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Physical Sciences and Mathematics Commons™
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Articles 1 - 7 of 7
Full-Text Articles in Physical Sciences and Mathematics
Using Data Visualization Software To Aid In The Analysis Of Geographical Data, Matthew R. Evers, Inzamam Rahaman
Using Data Visualization Software To Aid In The Analysis Of Geographical Data, Matthew R. Evers, Inzamam Rahaman
STAR Program Research Presentations
NASA Web World Wind (Web WW) is designed to visualize and manage geographical data. As a first implementation of visualization and analysis, we designed an application to map earthquake data onto the globe. Portions of this code were merged with application monitoring magnetic field anomalies possibly associated with earthquake precursor activity. Web WW enabled the visualization of the directional vectors from this data to point to the source location of the earthquake. We also developed a prototype urban management application which utilizes OpenStreetMaps to provide simple features such as route navigation, geographical and services information in an area of interest. …
Mapping Open Water Bodeis With Optical Remote Sensing, Mary Ellen O'Donnell, Erika Podest
Mapping Open Water Bodeis With Optical Remote Sensing, Mary Ellen O'Donnell, Erika Podest
STAR Program Research Presentations
There is interest in mapping open water bodies using remote sensing data. Coverage and persistence of open water is currently a poorly measured variable due to its spatial and temporal variability across landscapes, especially in remote areas. The presence and persistence of open water is one of the primary indicators of conditions suitable for mosquito breeding habitats. Predicting the risk of mosquito caused disease outbreaks is a required step towards their control and eradication. Satellite observations can provide needed data to support agency decisions for deployment of preventative measures and control resources. This study, which will try to map open …
An Interactive User Interface Improves Data Visualization In R, Nathan Sweem
An Interactive User Interface Improves Data Visualization In R, Nathan Sweem
STAR Program Research Presentations
An interactive user interface application was created using the R statistical computing environment and the Shiny package to visualize historical data on the performance of mutual funds and exchange-traded funds (ETFs). Historical data for these funds is scraped from the Yahoo! Finance webpage. The application allows the user to analyze this historical data by category and fund family, which are also scraped from Yahoo! Finance. The application generates interactive plots to compare the performance of selected mutual funds and ETFs given the baseline and center determined by the user. The application has been modified to attentively match the data with …
Enhanced Presentation Of Tomographic Data, Carmen Watts Clayton, Bernice Mills, George Beffleben, Thien Vu-Nguyen
Enhanced Presentation Of Tomographic Data, Carmen Watts Clayton, Bernice Mills, George Beffleben, Thien Vu-Nguyen
STAR Program Research Presentations
X-ray tomography yields a very large amount of data in three dimensions. Effectively displaying this data to a broad audience is a challenge. Techniques are discussed to improve presentation of movies of both 2D and 3D tomographic data using commercially available softwares.
Building Conflict-Free Fft Schedules, Stephen Richardson, Dejan Markovic, Andrew Danowitz, John Brunhaver, Mark Horowitz
Building Conflict-Free Fft Schedules, Stephen Richardson, Dejan Markovic, Andrew Danowitz, John Brunhaver, Mark Horowitz
Computer Science and Software Engineering
A conflict-free schedule lets an FFT run to completion without ever having to pause for memory-conflict resolution. We show how to build such schedules for FFTs having any number of butterfly units B operating at any radix R, transforming any number of datapoints D. Our algorithm works for FFT datapaths with or without pipeline overlap, and for memory banks having any number of access ports. Specifically, it enables construction of conflict-free schedules using single-ported memory banks, which require less area than more traditional multi-ported designs.
Measuring The Strength Of The Semantic Relationship Between Words, Lubomir Stanchev
Measuring The Strength Of The Semantic Relationship Between Words, Lubomir Stanchev
Computer Science and Software Engineering
We propose a novel way for extracting the strength of the semantic relationship between words from semi-structured sources, such as WordNet. Unlike existing approaches that only explore the structured information (e.g., the hypernym relationship in WordNet), we present a framework that allows us to utilize all available information, including natural text descriptions. Our approach constructs a similarity graph that stores the strength of the semantic relationship between words. Specifically, an edge between two words describes the probability that someone who is interested in resources about the first word will be also interested in resources about the second word. Note that …
Semantic Search Using A Similarity Graph, Lubomir Stanchev
Semantic Search Using A Similarity Graph, Lubomir Stanchev
Computer Science and Software Engineering
Given a set of documents and an input query that is expressed in a natural language, the problem of document search is retrieving the most relevant documents. Unlike most existing systems that perform document search based on keywords matching, we propose a search method that considers the meaning of the words in the query and the document. As a result, our algorithm can return documents that have no words in common with the input query as long as the documents are relevant. For example, a document that contains the words “Ford”, “Chrysler” and “General Motors” multiple times is surely relevant …