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学者姓名：张弛
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摘要 ：
In a practical blockchain system based on the Practical Byzantine Fault Tolerance (PBFT) protocol, the voting nodes can fail at any time due to non-Byzantine errors, such as autonomous shutdowns, device crashes, and communication link failures caused by mobility or obstacles. These errors may cause voting nodes to exit the PBFT-based blockchain system unpredictably, resulting in a variable number of voting nodes available at any given time. To maintain optimal performance and consistency while adapting a PBFT-based blockchain system to this dynamic change, this paper proposes an extension to the PBFT protocol by introducing a repair process for failed nodes. The new PBFT-based blockchain system with repairable voting nodes is then analyzed for performance and reliability analysis by using multi-dimensional Markov processes, queueing theory, and the first passage time method. Additionally, we validate the accuracy of our theoretical findings by conducting numerical examples and simulation experiments. These experiments demonstrate that the introduction of a repair process can improve the performance and reliability of the PBFT-based blockchain system. Furthermore, we illustrate how various system parameters impact the performance measures of the PBFT-based blockchain system with repairable voting nodes. We hope that the methodology and results presented in this paper will establish a common framework for deriving theoretical analysis of existing PBFT-based blockchain systems and inspire future research efforts in this field.
关键词 ：
Queueing analysis Queueing analysis Maintenance engineering Maintenance engineering Blockchains Blockchains Markov processes Markov processes reliability reliability Markov process Markov process queueing theory queueing theory Protocols Protocols Practical Byzantine fault tolerance (PBFT) Practical Byzantine fault tolerance (PBFT) repairable voting nodes repairable voting nodes blockchain blockchain performance evaluation performance evaluation Reliability theory Reliability theory Peer-to-peer computing Peer-to-peer computing
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| GB/T 7714 | Chang, Yan-Xia , Wang, Qing , Li, Quan-Lin et al. Performance and Reliability Analysis for PBFT-Based Blockchain Systems With Repairable Voting Nodes [J]. | IEEE TRANSACTIONS ON NETWORK AND SERVICE MANAGEMENT , 2024 , 21 (4) : 4039-4060 . |
| MLA | Chang, Yan-Xia et al. "Performance and Reliability Analysis for PBFT-Based Blockchain Systems With Repairable Voting Nodes" . | IEEE TRANSACTIONS ON NETWORK AND SERVICE MANAGEMENT 21 . 4 (2024) : 4039-4060 . |
| APA | Chang, Yan-Xia , Wang, Qing , Li, Quan-Lin , Ma, Yaqian , Zhang, Chi . Performance and Reliability Analysis for PBFT-Based Blockchain Systems With Repairable Voting Nodes . | IEEE TRANSACTIONS ON NETWORK AND SERVICE MANAGEMENT , 2024 , 21 (4) , 4039-4060 . |
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摘要 ：
Facility Location is a multi-objective optimization problem, where, given a set of demand centers, D, one is to determine how many facilities to open, in such a way that we satisfy the overall demand, while minimizing the sum of two types of costs: one associated to opening a facility, and the other to the distance from each demand center to the nearest facility that has been opened. There exist various techniques to solve it, including methods that are complete, and others that find a good solution, though not necessarily the optimal one. Current techniques, however, do not contemplate that there already is an initial configuration of the problem or that changes have occurred in the environment and so the existing solution must be adjusted to meet new requirements: they reformulate the optimization problem each time, starting from scratch. To fill in this gap, we introduce the adaptable Pareto set of the Facility Location Problem. In particular, we introduce a method that may apply either of two heuristics, namely: the incremental and the decremental heuristics, which deal with the case where it is necessary to increase (respectively, decrease) the number of facilities opened. To complete these heuristics, we provide a video game for crowdsourcing solutions to the adaptable Pareto set for the facility location problem; we have considered both cases, one where some facilities need to be added, and the other, where some facilities need to be removed. We have tested our two methods using the Swain dataset. Our experimental results show that our heuristics are competitive, when compared against both the optimal solution found through a complete method, and that approximated via a genetic algorithm. Further, our results show that video game players may obtain better solutions than those found heuristically, and that these solutions sometimes are similar to those found using a brute force algorithm.
关键词 ：
Crowdsourcing Crowdsourcing Facility location problem Facility location problem Heuristics Heuristics Multi-objective optimization problems Multi-objective optimization problems Pareto set Pareto set Serious video games Serious video games
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| GB/T 7714 | Vargas-Santiago, Mariano , Monroy, Raul , Zhang, Chi et al. The adaptable Pareto set problem for facility location: A video game approach [J]. | EXPERT SYSTEMS WITH APPLICATIONS , 2021 , 186 . |
| MLA | Vargas-Santiago, Mariano et al. "The adaptable Pareto set problem for facility location: A video game approach" . | EXPERT SYSTEMS WITH APPLICATIONS 186 (2021) . |
| APA | Vargas-Santiago, Mariano , Monroy, Raul , Zhang, Chi , Ramirez-Marquez, Jose E. , Leon-Velasco, Diana A. . The adaptable Pareto set problem for facility location: A video game approach . | EXPERT SYSTEMS WITH APPLICATIONS , 2021 , 186 . |
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摘要 ：
The Video game-Crowdsourcing model to recollect data motivates people to participate by entertaining them. Research showed that the solutions players make in this model are competitive against experts in the area. Yet, the studies in the area focus on mimicking people's behavior, including their mistakes. Therefore, we use a Video game-Crowdsourcing to model a problem of interest to find strategies for it. To describe matches from the video game we created, we designed a representation that simplifies the discovery of strategies. Our experimentation compares high score matches against low score ones to find the best behaviors. We played 13 matches employing a known strategy for the problem to validate the methodology. Then, we applied the methodology to matches from players. The results suggest that extracting sub-sequences is a process to find strategies and that we can use them to design algorithms to improve current algorithmic solutions for that problem.
关键词 ：
Big Data Big Data Crowdsourcing Crowdsourcing Games Games housing development problem (HDP) housing development problem (HDP) Neurons Neurons Pattern matching Pattern matching strategy strategy Task analysis Task analysis Training Training video game video game
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| GB/T 7714 | Silva-Galvez, Arturo , Monroy, Raul , Ramirez-Marquez, Jose E. et al. A Video Game-Crowdsourcing Approach to Discover a Player's Strategy for Problem Solution to Housing Development [J]. | IEEE ACCESS , 2021 , 9 : 114870-114883 . |
| MLA | Silva-Galvez, Arturo et al. "A Video Game-Crowdsourcing Approach to Discover a Player's Strategy for Problem Solution to Housing Development" . | IEEE ACCESS 9 (2021) : 114870-114883 . |
| APA | Silva-Galvez, Arturo , Monroy, Raul , Ramirez-Marquez, Jose E. , Zhang, Chi . A Video Game-Crowdsourcing Approach to Discover a Player's Strategy for Problem Solution to Housing Development . | IEEE ACCESS , 2021 , 9 , 114870-114883 . |
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摘要 ：
It is paramount to ensure the resilience of networked critical infrastructures, which are vital for the economic development and our daily requirements but threatened by intentional attacks. For this purpose, their protection before and restoration after intentional attacks are of great significance. Moreover, in order to keep the prescribed demand continuously satisfied, postdisruption flow redistribution is also necessary. However, due to the severity of intentional attacks, certain components may need to be overloaded as a result of the redistribution and, thus, the network reliability is influenced. To minimize such influence, we first present a new metric of resilience to reflect the incurred reliability changes. Then, a trilevel optimization model integrating protection, restoration, and adaptive flow redistribution to maximize the network resilience is proposed. To deal with the complexity of the proposed problem, an evolutionary algorithm is employed with necessary adaption.
关键词 ：
Critical infrastructure Critical infrastructure resilience resilience Transportation Transportation Disaster relief Disaster relief Reliability Reliability networked critical infrastructure networked critical infrastructure Economics Economics Measurement Measurement overloading overloading trilevel optimization trilevel optimization Resilience Resilience Acceleration Acceleration
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| GB/T 7714 | Zhu, Huaxing , Zhang, Chi , Ramirez-Marquez, Jose Emmanuel et al. The Integration of Protection, Restoration, and Adaptive Flow Redistribution in Building Resilient Networked Critical Infrastructures Against Intentional Attacks [J]. | IEEE SYSTEMS JOURNAL , 2021 , 15 (2) : 2959-2970 . |
| MLA | Zhu, Huaxing et al. "The Integration of Protection, Restoration, and Adaptive Flow Redistribution in Building Resilient Networked Critical Infrastructures Against Intentional Attacks" . | IEEE SYSTEMS JOURNAL 15 . 2 (2021) : 2959-2970 . |
| APA | Zhu, Huaxing , Zhang, Chi , Ramirez-Marquez, Jose Emmanuel , Wu, Su , Monroy, Raul . The Integration of Protection, Restoration, and Adaptive Flow Redistribution in Building Resilient Networked Critical Infrastructures Against Intentional Attacks . | IEEE SYSTEMS JOURNAL , 2021 , 15 (2) , 2959-2970 . |
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摘要 ：
Recently, hybrid improper ferroelectricity in layered perovskites is becoming an effective way to expand the compositional palette to find new ferroelectrics. In the present work, the ground state, electronic structure, optical properties, effective carrier masses, ferroelectric polarization, and polarization switching pathways of the Ruddlesden-Popper perovskite chalcogenides Sr3B2X7 (B = Ti, Zr, Hf; X = S, Se) were thoroughly investigated by first-principles calculations. Some new hybrid improper ferroelectrics with the A2(1)am polar ground state, i.e., Sr3Zr2S7, Sr3Zr2Se7, Sr3Hf2S7, and Sr3Hf2Se7, were predicted by confirming the electric polarization induced from a trilinear coupling of octahedral rotation and tilting modes. The results showed that the ferroelectric photovoltaic-related properties such as band gaps and electric polarizations depend crucially on the amplitude of octahedral rotations and tilts of perovskite blocks. It was predicted that Sr3Zr2Se7 could be a good candidate for ferroelectric photovoltaic device applications by a systematical evaluation of ferroelectric photovoltaic properties of all hypothetical compounds.
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| GB/T 7714 | Wang, Chao , Zhang, Ming , Wang, Ruzhi et al. First-Principles Investigation into Hybrid Improper Ferroelectricity in Ruddlesden-Popper Perovskite Chalcogenides Sr3B2X7 (B = Ti, Zr, Hf; X = S, Se) [J]. | JOURNAL OF PHYSICAL CHEMISTRY C , 2021 , 125 (25) : 13971-13983 . |
| MLA | Wang, Chao et al. "First-Principles Investigation into Hybrid Improper Ferroelectricity in Ruddlesden-Popper Perovskite Chalcogenides Sr3B2X7 (B = Ti, Zr, Hf; X = S, Se)" . | JOURNAL OF PHYSICAL CHEMISTRY C 125 . 25 (2021) : 13971-13983 . |
| APA | Wang, Chao , Zhang, Ming , Wang, Ruzhi , Zhang, Chi , Meng, Xianrui , Xi, Yupeng et al. First-Principles Investigation into Hybrid Improper Ferroelectricity in Ruddlesden-Popper Perovskite Chalcogenides Sr3B2X7 (B = Ti, Zr, Hf; X = S, Se) . | JOURNAL OF PHYSICAL CHEMISTRY C , 2021 , 125 (25) , 13971-13983 . |
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摘要 ：
Nowadays, critical infrastructures are essential for the normal operation of economics and social life. Because of the increasing number of terrorist attacks and other accidents, research on strengthening infrastructure protection has become essential. Meanwhile, the operation of many types of infrastructures mainly relies on the configuration of networks. The interdependent infrastructure network (IIN), which is a network comprising multiple infrastructure networks with different functions under supporting relationships, is highly influenced by the interdependency structure of these networks and the protection strategy. To better understand the relation between the interdependency structure and protection in two phases on infrastructure resilience and analyze their influence on IIN performance, this study investigates the IIN in a community and proposes a joint optimization method for the two phases based on an incomplete-information game under the situation of intentional attacks. Employing the maximal-flow index (MFI) as the performance metric, a multi-objective planning approach is proposed for the joint optimization of interdependency structure and protection. Furthermore, an improved probabilistic solution discovery algorithm (PSDA) is developed to solve the planning model, and the joint optimization is analyzed using extensive experimentation, including three real-world infrastructure examples.
关键词 ：
Joint optimization Joint optimization Incomplete-information game Incomplete-information game Resilience management Resilience management Disruption recovery policies Disruption recovery policies Networks Networks
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| GB/T 7714 | Li, Yulong , Lin, Jie , Zhang, Chi et al. Joint optimization of structure and protection of interdependent infrastructure networks [J]. | RELIABILITY ENGINEERING & SYSTEM SAFETY , 2021 , 218 . |
| MLA | Li, Yulong et al. "Joint optimization of structure and protection of interdependent infrastructure networks" . | RELIABILITY ENGINEERING & SYSTEM SAFETY 218 (2021) . |
| APA | Li, Yulong , Lin, Jie , Zhang, Chi , Zhu, Huaxing , Zeng, Saixing , Sun, Chengshaung . Joint optimization of structure and protection of interdependent infrastructure networks . | RELIABILITY ENGINEERING & SYSTEM SAFETY , 2021 , 218 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Networked systems, such as telecommunications, transportation, and power transmission, are critical for the economic development and social well-being of a society and are required to keep the prescribed demand continuously satisfied. Therefore, when planning maintenance actions for such a system, the adverse influence on its reliability caused by the unavailability of the components in the process of being maintained needs to be taken into account. To deal with this problem, we propose a new bi-objective optimization approach to determine the Pareto optimal maintenance plans for a networked system, simultaneously maximizing its reliability within the concerned planning horizon and minimizing the total maintenance cost. Both perfect and imperfect maintenance actions are considered. The proposed approach can well balance the influence of maintenance actions on a networked system's reliability during their implementation and after being completed and, thus, can help ensure its reliability of continuously satisfying the prescribed demand.
关键词 ：
continuous demand continuous demand bi-objective optimization bi-objective optimization unavailability unavailability networked system networked system maintenance optimization maintenance optimization
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| GB/T 7714 | Li, Wanshan , Zhang, Chi . A bi-objective optimization approach for the maintenance planning of networked systems [J]. | QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL , 2020 , 36 (4) : 1364-1385 . |
| MLA | Li, Wanshan et al. "A bi-objective optimization approach for the maintenance planning of networked systems" . | QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL 36 . 4 (2020) : 1364-1385 . |
| APA | Li, Wanshan , Zhang, Chi . A bi-objective optimization approach for the maintenance planning of networked systems . | QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL , 2020 , 36 (4) , 1364-1385 . |
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摘要 ：
Leveraging human insight and intuition has been identified as having the potential for the improvement of traditional algorithmic methods. For example, in a video game, a user may not only be entertained but may also be challenged to beat the score of another player; additionally, the user can learn complicated concepts, such as multi-objective optimization, with two or more conflicting objectives. Traditional methods, including Tabu search and genetic algorithms, require substantial computational time and resources to find solutions to multi-objective optimization problems (MOPs). In this paper, we report on the use of video games as a way to gather novel solutions to optimization problems. We hypothesize that humans may find solutions that complement those found mechanically either because the computer algorithm did not find a solution or because the solution provided by the crowdsourcing of video games approach is better. We model two different video games (one for the facility location problem and one for scheduling problems), we demonstrate that the solution space obtained by a computer algorithm can be extended or improved by crowdsourcing novel solutions found by humans playing a video game.
关键词 ：
scheduling scheduling genetic algorithms genetic algorithms combinatorial optimization combinatorial optimization multiple objective programming multiple objective programming facilities planning and design facilities planning and design
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| GB/T 7714 | Vargas-Santiago, Mariano , Monroy, Raul , Emmanuel Ramirez-Marquez, Jose et al. Complementing Solutions to Optimization Problems via Crowdsourcing on Video Game Plays [J]. | APPLIED SCIENCES-BASEL , 2020 , 10 (23) . |
| MLA | Vargas-Santiago, Mariano et al. "Complementing Solutions to Optimization Problems via Crowdsourcing on Video Game Plays" . | APPLIED SCIENCES-BASEL 10 . 23 (2020) . |
| APA | Vargas-Santiago, Mariano , Monroy, Raul , Emmanuel Ramirez-Marquez, Jose , Zhang, Chi , Leon-Velasco, Diana A. , Zhu, Huaxing . Complementing Solutions to Optimization Problems via Crowdsourcing on Video Game Plays . | APPLIED SCIENCES-BASEL , 2020 , 10 (23) . |
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摘要 ：
To study the seismic performance of assembled composite beam-precast column concrete frame structures with rebars lapping in pressed sleeve, quasi-static tests on two 1/2-scale assembled frame specimens with two story and two span were carried out for the failure modes, deformation capacity, load capacity and so on. The test results indicate that both the specimen designed as "strong column-weak beam" and the specimen designed as "strong beam-weak column" can achieve the expected failure modes. The lateral load-displacement hysteresis curves of the specimens are rounded; the minimum inter-story drift ratios of two specimens are 1/29 and 1/31, respectively, all the inter-story displacement ductility factors are greater than 4.0, indicating that the specimens have good ductility; the pressed sleeves can transfer the tensile and compressive force of rebars effectively; the non-linear analysis results of specimens using the finite element software MSC.MARC agree well with the experimental results, and the pushover analysis results show that the horizontal force-displacement curve of assembled specimen KJ1 is basically consistent with that of cast-in-place frame. The seismic behavior of assembled frames with rebars spliced by mechanical connection can meet the requirements in current codes, and the internal force, deformation and bearing capacity can be calculated according to the cast-in-place frame. © 2019, Editorial Office of China Civil Engineering Journal. All right reserved.
关键词 ：
Assembled frame; Finite element simulation; Quasi-static test; Rebars spliced by mechanical connection; Seismic behavior Assembled frame; Finite element simulation; Quasi-static test; Rebars spliced by mechanical connection; Seismic behavior
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| GB/T 7714 | Zhang, W. , Wang, G. , Zhang, C. et al. Experimental study and finite element analysis on seismic behavior of assembled frames with rebars spliced by mechanical connection [钢筋机械连接的装配式框架抗震性能试验研究与有限元分析] [J]. | China Civil Engineering Journal , 2019 , 52 (5) : 47-58 . |
| MLA | Zhang, W. et al. "Experimental study and finite element analysis on seismic behavior of assembled frames with rebars spliced by mechanical connection [钢筋机械连接的装配式框架抗震性能试验研究与有限元分析]" . | China Civil Engineering Journal 52 . 5 (2019) : 47-58 . |
| APA | Zhang, W. , Wang, G. , Zhang, C. , Liu, S. . Experimental study and finite element analysis on seismic behavior of assembled frames with rebars spliced by mechanical connection [钢筋机械连接的装配式框架抗震性能试验研究与有限元分析] . | China Civil Engineering Journal , 2019 , 52 (5) , 47-58 . |
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摘要 ：
Road roughness is a significant index to evaluate driving comfort and safety. However, the evaluation commonly used both in China and abroad shows great subjectivity due to the lack of information about passengers' physiological responses. To make evaluation more objective and comprehensive, this research analyzes the change of various physiological indexes on different roughness conditions. The result indicates that road roughness has a definite impact on physiological indexes and there is a logarithmic relationship between the range of heart rate and the average of international roughness index (IRI), which shows that it is reasonable to use the combination of IRI and heart rate to reflect road comfort and safety. © ASCE.
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| GB/T 7714 | Zhang, C. , Lu, Y. , Zhao, W. et al. Study on the applicability of physiological method for evaluating pavement roughness [C] . 2019 : 905-915 . |
| MLA | Zhang, C. et al. "Study on the applicability of physiological method for evaluating pavement roughness" . (2019) : 905-915 . |
| APA | Zhang, C. , Lu, Y. , Zhao, W. , Cao, J. , Rong, J. , Ban, X. et al. Study on the applicability of physiological method for evaluating pavement roughness . (2019) : 905-915 . |
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