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A deep-learning inference accelerator is synthesized from a C-language software program parallelized with Pthreads. The software implementation uses the well-known producer/consumer model with parallel threads interconnected by FIFO queues. The LegUp high-level synthesis (HLS) [1] tool synthesizes threads into parallel FPGA hardware, translating software parallelism into spatial parallelism. A complete...
Coarse-grained reconfigurable arrays (CGRAs) are a style of programmable logic device situated between FPGAs and custom ASICs on the spectrum of programmability, performance, power and cost. CGRAs have been proposed by both academia and industry; however, prior works have been mainly self-contained without broad architectural exploration and comparisons with competing CGRAs. We present CGRA-ME - a...
We consider implementing FPGAs using a standard cell design methodology, and present a framework for the automated generation of synthesizable FPGA fabrics. The open-source Verilog-to-Routing (VTR) FPGA architecture evaluation framework [1] is extended to generate synthesizable Verilog for its in-memory FPGA architectural device model. The Verilog can be synthesized into standard cells, placed and...
The friction discontinuity at low-speed of reaction wheel causes an undesirable impulsive jerk disturbance in spacecraft control system. In order to compensate the disturbance of static friction discontinuity, this paper proposes a simple and effective friction compensation method applying a command shaping technique to the wheel command torque. A simulation of the three-axis spacecraft attitude control...
Although the Manchester code has many merits among various codes, it has been so far applied in the binary code. The contributions of this paper are that new types of the Manchester code for PAM-n and a clock and data recovery (CDR) method are proposed. The transceiver is easily implemented because it does not need a scrambler circuit and a baseline wandering compensator. The operation of the CDR...
Fixed and wireless convergence service environment is generating a huge amount of traffic, fostering the evolution of the optical network capacity and reach. The greatest portion in the traffic increase is occupied by the video traffic. In order to deal with the traffic increase and improve the network profitability, optical network is evolving towards the smart network. This paper explains about...
Femtosecond laser fabrication of optical waveguides in bulk silica glass is extended to integrated optical waveplates. Polarization retardation was controlled by laser exposure, providing for trimming of waveguide birefringence between 10−5 and 10−4.
KOMPSAT-5 has a benefit of continuously conducting its mission in all-weather by loading a SAR (Synthetic Aperture Radar) payload. During IOT (In-Orbit Test) periods, calibration and validation campaign is performed to determine that bus and payload are working as expected. Differently the conventional corner reflector, active transponder has a capability to adjust internal gain to meet the pre-defined...
Radiometric Accuracy of SAR Image is one of the most important requirements for KOMPSAT (Korea Multi-Purpose SATellite)-5 and it is the main objective of calibration and validation procedure. The radiometric calibration can be divided into relative and absolute radiometric calibration. Point targets whose RCS (Radar Cross Section) can be evaluated with the close-form equation are required to perform...
We report the recent field trial of a DWDM-type 20-channel EPON reach extender. Combining O-E-O regeneration with colorless DWDM technology employing tunable lasers based on polymer waveguides, we were able to multiplex 20 EPON bidirectional optical signals into a single fiber and transport them over 50km without affecting any existing EPON equipments. We successfully installed its prototype in a...
Colorless gigabit wavelength-division-multiplexing (WDM)/time-division-multiplexing (TDM) hybrid passive optical network (PON) using a remote protocol terminator is proposed and experimentally demonstrated. The system consists of reflective semiconductor optical amplifier-based WDM-PON and a legacy TDM-PON, combined with a simple and efficient remote node structure in order to provide high-speed fiber-to-the-home...
We describe the first RSOA-based WDM/TDM hybrid PON system to enter commercial service. The system, consisting of a 16 times 1.25 Gb/s colorless Gigabit WDM-PON and a legacy TDM-PON with optical-electrical-optical converters, provides the triple-play service using fiber-to-the-home and fiber-to-the-node in a new residential area in Korea.
In this paper, we will present the results of FTTH deployment status in Korea. In Korea, Korea Telecom has deployed FTTH with Ethernet-PON and WDM-PON. Since January 2008, 1.2 million numbers of FTTH infrastructures have deployed and among them, 0.7 million numbers of subscribers is now using the real - FTTH service. Furthermore, we made the world's first deployment in GW-PON (Giga WDM-PON) system...
We define and demonstrate a supervisory system for WDM-PON applications. Utilizing most up-to-date technologies (Simplex coding, tunable source, and optical switches), successful interrogation of the whole network (16 port times 32 node = 512 user) was achieved without any transmission penalty.
WDM-PON is viewed as a suitable next generation access network technology due to its capability of delivering high bandwidth and OPEX saving features. In this paper, several research activities of DWDM-PON are introduced and analyzed. Technical issues and propects are also presented.
In the CNT paste for field emission, PbO frit had a fatal influence on CNTs during firing, resulting in the accelerated decomposition of CNTs. In the thermogravimetric analysis on the mixtures of CNTs and other ingredients, it was evident that CNTs began to burn out at 350degC by reacting with PbO. This problem was overcome by replacing the PbO frit by the lead-free frit such that most of CNTs could...
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