旅游原理基本命题研究

旅游并非自古就有,只有在市场经济发展到一定阶段才会产生。旅游现象表现为“经济外壳”和“文化内核”,由此导致经济和文化两类关系和现象。这些现象交叉、重叠、遮蔽并反映在社会综合现象中,从中揭示各种现象的内在联系、结构、形态。     

科技型人才聚集效应的经济学分析

本文认为,科技型人才聚集现象是科技型人才流动的产物,科技型人才聚集现象发生质变时就会产生科技型人才聚集效应。科技型人才聚集效应是人才聚集效应的一种特殊形式,除了具备人才聚集效应的诸多特征外,还有其自身特点。文章提出,科技型人才流动的动因有引致性动因和驱致性动因两种,要形成人才聚集现象进而实现人才聚集效应必须同时提升这两个方面的水平。而科技型人才聚集效应边界的存在则需要地区或企业严格控制好科技型人才聚集度,使之处于最优点以保障经济水平快速有效的增长。     

从股票发行与上市价格的影响因素看我国股市IPO抑价现象的原因

目前,在我国股票市场上一直存在着新股发行价低于上市价格的抑价现象,其主要原因是股市发行与交易市场参与者之间信息不对称。应加速完善上市公司信息披露机制,提高信息的真实性、及时性以及投资行为的理性化程度,借助信息和资金优势带动股票市场价格保持在合理且相对平稳的范围内。只有这样,股票市场价格才会更加清晰的反映出公司实际投资价值,发行价与上市价间的差距也会逐步降低。     

How to inhibit a partner's strong and weak forms of opportunism: Impacts of network embeddedness and bilateral TSIs

This study investigates the moderating effects of a firm's network embeddedness and a partner's transactional specific investments (TSIs) on relationships between the firm's TSIs and its partner's strong- and weak-form opportunism, and compares the efficiency among these moderator variables. The regression results suggest that (1) a firm's TSIs are positively related to partner's opportunism when network embeddedness and the partner's TSIs are relatively low; but (2) a firm's TSIs are negatively related to partner's opportunism when network embeddedness and the partner's TSIs are relatively high. Furthermore (3) network embeddedness is more effective in inhibiting partner's weak-form opportunism than in inhibiting strong-form opportunism resulting from the firm's TSIs. Finally (4) with regard to the relationship between TSIs and weak-form opportunism, the negative moderating effect of network embeddedness is greater than the negative moderating effect of partner's TSIs. This study explains reasons why conflicting views exist about the relationship between TSIs and partner's opportunism, reveals the differences in the moderating effects of network embeddedness and partner's TSIs, and makes new contributions to both transaction cost theory and embeddedness literature. It also provides, for firms involved in TSIs in a buyer–supplier relationship, insightful managerial suggestions about ways to reduce their partner's varying forms of opportunism.     

银行业:收益、股价及投资价值的比较分析

近年来,我国股票市场出现了一个奇异现象,即银行板块业绩优异,但其股价却严重偏离其价值。研究表明,出现这一奇特现象,不是因为该行业的股票盘子大,也不是因为政府融资平台和房地产泡沫等问题的存在导致该行业风险大,而是因为银行股波动性小,同时,也是因为相对来说我国上市公司中银行业经营管理规范、稳健,没有太多可炒作的题材,因此不受市场的投机性资金追捧。     

Information in generalized method of moments estimation and entropy-based moment selection

In this paper, we make five contributions to the literature on information and entropy in generalized method of moments (GMM) estimation. First, we introduce the concept of the long run canonical correlations (LRCCs) between the true score vector and the moment function f(_vt,_θ0)$f(v_t,{\theta }_0)$ and show that they provide a metric for the information contained in the population moment condition E[f(_vt,_θ0)]=0$\mathrm{E}[f(v_t,{\theta }_0)]=0$. Second, we show that the entropy of the limiting distribution of the GMM estimator can be written in terms of these LRCCs. Third, motivated by the above results, we introduce an information criterion based on this entropy that can be used as a basis for moment selection. Fourth, we introduce the concept of nearly redundant moment conditions and use it to explore the connection between redundancy and weak identification. Fifth, we analyse the behaviour of the aforementioned entropy-based moment selection method in two scenarios of interest; these scenarios are: (i) nonlinear dynamic models where the parameter vector is identified by all the combinations of moment conditions considered; (ii) linear static models where the parameter vector may be weakly identified for some of the combinations considered. The first of these contributions rests on a generalized information equality that is proved in the paper, and may be of interest in its own right.     

《塑料成型工艺与模具设计·“干涉”现象》项目教学设计

本文通过分析《塑料成型工艺与模具设计》课程专业背景和课程地位,确定了《"干涉"现象》教学项目的教学目标,通过精心的教学设计和实施达到以能力培养为目的,以学生为主体,以训练项目为驱动较好地提升学生发现问题、解决问题的能力,合理进行模具设计的目的。     

Impatience implication of weakly Paretian orders: Existence and genericity

We study order theoretic and topological implications for impatience of weakly Paretian, representable orders on infinite utility streams. As a departure from the traditional literature, we do not make any continuity assumptions in proving the existence of impatient points. Impatience is robust in the sense that there are uncountably many impatient points. A general statement about genericity of impatience cannot be made for representable, weakly Paretian orders. This is shown by means of an example. If we assume a stronger sensitivity condition, then genericity obtains.