Scientists are generating ever-growing scale of
data with supercomputers in this big data era.
Visualization has been increasingly important for
analyzing, understanding, and revealing insights in data.
Our research interests generally involve in scalable visualization
and analysis of large scientific data.
可扩展性
In the context of our studies, the "scalability" is not limited
to its narrow implications, but also the follows:
Software scalability.
We largely employ and develop parallel and scalable methods
to visualize and analyze data on cutting-edge HPC platforms.
Feature scalability.
We meet the challenge of the new data and needs in scientific research,
e.g. increading number of variables and ensemble constituents,
coupled analysis of scalar and vector attributes, etc.
Human scalability.
We conduct user-centric research to help domain experts to
explore and investigate their data with novel user interaction techniques.
研究范围
Our research focus on multivariate, multi-valued, and ensemble flow data,
which consists of both scalar and vector attributes in the context of our studies.
Alternative to traditional flow visualization methods
which have been studied for decades,
we emphasize on the scalable analysis of indirect and multi-faceted features.
We also extensively use both Eulerian and Lagrangian method
for the flow data analysis from multiple perspectives.
标量场的多变量分析
Multivariate Analysis of Scalar Fields
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or download here.
Hanqi Guo, He Xiao, and Xiaoru Yuan
Scalable Multivariate Volume Visualization and Analysis based on Dimension Projection and Parallel Coordinates.
IEEE Transactions on Visualization and Computer Graphics, 18(9):1397-1410, 2012.
| DOI | PDF (861 KB) |
Hanqi Guo, He Xiao, and Xiaoru Yuan
Multi-Dimensional Transfer Function Design based on Flexible Dimension Projection Embedded in Parallel Coordinates.
In Proceedings of IEEE Pacific Visualization Symposium (PacificVis 2011), pages 19-26, Hong Kong, Mar 1-4, 2011.
| DOI | PDF (1.2 MB) | MPEG4 (5.0 MB) |
Xiaoru Yuan, He Xiao, Hanqi Guo, Peihong Guo, Wesley Kendall, Jian Huang, and Yongxian Zhang
Scalable Multi-variate Analytics of Seismic and Satellite-based Observational Data.
IEEE Transactions on Visualization and Computer Graphics, 16(3):1413-1420, 2010.
| DOI | PDF (3.3 MB) |
流场的多变量分析
Multivariate Analysis of Flow Fields
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or download here.
Qingya Shu, Hanqi Guo, Jie Liang, Limei Che, Junfeng Liu, and Xiaoru Yuan
EnsembleGraph: Interactive Visual Analysis of Spatiotemporal Behaviors in Ensemble Simulation Data.
In Proceedings of IEEE Pacific Visualization Symposium (PacificVis 2016), pages 56-63, Taipei, Apr. 19-22, 2016.
| DOI
| PDF (4.5 MB)
| WMV (24.6 MB) |
集合流场分析
Ensemble Flow Field Analysis
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or download here.
如果集合模拟数据涉及到矢量场,可以在矢量场中先进行迹线追踪,得到迹线之后,就可以计算迹线之前的差异,
以及计算迹线上每个高维变量之间的差异信息。我们进而关注集合模拟中的矢量场,将集合模拟数据作为一个整体来研究流场的特性,
提出了一种新的框架和原型系统,称为eFLAA (ensemble Flow Line Advection and Analysis)。
eFLAA计算集合模拟数据的差异场,该场可以用于分析和提取差异特征,加速进一步分析的过程等。
eFLAA可以同步地对所有集合模拟成员计算海量的场线并据此利用基于拉格朗日的距离度量计算成员的差异。
此外,因海量场线的数据规模巨大,我们改进了作业调度机制,使其能够在有限的内存下运行,平衡吞吐率和负载均衡之间的关系。
我们在山东济南超算中心进行了测试,取得了很好的可扩展性。
Hanqi Guo, Xiaoru Yuan, Jian Huang, and Xiaomin Zhu
Coupled Ensemble Flow Line Advection and Analysis.
IEEE Transactions on Visualization and Computer Graphics, 19(12):2733-2742, 2013.
| DOI | PDF (3.0MB)
| MPEG4 (5.0MB) |
为了更好地度量集合模拟数据矢量场之间的距离,我们进一步提出了一种基于最长公共子序列的度量方法。
具体而言,我们首先采用eFLAA的并行计算框架对迹线进行追踪。其次,使用最长公共子序列对相同地理位置出发的来
自不同集合模拟成员的迹线进行距离度量,然后对计算得到的距离进行可视化以及评估。
此外,在度量距离的同时,我们的方法允许把所有序列保存下来,以备以后计算时复用。
该方法与现有的两类方法,即点对点方法(point-wise)和动态规整算法DTW(Dynamic Time Warping)相比,
对异常值、数据缺失、迹线的采样率更鲁棒;而且还可以很好地解决集合成员迹线不等长带来的问题。
Richen Liu, Hanqi Guo, Jiang Zhang, and Xiaoru Yuan
Comparative Visualization of Vector Field Ensembles Based on Longest Common Subsequence.
In Proceedings of IEEE Pacific Visualization Symposium (PacificVis 2016), , pages 96-103, Taipei, Apr. 19-22, 2016.
| DOI | PDF (5.5 MB)
| Project Page |
Richen Liu, Hanqi Guo, and Xiaoru Yuan
User-defined feature comparison for vector field ensembles.
Journal of Visualization, 20(2):217–229, 2017.
| DOI
| PDF (4.9 MB)
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Hanqi Guo, Jiang Zhang, Richen Liu, Lu Liu, Xiaoru Yuan, Jian Huang, Xiangfei Meng, and Jingshan Pan.
Advection-based Sparse Data Management for Visualizing Unsteady Flow.
IEEE Transactions on Visualization and Computer Graphics (SciVis'14), 20(12):2555-2564, 2014.
| DOI
| PDF (4.8 MB) |
Jiang Zhang, Hanqi Guo, and Xiaoru Yuan.
Efficient Unsteady Flow Visualization with High-Order Access Dependencies.
In Proceedings of IEEE Pacific Visualization Symposium (PacificVis 2016), pages 80-87, Taipei, Apr. 19-22, 2016.
| DOI
| PDF (2.5 MB) |
Fan Hong, Chongke Bi, Hanqi Guo, Kenji Ono, and Xiaoru Yuan.
Compression-based Integral Curve Data Reuse Framework for Flow Visualization
Journal of Visualization, 2017.
| DOI
| PDF (0.5 MB) |
所见即所得体可视化
WYSIWYG VolViz
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or download here.
Hanqi Guo, Ningyu Mao, and Xiaoru Yuan
WYSIWYG (What You See is What You Get) Volume Visualization.
IEEE Transactions on Visualization and Computer Graphics, 17(12):2106-2114, 2011.
| DOI
| PDF (1.4 MB)
| MPEG4 (6.2 MB) |
Hanqi Guo, and Xiaoru Yuan
Local WYSIWYG Volume Visualization.
In Proceedings of IEEE Pacific Visualization Symposium (PacificVis 2013), pages 65-72, Sydney, NSW, Australia, Feb. 28-Mar.1, 2013.
| DOI | PDF (643 KB) | MPEG4 (8.2MB) |
Hanqi Guo, and Xiaoru Yuan
Design and Application of PKU Scientific Visualization System.
In Proceedings of National Annual Conference on High Performance Computing (HPC China 2013), pages 551-558, Guilin, China, Oct. 27-Oct. 31, 2013. (in Chinese), 2013.
| PDF (1.3 MB) |