资产证券化信用评级:国外模型方法及其借鉴

资产证券化作为金融重大创新之一,信用评级模型化分析的重点是预期损失的预测.本文通过对国外信用评级机构进行资产证券化信用评级所采用的模型方法的综合评述与研究,提出了对中国资产证券化信用评级的借鉴意义.     

Creative Destruction, Investment Volatility, and the Average Age of Capital

In this article, a new numerical procedure is used to compute the equilibrium of a vintage capital growth model with nonlinear utility, where the scrapping time is nonconstant. We show that equilibrium investment and output converge nonmonotonically to the balanced growth path due to replacement echoes. We find that the average age of capital is inversely related to output, which is consistent with recent micro evidence reinforcing the importance of the embodied question. We also find that an unanticipated permanent increase in the rate of embodied technological progress causes labor productivity to slowdown in the short run.     

Sustainable development. With or without mankind?

The author challenges the conventional wisdom that the main risk to Western development is environmental degradation caused by mankind. Concern over the greenhouse effect and global warming have more to do with millenium fever than reality. There is still very little evidence to suggest that these environmental phenomena result from human activity. What we do know is that there have been major cyclical fluctuations throughout history. The author cautions against implementing ‘scientistic’ policies in the face of such doubts, just because it is trendy to do so.     

从AutoCAD数据库生成数控加工指令的方法

AutoCAD是一个完整的交互式设计软件包,它具有很强的绘图和图形编辑功能,因而在我国机械制造业中运用十分广泛.本文介绍利用AutoCAD的数据交换文件DXF,直接从几何信息中提取加工信息的方法.     

基于AHDL扰码和解扰仿真设计

数字通信技术与EDA技术的结合是现代通信系统发展的一个必然趋势。介绍扰码和解扰的基本原理,基于AHDL语言实现了对扰码和解扰电路的设计,并在MAX PLUSII环境下对电路进行了仿真,仿真结果表明了该设计的可行性。     

会计专业实践实训教学中的问题及对策

会计实践实训教学是会计教学的重要组成部分。但目前所采用的仍主要是分课程实验、综合模拟实验和专业实习模式。但现代企业对会计人员提出了更高的要求，要求学生不仅能胜任一般的工作岗位，而且要具有思考能力、创新能力，能分析和利用已生成的会计信息积极参与企业的管理活动。实践实训教学应与专业理论教学相结合，改变单一的教学方式，强化案例教学，并积极推广多媒体教学。     

基于EM-Plant的直缝焊管生产物流系统仿真和优化

主要以焊管企业生产流程为研究对象,利用EM-Plant仿真软件进行焊管生产过程的建模与分析,识别生产过程的瓶颈,讨论作业计划的安排对生产过程的影响,以期通过调整参数达到优化生产的目的.     

基于计算机模拟的交通灯时间控制问题

文章主要讨论城市交通灯的开启时间间隔的问题，在一些假设的基础之上，把城市交通灯周期时间控制问题进行简化，目的是使得路口的日平均车流量最大。根据实际情况，给出车辆行驶的一套规则，利用计算机仿真技术进行模拟，得到最优交通灯的间隔时间。     

Exploring longitudinal risk‐return relationships

We study a longitudinal fit model of adaptation and its association with the longitudinal risk‐return relationship. The model allows the firm to adjust its position in response to partial learning about a changing environment characterized by two path‐dependent processes—a random walk and a stochastic trend. Computational simulations at low levels of learning in both environmental contexts are consistent with empirical data. However, the results are also consistent when firm behavior appears to be mindless in the form of a random walk. Hence, both imperfect learning and a mindless random walk can lead to the inverse longitudinal risk‐return relationships observed empirically. We discuss this apparent paradox and the possible resolution between mindless and conscious behavior as plausible causes of the longitudinal Bowman Paradox. Copyright © 2014 John Wiley & Sons, Ltd.     

基于Truetime工具箱的网络控制系统的仿真研究

网络控制系统(NCS)是目前网络和通信领域的研究热点,由于网络的引入,网络控制系统的仿真研究存在一定的难度。本文首先给出了NCS的定义,介绍了网络控制系统的研究现状,以及现有的网络控制系统的仿真软件,并重点介绍了Truetime工具箱。应用MATLAB和Truetime工具箱为基础,以一个三回路的网络控制系统为实例建立了Truetime仿真模型,通过仿真数据分析,验证了基于Truetime工具箱的网络控制系统模型的有效性。网络控制系统的推行,能够有效地减少人工错误,为用户节省大量时间。