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Abdessattar Bouzid,Jun-Bum Park,Se Min Kim,Sean Kwak,Sung Moon 한국물리학회 2011 Current Applied Physics Vol.11 No.3
To better understand how the active hold-off technique in single-photon detectors (SPDs) based on InGaAs/InP avalanche photodiodes (APDs) enhances the performance of a quantum key distribution (QKD) system based on the BB84 protocol, we have evaluated the dependence of the raw key creation rate (R_raw) as well as the quantum bit error rate (QBER) on the number of active hold-off gates. The results of our analysis reveal that at 10 MHz repetition rate of the gate, by holding-off 200 gate pulses immediately following an avalanche event, the afterpulse contribution to the QBER drops down to 2.35%without noticeable decrease in the R_raw.
Modeling and experimental comparative analysis on the performance of small-scale wind turbines
Ehab Basta,Mehdi Ghommem,Lotfi Romdhane,Abdessattar Abdelkefi 한국풍공학회 2020 Wind and Structures, An International Journal (WAS Vol.30 No.3
This paper deals with the design, wind tunnel testing, and performance analysis of small wind turbines targeting low-power applications. Three different small-size blade designs in terms of size, shape, and twisting angle are considered and tested. We conduct wind tunnel tests while measuring the angular speed of the rotating blades, the generated voltage, and the current under varying resistive loading and air flow conditions. An electromechanical model is also used to predict the measured voltage and power and verify their consistency and repeatability. The measurements are found in qualitative agreement with those reported in previously-published experimental works. We present a novel methodology to estimate the mechanical torque applied to the wind turbine without the deployment of a torque measuring device. This method can be used to determine the power coefficient at a given air speed, which constitutes an important performance indicator of wind turbines. The wind tunnel tests revealed the capability of the developed wind turbines to deliver more than 1225 mW when subject to an air flow with a speed of 7 m/s. The power coefficient is found ranging between 26% and 32%. This demonstrates the aerodynamic capability of the designed blades to extract power from the wind.
양자키분배를 위한 단일광자 생성 및 APD 기반의 저잡음 검출
박준범(Jun-Bum Park),Bouzid Abdessattar,황성현(Sung-Hyen Hwang),임영근(Young-Geun Lim),문성욱(Sung Moon) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 논문에서는 1.5㎛ 파장대에서 감쇄기를 이용한 유사단 일광원을 이용하여 단일광자검출의 특성을 실험적으로 분석하였다. Gated Geiger 모드에서 APD를 동작 하여 열적 노이즈에 따른 양자효율을 측정하였다. 또한 APD를 이용하여 단일광자를 고속으로 검출시 문제가 되는 afterpulsing 노이즈의 온도별 특성을 분석하였다.
Robust Adaptive Controller for the Diesel Engine Air Path with Input Saturation
Samia Larguech,Sinda Aloui,Olivier Pagès,Ahmed El Hajjaji,Abdessattar Chaari 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.10
In this paper, we design an adaptive controller for the diesel engine air path with a priori consideration of actuator saturation effects to regulate the exhaust manifold pressure and the compressor flow rate. The originality of the proposed approach is the integration of an auxiliary system to compensate the saturation effects. Simulation results of the diesel engine air path are given to show the efficiency of the proposed approach.