检索结果-南通市图书馆

Science China(Information Sciences) 2023年第5期66卷 88-99页

作者： yiyu chen Zheyi FAN Shuni chen Yixuan ZHU School of Information and Electronics Beijing Institute of Technology

Unsupervised person re-identification(re-ID) aims to train a discriminative model without identity annotations. State-of-the-art methods usually follow a clustering-based pipeline, which utilizes a clustering algorithm to generate pseudo-labels and performs model training iteratively. Despite the success of these methods, camera variation has not been well considered in the distance calculation step to reduce noise labels, which is the main reason for noise label generation. To address this problem, we design a plug-and-play method with low computational complexity to improve the distance calculation step in the pseudo-label generation stage. Specifically,(1) to alleviate the influence of intra-camera samples and select reliable inter-camera pairs, we propose inter-camera k-reciprocal nearest neighbor(IKNN) to mine reliable inter-camera positive pairs; and(2) to merge the relationship of reliable inter-camera pairs into the distance for better clustering, we design adaptive inter-camera encouragement(AIE) to encourage the distance of inter-camera positive pairs. Extensive experiments show consistent improvements in comparison with various state-of-the-art unsupervised re-ID methods, demonstrating the wide applicability and efectiveness of our method.

关键词： person re-identification noise label camera variation clustering deep learning

Hsien-wen Wu:a founder of the studies of ichthyology in Chin

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Protein & Cell 2023年第7期14卷 473-475页

作者： Shunping He yiyu chen State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China

The three-volume Osteichthyes,Cyprinifomes in Fauna Sinica was finally completed in *** the efforts of four generations of ichthyologists,the last volume has been offcially submitted to the Science Press for *** publication of this book is a lifelong dream of the Academician Hsien-wen Wu(伍献文,***)(Fig.1),a famous ichthyologist in China.

关键词： Academician 伍献文 printing

A Practical Reinforcement Learning Framework for Automatic Radar Detection

在线全文

学校读者我要写书评

暂无评论

ZTE Communications 2023年第3期21卷 22-28页

作者： YU Junpeng chen yiyu Nanjing Research Institute of Electronics Technology Nanjing 210039China Nanjing University Nanjing 210023China

At present,the parameters of radar detection rely heavily on manual adjustment and empirical knowledge,resulting in low *** manual adjustment methods cannot meet the requirements of modern radars for high efficiency,high precision,and high ***,it is necessary to explore a new intelligent radar control learning framework and technology to improve the capability and automation of radar *** learning is popular in decision task learning,but the shortage of samples in radar control tasks makes it difficult to meet the requirements of reinforcement *** address the above issues,we propose a practical radar operation reinforcement learning framework,and integrate offline reinforcement learning and meta-reinforcement learning methods to alleviate the sample requirements of reinforcement *** results show that our method can automatically perform as humans in radar detection with real-world settings,thereby promoting the practical application of reinforcement learning in radar operation.

关键词： meta-reinforcement learning radar detection reinforcement learning offline reinforcement learning

同方期刊数据库

Sequences of cytochrome b gene for primitive cyprinid fishes in East Asia and their phylogenetic concerning

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2001年第8期46卷 661-665页

作者： HE Shunping chen yiyu Nakajiama Tsuneo Institute of Hydrobiology Chinese Academy of SciencesWuhan 430072China Lake Biwa Museum 10910 OroshimoKusatsuShiga 525Japan

1140 bp of cytochrome b gene were amplified and sequenced from 14 species of primitive cyprinid fishes in East Asia. Aligned with other ten cytochrome b gene sequences of cyprinid fish from Europe and North America retrieved from Gene bank, we obtained a matrix of 24 DNA sequences. A cladogram was generated by the method of Maximum likelihood for the primitive cyprinid fishes. The result indicated that subfamily Leuciscinae and Danioninae do not form a monophyletic group. In the subfamily Danioninae, Opsariichthys biden and Zacco platypus are very primitive and form a natural group and located at the root. But the genera in subfamily Danioninae are included in different groups and have not direct relationship. Among them, Aphyocypris chinensis and Yaoshanicus arcus form a monophyletic group. Tanichthys albonubes and Gobiocypris rarus have a close relation to Gobioninae. The genus Danio is far from other genera in Danioninae. In our cladogram, the genera in Leuciscinae were divided into two groups that

关键词： cyprinidae molecular systematics cytochrome b gene phylogeny.

Numerical and Experimental Investigation on the Performance of Battery Thermal Management System Based on Micro Heat Pipe Array

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2022年第5期31卷 1531-1541页

作者： YANG Lulu XU Hongbo ZHANG Hainan chen yiyu LIU Ming TIAN Changqing Key Laboratory of Space Energy Conversion Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

Battery thermal management is very crucial for the safe and long-term operation of electric vehicles or hybrid electric *** this study,numerical simulation method is adopted to simulate the temperature field of Li-ion battery cell and *** is proved that the maximum temperature and maximum temperature difference of battery cell and module increase with the increase of charge/discharge rate(C-rate)of the *** battery module,it can reach a maximum temperature of 61.1℃at a C-rate of 2 under natural convection condition with the ambient temperature of 20.0℃.A battery thermal management system based on micro heat pipe array(BTMS-MHPA)is deeply *** are conducted to compare the cooling effect on the battery module with different cooling methods,which include natural cooling,only MHPA,MHPA with *** maximum temperature of battery module which is cooled by MHPA with a fan is 43.4℃at a C-rate of 2,which is lower than that in the condition of natural ***,the maximum temperature difference was also greatly reduced by the application of MHPA *** experimental results confirm that the feasibility and superiority of the BTMS-MHPA for guaranteeing the working temperature range and temperature uniformity of the battery.

关键词： battery thermal management micro heat pipe array Li-ion battery temperature field

Cyprininae phylogeny revealed independent origins of the Tibetan Plateau endemic polyploid cyprinids and their diversifications related to the Neogene uplift of the plateau

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2016年第11期59卷 1149-1165页

作者： Xuzhen Wang Xiaoni Gan Junbing Li yiyu chen Shunping He Key Laboratory of Aquatic Biodiversity and Conservation of the Chinese Academy of Sciences Institute of Hydrobiology Chinese Academy of Sciences

Origin and diversification of the Tibetan polyploid cyprinids(schizothoracins) may help us to explore relationships between diversification of the cyprinids and the Tibetan Plateau uplift. Cyprininae phylogeny was analyzed using mitochondrial and nuclear DNA sequences to trace origins of polyploidy and diversifications of schizothoracins. Ancestral states reconstruction for ploidy levels indicated that the Cyprininae was diploid origin and the schizothoracin clades tetraploid origins. There were two diversification rate shifts along with diversification of the cyprinine fishes in response to the Tibetan uplift. The unusual diversification shifts were located to branches subtending the clades of Tibetan polyploid cyprinids. Our analyses suggested that(i) phylogeny of Cyprininae recovered two independent origins of the Tibetan polyploidy schizothoracins;(ii) diversifications of the schizothoracins were closely related to the Neogene uplift of the Tibetan plateau in the following ways: the relatively ancient Late Oligocene-Middle Miocene adaptive radiation may be associated with the uplift of the southern Tibet and Himalaya; the Middle Miocene-Early Pleistocene lineage-specific diversification broadly coincident with major phase of the Neogene Tibetan uplift; and the most recent Pleistocene diversification shift in Schizothorax closely coincident with the successive Kunlun-Huanghe and Gonghe movements of the Tibetan uplift and the glaciation-induced climate oscillations on the plateau.

关键词： Cyprininae polyploid schizothoracins the Tibetan Plateau diversifications

The advance of adjuvant treatment for triple-negative breast cancer

在线全文

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2022年第2期19卷 187-201页

作者： Jingyu Ge Wenjia Zuo yiyu chen Zhiming Shao Keda Yu Department of Breast Surgery Fudan University Shanghai Cancer CenterShanghai 200032China Shanghai Medical College Fudan UniversityShanghai 200032China

Triple-negative breast cancer(TNBC)is a subtype of breast cancer characterized by its highly aggressive behavior,early recurrence,and poor outcomes,when compared with other *** to the absence of the estrogen receptor,progesterone receptor,and human epidermal growth factor receptor 2 expression,TNBC lacks meaningful biomarkers and an effective therapeutic *** remains the main adjuvant treatment for patients with ***/taxane-based regimens are the standard of care in adjuvant *** addition of capecitabine or platinum may offer extra benefits to patients with TNBC,but at the cost of increased toxicity or adverse ***-dense chemotherapy may enhance treatment efficacy in patients who are able to tolerate the treatment regimen,especially in high-risk *** a heterogenous disease,TNBC can be classified into several molecular subtypes according to genomic or transcriptional features,which may indicate potential targets for more precise and individualized treatment *** our increased understanding of signal pathways associated with TNBC,as well as the discovery of novel biomarkers indicative of TNBC prognosis,several new therapeutic options are under investigation,and some have already reported good *** this review,we summarized the current conventional therapeutic strategies and emerging clinical trials regarding adjuvant treatment for ***,we evaluated the prognostic value of several potential targets and the progress of targeted therapy in TNBC,both in neoadjuvant and adjuvant settings.

关键词： Triple-negative breast cancer adjuvant chemotherapy targeted therapy prognostic factors

3D printing of hydroxyapatite/tricalcium phosphate scaffold with hierarchical porous structure for bone regeneration

在线全文

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2020年第1期3卷 15-29页

作者： Xiangjia Li Yuan Yuan Luyang Liu Yuen‑Shan Leung yiyu chen Yuxing Guo Yang Chai Yong chen Epstein Department of Industrial and Systems Engineering University of Southern CaliforniaLos AngelesUSA Center for Craniofacial Molecular Biology University of Southern CaliforniaLos AngelesUSA Department of Chemical Engineering and Material Science University of Southern CaliforniaLos AngelesUSA Department of Aerospace and Mechanical Engineering University of Southern CaliforniaLos AngelesUSA Department of Oral and Maxillofacial Surgery Peking University School and Hospital of StomatologyBeijingChina

Three-dimensional(3D)-printed scaffolds have attracted considerable attention in recent years as they provide a suitable environment for bone cell tissue regeneration and can be customized in *** many other challenges,the material composition and geometric structure have major impacts on the performance of *** and tricalcium phosphate(HA/TCP),as the major constituents of natural bone and teeth,possess attractive biological properties and are widely used in bone scaffold *** fabrication methods have been investigated in attempts to achieve HA/TCP scaffolds with microporous structure enabling cell growth and nutrient ***,current 3D printing methods can only achieve the fabrication of HA/TCP scaffolds with certain range of microporous *** overcome this challenge,we developed a slurry-based microscale mask image projection stereolithography,allowing us to form a HA/TCP-based photocurable suspension with complex geometry including biomimetic features and hierarchical ***,the curing performance and physical properties of the HA/TCP suspension were investigated,and a circular movement process for the fabrication of highly viscous HA/TCP suspension was *** on these investigations,the scaffold composition was *** determined that a 30 wt%HA/TCP scaffold with biomimetic hierarchical structure exhibited superior mechanical properties and *** proliferation was investigated in vitro,and the surgery was conducted in a nude mouse in vivo model of long bone with cranial neural crest cells and bone marrow mesenchymal stem *** results showed our 3D-printed HA/TCP scaffold with biomimetic hierarchical structure is biocompatible and has sufficient mechanical strength for surgery.

关键词： 3D printing Slurry stereolithography Scaffold HA/TCP Hierarchical porosity

Mechanism and control of lake eutrophication

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2006年第19期51卷 2401-2412页

作者： QIN Boqiang YANG Liuyan chen Feizhou ZHU Guangwei ZHANG Lu chen yiyu Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China College of Environmental Sciences Nanjing University Nanjing 210093 China National Natural Science Foundation of China Beijing 100085 China

A review about lake naturally eutrophi- cating, the internal loading of nutrients from lake sediment as well as the mechanism of algal blooms and the control practices was made, especially the eutrophication problem of shallow lakes since sev- enty percent of fresh water lakes in China are shallow lakes. It was found that shallow lakes are apt toward eutrophication than deep lakes. Without any influ- ences of human activity, shallow lakes in the middle and lower reaches of Yangtze River are still easily eutrophicated, which may be owing to the effects of flood in this area. In shallow lakes, sediments are frequently disturbed by wind-wave and resuspended, which result in huge nutrients release to overlying water. This may be the major reason for higher in- ternal loading of nutrients in shallow lakes than in deep lakes. Algal bloom is an extreme response of lake ecosystem to the eutrophication. Appearance of algal blooms is related to physical condition of lakes, such as underwater radiation (or transparency), temperature, and hydrodynamic conditions, or related to geochemical conditions of lakes, like concentra- tions of nutrients and ratio of nitrogen to phosphorus, as well as the physiological advantage of cyanobac- teria such as vacuole for moving towards the radiant energy-rich zone and the mycosporine-like amino acids (MAAs) for resisting the harm of ultraviolet ra- diation. In shallow lakes, these advantages of cyanobacteria are favorable in the competition than in deep lakes. Also being the shallowness, it is more difficult to reduce nutrient loading and to control algae blooms in shallow lakes. For the control of eutrophi- cation, people should follow the sequence from pollution sources control, ecological restoration tocatchment management. To control the internal nu- trient release, physical, chemical, biological tech- niques, and even bionic techniques could be selected. The idea of ecological restoration for a eutrophic lake is to shift the ecosystem fr

关键词：湖泊超营养作用负载控制生态恢复

Noise‐tolerant matched filter scheme supplemented with neural dynamics algorithm for sea island extraction

在线全文

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2024年第4期9卷 996-1013页

作者： yiyu chen Dongyang Fu Difeng Wang Haoen Huang Yang Si Shangfeng Du School of Electronics and Information Engineering Guangdong Ocean UniversityZhanjiangChina State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhouChina School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhanChina

Achieving high‐precision extraction of sea islands from high‐resolution satellite remote sensing images is crucial for effective resource development and sustainable ***,achieving such accuracy for sea island extraction presents significant challenges due to the presence of extensive background interference.A more widely applicable noise‐tolerant matched filter(NTMF)scheme is proposed for sea island extraction based on the MF *** NTMF scheme effectively suppresses the background interference,leading to more accurate and robust sea island *** further enhance the accuracy and robustness of the NTMF scheme,a neural dynamics algorithm is supplemented that adds an error integration feedback term to counter noise interference during internal computer operations in practical *** comparative experiments were conducted on various remote sensing images of sea islands under different noisy working conditions to demonstrate the superiority of the proposed neural dynamics algorithm‐assisted NTMF *** experiments confirm the ad-vantages of using the NTMF scheme for sea island extraction with the assistance of neural dynamics algorithm.

关键词： edge detection image classification image recognition shape extraction