小波变换在图像压缩中的应用

近十几年来小波理论研究已成为应用数学的一个新方向.作为数学工具,小波被迅速应用到图像和语音分析等众多领域.本文试图从工程和实验角度出发,较为直观地探讨小波变换在图像压缩中的应用.     

下营坊一带不对称褶曲的构造特征、形成条件及控岩控矿意义

本文着重介绍了下营坊一带主要构造格架—ＮＥ向Ｓ状不对称褶曲的几何特征、形成机制、变形环境及控岩控矿作用。通过区域应力场分析及岩组分析，揭示了该区在ＮＥ向左行斜冲剪切机制下，元古界层状岩层因上、下界面的滑脱剪切所造成的交形效应以及所处的中温低压变形坏境。不对称褶曲的翼部地层的顺层滑脱和转折端部位的虚为本区中酸性岩浆活动提供了侵位通道和空同。向ＳＷＷ倾伏的不对称褶曲的背斜转折端与ＥＷ向及ＮＮＥ向复合构造控制下营坊南梁斑岩型铜矿。     

An analysis of repressed inflation in two transition economies

We construct a simple model that tests for repressed inflation by estimating a true rate of inflation that explains behavior of observed money demand. We estimate the model using quarterly data for Czechoslovakia and Poland. Although our results should be viewed as preliminary, given the imperfect nature of our data, we do have strong evidence that, prior to 1991, there was considerable repressed inflation in Poland, while there was essentially no repressed inflation in Czechoslovakia.This paper was funded by a World Bank project on formerly planned economies. We would like to thank Jong-goo Park for suggesting the topic, and Fabrizio Coricelli and Adnan Mazarei for helpful discussions. The views expressed here are our own and do not necessarily reflect the opinions of the World Bank.     

基于因特网的工程项目环境信息库研究

在工程项目建设过程中，项目经理（业主方）需要查阅和使用项目所处的环境信息。本的目的是探讨利用当代信息技术如何建立一个信息库，为项目经理及时提供全面和准确的环境信息，通过访问专业人士，查阅献，分析典型工程实例，并结合作的工程实践经验，从系统的角度定义了工程项目经理所需用的环境信息，确定了它的分类，建立了它的概念模型，并且详细地介绍了该信息库的技术实现途径。     

Population Aging and the Possibility of a Middle-Income Trap in Asia

We present three conditions for a demography-driven middle-income trap and show that many economies in East, South, and Southeast Asia satisfy all of them. The conditions involve (1) the support ratio of workers to consumers has an impact on economic growth, (2) economic development accompanies more investment in human capital and lower fertility due to the quantity–quality trade-off, and (3) a current low level of fertility corresponds to very low support ratios for keeping up with frontier economies in the long run. Panel analysis for 178 countries shows that (1) and (2) are satisfied for Asia with higher elasticity than others. As for (3), we set up a dynamic model for simulations, showing that approximately two-third of Asia’s developing countries have an unsustainable level of support ratios, implying possibility of a middle-income trap due to future demographic headwinds.     

郊区工业发展现状及对策分析——以天津市为例

随着都市经济的发展,市区工业逐渐由向郊区转移是必然的趋势.近年来郊区工业发展速度在不断提升,产值不断增加,对经济和社会的贡献明显提高.以天津为例,通过总结天津郊区工业发展取得的成果,评价发展进程,分析发展中存在诸如实力不强、产业集中度不高、园区特色不突出、竞争力不强等问题,借鉴发达地区的经验,提出了天津郊区工业发展的路径和对策性建议.     

Digital gaming culture in Vietnam: an exploratory study

ABSTRACT

New information and communication technologies continue to spread rapidly into the Asian marketplace, which has led to new patterns of leisure consumption, one of the most popular being digital gaming. However, in Vietnam there is limited research on gaming as a leisure activity. The purpose of this study is to explore the phenomenon of digital gaming in Vietnam to better understand how it is practiced in this culture. Semi-structured interviews were conducted with twenty-five gaming industry figures and gamers. Thematic analysis was used to guide data collection and analysis. The findings indicate that glocalisation, socialised gaming practices and competitiveness characterise the Vietnamese gaming experience. The distinct culture of Vietnam combined with globalised gaming consumption habits has created new modes of play culture, and hence leisure experiences that are growing in pervasive and influential ways.     

Does foreign investment benefit the exporting activities of Vietnamese firms?

Using firm-level data, this paper examines the effects of foreign investment on the exporting behaviour of domestic firms in the Vietnamese manufacturing and service sectors. Applying the Heckman selection model on panel data and following the Wooldridge approach, we find that investment by foreign firms has a significant positive effect on the decision of domestic firms in the same and upstream sectors to export. The proportion of exports of domestic firms declines through horizontal and forward linkages, but increases through backward linkages in the manufacturing sector. However, there is only weak evidence in support of export spillovers on domestic firms in the service sector. We also find that the presence of foreign firms has differing effects on the exporting activities of low- versus high-tech firms in the manufacturing sector.     

FDI与东道国企业的能源效率——以江苏高新技术企业为例

FDI在促进东道国经济规模扩张的同时,也会对企业能源使用效率产生一定的影响。本文利用江苏省1988家高新技术企业样本数据,试图揭示FDI与企业能源效率的关系。研究结果显示,虽然FDI对企业能源效率有正向影响,但来自不同国别（地区）FDI的促进作用存在明显差异,非港澳台地区FDI较之港澳台地区FDI对企业能源效率的提升作用更为显著,这可能与不同来源地跨国公司所有权优势的差异以及FDI在中国大陆投资的不同动机有关。同时,本文还发现,研发创新、人力资本以及国有资本份额也对能源效率产生比较显著的影响,而产业集聚因素对能源效率影响不明显。     

桩端注浆超长灌注桩的极限承载力研究

为提升后注浆超长钻孔灌注桩的承载性能,以静载试验数据为基础,对3根后注浆超长钻孔灌注桩的桩侧阻力、桩身轴力以及荷载-沉降等因素进行了系统分析.通过拟合Q-S曲线预测了单桩极限承载力,并利用有限元模型分析了桩端注浆桩单桩承载力的影响因素.研究表明,1)桩端注浆超长桩的Q-S曲线变形缓慢;2)桩身荷载主要由下部土层决定;3...