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元认知与二语/外语教学——Lawrence jun zhang教授访谈录

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当代外语研究 2016年第3期 16-19,93页

作者：孙强 Lawrence jun zhang 河南理工大学焦作454003 新西兰奥克兰大学

Lawrence jun zhang(张军)教授长期致力于二语习得和外语教学研究,其研究兴趣广泛。他在二语习得、双语教学、学习策略、阅读与写作教学和教师教育等诸多领域都有研究,尤其对元认知与外语教学颇感兴趣,并取得了丰硕的研究成果。TESOL国... 详细信息

Lawrence jun zhang(张军)教授长期致力于二语习得和外语教学研究,其研究兴趣广泛。他在二语习得、双语教学、学习策略、阅读与写作教学和教师教育等诸多领域都有研究,尤其对元认知与外语教学颇感兴趣,并取得了丰硕的研究成果。TESOL国际学会2011年度因此授予他"最佳科研论文奖"。本文就元认知的内涵意义及其与外语教学的关系访谈了张教授。访谈中,张教授简单回顾了元认知概念在认知心理学以及教育心理学的产生和发展,并且对元认知与二语习得和外语教学在国内外的发展现状进行了简单的总结,认为元认知在国内外发展迅速,学者们特别就元认知与外语学习效果之间的关系做了大量研究。最后,他就元认知与外语教学的未来发展提出建议,认为元认知与外语教学的研究不仅仅可以从认知和社会文化理论角度进行,还可以从动态系统理论视角展开。

关键词：元认知二语习得外语教学

Moment Redistribution Effect of the Continuous Glass Fiber Reinforced Polymer-Concrete Composite Slabs Based on Static Loading Experiment

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Structural Durability & Health Monitoring 2025年第1期19卷 105-123页

作者： Zhao-jun zhang Wen-Wei Wang Jing-Shui Zhen Bo-Cheng Li De-Cheng Cai Yang-Yang Du Hui Huang Offshore Oil Engineering Co.Ltd. Tianjin300461China Department of Bridge Engineering School of TransportationSoutheast UniversityNanjing211189China

This study aimed to investigate the moment redistribution in continuous glass fiber reinforced polymer(GFRP)-concrete composite slabs caused by concrete cracking and steel bar yielding in the negative bending moment *** experimental bending moment redistribution test was conducted on continuous GFRP-concrete composite slabs,and a calculation method based on the conjugate beam method was *** composite slabs were formed by combining GFRP profiles with a concrete layer and supported on steel beams to create two-span continuous composite slab *** methods,epoxy resin bonding,and stud connection,were used to connect the composite slabs with the steel *** experimental findings showed that the specimen connected with epoxy resin exhibited two moments redistribution phenomena during the loading process:concrete cracking and steel bar yielding at the internal *** contrast,the composite slab connected with steel beams by studs exhibited only one-moment redistribution phenomenon throughout the loading *** the concrete at the internal support cracked,the bending moment decreased in the internal support section and increased in the midspan *** the steel bars yielded,the bending moment further decreased in the internal support section and increased in the mid-span *** GFRP profiles do not experience cracking,there was no significant decrease in the bending moment of the mid-span *** test specimens experienced compressive failure of concrete at the mid-span *** results showed good agreement between the calculated and experimental values of bending moments in the mid-span section and internal support *** proposed model can effectively predict the moment redistribution behavior of continuous GFRP-concrete composite slabs.

关键词： Moment redistribution GFRP-concrete composite slabs bending moment experimental study analysis model

Update Chain-based Approach for Checking Route Oscillation of BGP

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Chinese Journal of Aeronautics 2011年第2期24卷 202-209页

作者： zhang jun School of Electronics and Information Engineering Beihang University Beijing 100191 China National Key Laboratory of CNS/ATM Beijing 100191 China

This paper presents a novel approach for checking route oscillation of border gateway protocol（BGP） quickly,by which the privacy of routing policies of autonomous system（AS） can be ***,route update chain tag（RUCT） is constructed to track the forwarding of update report,and local routing library is made to record the changing history of update *** route oscillation can be identified by analyzing correlative state of RUCT and local routing *** characteristic of this approach is that an arbitrary AS can check route oscillation alone only by sharing its network ID,which greatly respects the pri-vacy of routing policies for each *** paper shows that both looping in RUCT and consecutive positive-negative report in local record are sufficient conditions for route *** experiments demonstrate the availability and efficiency of the proposed approach.

关键词： routing protocols gateways border gateway protocol autonomous systems interdomain routing oscillations

XY-Type GPU Cache: Exploiting Spatial Localities in both X and Y Directions to Avoid Conflict Miss

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Chinese Journal of Electronics 2015年第1期24卷 88-95页

作者： zhang jun School of Information Science and Engineering Central South University Hunan Engineering Laboratory for Advanced Control and Intelligent Automation

Cache has been introduced into many Graphics processing units(GPUs) to decrease the frequency of data transfer between high-performance computing units and low-speed long-latency external *** traditional index mapping scheme designed originally for CPU cache exploits only the spatial locality in address space. The access to graphics data always has region locality on the frame buffer: there are high spatial localities in both X and Y directions. It may generate more conflict misses on some limited cache lines, which eventually results in high cache miss ratio and a performance *** CPU cache cannot be used directly in *** propose a new conflict-avoiding GPU cache called XY-type cache with a new index mapping scheme, whose cache line indices are computed from both X and Y coordinates of pixels and the cache index distribution is consistent with the region locality on the frame buffer. Our evaluation results show that the proposed XY-type GPU cache can reduce cache miss ratio by 88% at most via scattering the cache accesses to all lines evenly, and can completely avoid the bad effect caused by frame resolution. Since the cache miss ratio in direct-mapped or 2-way set-associative structure is approximate to or even lower than that in fully-associative structure which is the best case in terms of lowering cache line conflicts, XY-type GPU cache can be designed with lower complexity and lower consumption power.

关键词： XY-type GPU cache Conflict miss Spatial locality in XY directions Cache index mapping scheme.

Deep Guided Attention Network for Joint Denoising and Demosaicing in Real Image

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Chinese Journal of Electronics 2024年第1期33卷 303-312页

作者： Tao zhang Ying FU jun zhang School of Computer Science and Technology Beijing Institute of Technology Advanced Reasearch Institute of Multidisciplinary Science Beijing Institute of Technology

Denoising(DN) and demosaicing(DM) are the first crucial stages in the image signal processing pipeline. Recently, researches pay more attention to solve DN and DM in a joint manner, which is an extremely undetermined inverse problem. Existing deep learning methods learn the desired prior on synthetic dataset, which limits the generalization of learned network to the real world data. Moreover, existing methods mainly focus on the raw data property of high green information sampling rate for DM, but occasionally exploit the high intensity and signalto-noise(SNR) of green channel. In this work, a deep guided attention network(DGAN) is presented for real image joint DN and DM(JDD), which considers both high SNR and high sampling rate of green information for DN and DM, respectively. To ease the training and fully exploit the data property of green channel, we first train DN and DM sub-networks sequentially and then learn them jointly, which can alleviate the error accumulation. Besides, in order to support the real image JDD, we collect paired raw clean RGB and noisy mosaic images to conduct a realistic dataset. The experimental results on real JDD dataset show the presented approach performs better than the state-of-the-art methods, in terms of both quantitative metrics and qualitative visualization.

关键词： Training Visualization Inverse problems Green products Noise reduction Pipelines Signal processing

Effect of Au film pre-deposited at different durations as inner electrode on the electrical properties and interface microstructures of Na_2O-PbO-Nb_2O_5-SiO_2 multi-layer glass-ceramic capacitors

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Acta Metallurgica Sinica(English Letters) 2011年第6期24卷 449-456页

作者： jun ZHU jun LUO Qingmeng zhang jun DU Advanced Electronic Materials Institute General Research Institute for Nonferrous Metals Beijing 100088 China

To further study the effect of sputtered Au film as transition electrode layer on the electrical properties and interface microstructures of Na20-PbO-Nb2O5-SiO2 multilayer glass-ceramic capacitors, Au films pre-deposited at different time were prepared by DC magnetron sputtering. Compared with the single paste electrode structure, samples with Au films pre-deposited from 6 to 18 min have the consistent perfor- mance to effectively improve the electrical properties of the capacitors, resulting in the doubled breakdown strength, an increase of equivalent capacitance by 22% and a decrease of leakage current by an order of magnitude. SEM observations indicate that the Au films with deposition time from 6 to 18 min would all help the formation of a dense electrode/dielectric interface and inhibit the diffusion of Ag. The results reveal that Au film pre-deposited for 6 min as inner electrode was sufficient to improve the interface microstructure and therefore to inhibit the Ag diffusion and enhance the overall performance of the multi-layer glass-ceramic capacitors.

关键词： Inner electrode Deposition time Glass-ceramic Multi-layer capacitor

Experimental Study of Effects of One Kind of Tangentially Non-uniform Tip Clearance on the Flow Field at an Exit of a Compressor Cascade Passage

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Journal of Thermal Science 2010年第1期19卷 7-13页

作者： Hongwei MA Jinghui zhang jun zhang School of Jet Propulsion Beihang University Beijing 100191 China National Key Laboratory of Science and Technology on Aero-Engines Beijing 100191 China

This paper presents an experimental investigation of effects of one kind of tangentially non-uniform tip clearance on the flow field at an exit of a compressor cascade *** tests were performed in a low-speed large-scale cascade with the uniform tip clearance and the non-uniform *** three-dimensional flow field was measured at the exit at three incidence angles of 0°,5°,and 8° using a mini five-hole pressure *** measurement results show that the non-uniform tip clearance can moderate the leakage flow and blow down more low-energy fluids at the tip corner and decrease the accumulation of low-energy fluids which cause the flow blockage in the blade *** the meantime,the non-uniform clearance can weaken the tangential migration of the low-energy fluids in the endwall boundary layer and reduce the secondary loss and the flow blockage in the tip region.

关键词： compressor cascade clearance leakage flow secondary flow vortex

UNIFORMLY A POSTERIORI ERROR ESTIMATE FOR THE FINITE ELEMENT METHOD TO A MODEL PARAMETER DEPENDENT PROBLEM

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Journal of Computational Mathematics 2008年第5期26卷 716-727页

作者： Yiran zhang jun Hu LMAM and School of Mathematical Sciences Peking University Beijing 100871 China

This paper proposes a reliable and efficient a posteriori error estimator for the finite element methods for the beam problem. It is proved that the error can be bounded by the computable error estimator from above an... 详细信息

关键词： The beam problem A posteriori error estimator Finite element method.

Cooperative task assignment of multi-UAV system

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Chinese Journal of Aeronautics 2020年第11期33卷 2825-2827页

作者： jun zhang Jiahao XING School of Electronic and Information Engineering Beihang UniversityBeijing 100191China Key Laboratory of Advanced Technology of Near Space Information System(Beihang University) Ministry of Industry and Information Technology of ChinaBeijing 100191China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

With the rapid development of Unmanned Aerial Vehicle(UAV)technology,one of the emerging fields is to utilize multi-UAV as a team under autonomous control in a complex *** the challenges in fully achieving autonomous control,Cooperative task assignment stands out as the key *** this paper,we analyze the importance and difficulties of multiUAV cooperative task assignment in characterizing scenarios and obtaining high-quality ***,we present three promising directions for future research:Cooperative task assignment in a dynamic complex environment,in an unmanned-manned aircraft system and in a UAV *** goal is to provide a brief review of multi-UAV cooperative task assignment for readers to further explore.

关键词： Autonomous control Cooperative task assignment Intelligent operation Multi-UAV collaboration Unmanned aerial vehicles