Results 161 to 170 of about 547,647 (206)
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Herschel Pointing Accuracy Improvement
SpaceOps 2012 Conference, 2012For the Herschel Space Observatory, launched on May 14, 2009, as part of the ESA Horizon 2000 Science Program, one critical aspect is the pointing accuracy as provided by the Attitude Control and Monitoring System (ACMS). After verification of the in-orbit performance of the ACMS during the Service Module Commissioning Phase, which revealed and ...
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Accuracy of point predictions in survival analysis
Statistics in Medicine, 2001AbstractSurvival time prediction is important in many applications, particularly for patients diagnosed with terminal diseases. A measure of prediction error taken from the medical literature is advocated as a practicable method of quantifying reliability of point predictions.
Henderson, Robin, Jones, M., Stare, J.
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Classification accuracy and cut point selection
Statistics in Medicine, 2012In biomedical research and practice, quantitative tests or biomarkers are often used for diagnostic or screening purposes, with a cut point established on the quantitative measurement to aid binary classification. This paper introduces an alternative to the traditional methods based on the Youden index and the closest‐to‐(0, 1) criterion for threshold ...
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Polychromatic Point Spread Function: Calculation Accuracy
Journal of Modern Optics, 1994Abstract The polychromatic point spread function is obtained by integrating the monochromatic intensities along the spectrum taking into account the spectral emission of the source and the spectral response of the detector. In this work we study the influence in the integration accuracy of the number of wavelengths considered in the calculations.
Carles Font +2 more
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Precision CMG Control for High-Accuracy Pointing
Journal of Spacecraft and Rockets, 1973Extremely precise gimbal control, as is necessary for CMG (Control Moment Gyro) high-accuracy-pointing control systems, is obtainable and has been demonstrated for large single-gimbal CMGs. A proportional-plusintegral control law, where the integral gain is substantially greater than the gradient of the gimbal "stiction" profile, makes possible wide ...
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Accuracy evaluation of fixed-point based LMS algorithm
Digital Signal Processing, 2010The implementation of adaptive filters with fixed-point arithmetic requires computation quality evaluation. The accuracy may be determined by computing the global quantization noise power at the system output. In this paper, a new model for evaluating analytically the global noise power in LMS-based algorithms is presented. Thus, the model is developed
Rocher, Romuald +3 more
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Accuracy of a Freezing Point Depression Technique Osmometer
Optometry and Vision Science, 2015The purpose of this study was to examine the precision and accuracy of the Fiske 110 Osmolarity System under different protocols to determine the possible applications of this device in tear film research and clinical practice.Three separate studies were performed. In the first, Fiske 110 measurements were made on undiluted and diluted (1:1, 1:4, and 1:
Hugo, Pena-Verdeal +4 more
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White point accuracy calculation template
2012This template calculates the correlated color temperature (CCT) and the CIE 1976 u'v' chromaticities from the five-point CIE 1931 chromaticity uniformity measurement. It also calculates the corresponding chromaticity differences from a reference white point given by its CCT.
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Point-to-point control of a high accuracy positioning mechanism
Proceedings of the 1997 American Control Conference (Cat. No.97CH36041), 1997Compares three open-loop command generating methods for the point-to-point control of a wafer stage. Whereas the theoretical time-optimal bang-bang force command results in excessive residual vibration due to excitation of resonant modes, shaped force profiles have the property not to excite these modes while still allowing for fast movements. The most
D. De Roover, F.B. Sperling
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Accuracy Analysis of Point Cloud Registration Based on Mark Point
Advanced Materials Research, 2014When optical 3D shape measurement equipment works, they gather dense point cloud using mark points as artificial feature for the purpose of global registration; as a result, rough registration error of multiple scans depends primarily on the location accuracy of these mark points.
Xin He Liang, Jian Wei Liu
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