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B-IRP: An Improving Integrity Report Protocol for Remote Attestation

B-IRP: An Improving Integrity Report Protocol for Remote Att...

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WRI International Conference on Communications and Mobile Computing, CMC

作者： HongWei Zhou JinHui Yuan Key Laboratory of Data Engineering and Knowledge Engineering Ministry of Education Beijing China School of Information Renmin University of China Beijing China Institute of Electronic Technology Zhengzhou Information Engineering University of China Zhengzhou China

Trusted platform module (TPM) has little computation capability, and it is the performance bottleneck of remote attestation. In the scenario where the server is the attestation-busy entity which answers attestation requirement frequently, the massive delay is inevitable. Without the modification to TPM, we propose Batch Integrity Report Protocol (BIRP) to overcome the performance bottleneck. B-IRP bundles these requirements in interval as a batch requirement, and creates the response messages for these requirements with one expensive TPM operation. Discussion shows that B-IRP has improved the performance without loss of security.

关键词： Protocols Servers Security Software Software measurement Computer architecture Delay

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Visual group identification method of technical competitors using LinLog graph clustering algorithm

Visual group identification method of technical competitors ...

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IEEE International Conference on Computer Science and Automation engineering (CSAE)

作者： Hong-qi Han Xiaomi An Donghua Zhu Xuefeng Wang Key Laboratory of Data Engineering and Knowledge Engineering (Renmin University of China) Ministry of Education School of Information Resource Management Beijing 100872 China School of Management and Economics Beijing Institute of Technology 100872 China

Visualization technique is a powerful method used by science and technology intelligence analysis experts to identify technical competitor groups. Common visualization methods tend to create graphs meeting the aesthetic criteria instead of finding better clusters, and their analysis results may provide misleading information. A process model of technical group identification method was presented using LinLog graph clustering algorithm to find better competitor groups. In the model, technical similarity value of each pair of competitors is measured based on their R&D output in sub-fields, and two competitors have a link when they have high similarity value; LinLog algorithm, which is aimed at producing better clusters, was employed to layout graph with competitors as nodes, their links as edges and technology similarity values as weights of edges. Experiment results show the efficiency of presented method.

关键词： Clustering algorithms Patents Algorithm design and analysis Visualization Springs Layout Companies

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基于划分的集合相似连接

基于划分的集合相似连接

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第29届中国数据库学术会议

作者： Rong Chuitian 荣垂田 Xu Tianren 徐天任 Du Xiaoyong 杜小勇 Key Laboratory of Data Engineering and Knowledge Engineering(Renmin University of China) Ministry o 教育部数据工程与知识工程重点实验室(中国人民大学) 北京 100872 中国人民大学信息学院北京 100872 School of Information Renmin University of China Beijing 100872 Key Laboratory of Education Inform 中国人民大学信息学院北京 100872 民族教育信息化教育部重点实验室(云南师范大学) 昆明 650500

集合相似连接(set similarity join)是指在给定的数据集中，按照基于集合间覆盖关系的相似度计算方法来衡量数据之间的相似度、并找出所有相似度不小于给定阈值的数据对的操作。集合相似连接作为一种新的基本操作在很多领域中有重要应... 详细信息

集合相似连接(set similarity join)是指在给定的数据集中，按照基于集合间覆盖关系的相似度计算方法来衡量数据之间的相似度、并找出所有相似度不小于给定阈值的数据对的操作。集合相似连接作为一种新的基本操作在很多领域中有重要应用。随着社会网络、移动应用以及在线服务的发展，使得数据收集的效率和规模得到了很大的提高，同时给相似连接操作带来新的挑战。根据集合相似的必要条件，提出了相似集合之间的差异度。利用差异度和鸽巢原理，提出了一种新颖的基于数据划分的集合相似连接计算方法，该方法对集合进行自适应的均衡划分，并利用基于划分块的过滤方法来提高过滤的效率。为了进一步提高过滤的效果和相似连接的效率，利用划分块的位置信息提出了增强的过滤方法。针对提出的方法，在不同的环境下进行了实验，实验结果表明，该方法与已有的方法相比可以有效地提高相似连接的效率。

关键词：数据库集合相似连接均衡划分法阈值

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FlexTable: Using a Dynamic Relation Model to Store RDF data

FlexTable: Using a Dynamic Relation Model to Store RDF Data

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15th International Conference on database Systems for Advanced Applications

作者： Wang, Yan Du, Xiaoyong Lu, Jiaheng Wang, Xiaofang Key Labs of Data Engineering and Knowledge Engineering Ministry of Education China Information School Renmin University of China China

ISBN: (纸本)9783642120251

Efficient management of RDF data is an important factor in realizing the Semantic Web vision. The existing approaches store RDF data based on triples instead of a relation model. In this paper, we propose a system called FlexTable, where all triples of an instance are coalesced into one tuple and all tuples are stored in relation schemas. The main technical challenge is how to partition all the triples into several tables, i.e. it is needed to design an effective and dynamic schema structure to store RDF triples. To deal with this challenge, we firstly propose a schema evolution method called LBA, which is based on a lattice structure to automatically evolve schemas while new triples are inserted. Secondly, we propose a novel page layout with an interpreted storage format to reduce the physical adjustment cost during schema evolution. Finally we perform comprehensive experiments on two practical RDF data sets to demonstrate that FlexTable is superior to the state-of-the-art approaches.

关键词： FlexTable RDF data dynamic relational model Lattice

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SeCCX: Semantics-based fine granular concurrency control for XML data

SeCCX: Semantics-based fine granular concurrency control for...

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1st International Workshop on Graph database, IWGD 2010, 1st International Workshop on Advanced Techniques on XML data Management, XMLDM 2010, 2nd International Workshop on WCMT 2010, Held in Conj. with WAIM 2010

作者： Rong, Chuitian Lu, Wei Zhang, Xiao Liu, Zhen Du, Xiaoyong Key Labs. of Data Engineering and Knowledge Engineering Ministry of Education China School of Information Renmin University of China China

ISBN: (纸本)3642167195

This paper proposes a new locking protocol, SeCCX, for isolation of concurrent transactions on XML data. This protocol adopts the semantics of operations issued by users. Comparing with previous XML locking protocols, SeCCX has some new features, like richer lock modes, finer granular, lower lock confliction and dynamic lock escalation. The importance is that it locks the objects according to the semantics of user's operation and sets different restrictions on different objects. It provides finer granular concurrency control such that the overall system performance can be improved. We prove that the SeCCX protocol is conflict serializability. We also compare it with other protocols to demonstrate the advantages of SeCCX. © 2010 Springer-Verlag.

关键词： Locks (fasteners)

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Law text clustering based on referential relations

Law text clustering based on referential relations

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5th Annual ChinaGrid Conference, ChinaGrid 2010

作者： Fan, Biao Liu, Tao Hu, He Du, Xiaoyong Key Labs of Data Engineering and Knowledge Engineering Ministry of Education China School of Information Renmin University of China Beijing China

ISBN: (纸本)9780769541068

This paper proposes a new method to cluster law texts based on referential relation of laws. We extract law entities (an entity represents a law) and their referential relation from law texts. Then SimRank algorithm is applied to calculate law entity's similarity through referential relation and law clustering is carried out based on the SimRank similarity. This is the first time to apply SimRank algorithm in the domain of Law and use it to carry out text clustering. Prototype and experiments show that our solution is feasible. We also publish the extracted data as Linked Law data with RDF data model, which forms the first open semantic web database in Law domain. Linked Law data enables user to access law data with rich data links and query web data by application interface of Semantic Web. © 2010 IEEE.

关键词： Cluster analysis

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Query-aware complex object buffer management in XML information retrieval

Query-aware complex object buffer management in XML informat...

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12th International Asia Pacific Web Conference, APWeb 2010

作者： Li, Qiushi Wang, Qiuyue Wang, Shan Key Laboratory of the Ministry of Education for Data Engineering and Knowledge Engineering China School of Information Renmin University of China Beijing 100872 China

ISBN: (纸本)9780769540122

in this paper, we analyse the data access characteristics of a typical XML information retrieval system and propose a new query aware buffer replacement algorithm based on prediction of Minimum Reuse Distance (MRD for short). The algorithm predicts an object's next reference distance according to the retrieval system's running status and replaces the objects that have maximum reuse distances. The factors considered in the replacement algorithm include the access frequency, creation cost, and size of objects, as well as the queries being executed. By taking into account the queries currently running or queuing in the system, MRD algorithm can predict more accurately the reuse distances of index data objects. © 2010 IEEE.

关键词： Search engines

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Detecting Hot Events from Web Search Logs

Detecting Hot Events from Web Search Logs

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11th International Conference on Web-Age Information Management (WAIM 2010)

作者： Gu, Yingqin Cui, Jianwei Liu, Hongyan Jiang, Xuan He, Jun Du, Xiaoyong Li, Zhixu Key Labs. of Data Engineering and Knowledge Engineering Ministry of Education China School of Information Renmin University of China Beijing 100872 China Department of Management Science and Engineering Tsinghua University Beijing 100084 China

ISBN: (纸本)9783642142451

Detecting events from web resources is a challenging task, attracting many attentions in recent years. Web search log is an important data source for event detection because the information it contains reflects users' activities and interestingness to various real world events. There are three major issues for event detection from web search logs: effectiveness, efficiency and the organization of detected events. In this paper, we develop a novel Topic and Event Detection method, TED, to address these issues. We first divide the whole data into topics for efficiency consideration, and then incorporate link information, temporal information and query content to ensure the quality of detected events. Finally, events detected are organized through the proposed interestingness measure as well as topics they belong to. Experiments are conducted on a commercial search engine log. The results demonstrate that our method can effectively and efficiently detect hot events and give a meaningful organization of them.

关键词： Event detection click-through data efficient algorithm

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Parallel SimRank computation on large graphs with iterative aggregation

Parallel SimRank computation on large graphs with iterative ...

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16th ACM SIGKDD International Conference on knowledge Discovery and data Mining, KDD-2010

作者： He, Guoming Feng, Haijun Li, Cuiping Chen, Hong Key Lab. of Data Engineering and Knowledge Engineering of Ministry of Education China Department of Computer Science Renmin University of China China No. 59 Zhongguancun Street Haidian District Beijing China

ISBN: (纸本)9781450300551

Recently there has been a lot of interest in graph-based analysis. One of the most important aspects of graph-based analysis is to measure similarity between nodes in a graph. SimRank is a simple and influential measure of this kind, based on a solid graph theoretical model. However, existing methods on SimRank computation suffer from two limitations: 1) the computing cost can be very high in practice;and 2) they can only be applied on static graphs. In this paper, we exploit the inherent parallelism and high memory bandwidth of graphics processing units (GPU) to accelerate the computation of SimRank on large graphs. Furthermore, based on the observation that SimRank is essentially a first-order Markov Chain, we propose to utilize the iterative aggregation techniques for uncoupling Markov chains to compute SimRank scores in parallel for large graphs. The iterative aggregation method can be applied on dynamic graphs. Moreover, it can handle not only the link-updating problem but also the node-updating problem. Extensive experiments on synthetic and real data sets verify that the proposed methods are efficient and effective. © 2010 ACM.

关键词： Graphics processing unit

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Optimizing queries with expensive video predicates based on estimation of attribute cardinality

Optimizing queries with expensive video predicates based on ...

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International Conference on Multimedia Information Networking and Security

作者： Yu, Lisheng Zhang, Jianmei Wang, Shan Key Laboratory of Ministry of Education for Data Engineering and Knowledge Engineering Renmin University of China Beijing 100872 China School of Information Renmin University of China Beijing 100872 China

ISBN: (纸本)9780769542584

With rapid advances in video processing technologies, video data increased rapidly and becomes popular in our daily life for both professional and consumer applications, e.g., surveillance, education, entertainment. Such needs require the data management system not only can store and access the video content, but also able to optimize the queries with expensive video predications in an effective and efficient way. In previous research literature, query optimizations in relational database systems (RDBMS) are often based on disk I/O cost of involved operations. However, for a query that contains expensive video predicates, traditional cost estimation model does not work well. Although researchers have proposed some approaches which can solve the problem in certain situations, there are still some unresolved issues, and it needs further optimization. In this paper, motivate from a real-world large supermarket's business data and video surveillance data management scenario, through considering the characteristics of video data and its expensive processing, we propose a novel query optimization approach that caches operators' results and reconstructs the join order based estimation for attribute cardinality. This approach reduces the invoking times of expensive video predicate in a greater degree and gives a better solution for mixed query optimization which contains traditional data types and large object operations. The experiment result is satisfactory while compare with existing expensive predicates query optimization methods. © 2010 IEEE.

关键词： Relational database systems

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