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Information Visualisation (IV), 2012 16th International Conference on

Date 11-13 July 2012

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Displaying Results 1 - 25 of 119
  • [Cover art]

    Page(s): C4
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  • [Title page i]

    Page(s): i
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  • [Title page iii]

    Page(s): iii
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  • [Copyright notice]

    Page(s): iv
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  • Table of contents

    Page(s): v - xiii
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  • Preface

    Page(s): xiv
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  • Program Committee

    Page(s): xix
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  • Reviewers

    Page(s): xx
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  • Keynote lectures

    Page(s): xxi - xxiv
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (208 KB)  

    These keynote lectures discuss the following: Nearly a Theory of Visualization; Visual Investigation: Exposing New Patterns for Fighting Crime; A Case-Study in Information Visualization Design; New Grand Challenges in Information Visualization; Embodied Cultural Archives: Imagining New Heritage. View full abstract»

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  • D-Art Gallery 2012

    Page(s): xxv - xxvii
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  • Sphere-based Information Visualization: Challenges and Benefits

    Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (525 KB) |  | HTML iconHTML  

    Use of a sphere as a basis for organizing an information visualization should balance issues such as occlusion against potential useful benefits such as natural navigational affordances and perceptual connotations of an application. View full abstract»

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  • Edge Equalized Treemaps

    Page(s): 7 - 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (286 KB) |  | HTML iconHTML  

    Treemap is a visualization method for hierarchical structures in which nodes are drawn as rectangles and arranged in a nested style. Several variations of Treemap have been developed to represent different types of data. In this paper, we propose an Edge Equalized Treemap, a representation that embeds visual data such as a bar chart in leaf rectangles. This representation is characterized by leaf rectangles of equal widths. Because their widths are equal, the scale intervals of charts in a leaf rectangle can be unified, meaning that we can compare charts simply by looking at them. We compare the Edge Equalized Treemap with existing layout methods, and demonstrate the usefulness of our approach. View full abstract»

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  • Three-level Visualization of Internet Discussion with Extruded Word Clouds

    Page(s): 13 - 17
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (670 KB) |  | HTML iconHTML  

    Visualization of discussions is an intensively explored information visualization area. Many existing approaches explore the discussions from the point of view of individual participants, often omitting interesting information about the discussion itself. We present a visualization technique that centers around the discussion, its dynamics, intensity and topic changes. The flow of the text is divided into uniform time spans that aggregate the data and where the text analyzer runs. Then, the discussion is visualized using three different levels of details. The topmost shows the global view of the discussion development over time, the middle shows an inside view on discussions' main topics, and the bottom level displays individual word clouds. The technique is demonstrated on data from an Internet Relay Chat (IRC) but it can be used for visual analysis of any time-dependent text data such as email communication, search terms, keywords and similar. View full abstract»

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  • Fast Layout Computation of Hierarchically Clustered Networks: Algorithmic Advances and Experimental Analysis

    Page(s): 18 - 23
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (670 KB) |  | HTML iconHTML  

    Fast computation of two-dimensional layouts of hierarchically clustered networks is a well-studied problem in graph visualization. We present algorithmic and experimental advances on the subject: (i) We propose a new drawing algorithm that combines space-filling and fast force-directed methods; it runs in O(nlogn+m) time, where n and m are the number of vertices and edges of the network, respectively. This running time does not depend on the number of clusters, thus the algorithm guarantees good time performances independently of the structure of the cluster hierarchy. As a further advantage, the algorithm can be easily parallelized. (ii) We present an experimental analysis aimed at understanding which clustering algorithms can be used, in combination with our visualization technique, to generate better quality drawings for medium and large networks with small-world and scale-free structure. As far as we know, no previous similar experiments have been done in this respect. View full abstract»

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  • Implementation and Evaluation of an Enhanced H-tree Layout Pedigree Visualization

    Page(s): 24 - 29
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (442 KB) |  | HTML iconHTML  

    The constant growth of available genealogical information has encouraged the research of visualization techniques capable of representing the corresponding large amount of data. An H-Tree Layout has been recently proposed to represent pedigree data as a way to overcome some of the limitations of traditional representations. However, this new method has its own limitations which may hinder its adoption. In this paper, we propose some enhancements to the H-Tree Layout pedigree visualization method in order to overcome some of the identified limitations. An implementation of the proposed enhancements and results of a preliminary evaluation are also provided. View full abstract»

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  • Animation for Time-oriented Data: An Overview of Empirical Research

    Page(s): 30 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (117 KB) |  | HTML iconHTML  

    The usage of visualizations to aid the analysis of time oriented data plays an important role in various fields of applications. The need to visualize such data was decisive for the development of different visualization techniques over the last years. One of the frequently applied techniques is animation in order to illustrate the movements in such a way to make changes in the data transparent. However, evaluation studies of such animated interfaces for time-oriented data with potential users are still difficult to find. In this paper, we present our observations based on a systematic literature review with the motivation to support researchers and designers to identify future directions for their research. The literature review is split in two parts: (1) research on animation from the field of psychology, and (2) evaluation studies with the focus on animation of time-oriented data. View full abstract»

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  • Lowering Visual Clutter in Large Component Diagrams

    Page(s): 36 - 41
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (961 KB) |  | HTML iconHTML  

    Nowadays component applications can easily consist of hundreds or thousands of components and it is thus difficult to understand their structure. Diagram visualisation does not help much because of visual clutter caused by big amount of elements and connections, especially in the case of flat component models. This paper describes a novel approach of removing a large part of connections from the diagram while preserving the information about component interconnections. It uses a separated components area to show the components with big amount of connections. For each component in this area, clustered interfaces are shown instead of all interfaces, with the ability to show details on demand. The main idea of this technique can be used in a similar way to reduce the clutter in node-link graphs. To show the effect of this technique we discuss example lines reductions for several component applications. View full abstract»

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  • Visualizing Migration of Demographic Simulation in Prehistoric and Protohistoric Periods

    Page(s): 42 - 47
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (852 KB) |  | HTML iconHTML  

    In this paper, we report two methods to visualize migration of people in an artificial society. The artificial society system we target have been developed for simulating demographic changes in prehistoric and protohistoric periods in Japan. The system is capable of long term simulation of demographic changes in and migration between areas. We visualize migration from two perspectives: global view and family view. Global view focuses on the flow of people in migration. Family view focuses family relations in migration and visualizes it with a graph. View full abstract»

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  • Visualizing Patterns in Node-link Diagrams

    Page(s): 48 - 53
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1459 KB) |  | HTML iconHTML  

    Pattern discovery plays an important part in the graph analysis process. Good examples are the detection of communities in social networks or the clustering into pathways of metabolic networks. However, elements may be shared by several clusters, making the patterns entangled. When mining such data, experts are usually interested in both each individual cluster and their overlaps. Dedicated visualization methods are therefore necessary to efficiently support their exploration process. In this article, we propose a new method that emphasizes patterns in a node-link diagram representation and allows to easily identify overlaps between these patterns as well. Our technique combines graph topology and embedding to compute concave hulls with holes surrounding the patterns of interest. View full abstract»

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  • AIVA vs UML: Comparison of Component Application Visualizations in a Case-study

    Page(s): 54 - 61
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (980 KB) |  | HTML iconHTML  

    UML is the state of the art in visualization of software. However, it does not satisfy the needs of modeling in the domain of component applications and complex software architectures. UML has to be extended with profiles so as to be able to model the specifics of a particular component model; its diagrams are not scalable, therefore one has to balance the amount of information and readability; and it presents all the information at once so visual data mining is harder. These were the reasons for developing a completely new approach called AIVA (Advanced Interactive Visualization Approach) that focuses solely on the component domain and addresses the problems of scalability and readability by adopting interactive techniques like information hiding and details on demand. In this paper we analyse how this new approach stands compared with UML by modelling a nontrivial component application. View full abstract»

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  • Visual Color Design

    Page(s): 62 - 67
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (425 KB) |  | HTML iconHTML  

    Many efforts from both artists and scientists on color design have resulted in a variety of models and rules devoted to coloring graphics. Based on these results, a lot of interactive tools are now available to help with color design based on various sorts of color themes, templates, palettes, swatches, brushes, etc. However, despite the numbers of tools and results available, in many situations, color design is still tedious and time consuming for both amateurs and professionals. In this paper, we introduce visual color design as a new approach to handling coloring problems interactively. The coloring of web documents is used to illustrate our approach with a real case study. The case study takes as input (1) a given color image and (2) an HTML/CSS document to be colored. View full abstract»

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  • A Vertical Timeline Visualization for the Exploratory Analysis of Dialogue Data

    Page(s): 68 - 73
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (361 KB) |  | HTML iconHTML  

    This paper presents a novel vertical timeline information-visualization technique developed to support the analysis of human-computer dialogue data. The technique uses combined linked views including distorted views to effectively communicate the timing of dialogue events while presenting text in such a manner that it is easily readable. A prototype has been implemented and tested to demonstrate the technique's effectiveness for supporting exploration and revealing previously unsuspected patterns. View full abstract»

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  • Angular Treemaps - A New Technique for Visualizing and Emphasizing Hierarchical Structures

    Page(s): 74 - 80
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (409 KB) |  | HTML iconHTML  

    Space-filling visualization techniques have proved their capability in visualizing large hierarchical structured data. However, most existing techniques restrict their partitioning process in vertical and horizontal direction only, which cause problem with identifying hierarchical structures. This paper presents a new space-filling method named Angular Treemaps that relax the constraint of the rectangular subdivision. The approach of Angular Treemaps utilizes divide and conquer paradigm to visualize and emphasize large hierarchical structures within a compact and limited display area with better interpretability. Angular Treemaps generate various layouts to highlight hierarchical sub-structure based on user's preferences or system recommendations. It offers flexibility to be adopted into a wider range of applications, regarding different enclosing shapes. Preliminary usability results suggest user's performance by using this technique is improved in locating and identifying categorized analysis tasks. View full abstract»

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  • Integrated Visualization of Gene Network and Ontology Applying a Hierarchical Graph Visualization Technique

    Page(s): 81 - 86
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (378 KB) |  | HTML iconHTML  

    A gene network is constructed with genes as nodes, and interactions between genes as edges so as to reveal unknown gene functions and relationship. However, nodes and edges of gene networks are usually very numerous. Because of that, it may be difficult to understand relations between genomic functions and gene-gene interactions, if it is visualized by traditional techniques. This paper presents our technique on visualization of gene networks and gene ontology(GO), which summarizes gene functions and attributes. The technique represents the functions defined by GO as colors of nodes, and bundles edges depending on the gene functions to ease visual complication of the network. View full abstract»

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  • Visualizing the Evolution of Software Systems Using the Forest Metaphor

    Page(s): 87 - 92
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1416 KB) |  | HTML iconHTML  

    We present an approach based on a forest metaphor to ease the comprehension of evolving object oriented software systems. The approach takes advantages of familiar concepts such as forests of trees, sub-forest of trees, trunks, branches, leaves, and color of the leaves. In particular, each release of a software is represented as a forest that users (or software maintainers) can navigate and interact with. Users can pass from a release to another one, so understanding how the entire software and its classes evolve throughout the past releases. The approach has been implemented in a prototype of a 3D interactive environment. A preliminary empirical evaluation has been also conducted to assess that environment and the underlying approach. View full abstract»

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