(A more complete list can be seen at DBLP.)


Visualizing Large-Scale Earthquake Simulations

Kwan-Liu Ma, Aleksander Stompel, Jacobo Bielak, Omar Ghattas, and Eui Joong Kim

In Proceedings of Supercomputing 2003 Conference
November, 2003, pp. 48-61

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This paper presents a parallel adaptive rendering algorithm and its performance for visualizing time-varying unstructured volume data generated from large-scale eathquake simulations. The objective is to visualize 3D seismic wave propagation generated from an 0.5 Hz simulation of the Northridge earthquake, which is the highest resolution volume... ...


Visual-based Anomaly Detection for BGP Origin AS Change (OASC) Events

Soon Tee Teoh, Kwan-Liu Ma, Felix Wu, Dan Massey, Xiao-Liang Zhao, Dan Pei, Lan Wang, Lixia Zhang, and Randy Bush

In Proceedings of the 14th IFIP/IEEE Workshop on Distributed Systems: Operations and Management
October, 2003, pp. 155-168

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Instead of relying completely on machine intelligence in anomaly event analysis and correlation, in this paper, we take one step back and investigate the possibility of a human-interactive visual-based anomaly detection system for faults and security attacks related to the BGP (Border Gateway Protocol) routing protocol. In particular, we have built and tested a program, based on fairly simple information visualization techniques, to navigate interactively real-life BGP OASC (Origin AS Change) events ...


A Novel Interface for Higher-Dimensional Classification of Volume Data

Fan-Yin Tzeng, Eric Lum, and Kwan-Liu Ma

In Proceedings of IEEE Visualization 2003 Conference
October, 2003, pp. 505-512

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In the traditional volume visualization paradigm, the user specifies a transfer function that assigns each scalar value to a color and opacity by defining an opacity and a color map function. The transfer function has two limitations. First, the user must define curves based on histogram and value rather than seeing and working with the volume itself. Second, the transfer function is inflexible in classifying regions of interest, where values at a voxel such as intensity and gradient are used to differentiate material, not taking into account additional properties such as texture and position ...


Visualizing Industrial CT Volume Data for Nondestructive Testing Applications

Runzhen Huang, Kwan-Liu Ma, Patrick McCormick, and William Ward

In Proceedings of IEEE Visualization 2003 Conference
October, 2003, pp. 547-554

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This paper describes a set of techniques developed for the visualization of high-resolution volume data generated from industrial computed tomography for nondestructive testing (NDT) applications. Because the data are typically noisy and contain ne features, direct volume rendering methods do not always give us satisfactory results. We have coupled region growing techniques and a 2D histogram interface to facilitate volumetric feature extraction. ...


Recent Advances in Hardware-Accelerated Volume Rendering

Eric Lum, Kwan-Liu Ma, and Shigeru Muraki

Computers and Graphics
Volume 27, Number 5, October, 2003, pp. 725-734

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The programmability and texture support of consumer graphics accelerators have drawn a lot of attention from visualization researchers, resultingin some very important advances in interactive volume data visualization. For many applications, scientists can now perform routine data visualization and analysis tasks on their desktop PC with a consumer graphics card that was designed mainly for playing video games. This paper presents several representative hardware-accelerated algorithms that have been introduced recently to address the problems of classification, illumination, non-photorealistic rendering, decoding, and image compositing in volume data visualization ...


A Visual Exploration Process for the Analysis of Internet Routing Data

Soon Tee Teoh, Kwan-Liu Ma, and S. Felix Wu

In Proceedings of IEEE Visualization 2003 Conference
October, 2003, pp. 523-530

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The Internet pervades many aspects of our lives and is becoming indispensable to critical functions in areas such as commerce, government, production and general information dissemination. To maintain the stability and efficiency of the Internet, every effort must be made to protect it against various forms of attacks, malicious uses, and errors. A key component in the Internet security effort is the routine examination of Internet routing data, which unfortunately can be too large ...


RGVis: Region Growing Based Techniques for Volume Visualization

Runzhen Huang and Kwan-Liu Ma

In Proceedings of Pacific Graphics 2003 Conference
October, 2003, pp. 355-363

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Interactive data visualization is inherently an iterative trial-and-error process searching for an ideal set of parameters for classifying and rendering features of interest in the data. This paper presents 3-d region growing based techniques that can assist the users to locate and define features of interest in volume data more quickly and more accurately. One technique employs partial region growing to generate a 2-d transfer function that effectively reveals the full features of interest ...


MoireGraphs: Radial Focus+Context Visualization and Interaction for Graphs with Visual Nodes

T.J. Jankun-Kelly and Kwan-Liu Ma

In Proceedings of 2003 Symposium on Information Visualization
October, 2003, pp. 8-15

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Graph and tree visualization techniques enable interactive exploration of complex relations while communicating topology. However, most existing techniques have not been designed for situations where visual information such as images is also present at each node and must be displayed. This paper presents MoireGraphs to address this need. MoireGraphs combine a new focus+context radial graph layout with a suite of interaction techniques (focus strength changing, radial rotation, level highlighting, secondary foci, animated transitions and node information) to assist in the exploration of graphs with visual nodes ...


SLIC: Scheduled Linear Image Compositing for Parallel Volume Rendering

Aleksander Stompel, Kwan-Liu Ma, Eric Lum, James Ahrens, and John Patchett

In Proceedings of 2003 IEEE Symposium on Parallel and Large-Data Visualization
October, 2003, pp. 6-12

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Parallel volume rendering o ers a feasible solution to the large data visualization problem by distributing both the data and rendering calculations among multiple computers connected by a network. In sort-last parallel volume rendering, each processor generates an image of its assigned subvolume, which is blended together with other images to derive the final image. Improving the efficiency of this compositing step, which requires interprocesssor communication, is the key to scalable, interactive rendering ...


A PC Cluster System for Simultaneous Interactive Volumetric Modeling and Visualization

Shigeru Muraki, Eric Lum, Kwan-Liu Ma, Masato Ogata, and Xuezhen Liu

In Proceedings of 2003 IEEE Symposium on Parallel and Large-Data Visualization
October, 2003, pp. 13-20

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A number of problems are well suited for volumetric representation for both simulation and storage, however, the large amount of data that needs to be processed and rendered with these volumes makes interactive manipulation extremely challenging. In this paper, we present a scalable PC cluster system (VG cluster) designed specifically to enable simultaneous volumetric computation and visualization, using compositing hardware devices and the latest PC graphics accelerators ...


PaintingClass: Interactive Construction, Visualization and Exploration of Decision Trees

Soon Tee Teoh and Kwan-Liu Ma

In Proceedings of 9th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining (KDD 2003)
August, 2003, pp. 667-672

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Decision trees are commonly used for classification. We propose
to use decision trees not just for classification but also for the wider purpose of knowledge discovery, because visualizing the decision tree can reveal much valuable information in the data. We introduce PaintingClass, a system for interactive construction, visualization and exploration of decision trees. PaintingClass provides an intuitive layout and convenient navigation of the decision tree ...


The Design and Evaluation of a Piplined Image Compositing Device for Massively Parallel Volume Rendering

Masato Ogata, Shigeru Muraki, Xuezhen Liu, and Kwan-Liu Ma

In Proceedings of International Workshop on Volume Graphics
July, 2003, pp. 61-68

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An experimental study of software image compositing that we have carried out on a 512-node PC cluster shows the necessity of hardware compositing support to make possible real-time volume visualization scalable with large PC clusters. This paper describes the design and performance evaluation of such a hardware image compositing device. A PC cluster using such devices along with commodity graphics cards can enable simultaneous simulation and volume visualization ...


Kinetic Visualization

Eric Lum, Aleksander Stompel, and Kwan-Liu Ma

IEEE Transactions on Visualization and Graphics
Volume 9, Number 2, April - June, 2003, pp. 115-126

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In this paper we present a novel visualization technique – kinetic visualization – that uses motion along a surface to aid in the perception of 3D shape and structure of static objects. The method uses particle systems, with rules such that particles flow over the surface of an object to not only bring out, but also attract attention to information on a shape that might not be readily visible with a conventional rendering method which uses lighting and view changes ...


VisPortal: Deploying Grid-enabled Visualization Tools Through a Web-portal Interface

Wes Bethel, Cristina Siegrist, John Shalf, Praveenkumar Shetty, T.J. Jankun-Kelly, Oliver Kreylos, and Kwan-Liu Ma

In Proceedings of 3rd Annual Workshop on Advanced Collaborative Environments
June, 2003

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The LBNL/NERSC Visportal effort explores ways to deliver advanced Remote/Distributed Visualization(RDV) capabilities through a Grid-enabled web-portal interface. The effort focuses on latency tolerant distributed visualization algorithms, GUI designs that are more appropriate for the capabilities of web interfaces, and refactoring parallel-distributed applications to work in a N-tiered component deployment strategy. Most importantly, our aim is to leverage commercially supported technology as much as possible in order to create a deployable, supportable, and hence viable platform for delivering grid-based visualization services to collaboratory users ...


Starclass: Interactive Visual Classification Using Star Coordinates

Soon Tee Teoh and Kwan-Liu Ma

In Proceedings of 3rd SIAM International Conference on Data Mining
May, 2003, pp. 178-185

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Classification operations in a data-mining task are often performed using decision trees. The visual-based approach to decision tree construction has gained increasing popularity. We present StarClass, a new interactive visual classification method. This method maps multi-dimensional data to the visual display using star coordinates, allowing the user to interact with the display to create a decision tree. Preliminary evaluation indicates that this new technique is as effective as state-of-the-art algorithmic classification methods, and more effective than the previous visual-based methods ...


An Interactive Isosurface Visualization Cluster

Conrad Tse, Soon Tee Teoh, and Kwan-Liu Ma

In Proceedings of High Performance Computing 2003
April, 2003, pp. 178-183

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Extraction and rendering of isosurfaces from large volume data is a computationally expensive task. To achieve interactive isosurface visualization, we have developed a parallel isosurface extraction pipeline, which couples the extraction process with a multiresolution strategy to relieve the host PC from the isosurface transport and rendering bottlenecks. Such an isosurface visualization cluster design can scale with the problem size. The paper presents a comprehensive study of the interplay between the compute nodes (a PC cluster), the host node (a graphics-enhanced PC), the data (voxels and triangles), and user actions (isovalue and view changes) to derive a resource-conscious, user-centered metric for designing effective solutions for large-scale isosurface visualization ...


Deploying Web-Based Visual Exploration Tools on the Grid

T.J. Jankun-Kelly, Oliver Kreylos, Kwan-Liu Ma, Bernd Hamann, Kenneth I. Joy, John Shalf, and E. Wes Bethel

IEEE Computer Graphics and Applications
Volume 23, Number 2, March/April, 2003, pp. 40-50

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Grid-based computing facilitates access to different resources. But management in a grid-based environment isn't centralized. To use grid resources effectively, researchers need a central access point to manage the resources, provide a visual means to explore the data, and record these explorations for further investigation and dissemination. This article describes such a system that's being developed jointly by the University of California, Davis, and the Lawrence Berkeley National Laboratory (LBNL). ...


Visualizing Time-Varying Volume Data

Kwan-Liu Ma

IEEE Computing in Science and Engineering
Volume 5, Number 2, March, 2003, pp. 34-42

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This article reviews strategies developed so far for enabling interactive visualization of volume data from time-varying simulations with a focus on encoding, feature extraction, and rendering issues. The author also discusses emerging trends in time-varying data visualization research and their potential impact on the scientific research community ...


The Design and Evaluation of a High-Performance Image Compositing Hardware Device

Masato Ogata, Shigeru Muraki, Xuezhen Liu, and Kwan-Liu Ma

IEICE Transactions, the Institute of Electronics, Information, and Communication Engineers
Number 2, February, 2003, pp. 290-301

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(in Japanese)