我国工业企业自主创新效率研究——基于第三次全国经济普查数据

基于国家统计局提供的第三次全国经济普查数据,运用DEA基本模型和超效率模型,对我国31个省市规模以上工业企业自主创新效率进行评价.结果显示:我国工业企业自主创新效率并不理想,区域差异较大.北京、上海、浙江、安徽、湖南、广东、海南、重庆、贵州、西藏10个省市的综合效率为DEA有效,综合效率平均水平只有0.80;除上述10个DEA综合有效的省市外,吉林、江苏、山东3个省市规模以上工业企业纯技术效率为1,即为DEA弱有效;21个综合无效的省市RD活动均存在不同程度的规模无效,其中约48%的省市在人力和财力方面存在投入冗余问题,约88%的省市存在产出不足的问题.     

石油企业经济效益排序方法研究

应用数据包络分析 (DEA)技术 ,对石油企业的经济效益进行了科学评价 ,并使用简单效率和横切效率的概念 ,分别对非DEA有效决策单元和DEA有效决策单元进行了排序 ,为决策层对经济系统进行综合比较、评价提供了有效的技术经济手段。     

创新驱动战略下山东省区域自主创新效率评价研究

首先运用数据包络分析法(DEA)的CCR模型对山东省17个地市的自主创新效率进行横向评价,从投入指标和产出指标两方面分析非DEA有效区域存在的问题与有效改进值;然后运用全要素生产率指数(TFP)测算了山东省17个地市自主创新的Malmquist全要素生产率,对各地市TFP变动和自主创新效率发展进行了纵向评价分析;最后,根据评价结果提出了创新驱动战略下提升山东省区域自主创新效率的对策建议.     

石油企业经济效益排序方法研究

应用数据包络分析（DEA）技术，对石油企业的经济效益进行了科学评价，并使用简单效率和横切效率的概念，分别对非DEA有效决策单元和DEA有效决策单元进行了排序，为决策层对经济系统进行综合比较、评价提供了有效的技术经济手段。     

基于DEA模型的江苏木材加工龙头企业效率评价与分析

运用数据包络分析(DEA)模型,选取劳动力投入、科技投入和年消耗木材作为江苏木材加工企业的输入指标,产量和产值作为输出指标,对江苏省10家木材加工龙头企业进行效率评价.结果表明:江苏木材加工龙头企业的总体效率良好,DEA技术有效率达60%;DEA非有效企业的纯技术效率低于其规模效率,导致企业DEA非有效的主要原因是企业的资源配置不当;DEA非有效企业都存在输入冗余和输出不足,通过调整企业的要素投入比例,DEA非有效企业的输出指标都有较大提高.     

数据包络分析在城市土地利用评价中的应用

将数据包络分析(DEA)的理论与模型应用于城市土地利用效率的评价中，并以济南市为背景，用C^2R模型进行了实证研究．评价结果表明10年来济南市土地利用效率年际间虽有不同程度的变化，但总体上呈上升趋势．根据DEA有效性值，从土地投入产出两个方面分析了非DEA有效年份的原因，并根据计算结果提出了有效利用城市土地的建议．     

基于偏好DEA模型的江苏省技术创新效率评价

提高区域技术创新效率是区域自主创新能力建设的重要内容,也是提升区域竞争力的关键因素.在传统DEA模型的基础上,提出具有权重偏好结构的DEA模型,对2011年江苏省13个地市的技术创新效率进行评价研究.结果表明,偏好DEA模型对决策单元的评价区分度明显好于传统DEA模型.江苏省苏中地区的技术效率平均值最高,苏南其次,苏北最低;江苏省技术创新在规模效率上有较大不足,部分地市技术创新投入的利用效率较低,有待进一步改进.     

基于CCR模型和超效率模型的辽宁省高等教育效率测评

以辽宁省1997～2010年高等教育投入产出为研究对象,选取教职工人数、教育经费投入、研发经费的投入作为投入指标,选取本专科在校生人数、研究生在校生人数与专利授权数作为产出指标.利用DEA的CCR模型和超效率模型对辽宁省高等教育效率进行测评,1997与1998年为非DEA有效,规模收益递增,1999～2010年为DEA有效,规模收益不变.利用超效率模型能够对所有决策单元进行评价和排序,辽宁省高等教育效率由1999年扩招前的非DEA有效变成扩招后的DEA有效,并且投入产出效率呈逐年平稳上升之势.     

“一带一路”沿线省份高校科技创新效率研究

采用数据包络分析(DEA)模型构建了两阶段效率评价指标体系,评价了"一带一路"沿线省份高校科技创新效率。研究发现:知识创新产出方面,陕西、甘肃、广西、上海、广东、福建和海南等7个省份高校在技术和规模上实现了DEA有效;技术创新成果转化方面,陕西、甘肃、广西、上海、广东、黑龙江和重庆等7个省份高校在技术和规模都实现了DEA有效;从两个阶段综合效率平均值看,陕西、甘肃、广西、上海和广东等省份高校科技创新综合效率平均值为1,实现了DEA有效。     

基于数据包络分析法的铁路客运站能效评价

分析铁路客运站经济效益和旅客舒适度的影响因素,确定输出指标,以铁路客运站的各种能耗因素作为输入指标,用数据包络分析(DEA)模型进行线性规划求解,得出了客运站的总体效率、纯技术效率、规模效率和相对排序,提出了使非DEA有效的客运站达到DEA有效的途径.并通过比较各有效客运站能效的横切效率的大小,得出所有客运站能效利用情况的最终排序.对铁路客运站能效提高提出有针对性的建议,以期为改进和提高铁路运输质量和增强铁路运输的综合竞争力提供参考依据.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

英文诗歌中的喻类修辞

为了有助于提高英文爱好者的个人情操、文化素养和学习兴趣,以及专业人员对英语学习和研究进行多途径的探索,本文通过一些精选诗歌的引证和分析,着重论述了喻类修辞法在英文诗歌中的运用其及效果。     

Man Is Unable to Change the Miserable Life——Analysis of the Arrangement of Four Characters in The Glass Menagerie

Tennessee Williams is considered as one of the most important American playwrights since World War II.The Glass Menagerie is his first successful drama,which describes a tragic situation of family and means to say that Man is unable to change the miserable life,no matter whatever means he try,This essay focuses on the analysis of the arrangement of the four main characters:Laura.Amanda,Jim and Tom to reveal the theme.Laura is fragile.Amanda is brave.Jim is vital.Tom is sensible.And all of them develop and try the different means to struggle against life,but fail tragically.With the evidence,the paper comes to conclusion naturally that Man is unable to change the miserable life,and he dooms to fail.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

An Affordable Accurate Evaluation of the Binding Conformations Predicted by Molecular Docking Studies in Bio-System

正Recently,docking has been widely used to predict the binding-modes of protein-inhibitors,when the crystal complexes structure was absent.Most docking algorithms are able to generate a large number of probable conformations,it,however,is difficult to effectively evaluate these docking poses and identify the most reasonable bindingmode.In the present study,on the basis of the crystallographic data of human 3-hydroxy-3-methylglutaryl coenzyme     

WIMAX与WI-FI技术分析及联合组网

介绍了WiMAX与Wi-Fi两种无线宽带接入技术,并对两者之间的关系及相互之间的影响做了对比及分析,并对WiMAX的关键技术进行了详细说明,最后对两者的联合组网方式做了简单的探讨。