“四阶段法”中运量分配的路网断面剖切技术研究

针对"四阶段法"的运量分配过程中存在对路网动态变化的适应性反应迟钝、相关径路双向交流产生的大量回流量重复计算、通道交流量缺乏总量控制调节关键环节等问题,提出采用路网断面动态剖切技术,给出具体操作步骤和基本算法,并与传统运量分配方法进行优劣分析。通过宝中线运量预测的实例计算分析,说明断面剖切技术的实际应用。     

ECONOMIC GROWTH AND THE QUANTITY AND DISTRIBUTION OF EDUCATION: A SURVEY

Abstract The focus of this survey is to discuss different attempts at incorporating the distributional dimension of human capital into the theoretical and empirical growth framework. We present a series of models which deviate from the direct link between the aggregate or average level of human capital and economic growth in that they introduce the distribution of education as a new element in explaining the relationship under investigation. After surveying the theoretical literature, we present recent empirical work on the relation between economic performance and the average level, as well as the distribution of education, respectively.     

How to Construct a Random Probability Measure

This article presents an overview of several constructive methods for generating random probability measures. Applications of random probability measures include Bayesian statistics, average optimal control problems, average error bounds for numerical equation solving methods, and models for random distributions of mass in space.     

Online distribution of airline tickets: Should airlines adopt a single or a multi-channel approach?

In today's digital world, airlines typically distribute tickets both via their own websites and through online travel agency (OTA) platforms such as Expedia and Travelocity. Although associated with higher distribution costs, selling tickets through the platforms offers airlines exposure to a broader consumer base, and potentially higher sales than selling tickets solely through their own websites. While most airlines have adopted a multi-channel approach by selling tickets through OTA platforms and their websites, some (e.g., Southwest Airlines, easyJet and Ryanair) sell only via the latter. Is one approach better than the other, and if so, under what circumstances? This study analyzes factors that affect an airline's distribution strategy by developing a decision support model. We find that airlines are less likely to use OTA platforms if they have a large loyal consumer base or if the OTA platform is highly competitive.     

A CGE model of 'Dutch disease' economics in Taiwan

A computable general equilibrium (CGE) model of Dutch disease economics in Taiwan's economy is established in order to examine the impacts of the imbalanced growth in output, endogenous learning effects from imports and exports and the import tariff reduction. Twenty-nine industry sectors and five quintiles of households are taken to measure the changes in industry structure and functional distribution of income. An imbalanced growth, either from output or exports, contributes to the reduction in the share of manufacturing industry, but the deterioration in the functional distribution of income only happens to an imbalanced growth in intersectoral output. A widespread trade liberalization policy helps to mitigate the Dutch disease phenomenon in the sense that de-industrialization and deterioration of the distribution of income by an imbalanced growth in manufacturing industry are not so severe.     

Moments of Compound Mixed Poisson Distributions

Recursive formulae are derived for the evaluation of the moments and the descending factorial moments about a point n of mixed Poisson and compound mixed Poisson distributions, in the case where the derivative of the logarithm of the mixing density can be written as a ratio of polynomials. As byproduct, we also obtain recursive formulae for the evaluation of the moments about the origin, central moments, descending and ascending factorial moments of these distributions. Examples are also presented for a number of mixing densities.     

基于收入分布的收入差距扩大成因的分解

本文采用核平滑化的半参方法估计了1987年、1996年、2004年我国城市居民收入分布曲线,并且基于收入分布又进一步分解了导致城市居民收入差距扩大的主要原因。收入差距扩大的成因可以分为两类:一是劳动者的劳动力特点的普遍变化,如劳动者教育水平的提高,行业、职业分布的变化;二是对劳动力特点回报率的变化,如教育回报率的提高,各行业、职业回报率差异的扩大等。本文发现后者是导致收入差距扩大的主要原因。     

Improving distribution operations: Implementation of material handling systems

Academic research has primarily focused on the technical factors of material handling systems, with little or no discussion of human factors. In order to improve the performance of distribution operations, we found that the implementation of material handling systems involves both human and technical factors. These human and technical factors interact over time and go through three somewhat overlapping transitional stages. In the first stage, both human and technical problems exist; however, human problems dominate, and require conflict management skills to resolve. In the second stage, human problems improve, but technical problems persist, requiring formal problem-solving methods to resolve. Finally, in the third stage, both human and technical problems improve. It is important to recognize these transitional stages because they must be effectively managed in order for the material handling functions to perform at the optimal level. Implications of this research, including directions for future research, are also provided.     

租税制度与土地分配

秦汉以降 ,各朝政府均采田赋与丁银双重课税制度 ,但两税之比重各朝不同。史料显示 ,税收结构中若丁银比重高于田赋 ,则小土地所有人与无产农户受歧视 ,土地兼从并容易发生 ,土地分配趋于恶化。反之亦然     

长白山区作物气候生产力及其地理分布的研究

本文建立了长白山区玉米、水稻和大豆的气候可能产量模式和地理分布模型,计算了各地的气候生产潜力,并进行了地形影响订正。结果表明,长白山区主要农作物气候生产力的地理分布特征主要取决于地势、地形和经度,气候生产力随着海拔的升高按照三次抛物线函数递减,随着经度的升高按照线性函数递减。主要山体的南、西南坡气候生产力较高,北、东北坡气候生产力较低。该项研究为长白山区农业立体开发提供了综合气候生态依据。