基于SDH的MSTP中的数据交换芯片设计

针对在SDH上构建多业务传输平台(MSTP)的需求,介绍了一种能在SDH传输和接入设备中提供灵活的数据业务支持的PoS(PacketoverSDH)数据交换芯片的设计方法。该芯片基于共享存储器的交换结构,采用了先进的流水线设计方式以提高整体交换容量。芯片支持服务质量保证(QoS)和组播(Multicast)功能,可用于SDH传输和接入设备中,为SDH上的数据业务支持提供简单而高效的解决方案。     

Spatial welfare economics versus ecological footprint: modeling agglomeration,externalities and trade

A welfare framework for the analysis of the spatial dimensions of sustainability is developed. It covers agglomeration effects, interregional trade, negative environmental externalities, and various land use categories. The model is used to compare rankings of spatial configurations according to evaluations based on social welfare and ecological footprint indicators. Five spatial configurations are considered for this purpose. The exercise is operationalized with the help of a two-region model of the economy, that is, in line with the ‘new economic geography.’ By generating a number of numerical ‘counter-examples,’ it is shown that the footprint method is inconsistent with an approach aimed at maximum social welfare. Unless environmental externalities are such a large problem that they overwhelm all other components of economic well-being, a ‘spatial welfare economic’ approach delivers totally different rankings of alternative land use configurations than the ecological footprint.      

Estimating Krugman’s Economic Geography Model for the Spanish Regions

This paper estimates Krugman’s (J Polit Econ 99:413–499, 1991) economic geography model using data from the Spanish NUTS 3 regions. The econometric formalization endogenously determines wages in a region as a function of income and wages in other regions. The specification adopted also allows us to study the relation between the agglomeration of economic activity, increasing returns and market access. The first result obtained is that the Spanish economy exhibits a spatial wage structure: wages in a region are positively determined by income and wages in neighboring regions. In second place it is found support for the structural relations of the underlying theoretical model, indicating the importance of scale economies and transport costs in shaping the Spanish economic geography.     

Participation index: a measure to identify rural transport disadvantage?

This paper develops a composite participation index (PI) to identify patterns of transport disadvantage in space and time. It is operationalised using 157 weekly activity-travel diaries data collected from three case study areas in rural Northern Ireland. A review of activity space and travel behaviour research found that six dimensional indicators of activity spaces were typically used including the number of unique locations visited, distance travelled, area of activity spaces, frequency of activity participation, types of activity participated in, and duration of participation in order to identify transport disadvantage. A combined measure using six individual indices were developed based on the six dimensional indicators of activity spaces, by taking into account the relativity of the measures for weekdays, weekends, and for a week. Factor analyses were conducted to derive weights of these indices to form the PI measure. Multivariate analysis using general linear models of the different indicators/indices identified new patterns of transport disadvantage. The research found that: indicator based measures and index based measures are complement each other; interactions between different factors generated new patterns of transport disadvantage; and that these patterns vary in space and time. The analysis also indicates that the transport needs of different disadvantaged groups are varied.     

基于快铁融合的上海铁路集装箱快运站选址研究

快铁融合可以充分发挥快递企业和铁路运输的优势,有效提升物流作业效率,达到运输资源分配平衡的效果,是多元化运输的发展方向。在既有和计划建设的铁路货运站中选择铁路集装箱快运站与快递企业集散网络衔接,以快递企业时间满意度和集散运输成本为目标,构建基于时间满意度的铁路集装箱快运站选址模型,以上海铁路集装箱快运站为例进行实证分析,提出保证铁路集装箱快运站与快递企业合理衔接的对策,为铁路集装箱运输融入快递市场提供决策支持,加速快铁融合的实施。     

Encouraging behavioural change towards sustainable tourism: a German approach to free public transport for tourists

Constantly growing transport demand by tourists within holiday destinations and related increases in CO₂ emissions have helped foster a new trend amongst German destinations towards promoting a green transportation mode for vacationers. A key innovation is the “Gästeticket” or Guest Ticket concept, which offers tourists free public transport, on buses and trains, within defined destination areas throughout their stay. This paper describes the background to this concept, and the many different ways in which it has been created, designed, implemented and administered. A qualitative research methodology interviewed key public and private sector stakeholders, including local and regional politicians, accommodation providers, public transport providers and public transport authorities to identify favourable starting conditions, successful financial and institutional implementation strategies, and both supporters and opponents of guest tickets. Local politicians and many small accommodation providers opposed the concept, while regional and national politicians supported it, as did public transport providers and public transport authorities. The concept is compared to the more holistic Alpine Pearls concept founded in Austria, and the case made for better explanation of the Guest Ticket concept to its opponents, better marketing, further research and closer cooperation between transport providers and planners with tourism attractions and accommodation providers.     

Transport impacts of government employment decentralization in an Australian city – Testing scenarios using transport simulation

Australia's largest cities are more mono-centric than most US cities and may be over-centralising, particularly in terms of office employment. Government worker relocation programs are being employed with policy debate over what should be an ideal urban structure including in terms of travel behaviour. The paper explores research approaches to explore transport impacts of employment decentralization. A review shows the results of: surveys of workers moved to suburban locations; longitudinal analyses of transport and land use changes in city-regions using cross-sectional census or HTS data; comparative analysis of urban structure variables across cities using similar datasets; combinations of longitudinal and comparative research; and, scenario-based modelling approaches. A modelling framework is then developed to appraise the possible transport impacts of decentralization in Brisbane. To test the possibilities further, two decentralization scenarios modelled and compared. Decentralization mostly to middle-suburban locations better addresses jobs-housing balance and maximises proposed new public transport services, producing good transport outcomes. However, decentralization to outer-suburban locations in Brisbane exacerbates the propensity for decentralization to increase travel distances, especially by car.     

城市旅游集散中心发展战略探讨——基于服务创新四维度的分析

旅游集散中心在城市旅游发展中居于重要地位,而服务创新是集散中心发展的基本方向。通过借鉴服务创新四维度模型,从概念创新、游客界面、服务传递系统和技术创新等方面探讨了旅游集散中心服务创新的内容和方向,为优化集散中心和城市旅游的互动关系提供参考。     

运输成本、劳动力流动与制造业区域分布

近年来,中国制造业的区域发展不平衡,其中的重要影响因素是什么?本文通过构建经济地理的分析框架,分析了运输成本和劳动力流动在中国特有条件下的作用机制。运输成本差异形成了制造业在沿海地区的选址优势,而这一优势和目前的高劳动力流动成本一起,形成了沿海高成本压力而内地收入低下的新空间“二元”结构。同时,我们计算了区域经济的实际数据对这一机制进行印证,假如这一局面继续维持,它将妨碍沿海和内地产业分工与均衡发展。文章还认为,因为经济集中的趋势是内生的,所以平衡区域经济发展的政策取向应该是促进性而不是限制性的。     

Transport development and the evolution of economic geography

In this paper, based on the recent advances in the new economic geography (e.g., Fujita et al. [12]), we analyze impacts of transport costs on the spatial patterns of economic agglomeration. We first identify prototypes from the existing models, and explain the mechanism of how transport costs influence the balance between economic forces of agglomeration and dispersion. We then investigate the transformation of the agglomeration/dispersion patterns given gradually decreasing transport costs for different goods.Received: Received: July 2004 / Accepted: January 2005, Accepted: Received: July 2004 / Accepted: January 2005, JEL Classification: R12Tomoya Mori: Correspondence toThe authors are grateful to David Bernstein, Tatsuo Hatta, Komei Sasaki, Tony E. Smith, and two anonymous referees for their valuable comments. This research is partly supported by The Grant in Aid for Research 08403001 of Ministry of Education, Science and Culture in Japan, the Murata Science Foundation, and WESCO Civil Engineering Technology Foundation.