航材备件需求预测模型与应用研究

分析了航材消耗与需求特点,从计算航材换件次数的角度进行分析,采用简单的函数拟合算法,给出需求规律拟合公式,结合具体实例进行了器材需求预测,并给出预测。计算结果表明,计算过程简单,拟合效果较好,易于工程采用。     

苏里格气田苏54区块气水分布特征分析

在地层水化学分析、气水层的识别的基础上,对苏里格气田苏54区块气水的分布特征及分布规律开展深入研究。区块东部基本不产水,其余区域均有地层水的存在,并且在一定程度上具有连片分布的特征。2012年在东部筛选不产水的区域集中,Ⅰ+Ⅱ类井比例达到72.0%,平均无阻流量10.6×104m3/d,2口水平井试气均达百万方,开发效果良好。     

Effects of broadband availability on total factor productivity in service sector firms: Evidence from Ireland

While broadband is widely believed to augment productivity, there is little firm-level evidence of a generalised causal effect. In this paper we examine whether the introduction of digital subscriber line (DSL) broadband services increased firms' productivity in nine sub-sectors within the services and distribution sector in Ireland from 2006 to 2012. Firm-level panel data on firms' characteristics are linked to spatial information on the rollout of DSL. While we do not find significant productivity effects in the services sectors taken together, we do find positive and significant effects on firm's total factor productivity in Information & Communication and Administrative & Support Services.     

基于教务管理平台的专业分流应用系统的设计与实现

专业分流是高校教务管理工作中一项重要的、具有复杂性的工作,随着高校招生规模的不断扩大,依靠传统手工的方式完成分流工作已不能够适应新形势下对专业分流的要求,设计开发一套基于教务管理平台的专业分流系统软件是非常有必要的。本系统采用分层设计思想、应用struts2开发框架,实现网上专业志愿填报、成绩计算、志愿成绩排名、专业分流录取等功能。本文给出了专业分流系统的设计和关键代码实现。     

Gamma-Minimax Prediction for the Multinomial Distribution

Characterizations of gamma-minimax predictors for the linear combinations of the unknown parameter and the random variable having the multinomial distribution under arbitrary squared error loss are established in two situations – when the sample size is fixed and when the sample size is a realization of a random variable. It is always assumed that the available vague prior information about the unknown parameter can be described by a class of priors whose vector of first moments belongs to a suitable convex and compact set. Several known gamma-minimax and minimax results can be obtained from the characterizations derived in the present paper.     

低能见度道路交通图像清晰化方法研究

通过对低能见度情况下道路交通安全进行分析,利用暗原色先验方法对路况图像进行清晰化,并以VC++为平台开发了一套辅助驾驶员清晰识别路况的系统。实验表明,该系统具备时时性,且能获得满意的清晰图像,从而可辅助驾驶员在低能见度情况下,清晰识别路况,避免交通事故。     

电子商务环境下零售商分销渠道的选择

针对电子商务环境下的产品分销渠道,研究了由一个制造商和一个零售商组成的供应链中零售商分销渠道的选择问题。运用主从博弈和Hotelling模型,分别建立了单一线下渠道模型和在同价策略下的双渠道模型,通过对模型的分析,给出了零售商选择不同分销渠道的条件。研究表明:制造商会积极促使零售商选择线上线下双渠道;构建线上渠道的运营成本会影响零售商的渠道选择。研究结果对零售商的渠道选择有一定的指导意义。     

基于行业分布的企业网络信息安全威胁及对策研究

在互联网日益普及的今天,企业越来越重视自身的信息化建设,企业信息化的发展使得接入互联网的企业不断增长,如何保护企业信息安全成为企业发展的关键内容之一。本文采取数理统计及文本分类的方法,对来自某知名黑客论坛的300余万条数据进行分析,通过TF-IDF模型与KNN算法分类思想,得出不同行业的网络信息安全威胁程度,并划分出较低、适中以及较高三类等级。在此基础上,根据行业特点深入剖析了不同行业产生信息安全问题的原因,并提出了相应的改进措施和建议。     

Three Corrected Score Tests for Generalized Linear Models with Dispersion Covariates

We develop three corrected score tests for generalized linear models with dispersion covariates, thus generalizing the results of Cordeiro , Ferrari and Paula (1993) and Cribari-Neto and Ferrari (1995) . We present, in matrix notation, general formulae for the coefficients which define the corrected statistics. The formulae only require simple operations on matrices and can be used to obtain analytically closed-form corrections for score test statistics in a variety of special generalized linear models with dispersion covariates. They also have advantages for numerical purposes since our formulae are readily computable using a language supporting numerical linear algebra. Two examples, namely, iid sampling without covariates on the mean or dispersion parameter oand one-way classification models, are given. We also present some simulations where the three corrected tests perform better than the usual score test, the likelihood ratio test and its Bartlett corrected version. Finally, we present a numerical example for a data set discussed by Simonoff and Tsai (1994) .     

应急物流配送体系研究

分析了应急物流配送的内涵和特性,在此基础上建立了应急物流配送体系,从应急物流配送中心的建立、救灾物资配送方案的选择和物流通道的建设三个层面进行了较为深入的分析和探讨,并对配送工作的加强提出了建议。