Chandigarh University

About: Chandigarh University is a education organization based out in Mohali, India. It is known for research contribution in the topics: Computer science & Chemistry. The organization has 1358 authors who have published 2104 publications receiving 10050 citations.

CPW fed rectangular rings-based patch antenna with DGS for WLAN/UNII applications

Abstract: The spectral congestion in existing Industrial, Scientific, and Medical (ISM) Wireless Local Area Network (WLAN) bands has led to the emergence of new ISM bands (Unlicensed National Information Infrastructure (UNII)) from 5.150 to 5.710 GHz. In this paper, a simple uniplanar, high gain, microstrip antenna is designed, fabricated, and tested for existing WLAN and new UNII standards. The proposed antenna provides dualband operation by joining two rectangular rings and cutting Defected Ground Structure in the Coplanar Wave Guide (CPW) feed. The experimental and simulation results show good return loss characteristics and stable radiation pattern over the desired frequency bands ranging from 2.20 to 2.65 GHz (WLAN band) at a lower frequency and from 5.0 to 5.45 GHz (UNII-1/UNII-2 bands). The measured peak gains are 5.5 and 4.9 dBi at 2.45 GHz (WLAN band) and 5.15 GHz (UNII band), respectively.

A Security and Confidentiality Survey in Wireless Internet of Things (IoT)

Abstract: Internet of Things (IoT) is regarded one of the evolving technologies that offers many vertical industries excellent possibilities. The IoT paradigm paves the way for a world that connects many of our every object and communicates with their environments for information collection and task automation. Such a vision requires data privacy, safety, assault robustness, simple deployment, and self-maintenance. Wireless IoT is a successful area that continually collects, exchanges and stores big amounts of data and information. While these data and information are used in wireless IoT for excellent reasons, major dangers emerge as attackers seek to take advantage of the merits of this latest technology for their own benefit. IoT pervasive growth is noticeable worldwide. Devices are readily exposed in such a resource-constrained setting. This paper presents the classic wireless IoT application scenarios, along with associated models of safety and privacy assault. This paper further presents recent advances in Wireless IoT privacy conservation mechanisms along with classification of the application scenarios. In this paper, open problems and future research directions are addressed for the implementation situations in wireless IoT.

In-doped ZnS nanoparticles: structural, morphological, optical and antibacterial properties

Abstract: The present work deals with the effect of indium doping (0 ≤ x ≤ 0.10) on the structural, morphological, compositional and optical properties of the chemically synthesized Zn1−xInxS nanoparticles. In addition, the antibacterial activity of Zn1−xInxS nanoparticles is examined by the disc diffusion method. XRD results have revealed that In3+ ions are successfully incorporated into the host ZnS structure and exhibit zincblende structure and the crystallite size is reduced with indium doping. FE-SEM displayed substantial variation in the spherical morphology of the ZnS nanoparticles with indium addition. EDX analysis identified the proportional amount of indium, zinc and sulphur elements, and the elemental mapping confirmed their distribution in the synthesized nanoparticles. The IR absorption peaks of functional groups present in Zn1−xInxS nanoparticles are studied using FTIR spectra, and the observed absorption bands between 700 cm−1 and 500 cm−1 are perceived for the characteristics Zn–S and In–S stretching modes. The optical absorption edge for all the samples is found to be blueshifted with respect to bulk ZnS, and strong quantum confinement is anticipated with the widening of band gap from 4.03 eV to 4.20 eV with indium doping. Furthermore, the pristine and doped Zn1−xInxS nanoparticles are found to inhibit the growth of both gram-positive and gram-negative bacteria in the range of 20–100 µg/ml. Enhanced antibacterial activity is observed for Zn1−xInxS nanoparticles with x = 0.10 as compared to other compositions. Besides, the optoelectronic perceptions are contingent on the evident variations in the optical properties and the antibacterial action of Zn1−xInxS nanoparticles can be utilized in the drug-resistant challenges of the microbial world.

Optimizing backup power systems through Six Sigma

Abstract: Purpose – The aim of this paper is to follow an analytic-deductive approach to realize the issues related to the present power crisis and growing demand of backup power systems (BPSs), especially in India. It not only explores the need of high-cost BPSs in the current scenario but also puts an emphasis to reduce the running cost through parametric optimizations. Design/methodology/approach – Literature review identifies dependency of every sector on BPS and also highlights present and future challenges erupting in this age of power scarcity. Different improvement initiatives being used to improve efficiency of BPS have been studied, but quite rare application of Six Sigma in BPS sector, in actual was found. A define-measure-analyze-improve-control (DMAIC) model of Six Sigma is being suggested and practiced for bringing a breakthrough in efficiency or mileage of a diesel genset (used as a BPS). Findings – Importance of BPS cannot be ignored, particularly in developing countries, but feeble effort was seen ...