公路建设项目对环境安全影响的物元分析模型

针对公路建设项目对环境安全影响问题,利用物元分析理论进行研究。在综合分析的基础上,构建了公路建设项目对环境安全影响的评价指标体系,并将多指标可拓综合评价方法应用于公路建设项目对环境安全影响的评价中。分析公路建设项目对环境安全的影响因素,建立公路建设项目对环境安全影响评价的物元模型。将多指标公路建设项目对环境安全影响的目标评价归结为单目标决策,比较简明确切地反映出公路建设项目对环境安全影响现状。通过某省大桥建设项目对环境影响进行实际考察研究,评价结果表明:该法科学合理、简单易行、有广阔的应用前景。     

民航企业安全投入的经济贡献率研究

通过对民航安全投入定义、特点及安全投入效益的分析,结合生产函数的有关概念及分析方法,建立了民航企业安全投入的经济贡献率分析模型。参考两家主要航空公司的有关安全投入的经济数据,采用该模型分析两公司的安全投入对企业利润和运输周转量的贡献率,以事实和数据证明安全投入是有产出的,对企业经济增长是有贡献的。从分析数据也可以看出,民航企业整体安全投入的经济贡献率远高于全国平均水平,其原因在于民航行业的高科技特点以及近年来在安全方面的持续投入。通过安全经济贡献率模型,可以对不同行业、不同企业的安全投入状况作出合理的比较和评价。     

Urban Land-banking Planning： A New Instrument to Regulate Urban Land Supply-demand of Nanjing City

It is the major purpose of the paper to present the urban land-banking planning and its functions of promoting the urban land-banking system and land use administration. The urban land-banking system has the potential attribute of acting as an irreplaceable role in urban land administration, but its unexpected function-deviation has impacted its implementation effect in China. A few city governments are attempting to deal with the problem by the urban land-banking planning which is expected to contribute to the extension of urban function, optimization of urban patterns, promotion of urban core competitiveness and overall construction of the urban value chain. In this paper, we primarily discuss the necessity, functions, purposes and main contents of the urban land-banking planning. Subsequently, the implementing situation of the urban land-banking system in Nanjing is analyzed, including its integrated mode, spatio-temporal quantitative distribution and main characteristics. Finally, the background and targets including total, compositions, space, and regulation points are gradually introduced to present the Nanjing land-banking planning version 2.     

The optimal harvest and management in the models of animal populations

We extended zero-cost optimization model for population of domestic animals. Also the model of hiring of labor in cattle-breeding farm is constructed and investigated.     

保险中的最优免赔额模型

研究了保险的最优免赔额问题,给出了最终财富效用的期望效用和最优免赔额.证明了若某人有递减的风险厌恶函数,则最优免赔额随着他的财富增加而增大的命题.     

长江岸线资源利用功能区划方法研究——以南通市域长江岸线为例

长江岸线是宝贵的自然资源。依据其资源条件，按照一定的区划原则，确定分段岸线使用的适宜性，合理安排港口、工业、城市生活以及生态保护等各项功能，实现岸线水域和陆域利用的合理布局，对长江岸线资源可持续利用具有重要意义。长江岸线资源利用功能区划必须坚持可持续开发作用、深水深用与浅水浅用、集约布局与纵深发展结合、上下游及左右岸利用方式协调、开发规模和时序与城市和产业发展适应等五条基本原则，区划过程一般包括4个步骤，即划分评价单元、评价岸线资源条件、分析岸线利用现状及需求、分析岸线利用适宜性并完成功能分区。提出了基于遥感与GIS的岸线资源条件和利用现状评价思路，引入了构造联表的岸线开发适宜性分析方法，并且应用这些方法对南通市域长江岸线资源进行了功能区划分。     

Function Approximation and Documentation of Sampling Data Using Artificial Neural Networks

Biodiversity studies in ecology often begin with the fitting and documentation of sampling data. This study is conducted to make function approximation on sampling data and to document the sampling information using artificial neural network algorithms, based on the invertebrate data sampled in the irrigated rice field.Three types of sampling data, i.e., the curve species richness vs. the sample size, the curve rarefaction, and the curve mean abundance of newly sampled species vs.the sample size, are fitted and documented using BP (Backpropagation) network and RBF (Radial Basis Function) network. As the comparisons, The Arrhenius model, and rarefaction model, and power function are tested for their ability to fit these data. The results show that the BP network and RBF network fit the data better than these models with smaller errors.BP network and RBF network can fit non-linear functions (sampling data) with specified accuracy and don't require mathematical assumptions. In addition to the interpolation, BP network is used to extrapolate the functions and the asymptote of the sampling data can be drawn. BP network cost a longer time to train the network and the results are always less stable compared to the RBF network. RBF network require more neurons to fit functions and generally it may not be used to extrapolate the functions. The mathematical function for sampling data can be exactly fitted using artificial neural network algorithms by adjusting the desired accuracy and maximum iterations. The total numbers of functional species of invertebrates in the tropical irrigated rice field are extrapolated as 140 to 149 using trained BP network, which are similar to the observed richness.     

Radial basis function networks with partially classified data

The problem of estimating a classification rule with partially classified observations, which often occurs in biological and ecological modelling, and which is of major interest in pattern recognition, is discussed. Radial basis function networks for classification problems are presented and compared with the discriminant analysis with partially classified data, in situations where some observations in the training set are unclassified. An application on a set of morphometric data obtained from the skulls of 288 specimens of Microtus subterraneus and Microtus multiplex is performed. This example illustrates how the use of both classified and unclassified observations in the estimate of the hidden layer parameters has the potential to greatly improve the network performances.     

环境功能区划与绿洲城市及城镇的环境管理

结合新疆绿洲城市及城镇的自然特点及发展实际，从加强城市环境功能区划工作的角，探讨了对绿洲城市及城镇的环境管理问题。