Abstract: A test article containing test objects for assessing and evaluating an image producing x-ray computed tomography system, includes: an exterior shell assembly surrounding an inner volume; a base assembly comprising a flat base portion; a support structure comprising one or more partitions configured to support the test objects, a pair of component supports configured to support an angled bar test object, and one or more brackets configured to attach to at least one of: a partition and the flat base portion; an object length test object connected to the one or more partitions; an angled bar test object connected to the pair of component supports; an NEQ test object comprising a support extension with a threaded attachment configured to connect to a threaded attachment on another test object; and an acetal cylinder test object comprising two threaded mounting extensions and configured to support at least one metal annular device.

Abstract: Systems and methods obtain a database query, modify the database query into a modified database query incorporating a privacy mechanism configured for randomizing an attribute value of data in an answer to the modified database query, and output the modified database query. In some embodiments, the modified database query is forwarded to a database.

Abstract: A dosimeter assembly being placed within an inner volume of a test article for evaluating an image produced by an x-ray computed tomography (CT) system. The dosimeter assembly includes: a dosimeter having a display, a dosimeter shelf that supports the dosimeter; and an alignment bracket that positions the dosimeter on the dosimeter shelf. The dosimeter shelf is operable to be mounted within the x-ray computed tomography system test article, and the display of the dosimeter is viewable through a dosimeter window which is disposed at a front end of the x-ray computed tomography system test article, wherein the dosimeter assembly is accessible through an access panel directly beneath the dosimeter assembly, the access panel being an opening which is disposed on a base of the x-ray computer tomography system test article. The dosimeter is operably connected to a connection interface which is configured to exchange communication with an external device.

Abstract: Systems and methods obtain a database query, modify the database query into a modified database query incorporating a privacy mechanism configured for randomizing an attribute value of data in an answer to the modified database query, and output the modified database query. In some embodiments, the modified database query is forwarded to a database.

Abstract: Systems, methods, and manufactures for enhancing the determination of differential privacy query results. A computer implemented method for enhancing the determination of differential privacy query results is provided. The computer implemented method includes obtaining a first query of a database, determining a query result by executing the first query on the database, determining a noisy result by adding noise to the query result, wherein the noise is determined based on a first statistical evaluation of the first query, determining a first hash value identifying the first query based on one or more of the first statistical evaluation and a second statistical evaluation of the first query, maintaining the noisy result linked to the first hash value in a result cache, and returning the noisy result from the result cache in response to a subsequent query when a second hash value identifying the subsequent query is determined to be statistically similar to the first hash value.

Abstract: Systems, methods, and manufactures for enhancing the determination of differential privacy query results. Implementations may include a database; a result cache; a processor; and a media storing instructions that, when executed by the processor, cause the system to perform operations that include obtaining a query of the database; determining that a specificity of the query exceeds a specificity threshold; determining that the result cache lacks any query results of previous queries that are substantially equivalent to the query; partitioning the database into a plurality of groups; determining a query result by executing the query on the plurality of groups; determining a sensitivity of the query and a nominal measurement of the query; determining a noisy result by adding noise to the query result based on the sensitivity and the nominal measurement; storing the noisy result in the result cache; and providing the noisy result in response to the query.

Abstract: Systems, methods, and apparatuses are provided for evaluating an image quality of an image produced by an x-ray computed tomography (CT) system.

Abstract: Systems, methods, and apparatuses are provided for evaluating an image quality of an image produced by an x-ray computed tomography (CT) system. The system includes at least one test article configured to support one or more test objects within an inner volume. The test article includes an exterior shell assembly, a base assembly, a support structure.

Abstract: Apparatuses are provided for evaluating an image quality of an image produced by an x-ray computed tomography (CT) system.

Abstract: Systems, methods, and manufactures for enhancing the determination of differential privacy query results. Implementations may include a database; a result cache; a processor; and a media storing instructions that, when executed by the processor, cause the system to perform operations that include obtaining a query of the database; determining that a specificity of the query exceeds a specificity threshold; determining that the result cache lacks any query results of previous queries that are substantially equivalent to the query; partitioning the database into a plurality of groups; determining a query result by executing the query on the plurality of groups; determining a sensitivity of the query and a nominal measurement of the query; determining a noisy result by adding noise to the query result based on the sensitivity and the nominal measurement; storing the noisy result in the result cache; and providing the noisy result in response to the query.

Abstract: Systems, methods, and apparatuses are provided for evaluating an image quality of an image produced by an x-ray computed tomography (CT) system.

Abstract: Apparatuses are provided for evaluating an image quality of an image produced by an x-ray computed tomography (CT) system.

Abstract: A covariance-clustering algorithm for partitioning a graph into sub-graphs (clusters) using variations of the pseudo-inverse of the Laplacian matrix (A) associated with the graph. The algorithm does not require the number of clusters as an input parameter and, considering the covariance of the Markov field associated with the graph, algorithm finds sub-graphs characterized by a within-cluster covariance larger than an across-clusters covariance. The covariance-clustering algorithm is applied to a semantic graph representing the simulated evidence of multiple events.

Abstract: There is disclosed in the present application a traction device adapted to being mounted on a driving wheel tire of a vehicle for obtaining greater traction on ice or snow although the device may also be useful in certain types of mud. The device comprises four spring arms each including a textured traction portion positioned across the face of the tire tread. The device is quickly mounted over the tire by collapsing and spreading apart the tread portions to permit bringing the device into engagement with the tire from a radial direction. The four arms in two pairs are then disposed at right angles to each other and are thereafter simultaneously tightened into embracing generally equally spaced relationship with the tire by turning a spring loaded crank.