检索结果-内蒙古大学图书馆

Global Emerging technology Blockchain Forum: Blockchain & Beyond (iGETblockchain), IEEE

作者： Chao Li Qiuyu Shen Cheng Xiang Bharath Ramesh Department of Electrical and Computer Engineering Advanced Control Technology Lab National University of Singapore Singapore International Center for Neuromorphic Systems The MARCS Institute for Brain Behaviour and Development Western Sydney University Sydney Australia

Nowadays, deep learning models can be trained on large amounts of web data on power hungry servers and be deployment-ready for specific real-world applications. With a state-of-the-art model architecture and a large publicly available dataset for pre-training, convolutional neural network models can be further fine-tuned via transfer learning for a related task. Nonetheless, the training process required of privacy-sensitive applications needs to protect data confidentiality and simultaneously boost performance using limited training data. For such data-deprived and privacy-centric learning, we introduce a trustless federated learning framework that seamlessly integrates deep learning models from different edge nodes using a blockchain-based architecture. Our framework performs federated learning without the need of a central server by leveraging a smart contract blockchain platform with a distributed file system for model storage. Users can locally train on their data while routinely benefiting from an enhanced model obtained by merging the models from all users in a decentralized fashion. Most importantly, this framework is free of the potential single point of failure in centralized federated learning. Besides, our framework has in-built incentive mechanisms to prevent model corruption and temper bad actors. We tested our framework on various computer vision datasets. The experimental results show that the merged model accuracy is on-par compared to a centralized federated training setup. To the best of our knowledge, this work represents the first systematic attempt at building a blockchain-based federated deep learning framework for computer vision. The code is publicly made available at: https://***/s-elo/DNN-Blockchain.

关键词： Deep learning Training Data privacy Federated learning Computational modeling Smart contracts Data models

来源：评论

学校读者我要写书评

暂无评论

Evolving Neuromorphic Systems on the Ethereum Smart Contract Platform

Evolving Neuromorphic Systems on the Ethereum Smart Contract...

引用

Global Emerging technology Blockchain Forum: Blockchain & Beyond (iGETblockchain), IEEE

作者： Hongchi Wu Binhao Fang Cheng Xiang Gregory Cohen André van Schaik Bharath Ramesh Department of Electrical and Computer Engineering Advanced Control Technology Lab National University of Singapore Singapore International Center for Neuromorphic Systems The MARCS Institute for Brain Behaviour and Development Western Sydney University Sydney Australia

Neuromorphic intelligent systems are motivated by the observation that biological organisms - from algae to primates - excel in swiftly sensing their environment, reacting promptly to its perils and opportunities. Furthermore, biological organisms function more resiliently than our most advanced machines, with a fraction of their power requirements. Taking inspiration from how primates and humans have successfully evolved higher cognitive intelligence within social constructs, this paper proposes neuromorphic systems to be built and governed on a public distributed ledger platform. However, following in the footsteps of generic AI research, neuromorphic benchmarks and algorithms are developed in isolation. Furthermore, as a relatively niche research field, there is limited access to the actual neuromorphic sensors and large publicly available curated data, exacerbating the slow research progress. Nonetheless, centralized neuromorphic datasets and algorithms pose a threat to secure closed-loop behavior and learning outcomes, both commonly modulated in biological organisms via social interactions. This paper makes the case for early adoption of distributed ledger technology by neuromorphic systems and benchmarks to avoid the pitfalls endured by AI research – showcasing competing event-based gesture recognition systems on the Ethereum smart contract platform. This shift towards real-world and dynamic systems on a distributed ledger platform will improve collaboration among neuromorphic researchers while enabling healthy competition via incentives. Smart contract protocols allow model behavior monitoring, setting new learning tasks and increase in baseline performance, and naturally provides a governance framework for evolving neuromorphic systems. The code is publicly made available at: https://***/BruceFang123.

关键词： Neuromorphics Distributed ledger Smart contracts Biological systems Benchmark testing Blockchains Sensors

来源：评论

学校读者我要写书评

暂无评论

Hierarchical Multi-Dimensional Mn2GeO4 Coupled with Cnt for Long-Cycling Lithium-Ion Battery

SSRN

引用

SSRN 2024年

作者： Chen, Xiao Qin, Yongji Feng, Xincai Yang, Shaoqing Wang, Hao Lian, Meiling Zhang, Dongxing Guo, Qiuquan Luo, Jun Yang, Jun Wang, Xinzhong Shenzhen Institute of Information Technology Shenzhen518172 China ShenSi Lab Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Longhua Shenzhen518110 China China National Coal Group Corporation Beijing100120 China Tianjin Engineering Research Center of Civil Aviation Energy Environment and Green Development School of Transportation Science and Engineering Civil Aviation University of China Tianjin300300 China Tianjin University of Technology China Western University Canada

Due to the increasing demand for renewable and sustainable energy sources, the development of energy storage technology is booming. Lithium-ion batteries (LIBs) are already a mature technology and play an important role in modern society, however, the scarcity of cobalt and lithium resources limits the wide practical applications. In this paper, the Mn2GeO4 based materials with different morphologies (such as one-dimensional nanowires, two-dimensional nanosheet and three-dimensional irregular nanoparticles) were successfully prepared through facile hydrothermal reaction or calcination. The experimental results showed that the electrochemical performances of two-dimensional Mn2GeO4 nanosheet (MGO-NS) sample were better than those of other two samples. Additionally, the MGO-NS was further modified by carbon nanotubes (CNTs) to form MGO-NS/CNT composite for enhanced stability. After electrochemical tests, it was found that the discharge specific capacity of the composite was 1847.9 mAh·g-1 in the first cycle. After 100 cycles, the specific capacity could still maintain at about 1001 mAh·g-1, and the charging platform was about 1.2 V. The reasons for performance improvement of MGO-NS/CNT were discussed. The related electrochemical reaction mechanism was analyzed by cyclic voltammetry (CV) test. All these results confirmed that MGO-NS/CNT was a promising lithium-ion anode material for future application. © 2024, The Authors. All rights reserved.

关键词： Germanium compounds

来源：评论

学校读者我要写书评

暂无评论

Fast Heuristic Algorithms for the Multiple Strip Packing Problem 1

引用

20th International Conference on Mathematical Optimization Theory and Operations Research , MOTOR 2021

作者： Vasilyev, Igor Ushakov, Anton V. Barkova, Maria V. Zhang, Dong Ren, Jie Chen, Juan Matrosov Institute for System Dynamics and Control Theory of SB RAS 134 Lermontov Street Irkutsk664033 Russia Algorithm and Technology Development Department Global Technical Service Department Huawei Technologies Co. Ltd. Dongguan China Moscow Advanced Software Technology Lab Huawei Russian Research Institute Moscow Russia

ISBN: (数字)9783030864330

ISBN: (纸本)9783030864323

In this paper we address the so-called two-dimensional Multiple Strip Packing Problem (MSPP). There is a set of rectangles and a set of strips, where each strip has a pre-defined width. The problem is to find a feasible packing of all the rectangles into the strips so as the maximal height of the packing over all the strips is minimized. A packing is feasible if all the rectangles are placed into the strips and not overlapped. In case of only one strip, the problem is widely known as the Strip Packing Problem (SPP). Many effective constructive heuristics for SPP are based on the so-called skyline representation of a packing pattern. We generalized this approach for the case of multiple strips and developed a randomized local search, which embeds the proposed skyline heuristic to compute the objective value for a packing. We also introduced the two-dimensional level multiple strip packing problem and developed some level-based constructive heuristics. We report computational results on real-life problem instances arisen in an application of MSPP in scheduling computing jobs on multiple Spark computer clusters. © 2021, Springer Nature Switzerland AG.

关键词： Heuristic algorithms

来源：评论

学校读者我要写书评

暂无评论

Structural regulation strategies towards high performance organic materials for next generation aqueous Zn-based batteries

引用

ChemPhysMater 2022年第2期1卷 86-101页

作者： Diyu Xu Haozhe Zhang Lijun Zhou Xingyuan Gao Xihong Lu MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry The Key Lab of Low-carbon Chem&Energy Conservation of Guangdong ProvinceSchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275China College of Chemistry and Material Science Engineering Technology Development Center of Advanced Materials&Energy Saving and Emission Reduction in Guangdong Colleges and UniversitiesGuangdong University of EducationGuangzhou 510303China School of Applied Physics and Materials Wuyi UniversityJiangmen 529020China

Environmental degradation has promoted the exploitation of novel energy-storage *** en-ergy technologies,including supercapacitors and aqueous batteries,are highly desirable for energy storage *** them,aqueous zinc-based batteries(AZBs)are highly valued because of their inherent safety and low *** class of emerging materials favorably employed in these devices are organic cathodes,featuring resource renewability,cost-effectiveness,and adjustable electrochemical properties via facile structural modi-fication compared to the conventional inorganic *** date,various types of organic compounds have been developed and applied to *** paper comprehensively reviews the mechanisms involved in organic electrode material reactions,highlighting the structural modifications,including morphological,molecular,func-tional group,crystal,and electronic structures,affecting the final device ***,the prospects of practical applications of zinc/organic aqueous battery are delineated.

关键词： Aqueous batteries Zn-based batteries Organic materials Structural regulation Morphological structure

来源：评论

学校读者我要写书评

暂无评论

Electroluminescent white quantum dot light-emitting diodes based on high pressure synthesis of graphitic C3N4 semiconductor

SSRN

引用

SSRN 2024年

作者： Chen, Lei Chen, Ping Liu, Fanghai Gao, Yanpeng Ni, Haiyong Han, Chaolei Hu, Juntao Zhang, Wenhua Zhang, Qiuhong Wei, Shizhong National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan Key Laboratory of High-temperature Structural and Functional Materials Henan University of Science and Technology Luoyang471003 China School of Materials Science and Engineering Hefei University of Technology Hefei230009 China Institute of Resources Utilization and Rare Earth Development Guangdong Academy of Sciences Guangzhou510650 China National Engineering Lab of Special Display Technology State Key Lab of Advanced Display Technology Academy of Opto-Electronic Technology Hefei University of Technology Hefei230009 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei230026 China Intelligent Manufacturing Institute of HFUT Anhui Province Hefei230051 China

Graphitic carbon nitride (g-C3N4) have shown promising potentials for quantum dot light-emitting diodes (QLEDs), which might be an effective alternative of the mostly used Cd(Se,S)/Zn(S,Se) emitting layers and can achieve both low toxicity and high stability, meeting the goal of sustainable development. Herein, we for the first report a white electroluminescence QLED device with blue and orange dual-color emissions, which were attributed to the σ*-LP, π*- π, and π*-LP transitions, respectively, from a single-compound g-C3N4 quantum dots (QDs) by synthesizing the precursor at 0.8 Mpa high-pressure N2. By selectively exciting the δ and π bonds with X-ray, the luminescence machanism was approved with the synchrotron radiation techniques of X-ray absorption near edge structure (XANES) and the X-ray excited optical luminescence (XEOL).The chromaticity coordinate changes from cayan color space with CIE (0.2034, 0.1939) to white color space with CIE (0.3009, 0.2697) as pressure increases from 0.06 to 0.8 Mpa, with the increased overlap of the δ* and π* orbital upon the contraction of crystal lattice. The breakthrough achieved in this work will promisingly promote the development of future white light sources as thin as paper for human home and office lighting by using direct current-driven electroluminescence of QDs, instead of photoluminescence of phosphors. © 2024, The Authors. All rights reserved.

关键词： Semiconductor quantum dots

来源：评论

学校读者我要写书评

暂无评论

Real-time bottleneck matching in spatial crowdsourcing

引用

Science China(Information Sciences) 2021年第8期64卷 233-234页

作者： Long LI Lingling WANG Weifeng LV State Key Laboratory of Software Development Environment (SKLSDE Lab) and Beijing Advanced Innovation Center for Big Data and Brain Computing (BDBC) Beihang University School of Management and Economics Beijing Institute of Technology

Dear editor,Spatial crowdsourcing(SC) services(e.g., Uber, DiDi, and Meituan) have become popular with smart-phone ***, the online matching problems in real-time spatial data are a key issue in SC [1–4]. Unlike the current one-sided online matching study in real-time spatial data [5], which focuses on minimizing the overall cost of the matching,

关键词： Real-time bottleneck matching in spatial crowdsourcing

来源：评论

学校读者我要写书评

暂无评论

K+-doped P crystals of NIR-upconverting NaYF4:Yb3+/Ho3+ conform to the ‘strain–intensity’ relationship

引用

CrystEngComm 2023年第24期25卷 3528-3538页

作者： Amreeta Swain Preeti Verma Manvendra Narayan Singh Parasmani Rajput Rajendra Sharma Supratim Giri Department of Chemistry National Institute of Technology Rourkela India Hard X-ray Applications Lab Accelerator Physics and Synchrotrons Utilization Division Raja Ramanna Centre for Advanced Technology Indore – 452013 India Beamline Development and Application Section Bhabha Atomic Research Centre Trombay Mumbai-400085 India Homi Bhabha National Institute Anushakti Nagar Mumbai-400094 India Technical Physics Division Bhabha Atomic Research Centre Trombay Mumbai-400085 India Centre for Nanomaterials National Institute of Technology Rourkela India

In the context of the strain-engineering of crystals, the recent observation of the ‘strain–intensity’ relationship holds an interesting premise for NIR-upconverting (UC) crystals involving a symmetry perturbing agent such as Li⁺. In this article, we aimed to examine whether the hypothesis for the ‘strain–intensity’ relationship can be applied in a general manner, i.e., irrespective of the chemical nature of the symmetry-perturbing alkali metal ion. We used the synchrotron X-ray diffraction (SXRD) experiments for an in-depth structural analysis on a series of β-NaYF₄:Yb³⁺/Ho³⁺-based UC crystals doped with increasing mol% of K⁺. Subsequent Rietveld analysis confirmed the formation of predominantly β-phase belonging to the P

space group up to a certain dopant mol% of K⁺ ion. The compressive-lattice strain, as computed from the SXRD data using the Williamson–Hall method, demonstrated a near-proportional relationship with the UC photoluminescence intensity under increasing K⁺ mol% within the P

phase. Such coherence could not be explained from the crystal morphologies or average structural traits, as obtained from TEM and Rietveld analysis. However, the EXAFS study revealed a possible existence of variation in the local structure in the same samples. To some extent, the observed ‘strain–intensity’ correlation was manifested in the electron density maps, reflective of the electronic imbalance across the P

samples. We found that even when

关键词：

来源：评论

学校读者我要写书评

暂无评论

Modulating p-type doping of two-dimensional material palladium diselenide

引用

Nano Research 2024年第4期17卷 3232-3244页

作者： Jiali Yang Yu Liu En-Yang Wang Jinbo Pang Shirong Huang Thomas Gemming Jinshun Bi Alicja Bachmatiuk Hao Jia Shu-Xian Hu Chongyun Jiang Hong Liu Gianaurelio Cuniberti Weijia Zhou Mark H Rümmeli Institute for Advanced Interdisciplinary Research(iAIR) University of JinanJinan 250022China Institute for Materials Chemistry Leibniz Institute for Solid State and Materials Research Dresden(IFW Dresden)20 Helmholtz StrasseDresden 01069Germany State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China College of Energy Soochow Institute for Energy and Materials Innovations Soochow UniversitySuzhou 215006China Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow UniversitySuzhou 215006China School of Integrated Circuits University of Chinese Academy of SciencesBeijing 101408China Institute of Microelectronics of Tianjin Binhai New Area Tianjin 300451China Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China Lukasiewicz Research Network PORT Polish Center for Technology DevelopmentStablowicka 147Wroclaw 54-066Poland School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China College of electronic information and optical engineering Nankai UniversityTianjin 300350China Centre of Polymer and Carbon Materials Polish Academy of SciencesM.Curie Sklodowskiej 34Zabrze 41-819Poland Center for Energy and Environmental Technologies VŠB-Technical University of Ostrava17.Listopadu 15Ostrava 70833Czech Republic State Key Laboratory of Crystal Materials Center of Bio&Micro/Nano Functional MaterialsShandong UniversityJinan 250100China Dresden Center for Computational Materials Science Technische Universität DresdenDresden 01062Germany Dresden Center for Intelligent Materials(GCL DCIM) Technische Universität DresdenDresden 01062Germany Institute for Materials Science and Max Bergmann Center of Biomaterials Technische Universität DresdenDresden 01069Germany Center for Advancing Electronics Dresden Technische Universität DresdenDresden 01069Germany

The van der Waals heterostructures have evolved as novel materials for complementing the Si-based semiconductor ***-10 noble metal dichalcogenides(e.g.,PtS_(2),PtSe_(2),PdS_(2),and PdSe_(2))have been listed into two-dimensional(2D)materials toolkit to assemble van der Waals *** them,PdSe_(2) demonstrates advantages of high stability in air,high mobility,and wide tunable ***,the regulation of p-type doping of PdSe_(2) remains unsolved problem prior to fabricating p–n junction as a fundamental platform of semiconductor ***,a quantitative method for the controllable doping of PdSe_(2) is yet to be *** this study,the doping level of PdSe_(2) was correlated with the concentration of Lewis acids,for example,SnCl_(4),used for *** the transfer characteristics,the threshold voltage(the gate voltage corresponding to the minimum drain current)increased after SnCl_(4) soaking ***_(2) transistors were soaked in SnCl_(4) solutions with five different *** threshold voltages from the as-obtained transfer curves were extracted for linear fitting to the threshold voltage versus doping concentration correlation *** study provides in-depth insights into the controllable p-type doping of PdSe_(2).It may also push forward the research of the regulation of conductivity behaviors of 2D materials.

关键词： two-dimensional(2D)materials Lewis acid treatment p-type doping field-effect transistors transfer characteristic

来源：评论

学校读者我要写书评

暂无评论

Nucleophilic hydrolysis of dichloroacetonitrile and trichloroacetonitrile disinfection byproducts by peroxymonosulfate: Kinetics and mechanisms

引用

Chemosphere 2024年 363卷 142875页

作者： Yu, Yangyi Li, Juan Zhou, Junhui Cao, Ying Guo, Qin Liu, Yongze Yang, Yi Jiang, Jin Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education School of Ecology Environment and Resources Guangdong University of Technology Guangzhou510006 China Advanced Interdisciplinary Institute of Environment and Ecology Guangdong Provincial Key Laboratory of Wastewater Information Analysis and Early Warning Beijing Normal University Zhuhai519087 China Beijing Key Lab for Sources Control Technology of Water Pollution Engineering Research Center for Water Pollution Source Control & Eco-remediation College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China University of Science and Technology of China Anhui 230026 China

In this work, it was found that peroxymonosulfate (PMS) could appreciably accelerate the transformation rates of dichloroacetonitrile (DCAN) and trichloracetonitrile (TCAN) in aqueous solutions, especially under alkaline pHs. The impact of reactive oxygen species scavengers (methyl alcohol for sulfate radical, tert-butyl alcohol for hydroxyl radical, and azide for singlet oxygen) and water matrices (chloride (Cl−), bicarbonate (HCO3−), and natural organic matter (NOM)) on DCAN and TCAN transformation by PMS is evaluated, revealing negligible effects. A nucleophilic hydrolysis pathway, as opposed to an oxidation process, was proposed for the transformation of DCAN and TCAN by PMS, supported by the hydrolyzable characteristics of these compounds and validated through density functional theory calculations. Kinetic analysis indicated that the transformation of DCAN and TCAN by PMS adhered to a second-order kinetic law, with higher reaction rates observed at elevated pH levels within the range of 7.0–10.0. Kinetic modeling incorporating the hydrolytic contributions of water, hydroxyl ion, and protonated and deprotonated PMS (i.e., HSO5− and SO52−) effectively fitted the experimental data. Species-specific second-order rate constants reveal that SO52− exhibited significantly higher reactivity towards DCAN ((1.69 ± 0.22) × 104 M−1h−1) and TCAN ((6.06 ± 0.18) × 104 M−1h−1) compared to HSO5− ((2.14 ± 0.12) × 102 M−1h−1) for DCAN;and (1.378 ± 0.11) × 103 M−1h−1 for TCAN). Comparative analysis of DCAN and TCAN transformation efficiencies by four different oxidants indicated that PMS rivaled chlorine but falls short of hydrogen peroxide, with peroxydisulfate displaying negligible reactivity. Overall, this study uncovers the nucleophilic hydrolysis characteristics of PMS, supplementing its recognized role as an oxidant precursor or mild oxidant, and underscores its significant implications for environmental remediation. © 2024 Elsevier Ltd

关键词： Sulfur compounds

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：