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International Conference on Management and Service Science, MASS

作者： Xiaomi An Wang Wang Key Laboratory of Data Engineering and Knowledge Engineering Ministry of Education Renmin University of China Beijing China School of Information Resource Management Renmin University of China Beijing China

Much research has been done on integrated use of ISO management system standards. Integrated use of management systems is identified to have shared values of varied integration impacts on resources efficiency building and sustainable development of business processes. However, little research has been done on integrated use of business continuity management systems (BCMS), records management systems (RMS) and knowledge management systems (KMS). This paper proposes a holistic integration management approach for collaboration, optimization and innovation of the three management systems through mapping/building/operationalizing cycle for supply of efficiency building strategy to the dynamic accumulation, sharing, and exchanges of memory, evidence and knowledge of organization.

关键词： ISO standards Collaboration knowledge management Standards organizations Organizations

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Performance study on logging to another main memory database

Performance study on logging to another main memory database

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International Conference on New Trends in Information and Service Science, NISS

作者： Xiongpai Qin Xiaoyun Zhou Key Laboratory of Data Engineering and Knowledge Engineering School of Information Renmin University of China Beijing 100872 China Department of Computer Science and Technology Xuzhou Normal University Jiangsu 221008 China

In update intensive main memory database applications, huge volume of log records is generated, to maintain the ACID properties of the database system, the log records should be persistent efficiently. Delegating logging of one main memory database to another main memory database is proposed. The scheme is elaborated in detail in terms of architecture, logging & safeness levels, checkpointing, and recovery. Strict durability and relax durability are provided. When some form of non-volatile memory is used to temporarily holding log records, not only logging efficiency is improved, but also the scheme could guarantee full ACID of the system. We also propose using parallel logging to speedup log persistence by writing logs to multiple disks in parallel. Since interconnection network techniques progress by leaps and bounds, the scheme eliminates the concern about whether the system's overall performance may be slowed down by bandwidth and latency limitations. Experiment results demonstrate the feasibility of the proposal.

关键词： Checkpointing database systems Transaction databases Network servers Availability Nonvolatile memory Writing Communication industry Defense industry Wood industry

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Pseudo-relevance feedback driven for XML query expansion

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Journal of Convergence Information Technology 2010年第9期5卷 146-156页

作者： Minjuan, Zhong Changxuan, Wan School of Information Technology Jiangxi University of Finance and Economics Nanchang 330013 China Jiangxi Key Laboratory of Data and Knowledge Engineering Jiangxi University of Finance and Economics Nanchang 330013 China

Pseudo-relevance feedback has been perceived as an effective solution for automatic query expansion. However, a recent study has shown that traditional pseudo-relevance feedback may bring into topic drift and hence be harmful to the retrieval performance. It is often crucial to identify those good feedback documents from which useful expansion terms can be added to the query. Compared with traditional query expansion, XML query expansion needs not only content expansion but also considering structural expansion. This paper presents a solution for both identifying related documents and selecting good expansion information with new content and path constrains. Combined with XML semantic feature, a naïve document similarity measurement is proposed in this paper. Based on this, k-median clustering algorithm is firstly implemented and some related documents are found. Secondly, query expansion is only performed by two steps in the set of related documents, which key phrase extraction algorithm is carried out to expand original query in the first step and the second step is structural expansion based on the expanded key phrases. Finally a full-edged content-structure query expression which can represent user's intention is formalized. Experimental results on IEEE CS collection show that the proposed method can reduce the topic drift effectively and obtain the better retrieval quality.

关键词： Clustering algorithms

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Vulnerabilities Static Detection for Web Applications with False Positive Suppression

Vulnerabilities Static Detection for Web Applications with F...

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2010 IEEE International Conference on Information Theory and Information Security(2010 IEEE 国际信息论与信息安全会议)

作者： Bin Liang Qianqian Wang Jianjun Huang Jiagui Zhong Jingjing Cai Key Laboratory of Data Engineering and Knowledge Engineering (Renmin University of China) MOE Schoo School of Information Renmin University of China Beijing 100872 China Beijing Venustech Cybervision Co. Ltd Beijing 100094 China

Web applications become more and more important, and the corresponding security problems have been concerned about. This paper presents TASA, an ASP static analyzer, which employs a path-sensitive, inter-procedural and contextsensitive data flow analysis, mainly concerning the taint propagation and sanitization. This paper also discusses some techniques used in TASA, such as sanitization routines modeling, ASP specific features, alias analysis and path-related routines modeling, to prune false positives. Experiments on four open source applications show that TASA has a rate of false positive of 4.98% and it can avoid certain false warnings owing to the proposed approaches.

关键词： Security Detectors Computer bugs Portals Analytical models Browsers Merging

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Two novel semantics of top-k queries processing in uncertain database

Two novel semantics of top-k queries processing in uncertain...

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10th IEEE International Conference on Computer and Information Technology, CIT-2010, 7th IEEE International Conference on Embedded Software and Systems, ICESS-2010, 10th IEEE Int. Conf. Scalable Computing and Communications, ScalCom-2010

作者： Liu, Dexi Wan, Changxuan Xiong, N. Yang, Laurence T. Chen, Lei Jiangxi Key Laboratory of Data and Knowledge Engineering School of Information Technology Jiangxi University of Finance and Economics Nanchang China Department of Computer Science Georgia State University Atlanta GA United States Department of Computer Science St. Francis Xavier University Antigonish NS Canada Department of Computer Science HK University of Science and Technology Hong Kong Hong Kong

ISBN: (纸本)9780769541082

Top-k query is a powerful technique in uncertain databases because of the existence of exponential possible worlds, and it is necessary to combine score and confidence of tuples to derive top k answers. Different semantics, the combination methods of score and confidence, lead to different results. U-kRanks and Global Top-k are two semantics of Topk queries in uncertain database, which consider every alternative in x-tuple as single one and return the tuple which has the highest probability appearing at top k or a given rank. However, no matter which alternative (tuple) of an x-tuple appears in a possible world, it undoubtedly believes that this xtuple appears in the same possible world accordingly. Thus, instead of ranking every individual tuple, we define two novel Top-k queries semantics in uncertain database, Uncertain xkRanks queries (U-x-kRanks) and Global x-Top-k queries (Gx- Top-k), which return k entities according to the score and the confidence of alternatives in x-tuple, respectively. In order to reduce the search space, we present an efficient algorithm to process U-x-kRanks queries and G-x-Top-k queries. Comprehensive experiments on different data sets demonstrate the effectiveness of the proposed solutions. © 2010 IEEE.

关键词： Semantics

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Study in retrieval visibility and optical thickness of fog with MODTRAN

Study in retrieval visibility and optical thickness of fog w...

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International Conference on Multimedia Technology

作者： Zhang, Wengang Wei, Ming Yu, Tao Wang, Gengke Lai, Jibao Wang, Yuqing Key Laboratory of Meteorological Disaster of Ministry of Education Earth System Remote Sensing Institute Nanjing University of Information Science and Technology Nanjing 210044 China Center for National Space-borne Demonstration Beijing 100101 China Institute of Data and Knowledge Engineering Henan University Kaifeng Henan 475001 China Binjiang College Nanjing University of Information Science and Technology Nanjing 210044 China

ISBN: (纸本)9781424478743

In recent years, many scientists have done some work in monitoring the fog, and achieved fruitful results. Now we want to conduct more in-depth study. In this paper, we utilize MODTRAN to simulate the relationship between transmittance and visibility, height of fog. By fitting the relationship between them, we get the formula that calculates visibility of fog using transmittance and height of fog. The correlation coefficient of this formula is very high, so it can be regarded as an accuracy one. The height of fog can be calculated by top temperature of fog, surface temperature and vertical lapse rate. The transmittance of the fog can be measured by using special instrument. Therefore, the visibility and optical thickness can be retrieved by this method. ©2010 IEEE.

关键词： Visibility

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Global Top-k Aggregate Queries Based on X-tuple in Uncertain database

Global Top-k Aggregate Queries Based on X-tuple in Uncertain...

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Dexi Liu Changxuan Wan Naixue Xiong Jong Hyuk Park Sang-Soo Yeoe School of Information Technology Jiangxi Key Laboratory of Data and Knowledge Engineering Jiangxi University of Finance and Economics Nanchang China Department of Computer Science Georgia State University Atlanta GA USA Department of Computer Science and Engineering Seoul National University of Technology Seoul South Korea Division of Computer Engineering Mokwon University Daejeon South Korea

ISBN: (纸本)9781424467013;9780769540191

A Top-k aggregate query, which is a powerful technique when dealing with large quantity of data, ranks groups of tuples by their aggregate values and returns k groups with the highest aggregate values. However, compared to Top-k in traditional databases, queries over uncertain database are more complicated because of the existence of exponential possible worlds. As a powerful semantic of Top-k in uncertain database, Global Top-k return k highest-ranked tuples according to their probabilities of being in the Top-k answers in possible worlds. We propose a x-tuple based method to process Global Top-k aggregate queries in uncertain database. Our method has two levels, group state generation and G-x-Top-k query processing. In the former level, group states, which satisfy the properties of x-tuple, are generated one after the other according to their aggregate values, while in the latter level, dynamic programming based Global x-tuple Top-k query processing are employed to return the answers. Comprehensive experiments on different data sets demonstrate the effectiveness of the proposed solutions.

关键词： Aggregates databases knowledge engineering Query processing Computer networks Power engineering computing data engineering Power engineering and energy Dynamic programming Radar imaging

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Studies and implementation of the trusted process mechanism in a secure operating system

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Qinghua Daxue Xuebao/Journal of Tsinghua University 2010年第SUPPL. 1期50卷 1547-1553页

作者： Zhang, Chongbin Li, Fengjuan Liang, Bin China Information Technology Security Evaluation Center Beijing 100085 China Key Laboratory of Data Engineering and Knowledge Engineering of Ministry of Education School of Information Renming University of China Beijing 100872 China

The trusted process mechanism is an important part of the operating system security mechanism, but there is no uniform definition of the trusted process and there are some limitations in understanding its fundamental properties. In this paper, the trustworthiness of a trusted process is discussed in terms of privilege, data-operated integrity, functional and logic correctness, self-integrity, availability and trusted interactions. A trusted process definition is then given which summarizes the fundamental properties of a trusted process as a theoretical foundation for researching and enforcing the trusted process mechanism. A prototype of a trusted process mechanism is implemented in a secure operating system based on Linux, with the trustworthiness of the trusted process assured in many ways to improve and extende the original trust mechanisms in Linux.

关键词： Linux

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Operating system mechanisms for TPM-based lifetime measurement of process integrity

Operating system mechanisms for TPM-based lifetime measureme...

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2009 IEEE 6th International Conference on Mobile Adhoc and Sensor Systems, MASS '09

作者： Xiao, Li Wenchang, Shi Zhaohui, Liang Bin, Liang Zhiyong, Shan Key Laboratory of Data Engineering and Knowledge Engineering (Renmin University) Ministry of Education

ISBN: (纸本)9781424451135

Implementing runtime integrity measurement in an acceptable way is a big challenge. We tackle this challenge by developing a framework called Patos. This paper discusses the design and implementation concepts of our operating system mechanisms for runtime process integrity measurement, which is an important part of the Patos framework and is named Patos-RIP. Patos-RIP is developed into the mainstream Linux operating system and utilizes TPM as hardware support for tamper-resistance. From the beginning a process is created to the moment the process dies, Patos-RIP conducts integrity measurement at appropriate points of time when the process runs, so as to ensure that the integrity of a process is not compromised during its whole lifetime. This way, Patos-RIP can improve trustworthiness of processes by effectively detecting runtime tampering attacks on processes' integrity. ©2009 IEEE.

关键词： Computer operating systems

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Median query research in wireless sensor networks

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Tien Tzu Hsueh Pao/Acta Electronica Sinica 2010年第2A期38卷 133-137页

作者： Wu, Zhong-Bo Zhang, Hui Chen, Hong Information School Renmin University of China Beijing 100872 China Key Laboratory of Data Engineering and Knowledge Engineering Ministry of Education Beijing 100872 China School of Mathematics and Computer Science Xiangfan University Xiangfan Hubei 441053 China

Poor quality and harsh condition can result in faulty and outlier data in sampling data of sensor nodes. So we need median query to reflect average level of monitoring region. First, we put forward HMA algorithm. Second, we extend HMA algorithm and put forward HFMA algorithm. In HFMA, We only need collect data inside filter and aggregate influence coefficient during sampling period. Base station can compute median result according to the sample data inside filter and influence coefficient aggregation value. Experimental results have shown that HFMA outperforms Naive algorithm and HMA algorithm and can prolong the lifetime of sensor network.

关键词： Sensor nodes

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