随机网分形的多重分形分解

本文讨论了随机网分形的多重分形分解．计算了随机网分形上任意随机自相似测度的多重分形谱,     

SG(2,2)上布朗运动的维数性质

本文研究分形集合ＳＧ（２,２）上布朗运动的维数性质,得到了ＳＧ（２,２）上布朗运动的样本图以及象集的Ｈａｕｓｄｏｒｆｆ维数与盒维数。     

一类分形结构上的非对称随机游动

本研究一类分形结构上的随机游动,得到了它的进位不变性,进位时间的生成函数表达式并得到一个极限定理。     

随机分形

本文概括了随机分形的主要结果，综述了随机分形的最新进展和目前的动态，提出了一些末解决的问题，全文共分为三部分：（１）由随机过程和随机场（如Ｌｅｖｙ过程，Ｇａｕｓｓ场，自相似过程等）产生的各种随机分形集（如象集、水平集、Ｋ重点集等）的Ｈａｕｓｄｏｒｆｆ维数、测度和ｐａｃｋｉｎｇ维数、测试；（２）随机Ｃａｎｔｏｒ型集和统计自相似集的维数和测试；（３）分形集（如Ｓｐｉｅｒｐｉｎｓｋｉ ｇａｓｋｅｔ，ｎｅ     

概率空间上的分形性质

设（Ω,Ｆ,μ）为一概率空间,｛ｘｎ,ｎ≥１｝是定义在（Ω,Ｆ,μ）上的随机过程,Ｅ为β的任意子集,ｄｉｍμ（Ｅ）和Ｄｉｍμ（Ｅ）分别为Ｅ的Ｈａｕｓｄｏｒｆｆ和Ｐａｃｋｏｎｇ维数,若ｄｉｍμ（Ｅ）＝Ｄｉｍμ（Ｅ）,则称Ｅ是正则集。     

一类Moran测度的重分形谱

证明一类支撑在某些Moran分形上的Moran测度的重分形形式成立.     

MoranFractals的推广及其多重分形分解

本文给出Ｍｏｒａｎｆｒａｃｔａｌｓ的一个推广并且研究了其多重分形分解问题。     

Zd中离散分形指标的线性不变性质

研究欧几里得格 Zd 内离散分形指标的线性不变性质 ,即证明了上、下离散质量维数的线性不变性质 ,离散 Hausdorff维数的线性不变性质以及离散填充维数的线性不变性质 .     

分形插值函数图象的Hausdorff维数

本文给出了插值点为的分形插值函数图象的Hausdorff维数的下界估计     

稳定随机游动二重时集的离散Hausdorff维数

设（Ｘ）ｎ≥０是ｄ维格子点上相应于正则变差函数ｂ（ｎ）＝ｎ＾１／βＳ（ｎ）的稳定随机游动，称为（Ｘｎ）ｎ≥０的二重时集，时文讨论了Ａ＾ｄβ的离散Ｈａｕｓｄｏｆｒｒ维数，并且在较弱的条件下证明了：ｄｉｍＨ（Ａ＾ｄβ）（１当ｄ＞β时，２－ｄ／β当ｄ≤β时     

半直线上的独立随机环境中的随机游动

本文给出环境独立时半直线上随机游动的模型.在假定环境满足一定的条件下,证明了一个强大数定律,运用该定律讨论了过程常返性及非常返的判定.     

具阻尼的KdV—KSV方程的整体吸引子

本文证明了有阻尼的、没有Ｍａｒａｎｇｏｎｉ效应的ＫｄＶ－ＫＳＶ方程的周期初值问题存在整体吸引子,并且给出了该吸引子的Ｈａｕｓｄｏｒｆ维数和分形维数的上界估计     

稳定随机游动重点集的离散豪斯道夫维数

设是ｄ维格子点上的严格α－稳定的随机游动,称为的Ｐ重点集（Ｐ１）,本文讨论了的离散豪斯道夫维数,并对,（ａ＜ｄ）,证明了Ｐ重点集的维数都等于ａ,即     

Scenery reconstruction with branching random walk

We study the problem of scenery reconstruction in arbitrary dimension using observations registered in boxes of size k (for k fixed), seen along a branching random walk. We prove that, using a large enough k for almost all the realizations of the branching random walk, almost all sceneries can be reconstructed up to equivalence.     

Asymptotics for Random Walks with Dependent Heavy-Tailed Increments

We consider a random walk {S _n} with dependent heavy-tailed increments and negative drift. We study the asymptotics for the tail probability P{sup _n S _n >x} as x. If the increments of {S _n} are independent then the exact asymptotic behavior of P{sup _n S _n >x} is well known. We investigate the case in which the increments are given as a one-sided asymptotically stationary linear process. The tail behavior of sup _n S _n turns out to depend heavily on the coefficients of this linear process.     

Tubular recurrence

We introduce the directed-edge-reinforced random walk and prove that the process is equivalent to a random walk in random environment. Using Oseledec"s multiplicative ergodic theorem, we obtain recurrence and transience criteria for random walks in random environment on graphs with a certain linear structure and apply them to directed-edge-reinforced random walks. This revised version was published online in August 2006 with corrections to the Cover Date.     

The mean number of sites visited by a pinned random walk

This paper concerns the number Z _n of sites visited up to time n by a random walk S _n having zero mean and moving on the d-dimensional square lattice Z ^d . Asymptotic evaluation of the conditional expectation of Z _n given that S ₀ = 0 and S _n = x is carried out under 2 + δ moment conditions (0 ≤ δ ≤ 2) in the cases d = 2, 3. It gives an explicit form of the leading term and reasonable estimates of the remainder term (depending on δ) valid uniformly in each parabolic region of (x, n). In the case x = 0 the problem has been studied for the simple random walk and its analogue for Brownian motion; the estimates obtained here are finer than or comparable to those found in previous works. Supported in part by Monbukagakusho grand-in-aid no. 15540109.     

On the Fine Structure of Stationary Measures in Systems Which Contract-on-Average

Suppose {f ₁,...,f _m } is a set of Lipschitz maps of ^d . We form the iterated function system (IFS) by independently choosing the maps so that the map f _i is chosen with probability p _i ( ^m _i=1 p _i =1). We assume that the IFS contracts on average. We give an upper bound for the upper Hausdorff dimension of the invariant measure induced on ^d and as a corollary show that the measure will be singular if the modulus of the entropy _i p _i log p _i is less than d times the modulus of the Lyapunov exponent of the system. Using a version of Shannon's Theorem for random walks on semigroups we improve this estimate and show that it is actually attainable for certain cases of affine mappings of .