Reliable emergency service facility location under facility disruption,en-route congestion and in-facility queuing

The planning of emergency service facility location, especially for those expecting high demand and severe conditions, requires consideration of victims’ en-route travel, in-facility service quality, and reliability of these service facilities themselves. This paper first presents a scenario-based stochastic mixed-integer non-linear program (MINLP) model that integrates facility disruption risks, en-route traffic congestion and in-facility queuing delay into an integrated facility location problem. We derive lower and upper bounds to this highly complex problem by approximating the expected total system costs across the normal and all probabilistic facility disruption scenarios. This allows us to develop a more tractable approximate MINLP formulation and a Lagrangian Relaxation (LR) based solution approach. The relaxed sub-problem for location and service allocation decisions is further reformulated into a second-order conic program. Numerical experiments show that the approximate model and LR solution approach are capable of overcoming the computational difficulties associated with the problem. Interesting findings and managerial insights are obtained from a series of sensitivity analyses, e.g., regarding the importance of considering in-facility queuing in location design, and the significance of resource pooling on the optimal facility deployment.     

和谐型机车车轮车轴综合探伤技术体系的研究

论述建立和谐型大功率机车车轮车轴综合探伤体系的必要性,分析和谐型大功率机车轮对探伤要求,研究和谐型大功率机车轮对缺陷综合检测体系技术,提出了在日常动态检测、定期在线检测和定期落轮检测三个层次上建立和谐机车轮对综合检测体系,以保障机车走行部运行安全.     

An inspector calls: farm accommodation providers' attitudes to quality assurance schemes in the county of Devon

Estimates suggest that 10 000 farms in the UK offer bed and breakfast (B and B) serviced accommodation. A thorough review of the existing literature indicates over 50% of Devon and Cornwall's farmhouse B and B sector operate without participating in any form of quality assurance inspection scheme. This research executes a stratified postal survey to gain a comprehensive understanding of Devon's farmhouse B and B product, with particular interest in extracting providers' attitudes towards quality assurance inspection schemes. The very representative results suggest a divergence of attitudes towards the notion of quality inspections for all farmhouse B and B providers. Copyright © 2002 John Wiley & Sons, Ltd.     

Airline frequent flyer programs: equity and attractiveness

The scheme of a frequent flyer program describes how travelers accumulate and redeem their frequent flyer miles in the program, and determines the amount of benefits travelers can receive from the program (e.g., number of free trips). In the US, there are three basic types of frequent flyer program schemes (standard, discount, and non-mileage schemes). This paper investigates, by type of traveler, which scheme is most (or least) attractive to customers, so that each airline can select the most appropriate (or attractive) scheme for its target audience. The study results imply that the “non-mileage” scheme may be most attractive to travelers with low average trip miles (flown miles per trip), while the “standard” scheme may be most attractive to travelers with high average trip miles.     

铁路客运检修基地合理布局的研究

针对我国铁路线路分布广阔,以及检修基地投资巨大,通过定性和定量相结合的方式,分析了检修基地设置的合理数量,建立以全路客车车辆进出检修基地的总的走行距离最短为目标的规划模型,得出不同方案的定量结果,并对各方案进行简要的分析。     

Determinants hindering the intention of tourists to visit disaster-hit destinations

The purpose of this study is to propose and examine a new research model that is able to capture both the cognitive and affective components influencing potential tourists' behavioural intentions to visit a disaster-hit destination, which have negatively affected their perceived destination image. A survey of 357 participants provides strong support for the model. The results indicate that participants' perceptions of destination image are a strong predictor of their travel intentions. Factors relating to cognitive appraisals (e.g. perceived equipment risk, perceived natural risk and perceived social risk) as well as affective evaluations (e.g. perceived fear of ghosts, perceived unpleasantness, etc.) were found to be critical components that significantly, and negatively, influence potential tourists' perceptions of a destination image. Theoretical and practical implications of the results are discussed herein.     

Accessibility improvement,territorial cohesion and spillovers: a multidimensional evaluation of two motorway sections in Poland

The aim of this paper is to contribute to previous methodological studies of the approach to potential accessibility used in the evaluation of development of the road network. This is done by making a threefold analysis, which combines the overall improvement in the level of accessibility, territorial cohesion, and spatial spillovers. Moreover, we use different spatial dimensions (namely national and international) and different distance decay parameters to estimate both the short trips (e.g. commuting) and the long trips (e.g. business trips or tourism). The results are presented at a very detailed spatial scale (i.e. municipalities – LAU-2 units).The paper provides empirical evidence of improvement in accessibility, changes in the degree of territorial cohesion, and spatial spillovers resulting from the recent completion of two sections of motorway in Poland. The selected case studies differ according to their location (i.e. national and European, peripheral vs. central location), population density, and the settlement structure around the investment.The validity of the proposed multidimensional approach to the evaluation of road investments is verified as the combination of different accessibility dimensions and leads to results which differ respecting efficiency, equity and spillover effects. This paper provides arguments to strengthen the need for the tailor-made parameters of potential accessibility indicator and spatial dimension of analysis. They should be adjusted to the main aim of the particular evaluation.     

Promoting active mobility behavior by addressing information target groups: The case of Austria

Current transport policy objectives aiming to increase active mobility can solely be achieved by changing people's mobility behavior. To arouse interest and influence the decision process of the people, adequate information sources and services as well as appropriate incentives and motivation have to be used, but they have to be target-group specific to reach people more effectively. Influencing factors such as mobility habits, attitudes towards transport modes, shared social norms and values must be considered. Since people resemble in some characteristics, methods from social sciences are applied to identify homogeneous groups of shared mobility-related information needs and to extract appropriate group-related arguments to promote active mobility (e.g. health, environment, costs, image, or adventure). The paper describes the methodological approach and the results in form of six comprehensively defined homogeneous target groups derived from 12 qualitative focus groups. Moreover, a survey among a representative sample of 1000 persons in Austria is presented. Based on the outcomes, customized concepts for each specific target group (arguments, information needs, and preferred information channels) have been developed. The concept provides a solid basis for implementing measures to promote active mobility as prerequisite for reaching transport policy objectives.     

着眼治理安全质量隐患提升铁路客站建设项目管理水平

为全面提高铁路客站建设管理质量和水平,近期铁路展开在建高铁车站质量安全督导和检查。回顾近几年铁路客站建设取得的成就,针对在建高铁客站质量安全督导和检查的情况,分析当前铁路客站建设在安全质量工作方面亟待解决的问题,结合铁路客站建设项目管理切身体会,提出提升客站建设项目管理水平的针对性建议。     

Human resource development issues for the hotel sector in Libya: a government perspective

The Libyan government emphasises the importance of tourism in economic diversification through its Libyan Tourism Master Plan identifying various initiatives to develop the Libyan tourism industry, including human resource development (HRD). Hotels are key to an internationally competitive industry and human resources critical to perceptions of service quality. This paper analyses issues relating to the Libyan hotel sector, including the need to strengthen the private sector; to match education/training programmes to industrial needs, and to address cultural and religious dimensions which exacerbate poor industry image. The paper identifies a partnership approach between governmental, educational and hotel sectors to address HRD issues through workforce planning. Copyright © 2008 John Wiley & Sons, Ltd.     

设置动车运用所的客运站动车组走行线布置分析

车站与动车运用所的关系有多种可能，其布置形式都要遵循动车组列车运行的客观规律。以动车运用所为例，分析动车组走行线与车站布置的关系，以及机车牵引的列车与动车组列车在始发终到客运站的作业区别，并给出只衔接1条客运专线的始发终到客运站动车组走行线、和衔接多条客运专线的始发终到客运站动车组走行线的布置形式。指出只有弄清高速铁路运行规律，才能做好动车组走行线的布置。     

铁路机车检修修制改革方案探讨

武威南机务段为解决运输任务增长与机车配属不足的矛盾,推行了机车检修修制改革。新修制改为一、二级检修及小修三级修程,并对其执行情况及所取得的成绩作了介绍,最后指出新修制尚存在的问题及其进一步的发展方向。     

Near “real-time” estimation of excess commuting from open-source data: Evidence from China's megacities

Urban commuting has continuously fascinated scholars and decision-makers. As few people live and work in the same place, there is always excess commuting (i.e., the non-optimal or surplus work travel occurring in cities because people do not minimize their journeys to work for most residents). Traditional commuting data sources (e.g., questionnaires and census surveys) are challenged by small samples, high cost, and low spatiotemporal resolution. In contrast, the big social-sensing data (e.g., smart card and mobile phone data) only consider one or two traffic mode of a route, which is not consistent with the real-life condition. This article proposes a framework for modeling excess commuting based on open-source data of the ten most populous megacities in China. We downloaded residential points of interest (POIs) from Lianjia Real Estate website and obtained workplace POIs from China's AMAP, which is widespread used as Google map. The stratified sampling approach was employed to derive commuting pairs. Both commuting distance and time were obtained by the shortest path under public transportation from AMAP. Then, the linear programming method was employed to calculate the theoretical minimum commuting time and distance of each city. We analyzed the statistical property and spatial distributions of excess commuting and found that (1) commuting distances and time (ranging from 9.1 to18.1 km and from 44.8 to 74.3  minutes) of all ten megacities follow a left-skewed normal distribution; (2) in terms of commute cost, all cities show universal core-periphery patterns where the spatial heterogeneity of the commuting time is more significant than that of distance; (3) for each city, the excess commuting measured by time (i.e. from 0.61 to 0.79) is lower than that measured by distance (i.e. 0.68 to 0.89); and (4) the role of mixing land use, waterbody distribution, and centripetal urbanization on urban commuting distance and time is significant.     

Residential dissonance and mode choice

Residential dissonance refers to the mismatch in land-use patterns between individuals’ preferred residential neighbourhood type and the type of neighbourhood in which they currently reside. Current knowledge regarding the impact of residential dissonance is limited to short-term travel behaviours in urban vs. suburban, and rural vs. urban areas. Although the prevailing view is that dissonants adjust their orientation and lifestyle around their surrounding land use over time, empirical evidence is lacking to support this proposition. This research identifies both short-term mode choice behaviour and medium-term mode shift behaviour of dissonants in transit oriented development (TODs) vs. non-TOD areas in Brisbane, Australia. Natural groupings of neighbourhood profiles (e.g. residential density, land use diversity, intersection density, cul-de-sac density, and public transport accessibility levels) of 3957 individuals were identified as living either in a TOD (510 individuals) or non-TOD (3447 individuals) areas in Brisbane using the TwoStep cluster analysis technique. Levels of dissonance were measured based on a factor analysis of 16 items representing the travel attitudes/preferences of individuals. Two multinomial logistic (MNL) regression models were estimated to understand mode choice behaviour of (1) TOD dissonants, and (2) non-TOD dissonants in 2009, controlling for socio-demographics and environmental characteristics. Two additional MNL regression models were estimated to investigate mode shift behaviour of (3) TOD dissonants, and (4) non-TOD dissonants between 2009 and 2011, also controlling for socio-demographic, changes in socio-demographic, and built environmental factors. The findings suggest that travel preference is relatively more influential in transport mode choice decisions compared with built environment features. Little behavioural evidence was found to support the adjustment of a dissonant orientation toward a particular land use feature and mode accessibility they represent (e.g. a modal shift to greater use of the car for non-TOD dissonants). TOD policies should focus on reducing the level of dissonance in TODs in order to enhance transit ridership.     

金属屋面板系统承载力的实验检测方法

金属屋面板广泛应用于大型公共建筑以及工业建筑中,国内现行规范、规程针对金属屋面板系统的承载力未做详细规定,研究金属屋面板系统在各种工况下的承载力具有重要意义。提出金属屋面板系统承载力的实验检测方法,包括试件制作、加载制度、测点布置、试验现象描述以及数据分析等。通过足尺实验实例介绍实验研究的实施步骤,实验方法可供各类建筑金属屋面板承载力的检测参考。     

An approach to imputing destination activities for inclusion in measures of bicycle accessibility

This paper proposes a new method to estimate bicycle accessibility for various trip purposes based on a massive dockless bike-sharing dataset in Shanghai, China. Specifically, a Dirichlet multinomial regression topic model (DMR model) is applied to identify bicycle trajectories' trip purposes, simultaneously considering arrival time and drop-off location. Based on obtained trip purposes, we estimate impedance functions using a negative exponential function. Finally, based on estimated impedance functions, two cases of bicycle accessibility for two different purposes - restaurant and hospital - are presented in Shanghais central area. The results show that almost 90% of bicycle trips are less than 30 min or 5 km. Although the difference between the impedance functions between various trip purposes is not significant, we find that trip purposes of “Work and School” have the highest travel impedance for bicyclists. Cyclists in Shanghai accept longer bicycle travel times for leisure (e.g., shopping) than for commuting (e.g., work or school).     

Exploring causality in trade and air passenger travel relationships: the case of Asia-Pacific, 1980–2010

This paper explores the potential of heterogeneous Granger analysis in transport geography research by applying this method to a specific case of the often complex and potentially reciprocal linkages between the deployment of transport infrastructures and spatial economic development: the linkages between rising intra-regional volumes of trade and air passenger traffic in Asia-Pacific. Although conceptual and empirical linkages between both indicators can be assumed based on previous research, relatively little is known about the actual causality. Using heterogeneous Time Series Cross Section Granger causality analysis for the period 1980–2010, we explore the presence of four ‘causality scenarios’ amongst different country-pairs: (1) there is no co-evolution, implying that both patterns develop independently (e.g. Japan–Australia); (2) there is ‘real’ co-evolution in that both patterns influence each other through feedback loops (e.g. South Korea–Philippines); (3) air passenger traffic is facilitated by trade (e.g., South Korea–Philippines); or (4) trade is facilitated by air passenger traffic (e.g. Australia–Malaysia). Some tentative interpretations of this heterogeneity are offered.     

A multiple dispatch and partial backup hypercube queuing model to analyze emergency medical systems on highways

The hypercube is a spatially distributed queuing model based on Markovian analysis approximations, used to analyze the configuration and operation of server-to-customer emergency systems. In the present study we adapted the model to analyze emergency medical systems (EMS) on highways, which operate within particular dispatching policies. The study takes into consideration that: the emergency calls are of different types; the servers are distinct (e.g., rescue ambulances, medical vehicles); only certain servers in the system can service calls in a given region (partial backup); and, depending on the type of call, one or more identical or distinct servers are immediately dispatched to service such calls (multiple dispatch). We also consider that the arriving calls take place either along the highway or at the home location of a server – in which case the server does not need to travel to the call location. Finally, we analyzed the computational results of applying such an approach to the case study of an EMS operating on Brazilian highways.     

Study of the topology and robustness of airline route networks from the complex network approach: a survey and research agenda

Communication via air routes is an important issue in a world organized around a web city network. In this context, the robustness of network infrastructures, e.g. air transport networks, are a central issue in transport geography. Disruption of communication links by intentional causes (e.g., terrorist attack on an airport) or unintentional (e.g., weather inclemency) could be crucial for countries, regions and even the airlines affected themselves. Policymakers and the management of airlines and alliances should be able to reduce the effects of such interruptions in order to ensure good communication through air transport (i.e., maximize the robustness of their network at a reasonable cost). The literature review of the study of air transport route networks through an analysis of complex networks has highlighted a lack of contributions to the study of the topology and the robustness of such networks which contrasts, with advances undertaken for other transport networks or communication systems. This survey suggests areas in which research should be undertaken, based on the existing literature in other areas and from three different perspectives: global route networks, airline alliances, airlines and airports so as to help towards a better understanding of air traffic and, therefore, to be able to assess the potential damage of any airport being inoperative for a continent, country or airline.     

Passenger perceptions and the ideal urban bus journey experience

Respondents living close to a Quality Bus Corridor indicated which of 68 items were ‘Things I dislike or things that discourage me from using the bus in Edinburgh’. Eight underlying factors are reported: feeling unsafe (e.g., ‘Drunk people put me off travelling by bus at night’); preference for walking or cycling (e.g., ‘I prefer to walk’); problems with service provision (e.g., ‘No direct route’); unwanted arousal (e.g., ‘The buses are too crowded’); preference for car use (e.g., ‘I feel more in control when I drive’); cost (e.g., ‘The fares are too expensive’); disability and discomfort (e.g., ‘There are not enough hand rails inside the bus’); and self-image (e.g., ‘Travelling by bus does not create the right impression’). The influence of age, gender, household income, car availability and frequency of bus use on factor scores is reported. Analysis of write-in responses extended interpretation to include travelling by bus as a social behaviour in an exchange space and a formulation of the ideal, ‘hassle-free’, urban bus journey as pleasant/deactivated.