and quantitative methods, which can diagnose breast tumors. Qualitative methods include blood vessel display inside and outside of pathological changes part of breast, display of equivalent pixel curves at the part of pathological changes and display of breast tumor image edge. Accordingly, three feature extraction operators are proposed, i.e. the combination operators of anisotropic gradient and smoothing operator, an improved Sobel operator and an edge sharpening operator. Furthermore, quantitative diagnostic approaches are discussed based on blood and oxygen contents according to abundant clinical data and pathological mechanism of breast tumors. The results of clinic show that the methods of combining qualitative and quantitative diagnose are effective for breast tumor images, especially for early and potential breast cancer

关键词： Breast tumors Displays Pathology Blood vessels Biomedical imaging Pixel Feature extraction Anisotropic magnetoresistance Smoothing methods Breast cancer

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A Parallel-based Lifting Algorithm and VLSI Architecture for DWT

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Journal of Electronics(China) 2006年第2期23卷 244-248页

作者： Xiong Chengyi Tian Jinwen Liu Jian Gao Zhirong The State Key Lab of Education Commission for Image Processing and Intelligent Control Institute of Pattern Recognition ＆ Artificial Intelligence Huazhong Univ. of Science ＆ Tech. Wuhan 430074 China College of Electronic Info. Eng. South- Center Univ. for Nationalities Wuhan 430074 China Dept of Computer Science Wuhan Univ. of Science ＆ Eng. Wuhan 430074 China

A novel Parallel-Based Lifting Algorithm （PBLA） for Discrete Wavelet Transform （DWT）, exploiting the parallelism of arithmetic operations in all lifting steps, is proposed in this paper. It leads to reduce the critical path latency of computation, and to reduce the complexity of hardware implementation as well. The detailed derivation on the proposed algorithm, as well as the resulting Very Large Scale Integration （VLSI） architecture, is introduced, taking the 9/7 DWT as an example but without loss of generality. In comparison with the Conventional Lifting Algorithm Based Implementation （ClabI）, the critical path latency of the proposed architecture is reduced by more than half from （4Tm ＋ 8Ta）to Tm ＋ 4Ta, and is competitive to that of Convolution-Based Implementation （CBI）, but the new implementation will save significantly in hardware. The experimental results demonstrate that the proposed architecture has good performance in both increasing working frequency and reducing area.

关键词： Discrete Wavelet Transform （DFT） Lifting scheme Parallel Very Large Scale Integration（VLSI）

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Effective topic distillation with key resource pre-selection

Effective topic distillation with key resource pre-selection

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Asia Information Retrieval Symposium, AIRS 2004

作者： Liu, Yiqun Zhang, Min Ma, Shaoping State Key Lab. of Intelligent Tech. and Sys. Tsinghua University Beijing 100084 China

Topic distillation aims at finding key resources which are high-quality pages for certain topics. With analysis in non-content features of key resources, a pre-selection method is introduced in topic distillation research. A decision tree is constructed to locate key resource pages using query-independent non-content features including in-degree, document length, URL-type and two new features we found out involving site's self-link structure analysis. Although the result page set contains only about 20% pages of the whole collection, it covers more than 70% of key resources. Furthermore, information retrieval on this page set makes more than 60% improvement with respect to that on all pages. These results were achieved using TREC 2002 web track topic distillation task for training and TREC 2003 corresponding task for testing. It shows an effective way of getting better performance in topic distillation with a dataset significantly smaller in size.1 © Springer-Verlag Berlin Heidelberg 2005.

关键词： Information analysis

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THUIR at TREC 2005: Enterprise track

THUIR at TREC 2005: Enterprise track

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14th Text REtrieval Conference, TREC 2005

作者： Fu, Yupeng Yu, Wei Li, Yize Liu, Yiqun Zhang, Min Ma, Shaoping CST Dept State Key Lab of Intelligent Tech. and Sys. Tsinghua University Beijing 100084 China

IR group of Tsinghua University participated in the expert finding task of TREC2005 enterprise track this year. We developed a novel method which is called document reorganization to solve the problem of locating expert for certain query topics. This method collects and combines related information from different media formats to organize a document which describes an expert candidate. This method proves both effective and efficient for expert finding task. Our submitted run (THUENT0505) obtains the best performance in all participants with evaluation metric MAP. The reorganized documents are also significantly smaller in size than the original corpus.

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THUIR at TREC 2005 terabyte track

THUIR at TREC 2005 terabyte track

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14th Text REtrieval Conference, TREC 2005

作者： Zhao, Le Ceng, Rongwei Zhang, Min Yijiang, Jin Ma, Shaoping CST Dept State Key Lab of Intelligent Tech. and Sys. Tsinghua University Beijing 100084 China

IR group of Tsinghua University this year has used its TMiner text retrieval system for indexing and retrieval of the Terabyte track ad hoc and named-page subtasks. In doing the two tasks, we used the in-link anchor texts (the anchor of the URLs that point to the current page in the collection) together with the content texts of the web pages for building the indices. When retrieving, the word-pair method [1] was used and proved effective on 2004 and 2005 Terabyte ad hoc task topics and the 2005 named-page task. We analyze the performance of word-pair method in comparison with the Markov random field term dependence model of [2] and a generative phrase model we proposed, which is natural on the language modeling framework [3].

关键词： Websites

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Segmentation of connected Chinese characters based on genetic algorithm

Segmentation of connected Chinese characters based on geneti...

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8th International Conference on Document Analysis and Recognition

作者： Xianghui, Wei Shaoping, Ma Yijiang, Jin Institute of Software CAS State Key Lab. of Intelligent Tech. and Sys. CST Dept. Tsinghua University Beijing 100084 China

ISBN: (纸本)0769524206

The accuracy of segmenting Chinese character, especially connected Chinese characters, is essential for the performance of a Chinese character recognition system. In this paper, a new approach for segmenting connected Chinese characters based on genetic algorithm is proposed. The best segmentation path is evolved by genetic algorithm from a fixed area located in the middle of character image which is defined as Segmentation Path Zone (SPZ). The initial population is composed of each point line in SPZ. The individual coding, fitness function, crossover operator and mutation operator are also defined for this task. Experimental results on a dataset extracted from the Four Vaults show that our approach can get an average accuracy of 88.9% on test set and can handle some complex types of connected Chinese characters without special heuristic rules. © 2005 IEEE.

关键词： Image segmentation

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Detection of phishing webpages based on visual similarity 05

Detection of phishing webpages based on visual similarity

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14th International World Wide Web Conference, WWW2005

作者： Wenyin, Liu Huang, Guanglin Xiaoyue, Liu Min, Zhang Deng, Xiaotie Department of Computer Science City University of Hong Kong Hong Kong Hong Kong Department of Chinese Translation and Linguistics City University of Hong Kong Tat Chee Avenue Hong Kong Hong Kong State Key Lab of Intelligent Tech. and Sys. Tsinghua University Beijing 100084 China

ISBN: (纸本)1595930515

An approach to detection of phishing webpages based on visual similarity is proposed, which can be utilized as a part of an enterprise solution for anti-phishing. A legitimate webpage owner can use this approach to search the Web for suspicious webpages which are visually similar to the true webpage. A webpage is reported as a phishing suspect if the visual similarity is higher than its corresponding preset threshold. Preliminary experiments show that the approach can successfully detect those phishing webpages for online use.

关键词： Information filtering

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A secure image authentication algorithm with pixel-level tamper localization

A secure image authentication algorithm with pixel-level tam...

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2004 International Conference on Image Processing, ICIP 2004

作者： Wu, Jinhai Zhu, Bin B. Li, Shipeng Lin, Fuzong State Key Lab of Intelligent Tech. and Systems Tsinghua Univ. Beijing 100084 China Microsoft Research Asia Beijing 100080 China

ISBN: (纸本)0780385543

In this paper, we use a generalized model for all the previously proposed pixel-wise authentication schemes. Then we show how this model can be compromised with an oracle attack. This motivated us to develop a novel authentication scheme to be described here. The new scheme is designed to detect any changes to a signal. It consists of two mechanisms dedicated to authenticity verification for a signal and localization of tampered pixels, respectively. The scheme is secure yet maintains the fine tamper localization capability of a pixel-wise scheme. Experimental results show that the proposed scheme has a good accuracy in locating tampered pixels. ©2004 IEEE.

关键词： Image analysis

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