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Accurate simulation of unsteady turbulent flow is critical for improved design of greener aircraft that are quieter and more fuel-efficient. We demonstrate application of PyFR, a Python based computational fluid dynamics solver, to petascale simulation of such flow problems. Rationale behind algorithmic choices, which offer increased levels of accuracy and enable sustained computation at up to 58%...
A simple process is presented with which a bottom-gate-type oxide thin-film transistor (TFT) can be fabricated by using two photomasks. The active channel, the source–drain electrode, and the pixel electrode layers were simultaneously formed via a single photolithography using a gray-tone mask (GTM). In particular, the gray-tone profiles of the photoresist were carefully observed to ensure process...
Field robot represented by excavator can be applied for various working in manufacturing, construction, agriculture etc. Because of the flexibility of its multi-joint mechanism and the high power of hydraulic actuators. Since the excavator operates in the hazardous working circumstance, operators exposed in harmful environment. Therefore, automation system has been investigated to protect from the...
A low-power sensor node in WSN requires minimum consumption of energy. It is essential to establish key to reduce the effect when the sensor node is revealed. This paper propose the protocol of pairwise key establishment between sensor node. The proposed method increases the availability by clustering the network in three dimensional, which has smaller number of path and better energy efficiency than...
In this study, we first present the experimental results that regard the direct growth of CNTs on a conical-type tungsten (W) tip and their electron emission properties, in terms of the catalyst materials such as a nickel (Ni) and a cobalt (Co) as well as their composition ratios. Sharpening of W-tips was done by electrochemical etch and their diameters were controlled to range from 5 mum down to...
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