基于单片机的智能公交系统设计

为了提高公交系统运行的智能化、信息化水平,在分析智能公交系统应具有功能的基础上,设计了采用无线跳频通信的公交系统,主要包括公交系统和站台系统,并提出了硬件和软件实现系统。研究结果表明:该系统采用无线通信技术传输站台信息,能完成自动化公交车语音报站和公交车站台预报车号,并对公交车实行智能调度;该系统实现了准确掌握车辆实时运行情况,乘客能及时了解车辆到站情况,提高了公交管理、调度的智能化和信息化水平。     

GPRS—ZigBee技术的公交车智能监控系统

针对公交车运行中无法实时掌握运行状态等问题,运用GPRS和ZigBee技术设计了以ARM7芯片S3C44B0X为主控制器的智能监控系统。该系统由公交车监控中心、公交车站台监测器和公交车体智能无线终端组成。该系统实现了公交车自动语音和LED屏报站,可通报公交车运行状态和到站时间。该系统功能完善,可以作为新一代公交监控系统推广使用。     

常规公交站台容纳线路能力计算模型

从公交站台停靠线路数和线路特征入手,运用排队理论建立公交站台容纳线路能力的计算模型.该模型充分反映了公交车到达特性对公交站台通行效率的影响,从理论上计算公交站台车位数与站台容纳线路及线路特征的定量关系,为公交站台的车位数以及线路数的设计提供理论设计依据.运用该模型对南京市某公交站台进行了实例分析,对公交站台的线路数进行了优化分析.从实例计算结果可以看出,公交站台的实际流量小于其通行能力,但仍常出现公交车排长队现象,导致站台内拥堵,其原因主要是公交车到达的不均匀性.合理设置站台的线路数和线路发车频率可以有效地控制站台内公交车的排队长度,减少公交车在站的运行延误.     

基于公交的农村物流配送模式优化设计

优化农村物流配送模式是促进农村物流发展的关键.文章首先分析农村地区物流及城乡公交客流的特征,提出了依托公交的客货联运配送模式;其次对该模式下的农村物流配送服务网络、公交车辆、公交站台、运输组织、物流信息平台进行优化设计;最后对基于公交的农村物流配送模式的优化方案进行评价.研究结果表明:合理地利用公交车闲置资源,可以实现...     

基于多传感器及网络信息融合的公交调度系统建模与仿真

为解决城市交通严峻的拥堵问题,提出一种基于实时交通信息的公交调度系统优化模型。将公交基础设施与多种分布式传感器设备联合,构建终端交通信息监测系统网络,实时采集公交信息。利用视觉候车人数检测系统、IC卡及GPS等实现上车人数的检测,通过公交车内置摄像机对下车人数统计,根据3D模型车辆识别法对车流量统计,并且由公交查询软件实现了基于"互联网+公交"大数据技术的实时公交信息挖掘。然后由网络传输系统将各区段乘客信息迅速反馈至调度总部,最终实现有效地公交系统调度。由基于Extendsim及元胞自动机的仿真表明,文中设计的系统模型能够有效地改善城市交通系统调度的实时性与精准度。     

公交出行OD信息获取方法研究

以往通过人工调查获取公交车出行OD的方法既费时又费力,随着城市公交系统的完善,使用公交IC卡已经成为常住居民的习惯,通过对IC卡数据进行挖掘,结合集合论的数学方法来实现居民公交OD出行信息的提取,不但节省了人力物力,在精度上较人工调查也要更高。方法通过数据挖掘,分别建立IC卡刷卡记录表、公交车到站信息表及公交线路信息表,以此可以准确获取IC卡的上车信息,同时在假设公交出行链闭合(前后两次出行均为公交出行)的前提下,以集合论为基础建立了相应的下车站点推算模型,实现了OD出行信息的提取。     

基于不完全数据的公交排队系统分析

公共交通系统是一个典型的提供成批服务的随机服务系统。国内对于公交排队系统的研究大多以公交IC卡的统计数据为基础,把公交站台当作服务台、乘客当作服务对象。面对中小型城市缺乏完备有效数据的困境则应该转换思路。本文以绵阳市公交系统为研究对象,得到若干公交站点进出站时间的数据集,计算公交车到达指定站点的时间间隔。在确定公交车到达的平均速率符合泊松分布的前提下,建立单服务台,以公交车辆为服务对象的随机服务系统模型,研究分析该站点周期性的客流变化以及拥堵情况。     

智能公交信息服务系统设计

基于目前公交信息服务系统中各子系统的协调能力差的情况,设计了由公交信息管理中心、车载集成系统和站台服务系统等子系统构成的智能公交信息服务系统.这些系统通过相互协调和配合来实现智能服务功能,在特定的交通状态下利用关联规则来选取合适的行程时间预测模型,从而提高行程时间预测的准确度.     

一种智能公交车载系统的研制及性能分析

给出一种城市公交智能管理调度系统的总体解决方案,阐述该方案中智能公交车载系统的设计与实现方法,详细论述其硬件和软件设计的关键部分.提出一种基于新型检测模块的全新客流量采集方法,与其他方法相比可知,该方法能以较低的成本获得实时准确的客流量数据;车载系统充分利用蓝牙模块实现公交车定位、自动报站、数据传输以及数据无线更新等功能;针对车载系统接入站台系统的接入能力,运用排队理论建立数学模型并进行仿真分析,结果表明该车载系统能够成功接入站台系统.     

基于DSP＋GPS公交收费系统的终端设计

提出了基于GPS公交车收费系统的终端的设计方法,该设计主要充分利用DSP处理数据速度快的特点;本系统主要实现3大功能,一是采集坐标信息,利用GPS采集公交车经过的站点位置的经纬度;二是采集非接触式IC卡用户口的信息,得到IC上的金额,三是将采集到的用户口信息以及位置信息通过GPRS模块传输到服务控制后台,由后台控制中心来处理乘客在一次坐车中所花费的总费用.为了乘客刷卡的方便,应在每一辆公交车中安装两个这样的系统,一个是安装在车的前面用来采集乘客上车时的位置信息,以及IC上的金额,另一个是安装在车的后面用来采集乘客下车的位置信息,并通知这次乘车所花费的金额以及IC上所剩的金额;本系统可以根据乘客所乘的实际距离来收费,而不是现在公交车单一的收费标准,使乘坐公交车收费更加合理,更加科学;本系统是在嵌入式系统L inux平台下实现,实用性强、操作简单、扩展功能强.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with