Approaches to Evaluation of Profiler Accuracy

2003 ◽  
Vol 1860 (1) ◽  
pp. 129-136 ◽  
Author(s):  
Yongqi Li ◽  
James Delton
Keyword(s):  
Calculation Method ◽  
High Accuracy ◽  
Statistical Correlation ◽  
Definition Of

The inadequacy of the existing ASTM E950 method for definition of the bias of an inertial profiler in the measurement of a pavement profile is analyzed. An improved bias calculation method is proposed. An analysis of the profile measurements and international roughness indexes (IRIs) of four pavement locations was conducted, and the results show that there is no statistical correlation between the profile biases and IRI bias. This analysis demonstrates that a profiler classified as having high accuracy in measuring profiles by ASTM E950 or other proposed bias criteria does not necessarily provide an accurate measurement of IRI. Therefore, it is recommended that the accuracy of a profiler in the measurement of IRI be evaluated independently when IRI, instead of profile, is used for a smoothness specification or other purposes. A criterion to evaluate profilers’ accuracy to measure IRI is developed based on the concept of probability.

scholarly journals Use of Heuristics during the clinical decision process in from family physicians in real conditions.

2021 ◽  
Author(s):  
Carmen Fernández Aguilar ◽  
José-Jesús Martín-Martín ◽  
Sergio Minué-Lorenzo ◽  
Alberto Fernández Ajuria
Keyword(s):  
Primary Care ◽  
Decision Process ◽  
Primary Care Physicians ◽  
Clinical Decision ◽  
Diagnostic Error ◽  
Operational Definition ◽  
Statistical Correlation ◽  
Diagnostic Process ◽  
Representativeness Heuristic ◽  
Definition Of

Rationale, aims and objectives: The available evidence on the existence and consequences of the use of heuristics in the clinical decision process is very scarce. The purpose of this study is to measure the use of the Representativeness, Availability and Overconfidence heuristics in real conditions with Primary Care physicians in cases of dyspnea and to study the possible correlation with diagnostic error. Methods: A prospective cohort study was carried out in 4 Primary Care centers in which 371 new cases or dyspnea were registered. The use of the three heuristics in the diagnostic process is measured through an operational definition of the same. Subsequently, the statistical correlation with the identified clinical errors is analyzed. Results: In 9.97% of the registered cases a diagnostic error was identified. In 49.59% of the cases, the physicians used the representativeness heuristic in the diagnostic decision process. The availability heuristic was used by 82.38% of the doctors and finally, in more than 50% of the cases the doctors showed excess confidence. None of the heuristics showed a statistically significant correlation with diagnostic error. Conclusion: The three heuristics have been used as mental shortcuts by Primary Care physicians in the clinical decision process in cases of dyspnea, but their influence on the diagnostic error is not significant. New studies based on the proposed methodology will allow confirming both its importance and its association with diagnostic error.

Research of Interference Field Measurement and Error Compensation for Geomagnetic Navigation

2014 ◽  
Vol 602-605 ◽  
pp. 1586-1589 ◽  
Author(s):  
Guang Sheng Liu ◽  
Zhen Zhen Guan
Keyword(s):  
Magnetic Field ◽  
Magnetic Dipole ◽  
Calculation Method ◽  
Field Measurement ◽  
Error Compensation ◽  
High Accuracy ◽  
Magnetic Field Measurement ◽  
Interference Field ◽  
Aeromagnetic Survey ◽  
Designed Experiments

Aiming at removing interference field in the geomagnetic navigation, the technology of interference magnetic field measurement and error compensation are studied. The scheme of error measuring and compensating are designed, the compensation model is established based on the magnetic dipole theory, its calculation method is designed, experiments prove that this technology is of high accuracy and its process is simpler, it provides a new way for eliminating interference in the aeromagnetic survey.

Fault Identification Algorithm of Power Grid Based on Wide Area Information and PNN

2015 ◽  
Vol 738-739 ◽  
pp. 382-390
Author(s):  
Hao Wu ◽  
Qun Zhan Li ◽  
Wei Liu
Keyword(s):  
Fault Tolerance ◽  
Feature Vector ◽  
Power Grid ◽  
High Accuracy ◽  
Wide Area ◽  
Fault Identification ◽  
Identification Algorithm ◽  
Simulation Experiments ◽  
Definition Of ◽  
Grid Based

With the help of wide area information, a new fault identification algorithm of power grid based on PNN is proposed. This algorithm gives a definition of the line associated domain, the elements’ action information of the line associated domain gathered by line IEDs can form the feature vector into PNN classifier, and then the fault elements of power grid would be identified on PNN classifier. Through a large number of simulation experiments, it shows that the new fault identification algorithm of power grid based on PNN and wide area information has high accuracy and good fault tolerance.

High-accuracy four-dimensional trajectory prediction for civil aircraft

2012 ◽  
Vol 116 (1175) ◽  
pp. 45-66 ◽  
Author(s):  
W. Schuster ◽  
M. Porretta ◽  
W. Ochieng
Keyword(s):  
Flight Control ◽  
Three Dimensional ◽  
High Accuracy ◽  
Trajectory Prediction ◽  
Entire Duration ◽  
Civil Aircraft ◽  
Model Aircraft ◽  
Simplifying Assumptions ◽  
Definition Of ◽  
Better Than

AbstractCurrent state-of-the-art trajectory prediction tools typically model aircraft as three-dimensional point-masses, and make a number of simplifying assumptions about the actual and anticipated dynamics states of the aircraft. They are typically based on predefined settings obtained from existing databases such as Eurocontrol’s Bada rather than real-time information, including on the environment, available onboard the aircraft. This significantly limits trajectory prediction performance. This paper proposes a high-accuracy four-dimensional trajectory prediction model for use onboard civil aircraft, as well as by ground-based systems, which addresses these limitations. It is designed for strategic traffic capacity optimisation and conflict-detection and resolution over time-horizons covering the entire duration of a flight. The model incorporates a number of features including a novel flight-control-system and an enhanced flight-script that incorporates new taxonomy and content thereby enabling better definition of aircraft intent. The accuracy of the model is characterised using operational data acquired during a real flight trial. Results show that the performance of the proposed model is significantly better than the current models. Its accuracy is better than the required navigation performance for departure, en route and Non-Precision-Approach phases of flight.

scholarly journals Progress on vacuum-to-air mass calibration system using magnetic suspension to disseminate the Planck-constant realized kilogram

ACTA IMEKO ◽  
2017 ◽  
Vol 6 (2) ◽  
pp. 70 ◽  
Author(s):  
Eric Carl Benck ◽  
Corey Stambaugh ◽  
Edward Mulhern ◽  
Patrick Abbott ◽  
Zeina Kubarych
Keyword(s):  
International System ◽  
High Accuracy ◽  
Magnetic Suspension ◽  
Calibration System ◽  
Font Size ◽  
Planck Constant ◽  
Air Mass ◽  
System Of Units ◽  
Mass Calibration ◽  
Definition Of

<p><span style="font-size: small;">The kilogram is the unit of mass in the International System of units (SI) and has been defined as the mass of the International Prototype Kilogram (IPK) since 1889.  </span><span style="font-size: small;">In the future, a new definition of the kilogram will be realized by fixing the value of the Planck constant.</span><span style="font-size: small;">  </span><span style="font-size: small;">The new definition of the unit of mass will occur in a vacuum environment by necessity, so the National Institute of Standards and Technology (NIST) is developing a mass calibration system in which a kilogram artefact in air can be directly compared with a kilogram realized in a vacuum environment.</span><span style="font-size: small;">  </span><span style="font-size: small;">This apparatus uses magnetic suspension to couple the kilogram in air to a high accuracy mass balance in vacuum.</span><span style="font-size: small;"> </span></p><p> </p>

scholarly journals Automation of the forecasting process for wells base production

2021 ◽  
Vol 6 (2) ◽  
pp. 45-49
Author(s):  
A. A. Rybakovskaya ◽  
I. V. Fakhretdinov ◽  
A. A. Prokhorov ◽  
T. Ch. Fatkhullin ◽  
A. N. Zvada ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Calculation Method ◽  
High Accuracy ◽  
Actual Data ◽  
Production Forecast ◽  
Calculation Time ◽  
Recoverable Reserves ◽  
Actual Production ◽  
Forecast Data ◽  
Report Data

The article describes the automation of the production forecast calculation method for producing wells. Calculation for each well based on monthly production report data and current residual recoverable reserves. The Arps curve and the Corey function are used to approximate the actual production curves. Comparative analysis of actual data with retro-forecast data showed high accuracy with a short calculation time.

scholarly journals Definition of Speech Intelligibility of the Uzbek Language

2020 ◽  
Vol 9 (3) ◽  
pp. 2863-2865
Keyword(s):  
Gaussian Mixture Model ◽  
Mixture Model ◽  
Speech Intelligibility ◽  
Voice Recognition ◽  
Gaussian Mixture ◽  
High Accuracy ◽  
Definition Of ◽  
Personality Recognition

This article proposes an algorithm for automating the process of personality recognition based on voice, provides an analysis of existing methods used to solve the problem that needs to be solved. A method was implemented based on the Gaussian mixture model, which distinguishes a person’s voice with high accuracy. The components of this model allow you to simulate sound characteristics that are unique to each person. The results of the proposed algorithm and the use of voice recognition based on the results of the proposed algorithm are presented.

Definition of geodetic height namely by measured geocentric coordinates

2017 ◽  
Vol 921 (3) ◽  
pp. 20-23
Author(s):  
Y.P. Kureniov ◽  
T.N. Malik
Keyword(s):  
Calculation Method ◽  
Moving Target ◽  
Iterative Calculation ◽  
Geodetic Height ◽  
Definition Of ◽  
Geocentric Coordinates

The article describes one of the methods for determining the geodetic height by using the satellite as a moving target points. It is shown that the chronology of the development of the satellite method for determining the geodetic height of the iterative calculation method for the open-closed formulas for the dependence of the geodetic latitude and, finally, to closed formulas determining the geodetic height in function exclusively from geocentric coordinates. This article describes the geometrical (volumetric and flat) models to perform the derivation of the formulas for determining the geodetic height as a function of the geocentric coordinates of the point. Two variants of the formulas obtained by the authors to determine the geodetic height.

scholarly journals RMS Current of a Photovoltaic Generator in Grid-Connectedcmd="newline"PV Systems: Definition and Application

2008 ◽  
Vol 2008 ◽  
pp. 1-7 ◽  
Author(s):  
P. J. Pérez ◽  
G. Almonacid ◽  
J. Aguilera ◽  
J. de la Casa
Keyword(s):  
Calculation Method ◽  
Energy Losses ◽  
Pv Systems ◽  
Easy Calculation ◽  
Definition Of ◽  
Pv Generator ◽  
Original Concept

This paper includes a definition of a new and original concept in the photovoltaic field,RMS currentof a photovoltaic generator for grid-connected systems. TheRMS currentis very useful for calculating energy losses in cables used in a PV generator. As well, acurrent factorhas been defined in order to simplifyRMS currentcalculation. This factor provides an immediate (quick and easy) calculation method for theRMS currentthat does not depend on the case particular conditions (orientation, location, etc.).RMS currentandcurrent factorvalues have been calculated for different locations and modules.

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