Amen Zwa is an ordinary bloke. He was born and raised in Burma. He now lives in Washington, DC, with his wife and son. He enjoys playing jazz with his son. He works as a technology consultant, focusing on business development, technology law, and algorithm design. His degrees are in law, computer science, and electrical engineering. In his spare time, Amen Zwa writes about law, technology, music, and motorsport. Contact him via Twitter @AmenZwa. Address: @AmenZwa@mathstodon.xyz https://amenzwa.github.io amazon.com/author/amenzwa www.linkedin.com/in/amenzwa
This paper describes a minimally immersive threedimensional volumetric interactive information vi... more This paper describes a minimally immersive threedimensional volumetric interactive information visualization system for management and analysis of document corpora. The system, SFA, uses glyph-based volume rendering, enabling more complex data relationships and information attributes to be visualized than traditional 2D and surface-based visualization systems. Two-handed interaction using three-space magnetic trackers and stereoscopic viewing are combined to produce a minimally immersive interactive system that enhances the user's three-dimensional perception of the information space. This new system capitalizes on the human visual system's preattentive learning capabilities to quickly analyze the displayed information. We describe the usefulness of this system for the analysis and visualization of document similarity within a corpus of textual documents.
This paper describes a minimally immersive interactive system for visualization of multivariate v... more This paper describes a minimally immersive interactive system for visualization of multivariate volumetric data. The system, SFA, uses glyph-based volume rendering which does not suffer the initial costs of isosurface rendering or voxel-based volume rendering, while offering the capability of viewing the entire volume. Glyph rendering also allows the simultaneous display of multiple data values per volume location. Two-handed interaction using three-space magnetic trackers and stereoscopic viewing are combined to produce a minimally immersive volumetric visualization system that enhances the user's three-dimensional perception of the data. We describe the usefulness of this system for visualizing volumetric scalar and vector data. SFA allows the three-dimensional volumetric visualization, manipulation, navigation, and analysis of multivariate, time-varying volumetric data, increasing the quantity and clarity of the information conveyed from the visualization system. 1 INTRODUCT...
This paper describes a new technique for the multi-dimensional visualization of data through auto... more This paper describes a new technique for the multi-dimensional visualization of data through automatic procedural generation of glyph shapes based on mathematical functions. Our glyph-based Stereoscopic Field Analyzer (SFA) system allows the visualization of both regular and irregular grids of volumetric data. SFA uses a glyph's location, 3D size, color and opacity to encode up to 8 attributes of scalar data per glyph. We have extended SFA's capabilities to explore shape variation as a visualization attribute. We opted for a procedural approach, which allows flexibility, data abstraction, and freedom from specification of detailed shapes. Superquadrics are a natural choice to satisfy our goal of automatic and comprehensible mapping of data to shape. For our initial implementation we have chosen superellipses. We parameterize superquadrics to allow continuous control over the "roundness" or "pointiness" of the shape in the two major planes which intersec...
This paper describes a minimally immersive three-dimensional volumetric interactive information v... more This paper describes a minimally immersive three-dimensional volumetric interactive information visualization system for management and analysis of document corpora. Two-handed interaction using three-space magnetic trackers and stereoscopic viewing are combined with glyph-based rendering of the corpora contents to produce a minimally immersive interactive system that enhances the user's three-dimensional perception of the information space. The results compare two-dimensional and three-dimensional techniques for information visualization
This paper describes a minimally immersive volumetric interactive system for information visualiz... more This paper describes a minimally immersive volumetric interactive system for information visualization. The system, SFA, uses glyph-based volume rendering, enabling more information attributes to be visualized than traditional 2D and surface-based information visualization systems. Two-handed interaction and stereoscopic viewing combine to produce a minimally immersive interactive system that enhances the user's three-dimensional perception of the information space, capitalizing on the human visual system's pre-attentive learning capabilities to quickly analyze the displayed information. We describe the usefulness of this system for the visualization of document similarity within a corpus of textual documents. SFA allows the three-dimensional volumetric visualization, manipulation, navigation, and analysis of multivariate, time-varying information spaces, increasing the quantity and clarity of information conveyed from the visualization as compared to traditional 2D inform...
The n-gram analysis technique breaks up a text documentinto several n-character long unique grams... more The n-gram analysis technique breaks up a text documentinto several n-character long unique grams, and produces a vector whose components are the counts of these grams. Atypical corpus contains hundreds of thousands of such grams. Wavelet compression reduces the dimension of the n-gram vectors, and speeds up document query operations. Documentvectors with their dimensions reduced to four components is readily represented in a three dimensional volume.
Information visualization of multivariate data is a di cult task. Glyph-based rendering is an att... more Information visualization of multivariate data is a di cult task. Glyph-based rendering is an attempt to discretize the data visually so that individual visual elements of the nal display such as color, size, position, etc. encode some information about the data. We propose a new simple method for allowing the use of shape for quantitative, continuous data by generating glyph shape automatically using procedural techniques. This abstracts the burden of glyph design away from the user in a procedural fashion while still allowing the user a high level, directorial control over the shape design. We introduce the use of superquadric ellipsoid surfaces [1] for this task and discuss the perceptual validity of this type of shape for pre-attentive discrimination. Furthermore, we discuss the generalization of this technique to include many other traditional procedural methods from computer graphics. 1
This paper describes a minimally immersive three-dimensional volumetric interactive information v... more This paper describes a minimally immersive three-dimensional volumetric interactive information visualization system for management and analysis of document corpora. The system, SFA, uses glyph-based volume rendering, enabling more complex data relationships and information attributes to be visualized than traditional 2D and surface-based visualization systems. Two-handed interaction using three-space magnetic trackers and stereoscopic viewing are combined to produce a minimally immersive-interactive system that enhances the user's three-dimensional perception of the information space. This new system capitalizes on the human visual system's preattentive learning capabilities to quickly analyze the displayed information. We describe the usefulness of this system for the analysis and visualization of document similarity within a corpus of textual documents.
Information visualization of multivariate data is a di cult task. Glyph-based rendering is an att... more Information visualization of multivariate data is a di cult task. Glyph-based rendering is an attempt to discretize the data visually so that individual visual elements of the nal display such as color, size, position, etc. encode some information about the data. We propose a new simple method for allowing the use of shape for quantitative, continuous data by generating glyph shape automatically using procedural techniques. This abstracts the burden of glyph design away from the user in a procedural fashion while still allowing the user a high level, directorial control over the shape design. We introduce the use of superquadric ellipsoid surfaces [1] for this task and discuss the perceptual validity of this type of shape for pre-attentive discrimination. Furthermore, we discuss the generalization of this technique to include many other traditional procedural methods from computer graphics.
There is a myriad of methodologies to assess driving performance after a stroke. These include ps... more There is a myriad of methodologies to assess driving performance after a stroke. These include psychometric tests, driving simulation, questionnaires, and/or road tests. Research-based driving simulators have emerged as a safe, convenient way to assess driving performance after a stroke. Such traditional research simulators are useful in recreating street traffic scenarios, but are often expensive, with limited physics models and graphics rendering. In contrast, racing simulators developed for motorsport professionals and enthusiasts offer high levels of realism, run on consumer-grade hardware, and can provide rich telemetric data. However, most offer limited simulation of traffic scenarios. This pilot study compares the feasibility of research simulation and racing simulation in a sample with minor stroke. We determine that the racing simulator is tolerated well in subjects with a minor stroke. There were correlations between research and racing simulator outcomes with psychometric...
There is a myriad of methodologies to assess driving performance after a stroke. These include ps... more There is a myriad of methodologies to assess driving performance after a stroke. These include psychometric tests, driving simulation, questionnaires, and/or road tests. Research-based driving simulators have emerged as a safe, convenient way to assess driving performance after a stroke. Such traditional research simulators are useful in recreating street traffic scenarios, but are often expensive, with limited physics models and graphics rendering. In contrast, racing simulators developed for motorsport professionals and enthusiasts offer high levels of realism, run on consumer-grade hardware, and can provide rich telemetric data. However, most offer limited simulation of traffic scenarios. This pilot study compares the feasibility of research simulation and racing simulation in a sample with minor stroke. We determine that the racing simulator is tolerated well in subjects with a minor stroke. There were correlations between research and racing simulator outcomes with psychometric tests associated with driving performance, such as the Trails Making Test Part A, Snellgrove Maze Task, and the Motricity Index. We found correlations between measures of driving speed on a complex research simulator scenario and racing simulator lap time and maximum tires off track. Finally, we present two models, using outcomes from either the research or racing simulator, predicting road test failure as linked to a previously published fitness-to-drive calculator that uses psychometric screening.
This paper describes a minimally immersive threedimensional volumetric interactive information vi... more This paper describes a minimally immersive threedimensional volumetric interactive information visualization system for management and analysis of document corpora. The system, SFA, uses glyph-based volume rendering, enabling more complex data relationships and information attributes to be visualized than traditional 2D and surface-based visualization systems. Two-handed interaction using three-space magnetic trackers and stereoscopic viewing are combined to produce a minimally immersive interactive system that enhances the user's three-dimensional perception of the information space. This new system capitalizes on the human visual system's preattentive learning capabilities to quickly analyze the displayed information. We describe the usefulness of this system for the analysis and visualization of document similarity within a corpus of textual documents.
This paper describes a minimally immersive interactive system for visualization of multivariate v... more This paper describes a minimally immersive interactive system for visualization of multivariate volumetric data. The system, SFA, uses glyph-based volume rendering which does not suffer the initial costs of isosurface rendering or voxel-based volume rendering, while offering the capability of viewing the entire volume. Glyph rendering also allows the simultaneous display of multiple data values per volume location. Two-handed interaction using three-space magnetic trackers and stereoscopic viewing are combined to produce a minimally immersive volumetric visualization system that enhances the user's three-dimensional perception of the data. We describe the usefulness of this system for visualizing volumetric scalar and vector data. SFA allows the three-dimensional volumetric visualization, manipulation, navigation, and analysis of multivariate, time-varying volumetric data, increasing the quantity and clarity of the information conveyed from the visualization system. 1 INTRODUCT...
This paper describes a new technique for the multi-dimensional visualization of data through auto... more This paper describes a new technique for the multi-dimensional visualization of data through automatic procedural generation of glyph shapes based on mathematical functions. Our glyph-based Stereoscopic Field Analyzer (SFA) system allows the visualization of both regular and irregular grids of volumetric data. SFA uses a glyph's location, 3D size, color and opacity to encode up to 8 attributes of scalar data per glyph. We have extended SFA's capabilities to explore shape variation as a visualization attribute. We opted for a procedural approach, which allows flexibility, data abstraction, and freedom from specification of detailed shapes. Superquadrics are a natural choice to satisfy our goal of automatic and comprehensible mapping of data to shape. For our initial implementation we have chosen superellipses. We parameterize superquadrics to allow continuous control over the "roundness" or "pointiness" of the shape in the two major planes which intersec...
This paper describes a minimally immersive three-dimensional volumetric interactive information v... more This paper describes a minimally immersive three-dimensional volumetric interactive information visualization system for management and analysis of document corpora. Two-handed interaction using three-space magnetic trackers and stereoscopic viewing are combined with glyph-based rendering of the corpora contents to produce a minimally immersive interactive system that enhances the user's three-dimensional perception of the information space. The results compare two-dimensional and three-dimensional techniques for information visualization
This paper describes a minimally immersive volumetric interactive system for information visualiz... more This paper describes a minimally immersive volumetric interactive system for information visualization. The system, SFA, uses glyph-based volume rendering, enabling more information attributes to be visualized than traditional 2D and surface-based information visualization systems. Two-handed interaction and stereoscopic viewing combine to produce a minimally immersive interactive system that enhances the user's three-dimensional perception of the information space, capitalizing on the human visual system's pre-attentive learning capabilities to quickly analyze the displayed information. We describe the usefulness of this system for the visualization of document similarity within a corpus of textual documents. SFA allows the three-dimensional volumetric visualization, manipulation, navigation, and analysis of multivariate, time-varying information spaces, increasing the quantity and clarity of information conveyed from the visualization as compared to traditional 2D inform...
The n-gram analysis technique breaks up a text documentinto several n-character long unique grams... more The n-gram analysis technique breaks up a text documentinto several n-character long unique grams, and produces a vector whose components are the counts of these grams. Atypical corpus contains hundreds of thousands of such grams. Wavelet compression reduces the dimension of the n-gram vectors, and speeds up document query operations. Documentvectors with their dimensions reduced to four components is readily represented in a three dimensional volume.
Information visualization of multivariate data is a di cult task. Glyph-based rendering is an att... more Information visualization of multivariate data is a di cult task. Glyph-based rendering is an attempt to discretize the data visually so that individual visual elements of the nal display such as color, size, position, etc. encode some information about the data. We propose a new simple method for allowing the use of shape for quantitative, continuous data by generating glyph shape automatically using procedural techniques. This abstracts the burden of glyph design away from the user in a procedural fashion while still allowing the user a high level, directorial control over the shape design. We introduce the use of superquadric ellipsoid surfaces [1] for this task and discuss the perceptual validity of this type of shape for pre-attentive discrimination. Furthermore, we discuss the generalization of this technique to include many other traditional procedural methods from computer graphics. 1
This paper describes a minimally immersive three-dimensional volumetric interactive information v... more This paper describes a minimally immersive three-dimensional volumetric interactive information visualization system for management and analysis of document corpora. The system, SFA, uses glyph-based volume rendering, enabling more complex data relationships and information attributes to be visualized than traditional 2D and surface-based visualization systems. Two-handed interaction using three-space magnetic trackers and stereoscopic viewing are combined to produce a minimally immersive-interactive system that enhances the user's three-dimensional perception of the information space. This new system capitalizes on the human visual system's preattentive learning capabilities to quickly analyze the displayed information. We describe the usefulness of this system for the analysis and visualization of document similarity within a corpus of textual documents.
Information visualization of multivariate data is a di cult task. Glyph-based rendering is an att... more Information visualization of multivariate data is a di cult task. Glyph-based rendering is an attempt to discretize the data visually so that individual visual elements of the nal display such as color, size, position, etc. encode some information about the data. We propose a new simple method for allowing the use of shape for quantitative, continuous data by generating glyph shape automatically using procedural techniques. This abstracts the burden of glyph design away from the user in a procedural fashion while still allowing the user a high level, directorial control over the shape design. We introduce the use of superquadric ellipsoid surfaces [1] for this task and discuss the perceptual validity of this type of shape for pre-attentive discrimination. Furthermore, we discuss the generalization of this technique to include many other traditional procedural methods from computer graphics.
There is a myriad of methodologies to assess driving performance after a stroke. These include ps... more There is a myriad of methodologies to assess driving performance after a stroke. These include psychometric tests, driving simulation, questionnaires, and/or road tests. Research-based driving simulators have emerged as a safe, convenient way to assess driving performance after a stroke. Such traditional research simulators are useful in recreating street traffic scenarios, but are often expensive, with limited physics models and graphics rendering. In contrast, racing simulators developed for motorsport professionals and enthusiasts offer high levels of realism, run on consumer-grade hardware, and can provide rich telemetric data. However, most offer limited simulation of traffic scenarios. This pilot study compares the feasibility of research simulation and racing simulation in a sample with minor stroke. We determine that the racing simulator is tolerated well in subjects with a minor stroke. There were correlations between research and racing simulator outcomes with psychometric...
There is a myriad of methodologies to assess driving performance after a stroke. These include ps... more There is a myriad of methodologies to assess driving performance after a stroke. These include psychometric tests, driving simulation, questionnaires, and/or road tests. Research-based driving simulators have emerged as a safe, convenient way to assess driving performance after a stroke. Such traditional research simulators are useful in recreating street traffic scenarios, but are often expensive, with limited physics models and graphics rendering. In contrast, racing simulators developed for motorsport professionals and enthusiasts offer high levels of realism, run on consumer-grade hardware, and can provide rich telemetric data. However, most offer limited simulation of traffic scenarios. This pilot study compares the feasibility of research simulation and racing simulation in a sample with minor stroke. We determine that the racing simulator is tolerated well in subjects with a minor stroke. There were correlations between research and racing simulator outcomes with psychometric tests associated with driving performance, such as the Trails Making Test Part A, Snellgrove Maze Task, and the Motricity Index. We found correlations between measures of driving speed on a complex research simulator scenario and racing simulator lap time and maximum tires off track. Finally, we present two models, using outcomes from either the research or racing simulator, predicting road test failure as linked to a previously published fitness-to-drive calculator that uses psychometric screening.
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