基于决策树方法的银行客户信用评估

分析了传统银行客户信用评估方法存在的问题,针对ID3算法存在的不足,提出了一种改进的ID3算法.实验结果表明,改进后的ID3算法分类正确率有所提高,所生成的决策树较为健壮、简洁,可以减少计算代价,提高计算效率.     

3S技术在土地资源管理中的应用

"3S"技术作为当前信息管理的高新技术,在土地资源管理中具有广阔的应用前景。本文在介绍RS,GIS,GPS及"3S"集成的基础上,从土地利用调查、土地利用总体规划、土地利用动态监测、土地资源评价和土地整理五个方面简要阐述了"3S"技术在土地管理中的应用,并展望了"3S"技术在土地管理中的应用前景。     

综合孔径微波辐射探测系统仿真平台设计

由于综合孔径微波辐射探测系统在理论分析和大型阵列物理系统构建方面都十分复杂,因而仿真成为十分重要的研究手段。从系统建模、“搭积木”设计、模型/算法库设计、多级仿真设计以及体系架构等方面论述了综合孔径微波辐射探测系统仿真平台的设计,仿真内容涵盖被探测目标、环境、天线阵列、接收机通道和信号处理等。实验结果表明,该平台能正确模拟对远距空中目标的微波辐射探测,可用于综合孔径微波辐射探测理论及系统设计的研究。     

Forecasting volatility by means of threshold models

The aim of this paper is to compare the forecasting performance of competing threshold models, in order to capture the asymmetric effect in the volatility. We focus on examining the relative out‐of‐sample forecasting ability of the SETAR‐Threshold GARCH (SETAR‐TGARCH) and the SETAR‐Threshold Stochastic Volatility (SETAR‐THSV) models compared to the GARCH model and Stochastic Volatility (SV) model. However, the main problem in evaluating the predictive ability of volatility models is that the ‘true’ underlying volatility process is not observable and thus a proxy must be defined for the unobservable volatility. For the class of nonlinear state space models (SETAR‐THSV and SV), a modified version of the SIR algorithm has been used to estimate the unknown parameters. The forecasting performance of competing models has been compared for two return time series: IBEX 35 and S&P 500. We explore whether the increase in the complexity of the model implies that its forecasting ability improves. Copyright © 2007 John Wiley & Sons, Ltd.     

群速度和相速度的微机模拟

本文介绍了作者开发的群速度和相速度微机模拟软件的程序设计和实现．该软件做为演示实验已经取得了良好的效果．     

固体吸附制冷系统发生器温度场数值模拟

以内燃机排气－固体吸附制冷系统为背景，建立了固体吸附制冷系统发生器瞬态温度场数值计算模型，并讨论模型中涉及的部分物性参数。通过实验验证，该模型能较好地模拟发生器内瞬态温度场。     

复杂系统集成控制及其仿真研究

本文对于复杂系统提出一种集成控制策略,即解耦/模糊控制。并以机器人关节运动控制为例,进行仿真研究,仿真结果是令人满意的。全文包括五个部分:1.前言;2.复杂系统的解耦模型;3.复合规则库与模糊控制;4.仿真研究;5.结论。     

Li3Sn的电子和几何结构:第一原理计算

CuSn化合物在近来的锂电池负极材料研究中引起了相当的重视.使用基于混合基表示的第一原理赝势法,研究了Li插入CuSn完全替代了Cu而且占满所有间隙位置后形成的Li3Sn的电子与几何结构性质.给出了其"结构～能量"关系图,电子能带结构,电子态密度以及电荷密度分布等.     

电离层薄层倾斜带来的电离层附加时延偏差分析

在考虑电离层薄层倾斜的基础上,数值模拟、分析了电离层倾斜带来的电离层附加时延相对不考虑电离层倾斜的偏差,从而说明了在电离层倾斜地区消除电离层倾斜的必要性     

A Survey of the Use of the Discrete-event Simulation in Manufacturing Industry

In this work, a survey of companies has been produc ed from a questionnaire and in-depth inter-views. The aimof the paper is to give a current view of the use of DES (Discrete- Event Simulation) in the indust ry. The companies have been selected in a wide range in e.g. size, capital turno ver and employees. The survey was restricted to Sweden, although the results may be applicable to other countries with similar industrial structure. Some of the companies investigated are also multinational with branc...