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| 1 | Multidisciplinary design optimization approach and its application to aerospace engineering显示文摘The multidisciplinary design optimization(MDO)approach is very crucial for the conceptual design of the aircraft,and this is due to the complex interaction between different disciplines, especially for the hypersonic vehicle. In the hypersonic vehicle, the airframe and the engine are highly integrated. In the current survey, the research progress in the MDO approach has been reviewed comprehensively from four primary techniques, namely the design of experiments, the surrogate modeling, the optimization method and the MDO framework, and its application to the aerospace engineering has been summarized from its category as well. The concurrent subspace optimization approach is the most popular method in the aerospace engineering for its easy implementation, and following is the collaborative optimization approach. The multi-level optimization approach has attracted a growing attention due to its high efficiency. In conclusion, some promising research recommendations have been put forward, namely the combination of the low- and high-fidelity optimization approaches, the consideration of the uncertainty analysis and the MDO approach coupled with the data mining techniques. | Zhenguo Wang Wei Huang Li Yan | 2014 | Chinese Science Bulletin2014，59，36： | 7 |
| 2 | An overview of the switching parameter variation of RRAM显示文摘Resistive random access memory(RRAM) has been considered as one of the most promising candidates for next-generation nonvolatile memory, due to its advantages of simple device structure, excellent scalability, fast operation speed and low power consumption. Deeply understanding the physical mechanism and effectively controlling the statistical variation of switching parameters are the basis of fostering RRAM into commercial application. In this paper, based on the deep understanding on the mechanism of the formation and rupture of conductive filament, we summarize the methods of analyzing and modeling the statistics of switching parameters such as SET/RESET voltage, current, speed or time. Then, we analyze the distributions of switching parameters and the influencing factors. Additionally, we also sum up the analytical model of resistive switching statistics composed of the cell-based percolation model and SET/RESET switching dynamics. The results of the model can successfully explain the experimental distributions of switching parameters of the Ni O- and Hf O2-based RRAM devices. The model also provides theoretical guide on how to improve the uniformity and reliability such as disturb immunity. Finally, some experimental approaches to improve the uniformity of switching parameters are discussed. | Meiyun Zhang Shibing Long Guoming Wang Yang Li Xiaoxin Xu Hongtao Liu Ruoyu Liu Ming Wang Congfei Li Pengxiao Sun Haitao Sun Qi Liu Hangbing L Ming Liu | 2014 | Chinese Science Bulletin2014，59，36： | 1 |
| 3 | Operation methods of resistive random access memory显示文摘In this paper, different electrical measurement and operation methods of resistive random access memory(RRAM) have been summarized, including voltage sweeping mode(VSM), current sweeping mode(CSM), constant current stress(CCS), constant voltage stress(CVS), rectangular pulse mode(RPM), and triangle pulse mode(TPM). Meanwhile, the effects of these measurement methods on the forming, set, reset and read operation as well as endurance performance have been compared. Finally, their respective controllability of various resistive switching parameters have been summarized and analyzed. | WANG Guo Ming LONG Shi Bing ZHANG Mei Yun LI Yang XU Xiao Xin LIU Hong Tao WANG Ming SUN Peng Xiao SUN Hai Tao LIU Qi Lü Hang Bing YANG Bao He LIU Ming | 2014 | Science China(Technological Sciences)2014，57，12： | 1 |
| 4 | Microgravity Material Research in China:2016显示文摘Firstly,recent research works of high undercooling and rapid solidification of metallic alloys under ground simulation conditions in Northwestern Polytechnical University are reviewed.Secondly,under normal gravity and microgravity of binary to quinary Nickel-base single crystal alloys with different contents of W,Ta,Al and Ti elements are comparatively investigated by Institute of Metal Research using drop tube.Thirdly,solidification and crystal growth of SJ10-Recoverable Scientific Experiment Satellite by Institute of Semiconductors is introduced. | XIE Wenjun LUO Xinghong ZHANG Xingwang YU Yude | 2016 | 空间科学学报2016，36，5： | 1 |
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