检索结果-南通市图书馆

Comparative study on bearing mechanism and design parameters of confined concrete arch joints in deep soft rock roadway

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2019年第4期6卷 493-504页

作者： Wei Lu Qi Wang Bei Jiang Shuo Xu bohong liu Peng Zhang Zhenhua Jiang Research Center of Geotechnical and Structural Engineering Shandong UniversityJinan 250061China Key Laboratory for Geo-mechanics and Deep Underground Engineering China University of Mining and TechnologyBeijingChina School of Civil Engineering and Architecture University of JinanJinan 250022China

Square confined concrete arch is increasingly used in deep soft rock roadway support because of its advantages of high strength and construction ***,the design of confined concrete arch in underground engineering still remains in experience-based method and lacks quantitative *** a connecting component between arch sections,the connection joints have an important influence on the internal force distribution and failure mechanism of support ***,a reasonable design of arch joints is the premise of rational support *** Liangjia Coal Mine,a typical deep soft rock mine in China,as research background,this paper fully compared the most widely used joint types of confined concrete arch as analytical objects:flange joints and casing *** main failure modes of these two kinds of joints under bending moment are *** and numerical tests are carried out to study the mechanical characteristics of *** on the M-θ curve,the influence law of different design parameters is analyzed,and the design principles of joints are *** research results could provide a theoretical basis for the design and application of confined concrete arch in related projects.

关键词： Confined concrete arch Soft rock roadway Bearing mechanism Failure mode Casing joint

Automatic Driving Operation Strategy of Urban Rail Train Based on Improved DQN Algorithm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal on Artificial Intelligence 2023年第1期5卷 113-129页

作者： Tian Lu bohong liu School of Automation and Electrical Engineering Lanzhou Jiaotong UniversityLanzhou730070China

To realize a better automatic train driving operation control strategy for urban rail trains,an automatic train driving method with improved DQN algorithm(classical deep reinforcement learning algorithm)is proposed as a research ***,the train control model is established by considering the train operation ***,the dueling network and DDQN ideas are introduced to prevent the value function overestimation ***,the priority experience playback and“restricted speed arrival time”are used to reduce the useless experience *** experiments are carried out to verify the train operation strategy method by simulating the actual line *** the experimental results,the train operation meets the ATO requirements,the energy consumption is 15.75%more energy-efficient than the actual operation,and the algorithm convergence speed is improved by about 37%.The improved DQN method not only enhances the efficiency of the algorithm but also forms a more effective operation strategy than the actual operation,thereby contributing meaningfully to the advancement of automatic train operation intelligence.

关键词： DQN algorithm automatic train operation(ATO) operation strategy urban rail train

Tianjin Normal University Establishes Women's Studies Center

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Women of China 1994年第7期 22-23页

作者： liu bohong MAN SUJIE

IN July, 1993, an international seminar titled "Chinese Women and Development—Status, Health and Employment" was sponsored by the Women’s Studies Center at Tianjin Normal University. More than 100 international and domestic specialists and workers who deal with women’s issues attended. At the conference, the Women’s Research Institute of the All-China Women’s Federation disclosed the results of an investigation about the status of women in China, which was launched in the early 1990s on a nationwide scale. The results showed that China’s economic reform has greatly affected women. As a result, many researchers who began their research by considering China’s present economic situation, tried to determine the influences the

关键词： Tianjin Normal University Establishes Women’s Studies Center

＇Let the World Fall in Love with Made-m-China Products＇ Efforts, Pursuits of Women Entrepreneurs in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Women of China 2017年第6期 72-73页

作者： liu bohong China Women＇s Universit

Pursuits During prime time on CCTV （China Central Television）, my favorite advertisement has renowned Chinese entrepreneur Dong Mingzhu saying, ＂Let the world fall in love with made-in-China products.＂ Every time I hear her speaking that sentence, in a calm, firm and confident tone, 1 feel excited, hopeful and I really respect her.

关键词：英语阅读理解中国女企业家

基于ASP-SAC算法的列车自动驾驶速度控制

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

铁道科学与工程学报 2024年第7期21卷 2637-2648页

作者：刘伯鸿卢田兰州交通大学自动化与电气工程学院甘肃兰州730070

随着经济建设的绿色转型以及人工智能的快速发展,城市轨道交通已成为居民日常出行的重要方式,在保障安全性、高效性和准点性的前提下,列车运行的节能性和舒适性需求也越来越被关注。合理的运行策略能够有效实现多种目标需求下的列车自... 详细信息

随着经济建设的绿色转型以及人工智能的快速发展,城市轨道交通已成为居民日常出行的重要方式,在保障安全性、高效性和准点性的前提下,列车运行的节能性和舒适性需求也越来越被关注。合理的运行策略能够有效实现多种目标需求下的列车自动驾驶速度控制,强化学习作为一种智能决策方法,能够有效解决这一控制问题。首先,通过综合分析技术、安全性和乘客体验等方面的因素,基于专家经验动作划分和状态信息熵将软演员-评论家(SAC)改进为动作状态经验优先软演员-评论家(ASP-SAC)方法,用于研究列车自动驾驶速度控制问题。其次,将问题马尔可夫形式化,搭建了列车运行环境,确定了状态空间、动作空间以及基于目标控制的奖励函数。最后,以北京地铁亦庄线的一段区间数据为例进行试验,对ASP-SAC方法进行验证并与其他一些算法在相同环境下进行性能优劣比较。研究结果表明:该方法对于多目标控制需求下的列车自动驾驶速度控制问题具有可行性,与未改进前相比算法效率提高22.73%,与PPO算法相比提高29.17%,改进效果良好。同时,列车运行时在安全性、舒适性无误的情况下,准时性、精确性和节能性都强于SAC、DQN、PPO以及PID算法,其中能耗分别减少3.64%、5.62%、4.38%、7.35%,控制效果良好。此外,该方法亦具备鲁棒性,在列车自动驾驶速度控制方面具有一定的优越性和可参考性。

关键词：列车自动驾驶多目标控制强化学习 ASP-SAC算法速度控制

Analyzing Student Behavior in Online Programming Courses

在线全文

学校读者我要写书评

暂无评论

计算机教育 2018年第12期 48-56页

作者： Xinyu You bohong liu Menghua Cao Tao Wang Yue Yu Gang Yin Computer Science College National University of Defense Technology

Rather than maintaining the classic teaching approach, a growing number of schools use the blended learning system in higher education. The traditional method of teaching focuses on the result of students' progress. However, many student activities are recorded by an online programming learning platform at present. In this paper, we focus on student behavior when completing an online open-ended programming task. First, we conduct statistical analysis to examine student behavior on the basis of test times and completed time. By combining these two factors, we then classify student behavior into four types by using k-means algorithm. The results are useful for teachers to enhance their understanding of student learning and for students to know their learning style in depth. The findings are also valuable to re-design the learning platform.

关键词： educational data mining learning analysis student behavior online programming blended learning environment

在线全文

学校读者我要写书评

暂无评论

激光散斑图像数字水印防伪检测技术

激光杂志 2020年第4期41卷 106-110页

作者：刘勃宏西安文理学院西安710065

针对基于DSP的数字水印防伪检测技术,数字水印图像对比精度低,抗几何失真效果差,无法满足数字水印防伪高精度检测要求的问题,提出激光散斑图像数字水印防伪检测技术。通过图像分割、离散余弦变换、数据提取、图像合并等过程在嵌入水印... 详细信息

针对基于DSP的数字水印防伪检测技术,数字水印图像对比精度低,抗几何失真效果差,无法满足数字水印防伪高精度检测要求的问题,提出激光散斑图像数字水印防伪检测技术。通过图像分割、离散余弦变换、数据提取、图像合并等过程在嵌入水印的载体图像内提取完整数字水印;利用激光散斑成像系统分别采集原数字水印与提取得到的数字水印的激光散斑图像,对比两张激光散斑图像中极值点位置,得到数字水印激光散斑图像实际位移量,对比实际位移量与设定的位移阈值,完成数字水印防伪检测。实验结果表明,所提技术能够对抗几何失真,数字水印提取性能高,在确保高防伪检测精度的同时,相对于对比检测技术的峰值信噪比提升5.43 dB,平均检测时间降低0.54 s。

关键词：激光散斑图像数字水印防伪检测提取极值点位移

“Beijing + 10” in China-Commemorating the 10th Anniversary of the UN Fourth World Conference on Women

在线全文

学校读者我要写书评

暂无评论

“Beijing + 10” in China-Commemorating the 10th Anniversary...

基于数字媒体DSP的远程网络视频监控系统设计

北京论坛（2004）文明的和谐与共同繁荣

作者： liu bohong Deputy Director of Women’s Studies Institute of the ACWF

The global strategy for the acceleration of gender equality during the end of the 20th and the beginning of the 21st century was jointly constituted by 35,000 representatives attending the UN Fourth World Conference on Women (FWCW) convened successfully in Beijing from August to September in 1995. The "Beijing Declaration" and "Platform for Action" passed at the Conference have been historical grandeur commitment of governments worldwide for the promotion of sustainable development and social justice. From then on, "platform for action", has become one of the most frequently used phrases in the world when mentioning improving women’s status and empowerment. And, it has been a goal and a guideline for the advancing of gender equality, development and peace.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

现代电子技术 2020年第4期43卷 90-93页

作者：刘勃宏西安文理学院

针对传统视频监控系统存在视频流畅性较低、监控数据传输成功率低、误码率高等问题,提出基于数字媒体DSP的远程网络视频监控系统。系统硬件设计中,上位机采用LabVIEW编程实现,用于控制摄像支撑设备转动、镜头参数调整以及视频数据播放... 详细信息

针对传统视频监控系统存在视频流畅性较低、监控数据传输成功率低、误码率高等问题,提出基于数字媒体DSP的远程网络视频监控系统。系统硬件设计中,上位机采用LabVIEW编程实现,用于控制摄像支撑设备转动、镜头参数调整以及视频数据播放与远程显示控制等功能;下位机使用数字媒体DSP为核心处理器,建立含有视频数据采集输入、传输以及摄像支撑设备控制等模块。系统软件设计中,详细介绍了远程网络视频监控系统中视频图像运动目标检测算法。实验结果表明,所提系统能有效实现流畅清晰的视频远程网络传输,视频数据传输成功率可达到98.467%,误码率最低为0.006 35%,能够满足实际远程网络视频监控的需要。

关键词：视频监控系统远程网络数字媒体DSP 系统设计目标检测实验结果