Analysis of an M/G/1 queueing system with disgruntled jobs and different types of service rate

M. Kannan,V. Poongothai,P. Godhandaraman 한국전산응용수학회 2023 Journal of applied mathematics & informatics Vol.41 No.6

This paper investigates a non Markovian M/G/1 queue with retrial policy, different kind of service rates as well as unsatisfied clients which is inspired by an example of a transmission medium access control in wireless communications. The server tends to work continuously until it finds at least one client in the system. The server will begin its maintenance tasks after serving all of the clients and if the system becomes empty. Provisioning periods in regular working periods and maintenance service periods should be evenly divided. Using supplementary variable technique, the amount of clients in the system as well as in the orbit were found. Further few performance measures of the system were demonstrated numerically.

Feasibility and performance study of turpentine fueled DI diesel engine operated under HCCI combustion mode

M. Kannan,R. Karthikeyan,B. Deepanraj,R. Baskaran 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.2

In the present investigation a volatile fraction of Pinus resin called Turpentine has been experimented in a direct injection diesel engineunder HCCI combustion mode. The engine chosen to experiment is a single cylinder DI diesel engine and modified in such a way toignite Turpentine in a diesel engine under HCCI mode. As the Turpentine has a higher self ignition temperature the ignition of Turpentinein regular diesel engines with auto-ignition is not possible. Hence, suitable modification is made in the engine to ignite Turpentine ina diesel engine like diesel fuel. The modified engine has ECM controlled fuel spray and an air preheater in the suction side of the engine. The combined effort of adiabatic compression and supply of preheated air ignites turpentine by auto-ignition and its timing of ignition isprecisely controlled by changing intake air temperature. This investigation revealed that the engine operated with turpentine performedwell with little loss of brake thermal efficiency. And, emitted comparatively lower emissions such as NOx and smoke and proved that theturpentine is a best suited fuel for HCCI operation.

Biodegradation of Secondary Phase Particles in Magnesium Alloys: A Critical Review

( M. Bobby Kannan ) 한국부식방식학회(구 한국부식학회) 2016 Corrosion Science and Technology Vol.15 No.2

Magnesium alloys have been extensively studied in recent years for potential biodegradable implant applications. A great deal of work has been done on the evaluation of the corrosion behaviour of magnesium alloys under in vitro and in vivo conditions. However, magnesium alloys, in general, contain secondary phase particles distributed in the matrix and/or along the grain boundaries. Owing to their difference in chemistry in comparison with magnesium matrix, these particles may exhibit different corrosion behaviour. It is essential to understand the corrosion behaviour of secondary phase particles in magnesium alloys in physiological conditions for implant applications. This paper critically reviews the biodegradation behaviour of secondary phase particles in magnesium alloys.

Cobalt substituted layered O3 and P2-type Na-Ti-Ni-Co-O anode materials for emerging sodium-ion batteries

K. Kannan,M. Kouthaman,P. Arjunan,R. Subadevi,M. Sivakumar 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.102 No.-

Sodium ion batteries (SIBs) are considered as a propitious candidate for large scale energy storage devicesdue to the copious of sodium resources in earth crust and low cost. In this work, layered Cobalt (Co) substitutedO3-type NaTi0.6Ni0.3Co0.1O2 (O3-NTNC) and P2-type Na0.5Ti0.6Ni0.3Co0.1O2 (P2-NTNC) anodematerials were prepared by solid-state reaction for SIBs. The prepared O3-NTNC and P2-NTNC can beassigned to rhombohedral and hexagonal structure with the space group of R-3m and P63/mmc respectively,using Rietveld refinement. O3-NTNC and P2-NTNC delivered the reversible capacity of 108 and96 mAh g 1 at 0.1C and revealed coulombic efficiency over 90% even after 50 cycles. In addition, partialCo-substitution enhanced the structural stability of the obtained materials during sodiation and desodiationprocess.

Characterization of lead resistant endophytic Bacillus sp. MN3-4 and its potential for promoting lead accumulation in metal hyperaccumulator Alnus firma

Shin, M.N.,Shim, J.,You, Y.,Myung, H.,Bang, K.S.,Cho, M.,Kamala-Kannan, S.,Oh, B.T. Elsevier Scientific Pub. Co 2012 Journal of hazardous materials Vol.199 No.-

The aim of this study was to isolate and characterize endophytic bacteria from the roots of the metal hyperaccumulator plant Alnus firma. A total of 14 bacterial endophytes were isolated from root samples and assayed for tolerance to heavy metals. Isolate MN3-4 exhibited maximum bioremoval of Pb and was subsequently identified as Bacillus sp. based on 16S rRNA sequences. The pH and initial metal concentration highly influenced the Pb bioremoval rate. The growth of isolate MN3-4 was moderately altered in the presence of metals. Scanning electron microscopy, energy dispersive spectroscopy, biological-transmission electron microscopy, and Fourier transform infrared spectroscopy studies revealed that isolate MN3-4 had extracellularly sequestered the Pb molecules with little intracellular accumulation. Isolate MN3-4 did not harbor pbrA and pbrT genes. Moreover, isolate MN3-4 had the capacity to produce siderophores and indoleacetic acid. A root elongation assay demonstrated an increase (46.25%) in the root elongation of inoculated Brassica napus seedlings compared to that of the control plants. Obtained results pointed out that isolate MN3-4 could potentially reduce heavy metal phytotoxicity and increase Pb accumulation in A. firma plants.

A New Selective Assembly Model for Achieving Specified Tolerance in High Precision Assemblies

S. M. Kannan,G. Raja Pandian 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.7

Manufacturing of high precision assemblies pose a great challenge to engineers. High precision assemblies are generally assembled using selective assembly when the assembly tolerance requirement is less than the sum of the part tolerances. Although extensive research has been done in selective assembly modelling for minimising surplus parts and tolerance variation, they do not suit given specifications. In this paper, a new selective assembly model using a genetic algorithm is proposed to provide a detailed method for assembling parts for achieving specified assembly tolerance with minimum surplus parts. This model provides the best combination of selective groups and the number of assemblies in each group and so the assembly process is simplified. Genetic Algorithm is used to find the best combinations and the number of assemblies in each combination to minimize surplus parts. This paper analyses the effectiveness of the model for given target assembly tolerance for a linear assembly and it can be extended to any type of product.

Welding Parameter Optimization by Whale Optimization Algorithm and Experimental Investigation on Microstructure and Mechanical Properties of Spin Arc Welded 15CDV6 HSLA Steel

G. Rajesh Kannan,P. Sathiya,T. Deepan Bharathi Kannan,M. Bhuvanesh Kumar 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9

In this work, the technique of spin arc welding has been used to weld HSLA steel of grade 15CDV6. Experiments wereperformed according to the L9 Taguchi matrix using current, travel speed, wire feed rate, and spin rotation speed as inputparameters. The quality of the weld was analysed by measuring the bead geometry and microhardness. The Whale OptimizationAlgorithm (WOA) was used to identify the optimized welding parameters. The optimised parameters were identifiedthrough WOA as follows: current 230 A, voltage 24 V, travel speed 720 mm/min, and spin rotation speed 1500 rpm. Thepost-weld heat treatment (PWHT) was performed on the optimised welded sample to enhance the weld properties. Themicrohardness was increased by 79% after PWHT. Ferrite content was found to have reduced after welding and PWHT thegrain size and structure of the BM, HAZ, and WM were analysed by EBSD technique. The decrease in ferrite content hada significant effect on the microhardness. The Energy Dispersive Spectroscopy results showed the presence of Vanadiumcarbide (VC) precipitates which helped in increasing the microhardness.

NSGA-II Technique for Multi-objective Generation Dispatch of Thermal Generators with Nonsmooth Fuel Cost Functions

M. Rajkumar,K. Mahadevan,S. Kannan,S. Baskar 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.2

Non-dominated Sorting Genetic Algorithm-II (NSGA-II) is applied for solving Combined Economic Emission Dispatch (CEED) problem with valve-point loading of thermal generators. This CEED problem with valve-point loading is a nonlinear, constrained multi-objective optimization problem, with power balance and generator capacity constraints. The valve-point loading introduce ripples in the input-output characteristics of generating units and make the CEED problem as a nonsmooth optimization problem. To validate its effectiveness of NSGA-II, two benchmark test systems, IEEE 30-bus and IEEE 118-bus systems are considered. To compare the Pareto-front obtained using NSGA-II, reference Pareto-front is generated using multiple runs of Real Coded Genetic Algorithm (RCGA) with weighted sum of objectives. Comparison with other optimization techniques showed the superiority of the NSGA-II approach and confirmed its potential for solving the CEED problem. Numerical results show that NSGA-II algorithm can provide Pareto-front in a single run with good diversity and convergence. An approach based on Technique for Ordering Preferences by Similarity to Ideal Solution (TOPSIS) is applied on non-dominated solutions obtained to determine Best Compromise Solution (BCS).

Tracking/Erosion Resistance Analysis of Nano-Al(OH)₃ Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

Kannan, P.,Sivakumar, M.,Mekala, K.,Chandrasekar, S. The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.1

HVDC technology has become popular as an economic mode of bulk power transmission over very long distances. Polymeric insulators in HVDC power transmission lines are affected by surface tracking and erosion problems due to contamination deposit, which pose a greater challenge in maintaining the reliability of the HVDC system. In addition, polymeric insulators are also naturally affected by aging due to various environmental stresses, which in turn accelerates the surface tracking and erosion problems. Research works towards the improvement of tracking and erosion resistance of polymeric insulators by adding nano-sized fillers in the base material are being carried out worldwide. However, surface tracking and erosion performance of nano-filled aged polymeric insulators for HVDC applications are not well reported. Hence, in the present work, tracking and erosion resistance of the nano $Al(OH)_3$ filled silicone rubber insulation material has been evaluated under DC voltages at different filler concentrations and aged conditions, as per IEC 60587 test procedures. Leakage current and contact angle measurements were carried out to understand the surface hydrophobicity. Moving average technique was used to analyze the trend followed by leakage current. Water aged specimen shows less tracking resistance when compared with thermal aged specimen. It is observed that nano-filler concentration of 5% is even sufficient to get better tracking/erosion resistance under DC voltages.

CRYPTOGRAPHIC ALGORITHM INVOLVING THE MATRIX Q^p*

Kannan, J.,Mahalakshmi, M.,Deepshika, A. The Kangwon-Kyungki Mathematical Society 2022 한국수학논문집 Vol.30 No.3

Cryptography is one of the most essential developing areas, which deals with the secure transfer of messages. In recent days, there are more number of algorithms have been evolved to provide better security. This work is also such an attempt. In this paper, an algorithm is presented for encryption and decryption which employs the matrix Q^p* and the well- known equation x² - py² = 1 where p is a prime.