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A new class of stochastic processes--Markov skeleton processes is introduced, which have the Markov property on a series of random times. Markov skeleton processes include minimal Q processes, Doob processes, Q processes of order one, semi-Markov processes , piecewise determinate Markov processes , and the input processes, the queuing lengths and the waiting times of the system GI/G/1, as particular cases. First, the forward and backward equations are given, which are the criteria for the regularity and the formulas to compute the multidimensional distributions of the Markov skeleton processes. Then, three important cases of the Markov skeleton processes are studied: the (H, G, Π)-processes, piecewise determinate Markov skeleton processes and Markov skeleton processes of Markov type. Finally, a vast vistas for the application of the Markov skeleton processes is presented. 相似文献
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利用非零和微分对策的最大值原理求解噪声依赖于(x,u,v)的随机H2/H∞控制问题,提出了该控制问题存在惟一解的一个充分必要条件,即其对应的无控制随机扰动系统的L2收益小于或等于γ。在该控制问题有解时,通过一个正倒向随机微分方程给出该控制问题的惟一解。 相似文献
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首先引入г-超半群的(m,n)超理想的概念,给出了г-超半群的(m,n)超理想的刻画和(m,n)超理想的生成表示,并利用(m,n)超理想给出(m,n)单г-超半群和(m,n)正则г-超半群的刻画。利用本文的结果,当G只有一个元素且超运算是一般的二元运算时,半群的(m,n)理想以及利用(m,n)理想对正则半群的刻画可以相应得出。 相似文献
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采用米氏光散射理论,计算了微型球腔中口哨廊模(WGMs)的场强分布.对球腔浸入不同折射率的液体介质后的场强分布,WGMs的消逝场模体积占总场模体积的比值(η值),WGMs的品质因素(Q值)等重要参数做了计算和分析.结果表明:随着球腔和环境介质相对折射率的减小,WGMs的Q值变低,η值增加.较高的η值,增加了消逝波增益耦合的耦合效率,有利于微型球腔中消逝波增益耦合的受激辐射放大过程. 相似文献
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Discrete (J, J′)-lossless factorization is established by using conjugation. For stable case, the existence of such factorization is equivalent to the existence of a positive solution of a Riccati equation. For unstable case, the existence conditions can be reduced to the existence of two positive solution of two Riccati equations. Supported by the Natural Science Foundation of Hubei Province Wang Kang: born in 1965, Ph. D. 相似文献
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本研究拟在大肠杆菌中构建光学纯(R)-乙偶姻的合成途径和利用辅酶工程调控NADH/NAD+氧化还原平衡,并对工程菌发酵(R)-乙偶姻进行优化。将来源于Enterobacter cloacae的α-乙酰乳酸合成酶基因budB、α-乙酰乳酸脱羧酶基因budA和来源于Lactobacillus brevis的NADH氧化酶基因noxE进行密码子优化后组成基因簇,构建表达质粒并导入大肠杆菌,进一步优化工程菌的培养基成分和发酵条件,提高(R)-乙偶姻的合成能力。结果表明:获得专一性合成高光学纯(R)-乙偶姻的大肠杆菌工程菌株GXASR,对其发酵条件进行系统优化后,摇瓶发酵的(R)-乙偶姻产量为36.82g/L,光学纯度达99.1%,发酵罐补料发酵的(R)-乙偶姻产量达到67.65g/L。在大肠杆菌细胞中过表达外源基因簇budB-budA-noxE能够高效合成光学纯(R)-乙偶姻,经发酵优化后,工程菌的(R)-乙偶姻产量、生产强度和得率均显著提高,为代谢工程改造大肠杆菌生产高光学纯(R)-乙偶姻提供了理论基础。 相似文献
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Measuring out successively the degree of coherence of the source produced by any couple of the small apertures via rotating an array composed of the small aperture telescopes, and synthesizing them into the (u, v) coverage of the source, the brightness distribution of the source can be obtained by the inverse Fourier transform of the degree of coherence with much higher resolution than from a single telescope. This article discusses the arrangements of the small apertures in the linear array, and found a method to decide the quality of the arrangements. the judgment factor ε is introduced to calculate the arrangements in quantity. There are 1.5×1011 possibilities for 11 apertures. Therefore, the computer procedures are programmed to select the optimum arrangements. The effect of the simulation of the aperture synthesis is given for the linear array. The simulation method can also be used in the nonlinear arrays. 相似文献
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DiscreteH ∞ control theory were obtained by conjugation, chain-scattering representation and (J, J′)-lossless factorization. The existence of the solution is equivalent to the existence of two positive solutions of two Riccati equations. Supported by the Natural Science Foundation of Hubei Province Wang Kang: born in 1965, Ph. D. 相似文献
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GAO ZhenYu LIU XiaoHui GUO LongBiao LIU Jian DONG GuoJun HU Jiang HAN Bin QIAN Qian 《科学通报(英文版)》2009,54(12):2062-2068
Rice plant architecture is an important agronomic trait that affects the grain yield. To understand the molecular mechanism that controls plant architecture, a tillering dwarf mutant with darker-green leaves derived from an indica cultivar IR64 treated with EMS is characterized. The mutant, designated as tddl(t), is nonallelic to the known tiilering dwarf mutants. It is controlled by one recessive nuclear gene, TDDL(T), and grouped into the dn-type dwarfism according to Takeda's definition. The dwarfism of the mutant is independent of gibberellic acid based on the analyses of two GA-mediated processes. The independence of brassinosteroid (BR) and naphthal-3-acetic acid (NAA) of the tddl(t) mutant, together with the decreased size of parenchyma cells in the vascular bundle, indicates that the TDDL(7) gene might participate in another hormone pathway. TDDL(T) is fine mapped within an 85.51 kb region on the long arm of rice chromosome 4, where 20 ORFs are predicted by RiceGAAS (http://ricegaas.dna.affrc. go.jp/rgadb/). Further cloning of TDDL(T) will benefit both marker assisted selection (MAS) of plant architecture and dissection of the molecular mechanism underlying tillering dwarf in rice. 相似文献
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将认知概念引入雷达电子对抗,可使干扰系统在动态对抗过程中通过自主学习,确定最具针对性的干扰策略,实现动态高效干扰.在认知雷达对抗概念和内涵讨论基础上,设计了基于Q-学习算法的雷达对抗过程,总结了认知对抗实现中的关键技术难点,最后对过程的具体实现进行了仿真,验证了雷达认知对抗中Q值的收敛过程以及先验知识对算法性能的改善情况. 相似文献
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如果Finsler空间中的测地线沿相同的路径反向也是一条测地线,则称该Finsler空间具有可反的测地线.当流形维数n2时,已刻画了具有可反测地线的(α,β)-度量,但是并没有考虑奇异的情形.无论奇异与否,当流形维数n2时,给出了具有可反测地线的(α,β)-空间的分类.进一步,也证明了可反的Finsler空间在进行了Kropina变换之后仍具有可反的测地线. 相似文献
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This article analyzes the effect of the balance of dispersion and nonlinearity on the quality of a transmission system with super Gauss pulse input by altering the input power and adding a section of dispersion compensation fiber (DCF). The same mechanisms are applied to a 2-channel wave divide multiplex system (WDM) as well. DCF is proved to be a good solution in both situations. Biography: Yan Yong-guo (1977-), male, Master candidate, Research direction: Nonlinear Optics. 相似文献
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Qixiang Yang 《科学通报(英文版)》1999,44(24):2221-2225
An atomic decomposition in Lp ( 1 <p < 2) with tent space is given. 相似文献
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研究了用于测距的被动调Q掺镱光纤脉冲激光器的输出特性,仿真对比了可饱和吸收体长度以及增益光纤长度对输出功率的影响.结果表明:在抽运源功率为5 W的条件下,输出脉冲宽度为0.8μs,脉冲峰值功率为26 W,平均功率为2 W,脉冲能量为20μJ.在物体反射率为10%,探测距离为200 m,以及大气透过率为100%的条件下,返回最小功率为3.9×10~(-7) W. 相似文献
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设G是n阶图,H是m阶图,取n个H的拷贝,并将G的第i个点和第i个H中的每一点相连(i=1,2,…,n),所得到的(n+mn)阶图称为冠图,记为GH.对基于圈和3个孤立点的冠图的Q-谱确定性(无符号拉普拉斯谱确定性),即Cn3 K1的Q-谱确定性进行了研究,证明了当n≠32,64,128时,Cn3 K1由其Q-谱确定. 相似文献
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针对金融资产未来收益的随机性,结合强化学习的原理,以Q-learning算法构造强化学习框架,来解决投资组合优化问题.采用一只股票连续数日开盘价和收盘价的涨跌幅信息作为状态,其中开盘信息在一定程度上纳入了市场消息面因素,收盘信息则直接反映股价波动情况,而连续数日的数据为模型加入了预测能力以用于指导投资.实证分析表明,投资者采用本研究方法进行投资可以得到较高且稳定的收益. 相似文献
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Zikun Wang 《科学通报(英文版)》1999,44(5):418-418
The definition of n-parameter infinite-dimensional (r,δ) -Ornstein-Uhlenbeck process {xt (·) } ((r, δ)-OUPn∞ for short) is given. The absolute continuity of distribution μt of Xt(·) and the limit of Xt(·) when |t| →∞ is discussed. 相似文献