关于产业集群技术创新的若干问题

产业集群的蓬勃发展带动了我国区域经济迅速发展,但当前我国产业集群中企业创新不足的问题日益显现,阻碍了产业集群的进一步发展,而要强化产业集群技术创新,关键是探寻技术创新的实现路径,整合创新要素,做出有利于推进产业集群技术创新的战略选择.     

Generalized piecewise linear histograms

We extend the concept of piecewise linear histogram introduced recently by Beirlant, Berlinet and Györfi. The disadvantage of that histogram is that in many models it takes on negative values with probability close to 1. We show that for a wide set of models, the extended class of estimates contains a bona fide density with probability tending to 1 as the sample size n increases to infinity. The mean integrated absolute error in the extended class of estimators decreases with the same rate n^–2/5 as in the original narrower class.     

The adequacy of asymptotic approximations in the near-integrated autoregressive model with dependent errors

We consider the normalized least squares estimator of the parameter in a nearly integrated first-order autoregressive model with dependent errors. In a first step we consider its asymptotic distribution as well as asymptotic expansion up to order O_p(T⁻¹). We derive a limiting moment generating function which enables us to calculate various distributional quantities by numerical integration. A simulation study is performed to assess the adequacy of the asymptotic distribution when the errors are correlated. We focus our attention on two leading cases: MA(1) errors and AR(1) errors. The asymptotic approximations are shown to be inadequate as the MA root gets close to −1 and as the AR root approaches either −1 or 1. Our theoretical analysis helps to explain and understand the simulation results of Schwert (1989) and DeJong, Nankervis, Savin, and Whiteman (1992) concerning the size and power of Phillips and Perron's (1988) unit root test. A companion paper, Nabeya and Perron (1994), presents alternative asymptotic frameworks in the cases where the usual asymptotic distribution fails to provide an adequate approximation to the finite-sample distribution.     

对中国形成世界制造中心进程的冷思考

改革开放以来，我国迅速成为制造业大国，但还远远不是制造业的世界中心。只有认清我国制造业存在的预期利润低、结构不合理、产业链的低端定位、边际效应递减、研究与开发费用不足以及教育结构对制造业的瓶颈效应等问题，并对症下药，才能将我国的制造业真正做大做强。     

Regional job-turnover and industrial policy. a note on a potential time pattern of regional industrial policies and their job effects - the case of the german city-state of bremen

Many regions have experienced long-run economic fluctuations generated by the life cycles of their dominant industrial clusters. During the downswings in the 1970s and 1980s, proactive structural policies were typically launched in German regions to combat job losses in their core clusters and to create new jobs in new industries. With respect to the German State of Bremen, this paper provides empirical evidence of: (1) a long-run regional downswing; (2) the potential job effects of proactive regional industrial policy programmes in terms of increasing regional employment, by safeguarding jobs in the regional core industries and creating new jobs in new growth industries; and (3) a time pattern in the job effects, which are related to the different generations of programmes.     

长白山区发展效益农业的对策

本文在分析长白山区资源优势和生态环境特征的基础上，明确了发展生态环保型效益农业的基本思路和主导产业，提出了实施生态环保型效益农业的对策。     

推进西部大开发亟待全面深化对内开放

要实现西部大开发的伟大战略构想,改变西部经济落后面貌,缩小东西部差距最终实现西部地区的经济现代化,市场化和国际化,亟待全面深化对内开放,打破地区封锁,建立统一开放竞争有序的国内大市场,优化资源配置,调整产业结构,发挥区域优势,东西部进行合理分工,增强企业竞争力,使西部的发展融入全国全球的经济体系中.     

工业园区的物流建设

通过对我国工业园区的介绍,按物流活动特点对工业园区进行分类;介绍了我国工业园区的物流状况并提出提高园区物流水平的建议。     

浅谈现代物流产业的构成及存在的问题

目前,由五大行业组成的现代物流产业构架已基本形成,这对现代物流业的发展起着举足轻重的作用.文中就如何合理确立现代物流产业结构,合理配置资源方面谈及了自己的一些看法.     

东北老工业基地物流标准体系的构建研究

东北老工业基地的发展要求有快速高效的物流产业做支撑,而现有物流标准的多样性无法满足物流产业的发展需要,急需建立规范统一的物流标准体系.本文旨在枸建较为健全的中国东北老工业基地的物流标准体系,推动物流标准化战略,促进东北老工业基地物流体系效率的提高和物流产业的发展.