我国遥感应用现状及对海事发展的启示

文中从主要应用领域和相关职能机构的角度,综述了遥感技术在我国的应用现状。并结合目前遥感技术在海事领域的应用现状,通过行业对比,重量探讨了相关行业遥感应用进展对我国海事及海事遥感发展的启示,并提出了几点建议。     

三次样条曲线等外力端概念及其处理方法

常用的三次样条曲线几种端值条件如简支端、抛物端已不能完全满足曲线光顺的要求。本文从样条曲线精密光顺准则出发,提出一个新的端值条件——等外力端的概念、分类和处理方法。同时从能量最小原理出发,用变分的方法推导出几种端值条件,说明它们的力学背景。在本文中,还提出了连续梁的初始剪力定理。 作者把等外力端应用于样条曲线精密光顺试验,效果十分满意。     

TRESIS: A transportation,land use and environmental strategy impact simulator for urban areas

The Institute of Transport Studies has developed a Transportation and Environment Strategy Impact Simulator (TRESIS) as a decision support system to assist planners to predict the impact of transport strategies and to make recommendations based on those predictions. A key focus of the simulator is the richness of policy instruments such as new public transport, new toll roads, congestion pricing, gas guzzler taxes, changing residential densities, introducing designated bus lanes, implementing fare changes, altering parking policy, introducing more flexible work practices, and the introduction of more fuel efficient vehicles. The appropriateness of mixtures of policy instruments is gauged in terms of a series of performance indicators such as impacts on greenhouse gas emissions, accessibility, equity, air quality and household consumer surplus. In this paper we introduce TRESIS to the research community, focussing on the structure of the system and the diversity of applications. Applications are presented to illustrate the diversity and richness of TRESIS as a policy advisory tool.     

自动化技术在汽车机械制造中的创新应用研究

信息化科学技术不断更新迭代,自动化技术作为新时代科学发展的新兴产业技术,在汽车机械制造中发挥着至关重要的作用,同时,亦是汽车产业结构转型升级的关键所在,亦是衡量评价社会经济高质量发展水平的重要价值评判依据。因此,在实践生产进程中汽车制造企业应根据自身发展特点及实际现状融入自动化"创新技术",因此,如何构筑系统的自动化汽车机械制造技术体系是当前所研究的重点。鉴于此,通过阐述自动化技术基本概念及优势分析基础上,从自主化应用、智能化应用及集成化应用三方面入手,最终形成了"创新应用-融合发展"产业结构体系。     

直接序列扩频通信及其军事应用研究

直接序列扩频技术在军事通信中得到了广泛的应用。文章介绍了直接序列扩频通信的原理及其优点,针对不同的干扰方式,对直接序列扩频通信的抗干扰能力进行分析。根据目前直接序列扩频通信的军用情况,研究了直接序列扩频通信电台的战术应用,对提高其战斗效能具有重要意义。     

高真空压铸铝合金车身应用部位推荐研究

文章主要针对高真空压铸铝合金特点进行总结分析,并且根据国外近十年ECB车型应用位置进行统计分析,归纳出高真空压铸铝合金常用位置及应用频次,针对典型车型进行应用说明,结合国内主流趋势,给予国内车身高真空压铸铝合金应用部位推荐,满足高真空压铸和汽车零部件轻量化需求。     

智能运输系统哲学层次上的思考

智能运输系统是当前国内外交通运输科技的热点,本文从系统的角度探讨了智能运输 系统的实质以及与交通工程的区别,还试图从哲学的角度对智能运输系统的发展进行描述,讨 论了智能运输系统与信息系统、管理系统、人的行为的关系.     

基于GSM-R的通信模组管理平台的设计与研究

GSM-R通信模组是铁路物联网的重要信息传输工具,通信模组能够使得布设在铁路沿线的传感器具备网络接入能力,同时能够保证通信过程的安全可靠,进而保障高速铁路运行的安全稳定和高效运转.设计一种基于GSM-R的通信模组管理平台,用于实现对GSM-R通信模组的安全接入、行为管控、业务分析以及服务分析,辅助铁路上传感器间信息的安...     

Using intelligent agents for Transportation Regulation Support System design

This paper presents an agent-based approach used to design a Transportation Regulation Support System (TRSS), that reports the network activity in real-time and thus assists the bus network regulators. The objective is to combine the functionalities of the existing information system with the functionalities of a decision support system in order to propose a generic model of a traffic regulation support system. Unlike the other approaches that only deal with a specific task, the original feature of our generic model is that it proposes a global approach to the regulation function under normal conditions (network monitoring, dynamic timetable management) and under disrupted conditions (disturbance assessment and action planning of feasible solutions). Following the introduction, the second section presents the notions of the domain and highlights the main regulation problems. The third section details and motivates our choice of the components of the generic model. Based on our generic model, in the fourth section, we present a TRSS prototype called SATIR (Système Automatique de Traitement des Incidents en Réseau – Automatic System for Network Incident Processing) that we have developed. SATIR has been tested on the Brussels transportation network (STIB). The results are presented in the fifth section. Lastly, we show how using the multi-agent paradigm opens perspectives regarding the development of new functionalities to improve the management of a bus network.     

Identification of vehicle sensor locations for link-based network traffic applications

Information on link flows in a vehicular traffic network is critical for developing long-term planning and/or short-term operational management strategies. In the literature, most studies to develop such strategies typically assume the availability of measured link traffic information on all network links, either through manual survey or advanced traffic sensor technologies. In practical applications, the assumption of installed sensors on all links is generally unrealistic due to budgetary constraints. It motivates the need to estimate flows on all links of a traffic network based on the measurement of link flows on a subset of links with suitably equipped sensors. This study, addressed from a budgetary planning perspective, seeks to identify the smallest subset of links in a network on which to locate sensors that enables the accurate estimation of traffic flows on all links of the network under steady-state conditions. Here, steady-state implies that the path flows are static. A “basis link” method is proposed to determine the locations of vehicle sensors, by using the link-path incidence matrix to express the network structure and then identifying its “basis” in a matrix algebra context. The theoretical background and mathematical properties of the proposed method are elaborated. The approach is useful for deploying long-term planning and link-based applications in traffic networks.