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Visual Programming을 통한 System Simulation Modeling
김규하(Kyu Ha Kim),김명희(Myoung Hee Kim) 한국정보과학회 1991 한국정보과학회 학술발표논문집 Vol.18 No.2
본 연구에서는 Visual Programming을 통해 컴퓨터 시뮬레이션의 모델링 작업을 지원하는 System을 설계 및 구현하였다. 일반적인 시스템의 표현 도구는 확장된 페트리 네트를 사용하며 이를 이용해 가시적인 모델 명세(Graphical Model Representation)를 하고, 모델 표현시의 복잡도를 줄이기위해 Modular Structure를 제공한다. 가시적으로 표현된 모델은 Target Simulation Langauage로 자동 번역됨으로써 사용자의 경우, 표현되는 Graphical Element에 대한 화면상의 선택에 의해 프로그램된 시뮬레이션 모델을 얻을 수 있다.
김규하(Kyu-Ha Kim),양재봉(Bong-Jae Yang),황보동규(Dong-Gyu Hwang-Bo),신동윤(Dong-Yoon Shin),정기현(Ki-Hyun Jung) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.11
With the expansion of the online system, a payment system has been simplified and became popularized. In this paper, a new simple payment system is proposed and implemented to provide authentication and a low cost. The proposed system has a smart contract that is based on ethereum network.
김규하(Gyu-Ha Kim),조상구(Sang-Gu Cho),김완수(Wan-Soo Kim),이선규(Sun-Kyu Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This paper presents a PTP control method of a ball screw-driven stage with laser interferometer and DC servo motor. We use the switching control method that consisted of general PID control in the micro dynamic region and NCTF method in the other region. To determine a switching time, this method measure the driving force of the stage. The proposed control method enables the ball-screw driven stage with 100㎜ stroke to move with 0.6㎚ resolution that is the resolution of laser interferometer.
PI 관측기를 이용한 MDPS 시스템의 모델 기준 제어
김인혁(In Hyuk Kim),김규하(Kyu Ha Kim),정현희(Hyun Hee Jeong),서정훈(Jeong Hoon Seo) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
Various control performances such as assist torque generation, vibration suppression, providing road surface information, returnability, and damping are required in MDPS (Motor Driven Power Steering) system. For this reason, many kinds of control methods are being studied. This paper proposes a PI (Proportional Integral) observer based controller. The proposed controller consists of PI observer, MDPS reference model, and integral state feedback control including reaction force compensation. The PI observer is designed to estimate the state of the system, the driver’s torque, and the rack reaction force, and then, the reference model is designed to have the desired steering feel. The estimated driver torque is used for the reference model to generate the position command. The motor torque to actuate the MDPS system consists of rack reaction force compensation and position control. This paper shows the simulation results to describe the performance of the proposed control method.