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Power is information: South Africa's promotion of access to information act in context

Power is information: South Africa's promotion of access to ...

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5th international conference on Conceptions of Library and Information Sciences CoLIS 2005: context: Nature, Impact, and Role

作者： Dick, Archie L. Department of Information Science University of Pretoria Pretoria 0002 South Africa

Information professionals in some developing countries are likely to view 'context' differently from those in developed countries. 'context' becomes even more problematic when the searchers for information are ordinary citizens and the retrieval tool is a piece of national legislation that promotes access to information held by the state and the private sector. these and other difficulties become apparent in a case study of South Africa's Promotion of Access to Information Act (PAIA), of 2000. using this legislation, 'context' is examined from the perspective that power is access to information, which focuses on tensions in the struggle for access. the paper argues that an enabling context or culture of access is just as important as progressive information access legislation in developing countries. And it comments on the 'remote contexts' of Ingwersen and Jarvelin's nested model of context stratification. Ways of extending this model and promoting a culture of access are recommended. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Information retrieval

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Reuse-oriented process component representation and retrieval

Reuse-oriented process component representation and retrieva...

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5th international conference on Computer and Information Technology

作者： Xu, RZ He, T Chu, DS Xue, YJ Qian, LQ Shandong Univ Finance Sch Comp Engn Jinan 250014 PA Peoples R China

ISBN: (纸本)076952432X

this paper proposes a Reuse-Oriented Process Component Representation framework for the description and classification, of Process Components (PCs). the key features of our approach are the division of process component descriptions into a goal-oriented PCs General Information Description (PGD), an implementation-oriented PCs Specification Description (PSD) and an improvement-oriented PCs Data Description (PDD). A facet-based PC classification scheme and an XML-based process description method is presented A retrieval model based on tree-contaminent matching is given, which can improve the recall while maintaining a high level precision. Finally, a reuse based process and project management system (P2MS) to support process improvement and control is also introduced in this paper.

关键词： Project management Process control Programming context modeling Finance Computer science Personal communication networks Control systems Software engineering Software systems

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A vertical handoff decision process and algorithm based on context information in CDMA-WLAN interworking

A vertical handoff decision process and algorithm based on c...

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5th international conference on Computational Science, ICCS 2005

作者： Kim, Jang-Sub Chung, Min-Young Shin, Dong-Ryeol School of Information and Communication Engineering Sungkyunkwan University 300 ChunChun-Dong JangAn-Gu Suwon Korea Republic of

ISBN: (纸本)9783540260431

the integration of WLANs and CDMA networks has recently evolved into a very hot issue. In order to support a vertical handoff, we propose a context based vertical handoff decision process and the corresponding algorithms from WLAN to CDMA system, and vice versa, based on wireless channel assignment. We focuses on the handoff decision which uses context information such as dropping probability, blocking probability, GoS (Grade of Service), the number of handoff attempts and velocity. As a decision criterion, velocity threshold is determined to optimize the system performance. the optimal velocity threshold is adjusted to assign available channels to the mobile stations with various handoff strategies. the proposed scheme is validated using computer simulation. Also, the overflow traffic (a vertical handoff) is evaluated and compared with non-overflow traffics in terms of GoS. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Blocking probability

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5th IFIP WG 6.1 international conference on Distributed Applications and Interoperable Systems, DAIS 2005

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5th IFIP WG 6.1 international conference on Distributed Applications and Interoperable Systems, DAIS 2005

ISBN: (纸本)9783540262626

the proceedings contain 23 papers. the special focus in this conference is on Interoperability architectures, Methodological aspects, Service discovery, Configurable communication, Interoperability architectures II and Performance and optimization. the topics include: Towards real-time middleware for applications of vehicular ad hoc networks;adaptive context management using a component-based approach;customised billing for location-based services;loosely-coupled integration of CSCW systems;interoperability and eservices;model-driven self-management of legacy applications;model-driven methodology for building qos-optimised web service compositions;how to implement software connectors? a reusable, abstract, adaptable connector;designing self-adaptive multimedia applications through hierarchical reconfiguration;transformation composition modelling framework;proximity-based service discovery in mobile Ad Hoc networks;enriching UDDI information model with an integrated service profile;building a configurable publish/subscribe notification service;protocol reconfiguration using component-based design;a secure and efficient communication resume protocol for secure wireless networks;an architecture for collaborative scenarios applying a ommon BPMN-repository;a flexible and modular framework for implementing infrastructures for global computing;an architecture for implementing application interoperation with heterogeneous systems;optimizing the access to read-only data in grid computing and using data item relationships to adaptively select data for synchronization;a client/intercept based system for optimizing wireless access to web services.

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Adaptive Wavelet Difference Reduction using High-Order context modeling for Embedded Image Compression

Adaptive Wavelet Difference Reduction using High-Order Conte...

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international conference on Information, Communications and Signal Processing

作者： P. Lamsrichan T. Sanguankotchakorn Telecommunication Program Asian Institute of Technology Pathumthani Thailand Asian Institute of Technology Bangkok TH

the new embedded algorithm for wavelet image compression is proposed. the main idea of the algorithm is to use high-order statistical context modeling for significant coefficients prediction by scanning order adaptation of wavelet difference reduction (WDR). the new predefined scanning order, header, preprocessing of all-lowpass coefficients are used together with the scanning order adaptation to improve the rate-distortion performance of the image coder, while retain the important features of the state of the art image coder from original WDR, such as embedded/progressive coding, region of interest support, and support operation on compressed data. the high-order context model used can be fixed or adaptive model. Although at the very beginning state, this technique, using simple fixed model, in PSNR sense, considerably surpasses set partitioning in hierarchical trees (SPIHT) in no arithmetic coding mode for all test images at all bit rates, and also outperforms JPEG2000 in high compression ratio (very low to low bit rate) for many images in the test set

关键词： context modeling Image coding Testing Rate-distortion Bit rate Wavelet transforms Wavelet coefficients Electronic mail PSNR Arithmetic

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using ontology to establish social context and support social reasoning

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5th international Working conference on Intelligent Virtual Agents, IVA 2005

作者： Kao, Edward Chao-Chun Chang, Paul Hsueh-Min Chien, Yu-Hung Soo, Von-Wun Institute of Information and System Applications National Tsing Hua University 101 Section 2 Guangfu Road 300 Hsinchu Taiwan Department of Computer Science National Tsing Hua University 101 Section 2 Guangfu Road 300 Hsinchu Taiwan Department of Computer Science National University of Kaohsiung 700 Kaohsiung University Road 811 Kaohsiung Taiwan

ISBN: (纸本)3540287388

Believable agents are required to express human-like characteristics. While most recent research focus on graphics and plan execution, few concentrate on the issue of flexible interactions by reasoning about social relations. this paper integrates the idea of social constraints with social ontology to provide a machine readable framework as a standard model which can support social reasoning for generic BDI agents. A scenario is illustrated to show how social reasoning can be attained even in different social context. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Artificial intelligence

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modeling plants language for definition of L-systems

Modeling plants language for definition of L-systems

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international conference on Intelligent Systems Design and Applications (ISDA)

作者： K. Lukasik E. Hudyma Wroclaw University of Technology Poland

Proper language for formal definition of L-systems is crucial to easy creation, modification and comparison between plant models. this paper introduces special purpose language, which allows effortless description of D0L-systems (simplest class of L-systems) and their extensions (e.g. context-sensitive, parametric productions with probability). the proposed language enables as well specification of high-level model parameters.

关键词： Mathematical model Visualization Stochastic processes Phased arrays Production systems Organisms Graphics Image segmentation context modeling Fractals

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DSFM fitting of implied volatility surfaces

DSFM fitting of implied volatility surfaces

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international conference on Intelligent Systems Design and Applications (ISDA)

作者： S. Borak M. Fengler W. Hardle CASE - Center for Applied Statistics and Economics Humboldt-Universität zu Berlin Berlin Germany Center for Appl. Stat. & Econ. Humboldt-Univ. Berlin Germany

Implied volatility is one of the key issues in modern quantitative finance, since plain vanilla option prices contain vital information for pricing and hedging of exotic and illiquid options. European plain vanilla options are nowadays widely traded, which results in a great amount of high-dimensional data especially on an intra day level. the data reveal a degenerated string structure. Dynamic semiparametric factor models (DSFM) are tailored to handle complex, degenerated data and yield low dimensional representations of the implied volatility surface (IVS). We discuss estimation issues of the model and apply it to DAX option prices.

关键词： Surface fitting Principal component analysis Computer aided software engineering Statistics Finance Economic indicators Time measurement Stochastic processes Cost function context modeling

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Integrating notion of agency and semantics in information retrieval: an intelligent multi-agent model

Integrating notion of agency and semantics in information re...

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international conference on Intelligent Systems Design and Applications (ISDA)

作者： T.J. Siddiqui Department of Electronics & Communication University of Allahabad Allahabad

We present an intelligent information retrieval model based on multi-agent paradigm and conceptual graphs. the growing amount of on-line information and its dynamic nature forces us to reconsider existing passive approaches for information retrieval. Because of this ever-growing size of information sources the burden of retrieving information can not be simply left on users. We attempt to handle this problem through software agents. Our model makes use of a user modeling agent (UMA), a facilitator and integrator (FACINT) module and a number of retrieval agents. UMA is responsible for creating a user profile. Actual retrieval is done by retrieval agents. FACINT is responsible for controlling and coordinating activities of various agents. It also does final ranking of the documents based on conceptual graph (CG) representation of documents. the use of CG brings semantics in making relevance judgment resulting in improved ranking. the model proposed by us is simple, efficient, scalable and can work actively as well as passively.

关键词： Information retrieval Intelligent agent Indexing Character generation Natural languages Physics Information technology Software agents context modeling Educational institutions

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context dynamic and explanation in contextual graphs

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4th international and interdisciplinary conference on modeling and using context (context 2003)

作者： Brézillon, P Univ Paris 06 LIP5 F-75015 Paris France

ISBN: (纸本)3540403809

this paper discusses the dynamic of context through the use of a context-based formalism called contextual graphs that has been initially developed in the SART application for the development of a support system in incident solving on a subway line. First, we present the formalism of contextual graphs through its new implementation. Second, we discuss the dynamic of context in contextual graphs. third, we present two characteristics of contextual graphs as they relate to the dynamic of context, the incremental knowledge acquisition and the explanation generation. We conclude by a discussion of the key properties and the potential of contextual graphs for other applications.

关键词： contextual graphs explanation visual explanations context dynamic applications

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