Distance-Measuring Technology Using LD for Auto Anti-Collision

Auto anti-collision technology is one of the main research subjects of automobiles’ safety technology. Aiming at the key technology of Auto anti-collision, measuring the distance from obstacles, based on the theory of phase laser distance ranging, Laser Diode (LD) distance-measuring system for auto anti-collision has been developed to solve the problem of on-line measuring distance technology in middle to long distance utilizing the good characteristics of LD when modulating its optical intensity and adopting typical kinds of filter techniques in this paper. By theoretical analysis, adopting typical kinds of filter techniques can reduce the interference of strong light, so distance-measuring range can be 0.5–100 m in daytime or 1–200 m at night. And more, from theoretical analysis and experiment result, it can guarantee the high measuring resolution which can be less than 24.5 mm, utilizing the method of two Laser Diode optical intensity modulating wavelength and complimenting precise calibration and revision. The idea of LD distance-measuring technology is novel and feasible and this technology can be applied in Auto anti-collision. Key words laser diode - phase laser distance ranging - filter techniques - auto anti-collision CLC number TH 161 Foundation item: Supported by the National Natural Science Foundation of China (59675080, 59805006) and Wuhan Chenguang Foundation (20025001001)Biography: Zhang Xin-bao (1965-), male, Associate professor, research direction: precise mechanism and instrument.

A Novel Anti-Collision Algorithm for Large Scale of UHF RFID Tags Access Systems

When the radio frequency identification(RFID)system inventories multiple tags,the recognition rate will be seriously affected due to collisions.Based on the existing dynamic frame slotted Aloha(DFSA)algorithm,a sub-frame observation and cyclic redundancy check(CRC)grouping combined dynamic framed slotted Aloha(SUBF-CGDFSA)algorithm is proposed.The algorithm combines the precise estimation method of the quantity of large-scale tags,the large-scale tags grouping mechanism based on CRC pseudo-randomcharacteristics,and the Aloha anti-collision optimization mechanism based on sub-frame observation.By grouping tags and sequentially identifying themwithin subframes,it accurately estimates the number of remaining tags and optimizes frame length accordingly to improve efficiency in large-scale RFID systems.Simulation outcomes demonstrate that this proposed algorithmcan effectively break through the system throughput bottleneck of 36.8%,which is up to 30%higher than the existing DFSA standard scheme,and has more significant advantages,which is suitable for application in largescale RFID tags scenarios.

高职资源勘查类专业Auto CAD课程产学融合教学模式探索与构建

以资源勘查类专业的Auto CAD课程教学为例,探讨如何有效地进行教学管理和完成教学设计,以适应产学融合、培养高质量的技术型人才的需求。通过针对性的课程设计,融入资源勘查类专业的知识点并引导学生运用知识点,能在一定程度上提高学生的学习兴趣,有利于实现以需求为导向的教学目标,使产学互动无缝衔接。

Digital CEOs in Digital Enterprises:Automating,Augmenting,and Parallel in Metaverse/CPSS/TAOs

BIG models or foundation models are rapidly emerging as a key force in advancing intelligent societies[1]–[3]Their significance stems not only from their exceptional ability to process complex data and simulate advanced cognitive functions,but also from their potential to drive innovation across various industries.

基于智慧职教平台的混合式教学模式课程设计与教学实践研究——以Auto CAD绘图课程为例

传统Auto CAD绘图课程的教学模式是老师不断输出知识和操作演示,学生被动接受和模仿学习,学生未能真正将知识进行内化,也没有思考后的输出和应用。该方式教学内容与企业需求脱轨,学生只能完成课堂布置的练习及课后作业,缺乏学习探索的主动性。据此,将现代信息化教学手段与普通线下教学方式进行糅合,并在此基础上进行课程内容重构、教学过程设计和多元化评价体系等,以求达到更好的教学效果,培养出企业需要、社会满意的学生。

Automated Actuarial Data Analytics-Based Inflation Adjusted Frequency Severity Loss Reserving Model

In this paper, the Automated Actuarial Loss Reserving Model is developed and extended using machine learning. The traditional actuarial reserving techniques are no longer compatible with the increase in technological advancement currently at hand. As a result, the development of the alternative Artificial Intelligence Based Automated Actuarial Loss Reserving Methodology which captures diverse risk profiles for various policyholders through augmenting the Micro Finance services, Auto Insurance Services and Both Services lines of business on the same platform through the computation of the Comprehensive Automated Actuarial Loss Reserves (CAALR) has been implemented in this paper. The introduction of the four further types of actuarial loss reserves to those existing in the actuarial literature seems to significantly reduce lapse rates, reduce the reinsurance costs as well as expenses and outgo. As a matter of consequence, this helps to bring together a combination of new and existing policyholders in the insurance company. The frequency severity models have been extended in this paper using ten machine learning algorithms which ultimately leads to the derivation of the proposed machine learning-based actuarial loss reserving model which remarkably performed well when compared to the traditional chain ladder actuarial reserving method using simulated data.

A Tale of Two Continents-An Autobiography

On 14th September 2023,we were gathered in a Beijing conference hall to exchange views with the leaders of the Chinese Association for International Understanding.We had been introduced about the Association by researcher Zhang Yaowu during our field trips.However,when we met Ai Ping,I had no idea that we were talking with the author of"A Tale of Two Continents:An Autobiography".In receiving his signed book,I realized that the speaker was the current Vice-President of the Chinese Association for International Understanding and a Deputy Minister and an Ambassador Extraordinary and Plenipotentiary of China to Ethiopia.

Application of Ship Maneuvering Simulator's Technology on Research of Vessels Automatic Anti-Collision

In this paper, the authors make a summary of current situation of research on the Auto Anti-Collision, briefly introduce the components and functions of the NSACA Simulation Platform and bring forward the project to realize the simulation of an Automatic Anti-Collision control, based on the NSACA Simulation Platform. Finally give typical examples from a great deal of simulating tests and analyze them.

新工科背景下化工制图与Auto CAD的过程性教学改革

化工制图与Auto CAD化学工程与工艺专业的一门核心课程,具有较强的理论性和实践性,通过讲授工程制图的基本知识、化工设备图样、化工工艺图样,让学生掌握识图、阅图及绘图的基本能力,课程的教学质量将会直接影响到后续专业课学习、毕业设计质量及化工设计大赛的完成情况等。笔者结合多年的教学积累和教学反思,介绍了化工制图与Auto CAD在教学过程中存在的一些问题,阐述在教学中过程性改革的具体措施。通过改进教学模式,优化过程性评价,培养学生独立思考能力和动手实践能力,为化工企业输送应用型人才。

Auto CAD二次开发在幕墙设计中的应用

随着建筑幕墙行业的快速发展,幕墙设计工作也越来越复杂.幕墙设计不仅在招投标阶段发挥重要作用,更在工程施工过程中给予大量的技术支持,导致幕墙设计人员肩上的担子越来越重.本文通过研究Auto CAD二次开发来解决复杂幕墙设计问题,减少重复机械操作,提高幕墙设计人员的工作效率.

基于Auto CAD的通风管道系统的优化

当前通风管道系统的尺寸优化主要由人工完成,效率较低,针对该问题,分析了通风管道系统的结构特性,选用了B树作为基本数据结构,根据通风管道中线图及其连通特性建立管路构建方法。依据通风管道中风速、风量与截面积的关系,计算出各个管道的理论截面积,确定了管道截面尺寸优化策略。最后使用上述方法针对某通风管道进行了优化设计。

基于AUTO Civil 3D的水利工程勘察设计

本文通过无人机技术和数字高程模型,采集水库工程的地形和地貌数据;将原始工程资料、采集的地貌数据以及地形数据,输入至AUTO Civil 3D软件中,生成水库工程地形曲面模型和地质三维实体模型,完成模型颜色渲染,进行水库工程勘察设计。这种基于AUTO Civil 3D的水利工程勘察方法测试结果表明,该方法能够有效完成水利工程地质模型的生成,呈现地质信息的实体结果;模型的构建精度较高,可有效完成航道疏浚时河底清淤勘察设计。

基于AutoCAD.NET的地籍数据库宗地要素重叠检查算法研究

【目的】为解决地籍数据建库过程中出现宗地要素重叠的问题,提高地籍空间数据的质量,保证数据的拓扑空间一致性,设计出一种提取重叠宗地要素的自动化检查工具。【方法】根据空间拓扑关系九交模型对要素间的重叠类型进行识别,在AutoCAD平台上借助AutoCAD.NET的布尔运算机制实现要素重叠的自动提取。【结果】自动化检查工具实现了地籍空间数据中各宗地要素之间的重叠检查,可直接对数据进行处理,生成定位重叠多变形的DWG文件。【结论】基于AutoCAD.NET开发的自动化检查工具能够准确地检查出存在重叠的多边形,避免了人工检查工作量大且容易出错的缺点,提高了地籍空间数据的质量和成图效率。

Injuries Associated with Auto-Tricycle Crashes in an African City: Incidence and Pattern

Purpose: The aim of this study was to determine the incidence and pattern of injuries resulting from auto-tricycle crashes among patients in a tertiary referral centre in Ghana. Methods: Data were retrospectively extracted from hospital records of patients who got involved in auto-tricycle crashes and presented to the Accident and Emergency Centre of the Komfo Anokye Teaching Hospital (KATH), over a one-year period using a structured questionnaire. The gathered data were then entered into an electronic database and then analysed with SPSS version 20.0. Results: The incidence of injury following auto-tricycle crashes over the one-year period was 5.9% (95% CI: 4.9% - 7.0%) with a case fatality rate (FR) of 3.8% (95% CI: 1.3% - 8.7%). All the mortalities resulted from head and neck injuries and none of the patients involved wore a crash helmet. Only 5% of those studied wore crash helmets and were all drivers. Closed fractures accounted for 58% of the injuries, followed by open fractures, 28%. The most commonly fractured bones were the tibia/fibula, followed by the femur and then radius/ulna. The most common mechanism of injury was auto-tricycle toppling over (29%). Passengers were the most injured (48%), followed by drivers (37%) and pedestrians (15%). Most (72%) injuries among participants involved a single body part. On the injury severity scale, most (61%) of patients had minor trauma and 38% had major trauma. Conclusion: Auto-tricycle crashes account for 5.9% of injuries at the study site with a case fatality rate of 3.8%. Passengers had a higher injury rate (48%) than drivers (37%). Fractures of the tibia/fibula were most commonly associated with auto-tricycle crashes. Injuries to the head and neck were responsible for the deaths in the study participants and non-use of a crash helmet was associated with mortalities.

The Condyloma Acuminatum’s Recurrence Can Be Reduced by Lesional Auto-Transplantation

Background: Condyloma acuminatum (CA), also known as a genital wart (GW), is a sexually transmitted disease caused by human papillomavirus (HPV). HPV lesions, recurrence tendency, and risk of malignant formation are primarily dependent on the person’s immunity level. GW recurrence is a major challenge in CA treatment. The aim of this study was to explore how lesional auto-transplantation (LT) can be used to treat CA and decrease its recurrence. Methods: We treated CA through the preparation and implantation of tissue from nine CA patients in our dermatology clinic. Transplantation of small pieces of HPV lesions to the subcutaneous fat of the inguinal region was carried out with the help of a simple surgical method under local anesthesia. Patients were followed up for six to eight months. We searched PubMed and the Web of Science for treatment options for CA to compare our treatment method recurrence rate with existing treatment options. Results: During three months of follow-up, seven patients experienced no recurrence of condyloma lesions, while two patients experienced recurrence of small lesions of condyloma acuminatum. The recurrence rate of CA once treated by auto-transplantation was relatively low compared to other CA treatment options. Conclusions: Transplantation of HPV lesions to the inguinal area reduces the recurrence rate in sexually active individuals. The 2/9 recurrence after implantation could be due to poor hygiene, sexual relationships or immune factors.

基于Auto bank的某水库大坝渗流安全评价

以富水水库为例,依托达西定律和渗流理论基础,并结合Auto bank有限元软件分析了水库在正常高水位、设计洪水位、校核洪水位下坝体及坝基的渗流状况,计算结果表明水库日渗漏量远小于允许日渗漏量,水库渗漏量满足规范要求。大坝各工况最大渗透坡降均小于规范允许值,渗透变形满足规范要求。左坝肩存绕渗现象,建议加强监测。

Auto CAD在陶瓷产品设计三视图中的应用研究

Auto CAD制图的应用为陶瓷产品设计提供了有力帮助,能显著提升陶瓷产品的观赏性、艺术性,同时使陶瓷产品保持其应有的实用性。对此,本文针对Auto CAD在陶瓷产品设计三视图中的应用价值展开探讨,对于Auto CAD的应用原理进行研究,而后对Auto CAD在陶瓷产品设计三视图中的具体应用进行分析,对于如何推动这一制图软件的深度应用提出一些建议,希望能为相关从业者在Auto CAD的应用方面提供一些借鉴。

一种基于AutoLISP的地形图斜坡类要素处理程序的设计与实现

在大比例尺地形图编辑中存在大量的依比例斜坡类符号要素,包括依比例斜坡、干堤、加固岸、路堤、路堑等,该类符号是一种复合性符号,由坡顶线和坡面两部分组成,坡顶线由坡顶母线和长短齿符号组成,其中长齿长度和坡面宽度一致且垂直于坡顶母线,该符号表示复杂,编辑工作较为费时费力。利用AutoLISP语言开发斜坡类符号要素处理程序,实现符号长齿自动延伸,可大大提高该类符号编辑工作效率,提升制图表达效果。

An Adaptive Tag Anti-Collision Protocol in RFID Wireless Systems

A novel anti-collision algorithm in RFID wireless network is proposed.As it is put forward on the basis of collision tree(CT)and improved collision tree(lCT) anti-collision protocols,we call it adaptive collision tree protocol(ACT).The main novelty of this paper is that the AD strategy is introduced and used in ACT to decrease collisions and improve the tag system throughput.AD strategy means that query strings will divide into two or four branches adaptively according to the label quantity.This scheme can decrease both depth of query and collision timeslots,and avoid producing too much idle timeslots at the same time.Both theoretical analysis and simulation results indicate that the novel proposed anticollision protocol ACT outperforms the previous CT and ICT protocols in term of time complexity,system throughput,and communication complexity.

Design of Anti-Collision Integrated Security Mechanism Based on Chaotic Sequence in UHF RFID System

Collision and security issues are considered as barriers to RFID applications.In this paper,a parallelizable anti-collision based on chaotic sequence combined dynamic frame slotted aloha to build a high-efficiency RFID system is proposed.In the tags parallelizable identification,we design a Discrete Markov process to analyze the success identification rate.Then a mutual authentication security protocol merging chaotic anti-collision is presented.The theoretical analysis and simulation results show that the proposed identification scheme has less than 45.1%of the identification time slots compared with the OVSF-system when the length of the chaos sequence is 31.The success identification rate of the proposed chaotic anti-collision can achieve 63%when the number of the tag is100.We test the energy consumption of the presented authentication protocol,which can simultaneously solve the anti-collision and security of the UHF RFID system.