基于Web的继电保护管理信息系统的UML设计

针对基于Web的继电保护管理信息系统的功能特点和开发难点,用UML实现了Web的继电保护管理信息系统的建模,为系统软件的开发奠定了基础.     

水运工程信息模型体系研究及应用

信息模型体系是水运工程BIM技术研究及应用中的重要组成部分。为解决水运工程信息模型全生命期应用过程中出现的模型层级混乱、难以管理等问题,结合水运工程行业的特点,对水运工程信息模型体系进行了分析研究。提出分层构建水运工程信息模型体系的思路和具体方法,最后以实际项目应用为依托,对分层构建模型体系的方法进行验证。结果表明:分层构建模型体系的方法使模型层级结构清晰明了,便于信息模型的规范化管理及应用。     

Hinge joint damage identification method of soft yoke mooring system based on multibody dynamic modeling and structural monitoring data

Soft yoke mooring system (SYMs) is a single-point mooring system used in shallow water oil and gas development. In general, SYMs consists of mooring framework support, mooring legs, yoke, and single-point turret and it forms a multibody dynamic system with 13 hinge joint structures such as universal joints and thrust bearings. The hinge joint is one of the key components of SYMs; therefore, it is necessary to accurately evaluate the operating behavior of the hinge joints. In this study, real-time damage identification is conducted based on the multibody dynamic features of the SYMs. First, a long-term monitoring strategy for the prototype application is developed based on the multibody governing equations of the SYMs. The motion behaviors and stress state of the hinge joints and bodies are calculated using prototype monitoring data. A hinge joint damage identification based on the virtual moment is proposed by considering the changes in the friction coefficient in the damage state. The virtual moment method is used to transform the damage identification problem of the SYMs into a problem of seeking the optimal solution to the dynamics identification function. Genetic algorithm (GA) is implemented to seek the optimal solution of the friction coefficient of each hinge joint. A large-scale model testing system of the SYMs is established to perform the damage identification of the bottom hinge joints of the SYMs. The results show that the proposed method can effectively identify the damage degree and position of the hinge joints of the SYMs and provide a real-time warning system for the in-service operation of the SYMs.     

船用海水泵组可靠性及维修性分析

在系统的设计过程中,可靠性设计是及时发现和排除设计中薄弱环节的关键,维修性设计是实现及时、高效地维修要求的核心。文章对某船用海水泵组的可靠性和维修性设计进行了详细分析,通过建模、分配、预计,最终确认了各部套件满足其可靠性和维修性的要求,为同类型选型设备的可靠性和维修性设计提供了依据。     

Data-driven linear decision rule approach for distributionally robust optimization of on-line signal control

We propose a two-stage, on-line signal control strategy for dynamic networks using a linear decision rule (LDR) approach and a distributionally robust optimization (DRO) technique. The first (off-line) stage formulates a LDR that maps real-time traffic data to optimal signal control policies. A DRO problem is solved to optimize the on-line performance of the LDR in the presence of uncertainties associated with the observed traffic states and ambiguity in their underlying distribution functions. We employ a data-driven calibration of the uncertainty set, which takes into account historical traffic data. The second (on-line) stage implements a very efficient linear decision rule whose performance is guaranteed by the off-line computation. We test the proposed signal control procedure in a simulation environment that is informed by actual traffic data obtained in Glasgow, and demonstrate its full potential in on-line operation and deployability on realistic networks, as well as its effectiveness in improving traffic.     

重庆港集装箱码头三维模拟系统设计

以重庆港集装箱码头为实例,利用虚拟现实的方法和技术,混合使用Auto CAD、3D s MAX、Photoshop、Prem iere的技术集成,开发出了集装箱码头的三维可视化仿真系统。介绍了系统的设计方法,系统的构成和工作流程,并对系统中用到的关键技术进行了分析研究,系统虚拟的动画模拟可以为集装箱码头的运营管理提供决策依据。     

A model to assess public transport demand stability

Transport authorities, especially those in developing countries where rising income stimulate increased car ownership rates, are often concerned with maintaining or increasing levels of public transport use. Therefore, the ability to identify clients at risk of abandoning the system can be valuable for remedial measures, allowing for more focused quality improvements. We present and apply a model that determines the probability of migrating from public to private transport at both aggregated and disaggregated levels. In application, the model predicted migration with 60% accuracy in the first preference recovery measure. The proposed model can improve the understanding of the behavior of public transport users, the analysis of demand stability and the factors influencing migration. This, in turn, can help to focus policy and management measures and increase the efficiency of public investment.     

Providing personalized system optimum traveler information in a congested traffic network with mixed users

The advancement of information and communication technology allows the use of more sophisticated information provision strategies for real-time traffic management in a congested network. This article proposes a personalized system optimum traveler information (PSOI) system under ubiquitous communication, which allows traffic system operators to fully optimize and coordinate individuals' trip plans according to the personal attributes, such as real-time location, value of time, allowable budgets for congestion tolling, and willingness to take detours. We also developed an efficient queue-based evaluation and solution heuristic algorithm using mesoscopic simulation models to solve for near-optimal PSOI strategies—route suggestions for each individual traveler. The simulation optimization algorithm can account for different information users and provide predictive information that robustly accounts for potential decisions of other travelers in real time. Case studies were carried out on a test network and a real-world network, and the proposed heuristic algorithm is proven effective. Also, sensitivity analyses show that PSOI not only is an effective traffic management method in reducing average system travel time, but also potentially provides travelers with reasonable or even shorter travel times compared with other information users. Further, simulation results showed that even in mixed traffic, PSOI is able to shorten travel times for both users without information and users of other information types. Thus, PSOI is recommended by this article as an advantageous way for next-generation advanced information systems and dynamic traffic management.     

管线三维建模及可视化分析

管线是主要的城市基础设施之一，管线三维建模与可视化是构建“数字城市”的重要内容。采用断面与体面三角剖分拟合方法构建弯曲管线、三连通管线的三维模型，给出建模的方法和步骤，以OpenGL作为三维图形应用程序接口，实现管线三维建模及可视化。     

外语教学中培养学生的创新意识

创新是人类文明进步的基本条件。在新科技革命和知识经济迅速崛起的今天,创新意识和创新能力已经成为经济和社会发展的决定性因素,备受关注。外语教学旨在培养学生运用外语进行交际的能力,而交际的核心是语言运用的创造性,因此,在外语教学中注重培养学生的创新意识是适应社会发展的需要。