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An authoring tool for preparing online theorems and proofs with a dynamic geometry environment

An authoring tool for preparing online theorems and proofs w...

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16th International Conference on computers in Education, ICCE 2008

作者： Wong, Wing-Kwong Li, Yu-Hao Hsu, Sheng-Cheng Yin, Sheng-Kai Yang, Hsi-Hsun Institute of Computer Science and Information Engineering National Yunlin University of Science and Technology Douliou Yunlin Taiwan Department of Information Management Nan Kai University of Technology Caotun Nantou Taiwan Graduate School of Engineering Science and Technology National Yunlin University of Science and Technology Douliou Yunlin Taiwan Department of Media and Design Asia University Wufeng Taichung Taiwan

ISBN: (纸本)9789868473522

With advanced technologies of natural language processing, interactions between computer and human can be very user-friendly. Recently, humans can use their language to communicate to systems of computer-assisted learning. In this paper, an authoring tool has been proposed to help students learn geometry theorems and proofs. This tool is based on Java Sketchpad and regular expression template. With the tool, teachers can edit a geometry proof problem with a client browser and analyse the problem with the knowledge engine. Moreover, the knowledge engine translates the online materials into a XML format and produces a script for drawing a dynamic geometry figure within Java Sketchpad. With an internet browser, students can access these XML materials and manipulate the figure in the dynamic geometry environment when studying theorems and proofs. Furthermore, a preliminary evaluation of the knowledge engine shows that it can understand about 77% of textbook problems.

关键词： Geometry

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Designing for participation in public knowledge institutions 08

Designing for participation in public knowledge institutions

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NordiCHI 2008: Building Bridges - 5th Nordic Conference on Human-computer Interaction

作者： Dalsgaard, Peter Dindler, Christian Eriksson, Eva Department of Information and Media Studies University of Aarhus 8200 Aarhus N Denmark Interaction Design Department of Computer Science and Engineering Chalmers University of Technology S-41296 Göteborg Sweden

ISBN: (纸本)9781595937049

We address the challenges facing designers of interactive technologies for public knowledge institutions such as museums, libraries and science centres. We argue that visitor participation is a key concern for these institutions and present a theoretical framework for understanding participation grounded in pragmatist philosophy. We then present design work carried out in three different settings, namely a museum, a combined aquarium and science centre, and a municipal library. Based on a discussion of these design cases, we offer six design considerations for designing for participation in public knowledge institutions. Copyright 2008 ACM.

关键词： Libraries

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A Progress Report and a Proposal: Interactivity in Ubiquitous Learning Enhanced by Virtual Tutors in e-Learning Contents

A Progress Report and a Proposal: Interactivity in Ubiquitou...

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IEEE International Conference on Sensor Networks, Ubiquitous, and Trustworthy Computing

作者： Toshiyuki Yamamoto Ryo Miyashita Department of Media Informatics Kanazawa Institute of Technology Japan Graduate Program in Information andComputer Engineering Kanagawa Institute of Technology Japan Graduate Program in Information and Computer Engineering Kanazawa Institute of Technology Japan

ISBN: (纸本)9780769531588;9780769534114

It is proposed in this session that the interactivity necessary in ubiquitous learning can be enhanced by the virtual tutor who mediates between the learner and the e-learning contents. Arousing students' intellectual curiosity and raising their motivation to learn are the two great goals for e-learning contents developers. It is supposed that the interaction in the communication between the teacher and his/her students in a regular classroom can be maintained in e-learning with the help of virtual tutor, which appears on the learning contents in a timely fashion to give learners advice, encouragement, reminders, and such. The session includes discussions to develop such a system making use of the most updated technology as well as demonstrations of such a system which has been experimented at department of media Informatics. It is proved that the learning environment where human interactivity is essential can be reconstructed in terms of the proposed virtual tutor. This paper presentation includes demonstrations of QED as well as a discussion of the importance of interactivity in ubiquitous e-learning.

关键词： Proposals Electronic learning Educational institutions computer networks computer displays Pervasive computing Informatics Humans computer science education computer graphics

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Hierarchical background subtraction using local pixel clustering

Hierarchical background subtraction using local pixel cluste...

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作者： Zhong, Bineng Yao, Hongxun Shan, Shiguang Chen, Xilin Gao, Wen Department of Computer Science and Engineering Harbin Institute of Technology China Digital Media Research Center Institute of Computing Tech. CAS Beijing China Key Laboratory of Intelligent Information Processing CAS Beijing China Digital Media Institute Peking University Beijing China

ISBN: (纸本)9781424421756

We propose a robust hierarchical background subtraction technique which takes the spatial relations of neighboring pixels in a local region into account to detect objects in difficult conditions. Our algorithm combines a per-pixel with a per-region background model in a hierarchical manner, which accentuates the advantages of each. This is a natural combination because the two models have complementary strengths. The per-pixel background model is achieved by mixture of Gaussians Models (GMM) with RGB feature. Although precisely describing background change in high resolution, it suffers from the sensitivity to quick variations in dynamic environment. To tolerate these quick variations, we further develop a novel GMM based per-region background model, which is updated by the cluster centers obtained from a k-means clustering of the pixels' RGB feature in the region. Numerical and qualitative experimental results on challenging videos demonstrate the robustness of the proposed method. © 2008 IEEE.

关键词： Pixels

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Designing and Verifying Communication Protocols Using Model Driven Architecture and Spin Model Checker

Designing and Verifying Communication Protocols Using Model ...

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International Conference on computer Science and Software engineering

作者： Prabhu Shankar Kaliappan Hartmut Koenig Vishnu Kumar Kaliappan Chair Computer Networks and Communication Systems Brandenburg University of Technology Cottbus Germany Department of Information & Communication Engineering Konkuk University Seoul South Korea

ISBN: (纸本)9781424439027

The need of communication protocols in todaypsilas environment increases as much as the network explores. Many new kinds of protocols, e.g. for information sharing, security, etc., are being developed day-to-day which often leads to rapid, premature developments. Many protocols have not scaled to satisfy important properties like deadlock and livelock freedom, since MDA focuses on the rapid development rather than on the quality of the developed models. In order to fix the above, we introduce a 2-Phase strategy based on the UML state machine and sequence diagram to satisfy the properties of communication protocols. We convert these models into PROMELA code for execution on the SPIN model checker. The results are compared with the developed UML models.

关键词： Protocols Unified modeling language Object oriented modeling computer architecture Logic Software systems computer languages computer science Software engineering Software design

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An independence of causal interactions model for opposing inuences

An independence of causal interactions model for opposing in...

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4th European Workshop on Probabilistic Graphical Models, PGM 2008

作者： Maaskant, Paul P. Druzdzel, Marek J. Department of Media and Knowledge Engineering Delft University of Technology 2628 CD Delft Netherlands Faculty of Computer Science Bia Lystok Technical University Wiejska 45A 15-351 Bia lystok Poland Decision Systems Laboratory School of Information Sciences University of Pittsburgh Pittsburgh PA 15260 United States

We introduce the DeMorgan gate, an Independence of Causal Interactions (ICI) model that is capable of modeling opposing inuences, i.e., a mixture of positive and negative inuences of parents on a child. The model is a noisy version of a conjunctive normal form of Boolean functions and is an extension and a combination of the popular Noisy OR and Noisy-AND models, preserving their intuitive semantics. We report the results of a simple experiment testing the usefulness of the proposed model for elicitation of conditional probability distributions.

关键词： Semantics

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Supporting end-to-end resource virtualization for web 2.0 applications using service oriented architecture

Supporting end-to-end resource virtualization for web 2.0 ap...

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2008 IEEE Globecom Workshops, GLOBECOM 2008

作者： Papagianni, C. Karagiannis, G. Tselikas, N.D. Sfakianakis, E. Chochliouros, I.P. Kabilafkas, D. Cinkler, T. Westberg, L. SjÖdin, P. Hidell, M. De Groot, S. Heemstra Kontos, T. Katsigiannis, C. Pappas, C. Antonakopoulou, A. Venieris, I.S. School of Electrical and Computer Engineering National Technical University of Athens Greece CTIT and Department of Electrical Engineering Mathematics and Computer Science University of Twente Enschede Netherlands Department of Telecommunications Science and Technology University of Peloponnese Greece Research Programs Section Labs and New Technologies Division ellenic Telecommunications Organization S.A. Switching and Services Laboratory Labs and New Technologies Division Hellenic Telecommunications Organization S.A. Greece Department of Telecommunications and Media Informatics Budapest University of Technology and Economics Hungary Ericsson Research Stockholm Sweden School of Information and Communication Technology Royal Institute of Technology Stockholm Sweden Twente Institute for Wireless and Mobile Communication Enschede Netherlands Siemens IT Solutions and Services Athens Greece

ISBN: (纸本)9781424430628

In recent years, technologies have been introduced offering a large amount of computing and networking resources. New applications such as Google AdSense and BitTorrent can profit from the use of these resources. An efficient way of discovering and reserving these resources is by using the Service Oriented Architecture (SOA) concept. SOA can be considered as a philosophy or paradigm in organizing and utilizing services and capabilities that may be under the control of different ownership domains. This paper presents an architecture that can be used to support end-to-end resource virtualization for Web 2.0 applications and in particular for peer-to-peer applications by using the Service Oriented Architecture concept. © 2008 IEEE.

关键词： information services

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Comments on "A Semi-blind Digital Watermarking Scheme Based on Singular Value Decomposition"

Comments on "A Semi-blind Digital Watermarking Scheme Based ...

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International Conference on Intelligent Systems Design and Applications (ISDA)

作者： Ting-Xian Zhang Wei-Min Zheng Zhe-Ming Lu Bei-Bei Liu Media Processing and Communication Lab School of Information Science and Technology Sun Yat-sen University China Department of Computer Science and Engineering Hong Kong University of Science and Technology Hong Kong China

For original paper see J. Shich, *** and M. Chang, ibid., vol.28, p.428-440, (2006). In a recent paper, a robust water-marking approach for hiding grayscale image watermark into digital images based on SVD (singular value decomposition) is proposed by Shich et al. This comment demonstrates that the high robustness of the proposed scheme against various attacks is a result of improper algorithm design. The extracted watermark is just determined by the reference watermark used during the extraction process no matter what the input suspected image is.

关键词： Watermarking Singular value decomposition Optical wavelength conversion Robustness Discrete wavelet transforms Data mining Gray-scale Matrix decomposition Chaos Digital images

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An adaptive clustering algorithm based on the possibility clustering and isodata for multispectral image classification 21

An adaptive clustering algorithm based on the possibility cl...

引用

21st Congress of the International Society for Photogrammetry and Remote Sensing, ISPRS 2008

作者： Liu, Wenping Hung, Chih-Cheng Kuo, Bor-Chen Coleman, Tommy Department of Digital Media School of Information Beijing Forestry University Beijing China Department of Computer Science North China University of Technology Beijing China School of Computing and Software Engineering Southern Polytechnic State University MariettaGA30060 United States Mathematics Education Department National Taichung University Taichung Taiwan HSCaRS Alabama A and M University NormalAL35762 United States

For a clustering algorithm, the number of clusters is a key parameter since it is directly related to the number of homogenous regions in the given image. Although ISODATA clustering algorithm can determine the number of clusters and cluster centers dynamically, it is challenging to specify so many parameters. The possibility clustering provides the memberships that are interpreted as the degrees of possibility. So the memberships in one class are not related to the memberships in other classes. By taking the advantages of these two clustering algorithms, a new fuzzy clustering algorithm is proposed by combining the possibility clustering and ISODATA clustering algorithm. This new algorithm not only can determine the number of clusters dynamically with the degree of possibility of each date point, but also can reduce the number of input parameters of ISODATA algorithm. The splitting and merging process is evaluated by the possibility distance.

关键词： Clustering algorithms

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Hierarchical background subtraction using local pixel clustering

Hierarchical background subtraction using local pixel cluste...

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International Conference on Pattern Recognition

作者： Bineng Zhong Hongxun Yao Shiguang Shan Xilin Chen Wen Gao Department of Computer Science and Engineering Harbin Institute of Technology Digital Media Research Center Institute of Computing Technology Chinese Academy of Sciences Beijing China Key Laboratory of Intelligent Information Processing Chinese Academy and Sciences Beijing China Digital Media Institute Peking University Beijing China

ISBN: (纸本)9781424421749

We propose a robust hierarchical background subtraction technique which takes the spatial relations of neighboring pixels in a local region into account to detect objects in difficult conditions. Our algorithm combines a per-pixel with a per-region background model in a hierarchical manner, which accentuates the advantages of each. This is a natural combination because the two models have complementary strengths. The per-pixel background model is achieved by mixture of Gaussians models (GMM) with RGB feature. Although precisely describing background change in high resolution, it suffers from the sensitivity to quick variations in dynamic environment. To tolerate these quick variations, we further develop a novel GMM based per-region background model, which is updated by the cluster centers obtained from a k-means clustering of the pixelspsila RGB feature in the region. Numerical and qualitative experimental results on challenging videos demonstrate the robustness of the proposed method.

关键词： Autoregressive processes Robustness Object detection Videos Layout Smart pixels Content addressable storage Gaussian processes Lighting Cameras

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