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The massive adoption of cloud-based services in data center lead to an exponential increasing in both the amount traffic and servers, which brings a great challenge to data center network (DCN). In this paper, MOSA: a modular all-optical switching architecture based on arrayed waveguide gratings (AWG) is proposed to address the issue. The modular design makes MOSA can expand up to millions of servers...
In this paper, the application of dielectric resonator antenna (DRA) array in 5G communication system is studied. Firstly, an 8-way Wilkinson power divider with fold structure is designed, whose port phase and transmission efficiency are applicable for a feed network. Secondly, a kind of semi cylindrical DRA unit operated on 28 GHz is presented. It is fed by aperture coupled microstrip line. The 8-unit...
This paper presents design methods of tri-beam antenna systems. To produce a forward beam along antenna normal axis, 3×3 Butler matrix network with three directional couplers and four −90 degree phase shifters is proposed. When different input ports are excited, the proposed structure can produce three output signals with equal amplitude and the phase differences of −120 degree, 120 degree and 0 degree,...
Based on substrate integrated waveguide (SIW) technology and the standard single layer printed circuit board (PCB) process, a slot antenna array with three beams at X-band is designed and realized. A slot antenna unit based on SIW technology is analyzed and designed at 10GHz. S parameters and radiation patterns are given. Finally, a 3×1 antenna array is connected with the Butler matrix as a beam-forming...
Online Health Communities (OHCs) have become a major source of social support for people with health problems. Using a case study of an OHC among breast cancer survivors, we revealed the types of social support embedded in each post using text-mining techniques. Then we aggregated users' activities related to different types of social support and identified different roles that users play in an OHC...
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