六西格玛呼唤管理“软”环境

六西格玛管理在GE的成功运用。受到学术界与企业界的广泛关注，被喻为韦尔奇的“制胜法宝”。我国许多企业也争相研究这一管理模式，但是六西格玛不仅仅是一个管理工具，更重要的是一种管理理念，中国企业如果要推行六西格玛管理，需要首先塑造与之相适应的“软环境”。     

随机存货决策中的安全库存研究

在有短缺成本下 ,讨论了再定购点的确定 ,着重分析了安全库存的一种简易计算。     

拖拉机总装流水线的时间平衡

本文联系拖拉机总装配的实际,阐述了装配线时间平衡的做法及其所可取得的显著的经济效益。     

The approach to transforming the traditional agricultural economy: a research on the multiple paths of poverty alleviation and transformation in rural China

Transforming a traditional agricultural economy into a modern economy is one of the main themes in economic development. Through theoretical and empirical analysis, this paper finds out that the key to transformation is to raise the economic value of people, to improve human capital investment and to match the stocks of physical and human capital. China’s rural economy is on the edge of economic take-off, and different zones may pursue different paths for transformation. The source of rural poverty is not the scarcity of income or consumption, but the deficiency of education, social security, medical care and economic opportunity, which we define as “capability poverty”. __________ Translated from The Journal of World Economy (世界经济), 2005,(2) (in Chinese)     

Improved estimation of portfolio value‐at‐risk under copula models with mixed marginals

Portfolio value‐at‐risk (PVAR) is widely used in practice, but recent criticisms have focused on risks arising from biased PVAR estimates due to model specification errors and other problems. The PVAR estimation method proposed in this article combines generalized Pareto distribution tails with the empirical density function to model the marginal distributions for each asset in the portfolio, and a copula model is used to form a joint distribution from the fitted marginals. The copula–mixed distribution (CMX) approach converges in probability to the true marginal return distribution but is based on weaker assumptions that may be appropriate for the returns data found in practice. CMX is used to estimate the joint distribution of log returns for the Taiwan Stock Exchange (TSE) index and the associated futures contracts on SGX and TAIFEX. The PVAR estimates for various hedge portfolios are computed from the fitted CMX model, and backtesting diagnostics indicate that CMX outperforms the alternative PVAR estimators. © 2006 Wiley Periodicals, Inc. Jrl Fut Mark 26:997–1018, 2006     

路过天空——深圳航空平面广告创意手记

曾经读过泰戈尔的这句“天空没有翅膀的痕迹，而我已飞过”。无奈地承认，这曾是对天空最美丽的想象。不过生存要继续。2006，深航，我们要继续为它构筑在天空的远大版图。 航空业显然是不轻松的，高风险低回报，加之油价上涨、外航潜人、国内航空公司3＋X竞争局面的加剧…在高度发展的商业社会中，天空中也有狭路相逢之时。     

东北亚区域经济合作与中小企业

随着区域经济一体化的迅速发展，中小企业在东北亚区域经济合作中正发挥着日益重要的作用。     

The mean-variance investment problem in a constrained financial market

This paper extends the mean-variance analysis and the two-fund separation theorem to a market with some constraints, such as, the incompleteness, prohibition of short-selling, and partial information, with stochastic interest rate, and with stochastic volatility for risky assets. By maximizing a quadratic utility of terminal wealth, we show that the efficient frontier for the problem is a straight line in the mean-standard-deviation diagram. The quadratic utility function exhibits mean-variance efficiency. Our results apply to portfolios of claims in a single period, multiperiod, and continuous time.     

当前农业形势分析与对策

今年以来,全国各地认真贯彻落实中央农村工作会议、中央1号文件精神,紧紧围绕建设现代农业,扎实推进新农村建设,使农业和农村经济稳步发展.     

建设完善的国内宽带网络 提高技术支撑能力

一．着眼业务需要建设新华社国内宽带网 环顾当今世界，信息爆炸式增长，以通信和网络为主要代表的信息技术突飞猛进，信息技术创造了网络媒体，引发了人类信息获取手段的革命，给传统媒体产业带来了巨大挑战，技术支撑能力已经提升为通讯社核心竞争力中至关重要的组成部分。