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Generating Cartoon Images from Face Photos with Cycle-Consistent Adversarial Networks

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Computers, Materials & Continua 2021年第11期69卷 2733-2747页

作者： Tao Zhang Zhanjie Zhang Wenjing Jia xiangjian he Jie Yang School of Artificial Intelligence and Computer Science Jiangnan UniversityWuxi214000China Key Laboratory of Artificial Intelligence Jiangsu214000China The Global Big Data Technologies Centre University of Technology SydneyUltimoNSW2007Australia The Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong UniversityShanghai201100China

The generative adversarial network(GAN)is first proposed in 2014,and this kind of network model is machine learning systems that can learn to measure a given distribution of data,one of the most important applications is style *** transfer is a class of vision and graphics problems where the goal is to learn the mapping between an input image and an output ***-GAN is a classic GAN model,which has a wide range of scenarios in style *** its unsupervised learning characteristics,the mapping is easy to be learned between an input image and an output ***,it is difficult for CYCLE-GAN to converge and generate high-quality *** order to solve this problem,spectral normalization is introduced into each convolutional kernel of the *** convolutional kernel reaches Lipschitz stability constraint with adding spectral normalization and the value of the convolutional kernel is limited to[0,1],which promotes the training process of the proposed ***,we use pretrained model(VGG16)to control the loss of image content in the position of l1 *** avoid overfitting,l1 regularization term and l2 regularization term are both used in the object loss *** terms of Frechet Inception Distance(FID)score evaluation,our proposed model achieves outstanding performance and preserves more discriminative *** results show that the proposed model converges faster and achieves better FID scores than the state of the art.

关键词： Generative adversarial network spectral normalization Lipschitz stability constraint VGG16 l1 regularization term l2 regularization term Frechet inception distance

FACLSTM:ConvLSTM with focused attention for scene text recognition

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Science China(Information Sciences) 2020年第2期63卷 35-48页

作者： Qingqing WANG Ye HUANG Wenjing JIA xiangjian he Michael BLUMENSTEIN Shujing LYU Yue LU Shanghai Key Laboratory of Multidimensional Information Processing East China Normal University Faculty of Engineering and Information Technology University of Technology Sydney Shanghai Institute of Intelligent Science and Technology Tongji University

Scene text recognition has recently been widely treated as a sequence-to-sequence prediction problem, where traditional fully-connected-LSTM(FC-LSTM) has played a critical role. Owing to the limitation of FC-LSTM, existing methods have to convert 2-D feature maps into 1-D sequential feature vectors, resulting in severe damages of the valuable spatial and structural information of text images. In this paper, we argue that scene text recognition is essentially a spatiotemporal prediction problem for its2-D image inputs, and propose a convolution LSTM(Conv LSTM)-based scene text recognizer, namely,FACLSTM, i.e., focused attention Conv LSTM, where the spatial correlation of pixels is fully leveraged when performing sequential prediction with LSTM. Particularly, the attention mechanism is properly incorporated into an efficient Conv LSTM structure via the convolutional operations and additional character center masks are generated to help focus attention on right feature areas. The experimental results on benchmark datasets IIIT5 K, SVT and CUTE demonstrate that our proposed FACLSTM performs competitively on the regular,low-resolution and noisy text images, and outperforms the state-of-the-art approaches on the curved text images with large margins.

关键词： scene text recognition convolutional LSTM focused attention spatial correlation sequential prediction

A case study of comparing two dimerized acceptor molecules built by different branch-connected and terminal-connected approaches

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Science China Chemistry 2024年第5期67卷 1687-1696页

作者： Kangqiao Ma Huazhe Liang Yuxin Wang Tengfei he Tainan Duan Xiaodong Si Wendi Shi Guankui Long xiangjian Cao Zhaoyang Yao xiangjian Wan Chenxi Li Bin Kan Yongsheng Chen State Key Laboratory and Institute of Elemento-Organic Chemistry Frontiers Science Center for New Organic MatterThe Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsInstitute of Polymer ChemistryRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China School of Materials Science and Engineering National Institute for Advanced MaterialsRenewable Energy Conversion and Storage Center(RECAST)Nankai UniversityTianjin 300350China Chongqing Institute of Green and Intelligent Technology Chongqing SchoolUniversity of Chinese Academy of Sciences(UCAS Chongqing)Chinese Academy of SciencesChongqing 400015China

Dimerized small-molecule acceptors(SMAs) built by the conventional connection of terminal groups of monomers have contributed to exciting long-term stabilities of organic solar cells(OSCs). However, device efficiencies, especially fill factors(FFs), still need to be improved. This probably originates from unsymmetrical molecular structure/conformation-determined less compact/ordered molecular stackings, such as ineffective stackings of constraint terminals. herein, an exotic dimerized SMA of BC-Th is established by bridging the branched groups(BC-type, branch coupling) of two monomers rather than conventional terminal units(TC-type, terminal coupling). Benefiting from the three-dimensional conformation and more uncurbed terminals,BC-Th exhibits multiple molecular orientations along with a larger dielectric constant and electron mobility compared with TCTh. Finally, an efficiency of 17.43% is achieved by BC-Th-based OSCs, along with the highest FF of 79.13% among all dimerized SMAs-based OSCs to date. When introducing L8-BO as the third component, overall enhanced efficiency of 18.05%and FF of 80.11% are further afforded. Contrarily, TC-Th-based OSCs exhibit much inferior PCE of 16.29% and FF of 74.81%,demonstrating the great advantages of “branch coupling” over “terminal coupling” when building dimerized SMAs.

关键词： organic solar cells dimerized acceptor molecules branch coupling morphology control stability

Enhanced kernel minimum squared error algorithm and its application in face recognition

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Journal of Southeast University(English Edition) 2016年第1期32卷 35-38页

作者：赵英男何祥健陈北京赵晓平南京信息工程大学江苏网络监控工程中心南京210044 南京信息工程大学计算机与软件学院南京210044 悉尼科技大学计算机与通信学院

To improve the classification performance of the kernel minimum squared error（ KMSE）, an enhanced KMSE algorithm（ EKMSE） is proposed. It redefines the regular objective function by introducing a novel class label definition, and the relative class label matrix can be adaptively adjusted to the kernel *** with the common methods, the newobjective function can enlarge the distance between different classes, which therefore yields better recognition rates. In addition, an iteration parameter searching technique is adopted to improve the computational efficiency. The extensive experiments on FERET and GT face databases illustrate the feasibility and efficiency of the proposed EKMSE. It outperforms the original MSE, KMSE,some KMSE improvement methods, and even the sparse representation-based techniques in face recognition, such as collaborate representation classification（ CRC）.

关键词： minimum squared error kernel minimum squared error pattern recognition face recognition

EXISTENCE OF HOPF BIFURCATION PROBLEMS WITH JUMPING NONLINEARITIES

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Annals of Differential Equations 1995年第2期11卷 127-146页

作者： he xiangjian & Jiang Zhuhan(Statistics and Computing Science, University of New England,Armidale, NSW 2351, Australia)

In this paper, we consider the system where A(λ) is a linear transformation on Rn for each λ, α (λ,x) is an operator from R × Rn to Rn and λ is a real parameter. We examine large periodic solutions and drop the assumption of continuity of a(λ,x) near the origin. We consider what happens if a pair of eigenvalues of the linear part of the right hand side in (0. 1) crosses the imaginary axis for large where denotes the norm in Rn.

关键词： Hopf bifurcation at infinity periodic sloutions jumping nonlinearities

Delicate chemical structure regulation of nonfullerene acceptor for efficient and large thickness organic solar cells

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Science China Chemistry 2024年第5期67卷 1596-1604页

作者： Zhe Zhang Wanying Feng Yunxin Zhang Shaohui Yuan Yuyang Bai Peiran Wang Zhaoyang Yao Chenxi Li Tainan Duan xiangjian Wan Bin Kan Yongsheng Chen State Key Laboratory and Institute of Elemento-Organic Chemistry Frontiers Science Center for New Organic MatterThe Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China School of Materials Science and Engineering National Institute for Advanced MaterialsNankai UniversityTianjin 300350China Chongqing Institute of Green and Intelligent Technology Chongqing SchoolUniversity of Chinese Academy of Sciences(UCAS Chongqing)Chinese Academy of SciencesChongqing 400722China

Inspired by the success of CH-series acceptors, a small-molecular acceptor, CH-Tz was reported by adopting a new conjugationextended electron-deficient unit([1,2,5]thiadiazolo[3,4-b]pyrazine) on the central core. Owing to the enhanced inter-/intramolecular interactions, CH-Tz exhibited near-infrared absorption and an effective three-dimensional molecular packing network in its single crystal. When blended with polymer donor PM6, the binary device achieved a high power conversion efficiency(PCE) of 18.54%, with a notable short-circuit current density(J_(sc)) of 27.54 m A cm-2and an excellent fill factor(FF) over 80%,which can be partly ascribed to the balanced charge transport properties in the blend film. After employing D18-Cl as the third component, an enhanced PCE of 18.85% was achieved due to a more obvious fiber network. Impressively, the CH-Tz-based OSC devices show excellent thermal stability and thickness insensitivity. Record-breaking Jscof 28.92 m A cm-2was reached for PM6:D18-Cl:CH-Tz ternary device with a thickness of 560 nm. Besides, CH-Tz shows potential in fabricating multicomponent high-performance organic solar cells, where over 19% efficiency could be realized in the quaternary device. Our work advances the strong influence of electron-deficient central units on molecular photovoltaic properties and guides the design of acceptors for stable and large-thickness organic solar cells.

关键词： organic solar cells non-fullerene acceptor central unit large thickness molecular packing

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雷诺格宾护岸在河道治理中的应用

湖南水利水电 2020年第6期 86-87,92页

作者：李庆何香建临湘市龙源水资源保护中心湖南岳阳414300 湖南省水利水电科学研究院湖南长沙410007

雷诺格宾新型护岸结构作为国内近年来迅速崛起的一个新型防护技术,具有整体性好、反滤性要求低、易于施工等优点。该技术既满足汛期护岸边坡水土保持需求,又避免了两侧河堤沿用混凝土护岸等施工工艺对生态环境修复的不利影响。文章以临... 详细信息

雷诺格宾新型护岸结构作为国内近年来迅速崛起的一个新型防护技术,具有整体性好、反滤性要求低、易于施工等优点。该技术既满足汛期护岸边坡水土保持需求,又避免了两侧河堤沿用混凝土护岸等施工工艺对生态环境修复的不利影响。文章以临湘市源潭河流域综合治理中的护岸工程为背景,采用雷诺格宾护岸的河道护坡治理形式,对雷诺格宾护岸的施工工艺进行探讨。

关键词：雷诺格宾护岸河道治理生态修复水土保持

High-speed flexible near-infrared organic photodiode for optical communication

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National Science Review 2024年第03期11卷 227-238页

作者： Yu Zhu Hongbin Chen Ruiman Han Hao Qin Zhaoyang Yao Hang Liu Yanfeng Ma xiangjian Wan Guanghui Li Yongsheng Chen The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Institute of Polymer ChemistryTianjin Key Laboratory of Functional Polymer Materials College of Chemistry and Renewable Energy Conversion and Storage Center(RECAST) Nankai University State Key Laboratory of Elemento-Organic Chemistry Nankai University

Optical communication is a particularly compelling technology for tackling the speed and capacity bottlenecks in data communication in modern society. Currently, the silicon photodetector plays a dominant role in high-speed optical communication across the visible-near-infrared spectrum. However, its intrinsic rigid structure, high working bias and low responsivity essentially limit its application in next-generation flexible optoelectronic devices. herein, we report a narrow-bandgap non-fullerene acceptor（NFA） with a remarkable π-extension in the direction of both central and end units（CH17） with respect to the Y6 series, which demonstrates a more effective and compact 3D molecular packing, leading to lower trap states and energetic disorders in the photoactive film. Consequently, the optimized solution-processed organic photodetector（OPD） with CH17 exhibits a remarkable response time of 91 ns（λ = 880 nm） due to the high charge mobility and low parasitic capacitance, exceeding the values of most commercial Si photodiodes and all NFA-based OPDs operating in self-powered mode. More significantly, the flexible OPD exhibits negligible performance attenuation（hermore, the high-speed OPD demonstrates a high data transmission rate of 80 MHz with a bit error rate of 3.5 × 10-4, meaning it has great potential in next-generation high-speed flexible optical communication systems.

关键词： flexible organic photodetector high-speed NIR organic photodetector optical communication light fidelity narrow-bandgap non-fullerene acceptors

顾及灯光强度区间的夜间灯光指数构建及其与社会参数的相关性分析

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地球信息科学学报 2024年第7期26卷 1717-1732页

作者：王毓乾宋雪鹏何悦谢相建谭永滨宜宾学院人工智能与大数据学部宜宾644000 江西江汇地质工程勘察院有限公司上饶334006 东华理工大学测绘与空间信息工程学院南昌330013 东华理工大学自然资源部环鄱阳湖区域矿山环境监测与治理重点实验室南昌330013

一些社会参数可能只与特定辐射强度范围内的夜间灯光保持相关性,而传统的夜间灯光指数局限于夜光遥感影像的全体辐射像元,在一定程度上限制了夜光遥感的应用潜力。本文提出一种顾及灯光强度区间的夜间灯光指数构建方法,利用2012—2020年... 详细信息

一些社会参数可能只与特定辐射强度范围内的夜间灯光保持相关性,而传统的夜间灯光指数局限于夜光遥感影像的全体辐射像元,在一定程度上限制了夜光遥感的应用潜力。本文提出一种顾及灯光强度区间的夜间灯光指数构建方法,利用2012—2020年的NPP-VIIRS夜间灯光数据计算了中国各省和36个主要城市的5050组特定连续灯光辐射强度区间的区域灯光总值,在省、市2个空间尺度上分别与筛选后的39项和24项社会参数进行相关性分析。除了省级尺度一项、市级尺度2项未通过显著性检验的社会参数,确定了其他社会参数对应的最佳灯光辐射强度区间。与传统的区域灯光总值相比,最佳区间的灯光辐射总值与省、市两级各种不同类型的社会参数的相关性显著提高,相关系数平均分别提高了0.06和0.08;一些与区域灯光总值无明显相关性的社会参数,与最佳区间的区域灯光总值表现出较强的相关性。大部分社会参数的最佳灯光辐射强度区间比较稳定,随时间变化波动较小。各行业社会参数的最佳灯光辐射强度区间表现出明显的差异性与层次性,它们有助于更深入地分析参数与夜间灯光之间的关联关系,评估夜光遥感数据的背景噪音对参数分析的影响。顾及灯光强度区间的夜间灯光指数构建可以提高夜光遥感在社会参数研究领域的应用潜力。

关键词： NPP-VIIRS 夜间灯光指数社会参数相关性分析灯光辐射强度区间