Changcheng Li

Nanjing University of Posts and Telecommunications

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Lihui He

Ningxia University

Rui Bao

Sichuan University

Shujian Huang

China Southern Power Grid (China)

Yibo Zhu

Chongqing Medical University

Yingjie Song

Sichuan Normal University

Wenwen Xu

China Southern Power Grid (China)

Long Yang

Guizhou University

Yongjian Ye

South China University of Technology

Yin Xu

Beijing Jiaotong University

Cuiting Peng

Sichuan University

Cooperative Institutions

Sichuan University

Chinese Academy of Sciences

West China Hospital of Sichuan University

State Key Laboratory of Biotherapy

Guangxi University

Sun Yat-sen University

Huazhong University of Science and Technology

Jilin University

Chinese Academy of Medical Sciences & Peking Union Medical College

Shanghai Jiao Tong University

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Deformation history of the Qianlishan Complex, Khondalite Belt, North China: Structures, ages and tectonic implications

Journal of Structural Geology (2020)

Changqing Yin Hengzhong Qiao Shoufa Lin Changcheng Li Jian Zhang

Lineation

10.1016/j.jsg.2020.104176

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Citations (13)

A novel reinforcement learning method for the plan of generator start-up after blackout

Electric Power Systems Research (2023)

Zirui Wu Changcheng Li Ling He

Blackout

10.1016/j.epsr.2023.110068

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Citations (2)

MTMT: Consolidating Multiple Thinking Modes to Form a Thought Tree for Strengthening LLM

arXiv (Cornell University) (2024)

Changcheng Li Xiangyu Wang Qiuju Chen Xiren Zhou Huanhuan Chen

Large language models (LLMs) have shown limitations in tasks requiring complex logical reasoning and multi-step problem-solving. To address these challenges, researchers have employed carefully designed prompts and flowcharts, simulating human cognitive processes to enhance LLM performance, such as the Chain of Thought approach. In this paper, we introduce MTMT (Multi-thinking Modes Tree), a novel method that interacts with LLMs to construct a thought tree, simulating various advanced cognitive processes, including but not limited to association, counterfactual thinking, task decomposition, and comparison. By breaking down the original complex task into simpler sub-questions, MTMT facilitates easier problem-solving for LLMs, enabling more effective utilization of the latent knowledge within LLMs. We evaluate the performance of MTMT under different parameter configurations, using GPT-4o mini as the base model. Our results demonstrate that integrating multiple modes of thinking significantly enhances the ability of LLMs to handle complex tasks.

Tree (set theory)

10.48550/arxiv.2412.03987

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An Islanding Integration Strategy During the Reconfiguration of Distribution Systems Based on Multi-sources

2020 IEEE 3rd Student Conference on Electrical Machines and Systems (SCEMS) (2020)

Wei Luo Yongjian Ye Shangchun Ju Shujian Huang Wenting Yan

When an outage occurs on a distribution system due to extreme events, distributed generators (DG) can be used to restore the blackout system. Based on multi-source, the distribution system is divided into multiple islands to restore local loads. This paper proposes a new strategy for multisource islanding integration during the reconfiguration of distribution systems. Firstly, the constraints on the integration of islands are studied for determining the number of islands. With the load shedding, the number of islands can be expanded. Secondly, the tie lines satisfying the constraints between islands are connected to realize the islanding integration. Then, constructing mix-integer second-order cone programming (MISOCP) is used to solve the problem of integration. Finally, case studies on the IEEE 33-bus distribution system indicate that the proposed islanding integration strategy is feasible and beneficial to the restoration process.

Islanding

Blackout

Control reconfiguration

10.1109/scems48876.2020.9352334

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Online Decision-Making of Parallel Restoration Strategy for Power Systems Based on Susceptible-Infected-Recovered Model

International Transactions on Electrical Energy Systems (2022)

Changcheng Li Yongjian Ye Shujian Huang Yin Xu Bisong Wang

Parallel restoration following blackouts can reduce economic and social losses. This paper aims to develop a parallel restoration method coordinating the partitioning scheme of the blackout system and restoration strategies of subsystems. The susceptible-infected-recovered model, i.e., a virus propagation model of complex networks, is used to decide the parallel restoration strategies online. Firstly, various types of viruses are used to represent different subsystems. The probability vector of virus infection is obtained according to the importance level of each bus. Secondly, an immunization strategy is developed based on the faulted buses in the blackout situation. According to the infection rate and the immunization strategy, the virus propagation direction will be changed based on real-time system conditions. The startup characteristics of units and the charging reactive power of restoration paths are considered as constraints to embed in the virus propagation process. Finally, the partitioning scheme and the restorative actions for subsystems are determined based on the infected results of viruses. The effectiveness of the proposed method is validated by case studies on the IEEE 39-bus and the IEEE 118-bus test systems.

Blackout

10.1155/2022/9696952

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Citations (1)

Structural characterization of a Δ³, Δ²-enoyl-CoA isomerase from Pseudomonas aeruginosa: implications for its involvement in unsaturated fatty acid metabolism

Figshare (2018)

Li Liu Tao Li Cuiting Peng Changzhen Sun Changcheng Li

Gene PA4980 from Pseudomonas aeruginosa encodes a putative enoyl-coenzyme A hydratase/isomerase that is associated with the function of the biofilm dispersion-inducing signal molecule cis-2-decenoic acid. To elucidate the role of PA4980 in cis-2-decenoic acid biosynthesis, we reported the crystal structure of its protein product at 2.39 Å. The structural analysis and substrate binding prediction suggest that it acts as a monofunctional enoyl-coenzyme A isomerase, implicating an alternative pathway of the cis-2-decenoic acid synthesis.

Characterization

Fatty Acid Metabolism

10.6084/m9.figshare.6871268

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One station observation system for Mars exploration

Changcheng Li Xiaofei Chen

&#160;&#160;&#160; Since entering the 21st century, with the progress and development of science and technology. Human exploration of the world is not limited to the earth. Remarkable achievements have also been made in the exploration and understanding of the planet. In the last century, the US completed the exploration of the internal structure of the moon by using seismological methods through the Apollo program. The successful launch of insight in 2018 marked the birth of Marsquake, and realized the preliminary exploration of the internal structure of Mars. Due to the limitation of aerospace capability, the scientific research equipment we can carry is limited. The NASA spent hundreds of millions of dollars to deploy a seismograph on Mars. However, the deployment of a single seismograph is usually difficult to accurately measure the internal structure of Mars. Because the imaging method based on the internal vibration signal of Mars requires the use of a single seismograph constraining the source information and the internal structure of Mars at the same time, Which will increase the risk of inversion multiplicity.&#160;&#160;&#160; The main function of placing seismometers on the planet is to monitor the internal activity law of the planet. However, if we can obtain more reliable planetary exploration data without increasing the detection cost by designing a reasonable observation system, it will play an important role in the future exploration of the internal structure of the planet.&#160;&#160;&#160; Thus, a single station observation system is designed, which lays a foundation for seismic imaging to obtain more controllable and reliable data through the combination of single station and moving source(Rover). In this way, we can obtain two-dimensional and three-dimensional planetary seismic profiles in the future.<img src="https://contentmanager.copernicus.org/fileStorageProxy.php?f=gnp.5d27262acbc160155470461/sdaolpUECMynit/22UGE&app=m&a=0&c=90e382ff7732792856b5e7cc4257c43d&ct=x&pn=gnp.elif&d=1" alt="" width="214" height="163">&#160;

Seismometer

10.5194/egusphere-egu22-982

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An Improved Label Propagation Algorithm-Based Method to Develop Sectionalizing Strategies for Parallel Power System Restoration

IEEE Access (2020)

Shujian Huang Changcheng Li Zhicheng Li Wenwen Xu Long Yang

The first task of parallel power system restoration is to sectionalize the blackout system into multiple subsystems.This paper applies the complex network community discovery theory into this sectionalizing problem and proposes an improved label propagation algorithm-based sectionalizing method considering the system topology and operation before blackouts.Firstly, each blackstart (BS) unit bus is marked with a different subsystem label.A label propagation matrix is calculated based on the active power of branches before the blackout.Then, to avoid the label oscillation, a novel label impact strategy considering the influence of the bus label itself is developed to improve the label propagation matrix.The buses' labels propagate to neighboring buses as the improved label propagation matrix until they do not change.The initial sectionalizing strategy is obtained through classifying the buses with the same label in the same subsystem.Finally, the sectionalizing constraints are used to evaluate the feasibility of the initial strategy.For the initial strategy that does not satisfy the constraints, a refining method to minimize the absolute value of active power exchange among subsystems is proposed to determine the final sectionalizing strategy based on it.Case studies on IEEE 39-bus and IEEE 118-bus test systems verify the effectiveness of the proposed method.The results indicate that the proposed method has advantages in creating strongly connected subsystems.

Blackout

Matrix (chemical analysis)

10.1109/access.2020.3005573

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Citations (6)

Dynamic Decision-Making of Blackstart Scheme Based on VSC-HVDC

2020 IEEE 3rd Student Conference on Electrical Machines and Systems (SCEMS) (2020)

Yongjian Ye Wei Luo Shangchun Ju Shujian Huang Long Yang

The reasonable selection of the power system blackstart scheme is of great significance to restore the power system rapidly. According to the relationship between the output characteristics of voltage source converter (VSC) and the alternating current (AC) system strength, this paper proposes an optimal decision-making method for blackstart. The short circuit ratio (SCR) is introduced to measure the strength of the restored AC system, and the restoration process of the AC system is quantified by the branch addition method. Then, the evaluation framework of the blackstart is constructed, and the weight of each criterion is evaluated by SCR. Analytic hierarchy process (AHP) and entropy weight (EW) methods are used to evaluate each unit and its restoration path, and the technique for order preference by similarity to an ideal solution (TOPSIS) method is used to obtain the restoration sequence of units. Finally, according to the changes of system strength and data, the final restoration sequence is obtained through multiple decisions. Case studies on IEEE 39-bus test systems demonstrate that the proposed dynamic decision-making method can provide accurate decision results.

TOPSIS

Ideal solution

Sequence (biology)

10.1109/scems48876.2020.9352297

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Evolution of the Xiaotian-Mozitan fault and its implications for exhumation of Dabie HP–UHP rocks

Progress in Natural Science Materials International (2008)

Biwei Xiang Yongsheng Wang Changcheng Li Guang Zhu Yonghong Shi

The Xiaotian-Mozitan fault (XMF) located north of the Dabie orogenic belt separates the North Dabie complex to the south from the Beihuaiyang low-grade metamorphic rocks to the north. It comprises several NW-striking ductile shear zones and brittle faults. The brittle faults obviously overprinted on the ductile shear zones and promoted the development of the volcanic basins in early Cretaceous to the north, which suggests that the brittle faults were normal faults formed in early Cretaceous during doming of the Dabie orogenic belt. The ductile shear zone superposed on the north Dabie gray gneiss, and it is an important channel where the Dabie HP–UHP rocks exhumed. For obtaining new structural constraint on exhumation of the HP–UHP rocks, we present here experimental results on the microstructure, quartz C-axis fabrics and the microprobe analyses of phengite. The ductile shear zone was determined to be formed at a temperature of 600–650 °C and pressure of 1.1 GPa by the mineral deformation, microprobe analyses and geobarometry of Si-in-phengite of the mylonite, the results suggest that the mylonite now exposed on the surface experienced an upper amphibolite-facies metamorphism in the lower crust. The mineral stretching lineation varies from horizontal in the east segment to sub-dip in the west. Shear sense indicators from outcrop and thin sections of orientated specimen and quartz C-axis fabrics suggest that the XMF is a sinistral normal fault. The kinematics analysis of the ductile shear zone indicates that the exhumation of Dabie HP–UHP rocks is the results of a SE-directed extrusion and an anticlockwise rotation around its eastern pivot simultaneously.

Mylonite

Phengite

Coesite

Lineation

Tectonite

Doming

10.1016/j.pnsc.2007.11.020

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Citations (6)