Attackers of modern computer architecture found that cache access latency difference between cache hit and cache miss is a point where secure data are overlooked. To prevent such data leakage, cache partitioning technique is utilized for defenders via cache hit isolation. Although this approach is effective in increasing resistance against cache timing attack, it is not suitable for emerging memory system, which is based on non-volatile memories, because it overlooks the weaknesses of the write operations. This paper proposes a secure-aware partitioning guide architecture to improve performance and write endurance by removing the necessity of cache flushing. During changing cache partitioning status, the write counts are considered for the new status and no cache lines are evicted in the proposal. As a result, the lifetime is extended by 1.77 times and the penalty of cache flushing is saved by 7.8%.
Arbitrarily-shaped dispersive media can be treated with the dispersive contour-path (DCP) FDTD method. We extend the DCP-FDTD method for the analysis of a periodic structure to the case at oblique incidence. A trapezoidal recursive convolution technique is used to incorporate dispersive media into the DCP-FDTD method. The transmission characteristics of a metallic cylinder array are evaluated and discussed. It is found that the present method gives almost the same solution as the conventional staircase FDTD method, even with a sampling width five times as large as the conventional counterpart.
The thermal aware floor planning for VLSIs and thermal placement optimization of electronic components on printed circuit boards (PCBs) using genetic algorithms (GAs) are well studied. However, there are no technical paper on optimization of component placement considering the heat of smartglasses. In this paper, we propose a method for optimizing the placement of electronic components equipped on smartglasses using the elitist non-dominated sorting genetic algorithm (NSGA-II) and a thermal resistance circuit. Electronic components that have various dimensions and power consumptions are relocated to minimize the maximum temperature of parts around ears and areas often held by hands simultaneously. The experimental results show that the proposed method effectively reduced the maximum temperatures.
This paper proposes a near-field focused (NFF) planar transmitarray with low profile operating in the C-band. A frequency selective surface (FSS) unit cell with a profile of only 0.15λ is designed by combining generalised scattering theory with full-wave simulations. To achieve better focusing, the transmission phase of the central unit cell of the transmitarray is adjusted to 90°. The focusing relative bandwidth is 13.7% at a centre frequency of 5.8GHz, which enables a good focusing effect to be achieved. Meanwhile, this paper evaluates the microwave power received at the receiver when the proposed transmitarray used in MPT system. The measured results show that loading the proposed transmitarray can improve the received power up to 510%. Futhermore, in the range of 220-660mm from the transmitarray, the received power can be increased to more than 300%.