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Journal articles on the topic 'Data migraton'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Yu, Zhou, George A. McMechan, Phil D. Anno, and John F. Ferguson. "Wavelet‐transform‐based prestack multiscale Kirchhoff migration." GEOPHYSICS 69, no. 6 (2004): 1505–12. http://dx.doi.org/10.1190/1.1836823.

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We propose a Kirchhoff‐style algorithm that migrates coefficients obtained by wavelet decomposition of seismic traces over time. Wavelet‐based prestack multiscale Kirchhoff migration involves four steps: wavelet decomposition of the seismic data, thresholding of the resulting wavelet coefficients, multiscale Kirchhoff migration, and image reconstruction from the multiscale images. The migration procedure applied to each wavelet scale is the same as conventional Kirchhoff migration but operates on wavelet coefficients. Since only the wavelet coefficients are migrated, the cost of wavelet‐based

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Liu, Xialin, Junsheng Wu, Gang Sha, and Shuqin Liu. "Virtual Machine Consolidation with Minimization of Migration Thrashing for Cloud Data Centers." Mathematical Problems in Engineering 2020 (August 3, 2020): 1–13. http://dx.doi.org/10.1155/2020/7848232.

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Cloud data centers consume huge amount of electrical energy bringing about in high operating costs and carbon dioxide emissions. Virtual machine (VM) consolidation utilizes live migration of virtual machines (VMs) to transfer a VM among physical servers in order to improve the utilization of resources and energy efficiency in cloud data centers. Most of the current VM consolidation approaches tend to aggressive-migrate for some types of applications such as large capacity application such as speech recognition, image processing, and decision support systems. These approaches generate a high mi

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Stolt, Robert H. "A prestack residual time migration operator." GEOPHYSICS 61, no. 2 (1996): 605–7. http://dx.doi.org/10.1190/1.1443987.

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Larner and Beasley (1987) present cascaded migration as a way to increase the power and effectiveness of relatively simple migration methods. In particular, f-k migration (Stolt, 1978) can be made to accommodate a depth‐dependent velocity as a cascade of constant‐velocity migrations. The core concept is that data which have been migrated with an approximate velocity can be effectively migrated to their true velocity by migrating with a velocity that is equal to the square root of the difference between the squares of the true and approximate velocities.

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Kadioglu, Aras, William Coward, M. Joseph Colston, Colin R. A. Hewitt, and Peter W. Andrew. "CD4-T-Lymphocyte Interactions with Pneumolysin and Pneumococci Suggest a Crucial Protective Role in the Host Response to Pneumococcal Infection." Infection and Immunity 72, no. 5 (2004): 2689–97. http://dx.doi.org/10.1128/iai.72.5.2689-2697.2004.

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ABSTRACT Previously, we had shown that T cells accumulated in peribronchiolar and perivascular areas of lungs soon after intranasal infection with Streptococcus pneumoniae. We have now presented new evidence, using major histocompatibility class II-deficient mice, that CD4 cells are important for early protective immunity. In addition, we have also shown that a population of human CD4 cells migrates towards pneumococci and that in vivo-passaged pneumococci are substantially more potent at inducing migration than in vitro-grown bacteria. This migratory process is unique to a specific population

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Berchtold, Adrienne, Ira Nightingale, Caitlin Vandermeer, and Scott A. MacDougall-Shackleton. "Experimental temperature manipulations alter songbird autumnal nocturnal migratory restlessness." Animal Migration 4, no. 1 (2017): 1–7. http://dx.doi.org/10.1515/ami-2017-0001.

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AbstractMigrating birds may respond to a variety of environmental cues in order to time migration. During the migration season nocturnally migrating songbirds may migrate or stop-over at their current location, and when migrating they may vary the rate or distance of migration on any given night. It has long been known that a variety of weather-related factors including wind speed and direction, and temperature, are correlated with migration in free-living birds, however these variables are often correlated with each other. In this study we experimentally manipulated temperature to determine i

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Mueller, Thomas, Robert B. O’Hara, Sarah J. Converse, Richard P. Urbanek, and William F. Fagan. "Social Learning of Migratory Performance." Science 341, no. 6149 (2013): 999–1002. http://dx.doi.org/10.1126/science.1237139.

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Successful bird migration can depend on individual learning, social learning, and innate navigation programs. Using 8 years of data on migrating whooping cranes, we were able to partition genetic and socially learned aspects of migration. Specifically, we analyzed data from a reintroduced population wherein all birds were captive bred and artificially trained by ultralight aircraft on their first lifetime migration. For subsequent migrations, in which birds fly individually or in groups but without ultralight escort, we found evidence of long-term social learning, but no effect of genetic rela

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Larner, Ken, and Craig Beasley. "Cascaded migrations: Improving the accuracy of finite‐difference migration." GEOPHYSICS 52, no. 5 (1987): 618–43. http://dx.doi.org/10.1190/1.1442331.

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The accuracy of time migrations done with finite‐difference schemes deteriorates with increasing reflector dip. Some properties of migration in general, and of finite‐difference approaches in particular, suggest a way of improving the accuracy of finite‐difference schemes for migrating steep dips. First, although data will be undermigrated when too low a velocity is used in migration, a correctly migrated result can be obtained by migrating again, this time with the previously undermigrated result as input. In fact, a sequence of undermigrations will yield the correct result as long as the sum

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Yilmaz, Ö. "Interpretive evaluation of migrated data." Exploration Geophysics 20, no. 2 (1989): 17. http://dx.doi.org/10.1071/eg989017.

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In practice, migration of seismic data requires decision making with regard to: (1) Different migration strategies ? 2-D/3-D, post-stack/prestack, and time/depth migrations; (2) different migration algorithms for a given strategy ? integral, finite-difference and frequency-wavenumber methods; (3) different parameters for a given algorithm ? aperture width, depth-step size, stretch factor; (4) the input data ? profile length, noise content, spatial aliasing and boundary effects; (5) and finally, migration velocities ? the weak link between the seismic method and the subsurface geology that the

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9

Fudickar, Adam M., and Ellen D. Ketterson. "Genomes to space stations: the need for the integrative study of migration for avian conservation." Biology Letters 14, no. 2 (2018): 20170741. http://dx.doi.org/10.1098/rsbl.2017.0741.

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Ongoing changes to global weather patterns and human modifications of the environment have altered the breeding and non-breeding ranges of migratory species, the timing of their migrations, and even whether they continue to migrate at all. Animal movements are arguably one of the most difficult behaviours to study, particularly in smaller birds that migrate tens to thousands of kilometres seasonally, often moving hundreds of kilometres each day. The recent miniaturization of tracking and logging devices has led to a radical transformation in our understanding of avian migratory behaviour and m

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Streich, Rita, Jan van der Kruk, and Alan G. Green. "Vector-migration of standard copolarized 3D GPR data." GEOPHYSICS 72, no. 5 (2007): J65—J75. http://dx.doi.org/10.1190/1.2766466.

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The derivation of ground-penetrating radar (GPR) images in which the amplitudes of reflections and diffractions are consistent with subsurface electromagnetic property contrasts requires migration algorithms that correctly account for the antenna radiation patterns and the vectorial character of electromagnetic wavefields. Most existing vector-migration techniques are based on far-field approximations of Green’s functions, which are inappropriate for the majority of GPR applications. We have recently developed a method for rapidly computing practically exact-field Green’s functions in a multic

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Nemeth, Tamas, Chengjun Wu, and Gerard T. Schuster. "Least‐squares migration of incomplete reflection data." GEOPHYSICS 64, no. 1 (1999): 208–21. http://dx.doi.org/10.1190/1.1444517.

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A least‐squares migration algorithm is presented that reduces the migration artifacts (i.e., recording footprint noise) arising from incomplete data. Instead of migrating data with the adjoint of the forward modeling operator, the normal equations are inverted by using a preconditioned linear conjugate gradient scheme that employs regularization. The modeling operator is constructed from an asymptotic acoustic integral equation, and its adjoint is the Kirchhoff migration operator. We tested the performance of the least‐squares migration on synthetic and field data in the cases of limited recor

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Satterfield, Dara A., John C. Maerz, and Sonia Altizer. "Loss of migratory behaviour increases infection risk for a butterfly host." Proceedings of the Royal Society B: Biological Sciences 282, no. 1801 (2015): 20141734. http://dx.doi.org/10.1098/rspb.2014.1734.

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Long-distance animal migrations have important consequences for infectious disease dynamics. In some cases, migration lowers pathogen transmission by removing infected individuals during strenuous journeys and allowing animals to periodically escape contaminated habitats. Human activities are now causing some migratory animals to travel shorter distances or form sedentary (non-migratory) populations. We focused on North American monarch butterflies and a specialist protozoan parasite to investigate how the loss of migratory behaviours affects pathogen spread and evolution. Each autumn, monarch

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Boyle, W. A. "Does food abundance explain altitudinal migration in a tropical frugivorous bird?" Canadian Journal of Zoology 88, no. 2 (2010): 204–13. http://dx.doi.org/10.1139/z09-133.

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Many animals undergo annual migrations. These movements are well studied at proximate levels, but their fundamental causes are poorly understood. Among tropical frugivorous birds, annual migration is thought to have evolved in the context of exploiting reciprocal peaks in fruit abundance among locations and seasons, yet previous tests of this hypothesis have yielded equivocal results. In this paper, I tested whether protein and (or) fruit limitation explain both uphill and downhill migratory movements in a tropical frugivorous bird, the White-ruffed Manakin ( Corapipo altera Hellmayer, 1906).

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Jonsson, B., M. Jonsson, and N. Jonsson. "Influences of migration phenology on survival are size-dependent in juvenile Atlantic salmon (Salmo salar)." Canadian Journal of Zoology 95, no. 8 (2017): 581–87. http://dx.doi.org/10.1139/cjz-2016-0136.

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Long-distance migratory species can reduce mortality risks by synchronizing the migration event and create confusion by swamping predators with high densities. To reduce confusion, predators are known to primarily select aberrant prey. We hypothesized that at the start of their sea sojourn, particularly small and large Atlantic salmon (Salmo salar L., 1758) would spread the risk by also migrating at other times of the year. Based on data from the Norwegian river Imsa between 1976 and 2015, we found that juveniles, 14–19 cm in total length, started their sea sojourn during a short period betwee

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Garel, S., M. Garcia-Dominguez, and P. Charnay. "Control of the migratory pathway of facial branchiomotor neurones." Development 127, no. 24 (2000): 5297–307. http://dx.doi.org/10.1242/dev.127.24.5297.

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Facial branchiomotor (fbm) neurones undergo a complex migration in the segmented mouse hindbrain. They are born in the basal plate of rhombomere (r) 4, migrate caudally through r5, and then dorsally and radially in r6. To study how migrating cells adapt to their changing environment and control their pathway, we have analysed this stereotyped migration in wild-type and mutant backgrounds. We show that during their migration, fbm neurones regulate the expression of genes encoding the cell membrane proteins TAG-1, Ret and cadherin 8. Specific combinations of these markers are associated with eac

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Brönmark, C., K. Hulthén, P. A. Nilsson, et al. "There and back again: migration in freshwater fishes." Canadian Journal of Zoology 92, no. 6 (2014): 467–79. http://dx.doi.org/10.1139/cjz-2012-0277.

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Animal migration is an amazing phenomenon that has fascinated humans for long. Many freshwater fishes also show remarkable migrations, whereof the spectacular mass migrations of salmonids from the spawning streams are the most well known and well studied. However, recent studies have shown that migration occurs in a range of freshwater fish taxa from many different habitats. In this review we focus on the causes and consequences of migration in freshwater fishes. We start with an introduction of concepts and categories of migration, and then address the evolutionary causes that drive individua

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Bounas, Anastasios, Michele Panuccio, Angelos Evangelidis, Konstantinos Sotiropoulos, and Christos Barboutis. "The Migration of the Lesser Kestrel Falco naumanni in Eastern Europe - A Ringing Recovery and Direct Observation Approach." Acrocephalus 37, no. 168-169 (2016): 49–56. http://dx.doi.org/10.1515/acro-2016-0002.

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Abstract We examined ringing recovery data of the Lesser Kestrel Falco naumanni in order to analyse its migration patterns and philopatry rates in Eastern Europe. In addition, we extracted counts of migrating birds from online databases and studied the use of the flyway as well as the phenology of both spring and autumn migrations through Greece. Birds appeared to migrate in the same mean direction in spring and autumn through the Italian and Balkan Peninsulas. During spring, movements took place on a broad front from March until mid- May with a peak in mid-April; in autumn, birds migrated thr

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Riosmena, Fernando, and Mao-Mei Liu. "Who Goes Next? The Gendered Expansion of Mexican and Senegalese Migrant Sibling Networks in Space and Time." ANNALS of the American Academy of Political and Social Science 684, no. 1 (2019): 146–64. http://dx.doi.org/10.1177/0002716219856544.

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The migration literature shows that individuals whose siblings have migrated abroad are more likely to migrate, yet we know little about sibling migrant networks. We use MMP and MAFE-Senegal survey data to compare migration patterns in two very disparate contexts (Mexico and Senegal) in an attempt to assess the scope, manner, and generalizability of sibling network migration patterns. Our results show that while Senegalese families are likely to have one international migrant, Mexican families are likely to send two or more members abroad. Sibling migrations from Mexico fall closer together in

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Hermance, John F. "Ground‐penetrating radar: Postmigration stacking of n-fold common midpoint profile data." GEOPHYSICS 66, no. 2 (2001): 379–88. http://dx.doi.org/10.1190/1.1444929.

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Diffraction and nonvertical side‐looking reflection patterns are typical features of most commercial ground‐penetrating radar (GPR) surveys. While a number of techniques are used by GPR workers to migrate such signals back to the proper position of the subsurface reflector, these have not been generally applied to multifold data nor to conditions of extreme noise. A procedure known among seismologists as wavefront migration is adapted here for processing multifold common midpoint (CMP) GPR data; it appears to be promising for both noise‐free and noisy data. The algorithm is largely geometrical

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Skov, Christian, Ben B. Chapman, Henrik Baktoft, et al. "Migration confers survival benefits against avian predators for partially migratory freshwater fish." Biology Letters 9, no. 2 (2013): 20121178. http://dx.doi.org/10.1098/rsbl.2012.1178.

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The importance of predation risk in shaping patterns of animal migration is not well studied, mostly owing to difficulties in accurately quantifying predation risk for migratory versus resident individuals. Here, we present data from an extensive field study, which shows that migration in a freshwater fish (roach, Rutilus rutilus ) that commonly migrates from lakes to streams during winter confers a significant survival benefit with respect to bird (cormorant, Phalacrocorax carbo spp.) predation. We tagged over 2000 individual fish in two Scandinavian lakes over 4 years and monitored migratory

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Thilagavathi, N., D. Divya Dharani, R. Sasilekha, Vasundhara Suruliandi, and V. Rhymend Uthariaraj. "Energy Efficient Load Balancing in Cloud Data Center Using Clustering Technique." International Journal of Intelligent Information Technologies 15, no. 1 (2019): 84–100. http://dx.doi.org/10.4018/ijiit.2019010104.

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Cloud computing has seen tremendous growth in recent days. As a result of this, there has been a great increase in the growth of data centers all over the world. These data centers consume a lot of energy, resulting in high operating costs. The imbalance in load distribution among the servers in the data center results in increased energy consumption. Server consolidation can be handled by migrating all virtual machines in those underutilized servers. Migration causes performance degradation of the job, based on the migration time and number of migrations. Considering these aspects, the propos

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Tiwari, Vijay Kumar. "Data Migration With Oracle DataPump Tool." International Journal of Trend in Scientific Research and Development Volume-2, Issue-3 (2018): 1767–68. http://dx.doi.org/10.31142/ijtsrd11557.

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Hobson, Keith A., Jackson W. Kusack та Blanca X. Mora-Alvarez. "Origins of Six Species of Butterflies Migrating through Northeastern Mexico: New Insights from Stable Isotope (δ2H) Analyses and a Call for Documenting Butterfly Migrations". Diversity 13, № 3 (2021): 102. http://dx.doi.org/10.3390/d13030102.

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Determining migratory connectivity within and among diverse taxa is crucial to their conservation. Insect migrations involve millions of individuals and are often spectacular. However, in general, virtually nothing is known about their structure. With anthropogenically induced global change, we risk losing most of these migrations before they are even described. We used stable hydrogen isotope (δ2H) measurements of wings of seven species of butterflies (Libytheana carinenta, Danaus gilippus, Phoebis sennae, Asterocampa leilia, Euptoieta claudia, Euptoieta hegesia, and Zerene cesonia) salvaged

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Maijenburg, Marijke W., Willy A. Noort, Marion Kleijer, et al. "Migration Potential of Human Mesenchymal Stromal Cells Is Determined by Origin of Tissue Rather Than Their Developmental Stage." Blood 112, no. 11 (2008): 4743. http://dx.doi.org/10.1182/blood.v112.11.4743.4743.

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Abstract It is thought that adult mesenchymal stromal cells (MSC) are important for tissue repair and maintenance. Crucial in these processes is the presence of MSC at the site of injury, however the recruitment and migration of MSC towards their destiny is poorly understood. With respect to future cell therapy, we are studying the process of migration of various human mesenchymal stem cell sources, and hypothesize that only a subpopulation of ex vivo expanded mesenchymal stem cells is capable of specific homing. For this purpose, MSC from different sources i.e. fetal lung (FL), fetal bone mar

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Liu, Zhaolun, Abdullah AlTheyab, Sherif M. Hanafy, and Gerard Schuster. "Imaging near-surface heterogeneities by natural migration of backscattered surface waves: Field data test." GEOPHYSICS 82, no. 3 (2017): S197—S205. http://dx.doi.org/10.1190/geo2016-0253.1.

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We have developed a methodology for detecting the presence of near-surface heterogeneities by naturally migrating backscattered surface waves in controlled-source data. The near-surface heterogeneities must be located within a depth of approximately one-third the dominant wavelength [Formula: see text] of the strong surface-wave arrivals. This natural migration method does not require knowledge of the near-surface phase-velocity distribution because it uses the recorded data to approximate the Green’s functions for migration. Prior to migration, the backscattered data are separated from the or

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Zheng, Yikang, Yibo Wang, and Xu Chang. "Least-squares data-to-data migration: An approach for migrating free-surface-related multiples." GEOPHYSICS 84, no. 2 (2019): S83—S94. http://dx.doi.org/10.1190/geo2018-0080.1.

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Free-surface-related multiples can provide extra illumination of the subsurface and thus can be usefully included in migration procedures. However, most multiple migration approaches require separation of primaries and free-surface-related multiples or at least prediction of multiples in advance, which is time consuming and prone to errors. The data-to-data migration (DDM) method migrates free-surface-related multiples by forward and backward propagating the recorded full data (containing primaries and free-surface-related multiples). For DDM, there is no need to predict or separate multiples,

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Hallworth, Michael T., Peter P. Marra, Kent P. McFarland, Sara Zahendra, and Colin E. Studds. "Tracking dragons: stable isotopes reveal the annual cycle of a long-distance migratory insect." Biology Letters 14, no. 12 (2018): 20180741. http://dx.doi.org/10.1098/rsbl.2018.0741.

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Insect migration is globally ubiquitous and can involve continental-scale movements and complex life histories. Apart from select species of migratory moths and butterflies, little is known about the structure of the annual cycle for migratory insects. Using stable-hydrogen isotope analysis of 852 wing samples from eight countries spanning 140 years, combined with 21 years of citizen science data, we determined the full annual cycle of a large migratory dragonfly, the common green darner ( Anax junius ). We demonstrate that darners undertake complex long-distance annual migrations governed lar

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Larsson, Stefan, Ignacio Serrano, and Lars-Ove Eriksson. "Effects of muscle lipid concentration on wild and hatchery brown trout (Salmo trutta) smolt migration." Canadian Journal of Fisheries and Aquatic Sciences 69, no. 1 (2012): 1–12. http://dx.doi.org/10.1139/f2011-128.

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Annually, hatchery programs are releasing millions of salmonid smolts into the Baltic Sea. Recent estimations indicate a decline in smolt sea survival, questioning the ecological and socioeconomic values of these programs. Concurrently, hatchery smolts have increased in lipid concentration. Salmonids display partial migration, and it is suggested that the ratio of migrants/residents is affected by individual smolt energetic status. To test whether the increased energetic status of hatchery smolts could explain the noted decrease in survival, we released wild trout smolts, conventional hatchery

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Aglas, F., J. Hermann, and G. Egger. "Abnormal directed migration of blood polymorphonuclear leukocytes in rheumatoid arthritis. Potential role in increased susceptibility to bacterial infections." Mediators of Inflammation 7, no. 1 (1998): 19–23. http://dx.doi.org/10.1080/09629359891333.

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Rheumatoid arthritis (RA) patients are at higher risks of bacterial infection than healthy subjects. Polymorphonuclear leukocytes (PMN) are the first line of nonspecific cellular defence against these infections. We tested the hypothesis that abnormal directed migration of PMN may be one reason for the increased infection rate of RA patients. PMN migration was investigated in 68 peripheral blood samples of 15 RA patients compared with 64 samples of healthy controls in a novel whole bloodin vitromembrane filter assay. The migration of PMNs from RA patients and controls was stimulated using the

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Grech, M. Graziella Kirtland, Don C. Lawton, and Scott Cheadle. "Integrated prestack depth migration of vertical seismic profile and surface seismic data from the Rocky Mountain Foothills of southern Alberta, Canada." GEOPHYSICS 68, no. 6 (2003): 1782–91. http://dx.doi.org/10.1190/1.1635031.

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We have developed an anisotropic prestack depth migration code that can migrate either vertical seismic profile (VSP) or surface seismic data. We use this migration code in a new method for integrated VSP and surface seismic depth imaging. Instead of splicing the VSP image into the section derived from surface seismic data, we use the same migration algorithm and a single velocity model to migrate both data sets to a common output grid. We then scale and sum the two images to yield one integrated depth‐migrated section. After testing this method on synthetic surface seismic and VSP data, we ap

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Bijolin Edwin, E., and M. Roshni Thanka. "Data Replication Strategies with Load Balancing and Data Migration in Cloud Data Center." Journal of Computational and Theoretical Nanoscience 17, no. 5 (2020): 2024–29. http://dx.doi.org/10.1166/jctn.2020.8843.

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The evolution of Information Systems implies new applications and the need to migrate the data from a previous application to a new one. At the same time, some organizations may need to replicate data from one technology to another one, in order to have backup systems and have a flexible load balanced strategies. The maximal uniform distribution of the load across closer and number of simpler nodes can help managing and providing the big data and large workloads which are more easy to handle. The ultimate goal is to balance the load through cloud and make internet less cloud defendant by havin

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Gray, Samuel H., and William P. May. "Kirchhoff migration using eikonal equation traveltimes." GEOPHYSICS 59, no. 5 (1994): 810–17. http://dx.doi.org/10.1190/1.1443639.

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The use of ray shooting followed by interpolation of traveltimes onto a regular grid is a popular and robust method for computing diffraction curves for Kirchhoff migration. An alternative to this method is to compute the traveltimes by directly solving the eikonal equation on a regular grid, without computing raypaths. Solving the eikonal equation on such a grid simplifies the problem of interpolating times onto the migration grid, but this method is not well defined at points where two different branches of the traveltime field meet. Also, computational and data storage issues that are relat

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Wu, W. J., L. Lines, A. Burton, et al. "Prestack depth migration of an Alberta Foothills data set—The Husky experience." GEOPHYSICS 63, no. 2 (1998): 392–98. http://dx.doi.org/10.1190/1.1444338.

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We produce depth images for an Alberta Foothills line by iteratively using a number of migration and velocity analysis techniques. In imaging steeply dipping layers of a foothills data set, it is apparent that thrust belt geology can violate the conventional assumptions of elevation datum corrections and common midpoint (CMP) stacking. To circumvent these problems, we use migration from topography in which we perform prestack depth migration on the data using correct source and receiver elevations. Migration from topography produces enhanced images of steep shallow reflectors when compared to

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Zhou, Changxi, Jing Chen, Gerard T. Schuster, and Brackin A. Smith. "A quasi‐Monte Carlo approach to efficient 3-D migration: Field data test." GEOPHYSICS 64, no. 5 (1999): 1562–72. http://dx.doi.org/10.1190/1.1444660.

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The quasi‐Monte Carlo migration algorithm is applied to a 3-D seismic data set from West Texas. The field data were finely sampled at approximately 220-ft (67-m) intervals in the in‐line direction but were sampled coarsely at approximately 1320-ft (402-m) intervals in the cross‐line direction. The traces at the quasi‐Monte Carlo points were obtained by an interpolation of the regularly sampled traces. The subsampled traces at the quasi‐Monte Carlo points were migrated, and the resulting images were compared to those obtained by migrating both regular and uniform grids of traces. Results show t

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Ibrahim, Muhammad, Muhammad Imran, Faisal Jamil, Yun-Jung Lee, and Do-Hyeun Kim. "EAMA: Efficient Adaptive Migration Algorithm for Cloud Data Centers (CDCs)." Symmetry 13, no. 4 (2021): 690. http://dx.doi.org/10.3390/sym13040690.

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The rapid demand for Cloud services resulted in the establishment of large-scale Cloud Data Centers (CDCs), which ultimately consume a large amount of energy. An enormous amount of energy consumption eventually leads to high operating costs and carbon emissions. To reduce energy consumption with efficient resource utilization, various dynamic Virtual Machine (VM) consolidation approaches (i.e., Predictive Anti-Correlated Placement Algorithm (PACPA), Resource-Utilization-Aware Energy Efficient (RUAEE), Memory-bound Pre-copy Live Migration (MPLM), m Mixed migration strategy, Memory/disk operatio

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Greenwood, Michael J. "Some Potential New Directions in Empirical Migration Research." SCIENZE REGIONALI, no. 1 (March 2010): 5–17. http://dx.doi.org/10.3280/scre2010-001001.

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This paper provides my thinking on several possible new directions in empirical migration research, as well as refinements of old directions. The focus is mainly on developed countries, but given the availability of appropriate data for less-developed countries, many of the studies could fruitfully be applied to such countries. The essay is organized around the six major questions addressed in studies of migration: (1) How many migrate? (2) Who migrates? (3) Why do they migrate? (4) Where do the migrants come from and where do they go? (5) When do they migrate? (6) What are the consequences of

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Morrison, Christie M., Colin P. Gallagher, Keith B. Tierney, and Kimberly L. Howland. "Freshwater early life growth influences partial migration in populations of Dolly Varden (Salvelinus malma malma)." Polar Biology 44, no. 7 (2021): 1353–64. http://dx.doi.org/10.1007/s00300-021-02870-z.

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AbstractPopulations of northern Dolly Varden (Salvelinus malma malma) exhibit partial seaward migration, yet little is known about this phenomenon in Dolly Varden populations. Our study analyzed data from three different Dolly Varden populations in the western Canadian Arctic in order to determine if: (1) differences in size-at-first seaward migration exist between fish that migrate at early and late ages among populations inhabiting different river systems, and (2) annual growth influences anadromous or resident life history choice. Otolith strontium analysis and back-calculation were used to

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Fuchs, Philip X., Mojca Doupona, Kinga Varga, et al. "Multi-national perceptions on challenges, opportunities, and support structures for Dual Career migrations in European student-athletes." PLOS ONE 16, no. 6 (2021): e0253333. http://dx.doi.org/10.1371/journal.pone.0253333.

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Despite Dual Careers (sports and education) and mobility of students being priorities in the funding policies of the European Commission, migrating student-athletes report severe challenges and decreased performance or dropouts at sport and academic levels. The objective of this study was to depict and assess the perceptions on challenges, support services, and their effectiveness in consideration of specific characteristics of participants and migrations. Based on a meta-synthesis and previous findings, a 50-items questionnaire was developed and completed by 245 student-athletes in 5 European

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Smith, Barry D., Gordon A. McFarlane, and Mark W. Saunders. "Inferring the Summer Distribution of Migratory Pacific Hake (Merluccius productus) from Latitudinal Variation in Mean Lengths-at-Age and Length Frequency Distributions." Canadian Journal of Fisheries and Aquatic Sciences 49, no. 4 (1992): 708–21. http://dx.doi.org/10.1139/f92-080.

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Average summer distribution of abundance and biomass for the migratory population of Pacific hake (Merluccius productus) is described by age, length, and latitude, based on a model proposing that (1) changes in mean length-at-age with latitude and (2) the nonnormal (skewed to the right) appearance of length-at-age distributions near southwest Vancouver Island could be caused by length-dependent migration velocities and changing migration velocity with latitude. Our model uses mean length-at-age data collected annually near four latitudes from California to Vancouver Island, length frequency da

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Sun, Yonghe, Gerard T. Schuster, and K. Sikorski. "A quasi‐Monte Carlo approach to 3-D migration: Theory." GEOPHYSICS 62, no. 3 (1997): 918–28. http://dx.doi.org/10.1190/1.1444199.

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A mathematical breakthrough was recently achieved in understanding the tractability of multidimensional integration using nearly optimal quasi‐Monte Carlo methods. Inspired by the new mathematical insights, we have studied the feasibility of applying quasi‐Monte Carlo methods to seismic imaging by 3-D prestack Kirchhoff migration. This earth imaging technique involves computing a large [Formula: see text] number of 3-D or 4-D integrals. Our numerical studies show that nearly optimal quasi‐Monte Carlo migration can produce the same or better quality earth images using only a small fraction (one

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Zhang, Hui, and Yong Liu. "Virtual Machine Migrating Algorithm Based on Genetic Algorithm in Cloud Data Center." Applied Mechanics and Materials 513-517 (February 2014): 2031–34. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.2031.

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Virtual machine migration is an effective method to improve the resource utilization of cloud data center. The common migration methods use heuristic algorithms to allocation virtual machines, the solution results is easy to fall into local optimal solution. Therefore, an algorithm called Migrating algorithm based on Genetic Algorithm (MGA) is introduced in this paper, which roots from genetic evolution theory to achieve global optimal search in the map of virtual machines to target nodes, and improves the objective function of Genetic Algorithm by setting the resource utilization of virtual m

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McMillan, M. N., C. Huveneers, J. M. Semmens, and B. M. Gillanders. "Partial female migration and cool-water migration pathways in an overfished shark." ICES Journal of Marine Science 76, no. 4 (2018): 1083–93. http://dx.doi.org/10.1093/icesjms/fsy181.

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Abstract Knowledge about reproductive movements can be of important conservation value for over-exploited species that are vulnerable when moving between and within key reproductive habitats. Lack of knowledge persists around such movements in the overfished school shark Galeorhinus galeus in Australia. Management assumes all pregnant females migrate between adult aggregations in the Great Australian Bight, South Australia, and nursery areas around Bass Strait and Tasmania. We tracked 14 late-term pregnant females tagged in South Australia using satellite-linked pop-up archival tags to investi

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Islam, Md Ariful, Ho Jin Choi, Raju Dash, et al. "N-Acetyl-d-Glucosamine Kinase Interacts with NudC and Lis1 in Dynein Motor Complex and Promotes Cell Migration." International Journal of Molecular Sciences 22, no. 1 (2020): 129. http://dx.doi.org/10.3390/ijms22010129.

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Recently, we showed that N-acetylglucosamine kinase (NAGK), an enzyme of amino sugar metabolism, interacts with dynein light chain roadblock type 1 (DYNLRB1) and promotes the functions of dynein motor. Here, we report that NAGK interacts with nuclear distribution protein C (NudC) and lissencephaly 1 (Lis1) in the dynein complex. Yeast two-hybrid assays, pull-down assays, immunocytochemistry, and proximity ligation assays revealed NAGK–NudC–Lis1–dynein complexes around nuclei, at the leading poles of migrating HEK293T cells, and at the tips of migratory processes of cultured rat neuroblast cell

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Biondi, Biondo, and Gopal Palacharla. "3-D prestack migration of common‐azimuth data." GEOPHYSICS 61, no. 6 (1996): 1822–32. http://dx.doi.org/10.1190/1.1444098.

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In principle, downward continuation of 3-D prestack data should be carried out in the 5-D space of full 3-D prestack geometry (recording time, source surface location, and receiver surface location), even when the data sets to be migrated have fewer dimensions, as in the case of common‐azimuth data sets that are only four dimensional. This increase in dimensionality of the computational space causes a severe increase in the amount of computations required for migrating the data. Unless this computational efficiency issue is solved, 3-D prestack migration methods based on downward continuation

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Whitcombe, David N., and Randall J. Carroll. "The application of map migration to 2-D migrated data." GEOPHYSICS 59, no. 7 (1994): 1121–32. http://dx.doi.org/10.1190/1.1443668.

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Two‐dimensional migrated time interpretations are used in a novel application of map migration. This is done by following the seismic migration along the 2-D lines by a map migration in a direction orthogonal to the lines, thus achieving a fully 3-D migrated representation of the subsurface. In addition to modifying the 2-D times and positions, this approach corrects the amplitudes of the 2-D migrated data, which suffer from being corrupted by focusing or defocusing because of the reflector curvature orthogonal to the line direction. A Gulf of Mexico case study illustrates how this map migrati

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Druzyaka, O. R., A. V. Druzyaka, M. A. Gulyaeva, F. Huettmann, and A. M. Shestopalov. "Modern application and prospects of the stable isotopes method for studying avian influenza A virus transmission in migratory birds." South of Russia: ecology, development 14, no. 3 (2019): 92–100. http://dx.doi.org/10.18470/1992-1098-2019-3-92-100.

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Aim. The circulation and transmission of pathogens is a global biological phenomenon that is closely associated with bird migration. This analysis was carried out with the aim of understanding and assessing the prospects of using the stable isotope method to study the circulation and transmission of the avian influenza A virus via migratory birds. Discussion. Insufficient data on the distances of migration of infected birds and their interpopulational relationships leaves open the question of the transmission of highly pathogenic influenza viruses (HSV) in the wild bird population. A deeper st

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Rothman, Daniel H., Stewart A. Levin, and Fabio Rocca. "Residual migration: Applications and limitations." GEOPHYSICS 50, no. 1 (1985): 110–26. http://dx.doi.org/10.1190/1.1441822.

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The correct migration of seismic data depends on the accuracy of the chosen velocity model. Rocca and Salvador (1982) showed that small errors in the velocity model may be efficiently corrected by applying a residual migration to previously migrated data, rather than remigrating the original data with a corrected velocity field. The effective velocity used in this residual processing is usually small compared to the original migration velocity. This decreases computational cost relative to a full migration, and allows the initial migration to be done with a less accurate but faster algorithm t

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Krebs, Jerome R. "Three‐dimensional migration of swath surveys." GEOPHYSICS 55, no. 9 (1990): 1251–59. http://dx.doi.org/10.1190/1.1442941.

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A three‐dimensional (3-D) wave‐equation migration program is used to migrate swath data (swath data are here defined as a very narrow 3-D survey consisting of approximately ten seismic lines and having a width of about 500 m). Three‐dimensionally migrated swath data give an accurate 3-D image of the subsurface and have a higher signal‐to‐noise ratio than 2-D data. These advantages are gained at the expense of lateral resolution in the crossline direction and less extensive 3-D subsurface coverage. Since swaths are on the order of one‐tenth the size of a normal 3-D survey, the costs of gatherin

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Chavent, Guy, and René‐Edouard Plessix. "An optimal true‐amplitude least‐squares prestack depth‐migration operator." GEOPHYSICS 64, no. 2 (1999): 508–15. http://dx.doi.org/10.1190/1.1444557.

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In order to define an optimal true‐amplitude prestack depth migration for multishot and multitrace data, we develop a general methodology based on the least‐squares data misfit function associated with a forward model. The amplitude of the migrated events are restored at best for any given geometry and any given preliminary filtering and amplitude correction of the data. The migrated section is then the gradient of the cost function multiplied by a weight matrix. A study of the Hessian associated with this data misfit shows how efficiently to find a good weight matrix via the computation of on

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MIKHALEVSKYI, V., G. MIKHALEVSKA, and О. SHOKHANOV. "FEATURES OF THE SYSTEM OF AUTOMATION OF PROCESSES OF CONSTRUCTION OF HYBRID INFRASTRUCTURE WITH TRANSFER OF ALL CONFIGURATION DATA." Computer Systems and Information Technologies 1, no. 1 (2020): 68–74. http://dx.doi.org/10.31891/csit-2020-1-9.

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The main features of the automated system development for synchronizing user data and various aspects of the Exchange Server infrastructure are discussed in the article. The system must make an inventory of the existing environment, make reports, accept data of the enterprise wishes and independently configure the components involved in user migration. The system must also restore all user settings that existed before the migration. It is the description of the automation of the building a hybrid infrastructure processes with the transfer of all configuration data and subsequent automatic conf

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