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From subjects to concept clouds-Why semantic mapping is necessary

From subjects to concept clouds-Why semantic mapping is nece...

引用

1st International Workshop on knowledge Federation 2008

作者： Thomas, Hendrik Markscheffel, Bernd Redmann, Tobias Department of Information-and Knowledge Management TechnischeUniversität Ilmenau P.O. Box 100565 98693 Ilmenau Germany Knowledge / Data Engineering Group School of Computer Science and Statistics Trinity College Dublin Ireland

To realize the vision of the semantic web it is essential to be able to exchange formal modeled knowledge between applications and humans without loss of meaning. In this paper, we focus on questions relating to meaning, interpretation and subject identity in modern semantic web languages. Based on the semiotic triangle we show that topics as well as RDF resources are symbols, representing concepts and not referents as the common term "subject" would indicate. A subject can not be represented as a single entity, but rather as a complex and evolving system of different concepts. Based on this insight we explain how the resulting plurality and uncertainness of the interpretation of symbols can be handled using semantic mappings. By defining transformation rules, the exchange and integration of knowledge from different semantic models becomes possible. Concluding we define recommendations and design guidelines for a semantic mapping management system, which is needed to support users and applications in creating, reusing, managing and applying such semantic mappings.

关键词： Mapping

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Extended pawlak's flow graphs and information theory

Extended pawlak's flow graphs and information theory

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作者： Liu, Huawen Sun, Jigui Zhang, Huijie Liu, Lei College of Computer Science and Technique Jilin University Changchun 130012 China Key Laboratory of Symbolic Computation and Knowledge Engineering Ministry of Education Changchun 130012 China Department of Computer Science Northeast Normal University Changchun 130021 China

ISBN: (纸本)3642020968

Flow graph is an effective and graphical tool of knowledge representation and analysis. It explores dependent relation between knowledge in the form of information flow quantity. However, the quantity of flow can not exactly represent the functional dependency between knowledge. In this paper, we firstly present an extended flow graph using concrete information flow, and then give its interpretation under the framework of information theory. Subsequently, an extended flow graph generation algorithm based on the significance of attribute is proposed in virtue of mutual information. In addition, for the purpose of avoiding over-fitting and reducing store space, a reduction method about this extension using information metric has also been developed. © 2009 Springer Berlin Heidelberg.

关键词： Decision theory

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Rule-based workflow validation of hierarchical service level agreements

Rule-based workflow validation of hierarchical service level...

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2009 Workshops at the Grid and Pervasive Computing Conference, GPC 2009

作者： Ul Haq, Irfan Paschke, Adrian Schikuta, Erich Boley, Harold Department of Knowledge and Business Engineering University of Vienna Austria Institute of Computer Science Freie University Berlin Germany Institute of Information Technology National Research Council Canada

ISBN: (纸本)9780769536774

Business-to-business workflow interoperation across Virtual Organisations (VOs) brings about possibilities for novel business scenarios. In such business scenarios, parts of workflows corresponding to different partners can be aggregated in a producer-consumer manner, making hierarchical structures of added value. Service Level Agreements (SLAs), which are contracts between service providers and service consumers, guarantee the expected quality of service (QoS) to different stake holders at various levels in this hierarchy. This hierarchical SLA choreography and aggregation poses new challenges regarding its description, management, maintenance, validation, trust and security. In this paper we focus on the design and assessment of an agent-enabled, rule-based validation framework for the hierarchical SLA aggregation, corresponding to cross-VO workflow cooperation. © 2009 IEEE.

关键词： Quality of service

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Conceptual modeling: Past, present and the continuum of the future

Conceptual modeling: Past, present and the continuum of the ...

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作者： Roussopoulos, Nick Karagiannis, Dimitris Department of Computer Science University of Maryland College Park MD 20742 United States Department of Knowledge and Business Engineering University of Vienna Brünner Strasse 72 1210 Vienna Austria

ISBN: (纸本)3642024629

In this paper we give a brief history on conceptual modeling in computer science and we discuss state-of-the-art approaches. It is claimed that a number of problems remain to be solved. "Schema-first" is no longer a viable approach to meet the data needs in the dynamic world of the internet and web services. This is also true for the "schema-later" approach simply because data and data sources constantly change in depth and breadth and can neither wait for the schema to be completed nor for the data to be collected. As a solution we advocate for a new "schema-during" approach, in which the process of Conceptual Modeling is in a continuum with the operations in the database. © 2009 Springer Berlin Heidelberg.

关键词： Web services

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Evaluating multi-model (metadata-semantic) information retrieval system

Evaluating multi-model (metadata-semantic) information retri...

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2009 International Conference on Artificial Intelligence, ICAI 2009

作者： Zhuhadar, Leyla Nasraoui, Olfa Wyatt, Robert Romero, Elizabeth Knowledge Discovery and Web Mining Lab. Department of Computer Engineering and Computer Science University of Louisville Louisville KY 40292 United States Office of Distance Learning Western Kentucky University Bowling Green KY 42101 United States

ISBN: (纸本)9781601321091

In this paper, we present a variety of methods to evaluate a multi-model information retrieval system. The evaluation methods are divided into three steps: (1) evaluating a metadata driven search engine, (2) evaluating a personalized cluster-based semantic search engine, and (3) evaluating a dual representation of the semantic user profile for personalized Web search in an evolving domain. The first part of this paper presents an overview of the most popular information retrieval models and their evaluation methods. The second part is dedicated to the specific evaluation methods that we used to evaluate each model of our platform. This platform is already being used by online students at WKU. As of 2006 the "HyperManyMedia" search engine has been ranked number 24 on "The Ultimate Guide to Using Open Courseware 1" (between Cambridge University and Harvard Business).

关键词： Search engines

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Visual Ontology-Based Information Retrieval System

Visual Ontology-Based Information Retrieval System

引用

International Conference on Information Visualisation (IV)

作者： Leyla Zhuhadar Olfa Nasraoui Robert Wyatt Knowledge Discovery and Web Mining Lab Department of Computer Engineering and Computer Science University of Louisville KY USA

The semantic Web has been evolved as a key technology, bringing new insights and solutions to well documented problems in e-learning. The research field of semantic e-learning covers a wide range of research problems. In this paper, we present an approach to visualize an ontology driven information retrieval system in the context of E-learning. This approach has been implemented on the HyperManyMedia platform, and is already being used by online students at WKU. The design of this work is based on the following steps: (1) presenting the HyperManyMedia domain as a tree consisting of concepts and subconcepts where the leaves are the documents (lectures), (2) embedding Nutch search engine into the platform, (3) reconfiguring Nutch search engine to accommodate the semantic search, (4) using Prefuse as a visual tool to present the ontology as a graph, and (5) embedding the graph into the platform as an applet so that learners can navigate visually through the ontology of the domain by clicking on nodes.

关键词： Ontologies Information retrieval Electronic learning Semantic Web Search engines Visualization Navigation knowledge engineering Taxonomy Educational institutions

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An extended multi-layered blackboard approach for the optimization of world-spanning query execution plans

An extended multi-layered blackboard approach for the optimi...

引用

International Conference for Internet Technology and Secured Transactions (ICITST)

作者： Peter Paul Beran Erich Schikuta Faculty of Computer Science Department of Knowledge and Business Engineering University of Technology Vienna Vienna Austria

New application domains ranging from the area of computational science (e.g. CERN Datagrid) to international business processes (e.g. Wal-Mart logistics) demand ever increasing storage capacities on a global scale. Therefore the ability to query and access data efficiently is one of the major challenges that drive research and development in the area of wide distributed data management. Due to the situation of a huge variety of underlying heterogeneous and homogenous infrastructures, where each showing specific hard- and software resources and a number of possible data sources, the optimization of the access process to the desired data is a challenging task. Hence, this paper introduces a novel heuristic approach for the optimization of query execution plans (QEP) on a global scale based on an extended multi-layered blackboard mechanism to determine which available (1) data, (2) resources, and (3) operations to use. The proposed method is illustrated by an application scenario of finding an optimal QEP for the retrieval of music information from an online music store.

关键词： Distributed databases Parallel processing Database systems Peer to peer computing Acceleration computer science knowledge engineering Application software Logistics Drives

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Incremental computation for MEDIAN cubes in what-if analysis

Incremental computation for MEDIAN cubes in what-if analysis

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Joint International Conference on Advances in Data and Web Management, APWeb/WAIM 2009

作者： Xiao, Yanqin Zhang, Yansong Wang, Shan Chen, Hong Key Laboratory of Data Engineering and Knowledge Engineering Renmin University of China MOE Beijing 100872 China School of Information Renmin University of China Beijing 100872 China Computer Center Hebei University Baoding Hebei 071002 China Department of Computer Science Harbin Finance College Harbin 150030 China

ISBN: (纸本)9783642006715

What-if analysis is an important type of DSS analysis processing procedure. It analyzes hypothetical scenarios based on historical data. The data cube view must be updated when the what-if condition is changed. Since source data must be kept in order to compute the new aggregate value when new tuples are inserted or deleted, in what-if analysis, incrementally computing a data cube for holistic aggregation functions is a difficult problem. In this paper, we adopt delta cube strategy and work area technique to incrementally compute data cube for MEDIAN function. The size of work area has important influence on the efficiency of the incremental computing. This paper optimizes the size of work area based on the number and the cardinality of dimension attributes of the cuboid. Performance study shows that our algorithms are effective over large databases. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Geometry

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Efficient incremental computation of CUBE in multiple versions what-if analysis

Efficient incremental computation of CUBE in multiple versio...

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Joint International Conference on Advances in Data and Web Management, APWeb/WAIM 2009

ISBN: (纸本)9783642006715

What-if analysis is an important method to analyze the hypothetical scenarios based on the historical data. It provides useful information for the decision- maker. Multiple versions are critical to what-if analysis. In this paper, we analyze the problem of multiple versions data processing and the incremental computation of cubes in what-if analysis, proposing a strategy to process multiple versions of what-if data. Our solution can adopt different data processing methods according to the type of aggregate functions, the efficiency of multiple versions data processing is improved. Furthermore, we proposes an algorithm of incremental computation of CUBE for max(min) function to reduce the access time of fact table, and the experimental results showed that the performance is improved about 10%. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Decision making

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Fuzzy multiresolution neural networks

Fuzzy multiresolution neural networks

引用

International Conference on Artificial Intelligence and Computational Intelligence, AICI 2009

作者： Ying, Li Qigang, Shang Na, Lei Symbol Computation and Knowledge Engineer Lab. of Ministry of Education College of Computer Science and Technology China Department of Mechanical and Engineering Academy of Armored Force Engineering Beijing China Department of Mechanical and Engineering Academy of Armored Force Technology Changchun China College of Mathematics China Jilin University Changchun 130021 China

ISBN: (纸本)3642052525

A fuzzy multi-resolution neural network (FMRANN) based on particle swarm algorithm is proposed to approximate arbitrary nonlinear function. The active function of the FMRANN consists of not only the wavelet functions, but also the scaling functions, whose translation parameters and dilation parameters are adjustable. A set of fuzzy rules are involved in the FMRANN. Each rule either corresponding to a subset consists of scaling functions, or corresponding to a sub-wavelet neural network consists of wavelets with same dilation parameters. Incorporating the time-frequency localization and multi-resolution properties of wavelets with the ability of self-learning of fuzzy neural network, the approximation ability of FMRANN can be remarkable improved. A particle swarm algorithm is adopted to learn the translation and dilation parameters of the wavelets and adjusting the shape of membership functions. Simulation examples are presented to validate the effectiveness of FMRANN. © 2009 Springer-Verlag.

关键词： Fuzzy neural networks

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