The amount of structured information available in Internet sources is rapidly increasing. This information includes commercial databases on product information and information on e-services forming the so-called e-sho...
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ISBN:
(纸本)0769510620
The amount of structured information available in Internet sources is rapidly increasing. This information includes commercial databases on product information and information on e-services forming the so-called e-shops. However. the process of using this information has become more complicated, and can sometimes be tedious for users with different goals, interests, levels of expertise, abilities and preferences. This paper deals with the definition of an architectural framework for intelligent, adaptive and personalised navigation within large hypertext Electronic Commerce environments.
We report on the performance of an optimized parallel channel coder for high-speed optical transmission systems. The coding properties are discussed by an evaluation of the signal statistics of the coded pulse train i...
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ISBN:
(纸本)0769510620
We report on the performance of an optimized parallel channel coder for high-speed optical transmission systems. The coding properties are discussed by an evaluation of the signal statistics of the coded pulse train in the time and frequency domain. The discussion is mainly based on the results far the power spectral density (PSD) and the autocorrelation function (AKF). The theoretical investigations have been verified by measurements with a developed 2.488 Gbit/s optical transmission system. Reliability studies have shown a system's bit error rate below 10(-13).
Applications like multimedia databases or enterprise-wide information management systems have to meet the challenge of efficiently retrieving best matching objects from vast collections of data. We present a new algor...
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ISBN:
(纸本)0769510620
Applications like multimedia databases or enterprise-wide information management systems have to meet the challenge of efficiently retrieving best matching objects from vast collections of data. We present a new algorithm Stream-Combine for processing multi-feature queries on heterogeneous data sources. Stream-Combine is self-adapting to different data distributions and to the specific kind of the combining function. Furthermore we present a new retrieval strategy that will essentially speed rtp the output of relevant objects.
We address the problem of robust transmission of compressed visual information over unreliable networks. Our approach employs the principle of multiple-descriptions, through pre- and post-processing of the image data,...
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ISBN:
(纸本)0769510620
We address the problem of robust transmission of compressed visual information over unreliable networks. Our approach employs the principle of multiple-descriptions, through pre- and post-processing of the image data, without modification to the source or channel codecs. We employ oversampling to add redundancy to the original image data followed by a partitioning of the oversampled image into "equal" sub-images which can be coded and transmitted over separate channels. Simulations using two descriptors show that this approach yields exceptional performance when only one descriptor is received and outperforms other popular multiple description approaches.
Fusion of various retrieval strategies has long been suggested as a means of improving retrieval effectiveness. To date, testing effusion was done by combining result sets from widely disparate approaches that include...
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ISBN:
(纸本)0769510620
Fusion of various retrieval strategies has long been suggested as a means of improving retrieval effectiveness. To date, testing effusion was done by combining result sets from widely disparate approaches that include an uncontrolled mixture of retrieval strategies and utilities. To isolate the effect effusion on individual retrieval models, we have implemented probabilistic, vector space, and weighted Boolean models and tested the effect of fusion on these strategies in a systematic fashion. We also tested the effect of fusion on various query representations and have shown up to a twelve percent improvement in average precision.
Hypermedia applications generate comprehension and orientation problems due to their rich link structure. Adaptive hypermedia tries to alleviate these problems by ensuring that the links and the content of the informa...
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ISBN:
(纸本)0769510620
Hypermedia applications generate comprehension and orientation problems due to their rich link structure. Adaptive hypermedia tries to alleviate these problems by ensuring that the links and the content of the information pages are adapted to each individual user according to different background. This paper introduces KDAEHS, an Adaptive Education Hypermedia System based on Structural computing. The adaptation techniques allow students to choose their own learning goals, get suggestions for suitable study sequence and appropriate course materials. Structural semantic information are extracted from the course context and stored in the form of Knowledge Structure Graph. An adaptive engine implemented in Java servlet applies structural computing algorithms to generate adaptive presentation to different individual. This paper presents the architecture of KDAEHS as well as the system components in detail.
information system development is often in connection to functional requirements and business processes in organization. The development of the basic informationtechnology infrastructure (IT infrastructure) is theref...
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ISBN:
(纸本)0769515061;076951507X
information system development is often in connection to functional requirements and business processes in organization. The development of the basic informationtechnology infrastructure (IT infrastructure) is therefore easily forgotten. However, a reliable infrastructure is the key to successful operations. As business requirements the flexibility of the IT infrastructure becomes important. Here we argue that standards are in a key role in development of IT infrastructure that is flexible and adapts to future business needs.
Distributed real-time sensor networks are essential for effective surveillance in the digitized battlefield and for environmental monitoring. In this paper;we present the first systematic theory that leads to novel se...
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ISBN:
(纸本)0769510620
Distributed real-time sensor networks are essential for effective surveillance in the digitized battlefield and for environmental monitoring. In this paper;we present the first systematic theory that leads to novel sensor deployment strategies for effective surveillance and target location. We represent the sensor field as a grid (two- or three-dimensional) of points (coordinates), and use the term target location to refer to the problem of pin-pointing a target at a grill point at all instant in time. We use the fr framework: of identifying codes to determine sensor placement for unique target location. We provide coding-theoretic bounds on die number of sensors and present methods for determtheir placement in the sensorfield. We also show that sensor placement for single targets provides asymptotically complete (unambiguous) location of multiple targets.
To distinguish the reliabilities of different resources is difficult in the grid environment. For the first time the signaling game theory is applied to the research on grid resource reliability, and a grid resource r...
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ISBN:
(纸本)0769523153
To distinguish the reliabilities of different resources is difficult in the grid environment. For the first time the signaling game theory is applied to the research on grid resource reliability, and a grid resource reliability model based on promise is proposed in this paper. The analyses and the emulation results indicate that the resource provider should abandon the cheating motivation voluntarily. The resource demander could make right decision without other nodes' recommendations, the calculation and communication is reduced remarkably. This is a new solution to the problem of distinguishing resources reliabilities in the grid environment.
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