水下隧道问题的边界元方法

文献[1][2]用有限元方法分别计算了水下单一隧道和双隧道的压力分布。本文用边界元方法计算了水下三隧道非对称情况下的压力分布及典型流场。计算结果符合物理规律。     

The link between intraday signals and call warrant mispricing

This study proposes a linkage between intraday variables (signal amounts and signal duration) and the mispricing of Taiwan call warrant prices, based on the lower boundary condition of Merton [1973. Theory of rational option pricing. Bell Journal of Economics and Management Science, 4(1), 141–183] as modified by Galai [1978. Empirical tests of boundary conditions for CBOE options. Journal of Financial Economics, 9(2), 321–346]. Trading mispriced call warrants associated with a riskless hedging strategy over the period January 2004–December 2005 on average produces abnormal profits after taking into account transaction costs, as indicative of an inefficient market.     

The representation of American options prices under stochastic volatility and jump-diffusion dynamics

This paper considers the problem of pricing American options when the dynamics of the underlying are driven by both stochastic volatility following a square-root process as used by Heston [Rev. Financial Stud., 1993, 6, 327–343], and by a Poisson jump process as introduced by Merton [J. Financial Econ., 1976, 3, 125–144]. Probability arguments are invoked to find a representation of the solution in terms of expectations over the joint distribution of the underlying process. A combination of Fourier transform in the log stock price and Laplace transform in the volatility is then applied to find the transition probability density function of the underlying process. It turns out that the price is given by an integral dependent upon the early exercise surface, for which a corresponding integral equation is obtained. The solution generalizes in an intuitive way the structure of the solution to the corresponding European option pricing problem obtained by Scott [Math. Finance, 1997, 7(4), 413–426], but here in the case of a call option and constant interest rates.     

联保融资的有效边界：威海钢贸企业集体违约案例

联保融资模式因为具有分散单个企业信用风险、借助其他企业信用资源绕开抵押物缺乏障碍、实现有效融资的特点,近几年被融资主体广泛采用。但该模式存在的最大缺点是其有效性受经济环境影响较大,即联保融资模式的有效性存在以行业下行信号为标志的边界。本文通过对威海某钢贸城内经营商户采用联保模式融资、因行业景气程度下降引发集体违约的案例进行描述,揭示联保融资模式信用风险分散功能在突破有效边界时从有效变为无效的根本原因,提出引入第三方担保、确保担保机构业务多元化可以在一定程度上防范联保融资模式的系统性风险。     

国家审计边界的定位：公共产品供给主体演进视角的分析

历经30多年的渐进式经济体制改革后,我国公共产品的供给主体呈现了多元化的趋势。由于政治体制改革与经济体制改革不同步,国家审计边界在制度上依然被定位于公共财政,这与不断发展创新的审计实践形成了许多内在的矛盾。为适应公共产品供给主体的多元化,国家审计边界应进行适当拓展,由现在的公共财政拓展为公共产品,与国家审计的公共受托责任及国家审计"免疫系统"功能相协调,以提高政府效率和社会管理水平、降低市场交易费用、建设服务型政府、促进社会主体间的利益和谐、实现国家善治。     

Boundary spanner turnover in professional services: Exploring the outcomes of client retention strategies

Abstract

Studies suggest that the termination of the interpersonal relationship between boundary spanners at buyer and seller firms can have a damaging effect on the inter organisational relationship. Few studies have addressed this issue in detail, but those that do, advise supplier firms to implement strategies such as service teams and boundary spanner rotation to lessen the negative effects of boundary spanner turnover. By creating multiple bonds between the two firms, dispersing client-specific knowledge widely throughout the supplier firm, and preventing the development of a close bond between buyer and seller boundary spanners, individual interpersonal relationships become less important. However, a review of relationship literature on trust, commitment, social bonds, and knowledge suggests the potential for negative outcomes from the implementation of the strategies. Using case studies and one-to-one interviews with design buyers and their agencies, this paper explores the outcomes of the two strategies, and the contexts in which these outcomes occur. Adopting a critical realist approach, findings are presented in the form of context–mechanism–outcome models. Agency size, agency culture, client experience, and boundary-spanner autonomy are amongst the contexts that influence the outcome of strategy implementation.     

企业业务接待活动中存在的问题、原因分析及对策探讨

企业作为市场经济主体,在业务招待范畴中包含了公务接待和商务接待活动。改革实践中,由于旧有观念的冲突、制度刚性约束不强等原因,接待费用失控、顶风违纪等行为在企业内部时有发生。论文总结了企业接待中容易出现的问题,并从客观与主观两方面对产生问题的原因进行分析,提出解决办法,对企业强化“三公经费”管理,落实中央八项规定精神具有一定的借鉴作用。     

员工-配偶工作家庭边界分割偏好匹配对员工工作投入的影响机制研究

依据个体-环境匹配理论和平衡理论，基于320份员工与配偶的配对问卷调查数据，采用多元回归分析、响应面分析以及块变量分析方法，探讨了员工-配偶工作家庭边界分割偏好不同匹配/不匹配类型对员工工作投入及情感平衡的影响。结果表明：员工-配偶工作家庭边界分割偏好匹配有利于提高员工的情感平衡和工作投入水平；而员工-配偶工作家庭边界分割偏好不匹配则会降低员工的情感平衡和工作投入水平。具体而言，当员工-配偶工作家庭边界分割偏好匹配时，员工边界分割偏好高-配偶边界分割偏好高对员工情感平衡和工作投入的正向影响更强；当员工-配偶工作家庭边界分割偏好不匹配时，员工边界分割偏好低-配偶边界分割偏好高对员工情感平衡和工作投入的负向影响更强。无论员工-配偶工作家庭边界分割偏好是否匹配，情感平衡均在其对员工工作投入的影响中起中介作用。     

Collaborative research on Conservation Agriculture in Bajío,Mexico: continuities and discontinuities of partnerships

Agricultural technologies are debated and contested. Studying the socio-political life of agricultural research can help us to understand why some particular technologies or pathways are favoured (and others not) and eventually why expectations are maintained or not. We studied the 30-year trajectory of practices of Conservation Agriculture in the central region of Mexico. The results of our interviews and literature review show how, over the course of time, Conservation Agriculture (CA) technology has successively changed from being referred to as Conservation Tillage, Direct Seeding, Conservation Agriculture and has now, finally become integrated within Sustainable Intensification. These changes are connected with revamped narratives and the applications of the latest research and development (R&D) paradigms. They were the result of new spaces for CA projects opening up after other spaces had closed, spaces that allowed the researchers, politicians, technicians and farmers to continue to engage in CA in a reconfigured way that fit the various agendas. The opening and closure of spaces for CA projects were the result of researchers being subject to, and taking advantage of, political changes and of politicians seeking new initiatives to support their agendas. This shows how research and politics are mutually dependent and how they generate a discontinuity of project interventions which, paradoxically, represent a continuity of agendas and research processes. As CA is both a complex and flexible technology, it has been possible to make it fit to accommodate the changing agendas of different actors.