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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Ping Chen Wei Ding Chris Bowes David Brown Department of Computer and Math. Sciences University of Houston Downtown USA Department of Computer Science University of Massachusetts Boston USA

Knowledge plays a central role in intelligent systems. Manual knowledge acquisition is very inefficient and expensive. In this paper, we present (1) an automatic method to acquire a large amount of lexical-dependency knowledge, and (2) an innovative knowledge representation model to effectively minimize the impact of noise and improve knowledge quality. We also propose a new type of knowledge base evaluation-extrinsic evaluation, which evaluates knowledge by its impact to an external application. In our experiments we adopt word sense disambiguation (WSD) as the extrinsic evaluation measure. Due to the lack of sufficient knowledge, existing WSD methods either are brittle and only capable of processing a limited number of topics or words, or provide only mediocre performance in real-world settings. With the support of acquired knowledge, our unsupervised WSD system significantly outperformed the best unsupervised systems participating in SemEval 2007, and achieved the disambiguation accuracy approaching top-performing supervised systems.

关键词： Large-scale systems Knowledge acquisition Artificial intelligence Intelligent systems Sleep Knowledge representation Buildings Intelligent structures Application software Computational linguistics

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Flip Graphs of Bounded-Degree Triangulations

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Electronic Notes in Discrete math.matics 2009年 34卷 509-513页

作者： Aichholzer, O. Hackl, T. Orden, D. Ramos, P. Rote, G. Schulz, A. Speckmann, B. Institute for Software Technology TU Graz Austria Dep. de Matemáticas Univ. de Alcalá Spain Institut für Informatik Freie Universität Berlin Germany Computer Science Department Smith College United States Dep. of Math. and Computer Science TU Eindhoven Netherlands

We study flip graphs of triangulations whose maximum vertex degree is bounded by a constant k. Specifically, we consider triangulations of sets of n points in convex position in the plane and prove that their flip graph is connected if and only if k > 6;the diameter of the flip graph is O (n ²). We also show that for general point sets, flip graphs of triangulations with degree ≤k can be disconnected for any k. © 2009 Elsevier B.V. All rights reserved.

关键词： degree bound flip graph flipping distance triangulation

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Belief rule-based inference methodology to improve nuclear safeguards information evaluation

Belief rule-based inference methodology to improve nuclear s...

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： Da Ruan Roland Carchon Klaas van der Meer Jun Liu Hui Wang Luis Martinez Department of Applied Math. and Computer Science Ghent University Ghent Belgium Belgian Nuclear Research Center SCK CEN Ghent Belgium Belgian Nuclear Research Center SCK CEN School of Computing and Math. University of Ulster UK Department of Computer Science and Engineering Faculty of Electrical Engineering University of Jaen Jaen Spain

A framework for modeling, analyzing and synthesizing nuclear safeguards information with various uncertainties is proposed by using a newly developed belief rule-base inference methodology (RIMER). After a hierarchical analysis of States' nuclear activities on the basis of the International Atomic Energy Agency (IAEA) physical model, the multi-layer structure of the evaluation model for States' nuclear activities is outlined. The special emphasis is given to the synthesis and evaluation analysis of the physical model indicator information by RIMER, which handles hybrid uncertain information in nuclear safeguards evaluation process. The proposed framework illustrates and clarifies the inference and synthesis formalism from a case study of nuclear safeguards information evaluation.

关键词： Information analysis Erbium computer science Uncertainty Fuzzy logic Nuclear fuels Protocols Information processing Decision making Production systems

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Merging Conflicting Propositional Knowledge by Similarity

Merging Conflicting Propositional Knowledge by Similarity

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Steven Schockaert Henri Prade Department of App. Math. and Computer Science Ghent University Ghent Belgium IRIT CNRS Toulouse University University Paul Sabatier Toulouse France

The paper discusses a new approach to merging conflicting propositional knowledge bases which builds on the idea that consistency can often be restored by interpreting propositions more flexibly, thus enlarging their ... 详细信息

关键词： Merging Weather forecasting Artificial intelligence Hamming distance Fellows Web services Clouds

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Counting Homomorphisms to Sparse Graphs

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Electronic Notes in Discrete math.matics 2009年 34卷 393-397页

作者： Nešetřil, Jaroslav de Mendez, Patrice Ossona Department of Applied Mathematics Institute for Theoretical Computer Science Charles University Prague Czech Republic Centre d'Analyse et de Mathématique Sociales C.N.R.S. E.H.E.S.S. Paris France

We define nowhere dense and somewhere dense classes by means of counting of homomorphisms from test graphs. This seems to be bridging the gap between existential and counting theorems (for graph homomorphisms) and it ... 详细信息

关键词： boolean query counting graph homomorphism nowhere dense class tree-depth

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A New LSB Matching Steganographic Method Based on Steganographic Information Table

A New LSB Matching Steganographic Method Based on Steganogra...

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International Workshop on Intelligent Networks and Intelligent Systems (ICINIS)

作者： Yu Qiudong Xiao-wei Liu Department of Computer Science & Technology Tianjin Agricultural University China Department of Computer Science&Technology Tianjin Agriculture University China Dept. of Math. & Comput. Sci. Jiangxi Inst. of Educ. Nanchang China

Based on the researches of LSB (least significant bit, i.e. the last bit of a binary pixel value) matching steganographic method and the steganalytic method which aims at histograms of cover images, this paper proposes a new LSB matching steganographic method. A steganographic information table is defined to record the changes which are introduced by the embedded secrete bits. According to the table, the next LSB which has the same pixel value will be judged to add or subtract one dynamically in order to ensure the histogram's change of cover image is minimized. Therefore, the modified method improves steganographic security and is less vulnerability to attacks compared with LSB matching. The experimental results show that the histograms maintain their attributes, such as peak values and alternative trends, in an acceptable degree and have better performance than LSB matching in the respects of histogram distortion and resistance against existing steganalysis.

关键词： Steganography Histograms Gray-scale Intelligent networks Payloads Information security Humans Eyes Streaming media Intelligent systems

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Improving Dense Linear Equation Solver on Hybrid CPU-GPU System

Improving Dense Linear Equation Solver on Hybrid CPU-GPU Sys...

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International Symposium on Parallel Architectures, Algorithms and Networks (ISPAN)

作者： Zhichao Cao Shiming Xu Wei Xue Wenguang Chen Department Computer Science & Technology Tsinghua University Beijing China Delft Institute Applied Math Technical University Delft Delft Netherlands

In recent years, GPU (Graphic Processor Unit) has become an import accelerator for conventional applications. User has to program in GPU-based environments, such as CUDA, and it usually requires detailed tuning for good performances. Also since GPU has high Single Precision (SP) performance while its Double Precision (DP) performance falls short, it has limited application in scientific computing. In this paper, our algorithm aims at accelerating the solving of dense linear equation on hybrid CPU-GPU system. We adopt iterative refinement to utilize the high SP capability of GPUs while achieving DP precision requirements. Specifically, we implement algorithm with utilize both GPU and CPU for computation-intensive parts by overlapping computations. Its performance reaches up to 236 GFLOP/s, which is by far better than the result achieved by DP-only algorithms.

关键词： Equations Iterative algorithms Linear systems Graphics Scientific computing Performance analysis Algorithm design and analysis Parallel processing Acceleration Numerical stability

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Approximation, Randomization, and Combinatorial Optimization: Algorithms and Techniques - 12th InternationalWorkshop, APPROX 2009 and 13th International Workshop, RANDOM 2009 Berkeley, CA, USA, August 21-23, 2009 Proceedings. Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2009年 5687 LNCS卷 V-VII页

作者： Dinur, Irit Jansen, Klaus Naor, Joseph Rolim, José Weizmann Institute of Science Dept. of Applied Math and Computer Science Rehovot 76100 Israel University of Kiel Institute for Computer Science and Applied Mathematics Olshausenstr. 40 24098 Kiel Germany Technion Computer Science Department Haifa 32000 Israel University of Geneva Centre Universitaire d'Informatique Battelle Bat. A 7 rte de Drize 1227 Carouge Switzerland

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Efficient algorithms for implementation of hysteresis models

Efficient algorithms for implementation of hysteresis models

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Behavior and Mechanics of Multifunctional Materials and Composites 2009

作者： Downen, L. Glover, T. Hallock, L. King, S. Shor, J. Wallace, J. Smith, R.C. Dept. of Math. Center for Research in Scientific Computation NCSU Raleigh NC 27695 United States Dept. of Mathematics and Computer Science Albany State University Albany GA 31705 United States Department of Mathematics University of Wisconsin - La Crosse La Crosse WI 54601 United States Department of Mathematics Princeton University Princeton NJ 08544 United States Department of Mathematics VA Tech Blacksburg VA 24060 United States

ISBN: (纸本)9780819475497

The homogenized energy model characterizes hysteresis in ferroelectric, ferromagnetic and ferroelastic compounds through a combination of energy analysis at the lattice level and stochastic homogenization techniques to provide macroscopic constitutive relations. Whereas this framework can characterize the frequency, stress and temperature dependent dynamics of these compounds for a variety of operating regimes, the direct implementation of the model is often not sufficiently efficient for applications requiring high speed simulation, model identification, or control implementation. Here we discuss techniques to increase the efficiency of algorithms for forward simulations and parameter identification. This significantly enhances the capability of the model for uncertainty analysis, sensitivity analysis, model calibration, device design, and model-based control implementation. © 2009 SPIE.

关键词： Uncertainty analysis

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Measuring visual discomfort associated with 3D displays

Measuring visual discomfort associated with 3D displays

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Stereoscopic Displays and Applications XX

作者： Lambooij, M. Fortuin, M. IJsselsteijn, W.A. Heynderickx, I. Human-Technology Interaction Group Department of Industrial Engineering and Innovation Sciences Eindhoven University of Technology Eindhoven Netherlands Group Visual Experiences Philips Research Laboratories Eindhoven Netherlands Department of Optometry Hogeschool Utrecht University of Applied Science Utrecht Netherlands Henry Welcome Laboratories for Vision Sciences Department of Optometry and Visual Science City University London United Kingdom Dept. Mediamatics - Hum. Comp. Interac. Electron. Eng. Math. and Comp. Sci. Delft University of Technology Delft Netherlands

Some people report visual discomfort when watching 3D displays. For both the objective measurement of visual fatigue and the subjective measurement of visual discomfort, we would like to arrive at general indicators that are easy to apply in perception experiments. Previous research yielded contradictory results concerning such indicators. We hypothesize two potential causes for this: 1) not all clinical tests are equally appropriate to evaluate the effect of stereoscopic viewing on visual fatigue, and 2) there is a natural variation in susceptibility to visual fatigue amongst people with normal vision. To verify these hypotheses, we designed an experiment, consisting of two parts. Firstly, an optometric screening was used to differentiate participants in susceptibility to visual fatigue. Secondly, in a 22 within-subjects design (2D vs 3D and two-view vs nine-view display), a questionnaire and eight optometric tests (i.e. binocular acuity, fixation disparity with and without fusion lock, heterophoria, convergent and divergent fusion, vergence facility and accommodation response) were administered before and immediately after a reading task. Results revealed that participants found to be more susceptible to visual fatigue during screening showed a clinically meaningful increase in fusion amplitude after having viewed 3D stimuli. Two questionnaire items (i.e., pain and irritation) were significantly affected by the participants' susceptibility, while two other items (i.e., double vision and sharpness) were scored differently between 2D and 3D for all participants. Our results suggest that a combination of fusion range measurements and self-report is appropriate for evaluating visual fatigue related to 3D displays. © 2009 SPIE-IS&T.

关键词： Three dimensional displays

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