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Unsupervised Cross-Media Hashing Learning via Knowledge Graph

Chinese Journal of Electronics 2022年第6期31卷 1081-1091页

作者： YE Zhaoda HE Xiangteng peng yuxin Wangxuan Institute of Computer Technology Peking University

With the rapid growth of multimedia data, cross-media hashing has become an important technology for fast cross-media retrieval. Because the manual annotations are difficult to obtain in real-world application, unsupervised cross-media hashing is studied to address the hashing learning without manual *** unsupervised cross-media hashing methods generally focus on calculating the similarities through the features of multimedia data, while the learned hashing code cannot reflect the semantic relationship among the multimedia data, which hinders the accuracy in the cross-media retrieval. When humans try to understand multimedia data, the knowledge of concept relations in our brain plays an important role in obtaining high-level *** by this, we propose a knowledge guided unsupervised cross-media hashing(KGUCH) approach, which applies the knowledge graph to construct high-level semantic correlations for unsupervised cross-media hash *** contributions in this paper can be summarized as follows: 1) The knowledge graph is introduced as auxiliary knowledge to construct the semantic graph for the concepts in each image and text instance, which can bridge the multimedia data with high-level semantic correlations to improve the accuracy of learned hash codes for crossmedia retrieval. 2) The proposed KGUCH approach constructs correlation of the multimedia data from both the semantic and the feature aspects, which can exploit complementary information to promote the unsupervised cross-media hash learning. The experiments are conducted on three widely-used datasets, which verify the effectiveness of our proposed KGUCH approach.

关键词： knowledge graph fast cross-media retrieval multimedia data semantic graph unsupervised cross-media hashing methods learned hash codes feature extraction file organisation graph theory semantic networks unsupervised cross-media hashing learning unsupervised cross-media hashing approach multimedia computing information retrieval manual annotations learning (artificial intelligence) learned hashing code high-level semantic correlations unsupervised learning

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A temporal context model for boosting video annotation

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Science China(Information Sciences) 2013年第11期56卷 92-105页

作者： YI Jian peng yuxin XIAO JianGuo Institute of Computer Science and Technology Peking University

In this paper,we propose a new method to model the temporal context for boosting video annotation *** motivation of our idea mainly comes from the fact that temporally continuous shots in video are generally with relevant content,so that the performance of video annotation could be comparably boosted by mining the temporal dependency between shots in *** on this consideration,we propose a temporal context model to mine the redundant information between *** connecting our model with conditional random feld and borrowing the learning and inference approaches from it,we could obtain the refned probability of a concept occurring in the shot,which is the leverage of temporal context information and initial output of video *** with existing methods for temporal context mining of video annotation,our model could capture diferent kinds of shot dependency more accurately to improve the video annotation ***,our model is relatively simple and efcient,which is important for the applications which have large scale data to *** experimental results on the widely used TRECVID datasets exhibit the efectiveness of our method for improving video annotation accuracy.

关键词： video annotation temporal context conditional random feld video retrieval

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基于景观格局的玛纳斯河流域生境质量及生态风险研究

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水土保持研究 2025年第1期32卷 328-335页

作者：徐炳先彭雨欣李兰海付帅冯英香余杰江西财经大学财税与公共管理学院土地资源管理系中国科学院新疆生态与地理研究所新疆干旱区水循环与水利用重点实验室江西财经大学“大宗商品国际价格分析与预测研究”学科创新团队

[目的]综合分析评价玛纳斯河流域绿洲生境质量并甄别诱因，为流域生境改善及区域可持续发展提供参考。[方法]以玛纳斯河流域2020年高分辨率遥感影像数据为基础，结合景观生态学方法，应用InVEST模型和景观生态风险评价模型对玛纳斯河流... 详细信息

[目的]综合分析评价玛纳斯河流域绿洲生境质量并甄别诱因，为流域生境改善及区域可持续发展提供参考。[方法]以玛纳斯河流域2020年高分辨率遥感影像数据为基础，结合景观生态学方法，应用InVEST模型和景观生态风险评价模型对玛纳斯河流域生境质量和景观生态风险进行综合评价。[结果]2020年玛纳斯河流域生境质量均值为0.33,整体生境质量较差，防护林的较高退化风险和耕地的广泛分布是区域生境质量较差的主要诱因，高生境质量地类如湿地、水域等面临较高的退化风险。流域内防护林闭合程度低和林网结构不合理等导致其景观破碎化最为严重，湿地和水域景观干扰度较高，受人为影响较深。流域内较高生态风险区占比最大，达到37.82%,其与高生态风险区的总和占比超过70%,整体呈现出中部高、边缘低的层叠状分布特征。生境质量与景观生态风险二者存在较强的空间集聚效应，以高—高聚集和低—低聚集为主。[结论]景观格局的分布对区域生境质量和景观生态风险影响较大，未来需要重点针对流域内耕地的合理规划利用、防护林维护与建设的进一步加强以使其充分发挥效用、湿地与水域等的切实保护，以提高玛纳斯河流域生境质量和降低景观生态风险。

关键词：玛纳斯河流域防护林生境质量景观生态风险空间自相关

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Learning conditional photometric stereo with high-resolution features

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Computational Visual Media 2022年第1期8卷 105-118页

作者： Yakun Ju yuxin peng Muwei Jian Feng Gao Junyu Dong Department of Computer Science and Technology Ocean University of ChinaQingdao 266100China Wangxuan Institute of Computer Technology Peking UniversityBeijing 100871China School of Computer Science and Technology Shandong University of Finance and EconomicsJinan 250002China

Photometric stereo aims to reconstruct 3D geometry by recovering the dense surface orientation of a 3D object from multiple images under differing *** methods normally adopt simplified reflectance models to make the surface orientation ***,the real reflectances of surfaces greatly limit applicability of such methods to real-world *** deep neural networks have been employed to handle non-Lambertian surfaces,these methods are subject to blurring and errors,especially in high-frequency regions(such as crinkles and edges),caused by spectral bias:neural networks favor low-frequency representations so exhibit a bias towards smooth *** this paper,therefore,we propose a self-learning conditional network with multiscale features for photometric stereo,avoiding blurred reconstruction in such *** explorations include:(i)a multi-scale feature fusion architecture,which keeps high-resolution representations and deep feature extraction,simultaneously,and(ii)an improved gradient-motivated conditionally parameterized convolution(GM-CondConv)in our photometric stereo network,with different combinations of convolution kernels for varying *** experiments on public benchmark datasets show that our calibrated photometric stereo method outperforms the state-of-the-art.

关键词： photometric stereo normal estimation deep neural networks 3D reconstruction

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Prototype-based classifier learning for long-tailed visual recognition

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Science China(Information Sciences) 2022年第6期65卷 62-76页

作者： Xiu-Shen WEI Shu-Lin XU Hao CHEN Liang XIAO yuxin peng School of Computer Science and Engineering Nanjing University of Science and Technology Key Lab of Intelligent Perception and Systems for High-Dimensional Information of Ministry of Education and Jiangsu Key Lab of Image and Video Understanding for Social Security Wangxuan Institute of Computer Technology Peking University State Key Laboratory of Integrated Services Networks Xidian University

In this paper, we tackle the long-tailed visual recognition problem from the categorical prototype perspective by proposing a prototype-based classifier learning(PCL) method. Specifically, thanks to the generalization ability and robustness, categorical prototypes reveal their advantages of representing the category semantics. Coupled with their class-balance characteristic, categorical prototypes also show potential for handling data imbalance. In our PCL, we propose to generate the categorical classifiers based on the prototypes by performing a learnable mapping function. To further alleviate the impact of imbalance on classifier generation, two kinds of classifier calibration approaches are designed from both prototype-level and example-level aspects. Extensive experiments on five benchmark datasets, including the large-scale iNaturalist, Places-LT,and ImageNet-LT, justify that the proposed PCL can outperform state-of-the-arts. Furthermore, validation experiments can demonstrate the effectiveness of tailored designs in PCL for long-tailed problems.

关键词： long-tailed distribution categorical prototype classifier generation classifier calibration class imbalance

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Comparison of the water consumption levels of four shelterbelt tree species in a typical arid oasis in Northwest China

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International Journal of Agricultural and Biological Engineering 2024年第2期17卷 169-176页

作者： Shuai Fu Bingxian Xu Yufang Leng yuxin peng Guogen Tao Lanhai Li School of Taxation and Public Administration Jiangxi University of Finance and EconomicsNanchang 330013China Research team of International price analysis and prediction of bulk commodities Jiangxi University of Finance and EconomicsNanchang 330013China School of Foreign Languages Jiangxi University of Finance and EconomicsNanchang 330013China Laboratory of Water Cycle and Water Use in Arid Region Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Tianshan Snow Cover and Avalanche Observation and Research Station of Xinjiang Xinyuan 835800XinjiangChina

The shelterbelt is an indispensable barrier to the ecological and economic development of an *** moisture,groundwater and irrigation greatly affect the shelterbelt water consumption and *** this study,the transpiration rate of shelterbelt trees,soil moisture and meteorological data were collected to determine the effects of soil moisture and meteorological factors on the water consumption of different shelterbelt tree species via multivariate statistical *** results showed that the water consumption rate was positively correlated with solar radiation,air temperature and ***,the leaf transpiration rate exhibited the trend of *** Jabl.˃***˃*** Carr.>***,while the average daily water consumption decreased in the order of ***>*** Jabl.>*** Carr.>*** average daily water consumption levels of ***,*** Jabl.,*** *** *** were(9.15±0.92)kg/(tree∙d),(6.95±1.41)kg/(tree∙d),(4.43±1.32)kg/(tree∙d),and(1.58±0.18)kg/(tree∙d),*** the growing season,the soil water consumption levels of ***,*** Jabl.,*** Carr.,and *** in each shelterbelt tree stand reached 674.8,336.9,358.1 and 161.7 kg,*** than 96%of the soil moisture lost was provided by the upper 120-cm soil *** the influence and contribution of soil water and meteorological factors to shelterbelt water consumption is beneficial for shelterbelt management and protection.

关键词： water consumption irrigation management shelterbelts soil moisture climatic factors

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SlZF3 regulates tomato plant height by directly repressing SlGA20ox4 in the gibberellic acid biosynthesis pathway

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Horticulture Research 2023年第4期10卷 71-82页

作者： Jinying Luo Yunfei Tang Zhuannan Chu yuxin peng Jiawei Chen Huiyang Yu Chunmei Shi Jahanzeb Jafar Rong Chen Yaping Tang Yongen Lu Zhibiao Ye Ying Li Bo Ouyang National Key Laboratory for Germplasm Innovation&Utilization of Horticultural Crops College of Horticulture and Forestry SciencesHuazhong Agricultural UniversityWuhan 430070China College of Horticulture Henan Agricultural UniversityZhengzhou 450002China

Plant height is an important target trait for crop genetic *** previous work has identified a salt-tolerant C2H2 zinc finger,SlZF3,and its overexpression lines also showed a semi-dwarf phenotype,but themolecular mechanism remains to be ***,we characterized the dwarf phenotype in *** dwarfism is caused by a decrease in stem internode cell elongation and deficiency of bioactive gibberellic acids(GAs),and can be rescued by exogenous GA3 *** expression assays detected reduced expression of genes in the GA biosynthesis pathway of the overexpression lines,including *** protein-DNA interaction methods confirmed that SlZF3 can directly bind to the SlGA20ox4 promoter and inhibit its expression,and the interaction can also occur for SlKS and *** of SlGA20ox4 in the SlZF3-overexpressing line can recover the dwarf ***,SlZF3 regulates plant height by directly repressing genes in the tomato GA biosynthesis pathway.

关键词： dwarf height expressing

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Heat stress impairs floral meristem termination and fruit development by affecting the BR-SlCRCa cascade in tomato

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Plant Communications 2024年第4期5卷 208-223页

作者： Junqing Wu pengxue Li Meng Li Danyang Zhu Haochuan Ma Huimin Xu Shuang Li Jinbo Wei Xinxin Bian Mengyao Wang Yixuan Lai yuxin peng Haixiao Li Abidur Rahman Shuang Wu College of Horticulture Haixia Institute of Science and TechnologyFujian Agriculture and Forestry UniversityFuzhou 350002China Department of Plant Bio-Sciences Faculty of AgricultureIwate UniversityMorioka 020-8550Japan United Graduate School of Agricultural Sciences Iwate UniversityMorioka 020-8550Japan These authors contributed equally to this article

Floral meristem termination is a key step leading to carpel initiation and fruit *** frequent occurrence of heat stress due to global warming often disruptsfloral determinacy,resulting in defective fruit ***,the detailed mechanism behind this phenomenon is largely ***,we identify CRABS CLAW a(SlCRCa)as a key regulator offloral meristem termination in *** func-tions as an indispensablefloral meristem terminator by suppressing SlWUS activity through the TOMATO AGAMOUS 1(TAG1)–KNUCKLES(SlKNU)–INHIBITOR OF MERISTEM ACTIVITY(SlIMA)network.A direct binding assay revealed that SlCRCa specifically binds to the promoter and second intron of WUSCHEL(SlWUS).We also demonstrate that SlCRCa expression depends on brassinosteroid homeostasis in theflo-ral meristem,which is repressed by heat stress via the circadian factor EARLY FLOWERING 3(SlELF3).These results provide new insights intofloral meristem termination and the heat stress response inflowers and fruits of tomato and suggest that SlCRCa provides a platform for multiple protein interactions that may epigenetically abrogate stem cell activity at the transition fromfloral meristem to carpel initiation.

关键词： heat stress floral meristem termination BR-CRC fruit development

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Ni中间层对6061T6铝合金板/08Al异种金属电阻点焊接头的力学性能及组织的影响

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中国机械工程 2024年第7期35卷 1290-1298页

作者：彭宇欣刘省胡心彬湖北工业大学材料与化学工程学院武汉430068 湖北工业大学绿色轻工材料湖北省重点实验室武汉430068 车用轻质材料与加工湖北省工程实验室武汉430068

通过在钢板上添加Ni中间层,成功实现了6061T6铝合金板与08Al钢板的可靠连接,显著提高了铝/钢点焊接头的力学性能。研究结果显示,采用预制Ni中间层工艺可控制Ni中间层在钢板上的厚度与分布,减少Al-Fe脆性金属间化合物的形成;相较于直接添... 详细信息

通过在钢板上添加Ni中间层,成功实现了6061T6铝合金板与08Al钢板的可靠连接,显著提高了铝/钢点焊接头的力学性能。研究结果显示,采用预制Ni中间层工艺可控制Ni中间层在钢板上的厚度与分布,减少Al-Fe脆性金属间化合物的形成;相较于直接添加Ni箔中间层,预制Ni中间层工艺能有效增大焊核直径;钢板上激光熔覆Ni层的铝/钢电阻点焊接头最大拉剪力较高,比无中间层的接头最大拉剪力增大了35.5%。

关键词：铝/钢电阻点焊 6061T6铝合金中间层第一性原理计算

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卫星节目收录系统

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广播与电视技术 2006年第6期33卷 131-133页

作者：彭育新广州电视台

如今基于硬盘的节目制作和播出系统已十分普遍,本文介绍了卫星节目收录网络系统的实现办法和系统方案,可以实现节目素材的无磁带化传输和管理,以供后期制作和自动播出使用。

关键词：卫星收录 SDI 媒体网关服务器

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