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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8933卷 227-238页

作者： Zou, Benyou Zou, Benyou Li, Cuiping Tan, Liwen Tan, Liwen Chen, Hong Key Lab of Data Engineering and Knowledge Engineering of MOE Renmin University of China Beijing100872 China School of Information Renmin University of China Beijing100872 China

Newly emerging location-based online social services, such as Meetup and Douban, have experienced increased popularity and rapid growth. The classical Matrix Factorization methods usually only consider the user-item matrix. Recently, Researchers have extended the matrix adding location context as a tensor and used the Tensor Factorization methods for this scenario. However, in real scenario, the users and events are changing over time, the classical Tensor Factorization methods suffers the limitation that it can only be applied for static settings. In this paper, we propose a general Incremental Tensor Factorization model, which models the appearance changes of a tensor by adaptively updating its previous factorized components rather than recomputing them on the whole data every time the data changed. Experiments show that the proposed methods can offer more effective recommendations than baselines, and significantly improve the efficiency of providing location recommendations. © Springer International Publishing Switzerland 2014.

关键词： Location based services

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Page Query Language Generation for Structural Extraction

Page Query Language Generation for Structural Extraction

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The 2014 10th International Conference on Natural Computation (ICNC 2014) and the 2014 11th International Conference on Fuzzy Systems and knowledge Discovery (FSKD 2014)(第十届自然计算和第十一届模糊系统与知识发现国际会议)

作者： He Hu Xiaoyong Du School of Information Renmin University of China Key Laboratory of Data Engineering and Knowledge EngineeringMOE BeijingChina

ISBN: (纸本)9781479951499

The information on the Web is usually fabricated to be understandable by human users rather than ***'s not easy to automatically catalogue and extract the Web information solely with a software *** on these observations,we present an approach that uses human guided operations to automatically generate a PQL query,a SQL like query language focusing on Web pages,to extract the interested information fragments on Web *** PQL query uses XPath expressions to locating the target HTML *** develop a K-Medoid clustering algorithm to process PQL queries to generate the structural *** extracted information is structured as a relational table(in CSV format)which can be manipulated smoothly with spreadsheet software or a relational DBMS system.

关键词： PQL Structural Extraction Browser Extension

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DCFl-Checker： Checking Kernel Dynamic Control Flow Integrity with Performance Monitoring Counter

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China Communications 2014年第9期11卷 31-46页

作者： SHI Wenchang ZHOU Hongwei YUAN Jinhui LIANG Bin School of Information Renmin University of China Beijing 100872 China Key Lab of Data Engineering and Knowledge Engineering of Ministry of Education (Renmin University of China) Beijing 100872 China Information Engineering University Zhengzhou 450004 China

It is a challenge to verify integrity of dynamic control flows due to their dynamic and volatile nature. To meet the challenge, existing solutions usually implant an ＂attachment＂ in each control transfer. However, the attachment introduces additional cost except performance penalty. For example, the attachment must be unique or restrictedly modified. In this paper, we propose a novel approach to detect integrity of dynamic control flows by counting executed branch instructions without involving any attachment. Our solution is based on the following observation. If a control flow is compromised, the number of executed branch instructions will be abnormally increased. The cause is that intruders usually hijack control flows for malicious execution which absolutely introduces additional branch instructions. Inspired by the above observation, in this paper, we devise a novel system named DCFI- Checker, which detect integrity corruption of dynamic control flows with the support of Performance Monitoring Counter （PMC）. We have developed a proof-of-concept prototype system of DCFI-Checker on Linux fedora 5. Our experiments with existing kemel rootkits and buffer overflow attack show that DCFI- Checker is effective to detect compromised dynamic control transfer, and performance evaluations indicate that performance penaltyinduced by DCFI-Checker is acceptable.

关键词： integrity dynamic control flow kernel branch performance monitoringcounter

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Source separation improves music emotion recognition 14

Source separation improves music emotion recognition

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2014 4th ACM International Conference on Multimedia Retrieval, ICMR 2014

作者： Xu, Jieping Li, Xirong Hao, Yun Yang, Gang Multimedia Computing Lab. School of Information Renmin University of China Beijing 100872 China Key Lab of Data Engineering and Knowledge Engineering Renmin University of China Beijing 100872 China Graduate School of Library and Information Science University of Illinois at Urbana-Champaign United States

ISBN: (纸本)1595930361

Despite the impressive progress in music emotion recognition, it remains unclear what aspect of a song, i.e., singing voice and accompanied music, carries more emotional information. As an initial attempt to answer the question, we introduce source separation into a standard music emotion recognition system. This allows us to compare systems with and without source separation, and consequently reveal the influence of singing voice and accompanied music on emotion recognition. Classification experiments on a set of 267 songs with *** annotations verify the new finding that source separation improves song music emotion recognition. Copyright is held by the owner/author(s).

关键词： Source separation

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Automatic data distribution in large-scale OLTP applications

International Journal of Database Theory and Application

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International Journal of database Theory and Application 2014年第4期7卷 37-46页

作者： Wang, Xiaoyan Fan, Xu Chen, Jinchuan Du, Xiaoyong Key Laboratory of Data Engineering and Knowledge Engineering Renmin University of China MOE Beijing 100872 China School of Information and Electrical Engineering Ludong University Yantai 264025 China School of Information Renmin University of China Beijing 100872 China

With the dramatic increase of data volume, automatic data distribution has been one of the key techniques and intractable problem for distributed systems. This work summarizes the problem of data distribution and abstracts it as a general triangle model called DaWN. Based on data and workload analysis, it presents a novel strategy called ADDS for automatic data distribution in OLTP applications. According to the results of a series of experiments over TPC-C datasets and transactions, the proposed approach shows effective improvements.© 2014 SERSC.

关键词： data handling

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The research on three-dimensional simulation of forest fire by FARSITE for GIS application

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Energy Education Science and Technology Part A: Energy Science and Research 2014年第5期32卷 3231-3240页

作者： Li, Jian Wei Huang, Shiwu Chen, Chongcheng Xu, Qifeng Fuzhou University and Key Lab of Spatial Data Mining & Information Sharing of MOE Spatial Information Research Center FuzhouFujian China Fzuzhou university and College of Physics and Information Engineering FuzhouFujian China

Wildfire spread is a complex process affected by many elements. FARSITE (Fire Area Simulator) is a forest fire spread simulation system widely applied and recognized in the world. This paper briefly describes the principles of the forest fire spread models as well as the instruction and treatment of the data required in FARSITE. The three-dimensional forest fire spread simulation system is then introduced, which uses the OSG (Open Scene Graph) as the three-dimensional graphic engine, the particle system for rendering simulation, and the FARSITE as the calculation engine. The three-dimensional simulation system displays the forest fire spread process in three dimensions, which can be used for predicting the edge of the forest fire and assessing the lose and damage as the burned area, and contributing to a more intuitive understanding of the elements affecting the forest fire spread. © Sila Science. All rights reserved.

关键词： Engines

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Reflection on the popularity of MapReduce and observation of its position in a unified big data platform

Reflection on the popularity of MapReduce and observation of...

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14th International Conference on Web-Age Information Management, WAIM 2013

作者： Qin, Xiongpai Qin, Biao Du, Xiaoyong Wang, Shan MOE Key Lab. of Data Engineering and Knowledge Engineering Beijing 100872 China School of Information Renmin University of China Beijing 100872 China

ISBN: (纸本)9783642395260

In recent years MapReduce has risen to be the de-facto tool for big data processing. MapReduce is a disruptive innovation. It has changed the landscape of database market, the landscape of technologies, as well as the landscape of saying power. The article will give a reflection on the popularity of the technique and some observations of its position in a unified big data platform. © 2013 Springer-Verlag.

关键词： MapReduce

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Renmin University of China at ImageCLEF 2013 scalable concept image annotation

Renmin University of China at ImageCLEF 2013 scalable concep...

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2013 Cross Language Evaluation Forum Conference, CLEF 2013

作者： Li, Xirong Liao, Shuai Liu, Binbin Yang, Gang Jin, Qin Xu, Jieping Du, Xiaoyong Key Lab of Data Engineering and Knowledge Engineering MOE Japan Multimedia Computing Lab School of Information Renmin University of China Zhongguancun Street 59 Beijing100872 China

In this paper we describe our image annotation system par ticipated in the ImageCLEF 2013 scalable concept image annotation task. The system leverages multiple base classifiers, including single feature and multi-feature kNN classifiers and histogram intersection ker nel SVMs, all of which are learned from the provided 250K web images and provided features with no extra manual verification. These base clas sifiers are combined into a stacked model, with the combination weights optimized to maximize the geometric mean of F-samples, F-concepts, and AP-samples metrics on the provided development set. By varying the configuration of the system, we submitted five runs. Evaluation re sults show that for all of our runs, model stacking with optimized weights performs best. Our system can annotate diverse Internet images purely based on the visual content, at the following accuracy level: F-samples of 0.290, F-concepts of 0.304, and AP-samples of 0.380. What is more, a system-to-system comparison reveals that our system and the best sub mission this year are complementary with respect to the best annotated concepts, suggesting the potential for future improvement.

关键词： Image annotation

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Top-k neighborhood dominating query

Top-k neighborhood dominating query

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18th International Conference on database Systems for Advanced Applications, DASFAA 2013

作者： Xie, Xike Lu, Hua Chen, Jinchuan Shang, Shuo Department of Computer Science Aalborg University Denmark Key Labs of Data Engineering and Knowledge Engineering MOE Renmin University of China China

ISBN: (纸本)9783642374869

In many real-life applications, spatial objects are associated with multiple non-spatial attributes. For example, a hotel may have price and rating in addition to its geographic location. In traditional spatial databases, spatial objects are often ranked solely based on their distance to a given query location, e.g., in a nearest neighbor search. In another line of research, domination based skyline queries are used to return best objects according to multi-criteria on non-spatial attributes. In this paper, we study how to rank spatial objects with respect to their non-spatial attributes within their spatial neighborhoods. To enable a general ranking, we design a ranking function that inherits the advantages of dominance relationship and integrates them with spatial proximity. Further, we propose an effective index structure, and a branch and bound solution that executes the ranking efficiently via the index. We conduct extensive empirical studies on real and synthetic datasets. The results demonstrate the high efficiency of our proposal compared to straightforward alternatives. © Springer-Verlag 2013.

关键词： Nearest neighbor search

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Cross-codebook image classification

Cross-codebook image classification

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14th Pacific-Rim Conference on Multimedia, PCM 2013

作者： Liao, Shuai Li, Xirong Du, Xiaoyong Key Lab of Data Engineering and Knowledge Engineering MOE China School of Information Renmin University of China Beijing 100872 China State Key Lab of Software Development Environment Beijing 100191 China

ISBN: (纸本)9783319037301

Representing images by bag of visual codes (BoVC) features has been the cornerstone of state-of-the-art image classification system. Since the BoVC features depend on a precomputed codebook in use, when the codebook applied to test images differs from the codebook of an existing image classification system, the system becomes inapplicable. To resolve the codebook incompatibility problem, we propose in this paper cross-codebook image classification. This is achieved by transforming BoVC features derived from one codebook to make them compatible with another codebook. Two BoVC transform methods, i.e., code-reassignment and least squares, are studied. Experiments on a popular image classification benchmark set show that both methods are better than random guess when crossing the codebooks. In particular, when the BoVC features are transformed from a higher dimension to a relatively small dimension, cross-codebook image classification has a similar performance compared to within-codebook image classification, with a relative performance loss of 1.3% only. The results justify the feasibility of the proposed cross-codebook image classification. © Springer International Publishing Switzerland 2013.

关键词： Image classification

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