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Enhanced performance of inverted polymer solar cells by introducing buffer layer surface treatment
유준영,한용운,이의진,문두경 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Polymer solar cells (PSCs) are attractive method for photovoltaic applications because of their solution processibility, light weight, and mechanical flexibility. Inverted PSCs (i-PSCs) by employing metal oxide as buffer layer and high work fuction metal electrode have been proposed to improve long-term stability. But one of the main disadvatages of i-PSCs is charge carrier trap center that be occurred by surface defect of buffer layer such as oxygen dangling bond. Besides, different surface energy between buffer layer and active layer has a bad influence on interfacial contact. In this study, we fabricated i-PSCs with or without surface treatment onto buffer layer via solution process. Trap center and surface energy difference between buffer layer and active layer were reduced. As a result, the photovoltaic performance of i-PSCs with surface modification was enhanced.
Sliding Mode Control for an Electric Power Steering System in an Autonomous Lane Keeping System
유준영,김원희,손영섭,정정주,Yu, Jun Young,Kim, Wonhee,Son, Young Seop,Chung, Chung Choo Institute of Control 2015 제어·로봇·시스템학회 논문지 Vol.21 No.2
In this paper, we develop a sliding mode control for steering wheel angle control based on torque overlay in order to resolve the problem of previous methods for Electric Power Steering (EPS) systems in the Lane Keeping System (LKS) of autonomous vehicles. For the controller design, we propose a 2nd order model of the electric power steering system in an autonomous LKS. The desired state model is designed to prevent a rapid change of the steering wheel angle. The sliding mode steering wheel angle controller is developed for the robustness of the disturbance. Since the proposed method is designed based on torque overlay, torque integration with basic functions of the EPS system for the steering wheel angle control is available for the driver's convenience. The performance of the proposed method was validated via experiments.
이동체 탐지를 위한 동기화 구조의 7~9 GHz CMOS UWB 레이다 송수신기
유준영,박병규,김상균,정승환,어윤성 한국전자파학회 2019 한국전자파학회논문지 Vol.30 No.11
In this paper, a fully integrated 7~9 GHz UWB radar sensor to detect moving targets is presented using the 0.13μm CMOS technology. For achieving a high resolution and long detection range, a receiver using the equivalent time sampling method and a mixer with reference LO are adopted. Furthermore, a carrier-based transmitter can be used to digitally tune the center frequency and bandwidth. The expected target detection range is up to 5.7 m. The chip size is 2.8×2 mm2, and the power consumption is 96 mW at 1.2 V supply voltage.