船舶小组立装焊作业单元CPS系统研究与应用

当前船厂小组立装焊作业过程存在作业任务信息无法直接传递至现场,现场实际执行的状态信息无法及时反馈等问题,导致装焊作业混乱、装焊效率低下.为了解决上述问题,针对船舶小组立装焊作业单元进行研究,构建基于信息物理融合(CPS)的智能制造系统.首先分析了小组立装焊作业流程;然后梳理了装焊作业任务数据,构建了小组立装焊作业数据模型,并在此基础上,完成了基于物联网的CPS框架设计以及系统功能开发,实现了对装焊作业过程的有效监控;最后将该系统应用于某船厂小组立装焊现场,有效规范了装焊作业过程,提高了装焊效率.     

人脸识别系统在重庆轨道交通公安系统中的应用

结合重庆轨道交通公安分局人脸识别系统建设的情况,分析了基于视频流的人脸识别系统在重庆轨道交通中的应用,重点阐述了人脸识别系统在重庆轨道交通公安系统中的基本构成,并详细分析了人脸识别系统在重庆轨道交通公安系统中的重要作用.     

共享自动驾驶汽车经营策略优化分析

研究共享自动驾驶汽车(SAV)与普通汽车共存背景下，SAV公司如何根据运营目标优化经营策略并影响通勤者出行方式选择. 假设高速公路上存在一定数量的独驾通勤者，无车通勤者在SAV和地铁之间进行权衡. 分析固定需求和弹性需求下，SAV公司追求系统总成本最小或系统净收益最大和利润最大时的最优经营策略，即SAV票价和容量，进而得到均衡时模式划分情况，SAV最优发车数，系统总成本或系统净收益，以及公司利润等指标. 算例对均衡结果进一步验证发现，SAV公司垄断经营会收取较高的票价，提供容量较小的车型. 在系统最优情形下，SAV公司无法获得正利润，需要政府补贴运营.     

基于群决策层次理论的预防性养护方案决策

基于高速公路预防性养护决策方案选择的特性,使用群决策理论的层次分析法,通过对决策组成员意见的集合,得到了各成员动态权重,减少主观误差,提高决策方案结果的客观可靠性。通过案例,将措施费用、行车特征、技术因素、施工因素等作为目标层,对4种备选方案进行分析,得出最佳措施。案例结果证明群决策方法的有效性与可靠性,为选择合理的养护措施提供参考。     

CT reconstruction with priori MRI images through multi-group datasets expansion

Computed tomography (CT) reconstruction with a well-registered priori magnetic resonance imaging (MRI) image can improve reconstruction results with low-dose CT, because well-registered CT and MRI images have similar structures. However, in clinical settings, the CT image of patients does not always match the priori MRI image because of breathing and movement of patients during CT scanning. To improve the image quality in this case, multi-group datasets expansion is proposed in this paper. In our method, multi-group CT-MRI datasets are formed by expanding CT-MRI datasets. These expanded datasets can also be used by most existing CT-MRI algorithms and improve the reconstructed image quality when the CT image of a patient is not registered with the priori MRI image. In the experiments, we evaluate the performance of the algorithm by using multi-group CT-MRI datasets in several unregistered situations. Experiments show that when the CT and priori MRI images are not registered, the reconstruction results of using multi-group dataset expansion are better than those obtained without using the expansion.     

党的建设科学化:涵义与意义探析

党的建设科学化,包含“科学”、“科学化”和“党的建设科学化”三个层次的分析性内容,核心是认识和把握党的建设的规律,实质是党的建设的规律化、系统化、模式化和开放化.从时代背景上看,党的建设科学化是中国共产党面对世情、国情、党情的变化而提出的优化自身建设的新命题,具有强烈的问题意识.从革命走向执政、从计划走向市场,从封闭走向开放,对党的建设提出了一系列严峻的挑战和全新的课题,必须从深刻把握现代政党运动的一般发展规律和马克思主义执政党建设的特殊规律的高度上不断推进科学建党,这是一个从必然王国走向自由王国的过程.     

防止高校图书馆电子阅览室功能弱化的对策

高校网络的发展和计算机的普及,弱化了电子阅览室的功能,而高校图书馆信息资源建设和读者服务与用户需求存在着差距,所以高校图书馆应加强特色信息数据库建设,加强区域合作,开展特色服务,是电子阅览室可持续发展的对策。     

Key technologies of ship remote control system in inland waterways under ship-shore cooperation conditions北大核心CSCD

［Objective ］ To meet the requirements of remotely controlling ship in curved, narrow and crowded inland waterways, this paper proposes an approach that consists of CNN-based algorithms and knowledge based models under ship-shore cooperation conditions. ［Method］On the basis of analyzing the characteristics of ship-shore cooperation, the proposed approach realizes autonomous perception of the environment with visual simulation at the core and navigation decision-making control based on deep reinforcement learning, and finally constructs an artificial intelligence system composed of image deep learning processing, navigation situation cognition, route steady-state control and other functions. Remote control and short-time autonomous navigation of operating ships are realized under inland waterway conditions, and remote control of container ships and ferries is carried out. ［Results］The proposed approach is capable of replacing manual work by remote orders or independent decision-making, as well as realizing independent obstacle avoidance, with a consistent deviation of less than 20 meters. ［Conclusions］The developed prototype system carries out the remote control operation demonstration of the above ship types in such waterways as the Changhu Canal Shenzhou line and the Yangtze River, proving that a complete set of algorithms with a CNN and reinforcement learning at the core can independently extract key navigation information, construct obstacle avoidance and control awareness, and lay the foundation for inland river intelligent navigation systems. © 2022 Journal of Clinical Hepatology. All rights reserved.     

大跨度连续钢桁架拱桥半悬臂拼装临时墩合理标高计算

当大跨度连续钢桁架拱桥采用支架法施工时，其临时支墩标高的合理设定对大桥的拼装线形和安全顺利拼装具有重要影响。结合钢桁梁桥的制造线形和架设过程中的钢梁线形变化，较系统地研究了临时墩的标高计算，推导了实用的计算公式。然后将该方法应用于某大跨度钢桁梁柔性拱组合结构桥梁，现场拼装和拆除结果表明：考虑预留50mm的设置方法，能更方便临时墩拆除，为类似桥梁施工计算提供借鉴。