30-Issue 3

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https://diglib.eg.org/handle/10.2312/163

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Browsing 30-Issue 3 by Subject "Computer Graphics"

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    A Gradient-Based Comparison Measure for Visual analysis of Multifield Data
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Nagaraj, Suthambhara; Natarajan, Vijay; Nanjundiah, Ravi S.; H. Hauser, H. Pfister, and J. J. van Wijk
    We introduce a multifield comparison measure for scalar fields that helps in studying relations between them. The comparison measure is insensitive to noise in the scalar fields and to noise in their gradients. Further, it can be computed robustly and efficiently. Results from the visual analysis of various data sets from climate science and combustion applications demonstrate the effective use of the measure.
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    Interactive Visual Analysis of Temporal Cluster Structures
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Turkay, Cagatay; Parulek, J.; Reuter, N.; Hauser, Helwig; H. Hauser, H. Pfister, and J. J. van Wijk
    Cluster analysis is a useful method which reveals underlying structures and relations of items after grouping them into clusters. In the case of temporal data, clusters are defined over time intervals where they usually exhibit structural changes. Conventional cluster analysis does not provide sufficient methods to analyze these structural changes, which are, however, crucial in the interpretation and evaluation of temporal clusters. In this paper, we present two novel and interactive visualization techniques that enable users to explore and interpret the structural changes of temporal clusters. We introduce the temporal cluster view, which visualizes the structural quality of a number of temporal clusters, and temporal signatures, which represents the structure of clusters over time. We discuss how these views are utilized to understand the temporal evolution of clusters. We evaluate the proposed techniques in the cluster analysis of mixed lipid bilayers.
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    Topology-based Visualization of Transformation Pathways in Complex Chemical Systems
    (The Eurographics Association and Blackwell Publishing Ltd., 2011) Beketayev, Kenes; Weber, G. H.; Haranczyk, M.; Bremer, P.-T.; Hlawitschka, M.; Hamann, B.; H. Hauser, H. Pfister, and J. J. van Wijk
    Studying transformation in a chemical system by considering its energy as a function of coordinates of the system's components provides insight and changes our understanding of this process. Currently, a lack of effective visualization techniques for high-dimensional energy functions limits chemists to plot energy with respect to one or two coordinates at a time. In some complex systems, developing a comprehensive understanding requires new visualization techniques that show relationships between all coordinates at the same time. We propose a new visualization technique that combines concepts from topological analysis, multi-dimensional scaling, and graph layout to enable the analysis of energy functions for a wide range of molecular structures. We demonstrate our technique by studying the energy function of a dimer of formic and acetic acids and a LTA zeolite structure, in which we consider diffusion of methane.