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635 results on '"Sukumar R"'

1. Memristor based object detection using neural network

Author

Ravikumar KI and Sukumar R

Subjects
Memristor, Deep learning, Object detection, CIFAR-10, Electronic computers. Computer science, QA75.5-76.95
Abstract

With the increasing growth of AI, big data analytics, cloud computing, and Internet of Things applications, developing memristor devices and related hardware systems to compute the deep learning application needs extensive data calculations with low power consumption and lesser chip area. Deep learning model is one of the AI methods which is gaining importance in object detection, natural language processing, and pattern recognition. A large amount of data handling is essential for driving the deep learning model with less power consumption. To address these issues, the paper proposed the Memristor-based object detection on the CIFAR-10 dataset and achieved an accuracy of 85 percent. The memtorch package in python is employed to predict the objects for implementation.

Published
2022
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15. Impact of Climate Change on Forests in India

Author

Ravindranath, N. H., Joshi, N. V., Sukumar, R., and Saxena, A.

Subjects
Quantitative Biology - Other Quantitative Biology
Abstract

Global assessments have shown that future climate change is likely to significantly impact forest ecosystems. The present study makes an assessment of the impact of projected climate change on forest ecosystems in India. This assessment is based on climate projections of Regional Climate Model of the Hadley Centre (HadRM3) using the A2 (740 ppm CO2) and B2 (575 ppm CO2) scenarios of Special Report on Emissions Scenarios and the BIOME4 vegetation response model. The main conclusion is that under the climate projection for the year 2085, 77% and 68% of the forested grids in India are likely to experience shift in forest types under A2 and B2 scenario, respectively. Indications are a shift towards wetter forest types in the northeastern region and drier forest types in the northwestern region in the absence of human influence. Increasing atmospheric CO2 concentration and climate warming could also result in a doubling of net primary productivity under the A2 scenario and nearly 70% increase under the B2 scenario. The trends of impacts could be considered as robust but the magnitudes should be viewed with caution, due to the uncertainty in climate projections. Given the projected trends of likely impacts of climate change on forest ecosystems, it is important to incorporate climate change consideration in forest sector long-term planning process., Comment: 12 pages, 3 figures, 3 tables. Manuscript Submitted to Current Science

Published
2005

16. Tropical rainforest bird community structure in relation to altitude, tree species composition, and null models in the Western Ghats, India

Author

Raman, T. R. Shankar, Joshi, N. V., and Sukumar, R.

Subjects
Quantitative Biology - Populations and Evolution
Abstract

Studies of species distributions on elevational gradients are essential to understand principles of community organisation as well as to conserve species in montane regions. This study examined the patterns of species richness, abundance, composition, range sizes, and distribution of rainforest birds at 14 sites along an elevational gradient (500-1400 m) in the Kalakad-Mundanthurai Tiger Reserve (KMTR) of the Western Ghats, India. In contrast to theoretical expectation, resident bird species richness did not change significantly with elevation although the species composition changed substantially (<10% similarity) between the lowest and highest elevation sites. Constancy in species richness was possibly due to relative constancy in productivity and lack of elevational trends in vegetation structure. Elevational range size of birds, expected to increase with elevation according to Rapoport's rule, was found to show a contrasting inverse U-shaped pattern because species with narrow elevational distributions, including endemics, occurred at both ends of the gradient (below 800 m and above 1,200 m). Bird species composition also did not vary randomly along the gradient as assessed using a hierarchy of null models of community assembly, from completely unconstrained models to ones with species richness and range-size distribution restrictions. Instead, bird community composition was significantly correlated with elevation and tree species composition of sites, indicating the influence of deterministic factors on bird community structure. Conservation of low- and high-elevation areas and maintenance of tree species composition against habitat alteration are important for bird conservation in the southern Western Ghats rainforests., Comment: 36 pages, 5 figures, two tables (including one in the appendix) Submitted to the Journal of the Bombay Natural History Society (JBNHS)

Published
2005

19. Global and Local Conservation Priorities [with Response]

Author

Dinerstein, Eric, Scarano, F. R., Chaudhary, Pashupati, Mittermeier, Russell A., Gascon, Claude, Rajaobelina, Leon, Supriatna, Jatna, Silva, Jose Maria Cardoso Da, Rodriguez, Carlos Manuel, Zhi, Lu, Brandon, Katrina, Rodríguez, J. P., Taber, A. B., Daszak, P., Sukumar, R., Valladares-Padua, C., Padua, S., Aguirre, L. F., Medellín, R. A., Acosta, M., Aguirre, A. A., Bonacic, C., Bordino, P., Bruschini, J., Buchori, D., González, S., Mathew, T., Méndez, M., Mugica, L., Dobson, A. P., and Pearl, M.

Published
2007

25. Spatial Patterns in the Distribution of Tropical Tree Species

Author

Condit, Richard, Ashton, Peter S., Baker, Patrick, Bunyavejchewin, Sarayudh, Gunatilleke, Savithri, Gunatilleke, Nimal, Hubbell, Stephen P., Foster, Robin B., Itoh, Akira, LaFrankie, James V., Lee, Hua Seng, Losos, Elizabeth, Manokaran, N., Sukumar, R., and Yamakura, Takuo

Published
2000

31. In-situ sub-angstrom characterization of laser-lubricant interaction in a thermo-tribological system

Author

Qilong Cheng, Sukumar Rajauria, Erhard Schreck, Robert Smith, Qing Dai, and David B. Bogy

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

Abstract Laser-lubricant interaction has been a critical reliability issue in a thermo-tribological system named heat-assisted magnetic recording, one of the next generation hard disk drive solutions to increasing data storage. The lubricant response under laser irradiation and the subsequent lubricant recovery are crucial to the system’s reliability and longevity, however, they cannot be diagnosed locally and timely so far. Here, we propose a thermal scheme to in-situ characterize the mechanical laser-lubricant interaction. The nanometer-thick lubricant has a thermal barrier effect on the near-field thermal transport in the system, according to which the lubricant thickness can be determined. As demonstrations, this paper reports the first quantitative in-situ measurements of the laser-induced lubricant depletion and the subsequent reflow dynamics. The proposed scheme shows a sub-angstrom resolution (~0.2 Å) and a fast response time within seconds, rendering in-situ real-time lubricant diagnosis feasible in the practical hard disk drive products.

Published
2024
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36. Multispecies coexistence of trees in tropical forests: spatial signals of topographic niche differentiation increase with environmental heterogeneity

Author

Brown, C., Burslem, D. F. R. P., Illian, J. B., Bao, L., Brockelman, W., Cao, M., Chang, L. W., Dattaraja, H. S., Davies, S., Gunatilleke, C. V. S., Gunatilleke, I. A. U. N., Huang, J., Kassim, A. R., LaFrankie, J. V., Lian, J., Lin, L., Ma, K., Mi, X., Nathalang, A., Noor, S., Ong, P., Sukumar, R., Su, S. H., Sun, I. F., Suresh, H. S., Tan, S., Thompson, J., Uriarte, M., Valencia, R., Yap, S. L., Ye, W., and Law, R.

Published
2013
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37. Terrestrial and Freshwater Ecosystems and Their Services

Author

Singh, Bettina, Parmesan, C, Morecroft, MD, Trisurat, Y, Adrian, R, Anshari, GZ, Arneth, A, Gao, Q, Gonzalez, P, Harris, R, Price, J, Stevens, N, Talukdar, GH, Strutz, SE, Ackerly, DD, Anderson, E, Boyd, P, Birkmann, J, Bremerich, V, Brotons, L, Buotte, P, Campbell, D, Castellanos, E, Chen, Y-Y, Cissé, G, Cooley, S, Cowie, A, Dhimal, M, Domisch, S, Donner, S, Douwes, Errol, Escobar, LE, Rivera Ferre, M, Flecker, A, Foden, W, Gallagher, RV, Gaxiola, A, Gemeda, A, Goulding, M, Grey, K-A, López Gunn, E, Harrison, S, Hicke, J, Hilmi, NJM, Barragan-Jason, G, Keith, DA, Bezner Kerr, R, Kraemer, BM, Langhans, S, Lasco, R, Latimer, A, Lempert, R, Lluch-Cota, SE, Loisel, J, Mackey, J, Martinetto, P, Matthews, R, McPhearson, T, Mauritzen, M, Midgley, G, Mordecai, E, Moreira, F, Mukherji, A, Myers-Smith, I, Nabuurs, G-J, Neufeldt, H, Pearce-Higgins, J, Pecl, G, Pedace, R, Townsend Peterson, A, Piepenburg, D, Postigo, JC, Pulhin, J, Racault, M-F, Rocklöv, J, Rogelj, J, Rost, B, Romanello, M, Gallego-Sala, A, Schmidt, D, Schoeman, D, Seddon, N, Semenza, JC, Singer, MC, Singh, PK, Slingsby, J, Smith, P, Sukumar, R, Tirado, MC, Trisos, C, Turetsky, M, Turner, B, van Aalst, M, Young, K, Singh, Bettina, Parmesan, C, Morecroft, MD, Trisurat, Y, Adrian, R, Anshari, GZ, Arneth, A, Gao, Q, Gonzalez, P, Harris, R, Price, J, Stevens, N, Talukdar, GH, Strutz, SE, Ackerly, DD, Anderson, E, Boyd, P, Birkmann, J, Bremerich, V, Brotons, L, Buotte, P, Campbell, D, Castellanos, E, Chen, Y-Y, Cissé, G, Cooley, S, Cowie, A, Dhimal, M, Domisch, S, Donner, S, Douwes, Errol, Escobar, LE, Rivera Ferre, M, Flecker, A, Foden, W, Gallagher, RV, Gaxiola, A, Gemeda, A, Goulding, M, Grey, K-A, López Gunn, E, Harrison, S, Hicke, J, Hilmi, NJM, Barragan-Jason, G, Keith, DA, Bezner Kerr, R, Kraemer, BM, Langhans, S, Lasco, R, Latimer, A, Lempert, R, Lluch-Cota, SE, Loisel, J, Mackey, J, Martinetto, P, Matthews, R, McPhearson, T, Mauritzen, M, Midgley, G, Mordecai, E, Moreira, F, Mukherji, A, Myers-Smith, I, Nabuurs, G-J, Neufeldt, H, Pearce-Higgins, J, Pecl, G, Pedace, R, Townsend Peterson, A, Piepenburg, D, Postigo, JC, Pulhin, J, Racault, M-F, Rocklöv, J, Rogelj, J, Rost, B, Romanello, M, Gallego-Sala, A, Schmidt, D, Schoeman, D, Seddon, N, Semenza, JC, Singer, MC, Singh, PK, Slingsby, J, Smith, P, Sukumar, R, Tirado, MC, Trisos, C, Turetsky, M, Turner, B, van Aalst, M, and Young, K

Published
2022

38. Point of Departure and Key Concepts (Chapter 1)

Author

Pörtner, H.-O., Roberts, D.C., Tignor, M., Poloczanska, E.S., Mintenbeck, K, Alegría, A., Craig, M., Langsdorf, S., Löschke, S., Möller, V., Okem, A., Rama, B., Ara Begum, R., Lempert, E., Ali, E., Benjaminsen, T.A., Bernauer, T., Cramer, W., Cui, X., Mach, K., Nagy, G., Stenseth, N.C., Sukumar, R., Wester, P., Pörtner, H.-O., Roberts, D.C., Tignor, M., Poloczanska, E.S., Mintenbeck, K, Alegría, A., Craig, M., Langsdorf, S., Löschke, S., Möller, V., Okem, A., Rama, B., Ara Begum, R., Lempert, E., Ali, E., Benjaminsen, T.A., Bernauer, T., Cramer, W., Cui, X., Mach, K., Nagy, G., Stenseth, N.C., Sukumar, R., and Wester, P.

Abstract

The IPCC Working Group II contribution to the Sixth Assessment Report addresses the challenges of climate action in the context of sustainable development with a particular focus on climate change impacts, adaptation and vulnerability. This chapter frames the point of departure and key concepts building on the IPCC’s Fifth Assessment Report (IPCC, 2014a, b), the Special Report on Global Warming of 1.5°C (IPCC, 2018b), the Special Report on the Ocean and Cryosphere in a Changing Climate (SROCC) (IPCC, 2019b), and the Special Report on Climate Change and Land (SRCCL) (IPCC, 2019a); as well as the WGI contributions to the Sixth Assessment Report (IPCC, 2021a) and complements the contribution of the WGIII Sixth Assessment Report, which will be published after this report (IPCC, 2022).

Published
2022

44. Dispersion effect of Al2O3 nanoparticles in diesel and hemp biodiesel blend on the engine parameters of a diesel engine.

Author

Elipey, Manoj Kumar, Praveen, Anchupogu, Kondaiah, V. V., Dumpala, Ravikumar, Sunil, B. Ratna, and Sukumar, R. Sam

Subjects
DIESEL motors, DIESEL fuels, ALUMINUM oxide, THERMAL efficiency, HEMP, DISPERSION (Chemistry)
Abstract

Nano-alumina (Al2O3) particles were dispersed in Hemp biodiesel (HBD) blended with diesel fuel with varying fractions, and the engine characteristics were investigated. The brake thermal efficiency (BTE) was enhanced when the brake power was increased for tested fuels. Added nano-Al2O3 increased the BTE for both diesel and HBD25 fuel as the nanoparticles improve the combustion quality due to high surface area. BSFC was diminished by 8.5% for diesel+50ppm of Al2O3 fuel and 9.8% for HBD25+50ppm of Al2O3 fuel than the diesel and HBD25 fuels, respectively. CO emission for the HBD25 fuel was reduced by up to 18% than diesel and further decreased by the dispersion of alumina NPs. The maximum HC emissions were observed for diesel than HBD25 fuel and can be reduced with the addition of nano-particles. Further, a slight improvement in the NOx emissions was noted for diesel+50AN and HBD25+50AN fuels than diesel and HBD25 fuels. The results indicate better engine performance with enhanced combustion behavior of nano-Al2O3 dispersed Hemp biodiesel (HBD)–diesel blend with reduced emission. [ABSTRACT FROM AUTHOR]

Published
2022
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47. Towards higher-order accuracy on arbitrary grids

Author

Venkatakrishnan, V., Chakravarthy, Sukumar R., Araki, H., editor, Brézin, E., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Jaffe, R. L., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, Lehr, Sabine, editor, Kutler, Paul, editor, Flores, Jolen, editor, and Chattot, Jean-Jacques, editor

Published
1997
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49. Globalization of Conservation: A View from the South

Author

Rodríguez, J. P., Taber, A. B., Daszak, P., Sukumar, R., Valladares-Padua, C., Padua, S., Aguirre, L. F., Medellín, R. A., Acosta, M., Aguirre, A. A., Bonacic, C., Bordino, P., Bruschini, J., Buchori, D., González, S., Mathew, T., Méndez, M., Mugica, L., Pacheco, L. F., Dobson, A. P., and Pearl, M.

Published
2007
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50. Environmental Monitoring Network for India

Author

Sundareshwar, P. V., Murtugudde, R., Srinivasan, G., Singh, S., Ramesh, K. J., Ramesh, R., Verma, S. B., Agarwal, D., Baldocchi, D., Baru, C. K., Baruah, K. K., Chowdhury, G. R., Dadhwal, V. K., Dutt, C. B. S., Fuentes, J., Gupta, Prabhat K., Hargrove, W. W., Howard, M., Jha, C. S., Lal, S., Michener, W. K., Mitra, A. P., Morris, J. T., Myneni, R. R., Naja, M., Nemani, R., Purvaja, R., Raha, S., Vanan, S. K. Santhana, Sharma, M., Subramaniam, A., Sukumar, R., Twilley, R. R., and Zimmerman, P. R.

Published
2007
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