排序方式: 共有94条查询结果,搜索用时 15 毫秒
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基于三重模式的长江堤防信息系统的研究与实现 总被引:1,自引:0,他引:1
分析了长江堤防工程的地质勘察及施工信息,提出了一种基于Client/Server,Browser/Server,Browser/ArcIMS三重架构的开发模式,构建了系统的体系结构.对后台数据库进行了优化和重组,提出了一种基于树形数据结构的"超"实体多级递归算法,给出了无限层次的动态下拉列表实现方法.引入面向对象技术,采用多种开发工具,开发了长江堤防工情信息服务系统软件,实现了DBMS与GIS的集成一体化. 相似文献
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针对Smart River 2011会议,介绍了Smart River在内河电子航道图、RIS系统及其应用,以及其他有关Smart River的最新发展情况,同时介绍了我国长江电子航道图、信息服务,及其他内容的发展近况。通过对比分析,认为我国在下一步内河航运发展中,应全面统筹发展。在着力电子航道图的全面发展,加强内河航运信息服务的同时,大力发展公铁水联运。同时要注意保证船员适任性,灾难应急的处置。环境的保护、规划选址方法也应该得到充分的重视。 相似文献
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This study investigates the impacts of transit improvement strategies on bus emissions along a busy corridor in Montreal, Canada. The local transit provider, Société de Transport de Montréal, has implemented a number of strategies which include the use of smart cards, limited-stop (express bus) service, and reserved bus lanes along this corridor. Using data collected on-board for instantaneous speeds and stop-level ridership, we estimated bus emissions of greenhouse gases and other pollutants at three levels: road segment, bus-stop, and per passenger. A regression of segment-level emissions against a number of explanatory variables reveals that reserved bus lanes and express bus service reduce emissions significantly. On the other hand, smart card use reduces idling emissions compared to other fare payment methods. Our findings are of most relevance for transit planners who are seeking to implement different strategies to reduce emissions and improve transit performance. 相似文献
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本文设计的汽车智能电子防盗器主要依托GSM网络进行实时传输数据,经由单片机接收信号控制TC35i模块收发短信。运用了嵌入式技术,GSM无线通讯技术,使用手机作为控制平台。当车辆被恶意破坏时,单片机控制TC35i发送短信给车主,让车主第一时间知道车辆的情况,防止被盗。 相似文献
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本文从企业信息化角度介绍东风汽车公司协配件价格管理系统的开发方案 ,探讨了基于客户 /服务器架构进行程序开发和系统实施中若干经验和体会 相似文献
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基于Smart Client的工程管理信息系统框架分析 总被引:1,自引:0,他引:1
随着中国基础建设高峰到来,工程项目管理信息系统(PM IS)必将是大型基建工程项目管理的重要手段。阐述了基于Smart C lient模式PM IS的优点,并着重分析系统基本框架,提出了一般性设计原则,为PM IS开辟一条全新的研发思路。 相似文献
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Upward expectations of future electric vehicle (EV) growth pose the question about the future load on the electricity grid. While existing literature on EV charging demand management has focused on technical aspects and considered EV-owners as utility maximizers, this study proposes a behavioural model incorporating psychological aspects relevant to EV-owners facing charging decisions and interacting with the supplier. The behavioural model represents utility maximization under myopic loss aversion (MLA) within an ultimatum game (UG) framework where the two players are the EV-owner and the electricity supplier. Experimental economics allowed testing the validity of the behavioural model by designing three experiments where a potential EV-owner faces three decisions (i.e., to postpone EV charging to off-peak periods for a discount proposed by the supplier, the amount of discount to request for off-peak charging at times decided by the supplier, and the amount of discount to accept for supplier-controlled charging) under two contract durations (i.e., short-term, long-term). Findings from the experiments show that indeed potential EV-owners perform charging decisions while being affected by MLA resulting from monetary considerations and the UG participation, and that presenting long-term contracts help potential EV-owners to curtail MLA behaviour and minimise cost even though the assumption of utility maximization is violated. 相似文献
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In congested urban areas, it remains a pressing challenge to reduce unnecessary vehicle circling for parking while at the same time maximize parking space utilization. In observance of new information technologies that have become readily accessible to drivers and parking agencies, we develop a dynamic non-cooperative bi-level model (i.e. Stackelberg leader–follower game) to set parking prices in real-time for effective parking access and space utilization. The model is expected to fit into an integrated parking pricing and management system, where parking reservations and transactions are facilitated by sensing and informatics infrastructures, that ensures the availability of convenient spaces at equilibrium market prices. It is shown with numerical examples that the proposed dynamic parking pricing model has the potential to virtually eliminate vehicle circling for parking, which results in significant reduction in adverse socioeconomic externalities such as traffic congestion and emissions. 相似文献
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Antonio Páez Martin Trépanier Catherine Morency 《Transportation Research Part A: Policy and Practice》2011,45(7):640-652
Smart card automated fare payment systems are being adopted by transit agencies around the world. The data-storage characteristics of smart cards present novel opportunities to enhance transit services. On the one hand, there are fare policies, where smart card holders are given specific rebates on the use of the service based on usage patterns or levels. On the other, there are non-fare policies, for instance if holders receive advantages, such as rebates and offers, from commercial partners. The purpose of this paper is to present a geodemographic framework to identify potential commercial partnerships that could exploit the characteristics of smart cards. The framework is demonstrated using data from Montreal, Canada. Household survey data, specifically trip ends, and business data points are jointly used to determine the exposure of various types of establishments to users of the Montreal Metro network. Spatial analysis of business establishments in the neighborhood of metro stations helps to identify potential commercial partners. The results illustrate the potential of geodemographic analysis to generate intelligence of commercial interest. 相似文献