Lijun Cao

Chinese Academy of Sciences

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Xiaoqing Liu

Gannan Normal University

Yunyan Peng

Zhejiang University of Science and Technology

Jinyue Dai

Chinese Academy of Sciences

Hanwen Yan

Institute of Genetics and Developmental Biology

Jin Zhu

Chinese Academy of Sciences

Guohao Han

Institute of Genetics and Developmental Biology

Diaoguo An

Center for Agricultural Resources Research

Yilin Zhou

Chinese Academy of Agricultural Sciences

Kaiqi Huang

University of Chinese Academy of Sciences

Tiantian Gu

Ministry of Agriculture and Rural Affairs

Cooperative Institutions

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Ningbo Institute of Industrial Technology

Shandong University

Chinese Academy of Agricultural Sciences

Sun Yat-sen University

Tsinghua University

Nanjing Tech University

Institute of Genetics and Developmental Biology

Jiangsu University

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Biobased Nitrogen- and Oxygen-Codoped Carbon Materials for High-Performance Supercapacitor

ACS Sustainable Chemistry & Engineering (2018)

Yuan Liu Lijun Cao Jun Luo Yunyan Peng Qing Ji

Nitrogen and oxygen-codoped carbon materials (NOPC-x and NOPC-bis-CN-x) have been prepared from biobased polybenzoxazines by a soft-template method. Subsequently, their textural properties and surface chemistry are characterized by nitrogen isothermal adsorption, Raman spectroscopy, X-ray diffraction, transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). Results show that the higher content of the cyano group in benzoxazine monomers endows the carbon materials with higher specific surface area, higher graphitization degree, better pore size distribution, and more electrochemically active N-3 and O-2, as well as O-3. The electrochemical performances of the obtained carbons are evaluated by means of cyclic voltammetry (CV), galvanostatic charge/discharge tests (GCD), and electrochemical impedance spectroscopy (EIS). The results show that the NOPC-bis-CN-x systems possess much better electrochemical properties than those of NOPC-x. Especially for NOPC-bis-CN-3, it displays the highest specific capacitance of 167.3 F g–1 at 1 A g–1 and a good retention capability of more than 80% at a current density of 10 A g–1, as well as higher pseudocapacitance and good cycling stability. The excellent electrochemical performance together with the renewable features and the facile preparation route of NOPC-bis-CN-3 make it a promising biobased candidate for supercapacitor electrodes.

Pseudocapacitance

Carbon fibers

10.1021/acssuschemeng.8b05947

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Microalloying effects on the mechanical and electrical properties of CuCrSnZnSi alloys

Journal of Alloys and Compounds (2024)

Liukui Gong Ziming Chen Zhen Han Xiaoxiao Zhao Xiujun Jin

10.1016/j.jallcom.2024.176055

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Citations (0)

A Gradient heatmap based Table Structure Recognition

Lingjun Kong Yunchao Bao Qianwen Wang Lijun Cao Shengmei Zhao

Most methods to recognize the structure of a table are to use the object detection approach to directly locate each cell in the table or to segment the table line based on the fully convolutional network (FCN). The problem of the former is that it is laborious to recognize the distorted table, while the problem of the latter is that the sample imbalance makes it difficult to train the model. In this paper, a gradient heatmap based table structure recognition method is proposed, by exploring the gradient heatmaps of the vertical lines and horizontal lines in the table. Specifically, the pixels of the vertical lines of the table are obtained according to the gradient heatmap, then the pixels of the horizontal lines are obtained using the same method, and finally the table structure is restored by using the connected domain search method. Compared with the Single Shot MultiBox Detector (SSD) and Faster RCNN that directly detects cells, our Average Precision (AP) value reached up to 99.5%, which is much higher than the above models. Additionally, we demonstrate that the AP values of the proposed models are reduced almost negligibly when the IoU threshold increased from 0.5 to 0.75, while the AP value of the fast RCNN and SSD model decreased significantly.

Table (database)

Line (geometry)

Sample (material)

Decision table

10.1145/3457682.3457752

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Citations (2)

The method of video synopsis based on maximum motion power

Haibo Sun Lijun Cao Yuantao Xie Ming Zhao

This paper has studied on method of video synopsis based on maximum motion power, the events of interest were obtained by the method of background modeling and target tracking. Then these events had a time-shifting and recombinant, as well as calculating the maximum motion power to get the best length of video summary, the video summary had been created finally. The formula of video motion power was derived and validated, the problem of video summary had been transformed into the problem of calculating the biggest motion power of original video. This method can maintain the integrity of the original video information of interest while making the minimum length of the summary video.

Tracking (education)

Video post-processing

Quarter-pixel motion

10.1109/ivsurv.2011.6157019

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Citations (1)

License Plate Localization With Efficient Markov Chain Monte Carlo

Lijun Cao Xu Zhang Weihua Chen Kaiqi Huang

This paper presents a novel efficient Markov Chain Monte Carlo (MCMC) method for License Plate (LP) localization. The proposed method formulates the LP image feature and prior knowledge into a unified Bayesian framework. Then the localization problem is derived as a maximizing-a-posterior (MAP) problem, which integrates color, edge and character feature of LP. We propose an efficient MCMC method, taking integrated local geometrical likelihood as proposal probability to make the inference feasible. The experimental results on real dataset are very promising in terms of detection rate and localization accuracy.

Feature (linguistics)

10.1145/2632856.2632875

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Citations (1)

High-yield and rapid synthesis of ultrathin silver nanowires for low-haze transparent conductors

RSC Advances (2017)

Yang Liu Yingying Chen Rui Shi Lijun Cao Zhan Wang

Ultrathin nanowires for low haze transparent conductors have been rapidly synthesized in high yield by using the conucleants.

Haze

Transparent conducting film

10.1039/c6ra27760h

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Citations (39)

An Equalized Global Graph Model-Based Approach for Multicamera Object Tracking

IEEE Transactions on Circuits and Systems for Video Technology (2016)

Weihua Chen Lijun Cao Xiaotang Chen Kaiqi Huang

Nonoverlapping multicamera visual object tracking typically consists of two steps: single-camera object tracking (SCT) and inter-camera object tracking (ICT). Most of tracking methods focus on SCT, which happens in the same scene, while for real surveillance scenes, ICT is needed and single-camera tracking methods cannot work effectively. In this paper, we try to improve the overall multicamera object tracking performance by a global graph model with an improved similarity metric. Our method treats the similarities of single-camera tracking and inter-camera tracking differently and obtains the optimization in a global graph model. The results show that our method can work better even in the condition of poor SCT.

Tracking (education)

Tracking system

Single camera

10.1109/tcsvt.2016.2589619

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Citations (80)

Cross phase modulation model based on Volterra series transfer function in hybrid coherent QPSK/OOK systems

IEICE Electronics Express (2018)

Chong Han Jiajian Zhang Guo Chen Lijun Cao

In this paper, we present a general cross-phase modulation (XPM) model based on the Volterra series transfer function (VSTF) method in hybrid coherent QPSK/OOK wavelength division multiplexed (WDM) systems. The general model can entirely describe XPM effects in dispersion management (DM) fiber links. Normalized square deviation (NSD) is employed to test the precision of our model. The results show that we can achieve NSD less than 10−3 as launched peak power below 4 dBm/ch in DM fiber links. The accuracy of our model is sufficient for current hybrid coherent QPSK/OOK WDM systems. Based on our XPM model, the statistical properties of XPM effects can be predicted at the end of DM fiber links, the launched optical power can be optimized to achieve the optimum system performance, and the analytical expression of bit error rate (BER) can be obtained to predict the performance of QPSK channel coherent receiver. We present comprehensive analysis regarding the applications of our model through both theoretical analysis and Monte Carlo (MC) simulation. The good consistence between MC simulation and analytical result validates our theoretical derivation. Our results will be very useful for the design of hybrid coherent QPSK/OOK WDM systems without resorting to time-consuming numerical simulation.

Volterra series

Modulation (music)

10.1587/elex.15.20180453

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Citations (1)

A triple-laser trackers automatic measurement system for large-scale parts assembly

Wen Long Sun Zhenzhong Wei Lijun Cao

To address the problems of low efficiency, high cost and low automatic level existing in traditional laser tracking measurement systems, a triple-laser trackers measurement system for large-scale parts assembly is proposed. The system is composed of three laser trackers, and can fulfill automatic measurement throughout whole assembly process. Multiple extended datum marks are generated to increase assembly precision, whose 3D coordinates are calculated by known distances. Mathematical model is established, and simulation is accomplished. The simulation results show that the proposed system features relative high precision, automatic measurement and wide application.

Laser tracker

BitTorrent tracker

Tracking (education)

Tracking system

10.1109/icemi.2009.5274530

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Citations (13)

Taking advantages of intramolecular hydrogen bonding to prepare mechanically robust and catalyst-free vitrimer

Polymer (2020)

Shuaipeng Wang Na Teng Jinyue Dai Jingkai Liu Lijun Cao

10.1016/j.polymer.2020.123004

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Citations (62)