An Efficient Parallel Block Compressive Sensing Scheme for Medical Signals and Image Compression

Wireless Personal Communications - Compressive Sensing or Compressed sensing (CS) is a latest technique used for compression of medical signals and medical images which benefits both the speed and...     

A Novel Algorithm to Design Rate-Adaptive Irregular LDPC Codes

Wireless Personal Communications - This paper proposes an algorithm to design rate-adaptive irregular LDPC codes with improved Bit error rate (BER) performance. It focuses on achieving better BER...     

Design and Implementation of Hybrid Compression Algorithm for Personal Health Care Big Data Applications

Wireless Personal Communications - Advanced telemedicine requires the gathering of big data through wireless body area network or internet of things based applications. These networks perform...     

Analysis of Dual Semicircle Shape CSRR Sensor for Dent Detection on Teflon Coated Metal Surfaces

Wireless Personal Communications - In the vast field of E-Commerce and E-Business, the appropriate way of customer analysis is very much important to make a business more successful. In such modes...     

Studies on a Few Substituted Piperidin-4-one Oximes as Corrosion Inhibitor for Mild Steel in HCl

The corrosion inhibition of mild steel in 1 M hydrochloric acid by a few piperidin-4-one oxime derivatives, namely, 1,3-dimethyl-2,6-diphenyl piperidin-4-one oxime (I), 3,3-dimethyl-2,6-diphenyl piperidin-4-one oxime (II), and 3-isopropyl-2,6-diphenyl piperidin-4-one oxime (III) was studied using chemical weight loss method, electrochemical polarization and impedance spectroscopy, SEM with EDS, XRD, FT-IR measurements, and semi-empirical AM1 method for electronic properties. The weight loss measurements at four different temperatures such as 30, 40, 50, and 60 °C showed that the percentage inhibition efficiency (IE) of these compounds increased with increase of concentration and decreased with increase of temperature. The IE followed the order III < II < I. It was found that these inhibitors function through physical adsorption mechanism obeying Temkin’s isotherm. Polarization studies showed that these compounds act as mixed-type inhibitors. Impedance measurements revealed the increase of charge transfer resistance with inhibitor concentration. Surface analysis using SEM, XRD, and FT-IR revealed the formation of protective film over the mild steel surface. The electronic properties calculated using AM1 semi-empirical method explained the inhibition characteristics. The quantum chemical studies showed that ring nitrogen and phenyl rings are the probable active centers to inhibit corrosion process.     

Novel construction of quasi-cyclic low-density parity-check codes with variable code rates for cloud data storage systems

This paper proposed a novel method for constructing quasi-cyclic low-density parity-check (QC-LDPC) codes of medium to high code rates that can be applied in cloud data storage systems, requiring better error correction capabilities. The novelty of this method lies in the construction of sparse base matrices, using a girth greater than 4 that can then be expanded with a lift factor to produce high code rate QC-LDPC codes. Investigations revealed that the proposed large-sized QC-LDPC codes with high code rates displayed low encoding complexities and provided a low bit error rate (BER) of 10⁻¹⁰ at 3.5 dB E_b/N₀ than conventional LDPC codes, which showed a BER of 10⁻⁷ at 3 dB E_b/N₀. Subsequently, implementation of the proposed QC-LDPC code in a software-defined radio, using the NI USRP 2920 hardware platform, was conducted. As a result, a BER of 10⁻⁶ at 4.2 dB E_b/N₀ was achieved. Then, the performance of the proposed codes based on their encoding–decoding speeds and storage overhead was investigated when applied to a cloud data storage (GCP). Our results revealed that the proposed codes required much less time for encoding and decoding (of data files having a 10 MB size) and produced less storage overhead than the conventional LDPC and Reed–Solomon codes.