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L2-gain Analysis and Synthesis of Saturated Switched Linear Systems
Xinquan Zhang,Wenhua Tao,Qingyu Su 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.11
The problem of L2-gain analysis and anti-windup compensators design is investigated for saturated switched linear systems via the single Lyapunov function method. Firstly, a sufficient condition about tolerable disturbances is obtained, under which the state trajectory starting from the origin will remain inside a bounded set. Then over this set of tolerable disturbances, we obtain the upper bound of the restricted L2-gain. Furthermore, the anti-windup compensation gains and the switched law, which aim to determine the maximum disturbance tolerance capability and the minimum upper bound of the restricted L2-gain, are presented by solving constraint optimization problem. Finally we give a numerical example to demonstrate the effectiveness of the proposed method.
Stability Analysis and Antiwindup Design of Switched Linear Systems with Actuator Saturation
Xinquan Zhang,Chengli Su 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.3
This paper investigates the stability analysis and anti-windup design problem for a class of switched linear systems with input saturation by using the multiple Lyapunov functions method. The premise is that a set of linear dynamic output controllers have been designed to stabilize the closed-loop system without saturation. Then, the anti-windup compensators and the switching law are designed which can enlarge the domain of attraction of the closed-loop system. Finally, the anti-windup compensators and the switching law are presented by solving an optimization problem with constraints. A numerical example is shown to demonstrate the effectiveness of proposed method.
중국제조기업의 시장지향성과 친환경공급사슬 지향성이 기업성과에 미치는 영향
주신전(Xinquan Zhou),최석범(Seok-Beom Choi) 한국관세학회 2014 관세학회지 Vol.15 No.1
Market-oriented corporations can take notice of the changes in the external environment and implement proper response measures. In this sense, Green Supply Chain Management(Green SCM) plays an important role in acquiring a competitive advantage in green global business. Corporations’ involvement in Green SCM can provide the best response to the environmental regulations in early stages to create market opportunities and secure an engine for the growth in the future. The existing researches for Green SCM were conducted from various angles but lack investigative studies on the correlations of performance with an approach for the corporation’s strategic purposes. Therefore it is necessary to research the impact on the corporation’s improved performance in the course of corporations market orientation responding to the market information concerning environmental issues. The purpose of this thesis is to contribute the effective establishment of Green Supply Chain in Chinese manufacturing companies and the increase of their performance by assessing the relationship between market orientation and green supply chain orientation and analyzing the manifestations of corporation’s performance through the execution of Green SCM and the innovation of environmental technology. The research was conducted through both literature survey and empirical studies. This thesis examined Green SCM practice status in Chinese manufacturing companies and reviewed relevant concepts and theories such as market orientation, green supply chain orientation, innovation of environmental technology, and business performance. The previous researches were studied to draw a research model of this thesis from an integrated view. 400 questionnaires were distributed among Chinese manufacturing companies and 318 copies were returned and utilized for hypothesis verification.
Kuijing Song,Xinquan Liu,Yukai Ji,Yong Wei,Junrui Luo,Fei Liu,Dashuang Liu,Zhihong Zhong 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4
Aluminum/magnesium (Al/Mg) alloys have good metallurgical compatibility as well as similar melting and recrystallizationtemperatures. Therefore, the formation of deleterious IMCs is considered as a major problem in dissimilar Al/Mgalloys joining. In this paper, the metallurgical reaction behavior and atomic diffusion in Al/Mg solid state joining interfaceare studied. Based on the thermodynamic, kinetic and crystallographic characteristics of ordered phase transformation andatomic diffusion database, a phase field calculation framework of the polycrystalline β–Al3Mg2 and γ–Al12Mg17 evolutionis developed. Diffusivity, D and interface mobility, M, which significant kinetic parameters are defined as alloy compositionsand joining conditions dependent. By a series of simulation, it is proved the simulated interdiffusion microstructuralcharacteristics and element distribution across the joining interface are in coincidence with the corresponding experimentaldata. The thermally activated IMC evolution in diffusion bonding is in thermodynamic equilibrium, while accelerated IMCevolution in friction stir welding results from thermomechanically activated D and M. The present study contributes to theunderstanding of interfacial microstructures evolution in solid state joining of dissimilar alloys.
Linkai Huang,Xinquan Zhang,Surong Shuai,Fang Li 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
Genetic variation within and among 12 populations of whip grass in south China were investigated using inter-simple sequence repeat (ISSR) and sequence-related amplified polymorphism (SRAP). High genetic diversity was found in whipgrass by two molecular makers (PPB=86.21%, I=0.357 based on ISSR; PPB=82.21%, I=0.352 based on SRAP). However, there was relatively low genetic diversity at population levels. A high degree of genetic differentiation among populations was detected based on different measures and different molecular markers. We also found that SRAP markers were more efficient than ISSR markers in this species. Based on these findings, sampling strategy was proposed for successfully utilizing the genetic resource of this species.
Rui Huang,Xinquan Zhang,Boon Ping Ng,A. Senthil Kumar,Kui Liu 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.1
Fresnel-based concentrated photovoltaic (CPV) solar power systems have been proven effective to significantly enhance the photoelectric conversion efficiency, but a standard-size solar plant will require an extremely large amount of polymer radial Fresnel lenses. Roll-to-roll (R2R) manufacturing is a high-throughput technology to mass produce high-quality functional optical polymer fi lm. In this paper, we have firstly studied a complete manufacturing cycle for R2R embossing of radial Fresnel lens polymer fi lm for CPV systems, in terms of polymer lens design, roller mold machining, R2R embossing and optical performance test. Instead of wrapping an electroplated metal sheet onto the roller in conventional R2R process, the lens pattern array is directly machined using a 5-axis ultra-precision machining system to guarantee its surface quality and accuracy. Optical performance evaluation for the manufactured polymer fi lm using a reference solar cell is conducted, and results have shown that radial Fresnel lens on the polymer fi lm can achieve a sunlight concentration ratio 3.9 × times that of linear lenses with a much smaller receiving area. This study has explored the feasibility for R2R embossing of optical polymer fi lm, an industry-applicable and cost-effective technology for mass production of high-quality Fresnel lenses to be used in high-efficiency CPV systems.
Resource Allocation for Device-to-Device Communications Underlaying Cellular Networks
Tao He,Xinquan Ye,Lieying Luo 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.5
Device-to-Device (D2D) communications potentially can improve spectrum efficiency because of resource spatial reuse. There are two possibilities for D2D resource allocation: contention-based resource allocation and scheduling-based resource allocation. In this paper, these resource allocation schemes are analyzed. Then, we propose a scheduling-based resource allocation that has the advantage of low scheduling overhead in addition to providing a common design for under the in-network coverage and out-of-network coverage. Simulation results show that the proposed algorithm can increase system throughput by exploring spatial reuse gain and maintain good proportional fairness among D2D communication pairs.
Secured Green Communication Scheme for Interference Alignment Based Networks
Zhibin Xie,Xinquan Geng,Yunfei Chen,Kening Song,Benjamin Panful,Yajun Wang,Yinjie Su,Zhenkai Zhang,Ying Hu 한국통신학회 2020 Journal of communications and networks Vol.22 No.1
In this paper, a new security and green communicationscheme is proposed to the interference-alignment (IA) based networks. To achieve a secured communication, full-duplex receiversare utilized to transmit artificial noise (AN). Both the signals andthe ANs are used to harvest energy to realize green communication. For these reasons, the feasible conditions of this scheme areanalyzed first. Secondly, the average transmission rate, the secrecyperformance and the harvested energy are investigated. Thirdly,an optimization scheme of simultaneous wireless information andpower transfer (SWIPT) is given to optimize the information transmissionand the energy harvesting efficiency. Meanwhile, an improvedIA iteration algorithm is designed to eliminate both the ANand the interference. Furthermore, relay cooperation is consideredand its system performance is analyzed. The simulations show thatthe target average transmission rate is not affected by AN, whilethe secrecy performance can be greatly improved. The energy harvestingefficiency is also better than the traditional schemes. Asexpected, the average transmission rate further is improved withthe relay cooperation.