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RISS 인기검색어
- 검색키워드
- 저자 : Somnath Singh (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Performance of a Wireless Sensor Network MAC Protocol with a Global Sleep Schedule
Somnath Ghosh,Prakash Veeraraghavan,Samar Singh,Lei Zhang 보안공학연구지원센터 2009 International Journal of Multimedia and Ubiquitous Vol.4 No.2
Medium access control protocols for wireless sensor networks are almost always designed to be energy efficient. One mechanism used to reduce energy expenditure is to periodically turn off the radio receivers of the sensor nodes in a coordinated manner. The nodes with radio receivers turned off are said to be in the sleep mode. Nodes form virtual clusters based on common sleep schedules. However, protocols like the widely used S-MAC may require some nodes to follow multiple sleep schedules causing them to wake up more often than the other nodes. This paper demonstrates in some wireless sensor networks using S-MAC, a significant proportion of the nodes may have to stay awake much longer than envisaged. A modification of the protocol is then proposed to eliminate the need for some nodes to stay awake longer than the other nodes. The modified version improves the energy efficiency and increases the life span of a wireless sensor network. The paper concludes with the result of simulation studies which indicate that the use of the proposed protocol is expected to increase the life time of wireless sensor networks significantly.
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Arresting an Unusual Amide Tautomer Using Divalent Cations
Kashid, Somnath M.,Singh, Reman K.,Kwon, Hyejin,Kim, Yung Sam,Mukherjee, Arnab,Bagchi, Sayan American Chemical Society 2019 The Journal of physical chemistry B Vol.123 No.40
<P>Ion-specific effects on peptides and proteins are key to biomolecular structure and stability. The subtle roles of the cations are far less understood, compared to the pronounced effects of the anions on proteins. Most importantly, divalent cations such as Ca<SUP>2+</SUP> and Mg<SUP>2+</SUP> are crucial to several biological functions. Herein, we demonstrate that an amide-iminolate equilibrium is triggered by the binding of the divalent cations to the amide oxygen in aqueous solution. The excellent agreement between the experimental and theoretical results confirms the arrest of an unusual amide tautomer by the divalent cations, which is a rarely known phenomenon that might open up an array of applications in chemistry and biology.</P> [FIG OMISSION]</BR>
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Folk to functional: An explorative overview of rice-based fermented foods and beverages in India
Mousumi Ray,Kuntal Ghosh,Somnath Singh,Keshab Chandra Mondal 한국식품연구원 2016 Journal of Ethnic Foods Vol.3 No.1
Fermented foods share an integral part of age-old wisdom from ancient Indian civilization. Over the generations, this pioneering practice of food fermentation has expanded and improved to preserve and fortify the available food resources, particularly to meet the hidden hunger. India, being the second largest producer of rice, has a great history of traditional rice-based fermented foods with different tastes and textures linked with cultural diversity and mostly prepared by rural women following village art techniques. Some of them have been scientifically investigated and it has been revealed that microflora in natural or starter culture plays imperative roles to bio-embolden the rice with varieties of health promoting macronutrients and micronutrients, phytochemicals, and other functional components during fermentation. In this review, some explorative information on traditional rice-based foods and beverages has been assembled to illustrate the global interest in Indian food heritage and their functional aspects. The review also deals with the preparation of raw materials, traditional processing, composition, and ethno-medicinal importance of each food to encourage entrepreneurs to develop large-scale production to meet the growing market demand of functional foods.
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