AN EMPIRICAL EXAMINATION OF RELATIONSHIP MAGNITUDE

Based upon a review of the extant literature, it is proposed that the structure of an interorganizational relationship is composed of relationship type and the under‐researched construct of relationship magnitude. Specifically, it is hypothesized that relationship magnitude, a second order construct composed of trust, commitment, and dependence, affects relationship type, which affects the perception of value of the relationship. The results of a survey analyzed through structural equation modeling support these hypotheses.     

THE EFFECT OF INVESTMENT IN INTERORGANIZATIONAL INFORMATION TECHNOLOGY IN A RETAIL SUPPLY CHAIN

The primary purpose of this research was to investigate the effect of investment in information technology in a supply chain. The results of that investigation are presented by focusing on an empirically tested supply chain relationship model containing both behavioral and operational constructs. The four behavioral constructs represented in the model are relationship trust, relationship commitment, relationship dependence, and long‐term relationship orientation. The four operational constructs represented in the model are retailer investment in interorganizational information technology, perceived supplier investment in interorganizational information technology, logistics efficiency, and logistics effectiveness. Among other findings, the results of the investigation found that perceived supplier investment in interorganizational information technology has a significant and positive effect on logistics efficiency.     

倒“U”型城市规模效率曲线及其政策含义——基于中国地级以上城市经济、社会和环境效率的比较研究

关于城市规模问题在中国城市化进程中受到广泛关注,各种关于城市规模的理论和政策争论的焦点在于,城市规模效率与城市规模之间的倒“U”假说是否成立。本文利用数据包络分析（DEA）中的BCC模型、超效率模型和Tobit回归模型,系统测算和分析了中国城市和地级市及以上城市2005—2010年的规模效率及其与城市规模之间的关系。总体来看,中国城市规模效率与其规模正相关,地级市及以上城市经济、社会和环境规模效率与其规模基本上呈“倒U”型关系,倒“U”曲线顶点对应的城市规模对城市发展具有较强的政策含义。据此,本文提出“促进中小城市发展、限制超大城市、完善城市管理、协调区域城市发展”的政策思路。     

铁路行包运量预测模型研究

铁路行包运量预测是以运输需求和内部供给为导向,综合考虑各种影响因素,对行包运量现状和发展的正确把握.探讨利用人工神经网络结合主成分分析的方法,建立铁路行包运量预测模型,解释并预测行包专列开行后铁路行包运量的增长趋势.实例分析的仿真结果表明,采用主成分分析法的广义回归神经网络模型结构简洁、预测精度高、收敛速度快,对相关铁路部门和企业的决策具有参考意义.     

金融市场风险测量方法综述

近十来年,风险测量方法在收益和风险剧烈波动的股票市场中的作用日益突出,无论是金融机构还是监管当局对金融市场风险的管理与测量也都给予了足够的重视,回顾与展望金融市场风险测量研究方法对于该方面的研究也具有一定的积极意义.     

Relationship Between Human and Nature In America Literature

Nature is one of an important themes in America literature.This article mainly analyzes Ralph Emerson,Henry David Thoreau, Nathaniel Hawthorne,Jack London,Ernest Hemingway and Robert Frost's different representative stylistic works on nature;inquires into nature's various forms in America literature,such as its personification,objectification,deification and so on;elaborates on its significant meanings;expounds and proves the relationship between and nature in different writer's works and points out nature's profound impact on human.