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Article Citation - WoS: 29Citation - Scopus: 36Massive Mimo Systems for 5g: a Systematic Mapping Study on Antenna Design Challenges and Channel Estimation Open Issues(inst Engineering Technology-iet, 2021) Benzaghta, Mohamed; Rabie, Khaled M.The next generation of mobile networks (5G) is expected to achieve high data rates, reduce latency, as well as improve the spectral and energy efficiency of wireless communication systems. Several technologies are being explored to be used in 5G systems. One of the main promising technologies that is seen to be the enabler of 5G is massive multiple-input multiple-output (mMIMO) systems. Numerous studies have indicated the utility of mMIMO in upcoming wireless networks. However, there are several challenges that needs to be unravelled. In this paper, the latest progress of research on challenges in mMIMO systems is tracked, in the context of mutual coupling, antenna selection, pilot contamination and feedback overhead. The results of a systematic mapping study performed on 63 selected primary studies, published between the year 2017 till the second quarter of 2020, are presented. The main objective of this secondary study is to identify the challenges regarding antenna design and channel estimation, give an overview on the state-of-the-art solutions proposed in the literature, and finally, discuss emerging open research issues that need to be considered before the implementation of mMIMO systems in 5G networks.Article Citation - WoS: 19Citation - Scopus: 27Obtaining Routh-Pade Approximants Using the Luus-Jaakola Algorithm(inst Engineering Technology-iet, 2005) Singh, VThe Routh-Pade approximation problem relating to the construction of a stable reduced-order (rth-order) approximant G(r)(s) for a given stable high-order (nth-order) transfer function G(s), so as to fully retain the first r time moments/Markov parameters of G(s) as well as to minimise the errors between a few subsequent time moments/Markov parameters of G(s) and those of G(r)(s), is revisited. For the solution of this problem, a novel computer-aided method based on the well known Luus-Jaakola algorithm is proposed.Article Citation - WoS: 2Citation - Scopus: 2Global Robust Stability of Interval Delayed Neural Networks(inst Engineering Technology-iet, 2009) Singh, V.; Sıngh, Vımal; Sıngh, Vımal; Department of Mechatronics Engineering; Department of Mechatronics EngineeringIn recent years, the problem of global robust stability of Hopfield-type interval delayed neural networks has received considerable attention. A number of criteria for the global robust stability of such networks have been reported in the literature. On the basis of the idea of dividing (in respect of both the connection weight matrix A and the delayed connection weight matrix B) the given interval into two intervals, four new criteria for the global robust stability of such networks are established. The criteria are in the form of linear matrix inequality and, hence, computationally tractable. The criteria yield a less conservative condition compared with many recently reported criteria, as is demonstrated with an example.Article Citation - WoS: 5Citation - Scopus: 6Miniaturised Antenna at a Sub-Ghz Band for Industrial Remote Controllers(inst Engineering Technology-iet, 2019) Yilmaz, Vadi Su; Bilgin, Gulsima; Aydin, Elif; Kara, AliThis study presents the design and the fabrication of a miniaturised sub-GHz antenna for remote control applications. Miniaturisation techniques were examined to identify the most appropriate topology for sub-GHz band requirements. First, the design parameters of the antenna were determined, and then, a commercial electromagnetic simulation tool was used for the design and optimisation phases. Then, measurements of the fabricated antenna were undertaken. Parametric studies with several iterations were performed to achieve the best possible results. Second, the effects of the box in which the antenna could be placed were examined as most of such antennas are enclosed by plastic boxes. For this purpose, material properties of a typical industrial box available in the market were studied initially, and the most appropriate material of the box was used in simulations. Finally, a polyamide box with appropriate size was fabricated, and the designed antenna was placed inside the box and the measurements were conducted. The measurement results show that the designed antenna provides resonance at the targeted license-free band with adequate size for industrial remote controllers.Editorial Citation - WoS: 2Citation - Scopus: 2Robust Stability of Cellular Neural Networks With Delay: Linear Matrix Inequality Approach - Reply(inst Engineering Technology-iet, 2007) Singh, V.[No Abstract Available]Article Citation - WoS: 20Citation - Scopus: 25Framework for Evaluation and Validation of Software Complexity Measures(inst Engineering Technology-iet, 2012) Misra, S.; Akman, I.; Colomo-Palacios, R.This study proposes a framework for the evaluation and validation of software complexity measure. This framework is designed to analyse whether or not software metric qualifies as a measure from different perspectives. Unlike existing frameworks, it takes into account the practical usefulness of the measure and includes all the factors that are important for theoretical and empirical validation including measurement theory. The applicability of the framework is tested by using cognitive functional size measure. The testing process shows that in the same manner the proposed framework can be applied to any software measure. A comparative study with other frameworks has also been performed. The results reflect that the present framework is a better representation of most of the parameters that are required to evaluate and validate a new complexity measure.Article Citation - WoS: 7Citation - Scopus: 10Efficient Software Review Process for Small and Medium Enterprises(inst Engineering Technology-iet, 2007) Mishra, D.; Mishra, A.A considerable amount of software is produced world-wide by small and medium enterprises (SMEs). These organisations do not have enough resources to implement a rigorous quality plan. It has been established that reviews of various artifacts play a very important role in ensuring the quality of software. Traditional review methods are rigorous and their implementation is cumbersome for SMEs. A new review process which is easy to implement and requires almost no documentation is introduced. It is based on reviewers' efforts to produce high-quality software while minimising the inspection cost. Additionally, people who are conducting this review need not be present at the same place during most phases of the review process. This process has been successfully implemented in a CMM level 3 software development company intending to achieve CMMI level 5 and results are found to be quite encouraging.Article Citation - WoS: 14Citation - Scopus: 18Optimal Routh Approximants Through Integral Squared Error Minimisation: Computer-Aided Approach(inst Engineering Technology-iet, 2004) Singh, V; Chandra, D; Kar, HA computer-aided method for obtaining a reduced-order approximant of a given (stable) single-input single-output system based on the minimisation of integral squared error (ISE) pertaining to a unit-step input is presented. Both the numerator and denominator coefficients of the model are treated as free parameters in the process of optimisation. The method has a built-in stability-preserving feature. The problem of formulating the ISE is circumvented by introducing a set of equality constraints.Article Citation - WoS: 13Citation - Scopus: 13Penetration Depth in Nanoparticles Incorporated Radiofrequency Hyperthermia Into the Tissue: Comprehensive Study With Histology and Pathology Observations(inst Engineering Technology-iet, 2019) Nasseri, Behzad; Kocum, Ismail Cengiz; Seymen, Cemile Merve; Rabiee, NavidIn present study, the effective penetration of radiofrequency (RF) induced gold decorated iron oxide nanoparticles (GS@IONPs) hyperthermia was investigated. The effective penetration depth of RF also the damage potency of hyperthermia was evaluated during histopathology observations which were done on the chicken breast tissue and hepatocellular carcinoma (HCC) models. The thermal damages are well- documented in our previous cellular study which was engaged with potency of RF hyperthermia in Epithelial adenocarcinoma (MCF-7) and fibroblast (L-929) cells deaths [1]. In recent work, PEGylated iron oxide nanoparticles (IONPs) were used as base platform for gold magnetic nanoparticles (GS@IONPs) formation. The 144.00015 MHz, 180W RF generator was applied for stimulating the nanoparticles. The chicken breast tissue and the hepatocellular tumor model was considered in the experimental section. In histology studies, the structural changes also the effective penetration depth of RF induced nanoparticles was observed through microscopic monitoring of the tissue slices in histology observations (Gazi medical school). The highest damage level was seen in 8.0 mu m tissue slices where lower damages were seen in depth of 1.0 cm and more inside tissue. The histology observations clarified the effective penetration depth of RF waves and irreversible damages in the 2.0 cm inside the tissue.Article Citation - WoS: 3Citation - Scopus: 5Equivalent Forms of Single-Operational Transconductance Amplifier Rc Oscillators With Application To Grounded-Capacitor Oscillators(inst Engineering Technology-iet, 2010) Singh, V.It is shown that, given a single-operational transconductance amplifier (OTA) resistor-capacitor (RC) sinusoidal oscillator circuit, it can be put in three other, structurally distinct forms without altering its characteristic equation. This result may facilitate the transformation of some of the available single-OTA RC oscillators employing floating capacitors into the desirable form of employing grounded capacitors. The result turns out to be an aid to a Boolean circuit synthesis method previously given by Tao and Fidler for the generation of single-OTA RC oscillators.
