Handling Cut-In Vehicles in Strings of Cooperative Adaptive Cruise Control Vehicles

Cooperative adaptive cruise control (CACC) systems are a candidate to improve highway capacity by shortening headways and attenuating traffic disturbances. Although encouraging results have been obtained until now, a wide range of traffic circumstances has to be investigated in order to get reliable CACC systems driving on real roads. Among them, handling both vehicle-to-vehicle (V2V) communications-equipped and unequipped vehicles merging into the string of CACC vehicles is a commonly mentioned challenge. In this article, an algorithm for managing the transitions in response to cut-ins from V2V- or non-V2V-equipped vehicles is developed and tested using a string of four CACC vehicles. A CACC controller is implemented in four production Infiniti M56s vehicles and tested in real traffic, where non-V2V-equipped vehicles can cut in. The effects of a vehicle performing a cut-out are also investigated. Then responses to cut-ins by equipped and nonequipped vehicles are simulated for longer strings of vehicles using car-following models for both the production adaptive cruise control (ACC) system and the newly developed CACC controller. Results demonstrate that the CACC system is able to handle cut-in vehicles without causing major perturbations, while also reducing significantly the impact of this maneuver on the following vehicles, improving traffic flow.     

Solving the K-shortest paths problem in timetable-based public transportation systems

Finding the K-shortest paths in timetable-based public transportation systems is an important problem in practice. It has three typical variants: the K-earliest arrival problem (K-EAP), the K-shortest travel time problem (K-STTP), and the K-minimum number of transfers problem (K-MNTP). In this article we show that these problems can be solved efficiently by first modeling the timetable information with the time-expanded approach, then applying the Martins and Santos (MS) algorithm. Then we model the timetable information with the time-dependent approach and propose a modified version of the MS algorithm for solving the K-EAP. Experimental results on real-world data show that for K smaller than 100, which is enough for most applications, the execution times of the MS algorithm for the problems in the time-expanded model are less than 100 ms on a server with a 1.86-GHz central processing unit (CPU) and 4 GB of memory. For solving the K-EAP the modified MS algorithm in the time-dependent model is even more efficient (about three times faster for K ≤ 100) than the original algorithm in the time-expanded model. Our results imply the great potential of the MS algorithms in practical transportation service systems.     

高速铁路建设项目协调管理研究

我国已步入高速铁路建设的高速发展阶段,在其建设过程中需要协调好各方面关系,以确保项目建设的顺利进行。针对高速铁路建设项目管理现状,分别从项目内部及外部两个方面对项目协调管理内容进行分析,并在此基础上提出加强组织文化建设、建立科学管理模式以及加强信息管理等方面的协调管理措施。     

省级卫视如何为西北少数民族文化传播助力

鉴于西北少数民族文化传播对我国传统文化繁荣和民族团结、稳定的重要意义,以及独具地方色彩和全国覆盖力的省级卫视在西北少数民族文化传播中的特殊效力,针对西北多民族省份省级卫视的少数民族文化节目传播状况,探讨西北少数民族文化良性传播和西北地区省级卫视借助民族文化突围的双向关系,在此基础上,分析西北地区省级卫视如何通过转变传播理念、传播形态、运作模式,在打造自身竞争差异和优势的同时,为少数民族文化传播积极发挥作用。     

城市公园景观重构与地域文化传承

城市公园是城市景观的集中体现,是城市生态的恢复空间,能够反映所处城市的文化属性。地域文化与城市公园融合一体是景观再生重构的重要途径。地域文化是城市公园景观文化功能重构的关键因素,城市公园景观是地域文化表现的直接载体。现代城市公园景观重构必须充分挖掘和融合地域文化元素,创造更具生命力的新型景观。主要基于地域文化与景观重构的相互关系,以及地域文化在景观重构中的价值维度和作用原理,提出城市公园景观重构建设的地域文化功能提升策略。     

对龙舟文化起源与功能的新思考

通过文献资料法、专家访谈法和逻辑归纳法,对龙舟文化的相关内容进行了探究分析。研究发现龙舟文化的起源和宗教祭祀有着密切关系,龙舟文化有爱国教育和文化传承功能。龙舟运动有一定的团结、娱乐、健身、教育和经济功能。     

释放网络文化正能量

信息时代人们“数字化生存”离不开网络文化建设,凝心聚力实现“中国梦”需要网络文化正能量的给力释放。网络文化释放心灵正能量,释放青春正能量,释放人生正能量,让“数字化生存”充溢正能量。     

辽宁老工业基地振兴与交通运输事业发展

从公路、港口、运输三个方面,分析了交通运输事业对辽宁老工业基地全面振兴的支撑作用.从立足全局抓交通、转型升级抓交通、改善民生抓交通、加强管理抓交通、改革创新抓交通五个方面,阐述了辽宁老工业基地全面振兴对交通运输事业发展的基本要求.从完善交通运输领域法律法规、构建大交通管理体制、建立新的投融资体系、提升行业监管能力、加快推进信息化、加强干部队伍建设六个方面,提出了实现辽宁交通运输事业又好又快发展的保障措施.     

浅谈修船企业的质量管理

文章主要阐述了质量管理的重要性,确保质量管理有效运行的重要手段和质量管理持续改进的方法,与同行从事质量管理人员进行交流,以便进一步提高质量管理水平。     

由如何抓好企业文化落地而引发的思考

山海关船舶重工有限责任公司在企业文化建设方面做了大量工作,但企业文化建设工作发展还不够平衡,文章阐述了企业文化建设难在何处,分析了影响企业文化落地的关键因素,并提出了促进企业文化落地的对策。