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1.
得出了随机时间剩余寿命XY的随机比较性质和矩不等式.当Y是指数分布时求出了XY的故障率的界.  相似文献   

2.
故障树计算的一种新方法   总被引:1,自引:0,他引:1  
本文提出的顶事件发生概率的算法不借助割集,直接采用自顶向下的技术对故障树进行分割求解。该算法的时间和内存耗用与故障树的节点数目没有必然联系,而仅仅取决于故障树中不同的重复事件的个数。  相似文献   

3.
分次PP环的一个结论   总被引:3,自引:0,他引:3  
本文证明了Z-型分次简约环(?)是PP环(Baer环)的充要条件是R是分次PP环(分次Baer环).  相似文献   

4.
BCI-代数的Fuzzy广义结合理想   总被引:1,自引:0,他引:1  
引入了BCI-代数的fuzzy广义结合理想的概念,给出了它的一种刻画,讨论了fuzzy广义结合理想与其它fuzzy理想的关系,并利用fuzzy广义结合理想得到了拟结合BCI-代数成为结合BCI-代数的几个特征。  相似文献   

5.
6.
赵华  冯德成 《数学杂志》2002,22(2):185-190
本文引入了条件(wp),研究了其性质,建立了它与弱平坦性之间的联系,并利用其给出了某些幺半群的S-系范畴特征。  相似文献   

7.
文[l].[2]分别研究了每个次正规子群为拟正规的有限群(即(q)群)以及每个次正规子群为s—q拟正规的有限群(即(s—q)群).本文利用广幂零群的概念对(q)群与(s—q)群给出了一个新的刻划,并得到内(s—q)群的完全分类。  相似文献   

8.
利用模拟退火遗传算法实现图像阈值分割   总被引:1,自引:0,他引:1  
本文提出了一种利用模拟退火算法和遗传算法相结合的图像阈值分割算法,试验结果表明该算法增强了算法的全局收敛性,加快了算法的收敛速度,提高了图像阈值分割的效率.  相似文献   

9.
给出(S↑-)模糊积分的定义,讨论其基本性质。当模糊测度μ满足(T)条件(见命题3.3)时,可以得到,(S↑-)模糊积分的p次(S↑-)模糊可积函数空间Lp(p≥1)是实数域R上的线性空间,且当μ次可加时,Lp(p≥1)在相应的距离ρp(定义4.3)下,(Lp,ρp)构成一完备的距离空间。  相似文献   

10.
设f:XY是相对同伦满或相对同伦单.本文考虑在什么条件下,它的p局部化fp:XpYp也是相对同伦满或相对同伦单.p是素数或零  相似文献   

11.
ConcerningaKindofintegralsofComplex-ValnedFunctionsofLargeNnmbersL.C.Hsu(Dept.ofMath.Sci.,DalianUniv.ofTech,Dalian110023)Conc...  相似文献   

12.
We establish limit theorems for integrals of shot-noise processes and study the asymptotic behavior of the moments of integrals of this type.  相似文献   

13.
In this paper, we prove a central limit theorem for a sequence of multiple Skorokhod integrals using the techniques of Malliavin calculus. The convergence is stable, and the limit is a conditionally Gaussian random variable. Some applications to sequences of multiple stochastic integrals, and renormalized weighted Hermite variations of the fractional Brownian motion are discussed.  相似文献   

14.
We introduce a generated Choquet integral with respect to absolutely monotone and sign stable set functions. Another type of integrals defined with respect to such a set function is obtained as a limit of an appropriate sequence of generated Choquet integrals.  相似文献   

15.
We provide general conditions for normalized, time-scaled stochastic integrals of independently scattered, Lévy random measures to converge to a limit. These integrals appear in many applied problems, for example, in connection to models for Internet traffic, where both large scale and small scale asymptotics are considered. Our result is a handy tool for checking such convergence. Numerous examples are provided as illustration. Somewhat surprisingly, there are examples where rescaling towards large times scales yields a Gaussian limit and where rescaling towards small time scales yields an infinite variance stable limit, and there are examples where the opposite occurs: a Gaussian limit appears when one converges towards small time scales and an infinite variance stable limit occurs when one converges towards large time scales.   相似文献   

16.
On a smooth closed surface, we consider integrals of the Cauchy type with kernel depending on the difference of arguments. They cover both double-layer potentials for second-order elliptic equations and generalized integrals of the Cauchy type for first-order elliptic systems. For the functions described by such integrals, we find sufficient conditions providing their continuity up to the boundary surface. We obtain the corresponding formulas for their limit values.  相似文献   

17.
We consider an infinite-horizon optimal control problem with the cost functional described either by an integral over an unbounded interval (a Lebesgue integral) or by a limit of integrals (an improper Lebesgue integral). We prove some theorems on the existence of solutions to such problems. The proofs are based on appropriate lower closure theorems and some extensions of Olech’s theorem on the lower semicontinuity of an integral functional; these extensions cover the cases of functionals described by an integral over an unbounded interval and by a limit of integrals.  相似文献   

18.
We consider a multiple-integral representation for a one-parameter generating function of the finite temperature Sz-Sz correlation functions of the antiferromagnetic spin-1/2 XXZ chain in the XX limit and in the Ising limit. We show how the multiple integrals reduce to single integrals in these limits, thus reproducing known results. __________ Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 146, No. 1, pp. 146–160, January, 2006.  相似文献   

19.
A solution of the Cauchy-Dirichlet problem is represented as the limit of a sequence of integrals over finite Cartesian powers of the domain of the manifold considered. It is shown that these limits coincide with the integrals with respect to surface measures of Gauss type on the set of trajectories in the manifold. Moreover, the integrands are a combination of elementary functions of the coefficients of the equation considered and geometric characteristics of the manifold. Also, a solution of the Cauchy-Dirichlet problem in the domain of the manifold is represented as the limit of a solution of the Cauchy problem for the heat equation on the whole manifold under an infinite growth of the absolute value of the potential outside the domain. The proof uses some asymptotic estimates for Gaussian integrals over Riemannian manifolds and the Chernoff theorem. __________ Translated from Fundamentalnaya i Prikladnaya Matematika, Vol. 12, No. 6, pp. 3–15, 2006.  相似文献   

20.
Developments and generalizations of a theorem of Halkin, on the limit of the multiple balayage of vector integrals, are deduced via Riemann integration theory.  相似文献   

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