基金持有人聪明吗——国外相关研究最新进展述评

基金经理的投资管理能力决定了基金的业绩。基金持有人是否聪明,即是否能够在众多的基金中选择风险控制能力强、盈利水平高的基金,决定了其投资基金的收益水平.近十余年来,随着行为金融学的兴起,对持有人基金选择能力的研究逐渐增多,出现了各种不同的研究方法,得到的结论也不尽相同,本文在梳理国外相关研究文献的基础上,阐述了国外最新的关于持有人基金选择能力研究的方法、主要结论以及最新进展,并探讨了不同研究所得结论存在差异的原因。     

物质流成本会计理论及其应用研究

由于现有物质流分析的缺陷与传统环境成本会计核算的不足,文章提出了物质流成本会计（MFCA）方法。该方法从物质流的“物理”与“价值”流转角度,根据输入输出模型,核算企业的合格产品成本与废弃物成本,找到企业资源损失的改善点,促使企业降低资源输入、提高资源使用率、减少废弃物输出。MFCA是企业进行低碳经济发展的一个有力工具。     

山东省入境旅游流的时空结构研究

山东省旅游责源丰富,近年来入境旅游业发展迅速,游客数量和外汇收入均居全国前列.本文通过对山东省入境旅游流的时间和空间结构分析发现,改革开放以来山东省的入境旅游流可分为三个增长阶段,整体呈上升趋势;游客以外国游客为主,港澳台游客年度波动较大;客源国比较集中,入境旅游业发展不稳定,受我国和客源国的经济、政治等因素影响明显.     

A network approach to modeling the multi-echelon spare-part inventory system with backorders and interval-valued demand

A multi-echelon inventory system implies the existence of a hierarchy of stocking locations, and the dependence and interaction between them. We consider a multi-echelon, spare-part inventory management problem with outsourcing and backordering. The problem is characterized by deterministic repair time/cost, and supply and demand that lie within prescribed intervals and that vary over time. The objective is to minimize the total inventory and transportation costs. We develop a network model for problem analysis and present a network flow algorithm for solving the problem. We prove that the Wagner-Whitin property, known for the lot-sizing problem, can be extended to the spare-part inventory management problem under study.     

污水管段设计流量的图论解析

针对污水管段设计流量计算中较易出现理解偏差与计算错误的问题,引入图论的方法,用节点与管段的关联关系对污水管道节点流量和管段流量进行定义并求解,明确了相关物理概念的界限,能使计算思路清晰,便于理解记忆。     

资源控制视角下人员任用与绩效的关系——华南地区IJV的实证研究

对东道国母公司来说,组织学习是建立国际合资公司(IJV)的重要原因之一。与外方母公司相比,东道国母公司在技术实力和管理经验方面都处于劣势,然而由于地缘的优势,东道国母公司能够为IJV的运作提供必须的物质和人力资源,并依靠这些资源与外方母公司展开谈判,对IJV实施必要的控制,从而促成学习目标的达成。从这个角度出发,本文研究了东道国母公司对IJV所采取的资源控制、人员任用控制以及IJV学习绩效之间的相互关系,并选取我国华南地区的96家合资企业作为实证研究对象,对资源控制、人员任用和IJV学习绩效的关系进行了实证研究。结果表明东道国母公司采取的资源控制并不直接影响IJV的学习绩效;但是通过东道国母公司对IJV的人员任用控制、资源控制会对IJV的学习绩效产生间接的影响。     

Litigation risk,accounting quality,and investment efficiency

This paper examines the moderating effect of litigation risk on the relationship between accounting quality and investment efficiency. We use directors’ and officers’ (D&O) liability insurance as a proxy for litigation risk, accruals quality for accounting quality, and investment cash flow sensitivity for investment efficiency (Biddle & Hilary, 2006; Hovakimian & Hovakimian, 2009). Using Canadian data from 1998 to 2008, we show that firms with higher D&O insurance coverage exhibit lower quality accruals. Moreover, the previously documented negative association between accruals quality and investment cash flow sensitivity is stronger (weaker) when abnormal D&O coverage is low (high), suggesting that the role of accounting quality in facilitating investment efficiency is conditional upon observable litigation risk.     

Heterogeneity effects from market interventions

The aim of this paper is to test whether the European Commission activities generate a heterogeneity effect on the merging parties. A sample of 74 firms involved in 45 contested merger and acquisition operations during the years 1990 to 1999 is used. The methodology is based on the GARCH framework. The main result is that, globally, the DGC interventions seem not to reduce significantly the heterogeneity among investors, except for the operations where it takes strong decisions like prohibition. In these last cases, the signal coming from the DGC encompasses valuable information and is well understood by market participants.     

适应中国高速铁路客流特性的售票组织策略优化研究

售票组织是铁路客运日常管理工作的重要内容之一，其策略的制定必须与客流特性相适应。分析中国高速铁路客流与既有线及国外高铁客流的不同点，在此基础上，提出以席位销售优化控制为核心的售票组织策略。实践证明了所提出策略的有效性。     

基于遗传算法的城际客运专线列车开行方案研究

分析城际客运专线列车开行方案的特点。以旅客时间消耗最小为目标，建立城际客运专线旅客列车开行方案的最小费用流模型。根据模型的特点，设计相应的遗传算法，并对遗传算法的适应值函数、算法步骤和算法复杂度进行分析。分析结果表明，该算法是一个收敛于全局最优解的近似有效算法。