Key technologies and applications of intelligent dispatching command for high-speed railway in China

Purpose–The intelligent Central Traffic Control(CTC)system plays a vital role in establishing an intelligent high-speed railway(HSR)system.As the core of HSR transportation command,the intelligent CTC system is a new HSR dispatching command system that integrates the widely used CTC in China with the practical service requirements of intelligent dispatching.This paper aims to propose key technologies and applications for intelligent dispatching command in HSR in China.Design/methodology/approach–This paper first briefly introduces the functions and configuration of the intelligent CTC system.Some new servers,terminals and interfaces are introduced,which are plan adjustment server/terminal,interface for automatic train operation(ATO),interface for Dynamic Monitoring System of Train Control Equipment(DMS),interface for Power Supervisory Control and Data Acquisition(PSCADA),interface for Disaster Monitoring,etc.Findings–The key technologies applied in the intelligent CTC system include automatic adjustment of train operation plans,safety control of train routes and commands,traffic information data platform,integrated simulation of traffic dispatching and ATO function.These technologies have been applied in the Beijing-Zhangjiakou HSR,which commenced operations at the end of 2019.Implementing these key intelligent functions has improved the train dispatching command capacity,ensured the safe operation of intelligent HSR,reduced the labor intensity of dispatching operators and enhanced the intelligence level of China’s dispatching system.Originality/value–This paper provides further challenges and research directions for the intelligent dispatching command of HSR.To achieve the objectives,new measures need to be conducted,including the development of advanced technologies for intelligent dispatching command,coping with new requirements with the development of China’s railway signaling system,the integration of traffic dispatching and train control and the application of AI and data-driven modeling and methods.

The History, Trend, Types, and Mitigation of Distributed Denial of Service Attacks

Over time, the world has transformed digitally and there is total dependence on the internet. Many more gadgets are continuously interconnected in the internet ecosystem. This fact has made the Internet a global information source for every being. Despite all this, attacker knowledge by cybercriminals has advanced and resulted in different attack methodologies on the internet and its data stores. This paper will discuss the origin and significance of Denial of Service (DoS) and Distributed Denial of Service (DDoS). These kinds of attacks remain the most effective methods used by the bad guys to cause substantial damage in terms of operational, reputational, and financial damage to organizations globally. These kinds of attacks have hindered network performance and availability. The victim’s network is flooded with massive illegal traffic hence, denying genuine traffic from passing through for authorized users. The paper will explore detection mechanisms, and mitigation techniques for this network threat.

Key technologies for medium and low voltage DC distribution system

Development of the medium and low voltage DC distribution system is of great significance to a regional transmission of electric energy,increasing a penetration rate of new energy,and enhancing a safety of the operation of the AC/DC interconnected grid.This paper first summarizes the medium and low voltage DC distribution system schemes and plans put forward by many countries,and then elaborate status of under-construction medium and low voltage DC distribution system project cases in China.Based on these project cases,this paper analyzes key issues involved in the medium and low voltage DC distribution system topologies,equipment,operation control technologies and DC fault protections,in order to provide theoretical and technical reference for future medium and low voltage DC distribution system-related projects.Finally,this paper combines a current China research status to summarize and give a prediction about the future research direction of medium and low voltage DC distribution system,which can provide reference for the research of medium and low voltage DC distribution system.

A Protocol to Develop Phenolic Emulsifiers Used in Micro-surface by Control Technology

The phenolic emulsifiers used in emulsified asphalt of micro-surfacing, which was the most important tools in the road maintenance, were investigated by control technology. Many factors influencing this reaction were studied and three kinds of phenolic emulsifiers were prepared without catalyst in ethanol. The performance was researched that 2-（{2-[2-（2-Amino-ethylamino）-ethylamino]-ethyl-amino}-methyl）-4- nonyl-phenol （abbreviated as TETA） could be used in micro-surface. With addition of 0.5 % demulsifier, the mixing time was extended to 120 seconds obviously, and the cohesion torque （60 min） was 2.8 N＊m, which satisfied the opening traffic time shorter than 1 h. The wet track abrasion （6 d） was lower than 807 g/m2, with interracial modifier added, but the load wheel was increased with interfacial modifier increasing. When the TETA： demulsifier： interracial modifier =3：1：3, excellent performance was obtained and the experimental results met the International Slurry Surfacing Association （ISSA） standard. The synthesis process of this emulsifier is simple and the performance used in micro-surface was excellent, so this kind of emulsifier could have a better application future.

Distributed Generation Application in the Rural Areas of West China

In this paper, at first the appearance background electricity grid in the rural areas of west China, and its meaning as well as the concept and structure of DG technologies are resented, and a DG technologies mode of development in the rural areas of west China is given. The development ideas and the future development direction of DG in are compared and summarized. At last, the significance of DG in future development of the rural areas of west China is prospected and some problems to be especially considered in the domestic research on DG technologies are put forward.

Design and Simulation of a Electrorheological(ER) Control High Voltage Power Supply

Few applications with electrorheological （ER） fluids have been found in industry. One reason is high voltage power supplies cannot meet the requirement for ER effect. In this paper, an ER control high voltage power supply for engineering application was designed which reduced power wastage by adopting soft switch technology; lessened its volume to satisfy micromation when adopting the planar transformer and improved its response character- istic by choosing an assistant discharging circuit. Simultaneously, a simulation analysis has been carried out. As results, the output voltage of this high voltage power supply is 5 kV, and the voltage can be continuously regulated and the voltage ripple is only 0. 7 %, so the requirement of stability is also achieved.

Application of Millimeter 3D Automatic Paving System in Highway Engineering Construction

In the construction of asphalt mixture pavement,there are many paving construction procedures,high requirements for machinery and personnel,unreasonable technology and so on.In this paper,the millimeter-scale 3D automatic paving control technology of asphalt mixture pavement is studied with an engineering example.From the analysis of the test results in the later stage of construction,it can be seen that the technology has achieved the goal of high precision paving,and the successful application of the technology provides valuable reference experience for similar asphalt concrete pavement construction in the future.

新形势下疾病预防控制信息化需求及应用场景分析

目的/意义探讨新兴信息技术催生的疾病预防控制信息化新需求、新场景,为信息技术与疾病预防控制体系现代化建设深度融合提供参考。方法/过程分析新兴信息技术在电子病历与疾病报告智能化解析、区域症候群监测、大规模疾病排查与辅助流行病学调查、多渠道监测预警、卫生应急状态下便携式单兵通信等多方面的探索性应用,阐释尚未形成体系的原因。结果/结论提出未来现代化疾病预防控制信息化发展建议,为提升公共卫生服务能力、创新业务变革提供技术支撑。

规模化养鸡场鸡粪“两段式”好氧堆肥工艺研究

好氧堆肥是鸡粪资源化利用的重要途径,它不仅能够解决鸡粪污染问题,还能够产生有机肥用于土壤改良,增强土壤肥力。但在工程应用上,传统的槽式堆肥发酵周期长,而罐式堆肥又常因物料含水率过高而难以启动,发酵效果不甚理想。本研究设计了一种“两段式”好氧堆肥工艺,通过初级发酵槽(第一阶段)发酵降低了物料含水率,从而实现了物料在立式发酵罐(第二阶段)内的快速腐熟。应用该工艺的示范工程已完成建设并稳定运行,对发酵完成后的物料进行腐熟度评价,发现物料的pH、含水率、有机质、蛔虫卵死亡率、种子发芽指数等评价指标均已满足要求,可作为肥料使用。

人工智能对企业收入分配的非线性影响——基于2007—2022年上市公司数据的检验

人工智能带来的新的技术变革促使企业收入分配格局发生变化。基于2007—2022年沪深A股上市公司数据,通过文本分析法对人工智能技术和应用进行科学测算,并就人工智能对企业利润与工资之间收入分配的影响展开分析。研究发现:人工智能技术和应用对企业利润与工资收入分配的影响呈“U”型,即在人工智能技术和应用发展的早期,利润与工资比率不断下降,差距逐渐缩小;但当人工智能技术和应用超过阈值时,利润不断吞噬工资,导致二者之间差距逐渐扩大。该结论在经历了替换被解释变量、分时段检验、剔除直辖市样本等一系列稳健性检验后依然成立。机制分析发现,人工智能技术和应用能够通过就业规模效应、就业结构效应和生产率效应间接影响企业利润与工资之间的分配。进一步研究发现,财务柔性能够正向调节人工智能与利润和工资之间收入分配的“U”型关系,对于财务柔性较高的企业来说,人工智能技术和应用与企业内部分配效应的“U”型关系较为明显,说明人工智能技术和应用对财务柔性较高的企业分配效应的影响相对更大。研究为在人工智能加速发展背景下提高员工工资、抑制企业间资本和劳动差距扩大提供了重要的政策建议。

“光储直柔”建筑配电系统应用研究

以某项目为例分析“光储直柔”在建筑物中的应用,并对“光储直柔”系统的应用场景、建筑直流配电系统的关注点及“光储直柔”系统关键设备进行阐述。

可靠性强化试验在配电控制器中的应用研究

可靠性强化试验通过施加高于产品正常工作条件的应力,快速激发产品潜在缺陷,揭示产品在设计、生产、工艺、元器件、原材料和结构等方面的缺陷和不足,通过优化设计或改进工艺等,最终实现提高产品可靠性的目的。本文从可靠性强化试验技术出发,详细介绍了可靠性强化试验目的、方案、环境条件和试验流程的制定,并结合可靠性强化试验在配电控制器上的实际应用,对可靠性强化试验的实际开展过程、故障问题分析和解决方案等进行了重点论述,可为同类产品的可靠性试验应用研究提供参考。

智能化分布式指挥与控制建设及关键技术应用

为厘清智能化分布式指挥与控制体系的发展态势及其关键技术,基于系统工程思维,通过收集开源情报、整合体系架构与建设进展等方式,对美军典型案例进行深入研究。同时,对其在特定作战场景中的应用进行阐释。结果表明,面向未来大规模、快节奏、多样化的战争,美军通过构建联合战术网、布局无人控制平台、研发智能决策辅助系统的方式增强作战指挥与控制的智能性。通过具体案例分析可知,分布式指挥与控制的智能化主要依赖边缘云、人工智能、无人自主系统及先进网络通信等关键技术。

绵、山羊性控精液的制作技术与应用研究进展

绵、山羊性控精液的生产与应用大大提高了群体扩繁的效率,推动了羊产业快速发展。自性控精液技术发展以来,研究者们虽取得了一定的科研成果,但在羊生产中的应用仍然十分有限。本文系统综述了羊性控精液分离技术的发展及不同因素(包括品种、个体差异、稀释液配方、冷冻程序、饲养管理)对绵、山羊性控精液制作的影响,并阐述了羊性控精液的推广应用及前景展望,为绵、山羊性控精液高效分选、输精技术的研发及推广应用提供参考。

基于可搜索加密技术的分布式数据库安全访问多级控制算法

为解决分布式数据库中明文传输容易被篡改的安全隐患,提出了一种基于可搜索加密技术的分布式数据库安全访问多级控制算法。该算法将授权用户按照安全级别分组,并采用TF-IDF(Tem Frequency-Inverse Document Frequency)算法计算明文关键词的权重,然后利用AES(Advanced Encryption Standard)算法和轮函数生成密文的密钥,使用矩阵函数和逆矩阵函数对明文进行加密,并将加密结果上传至主服务器。同时,采用Build Index算法生成密文的索引,根据用户安全级别相关属性信息审查用户是否具有访问密文的权限,审查通过后用户即可发出密文数量与关键词搜索请求,服务器将密文送回用户端并使用对称密钥方式解密,实现访问多级控制。实验结果表明,该方法在加密、解密过程中用时较短,且安全访问控制性能良好。

压裂后起工具段过程中的相关井控技术探讨

随着我国石油天然气勘探开发工作的快速发展,井控工作受到广泛重视,在石油天然气资源的勘探环节、开发环节等起到至关重要的作用,但是由于在实际钻井生产期间,可能会出现压裂后起工具段的井控问题,严重影响施工工作的效果。基于此,本文分析压裂后起工具段过程中的井控技术,提出技术应用的措施和注意事项,旨在为增强技术应用的效果提供助力。

PLC技术在机械电气控制装置中的应用

在机械电气控制装置中,可编程逻辑控制器(PLC)技术扮演着关键角色,其应用类型包括集散型控制系统(DCS)和现场总线控制系统(FCS)。PLC技术在机械电气控制中的作用体现在实现机电一体化、提升抗干扰能力、控制功能的实现、自我检测、简化操作过程以及故障的诊断与处理等方面。具体应用策略包括在设备安全检测中的应用、空气压缩器控制、机械控制、捻线机控制等。

基于迁移学习的嵌入式实时系统缺陷研究

为了减少环境变化对软件缺陷评估的影响,提出了一种基于迁移学习的嵌入式实时控制系统软件缺陷评估方法。首先,选择缺陷软件测量指标;在此基础上,利用特征聚类技术将相关的索引特征划分为同一个聚类;然后,根据两项间特征的分布相似性,找到相关特征,去除分布差异较大的特征;最后,从源项目中选择高质量的特征,构建训练数据集,通过权重调整,从源项目中选择更好的评价数据,实现对软件缺陷的准确评价。映射结果目标明确,设计方法的评价结果的错误率在8.7%以内,具有良好的评价效果。