불확실성 요소를 갖는 3D 크레인 시스템의 강인적응제어

鄭相鐵(Sang Chul Jeong),金東源(Dong Won Kim),曺賢哲(Hyun Cheol Cho),李炯基(Hyung Ki Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.1

This paper presents robust and adaptive control method for complicated three dimensional crane systems with uncertain effect. We consider an overhead crane system in which a trolly located on its top is moved to x- and y-axis independently. We first approximate the complicated crane model through linearization approach to simply construct a PD control and then design an adaptive control system for compensating modeling error and control deviation which is feasibly occurred due to system perturbation in practice. An adaptive control scheme is analytically derived using Lyapunov stability theory for a given bound of system perturbation. We accomplish numerical simulation for evaluation of the proposed control system and demonstrate its superiority comparing with the traditional control strategy.

염화철(Ⅲ)처리 활성탄을 이용한 수중의 질산성질소 제거

유찬서 ( Chan-seo You ),정승광 ( Seung-gwang Jeong ),정정조 ( Cheong-jo Cheong ),정상철 ( Sang-chul Jung ),이경동 ( Gyeog-dong Lee ),라덕관 ( Deog-gwan Ra ) 한국환경기술학회 2009 한국환경기술학회지 Vol.10 No.3

염화철(Ⅲ)처리 입상 활성탄을 제조하여 수중에 존재하는 질산성질소의 제거 방안에 대하여 검토하였다. 염화철처리 활성탄은 일반 활성탄에 비하여 표면에 피흡착질을 축적할 수 있는 수많은 세공들이 관찰되었다. 질산성질소 제거율은 염화철처리 활성탄 첨가량 20g/L에서 96.2%로 가장 높았고, pH변화에 따른 질산성질소 제거율은 큰 차이가 질산성질소 나타나지 않았다. 온도가 증가할수록 질산성질소의 제거율은 감소하는 경향을 나타냄으로써 반응이 발열반응임을 확인할 수 있었다. 제거를 위한 적정 온도는 10℃이었으며, 그때 제거율은 96.2%를 나타냈다. 흡착등온식은 Freundlich식이나 Langmuir식으로 표현이 가능하였다. In order to remove the resolved nitrate in natural water, this study was carried out to investigate the nitrate removal efficiency by using an Iron chloride(Ⅲ) treated activated carbon. The treated activated carbon could be observed a lot of porosity better than conventional activated carbon that showed an elevated capacity of pollutant accumulation on its surface. The highest nitrate removal efficiency was recorded to 96.2 % by adopting of 20 g/L the treated activated carbon. Though the removal efficiency was not affected by pH variation, it showed a tendency in inverse proportion to water temperature. So this process was known to be an exothermic reaction, and optimum temperature in order to get 96.2 % nitrate removal efficiency was concluded to be 10℃. Additionally, the nitrate adsorption reaction between nitrate and Iron chloride(Ⅲ) treated activated carbon was well able to followed to Langmuir and Freundlich adsorption isotherm.

주기적 확률외란을 갖는 DC 전동기의 적응형 상태궤한 제어시스템

鄭相鐵(Sang-Chul Jeong),金俊洙(Jun-Su Kim),曺賢哲(Hyun-Cheol Cho),李炯基(Hyung-Ki Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.6

Periodic disturbance is practically occurred in several engineering applications, especially in data storage systems. However, recently addressed controls for such problem were mostly dealt with its deterministic nature, which is rarely practical in real-time implementation. We present an adaptive control approach for DC motor systems with periodic stochastic disturbance whose frequency and magnitude are both random variables. We establish adaptive state feedback control which is linearly composed of nominal and corrective control parameter matrices. The former is derived from a nominal system model voiding disturbance and the latter is constructed from a disturbed system model by using Lyapunov stability theory. We carry out computer simulation to evaluate the proposed control methodology and compare to the recently addressed control method to demonstrate its superiority.

부식한 ZrO₂ 복합 세라믹스의 비커스 경도에 대한 와이블 통계 해석

정상철(Sang Cheol Jeong),남기우(Ki Woo Nam) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.4

명말 광주의 종족 -안준언 『맹수재존독』을 중심으로-

정상철 ( Jeong Sang Cheol ),정성일(역) ( Jeong Seong Il ) 중국사학회 2003 中國史硏究 Vol.27 No.-

北京圖書館藏有名崇禎五(1632) 年成書的判讀《盟水齊存讀》. 著者叫顔俊彦, 字開美, 호雪, 浙江桐鄕人. 崇禎元年考中進士后當了廣州府推官. 廣州府推官以理刑名, 贊計典爲職務. 本書是以崇禎元(1628)年到同四年的在任期間所撰判於及公??編輯的. 顔俊彦在廣李署之盟水齋中寫了本書序文. 廣州府治位置于廣州城內布政司西. 廣李署指的是廣州付治之內理刑名的官署. 廣州府治的中心是正堂, 正堂后邊有知府해, 東邊有請軍同知해, 經歷司, 西邊又有海防同知해, 督粮通判해, 捕盜通判해, 理刑推官해, 照磨所等. 廣李署可能就是理刑推官래, 這介해之內有盟水齋. 本書書名的意思是盟水齋保存的判독. 本書有二刻. 一刻是, 勘合不分卷, ??略5卷, 번案1卷, 署府번案1卷, 금審1卷, 公移1卷. 署府??案件的記錄. 這本書涉及的內容廣泛. 含有商業, 土地制度, 家庭, 宗族, 圖甲, 鄕約, 保甲, 鄕紳等方面的資料. 本稿的 看重点在于有關種族的記錄. 首先說明一下這本書對宗敎硏究具有즘樣的重要意義. 嘉靖六(1527)年刊 《廣州志》 卷三五 《禮樂》 談到士大夫之家開始修筑大宗, 小宗的祠堂. 照應當時廣州風俗的情況, 這介紀錄所揭示的事實是흔重要的. 在 《禮樂》出現的궤年前卽正德十六(1521)年 赴任廣東按察司副使的魏校在廣州成內, 周邊珠江三角洲地區, 以及其他廣東地區, 大規模地進行了??毁淫祠的行動. 但卽使是??毁了淫祠, 可要根絶民間信仰却不是件容易的事. 作爲여淫祠抗衝的手段, 魏校在推行祭祀祖先的同時, 還有效地利用取代淫祠而設立的里社, 社學及鄕約等. 來實行儒敎式的敎化. 《廣州志》的 《禮樂》 的 紀錄근這樣儒敎敎化有關系. 當時通過科擧進入官界的士大夫也對抗着民間信仰. 作爲普及儒敎的活動的一배企圖樹立以宗祠爲主的宗族體制. 《猛獸齋存讀》 收錄的是訴訟的例子, 指示讓我們看到了宗族活動的一介側面. 如果考慮到明代中期以後儒敎和民間信仰的對抗情況. 就會發現宗祠, 族長的存在??其重要這一事實, 同時本書幷非爲直接揭示宗子支持祖先祭祀的例子, 在族內共同祖先嫡長血統受重視的事實證明在明末時以宗祠爲主的宗族體制已經在廣州地區札了根.

시소러스 및 요약화일을 이용한 문서 검색시스템

정상철(Sangcheol Jeong),신동욱(Dongwook Shin) 한국정보과학회 언어공학연구회 1994 한국정보과학회 언어공학연구회 학술발표 논문집 Vol.1994 No.10

Lock in Amplifier 기법을 이용한 주기적 외란을 갖는 DC 전동기의 적응제어

정상철(Sang Chul Jeong),조현철(Hyun Cheol Cho),김준수(Jun Su Kim),안영주(Young-Joo An),이형기(Hyung Ki Lee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.7(초록집)

창원시 아파트 자산시장과 공간시장의 관련성에 관한 연구

정상철(Jeong, Sang Cheol),성주한(Sung, Joo Han) 한국부동산학회 2022 不動産學報 Vol.86 No.-

본 연구는 창원 주택가격의 급격한 변화를 나타내주는 구조적 변화를 통해 3개의 시기로 나누었고, 각각의 시기별 창원시 아파트 자산시장과 공간시장의 관련성에 어떠한 변화가 있는지를 살펴보고자 하였다. 연구결과의 요약으로는 다음과 같다. 2011년 1월~2015년 11월에는 자체변수인 아파트 매매가격 변화율보다 아파트 전세가격 변화율과 주택건설인허가변화율의 영향력이 더 큰 것으로 파악되었다. 2015년 12 월~2020년 2월에는 자체변수인 아파트 매매가격 변화율의 영향력이 가장 큰 것으로 파악되었고, 아파트전세가격 변화율이 그 다음으로 크며, 세 번째로 통화량의 영향력이 큰 것으로 파악되었다. 2020년 3 월~2021년 10월에는 자체변수인 아파트 매매가격 변화율의 영향력보다는 아파트 전세가격 변화율, 통화량변화율, 창원 주택건설인허가 변화율, 창원 미분양변화율의 순서로 영향력이 큰 것으로 파악되었다. 1. CONTENTS (1) RESEARCH OBJECTIVES The purpose of this study was to examine the changes in the relationship between the Changwon apartment asset market and the space market for each period. (2) RESEARCH METHOD This study employed VEC model to achieve the major objectives of this study. (3) RESEARCH FINDINGS The implication of this study is first, in the relationship between the apartment asset market and the space market in Changwon, the closeness between the apartment sale price, which is the asset market, and the apartment jeonse price, which is the space market, was found to be the highest. Therefore, in order to understand the asset market, it is necessary to first understand the apartment jeonse price in the space market. Second, the important factors affecting the apartment sale price in each period of structural change are that other important factors exist except for the apartment jeonse price. Therefore, it should be possible to predict the future by distinguishing the rising and falling periods of the asset market and identifying which factors have the greatest influence. 2. RESULTS A summary of the research results is as follows. From January 2011 to November 2015, it was found that the change rate of the apartment Jeonse price and the change rate of the housing construction permit had a greater influence than the rate of change in the apartment sale price, which is its own variable. From December 2015 to February 2020, the influence of the change rate of apartment sales price, which is its own variable, was found to have the greatest influence, followed by the rate of change of the apartment Jeonse price, and the third largest influence was the money supply. From March 2020 to October 2021, it was found that, rather than the influence of the change rate of apartment sale price, which is its own variable, the influence was greater in the order of the change rate of the apartment jeonse price, the change rate of the money supply, the change rate of the Changwon housing construction license, and the change rate of the unsold house in Changwon.

지역부동산시장의 개발동태와 가격메커니즘 분석 - 부산ㆍ경남을 중심으로 -

정상철(Jeong Sang Cheol),안상인(Ahn Sang In) 한국부동산학회 2004 不動産學報 Vol.23 No.-

1. CONTENTS (1) RESEARCH OBJECTIVES It is necessary to vitalize the special features and developmental dynamics of the regional real estate market by widening the scope of real estate research and analysis which was mainly focused in Seoul and the metropolitan area. Now a criterion must be provided for the synthetical achievement of a more comprehensive literature and research dealing with real estate. (2) RESEARCH METHOD First, in terms of the method of analysis, we will look into the fact that the Busan and Kyeong Nam areas have large scale areas for developmental dynamics. Also, statistics in land price, ratio of housing distribution, rising sale prices of apartments and others factors will be considered and we will analyse these statistics to see how they affect and influence the price of real estate. (3) RESEARCH RESULTS To revitalize the current stagnant real estate business and make the market mechanism smoother, instead of creating effective demands, we concluded that it was more effective to introduce tax reduction policies for the vitality of the real estate business. 2. RESULTS Instead of a temporary support system of the stagnant real estate business, it is necessary to provide a more efficient and long-term policy. In terms of supply and demand, it is proved that the tax reduction on the transaction of real estate have had the largest economic effect on the market. We are able to realize, through experience, that the reduction of real estate transaction tax was not only effective in vitalizing the real estate market but also provided a positive effect on both the national and regional economy. 3. KEY WORDS The alleviation of government regulations, Tax on real estate transactions, Laffer Effect

시변 영구자석형 동기 전동기의 적응형 카오스 제어

정상철,조현철,이형기,Jeong, Sang-Chul,Cho, Hyun-Cheol,Lee, Hyung-Ki 한국융합신호처리학회 2008 융합신호처리학회 논문지 (JISPS) Vol.9 No.1

전동기의 카오스 현상은 실시간 구현에 있어 바람직하지 않은 동특성으로서, 일반적으로 정상상태에서 전동기 속도가 진동을 한다든지 토크가 랜덤하게 변하는 특징이 있다. 본 논문은 카오스 현상을 갖는 영구자석형 동기 전동기의 적응제어기법을 제안한다. 전동기의 계수(parameter)는 어느 범위 안에서 랜덤하게 변화하는 시변특성을 갖는다. 제어기 설계는 우선, 전동기의 비선형 시스템 모델을 공칭 선형시스템 이론을 적용하여 선형화한다. 또한 실시간에서 시스템 계수의 변화로 인해 발생하는 제어오차를 보상하기 위한 보조제어기법을 제안하며 리아푸노브 안정성 이론을 적용하여 그 제어규칙을 산출한다. 컴퓨터 시뮬레이션을 통하여 제안한 제어기법의 타당성 및 신뢰성을 검증하며 기존의 제어기법과 비교 분석하여 성능의 우수성을 입증하였다. 또한 PSoC(Programmable System-on-Chip)기반 구동 드라이브를 포함하는 실시간 전동기의 제어시스템 실험을 통해 실제 적용가능성을 검증한다. Chaotic behavior in motor systems is undesired dynamics in real-time implementation since the speed is oscillated in a wide range and the torque is changed by a random manner. We present an adaptive control approach for time-varying permanent-magnet synchronous motors (PMSM) with chaotic phenomenon. We consider that its parameters are changed randomly within certain bounds. First, a nonlinear system model of a PMSM is transformed to derive a nominal linear control strategy. Then, an auxiliary control for compensating real-time control error occurred by system perturbation due to parameter change is designed by using Lyapunov stability theory. Numerical simulation is accomplished for evaluating its efficiency and reliability comparing with the traditional control method. Additionally, we test our control method in real-time motor experiment including a PSoC based drive system to demonstrate its practical applicability.