scholarly journals Off-Center Error Correction of AMR Yokeless Current Transducer

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Pavel Mlejnek ◽  
Pavel Ripka
Keyword(s):  
Error Correction ◽  
Lookup Table ◽  
Circular Array ◽  
Dc Magnetic Field ◽  
Error Corrections ◽  
Feedback Compensation ◽  
Current Transducer ◽  
Center Position ◽  
Current Conductor ◽  
The Individual

We present a method of calibration and error correction of the AMR yokeless current transducer consisting of a circular array of eight anisotropic magnetoresistors (AMR) with one feedback compensation loop. The main sources of errors are the nonidentical parameters of AMR sensors and off-center position of the measured current. It is well known that AMR sensors from the same batch have 2% spread of the sensitivity; we found that the variation of the factor of the internal compensation coil is the same. We developed a novel calibration process using the readings of individual residual uncompensated voltages of the AMRs. The position of the current inside the measurement hole is estimated from the individual voltages considering the influence of external DC magnetic field such as the Earth’s field. During the calibration phase, the sensor outputs are measured for several positions of the current conductor inside the measuring hole. As a result of calibration the lookup table of error corrections is calculated and stored in the memory, and then these values are used for the correction during the measurement of the unknown current. This procedure reduces the off-center error from 0.4% to 0.06%.

scholarly journals Experimental Studies of an Eddy Current Transducer with Spatially Periodic Fields

2018 ◽  
pp. 45-50
Author(s):  
B. Gorkunov ◽  
S. Lvov ◽  
Tamer Shaiban ◽  
Y. Borysenko
Keyword(s):  
Eddy Current ◽  
Experimental Studies ◽  
Fixed Frequency ◽  
Current Transducer ◽  
Current Conductor ◽  
Translation Symmetry ◽  
Spatially Periodic ◽  
Transducer Output ◽  
Angular Coordinates ◽  
Eddy Current Transducer

The purpose of this study is to perform a comparative analysis of the experimentally obtained and calculated values of the measuring windings total EMF amplitudes of the eddy current transducer with spatially periodic fields when magnetic and nonmagnetic cylindrical product are placed in it. To realize this goal in the work, a transducer with translational symmetry of excitation magnetic field has been developed. Translation symmetry typical example is the field of a long current conductor. The paper considers quasi-static electromagnetic field with the wavelength that exceeds characteristic transverse dimensions of conductor and cylinder. As the study result it is seen a satisfactory coincidence of the calculated and experimentally obtained values of the EMF of the transducer output signal in the cases of the product absence and with variety of products. As for example for measuring windings with angular coordinates φ = 30° and 60° an error of voltage values difference is less than 10%. The study shows that the advantage of such transducers while operating on one fixed frequency is capability to perform the multi-parameter testing on account of processing of certain amount of some spatial harmonics of excitation field.

scholarly journals VariantKey: A Reversible Numerical Representation of Human Genetic Variants

2018 ◽  
Author(s):  
Nicola Asuni ◽  
Steven Wilder
Keyword(s):  
Open Source Software ◽  
Genetic Variants ◽  
Data Representation ◽  
Lookup Table ◽  
Memory Allocation ◽  
Computer Memory ◽  
Numerical Representation ◽  
Chromosome Position ◽  
The Individual ◽  
Genomic Regions

AbstractHuman genetic variants are usually represented by four values with variable length: chromosome, position, reference and alternate alleles. There is no guarantee that these components are represented in a consistent way across different data sources, and processing variant-based data can be inefficient because four different comparison operations are needed for each variant, three of which are string comparisons. Existing variant identifiers do not typically represent every possible variant we may be interested in, nor they are directly reversible. Similarly, genomic regions are typically represented inconsistently by three or four values. Working with strings, in contrast to numbers, poses extra challenges on computer memory allocation and data-representation. To overcome these limitations, a novel reversible numerical encoding schema for human genetic variants (VariantKey) and genomics regions (RegionKey), is presented here alongside a multi-language open-source software implementation (https://github.com/Genomicsplc/variantkey). VariantKey and RegionKey represents variants and regions as single 64 bit numeric entities, while preserving the ability to be searched and sorted by chromosome and position. The individual components of short variants can be directly read back from the VariantKey, while long variants are supported with a fast lookup table.

scholarly journals Lookup Table Algorithm for Error Correction in Color Images

2018 ◽  
Vol 2 (2) ◽  
pp. 63
Author(s):  
Ruaa Alaadeen Abdulsattar ◽  
Nada Hussein M. Ali
Keyword(s):  
Error Correction ◽  
Error Detection ◽  
Color Image ◽  
Color Images ◽  
Lookup Table ◽  
Hamming Code ◽  
Detection Techniques ◽  
Error Ratio ◽  
Error Detection And Correction ◽  
Large Burst

Error correction and error detection techniques are often used in wireless transmission systems. A color image of type BMP is considered as an application of developed lookup table algorithms to detect and correct errors in these images. Decimal Matrix Code (DMC) and Hamming code (HC) techniques were integrated to compose Hybrid Matrix Code (HMC) to maximize the error detection and correction. The results obtained from HMC still have some error not corrected because the redundant bits added by Hamming codes to the data are considered inadequate, and it is suitable when the error rate is low for detection and correction processes. Besides, a Hamming code could not detect large burst error period, in addition, the have same values sometimes which lead to not detect the error and consequently increase the error ratio. The proposed algorithm LUT_CORR is presented to detect and correct errors in color images over noisy channels, the proposed algorithm depends on the parallel Cyclic Redundancy Code (CRC) method that's based on two algorithms: Sarwate and slicing By N algorithms. The LUT-CORR and the aforementioned algorithms were merged to correct errors in color images, the output results correct the corrupted images with a 100 % ratio almost. The above high correction ratio due to some unique values that the LUT-CORR algorithm have. The HMC and the proposed algorithm applied to different BMP images, the obtained results from LUT-CORR are compared to HMC for both Mean Square Error (MSE) and correction ratio.  The outcome from the proposed algorithm shows a good performance and has a high correction ratio to retrieve the source BMP image.

Sampling Error Correction Evaluated Using a Convective-Scale 1000-Member Ensemble

2019 ◽  
Vol 148 (3) ◽  
pp. 1229-1249 ◽  
Author(s):  
Tobias Necker ◽  
Martin Weissmann ◽  
Yvonne Ruckstuhl ◽  
Jeffrey Anderson ◽  
Takemasa Miyoshi
Keyword(s):  
Sensitivity Analysis ◽  
Data Assimilation ◽  
Error Correction ◽  
Degrees Of Freedom ◽  
Sampling Error ◽  
Lookup Table ◽  
Ensemble Prediction ◽  
Sampling Errors ◽  
Convective Scale ◽  
The Impact

Abstract State-of-the-art ensemble prediction systems usually provide ensembles with only 20–250 members for estimating the uncertainty of the forecast and its spatial and spatiotemporal covariance. Given that the degrees of freedom of atmospheric models are several magnitudes higher, the estimates are therefore substantially affected by sampling errors. For error covariances, spurious correlations lead to random sampling errors, but also a systematic overestimation of the correlation. A common approach to mitigate the impact of sampling errors for data assimilation is to localize correlations. However, this is a challenging task given that physical correlations in the atmosphere can extend over long distances. Besides data assimilation, sampling errors pose an issue for the investigation of spatiotemporal correlations using ensemble sensitivity analysis. Our study evaluates a statistical approach for correcting sampling errors. The applied sampling error correction is a lookup table–based approach and therefore computationally very efficient. We show that this approach substantially improves both the estimates of spatial correlations for data assimilation as well as spatiotemporal correlations for ensemble sensitivity analysis. The evaluation is performed using the first convective-scale 1000-member ensemble simulation for central Europe. Correlations of the 1000-member ensemble forecast serve as truth to assess the performance of the sampling error correction for smaller subsets of the full ensemble. The sampling error correction strongly reduced both random and systematic errors for all evaluated variables, ensemble sizes, and lead times.

scholarly journals Association between Oral Error Corrections of University Teacher and English Majors’ Language Anxiety in Philippine Higher Education Context

2020 ◽  
Vol 4 (2) ◽  
pp. 183
Author(s):  
Herford Rei Biscayno Guibangguibang
Keyword(s):  
Error Correction ◽  
English Language ◽  
English Teachers ◽  
Language Anxiety ◽  
Self Assessment ◽  
Chi Square ◽  
Mainstream Classrooms ◽  
Error Corrections ◽  
English Major ◽  
High Level

This study sought to answer the question on the level of English language anxiety in the ESL and mainstream classrooms of 61 total number of English major students utilizing the 20-item self-assessment questionnaire of English Language Anxiety Scale (ELAS) developed by Pappamihiel (2002). Actual one-hour footage of classroom was documented through a MONACORR audio-recorder, thrice with each teacher. The recorder was given to one of the teachers’ students without knowledge for the authenticity of their oral corrections. After having identified the existing oral error corrections by the English teachers through audio-recording, a self-made questionnaire was answered by the students to find what is the rate of occurrence of the identified oral error correction styles. The frequency count, weighted mean, and Chi-square tests were the statistical tools used to answer the problems posed in this study. Findings divulged after the transcription, teachers were only utilizing elicitation, explicit correction, recast, and repetition. Moreover, students perceived that elicitation oral error correction type is often used while explicit correction, recast, and repetition are only used sometimes by their English teachers.  Meanwhile, ELAS results indicate levels of language anxiety in the ESL classes and mainstream, although language anxiety is significantly higher in ESL classes. As to correlation, it was found out that the rate of occurrence of explicit correction, recast, and repetition as perceived by ESL English major students of their English teachers’ oral error correction types have no significant relationships to their English language anxiety. This study suggests that oral error correction has nothing to do with the English language anxiety of English major students and that English teachers shall retain the practice of the oral error correction for it does not give high level of learners’ anxiety in learning English. 

scholarly journals Students’ Attitudes towards Written Error Corrections: A Study in an Omani EFL Context

2020 ◽  
Vol 9 (3) ◽  
pp. 210-218
Author(s):  
Peyman Nouraey ◽  
Fatemeh Behjat
Keyword(s):  
Error Correction ◽  
Undergraduate Students ◽  
Efl Context ◽  
Error Corrections ◽  
Foundation Program ◽  
Students Attitudes ◽  
To Receive

Knowing errors and their sources often aids teachers in error correction processes. The present study aimed at investigating how the students of General Foundation Program (GFP) in Oman tend to deal with written error corrections and the related feedback provided to them. It is also an attempt to examine students’ attitudes and preferences towards the feedback on their written errors. In doing so, sixty undergraduate students were selected as participants of the study. A questionnaire was distributed among the participants, containing information on a) when the students would prefer to receive the feedback on their written errors, b) who they would prefer to give the feedback, and c) what type of feedback they would prefer to receive. Findings revealed that the participants would mostly prefer to receive feedback on their written errors during the revising stage. In addition, it was highlighted that feedback provided by the teachers was more popular among the participants as compared to peer or self-corrections. Finally, results indicated that most of the students would prefer to receive feedback on all of their written errors, rather than some or none of the errors.

scholarly journals The Relationship between English Language Learners’ Perceptions towards Classroom Oral Error Corrections and Their Pronunciation Accuracy

2016 ◽  
Vol 6 (7) ◽  
pp. 1
Author(s):  
Afshin Peerdadeh Beiranvand ◽  
Ali Entezamara
Keyword(s):  
English Language Learners ◽  
Error Correction ◽  
Language Learners ◽  
Significant Relationship ◽  
Teaching And Learning ◽  
English Language ◽  
Language Teachers ◽  
Error Corrections ◽  
Positive Attitudes ◽  
Correction Strategies

<p>Inevitably, language learners make mistakes, and teachers correct them. It is, also, crystal clear that language learners have different attitudes towards error and error correction strategies. Needless to say, language teachers’ awareness of language learners’ perceptions towards error and error correction strategies can heighten the quality and the quantity of language teaching and learning process. This study based on the findings of a questionnaire and a test given to 82 male and female English language learners in Iran Language Institute (ILI) investigates: 1) whether ILI English language learners have positive or negative attitudes towards classroom oral error corrections; 2) whether there is a relationship between ILI English language learners’ perceptions towards classroom oral error corrections and their pronunciation accuracy; 3) if there is a relationship between ILI learners’ gender and their attitudes towards classroom oral error corrections. The findings of this study show that ILI English language learners have absolutely positive attitudes towards classroom oral error corrections, which means they want to be corrected. The findings, also, show that there is not any significant relationship between ILI English language learners’ perceptions towards classroom oral error corrections and their pronunciation accuracy. The findings, also, show that there is not any significant relationship between ILI English language learners’ perceptions towards classroom oral error corrections and their gender.</p>

scholarly journals Direction of Arrival Estimation of Uncorrelated Signals Using Root-MUSIC Algorithm for ULAs and UCAs

2018 ◽  
Vol 7 (4.36) ◽  
pp. 398
Author(s):  
S. Venkata Rama Rao ◽  
A. Mallikarjuna Prasad ◽  
Ch. Santhi Rani
Keyword(s):  
Basic Problem ◽  
Signal To Noise Ratio ◽  
Direction Of Arrival ◽  
Doa Estimation ◽  
Circular Array ◽  
Music Algorithm ◽  
Linear Arrays ◽  
Circular Arrays ◽  
Symmetric Structure ◽  
The Individual

In this paper, Root-MUSIC algorithm for direction of arrival (DOA) estimation of uncorrelated signals is explored both for uniform linear and uniform circular arrays. The basic problem in Uniform Linear Arrays (ULAs) is Mutual coupling between the individual elements of the antenna array. This problem is reduced in Uniform Circular Arrays (UCAs) because of its symmetric structure. The DOA estimation of uncorrelated signals that have different power levels is simulated on a MATLAB environment. And the noise consider is white across all the array elements. The factors considered for simulation are number of number of snapshots, array elements, radius of circular array, array length, and signal to noise ratio. 

scholarly journals Individual error correction drives responsive self-assembly of army ant scaffolds

2021 ◽  
Vol 118 (17) ◽  
pp. e2013741118
Author(s):  
Matthew J. Lutz ◽  
Chris R. Reid ◽  
Christopher J. Lustri ◽  
Albert B. Kao ◽  
Simon Garnier ◽  
...  
Keyword(s):  
Error Correction ◽  
Self Assembly ◽  
Field Experiments ◽  
Group Level ◽  
Final Size ◽  
Army Ants ◽  
Individual Level ◽  
Inclined Surfaces ◽  
And Migration ◽  
The Individual

An inherent strength of evolved collective systems is their ability to rapidly adapt to dynamic environmental conditions, offering resilience in the face of disruption. This is thought to arise when individual sensory inputs are filtered through local interactions, producing an adaptive response at the group level. To understand how simple rules encoded at the individual level can lead to the emergence of robust group-level (or distributed) control, we examined structures we call “scaffolds,” self-assembled by Eciton burchellii army ants on inclined surfaces that aid travel during foraging and migration. We conducted field experiments with wild E. burchellii colonies, manipulating the slope over which ants traversed, to examine the formation of scaffolds and their effects on foraging traffic. Our results show that scaffolds regularly form on inclined surfaces and that they reduce losses of foragers and prey, by reducing slipping and/or falling of ants, thus facilitating traffic flow. We describe the relative effects of environmental geometry and traffic on their growth and present a theoretical model to examine how the individual behaviors underlying scaffold formation drive group-level effects. Our model describes scaffold growth as a control response at the collective level that can emerge from individual error correction, requiring no complex communication among ants. We show that this model captures the dynamics observed in our experiments and is able to predict the growth—and final size—of scaffolds, and we show how the analytical solution allows for estimation of these dynamics.

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