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RISS 인기검색어
- 검색키워드
- 저자 : S. Muralidharan (검색결과 10 건)
- 무료
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- 유료
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S.Anbarasi,S. Muralidharan 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
Penetration of renewable energy sources makes the modern interconnected power systems to have more intelligence and flexibility in the control. Hence, it is essential to maintain the system frequency and tie-line power exchange at nominal values using Load Frequency Control (LFC) for efficient, economic and reliable operation of power systems. In this paper, intelligent tuning of the Proportional Integral Derivative (PID) controller for LFC in an interconnected power system is considered as a main objective. The chosen problem is formulated as an optimization problem and the optimal gain parameters of PID controllers are computed with three innovative swarm intelligent algorithms named Particle Swarm Optimization (PSO), Bacterial Foraging Optimization Algorithm (BFOA) and hybrid Bacterial Foraging Particle Swarm Optimization (BFPSO) and a comparative study is made between them. A new objective function designed with necessary time domain specifications using weighted sum approach is also offered in this report and compared with conventional objective functions. All the simulation results clearly reveal that, the hybrid BFPSO tuned PID controller with proposed objective function has better control performances over other optimization methodologies.
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Muralidharan Dhanya,Paul Arun John,Panangadanakath Suhaila,Nandakumar Sreelakshmi T.,Poothotill Shana S.,MoiduKunhi Rahila A.,Ameen Zainul 대한예방의학회 2025 예방의학회지 Vol.58 No.5
Objectives: Public acceptance of a vaccine determines whether pandemic control is successful. Most studies assessing coronavirus disease 2019 (COVID-19) vaccine acceptance were conducted before the vaccine became publicly available, whereas the actual intent to be vaccinated often differs once the vaccine is accessible. Therefore, this study investigated COVID-19 vaccine acceptance, hesitancy, and associated determinants among the general population of Kerala, India, after the vaccine became available.Methods: A cross-sectional descriptive online survey was conducted using a structured and validated questionnaire in both English and Malayalam. It collected information on contextual influences, individual perceptions, group influences, COVID-19 vaccine-specific factors, and attitudes toward COVID-19 vaccination.Results: Of the 1078 participants, 85.0% (n=916) accepted the COVID-19 vaccine, while 15.0% (n=162) were hesitant. Factors predicting vaccine hesitancy included male sex, younger age, lower educational attainment (school level), lower income, being unmarried, and not having children. Key determinants of vaccine hesitancy identified were concerns regarding vaccine safety and effectiveness, lack of trust in the government, insufficient information provided through the vaccination program, disbelief in vaccination’s protective role against COVID-19, and perception of the vaccination process as complicated and inconvenient.Conclusions: Vaccine-hesitant individuals do not perceive COVID-19 vaccination as a social responsibility to their community. Digitization of the vaccination process may not be suitable for all segments of society, indicating that additional support for persons from lower socioeconomic statuses may be necessary to enhance acceptance. The newly identified areas of concern can guide government and healthcare workers, both nationally and globally, in effectively addressing and mitigating vaccine hesitancy.
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Anbarasi, S.,Muralidharan, S. The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
Penetration of renewable energy sources makes the modern interconnected power systems to have more intelligence and flexibility in the control. Hence, it is essential to maintain the system frequency and tie-line power exchange at nominal values using Load Frequency Control (LFC) for efficient, economic and reliable operation of power systems. In this paper, intelligent tuning of the Proportional Integral Derivative (PID) controller for LFC in an interconnected power system is considered as a main objective. The chosen problem is formulated as an optimization problem and the optimal gain parameters of PID controllers are computed with three innovative swarm intelligent algorithms named Particle Swarm Optimization (PSO), Bacterial Foraging Optimization Algorithm (BFOA) and hybrid Bacterial Foraging Particle Swarm Optimization (BFPSO) and a comparative study is made between them. A new objective function designed with necessary time domain specifications using weighted sum approach is also offered in this report and compared with conventional objective functions. All the simulation results clearly reveal that, the hybrid BFPSO tuned PID controller with proposed objective function has better control performances over other optimization methodologies.
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A Reproducible High Etch Rate ICP Process for Etching of Via-Hole Grounds in 200 ㎛ Thick GaAs MMICs
D. S. Rawal,Vanita R. Agarwal,H. S. Sharma,B. K. Sehgal,R. Muralidharan 대한전자공학회 2008 Journal of semiconductor technology and science Vol.8 No.3
An inductively coupled plasma etching process to replace an existing slower rate reactive ion etching process for 60 ㎛ diameter via-holes using Cl2/BCl3 gases has been investigated. Process pressure and platen power were varied at a constant ICP coil power to reproduce the RIE etched 200 ㎛ deep via profile, at high etch rate. Desired etch profile was obtained at 40 mTorr pressure, 950 W coil power, 90W platen power with an etch rate ~ 4 ㎛/min and via etch yield >90% over a 3-inch wafer, using 24 ㎛ thick photoresist mask. The etch uniformity and reproducibility obtained for the process were better than 4%. The metallized via-hole dc resistance measured was ~ 0.5 Ω and via inductance value measured was ~ 83 pH.
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Evaluation of Composite Cements using Cyclic Polarization Techniques
V. Saraswathy,S. Muralidharan,L. Balamurugan,P. Kathirvel,A. S. S. Sekar 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.8
Slag Cement (PSC) extracts in the presence and absence of nitrite inhibitor were studied by cyclic polarization technique. Studies also carried out in composite (binary and ternary) cement extracts. The re-passivation potential (Erep) is an important parameter to characterize the corrosion resistant property of cements and the efficiency of inhibitor. Blended cements (PPC and PSC) have higher tolerable limit of chloride than OPC. Binary cements increase the tolerable limit of chloride than individual cements. The passivity of steel maintained by ternary cement was found to be less than 45000 ppm of chloride along with 5000 ppm of nitrite (pitting occurred at 45000 ppm). This chloride level is more than that of chlorides in natural sea water (35000 ppm). Hence the use of composite cement especially in marine atmosphere increases the corrosion resistance of steel in concrete.
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A Reproducible High Etch Rate ICP Process for Etching of Via-Hole Grounds in 200μm Thick GaAs MMICs
Rawal, D.S.,Agarwal, Vanita R.,Sharma, H.S.,Sehgal, B.K.,Muralidharan, R. The Institute of Electronics and Information Engin 2008 Journal of semiconductor technology and science Vol.8 No.3
An inductively coupled plasma etching process to replace an existing slower rate reactive ion etching process for $60{\mu}m$ diameter via-holes using Cl2/BCl3 gases has been investigated. Process pressure and platen power were varied at a constant ICP coil power to reproduce the RIE etched $200{\mu}m$ deep via profile, at high etch rate. Desired etch profile was obtained at 40 m Torr pressure, 950 W coil power, 90W platen power with an etch rate ${\sim}4{\mu}m$/min and via etch yield >90% over a 3-inch wafer, using $24{\mu}m$ thick photoresist mask. The etch uniformity and reproducibility obtained for the process were better than 4%. The metallized via-hole dc resistance measured was ${\sim}0.5{\Omega}$ and via inductance value measured was $\sim$83 pH.
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Ilangovan, A.,Muralidharan, S.,Maruthamuthu, S. Korean Chemical Society 2011 대한화학회지 Vol.55 No.6
A systematic study of Knoevenagel reaction and Nazarov cyclization was made on variety of less reactive carbonyl compounds such as ${\beta}$-ketoesters, 1,3-diketones and cyclic active methylene compounds using $Yb(OTf)_3$ as the catalyst. Recycling study confirms reusability of the catalyst without much loss of activity.
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A study on mechanical properties of concrete including activated recycled plastic waste
Ashok, M.,Jayabalan, P.,Saraswathy, V.,Muralidharan, S. Techno-Press 2020 Advances in concrete construction Vol.9 No.2
This paper describes the experimental studies carried out to determine the properties of fresh and hardened concrete with Recycled Plastic Waste (RPW) as a partial replacement material for fine aggregates. In the experimental study, RPW was used for replacing river sand and manufactured sand (M sand) aggregates in concrete. The replacement level of fine aggregates was ranging from 5% to 20% by volume with an increment of 5%. M40 grade of concrete with water cement ratio of 0.40 was used in this study. Two different types of RPW were used, and they are (i) un-activated RPW and (ii) activated RPW. The activated RPW was obtained by alkali activation of un-activated RPW using NaOH solution. The hardened properties of the concrete determined were dry density, compressive strength, split tensile strength, flexural strength and ultrasonic pulse velocity (UPV). The properties of the concrete with river sand, M sand, activated RPW and un-activated RPW were compared and inferences were drawn. The effect of activation using NaOH solution was investigated using FT-IR study. The micro structural examination of hardened concrete was carried out using Scanning Electron Microscopy (SEM). The test results show that the strength of concrete with activated RPW was more than that of un-activated RPW. From the results, it is evident that it is feasible to use 5% un-activated RPW and 15% activated RPW as fine aggregates for making concrete without affecting the strength properties.
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