检索结果-内蒙古大学图书馆

IEEE/ACM SC2004 Conference - Bridging Communities

作者： Ke, Jian Burtscher, Martin Speight, Evan Computer Systems Laboratory School of Electrical and Computer Engineering Cornell University Ithaca NY 14853 Future Systems Group IBM Austin Research Lab. Austin TX 78758

ISBN: (纸本)0769521533

Communication-intensive parallel applications spend a significant amount of their total execution time exchanging data between processes, which leads to poor performance in many cases. In this paper, we investigate message compression in the context of large-scale parallel messagepassing systems to reduce the communication time of individual messages and to improve the bandwidth of the overall system. We implement and evaluate the cMPI message-passing library, which quickly compresses messages on-the-fly with a low enough overhead that a net execution time reduction is obtained. Our results on six large-scale benchmark applications show that their execution speed improves by up to 98% when message compression is enabled. © 2004 IEEE.

关键词： Data compression

来源：评论

学校读者我要写书评

暂无评论

Transient Performance Evaluation of Assembly systems with Bernoulli Machines

引用

IFAC-PapersOnLine 2015年第3期48卷 88-93页

作者： Jia, Zhiyang Zhang, Liang Arinez, Jorge Xiao, Guoxian Department of Electrical and Computer Engineering University of Connecticut Storrs CT 06269 United States Manufacturing Systems Research Lab General Motors RandD Center Warren MI 48090 United States

Assembly systems are widely used in large volume manufacturing processes, where the final product requires several components. However, investigations of assembly systems have been relatively limited. Moreover, among existing results on assembly systems, most are focused on steady state performance, while transient behavior of such systems remains largely unexplored. In this paper, we study the problem of performance evaluation of assembly systems during transients. Specifically, we assume all machines in the system follow the Bernoulli reliability model and the buffers are of finite capacities. Then, an effective and computationally efficient algorithm for transient performance evaluation in Bernoulli assembly systems is developed and formulas for estimating the real-time production rate, consumption rates, work-in-process, and probabilities of machine starvation and blockage, during transients, are derived. The accuracy of the algorithm is demonstrated using numerical experiments. Finally, the method is extended to complex assembly system structures. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Transient analysis

来源：评论

学校读者我要写书评

暂无评论

Secondary Frequency Control of Decoupled Trigonometric Saturated Droop Controller for Islanded Low-Voltage Mesh Microgrid with Linear Load 13

Secondary Frequency Control of Decoupled Trigonometric Satur...

引用

13th International Conference on Power, Energy and Electrical engineering, CPEEE 2023

作者： Alghobari, Mohammed Alhussainy, Abdullah Ali Alghamdi, Sultan Rawa, Muhyaddin Abusorrah, Abdullah King Abdulaziz University K. A. Care Energy Research and Innovation Center Department of Electrical and Computer Engineering Jeddah21589 Saudi Arabia King Abdulaziz University K. A. Care Energy Research and Innovation Center Smart Grids Research Group Center of Research Excellence in Renewable Energy and Power Systems Department of Electrical and Computer Engineering Jeddah21589 Saudi Arabia King Abdulaziz University Smart Grids Research Group Center of Research Excellence in Renewable Energy and Power Systems Department of Electrical and Computer Engineering Jeddah21589 Saudi Arabia

ISBN: (纸本)9781665490146

This paper presents a robust secondary frequency control integrated with decoupled trigonometric saturated droop controller (DTSDC). The primary frequency controller may induce an error in frequency regulation, which affects the load sharing accuracy among microgrid distributed generators (DGs). Therefore, a centralized secondary controller is designed to converge the frequency to its nominal value for grid-forming inverters. Using an advanced communication channel, the proposed primary and secondary controller can primarily restore the frequency during disturbances, such as DG on/off switching and loading system variation. The practicality and performance of the proposed controller have been demonstrated with MATlab simulation environment on a mesh microgrid system consisting of four parallel DGs-based inverters. Simulation results show the proposed controller's robustness in the microgrid frequency stability. Hence, it achieves accurate active power sharing with a linear load. Moreover, the impact of resistive and inductive line impedance is discussed in this study. A comparison between the microgrid centralized controller (MGCC) and the decoupled trigonometric saturated droop controller (DTSDC) only is conducted to show the robustness of the presented controller performance. © 2023 IEEE.

关键词： Distributed power generation

来源：评论

学校读者我要写书评

暂无评论

Boosting multi-demographic federated learning for chest x-ray analysis using general-purpose self-supervised representations

arXiv

引用

arXiv 2025年

作者： Lotfinia, Mahshad Tayebiarasteh, Arash Samiei, Samaneh Joodaki, Mehdi Arasteh, Soroosh Tayebi Department of Diagnostic and Interventional Radiology University Hospital RWTH Aachen Aachen Germany Department of Computer Engineering Hamedan University of Technology Hamedan Iran Quantitative Cell Dynamics and Translational Systems Biology University Hospital RWTH Aachen Aachen Germany Institute for Computational Genomics Joint Research Center for Computational Biomedicine University Hospital RWTH Aachen Aachen Germany Pattern Recognition Lab Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Germany Department of Urology Stanford University StanfordCA United States Department of Radiology Stanford University StanfordCA United States

Reliable artificial intelligence (AI) models for medical image analysis often depend on large and diverse labeled datasets. Federated learning (FL) offers a decentralized and privacy-preserving approach to training but struggles in highly non-independent and identically distributed (non-IID) settings, where institutions with more representative data may experience degraded performance. Moreover, existing large-scale FL studies have been limited to adult datasets, neglecting the unique challenges posed by pediatric data, which introduces additional non-IID variability. To address these limitations, we analyzed n=398,523 adult chest radiographs from diverse institutions across multiple countries and n=9,125 pediatric images, leveraging transfer learning from general-purpose self-supervised image representations to classify pneumonia and cases with no abnormality. Using state-of-the-art vision transformers, we found that FL improved performance only for smaller adult datasets (P © 2025, CC BY.

关键词： Federated learning

来源：评论

学校读者我要写书评

暂无评论

Object matching using feature aggregation over a frame sequence

Object matching using feature aggregation over a frame seque...

引用

2011 IEEE Workshop on Applications of computer Vision, WACV 2011

作者： Bassiouny, Mahmoud El-Saban, Motaz Computer and Systems Engineering Department Faculty of Engineering Alexandria University Egypt Cairo Microsoft Innovation Lab. Microsoft Research Cairo Egypt

ISBN: (纸本)9781424494965

Object instance matching is a cornerstone component in many computer vision applications such as image search, augmented reality and unsupervised tagging. The common flow in these applications is to take an input image and match it against a database of previously enrolled images of objects of interest. This is usually difficult as one needs to capture an image corresponding to an object view already present in the database, especially in the case of 3D objects with high curvature where light reflection, viewpoint change and partial occlusion can significantly alter the appearance of the captured image. Rather than relying on having numerous views of each object in the database, we propose an alternative method of capturing a short video sequence scanning a certain object and utilize information from multiple frames to improve the chance of a successful match in the database. The matching step combines local features from a number of frames and incrementally forms a point cloud describing the object. We conduct experiments on a database of different object types showing promising matching results on both a privately collected set of videos and those freely available on the Web such that on YouTube. Increase in accuracy of up to 20% over the baseline of using a single frame matching is shown to be possible. © 2010 IEEE.

关键词： Database systems

来源：评论

学校读者我要写书评

暂无评论

A survey on hyperspectral image restoration: from the view of low-rank tensor approximation

引用

Science China(Information Sciences) 2023年第4期66卷 33-63页

作者： Na LIU Wei LI Yinjian WANG Ran TAO Qian DU Jocelyn CHANUSSOT School of Information and Electronics and Beijing Key Laboratory of Fractional Signals and Systems Beijing Institute of Technology Department of Electrical and Computer Engineering Mississippi State University GIPSA-Lab University of Grenoble Alpes Aerospace Information Research Institute Chinese Academy of Sciences

The ability to capture fine spectral discriminative information enables hyperspectral images(HSIs) to observe, detect and identify objects with subtle spectral discrepancy. However, the captured HSIs may not represent the true distribution of ground objects and the received reflectance at imaging instruments may be degraded, owing to environmental disturbances, atmospheric effects, and sensors' hardware limitations. These degradations include but are not limited to complex noise, heavy stripes, deadlines,cloud/shadow occlusion, blurring and spatial-resolution degradation, etc. These degradations dramatically reduce the quality and usefulness of HSIs. Low-rank tensor approximation(LRTA) is such an emerging technique, having gained much attention in the HSI restoration community, with an ever-growing theoretical foundation and pivotal technological innovation. Compared to low-rank matrix approximation(LRMA),LRTA characterizes more complex intrinsic structures of high-order data and owns more efficient learning abilities, being established to address convex and non-convex inverse optimization problems induced by HSI restoration. This survey mainly attempts to present a sophisticated, cutting-edge, and comprehensive technical survey of LRTA toward HSI restoration, specifically focusing on the following six topics: denoising, fusion,destriping, inpainting, deblurring, and super-resolution. For each topic, state-of-the-art restoration methods are introduced, with quantitative and visual performance assessments. Open issues and challenges are also presented, including model formulation, algorithm design, prior exploration, and application concerning the interpretation requirements.

关键词： hyperspectral image image restoration low-rank tensor approximation multisource fusion remote sensing

来源：评论

学校读者我要写书评

暂无评论

Adaptive scheduling for shared window joins over data streams

引用

中国高等学校学术文摘·计算机科学 2007年第4期1卷 468-477页

作者： JIN Cheqing ZHOU Aoying Jeffrey Xu Yu Joshua Zhexue Huang CAO Feng Department of Computer Science and Engineering East China University of Science and TechnologyShanghai 200237China Department of Computer Science and Engineering Fudan UniversityShanghai 200433China Department of Systems Engineering and Engineering Management The Chinese University of Hong KongChina E-Business Technology Institute The University of ttong KongChina IBM China-Research Lab Beijing 100094China

Recently a few Continuous Query systems have been developed to cope with applications involving continuous data *** the same time,numerous algorithms are proposed for better performance.A recent work on this subject was to define scheduling strategies on shared window joins over data streams from multiple query *** these strategies,a tuple with the highest priority is selected to process from multiple ***,the performance of these static strategies is deeply influenced when data are bursting,because the priority is determined only by static information,such as the query windows,arriving order,*** this paper,we propose a novel adaptive strategy where the priority of a tuple is integrated with realtime information.A thorough experimental evaluation has demonstrated that this new strategy can outperform the existing strategies.

关键词： data streams continuous query shared window joins

来源：评论

学校读者我要写书评

暂无评论

Discontinuous stochastic forcing in Greenland ice core data

arXiv

引用

arXiv 2025年

作者： Riechers, Keno Morr, Andreas Lehnertz, Klaus Lind, Pedro G. Boers, Niklas Witthaut, Dirk Gorjão, Leonardo Rydin Climate Physics Max Planck Institute for Meteorology Germany Earth System Modelling School of Engineering & Design Technical University of Munich Germany Research Domain IV – Complexity Science Potsdam Institute for Climate Impact Research Potsdam14473 Germany Department of Epileptology University of Bonn Medical Center Bonn53105 Germany Helmholtz Institute for Radiation and Nuclear Physics University of Bonn Bonn53115 Germany Interdisciplinary Centre for Complex Systems University of Bonn Bonn53175 Germany Department of Computer Science OsloMet – Oslo Metropolitan University Oslo0130 Norway OsloMet Artificial Intelligence lab OsloMet Oslo0166 Norway Global Systems Institute Department of Mathematics University of Exeter United Kingdom Jülich52428 Germany Institute for Theoretical Physics University of Cologne Köln50937 Germany Faculty of Science and Technology Norwegian University of Life Sciences Ås1432 Norway

Paleoclimate proxy records from Greenland ice cores, archiving e.g. δ18O as a proxy for surface temperature, show that sudden climatic shifts called Dansgaard–Oeschger events (DO) occurred repeatedly during the last glacial interval. They comprised substantial warming of the Arctic region from cold to milder conditions. Concomitant abrupt changes in the dust concentrations of the same ice cores suggest that sudden reorganisations of the hemispheric-scale atmospheric circulation have accompanied the warming events. Genuine bistability of the North Atlantic climate system is commonly hypothesised to explain the existence of stadial (cold) and interstadial (milder) periods in Greenland. However, the physical mechanisms that drove abrupt transitions from the stadial to the interstadial state, and more gradual yet still abrupt reverse transitions, remain debated. Here, we conduct a one-dimensional data-driven analysis of the Greenland temperature and atmospheric circulation proxies under the purview of stochastic processes. We take the Kramers–Moyal equation to estimate each proxy’s drift and diffusion terms within a Markovian model framework. We then assess noise contributions beyond Gaussian white noise. The resulting stochastic differential equation (SDE) models feature a monostable drift for the Greenland temperature proxy and a bistable one for the atmospheric circulation proxy. Indicators of discontinuity in stochastic processes suggest to include higher-order terms of the Kramers–Moyal equation when modelling the Greenland temperature proxy’s evolution. This constitutes a qualitative difference in the characteristics of the two time series, which should be further investigated from the standpoint of climate dynamics. © 2025, CC BY-NC-SA.

关键词： Stochastic systems

来源：评论

学校读者我要写书评

暂无评论

The Truncated Cone Effect in AFM Nanoindentation on Soft Materials

引用

Micro and Nanosystems 2023年第2期15卷 153-158页

作者： Kontomaris, Stylianos-Vasileios Malamou, Anna Department of Research and Development BioNanoTec LTD Nicosia Cyprus Faculty of Engineering and Architecture Metropolitan College Athens Greece Radar Systems and Remote Sensing Lab of the School of Electrical & Computer Engineering of National Technical University of Athens Athens Greece

Background: Atomic Force Microscopy (AFM) nanoindentation is the principal method for the characterization of soft materials at the nanoscale. In most cases, pyramidal tips are used and approximated to perfect cones. However, the extended use of the AFM tip may alter its sharp-ness. Objective: In many cases, a truncated cone shape is appropriate for tip modeling. In this technical note, the equation that relates the force with the indentation depth when indenting an elastic half-space using a truncated cone is derived. Methods: The nanoindentation equation for a truncated cone tip is derived using the fundamental differential equation that relates the sample’s contact stiffness with Young’s modulus. Results: When fitting Sneddon’s equation (which is valid for a perfect cone) on data obtained using a truncated cone-shaped AFM tip, the results show a ‘pseudo-softening’ behavior. Conclusion: The AFM tip's sharpness in nanoindentation experiments is a crucial parameter for obtaining the correct mechanical patterns of unknown samples. © 2023 Bentham Science Publishers.

关键词： Biological materials

来源：评论

学校读者我要写书评

暂无评论

A New Handwritten Essay Dataset for Automatic Essay Scoring with A New Benchmark 5

A New Handwritten Essay Dataset for Automatic Essay Scoring ...

引用

5th International Conference on Algorithms, Computing and Artificial Intelligence, ACAI 2022

作者： Hu, Shiyu Yang, Qichuan Yang, Yibing School of Computer and Information Engineering Henan University of Economics and Law ZhengZhou Henan China Smart Education Lenovo Research Beijing China AI Lab Lenovo Research Beijing China

ISBN: (纸本)9781450398343

The study of algorithms for Automatic Essay Scoring (AES) currently is motivated by textual essay-scoring datasets constructed by anonymous teachers from schools. We propose VisEssay, the first essay-scoring dataset containing handwriting images. VisEssay consists of over 13,000 visual essays originating from 25+ professional in-service teachers whose personal scoring accuracy are recorded by his/her scoring history, together with crowdsourced OCR result per handwriting image. VisEssay differs from the many existing AES datasets because 1) handwriting images are captured from non-native speakers with complementary essay types for existing datasets, 2) teachers scoring these essays are with personal profiles and score accuracy, and 3) corresponding text is checked to keep the consistency. Evaluation of modern algorithms for AES and text classification reveals that the proposed VisEssay is a challenging dataset. In the cause of encouraging a larger community to develop more generalized educational algorithms, we introduce three novel AES systems together with VisEssay and analysis the result as a new benchmark. © 2022 ACM.

关键词： Classification (of information)

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：