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31st Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, ACM SIGIR 2008

作者： Zhang, Min Ye, Xingyao State Key Lab of Intelligent Tech.and Sys Dept. of Computer Science Tsinghua University Beijing 100084 China School of Software Tsinghua University Beijing 100084 China

ISBN: (纸本)9781605581644

Opinion retrieval is a task of growing interest in social life and academic research, which is to find relevant and opinionate documents according to a user's query. One of the key issues is how to combine a document's opinionate score (the ranking score of to what extent it is subjective or objective) and topic relevance score. Current solutions to document ranking in opinion retrieval are generally ad-hoc linear combination, which is short of theoretical foundation and careful analysis. In this paper, we focus on lexicon-based opinion retrieval. A novel generation model that unifies topic-relevance and opinion generation by a quadratic combination is proposed in this paper. With this model, the relevance-based ranking serves as the weighting factor of the lexicon-based sentiment ranking function, which is essentially different from the popular heuristic linear combination approaches. The effect of different sentiment dictionaries is also discussed. Experimental results on TREC blog datasets show the significant effectiveness of the proposed unified model. Improvements of 28.1% and 40.3% have been obtained in terms of MAP and p@10 respectively. The conclusion is not limited to blog environment. Besides the unified generation model, another contribution is that our work demonstrates that in the opinion retrieval task, a Bayesian approach to combining multiple ranking functions is superior to using a linear combination. It is also applicable to other result re-ranking applications in similar scenario. Copyright 2008 ACM.

关键词： Sentiment analysis

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Towards multi-dimensional separating of NFRs in software architecture

Towards multi-dimensional separating of NFRs in software arc...

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International Conference on computer Science and software engineering, CSSE 2008

作者： Zhang, Lin-Lin Ying, Shi Ni, You-Cong Wen, Jing Zhao, Kai Ye, Peng The State Key Lab of Software Engineering Wuhan University Wuhan China School of Information Science and Engineering Xinjiang University Urumqi China Department of Mathematics and Physics Anhui Institute of Architecture and Industry Hefei China College of Computer Science Wuhan University of Science and Engineering Wuhan China

ISBN: (纸本)9780769533360

software architecture design is an important stage in the whole software development lifecycle. Yet non-functional requirements (NFRs) have been afflicted architects for a long time and how to efficiently design and address them also becomes a big headache problem. This paper focuses on the NFRs in architecture and offers a preliminary insight on separating them in a multiple dimensional way. Consequently, it proposes a model named "1+X" for handling NFRs in architecture, including classifying those into 12 dimensions, and then specifying and mapping those into aspects. By this model, architects can easily analyze and handle NFRs during the architecture design for a specific system. © 2008 IEEE.

关键词： software architecture

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Dynamic availability estimation for service selection based on status identification

Dynamic availability estimation for service selection based ...

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IEEE International Conference on Web Services, ICWS 2008

作者： Lingshuang, Shao Lu, Zhang Tao, Xie Junfeng, Zhao Bing, Xie Hong, Mei School of Electronics Engineering and Computer Science Peking University China Key Laboratory of High Confidence Software Technologies Ministry of Education Beijing 100871 China Department of Computer Science North Carolina State University United States

ISBN: (纸本)9780769533100

With the popularity of Service-Oriented Computing, how to construct highly available service-oriented applications is becoming a hot topic in both the research and industry communities. As a fundamental problem in dynamic service selection, availability estimation is challenging because of the dynamic nature of web services. To grasp the dynamic nature of web services, we set up an experimental environment for collecting runtime information of web services. Based on the collected runtime information, we identify several characteristics of service failures and successes, and further define three typical service runtime statuses. Based on these statuses, we propose a novel approach to dynamic availability estimation, which is called Status Identification based Availability Estimation for Service Selection(SIBE). To evaluate our approach, we compare SIBE with other approaches in an experiment of dynamic service selection on the Internet. Experimental results show that SIBE can efficiently improve the success rate of selecting available services. ©2008 IEEE.

关键词： Web services

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Generation and transmission of 86 Gbit/s hybrid polarization-division multiplexed OOK/DPSK signal

Generation and transmission of 86 Gbit/s hybrid polarization...

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Optical Transmission, Switching, and Subsystems VI

作者： Wu, Lin Li, Mingjin Luo, Yazhi Zhang, Fan Chen, Zhangyuan Xu, Anshi State Key Lab. of Advanced Optical Communication Systems and Networks School of Electronic Engineering and Computer Science Peking University Beijing 100871 China

86 Gbit/s hybrid polarization multiplexed OOK/DPSK signal is generated and transmitted at the same wavelength. Clear eye diagrams of demultiplexed OOK and DPSK signals are obtained after transmission over a 106.5 km S... 详细信息

关键词： Amplitude shift keying

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A graph-segment-based unsupervised classification for multispectral remote sensing images

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WSEAS Transactions on Information Science and Applications 2008年第6期5卷 929-938页

作者： Liu, Nana Li, Jingwen Li, Ning School of Electronics and Information Engineering Beihang University Xue Yuan Road No. 37 HaiDian District Beijing China State Key Lab. of Software Development Environment Beihang University Xue Yuan Road No. 37 HaiDian District Beijing China

With more applications of multispectral remote sensing images, how to effectively and correctly make automated classification of multispectral images is still a great challenge. Utilizing both spatial contextual information and spectral information can achieve better classification performance. In order to make better utilization of the spatial contextual information, we apply graph model to the multispectral image, and use graph-based segmentation to produce units of pixels for further classification. In this paper, we present an unsupervised approach for multispectral remote sensing image classification with graph-based segment and fuzzy c-means clustering. Our method mainly involves following steps: First, represent image as graph H = (V, E) based on the feature vector of per pixel and the relationships among neighboring pixels, and segment the graph into groups of sub-regions as basic object units using the effective graph segmentation algorithm. Then according to those global feature vectors of sub-regions, the fuzzy c-means clustering is used to obtain the classification map based on these sub-regions. Experiments shows the results by different segmentation scales, and then turn out that the approach proposed in this paper can achieve better accuracy and efficiency.

关键词： Pixels

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A generic model for multi-dimensional separation of concerns at architecture level

A generic model for multi-dimensional separation of concerns...

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2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008

作者： Zhang, Lin-Lin Ying, Shi Ni, You-Cong Wen, Jing Zhao, Kai Ye, Peng State Key Lab. of Software Engineering Wuhan University Wuhan China School of Information Science and Engineering Xinjiang University Urumqi China Department of Mathematics and Physics Anhui Institute of Architecture and Industry Hefei China College of Computer Science Wuhan University of Science and Engineering Wuhan China

ISBN: (纸本)9781424421084

software architecture design is an important stage in the whole software development lifecycle. There are so many various concerns at architecture level which relate to all kinds of stakeholders and describe the all facets of problem domain. Unfortunately, they often tangle and scatter in the components and connectors, result in the final architecture solutions uneasy to evolve and reuse. So in this paper, we propose a generic model named "1+X" which can separate the concern at architecture level along multiple dimensions. Also, we provide specification for each dimension and concerns in a dimension. This makes it possible to effectively cope with the crosscutting concerns at architecture level, encapsulate those using aspects or design decisions in the later architecture design activities. © 2008 IEEE.

关键词： software design

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Competition and Cooperation in Mainstream software Evolution

Competition and Cooperation in Mainstream Software Evolution

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IEEE International Workshop on Semantic Computing and Systems, WSCS

作者： Guisheng Chen Jin Liu Junfeng Wang Bing Li Xuhui Li The State Key Lab of Software Engineering Wuhan University of China China School of Computer Sichuan University China

ISBN: (纸本)9780769533162

software features can be the perception of the influence of the human factors on software artifacts. This paper tends to investigate mainstream software evolution and perceive primary criterions of competition and cooperation. It proposes and examines three hypotheses. The active resource space ARS is proposed to manage software features and enhance the success potential of emerging software. Our work makes possible embodying value-added semantic service for software design to meet the merging interconnection environment.

关键词： software feature software evolution Competition Cooperation software evolution Competition computer software Human factors computer programs

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Loss temporal dependency characteristic inference in wireless sensor network

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Journal of Computational Information Systems 2008年第5期4卷 2303-2308页

作者： Li, Yongjun Ji, Wenli Dai, Yafei Computer Networks and Distributed Systems Laboratory Peking University Beijing 100871 China School of Computer Science Northwestern Polytechnical University Xi'an 710072 China School of Communication Engineering Xi'an University of Science and Technology Xi'an 710075 China State Key Lab. for Adv. Opt. Commun Syst and Networks Beijing 1000871 China

The internal link loss characteristic inference has become an increasingly important issue for operating and evaluating a wireless sensor network. Due to the inherent stringent bandwidth and energy constraints, it is usually impractical to directly collect link loss statistical data from each node in sensor network. Here we consider the problem of inferring the internal link loss characteristics from end-to-end measurement. We use the Gilbert error model to model the sensor link losses, formulate the problem of link loss characteristics estimation as a Bayesian inference problem, and propose a Markov Chain Monte Carlo (MCMC) algorithm to solve it. The simulation shows that the link loss performance parameters can be inferred accurately, and the proposed algorithm scales well according to the sensor network size. © 2008 Binary Information Press.

关键词： Inference engines

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Bus Arbitration Mechanism in Embedded System Based on Trust Computing

Bus Arbitration Mechanism in Embedded System Based on Trust ...

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International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Bo Zhao Quan Xiong Huanguo Zhang Xiaongli Huang State Key Lab of Software Engineering Whhan University Hubei China Computer School Wuhan University Hubei China

This paper proposes a starriness start-up mechanism in trusted embedded system, a bus arbitration method to implement this mechanism is also designed. At last, we implement this arbitration mechanism in concrete proto... 详细信息

关键词： Embedded system Embedded computing Protection Kernel Control systems Concrete Physics computing computer networks Hardware computer architecture

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A reflection-based approach for reusing software architecture

A reflection-based approach for reusing software architectur...

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2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008

作者： Ye, Peng Ying, Shi Yuan, Wen-Lie Yao, Jun-Feng Luo, Ju-Bo Zhang, Lin-Lin State Key Laboratory of Software Engineering Wuhan University Wuhan Hubei 430072 China College of Computer Science Wuhan University of Science and Engineering Wuhan Hubei 430074 China School of Information Science and Engineering Xinjiang University Urumqi Xinjiang 830046 China

ISBN: (纸本)9781424421084

Reusing software architecture, which is a kind of coarse-grained software resources at design time, is always a very difficult problem in the realm of software engineer. We consider that the lack of information and techniques, which support the process of reusing software architecture, may result in this problem. So this paper proposes an approach, called ArchBean, which can provide information and technical support for the reuse of architectural level design. ArchBean includes two important basic constituents: RIM4RSA - reflective information model for reusing software architecture and R-ADL. In this paper, we firstly introduce RIM4RSA which can provide information support for creation of reusable architecture resource by modeling architectural information and meta -information. Then we illustrate an architecture description language, called R-ADL, which can provide technical support for description of the reusable software architecture constructed in term of RIM4RSA. Moreover, we demonstrate the main implementation processes of ArchBean. © 2008 IEEE.

关键词： software architecture

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