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International Journal of Automation and computing 2021年第1期18卷 110-123页

作者： Sumi Phukan chitralekha mahanta Department of Electronics and Electrical Engineering Indian Institute of Technology GuwahatiGuwahati 781039India

In this study,a simple position synchronization control algorithm based on an integral sliding mode is developed for dualarm robotic manipulator systems.A first-order sliding surface is designed using cross-coupling error in order to ensure position synchronization of dual-arm *** design objective of the proposed controller is to ensure stability as well as to synchronize the movement of both arms while maintaining the trajectory as *** integral sliding mode eliminates the reaching phase and guarantees robustness throughout the whole operating ***,a low pass filter is used to smoothen the discontinuous element and minimize unwanted *** stability theory is utilized to prove the asymptotic stability of the controlled *** studies are performed to validate the proposed controller′s ***,to investigate the possibility of realizing the proposed dynamic control method in practical applications,experiments are conducted on a 14DoF coordinated links(COOL)dual-arm robotic manipulator *** evidence indicates adequate efficiency in trajectory tracking and guarantees robustness in the presence of parametric uncertainty and external disturbance.

关键词： Integral sliding mode control position synchronization dual-arm robotic manipulator chattering robust control

Adaptive integral higher order sliding mode controller for uncertain systems

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控制理论与应用（英文版） 2013年第1期11卷 61-68页

作者： Sanjoy MONDAL chitralekha mahanta Department of Electronics and Electrical Engineering Indian Institute of Technology Guwahati

This paper proposes an adaptive integral higher order sliding mode （HOSM） controller for uncertain sys- tems. Instead of a regular control input, the derivative of the control input is used in the proposed control law. The discon- tinuous sign function in the controller is made to act on the time derivative of the control input. The actual control signal obtained by integrating the derivative control signal is smooth and chattering free. The adaptive tuning law used in the proposed controller eliminates the need of prior knowledge about the upper bound of the system uncertainties. Stability and robustness of the proposed controller are proved by using the classical Lyapunov criterion. Simulation results demonstrate the advantages of the proposed control scheme.

关键词： Higher order sliding mode Adaptive tuning Integral sliding mode Uncertain systems Chattering

Auto-tuning of FOPI Controllers for TITO Processes with Experimental Validation

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International Journal of Automation and computing 2019年第5期16卷 589-603页

作者： Gargi Baruah Somanath Majhi chitralekha mahanta Department of Electronics and Electrical Engineering Indian Institute of Technology Guwahati

In this paper, the auto-tuning of a fractional order proportional and integral(FOPI) controller is proposed and experimentally validated for two-input two-output(TITO) processes. The proposed method first identifies an unknown TITO plant into fractional order TITO model with time delay. Furthermore, decoupling the TITO process into two fractional order single-input single-output(SISO) transfer function models makes it easier for designing the decentralized FOPI controllers. The proposed control method is a generalization of both integer order and fractional order TITO systems depending on the value of the order of the model. One advantage of this method is the non-requirement of a-priori information of gain and phase crossover frequencies of the system while tuning the controllers. The proposed algorithm is validated both by simulation of a class of TITO process models as well as by experimental analysis of a coupled tank system(CTS).

关键词： Auto-tuning fractional order proportional and integral (FOPI) two-input two-output (TITO) robust relay with hysteresis model reduction coupled tank system(CTS)

Design of FOPI Controller for Time Delay Systems and Its Experimental Validation

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International Journal of Automation and computing 2019年第3期16卷 310-328页

作者： Gargi Baruah Somanath Majhi chitralekha mahanta Department of Electronics and Electrical Engineering Indian Institute of Technology Guwahati

In this paper,we report on the identification and modeling of unknown and higher order processes into first order plus dead time(FOPDT)plants based on the limit cycle information obtained from a single relay feedback test with an online fractional order proportional integral(FOPI)*** parameters of the test processes are accurately determined by the state space method while the FOPI controller settings are re-tuned to achieve enhanced performance based on the identified model parameters based on the balancedtuning method.A new performance index,integral time fractional order absolute error(ITFIAE)is introduced in this paper for balanced tuning of fractional order(FO)*** requires minimum design specifications without a-priori knowledge of gain and phase crossover frequencies and is done non-iteratively without disrupting the closed *** test processes and experimental analysis on a coupled tank system(CTS)validate the theory proposed.

关键词： Auto-tuning fractional order proportional integral(FOPI) first order plus dead time(FOPDT) balanced tuning coupled tank system(CTS).

Optimal Bidding Strategies of Microgrid with Demand Side Management for Economic Emission Dispatch Incorporating Uncertainty and Outage of Renewable Energy Sources

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Energy Engineering 2024年第4期121卷 849-867页

作者： Mousumi Basu chitralekha Jena Baseem Khan Ahmed Ali Department of Power Engineering Jadavpur UniversityJadavpurIndia School of Electrical Engineering KIIT UniversityBhubaneswarIndia Department of Electrical and Computer Engineering Hawassa UniversityHawassaEthiopia Department of Electrical and Electronic Engineering Technology Faculty of Engineering and the Built EnvironmentUniversity of JohannesburgJohannesburgSouth Africa

In the restructured electricity market,microgrid(MG),with the incorporation of smart grid technologies,distributed energy resources(DERs),a pumped-storage-hydraulic(PSH)unit,and a demand response program(DRP),is a smarter and more reliable electricity *** consists of gas turbines and renewable energy sources such as photovoltaic systems and wind *** bidding strategies,prepared by MG operators,decrease the electricity cost and emissions from upstream grid and conventional and renewable energy sources(RES).But it is inefficient due to the very high sporadic characteristics of RES and the very high outage *** solve these issues,this study suggests non-dominated sorting genetic algorithm Ⅱ(NSGA-Ⅱ)for an optimal bidding strategy considering pumped hydroelectric energy storage and DRP based on outage conditions and uncertainties of renewable energy *** uncertainty related to solar and wind units is modeled using lognormal and Weibull probability ***-based DRP is used,especially considering the time of outages along with the time of peak loads and prices,to enhance the reliability of MG and reduce costs and emissions.

关键词： Micro-grid distributed energy resources demand response program uncertainty outage

Biofilm-forming fluconazole-resistant Candida auris causing vulvovaginal candidiasis in an immunocompetent patient: A case report

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Asian Pacific Journal of Tropical Medicine 2021年第2期14卷 94-96页

作者： Lakshmi Krishnasamy Jayasankari Senthilganesh chitralekha Saikumar Paramasivam Nithyanand Department of Microbiology Sree Balaji Medical College and HospitalChennai-600044Bharath Institute of Higher Education and ResearchIndia Biofilm Biology Laboratory Centre for Research on Infectious Diseases(CRID)School of Chemical and BiotechnologySASTRA Deemed UniversityTirumalaisamudramThanjavur 613401Tamil NaduIndia

Rationale:Candida auris is a potential emerging pathogen among Candida and causes serious health threats *** concerns:We reported a case of vulvovaginal candidiasis caused by Candida auris.A 26-year-old female presented with complaints of vaginal discharge,itching and low back ***:High vaginal swab culture yielded *** strain was confirmed as Candida auris by amplification and sequencing the internal transcribed spacer *** susceptibility testing revealed that the isolate was resistant to fluconazole,amphotericin B and clotrimazole and susceptible to ketoconazole and *** isolate also exhibited biofilm forming ***:Her symptoms did not subside with initial management with fluconazole and ***,she was started on ketoconazole *** patient responded well to *** and lessons:To the best of our knowledge,this is the first report about the presence of a drug resistant biofilm forming Candida auris strain isolated from a vaginal swab sample from Chennai *** forming ability might contribute to its drug *** acid analysis helps in rapid and accurate identification of such rare species.

关键词： Candida auris Resistance Biofilm Scanning electron microscopy

Automatic Evaluation of Test Strips for Anti-Ganglioside Antibodies in Patients with Guillain-BarréSyndrome Using EUROLineScan Software

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Advances in Microbiology 2014年第13期4卷 890-898页

作者： Chetana Vaishnavi chitralekha Behura Sudesh Prabhakar Departments of Gastroenterology and Neurology Postgraduate Institute of Medical Education and Research Chandigarh India

Campylobacter jejuni infection has been implicated in the pathogenesis of Guillain-Barré syndrome (GBS) due to production of humoral immune response against neural antigens. A case-control study was performed in a tertiary care teaching hospital for the estimation of anti-ganglioside antibodies in GBS patients and their controls. Blood samples were collected from 59 GBS cases, 58 neurological controls (NC) and 60 non-neurological control (NNC) patients for automatic estimation of IgG and IgM antibodies to seven gangliosides using EUROLineScan software. Antibodies of IgG class for GM1 were highly significant in GBS (p = 0.000) and NC (p = 0.031) compared to NNC. However GBS group was not significant (p = 0.413) compared to NC. For GM2 ganglioside, GBS and NC groups were significant (p = 0.000) compared to NNC, but GBS group was not significant (p = 0.999) compared to NC. For GM3 ganglioside, GBS and NC groups were significant (p = 0.000) compared to NNC;but GBS group was insignificant (p = 0.858) compared to NC with similar trend for all other ganglioside antibodies. When IgM class of antibodies was evaluated for GM1, GBS group was not significant (p = 0.604) whereas NC group was significant (p = 0.000) compared to NNC. GBS group was not significant compared to NC (p = 0.011). The trend was the same for GM2 antibodies. For GM3, GBS group was significant (p = 0.010) and NC was near significant (p = 0.055) compared to NNC. However GBS group was not significant (p = 0.808) compared to NC. No groups were significant (p > 0.05) in relation to the remaining gangliosides except for GQ1b where GBS group (p = 0.001) and NC group were significant (p = 0.000) compared to NNC. GBS group was also significant (p = 0.001) compared to NC and NNC. Anti-gangliosides antibodies were present in highly significant levels in the GBS group, though they were also present in the non-paralytic neurological control patients compared to the non-neurological control group.

关键词： Anti-Ganglioside Antibodies C. Jejuni Guillain-Barré Syndrome

Effect of EXAFS on the dosimetric related parameters

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Natural Science 2011年第5期3卷 414-418页

作者： chitralekha Alur Sharanabasappa Patil Manjunath Apparao Basavaraj Kerur 不详

Mass attenuation coefficients have been meas-ured for rare earth compounds at photon energies 8.041, 8.907 and 13.347 keV. The measured values are compared with theoretical calculations. The agreement between experiment and theory is more than the experimental error when the incident photon energy is around the edge of the element present in the compound and agreeing with the theoretical values elsewhere. The difference in agreement between the theoretical values and experimental values is attributed to the EXAFS effects on the mass attenuation coefficient values.

关键词： Mass Attenuation Coefficient Near Absorption Edge Cross Section Resonance Raman Scattering EXAFS

Paraoxonase activity in type 2 diabetes mellitus patients with and without complications

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海南医学院学报 2010年第8期16卷 992-994页

作者： Renuka Suvarna Soumya S Rao chitralekha Joshi Vivekananda Kedage Manjunatha S Muttigi Mungli Prakash Department of Biochemistry Kasturba Medical CollegeManipal

Objective:Type 2 diabetes mellitus(DM)is a disease of metabolic *** study was undertaken to know the relation between fasting lipid profile and paraoxonase 1(PON1)activity in type 2 diabetic patients with and without ***:The study group consisted of a total of 155 subjects which included non-diabetic healthy control subjects(n = 50)and diabetic patients with complications(group I,n = 66)and without complications(group II,n=39).PON1 activity was measured all the subjects based on spectrophotometric methods,and fasting lipid profile and fasting plasma glucose(FPG)levels were determined in clinical chemistry analyzer Hitachi ***:FPG(P<0.001)and TAG(P<0.001)significantly increased,and HDL-C(P<0.001)and PON1(P<0.001)were significantly decreased in group I patients when compared to normal *** group II patients FPG(P<0.001),TAG(P<0.001)and TC(P<0.05)significantly increased and HDL-C(P<0.05)was significantly decreased when compared to normal *** Pearson correlation,HDL-C was positively correlated with PON1 in group I patients(r=0.317,P<0.01).Conclusion:type 2 DM patients with complications have significantly decreased HDL-C levels and PON1 activity possibly indicating its decreased biochemical role in these patients.

关键词：糖尿病代谢疾病血糖活性

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葡萄球菌肠毒素A单克隆抗体的制造

微生物学免疫学进展 1986年第2期 26-28页

作者： chitralekha Edwin ,张伦

葡萄球菌属食物中毒是一种主要的公害,美国细菌引起的食物中毒占第二位。人们用特异抗体、通常是兔抗血清进行血清学反应来检测葡萄球菌肠毒素A、B、C、D、E(以下简称SEA、B、C、D、E)。检测这些葡萄球菌肠毒素最普通的方法包括使用微... 详细信息

葡萄球菌属食物中毒是一种主要的公害,美国细菌引起的食物中毒占第二位。人们用特异抗体、通常是兔抗血清进行血清学反应来检测葡萄球菌肠毒素A、B、C、D、E(以下简称SEA、B、C、D、E)。检测这些葡萄球菌肠毒素最普通的方法包括使用微量凝胶扩散系统。自从这一检测系统建立以来,人们成功地使之用于食物中毒病例。

关键词：单克隆抗体单抗特异性葡萄球菌肠毒素完全福氏佐剂光密度值缓冲液 ELISA 骨髓瘤细胞培养液 SEA PBS 阳性反应