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| 1 | Power optimization algorithm for OFDM underwater acoustic communication using adaptive channel estimation显示文摘An adaptive channel estimation algorithm for the channel length is proposed to construct a channel estimation model suitable for orthogonal frequency division multiplexing(OFDM)underwater acoustic communication signals for the dependence of traditional channel estimation algorithms on channel length information.This algorithm can be adopted to evaluate channel estimation quality in real time and to adaptively adjust the channel length of the channel estimation algorithm according to the evaluation result,which satisfies the need of accurate estimation of unknown underwater acoustic channels and communication application;based on the study on the relationship between the OFDM communication bit error rate and the subcarrier signal to noise ratio,a self-adjusting optimization scheme for OFDM subcarrier transmitting power is proposed,which realizes underwater communication with the low bit error rate through higher energy efficiency.The validity of the research content is verified through simulation and field experiments. | LUO Yasong HU Shengliang FENG Chengxu TONG Jijin | 2019 | Journal of Systems Engineering and Electronics2019，30，4： | 1 |
| 2 | Construction of an artificial intelligence system in dermatology: effectiveness and consideration of Chinese Skin Image Database (CSID)显示文摘After more than 60 years of development,artificial intelligence(AI)has been widely used in various fields.Especially in recent years,with the development of deep learning,AI has made many remarkable achievements in the medical field.Dermatology,as a clinical discipline with morphology as its main feature,is particularly suitable for the development of AI.The rapid development of skin imaging technology has helped dermatologists to assist in the diagnosis of diseases and has greatly improved the accuracy of diagnosis.Skin imaging data have natural big data attributes,which is important for AI research.The establishment of the Chinese Skin Image Database(CSID)has solved many problems such as isolated data islands and inconsistent data quality.Based on the CSID,many pioneering achievements have been made in the research and development of AI-assisted decision-making software,the establishment of expert organizations,personnel training,scientific research,and so on.At present,there are still many problems with AI in the field of dermatology,such as clinical validation,medical device licensing,interdisciplinary,and standard formulation,which urgently need to be solved by joint efforts of all parties. | Chengxu Li Wenmin Fei Yang Han Xiaoli Ning Ziyi Wang Keke Li Ke Xue Jingkai Xu Ruixing Yu Rusong Meng Feng Xu Weimin Ma Yong Cui | 2021 | Intelligent Medicine2021，1，2： | 1 |
| 3 | An accurate detection algorithm for time backtracked projectile-induced water columns based on the improved YOLO network显示文摘During a sea firing training,the intelligent detection of projectile-induced water column targets in a firing video is the prerequisite for and critical to the automatic calculation of miss distance,while the correct and precise calculation of miss distance is directly affected by the accuracy,false alarm rate and time delay of detection.After analyzing the characteristics of projectile-induced water columns,an accurate detection algorithm for time backtracked projectile-induced water columns based on the improved you only look once(YOLO)network is put forward.The capability and accuracy of detecting projectileinduced water column targets with the conventional YOLO network are improved by optimizing the anchor box through K-means clustering and embedding the squeeze and excitation(SE)attention module.The detection area is limited by adopting a sea-sky line detection algorithm based on gray level co-occurrence matrix(GLCM),so as to effectively eliminate such disturbances as ocean waves and ship wakes,and lower the false alarm rate of projectile-induced water column detection.The improved algorithm increases the mAP50 of water column detection by 30.3%.On the basis of correct detection,a time backtracking algorithm is designed with mean shift to track images containing projectile-induced water column in reverse time sequence.It accurately detects a projectile-induced water column at the time of its initial appearance as well as its pixel position in images,and considerably reduces detection delay,so as to provide the support for the automatic,accurate,and real-time calculation of miss distance. | LUO Yasong XU Jianghu FENG Chengxu ZHANG Kun | 2023 | Journal of Systems Engineering and Electronics2023，34，4： | 0 |
| 4 | Molecular dynamics for electrocatalysis:Mechanism explanation and performance prediction显示文摘Designing low-cost,high-performing electrocatalysts is key to green energy development,yet relying solely on the'synthesis-characterization'catalyst screening model is time-consuming and costly.There are two main applications for Molecular dynamics(MD)simulations in electrochemical reactions:explaining mechanisms and predicting performance,which play important roles in fabricating robust electrocatalysts.MD simulations of electrocatalysis include the adsorption and desorption of reactants,intermediates,and products in this review.The structural changes in active centers under various electric field states,the effects of alkali metal cations,common anions,and pH effects in the electrolyte on the electrocatalytic process are also discussed to reveal the reaction mechanism.Then the prediction of the catalysts performance in specific reaction using MD simulations are introduced.Finally,the optimization and challenges of MD techniques are discussed. | Yue Wang Haodong Shao Chengxu Zhang Feng Liu Jianqiang Zhao Sanyuan Zhu Michael K.H.Leung Jue Hu | 2023 | Energy Reviews2023，2，3： | 0 |
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