城镇土地利用潜力评价方法研究

研究目的：研究合理的城镇土地利用潜力评价方法。研究方法：分析城镇土地利用状况及潜力指标的内涵、关系,设计土地利用状况描述的4元组模型、单项潜力评价的指标增量模型,综合潜力评价的分析模型及城镇土地利用潜力评价的技术流程,并对基于加权距离的指标空间聚类、基于用地依赖的功能分区聚类、应用叠置法划分潜力评价单元、土地潜力分级与挖潜改造决策等关键环节进行阐述。研究结果：研究方法能保证评价过程透明和评价结果科学,在实践应用中得到验证。     

A contribution to the assessment of scenic quality of landscapes based on preferences expressed by the public

The purpose of this paper is to validate a model for predicting the public's preference for a landscape using simple statistical techniques. The model assigns numerical values to 42 landscape variables grouped into physical, aesthetic and psychological attributes. The landscape value is obtained using an additive value function. The results of the model on certain landscapes are compared with the preference expressed by the public in a survey of 183 people.The homogeneity of the survey responses was checked in each photograph. It was determined that means and standard deviations of the scores represent the true preference.A strong positive association was observed between preference and certain landscape attributes such as expression, soil use or colour. A marked negative association was detected with respect to landscape alterations.A linear regression was carried out to analyse the predictive capacity of the model. The independent variable was the global score assigned by the model to each photograph and the dependant variable was the mean of the scores assigned by the survey respondents. The high level of correlation obtained indicates that the model is a good predictor of the public's preferences in relation to the set of photographs shown in the survey.To complete the analysis of the model as a preference predictor, a multiple linear regression was carried out between the mean score obtained in the survey and the model elements. Attributes and variables that have the greatest influence on pubic preference were detected.     

At‐home meat consumption in China: an empirical study*

The remarkable economic changes occurring within China since 1978 have resulted in a striking alteration in food consumption patterns, and one marked change is the increasing consumption of meat. Given China’s large population, a small percentage change in per capita meat consumption could lead to a dramatic impact on the production and trade of agricultural products. Such changes have major implications for policy makers and food marketers. This paper concentrates on meat consumption patterns in the home in China. A censored linear approximate almost ideal demand system model was employed in the study, and major economic parameters were estimated for different meat items. Data used in this study were collected from two separate consumer surveys – one urban and one rural in 2005.     

上市公司业绩预告与股票收益率的经验研究

运用上市公司财务与市场数据,对业绩剧变公司的业绩预告的特点、影响因素及业绩预告对股票价格影响的实证研究发现,业绩预告披露的可能性与业绩变动、基金持股比例、公司规模等因素有关,与风险、前十大股东持股比例等因素无关;业绩预告披露、年度财务报告披露期间的异常收益率与ROE变动比率、资产规模、信息披露细致程度等因素有关。在年报披露期间,业绩预告披露与否对异常收益率有显著影响,业绩预告会在一定程度上削弱年度财务报告信息对该公司股票的利空、利好效应.     

PI背景下的TDI结构方程模型

态度理论为地区形象(PI)和旅游目的地形象(TDI)的联合研究提供了一个平台。本文构建了一个理论上的地区形象背景下的旅游目的地形象结构方程模型。模型是一个具有因果关系的结构方程模型,包括8个潜变量和28个观测变量。以徐州为例,在运用SPSS15.0软件对数据进行信度检验的基础上,利用LISREL8.70软件对模型进行了验证性因子分析和路径分析。研究发现:(1)结构模型中各潜变量之间的路径与假定基本符合,模型的整体拟合性能良好;(2)旅游资源认知和旅游服务认知会对旅游意愿产生作用,这符合我们的传统理念;(3)地区特征和居民素质对旅游服务感知、目的地评价和旅游意愿三者均有效应,而地区竞争力和居民竞争力仅对旅游服务感知产生影响。     

中国黄金市场期货与现货价格关系实证研究

根据向量自回归模型的脉冲响应函数和方差分解方法,借助协整关系和格兰杰因果关系,构建双变量EC-EGARCH模型,对我国黄金期货市场与现货市场的价格关系实证.结果显示,黄金期货与现货之间不存在相互影响关系;协整残差是好的解释变量;杠杆效应和溢出效应不明显;期货市场价格发现功能有待进一步完善.     

VaR模型在人民币汇率风险度量中的应用

本文首先从VaR模型的假设前提入手,通过对人民币汇率收益率序列的随机性、正态性和异方差性的综合检验,验证了VaR模型在人民币汇率风险度量中的适用性.随后,分别采用非参数法和参数法两大类共九种VaR方法对人民币汇率风险进行实证度量.最后,通过准确性检验发现,GARCH-t模型是度量当前人民币汇率风险的最优方法.     

经济差距、研发投入对城市经济增长影响研究——基于江苏省13市的数据分析

本文旨在考察研发投入区际流动能否通过空间知识溢出效应促进区域城市经济增长,以及当经济差距缩小时研发投入对经济增长空间溢出效应变化特征。以江苏省13个地级市为研究对象,运用多种空间计量分析方法,对上述假设进行实证检验。研究结果表明:研发投入区际流动的空间溢出效应对区域城市经济增长呈显著的正向效应;苏南、苏中、苏北研发投入空间溢出效应对区域经济增长影响程度高于总体平均水平。本文结论为促进区域间研发投入合理流动、统筹区域经济协同发展、促进省域经济高质量发展提供政策启示。     

第三方物流企业成本竞争力综合评价研究

客户在选择第三方物流服务的时候,成本控制是第一位的考量。提出了第三方物流企业成本竞争力的概念,构建出了基于成本管理与控制的第三方物流企业成本竞争力评价指标体系,引入模糊综合评价模型,全面地对我国第三方物流企业的成本竞争进行量化评判和分析。     

基于RBAC模型的网络信息系统权限管理的设计和实现

本文提出了基于RBAC模型的权限管理的设计和实现方案,讨论了权限管理为核心的面向对象设计模型,以及权限访问和权限控制等技术。