基于规模不经济和网络外部性的捆绑手机供应链定价决策

考虑网络外部性和规模不经济的影响,对捆绑手机供应链的决策展开研究.构建了捆绑手机供应链的分散决策模型和集中决策模型,并对模型进行了比较分析.研究表明:1)规模不经济系数会阻碍系统利润的增长,而网络外部性系数促进系统利润的增长.2)手机制造商或电信运营商主导系统时所获利润远高于其不主导系统时的情形.同时手机制造商主导系统时,系统的利润要高于电信运营商主导系统时的利润.3)在分散决策下,手机制造商和电信运营商的利润均未达到最优:集中决策下,合约机套餐价格较低,总的销量更高,系统的利润更高.通过“补贴联合收益共享”协调契约,可以实现手机制造商和电信运营商的收益最大化.     

电信运营商双寡头定价机制设计

电信市场存在运营商之间的竞争关系,运营商针对异质性消费者的定价机制设计更是直接影响其利润的实现,本文利用机制设计方法,分析了电信运营商的双寡头垄断定价策略,研究发现:(1)运营商的核心利润来源于低类型消费者的总剩余。低类型消费者的消费扭曲来源于运营商提供给高类型消费者过高的信息成本。要想改善低类型消费者的不满和消费扭曲,需要降低对高类型消费者的优惠幅度。(2)电信运营商的最优定价随竞争对手的价格同向变动。(3)电信运营商最优定价与消费者对该运营商的服务体验成正比,与消费者对竞争对手运营商的服务体验成反比。所以,运营商应当不断优化自己网络的服务质量,提高消费者的服务体验,进而才能有涨价的空间。     

s-乘数收敛及其对可允许极拓扑的不变性

在局部凸空间中给出了s-乘数收敛性成为全程不变性的充分条件和必要条件,s-乘数收敛性成为对偶不变性的充分条件.并证明了c-乘数收敛不是对偶不变性.     

基于移动增值业务的电信服务链建模研究

以高速发展的移动互联网为背景,研究了由一个服务提供商和一个电信运营商组成的移动增值业务电信服务链商业模式.考虑了电信运营商促销对于移动增值业务市场需求的影响,构建了电信运营商主导的移动增值业务博弈模型,给出了不同合作模式情形下服务提供商和电信运营商的最优决策.     

我国货币乘数增长的数理分析和货币乘数预测

对货币乘数运动规律的认识以及货币乘数的预测直接关系到国家货币政策的制定.从货币乘数决定因素入手,结合实证观察和数理分析,从数学上严格证明了货币乘数趋势性增长的原因是总准备金率和通货比率的长期下降趋势,说明货币乘数的增长是金融工具创新和金融制度创新共同作用的结果.发现货币乘数的短期波动直接受基础货币的影响,依此建立的货币乘数预测方程,不仅提高了对货币乘数长期趋势性预测的准确性,而且较为准确地预测了货币乘数的季节波动性.因此,中央银行在制定金融规划的时候,应把基础货币变动对货币乘数的影响考虑在内,以更好地实现操作目标向中介目标的传导.     

电信技术选择管制的突变模型

"追捧效应"、"市场锁定"一直是电信产业技术选择的奇特现象,突发性的变化后是持续性的稳定,电信技术市场突发性的变革令传统经济分析难以找到解释的途径.系统理论的最新研究成果同时表明,以均衡分析研究经济是不足以反映客观现实的.电信技术的迅猛发展,动态化特征加剧,更使均衡分析没有用武之地.以系统论的观点分析电信产业技术的市场化突变是本文的主要内容.通过建构电信技术选择管制的突变模型,得出电信技术选择突变产生的系统条件.     

用于电流传感器的高线性双折射高扭转光纤

本文用耦合模理论分析了扭转的线性双折射光纤。高线性双折射光纤在熔融态下扭转后形成高椭圆双折射光纤。具有合适扭转率的这种光纤是检测Faraday效应的功能型光纤,可在很大程度上消除线性双折射对检测的影响。用上述光纤对电流进行的测量证明了这一观点。     

基于马尔科夫链的我国三大运营商市场占有率预测分析

合理预测产品市场占有率是企业进行营销决策时所要考虑的重要因素之一.以我国三大运营商移动用户数为基础,借助马尔科夫理论中的市场占有率的预测模型,探讨了在保持市场变化趋势稳定的情况下,未来市场占有率的变化情况.研究结果表明,未来我国移动、联通、电信三大运营商移动用户数的市场占有份额将稳定在65.7%20.0%14.3%左右.     

基于电信领域客户细分模型的个性化服务构建

随着互联网技术和智能终端的迅速发展,电信运营商之间的竞争愈演愈烈,提高服务水平是运营商提高竞争力的重要举措.通过对逻辑回归模型的前提条件和存在弊端进行分析,构建在电信领域中的基于改进的多元逻辑回归客户细分模型,在用户细分的基础上融入个性化服务的思想,并进行实证研究,结果显示,模型预测效果良好.     

多任务委托-代理关系中电信服务提供商的激励机制研究

由于电信运营商和电信服务提供商(SP)之间存在利益冲突和信息不对称,很容易导致SP的违规行为。电信运营商和SP之间的关系属于多任务的委托-代理关系。在设计委托-代理激励合同时,从三个任务的角度考虑了电信运营商对SP的激励,并通过该模型分析了服务质量和信誉等级对SP的重要性。     

A MIP-based approach to solve the prize-collecting local access network design problem

This paper presents a new combinatorial optimization problem that can be used to model the deployment of broadband telecommunications systems in which optical fiber cables are installed between a central office and a number of end-customers. In this capacitated network design problem the installation of optical fiber cables with sufficient capacity is required to carry the traffic from the central office to the end-customers at minimum cost. In the situation motivating this research the network does not necessarily need to connect all customers (or at least not with the best available technology). Instead, some nodes are potential customers. The aim is to select the customers to be connected to the central server and to choose the cable capacities to establish these connections. The telecom company takes the strategic decision of fixing a percentage of customers that should be served, and aims for minimizing the total cost of the network providing this minimum service. For that reason the underlying problem is called the Prize-Collecting Local Access Network Design problem (PC-LAN).     

Tabu Search for a Network Loading Problem with Multiple Facilities

This paper examines a network design problem that arises in the telecommunications industry. In this problem, communication between a gateway vertex and a number of demand vertices is achieved through a network of fiber optic cables. Since each cable has an associated capacity (bandwidth), enough capacity must be installed on the links of the network to satisfy the demand, using possibly different types of cables. Starting with a network with no capacity or some capacity already installed, a tabu search heuristic is designed to find a solution that minimizes the cost of installing any additional capacity on the network. This tabu search applies a k-shortest path algorithm to find alternative paths from the gateway to the demand vertices. Numerical results are presented on different types of networks with up to 200 vertices and 100 demand vertices.     

基于因素分析与BP神经网络的电信企业管理胜任力测评研究

运用行为事件访谈法、专家小组讨论法,以及探索性因素分析与验证性因素分析方法,构建电信企业管理胜任力的结构模型及其评价指标体系.在确保测评指标合理性与有效性的前提下,提出一种基于BP神经网络的管理胜任力测评模型,通过仿真和实例表明了测评模型的有效性,为综合评价电信企业员工的管理胜任力提供了一种新方法。     

一个新的解线性规划的神经网络

本文提出一个新的解线性规划的Hopfields-型网络。该网络基于线性规划的对偶理论,并使用了Sigmoid函数,但不需要预先给定的罚参数和乘法模拟器,我们证明该网络不仅全局收敛到线性规划的精确解,而且能同时解原规划和对偶规划。由于在该网络中没有使用乘法模拟器而利用了Sigmoid函数,因此该模型是很容易用硬件实现的。     

Heuristic algorithms for the multi-depot ring-star problem

In this paper, we consider the problem of designing urban optical networks. In particular, given a set of telephone exchanges, we must design a collection of ring-stars, where each ring-star is a cycle composed of a telephone exchange, some customers, some transition points used to save routing costs and customers not on the cycle connected to the cycle by a single edge. The ring topology is chosen in many fiber optic communication networks since it allows to prevent the loss of connection due to a single edge or even a single node failure. The objective is to minimize the total cost of the optical network which is mainly due to the excavation costs. We call this problem Multi-Depot Ring-Star Problem (MDRSP) and we formulate it as an optimization problem in Graph Theory. We present lower bounds and heuristic algorithms for the MDRSP. Computational results on randomly generated instances and real-life datasets are also presented.     

双边市场异业合作网络平台的定价策略

本文以网络平台异业合作为背景,在Hotelling模型框架下,基于双边用户都是部分多归属的假定,结合平台采取异业合作可以提高用户固有收益这一前提,分析了产品和服务的差异化程度、拥挤效应及组间网络外部性强度对网络平台定价策略的影响。结果显示,双边用户的组间网络外部性强度不同时,随着拥挤效应的增强或产品和服务的差异化程度的提高,无论是在位平台还是采取异业合作的新进入平台,都会对一边用户提高,而对另一边用户降低收取的交易费;组间网络外部性强度相同时,平台对双边用户收取的交易费相同,且只与用户固有收益及交易量有关。研究表明,新进入市场的网络平台不应采取传统双边市场中常用的价格战策略来争夺市场份额,而应积极采取异业合作,通过提供优质优价的产品和服务来同在位平台竞争。     

Network DEA pitfalls: Divisional efficiency and frontier projection under general network structures

Data envelopment analysis (DEA) is a method for measuring the efficiency of peer decision making units (DMUs). Recently network DEA models been developed to examine the efficiency of DMUs with internal structures. The internal network structures range from a simple two-stage process to a complex system where multiple divisions are linked together with intermediate measures. In general, there are two types of network DEA models. One is developed under the standard multiplier DEA models based upon the DEA ratio efficiency, and the other under the envelopment DEA models based upon production possibility sets. While the multiplier and envelopment DEA models are dual models and equivalent under the standard DEA, such is not necessarily true for the two types of network DEA models. Pitfalls in network DEA are discussed with respect to the determination of divisional efficiency, frontier type, and projections. We point out that the envelopment-based network DEA model should be used for determining the frontier projection for inefficient DMUs while the multiplier-based network DEA model should be used for determining the divisional efficiency. Finally, we demonstrate that under general network structures, the multiplier and envelopment network DEA models are two different approaches. The divisional efficiency obtained from the multiplier network DEA model can be infeasible in the envelopment network DEA model. This indicates that these two types of network DEA models use different concepts of efficiency. We further demonstrate that the envelopment model’s divisional efficiency may actually be the overall efficiency.     

Radar placement based on a geometric uncertainty multiplier reduction criterion

In this paper the problem of retrieving wind field information from Doppler radar data motivates the formulation of a method to design radar network configurations. The problem of estimating wind velocities from radar data is posed and used to construct a certain retrieval operator. This operator contains a factor that may be interpreted as an uncertainty multiplier. It depends on the geometry of the configuration of the radar network. The uncertainty multiplier is shown to vary continuously with perturbations of the network configuration. It is also shown to be a generalization of the Doppler angle condition used in meteorology. Numerical examples are presented to determine a network of five radars minimizing the uncertainty multiplier for the problem. Also, a configuration of sites is determined that maximizes the area of the Doppler region.     

光纤陀螺随机误差的滤波方案的探讨

范跃祖，宁文如，刘剑．光纤陀螺随机误差的滤波方案的探讨．数理统计与管理，１９９７，１６（４），２９～３２．光纤陀螺是新一代的光学陀螺仪，它的性能决定着惯性参照系统的精度。光纤陀螺的误差分为两大类。一类是有规律的，另一类是随机的。本文提出了两种新的用于光纤陀螺随机误差补偿的Ｋａｌｍａｎ滤波方案，考虑了两种随机模型：（Ⅰ）角速度变化为等随机的；（Ⅱ）角速度变化为等随机加速的。仿真结果表明，第二种方案对噪声起到了很好的抑制作用和滤波效果