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Applying system Thinking to Learn from Accident of Modern Automatic Control systems

Chinese Journal of Electronics 2014年第2期23卷 409-414页

作者： NIU Ru CAO Yuan GE Xiaocheng TANG Tao State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University School of Electronics and Information Engineering National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University Department of Computer Science University of York

Modern societies increasingly rely on automatic control systems. These systems are hardly pure technical systems; instead they are complex socio-technical systems, which consist of technical elements and social components. It is necessary to have a systematic approach to analyze these systems because it is growing evidence that accidents from these systems usually have complex causal factors which form an interconnected network of events,rather than a simple cause-effect chain. We take railway Train control systems(TCS) as an example to demonstrate the importance of the socio-technical approach to analyze the system. The paper presents an investigation of recent high-speed railway accident by applying STAMP – one of the most notable socio-technical system analysis techniques, outlines improvements to the system which could avoid similar accidents in the future. We also provide our valuable feedback for the use of STAMP.

关键词： Socio-technical automatic system Railway safety Accident analysis systems theoretic accident model and processes(STAMP)

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Energy aware cloud application management in private cloud data center

Energy aware cloud application management in private cloud d...

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2011 International Conference on Cloud and Service Computing, CSC 2011

作者： Xu, Li Tan, Guozhen Zhang, Xia Zhou, Jingang School of Computer Science and Technology Dalian University of Technology Dalian China State Key Laboratory of Software Architecture Neusoft Corporation Shenyang China

ISBN: (纸本)9781457716362

Cloud services decouple cloud applications from IT infrastructure in cloud environment. On demand resources provisioning pattern makes high efficient resource utility and application dynamic scaling possible. Hence Cloud data center could provide infrastructure capabilities in a more energy efficient way. However, there exists a tradeoff between energy efficiency and application service level objectives. It is challenging to realize effective energy consumption and energy efficiency aware autonomic cloud application service level agreement assurance mechanism. In this paper, we propose energy aware cloud application management architecture for private cloud data center. Furthermore we present a cloud application and power management model. In order to metering server energy utility efficiency and cloud applications' total energy consumption of running on a specific group of servers, we define related measurement metrics. The objective of our approach is to reduce data center's total energy efficiency by controlling cloud applications' overall energy consumption while ensuring cloud applications' service level agreement. The experiment results show that the cloud application energy consumption and energy efficiency is being improved effectively. © 2011 IEEE.

关键词： Energy utilization

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870fs, 448kHz pulses from an all-PM Yb-doped fiber laser with a nonlinear amplifying loop mirror

870fs, 448kHz pulses from an all-PM Yb-doped fiber laser wit...

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Conference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2018

作者： Liu, Guanyu Wang, Aimin Zhang, Zhigang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China

We demonstrate a mode locked long all-polarization maintaining fiber laser with a nonlinear amplifying loop mirror. 870 fs pulse is obtained at the repetition rate of 448 kHz. © OSA 2018

ISBN: (纸本)9781943580453

We demonstrate a mode locked long all-polarization maintaining fiber laser with a nonlinear amplifying loop mirror. 870 fs pulse is obtained at the repetition rate of 448 kHz. © OSA 2018

关键词： Pulse repetition rate

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GHz level fiber laser and frequency comb 11

GHz level fiber laser and frequency comb

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11th Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2015

作者： Zhang, Zhigang Wang, Amin Li, Chen Ma, Yuxuan State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China

The advanced laser technology has led to gigahertz level repetition rate femtosecond fiber laser possible. This laser offers advantages of high average power, chirp-free output pulses and helps the frequency comb made...

ISBN: (纸本)9781467371094

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Construction of Traditional Culture Ontology Based on Representation and Role 23

Construction of Traditional Culture Ontology Based on Repres...

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2023 4th International Conference on Control, Robotics and Intelligent system, CCRIS 2023

作者： Li, Min Xu, Jianliang Wu, Xiaoquan Ocean University of China Qingdao China State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Qingdao China

ISBN: (纸本)9798400708190

Traditional culture refers to a culture that has evolved from civilization and can reflect the characteristics and spirit of a nation. However, at present, the traditional cultural ontology only focuses on modeling and data organization of a certain type of traditional culture, which is a certain distance from the massive cultural information and urgent cultural needs. This article starts from the perspective of protecting and inheriting traditional culture, and based on representation, incorporates role theory to construct a cultural ontology centered on poetry, calligraphy, and painting. The traditional cultural ontology constructed in this article can further contribute to the field of artificial intelligence. © 2023 ACM.

关键词： Ontology

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Boosting the Restoring Performance of Deduplication Data by Classifying Backup Metadata

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ACM/IMS Transactions on Data Science 2021年第2期2卷 1–16页

作者： Yang, Ru Deng, Yuhui Zhou, Yi Huang, Ping Department of Computer Science Jinan University Guangzhou510632 China Department of Computer Science Jinan University China State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences China TSYS School of Computer Science Columbus State University Doimukh Georgia College of Engineering Temple University United States

Restoring data is the main purpose of data backup in storage systems. The fragmentation issue, caused by physically scattering logically continuous data across a variety of disk locations, poses a negative impact on the restoring performance of a deduplication system. Rewriting algorithms are used to alleviate the fragmentation problem by improving the restoring speed of a deduplication system. However, rewriting methods give birth to a big sacrifice in terms of deduplication ratio, leading to a huge storage space waste. Furthermore, traditional backup approaches treat file metadata and chunk metadata as the same, which causes frequent on-disk metadata accesses. In this article, we start by analyzing storage characteristics of backup metadata. An intriguing finding shows that with 10 million files, the file metadata merely takes up approximately 340 MB. Motivated by this finding, we propose a Classified-Metadata based Restoring method (CMR) that classifies backup metadata into file metadata and chunk metadata. Because the file metadata merely takes up a meager amount of space, CMR maintains all file metadata in memory, whereas chunk metadata are aggressively prefetched to memory in a greedy manner. A deduplication system with CMR in place exhibits three salient features: (i) It avoids rewriting algorithms' additional overhead by reducing the number of disk reads in a restoring process, (ii) it increases the restoring throughput without sacrificing the deduplication ratio, and (iii) it thoroughly leverages the hardware resources to boost the restoring performance. To quantitatively evaluate the performance of CMR, we compare our CMR against two state-of-the-art approaches, namely, a history-aware rewriting method (HAR) and a context-based rewriting scheme (CAP). The experimental results show that compared to HAR and CAP, CMR reduces the restoring time by 27.2% and 29.3%, respectively. Moreover, the deduplication ratio is improved by 1.91% and 4.36%, respectively. © 2

关键词： Metadata

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An Intelligent Optimization Method of Reinforcing Bar Cutting for Construction Site

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computer Modeling in Engineering & Sciences 2023年第1期134卷 637-655页

作者： Zhaoxi Ma Qin Zhao Tianyou Cang Zongjian Li Yiyun Zhu Xinhong Hei Department of Civil Engineering and Architecture Xi’an University of TechnologyXi’an710048China State Key Laboratory of Rail Transit Engineering Informatization(FSDI) Xi’an710043China Department of Computer Science and Engineering Xi’an University of TechnologyXi’an710048China

To meet the requirements of specifications,intelligent optimization of steel bar blanking can improve resource utilization and promote the intelligent development of sustainable *** one of the most important building materials in construction engineering,reinforcing bars(rebar)account for more than 30%of the cost in civil engineering.A significant amount of cutting waste is generated during the construction *** cutting waste increases construction costs and generates a considerable amount of CO_(2)*** study aimed to develop an optimization algorithm for steel bar blanking that can be used in the intelligent optimization of steel bar engineering to realize sustainable *** the proposed algorithm,the integer linear programming algorithm was applied to solve the *** was combined with the statistical method,a greedy strategy was introduced,and a method for determining the dynamic critical threshold was developed to ensure the accuracy of large-scale data *** proposed algorithm was verified through a case study;the results confirmed that the rebar loss rate of the proposed method was reduced by 9.124%compared with that of traditional distributed processing of steel bars,reducing CO_(2)emissions and saving construction *** the scale of a project increases,the calculation quality of the optimization algorithmfor steel bar blanking proposed also increases,while maintaining high calculation *** the results of this study are applied in practice,they can be used as a sustainable foundation for building informatization and intelligent development.

关键词： Building construction rebar work cutting stock problem optimization algorithm integer linear programming

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Online Pattern Recognition and Data Correction of PMU Data Under GPS Spoofing Attack

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Journal of Modern Power systems and Clean Energy 2020年第6期8卷 1240-1249页

作者： Ancheng Xue Feiyang Xu Jingsong Xu Joe H.Chow Shuang Leng Tianshu Bi State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China State Grid Ningxia Yinchuan Electric Power Company Yinchuan 750001China the Department of Electrical Computerand Systems EngineeringRensselaer Polytechnic Institute(RPI)TroyNY 12180USA

Smart grids are increasingly dependent on data with the rapid development of communication and *** one of the important data sources of smart grids,phasor measurement unit(PMU)is facing the high risk from *** with cyber attacks,global position system(GPS)spoofing attacks(GSAs)are easier to implement because they can be exploited by portable devices,without the need to access the physical ***,this paper proposes a novel method for pattern recognition of GSA and an additional function of the proposed method is the data correction to the phase angle difference(PAD)***,this paper analyzes the effect of GSA on PMU measurement and gives two common patterns of GSA,i.e.,the step attack and the ramp ***,the method of estimating the PAD deviation across a transmission line introduced by GSA is proposed,which does not require the line *** obtaining the estimated PAD deviations,the pattern of GSA can be recognized by hypothesis tests and correlation coefficients according to the statistical characteristics of the estimated PAD ***,with the case studies,the effectiveness of the proposed method is demonstrated,and the success rate of the pattern recognition and the online performance of the proposed method are analyzed.

关键词： global position system(GPS) GPS spoofing attack(GSA),phasor measurement,pattern recognition,data correction,line parameter

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Status and Outlook of Image-based Malware Detection Technology 3

Status and Outlook of Image-based Malware Detection Technolo...

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3rd International Symposium on computer Technology and Information Science, ISCTIS 2023

作者： Lan, Qiuyan Du, Yao Gao, Caixia Zheng, Haotian School of Computer Science and Engineering Southwest Minzu University Chengdu China Southwest Minzu University Key Laboratory of Computer System State Ethnic Affairs Commission Chengdu China

ISBN: (纸本)9798350325386

In recent years, computer vision technology has achieved rapid development and is widely used in the field of information security. Researchers have carried out a lot of research on the malicious code analysis technology based on image analysis, and many excellent image analysis models have successfully migrated to the malware detection area. This paper systematically collates the malware detection technology based on image analysis technology from different angles. Firstly, the development of computer vision technology in the field of malware, the main representation methods of feature images, malicious code detection models, and other issues are sorted out. After that, the relevant representative literature is collected and sorted out. Finally, the potential research direction of computer vision in the realm of malware detection is deliberated. © 2023 IEEE.

关键词： Image analysis

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Disjoint-Path and Golden-Pin Based Irregular PCB Routing with Complex Constraints 23

Disjoint-Path and Golden-Pin Based Irregular PCB Routing wit...

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Proceedings of the 60th Annual ACM/IEEE Design Automation Conference

作者： Qinghai Liu Qinfei Tang Jiarui Chen Chuandong Chen Ziran Zhu Huan He Jianli Chen Yao-Wen Chang Center for Discrete Mathematics Fuzhou University Fuzhou China and Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou China Center for Discrete Mathematics Fuzhou University Fuzhou China College of Computer and Date Science Fuzhou University Fuzhou China Department of Microelectronics Fuzhou University Fuzhou China Department of Microelectronics Southeast University Nanjing China Hangzhou Huawei Enterprises Telecommunication Technologies Co. Ltd Hangzhou China State Key Lab of ASIC & System Fudan University Shanghai China Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan and Department of Electrical Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)9798350323481

PCB routing becomes time-consuming as the complexity of PCB design increases. Unlike traditional schemes that treat the two essential PCB routing processes separately, namely, escape and bus routing, we consider the continuity between them and present a golden-pin-based routing scheme to find the desired solution with angle and topology constraints. Further, conventional rip-up and reroute methods are often ineffective and inefficient for congestion alleviation and routability optimization. We construct a component graph by modeling components as vertices and applying the minimum weight vertex covering method to improve the routability. A self-adaptable ordering method is presented for escape routing to arrange the pin order on the component boundary, guaranteeing successful bus routing. In addition, escape routing is performed based on a disjoint path method. We construct a dynamic Hanan grid in bus routing and utilize a novel congestion adjustment technique to improve solution quality. Compared with FreeRouting and Allegro, the experiment results show that our algorithm achieves high routability and a significant 90% runtime reduction.

关键词： escape routing

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