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RISS 인기검색어
- 검색키워드
- 저자 : Preeti Chaturvedi (검색결과 5 건)
- 무료
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Building Mobile Agents’ Applications Fault Tolerant
Preeti,Praveena Chaturvedi 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.5
A mobile agent is self-governing software that has one or more goals and can migrate from one node to another in a network. Mobile agent has received pervasive interest in both research and academia in recent years because of its support for asynchronous and disconnected operation capability in distributed system Along with these affirmative sides, the full scale adoption of mobile agent has been delayed by several fault tolerance complexities in untrustworthy network environments such as Internet. This paper proposed a framework to provide fault tolerant execution to mobile agents. Key concepts used to accomplish this goal include the transaction manager concept, checkpointing, timeout mechanism. Agent saves partial results at home server. The framework can tolerate agent failure, server failure and communication delay. It has been implemented as an add-on to mobile agent platform called Aglets. Experiments have been conducted to test the feasibility and performance of the proposal.
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Arijit Dutta Gupta,Balendu Shekher Giri,Eldon R Rene,Preeti Chaturvedi,Mandavi Goswami,Harinder Singh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
As(III) presence in low concentration (1-5 mg/L) in water presents a challenging problem in its removal. In the present study, biochar prepared by the pyrolysis of mustard cake and loaded with Fe-Mn binary oxides through hydrothermal technique was used for adsorptive removal of As(III) from water in batch and continuous modes. The synthesised biochar exhibited mesoporous structures in the range of 2-50 nm (based on BET analysis). The maximum adsorption capacity (95.7 mg/g) obtained using biochar loaded with both Fe-Mn oxides was found to be 1.4 times higher than that of pristine biochar. The adsorption equilibria was best described by Freundlich isotherm (based on R² and χ²) suggesting that the As(III) adsorption was multilayered. The external mass transfer coefficients (βL = 10<SUP>-5</SUP> cm²/s) were observed to be higher than the film (Df = 10<SUP>-7</SUP> – 10<SUP>-9</SUP> cm²/s) and intraparticle (Di = 10<SUP>-9</SUP> cm²/s) diffusivities in batch mode. In column studies, Thomas model gave the best correlation coefficient (R² > 0.95) and the adsorption was limited by external mass transfer. Kinetic rate constant decreased with increase in initial As(III) concentration and flow rate. The oxide loaded biochar exhibited reusability up to three times for As(III) removal.
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Arijit Dutta Gupta,Balendu Shekher Giri,Eldon R Rene,Preeti Chaturvedi,Mandavi Goswami,Harinder Singh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
As(III) presence in low concentration (1–5 mg/L) in water presents a challenging problem in its removal. In the present study, biochar prepared by the pyrolysis of mustard cake and loaded with Fe-Mn binary oxides through hydrothermal technique was used for adsorptive removal of As(III) from water in batch and continuous modes. The synthesised biochar exhibited mesoporous structures in the range of 2–50 nm (based on BET analysis). The maximum adsorption capacity (95.7 mg/g) obtained using biochar loaded with both Fe-Mn oxides was found to be 1.4 times higher than that of pristine biochar. The adsorption equilibria was best described by Freundlich isotherm (based on R2 and χ2) suggesting that the As(III) adsorption was multilayered. The external mass transfer coefficients (βL = 10−5 cm2/s) were observed to be higher than the film (Df = 10−7 – 10−9 cm2/s) and intraparticle (Di = 10−9 cm2/s) diffusivities in batch mode. In column studies, Thomas model gave the best correlation coefficient (R2 > 0.95) and the adsorption was limited by external mass transfer. Kinetic rate constant decreased with increase in initial As(III) concentration and flow rate. The oxide loaded biochar exhibited reusability up to three times for As(III) removal.
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Progress in bioremediation of pesticide residues in the environment
Balendu Shekher Giri,Sachin Geed,Kumar Vikrant,Sang Soo Lee,Ki-Hyun Kim,Suresh Kumar Kailasa,Meththika Vithanage,Preeti Chaturvedi,Birendra Nath Rai,Ram Sharan Singh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
The increasing use of various pesticides (e.g., organophosphate, organochlorine, carbamates, and pyrethroid) has helped to improve agricultural productivity by minimizing the potential crop losses associated with insect attacks. Owing to their highly recalcitrant nature, most pesticides and their residues often accumulate in the environment to exert deleterious effects on human health and various ecosystems. Among a variety of remediation options, biological approaches have attracted a widespread attention for the treatment of pesticide in soil/water systems due to their environmentally benign nature. In this regard, this review article was organized to highlight the recent advancements in the application of various bioremediation approaches for the degradation/removal of pesticides from soil/water matrixes along with the catabolic capacity of microorganisms. Our discussions were expanded further to emphasize identification of specific bacterial communities/strains, such as Bacillus sp. and Pseudomonas sp. This review is expected to provide an overview of the modern biotechnological methodologies along with the associated merits and hurdles for the effective abatement of pesticides.
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Progress in bioremediation of pesticide residues in the environment
Balendu Shekher Giri,Sachin Geed,Kumar Vikrant,이상수,김기현,Suresh Kumar Kailasa,Meththika Vithanage,Preeti Chaturvedi,Birendra Nath Rai,Ram Sharan Singh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
The increasing use of various pesticides (e.g., organophosphate, organochlorine, carbamates, and pyrethroid) has helped to improve agricultural productivity by minimizing the potential crop losses associated with insect attacks. Owing to their highly recalcitrant nature, most pesticides and their residues often accumulate in the environment to exert deleterious effects on human health and various ecosystems. Among a variety of remediation options, biological approaches have attracted a widespread attention for the treatment of pesticide in soil/water systems due to their environmentally benign nature. In this regard, this review article was organized to highlight the recent advancements in the application of various bioremediation approaches for the degradation/removal of pesticides from soil/water matrixes along with the catabolic capacity of microorganisms. Our discussions were expanded further to emphasize identification of specific bacterial communities/strains, such as Bacillus sp. and Pseudomonas sp. This review is expected to provide an overview of the modern biotechnological methodologies along with the associated merits and hurdles for the effective abatement of pesticides.
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