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Coordinated Chance-constrained Optimization of Multi-energy Microgrid System for Balancing operation efficiency and Quality-of-service

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Journal of Modern Power Systems and Clean Energy 2020年第5期8卷 853-862页

作者： Sidun Fang Tianyang Zhao Yan Xu Tianguang Lu School of Electrical and Electronics Nanyang Technological UniversitySingaporeSingapore School of Engineering and Applied Sciences Harvard UniversityCambridgeUSA

To enhance the flexible interactions among multiple energy carriers,i.e.,electricity,thermal power and gas,a coordinated programming method for multi-energy microgrid(MEMG)system is *** energy requirements for both residential and parking loads are managed simultaneously,i.e.,electric and thermal loads for residence,and charging power and gas filling requirements for parking *** proposed model is formulated as a two-stage joint chance-constrained programming,where the first stage is a day-ahead operation problem that provides the hourly generation,conversion,and storage towards the minimization of operation cost considering the forecasting error of photovoltaic output and load ***,the second stage is an on-line scheduling which adjusts the energy scheme in hourly time-scale considering the *** have demonstrated the validity of the proposed method,i.e.,collecting the flexibilities of thermal system,gas system,and parking vehicles to facilitate the operation of electrical *** analysis shows that the proposed scheme can achieve a compromise between the operation efficiency and service quality.

关键词： Multi-energy microgrid system operation efficiency quality-of-service joint chance-constrained programming

operation efficiency and Influencing Factors of Listed Companies of Swine Industry:Empirical Analysis Based on Data of 16 Listed Companies in 2010-2014

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Asian Agricultural Research 2017年第3期9卷 14-19,23页

作者： Mengqi YOU Zhenhong QI Ai’e WANG Xinrui LI Weihong HUANG Wenbin WAN College of Economics and Management Huazhong Agricultural UniversityWuhan 430070China Hubei Rural Development Research Center Wuhan 430070China

Listed companies of the swine industry,as an important form of agricultural industrialized operation,are typical representatives of large-scale production and the level of their operation efficiency exerts a direct influence on the healthy development of the swine *** the DEA-based Malmquist method,this paper made a static and dynamic evaluation of the operation efficiency of 16 listed companies in China's swine industry in 2010-2014. It obtained following results:( i) The overall efficiency of listed companies of China's swine industry remained at high level and the development trend was excellent.( ii) Different types of enterprises had difference in the overall efficiency,pure technical efficiency and scale efficiency. In general,pig feed processing companies had the best performance,followed by slaughtering and deep processing companies,and swine breeding companies were the worst.( iii) The total factor productivity characterized by the Malmquist index declined year by year in 2010-2013 and was improved in 2014,mainly due to technological progress.( iv) The total asset turnover ratio,equity concentration,and R & D management level had a significantly positive impact on the operation efficiency of listed companies in the swine industry,while the human capital had a significantly negative impact.

关键词： operation efficiency Influencing factor Listed companies of swine industry DEA-based Malmquist DEA-Tobit

Theoretical Analysis of Measurement in operation efficiency in Optical Cable Transmission Networks

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The Journal of China Universities of Posts and Telecommunications 2000年第1期7卷 60-66页

作者： LIUGuo-liang ZHAOYing-cai 等 Changchun Institute of Posts and Telecommunications Changchun130012P.R.China Jilin University of Technology

It is necessary to study dynamic operation efficiency of transmission networks in order to realize high intensification of communication networks. The operation efficiency discussed here should exist not only in logic-circuit layer, but also in both path layer and medium layer. A theoretical method of the measurement of layers and comprehensive evaluations is presented based on the concept of transmission efficiency.

关键词： transmission network logic circuit, path system optical cable fiber core operation efficiency circuit merging

Theoretical Analysis of Measurement in operation efficiency in Optical Cable Transmission Networks

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The Journal of China Universities of Posts and Telecommunications 2000年第Z1期 60-66页

作者： LIU Guo-liang ZHAO Ying-cai WANG Li-hua (1 Changchun Institute of Posts and Telecommunications, Changchun, 130012, P. R. China 2 Jilin University of Technology, Changchun, 130025, P. R. China)

关键词： transmission network logic circuit, path system optical cable fiber core operation efficiency circuit merging

The operation efficiency Evaluation for Listed Companies of China Aviation Industry Based on DEA and Malmquist Index

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International Journal of Plant Engineering and Management 2012年第4期17卷 223-229页

作者： XIA Wei-li CHENG Jun-heng WU Peng GONG Shu-yan School of Management Northwestern Polytechnical University

The data envelopment analysis （DEA） is used to evaluate operation efficiency of 17 listed companies in China aviation industry from 2006 to 2011, and make longitudinal analysis for the operation efficiency. In addition, the reason of changing efficiency is dynamically evaluated by Malmquist productivity index. The empirical results show that average operation efficiency of 17 listed companies in China aviation industry is less than 1, which means that the operation activities of aviation industry exist diseconomies characteristic, technological progress efficiency is a major influenced factor

关键词： aviation industry data envelopment analysis operation efficiency Malmquist index

Model Predictive Control of operation efficiency of Belt Conveyor

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Model Predictive Control of Operation Efficiency of Belt Con...

Research on the Logistics Cost and Enterprise operation efficiency with the Influences on International Trade

第二十九届中国控制会议

作者： ZHANG Shirong Department of Automation,Wuhan University,Wuhan 430072,P.R.China

Variable speed control is proposed in literature to improve the operation efficiency of a belt ***,the current implementations mostly focus on lower level control loops without considerations at the system *** paper intends to introduce optimisation approach to improve the operation efficiency of the belt conveyor under various *** open loop optimal control is firstly proposed and followed by a closed-loop model predictive control（MPC）.A typical belt conveyor is taken as a case study where the open loop and closed-loop control strategies are simulated,*** simulation results are presented to show the advantages of the optimisation of operation efficiency of belt ***,the rustiness of the MPC approach under certain disturbance is also convinced by the case study.

关键词： Belt Conveyor operation efficiency Optimal Control Model Predictive Control

来源： cnki会议评论

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International Journal of Technology Management 2016年第3期 66-68页

作者： Yuan Lin Weihai Vocational College WeihaiShandong264210 China

In this paper, we conduct research on the logistics cost and enterprise operation efficiency with the influences on international trade. With the deepening of the reform of the market economic system in our country, and the advancement of the reform of state-owned enterprises and government function transformation, the company is out of the shackles of the planned economy as the main body of market competition, at the same time, government regulators and investors in a state-owned capital market, all kinds of financial intermediaries and the information intermediary organizations, as well as the associated with the interests of closely linked to the enterprise value creation main body, including business owners and operators have yet to establish a timely to adapt to the market economy system. With this guidance, we propose the novel international trade paradigm for the companies that will enhance the efficiency of the general management.

关键词： Logistics Cost Enterprise operation efficiency International Trade Influences.

Adaptive Power Control Based on Double-layer Q-learning Algorithm for Multi-parallel Power Conversion Systems in Energy Storage Station

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Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1714-1724页

作者： Yile Wu Le Ge Xiaodong Yuan Xiangyun Fu Mingshen Wang School of Electric Power Engineering Nanjing Institute of TechnologyNanjingChina State Grid Jiangsu Electric Power Co. Ltd.NanjingChina

An energy storage station(ESS)usually includes multiple battery systems under parallel *** each battery system,a power conversion system(PCS)is used to connect the power system with the battery *** allocating the ESS power to multi-parallel PCSs in situations with fluctuating operation,the existing power control methods for parallel PCSs have difficulty in achieving the optimal efficiency during a long-term time *** addition,existing Q-learning algorithms for adaptive power allocation suffer from the curse of *** overcome these challenges,an adaptive power control method based on the double-layer Q-learning algorithm for n parallel PCSs of the ESS is proposed in this ***,a selection method for the power allocation coefficient is developed to avoid repeated ***,the outer action space is divided into n+1 power allocation modes according to the power allocation characteristics of the optimal operation *** inner layer uses an actor neural network to determine the optimal action strategy of power allocations in the non-steady *** with existing power control methods,the proposed method achieves better performance for both static and dynamic operation efficiency *** proposed method optimizes the overall operation efficiency of PCSs effectively under the fluctuating power outputs of the ESS.

关键词： Double-layer Q-learning adaptive power control energy storage station(ESS) operation efficiency power conversion system(PCS)

Effect of blockchain technology initiatives on firms’market value

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Financial Innovation 2023年第1期9卷 1349-1383页

作者： Haji Suleman Ali Feiyan Jia Zhiyuan Lou Jingui Xie School of Management University of Science and Technology of ChinaHefeiChina School of Commerce and Accountancy University of Management and TechnologyLahorePakistan College of Business City University of Hong KongKowloon TongHong Kong Center for Digital Transformation School of ManagementTechnical University of MunichHeilbronnGermany

Despite blockchain’s potential to transform corporations by providing new ways of organizing business processes and handling information,extant research pays inadequate attention to how and under what conditions blockchain technology provides additional financial value for *** on the efficient market hypothesis and signaling theory,we examined the relationship between firms’blockchain use,development announcements,and stock market *** used the event study methodology to analyze a sample of blockchain projects initiated by US firms between 2016 and *** sample contains 114 firm-event *** findings show that the average abnormal return over a 2 days event period(including the day of the announcement and the day after the announcement)was *** positive stock market reaction is even more substantial when firms announce blockchain projects that focus on saving cost or *** findings also indicate that blockchain announcements tend to elicit more positive market reactions from smaller *** analyzed 249 firm-event observations containing firms from around the world and conclude that blockchain technology has a non-significant long-term impact on operating *** contingency approach adopted in our research provides advice for selecting the right mix of blockchain investment initiatives that is most suitable for a given organizational context.

关键词： Blockchain operation efficiency Time and cost saving Stock returns Event study