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Feedback Control for Expanding Range and Improving Lineraity of Microaccelerometers
박용화,박상준,최병두,고형호,송태용,임근원,허건수,박장현,조동일,Park, Yong-Hwa,Park, Sang-Jun,Choi, Byung-Doo,Ko, Hyoung-Ho,Song, Tae-Yong,Lim, Genu-Won,Huh, Kun-Soo,Park, Jahng-Hyon,Cho, Dong-il Institute of Control 2004 제어·로봇·시스템학회 논문지 Vol.10 No.11
This paer presents a feedback-controlled, MEMS-fabricated microaccelerometer($\mu$XL). The $\mu$XL has received much commercial attraction, but its performance is generally limited. To improve the open-loop performance, a feedback controller is designed and experimentally evaluated. The feedback controller is applied to the x/y-axis $\mu$XL fabricated by sacrificial bulk micromachining(SBM) process. Even though the resolution of the closed-loop system is slightly worse than open-loop system, the bandwidth, linearity, and bias stability are stability are significantly improved. The noise equivalent resolution of open-loop system is 0.615 mg and that of closed-loop system is 0.864 mg. The bandwidths of open-loop and closed-loop system are over 100Hz. The input range, non-linearity and bias stability are improved from $\pm10\;g\;to\;\pm18g$, from 11.1%FSO to 0.86%FSO, and from 0.221 mg to 0.128 mg by feedback control, respectively.
인지-반응모델을 이용한 공항터미날 시설별 운영기준의 측정
박용화(Yong Hwa Park) 대한교통학회 1995 대한교통학회 학술대회지 Vol.27 No.-
이 글에서는 공항 여객터미날에 대한 계획 및 운영관리의 실행기준을 인지-반응 모델을 이용하여 결정하는 방법을 논의 하고자 한다. 제시된 접근방법은 도식적으로 정의될 수 있으며 이는 공항 여객터미날의 각 시설물에서 실행된 서비스의 폭을 승객의 입장에 따라 결정·분류하는 방법이다. 이것은 새로운 개념으로서 공항시스템의 특성을 고려하여 이용승객에 대한 직접적인 조사를 통해 각 시설별 수용능력 및 서비스 수준을 가늠할 수 있도록 도와준다. 이 접근방법에서는 이용자들의 서버스 기대치와 실질적인 서비스 제공에 따른 인식과의 차이를 통해 기준을 설정하는 것으로서 공항 계획자, 디자이너, 운영자 그리고 공항관리자들에게 실질적이고 용이한 기법으로 제공될 수 있다. A methodology to the operation standards of the service performance of airport terminal facilities using Perception-Response Model is discussed in this paper. The proposed approach has defined as the graphical presentation of the collective attitudes of a category of passengers towards the range of operational service at a facility of airport terminal. It adopts new concepts to establish service standards through special survey, that can achieve better interpretation of capadty and level of service at each facility. It is expressed in terms of perception of the passenger population of different amounts of the service measure and their response to the respective service conditions classified into distinct levels of satisfaction with service. The methodology can provide a practical service standards of airport terminals and may prove to be a practical and convenient technique to airport planners, designers, consultants, operators, and to airport managers.
박용화(Yong-Hwa Park) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Pursuing smart machines that recognize humans intend and event autonomously, we focus on the study of interactions between human and machines in mechanical, optical and electrical ways. This study includes researches on three-dimensional scene and event recognition for autonomous vehicle and robots (vision), voice recognition and highdynamic range directional sound transducers (sound), and biometric sensors for monitoring of health condition by means of vibration and ultrasound transducers (touch). 3D scene recognition is a key technology toward commercialization of autonomous vehicle and smart robots. By means of this groups novel signal processing methodology combined with microsystems/ultrasound devices, high-definition, environmentally robust 3D scene recognition is enabled. This will provide accurate 3D recognition performance with compact, low-cost solution. The technical aspect of operating principle in view of mechanical signal processing will be highlighted and presented.