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16th IFIP WG 10.3 International Conference on Network and Parallel Computing, NPC 2019

作者： Xu, Chongyang Luan, Zhongzhi Gao, Lan Wang, Rui Zhang, Han Zhang, Lianyi Liu, Yi Qian, Depei Beihang University Beijing China Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing China

ISBN: (纸本)9783030307080

With the rapid development of deep learning (DL), various convolution neural network (CNN) models have been developed. Moreover, to execute different DL workloads efficiently, many accelerators have been proposed. To guide the design of both CNN models and hardware architectures for a high-performance inference system, we choose five types of CNN models and test them on six processors and measure three metrics. With our experiments, we get two observations and conduct two insights for the design of CNN algorithms and hardware architectures. © 2019, IFIP International Federation for Information Processing.

关键词： Neural network models

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Berry curvature induced linear electro-optic effect in chiral topological semimetals

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Physical Review B 2022年第12期105卷 125201-125201页

作者： Zhi Li Yuewen Gao Yu Gu Shengli Zhang Toshiaki Iitaka W. M. Liu MIIT Key Laboratory of Advanced Display Materials and Devices School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Discrete Event Simulation Research Team RIKEN Center for Computational Science 2-1 Hirosawa Wako Saitama 351-0198 Japan Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China

We studied the linear electro-optic effect of chiral topological semimetals which are characterized by high-fold chiral fermions separated in energy space. We identify that the general second-order conductivity σxyz(2)(ω) includes three sources from the shift current, injection current, and nonlinear anomalous current with frequency ω, respectively. The σxyz(2)(ω) contributed by the nonlinear anomalous current is antisymmetric under the exchange of indices x and y, and it is proportional to relaxation time and Chern number. We demonstrate that the electro-optic coefficient below 0.65 eV in chiral crystal RhSi is dominated by the nonlinear anomalous current and injection current, and it renders a relatively low half-wave voltage in the order of hundreds of volts. This work classifies how the Berry curvature modifies the linear electro-optic effect in chiral topological semimetals and opens an avenue to design the electro-optic modulator with half-wave voltage compatible with the complementary metal-oxide semiconductor circuit.

关键词： Nonlinear optics Optical conductivity Topological materials

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Modeling of service correlation for service composition in cloud manufacturing 31

Modeling of service correlation for service composition in c...

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31st European Modeling and simulation Symposium, EMSS 2019

作者： Wang, Fei Laili, Yuanjun Zhang, Lin Xing, Chi Guo, Liqin School of Automation Science and Electrical Engineering Beihang University China Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center China State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Engineering Beijing Simulation Center China Science and Technology on Space System Simulation Laboratory Beijing Simulation Center China

ISBN: (纸本)9788885741263

Cloud manufacturing (CMfg), integrating distributed manufacturing resources as services to cloud center, aims at intelligent, green, and economic customized manufacturing. The optimal composition of services to fulfill particular manufacturing requirement is a core issue to realize efficient cloud manufacturing. Many researchers have studied the problem considering the Quality-of-Service (QoS) of independent services. However, the correlation between services is rarely considered. In this paper, the importance of service correlation is emphasized. Two kinds of service correlation, service exclusion and service collaboration, are modeled for service composition. An improved algorithm DET, which combines Differential Evolution Algorithm (DE) with a Tabu table based on service exclusive and collaborative relationships, is designed to filter composable services and find better solutions for complex tasks. Experiments have shown the effects of service correlation on the quality of composed services and demonstrated the effectiveness of the proposed method DET compared with traditional DE. © 2019 Dime Universita di Genova, DIMEG University of Calabria.

关键词： Quality of service

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Global destabilization of drift-tearing mode with coupling to discretized electron drift-wave instability

arXiv

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arXiv 2024年

作者： Bao, J. Zhang, W.L. Lin, Z. Cai, H.S. Liu, D.J. Chen, H.T. Dong, C. Cao, J.T. Li, D. Beijing National Laboratory for Condensed Matter Physics CAS Key Laboratory of Soft Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China University of California IrvineCA92697 United States CAS Key Laboratory of Geospace Environment School of Nuclear Sciences and echnology University of Science and Technology of China Hefei230026 China College of Physical Science and Technology Sichuan University Chengdu610064 China Fusion Simulation Center Peking University Beijing100871 China

The global linear behaviors of m/n = 2/1 drift-tearing mode (DTM) in the collisional regime are investigated based on a concisely resistive drift-MHD model. Besides DTM, extra normal modes including electron drift-wave (EDW) and shear Alfvén wave (SAW) are coupled together and destabilized in different parameter regimes by considering resistivity in this system. The eigenvalue problem (EVP) approach is applied for solving the eigenstate spectra with the distribution of all unstable solutions on ωr-γ complex plane. It is found that in the small electron diamagnetic drift (EDD) frequency regime |ω∗n,e| ≤ γc (γc is the classical resistive-tearing mode (RTM) growth rate), DTM growth rate agrees well with local theory that is reduced with increasing EDD frequency. However, when EDD frequency exceeds a critical threshold |ω∗n,e| > |ωcrit*n,e| ∼ 2γc, the strongly linear coupling between DTM and other discretized EDW instabilities happens so that the free energies from current and pressure channels can be released together and thus enhance the DTM instability, of which growth rate increases with increasing EDD frequency and deviates from local theory qualitatively. Correspondingly, a cross-scale mode structure forms with mixed polarization, namely, δ perturbation is dominated by electrostatic polarized short-wavelength oscillation as EDW instability character, and δA|| perturbation remains typical tearing mode solution of Alfvénic polarized macroscopic structure. Within |ω∗n,e| > |ωcrit*n,e|, the additional ion diamagnetic drift (IDD) causes δ oscillating structure to shift towards small density gradient domain, which cancels the extra drive from ion channel and thus DTM growth rate is insensitive to IDD frequency. Compared to EDD effects, the IDD effect alone with zero-ω∗n,e only leads to the stabilization of RTM that shows agreements between global simulation and local theory, which is no longer the condition for DTM regime. These results are useful for clarifying the DTM

关键词： Shear flow

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Self-powered solar-blind photodiodes based on EFG-grown(100)-dominant β-Ga_(2)O_(3) substrate

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Chinese Physics B 2021年第1期30卷 483-486页

作者： Xu-Long Chu Zeng Liu Yu-Song Zhi Yuan-Yuan Liu Shao-Hui Zhang Chao Wu Ang Gao Pei-Gang Li Dao-You Guo Zhen-Ping Wu Wei-Hua Tang Laboratory of Information Functional Materials and Devices School of Science&State Key Laboratory of Information Photonics and Optical CommunicationsBeijing University of Posts and TelecommunicationsBeijing 100876China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China The Engineering Research Center for Semiconductor Integrated Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China China Aerospace System Simulation Technology Co. Ltd.(Beijing)Beijing 100195China Division of Interdisciplinary and Comprehensive Research&Platform for Characterization and Test Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Center for Optoelectronics Materials and Devices&Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210046China National and Local Joint Engineering Laboratory for RF Integration and Micro-Packing Technologies Nanjing University of Posts and TelecommunicationsNanjing 210046China

We report the edge-defined-film-fed(EFG)-grown β-Ga_(2)O_(3)-based Schottky *** device has a reverse leakage current of ~nA and a rectified ratio of ~10^(4) at ±5 *** addition,the photodiode detector shows a dark current of 0.3 pA,a photo-responsivity(R) of 2.875 mA/W,a special detectivity(D*) of 10^(10) Jones,and an external quantum efficiency(EQE) of 1.4% at zero bias,illustrating a self-powered *** work may advance the development of the Ga_(2)O_(3)-based Schottky diode solar-blind photodetectors.

关键词： β-Ga_(2)O_(3)substrate Schottky photodiode solar-blind detection

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Experimental study on age and gender differences in microscopic movement characteristics of students

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Chinese Physics B 2021年第9期30卷 633-642页

作者： Jiayue Wang Maik Boltes Armin Seyfried Antoine Tordeux Jun Zhang Wenguo Weng Public Order School People's Public Security University of ChinaBeijing 100038China Center for Capital Social Safety People's Public Security University of ChinaBeijing 100038China Public Security Behavioral Science Laboratory People's Public Security University of ChinaBeijing 100038China Institute for Advanced Simulation Forschungszentrum JülichJülich 52428Germany Faculty of Architecture and Civil Engineering University of WuppertalWuppertal 42119Germany School of Mechanical Engineering and Safety Engineering University of WuppertalWuppertal 42119Germany State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China Institute of Public Safety Research Department of Engineering PhysicsTsinghua UniversityBeijing 100084China

Campus security has aroused many concerns from the whole *** is one of the most frequent and influential accidents in *** on pedestrian dynamics especially focusing on students are essential for campus security,which are helpful to improve facility design and emergency evacuation *** this paper,primary and middle school students were recruited to participate in the single-file *** microscopic movement characteristics,including walking speed,headway,gait characteristics(step length,step frequency and swaying amplitude)and their relations were *** and gender differences in the headway-speed diagram and space requirements were analyzed by statistical *** results indicated that the impacts of age and gender were *** were three stages for the influence of gender on the headway-speed diagram for both age *** impacts on students'space requirements were consistent for different age and gender *** the impacts of age and gender on free-flow speed were affected by each *** to the connection of walking speed and gait characteristics,the comparisons of gait characteristics between different ages and genders were performed to understand the corresponding differences in speed more *** results showed that differences in step length and swaying amplitude between males and females were significant for both age *** effect of gender on step frequency was significant for primary *** for middle school students,whether gender had significant impact on step frequency was not clear here because of the large ***,the influence of age on gait characteristics changed with gender.

关键词： campus security microscopic movement characteristics pedestrian dynamics single-file movement experiments

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Parallel Optimization of Computational Fluid Dynamics Application code_saturne Based on Next Generation Sunway Supercomputer

Parallel Optimization of Computational Fluid Dynamics Applic...

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International Symposium on Parallel Architectures, Algorithms and Programming (PAAP)

作者： Anjun Liu Yin Liao Xihao Xu YanYan Chen Hongjun Zhong Jianming Wu Bo Kong Alexander Raikov Meng Guo Jinan Key Laboratory of High Performance Industrial Software Jinan Institute of Supercomputing Technology Jinan China Jinan Supercomputing-Zhejiang Yuansuan Industrial Simulation System Joint Laboratory Zhejiang Yuansuan Technology Co. Ltd Hangzhou China Key Laboratory of Computing Power Network and Information Security Ministry of Education Shandong Computer Science Center (National Supercomputer Center in Jinan ) Qilu University of Technology (Shandong Academy of Sciences) Shandong Provincial Key Laboratory of Computer Networks Shandong Fundamental Research Center for Computer Science Jinan China

code_saturne is an open-source general large-scale computational fluid dynamics software independently developed by Electricite de France since 1997. Due to its high computing performance, code_saturne has been widely used in the nuclear industry, heavy fuel and biomass combustion, particle tracking and other computational fluid dynamics fields. In this work, we implemented code_saturne on the new generation Sunway supercomputer (SW26010pro) at the first time. By applying the data value-taking technology of double cache, combined with Sunway shared memory technology, we have adapted the data structure and Modular programming of code_saturne conducively to the new generation Sunway supercomputer (SW26010pro) and accelerated the software hotspots the software hotspots by 1–2 times. After optimizing and porting, this software has successfully served in the numerical simulation of the lateral flow of fuel assemblies in the nuclear industry.

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O2 plasma-modified carbon nanotube for sulfamethoxazole degradation via peroxymonosulfate activation: Synergism of radical and non-radical pathways boosting water decontamination and detoxification

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Chemosphere 2023年 344卷

作者： Liu, Shiqi Zhang, Zichen Lu, Rui Mao, Yuankun Ge, Huiru Liu, Can Tian, Chenxi Yin, Siyuan Feng, Li Liu, Yongze Chen, Chao Zhang, Liqiu Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Engineering Research Center for Water Pollution Source Control & Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Technical Center of Solid Waste and Chemicals Management Ministry of Ecology and Environment Beijin100029 China

Sulfamethoxazole (SMX), a widely used antibiotic, has triggered increasing attention due to its extensive detection in wastewater effluent, causing serious ecological threats. Herein, a carbon-based heterogeneous catalyst was developed by the O2 plasma-etching process, regulating oxygen-containing functional groups (OFGs) and defects of carbon nanotubes (O-CNT) to activate peroxymonosulfate (PMS) for highly efficient SMX abatement. Through adjusting the etching time, the desired active sites (i.e., C=O and defects) could be rationally created. Experiments collectively suggested that the degradation of SMX was owing to the contribution of synergism by radical (•OH (17.3%) and SO4•– (39.3%)) and non-radical pathways (1O2, 43.4%), which originated from PMS catalyzed by C=O and defects. In addition, the possible degradation products and transformation pathways of SMX in the system were inferred by combining the Fukui function calculations and the LC-MS/MS analysis. And the possible degradation pathway was effective in reducing the environmental toxicity of SMX, as evidenced by the T.E.S.T. software and the micronucleus experiment on Vicia faba root tip. Also, the catalytic system exhibited excellent performance for different antibiotics removal, such as amoxicillin (AMX), carbamazepine (CBZ) and isopropylphenazone (PRP). This study is expected to provide an alternative strategy for antibiotics removal in water decontamination and detoxification. © 2023 Elsevier Ltd

关键词： Carbon nanotubes

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Progress toward the sustainable development of world cultural heritage sites facing land-cover changes

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The Innovation 2023年第5期4卷 87-95页

作者： Huadong Guo Fulong Chen Yunwei Tang Yanbin Ding Min Chen Wei Zhou Meng Zhu Sheng Gao Ruixia Yang Wenwu Zheng Chaoyang Fang Hui Lin Ana Pereira Roders Francesca Cigna Deodato Tapete Bing Xu International Research Center of Big Data for Sustainable Development Goals Beijing 100094China Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijng 100094China International Centre on Space Technologies for Natural and Cultural Heritage Under the Auspices of UNESCO Beijing 100094China Cooperative Innovation Center for Digitalization of Cultural Heritage in Traditional Vllages and Towns Hengyang Normal UniversityHengyang 421010China School of Geography Nanjing Normal UniversityNanjing 210023China Key Laboratory of Poyang Lake Wetland and Watershed Research Ministry of Education&School of Geography and EnvironmentJiangxi Normal UniversityNanchang 330022China Faculty of Architecture and the Built Environment Delft University of Technology2600 AA Delftthe Netherlands Instiute of Atmospheric Sciences and Climate(SAC) National Research Council(CNR)Via del Fosso del Cavaliere 10000133 RomeItaly Italian Space Agency(ASI) Via del Politecnico snc00133 RomeItaly Department of Earth System Science Tsinghua UniversityBeijing 100084China

The quantification of the extent and dynamics of land-use changes is a key metric employed to assess the progress toward several Sustainable Development Goals(SDGs)that form part of the United Nations 2030 Sustainable Development *** terms of anthropogenic factors threatening the conservation of heritage properties,such a metric aids in the assessment of achievements toward heritage sustainability solving the problem of insufficient data ***,in this study,589 cultural World Heritage List(WHL)properties from 115 countries were analyzed,encompassing globally distributed and statistically significant samples of“monuments and groups of buildings”(73.2%),“sites”(19.3%),and“cultural landscapes”(7.5%).Land-cover changes in the WHL properties between 2015 and 2020 were automatically extracted from big data collections of high-resolution satellite imagery accessed via Google Earth Engine using intelligent remote sensing *** indexes(SIs)were estimated for the protection zones of each property,and the results were employed,for the first time,to assess the progress of each country toward SDG Target *** the apparent advances in SIs(10.4%),most countries either exhibited steady(20.0%)or declining(69.6%)SIs due to limited cultural investigations and enhanced negative anthropogenic *** study confirms that land-cover changes are among serious threats for heritage conservation,with heritage in some countries wherein the need to address this threat is most crucial,and the proposed spatiotemporal monitoring approach is recommended.

关键词： landscape heritage Engine

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Exploring Text-Guided Single Image Editing for Remote Sensing Images

arXiv

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arXiv 2024年

作者： Han, Fangzhou Si, Lingyu Dong, Hongwei Zhang, Lamei Chen, Hao Du, Bo The Department of Information Engineering Harbin Institute of Technology Harbin China The National Key Laboratory of Space Integrated Information System Institute of Software Chinese Academy of Sciences Beijing China The Hubei Luojia Laboratory National Engineering Research Center for Multimedia Software School of Computer Science Wuhan University Wuhan China

Artificial intelligence generative content (AIGC) has significantly impacted image generation in the field of remote sensing. However, the equally important area of remote sensing image (RSI) editing has not received sufficient attention. Deep learning based editing methods generally involve two sequential stages: generation and editing. During the generation stage, consistency in content and details between the original and edited images must be maintained, while in the editing stage, controllability and accuracy of the edits should be ensured. For natural images, these challenges can be tackled by training generative backbones on large-scale benchmark datasets and using text guidance based on vision-language models (VLMs). However, these previously effective approaches become less viable for RSIs due to two reasons: First, existing generative RSI benchmark datasets do not fully capture the diversity of remote sensing scenarios, particularly in terms of variations in sensors, object types, and resolutions. Consequently, the generalization capacity of the trained backbone model is often inadequate for universal editing tasks on RSIs. Second, the large spatial resolution of RSIs exacerbates the problem in VLMs where a single text semantic corresponds to multiple image semantics, leading to the introduction of incorrect semantics when using text to guide RSI editing. To solve above problems, this paper proposes a text-guided RSI editing method that is controllable but stable, and can be trained using only a single image. It adopts a multi-scale training approach to preserve consistency without the need for training on extensive benchmark datasets, while leveraging RSI pre-trained VLMs and prompt ensembling (PE) to ensure accuracy and controllability in the text-guided editing process. High-quality RSI editing results can be achieved by first applying multi-scale training to the target image, followed by text-guided fine-tuning using RSI pre-trained VLMs and PE. Experi

关键词： Semantics

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