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Qing Guo,Zhenlei Chen,Yao Yan,Wenying Xiong,Dan Jiang,Yan Shi 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.2
Lower limb exoskeleton is a typical wearable robot to assist human motion and improve physiological power. However, the control performance and stability are affected by some unknown model parameters and control algorithms. Therefore, it is necessary to investigate the model parametric identification and the control design of lower extremity exoskeleton. Firstly, the two degree-of-freedom (DoF) exoskeleton model is constructed by the Lagrange technique. Then the biogeography-based learning particle swarm optimization (BLPSO) is used to optimize the B-spline function parameters and the smooth stimulated trajectories is designed. Meanwhile, the BLPSO is also adopted to identify unknown model parameters of the exoskeleton based on the torques and the joint angles. To decline the negative effect of parametric identification error of exoskeleton, the passive backstepping controller is proposed to improve the tracking performance of human-robot motion. Furthermore, the active admittance controller is adopted to improve the motion comfort of tester. Finally, the comparative experimental results are verified on the platform, which show the BLPSO algorithm has better parametric identification accuracy than PSO and GA. Furthermore, the comparative results have verified that the proposed controller can improve the tracking behavior and reduce the human-robot interaction torque in wearable motion.
Optimal Grade Transition for Quality Control of Continuous Polymerization Reactor
Qing Guo,Masaru Noda,Hirokazu Nishitani 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
An optimal grade transition policy is essential when several grades of polymers are produced in the same continuous stirred tank reactor. We discuss an optimal grade transition to minimize the raw material and energy costs of the transition operation as well as to shorten the transition time. We show that a combination of regulatory control and dynamic optimization is very effective for the optimal grade transition of a continuous polymerization reactor.
LOAD TRANSFER ANALYSIS OF A BUS BAY SECTION UNDER STANDARD ROLLOVER TEST USING U* M INDEX
Qingguo Wang,Wei Zhou,Igor Telichev,Christine Qiong Wu 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.4
Bus rollover accidents are receiving increasing attention due to the associated high fatality rate. In order to improve the bus structural performance during the rollover collision, it is necessary to investigate how the impact force is transferred within the bus superstructure. This paper introduced a method for studying the load transfer behavior of the bus superstructure during the standard rollover test by using the U * M index. A bus bay section was used as the sample structure to demonstrate the proposed method. The result of the paper reveals that the load transfer analysis based on the U * M index can provide engineers with the insight of the structural issues and the direction to improve the structural performance, which cannot be accomplished through the conventional finite element analysis.
Qingguo Jiang,Wei Shen,Chao Wang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.5
The time dependent vehicle routing problem (TDVRP) is defined as a vehicle fleet of fixed capacities serves customers of fixed demands from a central depot with consideration of road networks conditions. The travel time between two customers or between customer and the depot depends on the distance of the two points and time of a day. A mathematical model is formulated for the TDVRP problem and a simulated annealing (SA) based improvement method is proposed for solving it. The main objective is to minimize the number of vehicles and the second objective is to minimize the total travel distance of the vehicles. The proposed approach was tested on the 56 test problems with 100 customers from Figliozzi’s benchmark, and results show that the improvement metaheuristic could get better solutions than Figliozzi’s algorithm in the different time dependent speeds function within an accepted computational time.
Recent Progress of Gr/Si Schottky Photodetectors
Qingguo Shao,Hao Qi,Chao Li,Kunpeng Cai,Jianxia Dong,Xuhui Liu,Ning Cao,Xiaobei Zang 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.2
By combing the carrier mobility of graphene with the excellent light absorption properties of silicon, ultra-shallow Schottkyjunction can be obtained, and can exist stably for a long time. The photoelectric property of Schottky junction is determinednot only by graphene and silicon semiconductor layer, but also by the interface layer between the two. Through a series ofoptimizations, the performance of graphene/silicon Schottky junction photodetectors can be continuously improved. Asa result, graphene/silicon Schottky junctions more promising for the development of next generation photodetectors withits stability, ease of preparation and sensitivity. In this review, we firstly give a brief introduction to Gr Schottky junctionphotodetectors, and then present a comprehensive review on the recent progress of optimizing Gr/Si Schottky junction photodetectorsin the past few years, including light management engineering, band engineering and interfacial engineering. Finally, the current challenges are summarized and further perspectives are outlined.
Brief Analysis on Earlier Clothing Photography of China
sun qingguo 한국동양예술학회 2021 동양예술 Vol.51 No.-
After its generation in western countries, photography was applied to clothing photography and many other fields. At end of Qing Dynasty in China, the technology and facilities for photography was imported into China and began to develop. This laid sound foundation for development of Chinese clothing photography. This article starts with the development foundation of earlier clothing photography in China, concluding absence of a clear vision on fashion industry of the time. In this sense, clothing photography is a more accurate description to photographs for clothes and costumes of the time. Most clothing photographers of the time used to be painters, reflecting styles of Chinese drawing of the time. This article includes analysis on clothing photograph analysis of, i.e.: costumes for group pictures of assemblies and figure images. The point of works is to make detailed records on figures. Secondly, equipment and technologies for photography were imported from western countries. With enlargement of photographers as amateurs and professionals, technologies began to improve and the styles began to diversify from naturalism into artistic. All these have contributed to development of clothing photographs.
Liu Qingguo,Zhao Nan,Zou Yanan,Ying Hanjie,Dong Liu,Chen Yong 한국미생물·생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.8
In this study, yeast cell immobilization was carried out in a packed bed reactor (PBR) to investigate the effects of the volumetric capacity of carriers as well as the different fermentation modes on fuel ethanol production. An optimal volumetric capacity of 10 g/l was found to obtain a high cell concentration. The productivity of immobilized cell fermentation was 16% higher than that of suspended-cell fermentation in batch and it reached a higher value of 4.28 g/l/h in repeated batches. Additionally, using this method, the ethanol yield (95.88%) was found to be higher than that of other tested methods due to low concentrations of residual sugars and free cells. Continuous ethanol production using four bioreactors showed a higher productivity (9.57 g/l/h) and yield (96.96%) with an ethanol concentration of 104.65 g/l obtained from 219.42 g/l of initial total sugar at a dilution rate of 0.092 h-1. Furthermore, we reversed the substrate-feed flow directions in the in-series bioreactors to keep the cells at their highest activity and to extend the length of continuous fermentation. Our study demonstrates an effective method of ethanol production with a new immobilized approach, and that by switching the flow directions, traditional continuous fermentation can be greatly improved, which could have practical and broad implications in industrial applications.