检索结果-南通市图书馆

L^r Convergence for B-valued Random Elements

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2012年第4期28卷 857-868页

作者： Ping Yan CHEN ding cheng WANG Department of Mathematics Ji'nan University School of Applied Mathematics University of Electronic Science and Technology of China

The paper investigates Lp convergence and Marcinkiewicz-Zygmund strong laws of large numbers for random elements in a Banach space under the condition that the Banach space is of Rademacher type p, 1 〈 p 〈 2. The paper also discusses Lτ convergence and Lτ bound for random elements without any geometric restriction condition on the Banach space.

关键词： Lτ convergence random element Rademacher type p Marcinkiewicz Zygmund stronglaw of large number

Convergence Rates for Probabilities of Moderate Deviations for Moving Average Processes

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2008年第4期24卷 611-622页

作者： Ping Yan CHEN ding cheng WANG Department of Mathematics Jinan University Guangzhou 510630 P. R. China Center of Financial Mathematics MSI Australian National University Canberra Act 0200 Australia School of Applied Mathematics University of Electronic Science and Technology of ChinaChengdu 610054 P. R. China

The present paper first shows that, without any dependent structure assumptions for a sequence of random variables, the refined results of the complete convergence for the sequence is equivalent to the corresponding complete moment convergence of the sequence. Then this paper investigates the convergence rates and refined convergence rates （or complete moment convergence） for probabilities of moderate deviations of moving average processes. The results in this paper extend and generalize some well-known results.

关键词： complete convergence complete moment convergence moderate deviation law of the iterated logarithm invariance principle moving average process

Modulo computably enumerable degrees by cupping partners

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2007年第6期50卷 899-912页

作者： Wei WANG De-cheng ding Department of Mathematics Nanjing UniversityNanjing 210093China

Cupping partners of an element in an upper semilattice with a greatest element 1 are those joining the element to 1. We define a congruence relation on such an upper semilattice by considering the elements having the same cupping partners as equivalent. It is interesting that this congruence relation induces a non-dense quotient structure of computably enumerable Turing degrees. Another main interesting phenomenon in this article is that on the computably enumerable degrees, this relation is different from that modulo the noncuppable ideal, though they define a same equivalent class for the computable Turing degree.

关键词： Turing degrees computably enumerable cupping partner 03D25

Antibacterial Effect of Cinnamon Oil Combined with Thyme or Clove Oil

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2011年第9期10卷 1482-1487页

作者： LU Fei ding Yi-cheng YE Xing-qian ding Yu-ting College of Biological and Environmental Engineering Zhejiang University of Technology Hangzhou 310014 P.R.China Department of Food Science and Nutrition Zhejiang University Hangzhou 310029 P.R.China

Antibacterial effect of cinnamon oil combined with thyme or clove oil was studied in this paper. Agar dilution method was used to determine the minimum inhibitory concentrations （MICs） of the essential oils （EOs） of cinnamon, thyme, and clove oil against three Gram-positive bacteria （Bacillus subtilis, Bacillus cereus, and Staphylococcus aureus）, and two Gramnegative bacteria （Escherichia coli and Salmonella typhimurium）. The results showed that cinnamon was a promising antibacterial substance with MIC ranged from 0.1 to 0.4 μL mL^-1 for the five bacterial species. Agar dilution checkerboard method was used to test the combined antibacterial effect of cinnamon oil with thyme or clove oil. Combination of cinnamon and thyme oil showed an additive effect against all selected bacteria, and combination of cinnamon and clove oil displayed an additive effect against B. subtilis, B. cereus, S. aureus, and an indifferent effect against E. coli and S. typhimurium. Furthermore, gas chromatography-mass spectrometry （GC-MS） measurement was used to analyze the components of the EOs, and the main components of cinnamon, thyme, and clove were cinnamaldehyde, thymol, carvacrol and p-cymene, and eugenol, respectively.

关键词： cinnamon oil antibacterial effect essential oils combination chemical components

Learning robust principal components from L1-norm maximization

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第12期13卷 901-908页

作者： ding-cheng FENG Feng CHEN Wen-li XU Tsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing 100084 China Department of Automation Tsinghua University Beijing 100084 China

Principal component analysis(PCA) is fundamental in many pattern recognition *** research has been performed to minimize the reconstruction error in L1-norm based reconstruction error minimization(L1-PCA-REM) since conventional L2-norm based PCA(L2-PCA) is sensitive to ***,the variance maximization formulation of PCA with L1-norm(L1-PCA-VM) has been proposed,where new greedy and nongreedy solutions are *** with the gradient ascent perspective for optimization,we show that the L1-PCA-VM formulation is problematic in learning principal components and that only a greedy solution can achieve robustness motivation,which are verified by experiments on synthetic and real-world datasets.

关键词： Principal component analysis(PCA) Outliers L1-norm,Greedy algorithms Non-greedy algorithms

Complete moment convergence for ND random variables under the sub-linear expectations

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2023年第3期38卷 444-457页

作者： FENG Feng-xiang WANG ding-cheng WU Qun-ying College of Science Guilin University of TechnologyGuilin 541004China School of Mathematical Science University of Electronic Science and TechnologyChengdu 611731China

In this article,we establish a general result on complete moment convergence for arrays of rowwise negatively dependent(ND)random variables under the sub-linear *** applications,we can obtain a series of results on co... 详细信息

关键词： complete convergence complete moment convergence ND random variables sub-linear expectation

Resource allocation for multiuser two-way OFDMA relay networks with user rate constraints

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2011年第3期18卷 54-61页

作者： YANG ding-cheng XU Ji-sheng HU Shu-kai School of Electronic Information Wuhan University Wuhan 430079 China The State Key Lab of ISN Xidian University Xi'an 710126 China

This paper studies the resource allocation for a multi-user two-way amplify-and-forward （AF） relay network over orthogonal frequency-division multiplexing （OFDM） technology, where all users communicate with their pre-assigned partners. Using convex optimization techniques, an optimal solution to minimize the total transmit power while satisfy each user-pair＇s data rate requirements is proposed. We divide the resource allocation problem into two subproblems：（1） power optimization within user-pair and relay in each subcarrier. （2） optimal subcarrier allocation and sum power assignment among N parallel OFDM subcarriers. Closed-form expressions of the power among user-pair and relay can be obtained in subproblem （1）, and so the proposed algorithm decreases the variable dimensionality of the objective function to reduce the complexity of this optimization problem. To solve it, a three-step suboptimal approach is proposed to assign the resources to user-pairs： Firstly, decompose each user-pair into two sub user-pairs which have one-way and two-way relaying transmission modes. Secondly, allocate the subcarriers to the new mode user-pairs and assign the transmit power to each carrier. Thirdly, distribute the assigned power to three nodes allocated in the subcarrier. Simulation results demonstrate the significant power is saved with the proposed solutions, as compared to a fixed subcarrier allocation.

关键词： resource allocation convex optimization Two-way relay amplify and forward multiuser dual decomposition orthogonal frequency-division multiplexingaccess (OFDMA)

Estimation method for parameters of overlapping nuclear pulse signal

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2017年第1期28卷 80-87页

作者： Hong-Quan Huang Xiao-Feng Yang Wei-cheng ding Fang Fang College of Nuclear Technology and Automation Engineering Chengdu University of Technology Fundamental Science on Radioactive Geology and Exploration Technology Laboratory East China Institute of Technology

Identification of nuclear pulse signal is of importance in radioactive measurements,especially in recognizing adjacent overlapping nuclear *** this article,we propose an estimation method for parameters of typical overlapping nuclear pulse ***,the nuclear pulses are regarded as individual genes and the norm is set as the fitness ***,the global optimal solution is found by searching the population of genetic algorithm,so as to estimate the parameters of nuclear *** high precision,this method can identify parameters of overlapping nuclear pulses in the Sallen-Key Gaussian signal decomposition *** pulse recognition method is of great significance to improve the precision of radioactive measurement and is suitable for serious overlap of nuclear pluses.

关键词： Nuclear pulse Overlapping Parameter identification

Variation in Yield and Physicochemical Quality Traits among Mutants of Japonica Rice Cultivar Wuyujing 3

在线全文

学校读者我要写书评

暂无评论

Rice science 2016年第1期23卷 33-41页

作者： Jose Daniel ABACAR LIN Zhao-miao ZHANG Xin-cheng ding cheng-qiang TANG She LIU Zheng-hui WANG Shao-hua ding Yan-feng College of Agronomy Nanjing Agricultural University Nanjing 210095 China Jiangsu Collaborative Innovation Center for Modern Crop Production Nanjing 210095 China

To select elite germplasms, 112 mutants derived from japonica rice cultivar Wuyujing 3 were evaluated. The yield components such as panicle number per square meter, grain number per panicle, and grain weight were measured. The quality traits such as percentage of chalky grains（PCG）, brown rice yield（BRY）, milled rice yield（MRY）, degree of milling（DM）, amylose content（AC）, protein content（PC）, and relationships among traits were inverstigated. Results showed that grain yield ranged from 2.15 to 12.49 t/hm2 with a mean of 6.4 t/hm2 and number of grains per square meter contributed for 94.64% in grain yield variation. For quality traits, all rice mutants had short size（grain length ≤ 5.5 mm） and bold shape（grain length to width ratio = 1.10-2.00）. Most of rice mutants（87.5%） had PCG values below 20%. All mutants had MRY values above 50%, AC values below 20%, and PC values below 10%. Percentage of chalky grains was significantly negatively correlated with MRY and positively correlated with DM. BRY and MRY were significantly negatively correlated with DM. PC was significantly and positively correlated with MRY and negatively correlated with DM, while AC had no significant correlation with these quality traits. It was concluded that there were 25 rice mutants which fulfilled the major requirements of Jiangsu standard japonica rice such as low percentage of chalky grains, low amylose content, optimal protein content, and which could be used as elite germplasms. Thus the mutants identified may lead to significant progress in improvement of rice quality.

关键词： japonica rice mutant yield appearance quality milling quality nutritional quality