Anti-Spoofing:Integrated Information Authentication of BeiDou-ⅡCivil Navigation Message

The BeiDou-Ⅱcivil navigation message(BDⅡ-CNAV)is transmitted in an open environment and no information integrity protection measures are provided.Hence,the BDⅡ-CNAV faces the threat of spoofing attacks,which can lead to wrong location reports and time indication.In order to deal with this threat,we proposed a scheme of anti-spoofing for BDⅡ-CNAV based on integrated information authentication.This scheme generates two type authentication information,one is authentication code information(ACI),which is applied to confirm the authenticity and reliability of satellite time information,and the other is signature information,which is used to authenticate the integrity of satellite location information and other information.Both authentication information is designed to embed into the reserved bits in BDⅡ-CNAV without changing the frame structure.In order to avoid authentication failure caused by public key error or key error,the key or public key prompt information(KPKPI)are designed to remind the receiver to update both keys in time.Experimental results indicate that the scheme can successfully detect spoofing attacks,and the authentication delay is less than 1%of the transmission delay,which meets the requirements of BDⅡ-CNAV information authentication.

BDSec:Security Authentication Protocol for BeiDou-Ⅱ Civil Navigation Message

Due to the lack of authentication mechanism in BeiDou navigation satellite system(BDS),BD-Ⅱ civil navigation message(BDⅡ-CNAV) are vulnerable to spoofing attack and replay attack.To solve this problem,we present a security authentication protocol,called as BDSec,which is designed by using China’s cryptography Shangyong Mima(SM) series algorithms,such as SM2/4/9 and Zu Chongzhi(ZUC)algorithm.In BDSec protocol,both of BDⅡ-CNAV and signature information are encrypted using the SM4 algorithm(Symmetric encryption mechanism).The encrypted result is used as the subject authentication information.BDSec protocol applies SM9 algorithm(Identity-based cryptography mechanism) to protect the integrity of the BDⅡ-CNAV,adopts the SM2 algorithm(Public key cryptosystem) to guarantee the confidentiality of the important session information,and uses the ZUC algorithm(Encryption and integrity algorithm) to verify the integrity of the message authentication serial number and initial information and the information in authentication initialization sub-protocol respectively.The results of the SVO logic reasoning and performance analysis show that BDSec protocol meets security requirements for the dual user identity authentication in BDS and can realize the security authentication of BDⅡ-CNAV.

Exploring the Applications of Digital Twin Technology in Enhancing Sustainability in Civil Engineering:A Review

With the advent of the big data era and the rise of Industrial Revolution 4.0,digital twins(DTs)have gained sig-nificant attention in various industries.DTs offer the opportunity to combine the physical and digital worlds and aid the digital transformation of the civil engineering industry.In this paper,605 documents obtained from the search werefirst analysed using CiteSpace for literature visualisation,and an author co-occurrence network,a keyword co-occurrence network,and a keyword clustering set were obtained.Next,through a literature review of 86 papers,this paper summarises the current status of DT application in civil engineering based on a review of the origins,concepts,and implementation techniques of DTs,and it introduces the application of DTs in the full project lifecycle.This study shows that DTs have great potential to address many of the challenges faced by civil engineering.In this regard,the paper also presents some thoughts on the future directions of DT research.

Exploration and Practice of the Digital Transformation and Upgrading Paths for Civil Engineering Majors

This article examines the pathway to digital transformation and upgrading in undergraduate institutions,using the civil engineering program at Chongqing Three Gorges University as a case study,focusing on six key areas:developing a high-quality digital talent training program for civil engineering;assembling diverse resources to create a digital,multi-scenario open learning environment that encompasses teaching,research,and practical training for civil engineering undergraduates;piloting innovative digital teaching models for civil engineering undergraduates;crafting a new model for digital resource provision,utilizing self-developed and specialized resources;devising assessment methods and ongoing improvement strategies based on the achievement of students’digital competencies;and devising a new,three-dimensional,multi-modal teaching evaluation system through intelligent data capture and analysis.

Analysis of Blood Lipids, Blood Glucose, Blood Uric Acid, and Blood Routine Test Results in Retired Employees of a Unit in the Civil Aviation System

Objective:To investigate and analyze the annual physical examination results of retired employees from a unit in the civil aviation system,focusing on blood lipids,blood glucose,blood uric acid,and blood routine results.The study aims to provide relevant references for formulating reasonable disease management measures for preventing and controlling hyperlipidemia,hyperuricemia,and other conditions in retired employees.Methods:The examination results of 231 participants were collected and analyzed.The participants were divided into four groups based on age:middle-aged group,young-old group,middle-old group,and old-old group.The blood test results were compared across these groups,and an assessment of atherosclerotic cardiovascular disease(ASCVD)risk levels was completed in conjunction with medical history.Blood test results were also compared by gender.Results:There were no significant statistical differences in blood test results when grouped by age.However,the prevalence of hyperuricemia was higher in males than in females,while the prevalence of hypercholesterolemia was higher in females than in males.The LDL-C target achievement rate was lower in the moderate-and-high-risk group as well as the very high-risk group as defined by ASCVD risk levels.Conclusion:Management of hyperuricemia and hyperlipidemia in retired employees(elderly patients)should be strengthened to reduce the risk of ASCVD events and alleviate the potential medical burden associated with disease progression.

基于MIDAS CIVIL的桥梁健康监测与评估

以福建省三明市某桥梁为分析案例,利用MIDAS CIVIL软件建立桥梁三维有限元分析模型,对桥梁在设计荷载下应变、挠度变化进行模拟仿真,分析出最不利点位。建立桥梁健康监测系统,采集桥梁实时数据,建立桥梁结构预警阈值,实现桥梁结构的损伤预警,保障桥梁结构健康安全,为桥梁养护提供参考。

Developments and Applications of Neutrosophic Theory in Civil Engineering Fields:A Review

Neutrosophic theory can effectively and reasonably express indeterminate,inconsistent,and incomplete information.Since Smarandache proposed the neutrosophic theory in 1998,neutrosophic theory and related research have been developed and applied to many important fields.Indeterminacy and fuzziness are one of the main research issues in the field of civil engineering.Therefore,the neutrosophic theory is very suitable for modeling and applications of civil engineering fields.This review paper mainly describes the recent developments and applications of neutrosophic theory in four important research areas of civil engineering:the neutrosophic decision-making theory and applied methods,the neutrosophic evaluation methods and applications of slope stability,the neutrosophic expressions and analyses of rock joint roughness coefficient,and the neutrosophic structural optimization methods and applications.In terms of these research achievements in the four areas of civil engineering,the neutrosophic theory demonstrates its advantages in dealing with the indeterminate and inconsistent issues in civil engineering and the effectiveness and practicability of existing applied methods.In the future work,the existing research results will be further improved and extended in civil engineering problems.In addition,the neutrosophic theory will also have better application prospects in other fields of civil engineering.

基于Midas Civil对结构设计竞赛理论分析及模型优化

以第十四届全国大学生结构设计竞赛命题为背景,使用Midas Civil软件对齐齐哈尔大学参赛作品进行理论方案设计。以江苏无锡华清大桥为参考依据进行方案设计,使用Midas Civil建立轴侧图、平面图、立面图以及剖面图,分别从结构的强度、刚度、稳定性进行分析并对模型进行优化。经过优化后的模型比参赛模型质量减少约100 g,仍然能够满足承载能力设计,这说明所提出的优化方案设计符合要求。

Influence of Ambient Temperature on the Thermal Safety of Fireworks Products in Civil Aviation Transportation

Fireworks products are energy-containing materials and are hazardous during production,storage,transportation,and use.By analyzing the range of civil aviation ground ambient temperature and civil aviation cabin ambient temperature in storage and ground operation as well as establishing a spontaneous combustion mathematical model for cylindrical fireworks products based on the spontaneous combustion theory,we identified the critical temperature for spontaneous combustion of a single spray and analyzed the thermal safety of fireworks products under the civil aviation ambient temperature by example to provide theoretical support for the feasibility study of transporting fireworks products by civil aviation.

基于Civil3D与Flac3D松散耦合的边坡稳定性分析方法

BIM技术是工程建模和信息化集成的有效手段,BIM的空间分析能力远超传统的二维模式,其在边坡工程中取得了广泛应用,但其稳定性分析环节,存在防护设计与仿真模拟脱节的问题。基于依托工程,采用文献调研、理论分析、软件开发和数值模拟方法,对BIM模型在边坡稳定性分析中的应用进行研究,实现了BIM模型构建、网格划分与稳定性分析的一体化应用:将Civil3D二次开发后与flac3D数值模拟软件结合,补足BIM在三维边坡稳定性方面的短板,同时弥补数值分析软件对复杂地质模型构建能力的不足,并采用多软件协同的转化方式进行对比,验证其在边坡工程中的适用性。结果显示:BIM软件建立的模型更加完善,并且在数值模拟环节同样具有高精准度,在实际工程中有较高的应用价值。

Midas Civil的关门江水道大桥钢栈桥结构设计

以关门江水道大桥钢栈桥为背景,运用Midas Civil软件建立钢栈桥三维有限元模型,分析在永久作用及可变作用下钢栈桥的强度、刚度和稳定性。结果表明:设计的钢栈桥满足规范要求。同时通过对关门江水道大桥钢栈桥结构设计思路进行研究总结,以期为类似工程施工提供参考。

Implementation Path of Green Vocational Education in Guangxi Under the Background of Rural Revitalization:Taking Civil Engineering Major as an Example

Green vocational education is a proactive response to the social objectives of sustainable development,building upon traditional vocational education.It serves as a crucial means to achieve sustainable development in both urban and rural areas.Green vocational education plays a significant role in cultivating diverse talents for rural revitalization.Therefore,there are corresponding pathways for implementing civil engineering talent training.This paper examines the current state of green vocational education development in Guangxi within the context of rural revitalization and proposes an implementation pathway based on civil engineering majors.These findings provide valuable insights towards realizing the integration and transformation of green vocational education.

On China’s Civil Law Codification and the Development of China’s Civil Law Scholarship

The development of the theoretical system of civil law scholarship and the codification of civil law are closely related and of promotional function to each other.The codification of civil law can promote the systematization of civil law scholarship,perfection of the value system,development and modernization of civil law studies,and the systematization of legal hermeneutics.The subjectivity of China’s civil law scholarship,i.e.,the notions of problem-orientation,nativeness,practice,the times and innovations,can be improved during China’s civil law codification.The codification of civil law can promote the development of a theoretical system of civil law scholarship with Chinese characteristics,including the development of diversified elements such as values,content,system,hermeneutics and methods of civil law.

Human Rights Implications of the Civil Code of the People's Republic of China

Putting the people first in human rights protection is the most distinctive feature of the outlook on human rights in contemporary China. The codification of the Civil Code of the People’s Republic of China reflects the people’s legislation for themselves, which is guided by the principle of putting the people first in its external system and internal values. Functionally, the Civil Code of the People’s Republic of China reflects the obligation of the country to protect human rights, constructs the framework relationship between the country and individual people, and perfects the mechanism for human rights protection. The continuous expansion of the types, contents, and functions of civil rights in the Civil Code of the People’s Republic of China is required by the broad scope of human rights, with an aim to realize a happy life for the people, the most important human rights, and protect people’s personal rights, property rights, and right to dignity through specific rules. The universal sharing of human rights requires the universality of the subjects of civil rights. The equal sharing of human rights requires the equality of forms of civil rights protection. Meanwhile, it further requires the substantive equality of civil rights protection. Attention is paid to protecting the rights and interests of specific groups in external and embedded ways.

基于Civil 3D部件编辑器的铁路BIM部件模型构建研究

为实现铁路线路结构参数化建模,基于Autodesk Civil 3D部件编辑器(SAC,Subassembly Composer)研究了自定义部件参数化模型的构建流程。利用部件编辑器可视化的设计流程和参数驱动图形交互的方法,针对不同的横断面形式,构建了单线有砟轨道部件、隧道部件和多级边坡部件参数化模型,并将参数化部件与三维地形曲面模型相融合,在三维可视环境下实现设计部件的工程量精确计算。通过SAC创建的部件具有设计参数更改方便、建模迅速、交互性强、形象直观的优点,是铁路BIM应用部件建模一种有效的方法。

Experimental Study on Magnetorheological Damper for Semi-Active Vibration Control of Civil Infrastructures

Magnetorheological (MR) fluid is a kind of smart material whose rheological properties can be rapidly varied in magnetic field. To make full use of the advantages of MR fluid to devices, a model of double ended, shear combined and valve typed MR damper is designed and manufactured, and the dynamic properties under sinusoidal excitations are experimentally studied. The experiment results show that the maximum damping force of the MR damper at the full magnetic intensity reaches about 20 kN while the maximum power required is less than 50 W, which predicts that the MR damper will be a powerful measurement for semi active vibration control of civil infrastructures.

Grey Incidence Analysis Applied to Civil Aircraft Customization Process

The airlines need to select the optional equipment according to their individual development demands and the manufacture′s standard specification manual when purchasing a new airplane.For this customization process,the selection theory is mainly based on qualitative analysis and quantitative analysis.The grey incidence analysis(GIA)is used for modeling,which evaluates the correlations between optional equipment and airlines′individual demands.Meanwhile,the customization demands are quantitatively processed as different weights in evaluation index system with analytical hierarchy process.Then,the value of grey incidence degree is obtained which shows whether the optional equipment is on the purchasing list or not.Finally,two airlines′customization demands are applied in the example of aircraft cabin′s seats,so two different purchasing priorities and equipment installation lists can be obtained.The results and comparisons verify the reasonable of modeling,which provides an objective scheme of aircraft equipment selection.

Prediction Approach to Life on Wing for Civil Aeroengine

To reduce engine maintenance cost and support safe operation, a prediction method of engine life on wing was proposed. This method is a kind of regression model which is a function of the condition monitoring and failure data. Key causes of engine removals were analyzed, and the life limit due to performance deterioration was predicted by proportional hazards model. Then the scheduled removal causes were considered as constraints of engine life to predicte the finai life on wing. Application of the proposed prediction method to the case of CF6-80C2A5 engine fleet in an airline proved its effectiveness.

基于Civil 3D+Revit+Dynamo的公路隧道参数化建模方法研究

针对公路隧道工程BIM建模标准化、精细化的需求,为解决建模过程中参数化程度低、联动性差等问题,依托济南市海螺峪隧道工程,应用Autodesk系列软件开展面向HCD工法的公路隧道参数化建模方法。阐述了HCD工法的施工理念,并以三维可视化技术模拟HCD工法施工过程;根据公路隧道工程施工特点,制定BIM基础数据文件的命名标准,并规范Excel及Revit族库数据的归类编码原则;应用Civil 3D软件通过“创建路线”得到高精度的隧道三维轴线,导入到Revit中,以Dynamo可视化编码程序实现隧道初期支护和二次衬砌构件三维模型的参数化创建和自动布设。研究成果有效解决了空间三维曲面建模难题,可为公路隧道以及其他带状分布工程BIM模型的参数化设计和快速高效创建提供技术参考。

Progress and trend on near-field problems in civil engineering

In the last twenty years, near-field problems became an important topic for both seismologists and civil engineers. The one aspect is to illuminate mechanisms of earthquakes and explain new phenomena. The another aspect is the ground motions, which are usually assigned by engineers as a type of input load for seismic design of structures, sometimes can control the final design results. The experiments, performance evaluations and other related aspects are all based on the specified type of load. As a result, many aspects related to civil engineering will be influenced by changes of the type of load, Hence, the characteristics of the load and the corresponding response of structures are desired for studying. In this paper, the state-of-the-art of near-field problems in civil engineering is comprehensively reviewed, which include inherent characteristics of near-field ground motions and influences of these ground motions on civil structures. The existing problems are pointed out and work needed to be further investigated in the future is suggested. It is believed that the information in this paper can be useful to advance the state of investigation on near-field problems.