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- 저자 : Xiaoqiang Wu (검색결과 5 건)
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Thermal management analysis of serial-connection three-chamber piezoelectric pump
Lipeng He,Xiaoqiang Wu,Zheng Zhang,Jingran Wang,Dianbin Hu,Yamei Liu,Guangming Cheng 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
The design of a micropump with high performance and excellent reliability on thermal management still remains a challenge for electronic cooling. The performance of a piezoelectric pump with 3 chambers connected in series on thermal management was investigated for electronic cooling in this study. Two S-shaped channel heat sinks and the piezoelectric pump with 3 chambers connected in series were combined to form a loop cooling system. With water as the pumping medium, the tested pump has a flow rate most up to 690.6 ml/min at an input voltage of 220 V and an input frequency of 110 Hz. Suitability of the system has been demonstrated through simulation analysis and experimental verification for temperature control. A temperature reduction of 3 °C of CPU could be achieved at 250 mL/min flow rate generated by the piezoelectric pump with 3 chambers connected in series.
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Xiong Song,Xiaoqiang Zhang,Shunchuan Wu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.11
It is difficult to characterize the whole process of seepage movement by traditional numerical methods, which leads to the unclear mechanism of stress-strain change in soil. Therefore, the meshless method smooth particle hydrodynamics method is proposed to study the seepage law and deformation characteristics of soil. Combined with the strain softening model, a nonlinear cohesive force change model of porous media is proposed to accurately describe the evolution characteristics of soil seepage failure. Secondly, the damping coefficient and stress normalization method are used to better eliminate the defects of numerical stress noise generated by soil deformation after boundary interpolation, and improve the accuracy of SPH method in studying the internal stress of soil deformation. It is concluded that the influence of the viscosity coefficient on the unsteady head is significantly higher than that of the constant head. At the same time, the evolution characteristics of soil seepage instability under linear cohesion change are compared and analyzed. It can be seen that the proposed nonlinear cohesion change model is more in line with the actual failure mode of soil seepage. The research results can provide a new method and idea for the study of slope seepage motion range and stability analysis.
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Li Juanfei,Wu Lei,Ma Mingyu,Song Ruifeng,Dong Chunhui,Wei Junfang,Li Jinsheng,Wang Xiaoqiang,Li Mingya 한국물리학회 2023 Current Applied Physics Vol.46 No.-
La0.7Sr0.3MnO3 (LSMO)/LaNiO3 (LNO) thin films were deposited successively on Si single crystal by the sol-gel method. The bipolar resistive switching (RS) behavior was studied in Al/LSMO/LNO devices. Obvious current hysteresis was observed, the set (reset) voltage and resistance ratio were modulated by the annealing temperature of LSMO thin films. At the annealing temperature of 750 ◦C, good endurance and retention performance were obtained in the memory device. According to the fitting results of I–V curves, based on Schottky emission model, the conduction mechanisms of Al/LSMO/LNO devices were discussed. Our results may give a valuable insight on developing perovskite-type rare earth manganese oxide.
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Optimal Cooperation and Transmission in Cooperative Spectrum Sensing for Cognitive Radio
( Xian Zhang ),( Qihui Wu ),( Xiaoqiang Li ),( Zi Yun ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.2
In this paper, we study the problem of designing the power and number of cooperative node (CN) in the cooperation phase to maximize the average throughput for secondary user (SU), under the constraint of the total cooperation and transmission power. We first investigate the scheme of cooperative spectrum sensing without a separated control channel. Then, we prove that there indeed exist an optimal CN power when the number of CNs is fixed and an optimal CN number when CN power is fixed. The case without the constraints of the power and number of CN is also studied. Finally, numerical results demonstrate the characteristics and existences of optimal CN power and number. Meanwhile, Monte Carlo simulation results match to the theoretical results well.
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Securing the AES Cryptographic Circuit Against both Power and Fault Attacks
Jinbao Zhang,Ning Wu,Fang Zhou,Fen Ge,Xiaoqiang Zhang 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.5
Aiming to protect cryptographic circuits against physical attacks, researchers have proposed a variety of mature and effective countermeasures. However, most of these defensive technologies are used for specific and single attack, thus it is hard to thwart combined attack, such as combined power and fault attacks. In this paper, we propose a dual complementary infection countermeasure for Advanced Encryption Standard (AES) cryptographic circuit to defend against both power and fault attacks. According to the target AES circuit, we first design and construct a dual complementary AES circuit to defend against power attacks, which can balance the power consumption when processing different data. Besides, to defend against fault attacks, in the dual complementary AES circuit, we design an improved random infection mechanism to diffuse the effect of injected faults. Experiment results show that the proposed countermeasure can thwart both power and fault attacks effectively. Compared with those AES circuits which can only defend against single attack, our designed circuit increases greatly the security under extra 83.1% area overhead and 2.1% impacts on the maximum working frequency.
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