Background: Smart grid systems require high-quality Phasor Measurement Unit (PMU) data for proper operation, control, and decision-making. Missing PMU data may lead to improper actions or even blackouts. While the conventional cubic interpolation methods based on the solution of a set of linear equations to solve for the cubic spline coefficients have been applied by many researchers for interpolation of missing data, the computational complexity increases non-linearly with increasing data size.
Methods: In this work, a modified recurrent equation-based cubic spline interpolation procedure for recovering missing PMU data is proposed. The recurrent equation-based method makes the computations of spline constants simpler. Using PMU data from the State Load Despatch Center (SLDC) in Madhya Pradesh, India, a comparison of the root mean square error (RMSE) values and time of calculation (ToC) is calculated for both methods.
Results: The modified recurrent relation method could retrieve missing values 10 times faster when compared to the conventional cubic interpolation method based on the solution of a set of linear equations. The RMSE values have shown the proposed method is effective even for special cases of missing values (edges, continuous missing values).
Conclusions: The proposed method can retrieve any number of missing values at any location using observed data with a minimal number of calculations.
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http://dx.doi.org/10.12688/f1000research.73182.3 | DOI Listing |
Nephrology (Carlton)
January 2025
Jawaharlal Institute of Post Graduate Medical Education and Research, Puducherry, India.
Chronic kidney disease (CKD) prevalence varies widely across different regions of India. We aimed to identify the status of CKD in India, by systematically reviewing the published community-based studies between the period of January 2011 to December 2023. PubMed, Scopus, and EMBASE were searched for peer-reviewed evidence.
View Article and Find Full Text PDFArthroplast Today
December 2024
Südtiroler Sanitätsbetrieb, Department Orthopaedic Surgery, Brixen, Italy.
Background: Unrestricted kinematic alignment (uKA) in total knee arthroplasty (TKA) has the theoretical advantage of reproducing patients' constitutional alignment and restoring the pre-arthritic joint line position and obliquity. However, modifications of the original uKA technique have been proposed due to the potential risk of mechanical failure and instability. Given the significant variability in soft tissue behavior within the same bony morphology group, uKA pure knee resurfacing could be occasionally detrimental.
View Article and Find Full Text PDFInt J Mol Sci
November 2024
Department for Transfusion Medicine, University Hospital of Salzburg (SALK), Paracelsus Medical University (PMU) Salzburg, Muellner Hauptstraße 48, 5020 Salzburg, Austria.
In regenerative medicine, stromal cells are supposed to play an important role by modulating immune responses and differentiating into various tissue types. The aim of this study was to investigate the influence of heparin, frequently used as an anticoagulant in human platelet lysate (HPL)-supplemented cell cultures, on the expression of non-coding RNA species, particularly microRNAs (miRNA), which are pivotal regulators of gene expression. Through genomic analysis and quantitative RT-PCR, we assessed the differential impact of heparin on miRNA expression in various stromal cell types, derived from human bone marrow, umbilical cord and white adipose tissue.
View Article and Find Full Text PDFISA Trans
December 2024
Department of Electrical Engineering, National Institute of Technology Rourkela, Odisha, India. Electronic address:
Accurate estimation of low frequency modes in power system are very much important for improving small signal stability. The parametric model parameters estimator known as Total least square estimation of signal parameters via rotational invariance techniques (TLS-ESPRIT) works effectively even in noisy conditions. However, this model parameter estimator requires prior information about numbers of modes of the signal.
View Article and Find Full Text PDFActa Neurochir (Wien)
December 2024
Department of Oral and Maxillofacial Surgery, University Hospital Salzburg, Paracelsus Medical University, Salzburg, Austria.
Purpose: Computer-aided design (CAD) and computer-aided manufacturing (CAM) techniques have paved the way for single-step resections and cranio-orbital reconstructions with patient specific implants in spheno-orbital tumors. Here, we present our interdisciplinary maxillofacial and neurosurgical workflow and a case series of patients treated with this integrated approach.
Methods: Patients, who underwent single-step resection of benign spheno-orbital tumors and cranio-orbital reconstruction with polyetheretherketone (PEEK) patient specific implants (PSI) from 2019 to 2024 in our institution were included.
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