中国电信产业市场化改革绩效的动态博弈分析

运用规范的产业组织动态博弈模型,对20世纪90年代以来中国电信产业市场化改革绩效加以研究,结果表明:不对称结构下在位厂商的策略性行为会扼制进入厂商,阻碍市场竞争;纵向分割虽导致双重加价,但却从根本上推动了电信竞争;横向分割初期的统一定价管制和网络竞争导致的用户信息不对称会阻碍本地网接入竞争,应通过移动厂商基于终接的差别定价和用户信息甄别措施来增加社会福利。     

陕西公路平纵线形指标

在汽车动力性能分析和工程经济技术论证的基础上，通过理论分析和现场调查的方法，对比分析现行公路工程技术标准在陕西公路建设中的适用性，提出了陕南秦巴山地和陕北黄土高原地区高速公路和一级公路最大纵坡建议值(4％～6％)不设超高平面最小半径的建议值。研究结果进一步完善了现行公路技术标准，同时为陕西地区的公路设计提供指导依据。     

数据融合技术在多滚轮法大轴径测量中的应用

为克服单一传感器的不确定性和局限性，全面而准确地描述被测对象，充分利用多传感器之间的协调和互补优势，采用多传感器数据融合技术，设计了多滚轮法大轴径测量系统。该系统利用电位移传感器、光栅测角、光电测转数、压力测量等系统以及温度传感器、多路温度巡测仪，对不同时间和空间的测试数据进行融合、处理，极大地提高了测量系统的性能和效率，可得到高精确度的大轴径测量尺寸。     

无线局域网的安全性问题研究

本文从无线局域网使用的技术出发,分析了无线网络相关的技术和安全机制,并结合其以后的发展,提出了在安装、调试、管理和使用无线网络过程中提高安全性的措施.     

Experimental Studies on Ultrasonic Vibration Grinding of the Workpiece Made from Fine-crystalline Zirconia Ceramics

The performances of fme-crystalline zirconia ceramics in workpiece ultrasonic vibration grinding （WUVG） and conventional grinding （CG） with diamond wheel were researched. The effects of WUVG and CG on material removal rate, grinding forces, surface roughness and microstructure of zirconia ceramic were investigated. Experimental results indicated that： （1） The material removal rate （MRR） in ultrasonic grinding process is two times as large as that of in conventional grinding. The material removal rate increases with increasing grinding depth in both ultrasonic grinding and conventional grinding. （2） The ultrasonic vibration grinding force is lower than that of conventional grinding force, and the increase of the worktable speed leads to a decrease of the grinding force, while the grinding force increases with larger grinding depth in both WUVG and CG. （3） The surface of ultrasonic vibration grinding has no spur and build-up edge and its surface roughness is smaller than that of CG significantly. Surface quality of WUVG is superior to that of conventional grinding, it is easy for ultrasonic vibration grinding that material removal mechanism is ductile grinding.     

3~6岁幼儿多元智力问卷编制及分析

对编制的3~6岁幼儿多元智力问卷进行分析.513名3~6岁幼儿接受测验,使用SPSS 11.5和Am os 4.0软件对所得数据进行分析处理.该问卷有较好的内在信度和内容效度,问卷的克隆巴赫а系数为0.9459,验证性因素分析表明测量数据与量表结构拟合良好.结论:该量表具有良好的心理测量学指标,3~6岁幼儿多元智力的维度是语言智力、数学逻辑智力、身体运动智力、音乐智力、视觉空间智力、人际交往智力、自我认识智力、自然观察智力.     

GSM无线网络优化

先后对GSM无线网络的发展情况以及目前存在的问题进行了介绍,阐述了GSM无线网络优化的技术难点.介绍了BCCH载波与TCH载波的频率配置、信号衰落算法、干扰原理、动态功率控制的调节思路,以及提高网络质量,改善小区登陆与切换性能的措施.介绍了GSM900整体优化思路,以及实施效果.     

A DYNAMIC APPROACH TO CALCULATE SHADOW PRICES OF WATER RESOURCES FOR NINE MAJOR RIVERS IN CHINA

China is experienciug from serious water issues. There are many differences among the Nine Major Rivers basins of China in the construction of dikes, reservoirs, floodgates, flood discharge projects, flood diversion projects, water ecological constructions, water conservancy management, etc. The shadow prices of water resources for Nine Major Rivers can provide suggestions to the Chinese goverument. This article develops a dynamic shadow prices approach based on a multipeziod input-output optimizing model. Unlike previous approaches, the new model is based on the dynamic computable general equilibrium （DCGE） model to solve the problem of marginal long-term prices of water resources. First, definitions and algorithms of DCGE are elaborated. Second, the results of shadow prices of water resources for Nine Major Rivers in 1949-2050 in China using the National Water Conservancy input-holdiug-out in table for Nine Major Rivers in 1999 are listed. A conclusion of this article is that the shadow prices of water resources for Nine Major Rivers are largely based on the extent of scarcity. Selling prices of water resources should be revised via the usage of parameters representing shadow prices.     

高频金融时间序列的协同持续关系研究

对向量高频时间序列的“已实现”协方差阵提出相应的模型并建立了“已实现”向量自回归模型.应用Bollerslev和Engle提出的持续和协同持续概念,讨论了“已实现”向量自回归模型存在线性协同持续的充要条件和寻找这种线性协同持续向量的方法,在此基础上进行了实证分析,表明沪深两股市之间不存在线性协同持续关系.最后指出协同持续概念在动态组合投资、风险规避策略中的意义和作用.