With the acceleration of the construction of a strong transportation country,the multi-modal transportation"data brain"has become an important engine driving and leading the high-quality development of the transportation industry.However,there is currently no consensus in the academic community on the definition and connotation of the"data brain"in comprehensive transportation,and its functional positioning and service boundaries have not been systematically and comprehensively studied.Based on a systematic review of literature on intelligent transportation systems,in the paper,the definition and connotation of the"data brain"in comprehensive transportation are proposed,the basic characteristics of"comprehensive perception,spatiotemporal interaction,intelligent deduction,and iterative evolution"are analyzed,and a comparative analysis perspective is used to explore the service boundaries of the"data brain"in comprehensive transportation.The functional positioning of the"data brain"in comprehensive transportation is clarified from multiple dimensions such as biomimetic simulation,scenario application,sustainability,and social responsibility,aiming to provide theoretical support for the joint construction of the"data brain"in multi-modal transportation across the country,and fully leverage the amplification,superposition,and multiplication effects of comprehensive transportation data elements.
In order to solve the adverse effects of hidden landslide disasters in densely vegetated mountainous areas on the whole life cycle of expressways,by taking advantage of the characteristics of airborne LiDAR to penetrate vegetation,a high-precision DEM with a spatial resolution of 0.2 m is obtained for the highway under construction in the G0321 Qimen to Anhui-Jiangxi boundary section(K2+430～K14+750),a remote sensing interpretation method suitable for dense vegetation mountainous areas is prepared,a sample database of landslide disasters in the study area is established,and the accuracy of remote sensing interpretation is verified through manual field review.Comprehensively Considering the topography,meteorology and hydrology,and field verification,8 disaster-causing evaluation factors are selected,and the information coupled MaxEnt model(Ⅳ-MaxEnt)is used to evaluate the susceptibility of landslides in dense vegetation mountainous areas.The evaluation results show that the empirical RMS value of the receiver operating characteristic curve(ROC)of the evaluation model is 0.901,indicating that the accuracy of the model has high accuracy,which is of great engineering significance for the route selection,construction and operation stages of the expressway.
为研究大吨位PC箱梁在整孔预制过程中水化热温度场的分布特征和发展规律,对50 m PC箱梁在浇筑过程中进行了水化热温度场的现场监测和分析.研究结果表明:箱梁在整孔预制过程中水化热温度呈现出"快速升温—高温持续—缓慢降温"的发展过程,各截面温度分布左右对称,最高温出现在S1截面腹板中部的芯部,达到74℃,S1、S2截面的最高温度均超过了 70℃,且高温持续时间较长;各截面温差呈现出"快速增大—缓慢减小"的发展过程,最大温差均出现在腹板—顶板交接处与顶板表面之间,且左右两侧温差分布基本一致,S1、S2截面的最大温差均超过25℃,易造成混凝土的开裂,应在箱梁施工过程中采取相应的控温措施.研究成果可为大吨位PC箱梁的整孔预制提供参考.
The CPC Central Committee has positioned Xiong’an New Area as an “innovative development demonstration area for implementing the new development concept”. The transportation of Xiong’an new area should set a good example and take the lead in the comprehensive, accurate and complete implementation of the new development concept. Transportation bears the functional positioning of “pioneer”, “main skeleton” and “relief carrier” in the planning and construction of Xiong’an new area. Focus on the long-term strategic planning and vivid practice of 15 main directions of transportation development in Xiong’an new area. Systematically deconstruct the experience, measures and schemes of Xiong’an transportation to fully grasp, accurately understand and totally implement the new development concept. It provides an important reference for accelerating the pilot construction of traffic power in Xiong’an new area and building a traffic demonstration benchmark for implementing the new development concept.
Business model innovation faces multiple tests of legitimacy. Most extant research in this area has been conducted from institutional and strategic perspectives while paying insufficient attention to the perspective of evaluators. Based on the institutionalization of China's online car-hailing industry from 2012 to 2018, this paper analyzes the legitimacy judgment of the stakeholders from the perspective of evaluator categorization and explores the legitimation mechanism of business model innovation. It finds that evaluators judge the legitimacy of business models based on category cognition. Therefore, to achieve the bridging, spillover, and accumulation effects of legitimacy, the legitimation strategy of online car-hailing platforms should dynamically adapt to different evaluators, judgment models, and categorization standards. Ultimately, as quantitative changes lead to qualitative changes, the legitimation of innovative business models is achieved in this way. In this process, stakeholders categorize and evaluate online car-hailing based on prototypes and value goals, and establish a two-way interactive mechanism, which is from behavior guided by cognition to cognition given feedback by behavior. This paper combines the legitimacy judgment with category theory to explain how individual cognition drives the emergence of new categories and identifies a series of legitimacy strategies based on categorization, thus providing theoretical support and practical inspiration for exploring the legitimation of business model innovation.
