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Why interval arithmetic is so useful

Why interval arithmetic is so useful

引用

2nd Workshop of the DFG's International Research Training Group on visualization of Large and Unstructured data Sets - Applications in Geospatial Planning, Modeling, and Engineering, VLUDS 2007

作者： Hijazi, Younis Hagen, Hans Hansen, Charles Joy, Kenneth I. Department of Computer Sciences University of Kaiserslautern and IRTG 1131 D-67653 Kaiserslautern Germany SCI Institute University of Utah United States Computer Science Department Institute for Data Analysis and Visualization University of California Davis United States

ISBN: (纸本)9783885794417

Interval arithmetic was introduced by Ramon Moore [Moo66] in the 1960s as an approach to bound rounding errors in mathematical computation. The theory of interval analysis emerged considering the computation of both the exact solution and the error term as a single entity, i.e. the interval. Though a simple idea, it is a very powerful technique with numerous applications in mathematics, computer science, and engineering. In this survey we discuss the basic concepts of interval arithmetic and some of its extensions, and review successful applications of this theory in particular in computer science.

关键词： Computation theory

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CFD simulation of liquid-liquid extraction columns and visualization of eulerian datasets

CFD simulation of liquid-liquid extraction columns and visua...

引用

International Research and Training Group 1131 Workshop on visualization of Large and Unstructured data Sets: Applications in Geospatial Planning, Modeling and Engineering, VLUDS 2011

作者： Hlawitschka, Mark W. Chen, Fang Bart, Hans-Jörg Hamann, Bernd Department of Separation Science and Technology University of Kaiserslautern Germany Computer Graphics and HCI Group University of Kaiserslautern Germany CS Department Institute for Data Analysis and Visualization University of California Davis United States 2 University of Kaiserslautern Germany

ISBN: (纸本)9783939897460

In this joint work, a complete framework for modeling, simulating and visualizing multiphase fluid flow within an extraction column is presented. We first present a volume-of-fluid simulation, which is able to predict the surface of the droplets during coalescence. However, a fast and efficient model is needed for the simulation of a liquid-liquid extraction column due to the high number of occurring droplets. To simulate the velocity and droplet size in a DN32 extraction column, a coupled computational fluid dynamic-population balance model solver is used. The simulation is analyzed using path-line based visualization techniques. A novel semi-automatic re-seeding technique for droplet path-line integration is proposed. With our technique, path-lines of fluid droplets can be re-initialized after contact with the stirring devices. The droplet breakage is captured, allowing the engineer to improve the design of liquid-liquid columns layout.

关键词： Computational fluid dynamics

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Exploring Uncertainty in Image Segmentation Ensembles

Exploring Uncertainty in Image Segmentation Ensembles

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20th Eurographics/IEEE VGTC Conference on visualization, EuroVis 2018

作者： Fröhler, B. Möller, T. Weissenböck, J. Hege, H.-C. Kastner, J. Heinzl, C. Research Group Computed Tomography University of Applied Sciences Upper Austria Austria Visualization and Data Analysis Research Group Faculty of Computer Science University of Vienna Austria Visual Data Analysis Department Zuse Institute Berlin Germany

ISBN: (纸本)9783038680659

Finding the most accurate image segmentation involves analyzing results from different algorithms or parameterizations. In this work, we identify different types of uncertainty in this analysis that are represented by the results of probabilistic algorithms, by the local variability in the segmentation, and by the variability across the segmentation ensemble. We propose visualization techniques for the analysis of such types of uncertainties in segmentation ensembles. For a global analysis we provide overview visualizations in the image domain as well as in the label space. Our probability probing and scatter plot based techniques facilitate a local analysis. We evaluate our techniques using a case study on industrial computed tomography data. © 2018 The Author(s)

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POSTER: Will Sentiment of Forex News Effect Forecast of the RMB Exchange Rate? 16

POSTER: Will Sentiment of Forex News Effect Forecast of the ...

引用

16th ACM International Conference on Computing Frontiers, CF 2019

作者： Cheng, Zhou Wang, Jixiang Qi, Tianmei Zhao, Junfeng Wang, Zhihong Guo, Yi Zhou, Yu Co. Ltd Shanghai China Department of Computer Science and Engineering East China University of Science and Technology Shanghai China Business Intelligence and Visualization Research Center National Engineering Laboratory for Big Data Distribution and Exchange Technologies Shanghai China

ISBN: (纸本)9781450366854

The forecast and analysis of the trend of the RMB exchange rate have been deeply explored by many researchers in the financial field, but the combination of public opinion sentiment data and historical market data to forecast the RMB exchange rate in the short term has been studied little. With the rapid development of the Internet, the influence of public opinion sentiment on the economy and society is increasing. Online public opinion sentiment data not only have an impact on stock prices [1] and commodity prices, but also have a significant impact on foreign exchange (Forex) rates. However, the public opinion data are not applied for the RMB exchange rate forecast, because the impact of public events on the exchange rate is ignored. Besides, the lack of exact temporal sliding window of public opinion ignores its timeliness and sensibility. © 2019 Association for Computing Machinery.

关键词： Forecasting

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Evolutionary morphing

Evolutionary morphing

引用

VIS 05: IEEE visualization 2005, Proceedings

作者： Wiley, David F. Amenta, Nina Alcantara, Dan A. Ghosh, Deboshmita Kil, Yong J. Delson, Eric Harcourt-Smith, Will Rohlf, F. James John, Katherine St. Hamann, Bernd Institute for Data Analysis and Visualization Department of Computer Science University of California Davis American Museum of Natural History Lehman College City University of New York Department of Ecology and Evolution State University of New York Stony Brook

ISBN: (纸本)0780394623

We introduce a technique to visualize the gradual evolutionary change of the shapes of living things as a morph between known three-dimensional shapes. Given geometric computer models of anatomical shapes for some collection of specimens - here the skulls of the some of the extant members of a family of monkeys - an evolutionary tree for the group implies a hypothesis about the way in which the shape changed through time. We use a statistical model which expresses the value of some continuous variable at an internal point in the tree as a weighted average of the values at the leaves. The framework of geometric morphometrics can then be used to define a shape-space, based on the correspondences of landmark points on the surfaces, within which these weighted averages can be realized as actual surfaces. Our software provides tools for performing and visualizing such an analysis in three dimensions. Beginning with laser range scans of crania, we use our landmark editor to interactively place landmark points on the surface. We use these to compute a "tree-morph" that smoothly interpolates the shapes across the tree. Each intermediate shape in the morph is a linear combination of all of the input surfaces. We create a surface model for an intermediate shape by warping all the input meshes towards the correct shape and then blending them together. To do the blending, we compute a weighted average of their associated trivariate distance functions and then extract a surface from the resulting function. We implement this idea using the squared distance function, rather than the usual signed distance function, in a novel way.

关键词： Computer graphics

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Harmonic attentive multimodal neural network for movie recommendation 4

Harmonic attentive multimodal neural network for movie recom...

引用

2020 4th International Workshop on Advanced Algorithms and Control Engineering, IWAACE 2020

作者： Wang, J.X. Guo, Y. Qi, T.M. Tang, Q.F. Department of Computer Science and Engineering East China University of Science and Technology Shanghai200237 China Business Intelligence and Visualization Research Center National Engineering Laboratory for Big Data Distribution and Exchange Technologies Shanghai200436 China Shanghai Engineering Research Center of Big Data and Internet Audience Shanghai200072 China

A multimodal neural network based on harmonic self-attention was proposed for movie recommendation. This method can deal with the multi-source data and learn representations of users and items well. The multimodal neural network mainly consists of three sub-networks, ResNet, Bert, and LSTM. In addition, the harmonic self-attention mechanism can explore the user's preference from the perspective of time. Experimental results show that compared with other three latest recommendation methods, HSMNN shows better performance in terms of HR and NDCG. © Published under licence by IOP Publishing Ltd.

关键词： Long short-term memory

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Machine learning models of errors in large eddy simulation predictions of surface pressure fluctuations 47

Machine learning models of errors in large eddy simulation p...

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47th AIAA Fluid Dynamics Conference, 2017

作者： Barone, Matthew F. Fike, Jeffrey A. Chowdhary, Kamaljit S. Davis, Warren L. Ling, Julia Martin, Shawn Sandia National Labs AlbuquerqueNM87123 United States Aerosciences Department United States Extreme Scale Data Science and Analytics Department United States Scalable Analysis and Visualization Department United States Thermal/Fluids Science and Engineering Department United States Software Systems R&D Department United States

ISBN: (数字)9781624105005

ISBN: (纸本)9781624105005

We investigate a novel application of deep neural networks to modeling of errors in prediction of surface pressure fluctuations beneath a compressible, turbulent flow. In this context, the truth solution is given by Direct Numerical Simulation (DNS) data, while the predictive model is a wall-modeled Large Eddy Simulation (LES). The neural network provides a means to map relevant statistical flow-features within the LES solution to errors in prediction of wall pressure spectra. We simulate a number of flat plate turbulent boundary layers using both DNS and wall-modeled LES to build up a database with which to train the neural network. We then apply machine learning techniques to develop an optimized neural network model for the error in terms of relevant flow features. © 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Large eddy simulation

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Visual interference with a transparent head mounted display

Visual interference with a transparent head mounted display

引用

Conference on Human Factors in Computing Systems, CHI EA 2001

作者： Laramee, Robert S. Ware, Colin Department of Computer Science University of New Hampshire Durham NH 03824 United States Data Visualization Research Lab. Center for Coastal and Ocean Mapping University of New Hampshire Durham NH 03824 United States

ISBN: (纸本)1581133405

Potential perceptual problems that may occur with monocular wearable displays are binocular rivalry and visual interference. We report the results from an experiment with a monocular wearable showing that text becomes increasingly difficult to read as the background becomes more complex. Indeed subjects adopted strategies to avoid the visually complex backgrounds and thereby minimize the interference. Copyright © 2012 ACM, Inc.

关键词： Helmet mounted displays

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An evaluation of methods for linking 3D views 03

An evaluation of methods for linking 3D views

引用

ACM SIGGRAPH 2003 Symposium on Interactive 3D Graphics

作者： Plumlee, Matthew Ware, Colin Department of Computer Science University of New Hampshire Durham NH 03824 United States Data Visualization Research Lab. Center for Coastal and Ocean Mapping University of New Hampshire Durham NH 03824 United States

ISBN: (纸本)9781581136456

It is common for 3D visualization systems to provide multiple points of view to a user, but there have been many solutions to the problem of linking these views so that users can understand the spatial relationships between them. Toward developing guidelines for view-linking devices, we have carried out two experiments that compare the utility of three different classes of linking devices: a directional proxy, tethers from one view to another, and a track-up map coupling. The task we apply them to is what we call the multi-perspective identification task: subjects are asked to identify an item seen in a local, forward-looking view in the context of a global, overhead view. Our results indicate that the directional proxy is the most beneficial device, and that the track-up map coupling is also beneficial. The results suggest that tethers provide little benefit. The results also suggest that when multiple local views are present, it may be beneficial to emphasize one window as being of primary interest.

关键词： Three dimensional computer graphics

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Zooming, multiple windows, and visual working memory 02

Zooming, multiple windows, and visual working memory

引用

Working Conference on Advanced Visual Interfaces, AVI 2002

ISBN: (纸本)1581135378

Zooming and multiple windows are two techniques designed to address the focus-in-context problem. We present a theoretical model of performance that models the relative benefits of these techniques when used by humans for completing a task involving comparisons between widely separated groups of objects. The crux of the model is its cognitive component: the strength of multiple windows comes in the way they aid visual working memory. The task to which we apply our model is multiscale comparison, in which a user begins with a known visual pattern and searches for an identical or similar pattern among distracters. The model predicts that zooming should be better for navigating between a few distant locations when demands on visual memory are low, but that multiple windows are more efficient when demands on visual memory are higher, or there are several distant locations that must be investigated. To evaluate our model we conducted an experiment in which users performed a multiscale comparison task using both zooming and multiple-window interfaces. The results confirm the general predictions of our model. © 2009 ACM.

关键词： visual working memory multiple windows interaction design multiscale comparison focus-in-context multiscale zooming

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