KL-SG High-Speed Rail-a catalyst for national economic development Sri Viknesh Permalu and Karthigesu Nagarajoo

Purpose-In an increasingly interconnected world,transportation infrastructure has emerged as a critical determinant of economic growth and global competitiveness.High-speed rail(HSR),characterized by its exceptional speed and efficiency,has garnered widespread attention as a transformative mode of transportation that transcends borders and fosters economic development.The Kuala Lumpur-Singapore(KL-SG)HSR project stands as a prominent exemplar of this paradigm,symbolizing the potential of HSR to serve as a catalyst for national economic advancement.Design/methodologylapproach-This paper is prepared to provide an insight into the benefits and advantages of HSR based on proven case studies and references from global HSRs,including China,Spain,France and Japan.Findings-The findings that have been obtained focus on enhanced connectivity and accessibility,attracting foreign direct investment,revitalizing regional economies,urban development and city regeneration,boosting tourism and cultural exchange,human capital development,regionai integration and environmental and sustainability benefits.Originality/value-The KL-SG HSR,linking Kuala Lumpur and Singapore,epitomizes the potential for HSR to be a transformative agent in the realm of economic development.This project encapsulates the aspirations of two dynamic Southeast Asian economies,united in their pursuit of sustainable growth,enhanced connectivity and global competitiveness.By scrutinizing the KLSG High-Speed Rail through the lens of economic benchmarking,a deeper understanding emerges of how such projects can drive progress in areas such as cross-border trade,tourism,urban development and technological innovation.

TCP-LTE/5G Cross-layer performance analysis tool for high mobility data networking and a case study on high-speed railway

Nowadays,high mobility scenarios have become increasingly common.The widespread adoption of High-speed Rail(HSR)in China exemplifies this trend,while more promising use cases,such as vehicle-to-everything,continue to emerge.However,the Internet access provided in high mobility environments stllstruggles to achieve seamless connectivity.The next generation of wireless cellular technology 5 G further poses more requirements on the endto-end evolution to fully utilize its ultra-high band-width,while existing network diagnostic tools focus on above-IP layers or below-IP layers only.We then propose HiMoDiag,which enables flexible online analysis of the network performance in a cross-layer manner,i.e.,from the top(application layer)to the bottom(physical layer).We believe HiMoDiag could greatly simplify the process of pinpointing the deficiencies of the Internet access delivery on HSR,lead to more timely optimization and ultimately help to improve the network performance.

Study on 5G Application Scenarios in Intelligent High-Speed Railway

5G technology is indispensable for developing comprehensive perception and ubiquitous interconnection of intelligent high-speed railways(HSRs),and can be applied to many scenarios in intelligent construction,intelligent equipment,intelligent operation and in other fields.In order to promote the standardized application of 5G technology in intelligent HSRs in a scientific and orderly manner and to avoid redundant construction and wasteful investment,it is imperative to carry out a systematical top-level design of the application scenarios at the initial stage.To this end,after investigating and analyzing the 5G application demands in different aspects of HSRs and the general structure of the railway 5G network,this paper formulates an overall planning of 5G technology application scenarios and proposes solutions to some typical application scenarios in the intelligent HSR system,based on the architecture and requirements of the intelligent HSR system.

Analysis of Accuracy of a High-speed Mobile Platform Control System

The efficient manufacture technique involves a high-speed control of platform mobile system. A linear acutor is presented in this paper. The linear acutor is constructed as a linear stepper motor. However, to sustain both high accuracy and high speed for the position and speed control, A single-stack computer system is constructed and a special control algorithm is prescribed to controled the linear actuator continuously. In this paper, the nonlinear errors resulted from the magnetic saturation and the hysteresis is anaysis and discussed. In the view of electromagnetic propotional control, the actuator is a stage proportional magnet, because the driving current to the linear acuator changes for a number of cycles and a series of reset points will occur as the current undergoes cyclic changes. At each reset point the original starting characteristics of the system are re-established. A large number of reset points across the full stroke of the platform results in a significant reduction in the nonlinear behavior. The stage control is first discussed. Experiments carried out to obtain the characteristics of the mobile platform control system. It is demonstrated that with the introduction of stage control, nonlinearities, such as saturation and hysteresis, are greatly reduced, system stiffness is increased, and the positioning accuracy and resolution are improved. The effect of dither due to a "digital fragment" signal is also examined and found to be crucial in reducing the hysteresis and in improving the resolution accuracy.

Mobile Payment Enters into Scenario Era

Mobile payment is entering into an era of offline scenarios.According to the quarterly monitoring report about China’s Q2 third-party mobile payment released by Enfodesk on September 15,China’s thirdparty mobile payment market scale reached RMB 3.5 trillion in Q2,up 22.81% month-on-month.The market generally keeps a stable structure—Alipay dominating the first position with an overwhelmingly market share of 74.31%,Mowed by Tenpay(WeChat pay and QQpurse)with a market share of 13.18% and Lakala with a market share of 6.3%.

An Entire View on Research Trends in the Technology Evolution of Mobile Telecommunications

＂Without an appropriate research setting, a study cannot be qualified as a reasonable piece＂, this notion is manifested in the methodological polices. In this research, we attempt to examine previous studies within the scope of technology evolution and market perception in telecommunication industry through extracting research structures, methodologies, corresponding variables, and processing methods. A general process of social scientific research is adopted to analyze eighty-four selected papers; and simultaneously, the framework for doing this analysis is established, as well. In this manner, we inspect the subjects and the issues in these papers according to product types, academic domains, and divisions of technological evolution （from 1G to 4G）. Then, their research designs are anatomized into the key dimensions of general research conventions. This research eventually provides an entire picture of a research scenario for mobile telecommunication industry; and apparently, this framewbrk can help scholars to establish specific tendencies for academic scenarios in future research plans. Also, we propose the main streams and emerging issues can be expected to engage in the future within both theacademic and the operational fields.

Simulating Experiment and Circuit Simulation of RTD/HPT Photo-Controlled MOBILE

The MOBILE is a logic element realizing the monostable-bistable transition of a circuit that consists of two resonant tunneling transistors—the resonant tunneling diodes (RTDs) connected in series. It has several advantages including multiple inputs and multiple functions. In this paper, by connecting a heterojunction phototransistor (HPT) with the MOBILE, a novel optoelectronic functional device can be got, which presents the function of both photocurrent switching and photocurrent latching. These behaviors have been demonstrated for the first time by simulating experiments and circuit simulations, with RTDs firstly manufactured in China. Research indicates that the novel photo-controlled MOBILE has the same logic functions as conventional electrical MOBILE except for with light as an input signal.

A novel handover scheme using torch nodes and adaptive measurement aggregation mechanism to improve QoS in high-speed railway communication

Technological advancement in the field of trans- portation and communication has been happening at a faster pace in the past few decades. As the demand for high-speed transportation increases, the need for an improved seamless communication system to handle higher data traffic in a highly mobile environment becomes imperative. This paper proposes a novel scheme to enhance the quality of service in high-speed railway （HSR） communication environment using the concept of torch nodes （TNs） and adaptive measurement aggregation （AMA）. The system was modeled using an object-oriented discrete event sim- ulator, and the performance was analyzed against the existing single-antenna scheme. The simulation results show that the proposed scheme with its minimal imple- mentation overhead can efficiently perform seamless han- dover with reduced handover failure and communication interruption probability.

移动场景下反向散射混合多址算法研究

随着移动物联网的发展,在移动场景下实现高速、低功耗的信息传递具有重要研究价值。反向散射通信作为一种低功耗的通信技术可以解决功耗与能量供应问题。NOMA(非正交多址接入)是实现高频谱效率的技术,基于用户之间信道增益差进行配对通信,但是当用户信道增益差过小时,会产生强干扰进而严重影响性能,而采用OMA(正交多址接入)可以降低干扰。针对移动场景中因信道增益频繁变化而导致的性能降低以及能量供应问题,构建了移动场景下反向散射混合多址系统模型,提出反向散射设备在移动场景中使用NOMA或OMA的动态阈值,以最大化复用NOMA提升速率,剩余设备则采用OMA,并在此基础上提出最佳信道增益差配对算法。仿真结果表明,在移动场景中相较于传统方法,和速率、中断概率、复用用户数都有显著提高,在小型无人机、无人船等方面具有应用价值。

基于移动机器人的V2X室内仿真平台

针对V2X场景测试存在费用高、危险系数大和场景难搭建等问题,提出了一种基于移动机器人的V2X室内仿真平台。该仿真平台由室内移动机器人、V2X设备和显示终端组成,移动机器人实时获取自身的坐标、速度、偏航角等数据,通过滤波和校准处理后转换为GNSS数据,并通过网络通信将GNSS数据发送给V2X设备。为了验证该仿真平台的有效性,设计了V2X前向碰撞场景,并进行了实验测试。测试结果表明,该仿真平台能有效地进行V2X场景的测试。

室外广域环境下移动机器人地形障碍检测及分析方法

近年来,移动机器人已广泛应用于应急救援、公共安防、巡检探测等多个领域。在机器人移动过程中,环境感知能力尤为重要,尤其在包含动态、未知以及复杂因素干扰的室外广域工作场景中,障碍物检测极大影响机器人的功能及效率。针对地面移动机器人在此类场景下对障碍物检测的研究进展进行了对比,并根据障碍物的特征对正、负障碍检测方法进行了分析;进而概述了信息融合和深度学习在当前领域的应用现状;最后,总结了障碍物检测领域的研究现状,并指出相关技术的探索方向。

太赫兹频段高速移动场景参考信号方案研究

针对太赫兹频段高速移动场景,提出了一种参考信号方案——增强型离散傅里叶变换扩展正交频分复用(E DFT-s-OFDM)DMRS:将具有循环前缀(CP)和循环后缀(CS)的参考信号序列分割为首部和尾部参考信号序列,然后分别嵌入每个OFDM符号的尾部和首部。这种方案的优点在于,前一个OFDM符号的尾部和后一个OFDM符号的首部构成一个完整的参考信号序列,从而允许接收端在每个OFDM符号间隔内都能进行信道估计,提高了信道估计的精度和实时性。此外,相邻OFDM符号的首部和尾部参考信号序列相同,从而省去了每个OFDM符号的传统循环前缀(CP),提高了频谱效率。仿真结果表明,在太赫兹频段高速移动场景下,与5G NR DFT-s-OFDM波形的DMRS方案相比,该方案的信道估计更精确,通信系统的频谱效率更高。

动态场景中基于特征点几何约束的3D SLAM算法

针对动态场景中动态物体会导致机器人在进行位姿估计时引入大量动态误差的问题,提出一种利用特征点间几何约束来剔除动态特征点的移动机器人3D同步定位与地图构建(SLAM)算法。利用当前帧的ORB特征点与上一帧特征点生成的地图点进行投影匹配,通过引入Delaunay三角剖分法构建能够表示2帧间、匹配地图点间几何关系的三角网。利用相邻2帧地图点的几何关系变化检测出动态特征点,考虑到静态特征点可能被误检测为动态特征点而导致特征点缺失的情况,在相邻2帧匹配时提取更多的特征点以实现静态特征点的补偿,进而剔除动态特征点,实现对移动机器人位姿的精确估计。在此基础上,通过引入滑动窗口提取关键帧并完成闭环检测,从而构建出精确的3D稠密地图。在多组公开数据集上进行仿真实验及室内动态场景下的实验,结果表明,所提算法能够有效剔除动态特征点,提高移动机器人在动态场景中位姿估计的精度和地图的一致性。

基于交通事故深度调查数据的行人头部损伤特征研究

基于未来出行交通事故场景研究(Future Mobile Traffic Accident Scenario Study,FASS)数据库中135例人车碰撞事故深度调查数据,对造成行人头部损伤的来源及车速对头部损伤来源的影响进行了统计分析。采用Spearman相关系数检验法,建立了车辆速度区间与头部平均MAIS的回归模型。结果表明,行人头部致伤物主要来源于车辆,占比约58%,其次为地面,占比约40%。行人事故中,碰撞车速对行人头部损伤来源的分布情况有一定的影响,当车速低于30 km/h时,行人头部损伤主要来源为地面,当车速为[30,50]km/h时,车辆和地面对行人头部造成的损伤风险相近,当车速高于50 km/h时,行人头部损伤主要致伤物来源为车辆。因此,在进行交通损伤流行病学研究、交通损伤事故数据库构建时,特别是在中低速碰撞中,应重视地面对头部造成损伤的风险。

出行设计研究:从情境创新到机器行为设计——访谈湖南大学谭浩教授

在汽车“电动化、网联化、智能化、共享化”的大背景下,汽车设计正进行着革命性的突破,致力于构想和探索未来出行的全新情景,超越传统的框架,引领行业的未来发展。在此背景下,谭浩教授探讨了工业设计如何通过人工智能、行为科学等手段进行设计创新,以及如何在国际化和学术研究中发挥作用,提出设计研究应关注用户接受度和社会责任。

基于电动汽车换电站的配网解列下弹性提升策略的探索研究

近年来频发的自然灾害严重威胁了配电网的安全运行,而电动汽车换电站内储能电池具有易运输的特性。为提升应急供电场景下配电网弹性,本文提出了一种运输换电站储能电池的运行调度方法。首先,以应急场景下系统最小运行成本为目标,综合考虑负荷损失成本、发电成本与交通运输成本构建了含电动汽车运输交通网络的配电网络优化模型。然后,针对模型中的非线性部分展开分析,将优化问题转换为便于求解的线性混合整数优化问题,并通过算例验证了所提策略的有效性。在一定边界条件下,所提方法可智慧化调度可换电式电动汽车,将能量充足地区的储能电池调度至能量紧缺区域,降低了应急情况下电力系统运行成本,提升了电力系统整体的运行弹性。

高速移动场景中人机混编通信物理层安全技术

针对高速移动场景中人机混编通信模式下的安全问题展开研究,提出基于时延多普勒(Delay Doppler, DD)域密钥提取的正交时频空—物理层加密(Orthogonal Time Frequency Space-Physical Layer Encryption, OTFS-PLE)方法。该方法充分利用快时变信道在DD域中的稀疏性,高效准确地估计信道路径的增益、多普勒频移和时延大小,生成安全可靠的初始密钥,再通过Tent序列将初始密钥扩展成加密密钥,根据密钥对OTFS的星座点进行相位扰乱,实现高效的加解密。该方法解决了高速移动场景人机混编通信中的密钥提取难的问题,能生成可靠的密钥并实现人机混编系统安全高效的加密通信。

基于场景交互理论的折叠屏手机用户体验影响因素研究

以折叠屏手机用户的体验影响因素为主要研究对象,基于场景交互理论分析折叠屏手机用户的体验影响因素,探讨场景交互理论在折叠屏手机产品开发中的应用。首先,研究场景交互理论的发展现状,论述该理论应用于用户体验研究中的合理性;其次,通过深度访谈收集用户的场景化需求并运用MAXQDA软件进行质性研究分析,提炼出用户体验影响因素。研究结果表明,任务适用性、命令可见性、使用无障碍、操作舒适性均为影响折叠屏手机用户体验的重要因素,其中任务适用性是影响折叠屏手机用户体验的核心因素。场景化体验是折叠屏手机产品创新与发展的重要方向,场景交互理论在该产品的用户体验研究中具有重要的应用价值,从场景化体验的角度设计折叠屏手机的交互方式,可以满足用户的场景化需求,为折叠屏手机的未来体验设计提供参考依据。

基于GA-MP的低复杂度OTFS检测算法

针对正交时频空(Orthogonal Time Frequency Space,OTFS)通信系统信号检测复杂度高的问题,提出一种改进的高斯近似消息传递(Gaussian Approximate Message Passing,GA-MP)检测算法。依据最大后验概率检测准则,对发送信号及隐变量进行逐符号高斯近似,基于置信传播算法与联合因子图进行消息传递,用边缘后验概率替代GA-MP中的外部信息以减少运算量,结合阻尼因子提升收敛速度,同时引入概率阈值减少后续更新的节点数,从而使运算复杂度得到有效降低。实验结果表明,改进后的GA-MP算法在保证误码率性能的前提下具有更低的复杂度。

智能移动终端行业数字化转型场景图谱构建与实践路径研究

2024年5月,国务院常务会议审议通过《制造业数字化转型行动方案》,强调要根据制造业多样化个性化需求,分行业分领域挖掘典型场景。为准确把握企业数字化转型升级的进展情况和困难挑战,本文以智能移动终端行业为研究对象,以系统工程为方法论,聚焦产业链整体数字化转型,通过剖析“产业链环节、业务活动、典型场景、核心要素”,将分散的数字化应用场景串联起来,将流转在产业链上下游关键环节、业务活动中的数字化要素清晰呈现,最终转化为结构完整、逻辑清晰的场景图谱。透过场景图谱4类数字化要素,探析行业数字化转型重点场景依赖国外工业软件、模型资源难以拉通共享、数据要素尚未价值化、人才供给不足等问题,提出加快提高行业数字化供给能力,构建模型库为载体的行业知识中心,推进行业数据要素资源化、资产化、资本化,改革数字化人才培养机制等建议,帮助产业链上下游企业“按图索骥”,找准转型参考标杆,补齐短板弱项。