Pilot power optimization and coverage control in WCDMA mobile networks

In mobile networks using wideband code division multiple access (WCDMA), common pilot channel (CPICH) signals are used by mobile terminals for channel quality estimation, cell selection, and handover. The strength of the CPICH signal determines the coverage area of the cell, impacts the network capacity, and thereby the quality of service, and is therefore a crucial parameter in network planning and optimization. Pilot power is the most important parameter that allows us to control the strength of the CPICH signal. The more power is spent for pilot signals, the better coverage is obtained. On the other hand, a higher value of the pilot power level in a cell means higher pilot pollution in the network and less power available to serve user traffic in the cell. In this paper, we consider the problem of minimizing the total amount of pilot power subject to a coverage constraint. Our modeling and solution approaches are based on mathematical programming techniques. We present a basic model for pilot power optimization subject to a full coverage constraint as well as its extended version which allows us to study various coverage levels and to consider user traffic distribution over the network. We also propose an efficient algorithm that gives near-optimal solutions to the problem within a reasonable amount of time. We report our numerical experiments for three WCDMA networks of various sizes based on realistic planning scenarios and examine the effect of different levels of the required coverage degree on the total amount of pilot power.     

网络化组织形式中的信任构建——新制度主义视角

本文针对网络化组织的特征,分析了组织间合作的障碍以及由此产生的管理问题,探讨了关系型治理机制中信任对降低合作的复杂性以及规范合作者行为的促进作用,并在此基础上,考虑网络化组织间合作不同阶段的特点,提出了基于合作周期的三阶段信任建设模型.     

The Role of Financial Institutions in the Corporate Governance of Listed Chinese Companies*

This paper explores the role of Chinese financial institutions in the corporate governance of listed companies through interviews with both senior managers of financial institutions and board directors of listed companies. Our results show that, while most securities companies are passive investors, a good proportion of the active mutual funds help their portfolio companies prepare financial forecasts, standardize their operations, raise external funds, strengthen their company image in the capital markets, and sometimes intervene in corporate issues. This limited role can be attributed to a number of factors specific to the Chinese context including highly concentrated state ownership, an immature regulatory environment, inadequate transparency and disclosure of financial information, and weak corporate governance within financial institutions themselves. It could also be affected by several other factors that are considered to cause institutional passivity in developed countries such as conflicts of interest, monitoring costs and lack of expertise.     

采用监督信号的供应链内部知识转移激励机制

目前,一些与激励机制有关的研究开始在供应链内部知识转移中展开,但通常仅考虑对知识供给方的激励而忽略了对知识供给方的监督,致使激励效果受到限制。为解决此问题,采用数学建模与计算机仿真分析方法,通过引入监督信号,在供应链内部成员间知识转移基本激励模型的基础上,分别建立供应链上下级和同级成员间知识转移激励模型。研究发现,采用监督信号后,无论是上下级还是同级成员之间,供应链内部知识转移的收益水平和转移效率均得到了提升,但相比同级成员,供应链上下级成员间知识转移的收益水平和转移效率更高,收益更大。研究成果能为供应链企业有效开展知识转移活动和提升供应链竞争能力提供实践指导。     

Bertrand寡占市场企业交叉持股时定价策略和最优持股的研究

本文首先研究了公司间交叉持股的利益分配问题,导出了n个公司间交叉持股的利润分配公式。以此为基础,导出了Bertrand寡占市场公司间交叉持股时价格反应函数和均衡价格的一般表达式。通过构建一个两阶段动态博弈,着重研究了Bertrand双寡头市场两厂商交叉持股时的均衡策略问题,给出了厂商间均衡定价与最优持股,分析了均衡策略对厂商经济行为及市场绩效的影响。研究结果表明,可替代品市场的两厂商间交叉持股具有反竞争、促合作的效应。较之非交叉持股,均衡交叉持股提高了均衡价格水平,降低了两厂商各自的产量水平,使各自在较低产量水平下获得较高的利润,从而实现了两厂商间双赢的局面。然而,交叉持股将导致消费者剩余减少,社会经济福利降低。     

学习型联盟中R&D方式与最优投资水平分析——吸收能力的观点

研发方式和R&D投资水平是学习型联盟决策的主要内容,而传统的组织学习理论忽视了联盟成员的吸收能力在学习型联盟决策中的重要作用。本文首先根据学习型联盟成员吸收能力的特点和影响因素,给出了吸收能力的一般表示方法。并通过三阶段的博弈模型分析了吸收能力对联盟成员的研发投入、研发方式决策等方面的影响。     

战略联盟、价值网络中关系形成的效用组合分析

过于关注价值占有阻碍了人们对联盟及价值网络中关系的本质,即价值创造的理解。我们认为,价值创造关系是建立在联盟及价值网络中各经济主体的效用体系上的,这是一种彼此的效用相互得到满足的状态。当每个经济主体的效用空间不只是包含价值占有时,那么,为建立这样的效用体系,经济主体就可能在价值占有问题上做出让步。本文通过所建立的模型支持了这样的论点,而且,在一定的条件下,由价值占有引起的冲突也可在这样的效用体系下自动得到解决。     

基于价值创造的企业内部行为主体的特点及互动机制

针对企业持续创新活动的来源问题,基于价值网络理论从企业官方活动和非官方活动两个方面,分析了企业内部官方活动行为主体和非官方活动行为主体价值创造的特点,构建了这两类行为主体在价值创造和价值交换中的互动关系模型,并运用相关数据对模型各构成要素进行了初步的相关性检验,结果显示,该模型至少在一定的业务活动范围内是基本有效的。     

A note on the complexity of the problem of two-agent scheduling on a single machine

We consider a two-agent scheduling problem on a single machine, where the objective is to minimize the total completion time of the first agent with the restriction that the number of tardy jobs of the second agent cannot exceed a given number. It is reported in the literature that the complexity of this problem is still open. We show in this paper that this problem is NP-hard under high multiplicity encoding and can be solved in pseudo-polynomial time under binary encoding. When the first agent's objective is to minimize the total weighted completion time, we show that the problem is strongly NP-hard even when the number of tardy jobs of the second agent is restricted to be zero.     

企业的承诺经营及其模型研究

企业间的竞争无处不在,如何选择适合自身发展的承诺经营战略直接关系着企业的存亡.本文拟以博弈论的方法,构建企业竞争中的承诺经营博弈模型,对有行动先后的Cournot寡头竞争博弈、承诺营销博弈和双重垄断博弈及其均衡分析,为企业提供相应的承诺经营理论与实践策略.