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Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Large-scale measurement"

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OZONO, Shigeo. "Special Issue on Measurement of Large Scale Dimension. Measurement of Large Scale Dimensions." Journal of the Japan Society for Precision Engineering 58, no. 5 (1992): 749–50. http://dx.doi.org/10.2493/jjspe.58.749.

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2

Okuyama, Eiki, and Masayuki Ito. "Combination of Double Scale Measurements for Large Scale Surface Profile Measurement." Applied Mechanics and Materials 870 (September 2017): 197–202. http://dx.doi.org/10.4028/www.scientific.net/amm.870.197.

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In the field of surface profile measurement, many software datums were proposed. When a measured surface profile is large, the number of sampling point becomes large. As the result, the influence of the random error becomes large. To decrease the error propagation, the concept of the division of the length datum is applied to the integration method for surface profile measurement. Analytical results and simulation show when integration method is used as the software datum for surface profile measurement, combination of the large scale integration method and short scale integration method is useful to decrease the error propagation.
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Bagnulo, Marcelo, Philip Eardley, Trevor Burbridge, Brian Trammell, and Rolf Winter. "Standardizing large-scale measurement platforms." ACM SIGCOMM Computer Communication Review 43, no. 2 (April 29, 2013): 58–63. http://dx.doi.org/10.1145/2479957.2479967.

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Zhang, G. X., J. W. Yao, Z. R. Qiu, W. C. Hu, F. Z. Fang, and X. H. Li. "Large-scale space angle measurement." CIRP Annals 57, no. 1 (2008): 525–28. http://dx.doi.org/10.1016/j.cirp.2008.03.122.

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O'ISHI, Tadanao. "Special Issue on Measurement of Large Scale Dimension. Length Standards for Large Scale Dimension Measurement." Journal of the Japan Society for Precision Engineering 58, no. 5 (1992): 751–54. http://dx.doi.org/10.2493/jjspe.58.751.

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6

Tröster, Tilman, Ariel G. Sánchez, Marika Asgari, Chris Blake, Martín Crocce, Catherine Heymans, Hendrik Hildebrandt, et al. "Cosmology from large-scale structure." Astronomy & Astrophysics 633 (January 2020): L10. http://dx.doi.org/10.1051/0004-6361/201936772.

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We reanalyse the anisotropic galaxy clustering measurement from the Baryon Oscillation Spectroscopic Survey (BOSS), demonstrating that using the full shape information provides cosmological constraints that are comparable to other low-redshift probes. We find Ωm = 0.317+0.015−0.019, σ8 = 0.710±0.049, and h = 0.704 ± 0.024 for flat ΛCDM cosmologies using uninformative priors on Ωch2, 100θMC, ln1010As, and ns, and a prior on Ωbh2 that is much wider than current constraints. We quantify the agreement between the Planck 2018 constraints from the cosmic microwave background and BOSS, finding the two data sets to be consistent within a flat ΛCDM cosmology using the Bayes factor as well as the prior-insensitive suspiciousness statistic. Combining two low-redshift probes, we jointly analyse the clustering of BOSS galaxies with weak lensing measurements from the Kilo-Degree Survey (KV450). The combination of BOSS and KV450 improves the measurement by up to 45%, constraining σ8 = 0.702 ± 0.029 and S8 = σ8 Ωm/0.3 = 0.728 ± 0.026. Over the full 5D parameter space, the odds in favour of a single cosmology describing galaxy clustering, lensing, and the cosmic microwave background are 7 ± 2. The suspiciousness statistic signals a 2.1 ± 0.3σ tension between the combined low-redshift probes and measurements from the cosmic microwave background.
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7

Sheng, Ying, Yukun Wang, Siwei Liu, Cuiping Wang, and Juntong Xi. "Large-Scale Measurement Layout Optimization Method Based on Laser Multilateration." Machines 10, no. 11 (October 28, 2022): 988. http://dx.doi.org/10.3390/machines10110988.

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Laser multilateration is a measurement method based on the distance intersection of multiple laser trackers which has been widely used in large-scale measurements. However, the layout of laser trackers has a great impact on the final measurement accuracy. In order to improve the overall measurement accuracy, firstly, a measurement uncertainty model based on laser multilateration is established. Secondly, a fast laser intersection detection constraint algorithm based on a k-DOPS bounding box and an adaptive target ball incident angle constraint detection algorithm are established for large-scale measurement scenes. Finally, the constrained layout optimization of the laser trackers is realized by using an improved cellular genetic algorithm. The results show that the optimized system layout can achieve the full coverage of measurement points and has higher measurement accuracy. Compared with the traditional genetic algorithm, the improved cellular genetic algorithm converges faster and obtains a better position layout.
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KATO, KENTARO. "Measurement Issues in Large-Scale Educational Assessment." Annual Report of Educational Psychology in Japan 55 (2016): 148–64. http://dx.doi.org/10.5926/arepj.55.148.

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Liu, Jiangchuan, Xinyan Zhang, Bo Li, Qian Zhang, and Wenwu Zhu. "Distributed distance measurement for large-scale networks." Computer Networks 41, no. 2 (February 2003): 177–92. http://dx.doi.org/10.1016/s1389-1286(02)00373-0.

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Paxson, V., J. Mahdavi, A. Adams, and M. Mathis. "An architecture for large scale Internet measurement." IEEE Communications Magazine 36, no. 8 (1998): 48–54. http://dx.doi.org/10.1109/35.707817.

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Дисертації з теми "Large-scale measurement"

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Motamedi, Reza. "Measurement-based Characterization of Large-Scale Networked Systems." Thesis, University of Oregon, 2017. http://hdl.handle.net/1794/22267.

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As the Internet has grown to represent arguably the largest “engineered” system on earth, network researchers have shown increasing interest in measuring this large-scale networked system. In the process, structures such as the physical Internet or the many different (logical) overlay networks that this physical infrastructure enables have been the focus of numerous studies. Many of these studies have been fueled by the ease of access to “big data”. Moreover, they benefited from advances in the study of complex networks. However, an important missing aspect in typical applications of complex network theory to the study of real-world distributed systems has been a general lack of attention to domain knowledge. On the one hand, missing or superficial domain knowledge can negatively affect the studies “input”; that is, limitations or idiosyncrasies of the measurement methods can render the resulting graphs difficult to interpret if not meaningless. On the other hand, lacking or insufficient domain knowledge can result in specious “output”; that is, popular graph abstractions of real-world systems are incapable of accounting for “details” that are important from an engineering perspective. In this thesis, we take a closer look at measurement-based characterization of a few real-world large-scale networked systems and focus on the role that domain knowledge plays in gaining a thorough understanding of these systems key properties and behavior. More specifically, we use domain knowledge to (i) design context-aware measurement strategies that capture the relevant information about the system of interest, (ii) analyze the captured view of the networked system baring in mind the abstraction imposed by the chosen graph representation, and (iii) scrutinize the results derived from the analysis of the graph-based representations by investigating the root causes underlying these findings. The main technical contribution of our work is twofolds. First, we establish concrete connections between the amount and level of domain knowledge needed and the quality of the measurements collected from networked systems. Second, we also provide concrete evidence for the role that domain knowledge plays in the analysis of views inferred from measurements collected from large-scale networked systems
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Lee, Hsin-Tsang. "IRLbot: design and performance analysis of a large-scale web crawler." Texas A&M University, 2008. http://hdl.handle.net/1969.1/85914.

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This thesis shares our experience in designing web crawlers that scale to billions of pages and models their performance. We show that with the quadratically increasing complexity of verifying URL uniqueness, breadth-first search (BFS) crawl order, and fixed per-host rate-limiting, current crawling algorithms cannot effectively cope with the sheer volume of URLs generated in large crawls, highly-branching spam, legitimate multi-million-page blog sites, and infinite loops created by server-side scripts. We offer a set of techniques for dealing with these issues and test their performance in an implementation we call IRLbot. In our recent experiment that lasted 41 days, IRLbot running on a single server successfully crawled 6:3 billion valid HTML pages (7:6 billion connection requests) and sustained an average download rate of 319 mb/s (1,789 pages/s). Unlike our prior experiments with algorithms proposed in related work, this version of IRLbot did not experience any bottlenecks and successfully handled content from over 117 million hosts, parsed out 394 billion links, and discovered a subset of the web graph with 41 billion unique nodes.
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Harpold, Adrian Adam. "Stream Discharge Measurement Using A Large-Scale Paticle Image Velocimetry Prototype." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/40870.

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Flow information is necessary in many diverse applications including water supply management, pollution control, irrigation, flood control, energy generation, and industrial use. New technologies have been developed for the establishment of stage-discharge relationships due to concerns about costs, accuracy, and safety of traditional discharge estimation methods. One emerging technology for measuring open-channel flow is Large-Scale Particle Image Velocimetry (LSPIV). LSPIV is a system capable of measuring surface velocity by collecting and analyzing recorded images of the stream surface. LSPIV has several advantages over conventional discharge measurement techniques: LSPIV is safer, could be automated to reduce labor, and could produce â real-timeâ discharge measurements. Therefore, the overall goal of this study was to evaluate the accuracy and feasibility of using LSPIV to measure discharge in low-order streams. The specific goals were to develop and test a prototype under varying conditions in a laboratory flume, adapt the prototype for field conditions, test the accuracy of the prototype in the field, and assess and recommend improvements for LSPIV operation as a stream discharge measuring device. The laboratory experiments results indicated that LSPIV accuracy was influenced by camera angle, surface disturbances and flow regime (Froude number), and particle seeding density. Camera angle was optimum around 15 degrees, with larger camera angles producing more error due to image distortion. Conditions at high Froude numbers likely produced out-of-plane displacement losses due to surface disturbances. Low Froude numbers also showed under-predictions, which were likely due to agglomeration of the tracer particles at low velocities. Finally, the laboratory results demonstrated that tracer seeding density should be maximized and that densities below three particles per interrogation window should significantly reduce LSPIV accuracy. The LSPIV prototype was tested at two low-order streams after developing a field prototype and operating procedures. Under field conditions, the prototype acquired consistent images, performed the necessary image processing, and established rules for estimating input parameters. The accuracy of LSPIV was evaluated using a Flo-Mate 2000 current meter and a permanent weir. Overall, twenty discharge measurements were taken with each measuring device at Stroubles Creek and Crab Creek. The discharges measured ranged from 0.12 to 63 cfs, which corresponded to a large range of velocities, with both simple and complex flow patterns. Problems were encountered from surface glare reducing image quality at both sites. The LSPIV prototype was accurate for most measuring conditions with a mean error of -1.7%, compared to the weir measurements. The LSPIV measurements tended to under-predict discharge at high stages and had greater error at moderate flows (up to 39%) compared to the weir. However, at low flow conditions LSPIV showed improved discharge accuracy over the current meter, in comparison to the weir measurements. The LSPIV discharge measurements were not statistically different from either the current meter or weir (á = 0.05). Finally, the LSPIV discharge measurements had an uncertainty of approximately ±14% (at a 95% confidence interval). In conclusion, LSPIV accuracy can be degraded by surface disturbances, inadequate illumination, and poor seeding densities. However, LSPIV showed adequate accuracy with the potential to become competitive with conventional discharge measurement techniques and therefore, has the potential to reduce costs and increase the geographic extent of surface water monitoring networks.
Master of Science
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4

Xu, Xiaoying. "Robust Measurement of the Cosmic Distance Scale Using Baryon Acoustic Oscillations." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/241935.

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We present techniques for obtaining precision distance measurements using the baryon acoustic oscillations (BAO) through controlling systematics and reducing statistical uncertainties. Using the resulting distance-redshift relation, we can infer cosmological parameters such as w, the equation of state of dark energy. We introduce a new statistic, ɷ(l)(r(s)), for BAO analysis that affords better control over systematics. It is computed by band-filtering the power spectrum P(k) or the correlation function ξ(r) to extract the BAO signal. This is conducive to several favourable outcomes. We compute ɷ(l)(r(s)) from 44 simulations and compare the results to P(k) and ξ(r). We find that the acoustic scales and theoretical errors we measure are consistent between all three statistics. We demonstrate the first application of reconstruction to a galaxy redshift survey. Reconstruction is designed to partially undo the effects of non-linear structure growth on the BAO, allowing more precise measurements of the acoustic scale. We also present a new method for deriving a smooth covariance matrix based on a Gaussian model. In addition, we develop and perform detailed robustness tests on the ξ(r) model we employ to extract the BAO scale from the data. Using these methods, we obtain spherically-averaged distances to z = 0.35 and z = 0.57 from SDSS DR7 and DR9 with 1.9% and 1.7% precision respectively. Combined with WMAP7 CMB observations, SNLS3 data and BAO measurements from 6dF, we measure w = -1.08 ± 0.08 assuming a wCDM cosmology. This represents a ~8% measurement of w and is consistent with a cosmological constant.The preceding does not capture the expansion history of the universe, H(z), encoded in the line-of-sight distance scale. To disentangle H(z), we exploit the anisotropic BAO signal that arises if we assume the wrong cosmology when calculating the clustering distribution. Since we expect the BAO signal to be isotropic, we can use the magnitude of the anisotropy to separately measure H(z) and D(A)(z). We apply our simple models to SDSS DR7 data and obtain a ~3.6% measurement of D(A)(z=0.35) and a ~8.4% measurement of H(z = 0.35).
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Boldetti, Carlo. "Multi-scale measurement and modelling of large deformation of structural metals during thermomechanical processing." Thesis, University of Sheffield, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434486.

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6

Hecht, Martin. "Optimierung von Messinstrumenten im Large-scale Assessment." Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17270.

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Messinstrumente stellen in der wissenschaftlichen Forschung ein wesentliches Element zur Erkenntnisgewinnung dar. Das Besondere an Messinstrumenten im Large-scale Assessment in der Bildungsforschung ist, dass diese normalerweise für jede Studie neu konstruiert werden und dass die Testteilnehmer verschiedene Versionen des Tests bekommen. Hierbei ergeben sich potentielle Gefahren für die Akkuratheit und Validität der Messung. Um solche Gefahren zu minimieren, sollten (a) die Ursachen für Verzerrungen der Messung und (b) mögliche Strategien zur Optimierung der Messinstrumente eruiert werden. Deshalb wird in der vorliegenden Dissertation spezifischen Fragestellungen im Rahmen dieser beiden Forschungsanliegen nachgegangen.
Measurement instruments are essential elements in the acquisition of knowledge in scientific research. Special features of measurement instruments in large-scale assessments of student achievement are their frequent reconstruction and the usage of different test versions. Here, threats for the accuracy and validity of the measurement may emerge. To minimize such threats, (a) sources for potential bias of measurement and (b) strategies to optimize measuring instruments should be explored. Therefore, the present dissertation investigates several specific topics within these two research areas.
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Shabara, Yahia. "Establishing Large-Scale MIMO Communication: Coding for Channel Estimation." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618578732285999.

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McKellar, Steven. "An extension to the OSI model of network management for large-scale collaborative performance measurement." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614727.

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Yoon, Yeo Jun. "Study of the utilization and benefits of phasor measurement units for large scale power system state estimation." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3345.

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This thesis will investigate the impact of the use of the Phasor Measurement Units (PMU) on the state estimation problem. First, incorporation of the PMU measurements in a conventional state estimation program will be discussed. Then, the effect of adding PMU measurements on the state estimation solution accuracy will be studied. Bad data processing in the presence of PMU measurements will also be presented. Finally, a multiarea state estimation method will be developed. This method involves a two level estimation scheme, where the first level estimation is carried out by each area independently. The second level estimation is required in order to coordinate the solutions obtained by each area and also to detect and identify errors in the boundary measurements. The first objective of this thesis is to formulate the full weighted least square state estimation method using PMUs. The second objective is to derive the linear formulation of the state estimation problem when using only PMUs. The final objective is to formulate a two level multi-area state estimation scheme and illlustrate its performance via simulation examples.
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Domaleski, Christopher Stephen. "Exploring the Efficacy of Pre-Equating a Large Scale Criterion-Referenced Assessment with Respect to Measurement Equivalence." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/eps_diss/3.

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This investigation examined the practice of relying on field test item calibrations in advance of the operational administration of a large scale assessment for purposes of equating and scaling. Often termed “pre-equating,” the effectiveness of this method is explored for a statewide, high-stakes assessment in grades three, five, and seven for the content areas of language arts, mathematics, and social studies. Pre-equated scaling was based on item calibrations using the Rasch model from an off-grade field test event in which students tested were one grade higher than the target population. These calibrations were compared to those obtained from post-equating, which used the full statewide population of examinees. Item difficulty estimates and Test Characteristic Curves (TCC) were compared for each approach and found to be similar. The Root Mean Square Error (RMSE) of the theta estimates for each approach ranged from .02 to .12. Moreover, classification accuracy for the pre-equated approach was generally high compared to results from post-equating. Only 3 of the 9 tests examined showed differences in the percent of students classified as passing; errors ranged from 1.7 percent to 3 percent. Measurement equivalence between the field test and operational assessment was also explored using the Differential Functioning of Items and Tests (DFIT) framework. Overall, about 20 to 40 percent of the items on each assessment exhibited statistically significant Differential Item Functioning (DIF). Differential Test Functioning (DTF) was significant for fully 7 tests. There was a positive relationship between the magnitude of DTF and degree of incongruence between pre-equating and post-equating. Item calibrations, score consistency, and measurement equivalence were also explored for a test calibrated with the one, two, and three parameter logistic model, using the TCC equating method. Measurement equivalence and score table incongruence was found to be slightly more pronounced with this approach. It was hypothesized that differences between the field test and operational tests resulted from 1) recency of instruction 2) cognitive growth and 3) motivation factors. Additional research related to these factors is suggested.
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Книги з теми "Large-scale measurement"

1

Fairall, Anthony. Large-scale structures in the universe. Cape Town: University of Cape Town, Department of Communication, 1998.

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2

Large-scale structures in the universe. Chichester, West Sussex, England: Wiley, 1998.

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3

Improving large-scale education assessment: Theory, issues, and practice. New York, NY: Routledge, 2012.

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4

Yifan, Dai, ed. Large and middle-scale aperture aspheric surfaces: Lapping, polishing and measurement. Hoboken: John Wiley and Sons, Inc., 2015.

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5

Carola, Seitter Waltraut, Duerbeck Hilmar W. 1948-, and Tacke M. 1958-, eds. Large-scale structures in the universe: Observational and analytical methods. Berlin: Springer-Verlag, 1988.

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6

In Situ Large-Scale CO₂ Observations Working Group. A large-scale CO₂ observing plan: In situ oceans and atmosphere (LSCOP). Washington, D.C.]: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, 2002.

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7

Gerald, Tindal, and Haladyna Thomas M, eds. Large-scale assessment programs for all students: Validity, technical adequacy, and implementation. Mahwah, N.J: L. Erlbaum, 2002.

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8

1942-, Evans John M., and United States. National Bureau of Standards, eds. Measurement technology for automation in construction and large scale assembly: Proceedings of a workshop. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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1963-, Coles Peter, Martinez V. J. 1962-, and Pons-Bordería Maria-Jesus, eds. Mapping, measuring, and modelling the universe: Workshop held in Valencia, Spain, 18-22 September 1995. San Francisco, Calif: Astronomical Society of the Pacific, 1996.

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10

Center, Lewis Research, ed. Preliminary measurement of the noise from the 2/9 scale model of the large-scale advanced propfan (LAP) propeller, SR-7A. [Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1985.

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Частини книг з теми "Large-scale measurement"

1

Franceschini, Fiorenzo, Maurizio Galetto, Domenico Maisano, Luca Mastrogiacomo, and Barbara Pralio. "Evaluation of Measurement Uncertainty." In Distributed Large-Scale Dimensional Metrology, 189–219. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-543-9_8.

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Thimm, Matthias. "Towards Large-Scale Inconsistency Measurement." In Lecture Notes in Computer Science, 195–206. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11206-0_19.

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3

Beaton, Albert E., and John L. Barone. "Large-Scale Group-Score Assessment." In Methodology of Educational Measurement and Assessment, 233–84. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58689-2_8.

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Kirsch, Irwin, Mary Louise Lennon, Kentaro Yamamoto, and Matthias von Davier. "Large-Scale Assessments of Adult Literacy." In Methodology of Educational Measurement and Assessment, 285–310. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58689-2_9.

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Maris, Gunter, Timo Bechger, and Maarten Marsman. "Bayesian Inference in Large-Scale Computational Psychometrics." In Methodology of Educational Measurement and Assessment, 109–31. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74394-9_7.

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Desa, Deana, Fons J. R. van de Vijver, Ralph Carstens, and Wolfram Schulz. "Measurement Invariance in International Large-scale Assessments." In Advances in Comparative Survey Methods, 879–910. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781118884997.ch40.

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Shih, Jeffrey C., Marsha Ing, and James E. Tarr. "Addressing Measurement Issues in Two Large-Scale Mathematics Classroom Observation Protocols." In Large-Scale Studies in Mathematics Education, 363–71. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-07716-1_16.

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Maehler, Débora B., and Beatrice Rammstedt. "Large-Scale Assessment in Education: Analysing PIAAC Data." In Methodology of Educational Measurement and Assessment, 1–6. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47515-4_1.

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Meier, G. E. A., and B. Stasicki. "Density Measurement of Large Scale Transonic Flow Fields." In IUTAM Symposium Transsonicum IV, 171–76. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0017-8_27.

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Pedrero, Víctor. "Measurement of Factor Invariance in Large-Scale Tests." In Validity of Educational Assessments in Chile and Latin America, 205–34. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78390-7_9.

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Тези доповідей конференцій з теми "Large-scale measurement"

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Wallman, Joel J., and Joseph Emerson. "Characterizing large-scale quantum devices." In Quantum Information and Measurement. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/qim.2019.s3b.2.

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Dalton, B. J. "Decoherence Rates in Large Scale Quantum Computers." In QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING. AIP, 2004. http://dx.doi.org/10.1063/1.1834463.

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Rüth, Jan, Christian Bormann, and Oliver Hohlfeld. "Large-scale scanning of TCP's initial window." In IMC '17: Internet Measurement Conference. New York, NY, USA: ACM, 2017. http://dx.doi.org/10.1145/3131365.3131370.

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Raman, Ram Sundara, Leonid Evdokimov, Eric Wurstrow, J. Alex Halderman, and Roya Ensafi. "Investigating Large Scale HTTPS Interception in Kazakhstan." In IMC '20: ACM Internet Measurement Conference. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3419394.3423665.

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Gugg, Christoph, Paul O'Leary, and Matthew Harker. "Large scale optical position sensitive detector." In 2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, 2013. http://dx.doi.org/10.1109/i2mtc.2013.6555720.

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Sánchez, Mario A., Fabián E. Bustamante, Balachander Krishnamurthy, and Walter Willinger. "Experiment Coordination for Large-scale Measurement Platforms." In SIGCOMM '15: ACM SIGCOMM 2015 Conference. New York, NY, USA: ACM, 2015. http://dx.doi.org/10.1145/2787394.2787401.

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Hao, Qun, and Dacheng Li. "Large-scale form and position error measurement." In Photonics China '98, edited by Shenghua Ye. SPIE, 1998. http://dx.doi.org/10.1117/12.318386.

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Richter, Philipp, Oliver Gasser, and Arthur Berger. "Illuminating large-scale IPv6 scanning in the internet." In IMC '22: ACM Internet Measurement Conference. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3517745.3561452.

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Meza, Justin, Tianyin Xu, Kaushik Veeraraghavan, and Onur Mutlu. "A Large Scale Study of Data Center Network Reliability." In IMC '18: Internet Measurement Conference. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3278532.3278566.

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Takada, Koji, Masato Aketagawa, Kunio Torii, Shoji Ogawa, and Yoshitaka Kozakura. "Geometrical accuracy measurement for large-scale steel bridge members." In Measurement Technology and Intelligent Instruments, edited by Li Zhu. SPIE, 1993. http://dx.doi.org/10.1117/12.156499.

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Звіти організацій з теми "Large-scale measurement"

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Linsner, M., P. Eardley, T. Burbridge, and F. Sorensen. Large-Scale Broadband Measurement Use Cases. RFC Editor, May 2015. http://dx.doi.org/10.17487/rfc7536.

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Burbridge, T., P. Eardley, M. Bagnulo, and J. Schoenwaelder. Information Model for Large-Scale Measurement Platforms (LMAPs). RFC Editor, August 2017. http://dx.doi.org/10.17487/rfc8193.

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Bagnulo, M., T. Burbridge, S. Crawford, P. Eardley, and A. Morton. A Reference Path and Measurement Points for Large-Scale Measurement of Broadband Performance. RFC Editor, February 2015. http://dx.doi.org/10.17487/rfc7398.

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Evans, John M. Measurement technology for automation in construction and large scale assembly :. Gaithersburg, MD: National Bureau of Standards, 1985. http://dx.doi.org/10.6028/nbs.ir.85-3310e1985.

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Eardley, P., A. Morton, M. Bagnulo, T. Burbridge, P. Aitken, and A. Akhter. A Framework for Large-Scale Measurement of Broadband Performance (LMAP). RFC Editor, September 2015. http://dx.doi.org/10.17487/rfc7594.

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Tanny, Josef, Gabriel Katul, Shabtai Cohen, and Meir Teitel. Application of Turbulent Transport Techniques for Quantifying Whole Canopy Evapotranspiration in Large Agricultural Structures: Measurement and Theory. United States Department of Agriculture, January 2011. http://dx.doi.org/10.32747/2011.7592121.bard.

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Анотація:
Original objectives and revisions The original objectives of this research, as stated in the approved proposal were: 1. To establish guidelines for the use of turbulent transport techniques as accurate and reliable tool for continuous measurements of whole canopy ET and other scalar fluxes (e.g. heat and CO2) in large agricultural structures. 2. To conduct a detailed experimental study of flow patterns and turbulence characteristics in agricultural structures. 3. To derive theoretical models of air flow and scalar fluxes in agricultural structures that can guide the interpretation of TT measurements for a wide range of conditions. All the objectives have been successfully addressed within the project. The only modification was that the study focused on screenhouses only, while it was originally planned to study large greenhouses as well. This was decided due to the large amount of field and theoretical work required to meet the objectives within screenhouses. Background In agricultural structures such as screenhouses and greenhouses, evapotranspiration (ET) is currently measured using lysimeters or sap flow gauges. These measurements provide ET estimates at the single-plant scale that must then be extrapolated, often statistically or empirically, to the whole canopy for irrigation scheduling purposes. On the other hand, turbulent transport techniques, like the eddy covariance, have become the standard for measuring whole canopy evapotranspiration in the open, but their applicability to agricultural structures has not yet been established. The subject of this project is the application of turbulent transport techniques to estimate ET for irrigation scheduling within large agricultural structures. Major conclusions and achievements The major conclusions of this project are: (i) the eddy covariance technique is suitable for reliable measurements of scalar fluxes (e.g., evapotranspiration, sensible heat, CO2) in most types of large screenhouses under all climatic conditions tested. All studies resulted with fair energy balance closures; (ii) comparison between measurements and theory show that the model is capable in reliably predicting the turbulent flow characteristics and surface fluxes within screenhouses; (iii) flow characteristics within the screenhouse, like flux-variance similarity and turbulence intensity were valid for the application of the eddy covariance technique in screenhouses of relatively dilute screens used for moderate shading and wind breaking. In more dense screens, usually used for insect exclusions, development of turbulent conditions was marginal; (iv) installation of the sensors requires that the system’s footprint will be within the limits of the screenhouse under study, as is the case in the open. A footprint model available in the literature was found to be reliable in assessing the footprint under screenhouse conditions. Implications, both scientific and agricultural The study established for the first time, both experimentally and theoretically, the use of the eddy covariance technique for flux measurements within agricultural screenhouses. Such measurements, along with reliable theoretical models, will enable more accurate assessments of crop water use which may lead to improved crop water management and increased water use efficiency of screenhouse crops.
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Zhang, Renduo, and David Russo. Scale-dependency and spatial variability of soil hydraulic properties. United States Department of Agriculture, November 2004. http://dx.doi.org/10.32747/2004.7587220.bard.

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Water resources assessment and protection requires quantitative descriptions of field-scale water flow and contaminant transport through the subsurface, which, in turn, require reliable information about soil hydraulic properties. However, much is still unknown concerning hydraulic properties and flow behavior in heterogeneous soils. Especially, relationships of hydraulic properties changing with measured scales are poorly understood. Soil hydraulic properties are usually measured at a small scale and used for quantifying flow and transport in large scales, which causes misleading results. Therefore, determination of scale-dependent and spatial variability of soil hydraulic properties provides the essential information for quantifying water flow and chemical transport through the subsurface, which are the key processes for detection of potential agricultural/industrial contaminants, reduction of agricultural chemical movement, improvement of soil and water quality, and increase of agricultural productivity. The original research objectives of this project were: 1. to measure soil hydraulic properties at different locations and different scales at large fields; 2. to develop scale-dependent relationships of soil hydraulic properties; and 3. to determine spatial variability and heterogeneity of soil hydraulic properties as a function of measurement scales. The US investigators conducted field and lab experiments to measure soil hydraulic properties at different locations and different scales. Based on the field and lab experiments, a well-structured database of soil physical and hydraulic properties was developed. The database was used to study scale-dependency, spatial variability, and heterogeneity of soil hydraulic properties. An improved method was developed for calculating hydraulic properties based on infiltration data from the disc infiltrometer. Compared with the other methods, the proposed method provided more accurate and stable estimations of the hydraulic conductivity and macroscopic capillary length, using infiltration data collected atshort experiment periods. We also developed scale-dependent relationships of soil hydraulic properties using the fractal and geostatistical characterization. The research effort of the Israeli research team concentrates on tasks along the second objective. The main accomplishment of this effort is that we succeed to derive first-order, upscaled (block effective) conductivity tensor, K'ᵢⱼ, and time-dependent dispersion tensor, D'ᵢⱼ, i,j=1,2,3, for steady-state flow in three-dimensional, partially saturated, heterogeneous formations, for length-scales comparable with those of the formation heterogeneity. Numerical simulations designed to test the applicability of the upscaling methodology to more general situations involving complex, transient flow regimes originating from periodic rain/irrigation events and water uptake by plant roots suggested that even in this complicated case, the upscaling methodology essentially compensated for the loss of sub-grid-scale variations of the velocity field caused by coarse discretization of the flow domain. These results have significant implications with respect to the development of field-scale solute transport models capable of simulating complex real-world scenarios in the subsurface, and, in turn, are essential for the assessment of the threat posed by contamination from agricultural and/or industrial sources.
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Tom, Joe, Marcelo Garcia, and Haode Wang. Review of Methodologies to Assess Bridge Safety During and After Floods. Illinois Center for Transportation, May 2022. http://dx.doi.org/10.36501/0197-9191/22-008.

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This report summarizes a review of technologies used to monitor bridge scour with an emphasis on techniques appropriate for testing during and immediately after design flood conditions. The goal of this study is to identify potential technologies and strategies for Illinois Department of Transportation that may be used to enhance the reliability of bridge safety monitoring during floods from local to state levels. The research team conducted a literature review of technologies that have been explored by state departments of transportation (DOTs) and national agencies as well as state-of-the-art technologies that have not been extensively employed by DOTs. This review included informational interviews with representatives from DOTs and relevant industry organizations. Recommendations include considering (1) acquisition of tethered kneeboard or surf ski-mounted single-beam sonars for rapid deployment by local agencies, (2) acquisition of remote-controlled vessels mounted with single-beam and side-scan sonars for statewide deployment, (3) development of large-scale particle image velocimetry systems using remote-controlled drones for stream velocity and direction measurement during floods, (4) physical modeling to develop Illinois-specific hydrodynamic loading coefficients for Illinois bridges during flood conditions, and (5) development of holistic risk-based bridge assessment tools that incorporate structural, geotechnical, hydraulic, and scour measurements to provide rapid feedback for bridge closure decisions.
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Schoen, Robert, Xiaotong Yang, and Gizem Solmaz. Psychometric Report for the 2019 Knowledge for Teaching Early Elementary Mathematics (K-TEEM) Test. Florida State University Libraries, May 2021. http://dx.doi.org/10.33009/lsi.1620243057.

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The 2019 Knowledge for Teaching Early Elementary Mathematics (2019 K-TEEM) test measures teachers’ mathematical knowledge for teaching early elementary mathematics. This report presents information about a large-scale field test of the 2019 K-TEEM test with 649 practicing educators. The report contains information about the development process used for the test; a description of the sample; descriptions of the procedures used for data entry, scoring of responses, and analysis of data; recommended scoring procedures; and findings regarding the distribution of test scores, standard error of measurement, and marginal reliability. The intended use of the data from the 2019 K-TEEM test is to serve as a measure of teacher knowledge that will be used in a randomized controlled trial to investigate the impact—and variation in impact—of a teacher professional-development program for early elementary teachers.
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Adam, Isabelle, Mihály Fazekas, Alfredo Hernandez Sanchez, Peter Horn, and Nóra Regös. Integrity Dividends: Procurement in the Water and Sanitation Sector in Latin America and the Caribbean. Edited by Marcello Basani and Jacopo Gamba. Inter-American Development Bank, January 2023. http://dx.doi.org/10.18235/0004688.

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Анотація:
Public procurement represents a large portion of government expenditure, more so in developing economies. Inefficiencies in public expenditures thus place a heavy burden on society. The Water and Sanitation (W&S) sector is especially vulnerable to public procurement inefficiencies due to the capital-intensive and complex nature of large-scale projects such as sewage, pipelines, and general maintenance. Recent studies have found that quality of corporate governance and transparency of water utilities as well as regulatory and supervisory agencies are key drivers of the sectors performance. To support better policies in the W&S sector, this report conducts a sectoral measurement of public procurement integrity using government administrative data and identifies effective interventions for improving the performance of utilities. The following questions are explored: Which types of integrity risk carry the highest economic costs? What are effective policy solutions? Which address the most impactful risks effectively? What are the price savings and project-delay-reducing impacts of such solutions? To this effect, the study analyzes data for six countries in the Latin American & Caribbean region. Several regression models were run to assess which indicators of integrity are good predictors of improved outcomes in terms of price (unit or relative) and quality (delays) of public purchases in the sector.
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