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Security Analysis of Vehicular Ad Hoc Networks (VANETs) : A Comprehensive Study
Nirbhay Kumar Chaubey 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.5
Vehicular Ad-hoc Networks (VANETs) is a technology that has been recently emerged, and brings a lot of research interests. Security is one of the important issues in VANET, it is considered a critical point in the development of robust VANET applications. In this paper, various dimensions of VANETs including its emerging applications, security issues, challenges, security threats and the existing solutions proposed by the different researchers are studied. Also author reviewed various type of VANET simulator available and presented possible key research area of VANETs.
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Bhaskar Ganguly,Nirbhay Kumar,Abul H. Ahmad,Sunil K. Rastogi 고려인삼학회 2018 Journal of Ginseng Research Vol.42 No.4
Background: Roots of Withania somnifera (WS) are a celebrated medicinal ingredient in Ayurvedic and many other indigenous systems of medicine. The present study investigates the effect of the phytochemical composition of the extracts on their antioxidant and reducing activities. Methods: WS roots were extracted with water, acetone, aqueous methanol (1:1), and methanol:- chloroform:water (1:1:1) to obtain aqueous, acetone, hydro-methanolic, and methanolechloroformewater extracts. Thereafter, phytochemical constitution and antioxidant and reducing activities of the extractswere compared using different qualitative and quantitative tests. Results: Maximum extraction recovery was obtained with 50% aqueous methanol whereas extraction with acetone yielded the poorest recovery. Methanolechloroformewater extract had the highest content of phytochemical constituents, except tannins, and also exhibited the highest antioxidant and reducing activities. Conclusion: Phytochemical composition and antioxidant and reducing activities of the extracts were positively associated with the use of organic solvents during the extraction process. Alkaloids and flavonoids were the most important contributors in the antioxidant and reducing activities of the extracts.
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Ganguly, Bhaskar,Kumar, Nirbhay,Ahmad, Abul H.,Rastogi, Sunil K. The Korean Society of Ginseng 2018 Journal of Ginseng Research Vol.42 No.4
Background: Roots of Withania somnifera (WS) are a celebrated medicinal ingredient in Ayurvedic and many other indigenous systems of medicine. The present study investigates the effect of the phytochemical composition of the extracts on their antioxidant and reducing activities. Methods: WS roots were extracted with water, acetone, aqueous methanol (1:1), and methanol:-chloroform:water (1:1:1) to obtain aqueous, acetone, hydro-methanolic, and methanol-chloroform-water extracts. Thereafter, phytochemical constitution and antioxidant and reducing activities of the extracts were compared using different qualitative and quantitative tests. Results: Maximum extraction recovery was obtained with 50% aqueous methanol whereas extraction with acetone yielded the poorest recovery. Methanol-chloroform-water extract had the highest content of phytochemical constituents, except tannins, and also exhibited the highest antioxidant and reducing activities. Conclusion: Phytochemical composition and antioxidant and reducing activities of the extracts were positively associated with the use of organic solvents during the extraction process. Alkaloids and flavonoids were the most important contributors in the antioxidant and reducing activities of the extracts.
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