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| 1 | Dynamic design of a nonlinear energy sink with NiTiNOL-steel wire ropes based on nonlinear output frequency response functions显示文摘A novel vibration isolation device called the nonlinear energy sink(NES)with NiTiNOL-steel wire ropes(NiTi-ST)is applied to a whole-spacecraft system.The NiTi-ST is used to describe the damping of the NES,which is coupled with the modified Bouc-Wen model of hysteresis.The NES with NiTi-ST vibration reduction principle uses the irreversibility of targeted energy transfer(TET)to concentrate the energy locally on the nonlinear oscillator,and then dissipates it through damping in the NES with NiTi-ST.The generalized vibration transmissibility,obtained by the root mean square treatment of the harmonic response of the nonlinear output frequency response functions(NOFRFs),is first used as the evaluation index to analyze the whole-spacecraft system in the future.An optimization analysis of the impact of system responses is performed using different parameters of NES with NiTi-ST based on the transmissibility of NOFRFs.Finally,the effects of vibration suppression by varying the parameters of NiTi-ST are analyzed from the perspective of energy absorption.The results indicate that NES with NiTi-ST can reduce excessive vibration of the whole-spacecraft system,without changing its natural frequency.Moreover,the NES with NiTi-ST can be directly used in practical engineering applications. | Yewei ZHANG Kefan XU Jian ZANG Zhiyu NI Yunpeng ZHU Liqun CHEN | 2019 | Applied Mathematics and Mechanics(English Edition)2019，40，12： | 4 |
| 2 | Accelerating an FPGA-Based SAT Solver by Software and Hardware Co-design显示文摘The Boolean Satisfiability (SAT) problem is the key problem in computer theory and application. Field-programmable gate array (FPGA) has been ad-dressed frequently to accelerate the SAT solving process in the last few years owing to its parallelism and flexibility. We have proposed a novel SAT solver based on an improved local search algorithm on the reconfigurable hardware platform. The new software preprocessing procedure and hardware architecture are involved to solve large-scale SAT problems instances. As compared with the past solvers, the proposed solver has the following advantages:the preprocessing technology can strongly improve the efficiency of solver;the strategy of strengthening the variable selection can avoid the same variable flipped continuously and repeatedly. It reduces the possibility of search falling into local minima. The experimental results indicate that the solver can solve problems of up to 32K variables/128K clauses without off-chip memory banks, and has better performance than previous works. | MA Kefan XIAO Liquan ZHANG Jianmin LI Tiejun | 2019 | Chinese Journal of Electronics2019，28，5： | 3 |
| 3 | Capacitive Imaging Technique for the Inspection of Composite Sucker Rod显示文摘Composite sucker rod has been extensively used due to its high strength, light weight and corrosion resistive nature. However, such composite sucker rod is diffcult for conventional non-destructive evaluation(NDE) techniques to inspect because of its complex material and/or structure. It is thus useful to embark research on developing novel NDE technique to comply the inspection requirement. This work demonstrates the feasibility of using the capacitive imaging(CI) technique for the inspection of composite sucker rod. Finite element(FE) models were constructed in COMSOL to simulate the detection of defects in the glass-fiber layer and on the carbon core surface. An FE Model based inversion method is proposed to obtain the profile of the carbon core. Preliminary CI experimental results are then presented, including the detection of surface wearing defect in the glass-fiber layer, and obtaining the profile of the carbon core. A set of accelerated aging experiments were also carried out and the results indicate that the CI technique is potentially useful in evaluating the ageing status of such composite sucker rod. The CI technique described in this work shows great potential to target some challenging tasks faced in the non-destructive evaluation of composite sucker rod, including quality control, defect detection and ageing assessment. | Kefan Wang Xiaokang Yin Chen Li Wei Li Guoming Chen | 2019 | Chinese Journal of Mechanical Engineering2019，32，6： | 2 |
| 4 | A highly reliable embedding algorithm for airborne tactical network virtualization显示文摘The evolution of airborne tactical networks(ATNs)is impeded by the network ossification problem.As a solution,network virtualization(NV)can provide a flexible and scalable architecture where virtual network embedding(VNE)is a key part.However,existing VNE algorithms cannot be optimally adopted in the virtualization of ATN due to the complex interference in aircombat field.In this context,a highly reliable VNE algorithm based on the transmission rate for ATN virtualization(TR-ATVNE)is proposed to adapt well to the specific electromagnetic environment of ATN.Our algorithm coordinates node and link mapping.In the node mapping,transmission-rate resource is firstly defined to effectively evaluate the ranking value of substrate nodes under the interference of both environmental noises and enemy attacks.Meanwhile,a feasible splitting rule is proposed for path splitting in the link mapping,considering the interference between wireless links.Simulation results reveal that our algorithm is able to improve the acceptance ratio of virtual network requests while maintaining a high revenue-to-cost ratio under the complex electromagnetic interference. | MIAO Jingcheng LYU Na CHEN Kefan CHEN Zhuo GAO Weiting | 2021 | Journal of Systems Engineering and Electronics2021，32，6： | 2 |
| 5 | Dynamics Analysis of Active Variable Stiffness Vibration Isolator for Whole-Spacecraft Systems Based on Nonlinear Output Frequency Response Functions显示文摘In order to improve the harsh dynamic environment experienced by heavy rockets during different external excitations,this study presents a novel active variable stiffness vibration isolator(AVS-VI)used as the vibration isolation device to reduce excessive vibration of the whole-spacecraft isolation system.The AVS-VI is composed of horizontal stiffness spring,positive stiffness spring,parallelogram linkage mechanism,piezoelectric actuator,acceleration sensor,viscoelastic damping,and PID active controller.Based on the AVS-VI,the generalized vibration transmissibility determined by the nonlinear output frequency response functions and the energy absorption rate is applied to analyze the isolation performance of the whole-spacecraft system with AVS-VI.The AVS-VI can conduct adaptive vibration suppression with variable stiffness to the whole-spacecraft system,and the analysis results indicate that the AVS-VI is efTective in reducing the extravagant vibration of the whole-spacecraft system,where the vibration isolation is decreased up to above 65%under different acceleration excitations.Finally,different parameters of AVS-VI are considered to optimize the whole-spacecraft system based on the generalized vibration transmissibility and the energy absorption rate. | Kefan Xu Yewei Zhang Yunpeng Zhu Jian Zang Liqun Chen | 2020 | Acta Mechanica Solida Sinica2020，33，6： | 1 |
| 6 | Group decision-making in an unconventional emergency situation using agile Delphi approach显示文摘 | Kefan Xie Jia Liu Gang Chen Pan Wang Sohail S. Chaudhry | 2012 | Information Technology and Management2012，，4： | 1 |
| 7 | Modeling technological innovation risks of an entre- preneurial team usingsystem dynamics: An agent - based perspective 显示文摘 | DESHENG DASH WU XIE KEFAN LIU HUA ZHAO SHI DA- VID L OLSON | 2010 | Technological Forecasting & Social Change2010，，： | 1 |
| 8 | Integrated analysis of human influenza A(H1N1)virus infectionrelated genes to construct a suitable diagnostic model显示文摘The genome characteristics and structural functions of coding proteins correlate with the genetic diversity of the H1N1 virus,which aids in the understanding of its underlying pathogenic mechanism.In this study,analyses of the characteristic of the H1N1 virus infection-related genes,their biological functions,and infection-related reversal drugs were performed.Additionally,we used multi-dimensional bioinformatics analysis to identify the key genes and then used these to construct a diagnostic model for the H1N1 virus infection.There was a total of 169 differently expressed genes in the samples between 21 h before infection and 77 h after infection.They were used during the protein-protein interaction(PPI)analysis,and we obtained a total of 1725 interacting genes.Then,we performed a weighted gene co-expression network analysis(WGCNA)on these genes,and we identified three modules that showed significant potential for the diagnosis of the H1N1 virus infection.These modules contained 60 genes,and they were used to construct this diagnostic model,which showed an effective prediction value.Besides,these 60 genes were involved in the biological functions of this infectious virus,like the cellular response to type I interferon and in the negative regulation of the viral life cycle.However,20 genes showed an upregulated expression as the infection progressed.Other 36 upregulated genes were used to examine the relationship between genes,human influenza A virus,and infection-related reversal drugs.This study revealed numerous important reversal drug molecules on the H1N1 virus.They included rimantadine,interferons,and shikimic acid.Our study provided a novel method to analyze the characteristic of different genes and explore their corresponding biological function during the infection caused by the H1N1 virus.This diagnostic model,which comprises 60 genes,shows that a significant predictive value can be the potential biomarker for the diagnosis of the H1N1 virus infection. | WENBIAO CHEN KEFAN BI JINGJING JIANG XUJUN ZHANG HONGYAN DIAO | 2021 | BIOCELL2021，45，4： | 1 |
| 9 | Entrepreneurial team's risk - based decision - making: A dynamic game analysis Original Research Article 显示文摘 | Xie Kefan Chen Gang Desheng Dash Wu | 2011 | International Journal of Production Economics2011，134，1： | 1 |
| 10 | Modeling technological innovation risks of an entrepreneurial team u- sing system dynamics: An agent-based perspective 显示文摘 | Wu Desheng Xie Kefan Liu Hua | 2010 | Technological Forecasting and Social Change2010，77，6： | 1 |
| 11 | Mod- eling technological innovation risks of an entrepre- neurial team using system dynamics: An agent- based perspective 显示文摘 | Desheng Dash Wu Xie Kefan Liu Hua | 2010 | Technological Forecasting and Social Change2010，77，6： | 1 |
| 12 | High mass loading Ni_(4)Co_(1)-OH@CuO core-shell nanowire arrays obtained by electrochemical reconstruction for alkaline energy storage显示文摘The design of three-dimensional(30)core-shell hetercistructures is an efficient method to achieve high mass specific capacity of electroactive materials under high mass loading.In this work,porous Ni_(4)Co1-0H nanosheets with a mass loading of 7.7 mg·cm^(-2) are obtained by using Ni_(4)Cor(NO_(3))_(2)(0H)_(4) supported on the CuO nanowires as precursors via an unavoidable electrochemically induced phase reconstruction.During the electrochemical reconstruction process,the N03-anions in Ni_(4)Cor(N0_(3))_(2)(0H)_(4) are easily replaced by OH-anions in the electrolyte.The phase reconstruction is accompanied by the decrease of ionic diffusion.:resistance and the increase of pore volume,and the shift of binding energy.The obtained Ni4Co1-0H nanosheets show a high:mass specific capacity of 363.6 mAh·g^(-1) at 5 mA·cm^(-2).The as-fabricated alkaline hybrid supercapacitor and Ni-Zn battery deliver high energy density of 293.1 and 604.9 Wh·kg^(-1),respectively,indicating.excellent alkaline energy storage performance. | Yawei Yu Xiulan Hu Shuai Wang Handan Qiao Zeyu Liu Kefan Song Xiaodong Shen | 2022 | Nano Research2022，15，1： | 1 |
| 13 | Research on Group Decision-making Mechanism of Internet E- mergency Management显示文摘 | Xie Kefan Chen Gang Wu Qian | 2010 | Communications in Computer and Information Science CCIS2010，113，： | 1 |
| 14 | A Preliminary Study on Collaborative Management of Intellectual Property in Supply Chain Enterprises 显示文摘 | Liu Jieming Xie Kefan Wu Qian | 2008 | WiCOM 2008 International Confer- ence2008，，10： | 1 |
| 15 | Learning Mech- anism of Entrepreneurial Team' s Risk Decision Making: A Dynamic Game Analysis 显示文摘 | Xie Kefan Chen Gang Dash Wu Wu Qian | 2011 | International Journal of Produc- tion Economics2011，134，1： | 1 |
| 16 | Effects of Organic Fertilizers Made from Distiller's Grains on the Growth and Development of Flue-cured Tobacco显示文摘Pot experiments were conducted to study the effects of different organic fertilizers made from distiller's grains on the physiological characteristics and growth of flue-cured tobacco. The results showed that the agronomic traits and biomass of flue-cured tobacco in the three treatments were higher than that of the control group,and the mixed application of different organic fertilizers made from distiller's grains and compound fertilizer could promote the growth and development of flue-cured tobacco significantly. | Sheng JIANG Miao YANG Fei XIONG Yonghui ZHANG Chun XIA Jiao GUAN Kefan CAI Juntao HE Yuangai ZHANG Fei WANG Fuzhao NIAN | 2018 | Agricultural Biotechnology2018，7，3： | 1 |
| 17 | Modeling technological innovation risks of an entrepreneurial team using system dynamics: An agent-based perspective显示文摘 | Desheng Dash Wu Xie Kefan Liu Hua Zhao Shi David L. Olson | 2010 | Technological Forecasting & Social Change2010，，6： | 1 |
| 18 | Influence of Zn ion implantation on structures and field emission properties of multi-walled carbon nanotube arrays显示文摘The structures and field emission properties of multi-walled carbon nanotube arrays implanted with Zn+ by MEVVA ion implanter have been investigated.The results revealed that Zn+implantation induced structural damage and that the top of carbon nanotubes with multi-layered graphite structure were transformed into carbon nanowires with amorphous structure.Meanwhile,C:Zn solid solution was synthesized after Zn+ implantation.The turn-on field and threshold field were 0.80 and 1.31 V/μm,respectively for original multi-walled carbon nanotube arrays and were reduced to 0.66 and 1.04 V/μm due to the synthesis of C and Zn composite,in which the work function was reduced after low doses of Zn+implantation.It is indicated that low doses of Zn+implantation can improve field emission performance of multi-walled carbon nanotube arrays.Otherwise,high doses of Zn+implantation can reduce field emission properties of multi-walled carbon nanotube arrays,because radiation damage reduces the electric field enhancement factor. | CHEN KeFan,DENG JianHua,ZHAO Fei,CHENG GuoAn &ZHENG RuiTing Key Laboratory of Beam Technology and Material Modification of Ministry of Education,College of Nuclear Science and Technology,Beijing Normal University,Beijing100875,China | 2010 | Science China(Technological Sciences)2010，53，3： | 1 |
| 19 | Valorizing carbon dioxide via electrochemical reduction on gas-diffusion electrodes显示文摘The electrochemical carbon dioxide(CO_(2))reduction provides a means to upgrade CO_(2)into value-added chemicals.When powered by renewable electric-ity,CO_(2)electroreduction holds the promise of chemical manufacturing with carbon neutrality.A commercially relevant CO_(2)electroreduction process should be highly selective and productive toward desired products,energetically efficient for power conversion,and stable for long-term operation.To achieve these goals,designing gas-diffusion catalytic electrodes and prototyping reactors built upon in-depth understandings of the reaction mechanisms are of para-mount importance.In this review,the fundamentals of gas-diffusion electrodes are briefly presented.Then,the most recent advances in developing high-performance CO_(2)reduction using gas-diffusion electrodes are overviewed.Reactor engineering aiming at enhancing productivity,energy efficiency,CO_(2)single-pass utilization,and operating lifetime is further discussed.Challenges in developing CO_(2)electroreduction systems are included.The prospects for advancing CO_(2)electroreduction toward practical applications are also narrated. | Yuqing Luo Kefan Zhang Yanguang Li Yuhang Wang | 2021 | InfoMat2021，3，12： | 1 |
| 20 | A catastrophe model on the evaluation and classification of mine disaster rescue measures *显示文摘 | Qian Wu Kefan Xie Zhiyue Chen | 2012 | Systems Engineering Procedia2012，，： | 1 |
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