第21卷第1期2021年2月交通运输系统工程与信息Journal of Transportation Systems Engineering and Information TechnologyV ol.21No.1February2021文章编号：1009-6744(2021)01-0023-07中图分类号：U15文献标志码：A DOI:10.16097/ki.1009-6744.2021.01.004基于空铁联运OD可达性的高铁时刻表优化模型可钰1，聂磊*1，袁午阳1,2(1.北京交通大学，交通运输学院，北京100044；2.中国铁道科学研究院集团有限公司，运输及经济研究所，北京100081)摘要：空铁联运的优势之一在于提高客流起讫点(Origin-Destination，OD)的可达性，为机场所服务的地区提供更多出行机会。
考虑“高铁接续航空”“航空接续高铁”两类接续服务，引入两类0-1变量表达高铁与航空的接续关系及OD可达关系，提出空铁联运OD可达性约束，描述高铁在空铁换乘枢纽的到发时刻、接续变量和OD可达变量之间的关系。
针对关键空铁联运OD，在固定航班时刻表的前提下，基于既有高铁时刻表，通过调整列车在各个车站的到发时刻，构建可达OD数量最大、时刻表调整最小的双目标高铁时刻表优化模型。
以石家庄正定机场为案例，使用京广高铁中北京-郑州区间的实际运行数据，运用ILOG CPLEX进行求解，验证模型的有效性和可行性。
结果表明，优化模型可以有效提高空铁联运OD可达数量。
关键词：综合运输；空铁联运；ILOG CPLEX；OD可达性；接续A Timetabling Model for High-speed Railway Based onAccessibility of Air and High-speed Rail Intermodality ServiceKE Yu1,NIE Lei*1,YUAN Wu-yang1,2(1.School of Traffic and Transportation,Beijing Jiaotong University,Beijing100044,China;2.Transportation&Economics Research Institute,China Academy of Railway Sciences Co.Ltd,Beijing100081,China) Abstract:One of the advantages of the air and high-speed rail(AH)intermodality service is that it improves OD (Origin-Destination)accessibility and further provides more opportunities for the areas served by the airport.Two types of services,namely“high-speed railway to air”and“air to high-speed railway”are considered in the AH intermodality service.Two kinds of variables are introduced to express the connections between trains and flights as well as OD accessibility.And OD accessibility constraints for the AH intermodality service are proposed to depict the relationship between arrival times and departure times of trains,connection variables,and OD accessibility variables.Based on key ODs of AH intermodality service,given the flight timetable and original high-speed rail timetable,the paper proposes a bi-objective optimization model to maximize the number of ODs and minimize the shift of timetabling by adjusting the arrival time and departure time at each station.A case study of Shijiazhuang Zhengding Airport is then processed to verify the validity and feasibility of the model with the practical data of Beijing-Zhengzhou section in the Beijing-Guangzhou high-speed rail corridor,and it is solved by ILOG CPLEX.The result shows the proposed model can improve OD accessibility of the AH intermodality service.Keywords:integrated transportation;air and high-speed rail intermodality service;ILOG CPLEX;OD accessibility;connection0引言高速铁路和航空的快速发展为航空-铁路联合运输提供发展契机。
中国的公共交通情况英语作文Public transportation in China has seen significant development in recent years, with the government investing heavily in infrastructure and promoting sustainable modes of transport. The country boasts an extensive network of buses, subways, trains, and even high-speed rail, offering convenient and efficient options for its citizens.One of the most impressive aspects of China's public transportation system is its extensive subway network. Major cities such as Beijing, Shanghai, and Guangzhou have some of the largest and most well-connected subway systems in the world. These subways are a popular choice for commuters due to their speed, reliability, and affordability. With ongoing expansions and renovations, the subway networks continue to grow and improve, providing an even more comprehensive and accessible service.In addition to subways, China's bus network is also an integral part of the public transportation system. Busesserve as a vital mode of transport for both urban and rural areas, connecting people to their workplaces, schools, and other essential destinations. Many cities have adopted modern, low-emission buses to tackle air pollution and promote environmental sustainability.The railway system in China is another remarkable achievement, with the introduction of high-speed trains revolutionizing long-distance travel. Thanks to the high-speed rail network, passengers can now travel between major cities at speeds exceeding 200 miles per hour, significantly reducing travel times and increasing accessibility.Moreover, China has made substantial progress in the development of eco-friendly transportation. The governmenthas incentivized the use of electric vehicles and has implemented policies to reduce emissions from traditionalvehicles. This initiative aligns with China's commitment to combating climate change and creating a cleaner and more sustainable environment.However, despite the advances in public transportation, there are still challenges to be addressed. Congestion and overcrowding continue to be issues, particularly during peak hours in major cities. Furthermore, the rapid urbanization and population growth in China have put strains on the existing infrastructure, necessitating further expansion and upgrades.In conclusion, China's public transportation system has made great strides in recent years, offering a wide range of options for commuters and travelers. The government's emphasis on sustainable and efficient transport has resulted in the creation of modern and reliable networks, contributing to the overall development and well-being of the country. As China continues to evolve and urbanize, it is crucial toprioritize the continued improvement and expansion of public transportation to meet the growing demand and support the needs of its citizens.。
对中国交通发展现状的看法英语作文全文共3篇示例，供读者参考篇1The development of transport in China has undergone tremendous changes over the past few decades. With the rapid economic growth and urbanization, the demand for transportation has significantly increased. The government has invested heavily in building roads, railways, airports, and ports to accommodate the growing needs of the population.One of the most notable achievements in China's transport development is the high-speed railway network. With over 35,000 kilometers of high-speed rail tracks, China boasts the world's largest high-speed railway network. The trains are fast, efficient, and punctual, linking major cities across the country and reducing travel time significantly. This has not only facilitated economic growth but also improved the overall quality of life for the people.In addition to railways, China has also made significant progress in road infrastructure. The highway network in China is extensive, connecting remote rural areas to major cities andimproving accessibility for goods and services. The construction of bridges and tunnels has also made transportation more convenient and efficient.The development of urban public transportation is another success story in China. Major cities like Beijing, Shanghai, and Guangzhou have well-developed subway systems that are clean, efficient, and affordable. The availability of public transportation has reduced the reliance on private cars, alleviated traffic congestion, and improved air quality in urban areas.However, despite these achievements, there are still challenges that China faces in terms of transportation development. Traffic congestion remains a significant issue in major cities, especially during peak hours. The rapid increase in the number of vehicles has strained the existing road infrastructure, leading to traffic jams and delays.Furthermore, the transportation system in rural areas is still underdeveloped. Many remote villages lack access to proper roads, making it difficult for residents to travel to urban centers for work, education, or healthcare. Improving transportation services in rural areas is crucial for promoting balanced regional development and reducing poverty.In conclusion, China has made remarkable progress in transportation development, with a well-connected network of roads, railways, and urban public transportation. While there are still challenges to overcome, such as traffic congestion and inadequate infrastructure in rural areas, the government's continued investment in transportation is crucial for sustaining economic growth and improving the quality of life for the people. By addressing these challenges and embracing new technologies, China can further enhance its transport system and create a more efficient and sustainable future.篇2Title: Thoughts on the Current Situation of Transportation Development in ChinaWith the rapid economic growth and urbanization in China, the transportation system has undergone significant improvements and changes in recent years. As a crucial part of the infrastructure, transportation plays a vital role in facilitating economic activities, promoting social development, and enhancing the overall quality of life for the people. In this essay, we will examine the current state of transportation development in China, analyze its strengths and weaknesses, and provide suggestions for further improvement.Firstly, China has made remarkable progress in developing its transportation network, especially in the construction of high-speed railways, expressways, and urban transportation systems. The high-speed rail network, for example, has become the largest in the world, connecting major cities and regions across the country with fast and convenient services. This has greatly reduced travel time and improved connectivity, making it easier for people to commute, travel, and do business. The expansion of expressways has also played a significant role in promoting economic development and regional integration.Secondly, China has been investing heavily in the development of smart transportation technologies, such as intelligent traffic management systems, electronic toll collection, and real-time traffic information services. These technologies have helped to alleviate traffic congestion, enhance safety, and improve the overall efficiency of the transportation system. With the advent of 5G technology and artificial intelligence, China is well-positioned to further enhance its transportation infrastructure and services in the future.However, despite the achievements and progress made in transportation development, there are still several challenges and issues that need to be addressed. One of the most pressingconcerns is the environmental impact of transportation, particularly air pollution and carbon emissions. The rapid increase in the number of vehicles on the roads has led to worsening air quality in many cities, posing a threat to public health and the environment. China needs to develop sustainable transportation solutions, such as promoting the use of electric vehicles, improving public transportation services, and encouraging green commuting options.Another major challenge is the imbalance in transportation development between different regions and urban-rural areas. While major cities and coastal regions have well-developed transportation networks, many rural areas and inland provinces still lack adequate infrastructure and services. This digital divide hinders economic development, reduces social equity, and limits opportunities for rural residents. China needs to adopt a more balanced and inclusive approach to transportation development, ensuring that all regions and populations benefit from improved connectivity and accessibility.In conclusion, the current state of transportation development in China is characterized by rapid progress, technological innovation, and infrastructure expansion. While there have been significant achievements, there are alsochallenges and issues that need to be addressed, such as environmental sustainability, regional disparities, and social equity. By adopting a holistic and sustainable approach to transportation development, China can build a modern, efficient, and inclusive transportation system that benefits all its citizens and contributes to sustainable development.Overall, the future of transportation in China is bright, with great potential for further advancements and improvements. By leveraging technology, innovation, and smart planning, China can build a world-class transportation system that enhances economic growth, social cohesion, and environmental sustainability. With strong leadership, strategic vision, and public participation, China can set a global example for sustainable transportation development and create a better future for its people.篇3With the rapid economic development in China, the transportation infrastructure has been continuously improving. The current status of China's transportation development can be described as a combination of challenges and opportunities.First of all, China has made significant progress in the construction of transportation networks. The high-speed rail network in China is the largest in the world, with over 35,000 kilometers of track and speeds reaching up to 350 km/h. This development has greatly improved the efficiency and convenience of travel for both passengers and cargo.Furthermore, China has also been investing heavily in the construction of highways and urban transportation systems. The highway network in China now stretches over 140,000 kilometers, connecting cities and regions across the country. In addition, many cities have developed advanced metro systems, easing traffic congestion and reducing pollution.However, despite these achievements, there are still challenges facing China's transportation development. One major issue is the imbalance between different regions. While the eastern coastal provinces have well-developed transportation networks, the western and central regions still lag behind in terms of infrastructure. This has hindered the economic development of these areas and widened the wealth gap between regions.Another challenge is the environmental impact of transportation. With the rapid increase in the number of vehicleson the roads, air pollution has become a serious problem in many Chinese cities. The government has been promoting the use of electric vehicles and public transportation to reduce emissions, but more efforts are needed to address this issue.In addition, the rapid expansion of transportation networks has also led to concerns about safety. The high-speed rail system, in particular, has experienced several accidents in the past, raising questions about the reliability and maintenance of the infrastructure.Despite these challenges, there are also opportunities for China to further improve its transportation system. With the development of new technologies such as autonomous vehicles and high-speed trains, China has the potential to become a global leader in transportation innovation. By investing in research and development, China can address many of the current challenges and create a more efficient and sustainable transportation system.In conclusion, the current status of China's transportation development is a mix of achievements and challenges. While the country has made significant progress in building infrastructure and improving efficiency, there are still issues such as regional imbalance, environmental impact, and safety concerns that needto be addressed. With strategic planning and investment, China has the potential to create a modern and sustainable transportation system that meets the needs of its growing population.。
The Rapid Development of Railways in ChinaThe railway system in China has experienced unprecedented growth over the past few decades, transforming into a modern marvel that significantly enhances both passenger and freight transportation. This rapid development has positioned China as a global leader in railway technology and infrastructure.China's railway transformation began earnestly in the early 2000s with the government's commitment to revolutionize its transport network. The introduction of high-speed rail (HSR) has been a game changer, with the first line opening between Beijing and Tianjin in 2008. Since then, the network has expanded to more than 37,000 kilometers of high-speed rails, connecting major cities across the country and reducing travel times dramatically. For example, the travel time between Beijing and Shanghai has been cut from over ten hours to just around four hours. Additionally, the Chinese government has not only focused on speed and efficiency but also on accessibility and sustainability. Efforts to expand railway lines to less developed regions help promote economic equality, while advancements in electric trains contribute to the country's environmental goals.The rapid development of the railway system in China is a testament to the country's innovative approach to transportation. Not only has it improved the daily lives of millions by making travel more accessible and efficient, but it has also spurred economic growth and set new standardsin railway technology. As China continues to expand and upgrade its railway network, it paves the way for a more connected and sustainable future.。
