Увійти

Готові списки джерел за темами / Full sampling / Статті в журналах

Статті в журналах з теми "Full sampling"

Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Full sampling.

Автор: Grafiati

Опубліковано: 14 березня 2023

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Ознайомтеся з топ-50 статей у журналах для дослідження на тему "Full sampling".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Переглядайте статті в журналах для різних дисциплін та оформлюйте правильно вашу бібліографію.

1

Meier, Janosch, Arijit Misra, Stefan Preusler, and Thomas Schneider. "Orthogonal Full-Field Optical Sampling." IEEE Photonics Journal 11, no. 2 (April 2019): 1–9. http://dx.doi.org/10.1109/jphot.2019.2902726.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Inoshita, Chika, Seiichi Tagawa, Md Abdul Mannan, Yasuhiro Mukaigawa, and Yasushi Yagi. "Full-dimensional Sampling and Analysis of BSSRDF." IPSJ Transactions on Computer Vision and Applications 5 (2013): 119–23. http://dx.doi.org/10.2197/ipsjtcva.5.119.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Cheng, Weilin, Yu Wang, Hongwei Li, and Yuping Duan. "Learned Full-Sampling Reconstruction From Incomplete Data." IEEE Transactions on Computational Imaging 6 (2020): 945–57. http://dx.doi.org/10.1109/tci.2020.2996751.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Vu, Emily H., and Aaron J. Olson. "Conditional Point Sampling: A stochastic media transport algorithm with full geometric sampling memory." Journal of Quantitative Spectroscopy and Radiative Transfer 272 (September 2021): 107767. http://dx.doi.org/10.1016/j.jqsrt.2021.107767.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Yevick, David. "Renormalized multicanonical sampling." International Journal of Modern Physics C 27, no. 03 (February 23, 2016): 1650033. http://dx.doi.org/10.1142/s0129183116500339.

Повний текст джерела

Анотація:

For a homogeneous system divisible into identical, weakly interacting subsystems, the multicanonical procedure can be accelerated if it is first applied to determine the density of states for a single subsystem. This result is then employed to approximate the state density of a subsystem with twice the size that forms the starting point of a new multicanonical iteration. Since this compound subsystem interacts less on average with its environment, iterating this sequence of steps rapidly generates the state density of the full system.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Herrmann, Felix J., Yogi A. Erlangga, and Tim T. Lin. "Compressive simultaneous full-waveform simulation." GEOPHYSICS 74, no. 4 (July 2009): A35—A40. http://dx.doi.org/10.1190/1.3115122.

Повний текст джерела

Анотація:

The fact that the computational complexity of wavefield simulation is proportional to the size of the discretized model and acquisition geometry and not to the complexity of the simulated wavefield is a major impediment within seismic imaging. By turning simulation into a compressive sensing problem, where simulated data are recovered from a relatively small number of independent simultaneous sources, we remove this impediment by showing that compressively sampling a simulation is equivalent to compressively sampling the sources, followed by solving a reduced system. As in compressive sensing, this reduces sampling rate and hence simulation costs. We demonstrate this principle for the time-harmonic Helmholtz solver. The solution is computed by inverting the reduced system, followed by recovering the full wavefield with a program that promotes sparsity. Depending on the wavefield’s sparsity, this approach can lead to significant cost reductions, particularly when combined with the implicit preconditioned Helmholtz solver, which is known to converge even for decreasing mesh sizes and increasing angular frequencies. These properties make our scheme a viable alternative to explicit time-domain finite differences.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Wang, Huanyu, Yongshun Zhang, and Jianxin Wu. "Versatile, full‐spectrum, and swift network sampling for model generation." Pattern Recognition 129 (September 2022): 108729. http://dx.doi.org/10.1016/j.patcog.2022.108729.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Pei, Chuang, Xingpeng Yan, Zhiqiang Yan, Kai Zhao, Wu Yu, and Xiaoyu Jiang. "Bandwidth compression of full parallax holographic stereogram using nonuniform sampling." Journal of Optics 17, no. 10 (September 4, 2015): 105702. http://dx.doi.org/10.1088/2040-8978/17/10/105702.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Fleury, Kane, Emma Burns, Barbara Anderson, Robert Hoare, and Ralf Ohlemuller. "Books and Drawers full of Moths." Biodiversity Information Science and Standards 2 (June 15, 2018): e26710. http://dx.doi.org/10.3897/biss.2.26710.

Повний текст джерела

Анотація:

The Otago Museum houses one of New Zealand’s largest Lepidoptera collections that consists of more than 31,000 macro moth specimens collected across New Zealand over the last 30 years. Alongside this collection, supplementary information is found in detailed field notebooks that cover, for most sites, the total abundance of the different species present in these samples. We have been able to use the notebooks to work out the sampling intensity and sites to map both the collections and the abundances to some degree. It is impractical to collect everything. As a result, the common species are left out of collections and the rare and unusual sightings fill the collections. When planning to resample collecting sites to investigate changes in ecosystems, just relying on collections for species presence and absence would skew the results. It should also be noted that field notebooks are not a panacea for biological information as the information in them ages, so too can the reliability and accuracy of the notes within. Here we discuss how the field notebook data compares with the information accompanying the specimens housed within the museum collection. This is a recently digitised collection and allows an insight into the collectors sampling, vouchering and data practices and how these can affect modern interpretation and variation in repeat sampling.

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Pangandaheng, Romel A., Nego E. Bataragoa, and Jhon L. Tombokan. "Fish Species and Abundance in the Intertidal Zone around UNSRAT Marine Station, East Likupang District, North Minahasa Regency." JURNAL ILMIAH PLATAX 6, no. 1 (January 30, 2018): 107. http://dx.doi.org/10.35800/jip.6.1.2018.18907.

Повний текст джерела

Анотація:

Fish migration to the intertidal zone at high tide is for feeding, reproduction, escape from predator. The study was aimed to know the fish species inhabiting the intertidal zone, the individual abundance and fish catch biomass. Sampling was done at high tide in the afternoon and morning in new moon and full moon. Five sampling stations were selected and each station was sampled twice, so that total number of samplings were 10. This study used swept area method and covered a total area of 12,000/m2 (6,000m2 in new moon and full moon, respectively. Individual abundance of each species ranged from 0.0002 to 0.0120/ at new moon and from 0.00012 to 0.0102/ at full moon, respectively, and total abundance ranged from 0.0001 to 0.0111/ in both moon phases. The biomass of each species on the new moon 0.0003t o 0.1749g/ , full moon 0.0009 to 0.1224g/ , and the amount of biomass between the new moon and the full moon 0.0002 to 0,1329g/ .Keywords: Fish, migration, intertidal, reproduction.AbstrakIkan bermigrasi ke dalam zona intertidal pada saat air pasang adalah untuk mencari makan, bereproduksi, dan menghindar dari predator. Tujuan penelitian ini adalah untuk mengetahui spesies-spesies ikan yang ada didaerah intertidal dan mengetahui kelimpahan individu dan biomasa ikan yang tertangkap di daerah intertidal. Pengambilan sampel dilaksanakan pada ketika air pasang pada sore dan pagi hari setiap fase bulan baru dan purnama. Ditetapkan lima stasiun sampling dan setiap stasiun dilakukan dua kali sampling, sehingga jumlah sampling dalam lima stasiun 10 kali sampling. Dengan metode penelitian yang digunakan adalah metode swept area (daerah sapuan). Luas daerah sapuan pukat dalam 10 kali sampling adalah 12.000/m2 (6.000m2 pada bulan baru dan bulan purnama), Kelimpahan individu setiap spesies pada bulan baru berkisar antara 0,0002-0,0120/ , bulan purnama 0,00012-0,0102/ , dan jumlah kelimpahan antara bulan baru dan purnama 0,0001-0,0111/ . Kelimpahan biomasa setiap spesies yang paling melimpah pada bulan baru 0,0003-0,1749g/ , bulan purnama 0,0009-0,1224g/ , dan jumlah biomasa antara bulan baru dan purnama 0,0002-0,1329g/ ..Kata kunci : Ikan, bermigrasi, intertidal, reproduksi

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Tang, Shaojie, and Jing Yuan. "Optimal Sampling Gaps for Adaptive Submodular Maximization." Proceedings of the AAAI Conference on Artificial Intelligence 36, no. 8 (June 28, 2022): 8450–57. http://dx.doi.org/10.1609/aaai.v36i8.20821.

Повний текст джерела

Анотація:

Running machine learning algorithms on large and rapidly growing volumes of data is often computationally expensive, one common trick to reduce the size of a data set, and thus reduce the computational cost of machine learning algorithms, is probability sampling. It creates a sampled data set by including each data point from the original data set with a known probability. Although the benefit of running machine learning algorithms on the reduced data set is obvious, one major concern is that the performance of the solution obtained from samples might be much worse than that of the optimal solution when using the full data set. In this paper, we examine the performance loss caused by probability sampling in the context of adaptive submodular maximization. We consider a simple probability sampling method which selects each data point with probability at least r. If we set r=1, our problem reduces to finding a solution based on the original full data set. We define sampling gap as the largest ratio between the optimal solution obtained from the full data set and the optimal solution obtained from the samples, over independence systems. Our main contribution is to show that if the sampling probability of each data point is at least r and the utility function is policywise submodular, then the sampling gap is both upper bounded and lower bounded by 1/r. We show that the property of policywise submodular can be found in a wide range of real-world applications, including pool-based active learning and adaptive viral marketing.

Стилі APA, Harvard, Vancouver, ISO та ін.

12

Imaike, Takeshi, and Yukinori Sakuta. "Full Digital Phase Noise Measurement System based on Under Sampling Technique." IEEJ Transactions on Fundamentals and Materials 137, no. 1 (2017): 71–77. http://dx.doi.org/10.1541/ieejfms.137.71.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

13

Himelein, Kristen, Stephanie Eckman, Siobhan Murray, and Johannes Bauer. "Alternatives to full listing for second stage sampling: Methods and implications." Statistical Journal of the IAOS 33, no. 3 (August 19, 2017): 701–18. http://dx.doi.org/10.3233/sji-160341.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Lu, Yuxiao, Zhe Li, and Jianjun Zhou. "A full-swing area-efficient high-speed CMOS bootstrapped sampling switch." IEICE Electronics Express 10, no. 12 (2013): 20130336. http://dx.doi.org/10.1587/elex.10.20130336.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

15

Wang, Qinghua, and Shien Ri. "Sampling Moiré method for full-field deformation measurement: A brief review." Theoretical and Applied Mechanics Letters 12, no. 1 (January 2022): 100327. http://dx.doi.org/10.1016/j.taml.2022.100327.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

16

Wang, Dong, Fa-Chun Liang, Zhi-quan Peng, Yong-gang Wang, and Zong-hu Lin. "Gas–liquid two-phase flow measurements by full stream batch sampling." International Journal of Multiphase Flow 40 (April 2012): 113–25. http://dx.doi.org/10.1016/j.ijmultiphaseflow.2011.11.010.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Grasmueck, Mark, Ralf Weger, and Heinrich Horstmeyer. "Full-resolution 3D GPR imaging." GEOPHYSICS 70, no. 1 (January 2005): K12—K19. http://dx.doi.org/10.1190/1.1852780.

Повний текст джерела

Анотація:

Noninvasive 3D ground-penetrating radar (GPR) imaging with submeter resolution in all directions delineates the internal architecture and processes of the shallow subsurface. Full-resolution imaging requires unaliased recording of reflections and diffractions coupled with 3D migration processing. The GPR practitioner can easily determine necessary acquisition trace spacing on a frequency-wavenumber (f-k) plot of a representative 2D GPR test profile. Quarter-wavelength spatial sampling is a minimum requirement for full-resolution GPR recording. An intensely fractured limestone quarry serves as a test site for a 100-MHz 3D GPR survey with 0.1 m × 0.2 m trace spacing. This example clearly defines the geometry of fractures in four different orientations, including vertical dips to a depth of 20 m. Decimation to commonly used half-wavelength spatial sampling or only 2D migration processing makes most fractures invisible. The extra data-acquisition effort results in image volumes with submeter resolution, both in the vertical and horizontal directions. Such 3D data sets accurately image fractured rock, sedimentary structures, and archeological remains in previously unseen detail. This makes full-resolution 3D GPR imaging a valuable tool for integrated studies of the shallow subsurface.

Стилі APA, Harvard, Vancouver, ISO та ін.

18

Song, Jin. "The Effection of Electromagnetic Exploration by Sampling Delay." Advanced Materials Research 868 (December 2013): 154–58. http://dx.doi.org/10.4028/www.scientific.net/amr.868.154.

Повний текст джерела

Анотація:

Because of the effcetion of primary field. if select the sampling delay blindly, it will cause distortion of explanation of transient electromagnetic exploration. We analysis of the scope of influence of primary field at first, then study on the effect of different delays for detection:the small delay causes the early false anomaly. The full time apparent resistivity is less than the theoretical apparent resistivity. The depth of investigation gets small. On the contrary, the long time delay causes the loss of the superficial ground information. The full time apparent resistivity is more than the theoretical apparent resistivity. So it can reduce the false anomaly caused by the primary field decreases only when the acquisition of the inflection point delay is adopted. Then the computing apparent resistivity is close to the theoretical value and the apparent depth of investigation increases.

Стилі APA, Harvard, Vancouver, ISO та ін.

19

Esbensen, K., and V. Sivalingam. "The sampling interface—A critical Theory of Sampling success factor in process sampling and PAT." TOS Forum 2022, no. 11 (May 27, 2022): 115. http://dx.doi.org/10.1255/tosf.141.

Повний текст джерела

Анотація:

In the process industry arena, analytical endeavors are today well served by the Process Analytical Technology (PAT) framework, offering a plentitude of on-line analytics, mostly spectroscopic: UV-VIS, NIR, RAMAN, NMR, “acoustic chemometrics” a.o. This context is generally considered satisfactory, but there is a major catch. The present paper focuses on a fundamental feature in process sampling, the link between an on-line analytical technique and a moving stream of matter, which is to be characterised, monitored, and analysed. A process sampling operation can serve many objectives; process regulation, product or interim product characterisation, optimisation of raw material consumption, maximizing energy efficiency, pollution, and environmental impact management ‒ or process, plant, company, corporation decision making at supervisor and management levels concerning economics and risk management. All these objectives can only be meaningfully undertaken if based onrelevant information, that is, if based on reliable analytical data, which in turn is 100% dependent upon representative samples, or representative sensor signals. The singular common element in all of this is the process sampling interface. This paper develops a critique of most current interfaces, with a scathing verdict: the dual role of the process sampling interface as both delineating an appropriate aliquot volume while facilitating the specific analytical technique, has largely been overlooked, with a significant negative effect that is spelled out in full detail across implemented solutions across widely different application sectors. Most current process sampling interfaces do not comply with TOS’ demands, putting representativity severely at risk for heterogenous materials.

Стилі APA, Harvard, Vancouver, ISO та ін.

20

Ben Zaabza, H., E. A. Mäntysaari, and I. Strandén. "Estimation of individual animal SNP-BLUP reliability using full Monte Carlo sampling." JDS Communications 2, no. 3 (May 2021): 137–41. http://dx.doi.org/10.3168/jdsc.2020-0058.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

21

CHEN, Qi-Ke, Yong FAN, Liang-Chao LI, Jian-Yu YANG, and Yong-Hong ZHANG. "Design of W-band 16 elements full sampling focal plane linear array." Journal of Infrared and Millimeter Waves 32, no. 1 (2013): 23. http://dx.doi.org/10.3724/sp.j.1010.2013.00023.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Wang, Qinghua, Shien Ri, M. J. Mohammad Fikry, and Shinji Ogihara. "Multiplication sampling moire method for full-field deformation measurement of composite materials." Optics Letters 47, no. 1 (December 21, 2021): 70. http://dx.doi.org/10.1364/ol.445854.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

23

Sadef, Yumna, Tjalfe Gorm Poulsen, and Kai Bester. "Optimized sampling strategy for measurement of biomass properties during full-scale composting." Waste Management & Research 31, no. 8 (July 3, 2013): 775–82. http://dx.doi.org/10.1177/0734242x13496306.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

24

Akdeniz, Neslihan, and Kevin A. Janni. "Full-scale biofilter reduction efficiencies assessed using portable 24-hour sampling units." Journal of the Air & Waste Management Association 62, no. 2 (January 31, 2012): 170–82. http://dx.doi.org/10.1080/10473289.2011.639479.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Mattsson, Martin, Christos I. Kolitsidas, and B. L. G. Jonsson. "Dual-Band Dual-Polarized Full-Wave Rectenna Based on Differential Field Sampling." IEEE Antennas and Wireless Propagation Letters 17, no. 6 (June 2018): 956–59. http://dx.doi.org/10.1109/lawp.2018.2825783.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

26

Kurkcuoglu, Zeynep, Ivet Bahar, and Pemra Doruker. "ClustENM: ENM-Based Sampling of Essential Conformational Space at Full Atomic Resolution." Journal of Chemical Theory and Computation 12, no. 9 (August 18, 2016): 4549–62. http://dx.doi.org/10.1021/acs.jctc.6b00319.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Yang, Jizhong, Yunyue Elita Li, Yuzhu Liu, Yanwen Wei, and Haohuan Fu. "Mitigating the cycle-skipping of full-waveform inversion by random gradient sampling." GEOPHYSICS 85, no. 6 (October 22, 2020): R493—R507. http://dx.doi.org/10.1190/geo2020-0099.1.

Повний текст джерела

Анотація:

Full-waveform inversion (FWI) is a highly nonlinear and nonconvex problem. To mitigate the dependence of FWI on the quality of starting model and on the low frequencies in the data, we apply the gradient sampling algorithm (GSA) introduced for nonsmooth, nonconvex optimization problems to FWI. The search space is hugely expanded to have more freedom to accommodate large velocity errors in the starting model. The original implementation of GSA requires explicit calculation of the gradient at each sampled vector, which is prohibitively expensive. Based on the observation that a slight perturbation in the velocity model causes a small spatial shift of the wavefield, we have approximated the sampled gradients by crosscorrelating the space-shifted source- and receiver-side wavefields. Theoretical derivation suggests that the two wavefields should be shifted in the same direction to obtain reasonable low-wavenumber updates. The final descent search direction is obtained by summing all the shifted gradients. For practical implementation, we only take one random space shift at each time step during the gradient calculation. This simplification provides an efficient realization in which the computational costs and memory requirements are the same as conventional FWI. Multiple numerical examples demonstrate that the proposed method alleviates the cycle-skipping problem of conventional FWI when starting from very crude initial velocity models without low-frequency data.

Стилі APA, Harvard, Vancouver, ISO та ін.

28

Castorena, Juan, and Charles D. Creusere. "Sampling of Time-Resolved Full-Waveform LIDAR Signals at Sub-Nyquist Rates." IEEE Transactions on Geoscience and Remote Sensing 53, no. 7 (July 2015): 3791–802. http://dx.doi.org/10.1109/tgrs.2014.2383839.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Zhang, Wenhui, Hao Zhang, and Guofan Jin. "Adaptive-sampling angular spectrum method with full utilization of space-bandwidth product." Optics Letters 45, no. 16 (August 4, 2020): 4416. http://dx.doi.org/10.1364/ol.393111.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Steinberg, Jacob M., and Charles C. Eriksen. "Glider Sampling Simulations in High-Resolution Ocean Models." Journal of Atmospheric and Oceanic Technology 37, no. 6 (June 2020): 975–92. http://dx.doi.org/10.1175/jtech-d-19-0200.1.

Повний текст джерела

Анотація:

AbstractIdealized simulations of autonomous underwater glider sampling along sawtooth vertical–horizontal paths are carried out in two high-resolution ocean numerical models to explore the accuracy of isopycnal vertical displacement and geostrophic velocity profile estimates. The effects of glider flight speed, sampling pattern geometry, and measurement noise on velocity profile accuracy are explored to interpret recent full-ocean-depth Deepglider observations and provide sampling recommendations for glider missions. The average magnitude of velocity error profiles, defined as the difference between simulated glider-sampled geostrophic velocity profile estimates and model velocity profiles averaged over the spatial and temporal extent of corresponding simulated glider paths, is less than 0.02 m s−1 over most of the water column. This accuracy and the accuracy of glider geostrophic shear profile estimates are dependent on the ratio of mesoscale eddy to internal wave velocity amplitude. Projection of normal modes onto full-depth vertical profiles of model and simulated glider isopycnal vertical displacement and geostrophic velocity demonstrates that gliders are capable of resolving barotropic and baroclinic structure through at least the eighth baroclinic mode.

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Dalby, Carole Kathleen, Paul J. Catalano, Caitlin C. Donohue, Julie M. Bryar, Andrew David Norden, Judith Kostka, and Joseph O. Jacobson. "Limitations of QOPI end-of-life (EOL) data use for purposes of accountability: Comparison of sample versus full cohort analysis." Journal of Clinical Oncology 31, no. 31_suppl (November 1, 2013): 87. http://dx.doi.org/10.1200/jco.2013.31.31_suppl.87.

Повний текст джерела

Анотація:

87 Background: Quality Oncology Practice Initiative (QOPI) retrospectively collects process measures at the practice level. Sample size is determined by number of full-time equivalent physicians. Although intended as an improvement program, there is growing pressure to use QOPI for accountability. Methods: We investigated QOPI sampling strategy for EOL measures in a large three-site community oncology practice for all patients meeting QOPI sampling criteria. Analysis period was July 1 to December 31, 2012. We included all patients submitted for the QOPI EOL module and compared the QOPI sample to the full but non-QOPI cohort using Fisher’s exact test. To assess relative precision, we calculated rates and 95% confidence intervals (CI) for the sampled vs. full cohorts (inclusive of QOPI cohort). Results: 246 deaths were analyzed, with 34 (13.8%) from the QOPI sample. No statistically significant differences were found between sampled and full non-QOPI cohorts. However, sampling was associated with wide CIs compared to precision using the full cohort (Table); e.g. #38 yields a CI width of 24.2% QOPI vs. 4.9% full. Similarly, #47 shows CI width of 27.7% vs. 9.0%. Low statistical significance yet wide CIs indicate comparison data are representative but with variability in precision. Conclusions: Although no statistically significant differences were identified, comparing QOPI sampling strategy to full cohort yielded presence of marked differences in precision. We suggest caution in use of current QOPI EOL sampling strategy if used for purposes other than improvement. [Table: see text]

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Zhang, Xin, and Andrew Curtis. "Variational full-waveform inversion." Geophysical Journal International 222, no. 1 (April 11, 2020): 406–11. http://dx.doi.org/10.1093/gji/ggaa170.

Повний текст джерела

Анотація:

SUMMARY Seismic full-waveform inversion (FWI) can produce high-resolution images of the Earth’s subsurface. Since full-waveform modelling is significantly nonlinear with respect to velocities, Monte Carlo methods have been used to assess image uncertainties. However, because of the high computational cost of Monte Carlo sampling methods, uncertainty assessment remains intractable for larger data sets and 3-D applications. In this study, we propose a new method called variational FWI, which uses Stein variational gradient descent to solve FWI problems. We apply the method to a 2-D synthetic example and demonstrate that the method produces accurate approximations to those obtained by Hamiltonian Monte Carlo. Since variational inference solves the problem using optimization, the method can be applied to larger data sets and 3-D applications by using stochastic optimization and distributed optimization.

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Colarco, P. R., R. A. Kahn, L. A. Remer, and R. C. Levy. "Impact of satellite viewing-swath width on global and regional aerosol optical thickness statistics and trends." Atmospheric Measurement Techniques 7, no. 7 (July 31, 2014): 2313–35. http://dx.doi.org/10.5194/amt-7-2313-2014.

Повний текст джерела

Анотація:

Abstract. We use the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite aerosol optical thickness (AOT) product to assess the impact of reduced swath width on global and regional AOT statistics and trends. Along-track and across-track sampling strategies are employed, in which the full MODIS data set is sub-sampled with various narrow-swath (~ 400–800 km) and single pixel width (~ 10 km) configurations. Although view-angle artifacts in the MODIS AOT retrieval confound direct comparisons between averages derived from different sub-samples, careful analysis shows that with many portions of the Earth essentially unobserved, spatial sampling introduces uncertainty in the derived seasonal–regional mean AOT. These AOT spatial sampling artifacts comprise up to 60% of the full-swath AOT value under moderate aerosol loading, and can be as large as 0.1 in some regions under high aerosol loading. Compared to full-swath observations, narrower swath and single pixel width sampling exhibits a reduced ability to detect AOT trends with statistical significance. On the other hand, estimates of the global, annual mean AOT do not vary significantly from the full-swath values as spatial sampling is reduced. Aggregation of the MODIS data at coarse grid scales (10°) shows consistency in the aerosol trends across sampling strategies, with increased statistical confidence, but quantitative errors in the derived trends are found even for the full-swath data when compared to high spatial resolution (0.5°) aggregations. Using results of a model-derived aerosol reanalysis, we find consistency in our conclusions about a seasonal–regional spatial sampling artifact in AOT. Furthermore, the model shows that reduced spatial sampling can amount to uncertainty in computed shortwave top-of-atmosphere aerosol radiative forcing of 2–3 W m−2. These artifacts are lower bounds, as possibly other unconsidered sampling strategies would perform less well. These results suggest that future aerosol satellite missions having significantly less than full-swath viewing are unlikely to sample the true AOT distribution well enough to obtain the statistics needed to reduce uncertainty in aerosol direct forcing of climate.

Стилі APA, Harvard, Vancouver, ISO та ін.

34

Preisser, J. S., A. E. Sanders, and R. H. Lyles. "Differential Misclassification of Disease under Partial-Mouth Sampling." JDR Clinical & Translational Research 3, no. 4 (June 12, 2018): 388–94. http://dx.doi.org/10.1177/2380084418781508.

Повний текст джерела

Анотація:

Aim: The effect of misclassification of a cluster-level dichotomous outcome (disease) due to partial-cluster sampling on its association with a dichotomous exposure is investigated. Methods: Disease (e.g., chronic periodontitis) is deemed to exist in a cluster (e.g., full mouth) when a condition of interest (e.g., pocket depth or clinical attachment loss exceeding an established threshold) is present in number and pattern across observations (e.g., tooth sites) in the cluster according to a specific criterion. When a subset of observations within each cluster is selected (i.e., partial-mouth sampling), specificity of disease is 100% (in the absence of site-level measurement error), whereas sensitivity is imperfect and generally unknown. Using conditional probability arguments, we investigate disease misclassification under partial-cluster sampling and its impact on the estimated disease-exposure association when the exposure is cluster level and measured without error. Results: When the probability of disease varies by exposure status, outcome misclassification at the cluster level is differential under partial-cluster sampling and depends on 1) the partial recording protocol, including the number of observations sampled and the particular sites selected in a cluster; 2) the joint probability structure of the condition within clusters; and 3) the criterion for disease. A numeric example demonstrates that disease-exposure odds ratios under partial-cluster random sampling can be biased in either direction (toward or away from the null) relative to gold-standard odds ratios under full-cluster sampling. Conclusions: In general, misclassification of disease is differential under partial-cluster sampling. In particular, sensitivity and negative predictive values depend on exposure status, which leads to biased inference. Knowledge Transfer Statement: Partial-mouth sampling causes disease misclassification probabilities, including sensitivity, to vary by exposure groups when disease prevalence differs between groups. As a result, disease-exposure associations may be under- or overestimated by standard analysis procedures for periodontal data relative to full-mouth estimates. Procedures that address bias are needed for partial-recording protocols.

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Kaale, Gloria, and Mikidadi Muhanga. "Sexual health knowledge among secondary school students in Morogoro, Tanzania: half full or full empty?" International Journal of Health 5, no. 2 (October 3, 2017): 120. http://dx.doi.org/10.14419/ijh.v5i2.8190.

Повний текст джерела

Анотація:

Background: Sexual health knowledge (SHK) is very crucial as the world is facing HIV/AIDS tragedy, increased cases of sexually transmitted infections (STIs) and unsafe abortions among adolescents. It is obvious that knowledge is an important prevention factor for any disease.Objectives: The study was conducted to assess knowledge and attitude on sexual health among secondary school students in Morogoro Municipality. Specifically the study (I: (i) examined students’ knowledge and attitude on sexual transmitted infections, (ii) analyzed student's awareness on early pregnancy prevention, and; (iii) determined students’ knowledge on issues related to puberty.Methods: The study involved 75 respondents from five secondary schools and 13 key informants through purposive sampling and simple random sampling techniques. Data were collected using a structured questionnaire. Data collected were analyzed using Statistical Package for Social Science (SPSS) ver.12.Results: Findings revealed that 79.8% of the respondents had knowledge on sexually transmitted infections, 86.5% were aware ofmethods of controlling early pregnancies; 83.9% have never used protective gears during sexual intercourses, and 54.7% did not understand a menstruation cycle.Conclusion: The study recommended for provision of sexual health knowledge to students to reduce incidences of early pregnancies and sexually transmitted infections; likewise on the need to use protective gears during sexual intercourses. Knowledge concerning sexual health is vital for all particularly for adolescents, as they are vulnerable to adopt negative behaviors if not guided properly and at the right age.

Стилі APA, Harvard, Vancouver, ISO та ін.

36

Sadef, Yumna, Tjalfe G. Poulsen, and Kai Bester. "Quantifying measurement uncertainty in full-scale compost piles using organic micro-pollutant concentrations." Waste Management & Research: The Journal for a Sustainable Circular Economy 32, no. 5 (April 11, 2014): 371–78. http://dx.doi.org/10.1177/0734242x14529619.

Повний текст джерела

Анотація:

Reductions in measurement uncertainty for organic micro-pollutant concentrations in full scale compost piles using comprehensive sampling and allowing equilibration time before sampling were quantified. Results showed that both application of a comprehensive sampling procedure (involving sample crushing) and allowing one week of equilibration time before sampling reduces measurement uncertainty by about 50%. Results further showed that for measurements carried out on samples collected using a comprehensive procedure, measurement uncertainty was associated exclusively with the analytic methods applied. Application of statistical analyses confirmed that these results were significant at the 95% confidence level. Overall implications of these results are (1) that it is possible to eliminate uncertainty associated with material inhomogeneity and (2) that in order to reduce uncertainty, sampling procedure is very important early in the composting process but less so later in the process.

Стилі APA, Harvard, Vancouver, ISO та ін.

37

Dehaine, Q., and K. Esbensen. "Multivariate methods for improved geometallurgy sampling." TOS Forum 2022, no. 11 (May 27, 2022): 411. http://dx.doi.org/10.1255/tosf.167.

Повний текст джерела

Анотація:

Geometallurgy is at the core of life-of-mine value chain optimisation, with the aim of integrating geoscientific disciplines along with mining engineering and minerals processing. The objective is to link comprehensive geological, geochemical, mineralogical and geotechnical information with metallurgical and mining variability - based on spatially distributed samples. The spatial coverage is a crucial element in this process. Geometallurgy samples are used for metallurgical testing in the service of plant and process design and optimisation. To avoid discrepancies between the expected and actual process performance, geometallurgical test work must be based on representative samples collected and processed in compliance with the Theory of Sampling (TOS). However, even if samples are initially collected to populate a multivariate block model, most of TOS’ recommendations for estimating sampling protocols and sample representativeness is univariate. While the univariate approach is sufficient when a sample must be representative for one property only e.g., for grade estimation, it fails to properly qualify representativeness of a sample which must be representative for multiple properties such as for geometallurgical purposes. Indeed, a geometallurgy sample is considered representative sensu stricto only if its metallurgical behaviour is representative of that of the full zone of the orebody it represents. This can only be achieved if-and-when geo-metallurgical samples are representative for the full set of ore properties that influence process performance. The critical success factor of multivariate representativeness can be assessed using multivariate approaches, such as the multi-variogram, which allow us to summarise the global variability of multiple properties into a single characteristic function. This approach could be optimised by using downstream results from geo-metallurgical process modelling, to select or weight, the individual property contributions to the multi-variogram according to their importance, thereby allowing to optimise a specific geometallurgical sampling procedure in terms of sampling mode, sampling frequency and the number of increments involved according to the overall process performance.

Стилі APA, Harvard, Vancouver, ISO та ін.

38

Wahyuli, Rahmi, and Ifdil Ifdil. "Perbedaan Kejenuhan Belajar Siswa Full Day School dan Non Full Day School." Jurnal Aplikasi IPTEK Indonesia 4, no. 3 (November 13, 2020): 188–94. http://dx.doi.org/10.24036/4.34380.

Повний текст джерела

Анотація:

Penelitian ini bertujuan untuk menganalisis kejenuhan belajar siswa serta mengidentifikasi perbedaan kejenuhan belajar siswa full day school dan non full day school. Penelitian ini merupakan penelitian kuantiataif deskriptif dan komparatif. Populasi dalam penelitian ini yaitu siswa SMP Negeri 7 Padang dan siswa SMP Negeri 22 Padang 1.021 siswa, sampel penelitian ini 250 siswa dengan menggunakan teknik Purposive Sampling. Penelitian ini menggunakan instrumen Rahmi & Ifdil Kejenuhan Belajar inventori. Pengadministrasian instrumen secara online melalui google formulir kemudian dianalisis dengan menggunakan teknik analisis deskriptif dan teknik Independent Sampel Test melalui program statistik SPSS. Penelitian ini mengungkapkan bahwa kejenuhan belajar siswa full day school pada umumnya berada pada kategori sedang, kejenuhan belajar siswa non full day school pada umumnya berada pada kategori rendah, dan terdapat perbedaan yang signifikan antara kejenuhan belajar siswa full day school dan non full day school. Perlu upaya konselor untuk mengatasi kejenuhan belajar siswa agar adanya motivasi dan semangat siswa dalam belajar serta memperoleh prestasi yang baik.

Стилі APA, Harvard, Vancouver, ISO та ін.

39

Tomljenović, Antoneta, Juro Živičnjak, Andrijana Barišić, and Jadranka Akalović. "Influence of Sampling Location on Physical and Mechanical Properties of Full Grain Leather." Koža & obuća 69, no. 2 (2021): 4–11. http://dx.doi.org/10.34187/ko.69.2.1.

Повний текст джерела

Анотація:

Full grain leather refers to the strongest and most durable part of the cattle hide, consisting of the grain layer and the part of the underlying corium, and has not been sanded or buffed to remove any imperfections, that means it displays the more natural characteristics of leather. Leather quality changes with sampling location, depending on variation present in the leather fibrous structure. Leather properties were also affected by tanning and finishing processes utilized during production. Full grain leather, instead finishing, sometimes go only through an ironing process for the desired sheen is obtained. Therefore, with the purpose of analysing the influence of the leather processing level, and sampling location on their quality, in this paper, the physical and mechanical properties of differently (synthetic and chromium) tanned finished and non-finished cattle full grain leathers, sampled from the bend, shoulder and belly of side leather cuts were evaluated. Their applicability for footwear uppers were assessed by measuring leather thickness, mass per unit area, apparent density, tensile strength and percentage elongation at break, all according to the standardised test methods.

Стилі APA, Harvard, Vancouver, ISO та ін.

40

Pierri, Rocco, and Raffaele Moretta. "On the Sampling of the Fresnel Field Intensity over a Full Angular Sector." Electronics 10, no. 7 (March 31, 2021): 832. http://dx.doi.org/10.3390/electronics10070832.

Повний текст джерела

Анотація:

In this article, the question of how to sample the square amplitude of the radiated field in the framework of phaseless antenna diagnostics is addressed. In particular, the goal of the article is to find a discretization scheme that exploits a non-redundant number of samples and returns a discrete model whose mathematical properties are similar to those of the continuous one. To this end, at first, the lifting technique is used to obtain a linear representation of the square amplitude of the radiated field. Later, a discretization scheme based on the Shannon sampling theorem is exploited to discretize the continuous model. More in detail, the kernel of the related eigenvalue problem is first recast as the Fourier transform of a window function, and after, it is evaluated. Finally, the sampling theory approach is applied to obtain a discrete model whose singular values approximate all the relevant singular values of the continuous linear model. The study refers to a strip source whose square magnitude of the radiated field is observed in the Fresnel zone over a 2D observation domain.

Стилі APA, Harvard, Vancouver, ISO та ін.

41

Lin, Tao, Peijun Zhang, Shuhui Wang, Kailun Zhou, and Xianyi Chen. "Mixed Chroma Sampling-Rate High Efficiency Video Coding for Full-Chroma Screen Content." IEEE Transactions on Circuits and Systems for Video Technology 23, no. 1 (January 2013): 173–85. http://dx.doi.org/10.1109/tcsvt.2012.2223871.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

42

Meng, Xiao-Li, and Stephen Schilling. "Fitting Full-Information Item Factor Models and an Empirical Investigation of Bridge Sampling." Journal of the American Statistical Association 91, no. 435 (September 1996): 1254–67. http://dx.doi.org/10.1080/01621459.1996.10476995.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

43

Sikov, A., and J. M. Stern. "Application of the full Bayesian significance test to model selection under informative sampling." Statistical Papers 60, no. 1 (September 8, 2016): 89–104. http://dx.doi.org/10.1007/s00362-016-0828-x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

44

Colarco, P. R., R. A. Kahn, L. A. Remer, and R. C. Levy. "Impact of satellite viewing swath width on global and regional aerosol optical thickness statistics and trends." Atmospheric Measurement Techniques Discussions 6, no. 6 (November 27, 2013): 10117–63. http://dx.doi.org/10.5194/amtd-6-10117-2013.

Повний текст джерела

Анотація:

Abstract. We use the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite aerosol optical thickness (AOT) product to assess the impact of reduced swath width on global and regional AOT statistics and trends. Ten different sampling strategies are employed, in which the full MODIS dataset is sub-sampled with various narrow-swath (~400–800 km) and curtain-like (~10 km) along-track configurations. Although view-angle artifacts in the MODIS AOT retrieval confound direct comparisons between averages derived from different sub-samples, careful analysis shows that with many portions of the Earth essentially unobserved, the AOT statistics of these sub-samples exhibit significant regional and seasonal biases. These AOT spatial sampling artifacts comprise up to 60% of the full-swath AOT value under moderate aerosol loading, and can be as large as 0.1 in some regions under high aerosol loading. Compared to full-swath observations, narrower swaths exhibit a reduced ability to detect AOT trends with statistical significance, and for curtain-like sampling we do not find any statistically significant decadal-scale trends at all. An across-track sampling strategy obviates the MODIS view angle artifact, and its mean AOT converges to the full-swath mean values for sufficiently coarse spatial and temporal aggregation. Nevertheless, across-track sampling has significant seasonal-regional sampling artifacts, leading to biases comparable to the curtain-like along-track sampling, lacks sufficient coverage to assign statistical significance to aerosol trends, and is not achievable with an actual narrow-swath or curtain-like instrument. These results suggest that future aerosol satellite missions having significantly less than full-swath viewing are unlikely to sample the true AOT distribution well enough to determine decadal-scale trends or to obtain the statistics needed to reduce uncertainty in aerosol direct forcing of climate.

Стилі APA, Harvard, Vancouver, ISO та ін.

45

HAYES, B. J., I. M. MACLEOD, and M. BARANSKI. "Sampling strategies for whole genome association studies in aquaculture and outcrossing plant species." Genetics Research 91, no. 6 (December 2009): 367–71. http://dx.doi.org/10.1017/s0016672309990310.

Повний текст джерела

Анотація:

SummaryA number of farmed species are characterized by breeding populations of large full-sib families, including aquaculture species and outcrossing plant species. Whole genome association studies in such species must account for stratification arising from the full-sib family structure to avoid high rates of false discovery. Here, we demonstrate the value of selective genotyping strategies which balance the contribution of families across high and low phenotypes to greatly reduce rates of false discovery with a minimal effect on power.

Стилі APA, Harvard, Vancouver, ISO та ін.

46

Yang, Jizhong, Yunyue Elita Li, Yanwen Wei, Haohuan Fu, and Yuzhu Liu. "Full-waveform inversion with randomized space shift." Leading Edge 38, no. 3 (March 2019): 197–203. http://dx.doi.org/10.1190/tle38030197.1.

Повний текст джерела

Анотація:

Full-waveform inversion (FWI) has the great potential to retrieve high-fidelity subsurface models, with the constraint that the traveltime difference between the predicted data and the observed data should be less than half of the period at the lowest available frequency. If the above constraint is not satisfied, FWI will suffer from severe convergence problems and may get stuck in erroneous local minimum. To mitigate the dependence of FWI on the quality of the starting model, we apply the robust gradient sampling algorithm (GSA) on nonsmooth, nonconvex optimization problems to FWI. The original implementation of GSA requires explicit calculation of the gradient at each sampling point. When combined with FWI, this procedure involves tremendous computational costs for calculating the forward- and backward-propagated wavefields at each sampled velocity model within the vicinity of the current model estimate. Through numerical analyses, we find that the gradients corresponding to slightly perturbed velocity models can be approximated by space shifting the gradient obtained from the current velocity model. By randomly choosing one space shift at each time step during the gradient calculation, the computational cost is thus the same as conventional FWI. Numerical examples based on the 2004 BP model demonstrate that the proposed method can provide much better results than conventional FWI when starting from a crude initial velocity model.

Стилі APA, Harvard, Vancouver, ISO та ін.

47

Veiga-Parga, Tamara, and Christopher J. Palgrave. "Histopathology: how to get the best from gastrointestinal biopsies." Companion Animal 26, no. 3 (March 2, 2021): 43–50. http://dx.doi.org/10.12968/coan.2020.0093.

Повний текст джерела

Анотація:

Sampling of the gastrointestinal tract by endoscopic, or full thickness (open abdominal surgical) biopsy is an invaluable tool in the diagnosis and management of gastrointestinal disease in companion animals. This article gives recommendations on how to collect and submit endoscopic and full thickness biopsies of the gastrointestinal tract, in order to maximise their diagnostic value. It also covers interpretation of the histopathology report and examples of when further samplsing or additional testing may be advisable. It is important to note that these are general recommendations and it is prudent to contact the reporting laboratory with any specific queries or requests.

Стилі APA, Harvard, Vancouver, ISO та ін.

48

Tafalla, Mario, Antonio Usero, and Álvaro Hacar. "Multi-line characterization of whole molecular clouds using stratified random sampling." EPJ Web of Conferences 265 (2022): 00022. http://dx.doi.org/10.1051/epjconf/202226500022.

Повний текст джерела

Анотація:

We have developed a new technique to characterize the multi-line emission from molecular clouds using statistical sampling. Our method uses available extinction maps to select a relatively small sample of cloud positions that cover the full range of column densities in the cloud, and that can be observed with only a modest investment of telescope time. Here we present the first results of applying this technique to the Perseus molecular cloud, a nearby star-forming region that contains a population of both isolated and clustered protostars. We have used the IRAM 30m telescope to observe a sample of 100 random positions that cover two orders of magnitude in H2 column density. These positions have been observed over the full 3mm wavelength band together with selected portions of the 2 and 1mm bands. We find that the emission properties of most species are strongly correlated with the column density over the whole cloud, and that they can be reproduced using a relative simple radiative transfer model.

Стилі APA, Harvard, Vancouver, ISO та ін.

49

Kumar, Suhansanu, and Hari Sundaram. "Attribute-Guided Network Sampling Mechanisms." ACM Transactions on Knowledge Discovery from Data 15, no. 4 (June 2021): 1–24. http://dx.doi.org/10.1145/3441445.

Повний текст джерела

Анотація:

This article introduces a novel task-independent sampler for attributed networks. The problem is important because while data mining tasks on network content are common, sampling on internet-scale networks is costly. Link-trace samplers such as Snowball sampling, Forest Fire, Random Walk, and Metropolis–Hastings Random Walk are widely used for sampling from networks. The design of these attribute-agnostic samplers focuses on preserving salient properties of network structure, and are not optimized for tasks on node content. This article has three contributions. First, we propose a task-independent, attribute aware link-trace sampler grounded in Information Theory. Our sampler greedily adds to the sample the node with the most informative (i.e., surprising) neighborhood. The sampler tends to rapidly explore the attribute space, maximally reducing the surprise of unseen nodes. Second, we prove that content sampling is an NP-hard problem. A well-known algorithm best approximates the optimization solution within 1 − 1/ e , but requires full access to the entire graph. Third, we show through empirical counterfactual analysis that in many real-world datasets, network structure does not hinder the performance of surprise based link-trace samplers. Experimental results over 18 real-world datasets reveal: surprise-based samplers are sample efficient and outperform the state-of-the-art attribute-agnostic samplers by a wide margin (e.g., 45% performance improvement in clustering tasks).

Стилі APA, Harvard, Vancouver, ISO та ін.

50

Barthe, Gilles, Raphaëlle Crubillé, Ugo Dal Lago, and Francesco Gavazzo. "On Feller continuity and full abstraction." Proceedings of the ACM on Programming Languages 6, ICFP (August 29, 2022): 826–54. http://dx.doi.org/10.1145/3547651.

Повний текст джерела

Анотація:

We study the nature of applicative bisimilarity in λ-calculi endowed with operators for sampling from contin- uous distributions. On the one hand, we show that bisimilarity, logical equivalence, and testing equivalence all coincide with contextual equivalence when real numbers can be manipulated through continuous functions only. The key ingredient towards this result is a notion of Feller-continuity for labelled Markov processes, which we believe of independent interest, giving rise a broad class of LMPs for which coinductive and logically inspired equivalences coincide. On the other hand, we show that if no constraint is put on the way real numbers are manipulated, characterizing contextual equivalence turns out to be hard, and most of the aforementioned notions of equivalence are even unsound.

Стилі APA, Harvard, Vancouver, ISO та ін.

Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!