Automatic Road Tunnel Crack Inspection Based on Crack Area Sensing and Multiscale Semantic Segmentation

The detection of crack defects on the walls of road tunnels is a crucial step in the process of ensuring travel safetyand performing routine tunnel maintenance. The automatic and accurate detection of cracks on the surface of roadtunnels is the key to improving the maintenance efficiency of road tunnels. Machine vision technology combinedwith a deep neural network model is an effective means to realize the localization and identification of crackdefects on the surface of road tunnels.We propose a complete set of automatic inspection methods for identifyingcracks on the walls of road tunnels as a solution to the problem of difficulty in identifying cracks during manualmaintenance. First, a set of equipment applied to the real-time acquisition of high-definition images of walls inroad tunnels is designed. Images of walls in road tunnels are acquired based on the designed equipment, whereimages containing crack defects are manually identified and selected. Subsequently, the training and validationsets used to construct the crack inspection model are obtained based on the acquired images, whereas the regionscontaining cracks and the pixels of the cracks are finely labeled. After that, a crack area sensing module is designedbased on the proposed you only look once version 7 model combined with coordinate attention mechanism (CAYOLOV7) network to locate the crack regions in the road tunnel surface images. Only subimages containingcracks are acquired and sent to the multiscale semantic segmentation module for extraction of the pixels to whichthe cracks belong based on the DeepLab V3+ network. The precision and recall of the crack region localizationon the surface of a road tunnel based on our proposed method are 82.4% and 93.8%, respectively. Moreover, themean intersection over union (MIoU) and pixel accuracy (PA) values for achieving pixel-level detection accuracyare 76.84% and 78.29%, respectively. The experimental results on the dataset show that our proposed two-stagedetection method outperforms other state-of-the-art models in crack region localization and detection. Based onour proposedmethod, the images captured on the surface of a road tunnel can complete crack detection at a speed often frames/second, and the detection accuracy can reach 0.25 mm, which meets the requirements for maintenanceof an actual project. The designed CA-YOLO V7 network enables precise localization of the area to which a crackbelongs in images acquired under different environmental and lighting conditions in road tunnels. The improvedDeepLab V3+ network based on lightweighting is able to extract crack morphology in a given region more quicklywhile maintaining segmentation accuracy. The established model combines defect localization and segmentationmodels for the first time, realizing pixel-level defect localization and extraction on the surface of road tunnelsin complex environments, and is capable of determining the actual size of cracks based on the physical coordinatesystemafter camera calibration. The trainedmodelhas highaccuracy andcanbe extendedandapplied to embeddedcomputing devices for the assessment and repair of damaged areas in different types of road tunnels.

A Brief Discussion on the Development of the Silk-Weaving Industry Along the “Southern Silk Road” in Yunnan

Ancient Yunnan was one of the most significant regions along China’s ancient“Southern Silk Road.”During the Nanzhao period(738–902)of the late Tang Dynasty,Yunnan’s silk-weaving industry underwent a qualitative leap as skilled silk craftsmen from the Bashu area migrated to Yunnan and introduced mulberry planting,silkworm breeding,and advanced silk-weaving techniques from Sichuan to the region.Consequently,people in Yunnan gradually acquired expertise in brocade weaving and embroidery.Many even mastered complex silk-weaving techniques.The development and progress of the silk-weaving industry in the ancient Yunnan region were intricately linked to the economic function and value of silk as both a commodity and currency along the“Southern Silk Road.”The local government in ancient Yunnan was greatly motivated by the economic interests brought by the development of silk-related industries and recognized the significance of developing the local silk industry.They even initiated a campaign to capture skilled silk craftsmen from Sichuan,aiming to foster the growth of the silk-weaving industry in Yunnan.After years of dedicated efforts from the local government in ancient Yunnan,the region emerged as a significant hub for silk production along China’s ancient“Southern Silk Road.”Despite the devastation caused by the wars in other parts of the country,Yunnan’s silk industry continued to thrive and provide ample silk products to sustain trade along this renowned route.In the contemporary era,amidst the decline of the silk-weaving industry in eastern China,Yunnan has proposed an industrial development strategy known as“relocating the silk-weaving industry from east to west.”This involves introducing advanced silk production techniques from the eastern regions into Yunnan to enhance and enrich its local silk industry,thereby establishing it as a traditional national sector and securing a competitive position within the global silk market.The historical experience of Yunnan’s silk industry demonstrated that economic development opportunities can only be seized through proactive endeavors rather than passive anticipation.The modern Yunnan silk industry,which upholds its historical traditions,continues to actively engage in international high-end technical cooperation,thus ensuring the enduring vitality of the ancient“Southern Silk Road.”

Innovation Analysis of Rural Agricultural Economic Management Model in the Context of the Belt and Road Initiative

[Objectives]To explore innovative strategies for rural agricultural economic development in the context of the Belt and Road Initiative.[Methods]This research adopts the method of literature review and field research,systematically combs the research results related to the Belt and Road Initiative and rural agricultural economic management,and deeply understands the actual situation of rural agricultural economic management.[Results]The research shows that in the context of the Belt and Road Initiative,the rural agricultural economy is facing new development opportunities and challenges,but there are also some problems.In the new period,we should accelerate the innovative development of rural agricultural economy by promoting market-oriented reform,strengthening scientific and technological innovation,optimizing the industrial structure,deepening international cooperation and other measures.The Belt and Road Initiative provides an important opportunity for the innovation of rural agricultural economic management.Rural agricultural economic management should be actively integrated into the Belt and Road construction to improve the level of rural agricultural economic management.[Conclusions]This study provides useful exploration and reference for the innovation of rural agricultural economic management models,which helps to promote the healthy development of rural agricultural economy and achieve the goal of rural revitalization.

Spatial Accessibility of Road Network in Wuhan Metropolitan Area Based on Spatial Syntax

Based on space syntax theory, the spatial accessibility of the road network in Wuhan Metropolitan Area has been quantitatively analyzed by building a series of accessibility variables. Topologic connectivity in the accessible rings appears to be broken;traffic axis network is in spatial structure of hub-and-spoke and fishbone-like. Meanwhile, the differences in classified road network have led to inefficiency of its network servo and its ever-worsening capability to respond to traffic jams. Besides, two band-like integrated cores of which one is east to west along the Yangtze River and the other is north to south along Beijing to Guangzhou Railway, have become the first level traffic axis in the whole network, which is responsible for the connectivity of the entire metropolitan area network. This consequently has strengthened the dominant position of Wuhan which is located on the bands’ crossing. In short, the spatial accessibility of that classified space morphology, the urban system, the transport infrastructure as well as the social and economic development of Wuhan Metropolitan Area are highly interrelated to each other, especially to the high level highway network featured by freeways, the development level of which is well in line with that of road network accessibility.

Road Centrality and Landscape Spatial Patterns in Wuhan Metropolitan Area,China

Road network is a corridor system that interacts with surrounding landscapes,and understanding their interaction helps to develop an optimal plan for sustainable transportation and land use.This study investigates the relationships between road centrality and landscape patterns in the Wuhan Metropolitan Area,China.The densities of centrality measures,including closeness,betweenness,and straightness,are calculated by kernel density estimation(KDE).The landscape patterns are characterized by four landscape metrics,including percentage of landscape(PLAND),Shannon′s diversity index(SHDI),mean patch size(MPS),and mean shape index(MSI).Spearman rank correlation analysis is then used to quantify their relationships at both landscape and class levels.The results show that the centrality measures can reflect the hierarchy of road network as they associate with road grade.Further analysis exhibit that as centrality densities increase,the whole landscape becomes more fragmented and regular.At the class level,the forest gradually decreases and becomes fragmented,while the construction land increases and turns to more compact.Therefore,these findings indicate that the ability and potential applications of centrality densities estimated by KDE in quantifying the relationships between roads and landscapes,can provide detailed information and valuable guidance for transportation and land-use planning as well as a new insight into ecological effects of roads.

The Development of the Deprived Urban and Rural Areas, Ingrained with the Tourist Attractions (with an Emphasis on the Silk Road)

Around the year 140 BC the Evo, the famous imperial Han Dynasty took power in China and then sent some representatives to the western land in order to communicate with the West in addition to know the political, military, geographical, economic and cultural situations of that region, it provides the basis for opening the way to the West. In this regard, they traveled to Iran and accordingly the formal relations were established between the Iranian and the Western governments and finally the Silk Road with a distance of about 8000 km has been emerged and started from the East and ended to Mediterranean Sea in the West. The aim of this study is to show that the Silk Road links throughout the world and its people together in thousands of years and the countries, cities and villages located in this road have been affected by developments or had affected and vivifying of it will lead to develop of the deprived urban and rural areas according to the abundant tourist attractions. This study which has used the historical and analytical method with practical purpose shows that cultural, scientific, religious and commercial exchanges between East and West were wide and many cities and villages were profiting of this gift. In this regard, vivifying of this road will lead to grow the underserved urban and rural areas according to many tourist attractions of the cities and villages.

Construction of Silk Road Economic Belt and Industrial Selection of Minority Areas in Northwest China

Construction of Silk Road Economic Belt is a giant engine for the economic upgrading of China.Minority areas in Northwest China since then has become a forward position for the opening to the west,which is extremely significant for expanding the hinterland of Chinese economic development,activating economic development in inland and border areas,promoting the open economic development in central and west China,and also forming a new growth pole of Chinese economy.Optimization of industrial selection can promote economic development,constant economic growth of the northwest minority areas and the construction of Silk Road Economic Belt requires the optimization and adjustment of industrial selection,cultivation of competitive industries with market prospects,and formation of new economic growth points.Minority areas in northwest China have a vast territory and abundant resources that are all powerful support for the development of local competitive industries.

An Inquiry into the Approach to Asian Regional Trade Integration Under the Belt and Road Initiative——The Case of the Alignment of a China-Japan-South Korea Free Trade Area

It has been five years since the Belt and Road Initiative (BRI) was first introduced. Though there has been a growing body of literature on regional cooperation between covered countries, Japan and South Korea have been barely discussed. This paper starts with the consensus-based mechanism of a China-Japan-South Korea Free Trade Area (FTA) to probe the approach of its alignment with the BRI in terms of the sequence of “master plans,”“viability of cooperation,” and “embedding of rules.” This inquiry found that the three countries have a shared interest in cooperation in Central Asia to which China prefers a pragmatic approach, while Japan and South Korea an approach combining idealism with pragmatism. Given the huge potential of cooperation between the trio, it is suggested that a “Central Asia chapter” be incorporated in the negotiation framework of this trilateral FTA, and that the design feature three aspects;fundamental principles, specific rules, and an executive body with a view to functionally contributing to regional trade integration in Asia. This approach may also be applied to the alignment of other Asian areas with the BRI.

A Brief Analysis of the Migration of Silk Weaving Craftsmen and the Spread of Silk Weaving Techniques in the Ancient Bashu Area along the Southern Silk Road

During ancient times,silk weaving techniques already matured in the Bashu area and“Shu Satin”silk products were widely known.Shu Satin not only performed as a high-quality commodity in the Northern Silk Road trade activities,but also conveyed cultural and social significance.Credit for the importance of Shu Satin must go to the extraordinary weavers in the Bashu area.The migration and circulation of these weavers spread the exquisite brocade and sericulture techniques throughout and beyond the Bashu area,and accelerated brocade and sericulture techniques in ancient southern China,Myanmar,and Vietnam.Accordingly,the Southern Silk Road can be seen as a path to disseminate the silk weaving techniques that originated in the Bashu area.This paper takes the migration of Shu Satin as its mainline and discusses how the weaving craftsmen spread the brocade and sericulture techniques throughout southern China during their travels and migrations,and the immeasurable contributions these craftsmen made to economic and trade activities along the ancient Southern Silk Road.This paper explores the technical accumulation and dissemination of brocade craftsmen in the Bashu area from three perspectives.The first perspective is the accumulation period of the ancient silk weaving techniques-the inflow of craftsmen from central China and the development and integration of the sericulture and silk weaving techniques in the Bashu area.The second is the technique dissemination period,centered on the silk weaving craftsmen in the Chengdu region of the Bashu area.The third is the techniques’outmigration period and the migration and circulation of craftsmen throughout the Bashu area.This paper strives to outline the dynamic lines that the Bashu silk weaving craftsmen created and the spread of their exquisite weaving techniques during their migration and circulation.This will illustrate that the ancient Southern Silk Road was not only a trade and cultural exchange zone for ancient silk commodities,but more importantly,it was a dynamic space for the dissemination and development of brocade weaving techniques.

基于GIS技术的复杂山区道路选线优化方法探讨

针对复杂山区道路选线的优化问题,提出以地理信息系统技术为基础,综合考虑地形特征和环境约束等因素,进行道路选线优化的方法,对道路网络模型进行地形参数的获取与处理,对道路节点及其连通性进行分析;在此基础上,设计多条件权衡算法并有效处理约束条件,以达到道路选线优化的目的。此种方法在实际应用中得到验证并取得了较好的效果。

农村地区道路交通安全综合治理意义及路径分析

农村地区道路交通安全工作是我国平安社会建设的有机组成部分,是确保乡村振兴建设、美丽乡村建设、新农村建设质量的前提条件。针对当前农村道路交通安全问题,需要相关部门结合农村道路特征,分别从安全管理、道路安全、人车安全等角度出发,探究出科学合理、全面有效、操作性强的综合治理策略。

丝绸之路经济带核心区建设职业教育市域产教联合体实践研究

新疆处于丝绸之路经济带核心区,是我国西部地区的重要经济中心,也是我国重要的战略区域。当前,新疆在推动职业教育与地方经济发展联动方面,开始探索建立市域产教联合体,以促进产业升级和人才培养。在实践中,市域产教联合体面临着许多困难和问题。从政策环境、校企合作、人才培养、科技创新等方面,探讨新疆建设市域产教联合体面临的主要困难、问题和挑战。在此基础上,提出建设职业教育市域产教联合体的路径,包括政策支持、产学研合作、人才培养、社会参与等方面。

城镇密集区公路桥群绿色建造创新探索

为提升城镇密集区公路绿色建造水平,结合南(沙)—中(山)高速的项目特点及工程需求,将绿色发展理念贯彻到公路设计、施工、运营、养护和管理的全寿命周期,重点研发了公路桥群工业化智能建造、公路资源综合利用、滨海湿地区公路环境保护与粤港澳大湾区交旅融合设计等四类十项创新技术。其中,预制梁环形生产线、非标准八车道等为项目特色首创技术,初步构建了典型城市群绿色桥群公路技术体系,并对未来重点发展方向进行了展望,以期丰富和完善粤港澳大湾区绿色公路技术体系,为其他高度城镇化区域可持续发展提供参考。

点云空间与反射强度融合的非结构化道路可行驶区域检测

可行驶区域检测旨在检测和提取智能车辆在道路上可行进的区域,目前主流的检测方法主要基于三维激光雷达的空间特征实现,难以处理路面边缘无清晰空间特征的非结构化道路.为此,本文提出了一种基于点云空间和反射强度融合的非结构化道路可行驶区域检测方法.首先,通过融合反射强度因子改进了基于空间特征的柱坐标系检测模型;然后,使用强度和降维空间检测对检测精度较低的环形检测模型进行优化,并将其与柱坐标系检测模型联合使用以提高方法检测准确率;最后,在自录实际道路数据集上进行对比实验.实验结果表明本文方法显著提高了非结构化道路可行驶区域检测的成功率与精确率,在结构化道路上也具有良好效果.

高速公路涉路拼宽施工对驾驶员心率增长率的影响

文中以浙江甬台温高速温州东—塘下段拼宽涉路工程为依托开展实车试验.利用Physiolab无线心理仪采集驾驶员心生理数据,研究驾驶员心率增长率指标变化特征.结果表明:涉路工程作业区路段比一般路段的驾驶员心率增长率均值和变化区间长度分别提高了16.34%、20%,并基于突变理论得到心率增长率安全水平阈值为35%,由此确定基于驾驶员心生理影响的涉路施工作业区风险路段.为驶入涉路工程作业区路段前200 m和驶出作业区后120 m.通过对涉路工程作业区六个区段的驾驶员心率增长率均值和标准差进行分析比较发现驾驶员心率增长率在工作区、上游过渡区、以及警告区变化更明显,均值较安全水平阈值分别高出18.56%、4.81%、3.52%.

基于路网中心性与可达性的城市空间特征研究:以益阳市3类城市空间为例

基于城市道路交通网络布局,探讨城市功能空间布局的合理性,对于优化城市交通网络、提高土地利用效率、促进城市高质量发展具有重要意义。本文以益阳市中心城区为例,运用ArcGIS软件的空间统计与分析功能,将道路密度、道路中心性、可达性等指标作为评价因子,结合居民出行需求调查与城市居住、商业和公园绿地3类功能空间的分布,探讨了城市交通网络与用地功能布局间的关联性。研究结果表明:1)中心城区居民日常车行通行依赖性最大,且呈明显的潮汐特征,现状路网难以匹配出行需求;2)益阳市中心城区道路网络临近中心性呈现“多中心”形态,直达中心性呈现“单中心”形态,老城地区交通通达效率与其区位重要性相匹配,但交通重要性极强且具有战略性地位的东部产业园地域反而通达效率极低,难以匹配片区战略发展需要;3)中心城区的交通可达性与城市道路(主、次干路和支路)关联性极强,而与过境的区域性道路(高速公路和国省干道)关联性弱;4)中心城区3大功能用地的交通通行能力存在一定差异,但综合来看,东部产业园以及新材料产业园组团依赖城市交通的资源获取能力更差,交通与公益性用地配套均有待加强。

提升沿边口岸在“一带一路”核心区建设中的作用研究——以新疆口岸调研为例

沿边口岸作为深化与周边国家互联互通的关键节点和重要门户,发挥着大通道、试验田和对外示范窗口的重要作用,成为“一带一路”创新对外开放的前沿阵地。本文以新疆沿边口岸调研为例,从“五通”的视角阐述了新疆丝绸之路经济带核心区建设的基本情况,并根据新疆陆路和铁路口岸、边民互市贸易区、中哈霍尔果斯边境国际合作中心等地调研情况,分析新疆沿边口岸参与“一带一路”核心区建设中,在边贸、物流、平台等方面的发展现状和存在的问题,并提出相关对策建议。

广州市“窄马路、密路网”街区交通规划提升实践

实现“窄马路、密路网”街区交通规划需要从路网指标、交通组织、设施配置等多方面进行更加精细化的管控。首先,通过总结广州市20余个“窄马路、密路网”街区规划案例,梳理该类街区的空间及交通特征,总结实施过程中存在的典型问题与成因,分析“窄马路、密路网”街区尺度和路网形态对交通组织、设施布局的影响,提出加强“窄马路、密路网”街区交通规划管控的必要性。其次,围绕街区交通效能和出行环境提升,研究形成三大规划提升策略:加强路网指标整体管控、优化街区人车交通组织、精准配置交通设施,并明确街区尺度、支路占比、道路面积率、路网连通性、公共汽车首末站小型化、停车库互联互通等详细管控要求。最后,以广州设计之都三期为例,基于综合评估提出交通规划提升方案。