检索结果-南通市图书馆

Complete Your Mobility： linking Trajectories Across Heterogeneous Mobility Data Sources

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2018年第4期33卷 792-806页

作者： Guo-Wei Wang Jin-dou Zhang Jing li School of Computer Science and Technology University of Science and Technology of China Hefei 230026 China

Nowadays, human activities and movements are recorded by a variety of tools, forming different trajectory sets which are usually isolated from one another. Thus, it is very important to link different trajectories of one person in different sets to provide massive information for facilitating trajectory mining tasks. Most prior work took advantages of only one dimensional information to link trajectories and can link trajectories in a one-to-many manner （providing several candidate trajectories to link to one specific trajectory）. In this paper, we propose a novel approach called one-to-one constraint trajectory linking with multi-dimensional information （OCTL） that links the corresponding trajectories of one person in different sets in a one-to-one manner. We extract multidimensional features from different trajectory datasets for corresponding relationships prediction, including spatial, temporal and spatio-temporal information, which jointly describe the relationships between trajectories. Using these features, we calculate the corresponding probabilities between trajectories in different datasets. Then, we formulate the link inference problem as a bipartite graph matching problem and employ effective methods to link one trajectory to another. Moreover, the advantages of our approach are empirically verified on two real-world trajectory sets with convincing results.

关键词： trajectory linking trajectory data mining trajectory similarity mobility pattern mining

酶联免疫法在犬细粒棘球绦虫抗原检测中的应用

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中兽医医药杂志 2017年第5期36卷 58-59页

作者：杜玉祥王晓怡哈利豆思远李勇生鄂承钧甘肃省动物疫病预防控制中心甘肃兰州730046 甘肃省天水市动物卫生监督所甘肃天水741020

2011~2015年,对甘肃省18个犬细粒棘球蚴流行县区进行犬包虫病感染情况调查,采集犬粪样品16 200份,应用酶联免疫法进行包虫抗原检测。结果显示,犬包虫病阳性率由2011年的35.0%下降为2015年的3.0%。通过综合防控,有效控制了甘肃省犬细粒... 详细信息

2011~2015年,对甘肃省18个犬细粒棘球蚴流行县区进行犬包虫病感染情况调查,采集犬粪样品16 200份,应用酶联免疫法进行包虫抗原检测。结果显示,犬包虫病阳性率由2011年的35.0%下降为2015年的3.0%。通过综合防控,有效控制了甘肃省犬细粒棘球绦虫病流行与传播。

关键词：犬细粒棘球蚴酶联免疫粪抗原

Improved Deformable Part Model For Object Detection Based on Scale Invariant Feature Transform

在线全文

学校读者我要写书评

暂无评论

Improved Deformable Part Model For Object Detection Based on...

Nano-sized stationary phase packings retained by single-particle frit for microchip liquid chromatography

第25届中国控制与决策会议

作者： Jianfang dou Jianxun li Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China

ISBN: (纸本)9781467355339

We propose an approach to improving the detection results of a generic offline trained detector on frames from a specific video. For two consecutive frames of a video with the object, deformable part model(DPM) detection is perform to get the original detections. Then respectively obtain the image patches corresponding to the detected root box and part boxes. Thirdly, extract scale invariant feature transform features(SIFT) from those image patches and match the sift features by KD-Tree. Finally, get the SIFTPM detection result of from the matches between image patches of continuous frames. We focus on methods with high precision detection results since it is necessitated in real application. Extensive experiments with state-of-the-art detector demonstrate the efficacy of our approach..

关键词： object detection deformable part model scale invariant feature transform KD-Tree.

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

Chinese Chemical Letters 2024年第4期35卷 486-489页

作者： Wangyan Hu Ke li Xiangnan dou Ning li Xiayan Wang Center Excellence for Environmental Safety and Biological Effects Beijing Key Laboratory for Green Catalysis and SeparationDepartment of ChemistryBeijing University of TechnologyBeijing 100124China Center for Environmental Metrology National Institute of MetrologyBeijing 100029China

Modern chromatography is increasingly focused on miniaturization and integration. Compared to conventional liquid chromatography, microfluidic chip liquid chromatography(microchip-LC) has the potential due to its zero-dead volume connection and ease of integration. Nano-sized packings have the potential to significantly enhance separation performance in microchip-LC. However, their application has been hindered by packing difficulties. This study presents a method for packing nano-sized silica particles into a microchannel as the stationary phase. The microchip-LC packed column was prepared by combining the weir and the porous silica single-particle as frit to retain the packing particles. A surface tensionbased single-particle picking technique was established to insert porous single-particle frit into glass microchannels. Additionally, we developed a slurry packing method that utilizes air pressure to inject nano-sized packing into the microchannel. Pressure-driven chromatographic separation was performed using this nano-packed column integrated into a glass microchip. The mixture of four PAHs was successfully separated within just 8 min using a 5 mm separation channel length, achieving high theoretical plates(10~6plates/m). Overall, these findings demonstrate the potential of utilizing nano-sized packings for enhancing chromatographic performance in microchip systems.

关键词： Nano-size packing Single-particle frit Packed column Microchip LC Chromatographic separation

Quantized Decoders that Maximize Mutual Information for Polar Codes

在线全文

学校读者我要写书评

暂无评论

China Communications 2024年第7期21卷 125-134页

作者： Zhu Hongfei Cao Zhiwei Zhao Yuping li dou School of Electronics Engineering and Computer Science Peking UniversityBeijing 100871China

In this paper,we innovatively associate the mutual information with the frame error rate(FER)performance and propose novel quantized decoders for polar *** on the optimal quantizer of binary-input discrete memoryless channels(BDMCs),the proposed decoders quantize the virtual subchannels of polar codes to maximize mutual information(MMI)between source bits and quantized *** nested structure of polar codes ensures that the MMI quantization can be implemented stage by *** results show that the proposed MMI decoders with 4 quantization bits outperform the existing nonuniform quantized decoders that minimize mean-squared error(MMSE)with 4 quantization bits,and yield even better performance than uniform MMI quantized decoders with 5 quantization ***,the proposed 5-bit quantized MMI decoders approach the floating-point decoders with negligible performance loss.

关键词： maximize mutual information polar codes quantization successive cancellation decoding

Pathogen-informed breeding for crop disease resistance

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2021年第2期63卷 305-311页

作者： Qi li Bi Wang Jinping Yu Daolong dou Jiangsu Key Laboratory for the Research and Utilization of Plant Resources Institute of BotanyJiangsu Province and Chinese Academy of SciencesNanjing 210014China Department of Plant Pathology Nanjing Agricultural UniversityNanjing 210095China

The development of durable and broad-spectrum resistance is an economical and eco-friendly approach to control crop diseases for sustainable agricultural production. Emerging knowledge of the molecular basis of pathogenesis and plant–pathogen interactions has contributed to the development of novel pathogen-informed breeding strategies beyond the limits imposed by conventional breeding. Here,we review the current status of pathogen-assisted resistance-related gene cloning. We also describe how pathogen effector proteins can be used to identify resistance resources and to inform cultivar deployment. Finally, we summarize the main approaches for pathogen-directed plant improvement,including transgenesis and genome editing. Thus, we describe the emerging role of pathogen-related studies in the breeding of disease-resistant varieties, and propose innovative pathogen-informed strategies for future applications.

关键词： disease resistance breeding effector protein plant immune system plant pathogens

Performance Analysis of Optimal Demodulation for APK Without Constellation Knowledge

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2013年第2期20卷 69-73页

作者： Chao li Zheng dou lin Qi li-li Guo Information and Communication Engineering College Harbin Engineering University

In this paper,a novel demodulation algorithm without constellation knowledge ( CK) for Amplitude-Phase Keying ( APK) signals is introduced,which is based on the minimum probability of symbol error ( MPSE) criterion,optimal in performance and suitable for non-cooperative communication. For reducing the complexity,an on-line algorithm is derived. Using preceding algorithms,asymptotic performance of the proposed algorithm is proved theoretically. Numerical simulations are also provided to validate the analytical results. Our study of asymptotic performance shows that the performance of demodulation for any APK signals without CK is identical with the APK optimal receiver with CK when the number of available data symbols goes to infinity.

关键词： Non-cooperative communication modulation classification decision theory APK

Research on Bionic Jumping and Soft Landing of Single Leg System in Quadruped Robot

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2023年第5期20卷 2088-2107页

作者： Jinzhu Zhang Miao li Jiandong Cao Yuhan dou Xiaoyan Xiong College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan030024China

This paper proposed a novel multi-motion wheel-leg-separated quadruped robot that can adapt to both the structured and unstructured *** models of the positive/inverse position,velocity,acceleration,and workspace of the single leg mechanism in the quadruped robot were established.A single leg complex dynamic model of the quadruped robot is derived,considering the mass and inertial force of all the components in the mechanical *** with the human jumping law in situ,the jumping trajectory of the single leg was *** reduce landing impact,a soft landing strategy based on motion planning was proposed by simulating human knee bending and buffering *** change law of the kinetic energy and momentum of all the links in the single leg mechanism during the jump process was studied,and the influencing factors of jump height were analyzed to realize the height control of the *** leg jumping dynamics model was established,and a dynamic control strategy for trajectory tracking with foot force compensation was *** Adams and MATLAB/Simulink software,the jump simulation of single leg mechanism was carried *** prototype of quadruped robot was developed,and the jumping experiment of the single leg mechanism was *** robot's single leg bionic jumping and soft landing control are realized.

关键词： Wheel-leg-separated quadruped robot Bionic jumping Dynamic modeling Soft landing

Effects of air plasma flame on the ZrB_(2)-based UHTC coatings:Microstructure,phase evolution and ablation resistance

维普期刊数据库评论

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 of Materials Science & Technology 2023年第27期158卷 194-206页

作者： dou Hu Qiangang Fu Lei Zhou Xiaoxuan li Bing liu State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Fiber Reinforced Light-Weight CompositesNorthwestern Polytechnical UniversityXi’an 710072China

As for the air plasma sprayed ZrB_(2)-based coatings,B content change caused by inevitable oxidation is predictable but commonly *** by air plasma flame,the B element loss and residual B_(2) O_(3) in the sprayed ZrB_(2) coating were ***,how the B content change affects the microstructure,phase evolution,and ablation resistance(2.4 MW/m^(2),60 s)of ZrB_(2)-based coatings with different sec-ondary phases(SiC,MoSi_(2),and TaC)was *** B element loss contributed to the increase in surface temperature and the decline in the sintering degree of the ZrO_(2) *** evaporation of residual B_(2)O_(3) caused damage to the coating structure in the form of pores,whose negative effect was enhanced and reduced by MoSi_(2) and TaC secondary phases,*** work will provide some insight into thermally sprayed non-oxide ceramic coatings in the atmosphere.

关键词： Plasma spraying UHTCs Ablation behavior Microstructure ZrB_(2)