随着汽车智能化、网联化、共享化、电动化的发展,汽车软件迭代频繁且车内通信数据激增,传统总线无法满足需求,需引入以太网通信。远程在线升级(Over the Air,OTA)需告知用户升级内容,涉及大量数据传输,故采用基于以太网的IP面向服务可...随着汽车智能化、网联化、共享化、电动化的发展,汽车软件迭代频繁且车内通信数据激增,传统总线无法满足需求,需引入以太网通信。远程在线升级(Over the Air,OTA)需告知用户升级内容,涉及大量数据传输,故采用基于以太网的IP面向服务可扩展通信协议(SOME/IP)。本文结合OTA升级功能,介绍基于SOME/IP协议的开发流程与方法,为车载以太网网络开发提供指导。展开更多
随着汽车“新四化”的发展,汽车软件更新迭代频繁,传统的离线升级功能已无法满足用户及车企需求,因此需要开发汽车远程空中下载(Over the air,OTA)升级功能。通过OTA升级,车企可实时向车辆推送新功能,持续优化用户的产品体验。然而,OTA...随着汽车“新四化”的发展,汽车软件更新迭代频繁,传统的离线升级功能已无法满足用户及车企需求,因此需要开发汽车远程空中下载(Over the air,OTA)升级功能。通过OTA升级,车企可实时向车辆推送新功能,持续优化用户的产品体验。然而,OTA升级过程涉及车端、云端、通信链路多环节的数据交互,使车辆面临网络攻击的风险。本文从升级包安全、车云链路安全、车端安全存储及安全监测与应急响应四个维度,系统介绍商用汽车OTA功能开发中的信息安全应对方案,为商用汽车OTA安全落地提供技术参考。展开更多
This paper introduces a mixed-mode biquad employing OTAs （operational trans-conductance amplifiers） and grounded capacitors. The circuit can perform mixed-mode operation by selecting the input and output terminals. ...This paper introduces a mixed-mode biquad employing OTAs （operational trans-conductance amplifiers） and grounded capacitors. The circuit can perform mixed-mode operation by selecting the input and output terminals. Additionally, the circuit enables low-pass, band-pass, high-pass, band-stop and all-pass transfer functions suitably choosing the input terminals. The circuit parameters ω0 and Q can be tuned orthogonally through adjusting the trans-conductance gains of the OTAs. The biquad enjoys very low sensitivities with respect to the circuit active and passive components. The achievement examples are given together with simulation results by PSPICE.展开更多
A novel current mode active-only universal filter using four dual current output Operational Transconductance Amplifiers (OTAs) and three Operational Amplifiers (OAs) is presented. The circuit can realize low pass and...A novel current mode active-only universal filter using four dual current output Operational Transconductance Amplifiers (OTAs) and three Operational Amplifiers (OAs) is presented. The circuit can realize low pass and high pass filter characteristics by choosing the suitable current output branches. The filter performance factors natural frequency (ω0), bandwidth , quality factor Q and transconductance gain gm are electronically tunable. The proposed circuit has very low sensitivities with respect to circuit active elements. From sensitivity analysis, it has been clearly shown that the proposed circuit has very low sensitivities with respect to the circuit active elements. The gain roll-off of high pass and low pass configuration is 18 dB/oc- tave. The proposed circuit facilitates integrability, programmability and ease of implementation.展开更多
随着汽车电子化、智能化发展,电子电气架构向计算中央化、数据和能源区域化演进,车载计算平台的集中化使相关需求指数级提升。智能中央计算平台作为汽车电子架构核心,其刷写技术对提升汽车性能、优化用户体验意义重大。本文探讨该平台...随着汽车电子化、智能化发展,电子电气架构向计算中央化、数据和能源区域化演进,车载计算平台的集中化使相关需求指数级提升。智能中央计算平台作为汽车电子架构核心,其刷写技术对提升汽车性能、优化用户体验意义重大。本文探讨该平台软件刷写总体方案,深入研究基于互联网的诊断协议(Diagnostics over Internet Protocol,DoIP)升级、空中下载技术主控制器、智能部件刷写等关键技术。结果表明,其具备高性能处理、低延迟跨核通信等优势,能有效提升汽车模块更新效率,可为汽车智能化发展提供技术支撑。展开更多
针对于工业场所中密集场景下安全帽佩戴出现的漏检情况以及提高检测精度,提出了一种基于改进YOLOv5s的工业安全帽检测算法.首先,采用CIOU优化Soft-NMS对密集人群重叠的情况,减少重叠目标的漏检,从而提高了安全帽检测的准确性.其次,在网...针对于工业场所中密集场景下安全帽佩戴出现的漏检情况以及提高检测精度,提出了一种基于改进YOLOv5s的工业安全帽检测算法.首先,采用CIOU优化Soft-NMS对密集人群重叠的情况,减少重叠目标的漏检,从而提高了安全帽检测的准确性.其次,在网络的中间层添加辅助训练头引入丰富的梯度信息,最后,辅助训练头结合Optimal Transport Assignment添加到Loss中,通过最优的目标匹配,减少模型的漏检和误检的情况,从而提升模型的准确率和召回率.实验结果表明,改进后的算法平均精确值(mAP@50-90)值为68.3%,相对于原YOLOv5s算法提升了3.8%,准确率为92.3%,相较于原YOLOv5s算法提高了0.7%.展开更多
2023年国内旅游市场迅速恢复,预计2024年国内旅游人数将超过60亿人次。特别是在线旅游代理(OTA)平台,随着国内市场的复苏,表现出色。随着邮轮行业的发展,特别是在疫情之后,中国的邮轮市场预计将显著增长,成为全球最大的邮轮市场。本文...2023年国内旅游市场迅速恢复,预计2024年国内旅游人数将超过60亿人次。特别是在线旅游代理(OTA)平台,随着国内市场的复苏,表现出色。随着邮轮行业的发展,特别是在疫情之后,中国的邮轮市场预计将显著增长,成为全球最大的邮轮市场。本文通过分析五个主要OTA平台(携程、同程、飞猪、去哪儿网、途牛)中的五家邮轮公司(皇家加勒比、MSC地中海、公主、诺唯真、爱达邮轮)的邮轮产品定价,旨在揭示不同平台和公司间的定价现状与策略。研究发现,国际航线的价格普遍高于国内航线,不同平台在国内外航线的运营存在显著差异,这与邮轮公司的市场策略紧密相关。此外,本文还分析了旅行天数、出发时间以及船龄对价格的影响,并针对邮轮公司和OTA平台提出了一系列优化定价和合作的建议,以进一步发展中国的邮轮市场并提升用户体验。In 2023, the domestic tourism market in China rapidly recovered, with the number of domestic tourists expected to exceed 6 billion in 2024. Online Travel Agency (OTA) platforms, in particular, have performed exceptionally well as the domestic market has rebounded. With the development of the cruise industry, especially post-pandemic, China’s cruise market is anticipated to grow significantly, potentially becoming the largest cruise market globally. This paper analyzes the pricing of cruise products from five major OTA platforms (Ctrip, Tongcheng, Fliggy, Qunar, Tuniu) and five cruise companies (Royal Caribbean, MSC Mediterranean, Princess Cruises, Norwegian Cruise Line, AIDA Cruises). The aim is to reveal the current pricing status and strategies across different platforms and companies. The study finds that international route prices are generally higher than domestic route prices and that there are significant operational differences in domestic and international routes across different platforms, closely related to the market strategies of the cruise companies. Additionally, this paper analyzes the impact of travel duration, departure time, and ship age on pricing and offers a series of recommendations for cruise companies and OTA platforms to optimize pricing and cooperation. These recommendations aim to further develop China’s cruise market and enhance user experience.展开更多
文摘随着汽车智能化、网联化、共享化、电动化的发展,汽车软件迭代频繁且车内通信数据激增,传统总线无法满足需求,需引入以太网通信。远程在线升级(Over the Air,OTA)需告知用户升级内容,涉及大量数据传输,故采用基于以太网的IP面向服务可扩展通信协议(SOME/IP)。本文结合OTA升级功能,介绍基于SOME/IP协议的开发流程与方法,为车载以太网网络开发提供指导。
文摘随着汽车“新四化”的发展,汽车软件更新迭代频繁,传统的离线升级功能已无法满足用户及车企需求,因此需要开发汽车远程空中下载(Over the air,OTA)升级功能。通过OTA升级,车企可实时向车辆推送新功能,持续优化用户的产品体验。然而,OTA升级过程涉及车端、云端、通信链路多环节的数据交互,使车辆面临网络攻击的风险。本文从升级包安全、车云链路安全、车端安全存储及安全监测与应急响应四个维度,系统介绍商用汽车OTA功能开发中的信息安全应对方案,为商用汽车OTA安全落地提供技术参考。
文摘This paper introduces a mixed-mode biquad employing OTAs （operational trans-conductance amplifiers） and grounded capacitors. The circuit can perform mixed-mode operation by selecting the input and output terminals. Additionally, the circuit enables low-pass, band-pass, high-pass, band-stop and all-pass transfer functions suitably choosing the input terminals. The circuit parameters ω0 and Q can be tuned orthogonally through adjusting the trans-conductance gains of the OTAs. The biquad enjoys very low sensitivities with respect to the circuit active and passive components. The achievement examples are given together with simulation results by PSPICE.
文摘A novel current mode active-only universal filter using four dual current output Operational Transconductance Amplifiers (OTAs) and three Operational Amplifiers (OAs) is presented. The circuit can realize low pass and high pass filter characteristics by choosing the suitable current output branches. The filter performance factors natural frequency (ω0), bandwidth , quality factor Q and transconductance gain gm are electronically tunable. The proposed circuit has very low sensitivities with respect to circuit active elements. From sensitivity analysis, it has been clearly shown that the proposed circuit has very low sensitivities with respect to the circuit active elements. The gain roll-off of high pass and low pass configuration is 18 dB/oc- tave. The proposed circuit facilitates integrability, programmability and ease of implementation.
文摘随着汽车电子化、智能化发展,电子电气架构向计算中央化、数据和能源区域化演进,车载计算平台的集中化使相关需求指数级提升。智能中央计算平台作为汽车电子架构核心,其刷写技术对提升汽车性能、优化用户体验意义重大。本文探讨该平台软件刷写总体方案,深入研究基于互联网的诊断协议(Diagnostics over Internet Protocol,DoIP)升级、空中下载技术主控制器、智能部件刷写等关键技术。结果表明,其具备高性能处理、低延迟跨核通信等优势,能有效提升汽车模块更新效率,可为汽车智能化发展提供技术支撑。
文摘针对于工业场所中密集场景下安全帽佩戴出现的漏检情况以及提高检测精度,提出了一种基于改进YOLOv5s的工业安全帽检测算法.首先,采用CIOU优化Soft-NMS对密集人群重叠的情况,减少重叠目标的漏检,从而提高了安全帽检测的准确性.其次,在网络的中间层添加辅助训练头引入丰富的梯度信息,最后,辅助训练头结合Optimal Transport Assignment添加到Loss中,通过最优的目标匹配,减少模型的漏检和误检的情况,从而提升模型的准确率和召回率.实验结果表明,改进后的算法平均精确值(mAP@50-90)值为68.3%,相对于原YOLOv5s算法提升了3.8%,准确率为92.3%,相较于原YOLOv5s算法提高了0.7%.
文摘2023年国内旅游市场迅速恢复,预计2024年国内旅游人数将超过60亿人次。特别是在线旅游代理(OTA)平台,随着国内市场的复苏,表现出色。随着邮轮行业的发展,特别是在疫情之后,中国的邮轮市场预计将显著增长,成为全球最大的邮轮市场。本文通过分析五个主要OTA平台(携程、同程、飞猪、去哪儿网、途牛)中的五家邮轮公司(皇家加勒比、MSC地中海、公主、诺唯真、爱达邮轮)的邮轮产品定价,旨在揭示不同平台和公司间的定价现状与策略。研究发现,国际航线的价格普遍高于国内航线,不同平台在国内外航线的运营存在显著差异,这与邮轮公司的市场策略紧密相关。此外,本文还分析了旅行天数、出发时间以及船龄对价格的影响,并针对邮轮公司和OTA平台提出了一系列优化定价和合作的建议,以进一步发展中国的邮轮市场并提升用户体验。In 2023, the domestic tourism market in China rapidly recovered, with the number of domestic tourists expected to exceed 6 billion in 2024. Online Travel Agency (OTA) platforms, in particular, have performed exceptionally well as the domestic market has rebounded. With the development of the cruise industry, especially post-pandemic, China’s cruise market is anticipated to grow significantly, potentially becoming the largest cruise market globally. This paper analyzes the pricing of cruise products from five major OTA platforms (Ctrip, Tongcheng, Fliggy, Qunar, Tuniu) and five cruise companies (Royal Caribbean, MSC Mediterranean, Princess Cruises, Norwegian Cruise Line, AIDA Cruises). The aim is to reveal the current pricing status and strategies across different platforms and companies. The study finds that international route prices are generally higher than domestic route prices and that there are significant operational differences in domestic and international routes across different platforms, closely related to the market strategies of the cruise companies. Additionally, this paper analyzes the impact of travel duration, departure time, and ship age on pricing and offers a series of recommendations for cruise companies and OTA platforms to optimize pricing and cooperation. These recommendations aim to further develop China’s cruise market and enhance user experience.
