A Study of the Simulation Model in WCDMA Systems

Ｉｎｔｈｉｓｄｉｓｓｅｒｔａｔｉｏｎ ,ｗｅｅｓｔａｂｌｉｓｈａｎｅｎｄ ｔｏ ｅｎｄｓｉｍｕｌａｔｉｏｎｍｏｄｅｌｆｏｒｔｈｅｐｅｒｆｏｒｍａｎｃｅｅｖａｌｕａｔｉｏｎｏｆＷＣＤＭＡ/ＡＴＭ ｂａｓｅｄｔｈｉｒｄ ｇｅｎｅｒａｔｉｏｎｃｅｌｌｕｌａｒｓｙｓ ｔｅｍｓｗｈｅｒｅｗｅｔａｋｅｉｎｔｏａｃｃｏｕｎｔｔｈｅｑｕａｌｉｔｙｏｆｓｅｒ ｖｉｃｅｓｉｎｔｈｅｉｎｔｅｇｒａｔｅｄｖｏｉｃｅ ｄａｔａｅｎｖｉｒｏｎｍｅｎｔ.Ｔｈｉｓｄｉｓｓｅｒｔａｔｉｏｎａｉｍｓｔｏｐｒｏｖｉｄｅａｆｒａｍｅｗｏｒｋｆｏ…     

A Study on the Application Model of B2B E-Commerce in the Agricultural Sector

There are two main application models of B2B e-commerce, which are best suitable for agricultural sector. One is the e-market intermediation model (EMIM), and the other is the Integrative content center model (ICCM). Based on the analysis of these two models in application field of agriculture, a conclusion is drawn that these two models will be the main application ones of agricultural e-commerce at present, while ICCM will be a transition from local e-commerce to integrative e-commerce. The future development of agricultural e-commerce will follow the direction of integrative e-commerce which is based on the supply chain model on the E-Hubs. And a new framework of integrative e-commerce is presented as a conclusion at last.     

The Forecasting of the Development of Postal Services

1IntroductionInrecentyears,alongwiththereformofChina'seconomy,thesituationwithwhichthepostalenterprisesarefacedhavechangedalotinChina.Marketcompetitionsareget-tingmoreandmorefierce.Itisveryimportanttostrengthenforecastingofthedevelopmentofpostalservicesforimprovingthecompetitivecapacityofpostalenterprises,reducingthecostofmanpower,materialresourcesandfinancialowingtothemistakesofplananddecision-making.2TheRelationshipBetWeentheDevelopmentofNationalEconomyandthePostalServicesThenationaleco…     

A Study of Social System Design and Social System Problems in the Course of Reform

lintroductionAccordingtotheprinciplesofsystemscience,havingpurposesisthecommonnaturetoanysystemsll].Infact,thefunctionsofsystemshaveneverbeenseparatedfromtheirpurposes,andthebehaviorofthesystemsistheprocesstoachievetheirpurposesormoreclearlytheirobje...     

A Study of the Development of the World Postal Parcel Service

Inrecentyears,themarketproportionofthepostalparcelservicehastakenonadescendingtrendallovertheworld .Meanwhilethemarketcompeti tionhasbecomesharperandsharper.ManyPostsintheworldareenergeticallyexploitingthemarkettoadvancetheirpostalparcelserviceandseekingforcollaborationtostrengthentheirmanagementofthepostalparcelservice.1　TheAnalysisontheMarketofPostalParcelService　　Accordingtothedocumentsinthe“ThePlanfortheDevelopmentofPostalParcelService 2 0 0 1～2 0 0 4”supportedbytheUPUPostalPa…     

A New Method for the Development of Posts and Telecommunications Information System

ＡＮｅｗＭｅｔｈｏｄｆｏｒｔｈｅＤｅｖｅｌｏｐｍｅｎｔｏｆＰｏｓｔｓａｎｄＴｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓＩｎｆｏｒｍａｔｉｏｎＳｙｓｔｅｍＺｈａｎｇＦｅｎｇａｎｄＹａｎｇＪｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｐｕｔｅｒＥｎｇｉｎｅｅｒｉｎｇ，...     

Study on Differential Demodulation System of Laser Doppler

To meet the seism detection‘ s require of high accuracy, high resolving power, the measurement technique of Laser Doppler and detection technique of faint signal are further researched. A differential demodulation system of Laser Doppler is designed. Phase grating is adopt to obtain same intensity measured beams with big separative angle in the system, and by focusing the waists of two Gauss beams on the measured object with extender and collimating lens group, the smallest speckle and the superposition of plane waves are obtained. And because the big diameter lens is used to collect scattered light,the Doppler signal of high SNR is obtained. It‘s measured range of frequency and amplitude respectively are 0.3～1000 Hz, 1.5～5mm. And the measure accuracy of amplitude and frequency respectively are 1% and 0.4%.     

An Empirical Study on Telecommunication Development in the Rural Areas of China ''''s 12 Western Provinces

1IntroductionThe installation of telephone has grown rapidly inChina. The urban market has been nearly fully occu-pied , while rural areas , especially those in westernprovinces have becomethe ai mof telecomenterprises .Itshould be noticedthat large disparity exists amongtheserural places , while there are much general discussion onthe underdevelopment of telecommunication in westernparts ,fewspecific studies have beenfocused ontheir di-vergence, with even fewer using quantitative analysis .T…     

A Study on the Finite Difference Approach of the Surface Laplacian

The surface Laplacian of bioelectrical activity was first applied to the Electroencephalogram (EEG) by Hjorth[1]. In the field of ECG, the body surface Laplacian mapping was also developed to provide better spatial resolution than the body surface potential distribution[2]. There are generally two kinds of estimation of surface Laplacian: local methods and global methods. The former calculate the difference of potentials recorded from neighboring electrodes[1]. The latter are based on the…     

A Study on Turbo-Codes in Asynchronous DS-CDMA

1Introdu~ctionSincethe~odeswasProposedbyC.Berm[l],itsamuSingermrcorrectingcapabilityhas~muchattention12-6].InmostPapers,~shavebeenconsideredunderaddedwhiteGaUSsiannoise(AWGN)channel.AJthoughD.InvsalarandF.Pollara[2]haveconsidereditsaPPlicationtOPCS,thechaxmelisshllAWGN.TheaPPlicationofturbo-codestOasynchronousDS-CDMAhasnotyetbeenconsideredindetail.Inthispaper,weconsiderorthogonallturbocodesforasynchronousDS-CDMAcolnmwhcationsfornoncoherentM-acorthogonalmodulationinmulhpathfad…     

基于ARMA模型的电力系统负荷预测方法研究

采用加权最小二乘法参数估计方法，得到应用于电力系统日负荷预测和月负荷预测的ARMA模型，实验预测结果表明，用ARMA模型进行电力负荷预测是非常有铲的。尤其是采用加权最小二乘估计的ARMA模型，预测精度更高。     

电力系统负荷预测方法综述

电力系统负荷预测关系到电力系统的调度运行和生产计划,准确的负荷预测有助于提高系统的安全性和稳定性,能够减少发电成本。随着电力市场的建立和发展,短期负荷预测将发挥越来越重要的作用。文中系统分析了电力系统负荷预测的相关方法,包括传统负荷预测方法、基于人工智能的负荷预测方法、时频分析的动态预测方法以及动态过程描述的负荷预测方法,对各种不同方法的基本原理和优缺点进行了描述。最后,文中认为实用的负荷预测方法应该是结合各种预测模型优点的组合方法。     

基于自适应神经模糊推理系统的城市电力需求及预测模型

城市年度电能消耗数据具有较强的非线性特点。科学预测城市电力需求,是一项重要的基础性工作,需要有一种较为简易又有足够精度的预测方法。运用神经网络较强的非线性映射能力和模糊推理系统计算量小的特点构造了基于自适应神经模糊推理系统的城市电力需求及预测模型。经实证分析及与ARIMA方法的对比,结果表明,该方法适用于长中短各期预测并有很好的预测效果。     

电力系统负荷预测方法综述

从电力系统负荷预测关系到电力系统的调度运行和生产计划,准确的负荷预测有助于提高系统的安全性和稳定性,并可减少发电成本。文中介绍了通过引入其他领域的理论来改善电力系统负荷预测的分类、模型以及预测的方法,同时对其发展动态进行了展望。     

非对称多核体系下的阿姆达尔定律性能模型研究

阿姆达尔定律研究并行计算的性能并指出任务的极限所在,为了突破这一瓶颈而提出的非对称多核硬件架构则需要适合的性能模型来支撑其理论价值.新的量化模型引入了具体的核配置等参数,通过分析比对两种架构下的加速比,得到了任务性能在非对称体系上优于对称架构的结论.该模型同时发现,遵循一定的设计规则来转换对称体系至非对称架构可以很大程...     

计算机—电话集成系统国际标准总线：MVIP

本文较全面地介绍了计算机－电话集成系统国际标准总线ＭＶＩＰ的体系结构，按照国际标准化组织的ＯＳＩ参考模型，将整个系统划分为六层，并分层进行了功能描述。该协议的形成，将不同厂家的不同技术和功能模块集成在一起，建立标准的呼叫处理综合体系结构。     

基于ARIMA-TARCH-BP神经网络模型的中长期负荷预测方法

中长期负荷预测是电力系统规划运行的重要基础。针对经济转型阶段多样化负荷呈现的强波动性致其预测精度难以保障的问题,利用电力负荷历史统计数据建立ARIMA-TARCH模型,对负荷时间序列的非平稳性、自相关性和非对称波动特性进行分析,并结合BP神经网络理论对负荷拟合残差值进行修正,进而对目标规划年的负荷进行预测。最后,以我国某地区的实际电网负荷为算例,预测未来五年的负荷变化趋势,验证所提预测方法的可行性和有效性。     

本地网机房环境集中监控系统的研制

本文提出在本地电话网风管与集中监控系统ＮＯＭＡ平台上研制机房环境集中监控系统，实现本地电话网的综合网管。该系统已研制的成功，并已经应用于实际中，取得良好的效果。     

基于气象因素敏感模型的短期电力负荷预测

为了充分考虑地区电网短期负荷易受气象因素影响的特点,提出了一种具有天气敏感性的基于快速BP算法的神经网络预测模型,模型中合理地考虑了影响负荷变化的主要气象因素,使其能够适应天气的变化。通过对咸阳地区电网的仿真预测,证明了天气因素敏感模型应用于地区电网短期负荷预测后使预测精度明显提高,故建立的模型是可行和有效的。     

自动电话系统任务可靠性建模的探讨

通过对几种任务可靠性模型的比较,基于和联系统及任务重要度的概念,利用布尔真值表法建立了自动电话系统任务可靠性模型,并列出利用几种模型计算的任务可靠性度,将其进行比较,为自动电话系统任务可靠性预计提供了合理的数据,为准确预计系统任务可靠性奠定了基础。