抽样定理的System View仿真与实现

通过分析SystemView仿真软件的优势及主要的功能模块库和应用领域,重点通过通信系统中的抽样定理实例介绍了该软件的使用方法及注意事项。最后,总结该软件的教学应用效果及对相关课程教学的借鉴作用,特别适合通信系统的仿真与设计。     

A characterization of exact non-atomic market games

Continuous exact non-atomic games are naturally associated to certain operators between Banach spaces. It thus makes sense to study games by means of the corresponding operators. We characterize non-atomic exact market games in terms of the properties of the associated operators. We also prove a separation theorem for weak compact sets of countably additive non-atomic measures, which is of independent interest.     

Assessing impact of regulatory risk on shareholders’ wealth

Research indicates that regulatory risk increases required return on investment by investors and causes underinvestment in industries with high sunk costs. The effects of regulatory changes may be measured by estimating the abnormal returns associated with the event. The results may suggest to regulators what should be encouraged or avoided. This article utilizes a fixed effects regression to examine abnormal returns from changes in Philippine nationalization regulations. The results are consistent with extant literature. Supreme Court decisions, which increased uncertainty and regulatory risk, produced negative abnormal returns. The initial release of draft implementing rules did not produce statistically significant effects, but a succeeding draft favouring liberalization, produced positive abnormal returns.     

Travel and tourism competitiveness index: The impact of air transportation,railways transportation,travel and transport services on international inbound and outbound tourism

The objective of the study is to examine the impact of air transportation, railways transportation, travel and transport services on international inbound and outbound tourism in a panel of 19 tourists - oriented countries, over a period of 1990–2014. By applying principal component analysis, the study constructs travel and tourism competitiveness index for inbound and outbound tourism. The main constructs of inbound tourism index include international tourists' arrival, tourism receipts, receipts of passengers' transports items and travel items while the constructs of the outbound index include international tourists' departure, tourism expenditures, and expenditures for passengers transport and travel items. The result of panel Fully Modified OLS (FMOLS) regression shows that the presence of air transportation, railways transportation, and trade openness positively affect inbound tourism index, while travel and transport services negatively affect tourism competitiveness index. The causality results confirm the bidirectional relationship between inbound tourism, air transportation, railways passengers carried, trade openness and travel and transport services, while there is a unidirectional causality running from inbound index to railway goods transported, from air transport freight to trade factor, and from travel services to air transport freight. Outbound tourism index confirmed the bidirectional causality relationship with air transportation, railways transportation, and travel and transport services, while the causality running from outbound index to trade factor, from air transport passenger carried to travel services, and from railway goods transported to trade and transport services, which support the unidirectional causality relationship between them. The variance decomposition results show that air transportation freight is the contributor that largely influences inbound-outbound tourism, while railways passengers carried and trade openness has the least share to influence inbound and outbound tourism index for the next 10-year period. The impulse response function indicates that air transportation, railways transportation, trade openness and travel services will positively impact on inbound truism while travel and transport services will positively affect outbound tourism for the next 10-year period. The study concludes with the importance of transportation sector that deem desirable to promote tourism worldwide. The concentration of different modes of transportation including air transportation, railways transportation, and travel and transport system would helpful to advance international tourism.     

A many-to-many ‘rural hospital theorem’

We show that the full version of the so-called ‘rural hospital theorem’ generalizes to many-to-many matching problems where agents on both sides of the problem have substitutable and weakly separable preferences. We reinforce our result by showing that when agents’ preferences satisfy substitutability, the domain of weakly separable preferences is also maximal for the rural hospital theorem to hold.     

用数学模型求解票据转贴现中的盈亏平衡点

近几年,票据转贴现业务在银行间市场兴起,并迅速壮大,但关于该业务的报价分析和深入研究几乎是空白。作者结合对银行资金交易的全面了解,以及工作中对票据转贴现业务的深入分析,找出对票据转贴现盈亏起决定作用的因素,进而,依据＂盈亏平衡＂理论,建立数学模型,精确推导出合理的贴现率报价,使得报价行在保证持有票据期间的期望收益率后,最大化持有期收益或最小化持有期的亏损。     

TEM4改革前后完形填空的考点效度对比分析

2005年以来英语专业四级考试完形填空试题的考点效度比以前有所提高,但句子层次考点数量仍然偏高。教师在教学过程中应注重培养学生的语篇理解能力和逻辑分析能力,提高学生的语言综合运用能力。     

点载荷作用下夹芯板局部压入响应的理论分析

夹芯结构具有质量轻、高比强度、比刚度、抗震性能好等优点,在航空航天、船舶、交通运输、建筑等行业都有着广泛的应用。在受到集中荷载作用时,夹芯结构易于产生较大的局部压入变形。本研究了夹芯板在点荷载作用下的结构响应,根据虚速度原理,得到压入载荷及结构变形随压头位移的变化关系。该研究成果可用于夹芯结构的结构设计,并为夹芯结构其它更为复杂的力学行为的研究提供参考。     

聚合信用风险模型的改进和研究

近年来的研究发现,违约损失率的分布呈现一种双峰特征。文章对传统聚合信用风险模型进行改进,用具有双峰特征的双beta分布来刻画违约损失率的变化,给出全部贷款组合信用风险概率生成函数的解析式,利用数值模拟的结果验证了模型的有效性。     

State-ownership and financial constraints on investment of Chinese-listed firms: new evidence

We examine how state-ownership affects financial constraints on investment of Chinese-listed firms during 1999–2008. We find that although an average sample firm experiences some degree of financial constraints, state-ownership does not necessarily help in reducing the firm's financial constraints on investment. Further evidence shows that state-ownership does not lead to more borrowing from the Chinese banking sector, implying that state-ownership does not necessarily reduce the firm's financial constraints via the state-controlled banking sector. We consider not only the standard factors in the investment equation, but also the firm's equity financing behaviour explicitly. The result is robust to both the conventional proxy for financial constraints, i.e. the investment–cash-flow sensitivity, and a recently developed proxy for financial constraints, i.e. the KZ index. Our results suggest that China's corporatisation movement is effective in that soft budget constraints once enjoyed by former state-owned enterprises have been removed along with the progress of corporatisation. These firms, although still state-involved, can be seen as modern corporations operating in a market environment.