多天线系统中的波束形成原理辨析

针对研究中经常遇到的波束形成技术容易引起混淆这一问题，分析了智能天线和MIMO这两种多天线系统中波束形成的原理，辨析了各自的涵义，阐明了两种波束形成技术之间的区别与联系。     

基于局域网的编组站信息化系统研究

根据实地调研情况研究并提出目前编组站在信息化、自动化方面存在的两个主要问题.基于信息流对编组站进行了由整体到具体的详细系统分析,提出基于企业网的自动化改造方案和系统联网模型,以实现编组站的信息化和自动化深化改革.     

交通发展与旋进原则

论文建议在交通运输发展战略规划中应用一种系统方法论一螺旋推进原则方法论,形成交通旋进战略规划论,阐述其必要性,并指出了相应的主要特点.     

Knowledge based decision support in airport terminal design

The state of the art in airport terminal design has essentially remained unchanged since the 1970s, relying on the use of detailed simulation together with empirical and statistical formulae for sizing the terminal. Air transport has altered considerably since then, with increased use of air travel for both business and leisure, together with the increased use of ‘hub’ terminals in which the terminal acts as an interchange stop on a journey involving several flights. The use of simulation involves a detailed analysis of the terminal design under one set of conditions. To change the design or operating conditions involves a complete resimulation using the new design parameters which is time consuming and computationally expensive.

By using a knowledge based approach, a system can be provided which has the flexibility and speed required to explore the consequences of implementing design decisions in a variety of conditions, together with the ability to use and alter facility sizing methodologies to reflect current and future design guidelines.     

工程施工测量基准及其坐标系统的建立方法探讨

通过引进工程施工测量基准及区域参考椭球等概念，以区域参考椭球与工程施工水准面之间最佳拟合为条件，通过求解坐标转换参数方式，给出了数学上较为严密的完整的计算过程。由此可以解决以往由于采用不同方法建立工程施工坐标系统所引起的概念上的混乱和结果上的不确定性。     

Optimization of mooring systems in the context of an integrated design methodology

This work describes an enhanced mooring optimization procedure, oriented towards recent floating production systems (FPS) for oil & gas exploitation in ultra-deep-water scenarios, which may present a large number of risers in an asymmetric layout. Acknowledging that the risers are the key component of an FPS, the optimization procedure is associated to an integrated mooring-riser design methodology; thus, instead of simply minimizing the platform offsets and/or the costs of the mooring system itself, one of the main objectives is to obtain a mooring configuration that ensures the integrity of the risers. Other highlights of the optimization procedure include the following aspects: Enhancements in the modeling of the optimization problem (including the definition of design variables, objective function and constraints that are relevant for such actual applications); The use of the PSO optimization algorithm associated to the ε-constrained method to efficiently handle the constraints; Enhancements in the evaluation of candidate solutions, by full nonlinear time-domain dynamic Finite Element simulations with coupled models; and the implementation in a parallel computing environment to deal with the high associated computational costs. A case study considering an FPS representative of actual applications in deepwater scenarios is presented to illustrate the practical application of the optimization tool.     

浅谈船舶企业各管理系统之间的信息共享

本文分析了船舶企业中各种相互独立的管理系统之间信息共享的必要性,并从技术和管理方面阐述了如何实现各管理系统之间的整合.     

Modelling and simulation of transportation system effectiveness to reduce traffic congestion: a system dynamics framework

ABSTRACT

This paper is designed to evaluate and improve the effectiveness of transportation systems and reduce traffic congestion through the use of simulation models and scenario development. A system dynamics framework is used to test and evaluate the alternatives of future strategies for the city of Surabaya, Indonesia. Some factors affecting the effectiveness of transport systems include operational effectiveness and service effectiveness, as well as uncertainty. To improve the effectiveness of transportation systems, several strategies can be implemented, such as subsidizing public transportation, increasing the cost of private vehicle parking fees, raising taxes on private vehicles, and reducing delays in public transportation through scenario development. Scenario results show that, by pursuing these strategies, effectiveness could be improved by 80% as the impact of the increase in operational and service effectiveness, helping to mitigate traffic congestion. Congestion could be reduced to 70% (on average) due to the decrease in daily traffic.     

“This train is without a destination”: a cost benefit analysis of the retention of railway services — the Penistone line

The paper undertakes a cost‐benefit analysis of a disinvestment using readily available data and demonstrates that a relatively straightforward yet systematic approach can provide useful input to the decision‐making process. Despite various assumptions necessitated by the analysis, it is argued that the net benefits of the railway line retention are unlikely to be significantly sensitive to their variation within feasible limits. The most significant component in the analysis is seen to be the operative costing system and it is argued that this should be revised.     

Estimating the Economic Benefits of Regional Ocean Observing Systems

This article introduces a theme issue of the Coastal Management Journal comprising a set of articles on the potential economic benefits from new investments in coastal ocean observing systems. We describe a methodology to estimate these benefits, and apply this methodology to generate preliminary estimates of such benefits. The approach focuses on coastal ocean observing information within ten geographic regions encompassing all coastal waters of the United States, and within a wide range of industrial and recreational activities including recreational fishing and boating, beach recreation, maritime transportation, search and rescue operations, spill response, marine hazards prediction, offshore energy, power generation, and commercial fishing. Our findings suggest that annual benefits to users are likely to run in the multiple $100s of millions of dollars. The project results should be considered first-order estimates that are subject to considerable refinement as the parameters of regional observing systems are better defined, and as our understanding of user sectors improves.