检索结果-南通市图书馆

Short-Term Power Load Forecasting with Hybrid TPA-BiLSTM Prediction Model Based on CSSA

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2023年第7期136卷 749-765页

作者： Jiahao Wen zhijian Wang School of Information Science Guangdong University of Finance and EconomicsGuangzhouChina

Since the existing prediction methods have encountered difficulties in processing themultiple influencing factors in short-term power load forecasting,we propose a bidirectional long short-term memory(BiLSTM)neural network model based on the temporal pattern attention(TPA)***,based on the grey relational analysis,datasets similar to forecast day are ***,thebidirectional LSTM layermodels the data of thehistorical load,temperature,humidity,and date-type and extracts complex relationships between data from the hidden row vectors obtained by the BiLSTM network,so that the influencing factors(with different characteristics)can select relevant information from different time steps to reduce the prediction error of the ***,the complex and nonlinear dependencies between time steps and sequences are extracted by the TPA mechanism,so the attention weight vector is constructed for the hidden layer output of BiLSTM and the relevant variables at different time steps are weighted to influence the ***,the chaotic sparrow search algorithm(CSSA)is used to optimize the hyperparameter selection of the *** short-term power load forecasting on different data sets shows that the average absolute errors of short-termpower load forecasting based on our method are 0.876 and 4.238,respectively,which is lower than other forecastingmethods,demonstrating the accuracy and stability of our model.

关键词： Chaotic sparrow search optimization algorithm TPA BiLSTM short-term power load forecasting grey relational analysis

Sufficient conditions and limitations of equivalent partition in multiagent controllability

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

Science China(Information Sciences) 2022年第3期65卷 152-166页

作者： Junhao GUO zhijian JI Yungang LIU Shandong Key Laboratory of Industrial Control Technology Institute of Complexity ScienceCollege of Automation Qingdao University School of Control Science and Engineering Shandong University

The emergence of the graphical characterization of multiagent controllability has raised several issues concerning how to directly establish controllability from topology structures. Arguably, one of the most serious challenges to this research field is the means through which equivalent partition, which plays an important role in graphical characterization, obtains sufficient controllability conditions; hence, how equivalent partition influences controllability has garnered considerable attention. This article specifically focuses on the sufficient conditions and limitations of equivalent partition in multiagent controllability. We provide two sufficient conditions:(i) the absence of the system matrix’s eigenvectors that make the equation formed by the eigenvalues and eigenvectors hold and(ii) the addition of leaders by reducing the same number of followers. The first condition particularly exhibits a relation between two apparently unrelated parts: Tao’s equation and controllability. We further propose a necessary and sufficient condition for controllability under n-node graphs(n 5) by taking advantage of iso-neighbor nodes, and analyze the resulting difficulties when n is greater than 5. Immediate corollaries of our results are obtained. Finally, we reveal the limitation of equivalent partition in controllability analysis. Several constructive examples demonstrate our results.

关键词： multiagent system controllability equivalent partition Tao’s equation graph theory

同方期刊数据库

Novel structural designs of 3D-printed osteogenic graft for rapid angiogenesis

在线全文

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2023年第1期6卷 51-73页

作者： Weiying Lu Yang Shi zhijian Xie Stomatology Hospital School of StomatologyZhejiang University School of MedicineZhejiang UniversityHangzhou 310006China Key Laboratory of Oral Biomedical Research of Zhejiang Province Zhejiang UniversityHangzhou 310006China Cancer Center Zhejiang UniversityHangzhou 310006China Zhejiang Provincial Clinical Research Center for Oral Diseases Zhejiang UniversityHangzhou 310006China

Large bone defect regeneration has always been recognized as a challenging clinical problem due to the difficulty of *** treatments exhibit certain inherent disadvantages(e.g.,secondary injury,immunization,and potential infections).However,three-dimensional(3D)printing technology as an emerging field can serve as an effective approach to achieve satisfactory revascularization while making up for the above limitations.A wide variety of methods can be used to facilitate blood supply during the design of a 3D-printed ***,the scaffold structure lays a foundation for the entire printing object;any method to promote angiogenesis can be effective only if it is based on well-designed *** this review,different designs related to angiogenesis are summarized by collecting the literature from recent *** 3D-printed scaffolds are classified into four major categories and discussed in detail,from elementary porous scaffolds to the most advanced bone-like ***,structural design suggestions to achieve rapid angiogenesis are proposed by analyzing the above *** review can provide a reference for organizations or individual academics to achieve improved bone defect repair and regeneration using 3D printing.

关键词： 3D printing Angiogenesis Bone regeneration Tissue engineering Biomimetic scaffolds

维普期刊数据库

Graph partitions and the controllability of directed signed networks

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2019年第4期62卷 100-110页

作者： Xianzhu LIU zhijian JI Ting HOU Institute of Complexity Science College of Automation and Electrical Engineering Qingdao University School of Mathematics and Statistics Qingdao University College of Mathematics and Systems Science Shandong University of Science and Technology

This paper studies the controllability problem of signed networks which is presented by weighted and directed signed graphs. Graph partitions such as structural balance and almost equitable partitions(AEPs) are studied. We generalize the definition of AEPs to any graphs, directed or undirected, signed or unsigned, with or without edge weights. Based on AEP theory, a graph-theoretic necessary condition is proposed for the controllability of directed signed networks and an algorithm is given for the computation of the coarsest partition. Besides, the upper bound on the controllable subspace is derived when the system is uncontrollable.

关键词： controllability signed networks graph partition almost equitable partitions structural balance

Zn_(0.5)Co_(0.5)Mn_(0.5)Fe_(0.5)Al_(0.5)Mg_(0.5)O_(4) high-entropy oxide with high capacity and ultra-long life for Li-ion battery anodes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2023年第1期12卷 59-71页

作者： Shun LI zhijian PENG Xiuli FU State Key Laboratory of Information Photonics and Optical Communications School of Integrated CircuitsBeijing University of Posts and TelecommunicationsBeijing 100876China School of Science China University of GeosciencesBeijing 100083China

Owing to the robust Li-ion storage properties induced by entropy stabilization effect,transition metal(TM)-based high-entropy oxides(HEOs)are promising electrode materials for highperformance Li-ion batteries(LIBs).In this study,a six-component Zn_(0.5)Co_(0.5)Mn_(0.5)Fe_(0.5)Al_(0.5)Mg_(0.5)O_(4) spinel-structured HEO(denoted as 6M-HEO,where M=Zn,Co,Mn,Fe,Al,and Mg)was synthesized using a facile coprecipitation *** used as an anode of the LIBs,its stable high-entropy nanostructures exhibit high specific capacity(290 mAh·g^(−1) at a current density of 2 A·g^(−1)),ultra-long cycling stability(maintained 81%of the initial capacity after 5000 cycles),and outstanding rate *** excellent performance can be attributed to two ***,its high-entropy structure can reduce the stress caused by intercalation and avoid volume expansion of the HEO *** a result,the cyclic stability was significantly ***,owing to the unique element selection in this study,four active elements(Zn,Co,Mn,and Fe)were incorporated in inactive MgO and Al2O3 matrice after the first discharge process,which would allow such high-entropy materials to withstand the rapid shuttle of Li ions.

关键词： coprecipitation method high-entropy oxide(HEO) Li-ion batteries(LIBs) anode

Big data compression processing and verification based on Hive for smart substation

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 Modern Power Systems and Clean Energy 2015年第3期3卷 440-446页

作者： zhijian QU Ge CHEN School of Electrical&Electronic Engineering East China Jiaotong UniversityNanchang 330013China

The capacity and the scale of smart substation are expanding constantly,with the characteristics of information digitization and automation,leading to a quantitative trend of *** at the existing processing shortages in the big data processing,the query and analysis of smart substation,a data compression processing method is proposed for analyzing smart substation and *** results show that the compression ratio and query time of RCFile storage format are better than those of TextFile and *** query efficiency is improved for data compressed by Deflate,Gzip and Lzo compression *** results verify the correctness of adjacent speedup defined as the index of cluster *** also prove that the method has a significant theoretical and practical value for big data processing of smart substation.

关键词： Hive Smart substation Lossless compression

Enhancing Differential Evolution with Commensal Learning and Uniform Local Search

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

Chinese Journal of Electronics 2017年第4期26卷 725-733页

作者： PENG Hu WU zhijian DENG Changshou State Key Laboratory of Software Engineering School of Computer Wuhan University School of Information Science and Technology Jiujiang University

Differential evolution(DE) is a popular and powerful evolutionary algorithm for global optimization problems. However, the combination of mutation strategies and parameter settings of DE is problem dependent and choosing the suitable one is a challenge work and timeconsuming. In addition, the deficiency in local exploitation also has a significant influence on the performance of *** order to solve these problems, a DE variant with Commensal learning and uniform local search(CUDE) has been proposed in this paper. In CUDE, commensal learning is proposed to adaptively select optimal mutation strategy and parameter setting simultaneously under the same criteria. Moreover, uniform local search enhances exploitation ability. Comprehensive experiment results on all the CEC2013 test suite and comparison with the state-of-the-art DE variants indicate that the CUDE is very competitive.

关键词： Differential evolution Commensal learn ing Uniform local search Global optimization

Area operator on Bergman spaces

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2006年第7期49卷 987-1008页

作者： WU zhijian Department of Mathematics the University of Alabama Tuscaloosa AL 35487 USA

We characterize the non-negative measuresμ on the unit disk D for which the area operator Aμ is bounded from Bergman space Aαp to Lq ((δ)D).

关键词： area operators, Bergman spaces, Carleson measures.

维普期刊数据库

INFLUENCE OF MAGNETIC FIELD ON ACCURACY OF ECM BY CHANGING THE CONDUCTIVITY OF ANODE FILM

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2008年第4期21卷 11-14页

作者： FAN zhijian ZHANG Lixin TANG lin School of Mechatronic Engineering Xi＇an Technological University Xi＇ an 710032 China

The change of conductivity, thickness and scanning electron microscopy （SEM） appearance of the anode film of CrWMn in 10% NaNO3 at different anode potential either with or without the magnetic field applied are investigated by testing film resistance, galvanostatic transient and using SEM to design magnetic circuit in magnetic assisted electrochemical machining （MAECM）. The experiments show that the anode film has semi-conducting property. Compared with the situation without magnetic field applied, the resistance of the film formed at 1 .SV （anode potential） increased and decreased at 4.0V while B=0.4T and the magnetic north pole points toward anode. The SEM photo demonstrates that the magnetic field will densify the film in the passivation area and quicken dissolution of the anode metal in over-passivation area. Based on the influence of magnetic field on electrochemical machining（ECM） due to the changes of the anode film conductivity behavior, the magnetic north pole should be designed to point towards the workpiece surface that has been machined. Process experiments agree with the results of test analysis.

关键词： Magnetic field Passive electrolyte Anode film Conductivity Magnetic assisted electrochemical machining(MAECM) Scanning electron microscopy(SEM)

维普期刊数据库