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


A Combined Eulerian-Lagrangian Data Representation for Large-scale Applications

Franz Sauer, Jinrong Xie, and Kwan-Liu Ma

IEEE Transactions on Visualization and Computer Graphics
(Accepted for publication)

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The Eulerian and Lagrangian reference frames each provide a unique perspective when studying and visualizing results from scientific systems. As a result, many large-scale simulations produce data in both formats, and analysis tasks that simultaneously utilize information from both representations are becoming increasingly popular. However, due to their fundamentally different nature, drawing correlations between these data formats is a computationally difficult task, especially in a large-scale setting ...


Audience-Targeted Design Considerations for Effective Scientific Storytelling

Franz Sauer, Tyson Neuroth, Jacqueline Chu, and Kwan-Liu Ma

IEEE Computing in Science & Engineering
Volume 18, Number 6, November/December, 2016, pp. 68-76

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An effective visualization must be carefully designed according to its purpose. This article describes three projects focused on scientific storytelling in a different domain area and for a different target audience. The authors describe the lessons learned working in each scientific field and the techniques used to tailor the visual narrative to a specific audience type. The three projects are a visualization of particle accelerator data designed for domain scientists, a presentation of new findings from the fusion community designed for nonexpert adults, and an interactive exhibit of phytoplankton populations tailored toward museum visitors, especially children ...


Temporal Summary Images: An Approach to Narrative Visualization via Interactive Annotation Generation and Placement

Chris Bryan, Kwan-Liu Ma, and Jonathan Woodring

IEEE Transactions on Visualization and Computer Graphics
(InfoVis 2016)
October, 2016

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Visualization is a powerful technique for analysis and communication of complex, multidimensional, and time-varying data. However, it can be difficult to manually synthesize a coherent narrative in a chart or graph due to the quantity of visualized attributes, a variety of salient features, and the awareness required to interpret points of interest (POIs). We present Temporal Summary Images (TSIs) as an approach for both exploring this data and creating stories from it ...


Synteny Explorer: An Interactive Visualization Application for Teaching Genome Evolution

Chris Bryan, Gregory Guterman, Kwan-Liu Ma; Harris Lewin, Denis Larkin, Jaebum Kim, Jian Ma, Marta Farre

IEEE Transactions on Visualization and Computer Graphics
(SciVis 2016)
October, 2016

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Rapid advances in biology demand new tools for more active research dissemination and engaged teaching. This paper presents Synteny Explorer, an interactive visualization application designed to let college students explore genome evolution of mammalian species. The tool visualizes synteny blocks: segments of homologous DNA shared between various extant species that can be traced back or reconstructed in extinct, ancestral species. We take a karyogram-based approach to create an interactive synteny visualization, leading to a more appealing and engaging design for undergraduate-level genome evolution education ...


A Study On Designing Effective Introductory Materials for Information Visualization

Yuzuru Tanahashi, Nick Leaf, and Kwan-Liu Ma

Computer Graphics Forum
Volume 35, Number 7, October, 2016, pp. 117-126

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Designing introductory materials is extremely important when developing new information visualization techniques. All users, regardless of their domain knowledge, first must learn how to interpret the visually encoded information in order to infer knowledge from visualizations. Yet, despite its significance, there has been little research on how to design effective introductory materials for information visualization. This paper presents a study on the design of online guides that educate new users on how to utilize information visualizations, particularly focusing on the employment of exercise questions in the guides ...


A Study of Layout, Rendering, and Interaction Methods for Immersive Graph Visualization

Oh-hyun Kwon, Chris Muelder, Kyungwon Lee, and Kwan-Liu Ma

IEEE Transactions on Visualization and Computer Graphics
Volume 22, Number 7, July, 2016, pp. 1802-1815

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Information visualization has traditionally limited itself to 2D representations, primarily due to the prevalence of 2D displays
and report formats. However, there has been a recent surge in popularity of consumer grade 3D displays and immersive head-mounted displays (HMDs). The ubiquity of such displays enables the possibility of immersive, stereoscopic visualization environments. While techniques that utilize such immersive environments have been explored extensively for spatial and scientific visualizations, contrastingly very little has been explored for information visualization. ...


Visual Analysis of Cloud Computing Performance Using Behavioral Lines

Chris Muelder, Biao Zhu, Wei Chen, Hongxin Zhang, and Kwan-Liu Ma

IEEE Transactions on Visualization and Computer Graphics
Volume 22, Number 6, June, 2016, pp. 1694-1704

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Cloud computing is an essential technology to Big Data analytics and services. A cloud computing system is often comprised of a large number of parallel computing and storage devices. Monitoring the usage and performance of such a system is important for efficient operations, maintenance, and security. Tracing every application on a large cloud system is untenable due to scale and privacy issues ...


Decoupled Shading for Real-time Heterogeneous Volume Illumination

Yubo Zhang and Kwan-Liu Ma

Computer Graphics Forum
(EuroVis 2016)
Volume 35, Number 3, June, 2016

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Existing real-time volume rendering techniques which support global illumination are limited in modeling distinct realistic appearances for classified volume data, which is a desired capability in many fields of study for illustration and education. Directly extending the emission-absorption volume integral with heterogeneous material shading becomes unaffordable for real-time applications because the high-frequency view-dependent global lighting needs to be evaluated per sample along the volume integral ...


Visualization Techniques for Studying Large-Scale Flow Fields from Fusion Simulations

Franz Sauer, Yubo Zhang, Weixing Wang, St├ęphane Ethier, and Kwan-Liu Ma

IEEE Computing in Science and Engineering
Volume 18, Number 2, March/April, 2016, pp. 68-77

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This article presents a joint study between computer scientists and fusion scientists in developing visual tools for studying patterns in flow fields from large-scale magnetic confinement fusion simulations. The authors visualize time-varying flow data by generating trajectory curves via massless particle advection and design a set of color functions, pathline filters, and projection methods specific to achieve fusion research objectives. These tools aid scientists in managing the visual complexity of large trajectory datasets and are crucial in locating and understanding subtle features of interest ...


Contact Trees: Network Visualization Beyond Nodes and Edges

Arnold Sallaberry, Yang-Chih Fu, Hwai-Chung Ho, and Kwan-Liu Ma

Volume 11, Number 1, January, 2016

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Node-Link diagrams make it possible to take a quick glance at how nodes (or actors) in a network are connected by edges (or ties). A conventional network diagram of a "contact tree" maps out a root and branches that represent the structure of nodes and edges, often without further specifying leaves or fruits that would have grown from small branches. By furnishing such a network structure with leaves and fruits, we reveal details about "contacts" in our ContactTrees upon which ties and relationships are constructed ...