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Fault-Tolerant Scheduling for Real-Time Tasks on Multiple Earth-Observation Satellites

IEEE Transactions on Parallel and Distributed systems 2015年第11期26卷 3012-3026页

作者： Zhu, Xiaomin Wang, Jianjiang Qin, Xiao Wang, Ji Liu, Zhong Demeulemeester, Erik Science and Technology on Information Systems Engineering Laboratory National University of Defense Technology Changsha Hunan410073 China Department of Computer Science and Software Engineering Auburn University AuburnAL36849-5347 United States Department of Decision Sciences and Information Management Research Center for Operations Management KU Leuven LeuvenBE-3000 Belgium

Fault-tolerance plays an important role in improving the reliability of multiple earth-observing satellites, especially in emergent scenarios such as obtaining photographs on battlefields or earthquake areas. Fault tolerance can be implemented through scheduling approaches. Unfortunately, little attention has been paid to fault-tolerant scheduling on satellites. To address this issue, we propose a novel dynamic fault-tolerant scheduling model for real-time tasks running on multiple observation satellites. In this model, the primary-backup policy is employed to tolerate one satellite's permanent failure at one time instant. In the light of the fault-tolerant model, we develop a novel fault-tolerant satellite s cheduling algorithm named FTSS. To improve the resource utilization, we apply the overlapping technology that includes primary-backup copy overlapping (i.e., PB overlapping) and backup-backup copy overlapping (i.e., BB overlapping). According to the satellites characterized with time windows for observations, we extensively analyze the overlapping mechanism on satellites. We integrate the overlapping mechanism with FTSS, which employs the task merging strategies including primary-backup copy merging (i.e., PB merging), backup-backup copy merging (i.e., BB merging) and primary-primary copy merging (i.e., PP merging). These merging strategies are used to decrease the number of tasks required to be executed, thereby enhancing system schedulability. To demonstrate the superiority of our FTSS, we conduct extensive experiments using the real-world satellite parameters supplied from the satellite tool kit or STK;we compare FTSS with the three baseline algorithms, namely, NMFTSS, NOFTSS, and NMNOFTSS. The experimental results indicate that FTSS efficiently improves the scheduling quality of others and is suitable for fault-tolerant satellite scheduling. © 1990-2012 IEEE.

关键词： Scheduling

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Business process mining

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Encyclopedia with Semantic Computing and Robotic Intelligence 2017年第1期1卷

作者： Asef Pourmasoumi Ebrahim Bagheri Department of Electrical and Computer Engineering Ryerson University Canada Laboratory for Systems Software and Semantics (LS3) 87 Gerrard St East Toronto ON M5B 1G9 Canada

One of the most valuable assets of an organization is its organizational data. The analysis and mining of this potential hidden treasure can lead to much added-value for the organization. Process mining is an emerging area that can be useful in helping organizations understand the status quo, check for compliance and plan for improving their processes. The aim of process mining is to extract knowledge from event logs of today’s organizational information systems. Process mining includes three main types: discovering process models from event logs, conformance checking and organizational mining. In this paper, we briefly introduce process mining and review some of its most important techniques. Also, we investigate some of the applications of process mining in industry and present some of the most important challenges that are faced in this area.

关键词： Business process mining process discovery conformance checking organizational mining process improvement

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Raising fairness issue of vehicle routing problem

Raising fairness issue of vehicle routing problem

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IEEE International Conference on Intelligent Transportation engineering (ICITE)

作者： Saiful Azad Leonardo Badia Arafatur Rahman Jasni Mohamad Zain Faculty of Computer Systems & Software Engineering University Malaysia Pahang Gambang Kuantan Malaysia UMP IBM Center of Excellence Gambang Kuantan Malaysia Department of Information Engineering University of Padova Padova Italy Universiti Malaysia Pahang Kuantan Pahang MY

ISBN: (纸本)9781467390491

Since fairness deals with the quality of distributing the jobs and creates an ambience that is free from any discrimination, any distribution management problem must take fairness issue into consideration. Again, since the Vehicle Routing Problem (VRP) is also a distribution management problem, any VRP solving algorithm must consider the fairness when solutions are explored. However, most of the proposed VRP solving algorithms do not take this issue into consideration. In this paper, we raise this issue with sufficient evidences. In this course of action, following contributions are made in this paper: i) fairness issue is raised analytically, and to support this, an extensive simulation campaign is performed, ii) the VRP is discussed through a practical application, namely Garbage Collection Problem (GCP), and later it is mathematically formulated, iii) a Genetic Algorithm (GA) is employed to explore feasible solutions for the given application (i.e., GCP), and iv) some future research directives are noted, which will help the researchers to extend this work.

关键词： Silicon Vehicles Genetic algorithms Vehicle routing Mathematical model Analytical models Urban areas

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Index Modulated OFDM with ICI Self-Cancellation for V2X Communications

Index Modulated OFDM with ICI Self-Cancellation for V2X Comm...

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International Conference on Computing, Networking and Communications

作者： Yuke Li Miaowen Wen Xiang Cheng Liu-Qing Yang State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences School of Electronic and Information Engineering South China University of Technology School of Electronics Engineering and Computer Science Peking University

ISBN: (纸本)9781467385800

Recent years have witnessed the rapid development of intelligent transportation systems (ITS), which urgently call for highly reliable and effective communication technologies for vehicle-to-vehicle and vehicle-to-infrastructure (V2X) applications. Orthogonal frequency division multiplexing (OFDM) is widely believed to be the most promising candidate among these applications. However, the orthogonality of subcarriers in OFDM can be easily destroyed by the Doppler-induced inter-carrier interference (ICI), which is very common in V2X channels. In this paper, we propose a novel scheme which integrates the ICI self-cancellation technique into the index modulated (IM-) OFDM framework. Via careful designs, the proposed scheme can not only inherit the advantages of IM-OFDM but also suppress the ICI from active subcarriers. Simulations validate that in V2X channels, the proposed scheme significantly outperforms existing IM-OFDM and more importantly shows better performance than the conventional OFDM with ICI self-cancellation without sacrificing the spectral efficiency.

关键词： OFDM Vehicles Indexes Detectors Modulation Computational complexity Doppler shift

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Analysis and Design of Coupling Capacitors for Contactless Capacitive Power Transfer systems

Analysis and Design of Coupling Capacitors for Contactless C...

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Transportation Electrification Conference and Expo

作者： Deepak Rozario Najath Abdul Azeez Sheldon S. Williamson Smart Transportation Electrification and Energy Research (STEER) Group Advanced Storage Systems and Electric Transportation (ASSET) Laboratory UOIT-Automotive Center of Excellence (UOIT-ACE) Department of Electrical Computer and Software Engineering Fac

ISBN: (纸本)9781509004041

This paper is focused on the analysis and design of the capacitive plates of the capacitive wireless power transfer system. The coupling structure resembles a loosely coupled capacitor. The electric field coupling interface is the most vital part of the wireless technology. The coupling interface determines the capacitance of the coupling capacitors, maximum power transfer, frequency and overall efficiency of the system. The paper is dedicated to understand the behaviour of the system with respect to the structural construction, frequency of operation and factors that affect the power transfer of the system. The various arrangements and configurations of the capacitive power transfer (CPT) are discussed. The important factors affects the value of coupling capacitance are discussed. Based on results obtained from the analysis, a design guide line is laid out for the construction of the coupling capacitors. The design guidelines addresses critical issues such as operational voltage, temperature stability and selection of the dielectric material. The construction of the system is simple, rugged and inexpensive, which makes it a great contender among the other wireless technology.

关键词： Capacitor circuits chargers energy storage modelling surface charging transportation

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A Modified Resonant Converter for Wireless Capacitive Power Transfer systems used in Battery Charging Applications

A Modified Resonant Converter for Wireless Capacitive Power ...

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Transportation Electrification Conference and Expo

ISBN: (纸本)9781509004041

The paper outlines a capacitive power transfer (CPT) system for higher power applications. The paper summarizes the operating principle, power electronics requirement and modeling of a basic CPT system. The high frequency converter is the drive force of the contactless system. The high frequency converters found in literature are discussed with their advantages and their drawbacks. With the knowledge of the converters used, an existing topology is modified to fit the capacitive interface of the capacitive power transfer system. The modified LLC resonant converters has several advantages over the traditional converters used for contactless CPT .The converter has a very high power density and can be used for very high power applications. One of the greatest advantages the modified LLC resonant converter is the ability to work off resonance and the inherent ability to buck or boost as per its gain plot. The converter exhibits efficiencies greater than 90%. The design of the proposed topology along with its advantages over the existing topologies for small distance applications are listed.

关键词： Capacitive Circuits Wireless Power Transfer Power Electronics Surface Charging Transportation

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Comment on "Inherent security of phase coding quantum key distribution systems against detector blinding attacks" [Laser Phys. Lett. 15, 095203 (2018)]

arXiv

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arXiv 2018年

作者： Fedorov, Aleksey Gerhardt, Ilja Huang, Anqi Jogenfors, Jonathan Kurochkin, Yury Lamas-Linares, Antía Larsson, Jan-Åke Leuchs, Gerd Lydersen, Lars Makarov, Vadim Skaar, Johannes Russian Quantum Center Skolkovo Moscow143025 Russia QRate Skolkovo Moscow143025 Russia QApp Skolkovo Moscow143025 Russia Institute of Physics University of Stuttgart Institute for Quantum Science and Technology Pfaffenwaldring 57 StuttgartD-70569 Germany Max Planck Institute for Solid State Research Heisenbergstraße 1 StuttgartD-70569 Germany Institute for Quantum Information State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China Department of Electrical Engineering Linköping University LinköpingSE-58183 Sweden Texas Advanced Computing Center University of Texas at Austin AustinTX United States Max Planck Institute for the Science of Light University of Erlangen-Nürnberg ErlangenD-91058 Germany Kringsjåvegen 3E TrondheimNO-7032 Norway National University of Science and Technology MISIS Moscow119049 Russia Department of Technology Systems University of Oslo Box 70 KjellerNO-2027 Norway

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Index Modulated OFDM with ICI Self-Cancellation

Index Modulated OFDM with ICI Self-Cancellation

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IEEE Vehicular Technology Conference

ISBN: (纸本)9781509016990

Orthogonal frequency division multiplexing (OFDM) is prone to frequency offset which gives rise to intercarrier interference (ICI). Recently, a novel OFDM transmission scheme called OFDM with index modulation (IM-OFDM) is proposed, which outperforms conventional OFDM in the absence of frequency offset. As in IM-OFDM, partial subcarriers are set to be idle by spatial modulation, the potential of IM-OFDM in ICI reduction is expected. In this paper, we find that this potential vanishes in some real scenarios with ICI, which leads to IM-OFDM exhibiting even worse performance than conventional OFDM. To improve this situation, a novel ICI cancellation scheme is designed, which integrates the ICI self-cancellation technique into the IM-OFDM framework. Via careful designs, the proposed scheme not only provides a solution to ICI problems of IM-OFDM, but also achieves an attractive tradeoff between the spectral efficiency and ICI cancellation performance of the system. Simulations validate that in the presence of carrier frequency offset (CFO), the proposed scheme significantly outperforms existing IM-OFDM and more importantly shows better performance than the conventional OFDM with ICI self-cancellation.

关键词： Orthogonal frequency division multiplexing ICI CANCELLATIONS FREQUENCY SHIFT

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Interactive reflection simulation via physical shading model and fast environment mapping

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ICIC Express Letters, Part B: Applications 2016年第2期7卷 351-356页

作者： Xu, Jie Fu, Jinhua School of Software Zhengzhou University of Light Industry China School of Computer and Communication Engineering Zhengzhou University of Light Industry No. 5 Dongfeng Road Zhengzhou China State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Information Science and Technology Institute Zhengzhou China

In order to enhance realistic reflection effects on some objects and realize faster rendering to meet interactive requirements, we present a novel method to produce interactive reflection simulation using physical shading model and fast environment mapping. The physical shading model could efficiently express ambient lighting, specular lighting and diffuse lighting. Also the model is based on the microfacet distribution function, which can describe physics-based characteristics. Fast environment mapping is realized by Spherical Harmonics (SH) transformation, and the rendering equation can be rewritten as a simple dot product of SH coefficients, which fits for GPU (Graphics Processing Unit) computation. The results show that we can realize faster rendering and acquire realistic reflection effects such as glossy and mapping scene on the surface. © 2016 ICIC International.

关键词： Lighting

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Neural Incremental Attribute Learning Based on Principal Component Analysis

Neural Incremental Attribute Learning Based on Principal Com...

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2016 IEEE International Conference on Big Data Analysis

作者： Ting Wang Wei Zhou Xiaoyan Zhu Fangzhou Liu Sheng-Uei Guan State Key Laboratory of Intelligent Technology and Systems Tsinghua University Wuxi Research Institute of Applied Technologies Tsinghua University Dept. of Computer Science University of Liverpool Dept. of Computer Science and Software Engineering Xi'an Jiaotong-Liverpool University

ISBN: (纸本)9781467395922

Feature Extraction(FE) based on Principal Component Analysis(PCA) can effectively improve classification results by reducing the interference among features. However, such a good method has not been employed in previous studies of Incremental Attribute Learning(IAL), a novel machine learning strategy, where features are gradually trained one by one in order to remove interference among features and improve classification results. This study proposed a preprocessing for neural IAL algorithm based on feature extraction with PCA. Experimental results show that this approach is not only very efficient, but also applicable for pattern classification performance improvement.

关键词： pattern Classification Feature Extraction Principal Component Analysis Neural Networks Incremental Attribute Learning

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