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19th Conference on Business Process Management 2011, BPM 2011

作者： Jin, Tao Wang, Jianmin Wen, Lijie Department of Computer Science and Technology Tsinghua University China School of Software Tsinghua University China Key Laboratory for Information System Security Ministry of Education China Tsinghua National Laboratory for Information Science and Technology China

The technology of business process management is being more widely used, and there are more and more business process models. In this demonstration, we show how to query a large number of models efficiently with BeehiveZ. Four types of queries are all supported in BeehiveZ, i.e. exact query based on structure, similarity query based on structure, exact query based on behavior, similarity query based on behavior. BeehiveZ provides different indexes to facilitate the efficient query processing of different types of queries. To make BeehiveZ more applicable, label similarity is considered.

关键词： Enterprise resource management

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Research on the feature extraction of DC space charge behavior of oil-paper insulation

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science China(Technological sciences) 2011年第5期54卷 1315-1324页

作者： TANG Chao LIAO RuiJin CHEN George YANG LiJun College of Engineering and Technology Southwest University Chongqing 400715 China The State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China School of Electronics and Computer Science University of Southampton Southampton SO17 3B J UK

As the ultra high DC voltage grid comes into an important stage in the ‘Twelfth Five-year Plan’ of China, the requirement on the operation safety of power equipment needs to be improved. Oil-paper insulation plays a significant role as the main insulation material of many key power equipments. The space charge behaviors of oil-paper insulation not only affect the dielectric strength, but also relate to the stability and security of power transmission facilities. Until now, the research on the space charge behaviors of oil-paper insulation remains on the stage of objective description and phenomenon explanation, thus it is very urgent to make some feature extractions on the test results in order to further investigate the DC space charge behaviors of oil-paper insulation. In this paper, based on the large numbers of test data in the first stage, data mining and feature extractions were performed on the DC space charge behavior of oil-paper insulation. The variation laws of some key characteristic parameters obtained in different experiment conditions such as the total charge injection amount, apparent charge mobility, and trap energy distribution were analyzed. In addition, the distribution of trapping level inside oil-paper was calculated by using the PEA test results based on the mechanism of the isothermal decay current, which realized the approximate calculation of trap depth by charge decay characteristics. What’s more, the exponential injection and decay equations of DC space charge changing with time were acquired for the first time, and the physical meanings of related parameters were defined. This has laid a foundation for the prediction and simulation of space charge in the oil-paper insulation.

关键词： oil-paper insulation space charge DC feature extraction

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Generating Chinese Named Entity Data from a Parallel Corpus 5

Generating Chinese Named Entity Data from a Parallel Corpus

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5th International Joint Conference on Natural Language Processing, IJCNLP 2011

作者： Fu, Ruiji Qin, Bing Liu, Ting Research Center for Social Computing and Information Retrieval MOE-Microsoft Key Laboratory of Natural Language Processing and Speech School of Computer Science and Technology Harbin Institute of Technology Harbin China

ISBN: (纸本)9789744665645

Annotating Named Entity Recognition (NER) training corpora is a costly process but necessary for supervised NER systems. This paper presents an approach to generate large-scale Chinese NER training data from an English-Chinese discourse level aligned parallel corpus. Difficulty of NER is different among languages due to their unique features. For example, the performance of English NER systems is usually higher than the Chinese ones on average. In our method, we first employ a high performance NER system on one side of a bilingual corpus. And then, we project the NE labels to the other side according to the word level alignment. At last, we select high-quality labeled sentences using different strategies and generate an NER training corpus. In our experiments, we generate a Chinese NER corpus with 167,100 sentences through an English-Chinese parallel corpus. The system trained on the automatically generated corpus attains a comparable result with the one trained on the manually-annotated corpus. Further experiments show that the NER performance is significantly improved on two different evaluation sets by using the generated training data as an additional corpus to the manually-labeled data. © 2011 AFNLP

关键词： Natural language processing systems

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Automatic Web service composition based on Horn clauses and Petri nets

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Expert systems with Applications 2011年第10期38卷 13024-13031页

作者： Tang, Xianfei Jiang, Changjun Zhou, Mengchu Department of Computer Science and Technology Tongji University Shanghai 201804 China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 201804 China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States

This paper introduces an automatic Web service composition method based on logical inference of Horn clauses and Petri nets. The Web service composition problem is transformed into the logical inference problem of Horn clauses by exploring the dependency relations among services. An algorithm is presented, to determine whether the composite service exists in time that is linear in the size of the knowledge base. It can also return the rule set necessary for the composition. Petri nets are chosen to model the rule set and its structural analysis techniques are used to obtain the composite service. © 2010 Elsevier Ltd. All rights reserved.

关键词： Automatic reasoning Knowledge base Petri nets Service composition Web service

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Using random walks for multi-label classification 11

Using random walks for multi-label classification

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20th ACM Conference on Information and Knowledge Management, CIKM'11

作者： Wang, Chaokun Zheng, Wei Liu, Zhang Bai, Yiyuan Wang, Jianmin School of Software Tsinghua University Beijing 100084 China Department of Computer Science and Technology Tsinghua University China Tsinghua National Laboratory for Information Science and Technology China Key Laboratory for Information System Security Ministry of Education China

ISBN: (纸本)9781450307178

The Multi-Label Classification (MLC) problem has aroused wide concern in these years since the multi-labeled data appears in many applications, such as page categorization, tag recommendation, mining of semantic web data, social network analysis, and so forth. In this paper, we propose a novel MLC solution based on the random walk model, called MLRW. MLRW maps the multi-labeled instances to graphs, on which the random walk is applied. When an unlabeled data is fed, MLRW transforms the original multi-label problem to some single-label subproblems. Experimental results on several real-world data sets demonstrate that MLRW is a better solution to the MLC problems than many other existing multi-label classification methods. © 2011 ACM.

关键词： Random processes

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Molecular logic computing model based on self-assembly of DNA nanoparticles

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Chinese science Bulletin 2011年第33期56卷 3566-3571页

作者： ZHANG Cheng YANG Jing XU Jin Institute of Software School of Electronics Engineering and Computer Science Key Laboratory of High Confidence Software Technologies of Ministry of Education Peking University Beijing 100871 China Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

In this paper, a logic computing model was constructed using a DNA nanoparticle, combined with color change technology of DNA/Au nanoparticle conjugates, and DNA computing. Several important technologies are utilized in this molecular computing model: DNA self-assembly, DNA/Au nanoparticle conjugation, and the color change resulting from Au nanoparticle aggregation. The simple logic computing model was realized by a color change, resulting from changing of DNA self-assembly. Based on this computing model, a set of operations computing model was also established, by which a simple logic problem was solved. To enlarge the applications of this logic nanocomputing system, a molecular detection method was developed for H1N1 virus gene detection.

关键词： DNA分子逻辑运算纳米粒子自组装运算模型颜色变化计算模型 DNA计算

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高可扩展的RDF数据存储系统

高可扩展的RDF数据存储系统

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第29届中国数据库学术会议

作者： Yuan Pingpeng 袁平鹏 Liu Pu 刘谱 Zhang Wenya 张文娅 Wu Buwen 吴步文 Key Laboratory of Services Computing Technology and System(Huazhong University of Science and Technology) Ministry of Education Wuhan 430074 服务计算技术与系统教育部重点实验室(华中科技大学) 武汉430074 Key Laboratory of Cluster and Grid Computing of Hubei Province(Huazhong University of Science and Technology)Wuhan 430074 集群与网格计算湖北省重点实验室(华中科技大学) 武汉430074 School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 华中科技大学计算机科学与技术学院武汉430074

由于资源描述框架(resource description framework,RDF)具有表达灵活、简洁等优点,已被接受为表达元数据及万维网上数据互联的规范.近年来,其数据量在以飞快的速度增长.相应地,要求存储RDF数据的系统应具有高扩展性.介绍了一个高可扩展... 详细信息

由于资源描述框架(resource description framework,RDF)具有表达灵活、简洁等优点,已被接受为表达元数据及万维网上数据互联的规范.近年来,其数据量在以飞快的速度增长.相应地,要求存储RDF数据的系统应具有高扩展性.介绍了一个高可扩展的RDF数据存储系统TripleBit.为尽可能降低存储空间消耗,采用了增量压缩和变长整数编码方法.并采用了数据分块的存储方法,既使得存储管理方便又使得存储结构紧凑,加速了数据读取.系统提供了基于启发式规则的动态查询计划生成方法,所产生的查询计划在执行过程中根据中间结果会相应作调整,以保持最优的执行顺序.对于多变量的查询,使用二步执行策略以减少查询过程中产生的中间结果.与目前流行RDF数据存储系统相比较,在存储空间上RDF-3X比TripleBit至少多40％；在查询性能上,比RDF-3X和MonetDB获得数倍的提升.

关键词：数据存储系统资源描述框架数据编码查询处理

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A cloud service cache system based on memory template of virtual machine

Proceedings - 2011 6th Annual ChinaGrid Conference, ChinaGri...

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Proceedings - 2011 6th Annual ChinaGrid Conference, ChinaGrid 2011 2011年 168-173页

作者： Shi, Xuanhua Liu, Chao Wu, Song Jin, Hai Wu, Xiaoxin Deng, Li Services Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China Huawei Technologies Co. Ltd. China

ISBN: (纸本)9780769544724

In data centers and cloud computing environments, the number of virtual machines (VMs) increases when the number of service requests increases. Since services are invoked on demand, the corresponding virtual machines will be created and shut down frequently. This makes the time of starting a virtual machine a crucial performance bottleneck for services in data centers. Besides, if virtual machines read image files from disks to start themselves, additional overhead to access disk will be generated. In this paper, we present a cloud service cache system based on memory template of virtual machines - VCache to improve the response time of cloud computing services, and to reduce the disk access overhead. This system can create and maintain service cache VMs through memory templates, which are snapshots of running virtual machines. By creating virtual machines from cached image files, the ser-vice running in these VMs can be deployed rapidly, which greatly reduces the launching time of the service and disk I/O load. We evaluate our system with experiments, and the experimental results show that the average time for creating a VM is reduced about 80% and the amount of data through disk access decreases more than 50%. © 2011 IEEE.

关键词： Cloud computing

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SelectCast: Scalable data aggregation scheme in wireless sensor networks

SelectCast: Scalable data aggregation scheme in wireless sen...

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IEEE INFOCOM 2011

作者： Wang, Cheng Tang, Shaojie Li, Xiang-Yang Jiang, Changjun Department of Computer Science Tongji University Shanghai China Key Laboratory of Embedded System and Service Computing Ministry of Education Shanghai China Department of Computer Science Illinois Institute of Technology Chicago IL 60616 United States TNLIST School of Software Tsinghua University China

ISBN: (纸本)9781424499212

In this work, for a wireless sensor network (WSN) of n randomly placed sensors with node density λ ∈ [1, n], we study the tradeoffs between the aggregation throughput and gathering efficiency. The gathering efficiency refers to the ratio of the number of the sensors whose data have been gathered to the total number of sensors. Specifically, we design two efficient aggregation schemes, called single-hop-length (SLH) scheme and multiple-hop-length (MLH) scheme. By novelly integrating these two schemes, we theoretically prove that our protocol achieves the optimal tradeoffs, and derive the optimal aggregation throughput depending on a given threshold value (lower bound) on gathering efficiency. Particularly, we show that under the MLH scheme, for a practically important set of symmetric functions called perfectly compressible functions, including the mean, max, or various kinds of indicator functions, etc., the data from Θ(n) sensors can be aggregated to the sink at the throughput of a constant order Θ(1), implying that our MLH scheme is indeed scalable. © 2011 IEEE.

关键词： Efficiency

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Design pattern modeling and implementation based on MDA

Design pattern modeling and implementation based on MDA

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2011 International Conference on Web Information systems and Mining, WISM 2011

作者： Pang, Xuejiao Ma, Kun Yang, Bo Shandong Provincial Key Laboratory of Network Based Intelligent Computing University of Jinan Jinan China School of Computer Science and Technology Shandong University Jinan China

ISBN: (纸本)9783642239816

Model Driven Architecture (MDA) stresses on the model-centric. It defines the framework of the system by using various models. Aiming to increase not only the modeling granularity but also the reusability of model transformation rule we apply the design pattern into MDA. In this paper, firstly, a modeling approach based on role is presented. In this way, the pattern model and the transformation rule can be defined respectively. Secondly, two extended meta-meta-models, ExPattern(Extended Pattern) and ExRole(Extended Role), which are the meta-models of Pattern and Role respectively, are demonstrated in the article. A QVT-based transformation rule is defined for the snake of models transformation. At last, a case study of Graduate Education Management system which uses the technologies proposed in this paper is demonstrated. © 2011 Springer-Verlag.

关键词： Reusability

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