检索结果-南通市图书馆

Dominant edge direction based fast intra mode decision in the H.264/AVC encoder

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第6期10卷 767-777页

作者： Byeongdu la Minyoung EOM Yoonsik CHOE Department of Electrical and Electronic Engineering Yonsei University

The H.264/AVC video coding standard uses an intra prediction mode with 4×4 and 16×16 blocks for luma and 8×8 blocks for chroma. This standard uses the rate distortion optimization (RDO) method to determine the best coding mode based on the compression performance and video quality. This method offers a large improvement in coding efficiency compared to other compression standards, but the computational complexity is greater due to the various intra prediction modes. This paper proposes a fast intra mode decision algorithm for real-time encoding of H.264/AVC based on the dominant edge direction (DED). The DED is extracted using pixel value summation and subtraction in the horizontal and vertical directions. By using the DED, three modes instead of nine are chosen for RDO calculation to decide on the best mode in the 4×4 luma block. For the 16×16 luma and the 8×8 chroma, only two modes are chosen instead of four. Experimental results show that the entire encoding time saving of the proposed algorithm is about 67% compared to the full intra search method with negligible loss of quality.

关键词： H 264 Intra prediction Mode decision Dominant edge direction

Roles of MEM1 in safeguarding Arabidopsis genome against DNA damage, inhibiting ATM/SOG1-mediated DNA damage response,and antagonizing global DNA hypermethylation

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2022年第1期64卷 87-104页

作者： Qianqian Wang Yumei la Huihui Xia Shaoxia Zhou Zhaoyu Zhai Honggui la College of Life Sciences Nanjing Agricultural UniversityNanjig 210095China College of Plant Protection Nanjing Agricultural UniversityNanjig 210095China College of Artificial Intelligence Nanjing Agricultural UniversityNanjig 210095China

Arabidopsis methylation elevated mutant 1(mem1)mutants have elevated levels of global DNA methylation. In this study, such mutant alleles showed increased sensitivity to methyl methanesulfonate(MMS). In mem1 mutants, an assortment of genes engaged in DNA damage response(DDR), especially DNA-repair-associated genes, were largely upregulated without MMS treatment, suggestive of activation of the DDR pathway in them. Following MMS treatment, expression levels of multiple DNArepair-associated genes in mem1 mutants were generally lower than in Col-0 plants, whichaccounted for the MMS-sensitive phenotype of the mem1 mutants. A group of DNA methylation pathway genes were upregulated in mem1 mutants under non-MMS-treated conditions, causing elevated global DNA methylation, especially in RNAdirected DNA methylation(Rd DM)-targeted ***, MEM1 seemed to help ATAXIATElaNGIECTASIA MUTATED(ATM) and/or SUPPRESSOR OF GAMMA RESPONSE 1(SOG1) to fully activate/suppress transcription of a subset of genes regulated simultaneously by MEM1 and ATM and/or SOG1, because expression of such genes decreased/increased consistently in mem1 and atm and/or sog1 mutants, but the decreases/increases in the mem1 mutants were not as dramatic as in the atm and/or sog1 mutants. Thus, our studies reveals roles of MEM1 in safeguarding genome, and interrelationships among DNA damage, activation of DDR, DNA methylation/demethylation, and DNA repair.

关键词： ATM cell death DDR DNA demethylation DNA methylation DNA repair MEM1 MMS SOG1 ROS1

Relationship between MODIS-NDVI data and wheat yield: A case study in Northern Buenos Aires province, Argentina

在线全文

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2015年第2期2卷 73-84页

作者： Mariano F.Lopresti Carlos M.Di bella Américo J.Degioanni Instituto Nacional de Tecnología Agropecuaria(INTA) EEA PergaminoRuta 32 km 4.5Pergamino 2700Buenos AiresArgentina INTA-Castelar CNIAInstituto de Clima y AguaLas Cabanas y Los Reseros S/NHurlingham 1686Buenos AiresArgentina UNRC Facultad de Agronomía y VeterinariaDepartamento de Ecología AgrariaRuta Nacional 36 km 601Río Cuarto 5800Co´rdobaArgentina CONICET–Consejo Nacional de Investigaciones Científicas y Técnicas Argentina

In countries like Argentina,whose economy depends heavily on crop production,the estimation of harvests is an elementary *** providing objectivity,the use of remote sensing allows estimating yield in *** the time of maximum leaf area in wheat corresponds with the critical period of the crop,a good relationship is expected between the Normalized Difference Vegetation Index(NDVI)and *** present study was carried out in the North of Buenos Aires province,*** on the type of soil,the study area can be divided into two homogeneous subzones:a subzone with lower clay content in the southwestand a subzone with higher clay content in the *** growing seasons(2003–2011)were *** the first five years,an empirical model was calibrated and validated with field-observed wheat yields and MOD13q1 product-NDVI data,whereas in the other four years,the calibrated model was applied by means of yield maps and by comparing with official *** MOD13q1 image corresponding to Julian day 289 showed the best fit between NDVI and yield to estimate wheat yield *** yield maps,better weather conditions showedhigher yields and higher soil productivity presented a greater proportion of the area occupied by higher *** department level,an R2 value of 0.75 was found after relating the estimation of the calibrated empirical model with official *** method used allows predicting wheat yield 30 days before *** yield maps,the NDVI perceived the temporal and spatial variability in the study area.

关键词： Remote sensing Wheat NDVI Yield Empirical models MODIS

Searching for alternatives to brain regeneration

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2021年第11期16卷 2198-2200页

作者： Chiara la Rosa Luca Bonfanti Neuroscience Institute Cavalieri Ottolenghi(NICO) OrbassanoItaly Department of Veterinary Sciences University of TurinGrugliascoItaly

Brain regeneration from an evolutionary perspective:Brain regeneration(the full restoration of tissue after loss from injury or disease)is the most sought after goal for researchers working in developmental *** also appears to be the most challenging to achieve when considering the mammalian *** remarkable regenerative capacities can be present in the central nervous systems of many non-mammalian vertebrates(e.g.,fish,amphibians),these kinds of processes appear to be dramatically reduced in mammals(Bonfanti,2011).

关键词： regeneration sought injury

Effect of dietary magnolia bark extract supplementation in finishing pigs on the oxidative stability of meat

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2023年第1期14卷 200-211页

作者： Ruggero Menci Hajer Khelil‑Arfa Alexandra Blanchard Luisa Biondi Marco bella Alessandro Priolo Giuseppe Luciano Antonio Natalello Dipartimento Di Agricoltura Alimentazione e Ambiente(Di3A)University of CataniaVia Valdisavoia 595123 CataniaItaly. Pancosma ADM A One Business Center1180 RolleSwitzerland.

Background:Magnolia bark extract(MBE)is a natural supplement with antioxidant,anti-inflammatory,and antimicrobial *** properties suggest that the dietary supplementation in livestock could improve the quality of ***,the aim of this study was to investigate,for the first time,the effect of dietary MBE supplementation(0.33 mg/kg)in finishing pigs on the oxidative stability of *** stability is of paramount importance for pork,as it affects storage,retail,and consumer *** the purpose,the fatty acid profile,cholesterol,fatsoluble vitamins,antioxidant enzymes(catalase,glutathione peroxidase,and superoxide dismutase),non-enzymatic antioxidant capacity(TEAC,FRAP,and Folin-Ciocalteu assays),color stability,and lipid stability of pork were ***:Concerning carcass characteristics,dietary MBE did not affect cold carcass yield,but reduced(P=0.040)the chilling weight *** meat from pigs fed MBE had a lower(P=0.031)lightness index than the control *** effect on intramuscular fat,cholesterol,and fatty acid profile was *** MBE did not affect the content of vitamin E(α-tocopherol andγ-tocopherol)in pork,whereas it reduced(P=0.021)the retinol *** catalase activity was 18%higher(P=0.008)in the meat from pigs fed MBE compared with the control *** MBE supplementation reduced(P=0.039)by 30%the thiobarbituric acid reactive substances(TBARS)in raw pork over 6 d of aerobic refrigerated ***,no effect on lipid oxidation was observed in cooked ***,the meat from pigs fed MBE reduced Fe3+-ascorbate catalyzed lipid oxidation in muscle homogenates,with a lower(P=0.034)TBARS value than the control group after 60 min of ***:Dietary MBE supplementation in finishing pigs delayed the lipid oxidation in raw *** effect was combined with an increased catalase *** results suggest that dietary MBE could have implications for improving the shelf-life of pork

关键词： Antioxidant capacity Antioxidant enzyme Color Fatty acid Lipid oxidation Plant extract Pork Shelf-life TBARS Vitamin

Algebraic Properties of Universal Squarefree Lexsegment Ideals

在线全文

学校读者我要写书评

暂无评论

Algebra Colloquium 2016年第2期23卷 293-302页

作者： Marilena Crupi Monica la Barbiera University of Messina Department of Mathematics and Computer Science Viale Ferdinando Stagno d'Alcontres 31 98166 Messina Italy

Let K be a field and let A = K[X1,...,Xn] be the polynomial ring in X1, ..., Xn with coefficients in K. In this paper we study the universal squarefree lexsegment ideals, and put our attention on their combinatorics computing some invariants. Moreover, we study the link between such a special class of squarefree lexsegment ideals and the so-called s-sequences.

关键词： monomial ideals squarefree lexicographic ideals minimal resolutions s-sequences standard invariants

Low Dimensional Cohomology of Hom-Lie Algebras and q-deformed W(2, 2) Algebra

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2014年第6期30卷 1073-1082页

作者： la Mei YUAN Hong YOU Science Research Center Academy of Fundamental and Interdisciplinary SciencesHarbin Institute of Technology School of Mathematical Sciences Suzhou University

This paper aims to study low dimensional cohomology of Hom-Lie algebras and the qdeformed W（2, 2） algebra. We show that the q-deformed W（2, 2） algebra is a Hom-Lie algebra. Also,we establish a one-to-one correspondence between the equivalence classes of one-dimensional central extensions of a Hom-Lie algebra and its second cohomology group, leading us to determine the second cohomology group of the q-deformed W（2, 2） algebra. In addition, we generalize some results of derivations of finitely generated Lie algebras with values in graded modules to Hom-Lie *** application, we compute all αk-derivations and in particular the first cohomology group of the q-deformed W（2, 2） algebra.

关键词： Hom-Lie algebras q-deformed W(2 2) algebra derivation second cohomology group first cohomology group

Potential of GSHP coupled with PV systems for retrofitting urban areas in different European climates based on archetypes definition

在线全文

学校读者我要写书评

暂无评论

Energy and Built Environment 2024年第3期5卷 374-392页

作者： laura Carnieletto Antonino Di bella Davide Quaggiotto Giuseppe Emmi Adriana Bernardi Michele De Carli Department of Industrial Engineering–DII University of Padovavia Venezia 1PadovaItaly University of Ferrara Italy CNR–National Research Council PadovaItaly

According to the recent policies regarding energy use in buildings and the need of retrofit strategies,the aim of this work is to support policies concerning the installation of ground source heat exchangers in urban and historical areas,raising the awareness on the potential energy saving achievable with optimal sizing and limited impact on the urban *** have been developed distinguishing among existing and historic buildings,focusing on single-family terrace houses,which are the typical residential buildings in European historic centres.A methodology for the optimal sizing of ground source heat pumps,eventually considering dual-source system or air system has been developed combining simulations of a photovoltaic system to estimate the self-sufficiency and the self-consumption for five orientations of the *** results have been obtained for warm cli-mates,with negligible heating energy demand and possibly free cooling systems rather than traditional cooling systems needed in *** temperature was acceptable despite unbalanced energy *** proper inclination,photovoltaic systems could provide up to 40%of self-sufficiency share also in northern *** energy-economic analysis was carried out obtaining a variety of cases representing a general overview of the European building stock and the potential benefits achievable in terms of renewable energy share,energy savings and economic investments needed to be extended to simulations at urban scale.

关键词： Energy use database Ground source heat exchangers Urban context Energy retrofit Integrated renewables

Biderivations of Hom-Lie Algebras and Superalgebras

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2024年第10期40卷 2337-2358页

作者： la Mei YUAN Jia Xin LI School of Mathematics Harbin Institute of TechnologyHarbin 150001P.R.China

On Hom-Lie algebras and superalgebras,we introduce the notions of biderivations and linear commuting maps,and compute them for some typical Hom-Lie algebras and superalgebras,including the q-deformed W(2,2)algebra,the... 详细信息

关键词： Hom-Lie algebras biderivations linear commuting maps q-deformed W(2,2)algebra q-deformed Witt algebra q-deformed Witt superalgebra