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슬라이딩 모드를 이용한 다관절 매니퓰레이터의 다입력 실시간 제어에 관한 연구
이민철(Min Cheol Lee) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
This paper presents to accomplish successfully a multi-input real time control by applying control hierarchy for sliding mode of multi-joint manipulators whose nonlinear terms are regarded as disturbances. We could simplify the dynamic equations of a manipulator and servo system, which are composed of linear elements and nonlinear elements, by assuming that nonlinear terms, which are inertia term, gravity force term, Coriolis force term and centrifugal force term, are external disturbance. By simplifying that equation, we could easily obtain a control input which satisfy sliding mode of multi-input system. We proposed a new control input algorithm in order to decrease chattering by changing control input according as effect of disturbance if a control response become within allowance error range. In this experiments, we used DSP(Digital Signal Processor) controller to suppress chattering by time delay of calculation and to carry out real time control.
형상정보가 없는 공종의 속성정보모델링 기법 개발에 관한 연구
이민철(Lee, Min-Cheol),이상진(Lee, Sang-Jin),옥종호(Ock, Jong-Ho) (사)한국CDE학회 2011 한국CDE학회 논문집 Vol.16 No.2
Construction industries worldwide have moved to Building Information Modeling environment in conjunction with IT technology progress. Korean domestic construction market is in the midst of enthusiastically adopting BIM technique and the public sectors try to apply the method to their projects. Difficulties have been introduced, however, in doing so mainly due to the complexity in reflecting the distinctions of the public cost estimate requirements to BIM modeling. The main objective of this study is to propose four kinds of BIM property information modeling methodologies which would be used in the quantity surveys of the public construction projects. To evaluate the applicability of the suggested modeling methods, the research performed a case study.
게이트 산화막 가장자리에 Air-cavity를 가지는 새로운 구조의 다결정 실리콘 박막 트랜지스터
이민철,정상훈,송인혁,한민구,Lee, Min-Cheol,Jung, Sang-Hoon,Song, In-Hyuk,Han, Min-Koo 대한전기학회 2001 전기학회논문지C Vol.51 No.3
We have proposed and fabricated a new poly-Si TFT employing air-cavities at the edges of gate oxide in order to reduce the vertical electric field induced near the drain due to low dielectric constant of air. Air-cavity has been successfully fabricated by employing the wet etching of gate oxide and APCVD (Atmospheric pressure chemical vapor deposition) oxide deposition. Our experimental results show that the leakage current of the proposed TFT is considerably reduced by the factor of 10 and threshold voltage shift under high gate bias is also reduced because the carrier injection into gate insulator over the drain depletion region is suppressed.
이민철(Min Cheol Lee),박일광(IL Kwang Park) 대한산업공학회 2017 대한산업공학회 춘계학술대회논문집 Vol.2017 No.4
As part of the defense innovation policy, the policy to expand commercialization of military products is a procurement innovation policy designed to reduce defense budget and improve military convenience by replacing existing defense standard products with equivalent or superior products. This paper examines the procurement performance of commutated munitions from 2012 to 2016, and analyzes the procurement performance of the munitions commercialization innovation policy.
KAAS 차량 시뮬레이터의 워시아웃 알고리즘 감성 평가
이민철(Min Cheol Lee),김문식(Moon Sik Kim),김경달(Kyoung Dal Kim),문영근(Young Ceun Moon) 한국자동차공학회 2006 한국자동차공학회 Symposium Vol.- No.-
A vehicle driving simulator is a virtual reality device which makes a man feel as if he drove an actual vehicle. Unlike actual vehicles, the simulator has limited kinematic workspace and bounded dynamic characteristics. So it is difficult to simulate dynamic motions of a multi-body vehicle model. In order to overcome these problems, a washout algorithm which controls the workspace of the simulator within the kinematic limitation is needed. However, a classical washout algorithm contains several problems such as generation of wrong sensation of motions by filters in tilt coordination, requirement of trial and error method in selecting the proper cut-off frequencies, difficulty in returning the simulator to its origin using only high pass filters and etc. This paper proposes new tilt coordination method as an algorithm which gives more accurate sensations to drivers. To reduce time in returning the simulator to its origin, an algorithm that applies selectively onset mode from high pass filters and return mode from error functions is proposed. As a result of this study, the results of the proposed algorithm are compared with the results of classical washout algorithm through the human perception models. Also, the performance of the suggested algorithm is evaluated by using human perception and sensibility of some drivers through experiments. Put Abstract here. Put Abstract here. Put Abstract here. Put Abstract here. Put Abstract here. Put Abstract here.
생맥산 및 평위산 추출물의 위장관 운동 조절 효능에 관한 연구
이민철 ( Min Cheol Lee ),박진령 ( Jin Ryeong Park ),심지환 ( Ji Hwan Shim ),안태석 ( Tae Seok Ahn ),김병주 ( Byung Joo Kim ) 한방비만학회 2015 한방비만학회지 Vol.15 No.2
Objectives: The purpose of this study was to investigate the effects of Shengmai-san and Pyungwi-san, a herbal product used in traditional Chinese medicine, on gastrointestinal (GI) motility in mice. Methods: The in vivo effects of Shengmai-san and Pyungwi-san on GI motility were investigated by measuring the intestinal transit rates (ITRs) using Evans blue in normal mice and in mice with experimentally induced GI motility dysfunction (GMD). GMD was induced by injecting acetic acid or streptozotocin intraperitoneally. Results: In normal Institute of Cancer Research mice, ITRs were significantly and dosedependentlyincreased by Shengmaisan (0.01∼1 g/kg) and Pyungwi-san (0.01∼1 g/kg). The ITRs of acetic acid induced peritoneal irritation model and streptozotocin-induced diabetic model mice were significantly reduced compared to normal mice, and these reductions were significantly and dose-dependently inhibited by Shengmai-san (0.01∼1g/kg) and Pyungwi-san (0.01∼1g/kg). Conclusions: These results suggest that both Shengmai-san and Pyungwi-san are a good candidate for the development of a prokinetic agent that may prevent or alleviate GMD.