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This paper presents two novel designs of SIW H-plane horn antenna which are achieved by adding different double square loops as transition structure. The double square loop and its improvement rotated double square loop are adopted to improve the mismatch between the horn and free space. By optimizing the dimensions of the double square loop structure and rotation angle, the bandwidth performance...
Here we show a new approach to create a sharp tunable microwave bandstop filter. Using a low Brillouin loss of ∼3 dB, we achieved 20-dB extinction filter over a tunable bandwidth of up to 1 GHz with a central frequency tuning range of 16 GHz.
The popularity of GPUs in general purpose computation has prompted efforts to scale up MapReduce systems with GPUs, but lack of efficient I/O handling results in underutilization of shared system resources in existing systems. This paper presents SPMario, a scale-up GPU MapReduce framework to speed up job execution and boost utilization of system resources with the new I/O Oriented Scheduling. The...
Today's data center jobs typically follow a coflow model. Each coflow consists of multiple concurrent data flows, while each job is comprised of multiple coflows. Only completing all flows in all coflows is meaningful to a job. To guarantee the job completion time, job deadlines and coflow dependencies must be jointly considered. However, existing solutions mainly consider the coflow scheduling, which...
In the high-speed real-time image processing system, an arbitration module is used to solve the problem of access conflicts when single port memory is shared within functional modules of FPGA. In this paper, the shared memory characteristics of each port module are briefly analyzed, and then the implementation mechanism and the specific design steps of arbiter logic are given. Finally, the logic is...
We demonstrate a scheme to broaden the bandwidth of the Kerr frequency comb generated through mode interaction in a silicon nitride microresonator with normal dispersion. The broadened comb has a bandwidth of over 5 THz and can be compressed to the bandwidth limited time profile via dispersive fiber propagation.
The number of available pins in ball grid array (BGA) of modern system-on-chips (SOCs) has been discussed as one of the major bottlenecks to the performance of the processors, for example many-core enabled portable devices, where the package size and PCB floorplan are tightly constrained. A typical SOC package allocates more than half of the pins for power delivery, resulting in the number of IO pins...
A low-power 40 Gb/s optical receiver is reported. The receiver consists of a broadband photodiode followed by a low-noise transimpedance amplifier front-end, a 3-stage Cherry-Hooper limiting amplifier, an output driver, and an offset cancellation network. The photodiode is fabricated in a 0.18 µm Ge-on-SOI process and the electronic chip is fabricated in a 0.13 µm SiGe BiCMOS process. The receiver...
Optical interconnects, which support the transport of large bandwidths over warehouse-scale distance, can help to further scale data-movement capabilities in high performance computing (HPC) platforms. However, due to the circuit switching nature of optical systems and additional peculiarities, such as sensitivity to temperature and the need for wavelength channel locking, optical links generally...
The design and analysis of a wideband coupled-cavity Traveling-Wave Tube (TWT) operating at 35 GHz is presented. The interaction circuit employs a novel coupled-cavity circuit, which is based on the combination of a three-slot ladder coupled-cavity slow-wave structure and round electron beam. In this paper, the high frequency properties such as dispersion characteristics, beam-wave interaction impedance...
This paper presents the design, implementation and evaluation of SprintNet, a novel network architecture for data centers. SprintNet achieves high performance in network capacity, fault tolerance, and network latency. SprintNet is also a scalable, yet low-diameter network architecture where the maximum shortest distance between any pair of servers can be limited by no more than four and is independent...
The service quality of a station in IEEE 802.11 wLAN (wireless Local Area Networks) is strongly influenced by which access point it associates with. Therefore, a key challenge is how to select an appropriate access point from multiple available ones. Conventional association protocols have been proved to be not effective. In this paper a strategy for differentiated access service selection based on...
The main purpose of content distribution network is to redirect Internet users to the servers nearest to them, known as edge cache server. Thus, their desired contents can be obtained more rapidly and steadily. With the optimized QoS (Quality of Service) of the Internet, user experience can be improved to a certain extent. Generally speaking, when it comes to content distribution network, the CDN...
We present a 30 GHz silicon photonic platform that includes low-loss passive components as well as high-speed modulators and photodetectors. The platform is available to the community as part of the OpSIS-IME MPW service.
We demonstrate a scheme to scale the bandwidth of a frequency comb generated by phase modulation of CW lasers using four-wave mixing in a silicon nano-waveguides, resulting in >100 comb lines spaced by 10-GHz within 5-dB bandwidth.
In this paper, radiation performance of a ground radiation antenna using magnetic coupling structure is compared with a conventional planar inverted-F antenna (PIFA) in terms of the impedance bandwidth and radiation efficiency. The size of the proposed ground radiation antenna is 5 × 10 mm2, reduced up to approximately 50% while the impedance bandwidth is obtained as 560 MHz (2174∼2734MHz), improved...
We present an evaluation of the fault-tolerance characteristics of several important data center network topologies, including Fat-tree, DCell, HyperBCube and BCube using several metrics, including average path length, aggregated bottleneck throughput and connection failure ratio. These enable us to present an objective comparison of the network topologies under faulty conditions.
We propose a Strip-oriented Asynchronous Prefetching (SoAP) for the parallel disk systems. This technique splits a prefetching request into multiple independent prefetching sub-requests, each of which contains a full data strip to exploit the maximum physical sequentiality of involved disks. In addition, SoAP associates each prefetching sub-request with a relative large time window, allowing every...
In this paper, the recent research progress on the V-band traveling-wave tube in our laboratory is presented. Several robust full-metal slow-wave structures, including two circular beam structures and two sheet-beam structures, are investigated and employed to design the V-band traveling-wave tube. The corresponding operating characteristics are predicted by using the particle-in-cell method.
Study on U-shaped microstrip meander-line slow-wave structure for a low voltage, wide bandwidth millimeter traveling-wave tube is presented. The electromagnetic characteristics and the sheet beam-wave interaction of this structure are carried out. The simulation results predicts that this millimeter-wave power amplifier is capable of delivering hundreds of watts output power in the frequency range...
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