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LoRa, an emerging wireless technology, is examined for long range communication performance in a large area. Although LoRa shows good performance for long-distance transmission in the countryside, its radio signals can be attenuated and interfered with by buildings, trees and other signal sources. In urban areas, our observation shows that LoRa requires a dense deployment of LoRa gateways to ensure...
This study presents a polymer-coated hollow-core-fiber-Fabry-Perot interferometer to measure liquid level. Wavelength shift of interference fringes of the proposed device exhibits linear response corresponding to the liquid level with a high sensitivity of −0.446nm/cm.
Utility pattern mining has received extensive attentions in recent years due to the wide and novel applications in various fields like e-commerce, Web mining, finance, biomedicine, etc. However, there exists not yet a toolbox for utility pattern mining so far. In this work, we address this issue by proposing a first-of-its-kind toolbox named UP-Miner (Utility Pattern Miner) that provides various functions...
In this study, the effects of various annealing temperatures on gadolinium oxide (Gd 2 O 3 ) fabricated with Al 2 O 3 and Ti-doped gadolinium oxide (GdTi x O y ) fabricated with SiO 2 blocking were examined for use in metal/oxide/high-k material/oxide/silicon (MOHOS) memory devices. To investigate the effects of annealing, X-ray diffraction (XRD),...
It is reported that field emission can effectively enhanced for aligned carbon nanotubes (CNTs) as field emitters when the ratio of distance between neighboring nano-tubes to the height of each individual CNT is about 2. In this paper, we proposed pillar array design of CNTs to fulfill the optimum R/H ratio (the ratio between inter-pillar distance R and pillar height H) with high density of aligned...
In this paper, Fe/Ti and Co/Ti bi-layered catalysts were used to study the growth and field emission characteristics of carbon nanotubes(CNTs). Nanoparticles of Co/Ti bi-layered catalyst are uniform in size and smaller than those from Fe/Ti bi-layered catalyst. Well graphite structure of CNTs grown by Fe/Ti and Co/Ti bi-layered catalysts were confirmed by TEM and Raman analyses. Besides, CNTs grown...
Effect of carbon nanotube pillar arrays' edge effect on field emission characteristics is first studied. The ratio of field emission current density at 5.733V/μm is about 55: 6.5: 1 which is nearly proportional to the edge ratio (50:5:1) for small, middle, and large sizes of CNTs' arrays. Besides, ultra low turn-on field (~1.4 V/μm), well emission image uniformity and stability of about ±6.52 % at...
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