중소부품제조업에의 VMI에 대한 물류성과요인에 관한 연구

이명복,이부경,양광모,강경식 한국유통정보학회 2006 유통정보학회지 Vol.9 No.1

Sliding Mode Predictive Active Fault-tolerant Control Method for Discrete Multi-faults System

Pu Yang,Zhangxi Liu,Dejie Li,Zhiqing Zhang,Zixin Wang 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.3

For discrete systems with sensor and actuator failures, this paper proposes an observer that can estimate both sensor failures and actuator failures and designs a sliding mode predictive fault-tolerant control method based on an improved whale optimization algorithm. First, a proportional-integral observer that can observe actuator fault and sensor fault is designed to estimate the value of faults, which greatly improves the work efficiency. After that, a global sliding mode surface is designed as a prediction model, so that the initial state of the system is located on the sliding mode surface to avoid the instability of the sliding mode approaching the process. The reference trajectory of a power function with uncertainty and disturbance compensation is designed to reduce the bad influence of uncertainty and disturbance on the system and suppress chattering greatly. Meanwhile, in the rolling optimization part, an improved whale optimization algorithm(IWOA) is designed to optimize the control law. Finally, the simulation results on the four-rotor helicopter simulation platform show the practicability and superiority of the algorithm.

Nonsingular Fixed-time Consensus Tracking for Heterogeneous Multi-agent Systems With External Disturbances and Actuator Faults

Pu Yang,Yu Ding,Ke-Jia Feng,Zi-Wei Shen 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.3

This paper studies the leader-follower consensus tracking for a group of heterogeneous multi-agent systems with nonlinear hybrid order dynamics, external disturbances and actuator faults. First, a novel finite-timeobserver is designed based on a combination of high-order sliding mode and dual layers adaptive rules to realizefast estimation and compensation of disturbances and faults. Then the fixed-time consensus protocols are achievedwith the aid of a novel sliding mode surface. Additionally, the proposed protocols solve the singularity by introducing a continuous sinusoid function. The distributed control protocols are designed for all followers with first-orderor second-order dynamics to achieve synchronization with the leader. Finally, the effectiveness of the algorithm isverified by simulation.

Barrier Function Based Adaptive Global Sliding Mode Fault-tolerant Control of Quad-rotor UAV

Pu Yang,Peng Liu,HuiLin Geng,ChenWan Wen,Bin Jiang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.3

In this paper, Barrier function based adaptive global sliding mode fault-tolerant control and its application in quad-rotor UAV system are studied. Firstly, the global sliding mode surface is combined with Barrier function based adaptive sliding mode control, which omits the approach process of phase I of traditional Barrier adaptive sliding mode motion, thus improving the rapidity and accuracy of the algorithm. Secondly, the Barrier function adaptive law is used to adjust the gain of the switching term, so that the controller gain can change with the amplitude of the total disturbance in a timely and accurate manner, avoiding the overestimation problem and thus reducing the chattering of the control signal. Finally, the experimental results on the fault-tolerant control platform for multi-rotor UAVs prove the effectiveness and superiority of the proposed algorithm.

Emerging 3D bioprinting applications in plastic surgery

Yang Pu,Ju Yikun,Hu Yue,Xie Xiaoyan,Fang Bairong,Lei Lanjie 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00

Plastic surgery is a discipline that uses surgical methods or tissue transplantation to repair, reconstruct and beautify the defects and deformities of human tissues and organs. Three-dimensional (3D) bioprinting has gained widespread attention because it enables fine customization of the implants in the patient's surgical area preoperatively while avoiding some of the adverse reactions and complications of traditional surgical approaches. In this paper, we review the recent research advances in the application of 3D bioprinting in plastic surgery. We first introduce the printing process and basic principles of 3D bioprinting technology, revealing the advantages and disadvantages of different bioprinting technologies. Then, we describe the currently available bioprinting materials, and dissect the rationale for special dynamic 3D bioprinting (4D bioprinting) that is achieved by varying the combination strategy of bioprinting materials. Later, we focus on the viable clinical applications and effects of 3D bioprinting in plastic surgery. Finally, we summarize and discuss the challenges and prospects for the application of 3D bioprinting in plastic surgery. We believe that this review can contribute to further development of 3D bioprinting in plastic surgery and provide lessons for related research. Graphical Abstract

Study on the Sliding Mode Fault Tolerant Predictive Control Based on Multi Agent Particle Swarm Optimization

Pu Yang,Ruicheng Guo,Xu Pan,Tao Li 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.5

For a class of uncertain discrete-time systems with time varying delay, the problem of robust faulttolerantcontrol for such systems is studied by combining the design of sliding mode control (SMC) and modelpredictive control (MPC). A sliding mode fault tolerant predictive control based on multi agent particle swarmoptimization (PSO) is presented, and the design, analysis and proof of the scheme are given in detail. Firstly,the sliding mode prediction model of the system is designed by assigning poles of the output error of the system. The model has time varying characteristics, and it can improve the motion quality of the system while ensuringthe sliding mode is stable. Secondly, a new discrete reference trajectory considering time-delay systems subjectedsimultaneously to parameter perturbations and disturbances is proposed, which not only can ensure that the stateof the system has good robustness and fast convergence in the process of approaching sliding mode surface, butalso can inhibit chattering phenomenon. Thirdly, the multi agent PSO improves the receding-horizon optimization,which can quickly and accurately solve the control laws satisfying the input constraints, and can effectively avoidfalling into local extrema problem of the traditional PSO. Finally, the theoretical proof of robust stability of theproposed control scheme is given. Experimental results of quad-rotor helicopter semi physical simulation platformshow that the state of uncertain discrete-time systems with time varying delay is stable under the action of theproposed control scheme in this paper. The advantages of fast response, less overshoot and small control chatteringprove the feasibility and effectiveness of the proposed control scheme.

Fault-tolerant Consensus of Leader-following Multi-agent Systems Based on Distributed Fault Estimation Observer

Pu Yang,Ben Ma,Yan Dong,Jianwei Liu 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.5

This paper is concerned with the fault-tolerant consensus control problem for leader-following multiagent systems with actuator faults and external disturbance. Firstly, by employing the relative output estimation errors with respect to the corresponding neighbours and the leader, a distributed fault estimation observer is constructed for each follower and the established global estimation error system is proven to be asymptotically stable. Secondly, based on the obtained fault estimation, the active fault-tolerant consensus control protocol for each follower is proposed with the utilization of the relative output measurements rather than the state of the systems. Under this control protocol, the actuator faults can be compensated and the influence of disturbance can be eliminated as well. Moreover, it is worth noticing that the process of designing the fault estimation observer and the fault-tolerant controller is separated and their performances are considered simultaneously to simplify the design procedures. Finally, an illustrative example is presented to demonstrate the applicability and the effectiveness of the obtained results.

A comprehensive review of polysaccharide biopolymers for enhanced oil recovery (EOR) from flask to field

Wanfen Pu,Chao Shen,Bing Wei,Yang Yang,Yibo Li 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-

To assist in understanding the progress of polysaccharide biopolymers in EOR, this review collects and summarizes the available data for the first time and thoroughly discusses the structure–property–EOR performance relationship from flask to field scale application. Attentions were given to xanthan, scleroglucan, hydroxyethylcellulose (HEC), carboxymethycellulose (CMC), welan gum, guar gum, schizophyllan, and other newly developed family members. This review provides a synopsis of EOR polysaccharides, which are rapidly emerging as eco-friendly and tough injectants compared to synthetic polymers.

Strategies of Functional Food for Cancer Prevention in Human Beings

Zeng, Ya-Wen,Yang, Jia-Zheng,Pu, Xiao-Ying,Du, Juan,Yang, Tao,Yang, Shu-Ming,Zhu, Wei-Hua Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.3

Functional food for prevention of chronic diseases is one of this century's key global challenges. Cancer is not only the first or second leading cause of death in China and other countries across the world, but also has diet as one of the most important modifiable risk factors. Major dietary factors now known to promote cancer development are polished grain foods and low intake of fresh vegetables, with general importance for an unhealthy lifestyle and obesity. The strategies of cancer prevention in human being are increased consumption of functional foods like whole grains (brown rice, barley, and buckwheat) and by-products, as well some vegetables (bitter melon, garlic, onions, broccoli, and cabbage) and mushrooms (boletes and Tricholoma matsutake). In addition some beverages (green tea and coffee) may be protective. Southwest China (especially Yunnan Province) is a geographical area where functional crop production is closely related to the origins of human evolution with implications for anticancer influence.

Coevolution between Human's Anticancer Activities and Functional Foods from Crop Origin Center in the World

Zeng, Ya-Wen,Du, Juan,Pu, Xiao-Ying,Yang, Jia-Zhen,Yang, Tao,Yang, Shu-Ming,Yang, Xiao-Meng Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.6

Cancer is the leading cause of death around the world. Anticancer activities from many functional food sources have been reported in years, but correlation between cancer prevalence and types of food with anticancer activities from crop origin center in the world as well as food source with human migration are unclear. Hunger from food shortage is the cause of early human evolution from Africa to Asia and later into Eurasia. The richest functional foods are found in crop origin centers, housing about 70% in the world populations. Crop origin centers have lower cancer incidence and mortality in the world, especially Central Asia, Middle East, Southwest China, India and Ethiopia. Asia and Africa with the richest anticancer crops is not only the most important evolution base of humans and origin center of anticancer functional crop, but also is the lowest mortality and incidence of cancers in the world. Cancer prevention of early human migrations was associated with functional foods from crop origin centers, especially Asia with four centers and one subcenter of crop origin, accounting for 58% of the world population. These results reveal that coevolution between human's anticancer activities associated with functional foods for crop origin centers, especially in Asia and Africa.