检索结果-南通市图书馆

Deep learning‐based action recognition with 3D skeleton: A survey

在线全文

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2021年第1期6卷 80-92页

作者： Yuling Xing jia zhu South China Normal University GuangzhouChina

Action recognition based on 3D skeleton data has attracted much attention due to its wide application,and it is one of the most popular research topics in computer *** 3D skeleton data is an effective representation of motion dynamics and is not easily affected by light,scene variation,*** research on action recognition has mainly focused on video or RGB data *** recent years,the advantages of combining skeleton data and deep learning have been gradually demonstrated,many impressive methods have been proposed,especially GCN‐based *** this survey,we first introduce the development process of 3D skeleton‐data action recognition and the classification of graph convolutional network,then introduce the commonly used NTU RGB+D and NTU RGB+D 120 ***,a detailed review of existing variants of three mainstream technologies is provided based on deep learning and their perfor-mance was compared from three *** the best of our knowledge,this is the first research to integrate the research of GCN‐based method and its various evolutionary *** investigation of existing variants of research in action‐recognition task from different perspectives is made,a generic framework is described,state‐of‐theart practices are summarized,and the emerging trends of this topic are explored.

关键词： Deep skeleton action

Visible-light-induced photocatalytic CO_(2)reduction over zirconium metal organic frameworks modified with different functional groups

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第10期132卷 22-30页

作者： Yuexian Du Guang’an jie Huilin jia jiahui Liu jieyu Wu Yanghe Fu Fumin Zhang Weidong zhu Maohong Fan Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhua 321004China Zhejiang Engineering Laboratory for Green Syntheses and Applications of Fluorine-Containing Specialty Chemicals Institute of Advanced Fluorine-Containing MaterialsZhejiang Normal UniversityJinhua 321004China Department of Chemical and Petroleum Engineering University of WyomingLaramieWY 82071USA

The reduction of CO_(2)into high value-added chemicals and fuels by a photocatalytic technology can relieve energy shortages and the environmental problems caused by greenhouse *** the current work,an amino-functionalized zirconium metal organic framework(Zr-MOF)was covalently modified with different functional groups via the condensation of Zr-MOF with 2-pyridinecarboxaldehyde(PA),salicylaldehyde(SA),benzaldehyde(BA),and trifluoroacetic acid(TA),named Zr-MOF-X(X=PA,SA,BA,and TA),respectively,through the post-synthesis *** with Zr-MOF and Zr-MOF-TA,the introduction of PA,SA,or BA into the framework of Zr-MOF can not only enhance the visible-light harvesting and CO_(2)capture,but also accelerate the photogenerated charge separation and transfer,thereby improving the photocatalytic ability of Zr-MOF for CO_(2)*** results indicate that the modification of Zr-MOF with electron-donating groups can promote the photocatalytic CO_(2)***,the current work provides an instructive approach to improve the photocatalytic efficiency of CO_(2)reduction through the covalent modification of MOFs.

关键词： Photocatalysis CO_(2)reduction Metal organic frameworks Post-synthesis modification Electric effect

A generalizable, data-driven online approach to forecast capacity degradation trajectory of lithium batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第5期31卷 548-555页

作者： Xinyan Liu Xue-Qiang Zhang Xiang Chen Gao-Long zhu Chong Yan jia-Qi Huang Hong-jie Peng Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

Estimating battery degradation is vital not only to monitor battery’s state-of-health but also to accelerate research on new battery chemistries. Herein, we present a data-driven approach to forecast the capacity fading trajectory of lab-assembled lithium batteries. Features with physical meanings in addition to predictive abilities are extracted from discharge voltage curves, enabling online prediction for a single cell with only its historical data. The robustness and generalizability allow for the demonstration on a compromised quality dataset consisting of batteries varying in battery architectures and cycling conditions,with superior accuracy for end of life and degradation trajectory prediction with average errors of 8.2%and 2.8%, respectively. Apart from the impressive prediction accuracy, the as-extracted features also provide physical insights, the incorporation of which into material design or battery operation conditions further enlightens the development of better batteries. We highlight the effectiveness of time-seriesbased techniques in forecasting battery cycling performance, as well as the huge potential of datadriven methods in unveiling hidden correlations in complicated energy chemistries such as lithium metal batteries.

关键词： Battery prognosis Machine learning Time series forecasting Online prediction Lithium metal batteries

A fine-grained access control model for relational databases

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第8期11卷 575-586页

作者： jie SHI Hong zhu College of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

Fine-grained access control (FGAC) must be supported by relational databases to satisfy the requirements of privacy preserving and Internet-based *** much work on FGAC models has been conducted,there are still a number of ongoing *** propose a new FGAC model which supports the specification of open access control policies as well as closed access control policies in relational *** negative authorization is supported,which allows the security administrator to specify what data should not be accessed by certain ***,multiple policies defined to regulate user access together are also *** definition and combination algorithm of multiple policies are thus ***,we implement the proposed FGAC model as a component of the database management system (DBMS) and evaluate its *** performance results show that the proposed model is feasible.

关键词： Fine-grained access control Database security Prohibition Multiple policies

Alginate Composite Hydrogel Bead with Multilayer Flake Structure for Dye Adsorptions

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2019年第10期7卷 983-996页

作者： Xiaoyu Chen jie zhu School of Material Engineering Jinling Institute of TechnologyNanjing211169China

With the rapid development of textile industry,a large amount of dye-contaminated effluents was produced and caused serious environmental *** remove the dye from effluents,adsorption materials have been applied because of their relatively cheap,high efficiency,and easy *** this study,a novel composite hydrogel bead with unique multilayer flake structure was fabricated by alginate,acrylamide and attapulgite for dye *** was grafted polymerization onto alginate to obtain alginate-g-poly(acrylamide).Then alginate-g-poly(acrylamide)was cross-linked by Ca2+ions in present of attapulgite to form composite hydrogel *** electron microscopy(SEM)results show that the freeze dried composite hydrogel bead has multilayer flake structure incorporating *** transform infrared spectroscopy(FTIR)and Thermo-gravimetric analysis(TGA)results indicate that acrylamide has been successfully grafted polymerization on sodium *** polymerization of acrylamide onto sodium alginate obviously enhances the swelling of hydrogel *** of attapulgite into hydrogel bead effectively enhances the adsorption capacity to methylene blue and the maximum adsorption capacity is 155.7 mg *** flake structure increases the adsorption area for methylene blue,but hinders the diffusion of methylene blue into the inner of composite hydrogel *** pH solution is beneficial to the ***-second order model and Fraundlinch model best describe the adsorption kinetic and isotherm,*** results indicate that composite hydrogel bead is a promising adsorption material for dye-contaminated water treatment.

关键词： Composite hydrogel attapulgite alginate acrylamide methylene blue adsorption material

Influence of process control agents on the performance of Ni_3Al by mechanical alloying

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2008年第6期27卷 648-651页

作者： LIAN Jiqiong MENG jie jia Chengchang School of Materials Science and Engineering University of Science and Technology Betting Beijing 100083 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The influence of process control agents （PCAs） on the mechanical properties of Ni3AI intermetallic compounds by mechanical alloying was investigated in order to develop oxide deposition reinforced intermetallics. The PCAs in mechanical alloying were pure ligroin, 75 vol.% ligroin ＋ 25 vol.% alcohol, 50 vol.% ligroin ＋ 50 vol.% alcohol, 25 vol.% ligroin ＋ 75 vol.% alcohol, and pure alcohol. The normal composition is Ni-22.9at.%Al-0.5at.%B, the ball-to-powder weight ratio is 10：1, and the milling time is 30 min. Then, the powders were sintered by spark plasma sintering under 40 MPa for 5 min at 1000℃. The results show that a higher bending strength and a higher hardness were obtained when the PCAs were 75% ligroin ＋ 25% alcohol in mechanical alloying. The bending strength is about 2700 MPa and the hardness （HV） is more than 6 GPa.

关键词： intermetallic compounds mechanical properties mechanical alloying process control agent spark plasma sintering

Hepatic perivascular epithelioid cell tumors:The importance of preoperative diagnosis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第13期30卷 1926-1933页

作者： Shuai Yan jia-jie Lu Lin Chen Wei-Hua Cai Jin-zhu Wu Department of Medical School Nantong UniversityNantong 226300Jiangsu ProvinceChina Department of Hepatobiliary Surgery Affiliated Nantong Hospital 3 of Nantong UniversityNantong 226006Jiangsu ProvinceChina Nantong Institute of Liver Disease Affiliated Nantong Hospital 3 of Nantong UniversityNantong 226006Jiangsu ProvinceChina

Accurate preoperative diagnosis is highly important for the treatment of perivascular epithelioid cell tumors(PEComas)because PEComas are mainly benign tumors and may not require surgical *** analyzing the causes,properties and clinical manifestations of PEComas,we summarize the challenges and solutions in the diagnosis of PEComas.

关键词： Hepatic perivascular epithelioid cell tumors Liver Preoperative diagnosis Angiomyolipomas Mesenchymal tissue-derived tumors

Multipurpose speech watermarking based on multistage vector quantization of linear prediction coefficients

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2007年第4期14卷 64-69页

作者： CHEN Ning zhu jie Department of Electronic Engineering Shanghai Jiao Tong UniversityShanghai 200030 China

To make speech watermarking achieve both copyright protection and integrity verification, a novel multipurpose speech watermarking algorithm based on the multistage vector quantization （MSVQ） of linear prediction coefficients （LPCs） is presented in this article. The property of natural speech that the vector quantization （VQ） indices of the LPCs amongst neighboring frames tend to be very similar is utilized to embed the robust watermark in the indices of the first-stage VQ（VQ1）. Then, the semi-fragile watermark is embedded in the indices of the second-stage VQ（VQ2） with index constrained VQ encoding scheme. Both the robust watermark and the semi-fragile watermark can be extracted without host speech. Simulation results verify the effectiveness of the proposed algorithm in terms of robustness and semi-fragility.

关键词： multipurpose speech watermarking LPCs MSVQ

Multi-instance learning for software quality estimation in object-oriented systems:a case study

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第2期11卷 130-138页

作者： Peng HUANG jie zhu Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China

We investigate a problem of object-oriented (OO) software quality estimation from a multi-instance (MI) perspective. In detail,each set of classes that have an inheritance relation,named 'class hierarchy',is regarded as a bag,while each class in the set is regarded as an instance. The learning task in this study is to estimate the label of unseen bags,i.e.,the fault-proneness of untested class hierarchies. A fault-prone class hierarchy contains at least one fault-prone (negative) class,while a non-fault-prone (positive) one has no negative class. Based on the modification records (MRs) of the previous project releases and OO software metrics,the fault-proneness of an untested class hierarchy can be predicted. Several selected MI learning algorithms were evalu-ated on five datasets collected from an industrial software project. Among the MI learning algorithms investigated in the ex-periments,the kernel method using a dedicated MI-kernel was better than the others in accurately and correctly predicting the fault-proneness of the class hierarchies. In addition,when compared to a supervised support vector machine (SVM) algorithm,the MI-kernel method still had a competitive performance with much less cost.

关键词： Object-oriented (OO) software Multi-instance (MI) learning Software quality estimation Kernel methods