麦积山石窟寺环境景观价值及保护策略

深入挖掘麦积山石窟寺环境景观的原始设计意匠 ,从崖体形貌、环境空间模式以及中国传统风水理论 3个方面 ,揭示麦积山石窟寺独特的环境景观价值 ,指出其环境景观价值是整体文物价值不可分割的组成部分。在此基础上 ,强调文物及其环境应该进行整体保护 ,并简述了相应的保护策略 :对现有环境景观进行整治 ,全面展现麦积山石窟寺的珍贵价值。此保护策略贯彻了将环境景观与文物本体的保护置于同等地位的文保意识和操作理念     

Parametric estimation for ARFIMA models via spectral methods

Given a fractional integrated, autoregressive, moving average,ARFIMA (p, d, q) process, the simultaneous estimation of the short and long memory parameters can be achieved by maximum likelihood estimators. In this paper, following a two-step algorithm, the coefficients are estimated combining the maximum likelihood estimators with the general orthogonal decomposition of stochastic processes. In particular, the principal component analysis of stochastic processes is exploited to estimate the short memory parameters, which are plugged into the maximum likelihood function to obtain the fractional differencingd.     

P_k(t)公式的一个证明

本文由指数函数的特性直接推导P_0(1)公式;在详细讨论种种可能情况及相互关系的基础上;利用微分方程法得到k≥1时的证明。     

Limit theorems for a general weighted process under random censoring

Necessary and sufficient conditions for weak and strong convergence are derived for the weighted version of a general process under random censoring. To be more explicit, this means that for this process complete analogues are obtained of the Chibisov-O'Reilly theorem, the Lai-Wellner Glivenko-Cantelli theorem, and the James law of the iterated logarithm for the empirical process. The process contains as special cases the so-called basic martingale, the empirical cumulative hazard process, and the product-limit process. As a tool we derive a Kiefer-process-type approximation of our process, which may be of independent interest.     

政府投资项目虚拟集成化管理模式构建

分析了中国政府投资项目管理存在的问题,提出目前试行的项目管理模式的弊端。针对中国特点,提出了改进政府投资项目管理应当构建一个虚拟集成化管理系统(IOGV)的设想:即构建政府投资工程项目虚拟联盟(VOGP)和政府投资工程项目集成化管理信息系统(IISG)。分析了在此模式下项目管理的运作过程及优势。     

AN ALGORITHM FOR THE DESIGN OF 2? FACTORIAL EXPERIMENTS ON CONTINUOUS PROCESSES

Saunders & Eccleston (1992) presented an approach to the design of 2-level factorial experiments for continuous processes. It determined sets of contrasts between the observations that could be well estimated, and then selected a design so that those contrasts estimated the parameters of interest. This paper shows that a well-estimated contrast must have a large number of changes of sign or level, and also be ‘paired’ in a particular sense. It develops an algorithm which constructs designs that must have a large number of changes of sign, evenly spread among the contrasts and optimal or near optimal. When such designs exist they are often preferable to those produced by the reverse foldover algorithm of Cheng & Steinberg (1991).     

计算机集成制造与成组技术

成组技术(GT)和计算机集成制造(CIM)是两种改变传统的机械制违中多品种、小批量制造企业落后面貌的先进技术和方法。本文探讨了这两种技术之间的关系,着重说明以下问题:GT通过对系统的简化而成为CIM的基础;以CIM思想为指导开发GT系统,不仅可取得较好的近期效益,而且随着企业计算机应用水平的提高,可在GT系统的基础上建立起CIM系统。本文最后对一个实际工厂目前正在实施的GT系统和正在规划的CIM系统的关系作了探讨。     

AN ALGORITHM FOR CHOOSING THE SAMPLING TIMES FOR AN EXPERIMENT ON A CONTINUOUS PROCESS

Saunders & Eccleston (1992) and Saunders, Eccleston & Spessa (1992) developed an approach to the design of factorial experiments on continuous processes that allows for the correlation present in such processes. Their methods concentrated on identifying the order of application of treatments in such experiments, assuming that the spacing between experiments is constant. On a continuous process, there is no necessity to maintain equally spaced sampling times. This paper gives an algorithm for choosing the optimal sampling times for a factorial experiment aimed at estimating a particular parameter or set of parameters. It is shown that in practical situations the optimal sampling times give considerable improvements in the accuracy of the parameter estimates.     

综合业务CATV网络

本文提出了一种宽带分布式网络设计,该网络能在CATV电缆上同时进行数据、实时数字话音及模拟电视通信。本系统能支持大量用户间的通信。由于采用了宽带技术和总线网令牌与CSMA/CD的混合协议,从而解决了局域网所面临的距离和时延问题。本文最后对所提出网络的话音性能作了评估,所得结果与相关试验报导数据相符。     

中国大陆幼儿园统整课程的理念与设计--以重庆市幼儿园为例

本研究以中国大陆重庆市幼儿园作为脉络,探讨了幼儿园统整课程的涵义、理论基础与设计,提出幼儿园统整课程目标旨在增进幼儿真正了解自己及其世界,积极主动地参与实践,并把所学知识用以解决实际问题;在课程内容上,强调与幼儿的真实生活与社会经验相结合,根据幼儿的年龄特点与身心发展水平设计课程,并注重课程之间的统整性、综合性;在课程的组织上,强调教师的引导作用,幼儿是主动积极的学习者,教师与幼儿之间是平等的合作关系;课程评价方式上强调多元化、弹性化,采用多种评价方式,培养幼儿的自主性、独立性和创造性,以促进幼儿的全面发展.