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In analytical chemistry, we often perform repetitive measurements to detect and minimize inaccuracies caused by both determinate and indeterminate errors. Despite the cares we take, the presence of random errors means that repeated measurements almost never have exactly the same magnitude. The collective difference between these measurements - observed values - and the estimated or expected value is called uncertainty. Uncertainty is conventionally written after the estimated or expected value.
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Probability Histograms
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An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
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Signal Flow Graphs
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Signal-flow graphs offer a streamlined and intuitive approach to representing control systems, providing an alternative to traditional block diagrams. These graphs use branches to symbolize systems and nodes to represent signals, effectively illustrating the relationships and interactions within the system.
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Using Three-color Single-molecule FRET to Study the Correlation of Protein Interactions
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Uncertainty Visualization of 2D Morse Complex Ensembles Using Statistical Summary Maps.
IEEE Transactions on Visualization and Computer Graphics
|September 8, 2020
Summary
Uncertainty in scalar fields complicates understanding Morse complexes. This study introduces statistical summary maps to visualize variations and positional uncertainties in 2D Morse complexes from uncertain data.
Area of Science:
- Topological Data Analysis
- Scientific Visualization
- Uncertainty Quantification
Background:
- Morse complexes are crucial for understanding scalar field topology in scientific visualization.
- Data uncertainty inherent in scalar fields limits the structural interpretation of Morse complexes.
- Existing methods struggle to represent the impact of data uncertainty on topological structures.
Purpose of the Study:
- To develop methods for visualizing uncertainty in ensembles of 2D Morse complexes derived from uncertain scalar fields.
- To introduce novel statistical summary maps for quantifying structural variations and positional uncertainties.
- To enhance the understanding of Morse complexes as structural abstractions in the presence of data uncertainty.
Main Methods:
- Generating ensembles of 2D Morse complexes from uncertain scalar fields.
- Developing three types of statistical summary maps: probabilistic, significance, and survival maps.
- Applying these maps to quantify structural variations and positional uncertainties of Morse complex features.
Main Results:
- Demonstrated the ability of statistical summary maps to characterize uncertain behaviors of gradient flows.
- Quantified structural variations and positional uncertainties of Morse complexes in ensembles.
- Provided new visual entities for understanding topological structures under data uncertainty.
Conclusions:
- The proposed statistical summary maps effectively visualize uncertainty in 2D Morse complexes.
- This approach enhances the interpretability of topological structures in scalar fields with inherent data uncertainty.
- The methods are validated on diverse simulation datasets including wind, flow, and ocean eddy.

