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IEEE/ACM International Symposium on Cluster comput.ng and the Grid (CCGRID)

作者： J. Machea A. Apon Dept. of Math. & Comput. Sci. Lewis & Clark Coll. Portland OR USA Computer Science and Computer Engineering University of Arkansas Fayetteville Arkansas USA

ISBN: (纸本)9780780390744

Grid protocols and technologies arc being adopted in a wide variety of academic, government, and industrial environments, and there is a growing body of research-oriented literature in grid comput.ng. However, there is a need for educational material that is suitable for classroom use. This paper describes our topics, exercises and experiences of teaching grid comput.ng courses in the fall semester, 2004. to undergraduate comput.r sci.nce students at Lewis & Clark College and to a mix of undergraduate and graduate comput.r sci.nce students at the University of Arkansas. We identify a set of six knowledge areas that can help to structure course material in grid comput.ng. In conclusion, we recommend that a grid comput.ng course cover, or have as prerequisites, material on (1) remote method invocation and (2) security and certificates. Finally, student comments indicate the need for a series of grid programming exercises of increasing complexity.

关键词： Grid comput.ng comput.r sci.nce Educational institutions Protocols comput.r industry Education Hardware Curriculum development Operating systems Java

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Image Watermarking Algorithm Based on Quantization and Integer Wavelet Transform

Image Watermarking Algorithm Based on Quantization and Integ...

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Congress on Image and Signal Processing, CISP

作者： Chen Gang Ning Chen An-feng Hu Coll. of Math. & Comput. Sci. Jianghan Univ. Wuhan China Sch. of Inf. Sci. & Eng. Central South Univ. Changsha China

Geometric attacks are difficult to resist for watermarking algorithms. Although most existing geometric-resisted algorithms can resist some kinds of geometric attacks, however, their robustness to common image processing is weak. A watermarking algorithm which is both strongly robust to geometric attacks and common image processing was proposed in this paper. Watermarking messages combined a Gaussian-noise template were embedded to vertical high frequency coefficients which were produced by one-level integer wavelet transform of the host image. Then the same messages were embedded to each sub-image by quantization repeatedly. Two watermarking images were extracted by correlation calculation and majority rule. Finally, the ultimate watermarking was decided by a judge rule. Experiment results show the algorithm is both robust to geometric attacks and common image processing, meanwhile, the imperceptibility of the algorithm can meet the request.

关键词： Watermarking Quantization Wavelet transforms Image processing Resists Wavelet domain Noise robustness Image coding Pixel Educational institutions

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A Reputation-Based Method to Secure Inter-Domain Routing

A Reputation-Based Method to Secure Inter-Domain Routing

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IEEE International Conference on High Performance comput.ng and Communications (HPCC)

作者： Na Wang Bin-Qiang Wang State Key Lab. of Math. Eng. & Adv. Comput. Zhengzhou Inf. Sci. & Technol. Inst. Zhengzhou China

Due to the lack of the mechanism within BGP to verify the authority of an Autonomous System (AS) to announce Network Layer Reachable Information (NLRI), a specific IP prefix may be hijacked by a suspicious AS, leading to Internet instability even crash. Current proposals either are still no widely deployed for expensive overhead and complex key management, such as S-BGP, soBGP, etc, or can be incrementally deployed but not timely response and block attacks, just detect anomalies and rely on manual response from network operators, such as iSPY, PHAS, etc. The paper proposed an autonomous system origination reputation model to evaluate the trust degree of an autonomous system (AS) on originating the prefix. As a result, an AS selectively prefers the route announcement originated by the AS with higher origination reputation, prefix hijacking would be suppressed from happening. According to the beta reputation theory, the origination reputation of an AS is comput.d based on results of multiple prefix hijacking detection systems, by removing false positives and false negatives of detection systems. And the origination reputation is updated following the "slowly rising, quickly falling" principle. In the end, the validity of the model is verified by simulation experiments.

关键词： Routing Internet Accuracy Negative feedback IP networks comput.tional modeling Conferences

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Combining Classification and Clustering for Tweet Sentiment Analysis

Combining Classification and Clustering for Tweet Sentiment ...

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Brazilian Conference on Intelligent Systems (BRACIS)

作者： Luiz F. S. Coletta Nadia F. F. da Silva Eduardo Raul Hruschka Estevam Rafael Hruschka Inst. of Math. & Comput. Sci. Univ. of Sao Paulo (USP) Sao Carlos Brazil Inst. of Math. & Comput. Sci. Univ. of Sao Paulo (USP) at Sao Carlos Sao Carlos Brazil Institute of Mathematics and Computer Science University of Sao Paulo (USP) Sao Carlos Brazil Federal University of Sao Carlos (UFSCAR) Brazil

The goal of sentiment analysis is to determine opinions, emotions, and attitudes presented in source material. In tweet sentiment analysis, opinions in messages can be typically categorized as positive or negative. To classify them, researchers have been using traditional classifiers like Naive Bayes, Maximum Entropy, and Support Vector Machines (SVM). In this paper, we show that a SVM classifier combined with a cluster ensemble can offer better classification accuracies than a stand-alone SVM. In our study, we employed an algorithm, named C3E-SL, capable to combine classifier and cluster ensembles. This algorithm can refine tweet classifications from additional information provided by clusterers, assuming that similar instances from the same clusters are more likely to share the same class label. The resulting classifier has shown to be competitive with the best results found so far in the literature, thereby suggesting that the studied approach is promising for tweet sentiment classification.

关键词： Support vector machines Training Clustering algorithms Sentiment analysis Accuracy Classification algorithms Twitter

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Data-parallel compilation and query power extension of large knowledge bases

Data-parallel compilation and query power extension of large...

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： A.K. Bansal J.L. Potter L.V. Prasad Dept. of Math. & Comput. Sci. Kent State Univ. OH USA Department of Mathematics and Computer Science Kent University Kent OH USA

An associative data-parallel compilation model of logic programs capable of answering queries with unspecified relations concerning the given objects is described. The model benefits from the synergy resulting from associative search, data-parallelism during goal reduction, and the use of low-level code to invoke the subgoals and savings in data-transfers resulting from the presence of global registers. The use of associative tables extends the power of logic programming to answer a large class of queries and derive unspecified relation-names for the given objects. In contrast to the interpretation based on a pure data parallel model, this model does not suffer from data sequentiality caused by the presence of multiple-occurrence variables in the goals. The model also handles variable aliasing in the clauses efficiently using the associative data-parallel search and data-parallel assignment property.< >

关键词： Pattern matching Supercomput.rs Artificial intelligence Logic programming math.matics comput.r sci.nce math.matical model Parallel processing Registers Knowledge representation

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Trinomial curves with many rational points

Trinomial curves with many rational points

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IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： P. Beelan R. Pellikaan Dept. of Math. & Comput. Sci. Tech. Univ. of Eindhoven Netherlands Department of Mathematics and Computing Science Technical University Eindhoven Eindhoven Netherlands

The authors discuss a method to get plane curves with many rational points and a construction to get asymptotically good codes and curves, that is closely related to finding bivariate polynomials representing designs. The number of rational points and the genus is comput.d for plane curves that have a defining equation with three monomials.

关键词： Polynomials Equations math.matics H infinity control

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A proof theory for asynchronously communicating real-time systems

A proof theory for asynchronously communicating real-time sy...

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Real-Time Systems Symposium (RTSS)

作者： P. Zou J. Hooman Dept. of Math. & Comput. Sci. Eindhoven Univ. of Technol. Netherlands Department of Mathematics and Computing Science Eindhovan University of Technology Eindhoven Netherlands

A compositional proof system is presented to axiomatize the real-time behavior of asynchronously communicating processes. programs are written in a real-time version of CSP where processes asynchronously send and receive messages along channels that are capable of buffering an arbitrary number of messages. Timing properties are expressed in explicitly clock temporal logic, which extends linear temporal logic with a special time variable, referring to a global clock.< >

关键词： Real time systems Logic comput.r languages Clocks Timing Delay effects Synchronization Reactive power math.matics Ear

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Performance Comparison of Secure Comparison Protocols

Performance Comparison of Secure Comparison Protocols

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International Workshop on Database and Expert Systems Applications

作者： Florian Kerschbaum Debmalya Biswas Sebastiaan de Hoogh SAP Research Karlsruhe Germany Dept. of Math. & Comput. Sci Tech. Univ. Eindhoven Eindhoven Netherlands

Secure multiparty comput.tion (SMC) has gained tremendous importance with the growth of the Internet and e-commerce, where mutually untrusted parties need to jointly comput. a function of their private inputs. However, SMC protocols usually have very high comput.tional complexities, rendering them practically unusable. In this paper, we tackle the problem of comparing two input values in a secure distributed fashion. We propose efficient secure comparison protocols for both the homomorphic encryption and secret sharing schemes. We also give experimental results to show their practical relevance.

关键词： Protocols Cryptography Sliding mode control Arithmetic Databases Expert systems Application software math.matics comput.r sci.nce Internet

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QUATERNION GENERALIZED SINGULAR VALUE DECOMPOSITION AND ITS APPLICATIONS

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Applied math.matics(A Journal of Chinese Universities) 2006年第1期21卷 113-118页

作者： Jiang Tongsong Liu Yonghui Wei Musheng Dept. of Math. Linyi Normal Univ. Shandong 276005China Dept. of Comput. Sci. and Tech. Shandong Univ. Jinan 250100 China. Dept. of Math. East China Normal Univ. Shanghai 200062China

This paper derives a theorem of generalized singular value decomposition of quaternion matrices （QGSVD）,studies the solution of general quaternion matrix equation AXB -CYD= E,and obtains quaternionic Roth＇s theorem. This paper also suggests sufficient and necessary conditions for the existence and uniqueness of solutions and explicit forms of the solutions of the equation.

关键词： QGSVD quaternion matrix equation Roth＇s theorem.

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Modeling human visual object recognition

Modeling human visual object recognition

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International Joint Conference on Neural Networks (IJCNN)

作者： S. Edelman H.H. Bulthoff Department of Applied Mathematics and Computer Science Weizmann Institute of Science Rehovot Israel Dept. of Appl. Math. & Comput. Sci. Weizmann Inst. of Sci. Rehovot Israel

The topics discussed here are network models of object recognition; a comput.tional theory of recognition; psychophysical support for a view-interpolation model: and an open issue, features of recognition. The authors survey a successful replication of central characteristics of performance in 3-D object recognition by a comput.tional model based on interpolation among a number of stored views of each object. Network models of 3-D object recognition based on interpolation among specific stored views behave in several respects similarly to human observers in a number of recognition tasks. Even closer replication of human performance in recognition should be expected, once the issue of the features used to represent object views is resolved.< >

关键词： Humans Object recognition Image recognition comput.r networks Biology comput.ng math.matics comput.r sci.nce math.matical model Interpolation Image resolution

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