Academic literature on the topic 'Resource partitioning'

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Journal articles on the topic "Resource partitioning"

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Ferrant, Coline. "Resource Partitioning Theory." Administración y Organizaciones 24, no. 46 (August 5, 2021): 107–15. http://dx.doi.org/10.24275/uam/xoc/dcsh/rayo/2021v24n46/ferrant.

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Walter, G. H. "What is resource partitioning?" Journal of Theoretical Biology 150, no. 2 (May 1991): 137–43. http://dx.doi.org/10.1016/s0022-5193(05)80327-3.

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Hertz, P. E. "Evaluating thermal resource partitioning." Oecologia 90, no. 1 (April 1992): 127–36. http://dx.doi.org/10.1007/bf00317818.

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Liu, Huiqun, Kai Zhu, and D. F. Wong. "FPGA Partitioning with Complex Resource Constraints." VLSI Design 11, no. 3 (January 1, 2000): 219–35. http://dx.doi.org/10.1155/2000/12198.

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In this paper, we present an algorithm for circuit partitioning with complex resource constraints in large FPGAs. Traditional partitioning methods estimate the capacity of an FPGA device by counting the number of logic blocks, however this is not accurate with the increasing diverse resource types in the new FPGA architectures. We first propose a network flow based method to optimally check whether a circuit or a subcircuit is feasible for a set of available heterogeneous resources. Then the feasibility checking procedure is integrated in the FM-based algorithm for circuit partitioning. Incremental flow technique is employed for efficient implementation. Experimental results on the MCNC benchmark circuits show that our partitioning algorithm not only yields good results, but also is efficient. Our algorithm for partitioning with complex resource constraints is applicable for both multiple FPGA designs (e.g., logic emulation systems) and partitioning-based placement algorithms for a single large hierarchical FPGA (e.g., Actel's ES6500 FPGA family).
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Yang, Maolin, Wen-Hung Huang, and Jian-Jia Chen. "Resource-Oriented Partitioning for Multiprocessor Systems with Shared Resources." IEEE Transactions on Computers 68, no. 6 (June 1, 2019): 882–98. http://dx.doi.org/10.1109/tc.2018.2889985.

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Okasha, Ahmed. "Resource Partitioning and Hospital Specialization." Journal of Health Management 21, no. 3 (September 2019): 337–50. http://dx.doi.org/10.1177/0972063419868543.

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Background: Organizational scholars have been debating over specialism and generalism, and which environment is better for specialists and for generalists. Methods: This study relies heavily on the work of Okasha (Okasha, 1995, Modeling the determinants of hospital services differentiation and specialization (Dissertation). Virginia Commonwealth University, Richmond) and enhances it with available current literature on the topic. Okasha’s ( Modeling the determinants of hospital services differentiation and specialization (Dissertation). Virginia Commonwealth University, Richmond) study tested the use of resource partitioning theory to explain the conversion of generalists to specialists under competitive environments. Results: The anticipated effect of buyers of care on hospital specialization was evident. Recent work on specialization (Eastaugh, 2014, Journal of Healthcare Finance) confirmed the trend. Conclusion: Buyer-related factors and organizational factors were the most important predictors of the positive change in hospital specialization between 1987 and 1993. High competition, the increased pressure from buyers of care, and organizational factors were the most important predictors of the positive change in the hospital specialization measures during that time period.
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Chandra, A., and K. Chakrabarty. "Test resource partitioning for SOCs." IEEE Design & Test of Computers 18, no. 5 (2001): 80–91. http://dx.doi.org/10.1109/54.953275.

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Carroll, Glenn R., Stanislav D. Dobrev, and Anand Swaminathan. "Organizational processes of resource partitioning." Research in Organizational Behavior 24 (January 2002): 1–40. http://dx.doi.org/10.1016/s0191-3085(02)24002-2.

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Malescio, G. "Broad distributions from resource partitioning." Physica A: Statistical Mechanics and its Applications 383, no. 2 (September 2007): 643–50. http://dx.doi.org/10.1016/j.physa.2007.05.016.

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Piet, G. J., J. S. Pet, WAHP Guruge, J. Vijverberg, and WLT Van Densen. "Resource partitioning along three niche dimensions in a size-structured tropical fish assemblage." Canadian Journal of Fisheries and Aquatic Sciences 56, no. 7 (July 1, 1999): 1241–54. http://dx.doi.org/10.1139/f99-033.

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In Tissawewa, a tropical reservoir, the size-specific resource use of the 10 most important fish species was determined along three dimensions: trophic, spatial, and temporal. During this study, a drought occurred distinguishing two periods before and after the drought that differed markedly in availability of resources and fish biomass. In this study, differences in resource use between the two periods are presented together with their consequence on the partitioning of resources. A different approach is introduced into the calculation of niche breadth and niche overlap incorporating size-specific differences in resource use and interactions between resource dimensions. Comparison with conventional measures of niche breadth and niche overlap shows that conventional measures often misrepresent interactions between species. Condition and biomass were used as indicators of a species' fitness, and it is shown that fitness of most species is governed by the availability of resources and partitioning of these resources is an important mechanism allowing potential competitors to coexist. Resource partitioning along the trophic dimension was more important than along the spatial or temporal dimension.
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Dissertations / Theses on the topic "Resource partitioning"

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Botha, Jonathan Aubrey. "Resource partitioning in the world’s largest gannetry." Thesis, Nelson Mandela Metropolitan University, 2017. http://hdl.handle.net/10948/14707.

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Understanding strategies of resource partitioning within populations is a fundamental aspect of the study of ecology, and one which has been well documented across various taxa. In seabirds, sex-specific differences in foraging behaviour are often thought to reflect strategies of resource partitioning to avoid intra-specific competition. At present Bird Island in Algoa Bay hosts the world’s largest breeding population of gannets, with recent population estimates numbering well over 90 000 breeding pairs. Given the large size of this colony, intense levels of intra-specific competition are expected during the breeding season, particularly in years of poor feeding conditions. In addition, continuous foraging around the breeding colony may lead to the local depletion of prey as the season progresses, calling for flexibility in the foraging behaviour and diet of breeding individuals. Therefore, the aim of this dissertation was to investigate resource partitioning in Cape gannets breeding at Bird Island through strategies of sex-specific foraging and intra-seasonal variability in foraging behaviour and diet. To achieve this, the spatial and temporal aspects of Cape gannet foraging behaviour were assessed during the early stages of chick rearing, over two consecutive breeding seasons (2011/12, 2012/13) using GPS tracking and VHF monitoring. In addition, intra-seasonal variability in foraging behaviour and diet were investigated, taking into account the influence of sex and chick age, to provide a comprehensive assessment of foraging behaviour throughout the chick rearing period. GPS tracking data for 79 birds revealed limited evidence for sex-specific differences over spatial dimensions. An extension in the foraging range of females during a year of lower prey availability (2012/13) was, however, evident. This suggests a possible sex-specific response to prey limitation, likely reflecting resource partitioning strategies or differences in nutritional requirements. VHF data for 95 additional birds revealed a clear pattern in temporal foraging behaviour. In general, females were more likely to be on a foraging trip during the early and mid-day hours, with the probability of males being on a foraging trip increasing towards the late afternoon. Continuous tracking of individuals throughout the 2015/16 breeding season further revealed little evidence for sex-specific differences in spatial distribution and forging effort during both the guard and post-guard stages of chick rearing. A clear increase in foraging range was evident during the early stages of chick rearing as the season progressed. However, birds attending chicks older than 50 days showed an unexpected contraction in foraging range, which appeared to coincide with a dietary shift. During the early stages of breeding the diet was comprised almost exclusively of anchovy, the proportion of which decreased progressively in the diet throughout the breeding season. This was mirrored by a substantial increase in the proportion of saury in the diet. These results suggest that Cape gannets increase their foraging range in response to local prey depletion as the breeding season progresses. However, when alternative prey becomes available they may shift their diet, allowing them to access prey closer to the breeding colony. Overall, this dissertation provides insight into sex-specific behaviour in a monomorphic seabird, suggesting a marginal degree of spatial segregation. The results provide the first support for sex-related temporal foraging segregation in gannets. Such separation could potentially be driven by resource partitioning, but could also relate to differential nutritional requirements. In addition, this study also provided the first comprehensive assessment of foraging behaviour throughout the guard and post guard stages of chick rearing in gannets. These results suggest that a combination of foraging and dietary flexibility may allow Cape gannets to buffer the effects of prey depletion during the breeding season. In conclusion, resource partitioning through sex-specific foraging appears to be limited in the Cape gannet population at Bird Island. Segregation via alternative pathways may however be possible and as such, future studies should consider the influence of individual level segregation and habitat specialization.
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Riordan, Philip. "Spatial and resource partitioning in mammalian carnivore assemblages." Thesis, Manchester Metropolitan University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392983.

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Barlow, Katherine Elisabeth. "Resource partitioning between two cryptic species of Pipistrellus." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361107.

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Robl, Nicholas. "Ontogenetic resource partitioning in white-faced sakis (Pithecia pithecia)." Kent State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=kent1228418482.

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Robl, Nick. "Ontogenetic resource partitioning in white-faced sakis (Pithecia pithecia)." [Kent, Ohio] : Kent State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1228418482.

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Thesis (M.A.)--Kent State University, 2008.
Title from PDF t.p. (viewed Jan. 21, 2010). Advisor: Marilyn Norconk. Keywords: Ontogeneny; white-faced saki; resource partitioning; intraspecific; mechanical properties; feeding ecology; pithecia. Includes bibliographical references (p. 70-80).
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Boucek, Ross E. "Resource Partitioning Among Three Mesoconsumers at a Marsh Mangrove Ecotone: a Response to a Seasonal Resource Pulse Subsidy." FIU Digital Commons, 2011. http://digitalcommons.fiu.edu/etd/541.

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Pulse subsidies account for a substantial proportion of resource availability in many systems, having persistent and cascading effects on consumer population dynamics, and the routing of energy within and across ecosystem boundaries. Although the importance of resource pulses is well-established, consumer responses and the extent of resource partitioning is not well understood. I identified a pulse of marsh cyprinodontoid, invertebrate, and sunfish prey, entering an estuary, which was met by an influx of both marsh and estuarine predators. In response to the pulse, consumers showed marked diet segregation. Bass consumed significantly more cyprinodontoids, bowfin consumed significantly more invertebrates, and snook almost exclusively targeted sunfishes. The diversity of the resource pulse subsidizes multiple consumers, routing pulsed production through various trophic pathways and across ecosystem boundaries. Preserving complex trophic linkages like those of the Everglades ecotone may be important to maintaining ecosystem function and the provisioning of services, such as recreational fisheries.
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Aki, Hazar. "Resource Allocation Methodologies with Fractional Reuse Partitioning in Cellular Networks." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/2979.

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Conventional cellular systems have not taken full advantage of fractional frequency reuse and adaptive allocation due to the fixed cluster size and uniformed channel assignment procedures. This problem may cause more fatal consequences considering the cutting-edge 4G standards which have higher data rate requirements such as 3GPP-LTE and IEEE 802.16m (WiMAX). In this thesis, three different partitioning schemes for adaptive clustering with fractional frequency reuse were proposed and investigated. An overlaid cellular clustering scheme which uses adaptive fractional frequency reuse factors would provide a better end-user experience by exploiting the high level of signal to interference ratio (SIR). The proposed methods are studied via simulations and the results show that the adaptive clustering with different partitioning methods provide better capacity and grade of service (GoS) comparing to the conventional cellular architecture methodologies.
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Musina, John. "Mechanisms of coexistence in nectar foraging bees : resource and temporal partitioning /." [Beersheba, Israel] : Ben-Gurion University of the Negev, 2009. http://aranne5.lib.ad.bgu.ac.il/others/MusinaJohn.pdf.

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Anwar, Ali. "Towards Efficient and Flexible Object Storage Using Resource and Functional Partitioning." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/83508.

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Modern storage systems are designed to manage data without considering the dynamicity of user or resource requirements. This design approach does not consider the complexities of the dynamically changing runtime application behaviors as well as the unique features of underlying resources. To this end, this dissertation studies how resource and functional partitioning strategies can improve efficiency and flexibility of object stores. This dissertation presents a series of practical and efficient techniques, algorithms, and optimizations to realize efficient and flexible object stores. The experimental evaluation demonstrates the effectiveness of our design choices and strategies to make object stores flexible and resource-aware.
Ph. D.
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Page, Brad. "Niche partitioning among fur seals /." Access full text, 2005. http://www.lib.latrobe.edu.au/thesis/public/adt-LTU20060622.153716/index.html.

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Thesis (Ph.D.) -- La Trobe University, 2005.
Submitted in total fulfilment of the requirements for the degree of Doctor of Philosophy to the Zoology Dept., School of Life Sciences, Faculty of Science, Technology and Engineering. Research. Includes bibliographical references (leaves 133-152). Also available via the World Wide Web.
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Books on the topic "Resource partitioning"

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Putman, Rory. Competition and resource partitioning in temperate ungulate assemblies. London: Chapman & Hall, 1996.

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Chakrabarty, Krishnendu. Test resource partitioning for system-on-a-chip. Boston: Kluwer Academic Publishers, 2002.

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Chakrabarty, Krishnendu. Test resource partitioning for system-on-a-chip. New York: Springer, 2002.

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Putman, Rory J. Competition and Resource Partitioning in Temperate Ungulate Assemblies. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1517-6.

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Chakrabarty, Krishnendu, Vikram Iyengar, and Anshuman Chandra. Test Resource Partitioning for System-on-a-Chip. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-1113-7.

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Nicol, David M. Dynamic remapping of parallel computations with varying resource demands. Hampton, Va: ICASE, 1986.

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Flint, R. Warren. Niche characterization of dominant estuarine benthic species. College Station, Tex: Sea Grant College Program, Texas A&M University, 1986.

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Auffenberg, Walter. Resource partitioning in a community of Philippine skinks (Sauria: Scincidae). Gainesville: University of Florida, 1988.

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Golovatin, M. G. Troficheskie otnoshenii͡a︡ vorobʹinykh ptit͡s︡ na severnoĭ granit͡s︡e rasprostranenii͡a︡ lesov. Ekaterinburg: Rossiĭskai͡a︡ akademii͡a︡ nauk, Uralʹskoe otd-nie, 1992.

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Nicol, David. On bottleneck partitioning k-ary n-cubes. Hampton, VA: Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1994.

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Book chapters on the topic "Resource partitioning"

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Leppla, Norman C., Bastiaan M. Drees, Allan T. Showler, John L. Capinera, Jorge E. Peña, Catharine M. Mannion, F. William Howard, et al. "Resource Partitioning." In Encyclopedia of Entomology, 3174. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6359-6_3365.

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Hill, John. "Resource Partitioning." In The British Newspaper Industry, 178–89. London: Palgrave Macmillan UK, 2016. http://dx.doi.org/10.1007/978-1-137-56897-7_19.

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Chakrabarty, Krishnendu, Vikram Iyengar, and Anshuman Chandra. "Test Resource Partitioning." In Test Resource Partitioning for System-on-a-Chip, 3–15. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-1113-7_1.

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Chakrabarty, Krishnendu, Vikram Iyengar, and Anshuman Chandra. "Improved Test Bus Partitioning." In Test Resource Partitioning for System-on-a-Chip, 45–64. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-1113-7_3.

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Putman, Rory J. "Factors structuring resource relationships in ungulate assemblies." In Competition and Resource Partitioning in Temperate Ungulate Assemblies, 108–16. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1517-6_7.

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Ebeling, Alfred W., and David R. Laur. "Foraging in surfperches: resource partitioning or individualistic responses?" In Contemporary studies on fish feeding: the proceedings of GUTSHOP ’84, 123–34. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-017-1158-6_10.

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de Figueiredo, Rodolfo Antônio, and Marlies Sazima. "Pollination Ecology and Resource Partitioning in Neotropical Pipers." In Piper: A Model Genus for Studies of Phytochemistry, Ecology, and Evolution, 33–57. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-0-387-30599-8_3.

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Tüfekçi, Volkan, and Can Özturan. "Partitioning Graph Databases by Using Access Patterns." In Adaptive Resource Management and Scheduling for Cloud Computing, 158–76. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-28448-4_12.

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Putman, Rory J. "Introduction." In Competition and Resource Partitioning in Temperate Ungulate Assemblies, 1–10. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1517-6_1.

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Putman, Rory J. "The New Forest and its larger herbivores." In Competition and Resource Partitioning in Temperate Ungulate Assemblies, 11–29. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1517-6_2.

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Conference papers on the topic "Resource partitioning"

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Bharucha, Zubin, Harald Haas, Gunther Auer, and Ivan Cosovic. "Femto-Cell Resource Partitioning." In 2009 IEEE Globecom Workshops. IEEE, 2009. http://dx.doi.org/10.1109/glocomw.2009.5360723.

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TeBlunthuis, Nathan, Aaron Shaw, and Benjamin Mako Hill. "Density Dependence Without Resource Partitioning." In CSCW '17: Computer Supported Cooperative Work and Social Computing. New York, NY, USA: ACM, 2017. http://dx.doi.org/10.1145/3022198.3026358.

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Cazorla, Francisco J., Jaume Abella, and Enrico Mezzetti. "Dissecting Robust Resource Partitioning, Robust Time Partitioning, and Robust Partitioning in CAST-32A." In Automotive Technical Papers. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2021. http://dx.doi.org/10.4271/2021-01-5101.

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Selvakkumaran, Navaratnasothie, Abhishek Ranjan, Salil Raje, and George Karypis. "Multi-resource aware partitioning algorithms for FPGAs with heterogeneous resources." In the 41st annual conference. New York, New York, USA: ACM Press, 2004. http://dx.doi.org/10.1145/996566.996768.

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Selvakkumaran, Navaratnasothie, Abhishek Ranjan, Salil Raje, and George Karypis. "Multi-resource aware partitioning algorithms for FPGAs with heterogeneous resources." In Proceeding of the 2004 ACM/SIGDA 12th international symposium. New York, New York, USA: ACM Press, 2004. http://dx.doi.org/10.1145/968280.968339.

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Zawish, Muhammad, Lizy Abraham, Kapal Dev, and Steven Davy. "Towards Resource-aware DNN Partitioning for Edge Devices with Heterogeneous Resources." In GLOBECOM 2022 - 2022 IEEE Global Communications Conference. IEEE, 2022. http://dx.doi.org/10.1109/globecom48099.2022.10000839.

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Singh, Kamal D., David Ros, Laurent Toutain, and Cesar Viho. "Proportional Resource Partitioning Over Shared Wireless Links." In 2007 IEEE 66th Vehicular Technology Conference. IEEE, 2007. http://dx.doi.org/10.1109/vetecf.2007.369.

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Shen, Yongming, Michael Ferdman, and Peter Milder. "Maximizing CNN Accelerator Efficiency Through Resource Partitioning." In ISCA '17: The 44th Annual International Symposium on Computer Architecture. New York, NY, USA: ACM, 2017. http://dx.doi.org/10.1145/3079856.3080221.

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Yiannopoulos, K., K. Kontodimas, K. Christodoulopoulos, and E. Varvarigos. "Resource partitioning in the NEPHELE datacentre interconnect." In 2017 19th International Conference on Transparent Optical Networks (ICTON). IEEE, 2017. http://dx.doi.org/10.1109/icton.2017.8024738.

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Chen, Weiwei, and Ewa Deelman. "Integration of Workflow Partitioning and Resource Provisioning." In 2012 12th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGrid). IEEE, 2012. http://dx.doi.org/10.1109/ccgrid.2012.57.

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Reports on the topic "Resource partitioning"

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Bull Evelyn L., Steven R. Peterson, and Jack Ward Thomas. Resource partitioning among woodpeckers in northeastern Oregon. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1986. http://dx.doi.org/10.2737/pnw-rn-444.

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Wolf, Shmuel, and William J. Lucas. Involvement of the TMV-MP in the Control of Carbon Metabolism and Partitioning in Transgenic Plants. United States Department of Agriculture, October 1999. http://dx.doi.org/10.32747/1999.7570560.bard.

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The function of the 30-kilodalton movement protein (MP) of tobacco mosaic virus (TMV) is to facilitate cell-to-cell movement of viral progeny in infected plants. Our earlier findings have indicated that this protein has a direct effect on plasmodesmal function. In addition, these studies demonstrated that constitutive expression of the TMV MP gene (under the control of the CaMV 35S promoter) in transgenic tobacco plants significantly affects carbon metabolism in source leaves and alters the biomass distribution between the various plant organs. The long-term goal of the proposed research was to better understand the factors controlling carbon translocation in plants. The specific objectives were: A) To introduce into tobacco and potato plants a virally-encoded (TMV-MP) gene that affects plasmodesmal functioning and photosynthate partitioning under tissue-specific promoters. B) To introduce into tobacco and potato plants the TMV-MP gene under the control of promoters which are tightly repressed by the Tn10-encoded Tet repressor, to enable the expression of the protein by external application of tetracycline. C) To explore the mechanism by which the TMV-MP interacts with the endogenous control o~ carbon allocation. Data obtained in our previous project together with the results of this current study established that the TMV-MP has pleiotropic effects when expressed in transgenic tobacco plants. In addition to its ability to increase the plasmodesmal size exclusion limit, it alters carbohydrate metabolism in source leaves and dry matter partitioning between the various plant organs, Expression of the TMV-MP in various tissues of transgenic potato plants indicated that sugars and starch levels in source leaves are reduced below those of control plants when the TMV-MP is expressed in green tissue only. However, when the TMV-MP was expressed predominantly in PP and CC, sugar and starch levels were raised above those of control plants. Perhaps the most significant result obtained from experiments performed on transgenic potato plants was the discovery that the influence of the TMV-MP on carbohydrate allocation within source leaves was under developmental control and was exerted only during tuber development. The complexity of the mode by which the TMV-MP exerts its effect on the process of carbohydrate allocation was further demonstrated when transgenic tobacco plants were subjected to environmental stresses such as drought stress and nutrients deficiencies, Collectively, these studies indicated that the influence of the TMV-MP on carbon allocation L the result of protein-protein interaction within the source tissue. Based on these results, together with the findings that plasmodesmata potentiate the cell-to-cell trafficking of viral and endogenous proteins and nucleoproteins complexes, we developed the theme that at the whole plant level, the phloem serves as an information superhighway. Such a long-distance communication system may utilize a new class of signaling molecules (proteins and/or RNA) to co-ordinate photosynthesis and carbon/nitrogen metabolism in source leaves with the complex growth requirements of the plant under the prevailing environmental conditions. The discovery that expression of viral MP in plants can induce precise changes in carbon metabolism and photoassimilate allocation, now provide a conceptual foundation for future studies aimed at elucidating the communication network responsible for integrating photosynthetic productivity with resource allocation at the whole-plant level. Such information will surely provide an understanding of how plants coordinate the essential physiological functions performed by distantly-separated organs. Identification of the proteins involved in mediating and controlling cell-to-cell transport, especially at the companion cell-sieve element boundary, will provide an important first step towards achieving this goal.
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Selvakkumaran, Navaratnasothie, Abhishek Ranjan, Salil Raje, and George Karypis. Scalable Partitioning Algorithms for FPGAs With Heterogeneous Resources. Fort Belvoir, VA: Defense Technical Information Center, September 2004. http://dx.doi.org/10.21236/ada439474.

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Silva, Mario, Tor Bjørnstad, and Sissel Opsahl Viig. Tracer-based interwell Sor-monitoring and evaluation of efficiency in EOR-methods. University of Stavanger, November 2021. http://dx.doi.org/10.31265/usps.207.

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A partitioning inter-well tracer test (PITT) determines the residual (or even remaining) oil saturation (SOR) in the flooded region between well-pairs. This type of tracer test can be used to identify improved oil recovery (IOR) targets, evaluate IOR projects, evaluate enhanced oil recovery (EOR) methods, and improve reservoir description for efficient hydrocarbon production. Thus, the main objective of the work with inter-well oil/water partitioning tracers developed within the framework of the IOR Centre is to provide tools and methodologies to improve reservoir description for efficient management of resources. The present report aims to provide insight to its users on the deployment of tracer technology in the inter- well region of water-flooded reservoirs to determine SOR. In turn, this parameter can be used as basis to evaluate the efficiency of several oil-production related operations. It will explain workflows, expertise, and tools needed as well as the importance of the information obtained, and methods to obtain it. This report is directed towards operators, primarily to reservoir engineers and reservoir managers, and service companies, particularly those already engaged on the deployment of tracer technology or those who aim to begin this activity. R&D personnel working in both operators and service companies may also benefit from the contents of the present report.
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5

Sela, Hanan, Eduard Akhunov, and Brian J. Steffenson. Population genomics, linkage disequilibrium and association mapping of stripe rust resistance genes in wild emmer wheat, Triticum turgidum ssp. dicoccoides. United States Department of Agriculture, January 2014. http://dx.doi.org/10.32747/2014.7598170.bard.

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The primary goals of this project were: (1) development of a genetically characterized association panel of wild emmer for high resolution analysis of the genetic basis of complex traits; (2) characterization and mapping of genes and QTL for seedling and adult plant resistance to stripe rust in wild emmer populations; (3) characterization of LD patterns along wild emmer chromosomes; (4) elucidation of the multi-locus genetic structure of wild emmer populations and its correlation with geo-climatic variables at the collection sites. Introduction In recent years, Stripe (yellow) rust (Yr) caused by Pucciniastriiformis f. sp. tritici(PST) has become a major threat to wheat crops in many parts of the world. New races have overcome most of the known resistances. It is essential, therefore, that the search for new genes will continue, followed by their mapping by molecular markers and introgression into the elite varieties by marker-assisted selection (MAS). The reservoir of genes for disease and pest resistance in wild emmer wheat (Triticumdicoccoides) is an important resource that must be made available to wheat breeders. The majority of resistance genes that were introgressed so far in cultivated wheat are resistance (R) genes. These genes, though confering near-immunity from the seedling stage, are often overcome by the pathogen in a short period after being deployed over vast production areas. On the other hand, adult-plant resistance (APR) is usually more durable since it is, in many cases, polygenic and confers partial resistance that may put less selective pressure on the pathogen. In this project, we have screened a collection of 480 wild emmer accessions originating from Israel for APR and seedling resistance to PST. Seedling resistance was tested against one Israeli and 3 North American PST isolates. APR was tested on accessions that did not have seedling resistance. The APR screen was conducted in two fields in Israel and in one field in the USA over 3 years for a total of 11 replicates. We have found about 20 accessions that have moderate stripe rust APR with infection type (IT<5), and about 20 additional accessions that have novel seedling resistance (IT<3). We have genotyped the collection using genotyping by sequencing (GBS) and the 90K SNP chip array. GBS yielded a total 341K SNP that were filtered to 150K informative SNP. The 90K assay resulted in 11K informative SNP. We have conducted a genome-wide association scan (GWAS) and found one significant locus on 6BL ( -log p >5). Two novel loci were found for seedling resistance. Further investigation of the 6BL locus and the effect of Yr36 showed that the 6BL locus and the Yr36 have additive effect and that the presence of favorable alleles of both loci results in reduction of 2 grades in the IT score. To identify alleles conferring adaption to extreme climatic conditions, we have associated the patterns of genomic variation in wild emmer with historic climate data from the accessions’ collection sites. The analysis of population stratification revealed four genetically distinct groups of wild emmer accessions coinciding with their geographic distribution. Partitioning of genomic variance showed that geographic location and climate together explain 43% of SNPs among emmer accessions with 19% of SNPs affected by climatic factors. The top three bioclimatic factors driving SNP distribution were temperature seasonality, precipitation seasonality, and isothermality. Association mapping approaches revealed 57 SNPs associated with these bio-climatic variables. Out of 21 unique genomic regions controlling heading date variation, 10 (~50%) overlapped with SNPs showing significant association with at least one of the three bioclimatic variables. This result suggests that a substantial part of the genomic variation associated with local adaptation in wild emmer is driven by selection acting on loci regulating flowering. Conclusions: Wild emmer can serve as a good source for novel APR and seedling R genes for stripe rust resistance. APR for stripe rust is a complex trait conferred by several loci that may have an additive effect. GWAS is feasible in the wild emmer population, however, its detection power is limited. A panel of wild emmer tagged with more than 150K SNP is available for further GWAS of important traits. The insights gained by the bioclimatic-gentic associations should be taken into consideration when planning conservation strategies.
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