An enhanced dynamic hash TRIE algorithm for lexicon search

Information retrieval (IR) is essential to enterprise systems along with growing orders, customers and materials. In this article, an enhanced dynamic hash TRIE (eDH-TRIE) algorithm is proposed that can be used in a lexicon search in Chinese, Japanese and Korean (CJK) segmentation and in URL identification. In particular, the eDH-TRIE algorithm is suitable for Unicode retrieval. The Auto-Array algorithm and Hash-Array algorithm are proposed to handle the auxiliary memory allocation; the former changes its size on demand without redundant restructuring, and the latter replaces linked lists with arrays, saving the overhead of memory. Comparative experiments show that the Auto-Array algorithm and Hash-Array algorithm have better spatial performance; they can be used in a multitude of situations. The eDH-TRIE is evaluated for both speed and storage and compared with the naïve DH-TRIE algorithms. The experiments show that the eDH-TRIE algorithm performs better. These algorithms reduce memory overheads and speed up IR.     

自然灾害下的公交疏散路线模型

自然灾害通常给社会带来巨大的危害,以自然灾害所引起的紧急情况作为研究背景,进行应急交通疏散预案研究。讨论自然灾害下的应急交通疏散问题并重点探讨疏散路线设计、疏散时间计算,用以达到在自然灾害发生前将人们转移至安全地点的目的。利用公交车作为疏散工具,将公交疏散路线问题归为带时间窗的车辆路径问题(VRPTW),建立基于VRPTW的公交疏散路线模型,以某地区为案例利用TransCAD软件中的车辆路径功能(VRP功能)设计疏散路线,得到标有疏散时间和疏散路线的地区图形,并最终计算得到每条路线的疏散时间、疏散人数、公交车数等信息。     

When natural resources run out,market knowledge steps in: Lessons on natural resource deployment from a longitudinal study in a resource-scarce region of Ethiopia

With the increasing scarcity of natural resources, the ability to maintain quality standards during resource-scarce times becomes more critical for business performance. Theories on managing resource scarcity cannot be easily tested in contexts where resources are still abundant. This study therefore turns to an emerging market context in which natural resource availability naturally varies strongly between seasons, namely, that of Ethiopian pastoralists who for many generations learned to adapt to natural resource scarcity. Central to our theory is the natural resource deployment capability, which is the ability of a business to make efficient and effective use of available resources to maintain business performance during resource-scarce times. Using three-wave longitudinal data from 120 pastoral family-based livestock businesses, the study shows that when resources are scarce or extremely scarce, market knowledge helps to better deploy the scarce natural resources, leading to higher product quality. The findings imply that businesses with a better understanding of markets have stronger natural resource deployment capability. The lesson for businesses that are confronted with approaching resource scarcity is therefore to strengthen their ability to deploy resources efficiently and effectively by strengthening their market knowledge in which such capability is rooted.     

提升我国文化软实力：价值、条件与路径

文化软实力已经成为综合国力的重要组成部分,文化竞争也已经成为国际竞争的战略制高点。提升我国文化软实力的重要价值在于文化软实力越来越深刻地影响着我国在国际上的地位和形象;越来越深刻地改变着我国经济发展的结构和格局;越来越深刻地彰显着我国广大人民的精神世界。我国经济实力的快速增强、文化需求的快速增长、科学技术的突飞猛进为提升我国文化软实力提供了良好的条件。提升我国文化软实力,必须加强社会主义核心价值体系建设,增强我国文化的凝聚力;继承中华民族优秀传统文化,提高我国文化的吸引力;振兴文化产业,增强我国文化的竞争力。     

琵琶教学中舞台实践能力的培养

琵琶是在舞台上与听众交流的艺术,是以舞台演奏为终极目的。舞台紧张与表演恐惧就像魔鬼一样可怕,它无时无刻地影响和制约着我们在台上正常水平的发挥。因此琵琶教学中,舞台实践能力的培养是不可缺少的重要环节。文章从舞台实践能力中必备的心理条件以及舞台实践能力训练的具体方法两大方面论述了琵琶教学中舞台实践能力的培养。     

On the origins of vertical unbundling: The case of the French transportation industry in the nineteenth century

Abstract

This paper retraces the origins of the unbundling of infrastructure, which is a monopoly, from services, which are subject to competition. Using the case of the railroad industry in France, I examine how both natural monopoly theorists and legislation dealt with this subject in the nineteenth century. I argue that the origins of vertical unbundling date to this period with legislation pertaining to inland waterways and railroads. This was particularly the case for the railroad industry due to pricing and competition rationales. I analyze the writings of Dupuit and Walras, and show that they both agreed that infrastructure and services had to be unbundled for the inland waterways. In contrast, they expressed different justifications to defend the monopoly for the railroad industry. Following a chronological progression, the first section explores the origins of unbundling in legislation. The second section analyzes how theorists approached the way railroads had to be managed. Throughout, I highlight the interplay between their work and legislation.     

Women and Minorities in Introductory Economics Textbooks: 1974 to 1984

The authors conducted a painstaking review of widely used economics textbooks to determine if or how issues relating to race and gender are treated. In doing so, the authors also shed light on the nature of the treatment of these issues.     

“Business and Government” Then and Now

Socio-environmental conflicts are widespread, and global economic growth will likely increase them in the coming decades. While political ecology, the analysis of common pool resources, and ecological economics, among others, have provided praiseworthy insights into such conflicts, institutional approaches to these phenomena are still scarce. Classical institutional economics has occasionally been put to work on environmental issues, but proposed frameworks remain relatively underdeveloped. We wish to contribute to institutional research on environmental issues by building upon Bruno Théret’s interpretation of John R. Commons’s transactional model and applying the framework to a case of socio-environmental conflicts. First, we briefly sketch the landscape of institutional contributions (especially those that follow the classical institutionalist tradition) to the analysis of environmental issues. We explain why Commons has largely been ignored on these issues. Then, we analyze some of the key concepts of Commonsian economics that are of particular interest to our theoretical elaboration. Following this, we depict Commons’s transactional scheme and propose an application to a case of socioenvironmental mining conflict in Peru. Our framework could complement existing ones and shed light on the institutional dynamics of natural-resource management through conflict.     

Adaptive Economic Models

The growth literature has identified four channels of transmission by which the abundance of natural resources can negatively affect economic growth. In this article, I suggest ideology as a fifth transmission channel. To test this hypothesis, I exploit the geography of Bolivia whose western regions have natural resources that differ considerably from its eastern regions. I find that regions with predominantly extractive natural resources tend to choose redistributive and interventionist rather than laissez-faire policies. Additionally, I identify two effects on growth depending upon the type of natural resource that a region possesses in abundance.     

GATS框架下我国关于自然人流动的法律调整

由于GATS对自然人流动的规范具有模糊性,各国容易设置很多自然人流动壁垒,加之我国劳动力状况还需要进一步提升,我国自然人流动的相关法律需要继续调整,主要是利用GATS给予发展中国家的便利,发挥政府的主导作用,从而推动我国服务贸易的健康发展。