维修备件库存的两级优化研究

针对汽车维修备件的库存储备存在配置不合理的问题,提出了一种优化方法。该方法在遗传算法的基础上,采用仿真方法建立汽车的使用可用度模型,实现备件库存配置的两级优化,并实现了在满足备件库存成本约束的前提下,使汽车的使用可用度达到最大,即修复率的最大化。给出了应用该方法的具体步骤,并通过数值分析与讨论,验证了该算法的有效性。     

Negative affectivity and workplace deviance: the moderating role of ethical climate

This study investigates (1) the relationship between employees’ trait of negative affectivity (NA) and workplace deviance and (2) the moderating role of ethical climate in the above relationship. Data was collected from 310 employees in 40 Taiwanese companies, and hierarchical linear modeling was used to test the hypotheses. Results show that NA was positively related to workplace deviance. In addition, the rules climate weakened the relationship between NA and workplace deviance, and both the instrumental climate and the caring climate strengthened the relationship between NA and workplace deviance. Managerial implications and future research directions are also discussed.     

基于BIM技术的Java二次开发及其在装饰工程设计和施工中的应用

时代的浪潮推动着各行各业的发展,对土木工程领域的建筑安全及建筑设计提出了更高的要求和标准。BIM技术应用于建筑行业(特别是装饰工程领域)已成热门应用及研究课题。BIM技术推动建筑行业从复杂化向精细化、信息化以及高效化发展。基于BIM技术,使用Java语言对工程项目进行二次开发,通过获取平面图纸的边界,自动创建初始BIM模型,筛选房间类型,进行房间装饰布置、碰撞检测、结构/参数调整以及施工管理。基于BIM技术的Java二次开发对装饰工程全寿命周期管理的应用,提高了装饰工程各个环节资源的有效利用。     

纸张复卷机的设计造型与仿真

本论文介绍了下引纸复卷机的方案,针对关键部件底辊进行了设计计算,用UG软件完成了整机三维造型,并结合3DSMAX实现了复卷过程的仿真。     

Cost-effective compensation to avoid carbon emissions from forest loss: An approach to consider price-quantity effects and risk-aversion

Analyses were carried out on financial compensation to avoid loss of tropical forests and related carbon (C) emissions when marginal financial yield declined for land-use options with extended areas, and when a risk-averting perspective (modeled according to financial theory around the capital asset pricing model) is assumed. The approach in this study was to consider natural forest, forest plantation, pasture, and cropland simultaneously to investigate how an optimized land-use distribution may reduce the amount of compensation necessary to avoid C emissions from forest loss.The financial compensations derived were as high as US$ 176 per hectare per year when comparing natural forests only with the most profitable alternative (croplands). However, compensation decreased to US$ 124 for risk-neutral decision-makers, who would strive for optimized land-use allocation, and to only US$ 47 per hectare per year for risk-avoiders, who would look to maximize the reward-to-variability ratio. Sensitivity analyses indicated that the compensation under risk-aversion increased much less than under risk-ignoring when increased productivity of agricultural land-use or growing demand for agricultural products was simulated. It was concluded that considering appropriate diversification strategies and the well documented human behavior to avoid risks is an important step in developing cost-effective compensation policies.     

Volatifity spillovers on precious metals markets and the G-7： The effects of the Asian crisis

This paper investigates the nature of volatility spillovers between stock returns and precious metals returns for the G-7 countries over the 1995-2006 period. We divide our sample into a number of sub periods, prior to, during and after the Asian crisis, with the objective to provide a wide analysis of the behaviour of these two markets taking into account the effects of the Asian crisis; We use EGARCH modelling, which takes into account whether bad news has the same impact on volatility as good news. The results show that there is no evidence of volatility persistence from stock returns to precious metals returns, but overall the results are significant in the other way around. In terms of volatility spillovers effects, the main findings are that there is evidence of volatility spill over running in a bidirectional way in almost all the cases. And finally, the results from asymmetric spillovers effects show that negative news has a stronger impact in these financial markets than positive news.     

Complex Network of Aviation E-Services in the Belt and Road Initiative: A Heuristic Study of Small Data based on Block Modeling

ABSTRACT

The aviation e-service system is an important part of support for business communication in regions covered by Belt and Road initiative. In exploring the role of airline companies in this system, we examine the structure of the network, which consists of airlines interconnections based on small data of individual attributes of aviation companies in aviation e-services, and study these interconnections across different groups using block modeling. The heuristic solution of airline companies in development of international communication and cooperation is further discussed. Among our policy implications for global managers, we suggest the enhancement of cross-regional cooperation among airlines.     

Inflation Expectations and Risk Premiums in an Arbitrage‐Free Model of Nominal and Real Bond Yields

Differences between yields on comparable‐maturity U.S. Treasury nominal and real debt, the so‐called breakeven inflation (BEI) rates, are widely used indicators of inflation expectations. However, better measures of inflation expectations could be obtained by subtracting inflation risk premiums (IRP) from the BEI rates. We provide such decompositions using an affine arbitrage‐free model of the term structure that captures the pricing of both nominal and real Treasury securities. Our empirical results suggest that long‐term inflation expectations have been well anchored over the past few years, and IRP, although volatile, have been close to zero on average.