论如何在工程投标中运用价值工程优化施工方案

在工程投标过程中,价值工程的应用越来越广泛,它对一个产品或者项目的成本、质量、工程投标等的优化有很好的应用价值。本文首先简述了价值工程的基本概念,然后分析了在工程投标中如何运用价值工程来优化施工方案。     

效用理论在飞行安全风险评估中的应用

为科学划分飞行安全风险等级,将效用理论引入飞行安全风险领域,利用效用函数,建立了飞行安全风险评估模型。在分析飞行安全风险的基础上,通过定义事故或危险事件损失效应,选取合适的效用函数进行飞行安全风险的度量。模型有效区分了类似飞行事故这样高损失、低概率事件与飞行事故征候这样低损失、高概率事件风险之间的差异,克服了期望值法的局限性。最后通过实例验证了该方法的科学性和有效性。     

市场错误定价、投资机会与并购对价方式

以我国上市公司2007年至2009年发起的并购事件为研究样本,建立二值Probit潜变量模型,利用主并公司并购前一年的股票年累积收益与并购后的投资水平分别作为市场错误定价与投资机会的替代变量,检验市场错误定价与投资机会对并购对价方式选择的影响。研究结果表明,市场错误定价与投资机会对主并公司并购对价方式的选择产生了显著影响,主并公司并购对价方式选择的市场错误定价效应与投资机会效应同时存在。     

Buffering in evacuation management for optimal traffic demand distribution

This paper presents a new framework for managing congestion during emergency evacuations. The algorithm allows a long link of the network to be used as a buffer to keep the traffic flow moving in. Concurrently, a detour trigger time is estimated to keep the traffic under-saturated in the buffer zone and minimize the total travel time. The integration algorithm presented in this paper is an efficient mathematical solution for travel time cost calculation. A case study is presented to demonstrate the efficacy of the traffic demand buffering strategy developed in this research for managing the evacuation flow.     

External Finance and the Foreign Direct Investment Decision: Evidence from Privately Owned Enterprises in China

Access to external finance is found to be a statistically significant factor explaining the probability of privately owned enterprises (POEs) in China undertaking foreign direct investment (FDI). The significance of external finance is magnified in industries featuring a heavy dependence on external finance, high technology, low tangibility, and high inventory. The external finance and FDI linkage is weaker for POEs with group affiliation, but stronger for those with generous employment welfare practices.     

Heterogeneous effect of ethnic networks on international trade of Thailand: The role of family ties and ethnic diversity

Ethnic networks have been found to have a pro-trade effect in previous research. However, the heterogeneous effect of different ethnicities is under-studied. Drawing on the literature on social structure, this paper attempts to untangle the heterogeneous effect of ethnic networks on international trade using trade data of Thailand. We found that ethnic networks have a positive impact overall on trade, confirming the results of previous studies. However, the magnitude of the positive effect varies across different ethnicities along two dimensions. First, the strength of family ties in the culture of origin accelerates the pro-trade effect of its ethnic networks, suggesting ethnicities with stronger family ties have a cultural preference for trading within their own ethnic community. In comparison, ethnic diversity weakens the positive effect of ethnic networks on trade, suggesting an informational value of diverse ethnic structure in promoting trade between different ethnicities. Our study contributes new evidence of the enduring influence of social and cultural attributes on economic activities.     

Capturing hedge fund risk factor exposures: Hedge fund return replication with ETFs

We develop a new factor selection methodology of spanning the space of hedge fund risk factors with all available exchange traded funds (ETFs). We demonstrate the efficacy of the methodology with out-of-sample individual hedge fund return replication by ETF clone portfolios. This is consistent with our interpretation of ETF returns as proxies to risk factors driving hedge fund returns. We further consider portfolios of “cloneable” and “noncloneable” hedge funds, defined as top and bottom in-sample R² matches, and demonstrate that our ETF clone portfolios slightly outperform cloneable hedge funds out of sample.     

因地制宜做好堤防防渗处理

福鼎市城关防洪堤整治工程建设过程中,为不同堤身堤基的防渗处理制定了不同的处理方案。介绍了七工膜防渗和混凝土面板防渗施工中应注意的事项及经验。     

Firm heterogeneity and location choice of Chinese Multinational Enterprises (MNEs)

Using data on 194 location choices in 32 countries for a decade, we investigated locational determinants of Chinese Multinational Enterprises (MNEs). We found that State-Owned MNEs, compared to their peers without controlling state equity, are less concerned about political risk of the host country, but more responsive to favorable exchange rate between Chinese RMB and the host currency. Strategic intent of Chinese MNEs affects their location choice in a way that manufacturing oriented investment, compared to trading subsidiaries, is more attracted to countries with large market size and more deterred by high cost structure of the host country.