RCP 시스템에서 사용가능한 DMC (Dynamic Matrix Control) 블록의 개발과 응용

이영삼,유광명,Lee, Young-Sam,Yu, Kwang-Myung 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.9

In this paper, we present the implementation method of Dynamic Matrix Control(DMC) block for use with a Rapid Control Prototyping(RCP) system and consider the speed control of a DC motor using the developed DMC block. Firstly, we briefly introduce a lab-built RCP system. Secondly, we present a method for implementing a DMC block using C-language, which enables the DMC algorithm to be represented in a library block that can be used in a Simulink environment. Finally, we use the developed DMC block for the speed control of a DC motor, through which we show that the DMC-based control system can be easily implemented and applied to the real-time control of systems with relatively fast dynamics.

전자재료 심포지엄 : 게이트 라인 물질의 저항률에 따른 TFT - LCD 화소의 동작 특성

이영삼,정순신,윤영준,최종선 ( Young Sam Lee,Soon Shin Jung,Young Jun Yun,Jong Sun Choi ) 대한금속학회 1998 大韓金屬學會會報 Vol.11 No.5

사업장 화재 경보음 인지정도에 관한 연구

이영삼,이동호,Lee. Young-Sam,Rie. Dong-Ho 한국방재학회 2013 한국방재학회논문집 Vol.13 No.2

사업장 내에 존재하는 다양한 소음에 의해 피난에 많은 영향을 주고 있다. 특히 사업장에서 가동되는 각종 기계설비 및 유틸리티 설비의 기기음(암소음)에 의해 화재경보음 인지가 지연되어 사망률이 증가되고 있다. 또한 최근 들어 값비싼 토지 비용 때문에 고층의 아파트형 공장이 도심지 또는 대도시 근방에 많이 건립되고 있다. 이러한 아파트형 공장에서 화재가 발생 될 경우 인명피해는 더욱 늘 것으로 판단된다. 본 연구에서는 이러한 문제점을 분석하기 위해 실제 상황을 조장하여 경종의 형식 승인 및 검정기술기준 시험세칙(KOFEIS 0305)과 미국방화핸드북(Fire Protection Handbook)의 측정기준 및 예시기준에 따라 조건별로 실험하였다. 실험은 복도에 있는 경종을 소음측정기로 90dB 음량으로 세팅하고 실내에서 기기실로부터 녹취한 기기음을 스피커로 음(70dB, 80dB, 90dB)을 발생시켰다. 그리고 청력에 이상이 없는 20대초 연령의 피험자를 대상으로 거리별, 출입문의 개 폐 조건별, 기계음 종류별, 방음보호구 착용여부 조건에 따른 경보음 인지정도 측정 및 분석을 하였다. 실험결과 기기실 문을 닫고 방음보호구를 착용 시 대부분의 피험자가 화재경보음을 인지하지 못하였다. 미국방화협회(NFPA)에서는 암소음이 85dB이거나 이상일 경우 다른 경보방법을 강구하도록 되어있다. 따라서 기기음과 장소의 특성을 고려하지 않는 일률적인 화재경보음의 설계에 대한 제도적 및 법적개선이 요구되는 결론을 도출하였다. Most work places operating machines have a lot of background noise that affect evacuation from a factory. Especially, a lot of background noise from utility machines cause delay of awareness of fire alarm sound and also increase death rate. Currently, skyscraper type factories have been constructed at around big cities because of high land price. The complexity of skyscraper type factories leads to increase death rate on fire.This study was to research problems using experiment as the same workplace situation according to KOFEIS 0305 and the US Fire Protection Handbook. The experiment was conducted using the speakers to produce machine sound(70dB, 80dB, 90dB) in the room. The fire alarm sound was produced from a corridor. Also the experiment was done using persons(around 20 years old and without damage of ears) under different conditions such as distance from the alarm system, open and closed doors, machine sounds, and with and without ear protection. As a result of the measurements, it showed that in the case of wearing ear protection, most people could not hear fire alarm sound in the room with closed door. NFPA suggests that the alarm system should be considered of other methods to know alarm sound when the background noise exceeds 85dB or more. Therefore it was concluded that the design of the fire alarm systems should not be applied to the workplace without considering background noise and that there needs to be improvement with regulations and the systems.

기울기가 일정한 코드를 사용한 개선된 PDP용 subfield 기법

이영삼,김린철,이병욱,Lee, Young-Sam,Kim, Rin-Chul,Lee, Byung-Uk 대한전자공학회 2002 電子工學會論文誌-SP (Signal processing) Vol.39 No.5

본 논문에서는 plasma display panel에서 동영상을 표현할 때 발생할 수 있는 dynamic false contour (DFC) 등의 화질 열화를 개선할 수 있는 subfield 기법에 관하여 고찰한다. 인접한 subfield 들간의 시간 길이 차이로 인하여 DFC가 발생한다는 사실을 파악하고, 그 차이를 일정하게 유지하는 기울기가 일정한 code를 제안한다. 그리고, 에러의 첨두치와 지속 시간의 trade-off 관계를 고려하여 에러의 절대값의 평균을 최소화 할 수 있도록 상이한 시간 길이를 갖는 subfield들을 배열한 code를 제안한다. 제안한 subfield 기법은 계조값에 비례하여 에러의 크기가 증가하는 것을 보임으로써 인간의 시각적 특성 관점에서도 적합한 방법임을 입증하였다. This paper presents a new subfield method that can alleviate the visual artifact called the dynamic false contour (DFC), which occurs on plasma display panels. Nothing that the DFC is caused by the difference of time intervals between the adjacent subfields, we propose a constant slope code, in which the differences are maintained to be constant. Also, we propose a subfield code that can minimize the mean absolute error, considering the trade-off between the peak magnitude of the error and its duration. We will show that the proposed subfield method maintains an adequate performance in the view point of the human visual system, since the bound of the errors increases with the gray scale.

예측제어의 마이크로콘트롤러 구현을 위한 QP 해법과 그 적용방법

이영삼(Young-Sam Lee),경기영(Gi-Young Gyeong),박재헌(Jae-Heon Park) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.9

In this paper, we propose a method by which QP (Quadratic Programming) problems can be solved in realtime so that we can implement the predictive control algorithm on a microcontroller system. Firstly, we derive a solution to QP problems by converting the original QP problems to its equivalent least squares with inequalities. Secondly, we propose a predictive control algorithm that can give good realtime computation performance by utilizing the fact that some parameters needed for solving QP problems can be computed offline. Finally, we illustrate that the proposed method can give good realtime features by running the C-code application constructed using the proposed method on a microncontroller system.

논 문 : 상업용 부동산의 경매 참여자별 의사결정특성

이영삼 ( Young Sam Lee ),최민섭 ( Min Seub Choi ) 한국감정평가학회 2013 감정평가학논집 Vol.12 No.1

본 연구는 부동산 경매시장에서 상업용 부동산의 중요성과 비중이 높아지고 있음에도 불구하고, 경매 참여자들이 상업용 부동산에 대하여 참고할 만한 자료와 기준이 미미한 실정임을 인식하고, 앞으로 상업용 부동산 경매시장에서 입찰 참여자들이 입찰 의사결정을 하는데 있어 합리적이고 객관적인 판단과 평가를 할 수 있는 기준을 제시하는데 목적이 있다. 이를 위하여 AHP기법을 활용하여 60명의 전문가 집단을 대상으로 전문가 설문조사를 실시한 후 32명의 유효표본에 대하여 상업용 부동산의 입찰 참여 의사결정요인의 중요도와 영향값을 분석하였고, 표본의 특성에 따른 성별, 직업별 및 입찰목적에 따른 비교분석을 실시하였다. 본 연구는 상업용 부동산 경매에 대한 의사결정특성의 중요도 및 영향 값을 논리적이고 객관적으로 정리한 점과 주거용 부동산과 관련한 선행연구의 중요요인과 본 연구에서 밝혀낸 상업용 부동산의 중요요인이 다르다는 것을 입증한 점에 의의가 있으며, 향후 상업용 부동산 입찰 의사결정의 기준으로 활용되어 부동산 경매시장 안정에 기여할 수 있기를 기대한다. The purpose of this study is to explore the decision making characteristics of real estate bidding participants in Commercial Properties. This study attempted to elicit the reasonable decision making model at the time of bidding on commercial properties auction market that is difficult to choose reasonable by relationship of various rights and duties. Moreover, this study attempted to conduct the analysis using the general statistical processing method based on the demographical data obtained from the questionnaire research on the basis of the understanding that the identity of the specialist is ambiguous when AHP is used under the special situation of commercial properties auction. And it attempted to analyze the cross-tabs of demographical characteristics by professional group to make an in-depth understanding of the specific contents. Finally, This study was made to find out the degree of importance through the case revealed that the bidders at commercial properties auction. The results of the study are as follows ; First, it was found that characteristic factor of the real estate is most important among the decision making factor Second, it is important to decide the scale of equity preferentially for a reasonable investment decisions. Last, commercial properties are important to analyze relationship of rights and duties to be acquired.

마이크로캡슐을 활용한 분전반 소화용구 개발에 관한 연구

이영삼(Young-Sam Lee),백수호(Soo-Ho Baek) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.7

대한민국 소방청 화재통계자료(2015~19년)를 원인별로 분석해보면, 전기로 인한 화재가 47,135건, 기계적 원인에 의한 화재가 22,852건, 가스누출에 의한 화재가 871건순으로 나타났다. 그래서 주요 화재의 원인이 전기화재로 나타났다. 따라서 본 연구에서는 전기화재 중 소화설비의 적용 및 시공이 어려운 분전반 등의 소공간 화재를 대상으로 마이크로캡슐 소화약제의 KFI기준 충족 유·무 및 제품을 제작 후 현장에 적용하여 화재 적응성을 3회 실험하였다. 실험결과, 화재접촉 이후 캡슐 안에 있던 소화약제가 방사되어 평균 4.48초에 노르말헵탄(n-heptane)의 화재가 진압되었다. 따라서 한국소방산업기술원(KFI) 소공간 B급 소화시험의 “예비연소 종료 후 90초 이내에 소화되고 재발화 되지 아니할 것” 기준을 충족하였다. 그리고 용도별로 제품을 제작한 소화용구를 현장에 적용하여 실험한 결과, 제품에 화염접속 후 평균 1.87초에 토치의 연소화염이 소화되었다. 또한 본 소화용구는 기존 실린더 타입의 부피 문제점을 획기적으로 개선하였다. 하지만 본 소화약제 및 용구에 대한 국가화재안전기준(NFSC) 등이 없는 실정이다. 그러므로 소방청 및 소방관련 전문기관에서는 본 소화약제 및 제품에 대한 검증을 통하여 성능검증기준, 형식승인기준, 현장적용기준 등의 제정에 대해 검토가 필요하다고 판단된다. According to an analysis of the fire statistics of the nation"s fire department (2015~19), 47,135 fires were caused by electricity, 22,852 by mechanical causes, and 871 by gas leakage. Hence, the most common cause of fires is electric fire. Therefore, in this study, the fire adaptability of microencapsulated fire extinguishing agents was tested by applying the KFI to determine agent performance and field application against small space fires, such as electric distribution boards in which fire extinguishing equipment is difficult to apply and construct. Tests showed that the fire extinguishing agent inside the capsule was released after fire contact, and an n-heptane fire was extinguished within 4.48 seconds on average. Therefore, the KFI small space B-level fire-extinguishing test by the Korea Institute of Fire and Industry met the criteria that the fire was extinguished and did not reoccur within 90 seconds after the end of preliminary combustion. In addition, after experimenting with the field application of the product for each purpose, the burning flame of the torch was extinguished within 1.87 seconds on average. This fire extinguisher (agent) dramatically improved the volume problem of existing cylinder-type fire extinguishers for small spaces. On the other hand, there is no National Fire Safety Code (NFSC) for this agent and extinguisher. Therefore, it is necessary to enact standards for field application. Furthermore, the National Fire Agency and fire-related specialized agencies need to review the enactment of performance verification standards, type approval standards, and field application standards by verifying the fire extinguishing agent and products.

TFT-LCD 화소 설계 도구 (PDAST)의 개발과 응용

李泳三(Young-Sam Lee),郭志勳(Ji-Hun Kwak),崔淙宣(Jong-Sun Choi) 대한전기학회 1999 전기학회논문지C Vol.48 No.6

Matlab과 USB DAQ 장치를 이용한 Rapid Control Prototyping System 개발

이영삼(Young-Sam Lee),양지혁(Ji-Hyuk Yang),김석윤(Seuk-Yun Kim),김원식(Won-Sik Kim),권오규(Oh-Kyu Kwon) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.10

In this paper, we propose a new and cost-effective RCP (Rapid Control Prototyping) system based on Matlab/Simulink and a DAQ (Data Acquisition) unit with the high speed USB communication interface. The proposed RCP system has a feature that a computer on which Simulink is running acts as a realtime controller and a DAQ unit performs data acquisition, transmission of the data to and from a computer, and the application of control data received from the computer. For its implementation, we develop 10 communication blocks each of which is constructed by using S-function. In order to increase the data communication speed and thus to reduce the sampling period of the overall control system, we propose to use a batch transfer strategy through the USB interface. The proposed RCP system has several advantages over existing methods such as good maintainability, portability due to the USB interface, low cost, and no necessity for C-code generation even though it can only be applied to control systems with moderate sampling rates. It is expected that the proposed RCP system can be useful in teaching control-related topics to undergraduate and graduate students.

제어시스템 강좌의 온라인 수업 효율향상을 위한 교육환경 개발

이영삼(Young Sam Lee),주도윤(Doyoon Ju),최창규(Changkyu Choi) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.12

In recent years, lectures on control systems have focused on hands-on experience using actual control equipment than before. However, the online education triggered compulsorily by the Covid-19 pandemic poses has restricted the construction of an education environment for hands-on experience. In this study, we proposed an economical and compact experimental environment for control education that enables hands-on experience even through online education. To this end, we utilized a light weight rapid control prototyping (LW-RCP), which is a lab-built RCP environment, and the environment was constructed using 3D printing. In the proposed environment, LW-RCP enabled students to focus on the learning and application of related control concepts, without the inconvenience of manual C-coding and the possibility of debugging errors. In addition, the proposed control equipment, which was manufactured using 3D printing, is an inexpensive equipment with a sufficiently small size that can be placed on a desk. Owing to the low cost and small size of the proposed environment, each student can have his/her own experimental equipment, which will enable a hands-on experience even through online education. Online education is expected to expand more and more in the future as it exhibits various advantages and potentials from traditional face-to-face classes. The proposed educational environment is expected to play a meaningful role in satisfying the demands of hands-on experience for control-related lectures.