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排序方式: 共有407条查询结果,搜索用时 15 毫秒
1.
Khalid Tauqeer Khan Abdul Nasir Ali Mazhar Adeel Adil ur Rehman Khan Atta Shuja Junaid 《Multimedia Tools and Applications》2019,78(17):24595-24615
Multimedia Tools and Applications - The world is facing many problems including that of traffic congestion. To highlight the issue of traffic congestion worldwide specially in urban areas and to... 相似文献
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Our goal is to develop a robust out-of-core sorting program for a
distributed-memory cluster. The literature contains two dominant
paradigms for out-of-core sorting algorithms: merging-based and
partitioning-based. We explore a third paradigm, that of oblivious
algorithms. Unlike the two dominant paradigms, oblivious algorithms
do not depend on the input keys and therefore lead to predetermined
I/O and communication patterns in an out-of-core setting.
Predetermined I/O and communication patterns facilitate overlapping
I/O, communication, and computation for efficient implementation. We
have developed several out-of-core sorting programs using the paradigm
of oblivious algorithms. Our baseline implementation, 3-pass
columnsort, was based on Leighton's columnsort algorithm. Though
efficient in terms of I/O and communication, 3-pass columnsort has a
restriction on the maximum problem size. As our first effort toward
relaxing this restriction, we developed two implementations: subblock
columnsort and M-columnsort. Both of these implementations
incur substantial performance costs: subblock columnsort performs
additional disk I/O, and M-columnsort needs substantial
amounts of extra communication and computation. In this paper we
present slabpose columnsort, a new oblivious algorithm that we have
designed explicitly for the out-of-core setting. Slabpose columnsort
relaxes the problem-size restriction at no extra I/O or communication
cost. Experimental evidence on a Beowulf cluster shows that unlike
subblock columnsort and M-columnsort, slabpose columnsort runs
almost as fast as 3-pass columnsort. To the best of our knowledge,
our implementations are the first out-of-core multiprocessor sorting
algorithms that make no assumptions about the keys and produce output
that is perfectly load balanced and in the striped order assumed by
the Parallel Disk Model. 相似文献
4.
M. A. Chaudhry 《Journal of Materials Science》1991,26(4):1106-1108
The dielectric response of hexagonal boron nitride has been measured perpendicular to the cleavage planes at fixed temperatures in the range up to 914 K. The frequency span lies between 10 mHz and 10 kHz range. The dielectric response consists of two loss peaks and a strong low frequency dispersion (LFD). The results are related to the movement of impurity ions. 相似文献
5.
Abdul S Chaudhry 《Journal of the science of food and agriculture》2007,87(14):2617-2624
BACKGROUND: Two factorial studies compared enzymic and in sacco methods to estimate degradation of ruminant foods. Enzyme degradation (in vitro = enzyme) was determined from the release of leucine‐equivalent amino acid (LA) crude protein (CP) from sunflower meal (SF), maize gluten meal (MG), distillers' dark grain (DG) and field beans (FB) after their separate incubations with Streptomyces griseus enzyme for 0–24 h. In sacco crude protein (CP) degradation of these foods was estimated during washing (0 h) and rumen incubations in fistulated cows for 2–24 h. The LA data were expressed as g LA per either kg of CP (LACP) or acid‐hydrolysable LA (HLA) of each food and compared with in sacco data. RESULTS: These methods showed comparable degradation with time (P < 0.01). The in sacco and HLA were greater than LACP for all foods except MG where in sacco value was either lower or equal to LACP depending upon the incubation time (P > 0.05 or P < 0.05). Conversely, HLA was significantly (P < 0.01) greater than LACP from 2 h onwards. At 0 h, in sacco values were significantly greater than those of enzyme for SF, DG and FB (P < 0.05) but not for MG. The foods differed significantly for degradation constants (a, b, c) in each method (P < 0.05). CONCLUSIONS: Despite variations between in sacco and enzyme estimates for different foods, the relationships between these estimates suggest that the HLA enzyme method has the potential to estimate food degradation. Copyright © 2007 Society of Chemical Industry 相似文献
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Ahmad Hassan Chaudhry Shafa Nayab Syed Bilal Hussain Muqarrab Ali Zhiyong Pan 《International journal of molecular sciences》2021,22(4)
The productivity of agricultural produce is fairly dependent on the availability of nutrients and efficient use. Magnesium (Mg2+) is an essential macronutrient of living cells and is the second most prevalent free divalent cation in plants. Mg2+ plays a role in several physiological processes that support plant growth and development. However, it has been largely forgotten in fertilization management strategies to increase crop production, which leads to severe reductions in plant growth and yield. In this review, we discuss how the Mg2+ shortage induces several responses in plants at different levels: morphological, physiological, biochemical and molecular. Additionally, the Mg2+ uptake and transport mechanisms in different cellular organelles and the role of Mg2+ transporters in regulating Mg2+ homeostasis are also discussed. Overall, in this review, we critically summarize the available information about the responses of Mg deficiency on plant growth and development, which would facilitate plant scientists to create Mg2+-deficiency-resilient crops through agronomic and genetic biofortification. 相似文献
8.
A series of lithium cadmium phosphate glasses having composition (mol %) xLi2O-(50 ? x)CdO-50P2O5 were prepared in a platinum crucible by the melt quenching technique. The quantity x varies in the range 0–40. The mass density and refractive index of these glasses were found in the ranges 3.95–2.89 g/cm3 and 1.55–1.40, respectively. The optical absorbance studies were also carried out on these glasses to measure their energy gaps. The absorption spectra of these glasses were recorded in the UV-visible range. No sharp edges were found in the optical spectra, which verifies the amorphous nature of these glasses. The optical band gap energies for these glasses were found to be in the range 2.58–3.5 eV. It was observed that the density, the refractive index, and the optical band gap energy decrease with increasing amount of lithium oxide. The band tailing, worked out from the Urbach plots, shows an increase with increasing Li2O content and lies in the range 0.47–0.78 eV. The absorption coefficient is observed to show an exponential dependence on the photon energy. 相似文献
9.
Rehman Hafeez Ur Ghani Anwar Chaudhry Shehzad Ashraf Alsharif Mohammed H. Nabipour Narjes 《Multimedia Tools and Applications》2021,80(11):16907-16931
Multimedia Tools and Applications - The advancement in communication and computation technologies has paved a way for connecting large number of heterogeneous devices to offer specified services.... 相似文献
10.
Tariq Junaid Armghan Ammar Ijaz Amir Ashraf Imran 《Multimedia Tools and Applications》2021,80(14):21449-21464
Multimedia Tools and Applications - The High Efficiency Video Coding (HEVC) efficiently reduces the size of the multimedia contents, but at the cost of high computation complexity. In order to make... 相似文献