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The tradeoff of delta table merging and re-writing algorithms in what-if analysis application

The tradeoff of delta table merging and re-writing algorithm...

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

作者： Zhang, Yansong Zhang, Yu Xiao, Yanqin Wang, Shan Chen, Hong Key Laboratory of the 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 Department of Computer Science Harbin Finance College Harbin 150030 China Computer Center Hebei University Baoding Hebei 071002 China

ISBN: (纸本)9783642006715

What-if analysis can provide more meaningful information than classical OLAP. Multi-scenario hypothesis based on historical data needs efficient what-if data view support. In general, delta table for what-if analysis is more general than other solutions such as query re-writing prototype of Sesame. Delta table is independent of base table and is more suitable to represent complex hypothetical updates and multi-version hypothetical updates. Due to low efficiency of traditional delta table merging algorithm which is based on set operation, there are few researches focus on delta table merging algorithm but on query re-writing algorithm. By analyzing the difference between what-if query and what-if analysis and improving the delta table merging algorithm, we propose novel algorithms without set operation of difference. Considering the feature of aggregate operations in OLAP analysis, pre-merge algorithm is presented without the generation of what if data view before group-bys in the scenario of SUM, AVERAGE and COUNT function OLAP queries. In our experiments, the pre-merge algorithm greatly improved the efficiency of delta table merging procedure which is close to base group-by statement and superior to the re-writing algorithm. A complete comparison between all candidate delta table merging algorithms and re-writing algorithm with different what-if update conditions of update, deletion, insertion and mixed what-if updates is exhibited in our experiments, the policy of what-if analysis among different types is also discussed. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Merging

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Adaptive Tourism Modeling and Socialization System

Adaptive Tourism Modeling and Socialization System

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IEEE International Conference on Computational science and engineering, CSE

作者： Bruno Coelho Constantino Martins Ana Almeida GECAD-Knowledge Engineering and Decision Support Group Computer Science Department Institute of Engineering Polytechnic of Porto Porto Portugal

This paper presents an undertaken research work about the development of an Adaptive Tourism Modeling System which attempts to correctly model a tourism Web application user profile. This paper will follow the methodology used behind the concept of the application, `User Modeling as a process', which consists of three specific modules in order to achieve a clear user modeling technology. The user representation module devises a collection of knowledge representation formalisms that co-exist in order to constitute the system's view of the user; the user reasoning module is responsible for the execution of several inference tasks as well as the generation of possibly new and valuable information about the user, using the latter module. The user concept that comes out of these two modules will ultimately be used by various kinds of application-level systems, namely a recommender system, therefore instantiating a project-dependent third module.

关键词： knowledge engineering Recommender systems Artificial intelligence computer science Adaptive systems Application software knowledge representation Adaptation model Monitoring Decision support systems

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Efficient Algorithm for Computing Link-Based Similarity in Real World Networks

Efficient Algorithm for Computing Link-Based Similarity in R...

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IEEE International Conference on data Mining (ICDM)

作者： Yuanzhe Cai Gao Cong Xu Jia Hongyan Liu Jun He Jiaheng Lu Xiaoyong Du Key Laboratories of Data Engineering and Knowledge Engineering Ministry of Education China Department of Computer Science Renmin University of China China Department of Computer Science University of Aalborg Denmark Department of Management Science and Engineering Tsinghua University China

Similarity calculation has many applications, such as information retrieval, and collaborative filtering, among many others. It has been shown that link-based similarity measure, such as SimRank, is very effective in characterizing the object similarities in networks, such as the Web, by exploiting the object-to-object relationship. Unfortunately, it is prohibitively expensive to compute the link-based similarity in a relatively large graph. In this paper, based on the observation that link-based similarity scores of real world graphs follow the power-law distribution, we propose a new approximate algorithm, namely Power-SimRank, with guaranteed error bound to efficiently compute link-based similarity measure. We also prove the convergence of the proposed algorithm. Extensive experiments conducted on real world datasets and synthetic datasets show that the proposed algorithm outperforms SimRank by four-five times in terms of efficiency while the error generated by the approximation is small.

关键词： computer networks Collaboration data engineering knowledge engineering computer science Iterative algorithms Filtering data mining Helium computer science education

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Integrating archaeological literature into resource discovery interfaces using natural language processing and name authority services

Integrating archaeological literature into resource discover...

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IEEE International Conference on E-science Workshops

作者： S. Jeffrey J. Richards F. Ciravegna S. Waller S. Chapman Z. Zhang Archaeology Data Service Department of Archaeology The Kings Manor University of York UK Web Intelligence Technologies Laboratory Information and Knowledge OAK Group Department of Computer Science University of Sheffield UK

There exists a large and underutilized resource of archaeological literature, both formal, such as scholarly journals and less formal in the form of `grey literature'. In the archaeological domain the vast majority of this literature contains some geo-spatial element as well as the expected temporal information and therefore its ease of discovery would be greatly enhanced were it accessible via a geo-spatially enabled search mechanism. As a result of this, geo-referencing these types of material and integrating them with other resources, such as monument inventories, is seen as a desirable enhancement for digital archives serving the archaeological research community. This paper provides an overview of a number of the approaches to the integration of such legacy literature into geospatial search mechanisms in an archaeological context. In particular efforts to achieve this via the Archaeotools e-science project and its use of natural language processing and a geo-spatial cross-walk service are discussed as well as potential future enhancements to the process.

关键词： Natural language processing computer science Potential well Education Nuclear magnetic resonance Local government Conferences data mining Cities and towns

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Track me! a web based location tracking and analysis system for smart phone users

Track me! a web based location tracking and analysis system ...

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International International Symposium on computer and Information sciences (ISCIS)

作者： Murat Ali Bayir Murat Demirbas Ahmet Cosar Ubiquitous Computing Laboratory Computer Science & Engineering Suny at Buffalo Buffalo NY USA Intelligent Data Analysis Group Department of Computer Engineering Middle East Technical University Ankara Turkey

Mobility information of cell phone users is very important for wide range of applications, including context-based search and advertising, early warning systems, city-wide sensing applications such as air pollution exposure estimation and traffic planning. With the inclusion of new technologies in the cell phone hardware such as built-in GPS and 802.11 supports, mobility information are easily captured, managed and forwarded to a remote system via opportunistic connections over Internet. However, it is very difficult to use these low level location data for practical applications due to lack of sufficient information including high level location and temporal data. In order to solve this problem, we propose a Web based mobility analysis system which collects location data from cell phone users via opportunistic Internet connections and convert these low level location data to high level mobility information as well as adding a temporal dimension. In our experiments, we have illustrated the benefits of our systems on the reality mining data set which contains 350 K hours of real cell tower connection data.

关键词： Smart phones Cellular phones Internet Advertising Alarm systems Air pollution Hardware Global Positioning System Technology management Information analysis

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Reports of the AAAI 2009 spring symposia

Reports of the AAAI 2009 spring symposia

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作者： Bao, Jie Bojars, Uldis Choudhury, Tanzeem Ding, Li Greaves, Mark Kapoor, Ashish Louchart, Sandy Mehta, Manish Nebel, Bernhard Nirenburg, Sergei Oates, Tim Roberts, David L. Sanfilippo, Antonio Stojanovic, Nenad Stubbs, Kristen Thomaz, Andrea L. Tsui, Katherine Woelfl, Stefan Tetherless World Constellation Rensselaer Polytechnic Institute United States Social Software Unit of DERI Galway Ireland Computer Science Department Dartmouth College United States Knowledge Systems at Vulcan Inc United States Adaptive Systems and Interaction Group Microsoft Research Redmond United States School for Mathematics and Computer Sciences Heriot-Watt University United Kingdom School ot Interactive Computing Georgia Institute of Technology United States Department of Computer Science University of Freiburg Germany Computer Science and Electrical Engineering Department University of Maryland Baltimore County United States Pacific Northwest National Laboratory Richland WA United States University of Karlsruhe Germany IRobot Corporation United States University of Massachusetts Lowell United States

The Association for the Advancement of Artificial Intelligence, in cooperation with Stanford University's department of computer science, was pleased to present the 2009 Spring Symposium Series, held Monday through Wednesday, March 23-25, 2009, at Stanford University. The titles of the nine symposia were Agents That Learn from Human Teachers, Benchmarking of Qualitative Spatial and Temporal Reasoning Systems, Experimental Design for Real- World Systems, Human Behavior Modeling, Intelligent Event Processing, Intelligent Narrative Technologies II, Learning by Reading and Learning to Read, Social Semantic Web: Where Web 2.0 Meets Web 3.0, and Technosocial Predictive Analytics. The goal of the Agents That Learn from Human Teachers symposium was to investigate how we can enable software and robotics agents to leam from real-time interaction with an everyday human partner. The aim of the Benchmarking of Qualitative Spatial and Temporal Reasoning Systems symposium was to initiate the development of a problem repository in the field of qualitative spatial and temporal reasoning and identify a graded set of challenges for future midterm and long-term research. The Experimental Design symposium discussed the challenges of evaluating AI systems. The Human Behavior Modeling symposium explored reasoning methods for understanding various aspects of human behavior, especially in the context of designing intelligent systems that interact with humans. The Intelligent Event Processing symposium discussed the need for more Al-based approaches in event pro-cessing and defined a kind of research agenda for the field, coined as intelligent complex event processing (iCEP). The Intelligent Narrative Technologies IIAAAI symposium discussed innovations, progress, and novel techniques in the research domain. The Learning by Reading and Learning to Read symposium explored two aspects of making natural language texts semantically accessible to, and processable by, machines. The Social Semantic

关键词： Benchmarking

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SimCon: A tool for modeling context sources for rapid evaluation of pervasive applications using virtual reality 5

SimCon: A tool for modeling context sources for rapid evalua...

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5th International ICST Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services, MobiQuitous 2008

作者： McGlinn, Kris O'Neill, Eleanor Lewis, David Knowledge and Data Engineering Group Department of Computer Science Trinity College Dublin Dublin 2 Ireland

Here we present the SimCon tool to enable evaluators of pervasive applications to rapidly place and configure context sources within a Virtual Reality Environment to conduct repeatable evaluations early in the develop... 详细信息

ISBN: (纸本)9789639799219

关键词： Ubiquitous computing

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Semantic interoperation to support context in adaptive applications

Semantic interoperation to support context in adaptive appli...

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2008 IEEE Network Operations and Management Symposium Workshops - NOMS 08

作者： O'Connor, Alexander Wade, Vincent Knowledge and Data Engineering Group School of Computer Science and Statistics Trinity College Dublin 2 Ireland

ISBN: (纸本)9781424420674

The challenge of supporting Ubiquitous Computing is to assist the user by helping their applications make better decisions with better information. Smart spaces and other information sources can provide this information, but it is unrealistic to expect all the information to be represented in the same way everywhere. This means that the goal of ubiquitous computing translates into a problem of information integration. This paper presents a new knowledge-driven approach to applying contextual information to user applications. The objective of the design is to use a semantic integration, represented in topic maps, to deliver knowledge found in available services to personalise and improve the functionality of an integrated application. A brief discussion of the different semantic technologies employed in the system is followed by a presentation of the architecture of the system and its novel combination of semantic technologies. Two Use Cases are discussed, one specifically related to Ubiquitous Environments. Finally, the work is related to other research in the areas of Semantic Mediation and Context Awareness. © 2008 IEEE.

关键词： Ubiquitous computing

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Towards policy decomposition for autonomic systems governance by applying biologically inspired techniques

Towards policy decomposition for autonomic systems governanc...

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2008 IEEE Network Operations and Management Symposium Workshops - NOMS 08

作者： Keeney, John Wade, Vincent Knowledge and Data Engineering Group School of Computer Science and Statistics Trinity College Dublin Dublin 2 Ireland

ISBN: (纸本)9781424420674

Policy-based management systems use declarative rules to govern their operation whilst satisfying the goals of the system. One of the fundamental issues in policy engineering remains the inability to automatically refine high-level goals to low level achievable goals, many of which will be interdependent and conflicting. This paper introduces the automated decomposition and refinement of management policies through the optimisation of balancing constraints by the innovative integration metaheuristic algorithms. © 2008 IEEE.

关键词： Public policy

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Avoiding "big brother" anxiety with progressive self-management of ubiquitous computing services 5

Avoiding "big brother" anxiety with progressive self-managem...

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5th International ICST Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services, MobiQuitous 2008

作者： Feeney, Kevin Lewis, Dave McGlinn, Kris O'Sullivan, Declan Holohan, Anne Knowledge and Data Engineering Group School of Computer Science and Statistics Trinity College Dublin Ireland Department of Sociology Trinity College Dublin Ireland

ISBN: (纸本)9789639799219

Despite the significant research over the last ten years, commercial ubiquitous computing environments and pervasive applications remain thin on the ground. This paper looks at the explosion in application creativity on the internet in recent years - the so-called web 2.0' - in order to identify the obstacles to application creativity in ubiquitous computing. Although technological and standardisation advances are progressively diminishing the scale of the technical problems in the domain, how to manage such applications in such a way so as to encourage user-acceptance remains an open question. It is a question that is particularly difficult due to the serious privacy concerns and the need for negotiated management of services between users due to physically embedded nature of sensor-driven applications. We describe a technical platform which is designed to allow users of ubiquitous computing environments to manage their own personal data and share it in a controlled way and describe an experimental programme to measure the relationship between users' perception of how much control they can exercise over their personal data and their acceptance of ubiquitous computing applications. Copyright © 2008 ICST.

关键词： Ubiquitous computing

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