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流通数字化赋能全国统一大市场建设的机理与效应研究

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统计研究 2024年第4期41卷 40-53页

作者：郝爱民任禛冉净斐郑州航空工业管理学院经济学院首都经济贸易大学经济学院郑州轻工业大学经济与管理学院

建设全国统一大市场是加快构建新发展格局的基础支撑和内在要求。本文聚焦流通数字化发展对全国统一大市场建设的影响,实证检验流通数字化赋能全国统一大市场建设的传导机制和异质特征。研究发现,流通数字化发展能够显著促进全国统一大... 详细信息

建设全国统一大市场是加快构建新发展格局的基础支撑和内在要求。本文聚焦流通数字化发展对全国统一大市场建设的影响,实证检验流通数字化赋能全国统一大市场建设的传导机制和异质特征。研究发现,流通数字化发展能够显著促进全国统一大市场建设,且该研究结论具有较强的稳健性。机制检验结果表明,流通数字化发展能够通过加快创新要素流动、扩大企业规模、释放消费潜力等途径促进全国统一大市场建设。异质性检验结果表明,在基础设施水平、城镇化率和人口集聚程度较高地区,流通数字化对全国统一大市场建设的促进作用较为明显。进一步研究发现,流通数字化与统一大市场之间存在基于基础设施、城镇化率和人口集聚水平的门槛效应。本文研究结论为我国进一步加快流通产业的数字化转型、破除区域间要素流动壁垒、推进统一大市场建设提供了经验证据。

关键词：流通数字化统一大市场创新要素流动规模经济效应新发展格局

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Erratum to: Dynamic ocean inverse modeling based on differentiable rendering

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Computational Visual Media 2024年第3期10卷 609-609页

作者： Xueguang Xie Yang Gao Fei Hou aimin hao Hong Qin State Key Lab of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China Qingdao Research Institute Beihang UniversityQingdao 266100Chinaand Peng Cheng LabShenzhen 518000China SKLCS Institute of SoftwareChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Computer Science Stony Brook University(SUNY at Stony Brook)Stony BrookNew York 11794-2424USA

Erratum to Xueguang Xie,Yang Gao,Fei Hou,aimin hao&Hong *** ocean inverse modeling based on differentiable *** Visual Media Vol.10,No.2,279–294,***://doi10.1007/s41095-023-0338-4 The authors apologize for a hidden error in the *** is that the images in Figs.14(a)and 14(d)were mistakenly presented as left–right mirror *** authors have flipped them to ensure that the figures now correspond correctly with others in the subfigures(b,c,e,f).The accurate version of Fig.14 is provided as below.

关键词： ocean images inverse

A CADe system for nodule detection in thoracic CT images based on artificial neural network

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Science China(Information Sciences) 2017年第7期60卷 177-194页

作者： Xinglong LIU Fei HOU Hong QIN aimin hao State Key Laboratory of Virtual Reality Technology and Systems Beihang University School of Computer Science and Engineering Nanyang Technological University Department of Computer Science Stony Brook University

Lung cancer has been the leading cause of cancer-related deaths in 2015 in United States. Early detection of lung nodules will undoubtedly increase the five-year survival rate for lung cancer according to prior studies. In this paper, we propose a novel rating method based on geometrical and statistical features to extract initial nodule candidates and an artificial neural network approach to the detection of lung nodules. The novel method is solely based on 3D distribution of neighboring voxels instead of user-specified features. During initial candidates detection, we combine organized region properties calculated from connected component analysis with corresponding voxel value distributions from statistical analysis to reduce false positives while retaining true nodules. Then we devise multiple artificial neural networks(ANNs) trained from massive voxel neighbor sampling of different types of nodules and organize the outputs using a 3D scoring method to identify final nodules. The experiments on 107 CT cases with 252 nodules in LIDC-IDRI data sets have shown that our new method achieves sensitivity of 89.4% while reducing the false positives to 2.0 per case. Our comprehensive experiments have demonstrated our system would be of great assistance for diagnosis of lung nodules in clinical treatments.

关键词： artificial neutral network Lung nodule computed tomography computer aided detection nodule detection

Spatiotemporal consistency-based adaptive hand-held video stabilization

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Science China(Information Sciences) 2020年第1期63卷 226-228页

作者： Xiao LI Shuai LI Hong QIN aimin hao State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beihang University Qingdao Research Institute Department of Computer Science Stony Brook University

This study develops a novel, joint optimization method to successively respect spatial structure consistency and temporal feature constraints. Our method is more flexible and adaptive as we regard the camera multitrack motion to be noisy signals and adaptively suppress the noise without manual intervention. In addition, our method can achieve stabilization effects similar to that obtained by 3D

关键词： IMF EMD red frame Spatiotemporal consistency-based adaptive hand-held video stabilization

Automatic image matting and fusing for portrait synthesis

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Science China(Information Sciences) 2022年第2期65卷 235-237页

作者： Zhike YI Wenfeng SONG Shuai LI aimin hao State Key Laboratory of Virtual Reality Technology and Systems Beihang University

We propose an automatic image matting and fusing system for portrait synthesis in this *** firstly use a face detection algorithm to determine if the input contains a ***,we use a semantic segmentation neural network to generate a trimap and feed the trimap and the portrait into the neural network to predict the alpha channel ***,the input portrait’s background is replaced with the given background via an image synthesis algorithm to obtain the synthesized portrait.

关键词： Neural Network Automatic Image Matting Image Fusion Deep Learning Gradient Domain

生产性服务数智化对农业绿色全要素生产率的影响——兼论政府环境规制的调节作用

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科技管理研究 2024年第2期44卷 163-171页

作者：郝爱民刘育廷解梦菡郑州航空工业管理学院经济学院河南郑州450046

为推进农业农村现代化,亟需以生产性服务业数智化为契机,对传统农业生产方式进行全方位改造,提高农业综合生产能力。在理论阐述农业生产性服务数智化影响农业绿色全要素生产率(AGTFP)的内在机制基础上,构建包含金融服务、科技信息服务... 详细信息

为推进农业农村现代化,亟需以生产性服务业数智化为契机,对传统农业生产方式进行全方位改造,提高农业综合生产能力。在理论阐述农业生产性服务数智化影响农业绿色全要素生产率(AGTFP)的内在机制基础上,构建包含金融服务、科技信息服务和商贸流通服务三部分的农业生产性服务数智化综合评价指标体系,并通过回归模型对2014—2020年我国29个省(区、市)的面板数据进行实证检验。结果表明:生产性服务数智化改造对AGTFP水平的提升具有显著的促进作用。具体来讲,金融服务和商贸流通服务的数智化改造对AGTFP的影响呈现当期有效的特征,而科技信息服务数智化改造在较长的时间内仍可以保持对AGTFP的显著促进效应;农业生产性服务数智化促进作用存在明显的区域异质性,从强到弱依次为粮食主产区、粮食产销平衡区、粮食主销区;政府环境治理能够强化农业生产性服务数智化对AGTFP的影响。基于此,应大力推进现代信息技术对传统农业生产方式的改造,构建以科技信息服务为基础,金融服务、商贸流通服务为引领,拉动农业绿色全要素生产率提升的长效增长机制。

关键词：绿色农业农业绿色全要素生产率数智化转型环境规制农业农村现代化乡村振兴

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Interactive texture design and synthesis from mesh sketches

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Frontiers of Computer Science 2014年第2期8卷 330-341页

作者： Lili WANG Qinglin QI Yi CHEN Wei KE aimin hao State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing 100191 China Macao Polytechnic Institute Macao China

Geometry mesh introduces user control into tex- ture synthesis and editing, and brings more variations in the synthesized results. But still two problems related remain in need of better solutions. One problem is generating the meshes with desired size and pattern efficiently from easier user inputs. The other problem is improving the quality of synthesized results with mesh information. We present a new two-step texture design and synthesis method that addresses these two problems. Besides example texture, a small piece of mesh sketch drawn by hand or detected from example texture is input to our algorithm. And then a mesh synthesis method of geometry space is provided to avoid optimizations cell by cell. Distance and orientation features are introduced to im- prove the quality of mesh rasterization. Results show that with our method, users can design and synthesize textures from mesh sketches easily and interactively.

关键词： texture synthesis texture design feature-basedmethod structural texture

Haptics-equiped interactive PCI simulation for patient-specific surgery training and rehearsing

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Science China(Information Sciences) 2016年第10期59卷 233-238页

作者： Shuai LI Qing XIA aimin hao Hong QIN Qinping Zhao State Key Laboratory of Virtual Reality Technology and Systems Beihang University Department of Computer Science Stony Brook University

Despite the long history of medical simulations, suffering from the patient-specific heterogeneous heart physiological structure and complex intravascular procedures, it is still challenging for patient-specific percutaneous coronary intervention(PCI) surgery simulation. In this paper, we advocate a haptics-equiped interactive prototype system towards PCI surgeons training and patient-specific surgery rehearsing, which can afford trainees the opportunity to approximately experience the entire PCI procedures and customized emergency cases that might occur in common clinical settings. The full simulation covers tissue deformation, catheter and wire simulation, X-ray simulation, haptic feedback, and 3D realistic rendering, which in all give rise to the integrated physical, visual, haptic, and procedural realism. Our system can accommodate various comprehensive operations involved in PCI-related procedures, including feeding wires, releasing stents, injecting contrast medium, simulating X-ray, bleeding, etc. Moreover, our system framework is fully built upon CUDA, and thus can achieve real-time performance even on a common desktop. The high-fidelity, real-time efficiency and stableness of our system show great potentials for its practical applications in clinical training fields.

关键词： percutaneous coronary intervention(PCI) PCI surgery simulation patient-specific surgery rehearsing physically-based modeling haptics

Enhancing SAEAs with unevaluated solutions:a case study of relation model for expensive optimization

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Science China(Information Sciences) 2024年第2期67卷 41-58页

作者： hao hao Xiaoqun ZHANG aimin ZHOU Institute of Natural Sciences Shanghai Jiao Tong University Shanghai Frontiers Science Center of Molecule Intelligent Syntheses School of Computer Science and Technology East China Normal University

Surrogate-assisted evolutionary algorithms(SAEAs) hold significant importance in resolving expensive optimization problems. Extensive efforts have been devoted to improving the efficiency of SAEAs through the development of proficient model-assisted solution selection methods, which, however, first requires generating high-quality solutions. The fundamental paradigm of evaluating a limited number of solutions in each generation within SAEAs reduces the variance of adjacent populations, thereby affecting the quality of offspring solutions. This is a frequently encountered issue yet receives little attention. To address the issue, this paper presents a framework using unevaluated solutions to enhance the efficiency of *** surrogate model is employed to identify high-quality solutions for the direct generation of new solutions without evaluation. To ensure dependable selection, we have introduced two tailored relation models to select the optimal solution and the unevaluated population. A comprehensive experimental analysis is performed on two test suites, which showcases the superiority of the relation model over regression and classification models in the solution selection phase. Furthermore, the surrogate-selected unevaluated solutions with high potential have been shown to enhance the efficiency of the algorithm significantly.

关键词： expensive optimization unevaluated solutions relation model surrogate-assisted evolutionary algorithm