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KDAEHS: from architecture to system

KDAEHS: from architecture to system

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Ni, JF Zhou, XH Wang, KX Xu, HY Univ Sci & Technol China Dept Comp Sci Hefei 230027 Anhui Peoples R China

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.

关键词： adaptive hypermedia structural computing

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OISTI (An Oral-Interface System to provide Tourist-information inside a car)

OISTI (An Oral-Interface System to provide Tourist-Informati...

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Losada, MA Bernues, E Gonzalez, JM Ruiz, J Lleida, E Masgrau, E García, L Pardos, E Univ Zaragoza Dept Ingn Elect & Comun Area Teor Senal Zaragoza 50015 Spain

ISBN: (纸本)0769510620

In this paper, we present a positioning system implemented in JAVA designed to provide tourist information for car users. Most of this multimedia information is stored in a local database in the car but it is possible to increase or update it by accessing a remote database by mobile telephone. The system can be controlled like any standard computer by keyboard or by mouse, but also offers a hand-free control based in an oral-interface module very important for a system designed to be used inside a car.

关键词： multimedia system oral interface GPS database distributed system Mobil communication.

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Monitoring web information changes.

Monitoring web information changes.

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Flesca, S Furfaro, F Masciari, E Univ Calabria DEIS I-87030 Rende Italy

ISBN: (纸本)0769510620

Often web users want to be notified when a specific information contained in a web page has been modified. The problem of detecting web document changes has been deeply investigated and several systems providing notification of web page changes are available. These systems do not provide notification of changes on a specific information contained in a web page. In this work we present a system called CDWeb that performs this task. It allows users to monitor a whole document or specific portions of it. Users can also specify what kind of changes they are interested in, such as structural changes, or semantic changes. The system provides a flexible and adaptive view of the Web: it tracks user queries and creates user profiles, in order to associate a personalized view to each user.

关键词： Websites

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coding theory framework for target location in distributed sensor networks

Coding theory framework for target location in distributed s...

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Chakrabarty, K Iyengar, SS Qi, HO Cho, EC Duke Univ Dept Elect & Comp Engn Durham NC 27708 USA

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.

关键词： Location

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Optimal rate allocation for progressive fine granularity scalable video coding

Optimal rate allocation for progressive fine granularity sca...

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Wang, Q Xiong, ZI Wu, F Li, SP Tsing Hua Univ Dept Comp Sci Beijing 100080 Peoples R China Texas A&M Univ Dept Elect Engn College Stn TX 77843 USA Microsoft Res Beijing 100080 Peoples R China

ISBN: (纸本)0769510620

We examine the enhancement-layer rate allocation problem in progressive fine granularity scalable (PFGS) video coding. The problem arises from the fact that different frames in the enhancement layer have different rates in PFGS coding. A rate-distortion (R-D) function for a multi-frame group is first established for enhancement-layer PFGS coding, followed by experiments to verify its validity using real test sequences. Optimal rate allocation among frames in the group is then given based on the R-D function, together with a simple implementation that is suitable for applications like streaming video. Experiments show that, compared with uniform bit allocation, optimal bit allocation not only makes the quality variation in decoded video much smoother, but also improves the average PSNR of PFGS coding by 0.3-0.5 dB.

关键词： Scalable video coding

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Reactive and proactive approaches to media streaming: From scalable coding to content delivery networks

Reactive and proactive approaches to media streaming: From s...

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Lu, J EnjoyWeb Inc. United States

ISBN: (纸本)0769510620

For an end-to-end media streaming system, the Internet can be considered a black box in the middle that connects a client at one end to the server at the other end. In this paper, we present both ends' views of the streaming problems and review two approaches to these problems. The first approach, which is represented by scalable coding, is reactive in nature because it seeks to best adapt to the changing network conditions such as the bandwidth fluctuation and packet loss. The reactive approach is helpful in keeping a stream uninterrupted and providing a graceful degradation, but offers no guarantee on quality of the streamed content and does not help solve server-side problems such as scalability. The other approach is proactive and has motivated recent development in content delivery networks. We show that a content delivery network helps improve quality and scalability of streaming, and can be complemented with a reactive approach like scalable coding.

关键词： media streaming scalable coding content delivery network

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An oblivious and robust watermarking scheme using communications-with-side-information mechanism

An oblivious and robust watermarking scheme using communicat...

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Lu, CS Liao, HYM Acad Sinica Inst Informat Sci Taipei Taiwan

ISBN: (纸本)0769510620

Watermarking with oblivious detection and high robustness capabilities together is still a challenging problem zip to now. In addition, the number of secret keys which is required in the detection process should be kept as minimal as possible. Usually, a human visual model-based watermarking method requires recording the hiding places where watermarks are concealed. However, this kind of embedding strategy will cause an extra burden during watermark detection. The objective of this paper is to propose a more general watermarking framework which can satisfy the requirements of robustness and oblivious detection while only requiring one secret key in both the embedding and the detection processes. We propose to employ the side information concept which is commonly used in communication together with a mean filtering process to design a new watermarking technology. Experiments show that our method is robust against common attacks.

关键词： watermarking oblivious detection robustness communications-with-side-information

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Building perception for scheduling and executing a task using multiagent systems

Building perception for scheduling and executing a task usin...

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Sil, J Konar, A Univ Calcutta Dept Comp Sci & Engn Kolkata 700009 W Bengal India

ISBN: (纸本)0769510620

Involvement of the multi-agent systems for scheduling and executing a complex task autonomously, has been addressed in the paper to solve the navigational problems in robotics. Here, a complex task is broken into a number of subtasks and one to one mapping between subtask and agent is determined from the given relationship among various agents. In a dynamic environment the state-space model of the multiagent system has been designed using the agents' spatial coordinate positions and sensory data to facilitate performing a task through cooperation. The paper proposes an efficient strategy for collision resolution that may occur at an instant of time, while the robots navigate in the common environment. The distributed agent concept has been adopted in the paper to implement the whole scheme in JAVA.

关键词： multi-agent systems state-space model sensory information collision object oriented approach

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Data management for exploring complex time-dependent flow datasets

Data management for exploring complex time-dependent flow da...

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Liu, D Karplus, W Univ Calif Los Angeles Dept Comp Sci Los Angeles CA 90095 USA

ISBN: (纸本)0769510620

The ever increasing number of data-intensive scientific visualizations motivate the need for high-performance data management support. One such example is given from a simulation and visualization system that assists the physician in the planning and execution of a novel, non-invasive, and very effective treatment of brain aneurysm. The output dataset of this blood flow simulation is very large and information rich that demands an effective means to gaining insights into the nature of lime-varying flow fields. For this purpose, we built a computing environment which exploits efficient data storage and management techniques to provide a sufficient performance for real-time visualization. Our approach has substantial advantages for achieving higher access efficiency and storage utilization, yielding frame rates suitable for interactive visualization on common desktop workstations. Practical experiments indicate that the techniques developed in this environment can provide the basic building blocks for future efficient implementation of large complex data visualization systems.

关键词： data management real-time processing resource-bounded computing biomedical visualization

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High capacity audio data hiding for noisy channels

High capacity audio data hiding for noisy channels

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Chou, J Ramchandran, K Ortega, A Univ Calif Berkeley Dept EECS Berkeley CA 94708 USA

ISBN: (纸本)0769510620

In this work, we combine recent theoertical and algorithmic advances in the area of information-hiding with the current mature knowledge-base in the human audio perception system to propose a novel audio data-hiding technique that significantly pushes the state-of-the-art in the field. Our work is based on a combination of advances in two disjoint fields: information-hiding and human auditory masking. The field of information-hiding has recently seen a resurgence due to advances in the understanding of fundamental bounds from information theory. By integrating this with the human perceptual system knowledge that has been successfully exploited for several years in the audio compression community, we derive a new and improved audio data-hiding technique that finds application in a number of exciting scenarios like music enhancement and digital communications over analog data channels. Our preliminary results show that we can embed data at an order of magnitude higher rate than existing audio data hiding systems, while being robust to channel noise.

关键词： information theory

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