Browsing by Author "Zhou, D."
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Item An Improved Domain Decomposition Method for Drop Impact Reliability Analysis of 3D ICs(Institute of Electrical and Electronics Engineers Inc.) Zhou, H.; Zhu, H.; Cui, T.; Pan, D. Z.; Zhou, D.; Zeng, X.Drop test is usually adopted in the integrated circuit (IC) testing to estimate the shock resistance capability of IC packaging. Generally, it is very time consuming for the drop test simulation, therefore, the fast numerical approach is generally needed to reduce the computational cost. In this paper, we propose an efficient drop-test simulator for through-siliconvia (TSV) based three-dimensional integrated circuit (3D IC) to simulate its mechanical behaviors under drop impact. The proposed simulator is based on the idea of domain decomposition (DD) to improve the condition number of the coefficient matrix of the solver. We further develop two efficient numerical techniques in the simulator to improve its efficiency. First, a second order formulation is proposed for the initial solution selection in preconditioned conjugate gradient (PCG) solver, which can efficiently reduce the number of PCG iterations at each time point during simulation. And second, an equivalent structureembedded model is proposed and applied in the first Schwarz iteration to efficiently reduce the number of Schwarz iterations in DD method. Numerical experiments show that the proposed drop-test simulator can achieve 7.03× speedup in comparison with the conventional FEM-based solver. It is demonstrated in the paper in the paper through several examples with multi chip layers, of which each chip layer consists of an 8 × 8 TSV array, that the proposed simulator can be widely applied to reliability analysis of 3D ICs under drop impact.Item Polystyrene-Coated Interdigitated Microelectrode Array to Detect Free Chlorine Towards IoT Applications(Japan Society for Analytical Chemistry, 2018-12-28) Liu, Y.; Liang, Yuchen; Xue, L.; Liu, R.; Tao, J.; Zhou, D.; Zeng, X.; Hu, Wenchuang (Walter); Liang, Yuchen; Hu, Wenchuang (Walter)We apply interdigitated microelectrode array (IDA) sensors for water quality monitoring. IDA sensors with an ion-sensitive coating show higher sensitivity of about 600 mV with the hypochlorite ion concentration increasing from 0 to 10 ppm more than the traditional sensing method. The response mechanism and selectivity have been studied. Several material components that affect the sensing process were explored. Coupling agents and plasticizer were introduced into the coating material to improve the coating material quality and its adhesion to the electrodes. The stability/repeatability and linearity have been significantly improved. ©2019, The Japan Society for Analytical Chemistry.