For cell culture scaffold innovation,3DPVS,namely 3D printed vibratory scaffold,was indicated as a future novel product,and it currently stands at conceptual development stage.One essential part for 3DPVS design is in...For cell culture scaffold innovation,3DPVS,namely 3D printed vibratory scaffold,was indicated as a future novel product,and it currently stands at conceptual development stage.One essential part for 3DPVS design is innovation,and TRIZ(algorithm of inventive problem solving)was studied as promising method for generating novel conceptual solutions.This study targets designing and solving 3DPVS problems using TRIZ in the new biodimension.We aim to utilize TRIZ to conduct a multi-layer problem-solving process,which is to address design concerns of 3DPVS,especially at super-system to system level.In this connection,TRIZ is used to address basic constraints and contradictions inside regarding trinity of 3D printing,3D scaffold and bio-based vibratory functionality.In the study,five basic conceptual solutions for potential 3DPVS,namely magnetic,electric,mechanical,light and thermal based,have been generated.A brief evaluation has also been conducted,where magnetic-based 3DPVS shows the relatively highest applicability as potential 3DPVS.Compared with traditional experimental-oriented processes for biodesign,the approach of utilizing TRIZ can be inspiring and reinvigorating,which prepares a ground for future 3DPVS design to address detailed sub-system concerns.This study might,to some extent,fill a gap in scaffold design and TRIZ literature and hopefully provide a comprehensive perspective of a timely topic.展开更多
In this paper,we propose genetic programming(GP) using dynamic population variation(DPV) with four innovations for reducing computational efforts.A new stagnation phase definition and characteristic measure are define...In this paper,we propose genetic programming(GP) using dynamic population variation(DPV) with four innovations for reducing computational efforts.A new stagnation phase definition and characteristic measure are defined for our DPV.The exponential pivot function is proposed to our DPV method in conjunction with the new stagnation phase definition.An appropriate population variation formula is suggested to accelerate convergence.The efficacy of these innovations in our DPV is examined using six benchmark problems.Comparison among the difierent characteristic measures has been conducted for regression problems and the new proposed measure outperformed other measures.It is proved that our DPV has the capacity to provide solutions at a lower computational effort compared with previously proposed DPV methods and standard genetic programming in most cases.Meanwhile,our DPV approach introduced in GP could also rapidly find an excellent solution as well as standard GP in system modeling problems.展开更多
文摘【目的】针对大规模新能源接入造成主网惯量降低,进而使配电网支撑能力不足并影响配电网电压-频率耦合特性的问题,文章深入研究了分布式光伏(distributed photovoltaic,DPV)接入配电网后的暂态电压-频率耦合机理,旨在为高渗透率新能源接入的配电网稳定运行优化与控制策略制定提供理论依据。【方法】基于IEEE 33节点系统,分析DPV接入配电网前后暂态电压和频率的响应特性,发现新能源主导的暂态发展过程中电压和频率的动态耦合特性凸显,且低惯量下频率问题更突出。通过深入研究暂态电压跌落与频率波动的内在原因,明确DPV与并网系统的交互行为是电压-频率耦合的关键因素。进一步从功率平衡角度,量化主、配网有功变化间的动态联系,揭示暂态过程中电压-频率耦合机理。【结果】仿真验证表明,DPV的暂态响应特性主导了暂态过程中电压的变化,并进一步扰动频率。在低惯量系统中,DPV的低压穿越(low voltage ride-through,LVRT)过程不仅决定了电压的跌落与恢复形态,其无功支撑行为更会间接扰动系统频率。暂态过程中,电压变化引起配电网侧有功供需关系改变,破坏了系统有功平衡,此不平衡量经由主网-配电网功率交互,最终体现为系统频率波动,明确了电压变化对频率产生扰动的主导路径。【结论】文章量化描述了电压与频率的耦合关系,揭示了耦合机理的本质是“电压波动→有功失衡→频率响应”的动态传递过程。DPV无功-有功耦合特性加剧了电压-频率耦合的复杂性。该机理的明晰为后续设计抑制频率波动的电压-频率协同控制策略提供了理论基础。
文摘For cell culture scaffold innovation,3DPVS,namely 3D printed vibratory scaffold,was indicated as a future novel product,and it currently stands at conceptual development stage.One essential part for 3DPVS design is innovation,and TRIZ(algorithm of inventive problem solving)was studied as promising method for generating novel conceptual solutions.This study targets designing and solving 3DPVS problems using TRIZ in the new biodimension.We aim to utilize TRIZ to conduct a multi-layer problem-solving process,which is to address design concerns of 3DPVS,especially at super-system to system level.In this connection,TRIZ is used to address basic constraints and contradictions inside regarding trinity of 3D printing,3D scaffold and bio-based vibratory functionality.In the study,five basic conceptual solutions for potential 3DPVS,namely magnetic,electric,mechanical,light and thermal based,have been generated.A brief evaluation has also been conducted,where magnetic-based 3DPVS shows the relatively highest applicability as potential 3DPVS.Compared with traditional experimental-oriented processes for biodesign,the approach of utilizing TRIZ can be inspiring and reinvigorating,which prepares a ground for future 3DPVS design to address detailed sub-system concerns.This study might,to some extent,fill a gap in scaffold design and TRIZ literature and hopefully provide a comprehensive perspective of a timely topic.
基金Ministry of Major Science & Technology of Shanghai(No.10DZ1200204)
文摘In this paper,we propose genetic programming(GP) using dynamic population variation(DPV) with four innovations for reducing computational efforts.A new stagnation phase definition and characteristic measure are defined for our DPV.The exponential pivot function is proposed to our DPV method in conjunction with the new stagnation phase definition.An appropriate population variation formula is suggested to accelerate convergence.The efficacy of these innovations in our DPV is examined using six benchmark problems.Comparison among the difierent characteristic measures has been conducted for regression problems and the new proposed measure outperformed other measures.It is proved that our DPV has the capacity to provide solutions at a lower computational effort compared with previously proposed DPV methods and standard genetic programming in most cases.Meanwhile,our DPV approach introduced in GP could also rapidly find an excellent solution as well as standard GP in system modeling problems.
