1,720,985 research outputs found
Multicast in Network and Application Layer
No full textElectrical Engineering, Mathematics and Computer Scienc
Multicriteria evaluation of the High Speed Rail, TransRapid Maglev and Hyperloop systems
No full textThis paper presents the multicriteria evaluation of the High Speed Rail (HSR),TransRapid Maglev (TRM) and Hyperloop (HL) passenger transport system assumed to operate as the mutually exclusive alternatives along the given line/corridor. For such a purpose the methodology is synthesized consisting of the analytical models of indicators of performances of these systems used as the evaluation criteria and the multicriteria Simple Additive Weighting (SAW) method. Given the characteristics of infrastructure and rolling stock/fleet of vhicles/trains reflecting the systems’ infrastructural and technical/technological performances, the indicators of operational, economic, environmental, and social performances are defined and modelled respecting the interests and preferences of the particular actors/stakeholders involved. These areusers/passengers, the systems’ transport operators, local, regional, and national authorities and investors, and community members. The proposed methodology is applied to the line/corridor Moscow – St. Petersburg (Russia) by assuming that three HS systems exclusively operate there according to “what-if’ scenario approach. The results indicate that, under given conditions, the HL is the preferable compared to the TRM and HSR alternative.Transport and Plannin
Modelling the resilience of rail passenger transport networks affected by large-scale disruptive events: the case of HSR (high speed rail)
No full textThis paper deals with modelling the dynamic resilience of rail passenger transport networks affected by large-scale disruptive events whose impacts deteriorate the networks’ planned infrastructural, operational, economic, and social-economic performances represented by the selected indicators. The indicators of infrastructural performances refer to the physical and operational conditions of the networks’ lines and stations, and supportive facilities and equipment. Those of the operational performances include transport services scheduled along particular routes, their seating capacity, and corresponding transport work/capacity. The indicators of economic performances include the costs of cancelled and long-delayed transport services imposed on the main actors/stakeholder involved—the rail operator(s) and users/passengers. The indicators of social-economic performances reflect the compromised accessibility and consequent prevention of the user/passenger trips and their contribution to the local/regional/national Gross Domestic Product. Modeling resulted in developing a methodology including two sets of analytical models for: (1) assessing the dynamic resilience of a given rail network, i.e., before, during, and after the impacts of disruptive event(s); and (2) estimation of the indicators of particular performances as the figures-of-merit for assessing the network’s resilience under the given conditions. As such, the methodology could be used for estimating the resilience of different topologies of rail passenger networks affected by past, current, and future disruptive events, the latest according to the “what-if” scenario approach and after introducing the appropriate assumptions. The methodology has been applied to a past case—the Japanese Shinkansen HSR network affected by a large-scale disruptive event—the Great East Japan Earthquake on 11 March 2011.Transport and PlanningAir Transport & Operation
Estimation of direct energy consumption and CO<sub>2</sub> emission by high speed rail, transrapid maglev and hyperloop passenger transport systems
No full textThis paper deals with estimation of direct energy consumption and related emissions of GHG exclusively, including CO2, by the High Speed Rail (HSR), Trans Rapid Maglev (TRM), and Hyperloop (HL) passenger transport systems. This includes developing the corresponding analytical models based on the mechanical energy and applying them according to the specified what-if operating scenarios. The analogous models are developed and applied to the Air Passenger Transport (APT) system for comparison purposes. The results of the application of the proposed models under given conditions have indicated that the average and total energy consumption and related emission of CO2 of the three systems have been generally sensitive, i.e. elastic to variations of the nonstop journey distance and the vehicle/train seating capacity. Their average values have decreased more than proportionally and total values in proportion with increasing of the nonstop journey distance. Both have decreased with increasing of the vehicle/train seating capacity per departure. In the case of supplying equivalent equally utilized transport capacities, the HSR and the TRM have had lower energy consumption and related emission of CO2 than the HL system. As well, the HSR, the TRM, and the HL have had lower energy consumption and related CO2 emission than the selected APT aircraft up to some ‘breaking’ journey distance under given what-if operating scenarios.Transport and Plannin
A methodology for assessing resilience of the HSR (high speed rail) network affected by disruptive event(s)
No full textThis paper deals with modelling of resilience, i.e., vulnerability of the HSR (High Speed Rail) transport network affected by the system’s internal and external disruptive events both acting either individually or together/ The former events can generally be sudden unpredictable failures of the network’s components, i.e., particular facilities and equipment both on board the HS (High Speed) trolling stock and along the lines (power system, controlcommunications and signalling system, etc.). In addition, the specific events can be traffic incidents/accidents and industrial actions of the railway staff. The latter events can be natural disasters (for example earthquakes), bad weather (strong wind, heavy rain and snow falls, flooding, etc.) and terrorists; threats and attacks. In all above-mentioned cases, the given impacts are of the intensity to deteriorate scheduled/planned transport services causing their cancellations or long delays, thus imposing additional direct costs on the main actors/stakeholders involved such as userspassengers and rail transport service providers. In order to enable assessment of resilience, i.e., vulnerability of a given HSR network already being or is expected to be likely affected by given disruptive event(s), and estimate the overall costs of its impact, a convenient methodology consisting of the set of analytical models is developed with an explanation how it could be applied to the particular cases using the “what-if” scenario approach
Future advanced long-haul Evacuated Tube Transport (EET) system operated by TransRapid Maglev (TRM): a multidimensional examination of performance
No full textThis paper presents a multidimensional examination of the infrastructural, technical/technological, operational, economic, environmental, social, and policy performance of the future advanced Evacuated Tube Transport (ETT) system operated by TransRapid Maglev (TRM) (the ETT-TRM system). The examination implies analyzing, modeling, and estimating selected performance criteria using the case of the Trans-Atlantic passenger transport market currently served exclusively by the Air Passenger Transport (APT) system. The purpose is to assess the ETT-TRM system’s competitive capabilities compared to those of the current and future APT system and consequently its potential contribution to mitigating impacts of both systems on society and the environment–the sustainability of the transport sector - under given conditions.Transport and Plannin
The economic performance of supply chain(s) served by the mega freight transport vehicles
No full textThis paper deals with the economic performances of supply chain(s) served by different including the mega freight transport vehicles. These performances are considered as a dimension of the supply chain’s sustainability together with the infrastructural, technical/technological, operational, environmental, and social performances. The supply chain(s) consists of the spoke and hub supplier(s) and the hub and spoke consumer(s) of goods/freight shipments. The economic performances include the inventory, handling, and transport cost of goods/freight shipments processed in the chain(s). The analytical model is developed for estimating the above-mentioned economic performances of the generic configuration of supply chain(s) operating according to the specified scenario(s) under given conditions. Then, the model is applied to the intercontinental supply chain exclusively served by the conventional and mega container ships aiming at investigating their effects/impacts on the chain’s economic performances.Transport & Planning / Control & OperationsCivil Engineering and Geosciences / Aerospace Engineerin
Modelling performance an air transport network operated by subsonic and supersonic aircraft
No full textThis paper deals with modelling the performance of an air transport network operated by existing subsonic and the prospective supersonic commercial aircraft. Analytical models of indicators of the infrastructural, technical/technological, operational, economic, environmental, and social performance of the network relevant for the main actors/stakeholders involved are developed. The models are applied to the given long-haul air route network exclusively operated by subsonic and supersonic aircraft according to the specified "what-if"scenarios.The results from application of the models indicate that supersonic flights powered by LH2 (Liquid Hydrogen) could be more feasible than their subsonic counterparts powered by Jet A fuel, in terms of about three times higher technical productivity, 46% smaller size of the required fleet given the frequency of a single flight per day, 20% lower sum of the aircraft/airline operational, air passenger time, and considered external costs, up to two times higher overall social-economic feasibility, and 94% greater savings in contribution to global warming and climate change. These flights could be less feasible in terms of about 70-85% higher aircraft/airline operational costs, 70% and 19% higher fuel consumption and emissions of Green House Gases, respectively, and 6-13% higher noise compared to the specified acceptable levels. Transport and Plannin
Modeling resilience, friability, and cost of an airport affected by the large-scale disruptive event
No full textThis paper deals with modeling resilience, friability, and cost of an airport affected by the largescale disruptive event. These events affecting the airport's operations individually or in combination can be bad weather, failures of particular crucial aiiport and ATC (Air Traffic Control) components, industrial actions of the aviation staff, natural disasters, traffic incidents/accidents and/or terrorist threats/attacks. The affected airport and its users airlines and air passengers can be imposed the additional (usually substantive) cost due to the preventive actions aiming at maintaining both the airport's resilience and safety at the acceptable level under given conditions. These actions include delaying, cancelling, and/or rerouting particular flights. In order to estimate resilience, friability, and cost of a given airport including those of airlines and their users - air passengers during affection of the large-scale disruptive event, an appropriate methodology consisting of the dedicated models is developed and applied to the selected airport's case.Transport & PlanningCivil Engineering and Geoscience
A multidimensonal Examination of Prefomences of the Future advanced Transport Systems: The ETT (Evacuated Tube Transport) TRM (Transrapid MAGLEV) System
No full textMultidimensional examination of performances of the future advanced ETT Evacuated Tube Transport) system operated by TRM (TransRapidMaglev); assessment of the ETT TRM system contribution to sustainability of the future transport sector through its completion with APT (Air Passenger Transport) system In the given case - long-haul (North-Atlantic) passenger transport market
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