检索结果-南通市图书馆

Autonomous vehicles for micro-mobility

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Autonomous Intelligent Systems 2021年第1期1卷 147-181页

作者： Henrik Christensen David Paz Hengyuan Zhang Dominique Meyer Hao Xiang Yunhai Han Yuhan Liu Andrew Liang Zheng Zhong Shiqi Tang University of California San DiegoLa JollaCalifornia 92093USA

Autonomous vehicles have been envisioned for more than 100 *** of the first suggestions was a front cover of Scientific America back in ***,it is possible to get cars that drive autonomously for extended *** are also starting to see micro-mobility solutions,such as the Nuro vehicles for pizza *** autonomous cars that can operate in urban environments with a diverse set of road-users is far from *** 2018 the Contextual Robotics Institute at UC San Diego launched an effort to build a full stack autonomous vehicle for *** motivations were diverse:i)development of a system for operation in an environment with many pedestrians,ii)design of a system that does not rely on dense maps(or HD-maps as they are sometimes named),iii)design strategies to build truly robust systems,and iv)a framework to educate next-generation *** this paper,we present the research effort of design,prototyping,and evaluation of such a *** the evaluation,several research directions are explored to account for *** and issues for future work are additionally drawn from this work.

关键词： Autonomous vehicles Intelligent systems micro-mobility

A spatiotemporal analysis of the impact of lockdown and coronavirus on London’s bicycle hire scheme:from response to recovery to a new normal

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2023年第4期26卷 664-684页

作者： Xiaowei Gao Huanfa Chen James Haworth SpaceTimelab Department of CivilEnvironmental and Geomatic EngineeringUniversity College LondonLondonUnited Kingdom Centre for Advanced Spatial Analysis University College LondonLondonUnited Kingdom

The coronavirus pandemic that started in 2019 has had wide-ranging impacts on many aspects of people’s daily *** the peak of the outbreak,lockdown measures and social distancing changed the ways in which cities *** particular,they had profound impacts on urban transportation systems,with public transport being shut down in many *** share systems(BSS)were widely reported as having experienced an increase in demand during the early stages of the pandemic before returning to pre-pandemic ***,the studies published to date focus mainly on the first year of the pandemic,when various waves saw continual relaxing and reintroductions of ***,they fall short of exploring the role of BSS as we move to the post-pandemic *** address this gap,this study uses origin-destination(O-D)flow data from London’s Santander Cycle Hire Scheme from 2019-2021 to analyze the changing use of BSS throughout the first two years of the pandemic,from lockdown to recovery.A Gaussian mixture model(GMM)is used to cluster 2019 BSS trips into three distinct clusters based on their duration and *** clusters are used as a reference from which to measure spatial and temporal change in 2020 and *** agreement with previous research,BSS usage was found to have declined by nearly 30%during the first *** then saw a sharp increase as restrictions were lifted,characterized by longer,less direct trips throughout the afternoon rather than typical peak commuting *** the aggregate number of BSS trips appeared to return to normal by October 2020,this was against the backdrop of continuing restrictions on international travel and work from home *** period between July and December 2021 was the first period that all government restrictions were *** this time,BSS trips reached higher levels than in ***-temporal analysis indicates a shift away from the traditional morning and evening peak to a more diffuse p

关键词： COVID-19 micro-mobility restrictive measures bicycle share system

On the performance of shared autonomous bicycles:A simulation study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Transportation Research 2022年第1期2卷 116-151页

作者： Naroa Coretti Sanchez Inigo Martinez Luis Alonso Pastor Kent Larson MIT Media Lab CambridgeMAUSA University of Navarra San SebastianSpain

As society faces global challenges such as population growth and climate change,rethinking cities is now more imperative than *** design of cities can not be abstracted from the design of their mobility ***,efficient solutions must be found to transport people and goods throughout the city efficiently and *** autonomous bicycle-sharing system would combine the most relevant benefits of vehicle-sharing,autonomy,and micro-mobility,increasing the efficiency and convenience of bicycle-sharing systems and incentivizing more people to bike and enjoy their cities in an environmentally friendly *** to the novelty of introducing autonomous driving technology into bicycle-sharing systems and their inherent complexity,there is a need to quantify the potential impact of autonomy on fleet performance and user *** paper presents the results of an agent-based simulation that provides an in-depth understanding of the fleet behavior of autonomous bicycle-sharing systems in realistic scenarios,including a rebalancing system based on demand *** addition,this work describes the impact of different parameters on system efficiency and service ***,it quantifies the extent to which an autonomous system would outperform current station-based and dockless bicycle-sharing *** obtained results show that with a fleet size three and a half times smaller than a station-based system and eight times smaller than a dockless system,an autonomous system can improve overall performance and user experience even with no rebalancing.

关键词： Future mobility Bicycle-sharing systems Autonomous vehicles micro-mobility Agent-based simulation Multi-agent systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

移动IP技术分析

中国数据通信 2003年第9期5卷 17-21页

作者：广小明武静中国电信集团北京研究院北京100035 信息产业部电信传输研究所北京100045

移动IPv4是基于网络层的移动管理协议,无论从位置管理还是移动切换管理都采用基于网络层IP来实现。作为支持宏观移动的技术,移动IP可以与微观移动的技术,如蜂窝IP等相结合应用。本文着重介绍移动IPv4技术的基本原理,同时从安全、路由和... 详细信息

移动IPv4是基于网络层的移动管理协议,无论从位置管理还是移动切换管理都采用基于网络层IP来实现。作为支持宏观移动的技术,移动IP可以与微观移动的技术,如蜂窝IP等相结合应用。本文着重介绍移动IPv4技术的基本原理,同时从安全、路由和网络层的移动切换的角度,引入相关的补充技术,如安全认证机制、路由优化技术和平滑切换技术,提供完善的移动IP实现。

关键词：移动IP 路由优化 Macro-mobility micro-mobility 平滑切换安全认证移动管理协议