公交电子站牌问题与智能公交管理信息系统建设的系统性管控

1.摘要公交电子站牌是智能公交管理信息系统的一个子系统和面向公众的一个窗口,对智能公交管理信息系统建设中的各个相关子系统的系统性管控,是解决公交电子站牌建设过程的各种问题的主要途径。     

成果撷英

公共交通乘车信息服务系统 多年来的发展经验证明,单靠修路是解决不了交通拥堵问题的,而建设包括公交在内的智能交通系统去应对这一棘手问题已经成为世界各国的共识。目前北京已经初步建立了公交车运营调度指挥系统,力求通过卫星定位和信息化传输等处理手段来加快首都公交管理智能化的步伐。公共交通乘车信息服务系统作为智能公交的重要组成部分,可以向乘客提供及时准确的出行信息。 公共交通乘车信息服务系统可根据全球定位系统在电子站牌上显示出公交车所在位置,让候车的乘客心中有数。今后,在长安街日坛路乘坐“1路”公交车的乘客再也…     

基于云计算的电子公交站牌系统设计与实现

通过对传统和现已商业化实施的电子站牌的需求分析,基于云计算的方法设计与开发了电子公交站牌系统,详尽地分析了该系统的具体功能需求,对站牌、数据通信、数据中心访问等核心部分进行了功能设计,并尝试在Google云计算平台下采用GWT技术,实现公交车智能化报站及显示功能,有效地解决了传统电子公交站牌报站显示不准确的问题.     

初始公交网络优化模型的研究

智能公共交通系统是智能运输系统的重要研究内容,是将信息、通信控制、卫星定位、计算机网络等技术科学集成应用于整个公共交通系统当中,解决公交车辆运行中处于无序、失控与低效率状态,以达到更好地为乘客服务的目的.本文主要研究用于智能化调度下的公交初始网络优化模型,完成初始网络的建立并提出优化思想.     

一种粘贴式LED公交智能站牌

设计了一种城市智能公交站牌,给出系统软/硬件设计方案。该系统以STC12LE5A60S2芯片为控制核心,通过SIMCom有限公司的SIM900A芯片对公交信息服务器发送的GPRS数据进行接收,并通过站牌上LED灯的闪、亮、灭显示此线路上游来车位置信息。LED灯通过粘贴方式粘贴在现有公交站牌的站点名称上方或下方,可为乘客提供方便、直观的公交实时位置信息,经济性好,易于改造施工。     

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.     

GPS电子站牌现身沪上

从公交管理部门获悉，公交71路沿线凯旋路、定西路等公交站点在近期已安装上了多功能电子站牌系统。它们将成为今后上海公交电子站牌的标准模式，并率先在巴士四汽的两条线路公交71路、72路沿线投入试运行。     

珠海市公交智能调度系统及电子站牌项目简介

公交智能调度系统是交通部2004年到2005年交通信息重点建设规划里面提到的公众出行信息系统的核心内容，它可以从根本上解决候车的盲目性，为群众提供了更多的方便。它一是要求在公共汽车侯车亭上建设电子站牌，将经过该站的公汽线路、车辆离本站的距离和时间等信息实时显示在电子站牌上，方便市民使用；二是在公众网上发布实时公交信息，方便市民制定出行计划。     

北京市公共交通智能化调度管理系统的建设与开发

公交智能化调度系统的基本目标是解决公交车辆运行中处于无序、失控与低效的状态与首都公交可担负城市旅客出行的主导地位不相适应的矛盾,就是要把通信控制、卫星定位、计算机网络与运营组织科学地结合起来,运用系统工程的理论方法进行综合集成,实现集运营指挥调度、综合业务通信、乘客信息服务等为一体的智能化公交管理系统．本文在阐述公共交通智能化调度系统的基本结构的基础上,着重分析了系统的综合集成模式,并对各子系统的功能结构进行了详尽的论述．     

可拓综合评价城市公共交通服务质量

城市公共交通系统是城市各子系统中最复杂的系统之一,应用可拓学理论构造基于可拓综合评价方法的评价模型.从可用性、便捷性、感知度三个方面构建评价指标体系,将定性指标转化为定量指标,从而较准确地反映公交服务质量.最后举例表明可拓学理论方法能较真实地反映城市公共交通的服务情况.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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     

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.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

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.     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to