The control law synthesis, wind tunnel test and engineering properties ofdigital active flutter suppression system (AFSS) are presented.A method ofdiscretization of continuous domain is adopted in the control law desi...The control law synthesis, wind tunnel test and engineering properties ofdigital active flutter suppression system (AFSS) are presented.A method ofdiscretization of continuous domain is adopted in the control law design, and four kindsof control laws are demonstrated during the wind tunnel test with this method. Thewind tunnel test affirms the correctness of the theoretical computation and the test de-sign. The control law is implemented by use of microcomputer and industry controllerin this test. The engineering properties of the active flutter suppression system are pres-ented. The research on a dynamically scaled wing/ store configuration shows that theflutter speed increases by 20% or so and the performance of the system is basically satis-factory.展开更多
This study presents a robustness optimization method for rapid prototyping(RP)of functional artifacts based on visualized computing digital twins(VCDT).A generalized multiobjective robustness optimization model for RP...This study presents a robustness optimization method for rapid prototyping(RP)of functional artifacts based on visualized computing digital twins(VCDT).A generalized multiobjective robustness optimization model for RP of scheme design prototype was first built,where thermal,structural,and multidisciplinary knowledge could be integrated for visualization.To implement visualized computing,the membership function of fuzzy decision-making was optimized using a genetic algorithm.Transient thermodynamic,structural statics,and flow field analyses were conducted,especially for glass fiber composite materials,which have the characteristics of high strength,corrosion resistance,temperature resistance,dimensional stability,and electrical insulation.An electrothermal experiment was performed by measuring the temperature and changes in temperature during RP.Infrared thermographs were obtained using thermal field measurements to determine the temperature distribution.A numerical analysis of a lightweight ribbed ergonomic artifact is presented to illustrate the VCDT.Moreover,manufacturability was verified based on a thermal-solid coupled finite element analysis.The physical experiment and practice proved that the proposed VCDT provided a robust design paradigm for a layered RP between the steady balance of electrothermal regulation and manufacturing efficacy under hybrid uncertainties.展开更多
This paper mainly discusses the following problems: the important meaning and special function of simulation system; the definition, contents and relationship of system and system simulation science; the definition an...This paper mainly discusses the following problems: the important meaning and special function of simulation system; the definition, contents and relationship of system and system simulation science; the definition and technology of simulation system and its equipments; and systematic description and exploration in relation to the developing trend of system simulation science and simulation system technology.展开更多
Objective： To evaluate the value of MSCT and DSA in diagnosing the postoperative recurrence of hepatocellular carcinoma by analyzing the results of these two image examinations. Methods： Seventytwo patients with pos...Objective： To evaluate the value of MSCT and DSA in diagnosing the postoperative recurrence of hepatocellular carcinoma by analyzing the results of these two image examinations. Methods： Seventytwo patients with postoperative recurrence of hepatocellular carcinoma were subjected to MSCT and DSA of their livers. The interval of two examinations was 2 to 14 days. Results： In 51 cases （70.83%）, the recurrent lesions were multiple small nodules （type Ⅰ）, 9 cases （12.36%） were single nodule （type Ⅱ）, and the remaining 12 cases （16.81%） were unequal nodules （type Ⅲ）. The results of two examinations were discrepancy in 10 patients. In 7 cases having positive results in DSA, the number of small nodules in 5 cases displayed by DSA was more than that by MSCT, and 2 cases had negative results in MSCT. In 3 patients having positive results in MSCT, number of small nodules in 2 cases displayed by MSCT was more than that by DSA and 1 case had negative results in DSA. Conclusion： MSCT and DSA had difference in displaying the postoperative recurrent lesions of hepatocellular carcinoma. The combined application of MSCT and DSA would be beneficial to improve the diagnosis of recurrent lesions.展开更多
In today’s world,humanity is immersed in a digital era where technological advances driven by computers permeate everyone’s life.The situation raises the need for computing and engineering education to inform studen...In today’s world,humanity is immersed in a digital era where technological advances driven by computers permeate everyone’s life.The situation raises the need for computing and engineering education to inform students of their responsibilities to society and their preparation to enter higher education and the workplace.Competency and technical performance are central to this thinking.This article poses two questions:Has competency-based learning in computing and engineering transformed into the current digital age?If so,to what extent has computing and engineering education adopted competency-based learning in their curricula?The authors explore three reports affecting computing and engineering education to address these queries.They include the 2019 Chinese Computer Education for Sustainable Competence(Blue Book),the Computing Curricula 2020:Paradigms for Global Computing Education,and the 2023 Infinite Possibilities:Report on the Digital Development of Global Higher Education.The first emphasizes the importance and necessary elements of sustainable competency and agile education for com-puting and engineering in the digital era.The second defines competency as a triad of knowledge,skills,and human dispositions;it promotes the transformation from knowledge-based to competency-based learning.The third report provides a pathway for the modern digital development of global higher education in a digital and technological age.All three publications support directly or indirectly the transformation of competency into the current digital age.However,computing and engineering programs have yet to adopt competency-based learning in their curricula.Time can tell whether sustainable competency will permeate computing and engineering education globally.In the meantime,acade-micians and industry professionals should continue pursuing the cause to prepare students and graduates adequately as they become part of the digital era.展开更多
Several approaches for fast generation of digital holograms of a three-dimensional （3D） object have been discussed. Among them, the novel look-up table （N-LUT） method is analyzed to dramatically reduce the number ...Several approaches for fast generation of digital holograms of a three-dimensional （3D） object have been discussed. Among them, the novel look-up table （N-LUT） method is analyzed to dramatically reduce the number of pre-calculated fringe patterns required for computation of digital holograms of a 3D object by employing a new concept of principal fringe patterns, so that problems of computational complexity and huge memory size of the conventional ray-tracing and look-up table methods have been considerably alleviated. Meanwhile, as the 3D video images have a lot of temporally or spatially redundant data in their inter- and intra-frames, computation time of the 3D video holograms could be also reduced just by removing these redundant data. Thus, a couple of computational methods for generation of 3D video holograms by combined use of the N-LUT method and data compression algorithms are also presented and discussed. Some experimental results finally reveal that by using this approach a great reduction of computation time of 3D video holograms could be achieved.展开更多
Nanoelectromechanical(NEM)switches have the advantages of zero leakage current,abrupt switching characteristics,and harsh environmental capabilities.This makes them a promising component for digital computing circuits...Nanoelectromechanical(NEM)switches have the advantages of zero leakage current,abrupt switching characteristics,and harsh environmental capabilities.This makes them a promising component for digital computing circuits when high energy efficiency under extreme environmental conditions is important.However,to make NEM-based logic circuits commercially viable,NEM switches must be manufacturable in existing semiconductor foundry platforms to guarantee reliable switch fabrication and very large-scale integration densities,which remains a big challenge.Here,we demonstrate the use of a commercial silicon-on-insulator(SOI)foundry platform(iSiPP50G by IMEC,Belgium)to implement monolithically integrated silicon(Si)NEM switches.Using this SOI foundry platform featuring sub-200 nm lithography technology,we implemented two different types of NEM switches:(1)a volatile 3-terminal(3-T)NEM switch with a low actuation voltage of 5.6 V and(2)a bi-stable 7-terminal(7-T)NEM switch,featuring either volatile or non-volatile switching behavior,depending on the switch contact design.The experimental results presented here show how an established CMOS-compatible SOI foundry process can be utilized to realize highly integrated Si NEM switches,removing a significant barrier towards scalable manufacturing of high performance and high-density NEMbased programmable logic circuits and non-volatile memories.展开更多
文摘The control law synthesis, wind tunnel test and engineering properties ofdigital active flutter suppression system (AFSS) are presented.A method ofdiscretization of continuous domain is adopted in the control law design, and four kindsof control laws are demonstrated during the wind tunnel test with this method. Thewind tunnel test affirms the correctness of the theoretical computation and the test de-sign. The control law is implemented by use of microcomputer and industry controllerin this test. The engineering properties of the active flutter suppression system are pres-ented. The research on a dynamically scaled wing/ store configuration shows that theflutter speed increases by 20% or so and the performance of the system is basically satis-factory.
基金the National Natural Science Foundation of China,Nos.51935009 and 51821093National key research and development project of China,No.2022YFB3303303+2 种基金Zhejiang University president special fund financed by Zhejiang province,No.2021XZZX008Zhejiang provincial key research and development project of China,Nos.2023C01060,LZY22E060002 and LZ22E050008The Ng Teng Fong Charitable Foundation in the form of ZJU-SUTD IDEA Grant,No.188170-11102.
文摘This study presents a robustness optimization method for rapid prototyping(RP)of functional artifacts based on visualized computing digital twins(VCDT).A generalized multiobjective robustness optimization model for RP of scheme design prototype was first built,where thermal,structural,and multidisciplinary knowledge could be integrated for visualization.To implement visualized computing,the membership function of fuzzy decision-making was optimized using a genetic algorithm.Transient thermodynamic,structural statics,and flow field analyses were conducted,especially for glass fiber composite materials,which have the characteristics of high strength,corrosion resistance,temperature resistance,dimensional stability,and electrical insulation.An electrothermal experiment was performed by measuring the temperature and changes in temperature during RP.Infrared thermographs were obtained using thermal field measurements to determine the temperature distribution.A numerical analysis of a lightweight ribbed ergonomic artifact is presented to illustrate the VCDT.Moreover,manufacturability was verified based on a thermal-solid coupled finite element analysis.The physical experiment and practice proved that the proposed VCDT provided a robust design paradigm for a layered RP between the steady balance of electrothermal regulation and manufacturing efficacy under hybrid uncertainties.
文摘This paper mainly discusses the following problems: the important meaning and special function of simulation system; the definition, contents and relationship of system and system simulation science; the definition and technology of simulation system and its equipments; and systematic description and exploration in relation to the developing trend of system simulation science and simulation system technology.
文摘Objective： To evaluate the value of MSCT and DSA in diagnosing the postoperative recurrence of hepatocellular carcinoma by analyzing the results of these two image examinations. Methods： Seventytwo patients with postoperative recurrence of hepatocellular carcinoma were subjected to MSCT and DSA of their livers. The interval of two examinations was 2 to 14 days. Results： In 51 cases （70.83%）, the recurrent lesions were multiple small nodules （type Ⅰ）, 9 cases （12.36%） were single nodule （type Ⅱ）, and the remaining 12 cases （16.81%） were unequal nodules （type Ⅲ）. The results of two examinations were discrepancy in 10 patients. In 7 cases having positive results in DSA, the number of small nodules in 5 cases displayed by DSA was more than that by MSCT, and 2 cases had negative results in MSCT. In 3 patients having positive results in MSCT, number of small nodules in 2 cases displayed by MSCT was more than that by DSA and 1 case had negative results in DSA. Conclusion： MSCT and DSA had difference in displaying the postoperative recurrent lesions of hepatocellular carcinoma. The combined application of MSCT and DSA would be beneficial to improve the diagnosis of recurrent lesions.
基金the National Science Foundation of the United States for supporting the Collaborative Research:A Data-Driven Employer-Academia Partnership for Continual Computing Curricular Change(No.2111435)the Twenty Experts Forum Team on Computer Education for their contribution to the Blue Book,and the author team for their contribution to the Infinite Possibilities report.
文摘In today’s world,humanity is immersed in a digital era where technological advances driven by computers permeate everyone’s life.The situation raises the need for computing and engineering education to inform students of their responsibilities to society and their preparation to enter higher education and the workplace.Competency and technical performance are central to this thinking.This article poses two questions:Has competency-based learning in computing and engineering transformed into the current digital age?If so,to what extent has computing and engineering education adopted competency-based learning in their curricula?The authors explore three reports affecting computing and engineering education to address these queries.They include the 2019 Chinese Computer Education for Sustainable Competence(Blue Book),the Computing Curricula 2020:Paradigms for Global Computing Education,and the 2023 Infinite Possibilities:Report on the Digital Development of Global Higher Education.The first emphasizes the importance and necessary elements of sustainable competency and agile education for com-puting and engineering in the digital era.The second defines competency as a triad of knowledge,skills,and human dispositions;it promotes the transformation from knowledge-based to competency-based learning.The third report provides a pathway for the modern digital development of global higher education in a digital and technological age.All three publications support directly or indirectly the transformation of competency into the current digital age.However,computing and engineering programs have yet to adopt competency-based learning in their curricula.Time can tell whether sustainable competency will permeate computing and engineering education globally.In the meantime,acade-micians and industry professionals should continue pursuing the cause to prepare students and graduates adequately as they become part of the digital era.
基金supported by the MKE (Ministry of Knowledge Economy), Korea, under the ITRC (Informa-tion Technology Research Center)support program su-pervised by the NIPA (National IT Industry Promotion Agency) (NIPA-2009-C1090-0902-0018)
文摘Several approaches for fast generation of digital holograms of a three-dimensional （3D） object have been discussed. Among them, the novel look-up table （N-LUT） method is analyzed to dramatically reduce the number of pre-calculated fringe patterns required for computation of digital holograms of a 3D object by employing a new concept of principal fringe patterns, so that problems of computational complexity and huge memory size of the conventional ray-tracing and look-up table methods have been considerably alleviated. Meanwhile, as the 3D video images have a lot of temporally or spatially redundant data in their inter- and intra-frames, computation time of the 3D video holograms could be also reduced just by removing these redundant data. Thus, a couple of computational methods for generation of 3D video holograms by combined use of the N-LUT method and data compression algorithms are also presented and discussed. Some experimental results finally reveal that by using this approach a great reduction of computation time of 3D video holograms could be achieved.
基金the European Union’s Horizon 2020 research and innovation program under grant No.780283(MORPHIC),101070332(PHORMIC),871740(ZeroAMP)the i-EDGE project,funded by the European Union(No.101092018)+1 种基金the Swiss State Secretariat for Education,Research and Innovation(SERI No.10061130)UK Research and Innovation(UKRI No.10063023).
文摘Nanoelectromechanical(NEM)switches have the advantages of zero leakage current,abrupt switching characteristics,and harsh environmental capabilities.This makes them a promising component for digital computing circuits when high energy efficiency under extreme environmental conditions is important.However,to make NEM-based logic circuits commercially viable,NEM switches must be manufacturable in existing semiconductor foundry platforms to guarantee reliable switch fabrication and very large-scale integration densities,which remains a big challenge.Here,we demonstrate the use of a commercial silicon-on-insulator(SOI)foundry platform(iSiPP50G by IMEC,Belgium)to implement monolithically integrated silicon(Si)NEM switches.Using this SOI foundry platform featuring sub-200 nm lithography technology,we implemented two different types of NEM switches:(1)a volatile 3-terminal(3-T)NEM switch with a low actuation voltage of 5.6 V and(2)a bi-stable 7-terminal(7-T)NEM switch,featuring either volatile or non-volatile switching behavior,depending on the switch contact design.The experimental results presented here show how an established CMOS-compatible SOI foundry process can be utilized to realize highly integrated Si NEM switches,removing a significant barrier towards scalable manufacturing of high performance and high-density NEMbased programmable logic circuits and non-volatile memories.
