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Improve precategorized collection retrieval by using supervised term weighting schemes

Improve precategorized collection retrieval by using supervi...

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international conference on information technology: coding and computing (itcc)

作者： Ying Zhao G. Karypis Department of Computer Science University of Minnesota Minneapolis MN USA

The emergence of the World Wide Web has led to an increased interest in methods for searching for information. A key characteristic of many online document collections is that the documents have pre-defined category information, such as the variety of scientific articles accessible via digital libraries (e.g. ACM, IEEE, etc.), medical articles, news-wires and various directories (e.g. Yahoo, OpenDirectory Project, etc.). However, most previous information retrieval systems have not taken the pre-existing category information into account. In this paper, we present weight adjustment schemes based upon the category information in the vector-space model, which are able to select the most content-specific and discriminating features. Our experimental results on TREC data sets show that the pre-existing category information does provide additional beneficial information to improve retrieval. The proposed weight adjustment schemes perform better than the vector-space model with the inverse document frequency (IDF) weighting scheme when queries are less specific. The proposed weighting schemes can also benefit retrieval when clusters are used as an approximations to categories.

关键词： information retrieval Software libraries Contracts Indexing Computer science Inverse problems Frequency Text categorization Text mining US Department of Energy

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Watermarking in online media e-business

Watermarking in online media e-business

引用

international conference on information technology: coding and computing (itcc)

作者： S.H. Kwok C.C. Yang Department of Information and Systems Management Hong Kong University of Science and Technology Kowloon Hong Kong China Department of Systems Engineering and Engineering Management Chinese University of Hong Kong New Territories Hong Kong China

The need for copyright protection has become a detachable requirement for online media e-business as online multimedia businesses and enabling technologies become viable in recent years. Watermarking enables copyright protection in e-business but it also slows down the packaging process for delivery. The requirement of instant delivery is a prime requirement for online business. In the literature, extensive research on watermarking performance has been emphasized on imperceptibility and robustness but not the efficiency factor for online e-business, for example processing time and storage requirement that are crucial to the success of online e-business. We investigate four watermarking schemes derived from one-bit watermarking, multiple-bit watermarking and their combinations in order to identify a viable watermarking scheme that can meet the requirements of online e-business. The performance of these schemes in terms of preparation time, delivery time and storage requirement are measured and reported. Our analysis proves that the watermarking schemes with multiple-bit watermarking can ensure instant delivery with a penalty of some extra storage requirements.

关键词： Watermarking Copyright protection Robustness Water storage information management technology management Engineering management Systems engineering and theory Research and development management Multimedia systems

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Scalar BPM analyses of TE and TM polarized fields in bent waveguides

Scalar BPM analyses of TE and TM polarized fields in bent wa...

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international conference on information technology: coding and computing (itcc)

作者： Won Jay Song Byung Ha Ahn Systems Engineering and Operations Research Laboratories Department of Mechatronics Gwangju Institute of Science and Technology South Korea

ISBN: (纸本)0769515061

We have applied the effective index method to reduce the two-dimensional refractive index profile into the one-dimensional refractive index structure and modified the wave equations to obtain paraxial wave equations. TE and TM polarized fields in the curved single-mode planar waveguides are analyzed using the scalar beam-propagation method employing the finite-difference method with a slab structure. The bending loss in bent waveguides is analyzed for optical fields obtained from the beam-propagation method and comparisons are made between the loss for the waveguides with various radii of curvature and refractive index differences. The outward shift of the optical field, which is generated at the connection between a straight and bent waveguide, is obtained from calculations of the location of maximum optical intensity. The transition loss can be reduced by introducing an optimized inward offset at a straight-to-bend junction. The wavelength shift due to birefringence of TE and TM polarized fields in bent waveguides is also calculated.

关键词： Tellurium Optical waveguides Refractive index Optical losses Optical refraction Optical variables control Partial differential equations Optical polarization Optical planar waveguides Planar waveguides

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Distributed power control using the simultaneous mutation of genetic algorithms in cellular radio systems

Distributed power control using the simultaneous mutation of...

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international conference on information technology: coding and computing (itcc)

作者： Won Jay Song Byung Ha Ahn Department of Mechatronics Systems Engineering and Operations Research Laboratories Gwangju Institute of Science and Technology South Korea

ISBN: (纸本)0769515061

This paper has proposed a distributed power control algorithm that uses a stochastic search technique in order to solve linear systems of equations for power update in CDMA cellular radio systems. The proposed algorithm is developed by applying Bremermann's evolutionary computation algorithm to the CDMA power control problem. The major advantage of the applied evolutionary computation algorithm is more rapid optimization on linear systems of equations compared with the simple genetic algorithm (SGA). By employing distributed constrained power control (DCPC) as a reference algorithm, we have designed and implemented computational experiments on the DS-CDMA system. The results indicate that the proposed algorithm significantly enhances the optimization speed of power control. The proposed algorithm is also compared with the bang-bang type algorithm used in the IS-95 and W-CDMA systems. The results show that our proposed algorithm also has the potential to increase the CDMA cellular radio network capacity and decrease the mobile terminal power consumption.

关键词： Power control Genetic mutations Genetic algorithms Land mobile radio cellular systems Multiaccess communication Linear systems Equations Evolutionary computation Stochastic systems Algorithm design and analysis

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STED: a system for topic enumeration and distillation

STED: a system for topic enumeration and distillation

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international conference on information technology: coding and computing (itcc)

作者： G. Greco S. Greco E. Zumpano DEIS University of Calabria Rende Italy

Search services on hyperlinked data are becoming popular among users because of the huge amount of data available and the consequent difficulty of retrieving and filtering relevant documents. Traditional term-based search engines are not very useful for this purpose since the resulting ranking depends on the users's precision in expressing the query. Current research, instead, takes a different approach, called topic distillation, which consists of finding documents related to the query topic, but these do not necessarily contain the query string. Current algorithms for topic distillation first compute a base set containing all the relevant pages and then apply an iterative procedure to obtain the authoritative pages. In this paper we present STED, a system for topic distillation and enumeration (i.e. identification of different communities) of Web documents. The system is based on a technique which computes authoritative pages by analyzing the structure of the base set. More specifically, the system applies a statistical approach to the co-citation matrix associated with the base set, to find the most co-cited pages and analyzes both the link structure and the content of pages. Several experiments have demonstrated the effectiveness and efficiency of the system.

关键词： Search engines information retrieval Filtering Iterative algorithms Statistical analysis information resources information processing Databases Web sites World Wide Web

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Utilising audio-visual stimuli in interactive information systems: a two domain investigation on auditory metaphors

Utilising audio-visual stimuli in interactive information sy...

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international conference on information technology: coding and computing (itcc)

作者： D.I. Rigas D. Memery School of Informatics University of Bradford Bradford UK

The paper describes experiments that investigated the use of auditory stimuli (speech and non-speech sound) to communicate data in two information systems. These experiments were performed under a multimedia stock control system and a multimedia e-mail tool. Experiments using the multimedia stock control information system investigated rhythms and timbre to communicate windows and their associated functions as well as the simultaneous rise of speech and sound to communicate a large amount of information to users. Experiments using the multimedia e-mail tool investigated the use of tunes and short pitch sequences with visual stimuli to communicate information in browsing e-mail data. The paper also integrates experimental results front both systems and discusses the incorporation of auditory stimuli in interactive audio-visual or multimedia information systems. Auditory stimuli helped to communicate, complement or reinforce information that users received via the visual channel. These auditory technologies could also benefit visually impaired users of such systems. Results also indicated that the simultaneous use of sound and speech can be useful in the design of interactive multimedia information systems. The inclusion of auditory stimuli (including speech) in the design of information systems has the potential to maximise the volume of information communicated to users.

关键词： information systems Multimedia systems Control systems Electronic mail Speech synthesis Rhythm Timbre Guidelines User interfaces Software design

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Healthcare information systems using digital signature and synchronized smart cards via the Internet

Healthcare information systems using digital signature and s...

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international conference on information technology: coding and computing (itcc)

作者： Won Jay Song Byung Ha Ahn Won Hee Kim Systems Engineering and Operations Research Laboratories Department of Mechatronics Gwangju Institute of Science and Technology South Korea VLSI and CAD Laboratories Department of Electronics Engineering Chungnam National University South Korea

ISBN: (纸本)0769515061

This research paper presents a new two-way double-type smart card terminal and a new system design and development for a prescription order communication system (POCS) between the hospital and pharmacy, based on the Internet, public-key infrastructure (PKI), and concurrently parallel co-operation with both medical professional and patient smart cards in synchronized status, in order to control security and privacy of patients and manage drug histories. A concurrently parallel co-operation method in synchronized status has been proposed in order to merge the digital signature generated by a medical professional with a patient's prescription data. The digital signatures written by the medical professionals (doctors and pharmacists) holding and using their individually master smart cards are applied to all contents of the prescription stored on a patient slave smart card in synchronized status in the two-way double-type terminal. Therefore, digital signatures for all prescriptions stored on the smart card should effectively be used to prevent it being altered, forged, or reused by unauthorized users and being repudiated by medical professionals.

关键词： Medical services information systems Digital signatures Smart cards Internet Hospitals Public key Medical control systems Communication system control Control systems

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Internet browsing: visualizing category map by fisheye and fractal views

Internet browsing: visualizing category map by fisheye and f...

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international conference on information technology: coding and computing (itcc)

作者： C.C. Yang Hsinchun Chen K. Hong Department of Systems Engineering and Engineering Management Chinese University of Hong Kong Hong Kong China Department of Management Information Systems University of Arizona Tucson USA Department of Computer Science and Information Systems University of Hong Kong Hong Kong China

A category map developed based on Kohonen's self-organizing map has been proven to be a promising browsing tool for solving the information overload problem of the World Wide Web. The SOM algorithm automatically compresses and transforms a complex information space into a two-dimensional graphical representation. Such graphical representation provides a user-friendly interface for users to explore the automatically generated mental model. However, as the amount of information increases, the size of the category map is expected to increase accordingly in order to accommodate the important concepts in the information space, which increases the visual load of the category map. In this paper, we propose the fisheye views and fractal views to support the visualization of category map. Fisheye views are developed based on the distortion approach while fractal views are developed based on the information reduction approach. We have developed a prototype system and conducted a user evaluation to investigate the performance of fisheye views and fractal views. The results show that both fisheye views and fractal views significantly increase the effectiveness of visualizing the category map. In addition, fractal views are significantly better than fisheye views.

关键词： Internet Visualization Fractals Management information systems information filtering information filters Systems engineering and theory Research and development management Computer science Web sites

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Joint source-channel coding using simplified block-based segmentation and content-based rate-control for wireless video transport

Joint source-channel coding using simplified block-based seg...

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international conference on information technology: coding and computing (itcc)

作者： S. Aramvith H. Kortrakulkij D. Tancharoen S. Jitapankul Digital Signal Processing Research Laboratory Department of Electrical Engineering Chulalongkom University Bangkok Thailand

The scenario of using Automatic Repeat reQuest (ARQ) retransmission for two-way low bit-rate video communications over wireless Rayleigh fading channels is studied. In this kind of channel, the packets inevitably experience errors during deep fades. The retransmissions can be used to re-send such packets. During retransmissions, the video encoder buffer fills up quickly and may cause the rate-control algorithm to skip frames or allocate less number of bits to encode the video frame. To reduce the number of frames skipped and improve bit allocation, we propose a content-based rate-control scheme using simplified block-based segmentation to intelligently allocate more bits to the foreground region. In addition, our proposed scheme also takes into consideration the effects of the video buffer fill-up, an a priori channel model, channel feedback information. The simulation results indicate that our proposed scheme encodes the video sequences with higher quality on the foreground region and much fewer frame skipping as compared to H.263 TMN8.

关键词： Image segmentation Automatic repeat request Video compression Fading Bit rate Feedback Face detection Change detection algorithms Digital signal processing Wireless communication

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The object behavior of Java object-oriented database management systems

The object behavior of Java object-oriented database managem...

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international conference on information technology: coding and computing (itcc)

作者： C.-T.D. Lo M. Chang O. Frieder D. Grossman Department of Computer Science Illinois Institute of Technology Chicago IL USA

Due to its portability and popularity for Internet applications, Java has become one of the major programming languages. The similar syntax inherited from the C language and the pure object oriented features, compared to the non-pure object-oriented C++ language, have caused Java to be a good candidate as a tool in designing object oriented systems, especially in database servers. However the performance of the Java Virtual Machine (JVM) is the reason that several database designers, such as Oracle, IBM, Sybase and Informix, have not fully transferred their database management system (DBMS) into Java. One of the performance indices is the responsiveness for online transaction processing (OLTP) which may be dominated by the garbage collection system inside the JVM. In this paper eight Java programs, jess, javac, mtrt, compress, db, db4o, smallDB and ozone, are used to study the dynamic memory behavior. The latter four programs are Java object-oriented database management systems and their object behaviors are compared to those of the four regular Java programs. Simulation results such as object size distribution, average object size, object live distribution and total garbage collection cycle are reported.

关键词： Java Database systems Object oriented databases Spatial databases Transaction databases Internet Computer languages Virtual machining Delay Object oriented modeling

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