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2012 IEEE 21st Asian Test Symposium, ATS 2012

作者： Hu, Yu Gu, Xinli Li, Xiaowei State Key Laboratory of Computer Architecture Institute of Computing Technology CAS Beijing China North America Network Division Huawei Technologies Co. Ltd Santa Clara United States

ISBN: (纸本)9780769548760

NAND Flash memories have rapidly emerged as a storage class memory such as SSD, CF Card, SD Card. Due to its distinct operation mechanisms, NAND Flash memory suffers from erase/program endurance, data retention and program/read disturbance problems. In this work, we propose an in-field testing technique which takes some pages in a block as predictors. We will discuss the proposed technique in detail in the poster session. © 2012 IEEE.

关键词： NAND circuits

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The extraction of manuscript information of mural based on hyper-spectral data

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International Review on computers and Software 2012年第6期7卷 3232-3237页

作者： Hou, Miaole Lei, Yong Lu, Xin Zhang, Xuedong Hu, Yungang Institute of the Computer Teaching Network Information Department Beijing university of Civil Engineering and Architecture Beijing China School of Geomatics and Urban Information Beijing university of Civil Engineering and Architecture Beijing China

The manuscript of mural not only reflected the basic concept of the artist before the complete painting was created, but also revealed painting techniques of different historical periods. They had important significance of research. In this paper, it was the first time to extract the manuscript of mural using hyper-spectral imaging technology. As the hyper-spectral data had the feature which was high data volume and high correlation between adjacent bands, firstly, we used the method of principal component analysis to reduce the dimension of the data, and then, extracted and analyzed the characteristic bands, at last, extracted the manuscript of mural by supervised classification. The method was achieved with C# and IDL in this paper. To verify the effectiveness of the method, Hyper-spectral image of a mural is taken as an example in this paper;the contribution rate of the first principal component was more than 90%. The characteristic bands could be selected from the mass data by drawing the weight coefficient curve of the first principal component. At last, this test respectively dealt with the original image and the new image using classification processing. The result showed that the method could significantly improve the extraction efficiency of manuscript. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.

关键词： Principal component analysis

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Beyond Synchrony: Complementarity and Asynchrony in Joint Action 35

Beyond Synchrony: Complementarity and Asynchrony in Joint Ac...

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35th Annual Meeting of the Cognitive Science Society - Cooperative Minds: Social Interaction and Group Dynamics, CogSci 2013

作者： Dale, Rick Fusaroli, Riccardo Håkonsson, Dorthe Døjbak Healey, Patrick Mønster, Dan McGraw, John J. Mitkidis, Panagiotis Tylén, Kristian Cognitive and Information Sciences UC Merced 5200 N. Lake Road MercedCA95343 United States Center for Semiotics The Interacting Minds Center Aarhus University Jens Chr. Skous Vej 2 Aarhus C8000 Denmark Interdisciplinary Center for Organizational Architecture Fuglesangs Allé 20 Building 2635 I106 Aarhus V8210 Denmark Department of Computer Science and Electronic Engineering Queen Mary University of London Mile End Road LondonE1 4NS United Kingdom School of Business and Social Sciences Department of Economics and Business Fuglesangs Allé 4 Aarhus V8210 Denmark TESIS Network Østboulevarden 11F Aarhus C2 8000 Denmark Center for Advanced Hindsight Social Science Research Institute Duke University 2024 West Main Street DurhamNC27705 United States

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Construction and evaluation of it security domain-specific vocabulary

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International Journal of Advancements in Computing Technology 2012年第18期4卷 341-349页

作者： Qian, Liping Wang, Lidong School of Information Renmin University of China Beijing China Dept. Of Computer Science Beijing University of Civil Engineering and Architecture China National Institute of Network and Information Security CNCERT/CC China

The volume of published scientific literature available on Internet has been increasing exponentially. Some of them reflect the latest achievement of the specific research domain. In recent years, many projects have been funded aiming to online scientific literature mining, especially in biomedical research. Scientific literature covers most of the hot topics in the research field and has a very large domain-specific vocabulary. The exploitation of domain knowledge and specialized vocabulary can dramatically improve the result of literature text processing. To evaluate the discriminating capability of vocabularies automatically constructed from domain and non-domain specific corpus, the concept of discrimination index defined by Cosine similarity and Jicard distance was introduced. To validate the effectiveness of domain-specific vocabulary, a large-scale corpus was built from abstract content in IT security literature retrieved from open literature database and annotated manually by experts. Domain vocabularies of single word-vocabulary and co-occurrence phrase-vocabulary were constructed from positive and negative corpus with TF/IDF-like schema. The paper firstly carried some discussion on soundness of its customized seed keywords submit to do "AND"-mode search by retrieval efficiency analysis, it also presented yearly distribution analysis on the retrieved paper and ranked phrases in different vocabularies. The discrimination index values between these vocabularies show that domain vocabulary is more representative and the experimental result of document classification confirms the effectiveness of domain-specific vocabulary although there is no much difference in performance between single word -vocabulary and bi-lexical co-occurrence domain vocabulary.

关键词： Text processing

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In-Field Testing of NAND Flash Storage: Why and How?

In-Field Testing of NAND Flash Storage: Why and How?

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Asian Test Symposium (ATS)

作者： Yu Hu Xinli Gu Xiaowei Li State Key Laboratory of Computer Architecture Institute of Computing Technology CAS Beijing China North America Network Division Huawei Technologies Company Limited Santa Clara USA

NAND Flash memories have rapidly emerged as a storage class memory such as SSD (Solid State Disk), CF (Compact Flash) Card, SD (Secure Digital Memory) Card. Due to its distinct operation mechanisms, NAND Flash memory suffers from erase/program endurance, data retention and program/read disturbance problems. Specifically, erase and program operation keeps in developing bad blocks during the lifetime of memory chips. Bad blocks are blocks that contain faulty bits but the ECC (Error Correction Code) algorithm cannot correct them. Although wear leveling tries to balance the erase/program operations on different blocks so that all blocks can wear out at a similar pace, new bad blocks still inevitably *** propose an in-field testing technique which takes some pages in a block as predictors. Due to wear out faster than the other pages, the predictors will become bad before the other pages in the block become bad. The further questions are (1) how to detect those wearing fast pages so as to use them as predictors, (2) how many predictors are needed to achieve a satisfactory prediction accuracy, (3) misprediction will result in what negative impact on performance and endurance.

关键词： Flash memory Error correction codes Laboratories computer architecture North America computers

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Revisiting Multiple Pattern Matching Algorithms for Multi-Core architecture

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Journal of computer Science & Technology 2011年第5期26卷 866-874页

作者：谭光明刘萍卜东波刘燕兵 Key Laboratory of Computer System and Architecture Institute of Computing TechnologyChinese Academy of Sciences Key Laboratory of Network Technology Institute of Computing TechnologyChinese Academy of Sciences

Due to the huge size of patterns to be searched,multiple pattern searching remains a challenge to several newly-arising applications like network intrusion *** this paper,we present an attempt to design efficient multiple pattern searching algorithms on multi-core *** observe an important feature which indicates that the multiple pattern matching time mainly depends on the number and minimal length of *** multi-core algorithm proposed in this paper leverages this feature to decompose pattern set so that the parallel execution time is *** formulate the problem as an optimal decomposition and scheduling of a pattern set,then propose a heuristic algorithm,which takes advantage of dynamic programming and greedy algorithmic techniques,to solve the optimization *** results suggest that our decomposition approach can increase the searching speed by more than 200% on a 4-core AMD Barcelona system.

关键词： parallel algorithm multi-core multiple pattern matching

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Image Retrieval in Data Stream Using Principle Component Analysis

Image Retrieval in Data Stream Using Principle Component Ana...

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International Conference on Consumer Electronics, Communications and networks

作者： Han-Bing Yan Ya-Shu Liu National Institute of Network and Information Security Department of Computer Science Beijing University of Civil Engineering and Architecture

ISBN: (纸本)9781457714146

Image Retrieval in Data Stream is becoming very important in recent years with the development of internet and the focus on information security. In Data Stream, image retrieval is different from the traditional image retrieval in that, it requires high efficiency and network adaptive ability, while the traditional image retrieval does not have such hard requirements. In this paper, we propose a novel approach to retrieval image in data stream using Principle Component Analysis (PCA). By subdividing image into several blocks and extracting image principle features, our method can retrieval image very efficiently, this meets the needs of wide band width network traffic. Because the natural character of PCA, our method can be adaptive to the network traffic by simply modify a few parameters by an automatic way. Our experiments show that our approach has high Recall Rate and very low False Positive Rate.

关键词： Image Retrieval Principle Component Analysis Data Stream

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A Cross-Layer Security Framework for Wireless Mesh networks

A Cross-Layer Security Framework for Wireless Mesh Networks

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2011 International Conference on Future Wireless networks and Information Systems(ICFWI 2011)

作者： Chuyuan Wei Yongzhen Li Cheng Lv Dept.of Computer Teaching and Network Information Beijing Institute of Civil Engineering and Architecture

Wireless mesh networks is a new type of broadband access *** has very typical network architecture of hybrid mesh network *** wireless mesh network with distributed network architecture,it is relatively fragile and vulnerable to *** this paper,we first analyze the characters of hybrid mesh network *** security weaknesses of WMNs mainly reflected in the transmission channel,authentication,physical protection and routing *** the basis of analysis of security defects of WMNs,we design a cross-layer security framework to improve the security of *** last,we interpret some key Technologies in this security Framework.

关键词： wireless mesh network,secure framework,secure routing,secure authentication,group key management

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Research on Qo S Routing Protocols in Wireless Mesh networks

Research on Qo S Routing Protocols in Wireless Mesh Networks

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2011 International Conference on Frontiers in computer Education(ICFCE 2011)

作者： Chuyuan Wei Xuhua Sun Yongzhen Li Dept.of Computer Teaching and Network Information Beijing Institute of Civil Engineering and Architecture

The guarantee of quality of service(Qo S) is very critical for wireless mesh networksThis paper firstly analyzes the characteristics of Wireless Mesh networksThe related concepts, Qo S routing problems, Qo S routing performance metrics, some key solutions to the research situation are summarized and reviewed in this paperWe focus on the classification of routing protocols of wireless mesh network and the strengths and weaknesses of existed routing protocols of wireless mesh networkAt last, the difficulties, key elements and design thoughts were discussed and analyzedThe intelligent optimization methods become the primary method to solve the problem.

关键词： Wireless mesh network Routing protocol Qo S routing

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A Study on IT-security vocabulary for domain document classification

A Study on IT-security vocabulary for domain document classi...

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2011 7th International Conference on Computational Intelligence and Security, CIS 2011

作者： Qian, Liping Wang, Lidong School of Information Renmin University of China Beijing China Department of Computer Science Beijing University of Civil Engineering and Architecture Beijing China National Institute of Network Information Security CNCERT/CC Beijing China

ISBN: (纸本)9780769545844

关键词： Text processing

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