航运市场运费套期保值方法探讨

分析研究了2种运费套期保值方法远期运价协议和运价指数期货合约，通过典型案例论证了租船人和船东都能利用这2种方法，锁定运费收入或支出，从而规避运价风险的目的；同时对这2种方法进行了分析比较，指出运价指数期货合约具有灵活性且安全的特点，但二者费用有差异，运价指数期货合约需要一定的保证金，实际费用等于经纪人的佣金(通常为0．3％)加上现金保证金的利息。     

电子海图单元索引结构的研究与应用

纸海图的索引在《航海图书总目录》中已经实现,为实现电子海图（ＥＮＣ）单元的索引,需建立一个索引结构,本文根据同种航海用途的电子海图单元之间的邻接关系建立网络图结构,根据不同种航海用途的电子海图单元之间包含与被包含关系建立多叉树结构,将这两种数据结构有机组合的索引结构结合散列查找法不但可实现电子海图单元的索引,也对ＥＣＤＩＳ功能的实时实现提供了有力支持     

浅析城市轨道交通工程造价指标

城市轨道交通工程是一项复杂的系统工程,建设规模大,投资也大.此文选取武汉、苏州等城市已建轨道交通工程初步设计概算指标,从综合造价指标、工程费用指标、工料机价格、前期费用、其他费用、各部分费用所占比例等方面,分析线路敷设方式、车辆类型和编组、土建和系统工程、征地拆迁、车辆购置和贷款利息等对工程造价的影响因素,为合理确定和有效控制工程造价提供思路和参考.     

快速公交系统(BRT)发展水平评价指标体系研究

本文从快速公交系统的设施投入水平、运营服务水平、综合效益水平入手,分别以相应的多项单因素为指标,从不同的方面对快速公交系统的性能和价值作出了描述,并利用层次分析法建立了快速公交发展水平指标体系,为快速公交发展水平的综合评价提供了便利.     

大型航空港设计布局评价指标的探讨

对大型航空港设计布局过程中的评价指标进行探讨,结合资源节约、环境保护、以人为本等可持续发展理念,对现有大型航空港的评价指标进行分析。结果表明,已有的评价指标主要关注容量、安全和成本,这些指标在现有的航空港设计布局中仍然适用,但对环境污染、飞机油耗、旅客效率等因素的考虑有许多欠缺之处。通过分析,针对航空港的陆侧和空侧分别探讨了符合可持续发展规律的大型航空港设计布局评价指标,建议以容量协调、发动机排放、滑行时间、旅客时间等为核心构建评价指标体系。     

指数平滑预测法中平滑系数的确定

提出了确定指数平滑系数的三种方法及有关理论．指出指数平滑系数的正确选择对提高预测精度所起的重要作用．解决了只依靠主观确定的指数平滑系数使指数平滑法在预测中的应用与推广受到限制的问题．     

我国城市轨道交通发展条件指标

针对目前我国城市轨道交通发展条件与实际情况不相适应的状态,提出2个方案:一是从需求、可能性和建设能力3方面对指标进行分析和筛选;二是从需求和可能性的复合性指标进行分析。经比选后推荐方案1作为我国城市轨道交通发展条件的基本指标。在此基础上,综合考虑各方面因素及与现行有关政策的衔接,提出适应我国城市轨道交通健康持续发展的发展条件指标,并对有关问题提出建议。     

Characterizing the fragmentation level of Italian’s National Parks due to transportation infrastructures

In the last decades, due to the population increase and the relative need of new land to cultivate, expand urban centers and develop transportation networks, most of the Italian natural protected areas are subject to different typologies of human pressures that generally cause habitat fragmentation. This process represents a major concern for biodiversity conservation and a key driver of species loss.The main purpose of this paper was to investigate levels of natural habitat fragmentation due to roads and railways networks in the Italian National Parks (INP_S) through the use of an Infrastructural Fragmentation Index (IFI).All the operations (geospatial analysis, image classification, and fragmentation analysis) were performed using a Geographic Information System (GIS) software for elaborating a national database. The obtained results include an IFI value for each natural territorial unit inside any INP. Moreover, in order to highlight which are the INP_S characterized by higher infrastructural fragmentations, an IFI weighted mean was calculated for each INP. These results represent important indicators for the prioritization of biodiversity conservation interventions and the planning of a INP_S sustainable management.     

Extended spectral envelope method for detecting and analyzing traffic oscillations

We propose using a spectral envelope method to analyze traffic oscillations using data collected from multiple sensors. Spectral envelops can reveal not only the salient frequencies of periodic oscillations of traffic flow, but also the relative strength of these oscillations at different locations. This paper first introduces time dimension into the existing spectral envelope method so that it can be applied to study the evolution of vehicular traffic oscillations. The extended spectral envelope method proposed in this paper, or ESPE, discards the normalization procedure in the standard method. A new Contributing Index (CI) is proposed to measure the relative strength of oscillations at different locations. The extended spectral envelops can be constructed on long-term or short-term time scales. While the long-term analysis helps extract salient frequencies of traffic oscillations, the short-term analysis promises to reveal their detailed spatial–temporal profiles. ESPE offers two distinctive advantages. First, it is more robust against the impacts of noises. Second, it is able to uncover complicated oscillatory behaviors which are otherwise difficult to notice. These advantages are demonstrated in case studies constructed on both simulated and real data.