A MULTIFACTOR GAUSS MARKOV IMPLEMENTATION OF HEATH, JARROW, AND MORTON

Working within the Heath-Jarrow-Morton framework and using the theory of stochastic equations in infinite dimensions, a useful multifactor Gauss-Markov model for the movement of the whole of the yield curve is derived. Swaptions are priced. They are hedged by eliminating random terms between the semimartingale representations of the swaption and hedging instruments. Hedging efficiency is analyzed. the model is fitted to the swap/cap strips in Australia. Computation times on a 20-MHz laptop computer are acceptable.     

Capital structure and cost efficiency in the Taiwanese banking industry

By utilizing a sample of 44 Taiwanese banks, this study analyses whether banks can mitigate agency costs, to increase firm performance through optimization of capital structure. The stochastic frontier approach is adopted to determine cost efficiency as the firm performance indicator, an approach that is capable of controlling outside environmental factors. Furthermore, this study uses two-stage least squares to estimate two simultaneous equations that are then used to examine the relationship between capital structure and firm performance. This study includes indicators of ownership structure. The main results are: first, optimal capital structure is selected by the manager to combat the agency problem and thus improve performance, yielding results consistent with agency theory; and second, reducing managerial share ownership will decrease agency cost and increase firm performance, a finding that is consistent with the Entrenchment Hypothesis.     

中频PCM/FM信号全软化FM解调的一种实现方法

本文介绍了中频PCM/FM信号全软化FM解调系统的组成、解调原理及软件解调的一种实现方法,完成了对软件解调算法的理论阐述和数学推导,并根据推导出的数学模型在Matlab平台下进行软件设计,最后进行了仿真测试和实验验证,仿真结果和实验结果证明了该实现方法的可行性。     

THE 4/2 STOCHASTIC VOLATILITY MODEL: A UNIFIED APPROACH FOR THE HESTON AND THE 3/2 MODEL

We introduce a new stochastic volatility model that includes, as special instances, the Heston (1993) and the 3/2 model of Heston (1997) and Platen (1997). Our model exhibits important features: first, instantaneous volatility can be uniformly bounded away from zero, and second, our model is mathematically and computationally tractable, thereby enabling an efficient pricing procedure. This called for using the Lie symmetries theory for partial differential equations; doing so allowed us to extend known results on Bessel processes. Finally, we provide an exact simulation scheme for the model, which is useful for numerical applications.     

Market orientation, knowledge-related resources and firm performance

Based upon new perspectives to explain superior business performance, an integrative conceptual model that links these different explanations of superior performance is presented, highlighting the role of knowledge-related resources as key antecedents of the continuous creation of competitive advantages (Day 1994, Day George S. The capabilities of market-driven organizations. J Mark 1994a, 58 [October]: 37-52., Day George S. Continuous learning about markets. Calif Manage Rev 1994b, 36 [Summer]: 9-31., Hunt and Morgan, 1995, Hunt Shelby D., Morgan Robert M. The comparative advantage theory of competition. J Mark 1995; 59 [April]: 1-15). An empirical test of this conceptual model is conducted with a Chilean sample of publicly traded firms, using structural equations modeling. The results show a significant impact of: market orientation, market sensing and innovativeness (among other knowledge-related resources) on superior performance, thus providing support for the original ideas of Drucker (1954) [Drucker Peter F. The practice of management. New York: Harper and Row Publishers, 1954.] and Schumpeter (1934), and for the dynamic evolutionary approaches to strategy (Dickson, 1992, Dickson Peter R. Toward a theory of competitive rationality. J Mark 1992; 56: 69-83., Dicskson, 1996, Dickson Peter R. The static and dynamic mechanics of competition: a comment on Hunt and Morgan's comparative advantage theory. J Mark 1996; 60: 102-106.; Hill and Deeds, 1996, Hill C.W., Deeds D.L. The importance of industry structure for the determination of firm profitability: a Neo-Austrian perspective. J Manag Stud 1996; 33: 429-451.).     

Strategy and the board of directors in venture capital-backed firms

The results of this research demonstrate that boards of directors in venture-capital backed companies are more involved in both strategy formation and evaluation than are boards where members do not have large ownership stakes. These same results are demonstrated even when industry, board size, level of diversification, and insider board representation are held constant. Agency theory and institutional theory are advanced as reasons for this higher level of involvement.Venture capitalists are generally seen as value-added investors who have played a significant role in the development of many entrepreneurial businesses (Bygrave and Timmons 1992). This success has lead students of industrial competitiveness like Thurow (1992) to argue that the venture capitalist should serve as an example for directors of all types of organizations. One of the most significant value-added activities of the venture capitalist is involvement with strategy [Fried and Hisrich 1995] , [MacMillan, Kulow, and Khoylian 1988] , Sapienza 1989, [Sapienza et al. 1996] and [Rosenstein, Bruno, Bygrave, and Taylor 1993] . Implicit in the writings extolling directors who act like venture capitalists Porter 1992a, Porter 1992b, [Bhide 1994] and [Thurow 1992] is the belief that they will be more active than traditional board members. However, little empirical work has been done to directly compare the level of strategic involvement of the two types of boards.Building on the work of Judge and Zeithaml (1992), this study compares the level of board involvement with strategy by the boards of venture capital-backed companies with the boards of other types of organizations. After establishing different levels of involvement, it then examines why there is a difference. Finally, this study provides additional empirical evidence on the relationship between board involvement and performance (Zahra and Pearce 1989).     

Marketing Capabilities and Firm Performance: A Hierarchical Model

The resource based theory of the firm (RBV) is briefly reviewed together with its recent application in the marketing literature. Significant contributions by Webster (1992) and Day (1994) are identified and an integration of the two presented as a hierarchical model of marketing capabilities. Three research propositions concerning the relationships between marketing capabilities and performance are developed and tested empirically in the transition economies of central and eastern Europe. In line with expectations from the theory of the RBV, higher order marketing capabilities are seen to be more important than operational capabilities in explaining superior competitive performance. The overall model is shown to be a helpful conceptualization of marketing capabilities and a number of issues for further research are identified.     

Approximating Large Diversified Portfolios

This paper considers a financial market with asset price dynamics modeled by a system of lognormal stochastic differential equations. A one‐dimensional stochastic differential equation for the approximate evolution of a large diversified portfolio formed by these assets is derived. This identifies the asymptotic dynamics of the portfolio as being a lognormal diffusion. Consequentially an efficient way for computing probabilities, derivative prices, and other quantities for the portfolio are obtained. Additionally, the asymptotic strong and weak orders of convergence with respect to the number of assets in the portfolio are determined.     

Pricing Options On Risky Assets In A Stochastic Interest Rate Economy1

This paper studies contingent claim valuation of risky assets in a stochastic interest rate economy. the model employed generalizes the approach utilized by Heath, Jarrow, and Morton (1992) by imbedding their stochastic interest rate economy into one containing an arbitrary number of additional risky assets. We derive closed form formulae for certain types of European options in this context, notably call and put options on risky assets, forward contracts, and futures contracts. We also value American contingent claims whose payoffs are permitted to be general functions of both the term structure and asset prices generalizing Bensoussan (1984) and Karatzas (1988) in this regard. Here, we provide an example where an American call's value is well defined, yet there does not exist an optimal trading strategy which attains this value. Furthermore, this example is not pathological as it is a generalization of Roll's (1977) formula for a call option on a stock that pays discrete dividends.     

卫星入轨段多源测轨数据融合定轨的加权方法

针对卫星发射入轨段遥外测多种不等精度、不同类型的测轨数据放在一起定轨时的合理加权问题,采用基于微分轨道改进基本原理,推导得到适用于不同类测轨数据联合定轨的动力学条件方程,提出了依据不同测量数据均方差确定该测量元素对应的动力学条件方程权重的方法。仿真验算和实战数据检验表明,该方法充分发挥了分布于各种测轨数据中的高精度测元的作用,融合后的定轨精度得到显著提高。