共查询到19条相似文献,搜索用时 78 毫秒
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提高企业效益的一个很重要方面是提高企业的投资效益.针对这一问题,运用动态规划的方法,提出了一个决策模型,使该模型得出的投资方案产生最大的贴现现金流(DCF). 相似文献
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本文对当p>0时,采用了与传统的方法不同的证明方法,判定3p-级数的敛散性,并对其收敛或者发散的速度予以了讨论。 相似文献
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本利用弹道参数与测量元素之间的精确关系,对两种连续波雷达推导一种跟踪点不一致的精确修正方法,并且对照传统的近似修正方法做了比较分析。精确修正方法没有截断误差,精度较高,不受跟踪点与目标点距离的影响,也不受目标与测站距离的影响,优于传统的近似修正方法。 相似文献
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风险企业的委托-代理模型 总被引:4,自引:0,他引:4
传统的委托—代理理论在解释风险企业家的行为时遇到了困难。通过对传统的委托—代理理论进行重新构造和拓展,本提出逆反努力法则,验证了隐藏行动的道德风险的存在,并通过Newton迭代法和图形学方法对风险企业家的长期努力水平进行计算,发现努力水平对努力效应指数n表现出协同效应。 相似文献
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模糊数学在城市交通控制中的应用 总被引:4,自引:0,他引:4
本文将模糊数学方法应用到城市交通系统,对城市交通控制系统实施模糊控制,并改进了Pappis等人的控制方法,仿真结果表明模糊数学能成功地应用到交通控制系统.并比传统的控制方法有效。 相似文献
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Hao-Ming Liang Ce-Kuen Shieh Tzu-Chi Huang Wen-Shyang Hwang Chih-Heng Ke 《Mathematical and Computer Modelling》2011,53(3-4):443-457
According to previous work, the performance of the Distributed Coordination Function (DCF) (i.e., the basic access method of the IEEE 802.11 protocol) is far from optimum due to use of the binary exponential backoff (BEB) scheme as its collision avoidance mechanism. There has been considerable discussion of DCF issues and its performance analysis. However, most schemes assume an ideal channel, which is contrary to realistic wireless environments. In this paper, we present a simple yet pragmatic distributed algorithm, designated the density based access method (DBM), which allows stations to dynamically optimize the network throughput based on run-time measurements of the channel status. Our simulation results demonstrate that the DBM is highly accurate. The performance in terms of throughput and fairness is nearly optimal by use of the proposed scheme. 相似文献
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A. Kent 《The Journal of the Operational Research Society》1970,21(1):113-117
In this paper, the effect of discounted cash flow (DCF) on replacement policy is expressed in terms of the undiscounted quantities normally used in standard replacement analysis. This is useful to an operator who already uses the standard analysis and wishes to know quickly what effect DCF will have on his policy. Simple formulae are provided to determine the optimum delay in replacement required by DCF, and the consequent saving in real costs. A numerical example illustrates the application of the formulae to vehicle replacement. 相似文献
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In the IEEE 802.11 MAC layer protocol, the basic access method is the Distributed Coordination Function based on the CSMA/CA.
In this paper, we investigate the analytic performance of IEEE 802.11 DCF in the non-saturation mode. We assume that there
is a fixed number n of competing stations and the packet arrival process to each station is a Poisson process. We model IEEE 802.11 DCF in non-saturation
mode by a 3-dimensional Markov chain and derive the steady state probability of the Markov chain by applying the matrix analytic
method. We obtain the probability generating function of Head-of-Line delay (HoL-delay), non-saturation throughput and packet
loss probability. Our results can be used for finding the optimal number of stations that can be accommodated while satisfying
a given QoS requirement.
This research is supported by the MIC (Ministry of Information and Communication), Korea, under the ITRC (Information Technology
Research Center) support program supervised by the IITA (Institute of Information Technology Assessment). 相似文献
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A generalization of the Discounted Cash Flow method of measuring return on investment is shown to provide a well-defined and useful measure for all cash flow series which can be regarded as relating to an investment project. Problems of multiple solutions and of inadmissible implicit assumptions that can arise with the standard DCF method are thus overcome, while the essential features of the method are retained. In a large proportion of cases met in practice the generalized procedure reduces to the standard one. The possibility of a time-dependent cost of capital is included in the analysis. 相似文献
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Kee H. Chung 《The Journal of the Operational Research Society》1989,40(5):495-498
This paper presents the discounted cash-flows (DCF) approach for the analysis of the optimal inventory policy in the presence of the trade credit. The DCF approach permits a proper recognition of the financial implication of the opportunity cost and out-of-pocket costs in inventory analysis. This approach also permits an explicit recognition of the exact timing of cash flows associated with an inventory system. As a result, the effect of the delayed payment is appropriately reflected in determining the optimal order size. 相似文献
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V. Deljoo S.M.J. Mirzapour Al-e-hashem F. Deljoo M.B. Aryanezhad 《Applied Mathematical Modelling》2010
In this paper, solving a cell formation (CF) problem in dynamic condition is going to be discussed using genetic algorithm (GA). Previous models presented in the literature contain some essential errors which will decline their advantageous aspects. In this paper these errors are discussed and a new improved formulation for dynamic cell formation (DCF) problem is presented. Due to the fact that CF is a NP-hard problem, solving the model using classical optimization methods needs a long computational time. Therefore the improved DCF model is solved using a proposed GA and the results are compared with the optimal solution and the efficiency of the proposed algorithm is discussed and verified. 相似文献
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This paper discusses the optimum order quantity of the EOQ model that is not only dependent on the inventory policy but also on firm’ credit policy. Here, the conditions of using a discounted cash-flows (DCF) approach and trade credit depending on the quantity ordered are discussed. We consider that if the order quantity is less than at which the delay in payments is permitted, the payment for the item must be made immediately. Otherwise, the fixed trade credit period is permitted. 相似文献
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In 1994, professors Jaggi and Aggarwal presented the economic ordering policies of deteriorating items in the presence of trade credit using a discounted cash-flows (DCF) approach. This paper discusses the same problem as that of Jaggi and Aggarwal and indicates that some approximations to the optimal cycle times proposed by Jaggi and Aggarwal are inappropriate sometimes. A theorem is derived out to find the optimal cycle time. With that theorem, a simple algorithm is developed to locate the optimal cycle time. 相似文献
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This paper presents an extended inventory model of Huang (J. Oper. Res. Soc. 54, 1011–1015, 2003), which investigated the retailer’s optimal inventory policy under two levels of trade credit. Herein, we consider the impact
of a replenishment policy on the timing of the cash flows associated with payments to suppliers and revenue streams from customers.
That is, the same cash amount will possess different money value at different future time. To see this, we adopt the more
appropriate net present value (NPV) object instead of the average cost objective. In addition, the deteriorating effects will
be incorporated in this inventory model, and the time to deterioration of each item follows an exponential distribution. The
discounted cash flow (DCF) approach is used to derive the optimal solution in this study. Furthermore, we first show that
the optimal solution not only exists bus also is unique. Then, we provide a theorem to locate the optimal ordering policy.
Finally, a numerical example for illustration is provided. 相似文献