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International Conference on information and Communication Technologies: From Theory to Applications, ICTTA

作者： S. Atawneh Software Engineering Department Information Technology Faculty Hashemite University Jordan

As vast channels for communication such as the Internet are becoming popular, the security of digital media becomes a greater concern. Steganography is one of the techniques used to make detecting the transmitted data over channels more difficult, as hiding a message reduces the probability of detecting this message. In this paper we suggest a new steganography algorithm for hiding a gray image in one another. The cover is divided into blocks of equal sizes. Each block size equals the size of the embedding image. The results drawn in this paper with the similarity = 0.9717 are more improved and give the clear picture of the object

关键词： Steganography Data encapsulation Art Cryptography Data security information security Watermarking Robustness software engineering information technology

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A unified data grid replication framework

A unified data grid replication framework

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e-Science 2006 - 2nd IEEE International Conference on e-Science and Grid Computing

作者： Ho, Tim Abramson, David Monash e-Science and Grid Engineering Lab. Faculty of Information Technology Monash University 900 Dandenong Rd Caulfield East 3145 Australia

ISBN: (纸本)0769527345

Modern scientific experiments can generate large amounts of data, which may be replicated and distributed across multiple resources to improve application performance and fault tolerance. Whilst a number of different replica management systems exist, particular communities usually adopt a single system. This creates problems when an application program spans more than one community, because it may need to target more than one middleware layer. One solution to this problem is to build a more flexible data access layer above the specific replica middleware. In this paper, we discuss such an architecture, the Grid Replication Framework, which provides applications with an abstract interface to existing replica systems. Further, the framework's flexible plug-in architecture makes it easy to support new middleware as it becomes available. © 2006 IEEE.

关键词： Grid computing

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View Dependent Sequential Point Trees

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Journal of Computer Science & technology 2006年第2期21卷 181-188页

作者：王文成魏峰吴恩华 State Key Lab of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100080 P.R. China Department of Computer and Information Science Faculty of Science and Technology University of Macao Macao Special Administration Region P.R. China Graduate University of Chinese Academy of Sciences Beijing 100039 P.R. China

Sequential point trees provide the state-of-the-art technique for rendering point models, by re-arranging hierarchical points sequentially according to geometric errors running on GPU for fast rendering. This paper presents a view dependent method to augment sequential point trees by embedding the hierarchical tree structures in the sequential list of hierarchical points. By the method, two kinds of indices are constructed to facilitate the points rendering in an order mostly from near to far and from coarse to fine. As a result, invisible points can be culled view-dependently in high efficiency for hardware acceleration, and at the same time, the advantage of sequential point trees could be still fully taken. Therefore, the new method can run much faster than the conventional sequential point trees, and the acceleration can be highly promoted particularly when the objects possess complex occlusion relationship and viewed closely because invisible points would be in a high percentage of the points at finer levels.

关键词： view dependence visibility culling GPU point-based rendering real time rendering

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New approach to complexity reduction of intra prediction in advanced multimedia compression

New approach to complexity reduction of intra prediction in ...

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ICCSA 2006: International Conference on Computational Science and Its Applications

作者： Yu, Mei Jiang, Gangyi Li, Shiping Li, Fucui Choi, Tae-Young Faculty of Information Science and Engineering Ningbo University Ningbo 315211 China State Key Lab. for Novel Software Technology Nanjing University Nanjing 210093 China Institute of Computer Technology Graduate School Chinese Academy of Sciences Beijing 100871 China Division of Electronics Engineering Ajou University Suwon 442-749 Korea Republic of

ISBN: (纸本)354034070X

H.264 is the new multimedia compression standard developed by VCEG and MPEG. In order to maximize the compression performance, H.264 adopts RDO mode decision techniques at the cost of very remarkable computational complexity. To reduce encoder complexity associated with the intra-prediction mode selection, in this paper, a fast intra prediction mode selection scheme is proposed. It is based on three improvement parts, including improvement of the intra prediction algorithm structure, fast selection between intra 4×4 block mode and intra 16×16 block mode, and the fast 4×4 luma block mode selection based on the luma similarity between reference pixels. Experimental results show that the proposed scheme outperforms Pan's method, and compared with the test model JM8.6 provided by JVT, the proposed scheme reduces 83.10% coding time for intra frames and 50.94% coding time for all the frames while maintaining the PSNR and bit rate. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Large scale systems

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A metamodelling-based approach for method fragment comparison

A metamodelling-based approach for method fragment compariso...

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11th International Workshop on Exploring Modeling Methods for Systems Analysis and Design, EMMSAD 2006 - Held in Conjunction with the 18th Conference on Advanced information Systems, CAiSE 2006

作者： Cossentino, Massimo Gaglio, Salvatore Henderson-Sellers, Brian Seidita, Valeria Istituto di Calcolo delle Reti ad Alte Prestazioni Consiglio Nazionale delle Ricerche Palermo Italy Dipartimento di Ingegneria Informatica University of Palermo Italy Department of Software Engineering Faculty of Information Technology University of Technology Sydney Australia

Several different approaches to Situational Method engineering exist. They differ in terms of the primary element of the paradigm: the method fragment definition. Here, we introduce four method fragment definitions from the literature and compare their metamodels according to structural and functional criteria. The structural comparison showed a general alignment of some concepts that are sometimes referred with different names while the study of the compositional aspects results in evidence of substantial differences.

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Comparing XML-IR query formation interfaces

Proceedings of the Eleventh Australasian Document Computing ...

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Proceedings of the Eleventh Australasian Document Computing Symposium, ACDS 2006 2006年

作者： Woodley, Alan Geva, Shlomo Edwards, Sylvia Lauretta School of Software Engineering and Data Communications Faculty of Information Technology Queensland University of Technology QLD 4000 Australia School of Information Systems Faculty of Information Technology Queensland University of Technology QLD 4000 Australia

XML information retrieval (XML-IR) systems differ from traditional information retrieval systems by using structure of XML documents to retrieve more specific units of information than the documents themselves. Users interact with XML-IR systems via structured queries that express their content and structural requirements. Historically, it has been common belief within the XML-IR community that structured queries will perform better than traditional keyword-only queries. However, recent system-orientated analysis has show that this assumption may be incorrect when system performance is averaged over a set of queries. Here, we test this assumption with users via a simulated work task experiment. We compare a keyword only interface with two user friendly XML-IR interfaces: NLPX, a natural language interface and Bricks, a query-bytemplate interface. This is the first time that a XML-IR natural language interface has been tested in user experiments. We compare the retrieval performance of all three interfaces and the usability of the two structured interfaces. Our results correspond to those of the system-orientated evaluation and indicate that structured queries do not aid retrieval performance. They also show that in terms of retrieval performance and usability the structured interfaces are comparable.

关键词： XML

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Implicit surface boolean operations based cut-and-paste algorithm for Mesh models

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16th International Conference on Artificial Reality and Telexistence, ICAT 2006

作者： Qin, Xujia Yang, Xinhua Zheng, Hongbo College of Software Zhejiang University of Technology Hangzhou 310032 China State Key Lab of CADandCG Zhejiang University Hangzhou 310027 China School of Mechanical Engineering Dalian Jiaotong University Dalian 116028 China College of Information Engineering Zhejiang University of Technology Hangzhou 310032 China

ISBN: (纸本)3540497765

Cut-and-paste operation for 3D models is a new geometry modelling method by examples. The method constructs a new model from two or more existed models by cutting some useful parts from source models and pasting to target model. A novel cut-and-paste algorithm for mesh models based on implicit surface Boolean operations is proposed. The algorithm composes of following steps: Firstly, cut part of mesh from source model and align it with the target model. Secondly, convert the two mesh models into point models and convert the point models into implicit surfaces with RBF interpolation. Thirdly, merge the two implicit surfaces by union operation. And finally, polygonize the implicit surface. Then the final new mesh model is obtained. Because the two elements of Boolean operation are not mesh models, it can avoid complex and time consume intersection calculations of facets and edges. The experiments show that good results can be obtained with the algorithm. The approach can be used to create special and exaggerated models for computer animation. © 2006 Springer-Verlag Berlin/Heidelberg.

关键词： Mesh generation

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L3OP: Learning Styles Application Using Learning Objects Approach

L3OP: Learning Styles Application Using Learning Objects App...

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International Conference on Computer and information technology (CIT)

作者： Siti Hafizah Ab Hamid Tan Hock Chuan Zarinah Mohd Kasirun Department of Software Engineering Faculty of Computer Science and Information Technology University of Malaya Kuala Lumpur Malaysia

Learning Objects is not a new approach in electronic learning system. It has been applied since more than seven years ago. It can be clearly seen in CanCore project [9] in Canada and the emerging of several standards of Learning Objects by well-known organizations such as IEEE. L3OP (Learning Objects technology in Object-Oriented Programming ELearning System) project applies the Learning Objects concept into electronic learning system focusing on digitalizing learning styles (especially among higher education students). The electronic learning systems have been used by these students since past few generations and many of them have been enhanced. However, some students still feel that the electronic learning systems are not as effective as they may seem. The reason is varieties of traditional methods of learning styles used by these students, for example, jotting down and highlighting notes cannot be done in the electronic learning systems. For example, some students prefer to use highlight pen or marker to underline the important notes. However, the electronic learning systems can not digitize the styles. The project is only concentrated on visual type of learners. The Learning Objects approach used in this project not only to ensure the organization of the database but also the reusability of the learning content itself.

关键词： Electronic learning Object oriented programming information technology Stress Application software software engineering Computer science Programming profession Standards organizations Educational technology

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Cross-language similarity between perceptual and semantic structures of color tones

Cross-language similarity between perceptual and semantic st...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Giragama, Charith N. W. Marasinghe, Chandrajith A. Madurapperuma, Ajith P. Wanasinghe, Dishna R. Herath, Susantha Minetada, Osano Valista International Lanka (Pvt.) Ltd. Sri Lanka Department of Software Engineering University of Aizu Japan Faculty of Information Technology University of Moratuwa Sri Lanka St. Cloud State University St. Cloud MN 56301-4498 United States

ISBN: (纸本)9781424400997

The paper describes a study of how Japanese and Sinhala naive viewers use modifiers to describe differences in color tones. Three sequences of color tone stimuli were created for three hues, red, green and blue by varying just two parameters, saturation and value. Two methods were employed to study how naive viewers use modifiers to describe differences in their perceptions and modifiers of color tones. A preliminary elicitation employed the methods of selection description, in which Japanese and Sinhala modifiers meaning -pale, bright, vivid, strong, dull, dark- constituted a high proportion of responses. These modifiers were employed in a triadic comparison. Dissimilarities of all pair wise comparisons of stimuli were submitted to MDS analysis in order to derive a multidimensional perceptual structure for the stimuli. A semantic differential structure was derived applying PCA for modifier responses provided for the same set of stimuli. The results revealed that Japanese and Sinhala native speakers perceptually discriminate the six color tone stimulus into six categories. Furthermore, the semantic structures for each hue were different from one a another. And it was observed that the semantic structures related differently to the dimensions of the perceptual structures.

关键词： perception of color tone multidimensional scaling multilingual semantic differential analysis

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Effects of thermal stratification and wind blowing on hydrodynamics in the Bohai Sea with notably shallow depths

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Estuarine and Coastal Modeling 2005

作者： Yamanaka, Ryoichi Nakatsuji, Keiji Liang, Shuxiu Inoue, Yoshiyuki Faculty of Environment and Information Sciences Yokohama National University 79-7 Tokiwadai Yokohama Kanagawa 240-851 Japan Department of Global Architecture Graduate School of Engineering Osaka University Japan State Key Lab. of Coastal and Offshore Engineering Dalian University of Technology China Faculty of Environment and Information Sciences Yokohama National University Japan

ISBN: (纸本)0784408769

The problem of water pollution has become more widespread and severe in Chinese estuarine and coastal areas, such as the Bohai Bay and the mouth of the Yangtze River. The Bohai Sea has experienced the highest increase of pollution levels caused by rapid economic development and discharge of land waste. In order to recover the ocean environment in the Bohai Sea, it is necessary to understand the hydrodynamics of the sea. The present study focuses on the evolution of thermal stratification and the dispersion processes as a result of river water from the Yellow River discharging into the Bohai Sea. A three-dimensional baroclinic flow model was applied to simulate the current system and the density field, using the NCEP/NCAR Reanalysis (available from the NOAA Climate Diagnostics Center) and JCOPE reanalysis data (Miyazawa and Yamagata, 2003) as a boundary condition. A long-term hindcast simulation for 2003 was carried out. This simulation makes the spatial variability of the density stratification clear in the Bohai Sea. Moreover, the detailed particulars of the behavior of suspended solids in the Yellow River water are investigated using a modified Lagrangian particle tracking method. The present model can predict well the distribution of high turbidity water mass which can be seen in the southwestern sea area in the Laizhou Bay in Landsat satellite images. Wind effects on the sediment distribution were evaluated. Copyright ASCE 2006.

关键词： Hydrodynamics

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