A new planar MISHEMT structure is proposed with the drain surrounded (D-S) by the gate channel. The gate channel serves as the stop-ring of the drain voltage, eliminating the damages from the high voltage on the mesa edge and isolation area. As a result, the leakage of the D-S MISHEMT is found to be reduced by almost 3 orders comparing with the source surrounded (S-S) MISHEMT. A saturated output current density of 740 mA/mm and an ON-resistance of 13.09 Ω-mm are obtained for device with LG/LGS/LGD/WC = 1.5/5/20/250 μm. Meanwhile, the degradation of dynamic ON-resistance and off-state breakdown performance are investigated in both D-S and S-S MISHEMT, which indicates excellent reliability of the D-S MISHEMT.
Zhang W, Zhang J, Shen M, Xiao N, Luo G. Mapping Large-Scale DNNs on Asymmetric FPGAs, in Proceedings of the 2018 ACM/SIGDA International Symposium on Field-Programmable Gate Arrays - FPGA '18. New York, New York, USA: ACM Press; 2018:291–291. 访问链接
The coating surface temperature of the stealth aircraft increases due to the motion and heating effect, which causes the inhomogeneous temperature distributions between the coating and the metal substrate. In this paper, the millimeter-wave radiation characteristics of the stealth aircraft under motion state are discussed. Firstly, one dimensional heat conduction equation of the stealth aircraft under motion state is established, and we obtain the temperature distributions along the vertical directions. Then, according to the layered coating and th e non-uniformity of diel ectric property caused by temperature variation, the total brightness temperature is calculated by using radiation transfer theory. The calculated results indicate that the temperature distributions of the motional aircraft coating varies with the t ime, and th e millimeter-wave radiation characteristics also have time-varying.
Peng P, Zou L, Özsu TM, Zhao D. Multi-query Optimization in Federated RDF Systems, in Database Systems for Advanced Applications - 23rd International Conference, DASFAA 2018, Gold Coast, QLD, Australia, May 21-24, 2018, Proceedings, Part I.; 2018:745–765. link