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101.
针对工业机器人是一个复杂的非线性■强耦合■多变量的动态系统,提出了CMAC与非线性PID复合控制器设计。该控制器由非线性PID反馈和CMAC前馈2部分构成,可消除初始输出力矩过大的弊端。采用非线性PID控制器替代经典PID控制器,因非线性积分环节可以随误差的变化进行调整,从而可以提高其自适应性和鲁棒性。CMAC学习速度快,网络收敛所需的训练次数少,可有效地用于机器人实时在线控制。仿真结果表明该设计方法具有有效性和可行性。 相似文献
102.
Constant I. Tra 《Applied economics》2013,45(1):55-63
This article investigates the implications of nonlinear income effects in Random Utility Models (RUM) for measuring general equilibrium welfare impacts. A popular approach in applied welfare analysis is to approximate the expected compensating variation (cv) for an amenity change as the cv of a representative consumer whose indirect utility is given by the expected maximum utility. However, this approach can be misleading in the case of nonmarginal changes as it implies that changes in income do not affect the consumer's choice. In this case the true expected cv can be obtained via simulation. Empirical applications to recreational demand find that the bias from the representative approach is small. This article re-evaluates the accuracy of the representative consumer approximation in the context of measuring the general equilibrium welfare impacts of large environmental changes. Our findings suggest that, though the representative consumer approximation could lead to biased point estimates of the expected cv, this bias is overwhelmed by the size of the confidence intervals that result from the empirical estimation of household preferences. 相似文献
103.
Liqiang Ni 《Journal of Marketing Channels》2013,20(4):339-359
Studies of international franchising are scant but increasing and can be divided into two streams of research: those focusing on environmental predictors of internationalization and those focusing on strategic, firm-level characteristics. Examining the latter category, this study empirically explores a set of firm-level attributes as predictors of decision making on whether firms seek international expansion. Using longitudinal data from Bond's Franchise Guide 2001–2008, we draw on a sample of U.S.-based fast-food franchise systems to test our hypotheses. Specifically, our database is composed of 1,058 observations of 158 chains, and we estimate a semi-parametric logistic model for international franchising. The model contributes to the literature by being the first to examine the nonlinearity of international franchising determinants using agency theory. The results show that (a) bonding, (b) the percentage of franchised units, (c) the number of states within which the system operates, and (d) the provision of area development agreements and sub-franchising significantly contribute to the international expansion of U.S.-based fast-food franchisors. 相似文献
104.
分析了非线性互补问题求解困难,利用粒子群算法并结合极大熵函数法给出了该类问题的一种新的有效算法。该算法首先利用极大熵函数将非线性互补问题转化为一个无约束最优化问题,然后应用粒子群算法来优化该问题,计算机程序实现表明该算法是有效的。 相似文献
105.
《International Journal of Research in Marketing》2021,38(3):639-662
It has been widely assumed that increases in customer satisfaction have continuous financial benefits for firms. However, recent meta-analysis results and anecdotal evidence suggest substantial variability in satisfaction-performance effects. We propose and investigate three explanations for this variability: (1) changing trade-offs of financial benefits vis-à-vis costs along the satisfaction continuum, (2) varying stickiness of benefits and costs over time, and (3) contextual effects related to a firm’s marketing strategic situation. For our empirical investigation, we used customer satisfaction scores and financial data for around 100 U.S. firms over a 15-year period. The results show that revenues and savings in marketing and acquisition costs can accelerate at high satisfaction levels. However, for many firms, operating costs and capital investments also accelerate, and shareholder returns for satisfaction improvements can become negative. Tests over different assessment horizons show that operating cost increases are sticky while top line benefits fade. Finally, firm strategy, offering customization, potential of customer word of mouth, and competitive innovation pressure determine the satisfaction payoffs. Our study will help managers to predict more accurately than before the financial effects of their customer-directed investment decisions. 相似文献
106.
Fedwire Funds is a real‐time gross settlement system that uses a decreasing block pricing scheme to attract nonurgent payments. A bank's optimal response to Fedwire's pricing depends on its perceived benefits to settling nonurgent payments quickly. If the urgency for immediate settlement is great enough, a bank responds to marginal price; otherwise, it responds to average price. We find banks respond to average price, suggesting that Fedwire's advantage over competing services of being able to provide immediate settlement is small. Moreover, attempts to increase demand for Fedwire services by lowering the cost of banks' final block of payments may be ineffective if there is not a corresponding decrease in average cost. 相似文献
107.
This article follows the nonlinear Autoregressive Distributed Lag (ARDL) error-correction methodology to explore nonlinearity in the relationship between the trade balances and the real exchange rates for China and its 21 partners. We find evidence for short-run asymmetric effects of exchange rate in cases of 18 partners, short-run adjustment asymmetry in cases of 11 partners, short-run cumulative asymmetry in cases of seven partners, and a significant long-run asymmetric effect cases of five partners. We find support for the “J-curve” that is only due to appreciation or depreciation of the Yuan in cases of five partners, including the U.S. 相似文献
108.
109.
We present a nonlinear solution method of saddlepoint dynamics in discrete time optimization problems. It is based on the backward attractivity of the stable manifold and is very easy to implement. After an introduction to the general method we present two applications. First, we consider the deterministic neoclassical growth model and demonstrate accuracy and stability of the method. Second, we solve a basic real business cycle model.revised version received July 2, 2003 相似文献
110.
采用"类比法",给出一类三阶非线性系统的李雅普诺夫函数的构造,较大推广了文献[1]的结果。 相似文献