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A Novel Method for Flatness Pattern Recognition via Least Squares Support Vector Regression

Journal of Iron and Steel research International 2012年第3期19卷 25-30页

作者： ZHANG Xiu-ling, ZHANG Shao-yu, TAN Guang-zhong, ZHAO Wen-bao (Key Laboratory of Industrial computer Control engineering of Hebei Province, national engineering research center for Equipment and technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, Hebei, China) Key Laboratory of Industrial Computer Control Engineering of Hebei Province National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University Qinhuangdao 066004 Hebei China

To adapt to the new requirement of the developing flatness control theory and technology, cubic patterns were introduced on the basis of the traditional linear, quadratic and quartic flatness basic patterns. Linear, quadratic, cubic and quartic Legendre orthogonal polynomials were adopted to express the flatness basic patterns. In order to over- come the defects live in the existent recognition methods based on fuzzy, neural network and support vector regres- sion （SVR） theory, a novel flatness pattern recognition method based on least squares support vector regression （LS-SVR） was proposed. On this basis, for the purpose of determining the hyper-parameters of LS-SVR effectively and enhan- cing the recognition accuracy and generalization performance of the model, particle swarm optimization algorithm with leave-one-out （LOO） error as fitness function was adopted. To overcome the disadvantage of high computational complexity of naive cross-validation algorithm, a novel fast cross-validation algorithm was introduced to calculate the LOO error of LDSVR. Results of experiments on flatness data calculated by theory and a 900HC cold-rolling mill practically measured flatness signals demonstrate that the proposed approach can distinguish the types and define the magnitudes of the flatness defects effectively with high accuracy, high speed and strong generalization ability.

关键词： flatness pattern recognition least squares support vector regression cross-validation

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Certified randomness using a trapped-ion quantum processor

arXiv

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arXiv 2025年

作者： Liu, Minzhao Shaydulin, Ruslan Niroula, Pradeep DeCross, Matthew Hung, Shih-Han Kon, Wen Yu Cervero-Martín, Enrique Chakraborty, Kaushik Amer, Omar Aaronson, Scott Acharya, Atithi Alexeev, Yuri Berg, K. Jordan Chakrabarti, Shouvanik Curchod, Florian J. Dreiling, Joan M. Erickson, Neal Foltz, Cameron Foss-Feig, Michael Hayes, David Humble, Travis S. Kumar, Niraj Larson, Jeffrey Lykov, Danylo Mills, Michael Moses, Steven A. Neyenhuis, Brian Eloul, Shaltiel Siegfried, Peter Walker, James Lim, Charles Pistoia, Marco Global Technology Applied Research JPMorganChase New YorkNY10017 United States Quantinuum BroomfieldCO80021 United States Computational Science Division Argonne National Laboratory LemontIL60439 United States Department of Physics The University of Chicago ChicagoIL60637 United States Department of Computer Science The University of Texas at Austin AustinTX78712 United States Department of Electrical Engineering National Taiwan University Taipei City10617 Taiwan Quantinuum Terrington House 13–15 Hills Road CambridgeCB2 1NL United Kingdom Quantum Science Center Oak Ridge National Laboratory Oak RidgeTN37831 United States Mathematics and Computer Science Division Argonne National Laboratory LemontIL60439 United States

While quantum computers have the potential to perform a wide range of practically important tasks beyond the capabilities of classical computers [1, 2], realizing this potential remains a challenge. One such task is to use an untrusted remote device to generate random bits that can be certified to contain a certain amount of entropy [3]. Certified randomness has many applications [4] but is fundamentally impossible to achieve solely by classical computation. In this work, we demonstrate the generation of certifiably random bits using the 56-qubit Quantinuum H2-1 trapped-ion quantum computer accessed over the internet. Our protocol leverages the classical hardness of recent random circuit sampling demonstrations [5, 6]: a client generates quantum "challenge" circuits using a small randomness seed, sends them to an untrusted quantum server to execute, and verifies the server’s results. We analyze the security of our protocol against a restricted class of realistic near-term adversaries. Using classical verification with measured combined sustained performance of 1.1 × 1018 floating-point operations per second across multiple supercomputers, we certify 71, 313 bits of entropy under this restricted adversary and additional assumptions. Our results demonstrate a step towards the practical applicability of today’s quantum computers. Copyright © 2025, The Authors. All rights reserved.

关键词： Quantum computers

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Agent-based simulations: Designing interior layout of an emporium for emergency evacuation

Agent-based simulations: Designing interior layout of an emp...

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2013 IEEE Conference Anthology, ANTHOLOGY 2013

作者： Duan, Wei Fan, Zhongcheng Meng, Rongqing Qiu, Xiaogang Research Center of Military Computational Experiments and Parallel Systems Technology College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China

ISBN: (纸本)9781479916603

We use agent-based simulations to study emergency evacuation in buildings, and design the interior layout of buildings. We build an abstract scene for the first floor of an emporium in Changsha city in China. The scene includes eight rooms and various objects. We build grid-based environmental models and heterogeneous agent models. Then we conduct simulation experiments to evaluate the performance of two scenes for emergency evacuation, initial scene and optimized scene. Through statistic analysis, we conclude that optimized scene performs better for emergency evacuation than initial scene. © 2013 IEEE.

关键词： Risk management

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SWPFOPLD: A Profiling and Optimizing Loader for SW26010Pro Processors 8

SWPFOPLD: A Profiling and Optimizing Loader for SW26010Pro P...

引用

8th International Conference on computer and Communication Systems, ICCCS 2023

作者： Qian, Hong Wu, Wei Zhu, Qi Wang, Fei Zhao, Jinwei Zheng, Yan School of Computer Science and Technology University of Science and Technology of China Hefei China Jiangnan Institute of Computing Technology System Software Research Department Wuxi China Tsinghua University Department of Computer Science and Technology Beijing China National Research Center of Parallel Computer Engineering and Technology Beijing China

ISBN: (纸本)9781665456128

The Sunway family supercomputers have achieved a series of remarkable achievements. However, the toolchains provided by them are not perfect, which has brought great challenges to the development of high-performance application software. In this paper, a profiling and optimizing tool is proposed to assist people to analyze and optimize the performance of their programs. SWPFOPLD is independent of the application program and gathers the runtime performance data through the PMUs, an automatically hot functions rearrange optimization based on the performance data is furtherly accomplished. The evaluation shows that SWPFOPLD can be easily and effectively used to analyze and optimize the performance of the application programs. © 2023 IEEE.

关键词： Supercomputers

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An optimal on-demand scrubbing solution for read disturbance errors in phase-change memory

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IEIE Transactions on Smart Processing and Computing 2021年第1期10卷 55-60页

作者： Kim, Moonsoo Lee, Juhan Kim, Hyun Lee, Hyuk-Jae Department of Electrical and Computer Engineering Seoul National University Seoul Korea Republic of Department of Electrical and Information Engineering Research Center for Electrical and Information Technology Seoul National University of Science and Technology Seoul Korea Republic of

Phase-change memory is a promising technology due to its attractive properties. However, phase-change memory is difficult to commercialize because of its reliability issues. A read disturbance error, which is the main cause of reliability issues, occurs when a cell is repeatedly read. A conventional solution for read disturbance errors is periodically scrubbing the cells. However, this method requires read counters to count the number of reads per word. This paper proposes an on-demand scrubbing solution that does not require read counters, which significantly reduces resource overhead. The proposed method observes the number of errors in a word using error-correcting code. If the number of errors is larger than a pre-defined threshold, scrubbing is performed to fix the errors. The proposed method removes nearly 1GB of hardware overhead required by read counters, and fixes more than 99.99% of read disturbance errors. © 2021 The Institute of Electronics and Information Engineers

关键词： Phase change memory

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A simulation analysis of reliability in primary storage deduplication

A simulation analysis of reliability in primary storage dedu...

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2016 IEEE International Symposium on Workload Characterization, IISWC 2016

作者： Fu, Min Lee, Patrick P. Feng, Dan Chen, Zuoning Xiao, Yu Wuhan National Lab for Optoelectronics School of Computer Huazhong University of Science and Technology Wuhan China Dept. of Computer Science and Engineering Chinese University of Hong Kong Hong Kong Hong Kong National Engineering Research Center for Parallel Computer Beijing China

ISBN: (纸本)9781509038954

Deduplication has been widely used to improve storage efficiency in modern primary and secondary storage systems, yet how deduplication fundamentally affects storage system reliability remains debatable. This paper aims to analyze and compare storage system reliability with and without deduplication in primary workloads using real-world file system snapshots. Specifically, we propose a trace-driven, deduplicationaware simulation framework that analyzes data loss in both chunk and file levels due to sector errors and whole-disk failures. Compared to without deduplication, our analysis shows that deduplication consistently reduces the damage of sector errors due to intra-file redundancy elimination, but potentially increases the damages of whole-disk failures if the highly referenced chunks are not carefully placed on disk. To improve reliability, we examine a deliberate copy technique that stores and repairs first the most referenced chunks in a small dedicated physical area (e.g., 1% of the physical capacity), and demonstrate its effectiveness through our simulation framework. © 2016 IEEE.

关键词： Storage efficiency

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Cloud computing oriented network operating system and service platform

Cloud computing oriented network operating system and servic...

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2011 9th IEEE International Conference on Pervasive Computing and Communications Workshops, PERCOM Workshops 2011

作者： Yin, Jianwei Ye, Yanming Wu, Bin Chen, Zuoning College of Computer Science Zhejiang University Hangzhou China National Parallel Computing Engineering Research Center Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781612849379

In recent years, cloud computing sweeps the world and becomes the new direction for future network applications. The traditional operating systems lack constructivity and evolvability, support less for the application perception and multi-core platform so that they cannot satisfy the requirements of cloud computing applications well. So the development of next-generation cloud-oriented network operating system is very significant. In this position paper, we first explained the background of the new network operating system. Then we listed some existing cloud computing operating systems. After describing the challenges that the project meets, we proposed the prototype architecture. We also discussed some key technologies and elaborated the expected typical scenario of developing and deploying applications in the proposed system. © 2011 IEEE.

关键词： Cloud computing

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5 ExaFlop/s HPL-MxP Benchmark with Linear Scalability on the 40-Million-Core Sunway Supercomputer 23

5 ExaFlop/s HPL-MxP Benchmark with Linear Scalability on the...

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2023 International Conference for High Performance Computing, Networking, Storage and Analysis, SC 2023

作者： Lin, Rongfen Yuan, Xinhui Xue, Wei Yin, Wanwang Yao, Jienan Shi, Junda Sun, Qiang Song, Chaobo Wang, Fei National Research Center of Parallel Computer Engineering & Technology Beijing China Tsinghua University BNRist Beijing China Qinghai University Xining China Tsinghua University Beijing China

ISBN: (纸本)9798400701092

HPL-MxP is an emerging high performance benchmark used to measure the mixed-precision computing capability of leading supercomputers. In this work, we present our efforts on the new Sunway that linearly scales the benchmark to over 40 million cores, sustains an overall mixed-precision performance exceeding 5 ExaFlop/s, and achieves over 85% of peak performance, which is the highest efficiency reached among all heterogeneous systems on the HPL-MxP list. The optimizations of our HPL-MxP implementation include the following: (1) a Two-Direction Look-Ahead and Overlap algorithm that enables overlaps of all communications with computation;(2) a multi-level process-mapping and communication scheduling method that uses the entire network as best as possible while maintaining conflict-free algorithm-flow;and (3) a CG-Fusion computing framework that eliminates up to 60% of inter-chip communications and removes the memory access bottleneck while serving both computation and communication simultaneously. This work could also provide useful insights for tuning cutting-edge applications on Sunway supercomputers as well as other heterogeneous supercomputers. © 2023 Owner/Author(s).

关键词： Linear algebra

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Malicious Reconfigurable Intelligent Surfaces: Security Threats in 6G Networks

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IEEE Internet of Things Journal 2025年

作者： Khalid, Waqas Chien, Trinh Van Khan, Wali Ullah Kaleem, Zeeshan Zikria, Yousaf Bin Kim, Taejoon Yu, Heejung Korea University Institute of Industrial Technology Sejong 30019 South Korea Hanoi University of Science and Technology School of Information and Communications Technology Hanoi 100000 Viet Nam University of Luxembourg Interdisciplinary Centre for Security Reliability and Trust (SnT) Luxembourg City 1855 Luxembourg King Fahd University of Petroleum and Minerals (KFUPM) Department of Computer Engineering Interdisciplinary research center for Smart mobility and Logistics Dhahran 31261 Saudi Arabia Institute of International Studies (TIIS) Sydney 2000 NSW Australia Chungbuk National University School of Information and Communication Engineering Cheongju 28644 South Korea Korea University Department of Electronics and Information Engineering Sejong 30019 South Korea

Reconfigurable intelligent surfaces (RISs) are emerging as a transformative technology for sixth-generation (6G) wireless networks. They enable dynamic manipulation of the propagation environment to enhance signal coverage, mitigate interference, and improve spectral and energy efficiencies. However, this flexibility introduces significant security vulnerabilities when RISs are maliciously controlled. This study explores the threats posed by such RISs, focusing on their potential to compromise the security and integrity of 6G networks. From an adversarial perspective, we analyze key attack vectors, including sophisticated jamming attacks that disrupt communication, eavesdropping attacks that intercept communications, and pilot contamination attacks that impair channel estimation accuracy, all contributing to severe performance degradation. For each attack, we detail the underlying mechanisms and adversarial optimization strategies designed to maximize impact. A case study quantifies the practical effects of these malicious RIS-based attacks in a simulated 6G network scenario. This research emphasizes the critical need for robust defense mechanisms and proposes essential research directions to address the evolving threats from malicious RISs, ensuring the security of 6G networks. © 2014 IEEE.

关键词： eavesdropping attacks jamming attacks Malicious reconfigurable intelligent surface (RIS) pilot contamination attacks sixth-generation (6G)

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Motion Stability Analysis of Non-sinusoidal Oscillation of Mold Driven by Servomotor

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Chinese Journal of Mechanical engineering 2015年第6期28卷 1269-1276页

作者： YAO Yunfeng LI Junxia FANG Yiming School of Materials Science and Engineering Hebei University of Science and Technology Key Laboratory of Material Near-net Forming Technology of Hebei Province Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University National Engineering Research Center for Equipment and Technology of Cold Strip Rolling

The investments of the electro-hydraulic servo system of the mold non-sinusoidal oscillator are great, the modification ratio of the mechanical type is unable to be adjusted online, and some continuous casters suffer from server resonance during the casting. A mold non-sinusoidal oscillation mechanism driven by servomotor is proposed and the prototype is produced in the lab, the investment is low and the modification ratio is can be adjusted online, and the stability problem is studied. At first the dynamics model of the servomotor non-sinusoidal oscillation is established, and the kinematics differential function is deduced. Furthermore, based on the harmonic balance method, the eigenvalues of the system are solved; the criterion of the stability of the system is put forward. In addition, the eigenvalues and harmonic with different oscillating parameters are analyzed. Analytical results show that the real parts of the eigenvalues are positive, the system will be unstable, and the resonance will occur when the positive real parts of the eigenvalues are extremum. A foundation is established for solving the running smooth problem and next application of this mechanism.

关键词： continuous casting mold non-sinusoidal oscillation servomotor stability resonance

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