数控加工中心加工路线的选择

在数控加工过程中，加工路线选择正确与否决定了加工工件质量和生产效率的高低，为此探讨了加工路线的确定原则，提出了铣削、钻削等加工方法的加工路线的选择要点和注意事项，这对实际加工应用具有一定的参考作用。     

推动区域创新网络构建的路径选择

区域创新网络是区域创新主体结成的一种新型产业组织形式，是区域创新激励的重要制度安排。文章针对我国区域创新网络发展过程中存在的问题，提出各地区域创新网络的培育工作须从区域创新网络的选址、地区的优劣势因子分析、创新主体功能、创新环境、路径创造、形成机制的培育等方面予以加强。     

An outer approximation algorithm for the robust shortest path problem

This paper describes a new algorithm for the stochastic shortest path problem where path costs are a weighted sum of expected cost and cost standard deviation. We allow correlation between link costs, subject to a regularity condition excluding unbounded solutions. The chief complication in this variant is that path costs are not an additive sum of link costs. In this paper, we reformulate this problem as a conic quadratic program, and develop an outer-approximation algorithm based on this formulation. Numerical experiments show that the outer-approximation algorithm significantly outperforms standard integer programming algorithms implemented in solvers.     

全球城市区域：我国国际大都市的生长空间

经济全球化带来一种新的地域现象,即全球城市区域。作为发展中的国家,我国现代国际大都市建设也许并不能像发达国家早期的国际大都市那样“单独”地形成与发展,而是内生于全球城市区域的发展中。因此,加强全球城市区域中的合作与协调,将对我国现代国际大都市建设形成积极的影响,并提高整个全球城市区域的竞争能力和促进其经济效益。     

Urban and Regional High Technologies: The Case of Oulu

This paper investigates the reasons behind what has been termed the 'Oulu Phenomenon' in Northern Finland. Over the past two to three decades the city of Oulu has transformed its economy from dependency on timber, paper and pulp industries into one based on High Technology, notably, telecommunications, biotechnology, electronics, multimedia and environmental technologies. In particular the paper will explore the role played by the national government via regional policy, higher education and the subsequent interaction between these, the local authorities and entrepreneurs     

Block Structural Path Analysis: Applications to Structural Changes in the Indonesian Economy

The compilation of several social accounting matrices for Indonesia has enabled the analysis of some important aspects of the structure of the Indonesian economy. In the present paper, the analysis that has been conducted with structural path methods will be enhanced through the identification of a block structure for the technique. This block structural path analysis is offered as a complement to—not a replacement for—the traditional applications of this method. A new form of triple decomposition of the social accounting matrix inverse is offered to assist in identifying important changes in the structure of the Indonesian economy for 1975, 1980 and 1985.     

Robustness of normal theory statistics in structural equation models*

A condition is given by which optimal normal theory methods, such as the maximum likelihood methods, are robust against violation of the normality assumption in a general linear structural equation model. Specifically, the estimators and the goodness of fit test are robust. The estimator is efficient within some defined class, and its standard errors can be obtained by a correction formula applied to the inverse of the information matrix. Some special models, like the factor analysis model and path models, are discussed in more detail. A method for evaluating the robustness condition is given.     

文化与科技融合的实现路径

文化发展与科技创新两者交织融合,科技创新是文化发展的重要引擎,文化发展也成为科技创新的引领。文化与科技融合本质是由科技突破和技术创新所带来文化产业在生产方式、消费方式、产业形态和产业结构等方面的变革,融合的核心是价值链重构,融合广泛发生在产业、市场、企业和生产要素等领域。目前,我国文化与科技的融合相对滞后,发展压力与发展机遇并存。从路径上来说,可从产业、市场、企业和人才四个方面实现文化与科技的融合。     

基于道路网络分析的省际粮食运输成本研究

借助GIS软件平台,结合铁路、水运航线、运费、转运费等数据,建立了道路网络数据模型,利用网络分析工具,分别获取了基于最低成本和最短运距下的两种运输路径及成本数据。对比分析发现:水路和铁路运输凭借其成本较低的优势在我国省际粮食运输中占据主要地位。在最低成本条件下,运输优路径经沿海和长江中下游航线频次最高,公路运输因其成本较高主要集中于省内或短途运输;省际粮食运输最高运费段为哈尔滨—拉萨段,总里程5 133km,经铁路一次性运输,运费为770元/吨;最低运费段为上海—南京段,总航程350km,经水路一次性运输,运费仅6元/吨。     

中国食品安全监管体系的演变和完善路径研究

本文通过历史性的视角,从监管理念、监管组织、法律法规颁布等纬度,对1949年以来中国食品安全监管体系的重要变化进行梳理,从食品安全监管需求、行政体制改革、国际食品安全理念影响和典型事件推动等角度,分析中国食品安全监管体系的变迁的背后动因,并提出完善我国食品安全监管体系的相关政策建议。