检索结果-南通市图书馆

第43届中国控制会议

作者： Xiaoxia Yang Baolong Shi Guoqing Zhang yuanlei kang School of Information and Control Engineering Qingdao University of Technology CRRC Qingdao Sifang CO. LTD.

The diversion railing of subway stations can orderly divert passenger flow, playing an important role in guiding passengers to move along specific paths, maintaining order, and improving station operation efficiency and safety. The Massmotion software embedded with the social force model and the minimum cost model is used to simulate and analyze the impact of different railing lengths and desired crowd velocities on the evacuation process of passenger flow at the platform stair under the same passenger flow background. It is found that the flow control effect of the diversion railing with a certain internal inclination angle is better than that under the right angle by comparing the passenger flow density under different working conditions. The dynamic characteristics of evacuees characterized by the length of railings are investigated, and input and output data are *** system recognition models are adopted for data identification and validation. The results indicate that the presence of railings effectively reduces the density of personnel at the bottleneck of the stairs, but the increase in the desired passenger speed is more pronounced than the optimization degree brought about by the increase in railing length. In addition, the dynamic length change of the railing can affect the crowd density at the bottleneck of the stair in real time, and an accurate polynomial ARX model is obtained, which can provide a strong reference for the dynamic control system of the diversion railings.

关键词： social force model system identification diversion railing subway station pedestrian evacuation

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地铁车站候车区域乘客分配方法

城市轨道交通研究 2017年第1期20卷 83-86页

作者：康元磊张越卡斯柯信号有限公司上海工程师200070 中铁二院昆明公司昆明650200

针对地铁车站候车区域客流的分配问题,基于机动车交通流均衡分配理论,提出了一种候车区域乘客分配模型,以模拟地铁车站候车区域内客流的分配。以北京宣武门地铁站为例,通过统计分析该车站晚高峰时刻候车区域客流数据,验证了所构建的乘... 详细信息

针对地铁车站候车区域客流的分配问题,基于机动车交通流均衡分配理论,提出了一种候车区域乘客分配模型,以模拟地铁车站候车区域内客流的分配。以北京宣武门地铁站为例,通过统计分析该车站晚高峰时刻候车区域客流数据,验证了所构建的乘客分配模型的有效性。深入研究了不同进站客流率对于候车区域乘客分配的影响,提出站内设置实时动态引导信息的方法以提高候车区域的利用率。

关键词：地铁车站候车区域客流分配进站客流率动态引导信息

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基于精准停车及节能优化的列车速度跟随控制

城市轨道交通研究 2024年第6期27卷 215-220页

作者：彭云龙康元磊于逸尘李杰中车青岛四方机车车辆股份有限公司青岛266111 同济大学电子与信息工程学院上海201804

[目的]列车自动运行系统可以通过控制列车各执行机构实现列车的自主行驶,对节约轨道交通系统的运行成本、提高列车运行安全保障极为重要。针对单一控制方法在列车自动运行速度跟随控制过程中停车准确性较低,未能兼顾能耗优化等问题,提... 详细信息

[目的]列车自动运行系统可以通过控制列车各执行机构实现列车的自主行驶,对节约轨道交通系统的运行成本、提高列车运行安全保障极为重要。针对单一控制方法在列车自动运行速度跟随控制过程中停车准确性较低,未能兼顾能耗优化等问题,提出了一种列车自动运行速度跟随控制策略。[方法]所提方法在传统PID(比例-积分-微分)控制的基础上,通过模糊控制器对PID参数进行在线整定调节,并针对列车精准停车及运行节能分别进行算法设计。当列车运行至停车点附近时,停止使用基于预设目标速度的速度反馈控制方式,转而计算精准停车所需加速度,并进行加速度反馈控制以提高停车精准性。同时在列车巡航过程中设计了一种牵引-惰行循环的节能巡航工况,在检测列车符合相应巡航条件后,采用该工况实现整体运行能耗的优化。[结果及结论]在MATLAB/Simulink仿真软件中建立了列车及控制器的仿真模型,通过与PID控制及模糊自适应PID控制在精准停车、节能等性能指标的对比,验证了所提方法和模型的有效性。

关键词：城市轨道交通列车自动运行模糊自适应控制速度跟随控制精准停车节能优化

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基于仿真的地铁站乘客应急疏散

交通科技与经济 2022年第3期24卷 10-17页

作者：康元磊束展逸中车青岛四方机车车辆股份有限公司山东青岛266111

基于MassMotion软件对青岛站地铁站进行客流疏散仿真建模,以社会力模型作为行人动力学模型,以最小成本模型作为行人路径选择的决策机制,研究地铁站内设施设备、拥挤度和出口选择方式对乘客疏散效率的影响,力图为乘客安全疏散管理策略的... 详细信息

基于MassMotion软件对青岛站地铁站进行客流疏散仿真建模,以社会力模型作为行人动力学模型,以最小成本模型作为行人路径选择的决策机制,研究地铁站内设施设备、拥挤度和出口选择方式对乘客疏散效率的影响,力图为乘客安全疏散管理策略的制定提供参照。研究结果表明,在未达地铁站内最大通行能力时,初始总乘客数对疏散时间影响较小;在达到地铁站最大通行能力时,初始总乘客数对疏散时间影响较大;在疏散前期关闭站厅层或站台层主要设备对疏散时间影响较小,而在疏散后期则会造成总疏散时间延误;乘客以等比例选择疏散出口会延长总疏散时间,但可降低站内最大密度以避免踩踏事故的发生。

关键词：地铁站疏散社会力模型乘客 MassMotion软件仿真

Co-transformation to tobacco of Cre/lox site-specific recombination system and its precise recombination

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Chinese Science Bulletin 2000年第6期45卷 540-543页

作者： Lei Li Songmei Liu yuanlei Hu Zhongping Lin Peking Univ Natl Lab Prot Engn & Plant Genet Engn Beijing 100871 Peoples R China

For the temporally and spatially regulated expression of the barnase gene in plant, two kinds of plasmids with ere gene and its directly repeat recognition sites lox from bacteriophage P1 were constructed and co-transformed into tobacco by agrobacterium mediated procedure. The transgenic plants were conformed by PCR analysis. The blocking fragment between the two lox directly repeat sites was excised by Cre protein in the transgenic plant genome. Cloning and seguencing the DNA fragment from the co-transformed plant DNA showed that the precise DNA excision occurred in transgenic tobacco genome directed by Cre//ox site-specif ic recombination .

关键词： Cre/lox site-specific recombination system tobacco co-transformation precise recombination.

The implementation of rapid acquisition algorithm for GPS weak signal by using FPGA

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The implementation of rapid acquisition algorithm for GPS we...

A Graph-Based Semi-Supervised Approach for Few-Shot Class-Incremental Modulation Classification

第五届中国卫星导航学术年会

作者： Wang yuanlei Gao yang Wang meng Space Star Technology Co. Ltd

ISBN: (纸本)9783642547362

The traditional acquisition technology of low oribit GPS signal has been widely applied in the design of GPS navigation receiver. However, navigation receiver can only accept the navigation signal which comes from the other end of the earth when running above the navigation constellation, which results the decline of GPS navigation visibility and signal power , and the navigation signal power from high oribit navigation receiver will reduce 10dB at least than low oribit navigation receiver and traditional fast acquisition design can not meet design requirements of high oribit navigation receiver. Therefore, this paper present a design which increase times of coherent integration to improve ratio of carrier and noise of received signal, at the same time, it uses full link simulation by simulink to vertify feasibility of the design, the final design of weak signal acquisition, through the test of Xilinkcompany Virtex4 series FPGA chip based on the weak signal acquisition sensitivity up to -176dB. Because the GLONASS navigation system and BDS navigation and GPS navigation system using spread spectrum communication system, different with GPS navigation system in production of presucode ratio and presurange and the carrier frequence paramaters. Therefore, this fast acquisition algorithm for GPS weak signal adapt to the design of GLONASS navigation reciver and BDS navigation reciever.

关键词： GPS. Weak Signal. fast acquisition. High Orabit

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China Communications 2024年第11期21卷 88-103页

作者： Zhou Xiaoyu Qi Peihan Liu Qi Ding yuanlei Zheng Shilian Li Zan State Key Laboratory of Integrated Service Networks Xidian UniversityXi’an 710071China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China The No.011 Research Center Science and Technology on Communication Information Security Control LaboratoryJiaxing 314033China

With the successive application of deep learning(DL)in classification tasks,the DL-based modulation classification method has become the preference for its state-of-the-art ***,once the DL recognition model is pre-trained with fixed classes,the pre-trained model tends to predict incorrect results when identifying incremental ***,the incremental classes are usually emergent without label information or only a few labeled samples of incremental classes can be *** this context,we propose a graphbased semi-supervised approach to address the fewshot classes-incremental(FSCI)modulation classification *** proposed method is a twostage learning method,specifically,a warm-up model is trained for classifying old classes and incremental classes,where the unlabeled samples of incremental classes are uniformly labeled with the same label to alleviate the damage of the class imbalance *** the warm-up model is regarded as a feature extractor for constructing a similar graph to connect labeled samples and unlabeled samples,and the label propagation algorithm is adopted to propagate the label information from labeled nodes to unlabeled nodes in the graph to achieve the purpose of incremental classes *** results prove that the proposed method is superior to other finetuning methods and retrain methods.

关键词： deep learning few-shot label propagation modulation classification semi-supervised learning

A big-data approach for investigating destination image gap in Sanya City: When will the online and the offline goes parted?

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Regional Sustainability 2021年第1期2卷 98-108页

作者： Lingkun Meng Yi Liu yuanlei Wang Xiaojuan Li School of Tourism Management Sun Yat-sen UniversityZhuhai519082China

Tourism destination images in terms of the gaps between the projected and perceived images are of great significance in the development of ***,the use of big-data in tourism studies remains under-utilized despite the boom in big-data applications and the increasing number of electronic User Generated Contents(UGC).Aiming to take advantage of tourism UGC to fully understand the destination image gap between official promotion materials and tourist perception of Sanya City in China,this study innovatively employed a big-data analysis technique,Tourism Sentiment Evaluation(TSE)model and proposed a new analysis framework integrating the“cognitive-affective”model with the gpp analysis of projected and perceived destination image to explore the destination image gap of Sanya It is found that Sanya's perceptive destination image is overall consistent with its official positioning;however,there also exist image gaps between the two groups in terms of the impact of festival events and tourists'attitude towards core scenic spots amongst *** study's findings are discussed in light of their methodological,theoretical,and practical implications for destination positioning,marketing,and management.

关键词： Big-data Tourism reviews Destination image “Cognitive-affective”model Tourism sentiment evaluation model

Increase of sulphur-containing amino acids in transgenic potato with 10 ku zein gene from maize

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Chinese Science Bulletin 2001年第6期46卷 482-484页

作者： LI Lei LIU Songmei HU yuanlei ZHAO Weiping LIN Zhongping National Laboratory of Protein Engineering and Plant Genetic Engineering Peking UniversityBeijing 100871China College of Biology Beijing Forest UniversityBeijing 100083China 不详

The 10 ku zein gene of maize was under control of patatin class I promoter of potato and transferred into potato genome by the leaf-disc method. The expression of 10 ku zein was determined in the tuber of transgenic p... 详细信息

关键词： 10 ku zein gene patatin class I promoter sulphur- containing amino acids in potato quality improvement.